Zhenjiang, China
Zhenjiang, China

Jiangsu University is a provincial university located in Zhenjiang, Jiangsu province, People's Republic of China . Wikipedia.

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Provided is a laser shock peening method for obtaining a large-area uniform surface morphology. Using the relationship between the thickness of an absorption layer and a plastic deformation due to the laser shock peening and using a grid-shaped absorption layer (5) having a staggered distribution in thickness in cooperation with a two-layer interlaced laser shock processing method significantly reduce the height difference between micro-protrusions (10) and micro-pits (12) produced by an impact of a square light spot, and effectively reduce the roughness of the workpiece surface such that a large-area uniform surface morphology is formed on the workpiece surface.

Jiangsu University | Date: 2015-04-28

A microstructured optical fiber has periodically arranged high-index rods embedded in a low-index background, a high-index ring surrounding the high-index rods, and a high-index core located at the center. The high-index rods and the low-index background forms a microstructured cladding region which supports the guidance of supermodes. The fundamental and the highest supermodes form a cladding-mode band, wherein at least the effective index of a core mode lies in the cladding-mode band. Also provided is a technique for selectively filtering the fiber modes, to selectively filter out one or some of the high-order modes with the other modes still guided in the core with low loss. The cascade of optical fibers can filter out a group of fiber modes, marking guidance of a single high-order mode in a few-mode optical fiber possible.

Zhu H.,Huaiyin Institute of Technology | Yao H.,Jiangsu University
Nonlinear Dynamics | Year: 2012

In this paper, a new three-dimensional autonomous chaotic system is presented. There are three control parameters and three different nonlinear terms in the governed equations. Basic dynamic properties of the new system are investigated via theoretical analysis and numerical simulation. The nonlinear characteristic of the new three-dimensional autonomous system versus the control parameters is illustrated by bifurcation diagram, Lyapunov-exponent spectrum, phase portraits, etc. © 2011 Springer Science+Business Media B.V.

Di Y.-M.,Jiangsu University | Wei H.-R.,Jiangsu University | Wei H.-R.,Beijing Normal University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We propose the generalized controlled X (gcx) gate as the two-qudit elementary gate, and based on Cartan decomposition, we also give the one-qudit elementary gates. Then we discuss the physical implementation of these elementary gates and show that it is feasible with current technology. With these elementary gates many important qudit quantum gates can be synthesized conveniently. We provide efficient methods for the synthesis of various kinds of controlled qudit gates and greatly simplify the synthesis of existing generic multi-valued quantum circuits. Moreover, we generalize the quantum Shannon decomposition (QSD), the most powerful technique for the synthesis of generic qubit circuits, to the qudit case. A comparison of ququart (d=4) circuits and qubit circuits reveals that using ququart circuits may have an advantage over the qubit circuits in the synthesis of quantum circuits. © 2013 American Physical Society.

Long X.,Jiangsu University | Oh K.,Chungnam National University | Cheng G.,Peking University
Journal of Cleaner Production | Year: 2013

This paper investigates the effects of environmental policy on environmental conditions resulting from China's accession to the WTO. We estimate environmental technological efficiency under both weak and strong disposability assumptions and use the difference to calculate the pollution abatement cost (PAC). We then undertake Tobit regression analysis on several explanatory variables, including dummies for different time periods and regions. Generally, our findings show that China's accession to the WTO did not guarantee better environmental conditions even though China adopted stronger regulations to meet the higher standards. In particular, the eastern region does not seem to be strictly regulated. These interesting results may be partly attributable to China's need to attract foreign investment and may represent a case in which institutional regulations are not always effective in practice. © 2012 Elsevier Ltd. All rights reserved.

Zhang J.,University of Swansea | Wang C.,University of Swansea | Wang C.,Jiangsu University | Chowdhury R.,Indian Institute of Technology Roorkee | Adhikari S.,University of Swansea
Scripta Materialia | Year: 2013

The piezoelectric constant e33 is calculated using molecular dynamic simulations for square gallium nitride (GaN) nanowires (NWs). Its magnitude is found to decrease significantly with increasing cross-section and temperature. An attempt is made to understand the physics behind the size- and temperature dependence of e33. Specifically, a constant surface piezoelectric coefficient e33s=0.52×10-9C/m is achieved for square GaN NWs independent of the geometric size of their cross-sections.

Song Y.F.,Nanyang Technological University | Li L.,Nanyang Technological University | Zhang H.,National University of Singapore | Shen D.Y.,Jiangsu University | And 3 more authors.
Optics Express | Year: 2013

We experimentally investigated the vector multi-soliton operation and vector soliton interaction in an erbium doped fiber laser passively mode locked by atomic layer graphene. It is found that the vector multi-soliton operation exhibited several characteristic modes. These are the random static distribution of vector solitons, stable bunches of vector solitons, restless oscillations of vector solitons, rain of vector solitons, and emission of a so-called giant vector soliton. The formation mechanisms of the operation modes were also experimentally investigated. © 2013 Optical Society of America.

Zhang H.,Jiangsu University | Georgescu P.,Technical University Gheorghe Asachi
Mathematical Methods in the Applied Sciences | Year: 2014

This paper deals with the dynamics of a class of hybrid dynamical systems, which are subject to time-dependent impulsive perturbations within a finite-time interval and describe control strategies for integrated pest management. By using suitably defined Lyapunov functionals, sufficient conditions for the finite-time contractive stability of the null solution are found by means of monotonicity arguments. Finally, a numerical simulation illustrates the theoretical analysis. © 2014 John Wiley & Sons, Ltd.

Cai S.,Jiangsu University | Zhou P.,Jiangsu University | Liu Z.,Shanghai University
Nonlinear Dynamics | Year: 2014

In this paper, the effect of impulses on the synchronization of a class of general delayed dynamical networks is analyzed. The network topology is assumed to be directed and weakly connected with a spanning tree. Two types of impulses occurred in the states of nodes are considered: (i) synchronizing impulses meaning that they can enhance the synchronization of dynamical networks; and (ii) desynchronizing impulses defined as the impulsive effects can suppress the synchronization of dynamical networks. For each type of impulses, some novel and less conservative globally exponential synchronization criteria are derived by using the concept of average impulsive interval and the comparison principle. It is shown that the derived criteria are closely related with impulse strengths, average impulsive interval, and topology structure of the networks. The obtained results not only can provide an effective impulsive control strategy to synchronize an arbitrary given delayed dynamical network even if the original network may be asynchronous itself but also indicate that under which impulsive perturbations globally exponential synchronization of the underlying delayed dynamical networks can be preserved. Numerical simulations are finally given to demonstrate the effectiveness of the theoretical results. © 2014 Springer Science+Business Media Dordrecht.

Huang L.,Jiangsu University | Huang L.,Jiangxi Agricultural University | Zhao J.,Jiangxi Agricultural University | Chen Q.,Jiangxi Agricultural University | Zhang Y.,Jiangxi Agricultural University
Food Chemistry | Year: 2014

Total volatile basic nitrogen (TVB-N) content is an important reference index for evaluating pork freshness. This paper attempted to measure TVB-N content in pork meat using integrating near infrared spectroscopy (NIRS), computer vision (CV), and electronic nose (E-nose) techniques. In the experiment, 90 pork samples with different freshness were collected for data acquisition by three different techniques, respectively. Then, the individual characteristic variables were extracted from each sensor. Next, principal component analysis (PCA) was used to achieve data fusion based on these characteristic variables from 3 different sensors data. Back-propagation artificial neural network (BP-ANN) was used to construct the model for TVB-N content prediction, and the top principal components (PCs) were extracted as the input of model. The result of the model was achieved as follows: the root mean square error of prediction (RMSEP) = 2.73 mg/100 g and the determination coefficient (Rp2)=0.9527 in the prediction set. Compared with single technique, integrating three techniques, in this paper, has its own superiority. This work demonstrates that it has the potential in nondestructive detection of TVB-N content in pork meat using integrating NIRS, CV and E-nose, and data fusion from multi-technique could significantly improve TVB-N prediction performance. © 2013 Published by Elsevier Ltd.

Fu W.,Jiangsu University | Li P.,Nanjing Forestry University | Wu Y.,Jiangsu University
Scientia Horticulturae | Year: 2012

The worldwide demand for Romaine lettuce (Lactuca sativa L.) is increasing. Regulation measures of supplementary or shading light are often used in the production of lettuce in some regions. However, inconsistent results on light saturation point of lettuce from previous studies did not facilitate the regulation of light intensity. In the present study, the effects of different light intensities on chlorophyll fluorescence characteristics and yield in lettuce were investigated. The results show that in the 100 and 800μmolm -2s -1 treatments, the values of qP, ΦPSII, and ETR were low, resulting in low light use efficiency and plant yield in lettuce. In the 200, 400, and 600μmolm -2s -1 treatments, the values of qP, ΦPSII, and ETR were high, resulting in high light use efficiency and plant yield in lettuce. Light-use efficiency in the 200μmolm -2s -1 treatment was the highest, whereas plant yield in the 600μmolm -2s -1 treatment was the highest. No significant difference in plant yield was observed between the 400 and 600μmolm -2s -1 treatment. In addition, judging by the values of F v/F m, the lettuce samples were under rather serious stress in the 800μmolm -2s -1 treatment, whereas they were under mild stress in the 600μmolm -2s -1 treatment. Based on these results, an optimal regulation strategy of light intensity that can maximize economic benefits for lettuce growers in some regions of the world is proposed. That is the range of 400-600μmolm -2s -1 is a recommendable light intensity for production of certain types of lettuce, and light intensity of 400μmolm -2s -1 can be an optimal value of supplementary light for winter greenhouse production of certain types of lettuce in higher latitudes, while light intensity of 600μmolm -2s -1 can be an optimal value of shading light for late spring and early autumn production of certain types of lettuce in lower latitudes. © 2011 Elsevier B.V.

Yang X.,Jiangsu University | Guo X.,Jiangsu University | Yu S.,Beijing Normal University
Computer Assisted Language Learning | Year: 2016

Translation instruction is very important in specialized English teaching activities. The effectiveness of current specialized English translation instruction (SETI) in mainland China, however, is unclear because university students have become less interested in, and less confident when doing, English translation. This study investigated the effects of online cooperative translation on EFL students’ levels of interest and self-efficacy with respect to specialized English translation through a questionnaire, focus group interview, interaction data analysis, and pre-test and post-test on 48 second-year college students in China majoring in educational technology. The results showed that online cooperative translations could significantly increase student interest and self-efficacy in specialized English translation. In cooperative translation, student engagement was significantly and linearly correlated with their interest and self-efficacy in translation. We conclude with recommendations on reforming current SETI practices in mainland China's universities. © 2016, 2015 Taylor & Francis.

Wang J.,Jiangsu University | Wang J.,Anhui University of Science and Technology | Wang J.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Chen K.,Jiangsu University | And 3 more authors.
Nano Letters | Year: 2013

The catalytic mechanism offers an efficient tool to produce crystalline semiconductor nanowires, in which the choice, state, and structure of catalysts are active research issues of much interest. Here we report a novel solution-solid-solid (SSS) mechanism for nanowire growth catalyzed by solid-phase superionic conductor nanocrystals in low-temperature solution. The preparation of Ag2Se-catalyzed ZnSe nanowires at 100-210 C is exampled to elucidate the SSS model, which can be extendable to grow other II-VI semiconductor (e.g., CdSe, ZnS, and CdS) nanowires by the catalysis of nanoscale superionic-phase silver or copper(I) chalcogenides (Ag2Se, Ag2S, and Cu2S). The exceptional catalytic ability of these superionic conductors originates from their structure characteristics, known for high-density vacancies and fast mobility of silver or copper(I) cations in the rigid sublattice of Se2- or S2- ions. Insights into the SSS mechanism are provided based on the formation of solid solution and the solid-state ion diffusion/transport at solid-solid interface between catalyst and nanowire. © 2013 American Chemical Society.

Liu X.,Jiangsu University | Jiang N.,Jiangsu University | Cao J.,Nanjing Southeast University | Wang S.,Jiangsu University | Wang Z.,Nanjing University of Posts and Telecommunications
Journal of the Franklin Institute | Year: 2013

This paper is concerned with the finite-time stabilization for a class of stochastic BAM neural networks with parameter uncertainties. Compared with the previous references, a continuous stabilizator is designed for stabilizing the states of stochastic BAM neural networks in finite time. Based on the finite-time stability theorem of stochastic nonlinear systems, several sufficient conditions are proposed for guaranteeing the finite-time stability of the controlled neural networks in probability. Meanwhile, the gains of the finite-time controller could be designed by solving some linear matrix inequalities. Furthermore, for the stochastic BAM neural networks with uncertain parameters, the problem of robust finite-time stabilization could also be ensured as well. Finally, two numerical examples are given to illustrate the effectiveness of the obtained theoretical results. © 2013 The Franklin Institute.

Qi J.,Jiangsu University | Li X.,Peking University | Qian X.,Massachusetts Institute of Technology | Feng J.,Peking University
Applied Physics Letters | Year: 2013

In this letter we propose a universal strategy combining external electric field with the ripple of membrane to tune the bandgap of semiconducting atomic monolayer. By first-principles calculations we show that the bandgap of rippled MoS2 monolayer can be tuned in a large range by vertical external electric field, which is expected to have little effect on MoS2 monolayer. This phenomenon can be explained from charge redistribution under external electric field by a simple model. This may open an avenue of optimizing monolayer MoS2 for electronic and optoelectronic applications by surface patterning. © 2013 AIP Publishing LLC.

Tang D.-Q.,Jiangsu University | Yin X.-X.,Jiangsu Key Laboratory for the study of New Drug and Clinical PharmacyXuzhou Medical CollegeYunlongChina | Ong C.N.,Nus Environmental Research Instnational University Of Singapore5 gineering Srive 1Singapore117411Singapore
Mass Spectrometry Reviews | Year: 2014

Hydrophilic interaction chromatography (HILIC) is an emerging separation mode of liquid chromatography (LC). Using highly hydrophilic stationary phases capable of retaining polar/ionic metabolites, and accompany with high organic content mobile phase that offer readily compatibility with mass spectrometry (MS) has made HILIC an attractive complementary tool to the widely used reverse-phase (RP) chromatographic separations in metabolomic studies. The combination of HILIC and RPLC coupled with an MS detector expands the number of detected analytes and provides more comprehensive metabolite coverage than use of only RP chromatography. This review describes the recent applications of HILIC-MS/MS in metabolomic studies, ranging from amino acids, lipids, nucleotides, organic acids, pharmaceuticals, and metabolites of specific nature. The biological systems investigated include microbials, cultured cell line, plants, herbal medicine, urine, and serum as well as tissues from animals and humans. Owing to its unique capability to measure more-polar biomolecules, the HILIC separation technique would no doubt enhance the comprehensiveness of metabolite detection, and add significant value for metabolomic investigations. © 2014 Wiley Periodicals, Inc.

Qu W.,Jiangsu University | Qu W.,University of California at Davis | Pan Z.,U.S. Department of Agriculture | Pan Z.,University of California at Davis | Ma H.,Jiangsu University
Journal of Food Engineering | Year: 2010

To develop value-added antioxidants from the peel and seeds of pomegranate marc, a by-product after pomegranate juice processing, the effects of drying before extraction and processing parameters on the extraction kinetics and product properties were systematically studied using water as an environmental friendly solvent for the extraction. The results showed that the drying process did not significantly affect the yield, content, and activity of antioxidants from either the peel or seeds. The antioxidants extracted from the peel had higher yield and content than those from the seeds. The yield and content of antioxidants increased with reduced particle size and increased water/sample ratio and temperature, but antioxidant activity was low when extraction temperature was high. By considering the antioxidant activity and operation cost, the recommended extraction conditions were peel particle size of 0.2 mm, water/peel ratio of 50/1 (w/w), temperature of 25 °C, and extraction time of 2 min, which gave the high antioxidant yield (11.5%) and content (22.9%), and DPPH scavenging activity of 6.2 g/g. Kinetic models were successfully developed for describing the extraction processes with different processing parameters.

Gao C.,Jiangsu University | Dong C.,Jiangsu University | Xue F.,China Electrical Power Technology and Equipment Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

In recent years, China's electric vehicle industry and related infrastructure construction has entered a phase of rapid development, large-scale electric vehicle charging has become a practical problem in the grid operation and planning. The electric vehicle (EV) charging system is a complex adaptive system (CAS). We presented a multi-agent-based EV charging simulation system on SWARM platform for studying the impact of the large-scale electric vehicles integration into the power grid. We constructed two kinds of agents: the electric vehicle agent and the charging utility agent, and build the transportation and grid environments. We simulated the interaction among the agents, and that among the agents and the environments. The agents continuously optimize their decisions according to their learning. The results show that the simulation could reflects the actual EV charging conditions through the interaction modeling among the EV, charging utility, power grid and the transportation network. This provides a convenient tool for further studying of the EV related problems. © 2012 Chinese Society for Electrical Engineering.

Wu J.,Jiangsu University | Bai S.,Jiangsu University | Shen X.,Jiangsu University | Shen X.,Jiangsu Polytechnic University | Jiang L.,Jiangsu University
Applied Surface Science | Year: 2010

Graphene-based nanocomposites are emerging as a new class of materials that hold promise for many applications. In this paper, we present a facile approach for the preparation of graphene/CdS nanocomposites through simple reflux processes, in which thiourea (CS(NH2)2) and thioacetamide (C2H5NS) act as a sulphide source, respectively. The samples were characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR), ultraviolet-visible (UV-vis) spectroscopy and thermogravimetry analysis. It was shown that in the nanocomposites, the CdS nanoparticles were densely and uniformly deposited on the graphene sheets, and the sulphide source used has a great influence on the morphology, structure and property of the graphene/CdS nanocomposites. The good distribution of CdS nanoparticles on graphene sheets guarantees the efficient optoelectronic properties of graphene/CdS and would be promising for practical applications in future nanotechnology. © 2010 Elsevier B.V. All rights reserved.

Qi J.,Jiangsu University | Qi J.,Nanjing University of Aeronautics and Astronautics | Qian X.,Massachusetts Institute of Technology | Qi L.,Massachusetts Institute of Technology | And 5 more authors.
Nano Letters | Year: 2012

Two-dimensional atomic sheets such as graphene and boron nitride monolayers represent a new class of nanostructured materials for a variety of applications. However, the intrinsic electronic structure of graphene and h-BN atomic sheets limits their direct application in electronic devices. By first-principles density functional theory calculations we demonstrate that band gap of zigzag BN nanoribbons can be significantly tuned under uniaxial tensile strain. The unexpected sensitivity of band gap results from reduced orbital hybridization upon elastic strain. Furthermore, sizable dipole moment and piezoelectric effect are found in these ribbons owing to structural asymmetry and hydrogen passivation. This will offer new opportunities to optimize two-dimensional nanoribbons for applications such as electronic, piezoelectric, photovoltaic, and opto-electronic devices. © 2012 American Chemical Society.

Cai S.,Jiangsu University | Zhou P.,Jiangsu University | Liu Z.,Shanghai University
Chaos | Year: 2014

This paper concerns the problem of exponential synchronization for a class of general delayed dynamical networks with hybrid coupling via pinning periodically intermittent control. Both the internal delay and coupling delay are taken into account in the network model. Meanwhile, the transmission delay and self-feedback delay are involved in the delayed coupling term. By establishing a new differential inequality, several simple and useful exponential synchronization criteria are derived analytically. It is shown that the controlled synchronization state can vary in comparison with the conventional synchronized solution, and the degree of the node and the inner delayed coupling matrix play important roles in the controlled synchronization state. By choosing different inner delayed coupling matrices and the degrees of the node, different controlled synchronization states can be obtained. Furthermore, the detail pinning schemes deciding what nodes should be chosen as pinned candidates and how many nodes are needed to be pinned for a fixed coupling strength are provided. The simple procedures illuminating how to design suitable intermittent controllers in real application are also given. Numerical simulations, including an undirected scale-free network and a directed small-world network, are finally presented to demonstrate the effectiveness of the theoretical results. © 2014 AIP Publishing LLC.

Liu X.,Jiangsu University | He R.,Jiangsu University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

In order to promote the performance of the electromagnetic-hydraulic hybrid brake system when sudden stop occurs, a kind of hybrid system which adapts electromagnetic and hydraulic braking system was developed; it built a hydraulic mathematical model and a mathematical model of electromagnetic brake system which is different in low speed and high speed. Based on the force analysis of the 1/4 vehicle model, a sliding mode controller has been designed and hardware in loop experiment platform has also been constructed. The experiment which simulates on asphalt and ice road was made to compare with the commercial ABS at the same conditions. The results indicate that the hybrid brake system has more rapid responds time, more stable slip ratio controlling ability and less brake time than traditional hydraulic brake system. And at the same time, due to the electromagnetic braking system, the system's abrasion and the braking heat fading or thermal failure is falling.

Li P.,Nanjing Forestry University | Wang J.,Jiangsu University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

In recent years, with the rapid development of greenhouse agriculture and information technology, more and more modern information technologies were applied in greenhouse environment management. And those technologies promote the development of intelligent management technology for greenhouse environment. Aiming at the demands of intelligent management for greenhouse environment information oriented to internet of things(IOT), this paper analyzed the research progress of intelligent management for greenhouse environment information from three aspects, information acquisition, information processing and decision-making service of greenhouse environment, and the future studies about intelligent management of greenhouse environment were proposed.

Feng J.,Peking University | Li W.,Massachusetts Institute of Technology | Qian X.,Massachusetts Institute of Technology | Qi J.,Jiangsu University | And 2 more authors.
Nanoscale | Year: 2012

Two-dimensional atomic sheets of carbon (graphene, graphane, etc.) are amenable to unique patterning schemes such as cutting, bending, folding and fusion that are predicted to lead to interesting properties. In this review, we present theoretical understanding and processing routes for patterning graphene and highlight potential applications. With more precise and scalable patterning, the prospects of integrating flat carbon (graphene) with curved carbon (nanotubes and half nanotubes) and programmable graphene folding are envisioned. © 2012 The Royal Society of Chemistry.

Xu S.-C.,China University of Mining and Technology | He Z.-X.,Nanjing Forestry University | He Z.-X.,Jiangsu University | Long R.-Y.,China University of Mining and Technology
Applied Energy | Year: 2014

This study analyzes factors that influence carbon emissions due to fossil energy consumption in China to identify key factors for policies promoting carbon emission reductions. Carbon emissions for energy consumption are decomposed into energy structure, energy intensity, industry structure, economic output, and population scale effects. The major driver of carbon emissions is the economic output effect, followed by population scale and energy structure effects. The energy intensity effect is a main inhibitory factor. The factors influencing carbon emissions in China were investigated for different industries, sectors and regions. The results show that carbon emissions mostly arise from industry, while the other sectors generally exhibit good performance in reducing emissions. In industry, the main contributors to carbon emissions are electricity production, petroleum processing and coking, metal smelting and rolling, chemical manufacture, and non-metal mineral products. Regional analysis revealed differences in economic output, energy intensity, and industrial structure among three regions of China. Policy implications in terms of industrial structure and energy consumption are highlighted. © 2014 Elsevier Ltd.

Huang D.,Jiangsu University | Zhou H.,Jiangsu University | Lin L.,Jiangsu University
Energy Procedia | Year: 2011

Due to the increasing awareness of the depletion of fossil fuel resources and environmental issues, biodiesel became more and more attractive in the recent years. Biodiesel production is a promising and important field of research because the relevance it gains from the rising petroleum price and its environmental advantages. This paper reviews the history and recent developments of Biodiesel, including the different types of biodiesel, the characteristics, processing and economics of Biodiesel industry. The application of biodiesel in automobile industry, the challenges of biodiesel industry development and the biodiesel policy are discussed as well. © 2011 Published by Elsevier B.V.

Qian J.,Jiangsu University | Lv P.,Jiangsu University | Yue X.,Shanghai University | Liu C.,Gannan Normal University | Jing Z.,Jiangsu University
Knowledge-Based Systems | Year: 2015

Attribute reduction is one of the important research issues in rough set theory. Most existing attribute reduction algorithms are now faced with two challenging problems. On one hand, they have seldom taken granular computing into consideration. On the other hand, they still cannot deal with big data. To address these issues, the hierarchical encoded decision table is first defined. The relationships of hierarchical decision tables are then discussed under different levels of granularity. The parallel computations of the equivalence classes and the attribute significance are further designed for attribute reduction. Finally, hierarchical attribute reduction algorithms are proposed in data and task parallel using MapReduce. Experimental results demonstrate that the proposed algorithms can scale well and efficiently process big data. © 2014 Elsevier B.V.All rights reserved.

Qu W.,Jiangsu University | Breksa Iii A.P.,U.S. Department of Agriculture | Pan Z.,U.S. Department of Agriculture | Pan Z.,University of California at Davis | Ma H.,Jiangsu University
Food Chemistry | Year: 2012

The anti-oxidant content and potential health benefits associated with consuming pomegranate and pomegranate-containing products has lead to increased consumer demand for this crop resulting in it becoming a high value crop. The potential health benefits and high anti-oxidant content of this fruit is attributed to the polyphenolic compounds it contains, including the ubiquitous phenolic acids, gallic acid and ellagic acid, and punicalagin A and punicalagin B, two polyphenolics unique to this fruit. A rapid HPLC-UV method targeting these four metabolites requiring minimal sample cleanup and offering runtimes half as long as existing methods was established. Within day and inter-day run-to-run variability for the four metabolites ranged from 1.9% to 6.6% and 5.3% to 11.4%, respectively. Spike recovery percentages for gallic acid, punicalagin A, punicalagin B and ellagic acid were found to be 98.5%, 92.4%, 95.5%, and 96.5%, respectively. This method was applied to the evaluation of various pomegranate products, including commercial drinks, handmade juice, and marc extracts. This method may be readily used to verify the presence of pomegranate metabolites in juices, extracts, and other products. © 2011 Elsevier Ltd. All rights reserved.

Cui F.,Jiangsu University | Zhao L.,Shanghai University
International Journal of Molecular Sciences | Year: 2012

The objective of the study was to optimize the nutrition sources in a culture medium for the production of xylanase from Penicillium sp.WX-Z1 using Plackett-Burman design and Box-Behnken design. The Plackett-Burman multifactorial design was first employed to screen the important nutrient sources in the medium for xylanase production by Penicillium sp.WX-Z1 and subsequent use of the response surface methodology (RSM) was further optimized for xylanase production by Box-Behnken design. The important nutrient sources in the culture medium, identified by the initial screening method of Placket-Burman, were wheat bran, yeast extract, NaNO3, MgSO4, and CaCl2. The optimal amounts (in g/L) for maximum production of xylanase were: wheat bran, 32.8; yeast extract, 1.02; NaNO3, 12.71; MgSO4, 0.96; and CaCl2, 1.04. Using this statistical experimental design, the xylanase production under optimal condition reached 46.50 U/mL and an increase in xylanase activity of 1.34-fold was obtained compared with the original medium for fermentation carried out in a 30-L bioreactor. © 2012 by the authors; licensee MDPI, Basel, Switzerland.

Bao X.,Jiangsu University | Zhu X.,Nanjing University of Posts and Telecommunications | Song T.,Nanjing Southeast University | Ou Y.,Jiangsu University
IEEE Transactions on Vehicular Technology | Year: 2014

Visible light communication (VLC) uses a vast unregulated and free light spectrum. It is considered to be a solution for overcoming the crowded radio spectrum for wireless communication systems. However, duplex communication, user mobility, and handover mechanisms are becoming challenging tasks in a VLC system. This paper proposes a hybrid network model of VLC and orthogonal frequency-division multiplexing access (OFDMA) in which the VLC channel is only used for downlink transmission, whereas OFDMA channels are served for uplinks in any situation or for downlinks only without VLC hotspots coverage. A novel protocol is proposed combined with access, horizontal, and vertical handovermechanisms formobile terminal (MT) to resolve user mobility among different hotspots and OFDMA system. A new VLC network scheme and its frame format are presented to deal with the multiuser access problems in every hotspot. In addition, a new metric ρ is defined to evaluate the capacity of this hybrid network as the spatial density of interarrival time of MT requests in s-1m-2 under the assumption of the homogenous Poisson point process (HPPP) distribution of MTs. Analytical and simulation results show improvements in capacity performance of the hybrid, when compared to OFDMA system. © 2013 IEEE.

Qian J.,Jiangsu University | Miao D.,Tongji University | Zhang Z.,Tongji University | Yue X.,Tongji University | Yue X.,Shanghai University
Information Sciences | Year: 2014

Attribute reduction is the key technique for knowledge acquisition in rough set theory. However, it is still a challenging task to perform attribute reduction on massive data. During the process of attribute reduction on massive data, the key to improving the reduction efficiency is the effective computation of equivalence classes and attribute significance. Aiming at this problem, we propose several parallel attribute reduction algorithms in this paper. Specifically, we design a novel structure of 〈key,value〉 pair to speed up the computation of equivalence classes and attribute significance and parallelize the traditional attribute reduction process based on MapReduce mechanism. The different parallelization strategies of attribute reduction are also compared and analyzed from the theoretic view. Abundant experimental results demonstrate the proposed parallel attribute reduction algorithms can perform efficiently and scale well on massive data. © 2014 Elsevier Inc. All rights reserved.

Qian J.,Nanjing Southeast University | Qian J.,Jiangsu University | Pan X.,Nanjing Southeast University | Liu S.,Nanjing Southeast University
Analytica Chimica Acta | Year: 2013

A novel homogeneous immunoassay based on Förster resonance energy transfer for sensitive detection of tumor, e.g., marker with carcinoembryonic antigen (CEA), was proposed. The assay was consisted of polyclonal goat anti-CEA antibody labeled luminescent CdTe quantum dots (QDs) as donor and monoclonal goat anti-CEA antibody labeled gold nanoparticles (AuNPs) as acceptor. In presence of CEA, the bio-affinity between antigen and antibody made the QDs and AuNPs close enough, thus the photoluminescence (PL) quenching of CdTe QDs occurred. The PL properties could be transformed into the fluorometric variation, corresponding to the target antigen concentration, and could be easily monitored and analyzed with the home-made image analysis software. The fluorometric results indicated a linear detection range of 1-110ngmL-1 for CEA, with a detection limit of 0.3ngmL-1. The proposed assay configuration was attractive for carcinoma screening or single sample in point-of-care testing, and even field use. In spite of the limit of available model analyte, this approach could be easily extended to detection of a wide range of biomarkers. © 2013 Elsevier B.V.

Yang W.M.,National University of Singapore | Chua K.J.,National University of Singapore | Pan J.F.,Jiangsu University | Jiang D.Y.,National University of Singapore | An H.,National University of Singapore
Energy Conversion and Management | Year: 2014

A high and uniform wall temperature distribution is desirable for Micro-TPV system application. In this work, numerical simulation combined with experimental test is conducted to study the combustion of hydrogen-air mixture in a microcylindrical combustor with and without a heat recuperator. The results indicate that the temperature distribution along the wall of the micro combustor with a heat recuperator is more uniform and the mean wall temperature is increased by up to 123 K compared to that without a heat recuperator. A micro-TPV system is also prototyped and the performance is tested under various operating conditions, and the results indicate that the electrical power of the system is significantly increased for the micro-TPV system with a heat recuperator. When H2 flow rate is 4.02 g/h and H2/air equivalence ratio is 0.8, the electrical power of the micro-TPV system with a heat recuperator is increased from 0.74 W to 1.26 W, corresponding to an increase of 70%. © 2013 Elsevier Ltd. All rights reserved.

Zhou J.,Yulin Normal University | An L.,Jiangsu University | Zhang F.,Guangxi University for Nationalities
Inorganic Chemistry | Year: 2011

Two novel open-framework thioindate-thioantimonates [M(dap) 3]InSb3S7 [M = Co(1), Ni (2); dap = 1,2-diaminopropane] have been solvothermally synthesized and structurally characterized. 1 and 2 consist of InS4 tetrahedra and SbS 3 3- trigonal pyramids, which are interconnected to form the first examples of three-dimensional In-Sb-S open frameworks with 8-, 12-, and 16-ring intersecting channels. © 2010 American Chemical Society.

Georgescu P.,Technical University Gheorghe Asachi | Zhang H.,Jiangsu University
Nonlinear Analysis: Real World Applications | Year: 2010

In this paper, we consider an integrated pest management model with disease in the pest and a stage structure for its natural predator, which is subject to impulsive and periodic controls. A nonlinear incidence rate expressed in an abstract form, is used to describe the propagation of the disease, which is spread through the periodic release of infective pests, the functional response of the mature predator also being given in an abstract, unspecified form. Sufficient conditions for the local and global stability of the susceptible pest-eradication periodic solution are found by means of Floquet theory and comparison methods, the permanence of the system also being discussed. These stability conditions are shown to be biologically significant, being reformulated as balance conditions for the susceptible pest class. © 2008 Elsevier Ltd. All rights reserved.

Dai J.,Jiangsu University | Xu W.,Guangdong University of Technology | Zhao D.,Jiangsu University
Signal Processing | Year: 2012

In this paper, we propose a real-valued direction-of-arrival (DOA) estimation method for uniform linear arrays (ULAs) in the presence of unknown mutual coupling. By taking advantage of the special structure of the mutual coupling matrix for ULAs, the effect of mutual coupling is eliminated by the inherent mechanism of the proposed method. Moreover, the computational complexity is reduced by a factor of at least four after further performing a unitary transformation capable of converting a complex covariance matrix into a real one. We also investigate the performance loss due to the imperfect structure of the mutual coupling matrix under the NEC-2 code. Experimental results with respect to the NEC-2 code illustrate that our new method even outperforms a state-of-the-art method in the literature. © 2012 Elsevier B.V. All rights reserved.

Zheng G.,Nanjing University of Information Science and Technology | Cong J.,Jiangsu University | Xu L.,Nanjing University of Information Science and Technology | Su W.,University of Victoria
Optics Letters | Year: 2014

We demonstrate the design of an efficient angle-insensitive guided mode resonance filter (GMRF), with narrow bandwidth and low sideband reflection, for TE-polarized waves. The reflection properties of the multilayer structure have been studied, and the results verify that the thin film design of the gradient-index layer is important for the realization of an angle-insensitive filter. Various gradient coefficients of the thin film have distinct effects on the reflection spectrum. For an increasing incident angle, although the line-shape symmetry becomes less perfect, the positions of the resonant peak remain the same. The GMRF proposed here has many desirable attributes that lends itself to being an excellent platform, for devices such as lasers, detectors, filters, and sensors. © 2014 Optical Society of America

News Article | April 13, 2016
Site: phys.org

Schematic drawing of an on-chip chaotic microcavity with an inner absorber. The probe laser light is coupled into the microcavity from free space, and the cavity modes can be characterized by the transmission spectrum. Credit: Peking University Stable states (or resonances) are always of importance in understanding reactions and collision processes of all energy scales, but they often prove difficult to detect in experiments, particularly when a system exhibits chaos. A team led by Professor Yun-Feng Xiao of Peking University has recently conducted the first study of the statistics of chaotic resonances in an optical microcavity. The work has appeared as a Rapid Communication in the April issue of Physical Review E. Chaos is usually identified as a classical phenomenon, typical of a complex, macroscopic world. However, chaos may appear even in such a small device as a silicon-made microcavity of deformed circular shape. Among the long-standing predictions that characterize the analogy between the micro- and the macroscopic worlds (in physics jargon, quantum-to-classical correspondence), Weyl's law occupies a prominent place, and, surprisingly, it is still awaiting full experimental validation. With its contribution, Prof. Xiao's group, in a collaborative effort with Domenico Lippolis of Tsinghua University and Jiangsu University, has taken a significant step toward a definitive test of this theory at optical frequencies. Weyl's law predicts the number of resonances within a certain energy or frequency range. The experimental task consists of measuring the statistics of the resonances from a far-field spectrum and comparing it to the theoretical expectation. "Easier said than done, to say the least," Dr. Lippolis remarks, pointing out the numerous difficulties involved in singling out resonances as broadened peaks in a spectrum due to the overlapping of several modes, and the heavy energy losses of the cavity. In order to overcome this hurdle, Prof. Xiao's team takes advantage of the well-known quantum effect of tunneling, which connects the chaotic field with the so-called whispering gallery modes (WGM). The key point is that the WGMs are easily recognizable from the spectrum as very sharp peaks, and they can be counted accurately, which indirectly draws reliable information on the desired statistics of the chaotic resonances. Silica cavities of a few microns thick and 100-micron wide were fabricated through optical lithography by Li Wang, a graduate student in Prof. Xiao's group, who also performed the experiments. A microcavity sits on the top of a silicon pillar of tunable radius and acts as a light absorber. Etching the pillar before every measurement modifies the spectrum of the resonances excited by visible or infrared light, allowing for a thorough statistical analysis. The main result emerging from the measurements is experimental evidence of chaotic light-matter interactions that take place within a short enough time for waves to behave like classical rays (the so-called Ehrenfest time of quantum-to-classical correspondence). According to Prof. Xiao, "The indirect and yet clear experimental detection of a signature of chaos, obtained by exclusively counting non-chaotic resonances, is remarkable and very encouraging for a full validation of Weyl's law at optical frequencies. Additionally, our approach may provide a general tool for the analysis of chaotic resonances in open systems, and thus it may soon become of inspiration to a wide community of physicists." More information: Li Wang et al. Statistics of chaotic resonances in an optical microcavity, Physical Review E (2016). DOI: 10.1103/PhysRevE.93.040201

Zhou Z.,Jiangsu University | Jia Z.,Jiangsu University | Yan D.,Shanghai JiaoTong University
Polymer | Year: 2010

This work theoretically deals with the kinetics of the co-polycondensation of AB2 and AB type monomers in the presence of multi-functional cores. The analytical expressions of the molecular size distribution function and the molecular parameters of the resultant hyperbranched polymers were derived. The general expressions are applicable for the copolymerization of AB2 and AB monomers and the polymerization of homogeneous AB2 or AB monomers in either presence or absence of cores. The feed ratio of the core molecules (β) or the AB2 monomers (α) to the total monomers significantly affects the molecular weight distribution and the molecular parameters of the products. The polydispersity index of the copolymerization of AB2 and AB monomers without cores is infinite when the reaction approaches to completion, while the presence of core molecules makes it become finite. The polydispersity index decreases with decreasing α, which also decreases with increasing β. The higher the functionality of the core (f), the lower the polydispersity index is as well. © 2010 Elsevier Ltd.

Jeng T.-M.,Chienkuo Technical University | Tzeng S.-C.,Chienkuo Technical University | Xu R.,Jiangsu University
International Journal of Heat and Mass Transfer | Year: 2014

This work experimentally investigated the local and average heat transfer characteristics in a 180-deg round turned channel with discrete aluminum-foam blocks. The air was used as coolant. Several aluminum-foam blocks (0.90 porosity and 10 PPI pore density) were installed discretely in the 180-deg round turned channel with the square cross section. Total four kinds of test section, with various arrangements of aluminum-foam blocks, were employed. The results indicate that the local peak values of the Nusselt numbers would appear at the positions of the aluminum-foam blocks. The local Nusselt numbers of the upper and bottom walls were higher than those of the side walls in the straight ducts; while the local Nusselt numbers of the outer side wall were higher than those of others walls in the turn. The local Nusselt numbers of the inner side wall generally were the lowest values. Besides, the average Nusselt numbers of the present porous channels were 74-140% higher than that of the empty channel, suggesting the significant heat transfer enhancement of the aluminum-foam blocks. Furthermore, in the straight duct, the staggered aluminum-foam blocks could promote heat transfer more efficiently than the symmetric aluminum-foam blocks did. The average Nusselt numbers of Model 3 and Model 4 (the whole channel filled with aluminum-foam blocks) were 20-30% higher than those of Model 1 and Model 2 (only straight ducts filled with aluminum-foam blocks). It is noteworthy that the pressure drops of Model 1 and Model 3 test sections (vertically symmetric configuration) are much higher than those of Model 2 and Model 4 test sections (vertically staggered configuration) by 180-280%. © 2013 Elsevier Ltd. All rights reserved.

Jeng T.-M.,Chienkuo Technical University | Tzeng S.-C.,Chienkuo Technical University | Xu R.,Jiangsu University
International Journal of Heat and Mass Transfer | Year: 2014

This study experimentally investigated the heat transfer characteristics of a rotating cylinder under lateral air impinging jet. The height and diameter of the cylinder were fixed, and the variable parameters were as follows: (1) the jet Reynolds number (Rej = 655-60237); (2) the rotational Reynolds number (Rer = 1975-7899); (3) the ratio of the cylinder diameter (D) to the nozzle width (w) (D/w = 2-16); (4) the relative jet-impinging distance (L/w = 1-16, L is the shortest nozzle-to-cylinder distance). This experiment measured detailed temperature on the heated wall surface of the cylinder using an infrared thermo tracer, and observed the smoke flow characteristics of the stationary and rotating cylinder under impinging jet flow using visualization technique. The experimental results showed that the rotation changed the separation position of impinging jet flow on the cylinder, and allowed the surface temperature of the cylinder to tend towards uniformity along the circumferential direction of the cylinder. In addition, the heat transfer experiment included the pure rotating condition, the pure jet-flow condition and the coexistent condition of rotation and jet flow. The results showed that the average Nusselt number (Nu) increased with the increase of Rej and Rer, and decreased with the increase of D/w. The influence of D/w on Nu decreased with the increase of L/w, and Nu first increased and then decreased with the increase of L/w. In other words, there is a critical L/w value that can produce the highest Nu, and the critical L/w value increased with D/w. Finally, this study proposed reasonable and accurate empirical correlations of Nu in view of three test conditions. All the results can provide reference for practical design of the cooling system in relevant power machinery. © 2013 Elsevier Ltd. All rights reserved.

Chen X.Z.,Jiangsu University | Chen S.B.,Shanghai JiaoTong University
Industrial Robot | Year: 2010

Purpose - The recognition and positioning of start welding position (SWP) is the first step and one of the key technologies to realize autonomous robot welding. The purpose of this paper is to describe a method developed to accomplish successful autonomous detection and guiding of SWP. Design/methodology/approach - The images of workpieces are snapped by charge coupled device (CCD) cameras in a relative large range without additional light. The recognized methods of SWP are analyzed according to the given definition. A two-step method named "coarse-to-fine" is proposed to recognize the SWP accurately. The first step is to solve the curve functions of seam and workpieces boundaries by fitting. The intersection point is regarded as initial value of SWP. The second step is to establish a small window that takes the initial value of SWP as centre. Then, the SWP is obtained exactly by corner detection in the window. Both the abundant information of original image and the structured information of recognized image are used according to given rules, which takes full advantage of the image information and improves the recognized precision. Findings - The detected results show that the actual and calculated positions by first step of SWP are identical for regular seam, but different for the irregular curve seam. The exact results can be calculated by the two-step method in the paper for both regular and irregular seams. The typical planar "S-shape" and spatial arc curved seams are selected to carry out autonomous guiding of SWP. Originality/value - The experimental results are given based on the introduction of 3D reconstructed and guided method. The guided precision is less than 1.1 mm, which meets the requirements of practical production. The proposed two-step method recognizes the SWP rapidly and exactly from coarse to fine. © Emerald Group Publishing Limited.

Yong Y.-C.,Jiangsu University | Zhong J.-J.,Shanghai JiaoTong University
Bioresource Technology | Year: 2013

The mechanism for quorum sensing (QS) regulation on aromatics degradation was investigated. Deletion of rhl QS system resulted in a significant decrease in aromatics biodegradation as well as the activity of catechol 2,3-dioxygenase (C23O, key enzyme for catechol meta-cleavage pathway) in Pseudomonas aeruginosa CGMCC1.860. Interestingly, this repression could be relieved by N-butyryl homoserine lactone (the signaling molecule of rhl QS system) addition. In accordance, the transcription level of nahH (the gene encoding C23O) and nahR (transcriptional activator) also responded to rhl perturbation in a similar way. The results indicated that rhl QS system positively controlled the catechol meta-cleavage pathway, and hence improved aromatics biodegradation. It suggested manipulation of QS system could be a promising strategy to tune the catechol cleavage pathway and to control aromatics biodegradation. © 2013 Elsevier Ltd.

Zhou Z.,Jiangsu University | Yan D.,Shanghai JiaoTong University
Macromolecular Theory and Simulations | Year: 2012

A kinetic model of the amphiphilic star block copolymerization is developed. The star polymer species, resulting from star polymerization with dendrimer cores and hydrophobic monomers, are used as macroinitiators and initiate the graft polymerization of the hydrophilic monomers. Analytical expressions for the size distributions for the species formed in every step are derived. The method with monomers added to the reaction system in batches decreases the polydispersity index for the products obtained. It reaches a minimum if the monomer feed quantity is equal in every step. Therefore, the dimension and structure of the amphiphilic star block copolymers produced can be designed by using the proposed kinetic mechanism. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Li X.,Yancheng Institute of Technology | Zhu W.,Jiangsu University
Procedia Engineering | Year: 2011

As grading results of apples based on the single feature such as size, shape or color are not accurate, this paper proposes a multi-feature information fusion method based on BP neural network and D-S evidential theory to improve the accuracy of apple grading. Firstly, size, shape and color features are extracted from the processed images of apples. Secondly, apples are classified with each kind of feature by BP network classifier and as independent evidences, the outputs of classifiers are combined to construct the basic probability assignment (BPA). Finally, using D-S fusion rules of evidences to make the decision and achieve the final grading result. The experimental results have shown that the decision information fusion method based on size, shape or color features has good performance on accuracy compared to the single feature-based method in apple grading. © 2011 Published by Elsevier Ltd.

Pan Y.,Nanyang Technological University | Zhou Y.,North China University of Water Conservancy and Electric Power | Sun T.,Jiangsu University | Er M.J.,Nanyang Technological University
Neurocomputing | Year: 2013

In the H ∞ tracking-based adaptive fuzzy controllers (HAFCs) of perturbed uncertain nonlinear systems, additional H ∞ control terms would greatly degrade fuzzy approximation abilities, which violates the original intention of using fuzzy logic systems. To solve this problem, a composite HAFC (CHAFC), which combines the HAFC with composite adaptation technique, is proposed in this paper. Outside of the approximation region, a robust stabilization controller is developed to achieve semi-global stability of the closed-loop system. Within the approximation region, a series-parallel identification model is introduced into an indirect HAFC to construct a CHAFC that can simultaneously achieve fuzzy identification and H ∞ tracking control. It is proved that the closed-loop system obtains H ∞ tracking performance in the sense that both tracking and modeling errors converge to small neighborhoods of zero. Simulated applications of aircraft wing rock suppression and inverted pendulum tracking demonstrate that the proposed approach not only effectively solves the aforementioned approximation problem, but also obviously outperforms previous approaches. © 2012 Elsevier B.V.

Qu J.,Shanghai JiaoTong University | Qu J.,Jiangsu University | Wu H.,Shanghai JiaoTong University | Cheng P.,Shanghai JiaoTong University
International Journal of Heat and Mass Transfer | Year: 2012

A simultaneous visualization and measurement study has been carried out to investigate the start-up, heat transfer and flow characteristics of three silicon-based micro pulsating heat pipes (MPHPs) with the trapezoidal cross-section having hydraulic diameters of 251 μm (#1), 352 μm (#2) and 394 μm (#3), respectively. Experiments were performed under different working fluids, filling ratios, inclination angles (bottom heating mode) and heating power inputs. It is found that (1) the silicon-based MPHPs could start up within 200 s when charged with R113 or FC-72, but they failed to start up at all inclination angle when charged with water or ethanol having lower (dP/dT) sat, higher viscosity, higher latent heat and higher surface tension at the same temperature. During the start-up period, no obvious nucleation was observed. After the start-up period, MPHPs entered the operation period. The silicon-based MPHP could operate normally even at a Bond number of 0.26 and a hydraulic diameter of 251 μm, both smaller than the corresponding values in literatures; (2) the thermal performance of MPHPs depends greatly on the type of working fluid, filling ratio and inclination angle. At the lower power input, MPHPs charged with R113 showed better thermal performance than that charged with FC-72, however, the latter exceeded the former at the higher power input. For the same working fluid, there existed an optimal filling ratio corresponding to the best thermal performance of MPHPs, which was about 52%, 55% and 47% for MPHPs #1, #2 and #3 at the vertical orientation (90°), respectively. When the MPHPs turned from the vertical to the horizontal orientation, the thermal performance tended to be decreased, indicating that the gravity effect cannot be ignored in these silicon-based MPHPs. In MPHP #3 at the inclination angle from 70° to 90°, there appeared a special thermal resistance curve with two local maximum points, which is absent in the traditional PHPs; (3) in the operation period of larger MPHP #3, nucleation boiling, bulk circulation and injection flow were all observed, while these flow patterns were absent in the smaller MPHPs #1 and #2. Intense liquid film evaporation, instead of bubbles' generation and expansion which usually activated the oscillation flow in macro-PHPs, drove the two-phase flow in the smaller MPHPs #1 and #2. © 2012 Elsevier Ltd. All rights reserved.

Qian X.,Jiangsu University | Zheng Y.,Shanghai JiaoTong University | Chen Y.,CAS Shanghai Institute of Ceramics
Advanced Materials | Year: 2016

The fast development of photoactivation for cancer treatment provides an efficient photo-therapeutic strategy for cancer treatment, but traditional photodynamic or photothermal therapy suffers from the critical issue of low in vivo penetration depth of tissues. As a non-invasive therapeutic modality, sonodynamic therapy (SDT) can break the depth barrier of photoactivation because ultrasound has an intrinsically high tissue-penetration performance. Micro/nanoparticles can efficiently augment the SDT efficiency based on nanobiotechnology. The state-of-art of the representative achievements on micro/nanoparticle-enhanced SDT is summarized, and specific functions of micro/nanoparticles for SDT are discussed, from the different viewpoints of ultrasound medicine, material science and nanobiotechnology. Emphasis is put on the relationship of structure/composition-SDT performance of micro/nanoparticle-based sonosensitizers. Three types of micro/nanoparticle-augmented SDT are discussed, including organic and inorganic sonosensitizers and micro/nanoparticle-based but sonosensitizer-free strategies to enhance the SDT outcome. SDT-based synergistic cancer therapy augmented by micro/nanoparticles and their biosafety are also included. Some urgent critical issues and potential developments of micro/nanoparticle-augmented SDT for efficient cancer treatment are addressed. It is highly expected that micro/nanoparticle-augmented SDT will be quickly developed as a new and efficient therapeutic modality which will find practical applications in cancer treatment. At the same time, fundamental disciplines regarding materials science, chemistry, medicine and nanotechnology will be advanced. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Shi L.,Jiangsu University | Wang Z.,Shanghai JiaoTong University | Sun G.,Nantong University
NeuroReport | Year: 2015

In recent times, dozens of articles have been rushing to report the excellent performance of curcumin in inhibiting the proliferation of glioma cells and in inducing apoptosis and autophagy. However, in this study, we found that curcumin could not only effectively inhibit the proliferation of glioma cells but also induce glioma cells to be stem-like, which showed that it caused some glioma cells to form spheres with CD133 and Nestin positive markers. Further research on its underlying mechanism showed that curcumin suppressed transition of the cells from G1 to S phase and enhanced the expression of Sox4, Sox2, and Oct4, which were essential to retain the stemness properties of glioma-initiating cells. In conclusion, we believe these findings can complement our knowledge on curcumin and arouse our attention to use curcumin for further research on glioma treatment. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.

Wang G.-G.,Jiangsu University | Gandomi A.H.,University of Akron | Zhao X.,Jiangsu University | Chu H.C.E.,National Taichung University of Education
Soft Computing | Year: 2016

For the purpose of enhancing the search ability of the cuckoo search (CS) algorithm, an improved robust approach, called HS/CS, is put forward to address the optimization problems. In HS/CS method, the pitch adjustment operation in harmony search (HS) that can be considered as a mutation operator is added to the process of the cuckoo updating so as to speed up convergence. Several benchmarks are applied to verify the proposed method and it is demonstrated that, in most cases, HS/CS performs better than the standard CS and other comparative methods. The parameters used in HS/CS are also investigated by various simulations. © 2014, Springer-Verlag Berlin Heidelberg.

Fang G.,Jiangsu University | Fang G.,Yancheng Institute of Technology | Tian L.,Jiangsu University | Sun M.,Jiangsu University | Fu M.,Jiangsu University
Energy | Year: 2012

A novel three-dimensional energy-saving and emission-reduction chaotic system is proposed, which has not yet been reported in present literature. The system is established in accordance with the complicated relationship between energy-saving and emission-reduction, carbon emissions and economic growth. The dynamic behavior of the system is analyzed by means of Lyapunov exponents and bifurcation diagrams. With undetermined coefficient method, expressions of homoclinic orbits of the system are obtained. The Šilnikov theorem guarantees that the system has Smale horseshoes and the horseshoes chaos. Artificial neural network (ANN) is used to identify the quantitative coefficients in the simulation models according to the statistical data of China, and an empirical study of the real system is carried out with the results in perfect agreement with actual situation. It is found that the sooner and more perfect energy-saving and emission-reduction is started, the easier and sooner the maximum of the carbon emissions will be achieved so as to reduce carbon emissions and energy intensity. Numerical simulations are presented to demonstrate the results. © 2012 Elsevier Ltd.

Wang Y.,Jiangsu University | Kroon J.K.M.,Durham University | Slabas A.R.,Durham University | Chivasa S.,Durham University
Proteomics | Year: 2013

Light plays an important role in plant growth, development, and response to environmental stresses. To investigate the effects of light on the plant responses to cadmium (Cd) stress, we performed a comparative physiological and proteomic analysis of light- and dark-grown Arabidopsis cells after exposure to Cd. Treatment with different concentrations of Cd resulted in stress-related phenotypes such as cell growth inhibition and decline of cell viability. Notably, light-grown cells were more sensitive to heavy metal toxicity than dark-grown cells, and the basis for this appears to be the elevated Cd accumulation, which is twice as much under light than dark growth conditions. Protein profiles analyzed by 2D DIGE revealed a total of 162 protein spots significantly changing in abundance in response to Cd under at least one of these two growing conditions. One hundred and ten of these differentially expressed protein spots were positively identified by MS/MS and they are involved in multiple cellular responses and metabolic pathways. Sulfur metabolism-related proteins increased in relative abundance both in light- and dark-grown cells after exposure to Cd. Proteins involved in carbohydrate metabolism, redox homeostasis, and anti-oxidative processes were decreased both in light- and dark-grown cells, with the decrease being lower in the latter case. Remarkably, proteins associated with cell wall biosynthesis, protein folding, and degradation showed a light-dependent response to Cd stress, with the expression level increased in darkness but suppressed in light. The possible biological importance of these changes is discussed. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhang C.,Beijing University of Chemical Technology | Zhang C.,Jiangsu University | Su H.,Beijing University of Chemical Technology | Baeyens J.,Beijing University of Chemical Technology | And 2 more authors.
Renewable and Sustainable Energy Reviews | Year: 2014

The uncontrolled discharge of large amounts of food waste (FW) causes severe environmental pollution in many countries. Within different possible treatment routes, anaerobic digestion (AD) of FW into biogas, is a proven and effective solution for FW treatment and valorization. The present paper reviews the characteristics of FW, the principles of AD, the process parameters, and two approaches (pretreatment and co-digestion) for enhancing AD of food waste. Among the successive digestion reactions, hydrolysis is considered to be the rate-limiting step. To enhance the performance of AD, several physical, thermo-chemical, biological or combined pretreatments are reviewed. Moreover, a promising way for improving the performance of AD is the co-digestion of FW with other organic substrates, as confirmed by numerous studies, where a higher buffer capacity and an optimum nutrient balance enhance the biogas/methane yields of the co-digestion system. © 2014 Elsevier Ltd. All rights reserved.

Zhou Z.,Jiangsu University | Yan D.,Shanghai JiaoTong University
Polymer | Year: 2011

The kinetics of copolycondensation of A2 and CB2 monomers with non-equal reactivity was investigated in detail. The analytical expressions of the molecular size distribution function, the average degree of polymerization, and the polydispersity index of the products obtained were derived. The gelation may take place in the range of the monomer feed ratio (λ) of A2 to CB2 from 3/4 to 3 if the reactivity ratio (r) of C to B group is 1. The range may be reduced slightly to 3/2≤λ≤3 for enough high r. High reactivity ratios are beneficial to enhance the conversion of A groups and the number average degree of polymerization at the critical point of gelation. The high weight average degree of polymerization but low number average degree of polymerization at the critical point should attribute to the reason that the larger the species formed in the reaction system, the faster its growth. A number of oligomer species are present at the critical point. Gelation may be avoided if a suitable feed ratio is used. The wide molecular weight distribution also may be improved if excluding the residual monomers and the small oligomer species. © 2011 Elsevier Ltd. All rights reserved.

Fang G.,Jiangsu University | Fang G.,Yancheng Institute of Technology | Tian L.,Jiangsu University | Fu M.,Jiangsu University | Sun M.,Jiangsu University
Applied Energy | Year: 2013

This paper examines the impacts of carbon tax on energy intensity and economic growth in a novel four-dimensional energy-saving and emission-reduction system with carbon tax constraints. Based on Lyapunov exponents and bifurcation diagrams, the dynamic behavior of the system is analyzed. The quantitative coefficients of the actual system are identified by artificial neural network. A scenario study is undertaken by observing the dynamic evolution behavior of energy intensity and economic growth in reality. The concept of turning point of energy intensity in the four-dimensional dynamic system is put forward for the first time. By adjusting the correlation coefficients of the four-dimensional system, more effective methods being performed to steadily and diligently reduce energy intensity. Take for instance the situation in China, the problem of when and how to introduce carbon tax are settled within the framework of the four-dimensional dynamic system. The results show that, as the tax levy point of carbon tax grows larger, the energy intensity of the four-dimensional system could be controlled better. It is both important and necessary to note the inhibition effect of these changes on economic growth. The best time to levy carbon tax and the best tax levy point are achieved after a comprehensive analysis within the framework of the four-dimensional dynamic system. The more appropriate time carbon tax is started, the higher growth rate of carbon tax is adopted, the better corresponding policies and laws are made, the easier the carbon emissions could be controlled and the more energy intensity could be declined, so as to achieve the goal of reducing the carbon dioxide emissions and keeping proper energy intensity. Numerical simulations are carried out to demonstrate the results. © 2013 Elsevier Ltd.

Wang S.,Jiangsu University | Wang Q.,Jiangsu University | Jiang X.,Shanghai JiaoTong University | Han X.,Shanghai JiaoTong University | Ji H.,Jiangsu University
Energy Conversion and Management | Year: 2013

The pyrolysis of two seaweed (Enteromorpha clathrata and Sargassum natans) was investigated for the production of bio-oil under different conditions. The constituents of seaweed bio-oils were greatly different from those of terrestrial biomass, especially in the presence of many nitrogen-containing compounds. Besides nitrogen-containing compounds, major components of seaweed bio-oil were hydrocarbon, ketones, aldehydes, alcohols, and phenolic compounds, as well as carboxylic acids and their derivatives. It was found from the comparison between two bio-oils that E. clathrata bio-oil had lots of hydrocarbons, carboxylic acids and their derivatives, however S. natans bio-oil contains many steroids and alcohols compounds. In addition, the oleic acid, palmitate, and peanut acid were also detected in S. natans bio-oil. Pyrolysis temperature played an important role on the distribution of seaweed bio-oil compositions, while the influence of the carrier gas was not obvious. The liquid derived from pyrolysis of protein contained more than 50% nitrogen-containing organic compounds, few phenolic compounds and aldehydes. It was concluded that the generations of hydrocarbon matters in seaweed bio-oil were associated with carbohydrates and lipids, and the nitrogen compounds were in accordance with protein. © 2013 Elsevier Ltd. All rights reserved.

Qu J.,Jiangsu University | Wu H.-Y.,Jiangsu University | Wang Q.,Shanghai JiaoTong University
Nanoscale and Microscale Thermophysical Engineering | Year: 2012

A simultaneous temperature measurement and flow visualization experiment was performed to investigate the thermal and flow behaviors of a silicon-based micro-pulsating heat pipe (micro-PHP) with trapezoidal microchannels with a hydraulic diameter of 352 m. FC-72 and R113 were used as working fluids. Variations in temperature versus time at different locations of the micro-PHP under different power inputs and typical flow patterns in microchannels were recorded. The evaporator wall temperature, or the maximum localized temperature, of the micro-PHP at moderate filling ratios was measured and compared to those derived from the empty microdevice (0% filling ratio). Experimental results showed that a micro-PHP embedded in a semiconductor chip could significantly decrease the maximum localized temperature. At a power input of 6.3 W, reductions in the evaporator wall temperature of about 42.1C (or 34.1%) and 41.9C (or 33.9%) were obtained for the micro-PHP charged with R113 at filling ratios of 41 and 58%, respectively. When the micro-PHP charged with FC-72, a maximum power input of about 9.5 W associated with a heat flux up to 10.7 W/cm 2 was reached at a moderate rise in wall temperature of the evaporator. The visualization study demonstrated that the evaporation, adiabatic, and condensation sections of the micro-PHP were largely occupied by annular, slug, and slug-bubbly flows, respectively, at a steady state characterized by sustained self-exciting oscillations of working fluid. However, no local nucleate boiling was detected in the micro-PHP at the power input range, which was different from the results reported for traditional PHPs. © 2012 Copyright Taylor and Francis Group, LLC.

Lam Q.L.K.,University of Hong Kong | Wang S.,Jiangsu University | Ko O.K.H.,University of Hong Kong | Kincade P.W.,Oklahoma Medical Research Foundation | Lu L.,University of Hong Kong
Proceedings of the National Academy of Sciences of the United States of America | Year: 2010

Regulation of apoptosis and cell cycle progression plays an essential role in the maintenance of B-cell homeostasis, because a fine balance of survival and expansion is critical for preventing lymphocytic disorders. Although remarkable progress in understanding B-cell development has been achieved, much less is known concerning niches that are critical to the maintenance of B-cell homeostasis. Leptin has recently been recognized to be important for modulating the immune responses, but it has remained unclear how leptin signaling influences B-cell physiology. A variety of lymphocytic malignancies have been reported to be linked to leptin, and therefore it is necessary to elucidate the mechanisms involved. Here we demonstrate that leptin promotes B-cell homeostasis by inhibiting apoptosis and by inducing cell cycle entry through the activation of expressions of B-cell CLL/lymphoma 2 (Bcl-2) and cyclin D1. We further show that leptin can induce Bcl-2 and cyclin D1 expression by two pathways, including the direct activation of their promoters and suppression of microRNAs (miRNAs) that target their putative 3′ untranslated regions. Amplification of these leptin-modulated miRNAs inhibited B lymphoma cell growth. These findings provide insights into mechanisms for leptin regulation of the humoral immune system and suggest new therapeutic strategies for leptin receptor expressing malignancies.

Yong Y.-C.,Jiangsu University | Zhong J.-J.,Shanghai JiaoTong University
Advances in Biochemical Engineering/Biotechnology | Year: 2013

Bacteria were considered to be lonely 'mutes' for hundreds of years. However, recently it was found that bacteria usually coordinate their behaviors at the population level by producing (speaking), sensing (listening), and responding to small signal molecules. This so-called quorum sensing (QS) regulation enables bacteria to live in a 'society' with cell-cell communication and controls many important bacterial behaviors. In this chapter, QS systems and their signal molecules for Gram-negative and Gram-positive bacteria are introduced. Most interestingly, QS regulates the important bacterial behaviors such as metabolism and pathogenesis. QS-regulated microbial metabolism includes antibiotic synthesis, pollutant biodegradation, and bioenergy production, which are very relevant to human health. QS is also well-known for its involvement in bacterial pathogenesis, such as iin nfections by Pseudomonas aeruginosa and Staphylococcus aureus. Novel disease diagnosis strategies and antimicrobial agents have also been developed based on QS regulation on bacterial infections. In addition, to meet the requirements for the detection/quantification of QS signaling molecules for research and application, different biosensors have been constructed, which will also be reviewed here. QS regulation is essential to bacterial survival and important to human health. A better understanding of QS could lead better control/manipulation of bacteria, thus making them more helpful to people. © Springer-Verlag Berlin Heidelberg 2012.

Huang C.,Shanghai JiaoTong University | Huang C.,University of Houston | Du J.,Jiangsu University | Xie K.,University of Houston
Biochimica et Biophysica Acta - Reviews on Cancer | Year: 2014

Pancreatic cancer is a devastating disease with an overall 5-year survival rate less than 5%. Multiple signaling pathways are implicated in the pathogenesis of pancreatic cancer, such as Wnt/β-catenin, Notch, Hedgehog, hypoxia-inducible factor, signal transducer and activator of transcription, specificity proteins/Krüppel-like factors, and Forkhead box (FOX). Recently, increasing evidence has demonstrated that the transcription factor FOXM1 plays important roles in the initiation, progression, and metastasis of a variety of human tumors, including pancreatic cancer. In this review, we focus on the current understanding of the molecular pathogenesis of pancreatic cancer with a special focus on the function and regulation of FOXM1 and rationale for FOXM1 as a novel molecular target for pancreatic cancer prevention and treatment. © 2014 Elsevier B.V.

Wang S.,Jiangsu University | Jiang X.M.,Shanghai JiaoTong University | Wang Q.,Jiangsu University | Han X.X.,Shanghai JiaoTong University | Ji H.S.,Jiangsu University
Energy Conversion and Management | Year: 2013

Seaweed particles were introduced to a bench-scale fluidized bed furnace to study the combustion of seaweed biomass (Enteromorpha clathrata). Quartz sand was used as the bed material. After dehydration and devolatilization, the E. clathrata char particle then burned according to the shrinking core conversion pattern. In order to identify key operating variables affecting seaweed combustion in fluidized bed. These operating variables (bed temperature, fluidization velocity and bed material height) were chosen as influential factors in this experiment. The mass ratio of the residual fixed carbon to parent fixed carbon was calculated to evaluate the influential factors. The grey relational analysis was used to study the degree of relative importance of the influential factors. Calculation results indicated that the influence of the bed height is the least, the bed temperature had the greatest influence. The experimental results and grey relational analysis can provide reference data for design of seaweed CFB furnaces. © 2012 Elsevier Ltd. All rights reserved.

Gu B.,Nanjing University of Information Science and Technology | Huang Y.,Jiangsu University | Fang X.,Jiangsu University | Wang H.,Nanjing University of Information Science and Technology
International Journal of Theoretical Physics | Year: 2014

We propose a novel entanglement concentration protocol (ECP) for nonlocal N-electron systems in a partially entangled W state, resorting to an ancillary single electron and controlled-not gates. Compared with other ECPs for W states, our ECP has some illustrious advantages. First, each N-electron entangled system can be used to complete the entanglement concentration with only an ancillary electron. It does not require that there are two copies of N-electron entangled systems in each round of entanglement concentration. Second, only one of the users, say Charlie, needs to perform the protocol, while all parties should perform the same operations as Charlie in other ECPs for W-class states. Third, only Charlie asks other parities to retain or discard their electrons, and they do not need to check their measurement results, which greatly simplifies the complication of classical communication. Fourth, our ECP has a higher success probability than other ECPs for W-class states as its success probability equals to the limit value of an ECP for a W state in theory. These advantages maybe make our ECP more useful in practical applications. © 2013 Springer Science+Business Media New York.

Tan H.,Shanghai JiaoTong University | Tan H.,Jiangsu University | Guo S.,Shanghai JiaoTong University | Yang S.,East China University of Science and Technology | And 2 more authors.
Acta Biomaterialia | Year: 2012

Gentamicin-loaded polymethylmethacrylate (PMMA), widely used for primary cemented arthroplasty and revision surgery for preventing or treating infections, may lead to the evolution of antibiotic-resistant bacteria and dysfunction of osteogenic cells, which further influence the osteointegration of bone cement. In a previous study, we reported that a new quaternized chitosan derivative (hydroxypropyltrimethyl ammonium chloride chitosan, HACC) that was loaded into PMMA significantly inhibited the formation of biofilms caused by methicillin-resistant Staphylococcus strains. In the present study, we further investigated the surface morphology, hydrophilicity, apatite formation ability and osteogenic activity of HACC-loaded PMMA. Chitosan-loaded PMMA, gentamicin-loaded PMMA and PMMA without antibiotic were also investigated and compared. The results showed that, compared to other PMMA-based cements, HACC-loaded PMMA had improved properties such as a lower polymerization temperature, prolonged setting time, porous structures after immersion in phosphate-buffered saline, higher hydrophilicity, more apatite formation on the surface after immersion in simulated body fluid, and better attachment and spreading of the human-marrow-derived mesenchymal stem cells. We also found better stem cell proliferation, osteogenic differentiation, and osteogenesis-associated genes expression on the surface of the HACC-loaded PMMA compared to the gentamicin-loaded PMMA. Therefore, this new anti-infective bone cement had improved physical properties and osteogenic activity, which may lead to better osteointegration of the bone cement in cemented arthroplasty. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Luo J.,Yancheng Institute of Technology | Xu Y.,Jiangsu University | Mao H.,Jiangsu University
Journal of Magnetism and Magnetic Materials | Year: 2015

M-type strontium ferrite substituted by RE (RE=Sm3+, Er3+) were prepared via a sol-gel method. Polypyrrole (PPy)/ferrite nanocomposites (with 20 wt% ferrite) were prepared by in situ polymerization method in the presence of ammonium persulfate. Effect of the substituted RE ions on structure, magnetic properties and microwave absorption properties were investigated by X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and vector network analyzer. All XRD patterns show the single phase of strontium hexaferrite without other intermediate phases. The crystallite size of synthesized particle is within the range of 22.2-38.1 nm. The structural in character of the composites were investigated with FT-IR analysis. It shows that the ferrite successfully packed by PPy. TEM photographs show that the particle size had grown up to 50-100 nm after coating with PPy. In the magnetization for the PPy/SrSm0.3Fe11.7O19 (SrEr0.3Fe11.7O19) composites, the coercivity (Hc) of the composites both increased compared with the undoped composite while the saturation magnetization (Ms) appeared opposite change with different RE ions. Considering the electromagnetic loss and impedance matching comprehensively, the Er-doped ferrite/PPy composite got the better microwave absorption performance with the maximum RL value of -24.01 dB in 13.8 GHz at 3.0 mm. And its width (<-10 dB) has reached 7.2 GHz which has covered the whole Ku band. © 2015 Elsevier B.V. All rights reserved.

Hu H.,Jiangsu University | Sun W.,Jiangsu University | Yu S.,Jiangsu University | Hong X.,Jiangsu University | And 8 more authors.
Diabetes Care | Year: 2014

Betatrophin, a newly identified hormone, has been recently characterized as a potent stimulator that increases the production and expansion of insulin-secreting β-cells in mice, but the physiological role of betatrophin remains poorly understood. This study measured for the first time serum betatrophin levels in newly diagnosed patients with type 2 diabetes (T2DM) and explored the correlations between its serum levels and various metabolic parameters in T2DM.RESEARCH DESIGN AND METHODS We analyzed the concentrations of betatrophin by ELISA in blood samples of 166 well-characterized individuals in whom anthropometric parameters, oral glucose tolerance test (OGTT), glycosylated hemoglobin, blood lipids, insulin sensitivity (1/homeostasismodel assesment of insulin resistance [1/HOMA-IR] and Matsuda index [ISIM]), and insulin secretion were measured. The participants were divided into newly diagnosed T2DM patients (n = 83) and age-, sex- And BMI-matched healthy control subjects (n = 83).RESULTS Serum betatrophin levels were significantly higher in T2DM patients than in healthy control subjects (613.08 [422.19-813.08] vs. 296.57 [196.53-509.46] pg/mL; P < 0.01). Serum betatrophin positively correlatedwith age, 2-h post-OGTT glucose (2hPG), and postprandial serum insulin (PSI), but negatively with 1/HOMA-IR and ISIM in T2DMpatients. In the control group, betatrophin was only positively associated with age. In T2DM subjects,multivariate regression analyses showed that age, 2hPG, and PSI were independent factors influencing serum betatrophin levels.CONCLUSIONS Circulating concentrations of betatrophin are significantly increased in T2DM patients. Our results suggest that betatrophin may play a role in the pathogenesis of T2DM. © 2014 by the American Diabetes Association.

Qu J.,Jiangsu University | Wu H.,Shanghai JiaoTong University
Advanced Materials Research | Year: 2012

This paper reports a micro-pulsating heat pipe (micro-PHP) fabricated in a silicon wafer that consists of trapezoidal microchannels with a hydraulic diameter of 394μm for electronic cooling applications. Electronic liquid FC-72 was used as the working fluid. To evaluate the maximum temperature reduction of the evaporator wall, experimental results of the vertical and horizontal-located micro-PHP at filling ratios ranging from 47% to 62% were compared with those measured from the empty micro-PHP (0% filling ratio). Results show that incorporating a micro-PHP as an integral part of silicon wafer could significantly decrease the maximum wafer temperatures and reduce the intensity of localized hot spots. At a power input of 6.0W, reductions in the evaporator wall temperature of about 32.3°C and 24.4°C were obtained for the micro-PHP at vertical and horizontal orientations, respectively. In addition, a CCD camera was employed to record the fluid movement inside microchannels and affirmed the existence of nucleation boiling and bulk circulation flow in the micro-PHP. © (2012) Trans Tech Publications, Switzerland.

Jiang X.,Dalian University of Technology | Jiang X.,KTH Royal Institute of Technology | Zhao J.,Dalian University of Technology | Li Y.-L.,Jiangsu University | And 3 more authors.
Advanced Functional Materials | Year: 2013

One of the biggest challenges in graphene applications is how one can fabricate 3D architectures comprising graphene sheets in which the resulting architectures have inherited graphene's excellent intrinsic properties but have overcome its shortcomings. Two series of 3D graphene monoliths (GMs) using zigzag or armchair graphene nanoribbons as building blocks and sp3 carbon chains as junction nodes are constructued, and calculations based on first principles are performed in order to predict their mechanical and electronic properties. The perfect match between sp2 nanoribbons and sp3 linkers results in favorable energy and mechanical/dynamic stability. Owing to their tailored motifs, wine-rack-like pores, and rigid sp3 linkers, these GMs possess high surface areas, appreciable mechanical strength, and tunable band gaps. Negative linear compressibilities in a wide range are found for the zigzag GMs. By solving the problems of zero gap and dimensionality of graphene sheets simultaneously, these GMs offer a viable strategy towards many applications, e.g., microelectronic devices, energy storage, molecular sieves, sensitive pressure detectors, and telecommunication line systems. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Shi L.,Jiangsu University | Chen J.,Jiangsu University | Yang J.,Jiangsu University | Pan T.,Jiangsu University | And 2 more authors.
Brain Research | Year: 2010

MicroRNAs (miRNAs) are small noncoding RNA molecules that regulate protein expression by cleaving or repressing the translation of target mRNAs. In mammal animals, their function mainly represses the target mRNAs transcripts via imperfectly complementary to the 3′UTR of target mRNAs. Several miRNAs have been recently reported to be involved in modulation of glioma development, especially some up-regulated miRNAs, such as microRNA-21 (miR-21), which has been found to function as an oncogene in cultured glioblastoma multiforme cells. Temozolomide (TMZ), an alkylating agent, is a promising chemotherapeutic agent for treating glioblastoma. However, resistance develops quickly and with high frequency. To explore the mechanism of resistance, we found that miR-21 could protect human glioblastoma U87MG cells from TMZ induced apoptosis. Our studies showed that TMZ markedly enhanced apoptosis in U87MG cells compared with untreated cells (P < 0.05). However, over-express miR-21 in U87MG cells could significantly reduce TMZ-induced apoptosis (P < 0.05). Pro-apoptotic Bax and anti-apoptotic Bcl-2 proteins are known to regulate the apoptosis of glioma cells. Bcl-2, resistance to induction of apoptosis, constitutes one major obstacle to chemotherapy in many cancer cells. Bax is shown to correlate with an increased survival of glioblastoma multiforme patients. Further research demonstrated that the mechanism was associated with a shift in Bax/Bcl-2 ratio and change in caspase-3 activity. Compared to control cells, cells treated with TMZ showed a significant increase in the Bax/Bcl-2 ratio and caspase-3 activity (P < 0.01). However, such effect was partly prevented by treatment of cells with miR-21 overexpression before, which appeared to downregulate the Bax expression, upregulate the Bcl-2 expression and decrease caspase-3 activity. Taken together, these results suggested that over-express miR-21 could inhibit TMZ-induced apoptosis in U87MG cells, at least in part, by decreasing Bax/Bcl-2 ratio and caspase-3 activity, which highlighted the possibility of miR-21 overexpression in the clinical resistance to chemotherapeutic therapy of TMZ. © 2010 Elsevier B.V. All rights reserved.

Gu B.,Nanjing University of Information Science and Technology | Huang Y.,Jiangsu University | Fang X.,Jiangsu University | Chen Y.,Nanjing University of Information Science and Technology
International Journal of Theoretical Physics | Year: 2013

The polarization quantum states of photon systems are fragile to the channel noise. However, recent experiments showed that the spatial quantum states of photon systems are robust. Recently, Ren et al. proposed a robust quantum secure direct communication (QSDC) protocol with spatial entanglement (Ren et al., Eur. Phys. J. D 67:30, 2013). Here we proposed a robust QSDC protocol and a robust three-party quantum secret sharing protocol with the four nonorthogonal spatial quantum states of a sequence of single photons, respectively. Both these two quantum secure communication protocols have the advantage of having a robust character and not increasing the difficulty of their implementations in experiment, compared with almost all the existing quantum secure communication protocols which are based on the polarization quantum states of photon systems. Moreover, they are more feasible than the QSDC protocol by Ren et al. as they do not require Bell-state measurements. © 2013 Springer Science+Business Media New York.

Min F.,Shanghai JiaoTong University | Gao F.,Shanghai Jiangong Hospital | Li Q.,Jiangsu University | Liu Z.,Shanghai JiaoTong University
Molecular Medicine Reports | Year: 2015

The aim of the present study was to evaluate the therapeutic effects of human umbilical cord mesenchymal stem cells (uMSCs) in the presence of angiotensin-converting enzyme 2 gene (ACE2; ACE2-uMSCs) on bleomycin (BLM)-induced lung injury and pulmonary fibrosis in mice. A total of 100 male C57BL/6 mice were divided at random into five groups (n=20) as follows: Control group, BLM group, ACE2 group, uMSC group and ACE2-uMSC group. At 7, 14 and 28 days post-treatment, the following parameters were evaluated in lung tissue: Oxidation indexes [malondialedehyde (MDA), superoxide dismutase (SOD), glutathione (GSH) and oxidized glutathione (GSSG)]; fibrosis factors [tumor necrosis factor (TNF)-β, interferon (IFN)-γ and transforming growth factor (TGF)-β]; inflammatory cytokines [Interleukin (IL)-1, IL-2, IL-6 and IL-10]; ACE2 gene expression; hydroxyproline and collagen type 1 messenger RNA (mRNA) concentration; as well as matrix metalloproteinase (MMPs; 2 and 9) and tissue inhibitor of metalloproteinase (TIMP)1-4 expression. ACE2-uMSC injection following bleomycin pretreatment significantly alleviated lung injury in mice. In addition, treatment with ACE2-uMSCs demonstrated a stronger therapeutic effect than ACE2- or uMSC treatment alone, indicated by decreased expression of MDA, GSSG, TNF-α, IFN-γ, TGF-β, IL-1, IL-2, IL-6, collagen type 1 mRNA, MMPs and TIMPs as well as hydroxyproline concentration, and upregulation of SOD, GSH and ACE2 and IL-10. In conclusion, the results of the present study demonstrated that ACE2 and uMSCs had a synergistic therapeutic effect on bleomycin-induced acute lung injury.

Lu Y.,Nanjing University | Lu Y.,Jiangsu University | Wei C.,Shanghai JiaoTong University | Xi Z.,Nanjing University
In Vitro Cellular and Developmental Biology - Animal | Year: 2014

Curcumin, a naturally occurring phenolic compound, has a diversity of antitumor activities. It has been previously demonstrated that curcumin can inhibit the invasion and metastasis of tumors through activation of the tumor suppressor DnaJ-like heat shock protein 40 (HLJ1). However, the specific roles and mechanisms of curcumin in regulating the malignant behaviors of non-small cell lung cancer (NSCLC) cells still remain unclear. In this study, we found that curcumin could inhibit the proliferation and invasion of NSCLC cells and induce G0/G1 phase arrest. Metastasis-associated protein 1 (MTA1) overexpression has been detected in a wide variety of aggressive tumors and plays an important role on cell invasion and metastasis. Our results showed that curcumin could effectively inhibit the MTA1 expression of NSCLC cells. Further research on the subsequent mechanism showed that curcumin inhibited the proliferation and invasion of NSCLC cells through MTA1-mediated inactivation of Wnt/β-catenin pathway. Wnt/β-catenin signaling was reported to play a critical cooperative role on promoting lung tumorigenesis. Thus, these investigations provided novel insights into the mechanisms of curcumin on inhibition of NSCLC cell growth and invasion and showed potential therapeutic strategies for NSCLC. © 2014, The Society for In Vitro Biology.

Zhou Z.,Jiangsu University | Yan D.,Shanghai JiaoTong University
Science China Chemistry | Year: 2010

This review introduces the kinetic theory of self-condensing vinyl polymerization (SCVP), including the SCVP of AB*inimers, the SCVP with non-equal reactivity between A*and B*groups, the SCVP in the presence of a small amount of multifunctional initiators, also the SCVP of both inimers and comonomers. The analytical expressions of various molecular parameters for the resulting hyperbranched polymers, such as the molecular size distribution function, the average molecular weight, the polydispersity index and the degree of branching, are reviewed systematically. © 2010 Science China Press and Springer-Verlag Berlin Heidelberg.

Chen X.-Z.,Jiangsu University | Huang Y.-M.,Jiangsu University | Chen S.-B.,Shanghai JiaoTong University
Industrial Robot | Year: 2012

Purpose - Stereo vision technique simulates the function of the human eyes to observe the world, which can be used to compute the spatial information of weld seam in the robot welding field. It is a typical kind of application to fix two cameras on the end effector of robot when stereo vision is used in intelligent robot welding. In order to analyse the effect of vision system configuration on vision computing, an accuracy analysis model of vision computing is constructed, which is a good guide for the construction and application of stereo vision system in welding robot field. Design/methodology/ approach - A typical stereo vision system fixed on welding robot is designed and constructed to compute the position information of spatial seam. A simplified error analysis model of the two arbitrary putting cameras is built to analyze the effect of sensors' structural parameter on vision computing accuracy. The methodology of model analysis and experimental verification are used in the research. And experiments related with image extraction, robot movement accuracy is also designed to analyze the effect of equipment accuracy and related processed procedure in vision technology. Findings - Effect of repeatability positioning accuracy and TCP calibration error of welding robot for visual computing are also analyzed and tested. The results show that effect of the repeatability on computing accuracy is not bigger than 0.3 mm. However, TCP affected the computing accuracy greatly, when the calibrated error of TCP is bigger than 0.5, the re-calibration is very necessary. The accuracy analysis and experimental technique in this paper can guide the research of three-dimensional information computing by stereo vision and improve the computed accuracy. Originality/value - The accuracy of seam position information is affected by many interactional factors, the systematic experiments and a simplified error analysis model are designed and established, the main factors such as the sensor's configurable parameters, the accuracy of arc welding robot and the accuracy of image recognition, are included in the model and experiments. The model and experimental method are significant for design of visual sensor and improvement of computing accuracy. © Emerald Group Publishing Limited.

Ding J.,Changzhou University | Yuan L.,Jiangsu University | Gao L.,Yancheng Entry exit Inspection and Quarantine Bureau | Chen J.,Yancheng Institute of Technology
Journal of Luminescence | Year: 2012

A new rhodamine derivative (RhB-Im) was synthesized as an on-off chemosensor for Cu 2+ in an acidic aqueous solution. RhB-Im exhibited chemically reversible and highly selective and sensitive fluorescence response toward Cu 2+ in aqueous acetate-buffer/DMF solution (pH 3.6) over other competitive metal ions. Upon addition of Cu 2+, RhB-Im displayed remarkable fluorescence quenching accompanied by a clear color change from pink to red. Based on the analysis of Stern-Volmer plots, a static quenching mode was proposed to be primarily responsible for the fluorescence quenching event when the concentration of Cu 2+ was low, but, the energy- and electron-transfer processes cannot be ruled out. © 2012 Elsevier B.V. All rights reserved.

Shi L.,Jiangsu University | Wang Z.,Shanghai JiaoTong University | Sun G.,Nantong University | Wan Y.,Shanghai JiaoTong University | And 2 more authors.
NeuroMolecular Medicine | Year: 2014

Despite advances in clinical therapies and technologies, the prognosis for patients with malignant glioma is poor. Our previous research demonstrated that glioma stem cells (GSCs) were crucial for glioma malignancy and accelerated tumor migration and invasion. The migration and invasion of malignant glioma cells into the surrounding normal brain tissues cause the poor outcome. miR-145, a miRNA found to be expressed in neurons, was recently found to have reduced expression in glioblastoma multiforme tumors. And miR-145 loss in glioma cells led to increased cell proliferation and invasion. However, its function on the migration and invasion of GSCs was still unknown. In this study, we aimed to identify the effects and mechanisms of miR-145 on the migration and invasion of GSCs. Our investigations revealed that miR-145 was low expressed in malignant glioma tissues and their corresponding GSCs. Knockdown of miR-145 in vitro could enhance the migration and invasion of GSCs, while up-regulation of miR-145 had the opposite effects. Further investigation of the potential mechanism demonstrated that the function of miR-145 in regulating the migration and invasion of GSCs is mediated by its targeting of ABCG2 mRNA. ABCG2 is an ATP-binding cassette transporter protein, which was identified to be overexpressed in GSCs and higher-grade glioma tissues. We found that miR-145 was negative correlated with ABCG2 levels in GSCs, and reduction in ABCG2 expression decreased the cell migration and invasion of GSCs. Further, a luciferase reporter proved that ABCG2 was a direct target of miR-145 in GSCs. Thus, these findings underscore the potential of miR-145 to regulate the migration and invasion of GSCs through targeting ABCG2. © 2014 Springer Science+Business Media New York.

Zhao W.,Nanjing Southeast University | Zhao W.,Jiangsu University | Cheng M.,Nanjing Southeast University | Hua W.,Nanjing Southeast University | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2011

A flux-switching permanent-magnet (PM) (FSPM) machine is a new class of stator-PM brushless machines, which offers the advantages of high reliability, high power density, and high efficiency. In this paper, by employing redundant winding in the existing FSPM machine topology, a new redundant FSPM (R-FSPM) machine is proposed for a fault-tolerant operation of critical applications. The redundant winding configuration is analyzed, and the corresponding suitable control strategy for the postfault operation is proposed. The electromagnetic performance of the R-FSPM motor drive under normal and fault conditions is analyzed by using a cosimulation method coupling magnetic and electrical circuit solvers. Finally, a 12-stator-tooth/10-rotor-pole R-FSPM machine is prototyped for verification. Both simulation and experimental results are presented, verifying the fault-tolerant characteristic of the proposed motor drive. © 2010 IEEE.

Huang Z.,Jiangsu University | Wang C.,Jiangsu University | Pan L.,Jiangsu University | Tian F.,University of Shanghai for Science and Technology | And 2 more authors.
Nano Energy | Year: 2013

The composite of silicon nanowires (SiNWs) and MoS3 (SiNWs@MoS3) was fabricated by a convenient method. In comparison with SiNWs, SiNWs@MoS3 exhibits remarkably enhanced photocurrent during photoelectrochemical hydrogen production. The photoelectrochemical performance of SiNWs@MoS3 is comparable to that of the composite of SiNWs and Pt nanoparticles (SiNWs@PtNPs). Electrochemical impedance spectroscopy experiments suggest that the enhanced performance of SiNWs@MoS3 can be attributed to small charge transfer resistance (i.e. fast H+ reduction kinetics ) at SiNWs@MoS3/electrolyte interface, and the large electrochemically active surface area of SiNWs@MoS3. •A high efficiency and low-cost photocathode for hydrogen production is demonstrated.•Composite of silicon nanowires and molybdenum sulfide can be fabricated by a convenient method.•Electrochemical measurements reveal the origin of enhancement in photoelectrochemical performance. © 2013 Elsevier Ltd.

Ma L.,Nanjing Southeast University | Ma L.,Jiangsu University | Da F.,Nanjing Southeast University | Zhang K.-J.,Nanjing Southeast University
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2011

In this paper, the exponential H∞ filtering problem is studied for discrete time-delay stochastic systems with Markovian jump parameters and missing measurements. The measurement missing phenomenon, which is related to the modes of subsystems, is described in the form of random matrix function and the missing probability of each sensor at every mode is governed by an individual random variable taking values in the interval [0,1]. This description of missing measurements is more general than the existing ones, where the missing probability is described by a Bernoulli distribution white sequence or a certain diagonal matrix. By using Lyapunov method and the properties of conditional mathematical expectation, we propose a novel approach to achieve the delay-dependent exponential stability criterion such that the filtering error system is mean-square exponentially stable and satisfies a prescribed H∞ performance level. Moreover, there is no equation restriction on decay rate. Then, based on the obtained sufficient criterion, the filter matrices can be directly characterized by solving a set of linear matrix inequalities (LMIs). Finally, a numerical example is provided to show the validity of the main result. © 2011 IEEE.

Li Y.,Jiangsu University | Qiu F.,Jiangsu University | Yang D.,Jiangsu University | Li X.,Jiangsu Provincial Key Laboratory of Power Machinery | Sun P.,Jiangsu Provincial Key Laboratory of Power Machinery
Biomass and Bioenergy | Year: 2011

A solid base catalyst was prepared by neodymium oxide loaded with potassium hydroxide and investigated for transesterification of soybean oil with methanol to biodiesel. After loading KOH of 30 wt.% on neodymium oxide followed by calcination at 600 °C, the catalyst gave the highest basicity and the best catalytic activity for this reaction. The obtained catalyst was characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), N2 adsorption-desorption measurements and the Hammett indicator method. The catalyst has longer lifetime and maintained sustained activity after being used for five times, and were noncorrosive and environmentally benign. The separate effects of the molar ratio of methanol to oil, reaction temperature, mass ratio of catalyst to oil and reaction time were investigated. The experimental results showed that a 14:1 M ratio of methanol to oil, addition of 6.0% catalyst, 60 °C reaction temperature and 1.5 h reaction time gave the best results and the biodiesel yield of 92.41% was achieved. The properties of obtained biodiesel are close to commercial diesel fuel and is rated as a realistic fuel as an alternative to diesel. © 2011 Elsevier Ltd.

Zhou Y.,Jiangsu University | Meng X.,New York Medical College | Zhang S.,New York Medical College | Lee E.Y.C.,New York Medical College | Lee M.Y.W.T.,New York Medical College
PLoS ONE | Year: 2012

Mammalian DNA polymerase δ (Pol δ), a four-subunit enzyme, plays a crucial and versatile role in DNA replication and DNA repair processes. We have reconstituted human Pol δ complexes in insect cells infected with a single baculovirus into which one or more subunits were assembled. This system allowed for the efficient expression of the tetrameric Pol δ holoenzyme, the p125/p50 core dimer, the core+p68 trimer and the core+p12 trimer, as well as the p125 catalytic subunit. These were isolated in milligram amounts with reproducible purity and specific activities by a highly standardized protocol. We have systematically compared their activities in order to gain insights into the roles of the p12 and p68 subunits, as well as their responses to PCNA. The relative specific activities (apparent kcat) of the Pol δ holoenzyme, core+p68, core+p12 and p125/p50 core were 100, 109, 40, and 29. The corresponding apparent Kd's for PCNA were 7.1, 8.7, 9.3 and 73 nM. Our results support the hypothesis that Pol δ interacts with PCNA through multiple interactions, and that there may be a redundancy in binding interactions that may permit Pol δ to adopt flexible configurations with PCNA. The abilities of the Pol δ complexes to fully extend singly primed M13 DNA were examined. All the subassemblies except the core+p68 were defective in their abilities to completely extend the primer, showing that the p68 subunit has an important function in synthesis of long stretches of DNA in this assay. The core+p68 trimer could be reconstituted by addition of p12. © 2012 Zhou et al.

Liu C.-B.,Jiangsu University | Cong Y.,Jiangsu University | Sun H.-Y.,Jiangsu University | Che G.-B.,Key Laboratory of Preparation and Applications of Environmental Friendly Materials
Inorganic Chemistry Communications | Year: 2014

One transition metal-organic framework [Zn(TBTC)(2,6-pydc)]n (1), has been assembled from a mixed ligand 4,5,9,14-tetraaza-benzo[b] triphenylene-11-carboxylic acid (HTBTC) with the help of pyridine-2,6- dicarboxylic acid (2,6-pydc)ligand. X-ray single crystal diffraction analysis reveals that compound 1 crystallizes in the space group of P21/c and displays a one-dimensional (1D) zigzag infinite chain, which is extended via the π-π stacking interactions between pyrazine rings and benzene rings to form 2D supramolecular layers. Compound 1 shows an excellent photocatalytic activity through degradation of methyl blue (MB), methyl violet (MV), rhodamine B (RhB) and orange G (OG). The rate of photodegradation for MV can reach 90% under Xe lamp irradiation after 4.5 h. In addition, catalytic mechanism was also discussed. © 2014 Elsevier B.V.

Hong Z.-S.,Nanjing Southeast University | Yin J.,Hohai University | Yin J.,Jiangsu University | Cui Y.-J.,ParisTech National School of Bridges and Roads
Geotechnique | Year: 2010

Oedometer tests starting from a very small effective vertical stress of 0.5 kPa were performed on three reconstituted clays with different liquid limits. The soils were prepared at various initial water contents, ranging from 0.7 to 2.0 times their corresponding liquid limits. It is observed that the e-log v compression curves show an inverse 'S' shape due to suction pressure resisting deformation, similar to that of soft natural clays caused by consolidation yield stress. The suction pressure s of the reconstituted clays can be correlated with the ratio of initial void ratio to void ratio at liquid limit e0/eL. The suction pressure curve defined by a unique relationship between suction pressure s and the normalised void ratio at suction pressure es/eL is also proposed to distin- guish between the pre-suction and the post-suction states. In addition, Burland's concept of the intrinsic compres- sion line is adopted for correlating the compression curves of various reconstituted clays at high initial water contents. It has been found that the void index is a powerful parameter for normalising the compression curves in the post-suction state. Nevertheless, it seems that Burland's intrinsic compression line slightly under- estimates the void index at the low stresses considered in this study. An extended intrinsic compression line is then derived in order to better fit the data for stresses lower than 25 kPa.

Sun B.,Jiangsu University | Chen M.-Y.,Jiangsu University | Zhang Y.-K.,Nanjing Southeast University | Zhou J.,Ningbo University
Applied Physics B: Lasers and Optics | Year: 2013

We propose an ultracompact polarization beam splitter based on an asymmetric directional coupler, which comprises of a horizontally slotted waveguide and a hybrid plasmonic waveguide. The splitter is designed such that there is a large difference between the effective indices of the TE-polarized modes for the two waveguides, while the effective index difference between the TM-polarized modes are quite small in a wide wavelength range. Numerical results demonstrate that the proposed splitter with a short device length of 5 μm shows extinction ratios as low as -20 dB with bandwidths as great as 100 nm. © 2013 Springer-Verlag Berlin Heidelberg.

Chen M.-Y.,Jiangsu University | Li Y.-R.,Jiangsu University | Zhou J.,Ningbo University | Zhang Y.-K.,Nanjing Southeast University
Journal of Lightwave Technology | Year: 2013

We propose the design of a simple large-mode area microstructured optical fiber with low bending loss and large loss difference between the fundamental mode and the high-order modes. Single-mode operation in the fiber is realized by the introduction of small diameter holes, whereas the bending loss of the fiber is realized by the introduction of three large holes in the two-ring hole microstructured optical fiber. We also introduce low-index rods into the core of the fiber, which can effectively compensate the reduction of mode area induced by bending the fiber. © 1983-2012 IEEE.

Li H.,Jiangsu University | Li H.,University of Jinan | He J.,University of Jinan | Li S.,Jiangsu University | Turner A.P.F.,Linköping University
Biosensors and Bioelectronics | Year: 2013

Highly sensitive and label-free detection of the biomarker carbohydrate antigen 15-3 (CA 15-3) remains a challenge in the diagnosis of breast cancer. Here, a novel electrochemical immunosensor capable of sensitive and label-free detection of CA 15-3 is reported. This unique immunosensor, equipped with a highly conductive graphene (i.e., N-doped graphene sheets)-modified electrode, exhibited significantly increased electron transfer and high sensitivity toward CA 15-3. This novel immunosensor, with a low detection limit of 0.012. U/mL, worked well over a broad linear range of 0.1-20. U/mL. Unlike conventional immunosensors, which usually involve complicated label processing and time-consuming separations, the use of highly conductive graphene avoids the need for labels and is simple in nature. The strategy developed for this immunosensor provides a promising approach for clinical research and diagnostic applications. © 2012.

Cheng M.,Nanjing Southeast University | Hua W.,Nanjing Southeast University | Zhang J.,Nanjing Southeast University | Zhao W.,Jiangsu University
IEEE Transactions on Industrial Electronics | Year: 2011

Permanent magnet (PM) brushless machines having magnets and windings in stator (the so-called stator-PM machines) have attracted more and more attention in the past decade due to its definite advantages of robust structure, high power density, high efficiency, etc. In this paper, an overview of the stator-PM machine is presented, with particular emphasis on concepts, operation principles, machine topologies, electromagnetic performance, and control strategies. Both brushless ac and dc operation modes are described. The key features of the machines, including the merits and drawbacks of the machines, are summarized. Moreover, the latest development of the machines is also discussed. © 2006 IEEE.

Lin L.,Jiangsu University | Cunshan Z.,Zhejiang Agriculture And forestry University | Vittayapadung S.,Chiang Mai Rajabhat University | Xiangqian S.,Jiangsu University | Mingdong D.,University of Aarhus
Applied Energy | Year: 2011

Fossil fuel resources are decreasing daily. As a renewable energy, biodiesel has been receiving increasing attention because of the relevance it gains from the rising petroleum price and its environmental advantages. This review highlights some of the perspectives for the biodiesel industry to thrive as an alternative fuel, while discussing opportunities and challenges of biodiesel. This review is divided in three parts. First overview is given on developments of biodiesel in past and present, especially for the different feedstocks and the conversion technologies of biodiesel industry. More specifically, an overview is given on possible environmental and social impacts associated with biodiesel production, such as food security, land change and water source. Further emphasis is given on the need for government's incentives and public awareness for the use and benefits of biodiesel, while promoting policies that will not only endorse the industry, but also promote effective land management. © 2010 Elsevier Ltd.

Ding S.-H.,Jiangsu University | Li S.-H.,Nanjing Southeast University
Kongzhi yu Juece/Control and Decision | Year: 2011

Finite-time control theory has attracted much attention in recent years, since finite-time stable systems usually possess better robustness and disturbance rejection properties. First of all, the origin for finite-time control method is discussed, and the frequently-used criteria for finite-time control systems is listed. Then the present research development for finite-time control systems is summarized. Finally, the future outlook on finite-time control is discussed.

Wang Y.,Jiangsu University | Du Z.-J.,University of South China
Advanced Materials Research | Year: 2012

Silver powder and silver-tin oxide composite powder were synthesized by hydrothermal method. The powders were characterized by XRD and SEM. The results show that there are macroscopic appearance and microscopic structure differences between two kinds of powders. Silver powder is gray and spherical particles with 3μm diameter, and silver-tin oxide composite powder is black ash and mainly flake particles about 0.3μm in thickness. Silver crystal in silver tin-oxide composite powder is preferentially oriented in the (111) crystal plane and its oriented index is 2.581. However oriented index of silver crystal in silver powder is 1.048 which shows the crystal isn't preferentially oriented in the (111) crystal plane. That crystal lattice parameter of silver crystal in silver tin oxide composite powder is 0.409 34 nm larger than 0.408 68 nm of silver powder. The mechanism analysis shows that the hydrogen bonds among Sn(OH) 6 2- and Ag(SO 3) 2 3- complexes are inhere factor which result in the formation of flake silver tin-oxide composite powder.

Zhao W.,Jiangsu University | Cheng M.,Nanjing Southeast University | Chau K.T.,University of Hong Kong | Cao R.,Nanjing Southeast University | Ji J.,Jiangsu University
IEEE Transactions on Industrial Electronics | Year: 2013

Redundant flux-switching permanent-magnet (R-FSPM) motors are a new class of brushless machines having magnets in the stator, offering high power density, simple and robust rotor structure, and good thermal dissipation conditions. This paper proposes a new control strategy for fault-tolerant operation of the R-FSPM motor drive considering the capability limitation of the power converter. The key is to operate the R-FSPM motor in the remedial mode by injecting harmonic currents, the so-called remedial injected-harmonic-current (RIHC) operation mode. Moreover, the motor losses at the existing and the proposed remedial operations are compared for evaluation. Both cosimulation and experimental results are presented, confirming that the proposed RIHC operation can offer good steady-state and dynamic performances while reducing the motor losses and the capability requirements of the power converter during fault. © 2012 IEEE.

Zhao W.X.,Jiangsu University | Cheng M.,Nanjing Southeast University | Chau K.T.,University of Hong Kong | Chan C.C.,University of Hong Kong
IET Electric Power Applications | Year: 2012

This study investigates the operations of a recently developed fault-tolerant flux-switching permanent-magnet (FT-FSPM) brushless motor, in which the concentrated coils of each stator phase are wound on alternate teeth and permanent-magnets (PMs) are located in the stator, offering a number of significant advantages over conventional PM brushless machines, such as simpler rotor structure, easier cooling in PMs and independence of phases. The control strategy of the FT-FSPM motor is proposed for torque ripple minimisation, in which the key is to introduce harmonic currents to compensate for non-ideal sinusoidal back-electromotive force (EMF). Both simulation and experimental results confirm that the proposed control algorithms can reduce torque ripple and offer good dynamic performance under normal and fault conditions. Hence, it can be concluded that the developed motor drive system is suitable for applications where reliability, efficiency and power density are of importance in such applications as electric and hybrid electric vehicles. © 2012 The Institution of Engineering and Technology.

Sun G.,Nanjing Southeast University | Sun G.,University of Michigan | Zhou R.,Jiangsu University of Science and Technology | Lu J.,Jiangsu University | Mazumder J.,University of Michigan
Acta Materialia | Year: 2015

Laser-aided direct metal deposition (DMD) was used to form a AISI 4340 steel coating on an AISI 4140 steel substrate. Stress in the coating was relieved before mechanical testing. The defect density and microstructural property of the DMD coating were analyzed. The thermal analysis, continuous cooling transformation (CCT), residual stress, micro-hardness, nano-hardness and elastic modulus of the DMD coating before and after stress relief were studied. Tensile testing, lap shear testing and bend testing were done on the stress-relieved DMD coatings. Finally, evaluation of the effect of porosity on fracture behavior was characterized. A porosity and residual stress-based fracture mechanism was proposed. A better deposition strategy is needed to improve the microstructure (decrease porosity), and the mechanical properties of DMD could be tailored through appropriate heat treatments. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Sun B.,Jiangsu University | Chen M.-Y.,Jiangsu University | Zhou J.,Ningbo University | Zhang Y.-K.,Nanjing Southeast University
Plasmonics | Year: 2013

The polarization characteristics of a dual-core photonic crystal fiber (PCF) with a metal wire filled into the cladding air hole between the two cores have been investigated. Numerical investigation shows that the inclusion of the metal wire greatly changes the coupling characteristics of the modes in the two cores. In fact, the coupling lengths of the two polarizations show increased difference, which leads to the possibility of designing a dual-core PCF with a coupling length ratio of 1:2 for the two polarization states. The proposed polarization splitter shows extinction ratios as low as -20 dB with bandwidths as great as 146 nm. © 2013 Springer Science+Business Media New York.

Guan X.,Jiangsu University | Li Y.,Shaanxi Normal University | Feng F.,Xian University of Posts and Telecommunications
Soft Computing | Year: 2013

In this paper, a new order relation on fuzzy soft sets, called soft information order, is introduced and its application to decision-making is investigated. It is shown that the collection of all fuzzy soft sets (over a given universe set), equipped with this new order, forms a complete Heyting algebra. The representation theorem of fuzzy soft sets with respect to the soft information order is also obtained. We initiate the concepts of soft set satisfaction problems and their solutions. An algorithm is presented to solve such decision-making problems. © 2012 Springer-Verlag.

Ding S.,Jiangsu University | Li S.,Nanjing Southeast University | Zheng W.X.,University of Western Sydney
Automatica | Year: 2012

A global nonsmooth stabilization scheme is presented for a class of nonlinear cascaded systems with uncontrollable linearization. A stepwise constructive control methodology is proposed for the driving subsystem by using the adding a power integrator technique. Under suitable conditions and based on homogeneous properties, it is proved that the stabilization of the driving subsystem implies the stabilization of the overall cascaded system. Due to the versatility of the adding a power integrator technique and homogeneous properties, the proposed controller not only can be used to stabilize the cascaded system asymptotically, but also is able to lead to an interesting result of finite-time stabilization under appropriate conditions. © 2012 Elsevier Ltd. All rights reserved.

Du H.,Nanjing Southeast University | Du H.,Hefei University of Technology | Li S.,Nanjing Southeast University | Ding S.,Jiangsu University
Asian Journal of Control | Year: 2013

In this paper, the consensus problem is investigated via bounded controls for the multi-agent systems with or without communication. Based on the nested saturation method, the saturated control laws are designed to solve the consensus problem. Under the designed saturated control laws, the transient performance of the closed-loop system can be improved by tuning the saturation level. First of all, asymptotical consensus algorithms with bounded control inputs are proposed for the multi-agent systems with or without communication delays. Under these consensus algorithms, the states' consensus can be achieved asymptotically. Then, based on a kind of novel nonlinear saturation functions, bounded finite-time consensus algorithms are further developed. It is shown that the states' consensus can be achieved in finite time. Finally, two examples are given to verify the efficiency of the proposed methods. © 2012 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.

Zhao W.,Jiangsu University | Chau K.T.,University of Hong Kong | Cheng M.,Nanjing Southeast University | Ji J.,Jiangsu University | Zhu X.,Jiangsu University
IEEE Transactions on Industrial Electronics | Year: 2010

The doubly salient permanent-magnet (DSPM) machine is a new class of stator-PM brushless machines, which inherently offers the fault-tolerant feature. In this paper, a new operation strategy is proposed and implemented for fault-tolerant DSPM motor drives. The key is to operate the DSPM motor drive in a remedial brushless ac (BLAC) mode under the open-circuit fault condition, while operating in the conventional brushless dc mode under normal condition. Both cosimulation and experimental results confirm that the proposed remedial BLAC operation can maintain the average torque, reduce the torque ripple, and retain the self-starting capability under the open-circuit fault. © 2006 IEEE.

Zhu X.,Nanjing Southeast University | Zhu X.,Jiangsu University | Cheng M.,Nanjing Southeast University
Science China Technological Sciences | Year: 2010

In this paper, a new hybrid excited doubly salient stator-permanent-magnet motor is proposed, where both permanent magnets and DC field windings are located in the stator. In theory, the mathematical model and design method of the motor are developed. The corresponding output power equation and the relationship between the flux control capability and the extended speed range are deduced in details. By using an efficient "one-step" three-dimensional (3D) finite element method, the electromagnetic performances are analyzed, in which the leakage flux outside the stator circumference and end-effect are taken into account. Based on the operation principle of the motor, the control strategy and scheme are developed and implemented experimentally. Both experimental results and finite element analysis show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors, but also offers high energy efficiency over a wide speed range, which makes the motor an interesting candidate for electric vehicles. © 2010 Science in China Press and Springer Berlin Heidelberg.

Liu R.,Nanjing Southeast University | Li S.,Nanjing Southeast University | Ding S.,Jiangsu University
Transactions of the Institute of Measurement and Control | Year: 2012

This paper presents a new control strategy for overhead crane systems. First, by utilizing a coordinate change, the underactuated overhead crane dynamical model can be transformed into an upper-triangular form. Second, a finite-time controller is designed based on the nonlinear nested saturation and adding a power integrator technique. Rigorous proof shows that the controller can guarantee finite-time stability of the closed-loop system. Simulations show the effectiveness of the proposed method. © The Author(s) 2011.

Liu Y.,Jiangsu University | Zhang J.,Nanjing Southeast University | Pan J.,Jiangsu University
Energy and Fuels | Year: 2014

In the present study, the process of photochemical oxidation removal of Hg0 from a flue gas containing SO2/NO, using ultraviolet irradiation and hydrogen peroxide (UV/H2O2), was investigated in a photochemical gas-liquid reactor. The effects of some important parameters, such as H2O2 concentration, UV radiated power per unit solution, solution pH, Hg0 concentration, solution temperature, flue gas flow, SO2 concentration, NO concentration, and O2 concentration on the removal of Hg0 using the UV/H2O2 process were investigated. The simultaneous removal of Hg0, NO, and SO2 via the UV/H 2O2 and UV/H2O2/Ca(OH)2 processes is studied preliminarily. In addition, the removal mechanism of Hg0 via the UV/H2O2 process is also proposed. The results show that O2 and UV radiation have a significant role in promoting the removal of Hg0. The removal of Hg0 is significantly promoted by adding a low concentration of H2O 2, but it is inhibited by adding a high concentration of H 2O2. The removal efficiency of Hg0 is significantly reduced as the Hg0 concentration, flue gas flow, or solution pH is increased, but it is only slightly reduced with increased solution temperature, SO2 concentration, or NO concentration. Hg 0, NO, and SO2 can be simultaneously removed effectively using UV/H2O2/Ca(OH)2 processes. Hg 2+ is the final reaction product of Hg0 removal, and Hg0 is mainly removed by the oxidations of H2O 2, ·OH,·O, and O3, as well as UV photoexcitation. © 2014 American Chemical Society.

Cao R.,Nanjing Southeast University | Cao R.,University of Michigan | Cheng M.,Nanjing Southeast University | Mi C.,University of Michigan | And 3 more authors.
IEEE Transactions on Energy Conversion | Year: 2012

In this paper, a complementary and modular linear flux-switching permanent magnet (MLFSPM) motor is investigated, in which both the magnets and armature windings are placed in the short mover, while the long stator consists of iron core only. The proposed MLFSPM motor incorporates the high power density of a linear permanent magnet synchronous motor and the simple structure of a linear induction motor. It is especially suitable for long stator applications such as urban rail transit. The objective of this paper is to build the mathematical model for the purpose of control of this motor. The simulation results by means of finite-element analysis (FEA) verified the theoretical analysis and the effectiveness of this model. Both the analytical model and the FEA results are validated by experiments based on a prototype motor. © 2012 IEEE.

Huang Z.,Jiangsu University | Zhong P.,Jiangsu University | Wang C.,Jiangsu University | Zhang X.,Shanghai Key Laboratory of Modern Optical Systems | Zhang C.,Jiangsu University
ACS Applied Materials and Interfaces | Year: 2013

The top of silicon nanowires (SiNWs) arrays was coated with reduced graphene oxide (rGO) by the facile spin-coating method. The resulting SiNWs/rGO composite exhibits enhanced photoelectrochemical properties, with short-circuit photocurrent density more than 4 times higher than that of the pristine SiNWs and more than 600 times higher than that of planar Si/rGO composite. The trapping and recombination of photogenerated carriers at the surface state of SiNWs were reduced after the application of rGO. The results of electrochemical impedance spectroscopy measurements suggest that the reduction of trapping and recombination of photogenerated carriers as well as remarkably enhancement of photoelectrochemical properties can be attributed to the low charge transfer resistance at the SiNWs-rGO interface and rGO-electrolyte interface. The method and results shown here indicate a convenient and applicable approach to further exploitation of high activity materials for photoelectrochemical applications. © 2013 American Chemical Society.

Liu J.,Jiangsu University | Chen K.,Jiangsu University | Wang J.-H.,CAS Institut Pasteur of Shanghai | Zhang C.,Jiangsu University
PLoS ONE | Year: 2010

Background: Tetherin is a recently identified antiviral restriction factor that restricts HIV-1 particle release in the absence of the HIV-1 viral protein U (Vpu). It is reminiscent of APOBEC3G and TRIM5a that also antagonize HIV. APOBEC3G and TRIM5a have been demonstrated to evolve under pervasive positive selection throughout primate evolution, supporting the red-queen hypothesis. Therefore, one naturally presumes that Tetherin also evolves under pervasive positive selection throughout primate evolution and supports the red-queen hypothesis. Here, we performed a detailed evolutionary analysis to address this presumption. Methodology/Principal Findings: Results of non-synonymous and synonymous substitution rates reveal that Tetherin as a whole experiences neutral evolution rather than pervasive positive selection throughout primate evolution, as well as in non-primate mammal evolution. Sliding-window analyses show that the regions of the primate Tetherin that interact with viral proteins are under positive selection or relaxed purifying selection. In particular, the sites identified under positive selection generally focus on these regions, indicating that the main selective pressure acting on the primate Tetherin comes from virus infection. The branch-site model detected positive selection acting on the ancestral branch of the New World Monkey lineage, suggesting an episodic adaptive evolution. The positive selection was also found in duplicated Tetherins in ruminants. Moreover, there is no bias in the alterations of amino acids in the evolution of the primate Tetherin, implying that the primate Tetherin may retain broad spectrum of antiviral activity by maintaining structure stability. Conclusions/Significance: These results conclude that the molecular evolution of Tetherin may be attributed to the host-virus arms race, supporting the Red Queen hypothesis, and Tetherin may be in an intermediate stage in transition from neutral to pervasive adaptive evolution. © 2010 Liu et al.

Wang J.,Jiangsu University | Xu J.,Nanjing Southeast University | Zhang F.,Nanjing Southeast University | Chen X.,Jiangsu University
Nonlinearity | Year: 2013

In this paper, we study the existence of multi-bump solutions for the semilinear Schrödinger-Poisson system ∫δu + u + εψ(x)a(x)u = (1 - εb(x))|u|p-1u, x ∈ ℝ3-δψ = a(x)u2, x ∈ ℝ3 where p ∈ (1, 5), a, b ∈ C(ℝ3) and a(x) > 0, b(x) > 0 inR3. For any positive integer K, we prove that there exists ε(K) > 0 such that, for 0 < ε < ε(K), the system has a K-bump solution. Then the equation has more and more multi-bump solutions as ε → 0. © 2013 IOP Publishing Ltd & London Mathematical Society.

Guan X.,Jiangsu University | Li Y.,Shaanxi Normal University
International Journal of Uncertainty, Fuzziness and Knowlege-Based Systems | Year: 2012

In this paper (strong) continuity of domain-free information algebras and labeled information algebras are introduced. Relationships between domain-free information algebras and labeled information algebras are mainly explored. It is shown that continuity and compactness can be preserved under certain canonical correspondences between domain-free information algebras and labeled information algebras. Some equivalent characterizations and examples for continuous information algebras are also given. © 2012 World Scientific Publishing Company.

Cao S.,Jiangsu University | Fang L.,Jiangsu University | Zhao Z.,Jiangsu University | Ge Y.,Cranfield University | And 3 more authors.
Advanced Functional Materials | Year: 2013

In this work, the first example of a hierarchically structured hollow silica system is reported without any chemical modification to the enzyme involved in the process. The leaching of the physically adsorbed enzyme is substantially restrained in comparison to pure hollow silica supports. The hierarchical architecture is composed of the ordered hollow silica spheres with a shell-in-shell structure. This rationally integrated architecture, which serves as the host for glucose oxidase immobilization, displays many significant advantages, including increases in mechanical stability, enzyme loading, and bioactivity, and a decrease in enzyme leaching compared to existing pure hollow silica matrices. This facilitates further multifarious applications for enhanced enzyme immobilization, biosensors, and biocatalysis. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Wenzhou University, Jiangsu University and Nanjing Southeast University | Date: 2013-10-23

A laser shock peening method and device for a bottom surface of a tenon groove of an aircraft blade. During the laser shock peening process, according to geometric characteristics of the bottom surface of a tenon groove, a circular facula of a laser beam is changed into a strip-shaped facula, at the same time as a flow-guiding injection device and a water pumping device are respectively arranged at two end surfaces of the bottom surface of the tenon groove to ensure the stability of a water confinement layer.

Beijing Institute of Technology, Nanjing Southeast University and Jiangsu University | Date: 2013-05-21

A method and an apparatus for injecting a water restraint layer of a laser shock processing blade, including a laser device distance measuring instrument platform bracket distance measuring instrument controller I, and water tap transition joint, signal wires, hose, and water tank. A standard curved section corresponding to two probe points I, and a point to be processed, on a vertical section along a laser beam direction on the blade is used for approximately replacing an actual curved section on the blade, so that a water flow flows into the blade from a middle point of the standard curved section approximately as a middle point of the actual curved section, and the long side of a flat nozzle is parallel to the tangent plane of the point to be processed of the blade through the controller according to feedback information of the distance measuring instrument.

Wenzhou University, Jiangsu University and Nanjing Southeast University | Date: 2013-10-23

A method and device for strengthening the laser shock of a hidden surface includes establishing a continuous laser shock strengthening track and process after acquiring the information about the whole hidden surface. A control system adjusts the movement and rotation of a total reflection mirror which is arranged in a workpiece according to the signal from signal collecting cards for making a reflected laser beam act on a region to be machined of the hidden surface at an appropriate incidence angle. The method can realize the surface strengthening treatment of the hidden surface of the workpiece, significantly improve the mechanical performance of the workpiece and increase the fatigue life thereof, which is applicable to the surface strengthening of the workpiece with the hidden surface.

Liu X.,Jiangsu University | Liu X.,Nanjing Southeast University | Cao J.,Nanjing Southeast University | Yu W.,Nanjing Southeast University | Yu W.,RMIT University
Chaos | Year: 2012

This paper is concerned with the quasi-synchronization issue of linearly coupled networks with discontinuous nonlinear functions in each isolated node. Under the framework of Filippov systems, the existence and boundedness of solutions for such complex networks can be guaranteed by the matrix measure approach. A design method is presented for the synchronization controllers of coupled networks with non-identical discontinuous systems. Moreover, a sufficient condition is derived to ensure the quasi-synchronization of switched coupled complex networks with discontinuous isolated nodes, which could be controlled by some designed linear controllers. The obtained results extend the previous work on the synchronization issue of coupled complex networks with Lipschitz continuous conditions. Numerical simulations on the coupled chaotic systems are given to demonstrate the effectiveness of the theoretical results. © 2012 American Institute of Physics.

Ding S.-H.,Jiangsu University | Li S.-H.,Nanjing Southeast University
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2011

By utilizing finite-time control technique, a global finite-time control scheme is proposed for a class of nonlinear integrator systems subject to input saturation. First of all, based on finite-time Lyapunov stability theory, a global finite-time recursive stabilizing controller is presented. Then by combining the saturated function with the recursive controller, a saturated controller is developed. Rigorous mathematical proof shows that under the saturated controller, the closed loop system is globally finite-time stable. Simulation results verify the effectiveness of the proposed method. Copyright © 2011 Acta Automatica Sinica. All rights reserved.

Chen P.,University of Houston | Finikova O.S.,University of Pennsylvania | Ou Z.,University of Houston | Ou Z.,Jiangsu University | And 2 more authors.
Inorganic Chemistry | Year: 2012

Fourteen platinum(II) porphyrins with different π-conjugated macrocycles and different electron-donating or electron-withdrawing substituents were investigated as to their electrochemical and spectroscopic properties in nonaqueous media. Eight compounds have the formula (Ar 4P)Pt II, where Ar 4P = the dianion of a tetraarylporphyrin, while six have π-extented macrocycles with four β,β′-fused benzo or naphtho groups and are represented as (TBP)Pt II and (TNP)Pt II where TBP and TNP are the dianions of tetrabenzoporphyrin and tetranaphthoporphyrin, respectively. Each Pt(II) porphyrin undergoes two reversible one-electron reductions and one to three reversible one-electron oxidations in nonaqueous media. These reactions were characterized by cyclic voltammetry, UV-visible thin-layer spectroelectrochemistry and in some cases by ESR spectroscopy. The two reductions invariably occur at the conjugated π-ring system to yield relatively stable Pt(II) π-anion radicals and dianions. The first oxidation leads to a stable π-cation radical for each investigated porphyrin; but in the case of tetraarylporphyrins containing electron-withdrawing substituents, the product of the second oxidation may undergo an internal electron transfer to give a Pt(IV) porphyrin with an unoxidized macrocycle. The effects of macrocycle structure on UV-visible spectra, oxidation/reduction potentials, and site of electron transfer are discussed. © 2012 American Chemical Society.

Wang M.,Jiangsu University | Zhou Y.,Jiangsu University | Zhang Y.,Jiangsu University | Jung Kim E.,University of Ulsan | And 2 more authors.
Applied Physics Letters | Year: 2012

Understanding the defect physics of ZnO is crucial in controlling its properties for various applications. We report the observation of an interesting 1.64 eV near-infrared (NIR) photoluminescence from ZnO and its evolution with annealing temperature. Based on a recent calculation on the transition levels of native point defects of ZnO [A. Janotti and C. G. Van de Walle, Phys. Rev. B 76, 165202 (2007)], the NIR emission can be successfully explained by the donor-acceptor transition between V O and V Zn and/or the radiative recombination of shallowly trapped electrons with deeply trapped holes at O i. © 2012 American Institute of Physics.

Xu H.,Jiangsu University | Yan J.,Jiangsu University | Xu Y.,Jiangsu University | Song Y.,Jiangsu University | And 4 more authors.
Applied Catalysis B: Environmental | Year: 2013

Novel visible-light-driven AgX/g-C3N4 (X=Br, I) hybrid materials were synthesized by the facile water bath method. The AgX/g-C3N4 hybrid materials were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), Fourier transform infrared spectra (FTIR), Raman and the special surface area. The XRD, EDS, TEM, FTIR, Raman and XPS analyses indicated that AgX nanoparticles were evenly distributed on the surface of g-C3N4 and the heterostructures were formed. The photocatalytic activity of the AgX/g-C3N4 hybrid materials was evaluated using methyl orange as a target organic pollutant. The as-prepared AgX/g-C3N4 hybrid materials displayed much higher photocatalytic activity than the pure g-C3N4 and AgX nanoparticles. After the introduction of AgX nanoparticles, the photocurrent of the AgBr/g-C3N4 and AgI/g-C3N4 hybrid materials was found to increase by 21 and 8 times than that of the pure g-C3N4, respectively. The increased photocatalytic activity of the AgX/g-C3N4 hybrid materials was attributed to the synergic effect between g-C3N4 and AgX, which included the optical property, the better dispersion and the small size. A photocatalytic mechanism and the kinetics of AgX/g-C3N4 hybrid materials were also proposed. © 2012 Elsevier B.V.

Miao X.,Jiangsu University | Guo X.,Sun Yat Sen University | Xiao Z.,Sun Yat Sen University | Ling L.,Sun Yat Sen University
Biosensors and Bioelectronics | Year: 2014

Direct recognition of double-stranded DNA (dsDNA) was crucial to disease diagnosis and gene therapy, because DNA in its natural state is double stranded. Here, a novel sensor for the sequence-specific recognition of dsDNA was developed based on the structure change of ferrocene (Fc) redox probe modified molecular beacon (MB). For constructing such a sensor, gold nanoparticles (AuNPs) were initially electrochemical-deposited onto glass carbon electrode (GCE) surface to immobilize thiolated MB in their folded states with Au-S bond. Hybridization of MB with target dsDNA induced the formation of parallel triplex DNA and opened the stem-loop structure of it, which resulted in the redox probe (Fc) away from the electrode and triggered the decrease of current signals. Under optimal conditions, dsDNA detection could be realized in the range from 350. pM to 25. nM, with a detection limit of 275. pM. Moreover, the proposed method has good sequence-specificity for target dsDNA compared with single base pair mismatch and two base pairs mismatches. © 2014 Elsevier B.V.

Zhang L.,Jiangsu University | Tu K.N.,University of California at Los Angeles
Materials Science and Engineering R: Reports | Year: 2014

Composite lead-free solders, containing micro and nano particles, have been widely studied. Due to grain boundary drag or Zener drag, these particles can refrain the solder microstructure from coarsening in services, especially for Cu6Sn5, Ag3Sn intermetallic compounds and the β-Sn phases. Due to dispersion hardening or dislocation drag, the mechanical properties of the composite solder alloys were enhanced significantly. Moreover, these particles can influence the rate of interfacial reactions, and some particles can transform into a layer of intermetallic compound. Wettability, creep resistance, and hardness properties were affected by these particles. A systematic review of the development of these lead-free composite solders is given here, which hopefully may find applications in microbumps to be used in the future 3D IC technology.

Li Y.,Jiangsu University | Li Y.,University of Saskatchewan | Hao J.,Jiangsu University | Liu H.,University of Saskatchewan | And 4 more authors.
Physical Review Letters | Year: 2015

The pressure-induced transformation of diatomic nitrogen into nonmolecular polymeric phases may produce potentially useful high-energy-density materials. We combine first-principles calculations with structure searching to predict a new class of nitrogen-rich boron nitrides with a stoichiometry of B3N5 that are stable or metastable relative to solid N2 and h-BN at ambient pressure. The most stable phase at ambient pressure has a layered structure (h-B3N5) containing hexagonal B3N3 layers sandwiched with intercalated freely rotating N2 molecules. At 15 GPa, a three-dimensional C2221 structure with single N-N bonds becomes the most stable. This pressure is much lower than that required for triple-to-single bond transformation in pure solid nitrogen (110 GPa). More importantly, C2221-B3N5 is metastable, and can be recovered under ambient conditions. Its energy density of ∼3.44kJ/g makes it a potential high-energy-density material. In addition, stress-strain calculations estimate a Vicker's hardness of ∼44GPa. Structure searching reveals a new clathrate sodalitelike BN structure that is metastable under ambient conditions. © 2015 American Physical Society.

Errea I.,Donostia International Physics Center | Errea I.,Ikerbasque | Calandra M.,French National Center for Scientific Research | Pickard C.J.,University College London | And 7 more authors.
Physical Review Letters | Year: 2015

We use first-principles calculations to study structural, vibrational, and superconducting properties of H2S at pressures P≥200GPa. The inclusion of zero-point energy leads to two different possible dissociations of H2S, namely 3H2S→2H3S+S and 5H2S→3H3S+HS2, where both H3S and HS2 are metallic. For H3S, we perform nonperturbative calculations of anharmonic effects within the self-consistent harmonic approximation and show that the harmonic approximation strongly overestimates the electron-phonon interaction (λ≈2.64 at 200 GPa) and Tc. Anharmonicity hardens HS bond-stretching modes and softens HS bond-bending modes. As a result, the electron-phonon coupling is suppressed by 30% (λ≈1.84 at 200 GPa). Moreover, while at the harmonic level Tc decreases with increasing pressure, the inclusion of anharmonicity leads to a Tc that is almost independent of pressure. High-pressure hydrogen sulfide is a strongly anharmonic superconductor. © 2015 American Physical Society.

Li Y.,Jiangsu University | Li Y.,Jilin University | Wang Y.,Jilin University | Pickard C.J.,University College London | And 3 more authors.
Physical Review Letters | Year: 2015

Alkali metals exhibit unexpected structures and electronic behavior at high pressures. Compression of metallic sodium (Na) to 200 GPa leads to the stability of a wide-band-gap insulator with the double hexagonal hP4 structure. Post-hP4 structures remain unexplored, but they are important for addressing the question of the pressure at which Na reverts to a metal. Here, we report the reentrant metallicity of Na at the very high pressure of 15.5 terapascal (TPa), predicted using first-principles structure searching simulations. Na is therefore insulating over the large pressure range of 0.2-15.5 TPa. Unusually, Na adopts an oP8 structure at pressures of 117-125 GPa and the same oP8 structure at 1.75-15.5 TPa. The metallization of Na occurs on the formation of a stable and striking body-centered cubic cI24 electride structure consisting of Na12 icosahedra, each housing at its center about one electron that is not associated with any Na ions. © 2015 American Physical Society.

Wang P.,Sun Yat Sen University | Wang P.,Jiangsu University | Wu H.,Sun Yat Sen University | Dai Z.,Sun Yat Sen University | Zou X.,Sun Yat Sen University
Chemical Communications | Year: 2012

An efficient electrochemical approach is developed for ultrasensitive profiling of the methylation status of the p53 tumor suppressor gene based on a label-free biosensor in combination with bisulfite conversion. © 2012 The Royal Society of Chemistry.

Cui C.Y.,Jiangsu University | Cui X.G.,Jiangsu University | Ren X.D.,Jiangsu University | Liu T.T.,Jiangsu University | And 2 more authors.
Materials and Design | Year: 2013

The butt welding of 304 stainless steel plates with thickness of 3. mm and 6. mm were achieved by YLR-6000 fiber laser under Ar protective gas. The weld appearance, microstructure, composition distribution and microhardness of welded joint were emphatically investigated. The results showed that the narrow and fully penetrated welded joint without marco-defects can be obtained with tightly focused 2. kW fiber laser power and 20. mm/s welding speed. The weld bead was smooth, and various microstructures typically formed at different zones of the welded joint. The fine columnar and equiaxed crystals existed in the edge and center of weld bead, respectively. Both were different with the microstructure of the stainless steel substrate. However, the composition distribution of the welded joint had no obvious changes. Furthermore, the superior microhardness of welded joint over the stainless steel substrate was mainly attributed to its finer microstructure. © 2013 Elsevier Ltd.

Wu L.,Tsinghua University | Zhu J.,Jiangsu University | Xie H.,Tsinghua University
Journal of Thermal Spray Technology | Year: 2014

Thermal barrier coating (TBC) system is widely used in modern gas turbines to protect the internals and enable them to service in higher temperature environment. Residual stress in the TBC system can be induced during its production procedure, such as air plasma spraying (APS) process, and affect its performance to a large extent. The temperature history and the evolution of residual stress in the TBC system during APS process were studied in this paper by finite element simulation and hole-drilling experiment. A five-layered TBC specimen model was established, and a thermo-mechanical-coupled analysis was conducted in the simulation. The "modified element birth-death technique" was used to represent the formation of TBC. In addition, experimental validation of the simulation result was carried out on a TBC specimen using hole-drilling technique combined with moiré interferometry. The experimental data agreed well with the simulation results and the study of this paper could provide a reference for the production of the TBC system. © 2014 ASM International.

Bai S.,Jiangsu University | Chen S.,University of Technology, Sydney | Shen X.,Jiangsu University | Zhu G.,Jiangsu University | Wang G.,University of Technology, Sydney
RSC Advances | Year: 2012

Nanocomposites of Fe2O3 nanospindles with crumpled reduced graphene oxide (RGO) nanosheets were prepared using a facile solvothermal synthesis method. The RGO-Fe2O3 nanocomposite with about 24.4 wt% RGO demonstrated an excellent electrochemical performance as a promising anode material for lithium-ion batteries (LIBs), which achieved a high reversible capacity of 969 mA h g-1 after 100 cycles at a current density of 100 mA g-1 (0.1 C). Furthermore, it also exhibited a large capacity of 336 mA h g-1 after 100 cycles at the high rate of 5 C. The cycling performance and reversible capacities of the RGO-Fe 2O3 composites were much better than those of bare Fe 2O3 nanospindles and pure RGO nanosheets, as well as previously reported RGO-Fe2O3 nanocomposites. The enhanced performance towards lithium storage can be ascribed to the crumpled RGO nanosheets, which may act as efficient volume buffer and electron conductor in the composites. The strategy proposed here could be extended to produce other nanocomposites based on crumpled graphene nanosheets for various applications. © 2012 The Royal Society of Chemistry.

Lin Y.-L.,Jiangsu University | Xie P.-G.,Sun Yat Sen University | Wang L.,Hebei University of Engineering | Ma J.-G.,Hebei Medical University
Medical Science Monitor | Year: 2014

Background: Aberrant methylation of protocadherin 17 (PCDH17) has been reported in several human cancers. However, the methylation status of PCDH17 in prostate cancer and its clinical significance remains unclear. The aim of this study was to investigate the methylation status of PCDH17 and its clinical significance in patients with prostate cancer after radical prostatectomy. Material/Methods: The methylation status of PCDH17 in 152 prostate cancer tissues and 51 non-tumoral prostate tissues was examined by methylation-specific PCR (MSP). Then the association between PCDH17 methylation and clinicopathologic parameters was analyzed. Kaplan-Meier survival analysis, log-rank test and multivariate Cox proportional hazard model analysis were used to analyze the correlation between PCDH17 methylation and prognosis of patients with prostate cancer. Results: Our data demonstrated that PCDH17 methylation occurred frequently in prostate cancer. PCDH17 methylation was significantly associated with higher pathological Gleason score (P=0.0315), advanced pathological stage (P=0.0260), higher level of preoperative PSA (P=0.0354), positive angiolymphatic invasion (P=0.0461), positive lymph node metastasis (P=0.0362), and biochemical recurrence (BCR) (P=0.0018). In addition, PCDH17 methylation was an independent predictor of poor biochemical recurrence-free (BCR-free) survival and overall survival for patients with prostate cancer. Conclusions: PCDH17 methylation is a frequent tumor-specific event in prostate cancer, and is significantly correlated with shorter BCR-free survival and overall survival of patients with prostate cancer after radical prostatectomy. PCDH17 methylation in tumor samples after radical prostatectomy may be used as an independent prognostic biomarker. © Med Sci Monit, 2014.

Li H.,Jiangsu University | Yang J.,Jiangsu University | Zhang J.,Food Inspection Center | Zhou M.,Jiangsu University | Zhou M.,Tsinghua University
RSC Advances | Year: 2012

The fabrication of a photodetector and gas sensor based on hierarchical Bi 2S 3 nanostructures is reported. Single crystalline Bi 2S 3 nanostructures with [001] growth direction were obtained via a facile hydrothermal method without any templates or surfactants. The photodetector showed steady photoresponses with a fast response time of ∼50 ms. Moreover, these Bi 2S 3 nanostructures exhibited a good sensing to methanol. These results show these hierarchical Bi 2S 3 nanostructures are promising candidates for constructing optoelectronic and gas sensing devices. This journal is © 2012 The Royal Society of Chemistry.

Lin Y.-L.,Jiangsu University | Xie P.-G.,Sun Yat Sen University | Ma J.-G.,Hebei Medical University
Medical Science Monitor | Year: 2014

Background: CDH13 is a novel tumor suppressor gene often inactivated by aberrant promoter methylation in human cancers. Previous studies have shown that CDH13 methylation correlated with advanced disease and poor prognosis in non-muscle invasive bladder cancer (NMIBC). The aim of the current study was to investigate the correlations between CDH13 methylation and disease recurrence as well as progression of NMIBC.Material/Methods: The methylation status of CDH13 in 178 NMIBC samples and 38 normal bladder epithelial tissues was examined by methylation-specific PCR (MSP), and then correlated with clinicopathological features.Results: We found that CDH13 methylation occurs frequently in NMIBC, and significantly correlates with high grade, advanced stage, larger tumor size, and tumor recurrence and progression. Moreover, patients with methylated CDH13 exhibited significantly shorter recurrence-free survival (P<0.0001) and progression-free survival (P=0.0060) than patients with unmethylated CDH13. In addition, a multivariate Cox proportional hazard model analysis suggests that CDH13 methylation is an independent predictor for the recurrence (P=0.0043) and progression (P=0.0016) of NMIBC after initial transurethral resection.Conclusions: Our findings demonstrate that CDH13 methylation is a frequent event in NMIBC, and is associated with unfavorable tumor features. It should be used as an independent predictor for the recurrence and progression of NMIBC, and may be useful for the design of individualized therapeutic modalities. © Med Sci Monit, 2014.

Liu C.,Gannan Normal University | Liu C.,Tongji University | Miao D.,Tongji University | Qian J.,Jiangsu University
International Journal of Approximate Reasoning | Year: 2014

Recently, much attention has been given to multi-granulation rough sets (MGRS) and different kinds of multi-granulation rough set models have been developed from various viewpoints. In this paper, we propose four types of multi-granulation covering rough set (MGCRS) models under covering approximation space, where a target concept is approximated by employing the maximal or minimal descriptors of objects in a given universe of discourse U. And then, we investigate a number of basic properties of the four types of MGCRS models, and discuss the relationships and differences among the classical MGRS model and our MGCRS models. Moreover, the conditions for two distinct MGCRS models which produce identical lower and upper approximations of a target concept in a covering approximation space are also studied. Finally, the relationships among the four types of MGCRS models are explored. We find that for any subset X⊆U, the lower approximations of X and the upper approximations of X under the four types of MGCRS models can construct a lattice, if we consider the binary relation of inclusion. © 2014 Elsevier Inc. All rights reserved.

Zhang L.,Jiangsu University | Zhang L.,University of California at Los Angeles | Fan X.-Y.,Jiangsu University | Guo Y.-H.,Jiangsu University | He C.-W.,Jiangsu University
Materials and Design | Year: 2014

In order to enhance the properties of SnAgCu lead-free solders in microelectronic packaging, various contents of rare earth Yb were incorporated into the alloys. Results indicated that the addition of Yb can improve the wettability, tensile strength, thermal fatigue behavior of lead-free alloys. The lead-free solder with 0.05%Yb addition exhibited the best comprehensive properties as compared to the alloys with other Yb weight fractions. And found that after soldering, the initial interfacial IMC thickness of SnAgCuYb solder joint was smaller than that of SnAgCu solder joints, and this signified that the addition of Yb was effective in retarding the growth of the IMC layer. In addition, the Yb can refine the microstructures of SnAgCu solder, excessive Yb added can form bulk Sn-Yb phase and deteriorate the properties. © 2014 Elsevier Ltd.

Yan Z.,Jiangsu University | Yan Z.,Sun Yat Sen University | He G.,Sun Yat Sen University | Shen P.K.,Sun Yat Sen University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2014

Molybdenum carbide (MoC or Mo2C) nanoparticles down to 2 nm in size on carbon (C-MoxC) are synthesized through an ion exchange process, and used as a Pt electrocatalyst support for both the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). XRD, Raman spectrometer, TEM and XPS measurements are used to characterize the structure and properties of the synthesized materials. The results show that the typical Pt/C-MoC exhibits 160 mV negative shift in onset potential for the MOR, and 2.3 times kinetic mass current (276.7 mA mgPt -1) for the ORR compared to commercial Pt/C-TKK. The large improvement in the catalytic activity resulted from the synergistic effect and binding effect between Pt and MoC. The results also show that MoC promotes both the activity and stability of the Pt electrocatalyst to a greater extent than Mo2C, owing to the different synergistic effect and binding energy. In addition, the Mo compound was found to have an obvious catalytic effect on the graphitization of the carbon source, and the graphited carbon was supposed to give more stability as an electrocatalyst support. © 2014 The Royal Society of Chemistry.

Sun A.,Jiangsu University | Yu G.,Changzheng Hospital | Dou X.,Jiangsu University | Yan X.,Center for Health Research | And 2 more authors.
Molecular Cancer | Year: 2015

Background: Gastric cardia adenocarcinoma (GCA) is the most aggressive subtype of gastric carcinoma. New molecular markers and therapeutic targets are needed for diagnosis, prognosis and treatment of GCA. This study is to establish the E3 ubiquitin ligase Nedd4-1 as a prognostic biomarker to predict the survival and guide the treatment of GCA patients. Methods: Expression of Nedd4-1 in 214 GCA tumor samples was detected by immunohistochemistry staining (IHC) using tissue microarray assay (TMA). Association of Nedd4-1 with cumulative survival of the TNM stages I-III patients and clinicopathological characteristics was statistically analyzed. The role of Nedd4-1 in gastric cancer cell migration and invasion were determined by transwell and wound healing assays. Results: Nedd4-1 is overexpressed in 83% of the GCA tumors. The 5-year survival rate in Nedd4-1 negative GCA patients is as high as 96%. Log-rank analysis indicated that overexpression of Nedd4-1 is inversely correlated with cumulative survival (χ 2 = 21.885, p <0.001). Multivariate logistic regression analysis showed that overexpression of Nedd4-1 is associated with an extremely low GCA survival rate with a hazard ratio (HR) = 0.068 (p = 0.008) in TNM stages I-III patients. Statistical analysis of association of Nedd4-1 overexpression with clinicopathological characteristics revealed that overexpression of Nedd4-1 is tightly associated with TNM stage (p < 0.001). Knockdown of Nedd4-1 in gastric cancer cell lines AGS and N87 dramatically inhibited the gastric cancer cell migration and invasion. Conclusions: Our results indicate that Nedd4-1 is an exceptional prognostic biomarker for GCA and suggest that Nedd4-1 may play an essential role in GCA metastasis. © 2014 Sun et al.; licensee BioMed Central Ltd.

Miao X.,Jiangsu University | Zou S.,Guangzhou University | Zhang H.,Sun Yat Sen University | Ling L.,Sun Yat Sen University
Sensors and Actuators, B: Chemical | Year: 2014

High level of carcinoembryonic antigen (CEA) can signal the presence of cancer directly. Thus simple and sensitive detection of CEA is of great importance. Here, sensitive CEA detection in human serum was realized by using Ag@Au core-shell nanoparticles (CSNPs) and dynamic light scattering (DLS) based on monitoring the average diameter change of Ag@Au CSNPs after the specific bind between CEA antibody (anti-CEA) and CEA. Under optimal conditions, CEA could be detected linearly in the range of 60 pg/mL to 50 ng/mL, with a detection limit of 35.6 pg/mL. Moreover, satisfactory results were obtained when the assay was used in human serum CEA detection. © 2013 Elsevier B.V.

Qiu F.,Jiangsu University | Li Y.,Jiangsu University | Yang D.,Jiangsu University | Li X.,Jiangsu Provincial Key Laboratory of Power Machinery and Application of Clean Energy | Sun P.,Jiangsu Provincial Key Laboratory of Power Machinery and Application of Clean Energy
Applied Energy | Year: 2011

The biodiesel (fatty acid methyl esters, FAME) was prepared by transesterification of the mixed oil (soybean oil and rapeseed oil) with sodium hydroxide (NaOH) as catalyst. The effects of mole ratio of methanol to oil, reaction temperature, catalyst amount and reaction time on the yield were studied. In order to decrease the operational temperature, a co-solvent (hexane) was added into the reactants and the conversion efficiency of the reaction was improved. The optimal reaction conditions were obtained by this experiment: methanol/oil mole ratio 5.0:1, reaction temperature 55 °C, catalyst amount 0.8. wt.% and reaction time 2.0. h. Under the optimum conditions, a 94% yield of methyl esters was reached ∼94%. The structure of the biodiesel was characterized by FT-IR spectroscopy. The sulfur content of biodiesel was determined by Inductively Coupled Plasma emission spectrometer (ICP), and the satisfied result was obtained. The properties of obtained biodiesel from mixed oil are close to commercial diesel fuel and is rated as a realistic fuel as an alternative to diesel. Production of biodiesel has positive impact on the utilization of agricultural and forestry products. © 2010 Elsevier Ltd.

Zhang C.,Jiangsu University | Zhang C.,CAS Shanghai Institutes for Biological Sciences | de Silva S.,Ohio State University | Wang J.-H.,CAS Shanghai Institutes for Biological Sciences | Wu L.,Ohio State University
PLoS ONE | Year: 2012

Cross-species transmission and adaptation of simian immunodeficiency viruses (SIVs) to humans have given rise to human immunodeficiency viruses (HIVs). HIV type 1 (HIV-1) and type 2 (HIV-2) were derived from SIVs that infected chimpanzee (SIVcpz) and sooty mangabey (SIVsm), respectively. The HIV-1 restriction factor SAMHD1 inhibits HIV-1 infection in human myeloid cells and can be counteracted by the Vpx protein of HIV-2 and the SIVsm lineage. However, HIV-1 and its ancestor SIVcpz do not encode a Vpx protein and HIV-1 has not evolved a mechanism to overcome SAMHD1-mediated restriction. Here we show that the co-evolution of primate SAMHD1 and lentivirus Vpx leads to the loss of the vpx gene in SIVcpz and HIV-1. We found evidence for positive selection of SAMHD1 in orangutan, gibbon, rhesus macaque, and marmoset, but not in human, chimpanzee and gorilla that are natural hosts of Vpx-negative HIV-1, SIVcpz and SIVgor, respectively, indicating that vpx drives the evolution of primate SAMHD1. Ancestral host state reconstruction and temporal dynamic analyses suggest that the most recent common ancestor of SIVrcm, SIVmnd, SIVcpz, SIVgor and HIV-1 was a SIV that had a vpx gene; however, the vpx gene of SIVcpz was lost approximately 3643 to 2969 years ago during the infection of chimpanzees. Thus, HIV-1 could not inherit the lost vpx gene from its ancestor SIVcpz. The lack of Vpx in HIV-1 results in restricted infection in myeloid cells that are important for antiviral immunity, which could contribute to the AIDS pandemic by escaping the immune responses. © 2012 Zhang et al.

Ming Z.,Tsinghua University | Ming Z.,Jiangsu University | Jian L.,Jiangsu University | Chunxia W.,Jiangsu University | And 2 more authors.
Soft Matter | Year: 2011

The slippage effect at the interface between a confined fluid and the surface around it has a potential application in microfluidic and nanofluidic devices. To investigate the slippage effect of fluid on superhydrophobic surfaces, a series of rheological experiments are carried out for superhydrophobic surfaces coated with carbon nanotube forests (CNTs), which are prepared by the chemical vapor deposition method (CVD). The results show that such surfaces can create certain slippage effects for a fluid flowing over them and that the slip length is in accordance with the theoretical prediction as well as the value measured through other experimental methods. As the same trend is observed for both the theoretical and experimental slip lengths, the theoretical model can be used to optimize the superhydrophobic surfaces for the slippage effect or drag reduction. The superhydrophobic surfaces with considerable slippage effects have broad potential application in micro- and nanofluidic devices or biodevices to solve the fluid resistance problem. © 2011 The Royal Society of Chemistry.

Yan Z.,Jiangsu University | Wang H.,Wuhan University of Technology | Zhang M.,Jiangsu University | Jiang Z.,Jiangsu University | And 2 more authors.
Electrochimica Acta | Year: 2013

Molybdenum carbide (Mo2C) particles on carbonized resin (C-Mo2C) were successfully synthesized through ionic exchange process. The diameter from 3 nm to 50 nm of the Mo2C particles can be easily controlled by adjusting the experimental parameters. Pt nanoparticles were then loaded on the C-Mo2C to form Pt/C-Mo2C electrocatalyst for methanol oxidation in acidic media. The above materials were characterized by XRD, TEM, TG, EDS, XPS and cyclic voltammograms measurements. The results show that Pt/C-Mo2C gives 1.7 times higher peak current density and 100 mV more negative onset potential than that of commercial Pt/C electrocatalyst at the same Pt loadings. Moreover, Pt/C-Mo2C shows higher electrochemical stability than that of Pt/C. The improved catalytic activity is due to the synergistic effect of Mo2C on Pt; the improved electrochemical stability is related to the strong interaction force between Pt and Mo2C. Since Pt/C-Mo2C carries higher catalytic activity and stability comparing with Pt/C, less Pt will be required for the same performance and it will in turn reduce the cost of fuel cell electrocatalyst. © 2013 Elsevier Ltd. All rights reserved.

Qiu F.,Jiangsu University | Li Y.,Jiangsu University | Yang D.,Jiangsu University | Li X.,Jiangsu Provincial Key Laboratory of Power Machinery and Application of Clean Energy | Sun P.,Jiangsu Provincial Key Laboratory of Power Machinery and Application of Clean Energy
Bioresource Technology | Year: 2011

A solid base nanocatalyst was prepared by ZrO 2 loaded with C 4H 4O 6HK and investigated for transesterification of soybean oil with methanol to biodiesel. The obtained nanocatalyst was characterized by means of XRD, FTIR, TEM, TGA, N 2 adsorption-desorption measurements and the Hammett indicator method. TEM photograph showed that the nanocatalyst had granular and porous structures with particle sizes of 10-40nm. The nanocatalyst had longer lifetime and maintained sustained activity after being used for five cycles. The separate effects of the molar ratio of methanol to oil, reaction temperature, nanocatalyst amount and reaction time were investigated. The experimental results showed that a 16:1M ratio of methanol to oil, 6.0% catalyst, 60°C reaction temperature and 2.0h reaction time gave the best results and the biodiesel yield of 98.03% was achieved. Production of biodiesel has positive impact on the utilization of agricultural and forestry products. © 2010 Elsevier Ltd.

Li B.-J.,Jiangsu University | Huang L.-J.,Jiangsu University | Zhou M.,Tsinghua University | Ren N.-F.,Jiangsu University | Wu B.,Jiangsu University
Ceramics International | Year: 2014

In order to improve the transparency and conductivity of the commercial fluorine-doped tin oxide (FTO) films deposited on glass substrates, a nanosecond pulsed laser with a wavelength of 532 nm was used to irradiate the surfaces of the films. The effects of laser fluence and scanning speed on the surface morphology, photoelectric property and overall quality of the FTO films were investigated. The FTO films which were subjected to lower laser fluences or higher scanning speeds achieved gentle laser annealing effects, resulting in unapparent changes in surface morphology. These changes caused enhancements in optical transmittance and decrease in sheet resistance. The FTO films irradiated with higher laser fluences or lower scanning speeds melted and ablated, causing the optical transmittance and the electrical conductivity of the films to drop significantly. Experimental results indicated that the optimum irradiation fluence and scanning speed for 532 nm nanosecond laser annealing of FTO films were 1.02 J/ cm2 and 10 mm/ s, respectively. The corresponding film had an obvious increase in crystallite size. The RMS roughness, the average optical transmittance in the waveband of 380-780 nm and the figure of merit were increased from 100.5 nm, 75.4% and 5.82×10-3 Ω-1 to 113.0 nm, 82.7% and 17.00×10-3 Ω-1 respectively, while the sheet resistance was reduced from 10.2 Ω/□ to 8.8 Ω/□. © 2013 Elsevier Ltd and Techna Group S.r.l.

Yan Z.,Jiangsu University | Zhang M.,Jiangsu University | Xie J.,Jiangsu University | Zhu J.,Jiangsu University | Shen P.K.,Sun Yat Sen University
Applied Catalysis B: Environmental | Year: 2015

Novel and stable bimetallic carbide (Fe2MoC) anchored on graphitized carbon (GC) has been synthesized by an ion-exchange method. The Pd supported on GC-Fe2MoC electrocatalyst (Pd/GC-Fe2MoC) shows superior activity and stability to commercial Pt/C for oxygen reduction reaction (ORR) in acidic media. The XPS spectra reveal that the excellent performance of Pd/GC-Fe2MoC should be due to the excellent electron-donating (synergistic effect) of Fe2MoC to Pd, which not only facilitates the reduction of O2 but also increases the linkage strength between Pd and Fe2MoC. The Koutecky-Levich plots indicate 4-electron transfer for the Pd/GC-Fe2MoC catalyzed ORR. © 2014 Elsevier B.V.

Ren N.-F.,Jiangsu University | Huang L.-J.,Jiangsu University | Zhou M.,Jiangsu University | Zhou M.,Tsinghua University | Li B.-J.,Jiangsu University
Ceramics International | Year: 2014

Silver nanoparticles (Ag NPs) were prepared on commercial fluorine-doped tin oxide (FTO) glass by direct current (DC) magnetron sputtering and thermal annealing treatment. The effects of Ag layer thickness on the morphology of Ag NPs and performance of Ag/FTO bilayer films were investigated. The annealed Ag/FTO bilayer film with a 5 nm-thick Ag layer (Ag5/FTO bilayer film), which was covered with densely distributed 70-nm Ag NPs, possessed a sheet resistance of 5.7 Ω/sq that is lower than that of the FTO single-layer film (8.5 Ω/sq). The annealed Ag5/FTO bilayer film was selected for further optimization by coating it with sputtered aluminum-doped zinc oxide (AZO) layers. After thermal annealing, the AZO/Ag/FTO trilayer film with a 500 nm-thick AZO layer had a figure of merit of 2.97×10-2 Ω-1, which is more than double that of the FTO single-layer film (1.30×10-2 Ω-1). The results indicate that the introduction of Ag NPs and AZO layer can effectively improve the overall photoelectric property of FTO single-layer films. © 2014 Elsevier Ltd and Techna Group S.r.l.

Zhang X.,Texas Tech University Health Sciences Center | Zhang X.,Jiangsu University | Wang W.,Texas Tech University Health Sciences Center | Wang H.,CAS Shanghai Institutes for Biological Sciences | And 3 more authors.
Oncogene | Year: 2013

There is an increasing interest in determining the role of ribosomal proteins (RPs) in the regulation of MDM2-p53 pathway in coordinating cellular response to stress. Herein, we report a novel regulatory role of ribosomal protein S25 (RPS25) in MDM2-mediated p53 degradation and a feedback regulation of S25 by p53. We demonstrated that S25 interacted with MDM2 and inhibited its E3 ligase activity, resulting in the reduction of MDM2-mediated p53 ubiquitination and the stabilization and activation of p53. S25, MDM2 and p53 formed a ternary complex following ribosomal stress. The nucleolar localization and MDM2-binding domains of S25 were critical for its role in MDM2-mediated p53 regulation. Knockdown of S25 by siRNA attenuated the induction and activation of p53 following ribosomal stress. S25 stabilized and cooperated with MDMX to regulate MDM2 E3 ligase activity. Furthermore, S25 was identified to be a transcriptional target of p53; p53 directly bound to S25 promoter and suppressed S25 expression. Our results suggest that there is a S25-MDM2-p53 regulatory feedback loop, which may have an important role in cancer development and progression. © 2013 Macmillan Publishers Limited All rights reserved.

Liu H.,Tsinghua University | Hu Z.,Jiangsu University | Song Y.,Jiangsu University | Lin J.,Jiangsu University
IEEE Transactions on Power Systems | Year: 2013

Vehicle-to-grid (V2G) control has the potential to provide frequency regulation service for power system operation from electric vehicles (EVs). In this paper, a decentralized V2G control (DVC) method is proposed for EVs to participate in primary frequency control considering charging demands from EV customers. When an EV customer wants to maintain the residual state of charge (SOC) of the EV battery, a V2G control strategy, called battery SOC holder (BSH), is performed to maintain the battery energy around the residual SOC along with adaptive frequency droop control. If the residual battery energy is not enough for next trip, the customer needs to charge the EV to higher SOC level. Then, a smart charging method, called charging with frequency regulation (CFR), is developed to achieve scheduled charging and provide frequency regulation at the same time. Simulations on a two-area interconnected power system with wind power integration have shown the effectiveness of the proposed method. © 1969-2012 IEEE.

Huang Y.-J.,Jiangsu University | Huang Y.-J.,Tonghua Teachers College | Ni L.,Jiangsu University
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2011

Two 3D coordination polymers, [Cd(BDC)(Medpq)·H 2O] n1, and [Co(BDC)(Medpq)·H 2O] n2 (BDC = terephthalic acid, Medpq = 2-Methyldipyrido[3,2-f:2′,3′-h]quinoxaline), have been synthesized by self-assembly. The structure analyses show that both of the two coordination polymers are formed by 1D infinite chains through non-covalent interactions, and both of them are based on 1D zigzag ones. The photoluminescent study of the coordination polymer [Cd(BDC)(Medpq)·H 2O] n shows that it exhibit fluorescent emission bands at 567.7 nm. © 2010 Springer Science+Business Media, LLC.

Chen X.,Jiangsu University | Wang L.,Jilin University
Computers and Mathematics with Applications | Year: 2010

In this paper, the variational iteration method is applied to neutral functional-differential equations with proportional delays. Illustrative examples are given to show the efficiency of the method. We also compare the performance of the method with that of a particular Runge-Kutta method and a one-leg θ-method. © 2010 Elsevier Ltd. All rights reserved.

Dai W.,Tsinghua University | Chen X.-F.,Jiangsu University | Zhang B.-W.,Central China Normal University | Wang E.,Central China Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

The transverse momentum spectrum of η meson in relativistic heavy-ion collisions is studied at the Next-to-Leading Order (NLO) within the perturbative QCD, where the jet quenching effect in the QGP is incorporated with the effectively medium-modified η fragmentation functions using the higher-twist approach. We show that the theoretical simulations could give nice descriptions of PHENIX data on η meson in both p+p and central Au + Au collisions at the RHIC, and also provide numerical predictions of η spectra in central Pb + Pb collisions with sNN=2.76 TeV at the LHC. The ratios of η/π0 in p+p and in central Au + Au collisions at 200 GeV are found to overlap in a wide pT region, which matches well the measured ratio η/π0 by PHENIX. We demonstrate that, at the asymptotic region when pT→∞ the ratios of η/π0 in both Au + Au and p+p are almost determined only by quark jets fragmentation and thus approach to the one in e+e- scattering; in addition, the almost identical gluon (quark) contribution fractions to η and to π result in a rather moderate variation of η/π0 distribution at intermediate and high pT region in A+A relative to that in p+p; while a slightly higher η/π0 at small pT in Au + Au can be observed due to larger suppression of gluon contribution fraction to π0 as compared to the one to η. The theoretical prediction for η/π0 at the LHC has also been presented. © 2015 The Authors.

Wu L.,Tsinghua University | Zhu J.,Jiangsu University | Xie H.,Tsinghua University
Applied Optics | Year: 2015

By using the principle of stereovision, 3D digital image correlation (3D-DIC) can determine the 3D morphology and deformation of a target and has been widely used in experimental mechanics as a noncontact 3D measurement technique. To eliminate the limitations of the conventional 3D-DIC system, this study proposes a calibration-free single-lens 3D-DIC system based on a bilateral telecentric lens and a bi-prism. The performance of the proposed system is verified by tests of rigid-body translation along the out-of-plane direction. As a comparison, the same rigid-body translations are measured using a single-entocentric-lens 3D-DIC system. The results show that the measurement accuracy of the proposed system is higher than that of the entocentric-lens-based one. As an application, the proposed system is used to measure the thermal linear expansion of a ceramic plate at elevated temperatures. The reasonable measurement results verify its applicability in deformation measurements, even in high-temperature environments. © 2015 Optical Society of America.

Li S.,Jilin University | Yu M.,Jiangsu University | Li H.,Qingdao University | Zhang H.,Jilin University | Jiang Y.,Jilin University
Mediators of Inflammation | Year: 2012

Guillain-Barré syndrome (GBS) is an acute autoimmune-mediated inflammatory demyelinating disease that causes rapidly progressing paralysis and occasionally respiratory failure. We hypothesized that interleukin (IL)-17 and IL-22 are elevated in GBS and participate in the autoimmune inflammatory response of GBS. We used sandwich enzyme-linked immunosorbent assay (ELISA) to measure the IL-17 and IL-22 levels in the CSF, and plasma from 22 GBS patients at the acute phase and 18 healthy controls (HC). The results show that CSF and plasma levels of IL-17 and IL-22 are elevated in GBS patients compared with HC. IL-17 and IL-22 levels in CSF, respectively, are correlated with GBS disability scale scores (GDSs). Meanwhile, IL-17 and IL-22 levels in CSF, IL-22 in CSF, and plasma of GBS patients have positive correlation, respectively. The increased levels of IL-17 and IL-22 in CSF may be explained by the disruption of blood-brain barrier (BBB) and peripheral nervous system (PNS) local inflammation in GBS. Meanwhile, the elevated levels of these two cytokines in plasma suggest the activation of Th17 and Th22 cells in the systemic immune response of GBS. Our data provide preliminary evidence that GBS is associated with high levels of IL-17 and IL-22 in CSF and plasma. These cytokines display pathogenic potential and may serve as useful biomarkers for GBS. © 2012 Shujuan Li et al.

Liu H.,Tsinghua University | Liu H.,Jiangsu University | Hu Z.,Tsinghua University | Song Y.,Tsinghua University
IEEE Transactions on Power Systems | Year: 2012

This paper proposes a novel Lyapunov-based excitation control (LEC) technique to deal with both global asymptotic stability and voltage regulation for the multi-machine power systems. Lyapunov function is built as a quadratic form of the control objectives consisted of active power offset, rotor speed offset and terminal voltage offset. A completely controllable linear system is constructed to design the trajectories of the time-derivatives of the control objectives. Furthermore, time-derivative of Lyapunov function (TLF) is also expressed as a quadratic form of the control objectives. Feedback gains are chosen to guarantee the negative definition of the TLF for any real number except for the equilibrium point. Therefore, the global asymptotic stability is achieved. The design flexibility of the proposed method provides convenience to introduce the voltage feedback signal for maintaining acceptable voltage level. The system voltage is forced to converge to its reference accompanying with the energy attenuation of Lyapunov function. As a result, voltage deviation is eliminated when Lyapunov function is equal to zero. Finally, a Lyapunov-based decentralized excitation controller is developed for the multi-machine power systems, and it is only related to local measurements. Simulations on a six-machine power system have illustrated better performances in comparison to the existing controllers. © 1969-2012 IEEE.

Wu L.,Tsinghua University | Zhu J.,Jiangsu University | Xie H.,Tsinghua University
Measurement Science and Technology | Year: 2014

Three-dimensional (3D) digital image correlation (DIC) is an effective measurement method to obtain both 3D morphology and displacements of a target. The aim of this study was to investigate the 3D DIC technique using a single camera and a bi-prism so as to benefit from the high accuracy of measurements and the compatibility of the measurement system. A modified virtual point (MVP) model based on the analysis of light refraction in the prism using a backward ray-tracing method was proposed. As applications, the measurements of morphology and rigid-body translations of a cylindrical specimen and the deflection of a cantilever were conducted. The results show that the proposed method is capable of accurate determination of the 3D morphology and displacements. They also verify that the MVP model is feasible and that the designed bi-prism for the single-camera 3D DIC technique is reliable in morphology retrieval and displacement measurements. © 2014 IOP Publishing Ltd.

Ma K.,Tsinghua University | Xie H.,Tsinghua University | Zhu J.,Jiangsu University
Measurement Science and Technology | Year: 2014

In this work, we propose two novel methods for the measurement of the slope of reflective surfaces, namely phase-shift based coherent gradient sensing: both a three-step and four-step phase shifting method are deduced theoretically and the full-field phase value can be calculated accurately by three or four inteferograms. Using these two methods, the automatic process of the fringes can be realized and the experimental results show that the relative errors of the curvature measurement with both methods are less than 5%. These successful results verify the feasibility of these methods, and both have a good potential to be utilized for measuring the slope, curvature, and shape of a thin film/substrate system. © 2014 IOP Publishing Ltd.

Miao X.,Jiangsu University | Li Z.,Jiangsu University | Ling L.,Sun Yat Sen University
Analyst | Year: 2016

An ultrasensitive fluorescent platform for sequence-specific recognition of double-stranded DNA (dsDNA) based on the quenching of gold nanoparticles (AuNPs) to a fluorophore labeled DNA probe was developed. The target dsDNA could hybridize with the loop portion of the molecular beacon (MB) to form a triplex DNA structure and opened the "stem-loop" structure of the MB; such triplex DNA was used as an assistant probe (AP). Meanwhile, a fluorophore labeled DNA-AuNP probe that contained a specific enzyme cleavage site was introduced and its fluorescence signal was efficiently quenched due to the vicinity of the fluorophore to the AuNP surface. Such a DNA-AuNP probe could hybridize with the 5′ stem portion of the MB in the AP to form duplex DNA strands that contained a specific enzyme cleavage site for the nicking enzyme assisted cleavage reaction, and resulted in the release of the fluorophore from the AuNP surface and the recovery of the fluorescence signal. Because the AP remains intact during such a cleavage process, it could be reused to hybridize with the next DNA-AuNP probe and trigger the nicking nuclease assisted signal amplification. Under optimal conditions, a low detection limit of 3.8 pM was obtained for dsDNA detection, and the assay has high sequence specificity for dsDNA detection. © 2016 The Royal Society of Chemistry.

Cheng L.,Jiangsu University | Liu J.,Jiangsu University | Gu X.,Jiangsu University | Gong H.,Jiangsu University | And 9 more authors.
Advanced Materials | Year: 2014

A new generation of photothermal theranostic agents is developed based on PEGylated WS2 nanosheets. Bimodal in vivo CT/photoacoustic imaging reveals strong tumor contrast after either intratumoral or intravenous injection of WS2-PEG. In vivo photothermal treatment is then conducted in a mouse tumor model, achieving excellent therapeutic efficacy with complete ablation of tumors. This work promises further exploration of transition-metal dichalcogenides for biomedical applications, such as cancer imaging and therapy. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Yan Z.,Jiangsu University | Yan Z.,Sun Yat Sen University | Zhang M.,Jiangsu University | Xie J.,Jiangsu University | Shen P.K.,Sun Yat Sen University
Journal of Power Sources | Year: 2013

The vanadium carbide particles with the diameter of 1-3 nm on graphitized resin (GC-V8C7) are synthesized through ionic exchange process. The materials are characterized by XRD, Raman, TEM, SEM and EDS measurements. The results prove that the ion-exchange resin as both carbon source and dispersion media favors the formation of very uniform and small (1-3 nm) V8C7 particles, and protect the V8C 7 from conglomeration even at the temperature of 1500 C. Meanwhile, the vanadium compound is found efficient catalytic effect on graphitization of ion-exchange resin, leading to high graphitization degree of GC-V 8C7. Pd particles are loaded on the GC-V8C 7 materials as electrocatalyst (Pd/GC-V8C7) for ethanol oxidation in alkaline media. The cyclic voltammograms measurements show that both V8C7 and GC (graphitized ion-exchange resin) give Pd electrocatalyst improved catalytic performance in activity, stability and overpotential, compared with that of Pd supporting on Vulcan XC-72 carbon (Pd/C). The present synthesizing method of GC-V8C7 is simple and effective, which can be readily scaled up for mass production of other nanomaterials. © 2013 Elsevier B.V. All rights reserved.

Yan Z.,Jiangsu University | Zhang M.,Jiangsu University | Xie J.,Jiangsu University | Wang H.,Wuhan University of Technology | Wei W.,Jiangsu University
Journal of Power Sources | Year: 2013

Bowl-like carbons (BLCs) with mesoporous structure are prepared using glucose as carbon source and solid core mesoporous shell silica spheres (SCMSSs) as templates. Pt particles are then loaded on the BLCs as electrocatalyst and used for both methanol oxidation and oxygen reduction reaction (ORR) in acidic media. Physical measurements display that the BLCs are formed due to flowing of melted glucose along the mesoporous shell of the SCMSSs. Moreover, the BLCs with high surface area (1108.3 m2 g-1), large pore volume (2.7 cm3 g-1) and mesoporous structure (9.4 nm in diameter) are beneficial for uniform dispersion and stable loading of smaller noble metal particles, and efficiently improve the mass transfer in catalytic reactions, compared to carbon powders. Cyclic voltammogram measurements show that the mass current densities on Pt/BLC electrocatalyst are 2.6 times (1846mAmgPt-1) for methanol oxidation and 1.6 times (180.6mAmgPt-1) for ORR as high as that of commercial Pt/C (TKK). Furthermore, the mesopores give Pt/BLC more electrocatalytic stability due to stronger physical interaction force. © 2013 Elsevier B.V. All rights reserved.

Yan Z.,Jiangsu University | Yan Z.,Sun Yat Sen University | He G.,Sun Yat Sen University | Cai M.,General Motors | And 2 more authors.
Journal of Power Sources | Year: 2013

Tungsten carbide nanoparticles with the average size less than 5 nm uniformly dispersed on the graphitized carbon matrix have been successfully synthesized by a one-step ion-exchange method. This route is to locally anchor the interested species based on an ionic level exchange process using ion-exchange resin. The advantage of this method is the size control of targeted nanomaterial as well as the graphitization of resin at low temperatures catalyzed by iron salt. The Pt nanoparticles coupled with tungsten carbide nanoparticles on graphitized carbon nanoarchitecture form a stable electrocatalyst (Pt/WC-GC). The typical Pt/WC-GC electrocatalyst gives a Pt-mass activity of 247.7 mA mgPt -1, which is much higher than that of commercial Pt/C electrocatalyst (107.1 mA mgPt -1) for oxygen reduction reaction due to the synergistic effect between Pt and WC. The presented method is simple and could be readily scaled up for mass production of the nanomaterials. © 2013 Elsevier B.V. All rights reserved.

Wang P.,Jiangsu University | Chen H.,Jiangsu University | Tian J.,Jiangsu University | Dai Z.,Sun Yat Sen University | Zou X.,Sun Yat Sen University
Biosensors and Bioelectronics | Year: 2013

An efficient electrochemical approach for the evaluation of DNA methylation level was proposed according to the oxidation signal of DNA bases at an overoxidized polypyrrole (PPyox) directed multiwalled carbon nanotubes (MWNTs) film modified glassy carbon electrode (GCE). The PPyox/MWNTs/GCE exhibited remarkable electrocatalytic activities towards the oxidation of DNA bases due to the advantages of wide potential window, large effective surface area, and excellent antifouling property. As a result, all purine and pyrimidine bases of guanine (G), adenine (A), thymine (T), cytosine (C) and 5-methylcytosine (5-mC) exhibited well identified oxidation peaks at the PPyox/MWNTs/GCE. The direct potential resolution between 5-mC and C was obtained to be 180. mV, which was large enough for their signal recognition and accurate detection in mixture. In particular, the signal interference from T, a great challenge in exploring DNA methylation, was successfully eliminated by an innovative strategy, which was developed based on the stoichiometric relationship between purine and pyrimidine bases in DNA molecular structure. The proposed method was effectively applied to the rapid detection of DNA methylation status in real sample within 45. min with satisfactory results. © 2013 Elsevier B.V.

Hansen F.,Tohoku University | Zhang Z.,Jiangsu University | Zhang Z.,Tohoku University
Letters in Mathematical Physics | Year: 2015

The notion of matrix entropy was introduced by Tropp and Chen with the aim of measuring the fluctuations of random matrices. It is a certain entropy functional constructed from a representing function with prescribed properties, and Tropp and Chen gave some examples. We give several abstract characterisations of matrix entropies together with a sufficient condition in terms of the second derivative of their representing function. © 2015, Springer Science+Business Media Dordrecht.

Zhao L.,University of Jinan | Li S.,Jiangsu University | He J.,University of Jinan | Tian G.,Shandong Academy of Sciences | And 2 more authors.
Biosensors and Bioelectronics | Year: 2013

A novel electrochemical immunosensor capable of enzyme-free detection of alpha fetoprotein (AFP) is reported. This immunosensor was fabricated in a sandwich-like format where catalytic Au-Pd nanocrystals and highly conductive N-doped graphene sheets were incorporated. The significant catalysis by Au-Pd nanocrystals toward hydrogen peroxide, along with the increased electron transfer by graphene sheets, caused signal generation and increased sensitivity, which enables the enzyme-free detection of AFP. With a low detection limit at 0.005ngmL-1, this novel immunosensor worked well over the broad linear range of 0.05-30ngmL-1. Unlike previously reported enzyme-based electrochemical immunosensors, which often involve the complicated steps for enzyme loading and necessary treatments to keep the activity of enzyme, this novel immunosensor is simple in nature and employed catalytic Au-Pd nanoparticles and highly conductive graphene, which thus enables reliable and sensitive detection for clinic usage. © 2013 Elsevier B.V.

Zhu G.,State Key Laboratory of Coordination Chemistry | Zhu G.,Jiangsu University | Zhang S.,Nanjing University | Zhang S.,Shandong University of Technology | And 3 more authors.
Journal of the American Chemical Society | Year: 2011

Highly uniform single crystal ultrathin ZnS nanowires (NWs) with 2 nm diameter and up to 10 μm length were fabricated using a catalyst-free colloidal chemistry strategy. The nanowires crystallized in hexagonal phase structure with preferential growth along the direction of the (001) basal plane. The strong polarity of the (001) plane composed of Zn cations or S anions drives the oriented attachment of ZnS nanocrystals (NCs) along this direction via electrostatic (or dipole) interaction. The ultrathin ZnS nanowires show intrinsic ferromagnetism at room temperature and other unusual properties related to its unique nature, such as large anisotropic lattice expansion, large blue-shift of UV-vis absorption band of the excition, and photoluminescence spectrum of the exciton band edge. First-principles DFT computation results show that Zn vacancies can induce intrinsic ferromagnetism in these undoped ZnS NWs. The main source of the magnetic moment arises from the unpaired 3p electrons at S sites surrounding the Zn vacancies carrying the magnetic moment ranging from 0.26 to 0.66 μB. Calculated results indicate that the magnetic moment of the ultrathin ZnS NWs can be increased by increasing the Zn vacancy concentration without significant energy cost. The calculated magnetization value (1.96 or 0.40 emu/g for Zn vacancies on the surface of NWs or inside, respectively) by Zn53S54 supercell model is larger than our experimental value (0.12 emu/g at 1.8 K and 0.05 emu/g at 300 K), but the ferromagnetic result is qualitatively in agreement. © 2011 American Chemical Society.

Su Y.,Yancheng Teachers University | Su Y.,Jiangsu University | Wang Z.,Yancheng Teachers University
Fuzzy Sets and Systems | Year: 2014

In this paper, we firstly give out the formulas for calculating the upper (lower) approximation implications and coimplications of a binary operation on a complete lattice. Then, we discuss some properties of the upper (lower) approximation implications and coimplications. Finally, we investigate the relations between the upper (lower) approximation implications and the lower (upper) approximation coimplications. © 2014 Elsevier B.V. All rights reserved.

Abidi H.,University of Tunis | Gui G.,Jiangsu University | Gui G.,Chinese University of Hong Kong | Zhang P.,CAS Academy of Mathematics and Systems Science
Archive for Rational Mechanics and Analysis | Year: 2012

We prove the local wellposedness of three-dimensional incompressible inhomogeneous Navier-Stokes equations with initial data in the critical Besov spaces, without assumptions of small density variation. Furthermore, if the initial velocity field is small enough in the critical Besov space Ḃ2,1 1/2(ℝ3)this system has a unique global solution. © 2011 Springer-Verlag.

Pei J.,Jiangsu University | Yuan S.,Jiangsu University | Benra F.-K.,University of Duisburg - Essen | Dohmen H.J.,University of Duisburg - Essen
Journal of Fluids Engineering, Transactions of the ASME | Year: 2012

In this paper, the periodically unsteady pressure field caused by rotor-stator interaction has been investigated numerically by computational fluid dynamics (CFD) calculation to evaluate the transient pressure variation in a single-blade pump for multiconditions. Side chamber flow effect is also considered for the simulation to accurately predict the flow in a whole-flow passage. The strength of the pressure fluctuation is analyzed quantitatively by defining the standard deviation of the pressure fluctuation of a revolution period. The analysis of the results shows that higher pressure fluctuation magnitudes can be observed near the blade pressure side and high gradients of fluctuation magnitudes can be obtained at the trailing edge near the pressure side of the blade. An asymmetrical distribution of fluctuation magnitudes in the volute domain can be clearly obtained. On the cylindrical surface around the impeller outlet, although the absolute pressure value is higher for the Q 11 l/s condition, the magnitude distribution of fluctuations is lower, and a relatively symmetrical fluctuation distribution is obtained for the Q 22 l/s condition when clearly asymmetrical distributions of fluctuation magnitude can be observed for the design point and for large flow rates. Obvious periodicity can be observed for the pressure fluctuation magnitude distribution on the circumference with different radii in the volute domain, and some subpeaks and subvalleys can be found. The effects of unsteady flow in the side chambers on the entire passage flow cannot be neglected for accurately predicting the inner flow of the pump. The results of unsteady pressure fluctuation magnitude can be used to guide the optimum design of the single-blade pump to decrease the hydrodynamic unbalance and to obtain more stable performance of the pump. © 2012 American Society of Mechanical Engineers.

Zou C.,Chinese University of Hong Kong | Zou C.,Jiangsu University | Yu S.,Chinese University of Hong Kong | Xu Z.,Chinese University of Hong Kong | And 6 more authors.
Journal of Pathology | Year: 2014

Adaptation of cancer cells to a hypoxic microenvironment is important for their facilitated malignant growth and advanced development. One major mechanism mediating the hypoxic response involves up-regulation of hypoxia-inducible factor 1 (HIF-1) expression, which controls reprogramming of energy metabolism and angiogenesis. Oestrogen-related receptor-α (ERRα) is a pivotal regulator of cellular energy metabolism and many biosynthetic pathways, and has also been proposed to be an important factor promoting the Warburg effect in advanced cancer. We and others have previously shown that ERRα expression is increased in prostate cancer and is also a prognostic marker. Here we show that ERRα is oncogenic in prostate cancer and also a key hypoxic growth regulator. ERRα-over-expressing prostate cancer cells were more resistant to hypoxia and showed enhanced HIF-1α protein expression and HIF-1 signalling. These effects could also be observed in ERRα-over-expressing cells grown under normoxia, suggesting that ERRα could function to pre-adapt cancer cells to meet hypoxia stress. Immunoprecipitation and FRET assays indicated that ERRα could physically interact with HIF-1α via its AF-2 domain. A ubiquitination assay showed that this ERRα-HIF- 1α interaction could inhibit ubiquitination of HIF-1α and thus reduce its degradation. Such ERRα-HIF-1α interaction could be attenuated by XCT790, an ERRα-specific inverse agonist, resulting in reduced HIF-1α levels. In summary, we show that ERRα can promote the hypoxic growth adaptation of prostate cancer cells via a protective interaction with HIF-1α, suggesting ERRα as a potential therapeutic target for cancer treatment. Copyright © 2014 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. Copyright © 2014 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.

Liu Y.,Jiangnan University | Sun J.,Jiangsu University | Rao S.,Yangzhou University | Su Y.,Jiangnan University | Yang Y.,Jiangnan University
Food and Chemical Toxicology | Year: 2013

It is the first time to extract polysaccharides (CVPs) from Catathelasma ventricosum. The antihyperglycemic and antioxidant activity of CVPs in streptozotocin-induced diabetic mice were examined. Compared with untreated diabetic mice, the administration of CVPs for 30days caused a significant decrease in the concentrations of blood glucose, total cholesterol (TC), triglycerides (TGs), low-density lipoprotein-cholesterol (LDL-C) and maleic dialdehyde (MDA), and a significant increase in the concentrations of high density lipoprotein-cholesterol (HDL-C) and the activities of antioxidant enzymes. Specially, when normal mice were treated with CVPs, all detection indexes and pathologic morphologies of liver, kidney and pancreas are similar to untreated normal mice, which indicated CVPs are safe for normal mice. In addition, the average molecular weight of CVPs was estimated to be from 3.7×103 to 1.7×107Da and they were mainly composed of glucose (93.5%) with the conformation of α-d-Glucopyranose. © 2013 Elsevier Ltd.

Liu X.,Jiangsu University | Wang W.,University of Bonn | Xie Y.,Central China Normal University | Xie Y.,University of Edinburgh
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

We formulate the most general time-dependent distributions of Bs→J/ψ(→l+l-)φ(→K+K-) in which the direct charge parity (CP) violation is explicitly incorporated. We investigate the B→J/ψV decays in the perturbative QCD approach where V is a light vector meson. Apart from the leading-order factorizable contributions, we also take into account QCD vertex corrections and the hard-spectator diagrams. With the inclusion of these sizable corrections, most of our theoretical results for CP-averaged branching ratios, polarization fractions, CP-violating asymmetries, and relative phases are consistent with the available data. Based on the global agreement, we further explore the penguin contributions and point out that the φs extracted from Bs→J/ψφ can be shifted away by O(10-3). © 2014 American Physical Society.

Jiang H.,Jiangsu University | Jiang H.,Yancheng Teachers University | Bi Q.,Jiangsu University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

In this Letter, we investigate the problem of impulsive synchronization of networked multi-agent systems, where each agent can be modeled as an identical nonlinear dynamical system. Firstly, an impulsive control protocol is designed for network with fixed topology based on the local information of agents. Then sufficient conditions are given to guarantee the synchronization of the networked nonlinear dynamical system by using algebraic graph theory and impulsive control theory. Furthermore, how to select the discrete instants and impulsive constants is discussed. The case that the topologies of the networks are switching is also considered. Numerical simulations show the effectiveness of our theoretical results. Crown Copyright © 2010.

Han D.,Jiangsu University | Han D.,City College of New York | Sun M.,Jiangsu University
Physica A: Statistical Mechanics and its Applications | Year: 2016

In this paper, we explore an evolutionary vaccination game in the modified activity driven network by considering the closeness. We set a closeness parameter p which is used to describe the way of connection between two individuals. The simulation results show that the closeness p may have an active role in weakening both the spreading of epidemic and the vaccination. Besides, when vaccination is not allowed, the final recovered density increases with the value of the ratio of the infection rate to the recovery rate λ/μ. However, when vaccination is allowed the final density of recovered individual first increases and then decreases with the value of λ/μ. Two variables are designed to identify the relation between the individuals' activities and their states. The results draw that both recovered and vaccinated frequency increase with the increase of the individuals' activities. Meanwhile, the immune fee has less impact on the individuals' vaccination than the closeness. While the λ/μ is in a certain range, with the increase of the value of λ/μ, the recovered frequency of the whole crowds reduces. Our results, therefore, reveal the fact that the best of intentions may lead to backfire. © 2015 Elsevier B.V. All rights reserved.

Zhu H.,Wenzhou University | Tang D.,Jiangsu University | Duan Y.,Wenzhou University | Luo D.,Jiangsu University | Zhang J.,Jiangsu University
Optics Express | Year: 2013

1.6 μm eye-safe emission of a diode pumped Er,Yb co-doped YAG ceramic laser is firstly demonstrated. Operation of the ceramic laser under different ceramic sample lengths, co-doping concentrations and control temperatures were experimentally investigated. A maximum output power of 222 mW was achieved at an absorbed pump power of 8.1 W, corresponding to a conversion efficiency of 2.74%. Laser emission at 1.05 μm for transition of the Yb3+ ions was also studied on the same ceramic samples. The results clearly show the existence of resonantly energy transfer from the Yb3+ ions to Er 3+ ions. ©2013 Optical Society of America.

Han D.,Jiangsu University | Han D.,City College of New York | Sun M.,Jiangsu University | Li D.,Nanjing University of Aeronautics and Astronautics
Physica A: Statistical Mechanics and its Applications | Year: 2015

Considering the difference of different individuals' physical quality and antibody, this paper investigates the epidemic spreading model with the virus mutation. By using the mean-field theory, the epidemic threshold with degree-dependent spreading rate can be theoretical drawn. According to the numerical simulations, we can obtain that the average infected virus version in the BA network is less than the ER network. In addition, if the effective spreading rate is either small or large enough, the average virus version of the whole infected individuals will reduce. However, when the spreading rate takes some proper values, the average infected virus version can greatly increase. Finally, we study how the different initial infected nodes influence the average virus version of the whole infected individuals. The numerical results show that the greater of the initial infected degree, the smaller of the average virus version of the whole infected individuals. © 2015 Elsevier B.V.

Su Y.,Yancheng Teachers University | Su Y.,Jiangsu University | Wang Z.,Yancheng Teachers University
Fuzzy Sets and Systems | Year: 2013

Pseudo-uninorms are a generalization of uninorms by removing the commutativity from the axioms of the uninorms. In this paper, we further study pseudo-uninorms and coimplications on a complete lattice. Firstly, we discuss the residual coimplications of pseudo-uninorms and give equivalent conditions for left (right) infinitely ∧-distributive pseudo-uninorms. Then, we study some properties of (U,N)-coimplications generated from a pseudo-uninorm and a strong negation. Finally, we investigate the pseudo-uninorms induced by coimplications, present equivalent conditions for right infinitely ∨-distributive coimplications, and provide some conditions such that the operators induced by coimplications are uninorms. © 2012 Elsevier B.V.

Yang S.-S.,Jiangsu University | Derakhshan S.,Iran University of Science and Technology | Kong F.-Y.,Jiangsu University
Renewable Energy | Year: 2012

Insufficient understanding of the correlation between pump and pump as turbine (PAT) performance is a major problem encountered in the PAT selection and design. Therefore, establishment of accurate PAT performance prediction methods is necessary. In this paper, theoretical analysis of the relationship between pump and PAT performance was first performed. A theoretical method of predicting PAT performance is developed using theoretical analysis and empirical correlation. In the next step, computational fluid dynamics (CFD) was adopted in the direct and reverse modes performance prediction of a single stage centrifugal pump. To give a more accurate CFD result, all domains within the PAT control volume were modeled and hexahedral structured mesh was generated during CFD simulation. Complete performance curves of its pump and turbine modes were acquired. To verify the accuracy of theoretical and numerical prediction methods, the pump was manufactured and tested on a PAT open test rig. Results comparison and discussion of the theoretical, numerical and some other methods with experimental data were carried out. Eventually, relatively accurate theoretical and numerical PAT performance prediction methods were developed. © 2012 Elsevier Ltd.

Li X.,Technical University of Denmark | Li X.,Jiangnan University | Kanjwal M.A.,Technical University of Denmark | Lin L.,Jiangsu University | Chronakis I.S.,Technical University of Denmark
Colloids and Surfaces B: Biointerfaces | Year: 2013

Fast-dissolving drug delivery systems were prepared by electrospinning using polyvinyl alcohol (PVA) as the filament-forming polymer and drug carrier. Caffeine and riboflavin were used as the model drugs. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) and X-ray diffraction were applied to investigate the physicochemical properties of electrospun nanofibers. The SEM images showed that nanofibers prepared from electrospinning PVA/drug aqueous solutions possessed an ultrafine morphology with an average diameter in the range of 260-370. nm. Pharmacotechnical tests showed that PVA/caffeine and PVA/riboflavin nanofibrous mats had almost the same dissolution time (about 1.5. s) and wetting time (about 4.5. s). The release measurements indicated that drugs can be released in a burst manner (caffeine to an extent of 100% and riboflavin to an extent of 40% within 60. s) from the PVA nanofibrous matrices. © 2012 Elsevier B.V.

Duan Y.,Wenzhou University | Zhu H.,Wenzhou University | Ye Y.,Wenzhou University | Zhang D.,Wenzhou University | And 2 more authors.
Optics Letters | Year: 2014

This Letter describes an intracavity pumped optical parametric oscillator (OPO) based on noncritical phase matching RbTiOPO4 (RTP) crystal driven by a laser diode end-pumping acousto-optic Q-switched Nd:YVO4 laser. Simultaneous efficient signal light at 1.6 μm and idler light at 3.1 μm outputs were obtained. At an incident pump power of 10.5 W and a Q-switching pulse repetition frequency of 60 kHz, 1.42 W at center wavelength of about 1619 nm and 0.38 W at 3108 nm were achieved, with the diode to OPO total output conversion efficiency up to 17.1%. The pulse width is about 6.5 ns for the signal light corresponding to the fundamental light at 1064 nm of about 10 ns. The spectral widths of the signal and idler light are narrower than 0.5 and 1.0 nm. The result shows that the RTP crystal is an efficient crystal to generate eye-safe and mid-infrared lights by making full use of noncritical phase matching. © 2014 Optical Society of America.

Jiang H.,Jiangsu University | Jiang H.,Yancheng Teachers University | Yu J.,Yancheng Teachers University | Zhou C.,Yancheng Teachers University
International Journal of Systems Science | Year: 2011

In this article, we introduce impulsive control protocols for multi-agent linear dynamic systems. First, an impulsive control protocol is designed for network with fixed topology based on the local information of agents. Then sufficient conditions are given to guarantee the consensus of the multi-agent linear dynamic systems by the theory of impulsive systems. Furthermore, how to select the discrete instants and impulsive matrices is discussed. The case that the topologies of networks are switching is also considered. Numerical simulations show the effectiveness of our theoretical results. © 2011 Taylor & Francis.

Zhao C.,Hunan University | Zhang H.,Hunan University | Qi X.,Xiangtan University | Chen Y.,Hunan University | And 3 more authors.
Applied Physics Letters | Year: 2012

Under strong laser radiation, a Dirac material, the topological insulator (TI) Bi2Te3, exhibits an optical transmittance increase as a result of saturable absorption. Based on an open-aperture Z-scan measurement at 1550 nm, we clearly show that the TI, Bi2Te3 under our investigation, is indeed a very-high-modulation-depth (up to 95%) saturable absorber. Furthermore, a TI based saturable absorber device was fabricated and used as a passive mode locker for ultrafast pulse formation at the telecommunication band. This contribution unambiguously shows that apart from its fantastic electronic property, a TI (Bi2Te3) may also possess attractive optoelectronic property for ultrafast photonics. © 2012 American Institute of Physics.

Xue Y.-L.,Jiangsu University | Liu X.-H.,Zhejiang University of Technology | Zhang Y.-G.,Shandong Academy of Sciences
Asian Journal of Chemistry | Year: 2012

A cyclopropane derivative, 1-cyano-N-phenylcyclopropanecarboxamide (C 11H 10N 2O) was synthesized and its structure was studied by X-ray diffraction, FTIR, 1H NMR spectrum and MS. The crystals are monoclinic, space group Pbca with a = 10.0466(19), b = 9.6067(17), c = 20.790(3) Å, α = 90.00, b = 90.00, g = 90.00°, V = 2006.5(6) Å 3, Z = 8, F(000) = 784.00, Dc = 1.233 g/cm 3, μ = 0.815 cm -1, the final R = 0.0567 and wR = 0.1456. A total of 8716 reflections were collected, of which 1967 were independent (R int = 0.045). Theoretical calculation of the title compound was carried out with B3LYP/6-31G (d.p.). The full geometry optimization was carried out using 6-31G(d.p.) basis set and the frontier orbital energy. The structure-activity relationship was also studied. The preliminary biological test showed that the synthesized compound is bioactive against the ketol-acid reductoisomerase of Escherichia coli.

Xue Y.-L.,Jiangsu University | Zhang Y.-G.,Shandong Academy of Sciences | Liu X.-H.,Zhejiang University of Technology
Asian Journal of Chemistry | Year: 2012

A cyclopropane derivative, 1-cyano-N-(2,4-dichlorophenyl) cyclopropanecarboxamide (C11H8N2OCl2) was synthesized and its structure was studied by X-ray diffraction, FTIR, 1H NMR, MS and elemental analysis. The crystals are monoclinic, space group C2 with a = 14.387(9), b = 6.926(4), c = 12.237(7) A°, a = 90.00, b = 100.386(10), g = 90.00°, V = 1199.4(12) A°3, Z = 4, F(000) = 520, Dc = 1.413 g/cm3, μ = 0.520 cm-1, the final R = 0.0603 and wR = 0.1653. A total of 2976 reflections were collected, of which 1134 were independent (Rint = 0.0381). The preliminary biological test showed that the synthesized compound is bioactive against the KARI of Escherichia coli.

Wu Y.,Jiangsu University | Han M.,Shanghai Normal University
International Journal of Bifurcation and Chaos | Year: 2013

In this paper, the number and distributions of limit cycles of a planar quartic vector field are considered. Through perturbation technique and qualitative analysis of differential equation, it is shown that the quartic vector field has 21 limit cycles as parameters satisfy proper conditions. The distributions of limit cycles in the above perturbed planar quartic vector field are also presented. © 2013 World Scientific Publishing Company.

Gao Y.,University of Maryland University College | Gao Y.,Jiangsu University | Hu M.,University of Maryland University College | Mi B.,University of Maryland University College
Journal of Membrane Science | Year: 2014

Taking advantage of the unique property of graphene oxide (GO) nanomaterials in expanding the light-response range of TiO2, we modified the surface of water filtration membranes with TiO2-GO to enhance their photocatalytic activities under both UV and sunlight irradiations. A layer-by-layer approach was employed to sequentially deposit TiO2 nanoparticles and GO nanosheets on a polysulfone base membrane, with GO partially reduced via ethanol/UV post-treatment. The grafting of TiO2-GO on the membrane surface was confirmed through the analysis of QCM-D measurements and SEM images. We then studied the photocatalytic properties of the surface-modified membranes in both batch and filtration experiments using methylene blue (MB) as a representative organic contaminant. Compared with polysulfone membranes surface-modified with TiO2 and GO, respectively, the TiO2-GO membrane exhibited significantly improved MB photodegradation kinetics under UV (about 60-80% faster) and sunlight (3-4 times faster). Besides, the membrane flux increased as a result of the photo-enhanced hydrophilicity and contaminant degradation. Therefore, surface modification by TiO2-GO grafting provides a very promising route to the fabrication of high-performance photocatalytic membranes for sustainable water treatment. © 2014 Elsevier B.V.

Xue Y.-L.,Jiangsu University | Zhang Y.-G.,Shandong Academy of Sciences | Liu X.-H.,Zhejiang University of Technology
Asian Journal of Chemistry | Year: 2012

A cyclopropane derivative, 1-cyano-N-(4-bromophenyl)cyclopropanecarboxamide (C11H9N2OBr) was synthesized and its structure was studied by X-ray diffraction, FTIR, 1H NMR spectrum and MS. The crystal is triclinic, space group P-1 with α = 8.902(4), β = 10.944(5), c = 12.733(6) Å, α = 103.753(8), β = 106.812(9), γ = 104.004(9)°, V = 1087.1(9) Å3, Z = 4, F(000) = 528, Dc = 1.620 g/cm 3, the final R = 0.0604 and wR = 0.1197. A total of 5404 reflections were collected of which 3790 were independent (Rint = 0.0578). There are two intramolecular hydrogen bonds in the crystal lattice. The preliminary biological test showed that the synthesized compound had weak activity against the KARI of Escherichia coli.

Liu X.,Jiangsu University | Li H.-N.,Academia Sinica, Taiwan | Li H.-N.,National Tsing Hua University | Li H.-N.,National Cheng Kung University | Xiao Z.-J.,Nanjing Normal University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We point out that the recent Belle measurements of the B d/s→J/ψη( ′) decays imply large pseudoscalar glueball contents in the η( ′) meson. These decays are studied in the perturbative QCD approach, considering the η-η ′-G mixing, where G represents the pseudoscalar glueball. We show that the perturbative QCD predictions for the B d/s→J/ψη( ′) branching ratios agree well with the data for the mixing angle G30° between the flavor-singlet state and the pure pseudoscalar glueball. Extending the formalism to the η-η ′-G-η c tetramixing, the abnormally large observed B d→Kη ′ branching ratios are also explained. The proposed mixing formalism is applicable to other heavy meson decays into η( ′) mesons, and could be tested by future LHC beauty experiments and Super-B factory data. © 2012 American Physical Society.

Liu X.,Jiangsu University | Li H.-N.,Academia Sinica, Taiwan | Xiao Z.-J.,Nanjing Normal University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2016

We extend the perturbative QCD formalism including the Glauber gluons, which has been shown to accommodate the measured B→ππ and B0→ρ0ρ0 branching ratios simultaneously, to the analysis of the B→Kπ and KK¯ decays. It is observed that the convolution of the universal Glauber phase factors with the transverse-momentum-dependent kaon wave function reveals weaker (stronger) Glauber effects than in the pion (ρ meson) case as expected. Our predictions for the branching ratios and the direct CP asymmetries of the B→Kπ and KK¯ modes at next-to-leading-order accuracy agree well with data. In particular, the predicted difference of the B±→K±π0 and B0→K±π direct CP asymmetries, ΔAKπ≡ACPdir(K±π0)[0.021±0.016]-ACPdir(K±π)[-0.081±0.017]=0.102±0.023, is consistent with the measured ΔAKπ=0.119±0.022 within uncertainties, and the known B→Kπ puzzle is resolved. The above B→ππ, Kπ and KK¯ studies confirm that the Glauber gluons associated with pseudo-Nambu-Goldstone bosons enhance the color-suppressed tree amplitude significantly, but have a small impact on other topological amplitudes. © 2016 American Physical Society.

Ren J.,Jiangsu University | Xu Y.,Jiangsu University | Liu J.,Hong Kong Baptist University
Physica A: Statistical Mechanics and its Applications | Year: 2015

In this paper, a new model of computer virus-antivirus propagation dynamics based on the topology nature of the Internet is established. We analyze theoretically the complex dynamics of the model and it is found that, unlike the existing models, the model admits two virus-free equilibria and possesses possibly two virus equilibria: one being antivirus-independent and the other being antivirus-dependent. Furthermore, the stability of virus-free equilibria is analyzed via a threshold value associated with the topology of the Internet and the model parameters. It is established that, if the threshold value is less than or equal to the unity, the virus-free equilibria are alternatively globally attractive, resulting in virus eradication, while if the threshold value is greater than unity, the antivirus-independent virus equilibrium is globally asymptotically stable, leading to virus diffusion, while the antivirus-dependent virus equilibrium also is globally asymptotically stable. Some numerical examples are presented to illustrate the analytical results. © 2014 Elsevier B.V. All rights reserved.

Kang C.,Jiangsu University | Kang C.,University of Minnesota | Liu H.,Jiangsu University | Yang X.,Jiangsu University
Renewable and Sustainable Energy Reviews | Year: 2014

The Savonius wind turbine bears unique features in both aspects of rotor structure and torque production. Continual improvement of the Savonius wind turbine motivates the authors of this review to gather, classify and discuss the quintessential parts of the relevant studies. Unambiguous priority is granted to the turbulent flow surrounding the Savonius wind rotor. Flow patterns near the Savonius wind rotor are represented with distributions of static pressure near conventional and spiral Savonius wind rotors. Assorted geometric shapes of Savonius wind rotors are demonstrated to illuminate a panorama of the development of the Savonius wind rotor, as well as to highlight the connection between rotor-based solid boundary and flow structures near Savonius wind rotor blades. Limitations of existing analytical methods used to predict the performance of the Savonius wind rotor are interpreted. Advantages of both numerical and experimental techniques in acquiring aerodynamics forces, shaft torque and internal stress distribution for the Savonius wind rotor blade are enumerated, and the difficulties incurred by curved blades and the rotation of the rotor are analyzed as well. Optimal values of tip-speed ratio corresponding to maximum power coefficient or maximum torque coefficient are different for various geometric shapes of Savonius wind rotors, which sheds new light upon the relationship between flow characteristics and performance parameters associated with the Savonius wind rotor. © 2014 Elsevier Ltd.

Peng R.,Jiangsu University | Peng R.,University of Minnesota | Yi F.,Harbin Engineering University
Physica D: Nonlinear Phenomena | Year: 2013

Identifying the epidemic risk for infectious disease is crucial in order to effectively perform control measures. In a series of our work, from an analytical aspect we study the effects of epidemic risk and population movement on the spatiotemporal transmission of infectious disease via an SIS epidemic reaction-diffusion model proposed by Allen et al. (2008) in [36]. In Allen et al. (2008) [36], Peng (2009) [37], it was assumed that the habitat of the populations consists of only the low and high risk areas. The present paper concerns a more complicated heterogeneous environment where the moderate risk area occurs, and deals with two cases: (i) only the moderate and high risk areas exist; (ii) the low, moderate and high risk areas coexist. In each case, we rigorously determine the asymptotic profile of the positive steady state (i.e., the endemic equilibrium) as the migration rate of either the susceptible or infected population tends to zero. Our results show how epidemic risk and population movement affect the spatial distribution of infectious disease and thereby suggest important implications for predicting the patterns of disease occurrence and designing optimal control strategies. Numerical simulations are carried out to support the theoretical results. © 2013 Elsevier B.V. All rights reserved.

Zhu Z.,Jiangsu University | Sun Y.,Nanjing Institute of Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

To realize the rotor displacement self-sensing for a 3-degree-of-freedom hybrid magnetic bearing (3-DOF- HMB). This paper presents a novel predictive modeling method of rotor displacement for 3-DOF-HMB using particle swarm optimized-least squares support vector machines (PSO- LS-SVM). First, the structure and working principle of 3-DOF-HMB is explained and the nonlinear mathematical model in the large air-gap is derived. Then, through the collection of representative current displacement data based on the nonlinear model, the predictive model of 3-DOF-HMB is obtained by training LS-SVM. Besides, the PSO algorithm is used to optimize parameters of LS-SVM to improve the performance of the predictive model. Finally, take mean squared error (MSE) and absolute error (AE) as model evaluation index to conduct comparative simulation research. The result is discussed and the effectiveness of predictive modeling and self-sensing method is verified. © 2012 Chin. Soc. for Elec. Eng.

Kang C.,University of Minnesota | Liu H.,Jiangsu University
Journal of Fluids Engineering, Transactions of the ASME | Year: 2014

A plane water jet issuing into quiescent air at a Reynolds number of 2.5 × 105 is experimentally studied using phase Doppler anemometry (PDA). The plane water jet contains a coherent central region, which is situated immediately downstream of the nozzle exit. Particular emphasis is placed upon the distinctive attributes of such a region. Both mean flow pattern and turbulent features are obtained statistically based upon instantaneous velocity data. The central region is overwhelmingly dominated by uniformly distributed velocity, and remarkably high velocity gradient is present near the boundary of this region. Evidence shows that self-preservation is not satisfied in the central region. Explicit energy dissipation mechanisms in the central region are appreciated from cross-sectional uniform distributions of Kolmogorov length scales. Turbulent kinetic energy increases as the plane jet progresses, which is opposite to the general tendency associated with self-preservation. Although the central region is filled with near-zero Reynolds shear stress, distributions of skewness and flatness in this region are non-Gaussian and the instability caused by small-scale flow structures is thereby substantiated. Copyright © 2014 by ASME.

Wu D.J.,Nanjing University | Wu D.J.,Jiangsu University | Liu X.J.,Nanjing University | Liu X.J.,Xi'an Jiaotong University
Applied Physics Letters | Year: 2010

The near-field enhancement of silica-silver-gold (SSG) nanoshells has been investigated by using Mie theory. If the thickness of Au shell is smaller than 5 nm, the maximum of near-field for SSG increases first and then decreases with increasing Ag layer thickness. Thus, the near-field for SSG can be modified by Ag layer and can possess more excellent near-field enhancement. If the thickness of Au shell is larger than 10 nm, the maximum of near-field of SSG nanoshell decreases with increasing Ag layer thickness. We further discuss the influence of Au shell thickness on the near-field of SSG nanoshell. © 2010 American Institute of Physics.

Ho T.-T.,University of Mississippi Medical Center | Zhou N.,University of Mississippi Medical Center | Huang J.,University of Mississippi Medical Center | Koirala P.,University of Mississippi Medical Center | And 4 more authors.
Nucleic Acids Research | Year: 2015

The CRISPR/Cas has been recently shown to be a powerful genome-editing tool in a variety of organisms. However, these studies are mainly focused on protein-coding genes. The present study aims to determine whether this technology can be applied to non-coding genes. One of the challenges for knockout of non-coding genes is that a small deletion or insertion generated by the standard CRISPR/Cas system may not necessarily lead to functional loss of a given non-coding gene because of lacking an open reading frame, especially in polyploidy human cell lines. To overcome this challenge, we adopt a selection system that allows for marker genes to integrate into the genome through homologous recombination (HR). Moreover, we construct a dual guide RNA vector that can make two cuts simultaneously at designated sites such that a large fragment can be deleted. With these approaches, we are able to successfully generate knockouts for miR-21, miR-29a, lncRNA-21A, UCA1 and AK023948 in various human cell lines. Finally, we show that the HR-mediated targeting efficiency can be further improved by suppression of the non-homologous end joining pathway. Together, these results demonstrate the feasibility of knockout for non-coding genes by the CRISPR/Cas system in human cell lines. © The Author(s) 2014. Published by Oxford University Press on behalf of Nucleic Acids Research.

Gui G.,Jiangsu University | Gui G.,Chinese University of Hong Kong | Liu Y.,University of Texas at Arlington | Olver P.J.,University of Minnesota | Qu C.,Ningbo University
Communications in Mathematical Physics | Year: 2013

In this paper, we investigate the formation of singularities and the existence of peaked traveling-wave solutions for a modified Camassa-Holm equation with cubic nonlinearity. The equation is known to be integrable, and is shown to admit a single peaked soliton and multi-peakon solutions, of a different character than those of the Camassa-Holm equation. Singularities of the solutions can occur only in the form of wave-breaking, and a new wave-breaking mechanism for solutions with certain initial profiles is described in detail. © 2012 Springer-Verlag.

Liu W.Y.,Jiangsu University | Zhang W.H.,Nanjing Institute of Technology | Han J.G.,Jiangsu University | Wang G.F.,Jiangsu University
Renewable Energy | Year: 2012

This paper proposed a novel wind turbine fault diagnosis method based on the local mean decomposition (LMD) technology. Wind energy is a renewable power source that produces no atmospheric pollution. The condition monitoring and fault diagnosis in wind turbine system are important in avoiding serious damage. Vibration analysis is a normal and useful technology in wind turbine condition monitoring and fault diagnosis. However, the relatively slow speed of the wind turbine components set a limitation in early fault diagnosis using vibration monitoring method. The traditional time-frequency analysis techniques have some drawbacks which make them not suitable for the nonlinear, non-Gaussian signal analysis. LMD is a new iterative approach to demodulate amplitude and frequency modulated signals, which is suitable for obtaining instantaneous frequencies in wind turbine condition monitoring and fault diagnosis. The experiment analysis of the wind turbine vibration signal proves the validity and availability of the new method. © 2012 Elsevier Ltd.

Wang Z.-Q.,Nanjing Institute of Technology | Wang Z.-Q.,Jiangsu University | Liu X.-X.,Jiangsu University
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2013

The bearingless induction motor is a nonlinear, multi-variable and strongly coupled system. For this system, a novel internal model control strategy based on neural network ffth-order inverse system theory is proposed in this paper to realize the decoupling control. By cascading the αth-order inverse model approximated by the dynamic neural network with the original system, the nonlinear bearingless induction motor system is decoupled into four independent pseudo-linear subsystems, that is, two radial displacement subsystems, a speed subsystem and a rotor flux subsystem. Then, the internal model control method is introduced to the four pseudo-linear subsystems to ensure the robustness and antijamming ability of the closed-loop system. The effectiveness and superiority of the proposed strategy are demonstrated by simulation and experiment. Copyright © 2013 Acta Automatica Sinica.

Zhang Z.,Jiangsu University | Zhang N.,Xi'an University of Architecture and Technology | Feng Z.,Xi'an Jiaotong University
Expert Systems with Applications | Year: 2014

The multi-satellite control resource scheduling problem (MSCRSP) is a kind of large-scale combinatorial optimization problem. As the solution space of the problem is sparse, the optimization process is very complicated. Ant colony optimization as one of heuristic method is wildly used by other researchers to solve many practical problems. An algorithm of multi-satellite control resource scheduling problem based on ant colony optimization (MSCRSP-ACO) is presented in this paper. The main idea of MSCRSP-ACO is that pheromone trail update by two stages to avoid algorithm trapping into local optima. The main procedures of this algorithm contain three processes. Firstly, the data get by satellite control center should be preprocessed according to visible arcs. Secondly, aiming to minimize the working burden as optimization objective, the optimization model of MSCRSP, called complex independent set model (CISM), is developed based on visible arcs and working periods. Ant colony algorithm can be used directly to solve CISM. Lastly, a novel ant colony algorithm, called MSCRSP-ACO, is applied to CISM. From the definition of pheromone and heuristic information to the updating strategy of pheromone is described detailed. The effect of parameters on the algorithm performance is also studied by experimental method. The experiment results demonstrate that the global exploration ability and solution quality of the MSCRSP-ACO is superior to existed algorithms such as genetic algorithm, iterative repair algorithm and max-min ant system. © 2013 Elsevier Ltd. All rights reserved.

Liu W.Y.,Jiangsu University | Liu W.Y.,Case Western Reserve University
Engineering Structures | Year: 2013

Renewable energy sources especially wind energy have gained much attention due to the recent energy crisis and the urge to obtain clean energy. To maintain the wind turbine in operation healthily, implementation of condition monitoring system and fault detection system is necessary. In wind turbine condition monitoring, vibration analysis is a common and affective way to apply in the feature extraction and fault diagnosis, especially in the rotation parts. The blade-cabin-tower coupling system is analyzed in this paper. At first, the coordinate system and the kinetic equation are established. The tower natural frequency is calculated based on the coordinate system and the random following wind vibration is analyzed. In the end, the total wind force in blade-cabin-tower coupling system is solved. © 2013 Elsevier Ltd.

Hong B.,Nanjing Institute of Technology | Lu D.,Jiangsu University
Mathematical and Computer Modelling | Year: 2012

In this paper, an improved general mapping deformation method based on the generalized Jacobi elliptic functions expansion method with computerized symbolic computation is used to construct more new exact solutions of a generalized KdV equation with variable coefficients. As a result, seven families of new generalized Jacobi elliptic function-like solutions, soliton-like solutions and trigonometric function solutions of the equation are obtained by using this method, which shows that the general method is more powerful and will be used in further works to establish more entirely new solutions for other kinds of nonlinear partial differential equations arising in mathematical physics. © 2011 Elsevier Ltd.

Mao C.,Jiangxi University of Finance and Economics | Mao C.,Wuhan University | Xiao L.,Jiangxi University of Finance and Economics | Yu X.,Jiangxi University of Finance and Economics | Chen J.,Jiangsu University
Swarm and Evolutionary Computation | Year: 2015

In general, software testing has been viewed as an effective way to improve software quality and reliability. However, the quality of test data has a significant impact on the fault-revealing ability of software testing activity. Recently, search-based test data generation has been treated as an operational approach to settle this difficulty. In the paper, the basic ACO algorithm is reformed into discrete version so as to generate test data for structural testing. First, the technical roadmap of combining the adapted ACO algorithm and test process together is introduced. In order to improve algorithm's searching ability and generate more diverse test inputs, some strategies such as local transfer, global transfer and pheromone update are defined and applied. The coverage for program elements is a special optimization objective, so the customized fitness function is constructed in our approach through comprehensively considering the nesting level and predicate type of branch. To validate the effectiveness of our ACO-based test data generation method, eight well-known programs are utilized to perform the comparative analysis. The experimental results show that our approach outperforms the existing simulated annealing and genetic algorithm in the quality of test data and stability, and is comparable to particle swarm optimization-based method. In addition, the sensitivity analysis on algorithm parameters is also employed to recommend the reasonable parameter settings for practical applications. © 2014 Elsevier B.V. All rights reserved.

Wang Y.,York College - The City University of New York | Bi Q.,Jiangsu University
Nonlinear Dynamics | Year: 2012

The bifurcation phenomena of a compound K(m,m) equation are investigated in this paper. Three singular lines have been found in the associated topological vector field, which may evolve in the phase trajectories of the system. The influence of parameters as well as the singular lines on the properties of the equilibrium points has been explored in details. Transition boundaries have been obtained to divide the parameter space into regions associated with different types of phase trajectories. The existence conditions and related discussions for different traveling wave solutions have been presented in the end. © Springer Science+Business Media B.V. 2012.

Wang L.,Beijing Institute of Technology | Gao C.,Beijing Institute of Technology | Gao M.,Beijing Institute of Technology | Li Y.,Beijing Institute of Technology | And 3 more authors.
Optics Express | Year: 2014

We demonstrated a Q-switched Ho:YAG ceramic laser operating at 2097 nm. The Ho:YAG ceramic laser was resonantly pumped by a Tm:YLF laser at 1908 nm. The laser performance with two Ho-doping concentrations of Ho:YAG ceramics in a U-shaped resonator was studied. Different pump spots were investigated to obtain high extract efficiency. The wavelength of Ho:YAG ceramic laser was tuned from 2090.70 nm to 2098.10 nm. The Q-switched pulse energy were 9.6 mJ at a pulse repetition frequency (PRF) of 200 Hz and 10.2 mJ at a PRF of 100 Hz, respectively. The beam quality M2 factors were measured to be less than 1.1 in both directions. © 2014 Optical Society of America.

Wang D.D.,Jiangsu University | Xing G.Z.,University of New South Wales | Yan F.,Harvard University | Yan Y.S.,Jiangsu University | Li S.,University of New South Wales
Applied Physics Letters | Year: 2014

To reveal the mechanism responsible for ferromagnetism in transition metal and hole codoped oxide semiconductors, we carry out a comparative study on Mn-doped and (Mn, N)-codoped ZnO nanopillars. Compared with Mn-doped ZnO samples, (Mn, N)-codoped ZnO nanopillars exhibit an enhanced room temperature ferromagnetism. The modulation of bound magnetic polarons via Mn and N codoping corroborates the correlation between the ferromagnetism and hole carriers, which is also verified by first-principles density functional theory calculations. Our study suggests that the electronic band alteration as a result of codoping engineering plays a critical role in stabilizing the long-range magnetic orderings. © 2014 AIP Publishing LLC.

Dai J.,Jiangsu University | Mai F.,University of Hong Kong
Signal Processing | Year: 2012

This paper presents a novel algorithm for the initial configuration to the model selection problem in the two-class support vector machine (SVM) classification when fitting the entire path of SVM solutions for every value of the regularization parameter. Instead of using quadratic programming for initialization in the conventional two-class SVM regularization path fitting methods, we propose a piecewise linear method which reduces the computational cost significantly. Furthermore, an efficient treatment is provided to deal with the singular case where the data set contains linearly dependent points, duplicate points or nearly duplicate points. The performance of the proposed algorithm in terms of computational complexity and the ability to handle singular cases are backed by strict mathematical analysis and proof, and verified by the experimental results. © 2011 Elsevier B.V. All rights reserved.

Zou D.,Jiangsu University | Wu J.,Northeastern University China | Gao L.,Northeastern University China | Li S.,University of South Australia
Neurocomputing | Year: 2013

A modified differential evolution algorithm (MDE) is proposed to solve unconstrained optimization problems in this paper. Gauss distribution and uniform distribution have one thing in common, that is randomness or indeterminateness. Due to this characteristic, MDE employs both distributions to adjust scale factor and crossover rate, which is useful to increase the diversity of the entire population. To guarantee the quality of the swarm, MDE uses an external archive, and some solutions of high quality in this external archive can be selected for candidate solutions. MDE adopts two common mutation strategies to produce new solutions, and the information of global best solution is more likely to be utilized for the mutation during late evolution process, which is beneficial to improving the convergence of the proposed algorithm. In addition, a central solution is generated in terms of all the other candidate solutions, and it can provide a potential searing direction. Experimental results show that MDE algorithm can yield better objective function values than the other six DE algorithms for some unconstrained optimization problems, thus it is an efficient alternative on solving unconstrained optimization problems. © 2013 Elsevier B.V.

Mao X.,Guangzhou Zhujiang Steel Co. | Huo X.,Jiangsu University | Sun X.,Control Iron and Steel Research Institute, China | Chai Y.,Guangzhou Zhujiang Steel Co.
Journal of Materials Processing Technology | Year: 2010

A new hot rolled titanium-microalloyed steel with yield strength of 700 MPa has been developed by CSP (compact strip production) process based on commercial weather resistant steel. EBSD results showed that the average size of its grains with high angle boundaries (>15°) was 3.3 μm. High-density dislocations and large number of nanometer particles were observed in the steel product by TEM. X-ray analysis on the electrolytically extracted phase from the steel indicated that fraction of MX phase was 0.0793 wt%, in which the particles smaller than 10 nm accounted for 33.7%. The contribution of precipitation hardening resulting from nanometer particles was calculated as approximate 158 MPa. The commercial weather resistant steel, reference steel for comparison with 450 MPa yield strength, was also prepared and investigated. It can be concluded that grain refinement is still a major strengthening mechanism in this high strength steel, but precipitation hardening of nanometer TiC precipitates is the dominant factor to increasing the yield strength in new developed steel compared with the reference steel. © 2010 Elsevier B.V.

Chen Q.,Jiangsu University | Xiao D.-S.,Guangzhou University
Nitric Oxide - Biology and Chemistry | Year: 2014

Adult hippocampus is highly vulnerable to iron-induced oxidative stress. Aerobic exercise has been proposed to reduce oxidative stress but the findings in the hippocampus are conflicting. This study aimed to observe the changes of redox-active iron and concomitant regulation of cellular iron homeostasis in the hippocampus by aerobic exercise, and possible regulatory effect of nitric oxide (NO). A randomized controlled study was designed in the rats with swimming exercise treatment (for 3 months) and/or an unselective inhibitor of NO synthase (NOS) (L-NAME) treatment. The results from the bleomycin-detectable iron assay showed additional redox-active iron in the hippocampus by exercise treatment. The results from nonheme iron content assay, combined with the redox-active iron content, showed increased storage iron content by exercise treatment. NOx (nitrate plus nitrite) assay showed increased NOx content by exercise treatment. The results from the Western blot assay showed decreased ferroportin expression, no changes of TfR1 and DMT1 expressions, increased IRP1 and IRP2 expression, increased expressions of eNOS and nNOS rather than iNOS. In these effects of exercise treatment, the increased redox-active iron content, storage iron content, IRP1 and IRP2 expressions were competely reversed by L-NAME treatment, and decreased ferroportin expression was in part reversed by L-NAME. L-NAME treatment completely inhibited increased NOx and both eNOS and nNOS expression in the hippocampus. Our findings suggest that aerobic exercise could increase the redox-active iron in the hippocampus, indicating an increase in the capacity to generate hydroxyl radicals through the Fenton reactions, and aerobic exercise-induced iron accumulation in the hippocampus might mainly result from the role of the endogenous NO.© 2013 Elsevier Inc. All rights reserved.

Yang C.,University of Hong Kong | Zhou M.,University of Hong Kong | Xu Q.,Jiangsu University
Physical Chemistry Chemical Physics | Year: 2013

MnO2/carbon composites with ultrathin MnO2 nanofibers (diameter of 5-10 nm) uniformly deposited on three dimensional ordered macroporous (3DOM) carbon frameworks were fabricated via a self-limiting redox process. The MnO2 nanofibers provide a large surface area for charge storage, whereas the 3DOM carbon serves as a desirable supporting material providing rapid ion and electron transport through the composite electrodes. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) were used to characterize the capacitive performance of these composites. Optimization of the composition results in a composite with 57 wt% MnO2 content, which gives both a high specific capacitance (234 F g-1 at a discharge current of 0.1 A g-1) and good rate capability (52% retention of the capacitance at 5 A g-1). An asymmetric supercapacitor was fabricated by assembling the optimized MnO 2/carbon composite as the positive electrode and 3DOM carbon as the negative electrode. The asymmetric supercapacitor exhibits superior electrochemical performances, which can be reversibly charged and discharged at a maximum cell voltage of 2.0 V in 1.0 M Na2SO4 aqueous electrolyte, delivering both high energy density (30.2 W h kg-1) and power density (14.5 kW kg-1). Additionally, the asymmetric supercapacitor exhibits an excellent cycle life, with 95% capacitance retained after 1000 cycles. © 2013 The Owner Societies.

Wang M.,Jiangsu University | Jung Kim E.,University of Ulsan | Hong Hahn S.,University of Ulsan
Journal of Luminescence | Year: 2011

The effect of annealing atmosphere, temperature and aging on the photoluminescence of pure and Li-doped ZnO thin films has been investigated. Annealing the pure ZnO in N2 and He above 800 °C results in green emission centered at ca. 500 nm; however annealing in air red-shifts the green emission to 527 nm. The visible emission of the Li-doped ZnO is found to be largely dependent on the annealing atmosphere. Warm-white photoluminescence with a broad emission band covering nearly the whole visible spectrum is obtained for the Li-doped ZnO films annealed in helium. The substitutional and interstitial extrinsic point defects created by lithium doping may mediate the relative concentration of the intrinsic defects and thereby tune the intrinsic-defect-related visible emission. The enhanced intensity ratio of near-band-edge ultraviolet emission to deep-level visible emission with aging time may be ascribed to both in-diffusion of oxygen from air and self-diffusion of oxygen interstitials to heal the oxygen vacancies during the aging process. © 2011 Elsevier B.V. All rights reserved.

Yang M.,University of Hong Kong | Rui K.,Jiangsu University | Wang S.,Jiangsu University | Lu L.,University of Hong Kong
Cellular and Molecular Immunology | Year: 2013

B cells are generally considered to be positive regulators of the immune response because of their capability to produce antibodies, including autoantibodies. The production of antibodies facilitates optimal CD4 + T-cell activation because B cells serve as antigen-presenting cells and exert other modulatory functions in immune responses. However, certain B cells can also negatively regulate the immune response by producing regulatory cytokines and directly interacting with pathogenic T cells via cell-to-cell contact. These types of B cells are defined as regulatory B (Breg) cells. The regulatory function of Breg cells has been demonstrated in mouse models of inflammation, cancer, transplantation, and particularly in autoimmunity. In this review, we focus on the recent advances that lead to the understanding of the development and function of Breg cells and the implications of B cells in human autoimmune diseases. © 2013 CSI and USTC. All rights reserved.

Huang Z.,Jiangsu University | Yuan H.,CAS Academy of Opto Electronics
Radio Science | Year: 2014

In this article a radial basis function (RBF) neural network improved by Gaussian mixture model is developed to be used for forecasting ionospheric 30 min total electron content (TEC) data given the merits of its nonlinear modeling capacity. In order to understand more about the response of developed network model with respect to stations situated at different latitude, estimated TEC overhead of GPS ground stations BJFS (39.61°N, 115.89°E), WUHN (30.53°N, 114.36°E), and KUNM (25.03°N, 102.80°E) for 6 months in 2011 are used for training data set, validating data and test data set of RBF network model. The performance of the trained model is evaluated at a set of criteria. Our results show that the predicted TEC is in good agreement with observations with mean relative error of about 9% and root-mean-square error of less than 5 total electron content unit, 1 TECU = 1016 el m -2. Our comparison further indicates that RBF network offers a powerful and reliable tool for the design of ionospheric TEC forecast. ©2014. American Geophysical Union. All Rights Reserved.

Min C.,Jiangsu University | Nie P.,Jiangsu University | Song H.-J.,Jiangsu University | Zhang Z.,CAS Lanzhou Institute of Chemical Physics | Zhao K.,Jiangsu University
Tribology International | Year: 2014

The polyimide (PI)/graphene oxide (GO) nanocomposite films were synthesized by situ polymerization and their tribological behaviors under dry friction, pure water lubrication and seawater lubrication were comparatively investigated. The results showed that PI/GO exhibited better tribological properties under seawater-lubricated condition than other conditions because of excellent lubricating effect of seawater. Besides, the wear resistance of PI had been greatly improved by filling GO under seawater lubrication and reached the top when the content of GO was 0.5 wt%, because strong interfacial adhesion between PI matrix and GO nanofillers could transfer load effectively between the contact surfaces. © 2014 Elsevier Ltd.

Pan L.,Jiangsu University | Pan L.,Stanford University | Chortos A.,Stanford University | Yu G.,University of Texas at Austin | And 6 more authors.
Nature Communications | Year: 2014

Pressure sensing is an important function of electronic skin devices. The development of pressure sensors that can mimic and surpass the subtle pressure sensing properties of natural skin requires the rational design of materials and devices. Here we present an ultra-sensitive resistive pressure sensor based on an elastic, microstructured conducting polymer thin film. The elastic microstructured film is prepared from a polypyrrole hydrogel using a multiphase reaction that produced a hollow-sphere microstructure that endows polypyrrole with structure-derived elasticity and a low effective elastic modulus. The contact area between the microstructured thin film and the electrodes increases with the application of pressure, enabling the device to detect low pressures with ultra-high sensitivity. Our pressure sensor based on an elastic microstructured thin film enables the detection of pressures of less than 1 Pa and exhibits a short response time, good reproducibility, excellent cycling stability and temperature-stable sensing. © 2014 Macmillan Publishers Limited. All rights reserved.

Zhang Q.,Jiangsu University | Liu X.,Jiangsu University | Liu D.,Guangzhou University | Gai H.,Jiangsu University
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2014

In this paper, we present a novel method to generate ultra-small droplets via volatile component evaporation. By regulating the composition of the binary solvent, the volume ratio of the high saturated vapor pressure component, and the flow rate ratio of the two phases, monodisperse ultra-small water or nonvolatile organic droplets can be formed. This method is flexible, versatile, and compatible with tip-streaming or nanofluidics, and may have potential applications in single molecule assay, colloid synthesis, and block copolymer assembly. © 2014 the Partner Organisations.

Yang M.,University of Hong Kong | Sun L.,Nanjing Medical University | Wang S.,Jiangsu University | Ko K.-H.,University of Hong Kong | And 4 more authors.
Journal of Immunology | Year: 2010

Although B cells have been shown to possess a regulatory function, microenvironmental factors or cytokines involved in the induction of regulatory B cells remain largely uncharacterized. B cell-activating factor (BAFF), a member of TNF family cytokines, is a key regulator for Bcell maturation and function. In this study, we detected significantly increased numbers of IL-10-producing B cells in BAFF-treated B cell cultures, an effect specifically abrogated by neutralization of BAFF with TACIFc. BAFF-induced IL-10-producing B cells showed a distinct CD1dhiCD5+ phenotype, which were mainly derived from marginal zone B cells. Moreover, BAFF activated transcription factor AP-1 for binding to IL-10 promoter. Notably, BAFF treatment in vivo increased the number of IL-10-producing B cells in marginal zone regions. Furthermore, BAFF-induced IL-10-producing B cells possess a regulatory function both in vitro and in vivo. Taken together, our findings identify a novel function of BAFF in the induction of IL-10-producing regulatory B cells. Copyright © 2010 by The American Association of Immunologists, Inc.

Jiangsu University and Nanjing Fenggong Agricultural Science & Technology Co. | Date: 2014-09-02

A method for detecting the similarity of the patent documents based on a new kernel function Luke kernel comprises: dividing a patent document into five elements, i.e. patent title, abstract, claims, description, and main classification, constructing a new kernel function Luke kernel, calculating the similarity of the first four elements of two patent documents by using the Luke kernel, calculating the similarity between the main classifications of the two patent documents by means of character string matching, and then performing a weighted summation of the similarities of the five elements of the two patent documents to obtain an overall similarity of the patent documents. The method further improves the precision and recall in detecting the similarity of the patent documents, and can be applied to detection for the similarity of the patent documents.

Zheng Y.-G.,Dalian University of Technology | Ye H.-F.,Dalian University of Technology | Zhang Z.-Q.,Dalian University of Technology | Zhang Z.-Q.,Jiangsu University | Zhang H.-W.,Dalian University of Technology
Physical Chemistry Chemical Physics | Year: 2012

The mutual effects of two crucial features of carbon nanotubes (CNTs) (surface and confinement) on the temperature-dependent water diffusion are studied through molecular dynamics simulations. A two-stage diffusion mechanism is detected in the CNTs of diameter smaller than 12.2 , which becomes obscure as the temperature increases. This peculiar phenomenon can be ascribed to the cooperation of the small confinement and the periodic surface. The diffusion coefficient of the confined water exhibits a nonmonotonic dependence on the confinement size and an unexpected increase inside the large CNTs (compared to that of bulk water). These anomalous behaviors can be attributed to the competition of the smooth surface and the small confinement. Considering the mutual effects, an empirical formula is proposed on the basis of two groups of numerical examples, whose results indicate that the confinement effect will dominate over the surface effect until the CNT diameter increases up to ∼16 , whereas thereafter the surface effect becomes dominant and finally both of them vanish gradually. © 2011 The Owner Societies.

Chen M.-Y.,Jiangsu University | Zhou J.,Ningbo University
Optics Express | Year: 2014

A multi-core fiber coupler is proposed to extract one of the modes in a few-mode optical fiber from a light beam, leaving the other modes undisturbed, and allowing a new signal to be retransmitted on that mode. Selective coupling of higher-order modes from a few-mode optical fiber can be realized by increasing the coupling length difference of the modes in the fiber using the multi-core configuration. Low cross-talk and wide bandwidth operation are realized owing to the fact that only one mode can be effectively coupled. © 2014 Optical Society of America.

Sun B.,Jiangsu University | Chen M.-Y.,Jiangsu University | Zhang Y.-K.,Jiangsu University | Yang J.-C.,Jiangsu University | And 2 more authors.
Optics Express | Year: 2011

We propose a novel photonic crystal fiber refractive index sensor which is based on the selectively resonant coupling between a conventional solid core and a microstructured core. The introduced microstructured core is realized by filling the air-holes in the core with low index analyte. We show that a detection limit (DL) of 2.02 × 10-6 refractive index unit (RIU) and a sensitivity of 8500 nm/RIU can be achieved for analyte with refractive index of 1.33. © 2011 Optical Society of America.

Qiao F.,Jiangsu University | Sang Y.,Dalian University of Technology
Journal of Materials Science: Materials in Electronics | Year: 2014

In this paper, vertically aligned CdSe/CdS nanorods multilayer was achieved via a novel and simple thermal annealing approach on silicon substrate. The high uniformity in morphology and structure of nanorods arrays was obtained by adjusting the annealing ramp and solution concentration. The mechanism of this self-assembly was explained by the thermally decomposed organics surrounding the nanorods through annealing process, which induces decreased interspace between nanorods and more freedom for nanorods self-assembly into ordered packing; the decrease in organic capping molecules was further confirmed by the thermogravimetric analysis and the fourier transform infrared spectroscopy results; and nanorods arrays showed effectively enhanced photo-induced charge transfer properties compared to that of random packing ones as tested in the surface photovoltage measurement. The results here may offer a way towards device-scale nanorods superlattices for application in photovoltaic devices. © 2014 Springer Science+Business Media New York.

Yang H.,China University of Mining and Technology | Qin Y.,China University of Mining and Technology | Feng G.,Jiangsu University | Ci H.,China University of Mining and Technology
IEEE Sensors Journal | Year: 2013

A remote online carbon dioxide (CO2) concentration monitoring system is developed, based on the technologies of wireless sensor networks, in allusion to the gas leakage monitoring requirement for CO2 capture and storage. The remote online CO2 monitoring system consists of monitoring equipment, a data center server, and the clients. The monitoring equipment is composed of a central processing unit (CPU), air environment sensors array, global positioning system (GPS) receiver module, secure digital memory card (SD) storage module, liquid crystal display (LCD) module, and general packet radio service (GPRS) wireless transmission module. The sensors array of CO2, temperature, humidity, and light intensity are used to collect data and the GPS receiver module is adopted to collect location and time information. The CPU automatically stores the collected data in the SD card data storage module and displays them on the LCD display module in real-time. Afterwards, the GPRS module continuously wirelessly transmits the collected information to the data center server. The online monitoring WebGIS clients are developed using a PHP programming language, which runs on the Apache web server. MySQL is utilized as the database because of its speed and reliability, and the stunning cross-browser web maps are created, optimized, and deployed with the OpenLayers JavaScript web-mapping library. Finally, an experiment executed in Xuzhou city, Jiangsu province, China is introduced to demonstrate the implementation and application. © 2001-2012 IEEE.

Borodich F.M.,University of Cardiff | Feng Z.,Jiangsu University
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2010

The same term, 'fractals' incorporates two rather different meanings and it is convenient to split the term into physical or empirical fractals and mathematical ones. The former term is used when one considers real world or numerically simulated objects exhibiting a particular kind of scaling that is the so-called fractal behaviour, in a bounded range of scales between upper and lower cutoffs. The latter term means sets having non-integer fractal dimensions. Mathematical fractals are often used as models for physical fractal objects. Scaling of mathematical fractals is considered using the Barenblatt-Borodich approach that refers physical quantities to a unit of the fractal measure of the set. To give a rigorous treatment of the fractal measure notion and to develop the approach, the concepts of upper and lower box-counting quasi-measures are presented. Scaling properties of the quasi-measures are studied. As examples of possible applications of the approach, scaling properties of the problems of fractal cracking and adsorption of various substances to fractal rough surfaces are discussed. © 2009 Birkhäuser Verlag Basel/Switzerland.

Zhang H.,Dalian University of Technology | Zhang Z.,Dalian University of Technology | Zhang Z.,Jiangsu University | Ye H.,Dalian University of Technology
Microfluidics and Nanofluidics | Year: 2012

Computational modeling and simulation can provide an effective predictive capability for flow properties of the confined fluids in micro/nanoscales. In this paper, considering the boundary slip at the fluid-solid interface, the motion property of fluids confined in parallel-plate nanochannels are investigated to couple the atomistic regime to continuum. The corrected second-order slip boundary condition is used to solve the Navier-Stokes equations for confined fluids. Molecular dynamics simulations for Poiseuille flows are performed to study the influences of the strength of the solid-fluid coupling, the fluid temperature, and the density of the solid wall on the velocity slip at the fluid boundary. For weak solid-fluid coupling strength, high temperature of the confined fluid and high density of the solid wall, the large velocity slip at the fluid boundary can be obviously observed. The effectiveness of the corrected second-order slip boundary condition is demonstrated by comparing the velocity profiles of Poiseuille flows from MD simulations with that from continuum. © 2011 Springer-Verlag.

Xie F.,Jiangsu University | Hou Y.,China University of Mining and Technology
Industrial Lubrication and Tribology | Year: 2011

Purpose - The purpose of this paper is to reveal the characteristics of hydrodynamic load capacity and torque transferred by oil film with variable viscosity, and the effect of groove number, width and depth on the hydrodynamic load capacity and torque transfer. Design/methodology/approach - The radial temperature of friction pair and viscosity of YLA-N32 hydraulic oil were measured through experiments, and a viscosity-diameter expression was deduced using polynomial fitting method. Analytical expressions for hydrodynamic load capacity and torque of the oil film were deduced based on hydrodynamic lubrication theory. Findings - The investigation shows the hydrodynamic load capacity and transferred torque with variable viscosity are much less than that with constant viscosity. Load capacity increases with the increase of groove depth which is the most significant influence factor, while it has the least influence on torque. Groove width has great influence on load capacity and torque. The load capacity increases with the increase of groove width; contrarily, torque decreases with the increase of groove width. Groove number has little influence on load capacity, while it has great influence on torque. The torque decreases with the increase of groove number. Originality/value - In this paper, analytical solutions for hydrodynamic load capacity and torque of the oil film with variable viscosity are deduced. The paper reveals the relationship between hydrodynamic load capacity, torque transfer and groove number, width and depth. © Emerald Group Publishing Limited.

Liu C.-M.,Jiangsu University | Sun Y.-Z.,Jiangsu University | Sun J.-M.,Jiangsu University | Ma J.-Q.,China University of Mining and Technology | Cheng C.,Jiangsu University
Biochimica et Biophysica Acta - General Subjects | Year: 2012

Background: Lead (Pb) exposure is considered as a risk factor for the development of renal dysfunction. The flavonoid quercetin (QE) in diets exerts the nephroprotective effects. This study investigated the effects of quercetin on renal oxidative stress and inflammation in rats exposed to Pb. Methods: Wistar rats were divided into normal, lead exposure groups, lead plus quercetin groups and quercetin groups. Rats were exposed to lead acetate in the drinking water (500 mg Pb/L) with or without quercetin co-administration (25 and 50 mg QU/kg intragastrically once daily). After 75 days, serum uric acid, urea, creatinine, renal reactive oxygen species (ROS) production, thiobarbituric acid reactive substances (TBARS) and histopathological analysis were performed. Pb content in kidney was also assayed. The levels of tumor necrosis factor-alpha (TNF-α), interleukin-1beta (IL-1β), interleukin-6 (IL-6), cyclooxygenase-2 (COX-2), the extracellular-receptor kinases (ERK1/2), the c-Jun N-terminal kinases (JNK1/2), p38 MAPK and nuclear factor-κB (NF-κB) were measured. Results: Quercetin significantly prevented Pb-induced nephrotoxicity in a dose-dependent manner, indicated by both diagnostic indicators and histopathological analysis. Quercetin significantly decreased Pb content in kidney. Pb-induced profound elevations of oxidative stress in kidney were suppressed by quercetin. Furthermore, quercetin significantly inhibited Pb-induced inflammation in rat kidney. Conclusions: These results suggest that quercetin has the nephroprotective actions. The inhibition of Pb-induced kidney inflammation by quercetin is due at least in part to its anti-oxidant activity and its ability to modulate the MAPK and NF-κB signaling pathway. General significance: Quercetin might be a potent nephroprotective drug to protect Pb-induced kidney injury. © 2012 Elsevier B.V.

Han X.,Jiangsu University | Wang Y.,Tianjin University | Zhu L.,Tianjin University
Energy Conversion and Management | Year: 2013

Direct liquid-immersion cooling of concentrator solar cells was proposed as a solution for receiver thermal management of concentrating photovoltaic (CPV) systems. This research investigates the performance and long-term stability of silicon CPV solar cells operated in De-ionized (DI) water, isopropyl alcohol (IPA), dimethyl silicon oil, and ethyl acetate, respectively. Current-voltage characteristics of silicon CPV solar cells are measured. The presence of a thin liquid layer (1.5 mm) results in an increase in the silicon CPV solar cells efficiency by 8.5-15.2% from the reference value. With an increase of the liquid layer thickness above the cell surface up to 9 mm, due to more incident light is absorbed by the thicker liquid layer, the degree of the improvements to the cell efficiency decreases, which also depends to a noticeable degree on the liquid species. Further, more power output from the cells operated in liquids is achieved under higher concentration ratio. The long-term cell performance is discussed through three separate liquid immersion tests. The results from 1.5 mm test demonstrate that degradation of cells performance immersed in IPA and in ethyl acetate mainly occurs by a decrease of Jsc and efficiency during 170 days of test. But the long-term organic liquids immersion test (180 days) without silicone sealant involved gives confidence of the reliable performance of the silicon CPV solar cells operated in liquids except for DI water. Therefore, the observed performance decay of the cells in 1.5 mm test is due to the interaction between the silicone sealant and IPA or ethyl acetate. However, long-term immersion results from 9 mm test (100 days) show that the stable electrical performance of the cell is difficult to be achieved when immersed in DI water, which is consistent with the previous report. © 2012 Elsevier Ltd. All rights reserved.

Lu M.M.,China University of Mining and Technology | Xie K.H.,Zhejiang University | Wang S.Y.,University of Newcastle | Li C.X.,Jiangsu University
International Journal of Geomechanics | Year: 2013

On the basis of the axisymmetric consolidation model, the governing equation and the corresponding solution were developed for the consolidation of a composite foundation with an impervious column by incorporating an arbitrary stress increment. The consolidation behavior was then investigated as part of the parameter analysis for a composite foundation with an impervious column. The results show that the consolidation rate for a composite foundation with an impervious column was slower than that for a composite foundation with a granular column but was more rapid than that for a natural soil foundation. The consolidation rate accelerated with increasing values of the column-soil constrained modulus ratio or the top-to-bottom stress increment ratio and with decreasing values of the loading period or the radius ratio of the influence zone to the column. The column-soil total stress ratio increased with consolidation and approached the value of the columnsoil constrained modulus ratio. © 2012 AmericanSociety of Civil Engineers.

Wang H.,Jiangsu University | Li J.,Dalian University of Technology
Gaodianya Jishu/High Voltage Engineering | Year: 2013

In order to testify the important effect of hydroxyl radicals (·OH) on organic compounds degradation during a pulsed discharge process in aqueous system, by choosing phenol as a target pollutant, the degradation rates of phenol and the energy efficiencies of reaction system were reviewed under different additive collectors when air and O2 were used as bubbling gas, respectively. Under the same experimental conditions, the concentrations of H2O2 produced by pulsed discharge in deionized water were also measured. The experimental results showed that, in the carrier gases of air and O2, the degradation rates of phenol and the energy efficiencies of phenol decreased with the increase of the concentration of addition (both Na2CO3 and n-butanol) during a pulsed discharge process. And the important effect of ·OH on organic compounds degradation in the pulsed discharge plasma system was testified. Furthermore, the measurement results of H2O2 proved the collecting effect of collectors on ·OH.

Yong Y.-C.,Jiangsu University | Yu Y.-Y.,Nanyang Technological University | Zhang X.,South University of Science and Technology of China | Song H.,Nanyang Technological University | Song H.,Tianjin University
Angewandte Chemie - International Edition | Year: 2014

Low extracellular electron transfer performance is often a bottleneck in developing high-performance bioelectrochemical systems. Herein, we show that the self-assembly of graphene oxide and Shewanella oneidensis MR-1 formed an electroactive, reduced-graphene-oxide-hybridized, three-dimensional macroporous biofilm, which enabled highly efficient bidirectional electron transfers between Shewanella and electrodes owing to high biomass incorporation and enhanced direct contact-based extracellular electron transfer. This 3D electroactive biofilm delivered a 25-fold increase in the outward current (oxidation current, electron flux from bacteria to electrodes) and 74-fold increase in the inward current (reduction current, electron flux from electrodes to bacteria) over that of the naturally occurring biofilms. Shocking bacteria! The title biofilm was constructed by the one-step in?situ bioreduction and self-assembly of graphene oxide (GO) with Shewanella oneidensis. The resulting 3D macroporous rGO/bacteria hybrid biofilm gave a 25-fold increase in maximum oxidation current in microbial fuel cells, and a 74-fold increase in reduction current in microbial electrosynthesis over that of the naturally occurring biofilms. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Cuo L.,CAS Institute of Tibetan Plateau Research | Zhang Y.,U.S. National Center for Atmospheric Research | Wang Q.,Climate Data Center | Zhang L.,CAS Institute of Tibetan Plateau Research | And 4 more authors.
Journal of Climate | Year: 2013

Gridded daily precipitation, temperature minima and maxima, and wind speed are generated for the northern Tibetan Plateau (NTP) for 1957-2009 using observations from 81 surface stations. Evaluation reveals reasonable quality and suitability of the gridded data for climate and hydrology analysis. The Mann-Kendall trends of various climate elements of the gridded data show that NTP has in general experienced annually increasing temperature and decreasing wind speed but spatially varied precipitation changes. The northwest (northeast) NTP became dryer (wetter), while there were insignificant changes in precipitation in the south. Snowfall has decreased along high mountain ranges during the wet and warm season. Averaged over the entire NTP, snowfall, temperature minima and maxima, and wind speed experienced statistically significant linear trends at rates of 20.52 mm yr-1 (water equivalent), +0.04°C yr-1, +0.03°C yr-1, and 20.01 m s-1 yr-1, respectively. Correlation between precipitation/wind speed and climate indices characterizing large-scaleweather systems for four subregions inNTP reveals that changes in precipitation and wind speed in winter can be attributed to changes in the North Atlantic Oscillation (NAO), the Arctic Oscillation (AO), the East Asian westerly jet (WJ), and the El Niño-Southern Oscillation (ENSO) (wind speed only). In summer, the changes in precipitation and wind are only weakly related to these indices. It is speculated that in addition to the NAO,AO, ENSO,WJ, and the East and SouthAsian summermonsoons, local weather systems also play important roles. © 2013 American Meteorological Society.

Zhao W.-W.,Jiangsu University | Wang J.,Jiangsu University | Zhu Y.-C.,Jiangsu University | Xu J.-J.,Jiangsu University | And 2 more authors.
Analytical Chemistry | Year: 2015

In this Feature, electrochemiluminescent (ECL) and photoelectrochemical (PEC) properties and mechanisms of semiconductor quantum dots (QDs) are reviewed, with emphasis on their specific fundamentals and concise comparison on their similarities and differences. With recent illustrative examples of bioanalytical applications, the main signaling strategies for QDs-based ECL and PEC bioanalysis are then highlighted. The future prospects in this field are also discussed. © 2015 American Chemical Society.

Qiao F.,Jiangsu University | Sang Y.-C.,Dalian University of Technology
Vacuum | Year: 2014

Densely packed and highly ordered CdSe quantum dots (QDs) arrays were prepared through a slow evaporation route; to study the photo-generated charges property of ordered CdSe QDs arrays, illumination induced charge separation in the CdSe QDs arrays were investigated through surface photovoltage (SPV) technology based on lock in amplifier. The significantly enhanced SPV signal of CdSe QDs arrays after post-annealing treatment could be attributed to the greatly increased escape of holes from CdSe QDs surface, as well as the decreased the inter nanocrystal distance. Moreover, much faster excess holes dominates in the frequency range of 30 Hz and 200 Hz, which results in the positive charging of the CdSe QDs arrays near the surface. Our results give a guide for its practical photoelectric applications based on nanocrystals. © 2013 Elsevier Ltd. All rights reserved.

Jiangsu University, Slovak University of Technology in Bratislava, Wang, Gu, Cui and Tong | Date: 2013-12-04

A large-size floating state manufacturing method for marine engineering equipment comprises: using a submersible long working platform (5) as a floating platform for constructing marine engineering equipment, each section of a bottom layer block (1) being carried and integrated on the working platform; submerging the submersible long working platform (5) after the bottom layer block (1) is constructed, so as to use the buoyancy of water to make the bottom layer block (1) be separated from the working platform (5) and go into the water; and then, using the bottom layer block (1) as the floating platform, and constructing a main hull (2, 3) and a deck (4) of the marine engineering platform and performing outfitting thereon. In the method, manufacturing is performed in sections in allowance-free sectional construction manner on the floating working platform, and then superposition is performed layer by layer; in the manufacturing process, dynamic measurement and anti-deformation control technologies are adopted, so as to ensure quality and precision of floating state manufacturing, and finally realize construction of large-scale marine engineering equipment.

Xiaobo Z.,Jiangsu University | Jiewen Z.,Jiangsu University | Povey M.J.W.,University of Leeds | Holmes M.,University of Leeds | Hanpin M.,Jiangsu University
Analytica Chimica Acta | Year: 2010

Near-infrared (NIR) spectroscopy has increasingly been adopted as an analytical tool in various fields, such as the petrochemical, pharmaceutical, environmental, clinical, agricultural, food and biomedical sectors during the past 15 years. A NIR spectrum of a sample is typically measured by modern scanning instruments at hundreds of equally spaced wavelengths. The large number of spectral variables in most data sets encountered in NIR spectral chemometrics often renders the prediction of a dependent variable unreliable. Recently, considerable effort has been directed towards developing and evaluating different procedures that objectively identify variables which contribute useful information and/or eliminate variables containing mostly noise. This review focuses on the variable selection methods in NIR spectroscopy. Selection methods include some classical approaches, such as manual approach (knowledge based selection), " Univariate" and " Sequential" selection methods; sophisticated methods such as successive projections algorithm (SPA) and uninformative variable elimination (UVE), elaborate search-based strategies such as simulated annealing (SA), artificial neural networks (ANN) and genetic algorithms (GAs) and interval base algorithms such as interval partial least squares (iPLS), windows PLS and iterative PLS. Wavelength selection with B-spline, Kalman filtering, Fisher's weights and Bayesian are also mentioned. Finally, the websites of some variable selection software and toolboxes for non-commercial use are given. © 2010 Elsevier B.V.

Zhang Y.,Jiangsu University | Zhang Y.,Jiangsu University of Science and Technology | Zu F.,Jiangsu University | Lee S.-T.,Jiangsu University | And 3 more authors.
Advanced Energy Materials | Year: 2014

A record power conversion efficiency of 12.2% is achieved for a hybrid organic-inorganic Schottky solar cell using a simple and low temperature (<150 °C) process. The heterojunction diode based on a simple integration of organic thin layers and silicon promises a low cost way to fabricate high performance solar cells. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Yan X.,Zhejiang University | Yan X.,University of Utah | Li S.,University of Utah | Li S.,Hangzhou Normal University | And 10 more authors.
Journal of the American Chemical Society | Year: 2013

Metallacyclic cores provide a scaffold upon which pendant functionalities can be organized to direct the formation of dimensionally controllable nanostructures. Because of the modularity of coordination-driven self-assembly, the properties of a given supramolecular core can be readily tuned, which has a significant effect on the resulting nanostructured material. Herein we report the efficient preparation of two amphiphilic rhomboids that can subsequently order into 0D micelles, 1D nanofibers, or 2D nanoribbons. This structural diversity is enforced by three parameters: the nature of the hydrophilic moieties decorating the parent rhomboids, the concentration of precursors during self-assembly, and the reaction duration. These nanoscopic constructs further interact to generate metallohydrogels at high concentrations, driven by intermolecular hydrophobic and π-π interactions, demonstrating the utility of coordination-driven self-assembly as a first-order structural element for the hierarchical design of functional soft materials. © 2013 American Chemical Society.

Zheng Y.-W.,Yokohama City University | Nie Y.-Z.,Yokohama City University | Nie Y.-Z.,Jiangsu University | Taniguchi H.,Yokohama City University
World Journal of Gastroenterology | Year: 2013

Hepatocellular carcinoma (HCC) is one of the most common cancers, and is also the leading cause of death worldwide. Studies have shown that cellular reprogram-ming contributes to chemotherapy and/or radiotherapy resistance and the recurrence of cancers. In this article, we summarize and discuss the latest findings in the area of cellular reprogramming in HCC. The aberrant expression of transcription factors OCT4, KLF4, SOX2, c-MYC, NANOG, and LIN28 have been also observed, and the expression of these transcription factors is associated with unfavorable clinical outcomes in HCC. Studies indicate that cellular reprogramming may play a critical role in the occurrence and recurrence of HCC. Recent reports have shown that DNA methylation, miR-NAs, tumor microenvironment, and signaling pathways can induce the expression of stemness transcription factors, which leads to cellular reprogramming in HCC. Furthermore, studies indicate that therapies based on cellular reprogramming could revolutionize HCC treatment. Finally, a novel therapeutic concept is discussed: reprogramming control therapy. A potential reprogram-ming control therapy method could be developed based on the reprogramming demonstrated in HCC studies and applied at two opposing levels: differentiation and reprogramming. Our increasing understanding and control of cellular programming should facilitate the exploitation of this novel therapeutic concept and its application in clinical HCC treatment, which may represent a promising strategy in the future that is not restricted to liver cancer. © 2013 Baishideng Publishing Group Co., Limited. All rights reserved.

Pan C.,Jiangsu University | Chen L.,Jiangsu University | Huang C.,Jiangsu University | Xie M.,Guangxi University
International Journal of Electrical Power and Energy Systems | Year: 2013

Due to increasing concerns on environmental pollution and depleting fossil fuels, electric vehicles have recently been gaining increasing worldwide interest as a promising potential long-term solution to sustainable personal mobility. However, an energy storage system composed of battery and ultra capacitor can display a preferable performance for vehicle propulsion. As the ultra capacitor can fulfill the transient power demand fluctuations, the battery can be downsized to fit the average power demand without facing peak loads. Besides, braking energy can be recovered by the ultra capacitor. This study focuses on a vehicular system powered by two energy storage devices: battery and ultra capacitor. However, energy management strategy is necessary to split the power demand of a vehicle in a suitable way in order to maximize the performance while promoting the fuel economy and endurance of dual energy storage system components. In this paper, a dual energy storage system composed of ultra capacitor and the battery is introduced, the desire discharge current of the vehicular system under urban driving schedules is analyzed, and the working conditions of vehicular system are divided into four modes according to the state of energy storage system, a new hysteresis current control strategy is proposed for the developed vehicular system. The mathematical and electrical models of the vehicular system are developed in detail and simulated using MATLAB and Simulink environments. © 2012 Elsevier Ltd. All rights reserved.

He Z.,Jiangsu University | Zhong W.,Jiangsu University | Wang Q.,Jiangsu University | Jiang Z.,Jiangsu University | Fu Y.,Shanghai Synchrotron Radiation Facility
Applied Thermal Engineering | Year: 2013

In diesel engines, the cavitating flow in nozzles greatly affects the fuel atomization characteristics and then the subsequent combustion and exhaust emissions. In this paper, with the needle lift curve on the basis of injection rate experimental data, a moving mesh generation strategy was applied for 3D simulation of the nozzle cavitating flow. Based on the third-generation synchrotrons of Shanghai Synchrotron Radiation facility (SSRF), a high-precision three-dimension structure of testing nozzle with detailed internal geometry information was obtained using X-ray radiography for a more accurate simulation. A flow visualization experiment system with a transparent scaled-up vertical multi-hole injector nozzle tip was setup. The experimental data was obtained to make a comparison to validate the calculated results and good qualitative agreement was shown between them. Afterward, the effects of needle movement on development of the cavitating flow and flow characteristics parameters were investigated. Finally, the influence of fuel temperature on development of the cavitating flow was also studied. Research of the flow characteristics for the diesel and biodiesel revealed that the flow characteristics of the biodiesel with a temperature rise of between 50 K and 60 K in injector nozzles will be similar to those of the diesel fuel. © 2013 Elsevier Ltd. All rights reserved.

Zhang C.,Jiangsu University | Zhang C.,CAS Shanghai Institute of Optics and fine Mechanics | Yao J.,CAS Shanghai Institute of Optics and fine Mechanics | Ni J.,CAS Shanghai Institute of Optics and fine Mechanics
Optics Express | Year: 2012

We theoretically investigate the X-ray supercontinuum generated by interaction of multi-cycle, chirped polarization gating pulses with the helium gas. It is shown that with this scheme, an isolated sub-50-attosecond pulse can be obtained straightforwardly without any phase compensation. Interestingly, if one selects an extremely broad spectral range near the highorder harmonic cutoff, an isolated and intense sub-24-attosecond pulse can be generated after phase compensation, which could be used to detect and control the electronic dynamics inside the atoms. Furthermore, it is found that the generation of such a broad and smooth X-ray supercontinuum is not so stringent on the selection of the simulated parameters, allowing for the experimental demonstration of this technique in the future. © 2012 Optical Society of America.

Zhao T.,Fudan University | Wang Y.,Fudan University | Wang Y.,Jiangsu University | Chen H.,Jiangsu University | Shen D.,Fudan University
Applied Physics B: Lasers and Optics | Year: 2014

We report on the first graphene passively Q-switched Ho:YAG ceramic laser with central wavelength of 2,097 nm. Stable pulses of 28-64 kHz repetition rate and 2.6-9 μs pulse widths were generated under 1,907 nm thulium fiber laser pumping. Maximum average power of 264 mW with 9.3 μJ pulse energy was obtained under 3.27 W of pump power. © 2014 Springer-Verlag Berlin Heidelberg.

Sha J.J.,Fudan University | Shen D.Y.,Fudan University | Zhao T.,Jiangsu University | Yang X.F.,Jiangsu University
Laser Physics Letters | Year: 2013

We report on highly efficient operation of a Tm:YAG laser resonantly pumped (3H6→3F4) by an Er:YAG ceramic laser at 1617 nm. The lasing characteristics of 6 at.% Tm3+-doped Tm:YAG crystal were evaluated using output couplers of 6%, 10% and 20% transmission. A maximum continuous wave (cw) output power of 5.6 W at 2015 nm was obtained with a 10% transmission output coupler under 10.6 W of pump power, corresponding to a slope efficiency of 60.4% with respect to incident pump power. © 2013 Astro Ltd.

Li X.,Suqian College | Wang S.,Jiangsu University
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2012

TiC-reinforced Ni 3Al composites were fabricated through thermal explosion reaction. The thermal explosion reaction process of Ti-C-3Ni-Al system and the composites were analyzed by differential scanning calorimetric(DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the reaction of titanium and carbon was ignited by the reaction of nickel and aluminum. Pure TiC/Ni 3Al products were synthesized by the thermal explosion. The reaction temperature of Ti-C-3Ni-Al system was independent of TiC contents. The system composition and thermal explosion temperature were found to have obvious influences on the morphology of the composites. With the increase of TiC contents, TiC particulates became coarser and the micro pores of the products decreased. The relative density of the products increased at first and then decreased with the rise of the thermal explosion temperature and TiC contents. The microhardness of the composite was revealed to be higher with higher TiC content.

Zhang Y.,Jiangsu University | Chen M.-B.,Jiangsu University | Zhou X.-Y.,Fudan University | Hong X.-N.,Fudan University
PLoS ONE | Year: 2013

Background:Non-Hodgkin's lymphoma (NHL) has been widely reported to be associated with autoimmune and pro-inflammatory response, and genetic polymorphisms of candidate genes involved in autoimmune and pro-inflammatory response may influence the survival and prognosis of NHL patients. To evaluate the role of such genetic variations in prognosis of NHL, we conducted this study in a Chinese population.Methods:We used the TaqMan assay to genotype six single nucleotide polymorphisms (SNPs) (TNF rs1799964T>C, LTA rs1800683G>A, IL-10 rs1800872T>G, LEP rs2167270G>A, LEPR rs1327118C>G, TNFAIP8 rs1045241C>T) for 215 NHL cases. Kaplan-Meier analysis was performed to compare progression free survival among two common genotypes. Cox proportional hazard models were used to identify independent risk factors.Results:We observed that LTA rs1800683G>A was significantly associated with risk of progression or relapse in NHL patients (HR = 1.63, 95%CI = 1.06-2.51; P = 0.028), particularly in Diffuse large B cell lymphoma (DLBCL) cases (HR = 1.50, 95%CI = 1.10-2.04, P = 0.01). Both univariate and multivariate Cox regression analysis showed that in DLBCL patients, Ann Arbor stage III/IV, elevated LDH level before treatment and LTA rs1800683 AA genotype carrier were independent risk factors for progression or relapse. While in NK/T cell lymphoma, Ann Arbor stage III/IV and elevated β2-MG level before treatment indicated poorer prognosis.Conclusions:The polymorphism of LTA rs1800683G>A contributes to NHL prognosis in a Chinese population. Further large-scale and well-designed studies are needed to confirm these results. © 2013 Zhang et al.

Zhang C.,Jiangsu University | Zhang C.,CAS Shanghai Institute of Optics and fine Mechanics | Liu C.,CAS Shanghai Institute of Optics and fine Mechanics | Xu Z.,CAS Shanghai Institute of Optics and fine Mechanics
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

The propagation of a spatially inhomogeneous few-cycle laser field, linked to surface plasmon polaritons, through an ensemble of quantum wells is investigated under two conditions. It is found that the transmitted spectra sensitively depend on the spatial inhomogeneity due to the nonlinear propagation effects. Under the small-frequency mismatch condition, the transmitted spectral distribution is continuous for the spatially homogeneous case. However, when spatial inhomogeneity is introduced, the distribution is discrete instead, with clearly even- and odd-order harmonic peaks coexisting, which is related to the strong-field reshaping effect and the inversion symmetry breaking due to the introduction of the spatially inhomogeneous field. As for the large-frequency mismatch condition, only odd-order harmonics exist, no matter how strong the spatial inhomogeneity is. Under both conditions, the propagation effect can obviously enhance the intensity of higher spectral components. © 2013 American Physical Society.

Zhu X.,Jiangsu University | Zhang C.,Jiangsu University | Zhang C.,CAS Shanghai Institute of Optics and fine Mechanics | Gu M.,Jiangsu University | Yao J.,CAS Shanghai Institute of Optics and fine Mechanics
Optics Express | Year: 2014

We theoretically investigate high-order harmonic generation (HHG) from aligned N2 molecules with a driving field composed of twocolor circularly polarized laser pulses. It is shown that the combination of N 2 molecules and the waveform-controlled laser field allows us to select either long or short quantum path, depending on molecular alignment angles, while in atom Ar, two paths show comparable contribution to HHG. The selection of single quantum path in aligned N2 molecules leads to an ultrabroad and smooth XUV supercontinuum, giving rise to isolated attosecond pulses generation. Moreover, we can control the intensity ratio of two attosecond pulses by adjusting the molecular alignment angles, providing an opportunity for attosecond pump-probe technique. © 2014 Optical Society of America.

Lu X.,Jiangsu University | Lu J.,First Peoples Hospital of Changzhou
Clinical Laboratory | Year: 2015

Background: Colorectal cancer (CRC) is a severe disease with considerable morbidity and mortality. Stable presence of miRNAs in serum enables them to be biomarkers for early diagnosis and surveillance of the progress of CRC. Methods: The blood samples of S3 CRC patients of I-IV stage pre therapy and 50 controlled healthy people were collected and total serum RNA was extracted. The level of miR-423-5p and miR-484 in serum were detected by qPCR. Results: In stage I - II CRC, serum miR-423-5p was significantly elevated compared with the control, whereas miR-484 was attenuated. In stage III - IV, no significance difference in miR-423-5p level was found between CRC patients and the control, and miR-484 level increased dramatically. Conclusions: The study provides the possibility that the detection of miR-484-5p and miR-484 may be a useful method for early diagnosis and surveillance of the progress of CRC.

Xin X.-L.,Jiangsu University | Chen M.,Fudan University | Ai Y.-B.,Jiangsu University | Yang F.-L.,Jiangsu University | And 2 more authors.
Inorganic Chemistry | Year: 2014

Phosphorescent binuclear copper(I) complexes [Cu2(BrphenBr) 2(Ph2P(CH2)nPPh2) 2](ClO4)2 with different conformations are obtained by reaction of [Cu(NCCH3)4]ClO4, 3,8-dibromo-1,10-phenanthroline (BrphenBr), and corresponding diphosphine ligands, where n = 1, 4, 5, and 6 in complexes Cu-1, Cu-2, Cu-3, and Cu-4, respectively. Complex Cu-4 exhibits both the eclipsed and the staggered conformations of 18-membered Cu2C12P4 metallacycles in a 1:1 ratio in the crystal structure. All complexes are very stable to air and moisture in the solid state because of the high level of protection of all the Cu(I) centers, N and P atom centers resulting from the close contact of BrphenBr and diphosphine ligands, and what is more important is that there exist very soft P donors and the chelating effect of aromatic N atoms. The ESI-MS result through changing the collision cell energy from 0 to 20 eV suggests that the corresponding [Cu2(Ph2P(CH 2)nPPh2)2]2+ cations are the thermodynamically stable species, while [Cu2(BrphenBr) 2(Ph2P(CH2)nPPh2) 2](ClO4)2 are stable products in crystallization kinetics in solutions. All complexes Cu-1-Cu-4 display good aggregation-induced phosphorescence emission (AIPE) behavior in CH 2Cl2/hexane mixed solvents, which are suggested to arise from restriction of intramolecular rotation. Aggregation-induced emission (AIE) of complexes Cu-1-Cu-4 in PBS/DMSO (99:1, v:v) is used for living HeLa cell imaging successfully with green intracellular emission image. © 2014 American Chemical Society.

Xue D.Q.,Suzhou University | Qian C.,Jiangsu University | Yang L.,Suzhou University | Wang X.F.,Suzhou University
European Journal of Surgical Oncology | Year: 2012

Background: Breast surgical site infections (SSIs) are major sources of postoperative morbidity and mortality, and it's established that surveillance of risk factors is effective in reducing hospital-acquired infections. However, studies about risk factors for breast SSIs were still under controversy because of limited data, contradictory results and lack of uniformity. Materials and methods: We searched the electronic database of PubMed for case-control studies about risk factors for breast SSIs, and a meta-analysis was conducted. Results: Eight studies including 681 cases and 2064 controls were eligible, and data was combined if the risk factor was studied by at least two studies. Of the 20 possible risk factors involved, 14 were proved significant for SSIs as follows: increased age, hypertension, higher body mass index (BMI), diabetes mellitus, American society of anesthesiologists (ASA) 3 or 4, previous breast biopsy or operation, preoperative chemoradiation, conservation therapy versus other surgical approaches, hematoma, seroma, more intraoperative bleeding, postoperative drain, longer drainage time and second drainage tube placed. However, other factors like smoking habit, immediate reconstruction, axillary lymph node dissection, preoperative chemotherapy, corticosteroid usage and prophylactic antibiotic didn't show statistical significance. Conclusions: This meta-analysis provided a list of predictable or preventable factors that could be taken measures to reduce the rate of breast SSIs and excluded some negligible factors. This could be useful for developing effective prevention and treatment policies for patients with SSIs and improving the overall quality of life. © 2012 Elsevier Ltd. All rights reserved.

Ma X.,Jiangsu University | Li Q.,Suqian College | Shen Y.,Jiangsu University
Acta Geographica Sinica | Year: 2012

Based on the SPOT satellite images of Jiangsu Province in 2007/2008, using models such as exploratory spatial data analysis and spatial metrics, the paper conducts a quantitative analysis of the space differentiation of rural settlements in Jiangsu Province, and further identifies the regional types. The results are shown as follows. In spatial distribution, the rural settlements in Jiangsu are characterized by obvious concentration with evident spatial variability, which is shown in the ladder-like sparse distribution towards the north and south in areas along the Yangtze River with high correlation in the overall distribution and geomorphic types. In the scale, the rural settlements in Jiangsu are generally in small scale with small difference in the scale of small villages and large gap in the scale of large villages which account for a small proportion. The rural settlements in Jiangsu are characterized by low concentration in size distribution, and is obviously presented in the "dumbbell" structure, namely, the rural settlements in northern and southern Jiangsu are in a large scale, and those in the central part are in a relatively small scale. In the spatial change of form and pattern, through the measurement of the pattern indices of the five transects in the northern, central and southern Jiangsu, the coastal area and areas along the Grand Canal, it was found that the form of the rural settlements in central Jiangsu is more complex than that in the northern and southern parts of the province, and the form of coastal area is more complex than that in areas along the canal. The rural settlements in southern Jiangsu and areas along the canal are characterized by good connectivity. The rural settlements in the five transects are significantly differentiated in distribution. Finally, through establishing the morphological measurement index system of the rural settlements, by adopting the method of hierarchical cluster, the rural settlements in Jiangsu are divided into eight types: Xulian hillock (low-density large-mass type), Suhuai plain (medium-density broad-band type), coastal reclamation area (high-density stripe type), polder area in central Suzhou (medium-density arc-belt type), plain south of the Yangtze River (medium-density small-mass type), lake mound land (low-density point-scattered type), Ningyi hilly region (cluster-like dispersal type), and Lixiahe area (low-density cluster-like type).

Chen W.,Fudan University | Shen D.,Fudan University | Zhao T.,Jiangsu University | Yang X.,Jiangsu University
Optics Express | Year: 2012

We report on high-power operation of a cladding-pumped Er,Yb -doped broadband superfluorescent fiber source in the 1.55 μm spectral region. Over 16 W of single-ended amplified spontaneous emission output was generated employing a simple, all-fiber geometry without the use of a high reflectivity mirror or seed source. The wavelength range spanned from ̃1531 nm to 1568.5 nm with a bandwidth (FWHM) of ̃17 nm and the corresponding slope efficiency with respect to launched pump power at 975 nm was 30.7%. © 2012 Optical Society of America.

Zhang Z.,University of Mississippi Medical Center | Zhu Z.,Shandong University | Watabe K.,University of Mississippi Medical Center | Zhang X.,University of Mississippi Medical Center | And 4 more authors.
Cell Death and Differentiation | Year: 2013

In addition to protein-coding genes, the human genome makes a large amount of noncoding RNAs, including microRNAs and long noncoding RNAs (lncRNAs). Both microRNAs and lncRNAs have been shown to have a critical role in the regulation of cellular processes such as cell growth and apoptosis, as well as cancer progression and metastasis. Although it is well known that microRNAs can target a large number of protein-coding genes, little is known whether microRNAs can also target lncRNAs. In the present study, we determine whether miR-21 can regulate lncRNA expression. Using the lncRNA RT-PCR (reverse transcription-polymerase chain reaction) array carrying 83 human disease-related lncRNAs, we show that miR-21 is capable of suppressing the lncRNA growth arrest-specific 5 (GAS5). This negative correlation between miR-21 and GAS5 is also seen in breast tumor specimens. Of interest, GAS5 can also repress miR-21 expression. Whereas ectopic expression of GAS5 suppresses, GAS5-siRNA increases miR-21 expression. Importantly, there is a putative miR-21-binding site in exon 4 of GAS5; deletion of the miR-21-binding site abolishes this activity. Experiments with in vitro cell culture and xenograft mouse model suggest that GAS5 functions as a tumor suppressor. We further show that the biotin-labeled GAS5-RNA probe is able to pull down the key component (AGO2) of the RNA-induced silencing complex (RISC) and we subsequently identify miR-21 in this GAS5-RISC complex, implying that miR-21 and GAS5 may regulate each other in a way similar to the microRNA-mediated silencing of target mRNAs. Together, these results suggest that miR-21 targets not only tumor-suppressive protein-coding genes but also lncRNA GAS5. © 2013 Macmillan Publishers Limited. All rights reserved.

Dai J.,Jiangsu University | Xu X.,Nanjing University of Science and Technology | Zhao D.,Jiangsu University
IEEE Antennas and Wireless Propagation Letters | Year: 2013

Sparse representation direction-of-arrival (DOA) estimation methods exhibit many advantages over other DOA estimation methods. However, they suffer from a high computational complexity. This letter describes a real-valued sparse representation method through utilizing a unitary transformation that can convert complex-valued manifold matrices of uniform linear arrays (ULAs) into real ones. Due to this transformation, the computational complexity is decreased by a factor of at least four. The letter also shows that the proposed method has a better noise suppression because of exploiting an additional real structure. Therefore, it outperforms the original method, especially when signal-to-noise ratio (SNR) is low. Simulation results verify the performance improvement of the proposed method. © 2002-2011 IEEE.

Bai S.,Jiangsu University | Shen X.,Jiangsu University | Zhu G.,Jiangsu University | Yuan A.,Jiangsu University of Science and Technology | And 3 more authors.
Carbon | Year: 2013

Reduced graphene oxide (RGO) with different amounts of wrinkling were synthesized in a water-ethylene glycol (EG) system with different volume ratios. The obtained RGO were characterized by X-ray powder diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, thermogravimetric analyze, and Brunauer-Emmett-Teller N2 adsorption-desorption analysis. It was found that the degree of wrinkling decreased with an increase in the EG/water volume ratio. A possible mechanism for the formation of wrinkles was proposed. The adsorptive and catalytic properties of the RGO were investigated. Bare RGO were used to adsorb dyes as well as catalyze the reduction of 4-nitrophenol. The results revealed that neither the most wrinkled nor the smoothest RGO was best for the adsorptive and catalytic applications, while an intermediate state showed the best performance. A relationship between morphology, and the adsorptive and catalytic performance was discussed. © 2013 Elsevier Ltd. All rights reserved.

Wang A.,Nanjing University of Science and Technology | Long L.,Jiangsu University | Zhang C.,Nanjing University of Science and Technology
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2011

Phthalocyanines (Pcs) can very well satisfy the different demands of photosensitizer in photodynamic therapy (PDT) such as absorption, amphiphilicity and most importantly, high photochemical reactivity, depending on the subtle interplay of structure-function relationships. They have been shown to be phototoxic against a number of tumor cells. Certain criteria of ideal photosensitizers for PDT were described. A brief summary of the synthesis and some properties of photo-activable Pcs have been presented and an outlook for future photocytotoxic Pcs given. These Pcs are classified into three groups: (1) Pcs with different peripheral and/or non-peripheral substitution; (2) Pcs with different axial substitution; (3) Pcs with different metal center. © 2011 Springer Science+Business Media B.V.

Tian F.,University of Shanghai for Science and Technology | Huang Z.P.,Jiangsu University | Whitmore L.,Christian Doppler Laboratory
Physical Chemistry Chemical Physics | Year: 2012

Poly- and single-crystalline Ni nanowire arrays showing ultrahigh axial squareness are fabricated by direct-current electrodeposition in pores of anodic aluminum oxide templates. High voltage is shown to be the key in order for Ni nanowires to have a (220) preferred orientation. 2-Dimensional nucleation theory is used to understand the growth of the nanowires. Based on the structure and growth analyses, the magnetic properties of different kinds of nanowires are explained. This journal is © the Owner Societies 2012.

Wu D.,Nanjing University | Wu D.,Jiangsu University | Jiang S.,Jiangsu University | Liu X.,Nanjing University
Journal of Physical Chemistry C | Year: 2011

The plasmon coupling in a three-layered Au/SiO2/Ag nanoshell has been investigated by means of Mie scattering theory. The dipole-dipole and dipole-quadrupole Fano resonances have been observed in the extinction spectra of Au/SiO2/Ag nanoshells. With increase of the thickness of the middle layer, the dipole-dipole Fano resonance shows a blue shift and the magnitude of this Fano profile enhances while the dipole-quadrupole Fano resonance shows a red shift and reduces. With increase of the thickness of the outer shell, the dipole-dipole Fano minimum shows a blue shift and its magnitude decreases while both the energy and magnitude of dipole-quadrupole Fano resonance increase. All of the behaviors have been discussed with the plasmon hybridization model. In addition, the Au/SiO2/Ag nanoshell is found to show strong near-field enhancements in several regions, especially in the infrared region, which may provide effective applications in surface enhanced spectroscopy. © 2011 American Chemical Society.

Stephenson J.D.,University of Cambridge | Stephenson J.D.,University of Hawaii at Manoa | Li H.,University of Cambridge | Li H.,Jiangsu University | And 4 more authors.
Structure | Year: 2013

HIV-1 genomic RNA has a noncoding 5′ region containing sequential conserved structural motifs that control many parts of the life cycle. Very limited data exist on their three-dimensional (3D) conformation and, hence, how they work structurally. To assemble a working model, we experimentally reassessed secondary structure elements of a 240-nt region and used single-molecule distances, derived from fluorescence resonance energy transfer, between defined locations in these elements as restraints to drive folding of the secondary structure into a 3D model with an estimated resolution below 10 Å. The folded 3D model satisfying the data is consensual with short nuclear-magnetic-resonance-solved regions and reveals previously unpredicted motifs, offering insight into earlier functional assays. It is a 3D representation of this entire region, with implications for RNA dimerization and protein binding during regulatory steps. The structural information of this highly conserved region of the virus has the potential to reveal promising therapeutic targets. © 2013 Elsevier Ltd. All rights reserved.

Xia J.,Jiangsu University | Xia J.,Liaocheng University | Sun C.,Jiangsu University | Zhang B.,Nanjing University of Science and Technology
Journal of the Franklin Institute | Year: 2012

This paper considers the problems of robust stochastic stabilization and robust H ∞ controller design for a class of stochastic Markovain jumping systems with mixed time delays and polytopic parameter uncertainties. Both the interval time-varying delay and distributed time delay are simultaneously considered. Some new delay-dependent sufficient conditions, which differs greatly from the most existing results, are obtained based on the decoupling method and some advanced techniques. A numerical example is provided to illustrate the effectiveness of the proposed criteria. © 2011 The Franklin Institute.

Lovasz L.M.,University of Cambridge | Thomassen C.,Technical University of Denmark | Thomassen C.,King Abdulaziz University | Wu Y.,Jiangsu University | And 2 more authors.
Journal of Combinatorial Theory. Series B | Year: 2013

The main theorem of this paper provides partial results on some major open problems in graph theory, such as Tutte's 3-flow conjecture (from the 1970s) that every 4-edge connected graph admits a nowhere-zero 3-flow, the conjecture of Jaeger, Linial, Payan and Tarsi (1992) that every 5-edge-connected graph is Z3-connected, Jaeger's circular flow conjecture (1984) that for every odd natural number k≥3, every (2k-2)-edge-connected graph has a modulo k-orientation, etc. It was proved recently by Thomassen that, for every odd number k≥3, every (2k2+k)-edge-connected graph G has a modulo k-orientation; and every 8-edge-connected graph G is Z3-connected and admits therefore a nowhere-zero 3-flow. In the present paper, Thomassen's method is refined to prove the following: For every odd number k≥3, every (3k-3)-edge-connected graph has a modulo k-orientation. As a special case of the main result, every 6-edge-connected graph is Z3-connected and admits therefore a nowhere-zero 3-flow. Note that it was proved by Kochol (2001) that it suffices to prove the 3-flow conjecture for 5-edge-connected graphs. © 2013 Elsevier Inc.

Han F.,Jiangsu University | Yao H.-F.,Jiangsu University | Ling Q.-H.,Jiangsu University of Science and Technology
Neurocomputing | Year: 2013

Recently Extreme Learning Machine (ELM) for single-hidden-layer feedforward neural networks (SLFN) has been attracting attentions for its faster learning speed and better generalization performance than those of traditional gradient-based learning algorithms. However, ELM may need high number of hidden neurons and lead to ill-condition problem due to the random determination of the input weights and hidden biases. In this paper, a hybrid learning algorithm is proposed to overcome the drawbacks of ELM, which uses an improved particle swarm optimization (PSO) algorithm to select the input weights and hidden biases and Moore-Penrose (MP) generalized inverse to analytically determine the output weights. In order to obtain optimal SLFN, the improved PSO optimizes the input weights and hidden biases according to not only the root mean squared error (RMSE) on validation set but also the norm of the output weights. The proposed algorithm has better generalization performance than traditional ELM and other evolutionary ELMs, and the conditioning of the SLFN trained by the proposed algorithm is also improved. Experiment results have verified the efficiency and effectiveness of the proposed method. © 2012 Elsevier B.V.

Shen X.,Jiangsu University | Wu J.,Jiangsu University | Bai S.,Jiangsu University | Zhou H.,Jiangsu University of Science and Technology
Journal of Alloys and Compounds | Year: 2010

In this study, graphene-based magnetic nanocomposites (graphene/Fe 3O4 and graphene oxide/Fe3O4) have been prepared via a facile and effective one-pot solvothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and ultraviolet-visible (UV-vis) spectroscopy were used to demonstrate the successful attachment of Fe3O4 nanoparticles to graphene and graphene oxide sheets. It is shown that the Fe3O4 nanoparticles with a size of ca. 60 nm were well spread out on the graphene and graphene oxide sheets, respectively. The thermal stability of the nanocomposites was investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC) analyses. Magnetic studies reveal a superparamagnetic behavior of the graphene/Fe3O4 nanocomposites, which make it promising for practical applications in future bio-nanotechnology. © 2010 Elsevier B.V. All rights reserved.

Jiang Z.,Jiangsu University | Wei W.,Jiangsu University | Mao D.,Nanjing University | Chen C.,Jiangsu University | And 3 more authors.
Nanoscale | Year: 2015

Silver-loaded nitrogen-doped yolk-shell mesoporous TiO2 hollow microspheres (Ag-N-TiO2-YSM) were prepared by employing acetic acid as the hollowing controller and triethanolamine as the N source for the first time. Ag nanoparticles (NPs) were uniformly deposited by a simple in situ photo-reduction method, which can prevent the aggregation of Ag NPs. The efficiency of the as-prepared samples was investigated by monitoring the degradation of rhodamine B and ciprofloxacin under visible light irradiation. The experimental results indicate that N-doped yolk-shell mesoporous TiO2 hollow microspheres show higher photocatalytic activity than P25 TiO2 under visible light irradiation because of N doping and the unique yolk-shell structure. In addition, Ag-N-TiO2-YSM shows enhanced activity compared with N-TiO2-YSM due to the SPR absorption of silver NPs and the fast generation, separation and transportation of the photogenerated carriers. Moreover, the Ag contents can affect the photocatalytic activity of the Ag-N-TiO2-YSM composite. A suitable amount of Ag deposition gives the highest photocatalytic activity. A higher loading does not improve the photocatalytic activity of N-TiO2-YSM further. The active species generated in the photocatalytic system were also investigated. Based on our experimental results, a possible photocatalytic mechanism was proposed. The strategy presented here gives a promising route towards the development of delicate metal@hollow semiconductor composites for many applications in photocatalysis. This journal is © The Royal Society of Chemistry.

Huang Z.,Jiangsu University | Chen Z.,Jiangsu University | Lv C.,Jiangsu University | Meng H.,Tongji University | Zhang C.,Jiangsu University
ACS Nano | Year: 2014

The exploitation of a low-cost catalyst is desirable for hydrogen generation from electrolysis or photoelectrolysis. In this study we have demonstrated that nickel phosphide (Ni12P5) nanoparticles have efficient and stable catalytic activity for the hydrogen evolution reaction. The catalytic performance of Ni12P5 nanoparticles is favorably comparable to those of recently reported efficient nonprecious catalysts. The optimal overpotential required for 20 mA/cm 2 current density is 143 ± 3 mV in acidic solution (H 2SO4, 0.5 M). The catalytic activity of Ni 12P5 is likely to be correlated with the charged natures of Ni and P. Ni12P5 nanoparticles were introduced to silicon nanowires, and the power conversion efficiency of the resulting composite is larger than that of silicon nanowires decorated with platinum particles. This result demonstrates the promising application potential of metal phosphide in photoelectrochemical hydrogen generation. © 2014 American Chemical Society.

Zheng S.,Zhejiang University of Finance and Economics | Zheng S.,Jiangsu University
Mathematical Problems in Engineering | Year: 2012

This paper investigates the projective synchronization (PS) of drive-response time-varying coupling complex dynamical networks with time delay via an adaptive-impulsive controlling method, in which the weights of links are time varying. Based on the stability analysis of impulsive control system, sufficient conditions for the PS are derived, and a hybrid controller, that is, an adaptive feedback controller with impulsive control effects, is designed. Numerical simulations are performed to verify the correctness and effectiveness of theoretical result.

Xiang J.,Jiangsu University of Science and Technology | Li J.,Jiangsu University of Science and Technology | Zhang X.,Jiangsu University of Science and Technology | Ye Q.,Jiangsu University of Science and Technology | And 2 more authors.
Journal of Materials Chemistry A | Year: 2014

Carbon nanofibers with ferromagnetic metal nanoparticles (CNF-M, M = Fe, Co, and Ni) have been synthesized by carbonizing electrospun polyacrylonitrile nanofibers including metal acetylacetonate in an argon atmosphere, and their phase composition, microstructure, magnetic properties and electromagnetic (EM)-wave absorbability have been studied. The microstructure analysis shows that the in situ formed metal nanoparticles are well distributed along carbon-based nanofibers and encapsulated by ordered graphite layers. The investigation of magnetic properties and EM-wave absorbability reveals that the as-synthesized CNF-M has typical characteristics of ferromagnetic materials and exhibits excellent EM-wave absorption properties (reflection loss exceeding -20 dB) from the C-band to the Ku-band (4-18 GHz) over an absorber thickness of 1.1-5.0 mm due to the efficient complementarities of complex permeability and permittivity resulting from the magnetic metal nanoparticles and lightweight carbon, as well as the particular particle/graphite core/shell microstructures in CNF-M. Moreover, a minimum reflection loss value of -67.5, -63.1, and -61.0 dB is achieved at 16.6, 12.9, and 13.1 GHz with a matching thickness of 1.3, 1.6, and 1.7 mm for CNF-Fe, CNF-Co, and CNF-Ni, respectively. These magnetic carbon nanofibers are attractive candidates for the new type of high performance EM-wave absorbing materials. This journal is © the Partner Organisations 2014.

Xia J.-P.,Jiangsu University | Sun H.-X.,Jiangsu University | Sun H.-X.,CAS Beijing Institute of Acoustics | Sun H.-X.,Nanjing University
Applied Physics Letters | Year: 2015

We report an exotic acoustic focusing effect through a simple brass circular ring structure immersed in water. The acoustic waves can be focused on a prefect point at the centre of the ring structure. This exotic acoustic focusing phenomenon arises from the intrinsic modes in the ring structure at some special eigenfrequencies, which is essentially distinct from the previous studies originating from the negative refraction. The focusing effect is closely related to the size and shape of the ring structure. Interesting applications of the focusing mechanism in black box detectors in the sea and medical ultrasound treatment are further discussed. © 2015 AIP Publishing LLC.

Zhou H.,Jiangsu University | Yan J.,Jiangsu University | Shen X.,Jiangsu University | Zhou H.,Jiangsu University of Science and Technology | Yuan A.,Jiangsu University of Science and Technology
RSC Advances | Year: 2014

Four cyano-bridged heterobimetallic trinuclear complexes, {[Ni(en) 2][Fe(qcq)(CN)3]2}·2H2O (1) [en = 1,2-ethylenediamine; qcq- = 8-(2-quinoline-2-carboxamido) quinoline anion], {[Ni(teta)][Fe(qcq)(CN)3]2} ·2DMF·2H2O (2) (teta = 5,5,7,12,12,14-hexamethyl-1,4,8, 11-tetraazacyclotetradecane, DMF = N,N-dimethylformamide), {[CuL 1][Fe(qcq)(CN)3]2}·0.61H2O (3) (L1 = 3,10-dibutyl-1,3,5,8,10,12-hexaazacyclotetradecane) and {[CuL2][Fe(qcq)(CN)3]2}·4.75H 2O (4) (L2 = 3,10-dipropyl-1,3,5,8,10,12- hexaazacyclotetradecane) have been synthesized and characterized both structurally and magnetically. The structural analyses reveal that 1-4 are all trinuclear centrosymmetric clusters, and the intercluster π-π interactions and hydrogen bonds extend 1-4 into high dimensional supermolecular networks. Magnetic investigation indicates that 1 and 2 exhibit intracluster ferromagnetic couplings accompanied by significant magnetic anisotropy. In contrast, 3 and 4 show unusual intracluster antiferromagnetic couplings, which could even be decoupled by a strong applied field. © 2014 The Royal Society of Chemistry.

Bai S.,Jiangsu University | Shen X.,Jiangsu University | Zhu G.,Jiangsu University | Li M.,Jiangsu University | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2012

Ni xCo 100x (x = 0, 25, 50, 75, and 100) nanoparticles were uniformly in situ grown on reduced graphene oxide (RGO) nanosheets by a coreduction process for the first time. The as-synthesized products were characterized by X-ray powder diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES), and transmission electron microscopy (TEM). It was found that RGO nanosheets can effectively prevent the aggregation of Ni xCo 100x nanoparticles. The size and morphology of the Ni xCo 100x nanoparticles on RGO nanosheets can be slightly adjusted by changing the Ni:Co atomic ratio. The magnetic properties of the RGO-Ni xCo 100x composites were investigated at 300 and 1.8 K, respectively. The results reveal that the composites have ferromagnetic characteristics and show composition dependent magnetic properties. In addition, these RGO-Ni xCo 100x nanocomposites also exhibit enhanced catalytic activities toward the reduction of 4-nitrophenol (4-NP) by NaBH 4 as compared with bare Ni xCo 100x alloy, and the RGO-Ni 25Co 75 shows the highest catalytic activity among the obtained nanocomposites. This general and facile coreduction route can be extended to synthesize other alloy nanostructures on RGO nanosheets with various morphologies and functions, and provides a new opportunity for the application of graphene-based materials. © 2012 American Chemical Society.

Xu M.,Jiangsu University | Xu M.,University of Houston | Mo Y.-Y.,University of Mississippi Medical Center
Cellular and Molecular Life Sciences | Year: 2012

As master gene regulators, microRNAs are involved in diverse cellular pathways. It is well known that microRNAs are often dysregulated in many types of cancer and other human diseases. In cancer, microRNAs may function as oncogenes or tumor suppressors. Interestingly, recent evidence suggests that microRNA-mediated gene regulation interconnects with the Akt pathway, forming an Akt-microRNA regulatory network. MicroRNAs and Akt in this network work together to exert their cellular functions. Thus, a better understanding of this Akt-microRNA regulatory network is critical to successful targeting of the PI3K/Akt pathway for cancer therapy. We review recent advances in the understanding of how microRNAs affect Akt activity as well as how microRNAs are regulated through the Akt pathway. We also briefly discuss the clinical implication of gene regulation mediated through Akt-associated microRNAs. © 2012 Springer Basel AG.

Gao W.,Yunnan Normal University | Zhu L.,Jiangsu University
Computational Intelligence and Neuroscience | Year: 2014

The gradient learning model has been raising great attention in view of its promising perspectives for applications in statistics, data dimensionality reducing, and other specific fields. In this paper, we raise a new gradient learning model for ontology similarity measuring and ontology mapping in multidividing setting. The sample error in this setting is given by virtue of the hypothesis space and the trick of ontology dividing operator. Finally, two experiments presented on plant and humanoid robotics field verify the efficiency of the new computation model for ontology similarity measure and ontology mapping applications in multidividing setting. © 2014 Wei Gao and Linli Zhu.

Zhang J.,Jiangsu University of Science and Technology | Yan B.,Jiangsu University of Science and Technology | Wan S.,Jiangsu University of Science and Technology | Kong Q.,Jiangsu University
Industrial and Engineering Chemistry Research | Year: 2013

Polyethylene-based waste plastics need hundreds of years to degrade in atmospheric conditions, so innovative upcycling processes are necessary in addition to traditional recycling services. This study presents an environmentally benign and solvent-free autogenic process, in which waste plastics such as waste polyethylene (PE) were converted into Fe 3O4@C core-shell structures with about 800 nm in diameter and tens of micrometers in length with the presence of catalysts while oxygen was absent. The composition and morphology of the as-obtained Fe 3O4@C core-shell structures were characterized by advanced structural, spectroscopic, and imaging techniques. The magnetic measurement at room temperature indicates that the values of saturation magnetization (22.5 emu/g) and coercivity (152.9 Oe) of the one-dimensional Fe3O 4@C core-shell structures are different from those of Fe 3O4 nanoparticles and bulk Fe3O4 due to the different carbon content, dipolar interaction, size, and morphology of the products. The results indicate that the one-dimensional Fe3O 4@C core/shell structures possess well acid resistance. © 2013 American Chemical Society.

Cao J.,Jiangsu University | Shi F.,Shandong Lvdu Bio technique Industry
Evolutionary Bioinformatics | Year: 2012

Rapid alkalinization factors (RALFs) are plant small peptides that could induce a rapid pH increase in the medium of plant cell suspension culture and play a critical role in plant development. The evolutionary process of the RALF gene family remains unclear. To obtain details of the phylogeny of these genes, this study characterized RALF genes in Arabidopsis, rice, poplar and maize. Phylogenetic trees, evolutionary patterns and molecular evolutionary rates were used to elucidate the evolutionary process of this gene family. In addition, the different signatures of selection, expression patterns, and subcellular localization of RALFs were also analyzed. We found that the RALF gene family had a rapid birth process after the separation of the eudicot and monocot species about 145 million years ago, that tandem duplication played a dominant role in the expansion of Arabidopsis and rice RALF gene family, and that RALFs were under purifying selection according to estimations of the substitution rates of these genes. We also identified a diverse expression pattern of RALF genes and predominant extracellular localization feature of RALF proteins. Our findings shed light on several key differences in RALF gene family evolution among the plant species, which may provide a scaffold for future functional analysis of this family. © the author(s), publisher and licensee Libertas Academica Ltd.

Zhu G.,Jiangsu University | Xu H.,Jiangsu University | Xiao Y.,Jiangsu University | Liu Y.,Jiangsu University of Science and Technology | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2012

Hierarchically porous CuO architectures were successfully fabricated via copper basic carbonate precursor obtained with a facile hydrothermal route. The shape of the precursor is preserved after its conversion to porous CuO architectures by calcination. The obtained CuO are systemically characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller N 2 adsorption-desorption analysis. The results reveal that hierarchical CuO microspheres are monoclinic structure and are assembled by porous single-crystal sub-microplatelets. The Brunauer-Emmett-Teller N 2 adsorption-desorption analysis indicates that the obtained CuO has a surface area of 12.0 m 2/g with pore size of around 30 nm. The gas sensing performance of the as-prepared hierarchical CuO microspheres were investigated towards a series of typical organic solvents and fuels. They exhibit higher sensing response than that of commercial CuO powder. Their sensing properties can be further improved by loading of Ag nanoparticles on them, suggesting their potential applications in gas sensors. © 2012 American Chemical Society.

Fang Y.,University of Houston | Bhyrappa P.,University of Houston | Bhyrappa P.,Indian Institute of Technology Madras | Ou Z.,University of Houston | And 2 more authors.
Chemistry - A European Journal | Year: 2014

A series of planar and nonplanar free-base b-pyrrole substituted meso-tetraarylporphyrins were characterized by electrochemistry, spectroelectrochemistry, and protonation or deprotonation reactions in neutral, acidic, and basic solutions of CH2Cl2. The neutral compounds are represented as H2(P), in which P represents a porphyrin dianion with one of several different sets of electron-withdrawing or -donating substituents at the messo and/or b-pyrrole positions of the macrocycle. The conversion of H2(P) to [H4(P)]2+ in CH2Cl2 was accomplished by titration of the neutral porphyrin with trifluoroacetic acid (TFA) while the progress of the protonation was monitored by UV/Vis spectroscopy, which was also used to calculate logb2 for proton addition to the core nitrogen atoms of the macrocycle. Cyclic voltammetry was performed after each addition of TFA or TBAOH to CH2Cl2 solutions of the porphyrin and half-wave potentials for reduction were evaluated as a function of the added acid or base concentration. Thin-layer spectroelectrochemistry was used to obtain UV/Vis spectra of the neutral and protonated or deprotonated porphyrins under the application of an applied reducing potential. The magnitude of the protonation constants, the positions of λmax in the UV/Vis spectra and the half-wave or peak potentials for reduction are then related to the electronic properties of the porphyrin and the data evaluated as a function of the planarity or nonplanarity of the porphyrin macrocycle. Surprisingly, the electroreduction of the diprotonated nonplanar porphyrins in acid media leads to H2(P), whereas the nonplanar H2(P) derivatives are reduced to [(P)]2- in CH2Cl2 containing 0.1m tetra-n-butylammonium perchlorate (TBAP). Thus, in both cases an electrochemically initiated deprotonation is observed. © 2014 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.

Wu D.J.,Nanjing University | Wu D.J.,Jiangsu University | Wu D.J.,Nagoya University | Jiang S.M.,Jiangsu University | And 3 more authors.
Optics Express | Year: 2013

A three-layered Ag-low-permittivity (LP)-high-permittivity (HP) nanoshell is proposed as a plausible meta-atom for building the three-dimensional isotropic negative refractive index metamaterials (NIMs). The overlap between the electric and magnetic responses of AgLPHP nanoshell can be realized by designing the geometry of the particle, which can lead to the negative electric and magnetic polarizabilities. Then, the negative refractive index is found in the random arrangement of AgLPHP nanoshells. Especially, the modulation of the middle LP layer can move the negative refractive index range into the visible region. Because the responses arise from the each meta-atom, the metamaterial is intrinsically isotropic and polarization independent. It is further found with the increase of the LP layer thickness that the negative refractive index range of the random arrangement shows a large blue-shift and becomes narrow. With the decrease of the filling fraction, the negative refractive index range shows a blue-shift and becomes narrow while the maximum of the negative refractive index decreases. © 2013 Optical Society of America.

Zhang L.,Jiangsu University | Zhang L.,Jiangsu University of Science and Technology | Han J.-G.,Jiangsu University | He C.-W.,Jiangsu University | Guo Y.-H.,Jiangsu University
Journal of Materials Science: Materials in Electronics | Year: 2013

With more consumer products moving towards environmentally friendly packaging, making solder Pb-free has become an urgent task for electronics assemblies. Solder joints are responsible for both electrical and mechanical connections. Solder joint does not have adequate ductility to ensure the repeated relative displacements due to the mismatch between expansion coefficients of the chip carrier and the circuit board. Materials behavior of solder joints involves a creep-fatigue interaction, making it a poor material for mechanical connections. The reliability of solder joints of electronics components has been found playing a more important role in service for microelectronics components and micro-electro-mechanical systems. So many researchers in the world investigated reliability of solder joints based on finite element simulation and experiments about the electronics devices, such as CR, QFP, QFN, PLCC, BGA, CSP, FCBGA and CCGA, which were reviewed systematically and extensively. Synchronously the investigation on reliability of solder joints was improved further with the high-speed development of lead-free electronic packaging, especially the constitutive equations and the fatigue life prediction equations. In this paper, the application and research status of constitutive equations and fatigue life prediction equations were reviewed, which provide theoretic guide for the reliability of lead-free solder joints. © 2012 Springer Science+Business Media, LLC.

Qu J.,Changzhou University | Lai C.,Jiangsu University
Journal of Nanomaterials | Year: 2013

Titanium dioxide (TiO2) is star materials due to its remarkable optical and electronic properties, resulting in various applications, especially in the fields of dye-sensitized solar cells (DSSCs). Photoanode is the most important part of the DSSCs, which help to adsorb dye molecules and transport the injected electrons. The size, structure, and morphology of TiO2 photoanode have been found to show significant influence on the photovoltaic performance of DSSCs. In this paper, we briefly summarize the synthesis and properties of one-dimensional (1D) TiO2 nanomaterials (bare 1D TiO2 nanomaterial and 1D hierarchical TiO2) and their photovoltaic performance in DSSCs. © 2013 Jie Qu and Chao Lai.

Zhang J.,Soochow University of China | Jiang J.,Soochow University of China | Li Y.,Jiangsu University | Zhao Y.,Soochow University of China | Wan X.,Soochow University of China
Organic Letters | Year: 2013

A new α-amino acid esters formation reaction has been developed via decarboxylation. The methodology is distinguished by its practical novelty in terms of the readily accessible starting materials, environmentally benign reaction conditions and waste streams, and wide substrate scope. © 2013 American Chemical Society.

Jiang B.,Jiangsu University | Wang X.,Jiangsu University | Xu H.-W.,Jiangsu University | Tu M.-S.,Jiangsu University | And 3 more authors.
Organic Letters | Year: 2013

Highly selective four-component domino multicyclizations for the synthesis of new fused acridines and azaheterocyclic skeletons have been established by mixing common reactants in isobutyric acid under microwave irradiation. The reactions proceeded at fast rates and were conducted to completion within 20-30 min. Up to seven new chemical bonds, four rings, and four stereocenters were assembled in a convenient one-pot operation. The resulting hexacyclic and pentacyclic fused acridines and their stereochemistry have been fully characterized and determined by X-ray structural analysis. © 2013 American Chemical Society.

Wu D.,Nanjing University | Wu D.,Jiangsu University | Liu X.,Nanjing University
Applied Physics Letters | Year: 2010

The far- and near-field properties of Au/Ag alloy nanoshell have been investigated by using Mie theory. With increasing Au content in shell, the dipole peak of alloy nanoshell shows a redshift from that of Ag nanoshell to that of Au nanoshell. It is found that the effect of the variation in shell thickness on the near-field for Au/Ag alloy nanoshells plays dominant role and the variation in the Au content leads to a significant modulation. We have further found that the near-infrared excitation at smaller wavelength can induce stronger near-field in Au/Ag alloy nanoshell with suitable geometry. © 2010 American Institute of Physics.

Wang S.,Jiangsu University | Tang Q.,Shenyang Medical College | Qian W.,Jiangsu University | Fan Y.,Jiangsu University
Allergy: European Journal of Allergy and Clinical Immunology | Year: 2012

Background: Chinese herbal medicine (CHM) has been used for the prevention and treatment of persistent allergic rhinitis (PAR), but results are still equivocal. This study was to assess the clinical effectiveness of CHM in patients with PAR. Materials and methods: Databases searched included articles published in the Cochrane library, MEDLINE, EMBASE, China National Knowledge Infrastructure, and Wanfang database from 1999 to 2011. The studies included were randomized controlled trials (RCTs) comparing CHM to placebo if they included patients with PAR. The main outcomes were the changes in the standardized mean difference (SMD) of nasal symptom scores and total serum IgE level. Methodological quality was assessed by the modified Jadad's scale. Results: Seven RCTs with 533 patients were identified and analyzed. In the metaanalysis, CHM reduced the total nasal symptom scores compared to placebo (SMD, -1.82; 95% confidence interval [CI], -3.03 to -0.62; P = 0.003). The effect estimate was in favor of the CHM intervention (SMD, -1.09; 95% CI, -2.74 to 0.55) in reducing the total serum IgE level, although this was not significant (P = 0.19). Conclusions: CHM interventions appear to have beneficial effects in patients with PAR. However, the published efficacy studies are too small to draw firm conclusion. © 2012 John Wiley & Sons A/S.

Lu J.,Changzhou University | Zhao D.,Jiangsu University | Ji W.,Jiangsu University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

In order to lessen picking time of apple harvesting robot, the fast tracing recognition method of target fruit for apple harvesting robot was researched. Firstly, the first collected image was segmented by the OTSU dynamic threshold segmentation method based on R-G color feature, and the picking target fruit was determined based on the principle of the nearest to image center. Next, the target fruit in the follow images were traced and recognized with the improved fast mean-residual normalized product correlation template matching algorithm while the region of image process idea was smaller frame-by-frame continuously according to the correlated information between the acquired images. At last, the comparative tests, which took into account of different threshold segmentation methods, different matching recognition by gray value, brightness and contrast, and the recognition time with the new and old methods, were done, and results from experiments indicated that the method used is viable, decreases by 36%.

Yang J.,China Pharmaceutical University | Lu Y.,China Pharmaceutical University | Yang J.,Center for Drug Evaluation | Zhang H.,Jiangsu University
Clinical Pharmacokinetics | Year: 2013

Background and Objectives: Many attempts have been made to predict the warfarin maintenance dose in patients beginning warfarin therapy using a descriptive model based on multiple linear regression. Here we report the first attempt to develop a comprehensive mechanistic model integrating in vitro-in vivo extrapolation (IVIVE) with a pharmacokinetic-pharmacodynamic model to predict the warfarin maintenance dose in Han Chinese patients. The model incorporates demographic factors [sex, age, body weight (BW)] and the genetic polymorphisms of cytochrome P450 (CYP) 2C9 (CYP2C9) and vitamin K epoxide reductase complex subunit 1 (VKORC1). Methods: Information on the various factors, mean warfarin daily dose and International Normalized Ratio (INR) was available for a cohort of 197 Han Chinese patients. Based on in vitro enzyme kinetic parameters for S-warfarin metabolism, demographic data for Han Chinese and some scaling factors, the S-warfarin clearance (CL) was predicted for patients in the cohort with different CYP2C9 genotypes using IVIVE. The plasma concentration of S-warfarin after a single oral dose was simulated using a one-compartment pharmacokinetic model with first-order absorption and a lag time and was combined with a mechanistic coagulation model to simulate the INR response. The warfarin maintenance dose was then predicted based on the demographic data and genotypes of CYP2C9 and VKORC1 for each patient and using the observed steady-state INR (INRss) as a target value. Finally, sensitivity analysis was carried out to determine which factor(s) affect the warfarin maintenance dose most strongly. Results: The predictive performance of this mechanistic model is not inferior to that of our previous descriptive model. There were significant differences in the mean warfarin daily dose in patients with different CYP2C9 and VKORC1 genotypes. Using IVIVE, the predicted mean CL of S-warfarin for patients with CYP2C9*1/*3 (0.092 l/h, n = 11) was 57 % less than for those with wild-type*1/*1 (0.215 l/h, n = 186). In addition,*1/*1 patients needed about 1 week to reach steady state, whereas*1/*3 patients needed about 2 weeks. In terms of the predicted INRss values, only ten patients had INRss values outside the expected therapeutic range (1.5-2.8). To evaluate our mechanistic model, we predicted the warfarin maintenance dose for 183 patients and explained 42 % of its variation, which is comparable to our previous prediction using a descriptive model based on multiple linear regression. The mean predicted/observed warfarin doses (mg/day) for different combinations of CYP2C9 and VKORC1 genotypes were 1.54/3.75 (n = 1) for*1/*1 and GG, 3.33/3.66 (n = 36) for*1/*1 and AG, 2.31/2.41 (n = 136) for*1/*1 and AA, and 1.56/1.69 (n = 10) for*1/*3 and AA, respectively. Sensitivity analysis indicated BW and genetic polymorphisms of CYP2C9 and VKORC1 were important factors affecting the warfarin maintenance dose in the study population. Conclusion: The mechanistic model reported is the first to integrate IVIVE with a pharmacokinetic-pharmacodynamic model to describe the association of the warfarin maintenance dose with sex, age, BW and the genotypes of CYP2C9 and VKORC1. The model was effective in predicting S-warfarin clearance and in simulating its plasma concentration-time curve in a cohort of Han Chinese patients. In addition, the model accurately predicted the INR response and warfarin maintenance dose in a cohort of Han Chinese patients. © 2013 Springer International Publishing Switzerland.

Jiang B.,Jiangsu University | Ye Q.,Jiangsu University | Fan W.,Jiangsu University | Wang S.-L.,Jiangsu University | And 3 more authors.
Chemical Communications | Year: 2014

A novel four-component strategy for the selective synthesis of fused azepino[5,4,3-cd]indoles and pyrazolo [3,4-b]pyridines has been established. The bond-forming efficiency, accessibility of starting materials and substrate scope provide invaluable access to tetra-, and bis-heterocyclic scaffolds. This journal is © the Partner Organisations 2014.

Wang Y.-Z.,Jiangsu University | Zhang X.-B.,Nanjing University of Science and Technology | Song X.-N.,Jiangsu University
Acta Mechanica | Year: 2014

In this paper, a new theory of generalized thermoelasticity has been proposed by taking into account the general heat conduction law, which depends on the motion of the thermomass defined as the equivalent mass of phonon gas in dielectrics according to Einstein's mass-energy relation and involves the inertia effect on the time and space of the heat flux and temperature. The formulations are derived and given for anisotropic heterogeneous and isotropic homogenous materials. The uniqueness theorem of equations for the isotropic homogenous materials is proved. By comparison with the other theories of generalized thermoelasticity, the theory based on the motion of thermomass is more reasonable to predict the propagation of thermal and elastic waves in the microscale heat conduction conditions. © 2013 Springer-Verlag Wien.

Liu Y.,Jiangsu University | Liu Y.,Changzhou University | Zhang H.-H.,Jiangsu University | Zhang Y.-C.,Jiangsu University | And 3 more authors.
Chemical Communications | Year: 2014

An organocatalytic asymmetric allylation of 3-indolylmethanol has been established via hydrogen-bond activating mode, which directly assembles isatin-derived 3-indolylmethanols and o-hydroxystyrenes into chiral allyl-substituted oxindoles with one all-carbon quaternary stereogenic center and one newly formed CC bond in excellent enantioselectivity and (Z)-selectivity (up to 97% ee, >201 Z/E ratio). This transformation provides an efficient strategy for asymmetric C3-functionalization of indoles and allylation of 3-indolylmethanols with precise control of the stereoselectivity in the formation of C-C and CC bonds. This journal is © the Partner Organisations 2014.

Wu D.,Nanjing University | Wu D.,Jiangsu University | Jiang S.,Jiangsu University | Liu X.,Nanjing University
Journal of Physical Chemistry C | Year: 2012

The Fano-like resonance properties of the asymmetric dimer for gold nanowires (GNWs) with elliptical section have been investigated based on the 2-D finite element method (2D-FEM). It is found that the reduced symmetry in the GNWs dimer will cause a distinct Fano dip in the absorption spectrum, which arises from the coherent coupling between the superradiant bright mode and the subradiant dark mode. With the increase in the rotation angle of one GNW, the Fano dip in the absorption of the asymmetric dimer enhances first and then reduces. We have further found that the Fano dip in the absorption becomes wider and deeper with the decrease in the separation between two GNWs, whereas the Fano minimum shows a distinct red shift. The tunability in Fano-like resonance of the asymmetric dimer for the GNWs may provide effective applications in sensing and plasmon-induced transparency. © 2012 American Chemical Society.

Cui H.,University of Hawaii at Manoa | Cui H.,Jiangsu University | Yang K.,University of Hawaii at Manoa | Pagaling E.,University of Hawaii at Manoa | Yan T.,University of Hawaii at Manoa
Applied and Environmental Microbiology | Year: 2013

Recent studies have reported high levels of fecal indicator enterococci in marine beach sand. This study aimed to determine the spatial and temporal variation of enterococcal abundance and to evaluate its relationships with microbial community parameters in Hawaii beach sand and water. Sampling at 23 beaches on the Island of Oahu detected higher levels of enterococci in beach foreshore sand than in beach water on a mass unit basis. Subsequent 8-week consecutive samplings at two selected beaches (Waialae and Kualoa) consistently detected significantly higher levels of enterococci in backshore sand than in foreshore/nearshore sand and beach water. Comparison between the abundance of enterococci and the microbial communities showed that enterococci correlated significantly with total Vibrio in all beach zones but less significantly with total bacterial density and Escherichia coli. Samples from the different zones of Waialae beach were sequenced by 16S rRNA gene pyrosequencing to determine the microbial community structure and diversity. The backshore sand had a significantly more diverse community and contained different major bacterial populations than the other beach zones, which corresponded to the spatial distribution pattern of enterococcal abundance. Taken together, multiple lines of evidence support the possibility of enterococci as autochthonous members of the microbial community in Hawaii beach sand. © 2013, American Society for Microbiology.

Xiang J.,Jiangsu University of Science and Technology | Chu Y.,Jiangsu University of Science and Technology | Shen X.,Jiangsu University | Zhou G.,Jiangsu University of Science and Technology | Guo Y.,Jiangsu University of Science and Technology
Journal of Colloid and Interface Science | Year: 2012

Uniform Co 1-xNi xFe 2O 4 (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) nanofibers with average diameter of 110nm and length up to several millimeters were prepared by calcination of electrospun precursor nanofibers containing polymer and inorganic salts. The as-spun and calcined nanofibers were characterized in detail by TG-DTA, XRD, FE-SEM, TEM, SAED and VSM, respectively. The effect of composition of the nanofibers on the structure and magnetic properties were investigated. The nanofibers are formed through assembling magnetic nanoparticles with poly(vinyl pyrrolidone) as the structure-directing template. The structural characteristics and magnetic properties of the resultant nanofibers vary with chemical composition and can be tuned by adjusting the Co/Ni ratio. Both lattice parameter and particle size decrease gradually with increasing nickel concentration. The saturation magnetization and coercivity lie in the range 29.3-56.4emu/g and 210-1255 Oe, respectively, and both show a monotonously decreasing behavior with the increase in nickel concentration. Such changes in magnetic properties can mainly be attributed to the lower magnetocrystalline anisotropy and the smaller magnetic moment of Ni 2+ ions compared to Co 2+ ions. Furthermore, the coercivity of Co-Ni ferrite nanofibers is found to be superior to that of the corresponding nanoparticle counterparts, presumably due to their large shape anisotropy. These novel one-dimensional Co-Ni ferrite magnetic nanofibers can potentially be used in micro-/nanoelectronic devices, microwave absorbers and sensing devices. © 2012 Elsevier Inc.

Chen M.-B.,Jiangsu University | Wei M.-X.,Nanjing Medical University | Han J.-Y.,Tongji University | Wu X.-Y.,Jiangsu University | And 4 more authors.
Cellular Signalling | Year: 2014

The earlier studies have shown that Fascin1 (FSCN1), the actin bundling protein, is over-expressed in colorectal cancers, and is associated with cancer cell progression. Here, we aimed to understand the molecular mechanisms regulating FSCN1 expression by focusing on mammalian target of rapamycin (mTOR) signaling and its regulator microRNA-451. We found that microRNA-451 was over-expressed in multiple colorectal cancer tissues, and its expression was correlated with mTOR complex 1 (mTORC1) activity and FSCN1 expression. In cultured colorectal cancer HT-29 cells, knockdown of FSCN1 by RNAi inhibited cell migration and proliferation. Activation of mTORC1 was required for FSCN1 expression, HT-29 cell migration and proliferation, as RAD001 and rapamycin, two mTORC1 inhibitors, suppressed FSCN1 expression, HT-29 cell migration and proliferation. Meanwhile, forced activation of AMP-activated protein kinase (AMPK), the negative regulator of mTORC1, by its activators or by the genetic mutation, inhibited mTORC1 activation, FSCN1 expression, cell migration and proliferation. In HT-29 cells, we found that over-expression of microRNA-451 inhibited AMPK activation, causing mTORC1 over-activation and FSCN1 up-regulation, cells were with high migration ability and proliferation rate. Significantly, these effects by microRNA-451 were largely inhibited by mTORC1 inhibitors or the AMPK activator AICAR. On the other hand, knockdown of miRNA-451 by the treatment of HT-29 cells with miRNA-451 antagomir inhibited mTORC1 activation and FSCN1 expression. The proliferation and migration of HT-29 cells after miRNA-45 knockdown were also inhibited. Our results suggested that the over-expressed microRNA-451 in colon cancer cells might inhibit AMPK to activate mTORC1, which mediates FSCN1 expression and cancer cell progression. © 2013 .

Wang L.-M.,Jiangsu University | Shi Y.,Nanjing University of Science and Technology
Sensors | Year: 2011

Replica attack is a critical concern in the security of wireless sensor networks. We employ mobile nodes as patrollers to detect replicas distributed in different zones in a network, in which a basic patrol detection protocol and two detection algorithms for stationary and mobile modes are presented. Then we perform security analysis to discuss the defense strategies against the possible attacks on the proposed detection protocol. Moreover, we show the advantages of the proposed protocol by discussing and comparing the communication cost and detection probability with some existing methods. © 2011 by the authors; licensee MDPI, Basel, Switzerland.

Bai S.,Jiangsu University | Shen X.,Jiangsu University | Zhu G.,Jiangsu University | Xu Z.,Nanjing University | Yang J.,Jiangsu University
CrystEngComm | Year: 2012

FeNi alloy nanoflowers were evenly grown on reduced graphene oxide (RGO) nanosheets by the reduction of Fe 2+ and Ni 2+ with hydrazine in an ethylene glycol (EG) dispersion of graphene oxide (GO), and the as-synthesized products were characterized by powder X-ray diffraction (XRD), Raman spectra, energy dispersive X-ray spectroscopy (EDS), inductively coupled plasma optical emission spectrometry (ICP-OES), and transmission electron microscopy (TEM). It was revealed that the morphology, size and composition of the FeNi alloy nanoparticles on the RGO nanosheets can be well controlled by adjusting synthesis parameters such as the concentration and the molar ratio of the metal ions. Through directed-flow assembly of the obtained composite materials, RGO-based magnetic papers were obtained. The RGO-FeNi alloy composites had soft magnetic characteristics and showed interesting morphology and composition dependent magnetic properties. © 2012 The Royal Society of Chemistry.

Zhu G.,Jiangsu University | Liu Y.,Jiangsu University of Science and Technology | Xu H.,Jiangsu University | Chen Y.,Jiangsu University | And 2 more authors.
CrystEngComm | Year: 2012

We present a facile photochemical route to load Ag nanoparticles on hierarchical ZnO microspheres forming Ag-ZnO nanocomposites, which were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and Raman spectroscopy. The results reveal that Ag nanoparticles with average diameters of 5-6 nm are uniformly deposited on the surface of ZnO, and there are not any voids or organic linkers or surfactants at the interfaces between Ag and ZnO. The distribution density of Ag nanoparticles on ZnO can be tuned by the concentration of the silver precursor. In addition, the hierarchical ZnO microspheres and Ag-ZnO nanocomposites were configured as high performance sensors to detect ethanol and formaldehyde. Importantly, in comparison with the pure ZnO microspheres, the Ag-loaded ZnO nanocomposite sensors show 8.9-fold and 2.1-fold enhancement in gas responses to 100 ppm of ethanol and formaldehyde at 350 °C, respectively. This enhancement may originate from the effective chemisorption of molecular oxygen or atomic oxygen on Ag in the Ag-ZnO nanocomposites.

Min B.,Jiangsu University | Ma W.,Changchun University of Science and Technology
Journal of Luminescence | Year: 2013

In this paper, we construct core-shell-shell structured nanoparticles, where magnetic Fe3O4 nanoparticles are used as the inner core, mesoporous silica functionalized with phosphorescent Ru(II) complex is used as the outer shell, and the middle shell which is composed of amorphous silica is introduced to minimize the negative effect from the inner core on the sensing probes. The obtained magnetic-luminescent composite nanoparticles are characterized by XRD analysis, IR spectrum, electron microscopy, fluorescence microscopy, thermogravimetric analysis and nitrogen adsorption and desorption, confirming the core-shell-shell structure. The magnetic and photophysical properties of the composite nanoparticles are investigated in detail. Data suggest that the nanoparticles show a smaller saturation magnetization value compared with that of Fe3O4 nanoparticles. The composite namoparticles are red-emitting ones, and the emission is sensitive towards oxygen concentration variations with sensitivity of 4.1 and response time of 7 s. © 2013 Elsevier B.V. All rights reserved.

Han T.-W.,Jiangsu University | He P.-F.,Tongji University
Wuli Xuebao/Acta Physica Sinica | Year: 2010

The relaxation properties of single layer and multilayer graphene sheets were investigated using molecular dynamics simulation with REBO and AIREBO bond-order interatomic potential, respectively. The dynamic evolution of graphene sheets during relaxation was analyzed. The simulation shows that the sheets are not perfectly flat after relaxation, but show microscopic wavy corrugations at the sheets edges, but not in other areas. In addition, the waviness at the edges of multilayer graphene sheets is a little less than that of the single layer sheets. © 2010 Chin. Phys. Soc.

Ji Z.,Jiangsu University | Shen X.,Jiangsu University | Zhu G.,Jiangsu University | Zhou H.,Jiangsu University of Science and Technology | Yuan A.,Jiangsu University of Science and Technology
Journal of Materials Chemistry | Year: 2012

Graphene, which possesses unique nanostructure and excellent properties, is considered a low cost alternative to carbon nanotubes in nanocomposites. In this paper, we demonstrate a facile in situ reduction approach for the synthesis of reduced graphene oxide/Ni (RGO/Ni) nanocomposites with different morphologies. The concentration of nickel ions has a great influence on the morphology of the RGO/Ni nanocomposites and an interesting RGO-wrapped nanostructure was obtained. Magnetic studies reveal a room-temperature ferromagnetic behavior of the RGO/Ni nanocomposites. The catalytic activities of the RGO/Ni nanocomposites were investigated for the reduction of p-nitrophenol by NaBH 4. It was found that the nanocomposites show higher catalytic activity compared with the unsupported Ni nanoparticles. The catalytic performance of the RGO/Ni nanocomposites was even better than the RANEY® Ni catalyst. Moreover, after completion of the reaction the nanocomposite catalyst can be easily re-collected from the reaction system by a magnet. Thus, the RGO/Ni nanocomposites obtained in this work may find applications in catalysis, data storage, targeted drug transportation and magnetic resonance imaging technologies. © 2012 The Royal Society of Chemistry.

Cao J.,Jiangsu University | Shi F.,Shandong Lvdu Bio Technique Industry
Journal of Biomolecular Structure and Dynamics | Year: 2012

In the present study, a comprehensive analysis of the arginase gene family in metazoans was performed. A total of 126 arginase genes have been identified in 44 species. Phylogenetic analyses indicate that arginase genes consist of four groups. Conservative and divergent gene structures are found among the groups. The syntenies also exist in distantly related genomes among multiple species. Adaptive evolution shows that, while purifying selection may have been the main force driving the evolution of the arginases, some of critical sites responsible for the functional divergence may have been under positive selection. Overall, the data obtained from our investigation contribute to a better understanding of the complexity of the arginase gene family and of the function and evolution of this family in metazoans. Copyright © 2012 Taylor and Francis.

Gao F.,Nanjing University | Gao F.,Jiangsu University | Cui L.,Nanjing University | Song Y.,Nanjing University | And 2 more authors.
Inorganic Chemistry | Year: 2014

Three new single paramagnetic lanthanide-based complexes, [Ln(L)(L OEt)] (Ln3+ = Dy3+, Tb3+, and Ho3+), are synthesized with the multidentate calix[4]arene ligand H2L (H2L = 5,11,17,23-tetrakis(1,1-dimethylethyl)-25,27- dihydroxy-26,28-dimethoxycalix[4]arene) and Kläui's tripodal ligand L OEt - (LOEt - = (η5- cyclopentadienyl)tris(diethylphosphito-p)cobaltate(III)). All of the complexes have been characterized by single crystal X-ray diffraction analysis, thermal stability, absorption spectra, and magnetization measurements. The magnetic properties and magnetostructural correlation in this seven-coordinated system are investigated. The dysprosium complex 1 shows typical single-molecule magnetic behavior with characteristic magnetic hysteresis loops and the slow relaxation of magnetization. © 2013 American Chemical Society.

Shen X.,Jiangsu University | Zhou H.,Jiangsu University | Yan J.,Jiangsu University | Li Y.,Jiangsu University | Zhou H.,Jiangsu University of Science and Technology
Inorganic Chemistry | Year: 2014

Four new cyano-bridged bimetallic complexes, [{MnIII(salen)} 2{FeIII(qcq)(CN)3}2] n·3nCH3CN·nH2O (1) [salen = N,N′-ethylenebis(salicylideneiminato) dianion; qcq- = 8-(2-quinoline-2-carboxamido)quinoline anion], [{MnIII(salpn)} 2{FeIII(qcq)(CN)3}2] n·4nH2O (2) [salpn = N,N′-1,2- propylenebis(salicylideneiminato)dianion], [{MnII(bipy)(CH 3OH)}{FeIII(qcq)(CN)3}2] 2·2H2O·2CH3OH (3) (bipy = 2,2′-bipyridine), and [{MnII(phen)2}{Fe III(qcq)(CN)3}2]·CH 3CN·2H2O (4) (phen = 1,10-phenanthroline) have been synthesized and characterized both structurally and magnetically. The structures of 1 and 2 are both unique 1-D linear branch chains with additional structural units of {MnIII(salen/salpn)}{FeIII(qcq)(CN) 3} dangling on the sides. In contrast, 3 and 4 are cyano-bridged bimetallic hexanuclear and trinuclear clusters, respectively. The intermolecular short contacts such as π-π interactions and hydrogen bonds extend 1-4 into high dimensional supermolecular networks. Magnetic investigation reveals the dominant intramolecula