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Shanghai, China

Donghua University is a public research university in Shanghai, China. Established in 1951, it is a member of China's Project 211 group of national key universities, with a heavy focus on high level technological and scientific research. Among its various departments it is especially well known for engineering, business, and textile design, among which its fashion design, textile engineering, international trade, material science, and information technology departments have been consistently ranked highly in China for decades. Wikipedia.

Chu L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Accounts of Chemical Research | Year: 2014

ConspectusThe trifluoromethyl group is widely prevalent in many pharmaceuticals and agrochemicals because its incorporation into drug candidates could enhance chemical and metabolic stability, improve lipophilicity and bioavailability, and increase the protein bind affinity. Consequently, extensive attention has been devoted toward the development of efficient and versatile methods for introducing the CF3 group into various organic molecules. Direct trifluoromethylation reaction has become one of the most efficient and important approaches for constructing carbon-CF3 bonds. Traditionally, the nucleophilic trifluoromethylation reaction involves an electrophile and the CF3 anion, while the electrophilic trifluoromethylation reaction involves a nucleophile and the CF3 cation. In 2010, we proposed the concept of oxidative trifluoromethylation: the reaction of nucleophilic substrates and nucleophilic trifluoromethylation reagents in the presence of oxidants.In this Account, we describe our recent studies of oxidative trifluoromethylation reactions of various nucleophiles with CF3SiMe3 in the presence of oxidants. We have focused most of our efforts on constructing carbon-CF3 bonds via direct trifluoromethylation of various C-H bonds. We have demonstrated copper-mediated or -catalyzed or metal-free oxidative C-H trifluoromethylation of terminal alkynes, tertiary amines, arenes and heteroarenes, and terminal alkenes. Besides various C-H bonds, aryl boronic acids proved to be viable nucleophilic coupling partners for copper-mediated or -catalyzed cross-coupling reactions with CF3SiMe3. To further expand the reaction scope, we also applied H-phosphonates to the oxidative trifluoromethylation system to construct P-CF3 bonds. Most recently, we developed silver-catalyzed hydrotrifluoromethylation of unactivated olefins. These studies explore boronic acids, C-H bonds, and P-H bonds as novel nucleophiles in transition-metal- mediated or -catalyzed cross-coupling reactions with CF3SiMe 3, opening new viewpoints for future trifluoromethylation reactions. Furthermore, we also achieved the oxidative trifluoromethylthiolation reactions of aryl boronic acids and terminal alkynes to construct carbon-SCF3 bonds by using CF3SiMe3 and elemental sulfur as the nucleophilic trifluoromethylthiolating reagent. These oxidative trifluoromethylation and trifluoromethylthiolation reactions tolerate a wide range of functional groups, affording a diverse array of CF3- and CF3S-containing compounds with high efficiencies, and provide elegant and complementary alternatives to classical trifluoromethylation and trifluoromethylthiolation reactions. Because of the importance of the CF 3 and SCF3 moieties in pharmaceuticals and agrochemicals, these reactions would have potential applications in the life science fields. © 2014 American Chemical Society.

Chen B.,Temple University | Zhang L.,Donghua University
Polymer Testing | Year: 2013

In the European Community, selected phthalate esters (PE) are restricted in their use for the manufacture of toys and childcare articles. As PE are mainly used as plasticizers for poly(vinyl chloride) (PVC), a high sensitivity analytical method was developed to determine the PE content in PVC toys by using ultra high performance liquid chromatography coupled with electronic spray mass spectrum (UPLCMS/MS). The LOD of the method is low to the level of ng/L. The method was verified by specificity, linearity, sensitivity, accuracy and precision. This research will provide a useful and convenient way to monitor the production of PVC toys. © 2013 Elsevier Ltd. All rights reserved.

Xing S.,East China Normal University | Xu H.,Donghua University | Chen J.,Shanghai Entry Exit Inspection and Quarantine Bureau of PRC | Shi G.,East China Normal University | Jin L.,East China Normal University
Journal of Electroanalytical Chemistry | Year: 2011

A silver nanoparticles/Nafion film composite material modified glassy carbon electrode (GCE) was prepared and used as a kind of superior electrochemical sensor for Chromium(VI). Nafion (Nf), a cation-exchange polymer, was employed as the conductive matrix in which Ag nanoparticles (Ag nano) can be tightly attached to the electrode surface. Ag nano were obtained by direct electrodeposition and showed excellent catalytic ability toward Cr(VI) reduction. Such a designed GCE/Nf/Ag nano shows outstanding sensitivity and selectivity to Cr(VI) reduction. A linear relationship between the reduction current and Cr(VI) concentration was obtained covering the concentration range from 2 to 230 ppb with excellent sensitivity (1.1 nA/ppb) and low detection limit (0.67 ppb). The electrochemically formed Agnano were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical techniques. Interference from other heavy metal ions such as Cr3+, Cd2+, Cu2+, and Hg2+ associated with Cr(VI) analysis could be effectively diminished. The practical application of the proposed sensor was carried out for determination of trace level of Cr(VI) in real water sample. The present electrode is reliable, stable, sensitive and low-cost. © 2010 Elsevier B.V. All rights reserved.

Shen B.,Donghua University
International Journal of Fashion Design, Technology and Education | Year: 2016

This paper introduces an apparel distribution game (non-computerised classroom experiment) in the class of fashion supply chain management (FSCM). The apparel distribution game creates a lot of excitement, and helps subjects better understand how the fashion supply chain works. Playing this interactive game provides students an environment of active learning. This paper first introduces how the game was played in the FSCM class and what knowledge students can learn. This game not only provides the important insights of fashion supply chains and helps students understand the complex dynamic systems within the fashion supply chain, but also is fun to play. After playing the apparel distribution game, participants can identify the bullwhip effects and where the bullwhip effects come from. Moreover, participants learn several ways to effectively cope with the bullwhip effects in the fashion supply chains. © The Textile Institute and Informa UK Ltd 2016

Sun Y.,Shanghai University of Engineering Science | Yu L.,Donghua University | Rao P.,Shanghai University of Engineering Science
Journal of Crystal Growth | Year: 2012

Hierarchical self-assembled 3-D ternary Zn 2GeO 4 nanorods have been successfully synthesized using a simple hydrothermal method. They are formed by two basic parts: a 3-D crystal base and 1-D nanorods nucleated from this base. Mechanisms of this micro/nanostructure growth are suggested to be governed by the change of concentration of ammonia and the reaction time during the self-assembly process. Good crystal lattice quality and morphology were demonstrated by XRD, SEM and TEM analyses. The micro/nanostructures are expected to be promoted in construction of micro/nano-optoelectronic devices. © 2012 Elsevier B.V.

Hu J.-B.,Nantong University | Zhao L.-D.,Nantong University | Zhao L.-D.,Donghua University
Wuli Xuebao/Acta Physica Sinica | Year: 2013

The stability theorem of fractional systems is the basis of controlling fractional nonlinear systems. The theorem of fractional nonlinear systems is proved by a new approach in this paper. The results show that the theorem is applicable not only to the fractional nonlinear autonomous system, but also to the fractional nonlinear nonautonomous system. Several examples are analyzed by the theorem, and simulations are carried out, whose results show the effectiveness of the theorem. © Chinese Physical Society.

Wang Y.,Donghua University | Wang Z.,Brunel University | Liang J.,Nanjing Southeast University
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics | Year: 2010

Robust stability serves as an important regulation mechanism in system biology and synthetic biology. In this paper, the robust stability analysis problem is investigated for a class of nonlinear delayed genetic regulatory networks with parameter uncertainties and stochastic perturbations. The nonlinear function describing the feedback regulation satisfies the sector condition, the time delays exist in both translation and feedback regulation processes, and the state-dependent Brownian motions are introduced to reflect the inherent intrinsic and extrinsic noise perturbations. The purpose of the addressed stability analysis problem is to establish some easy-to-verify conditions under which the dynamics of the true concentrations of the messenger ribonucleic acid (mRNA) and protein is asymptotically stable irrespective of the norm-bounded modeling errors. By utilizing a new Lyapunov functional based on the idea of delay fractioning, we employ the linear matrix inequality (LMI) technique to derive delay-dependent sufficient conditions ensuring the robust stability of the gene regulatory networks. Note that the obtained results are formulated in terms of LMIs that can easily be solved using standard software packages. Simulation examples are exploited to illustrate the effectiveness of the proposed design procedures. © 2006 IEEE.

The rapid development of industrialization and urbanization brought about changes in the economic structure, forms of production and lifestyle, resulting in deterioration of the natural and human environment, as well as many intangible cultural landscape degradation. To display intangible cultural heritage landscape in the form of eco-museum aims to achieve harmony between man and nature and human environment. Eco-museum with community residents’ participation in live state display is the way to retain the cultural heritage, is a means of protecting intangible cultural heritage and tradition.In this paper, based on the concept of ecological museum theory and practice, the author makes an overview of the history of establishment of eco-museums in accordance with our national conditions, to avoid the homogenization of intangible cultural heritage display modes,and to improve the cultural landscape heterogeneity and retain historical memory of diverse cultures, to protect natural and cultural environment of the country. © (2014) Trans Tech Publications, Switzerland.

Zhang D.,Donghua University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

Two oxime-based colorimetric probes for the hypochlorite anion (ClO -) have been rationally designed and synthesized on basis of the mechanism of intramolecular charge transfer (ICT). Upon addition of ClO -, the probes displayed around 20 nm redshift in the absorption maximum, accompanied with the color change from orange to pink, which were attributed to the reaction of the oxime groups with ClO - to form aldehyde groups. The probes were highly selective for ClO - detection without the interference of other ions and oxidants. © 2010 Elsevier B.V.

Khan Y.,Donghua University | Austin F.,Hong Kong Polytechnic University
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences | Year: 2010

In this paper, we apply the Laplace decomposition method to obtain series solutions of nonlinear advection equations. The equations are Laplace transformed and the nonlinear terms are represented by Adomian polynomials. The results are in good agreement with those obtained by the Adomian decomposition method and the variational iteration method but the convergence is faster. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.

Wang T.,Shanghai University of Engineering Science | Zhou W.,Donghua University | Zhao S.,Shanghai University of Engineering Science | Yu W.,Shanghai University of Engineering Science
ISA Transactions | Year: 2014

In this paper, the robust exponential synchronization problem for a class of uncertain delayed master-slave dynamical system is investigated by using the adaptive control method. Different from some existing master-slave models, the considered master-slave system includes bounded unmodeled dynamics. In order to compensate the effect of unmodeled dynamics and effectively achieve synchronization, a novel adaptive controller with simple updated laws is proposed. Moreover, the results are given in terms of LMIs, which can be easily solved by LMI Toolbox in Matlab. A numerical example is given to illustrate the effectiveness of the method. © 2013 ISA.

Hou A.,Donghua University | Hou A.,University of California at Davis | Sun G.,University of California at Davis
Carbohydrate Polymers | Year: 2013

Aqueous solutions of 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BPTCD) were successfully employed in treatment of cotton fabrics to bring multiple functions onto the cotton cellulose. The overall reaction mechanism of the chemical finishing process was investigated. Results revealed that the dianhydride groups of BPTCD were hydrolyzed to tetracarboxylic acid groups, and the acid could directly react with hydroxyl groups on cellulose under the catalyst sodium hypophosphite to form ester bonds. Such a mechanism is different from the mostly recognized formation of anhydride from polycarboxylic acid and then esterification between the anhydride with hydroxyl groups. FTIR, DSC and thermogravimetric analyzer (TGA) were employed in the analysis of the reactions, respectively. © 2013 Elsevier Ltd.

Liu H.,Donghua University | Lai X.,Zhejiang Chinese Medical University | Wu W.,Zhejiang University
Robotics and Computer-Integrated Manufacturing | Year: 2013

In this paper a high smooth trajectory planning method is presented to improve the practical performance of tracking control for robot manipulators. The strategy is designed as a combination of the planning with multi-degree splines in Cartesian space and multi-degree B-splines in joint space. Following implementation, under the premise of precisely passing the via-points required, the cubic spline is used in Cartesian space planning to make either the velocities or the accelerations at the initial and ending moments controllable for the end effector. While the septuple B-spline is applied in joint space planning to make the velocities, accelerations and jerks bounded and continuous, with the initial and ending values of them configurable. In the meantime, minimum-time optimization problem is also discussed. Experimental results show that, the proposed approach is an effective solution to trajectory planning, with ensuring a both smooth and efficiency tracking performance with fluent movement for the robot manipulators. © 2012 Elsevier Ltd. All rights reserved.

Wang L.,Shanghai Key Laboratory of Modern Optical Systems | Wei G.,Shanghai Key Laboratory of Modern Optical Systems | Shu H.,Donghua University
Neurocomputing | Year: 2013

In this paper, the H∞ state estimation problem is investigated for a class of discrete-time complex networks with randomly occurring phenomena. The proposed randomly occurring phenomena include both probabilistic missing measurements and randomly occurring coupling delays which are described by two random variable sequences satisfying individual probability distributions, respectively. Rather than the common Lipschitz-type function, a more general sector-like nonlinear function is employed to characterize the nonlinearities in the networks. The purpose of the addressed H∞ state estimation problem is to design a state estimator such that, for all admissible nonlinear disturbances, missing measurements as well as coupling delays, the dynamics of the augmented systems is guaranteed to be exponentially mean-square stable and attenuated to a given H∞ performance level. By constructing a novel Lyapunov-Krasovskii functional and utilizing convex optimization method as well as Kronecker product, we derive the sufficient conditions under which the desired state estimator exists. An illustrative example is exploited to show the effectiveness of the proposed state estimation scheme. © 2013 Elsevier B.V.

Xu Y.,Anhui Agricultural University | Huang C.,Anhui Agricultural University | Wang X.,Donghua University
Carbohydrate Polymers | Year: 2013

For exploiting the novel multifunctional cotton fibers, a collagen protein modified cotton fiber (CPMCF) was prepared by the oxidation of cotton fiber with sodium periodate solution and subsequent crosslinking reaction with an aqueous solution of collagen protein in acetic acid. Infrared spectra and X-ray photoelectron spectrometry (XPS) analysis of the CPMCF illuminated that the CN double bond was formed through the imine reaction of the aldehyde group on oxidized cotton fiber with the amino group of collagen protein. X-ray diffractograms indicated that the crystallinity of the oxidized cotton fiber increased from 65.6 to 69.3% after collagen protein treatment. Scanning electron microscopy photographs displayed that the collagen protein combined on the surface of oxidized cotton fiber. The resulting optimum conditions to prepare the CPMCF achieved the sufficient aldehyde groups in oxidized cotton fiber and the collagen protein content on CPMCF, whereas the mechanical strength of the oxidized cotton fiber had no significant change. Meanwhile, a model experiment for the controlled release of aloe anthraquinone extract on CPMCF showed a satisfactory result compared with those release of the original cotton fiber, demonstrated potential application of the synthetic collagen protein-cotton fiber as a carrier for the sustained release of drugs. © 2012 Elsevier Ltd.

Wu B.H.,Donghua University | Cao J.C.,CAS Shanghai Institute of Microsystem and Information Technology | Timm C.,TU Dresden
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

We study the interplay of polaronic effect and superconductivity in transport through molecular Josephson junctions. The tunneling rates of electrons are dominated by vibronic replicas of the superconducting gap, which show up as prominent features in the differential conductance for the dc and ac current. For relatively large molecule-lead coupling, a features that appears when the Josephson frequency matches the vibron frequency can be identified with an over-the-gap structure observed by Marchenkov. However, we are more concerned with the weak-coupling limit, where resonant tunneling through the molecular level dominates. We find that certain features involving both Andreev reflection and vibron emission show an unusual shift of the bias voltage V at their maximum with the gate voltage V g as V∼(2/3)V g. Moreover, due to the polaronic effect, the ac Josephson current shows a phase shift of π when the bias eV is increased by one vibronic energy quantum ω v. This distinctive even-odd effect is explained in terms of the different sign of the coupling to vibrons of electrons and of Andreev-reflected holes. © 2012 American Physical Society.

Novel spinning solution, prepared by dissolving hydroxyethyl cellulose (HEC) owning a low molar substitution (MS) into NaOH/urea/thiouea aqueous solution with a specific weight ratio of 8:8:6.5, was employed to fabricate a new type of regenerated fibers by wet-spun method. The structure and properties of the resultant HEC fibers were characterized by (13)C NMR, FTIR, synchrotron WAXS, SEM, and tensile tester. The results showed that HEC fibers exhibited structure identical with HEC because of the physical dissolution and coagulation processes, but quite different from native cellulose due to partial breakage of hydrogen bonds and crystal transformation from cellulose I to cellulose II during cellulose modification. The resultant HEC fibers with relatively dense and homogenous structure displayed good moisture related properties and stayed stable in alkali solution with low concentration. Moreover, the novel fibers owned good dry mechanical properties in spit of their slightly poor wet mechanical properties comparable to viscose rayon, showing great potential in substituting the traditional viscose fibers. Copyright © 2013 Elsevier Ltd. All rights reserved.

He J.H.,Soochow University of China | He J.H.,Zhejiang Agriculture And forestry University | He J.H.,Donghua University
Indian Journal of Physics | Year: 2014

A homotopy perturbation method with two expanding parameters is suggested. The method is especially effective for a nonlinear equation with two nonlinear terms, which might have different effects on the solution. A nonlinear oscillator is used as an example to elucidate the solution procedure. © 2013 IACS.

Liu J.-B.,CAS Shanghai Institute of Organic Chemistry | Chen C.,CAS Shanghai Institute of Organic Chemistry | Chu L.,CAS Shanghai Institute of Organic Chemistry | Chen Z.-H.,CAS Shanghai Institute of Organic Chemistry | And 3 more authors.
Angewandte Chemie - International Edition | Year: 2015

Aryl trifluoromethyl ethers (ArOCF3) are prevalent in pharmaceuticals, agrochemicals, and materials. However, methods for the general and efficient synthesis of these compounds are extremely underdeveloped and limited. Herein, we describe a highly efficient and general procedure for the direct O-trifluoromethylation of unprotected phenols through a silver-mediated cross-coupling reaction using CF3SiMe3 as the CF3 source and exogenous oxidants. This novel oxidative trifluoromethylation provides access to a wide range of aryl trifluoromethyl ethers from simple phenols. The mild process was also applied to the late-stage trifluoromethylation of a medicinally relevant compound. Combining two nucleophiles: The direct oxidative O-trifluoromethylation of phenols with CF3SiMe3 provides a general and practical method for the preparation of aryl trifluoromethyl ethers. A wide variety of functional groups are tolerated under these conditions, and the method can also be employed for the late-stage trifluoromethylation of complex pharmaceutically relevant molecules (NFSI= N-fluorobenzenesulfonimide). © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Li B.,Duke University | Li B.,Donghua University | Ye S.,Duke University | Stewart I.E.,Duke University | And 2 more authors.
Nano Letters | Year: 2015

Metal nanowire (NW) networks have the highest performance of any solution-coatable alternative to ITO, but there is as yet no published process for producing NW films with optoelectronic performance that exceeds that of ITO. Here, we demonstrate a process for the synthesis and purification of Ag NWs that, when coated from an ink to create a transparent conducting film, exhibit properties that exceed that of ITO. The diameter, and thus optoelectronic performance, of Ag NWs produced by a polyol synthesis can be controlled by adjusting the concentration of bromide. Ag NWs with diameters of 20 nm and aspect ratios up to 2000 were obtained by adding 2.2 mM NaBr to a Ag NW synthesis, but these NWs were contaminated by nanoparticles. Selective precipitation was used to purify the NWs, resulting in a transmittance improvement as large as 4%. At 130.0 Ω sq-1, the transmittance of the purified Ag NW film was 99.1%. © 2015 American Chemical Society.

Wu J.,Duke University | Wu J.,Donghua University | Zang J.,Duke University | Rathmell A.R.,Duke University | And 2 more authors.
Nano Letters | Year: 2013

This work demonstrates that metal nanowires in a percolating network can reversibly slide across one another. Reversible sliding allows networks of metal nanowires to maintain electrical contact while being stretched to strains greater than the fracture strain for individual nanowires. This phenomenon was demonstrated by using networks of nanowires as compliant electrodes for a dielectric elastomer actuator. Reversible nanowire sliding enabled actuation to a maximum area strain of 200% and repetitive cycling of the actuator to an area strain of 25% over 150 times. During actuation, the transmittance of the network increased 4.5 times, from 13% to 58%. Compared to carbon-based compliant electrodes, networks of metal nanowires can actuate across a broader range of optical transmittance. The widely tunable transmittance of nanowire-based actuators allows for their use as a light valve. © 2013 American Chemical Society.

Rong T.,Donghua University
Advanced Materials Research | Year: 2014

This paper took the indigo Yao women dress of Guangxi Tianlin Badu Yao Village and Yunnan Hekou Yaoshan Village as example to record differences and similarities of the dress forms and styles of two places to learn the characteristics of national costumes by means of field investigation and literature collection. © (2014) Trans Tech Publications, Switzerland.

Xiaofeng L.,Donghua University | Wang M.,Zhejiang University | Zhang Z.,Beihang University
Journal of Mathematical Fluid Mechanics | Year: 2010

We consider the existence of the 2D inviscid Boussinesq equations in critical Besov spaces and obtain some blowup criteria. © 2009 Birkhäuser Verlag, Basel.

Cao X.-B.,Anhui University of Science and Technology | Cao X.-B.,Anhui Province Key Laboratory of Software in Computing and Communication | Du W.-B.,Anhui University of Science and Technology | Du W.-B.,Anhui Province Key Laboratory of Software in Computing and Communication | Rong Z.-H.,Donghua University
Physica A: Statistical Mechanics and its Applications | Year: 2010

The public goods game (PGG) is generally considered as a suitable paradigm to explain ubiquitous cooperative behavior. In this study, we investigated the evolutionary PGG on scale-free networks and studied the effect of individual heterogeneity by setting the cooperator x an investment value correlated to its degree as Ix = N {dot operator} kxβ / ∑j kjβ, where kx is the degree of x, j runs over all players and β is a tunable parameter. It is shown that the cooperation level is remarkably promoted by negative values of β whereas it is highly depressed by positive values of β. Moreover, the effect of environmental noise has also been investigated. Our result may sharpen the understanding of cooperation induced by the individual diversity. © 2009 Elsevier B.V. All rights reserved.

Xia Y.,Australian National University | Fan J.,Donghua University | Hill D.,Australian National University
Physica A: Statistical Mechanics and its Applications | Year: 2010

In this paper, we study the cascading failure in Watts-Strogatz small-world networks. We find that this network model has a heterogeneous betweenness distribution, although its degree distribution is homogeneous. Further study shows that this small-world network is robust to random attack but fragile to intentional attack, in the cascading failure scenario. With comparison to standard random graph and scale-free networks, our result indicates that the robust yet fragile property in the cascading failure scenario is mainly related to heterogeneous betweenness, rather than the network degree distribution. Thus, it suggests that we have to be very careful when we use terms such as homogeneous network and heterogeneous network, unless the distribution we refer to is specified. © 2009 Elsevier B.V. All rights reserved.

Qing F.,CAS Shanghai Institute of Organic Chemistry | Qing F.,Donghua University
Chinese Journal of Organic Chemistry | Year: 2012

Many biologically active compounds contain CF 3 group as the essential motif. As a result, much attention has been paid to the development of new synthetic methods for the introduction of CF 3 group into diverse organic compounds. This review takes a critical look at recent advances of trifluoromethyltion reactions. © 2012 Chinese Chemical Society & SIOC, CAS.

Lu W.,Donghua University | Zhu C.,Xian Jiaotong University
IEEE Transactions on Industrial Electronics | Year: 2010

In this paper, we present the bulk acoustic wave (BAW), the soundelectricity reclamation (SER), and the insertion loss as the three key problems of a wavelet transform processor using surface acoustic wave devices. The solutions to these problems are achieved in this study. The more the number of electrode pairs for the interdigital transducer (IDT) is, the weaker the excited BAW is, so the BAW can be eliminated when the number of electrode pairs for IDT is large enough. The substrate material of a small electromechanical coupling coefficient (ECC) k 2 and the low-impedance load of IDT can eliminate SER. When the output ends of the wavelet transform processors are respectively connected to the amplifiers, their insertion losses can be compensated. X-112°Y LiTaO 3 (small ECC k 2) is used as a substrate material to fabricate the wavelet transform processor. © 2010 IEEE.

Wang Z.,CAS Beijing National Laboratory for Molecular | Wang Z.,Donghua University | Chen C.,CAS Beijing National Laboratory for Molecular | Ma W.,CAS Beijing National Laboratory for Molecular | Zhao J.,CAS Beijing National Laboratory for Molecular
Journal of Physical Chemistry Letters | Year: 2012

The photoreactions between Fe(III)/Fe(II) and low-molecular-weight organic matter (LMWOM) under solar irradiation have significant implications for many biogeochemical cycles on the Earth and for the fates of environmental pollutants. In this Perspective, we focus on several fundamental aspects of the photochemical processes that couple the redox cycling of iron species and transformation of organic substrates. The primary photoprocesses (e.g., intramolecular electron transfer or photodissociation) are first highlighted by introducing the recently disputed observations on the photolysis of ferrioxalate complexes. The effects of LMWOM and its daughter radicals on the photochemical redox cycling of iron species are discussed with special attention given to the example of Fe-malonate complexes. These processes and mechanisms would provide us some refreshed understanding of environmental photochemistry of LMWOM and the iron species and would be helpful for our assessment of photochemical decontamination of organic pollutants. © 2012 American Chemical Society.

Ding B.,Donghua University
Fiber Society's Spring 2015 Conference, in conjunction with the 2015 International Conference on Advanced Fibers and Polymer Materials: Functional Fibers and Textiles - Program | Year: 2015

Three-dimensional (3D) nanofibrous aerogels (NFAs) that are both highly compressible and resilient would have broad technological implications; however, creating such NFAs has proven extremely challenging. Here, we report a novel strategy to create fibrous, isotropically-bonded elastic reconstructed (FIBER) NFAs with a hierarchical cellular structure and superelasticity by combining electrospun nanofibers and the fibrous freeze-shaping technique. Our approach causes the intrinsically lamellar deposited electrospun nanofibers to assemble into elastic bulk aerogels with tunable densities and desirable shapes. The resulting FIBER NFAs exhibit densities of > 0.12 mg cm-3, rapid recovery from deformation, and multifunctionality in terms of the thermal insulation, sound absorption, emulsion separation, and elasticity-responsive electric conduction. The successful synthesis of such fascinating materials may provide new insights into the design and development of multifunctional NFAs for various applications.

Chen M.,Donghua University
2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce, AIMSEC 2011 - Proceedings | Year: 2011

Network traffic is an important load indicator that reflects the performance of the web system. Short-term forecast of web traffic is the base of effective overload control. Because of the complex and ever-changing network environment, web traffic is shown the characteristics of random and unexpected at most of the time scales. Hence, it is more difficult to improve the accuracy of traffic forecasts to get satisfactory results. In this paper, genetic algorithm is used in artificial neural network to optimize the structure design and weights firstly. Then, a web traffic forecasting model based on genetic neural network is proposed. The simulation result shown that the forecast result of this model is better than that based on BP and Elman neural network prediction model. © 2011 IEEE.

Xu Z.,Hiroshima University | Xu Z.,Donghua University | Nakamura K.,Hiroshima University | Timerbaev A.R.,RAS Vernadsky Institute of Geochemistry and Analytical Chemistry | Hirokawa T.,Hiroshima University
Analytical Chemistry | Year: 2011

Electrokinetic supercharging (EKS) is a powerful and practical method for multifold in-line concentration of various analytes prior to capillary electrophoresis (CE) analysis. However, a problem of insufficient sensitivity has always existed when trace analyte quantification by EKS-CE is a target, especially when coupled with conventional detectors. Normally this requires a greatly increased amount of analyte injected without separation degradation. In this contribution, we have shown that it is possible to substantially improve analyte loading and hence CE method detectability by modifying sample introduction configuration. The volume of sample vial was increased (from typical 500 μL to 17 mL), the common wire electrode was replaced by a ring electrode, and the sample solution was stirred. With these alterations, more analyte ions are accumulated within the effective electric field during electrokinetic injection and then maintained as focused zones due to transient isotachophoresis. The versatility of the customized EKS-CE approach for sample concentration was demonstrated for a mixture of seven rare-earth metal ions with an enrichment factor of 500 000 giving detection limits at or below 1 ng/L. These detection limits are over 100 000 times better than can be achieved by normal hydrodynamic injection, 1000 times better than the sensitivity thresholds of inductively coupled plasma atomic emission spectrometry (ICP-AES), and even close to those of inductively coupled plasma mass spectrometry (ICPMS). © 2010 American Chemical Society.

Lu Z.,University of Louisville | Han J.,University of Louisville | Hammond G.B.,University of Louisville | Xu B.,Donghua University
Organic Letters | Year: 2015

An excess amount of silver salt to generate cationic gold from a gold catalyst precursor such as L-Au-Cl almost always has adverse effects on the reactivity of the cationic gold catalyst. A preformed L-Au+X- complex, generated by sonication followed by centrifugation, increases the reactivity in a gold catalyzed reaction. The adverse silver effect might be caused by the interaction of silver salts with gold intermediates. © 2015 American Chemical Society.

Wei S.,Anyang University, China | Wang S.,Anyang University, China | Zhang Y.,Henan University of Urban Construction | Zhou M.,Donghua University
Sensors and Actuators, B: Chemical | Year: 2014

Different morphologies of ZnO nanomaterials (long nanofibers, rod-like short nanofibers and nano-powders) were successfully synthesized by electrospinning process and chemical precipitation, respectively. A comparative ethanol sensing study among the three samples were also performed. The results indicate that the ZnO long nanofiber sensor shows desirable response to ethanol at 270 C with good stability, which is attributed to the long nanofiber structures. This sample also presents good selectivity and fast response-recovery properties (7-9 and 9-11 s, respectively). The ethanol sensing mechanism and the advantages of the long nanofiber structure in sensing materials were also discussed. © 2013 Elsevier B.V.

Xia Y.,Zhejiang University | Fan J.,Donghua University
Proceedings - IEEE International Symposium on Circuits and Systems | Year: 2011

We study the tolerance of complex networks to attacks. Due to the large network scale, it is almost impossible for an attacker to have the complete topology information about the whole network. Thus, an efficient attack strategy based on partial degree information is proposed. Using the generating function method we give the exact solution for the attack strategy. A theoretical scale-free random network and the real Internet data are considered as examples, and the results clearly show the performance degradation due to the lack of topology information. By comparing to previous strategies, the efficiency of our strategy is demonstrated. © 2011 IEEE.

Liu Y.,Dalian University of Technology | Wang Z.,Donghua University | Wang Z.,Brunel University | Wang W.,Dalian University of Technology
Signal Processing | Year: 2011

In this paper, the reliable H∞ filtering problem is investigated for a class of uncertain discrete time-delay systems with randomly occurred nonlinearities (RONs) and sensor failures. RONs are introduced to model a class of sector-like nonlinearities that occur in a probabilistic way according to a Bernoulli distributed white sequence with a known conditional probability. The failures of sensors are quantified by a variable varying in a given interval. The time-varying delay is unknown with given lower and upper bounds. The aim of the addressed reliable H∞ filtering problem is to design a filter such that, for all possible sensor failures, RONs, time-delays as well as admissible parameter uncertainties, the filtering error dynamics is asymptotically mean-square stable and also achieves a prescribed H∞ performance level. Sufficient conditions for the existence of such a filter are obtained by using a new LyapunovKrasovskii functional and delay-partitioning technique. The filter gains are characterized in terms of the solution to a set of linear matrix inequalities (LMIs). A numerical example is given to demonstrate the effectiveness of the proposed design approach. © 2010 Elsevier B.V. All rights reserved.

Zhao B.,University of Shanghai for Science and Technology | Su Y.,Donghua University
Chemical Engineering Research and Design | Year: 2010

In order to build the complex relationships between cyclone pressure drop coefficient (PDC) and geometrical dimensions, representative artificial neural networks (ANNs), including back propagation neural network (BPNN), radial basic functions neural network (RBFNN) and generalized regression neural network (GRNN), are developed and employed to model PDC for cyclone separators. The optimal parameters for ANNs are configured by a dynamically optimized search technique with cross-validation. According to predicted accuracy of PDC, performance of configured ANN models is compared and evaluated. It is found that, all ANN models can successfully produce the approximate results for training sample. Further, the RBFNN provides the higher generalization performance than the BPNN and GRNN as well as the conventional PDC models, with the mean squared error of 5.84×10-4 and CPU time of 120.15s. The result also demonstrates that ANN can offer an alternative technique to model cyclone pressure drop. © 2009 The Institution of Chemical Engineers.

Ge Z.,Donghua University | Ge Z.,Hong Kong Polytechnic University | Hu H.,Hong Kong Polytechnic University | Liu Y.,Hong Kong Polytechnic University
Smart Materials and Structures | Year: 2013

This paper reports the finite element analysis of an innovative 3D auxetic textile structure consisting of three yarn systems (weft, warp and stitch yarns). Different from conventional 3D textile structures, the proposed structure exhibits an auxetic behaviour under compression and can be used as a reinforcement to manufacture auxetic composites. The geometry of the structure is first described. Then a 3D finite element model is established using ANSYS software and validated by the experimental results. The deformation process of the structure at different compression strains is demonstrated, and the validated finite element model is finally used to simulate the auxetic behaviour of the structure with different structural parameters and yarn properties. The results show that the auxetic behaviour of the proposed structure increases with increasing compression strain, and all the structural parameters and yarn properties have significant effects on the auxetic behaviour of the structure. It is expected that the study could provide a better understanding of 3D auxetic textile structures and could promote their application in auxetic composites. © 2013 IOP Publishing Ltd.

He C.,University of Michigan | He C.,Donghua University | Jin X.,University of Michigan | Ma P.X.,University of Michigan
Acta Biomaterialia | Year: 2014

Mineralized nanofibrous scaffolds have been proposed as promising scaffolds for bone regeneration due to their ability to mimic both nanoscale architecture and chemical composition of natural bone extracellular matrix. In this study, a novel electrodeposition method was compared with an extensively explored simulated body fluid (SBF) incubation method in terms of the deposition rate, chemical composition and morphology of calcium phosphate formed on electrospun fibrous thin matrices with a fiber diameter in the range ∼200-1400 nm prepared using 6, 8, 10 and 12 wt.% poly(l-lactic acid) (PLLA) solutions in a mixture of dichloromethane and acetone (2:1 in volume). The effects of the surface modification using the two mineralization techniques on osteoblastic cell (MC3T3-E1) proliferation and differentiation were also examined. It was found that electrodeposition was two to three orders of magnitude faster than the SBF method in mineralizing the fibrous matrices, reducing the mineralization time from ∼2 weeks to 1 h to achieve the same amounts of mineralization. The mineralization rate also varied with the fiber diameter but in opposite directions between the two mineralization methods. As a general trend, the increase of fiber diameter resulted in a faster mineralization rate for the electrodeposition method but a slower mineralization rate for the SBF incubation method. Using the electrodeposition method, one can control the chemical composition and morphology of the calcium phosphate by varying the electric deposition potential and electrolyte temperature to tune the mixture of dicalcium phosphate dihydrate and hydroxyapatite (HAp). Using the SBF method, one can only obtain a low crystallinity HAp. The mineralized electrospun PLLA fibrous matrices from either method similarly facilitate the proliferation and osteogenic differentiation of preosteoblastic MC3T3-E1 cells as compared to neat PLLA matrices. Therefore, the electrodeposition method can be utilized as a fast and versatile technique to fabricate mineralized nanofibrous scaffolds for bone tissue engineering. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Shao C.,Donghua University | Yoshimura K.,Kyushu University
Analytical Sciences | Year: 2011

A method for the on-line absorptiometric determination of trace amounts of boron in steels was developed using an anion-exchange column presorbed with chromotropic acid. The on-line reaction and separation were achieved by controlling the pH in order to accelerate the complex formation in the column by 2.7 and to stabilize the complex at pH 8 for the selective elution of a 1:2 complex and its detection at 350 nm. The effects from the iron matrix in the sample were effectively removed by using EDTA as a masking agent; a low limit for boron detection (3σ) of 0.04 μg g-1 was obtained. © 2011 The Japan Society for Analytical Chemistry.

Liu J.-B.,CAS Shanghai Institute of Organic Chemistry | Xu X.-H.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Organic Letters | Year: 2015

The development of an efficient and practical method for the preparation of alkyl trifluoromethyl ethers is urgently demanding. The silver-mediated oxidative O-trifluoromethylation of primary, secondary, and tertiary alcohols with TMSCF3 under mild reaction conditions is established to provide a novel approach to a broad range of alkyl trifluoromethyl ethers. Further, this method is applied to the late-stage O-trifluoromethylation of complex natural products and prescribed pharmaceutical agents. © 2015 American Chemical Society.

Liu Y.,Dalian University of Technology | Wang Z.,Donghua University | Wang Z.,Brunel University | Wang W.,Dalian University of Technology
Optimal Control Applications and Methods | Year: 2011

This paper is concerned with the reliable control problem against actuator failures for a class of uncertain discrete-time stochastic nonlinear time-delay systems. The failures of actuators are quantified by a variable varying in a given interval. The stochastic nonlinearities described by statistical means cover several well-studied nonlinear functions as special cases. The time-varying delay is unknown with given lower and upper bounds. The multiplicative stochastic disturbances are in the form of a scalar Gaussian white noise with unit variance. Attention is focused on the analysis and design of a stable controller such that, for all possible actuator failures, stochastic nonlinearities and disturbances, time delays and admissible parameter uncertainties, the closed-loop system is exponentially mean-square stable. A linear matrix inequality approach is developed to solve the addressed problem. A numerical example is given to demonstrate the effectiveness of the proposed design approach. Copyright © 2010 John Wiley & Sons, Ltd.

Wu A.-H.,Ludong University | Cao Y.-Y.,Ludong University | Liu B.,Donghua University
Energy Efficiency | Year: 2014

With the development of economy, the impression of energy and environment is increasing, and improving energy efficiency plays a vital role in the sustainable economic development in China. An application of data envelopment analysis (DEA) and Malmquist indices has been used in this paper to investigate energy utilization efficiency of 30 provinces, autonomous regions, and municipalities (apart from Hong Kong, Macau, Taiwan, and Tibet) in China. The results show that industries in the eastern area have the best average energy efficiency for the period 2006-2009, followed by the central area. The industrial energy overall technical efficiency, industrial energy pure technical efficiency, industrial energy scale efficiency, etc. in 30 different regions of China are examined. By the comparative analysis of energy efficiency, the results show that the energy efficiency of Beijing, Shanghai, Jiangsu, Zhejiang, Guangdong, and Hainan provinces is effective, and the lowest six regions of energy efficiency are Ningxia, Inner Mongolia, Shaanxi, Liaoning, Chongqing, and Jilin, whose energy efficiency is in the level of 0.5 or so. The results mean that the eastern regions are better than the central and western regions according to energy efficiency. © 2013 Springer Science+Business Media Dordrecht.

Wang M.,Donghua University | Li F.,Donghua University | Wang M.,National University of Singapore
Neurocomputing | Year: 2012

Building visual models provides an important way to detect visual concepts from images. However, due to the problems of visual diversity and uncertainty, the estimation based on these models is not satisfactory. The visual relatedness among visual models is ignored for most previous methods. In this paper, we propose a novel annotation method which exploits the visual relatedness information among different concepts by collaborative visual modeling. We propose to approximate a given visual model as a convex combination of other reference models. ℓ 1-penalized regularization is used to exploit the sparsity nature underlying the high dimensional model reconstruction space. The relatedness is well represented in the sparse reconstruction coefficients and used to enhance the discriminativeness and robustness of the visual models. We further provide an efficient strategy to learn the coefficients by solving sparse model reconstruction problem. As we know, it is the first effort to deal with this problem. So the proposed method has general significance. The experimental results on benchmark Corel dataset and Flickr dataset demonstrate the effectiveness of the proposed methods. © 2012 Elsevier B.V.

Liang Y.,Fudan University | Liang Y.,Donghua University | Huang J.-P.,Fudan University
Frontiers of Physics | Year: 2013

In our recent papers, we have identified a class of phase transitions in the market-directed resource-allocation game, and found that there exists a critical point at which the phase transitions occur. The critical point is given by a certain resource ratio. Here, by performing computer simulations and theoretical analysis, we report that the critical point is robust against various kinds of human hedge behavior where the numbers of herds and contrarians can be varied widely. This means that the critical point can be independent of the total number of participants composed of normal agents, herds and contrarians, under some conditions. This finding means that the critical points we identified in this complex adaptive system (with adaptive agents) may also be an intensive quantity, similar to those revealed in traditional physical systems (with non-adaptive units). © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg.

Shen C.,Donghua University
Applied Mechanics and Materials | Year: 2014

Subjected to the randomness of motion state, simulated three-dimensional coordinates of the fabric will displace during moving. Mutation in motion state significantly increases the 3D randomness of fabric motion parameters, so that the three-dimensional coordinates of the fabric change in neighborhood leading to non-realistic simulation effect. To solve the problem, the paper proposes a three-dimensional visual fabric simulation algorithm based on feature matching and energy constrained estimation. It adds a certain area constraints to deformation and direction randomness of the fabric in motion in accordance to the estimation of the fabric's characteristic parameter; uses fabric model and characteristic groups to limit the moving scope to realize the true 3D computer simulation for the fabric. Experiments show that the method can realize three-dimensional fabric simulation with high fidelity. © (2014) Trans Tech Publications, Switzerland.

Wu B.H.,Donghua University | Yi W.,Anhui University of Science and Technology | Cao J.C.,CAS Shanghai Institute of Microsystem and Information Technology | Guo G.-C.,Anhui University of Science and Technology
Physical Review B - Condensed Matter and Materials Physics | Year: 2014

We show that noncollinear Andreev reflections can be induced at interfaces of semiconductor nanowires with spin-orbit coupling, Zeeman splitting, and proximity-induced superconductivity. In a noncollinear local Andreev reflection, the spin polarizations of the injected and the retro-reflected carriers are typically at an angle that is tunable via system parameters. While in a nonlocal transport, this noncollinearity enables us to identify and block, at different voltage configurations, the noncollinear cross Andreev reflection and the direct charge transfer processes. We demonstrate that the intriguing noncollinearity originates from the spin-dependent coupling between carriers in the lead and the lowest discrete states in the wire, which, for a topological superconducting nanowire, are related to the overlap-induced hybridization of Majorana edge states in a finite system. These interesting phenomena can be observed in semiconductor nanowires of experimentally relevant lengths, and are potentially useful for spintronics. © 2014 American Physical Society.

Nurwaha D.,Key Laboratory of Science and Technology of Eco Textile | Wang X.,Donghua University
Fibers and Polymers | Year: 2011

A new method for rotor spun yarn prediction from fiber properties based on the theory of support vector machines (SVM) was introduced. The SVM represents a new approach to supervised pattern classification and has been successfully applied to a wide range of pattern recognition problems. In this study, high volume instrument (HVI) and advanced fiber information system (Uster AFIS) fiber test results consisting of different fiber properties are used to predict the rotor spun yarn strength. The results obtained through this study indicated that the SVM method would become a powerful tool for predicting rotor spun yarn strength. The relative importance of each fiber property on the rotor spun yarn strength is also expected. The study shows also that the combination of SVM parameters and optimal search method chosen in the model development played an important role in better performance of the model. The predictive performances are estimated and compared to those provided by ANFIS model. © 2011 The Korean Fiber Society and Springer Netherlands.

Zhao B.,University of Shanghai for Science and Technology | Su Y.,Donghua University
Renewable and Sustainable Energy Reviews | Year: 2014

Global warming caused by anthropogenic CO2 emission has been one of the most important issues in the fields of science, environment and even international economics and politics. To control and reduce CO2 emissions, intensive carbon dioxide capture and storage (CCS) technologies have been comprehensively developed for sequestration of CO2 especially from combustion flue gas. Microalgae-based CO2 biological fixation is regarded as a potential way to not only reduce CO2 emission but also achieve energy utilization of microalgal biomass. However, in this approach culture process of microalgae plays an important role as it is directly related to the mechanism of microalgal-CO2 fixation and characteristics of microalgal biomass production. The aim of this work is to present a state-of-the-art review on the process effect, especially on the effects of photobiochemical process, microalgal species, physicochemical process and hydrodynamic process on the performance of microalgal-CO2 fixation and biomass production. Also, the perspectives are proposed in order to provide a positive reference on developing its fundamental research and key technology. © 2013 Elsevier Ltd.

Sun J.,Donghua University | Wu L.,Heze University
Colloids and Surfaces B: Biointerfaces | Year: 2014

This work proposed a novel approach for protein purification by using double layer mixed matrix membranes (MMMs). The double layer MMMs consisting of an active support and separating layer were prepared by co-casting two polymer solutions onto a glass plate. The active support layer consisted of nano hydroxyapatite (HAP) particles embedded in macroporous polyether sulfone (PES) and the separating layer was particle free PES membrane. The influence of separating layer with different PES content on membrane morphology was studied. The double layer MMMs were further characterized concerning permeability and adsorption capacity. The double layer MMMs showed purification of protein via diffusion as well as adsorption. The bovine serum albumin (BSA) was used as a model protein. The properties and structures of double layer MMMs prepared by immersion phase separation process were characterized by pure water flux, BSA adsorption and scanning electron microscopy (SEM). © 2014 Elsevier B.V.

Carbon fiber reinforced polyimide (CF/PI) composites have been filled with polyethylene-polyamine-treated carbon nanotube to enhance the adhesion. According to the modification, the interlaminar shear strength (ILSS) of composites has been greatly improved. Dynamic wetting method, XPS and SEM are used to examine the microscopic properties of resultant composites. The enhanced ILSS is attributed to the CNT interlock, which improves the wetting between carbon fibers and resins. © Taylor & Francis Group, LLC.

Polyvinylidene fluoride (PVDF) membranes without surface pores were prepared by using water soluble diluents, diethylene glycol monoethyl ether acetate (DCAC), via thermally induced phase separation (TIPS) technique. The effects of PVDF concentration, temperature of coagulant and DCAC concentration in coagulation bath on membrane structures and properties were studied. The antifouling property of membrane with or without surface pores was compared by humic acid (HA) solution and the recovery of DCAC in aqueous solution was investigated. Membranes were characterized by porosity, pure water flux and retention to bovine serum albumin (BSA). Membrane structures were inspected by SEM. The crystal forms of membranes were analyzed by FTIR and XRD. The results show that a compact skin layer and a support layer with spherulitic structure form when DCAC is diluent. Higher polymer concentration and higher coagulation temperature promote the formation of α phase crystal, while higher DCAC concentration in coagulation bath promotes the formation of β phase crystal. Membrane without surface pores has better antifouling property than the membrane with surface pores. Dichloromethane is the best extractant to recover DCAC in DCAC aqueous solution. © 2015 Elsevier Ltd.

Qi J.,Donghua University | Qi J.,University of California at San Diego | Vazquez R.,University of Seville | Krstic M.,University of California at San Diego
IEEE Transactions on Automatic Control | Year: 2015

This paper introduces a methodology for modelling, analysis, and control design of a large-scale system of agents deployed in 3-D space. The agents' communication graph is a mesh-grid disk 2-D topology in polar coordinates. Treating the agents as a continuum, we model the agents' collective dynamics by complex-valued reaction-diffusion 2-D partial differential equations (PDEs) in polar coordinates, whose states represent the position coordinates of the agents. Due to the reaction term in the PDEs, the agents can achieve a rich family of 2-D deployment manifolds in 3-D space which correspond to the PDEs' equilibrium as determined by the boundary conditions. Unfortunately, many of these deployment surfaces are open-loop unstable. To stabilize them, a heretofore open and challenging problem of PDE stabilization by boundary control on a disk has been solved in this paper, using a new class of explicit backstepping kernels that involve the Poisson kernel. A dual observer, which is also explicit, allows to estimate the positions of all the agents, as needed in the leaders' feedback, by only measuring the position of their closest neighbors. Hence, an all-explicit control scheme is found which is distributed in the sense that each agent only needs local information. Closed-loop exponential stability in the L2, H1, and H2 spaces is proved for both full state and output feedback designs. Numerical simulations illustrate the proposed approach for 3-D deployment of discrete agents. © 1963-2012 IEEE.

Tan L.,Shanghai JiaoTong University | Wan A.,Shanghai JiaoTong University | Pan D.,Donghua University
Materials Letters | Year: 2011

A new spinning method - pregelled gel spinning method for polyacrylonitrile (PAN) precursor fiber was reported. The physical and structural properties of the pregelled gel spun PAN precursor fibers as well as dry-jet wet spun PAN precursor fibers were studied. Compared with the dry-jet wet spun fibers, the pregelled gel spun fibers had reduced core-shell difference, circular cross sections and fewer internal pores. The pregelled gel spun fibers were found to have higher crystallinity and larger crystallite size than the dry-jet wet spun fibers. The tensile stress relaxation tests suggested that the pregelled gel spun fibers had higher elasticity and better developed supermolecular structure. © 2010 Elsevier B.V. All rights reserved.

Potts J.R.,University of Texas at Austin | Murali S.,University of Texas at Austin | Zhu Y.,University of Texas at Austin | Zhao X.,Donghua University | And 2 more authors.
Macromolecules | Year: 2011

We present the first report of polymer composites using microwave-exfoliated graphite oxide (MEGO) as filler, a high surface area carbon material that resembles graphene on a local scale. MEGO has a "wormlike" layered structure which can be sheared apart during melt mixing with a polymer host. In this study, we produced MEGO/polycarbonate (PC) composites at various loadings and evaluated their morphology and properties. Transmission electron microscopy and X-ray scattering studies suggested an exfoliated morphology, with wrinkled platelets of approximately 4-5 nm thickness evenly dispersed throughout the PC matrix. Frequency scans of composite melts using shear rheology showed an onset of frequency-independent terminal behavior around 2.1 wt %, suggesting an effective aspect ratio of nearly 50 for the dispersed platelets, in agreement with TEM analysis. The composites showed significant increases in electrical conductivity, with an onset of electrical percolation around 1.3 wt %, but only exhibited modest improvements in thermal conductivity. Long-term thermal annealing was performed to promote disorientation of the dispersed platelets, which further improved the electrical conductivity but had little effect on the thermal conductivity. Dynamic mechanical analysis showed reinforcement by MEGO; however, very little change in the glass transition temperature and in the thermal stability was observed in the composites versus neat PC. © 2011 American Chemical Society.

Zhu F.,Donghua University
International Journal of Thermophysics | Year: 2013

Heat transfer through an expanded polytetrafluorethylene (ePTFE) membrane used in functional clothing is a key process in the design of membrane-based clothing. A fractal model for the thermal conductivity of an ePTFE membrane is demonstrated by considering the specific microstructure within the ePTFE membrane with the "nodes-fibrils" model. The prediction results from the proposed model are compared with calculated values from another theoretical model and are also validated by experimental data. The present model is more suitable for evaluating the effective thermal conductivity of a biaxial stretching PTFE membrane. © 2012 Springer Science+Business Media New York.

Ivlev A.V.,Max Planck Institute for Extraterrestrial Physics | Bartnick J.,Heinrich Heine University Dusseldorf | Heinen M.,Heinrich Heine University Dusseldorf | Heinen M.,California Institute of Technology | And 3 more authors.
Physical Review X | Year: 2015

There is a variety of situations in which Newton's third law is violated. Generally, the action-reaction symmetry can be broken for mesoscopic particles, when their effective interactions are mediated by a nonequilibrium environment. Here, we investigate different classes of nonreciprocal interactions relevant to real experimental situations and present their basic statistical mechanics analysis.We show that in mixtures of particles with such interactions, distinct species acquire distinct kinetic temperatures. In certain cases, the nonreciprocal systems are exactly characterized by a pseudo-Hamiltonian; i.e., being intrinsically nonequilibrium, they can nevertheless be described in terms of equilibrium statistical mechanics. Our results have profound implications, in particular, demonstrating the possibility to generate extreme temperature gradients on the particle scale. We verify the principal theoretical predictions in experimental tests performed with two-dimensional binary complex plasmas.

Zhao B.,University of Shanghai for Science and Technology | Su Y.,Donghua University | Peng Y.,University of Shanghai for Science and Technology
International Journal of Greenhouse Gas Control | Year: 2013

Capture of carbon dioxide (CO2) from combustion flue gas by aqueous ammonia has been demonstrated as an effective and promising technology. To examine the effect of reactor geometry on ammonia-based CO2 capture performance, a series of bubble column reactors with same volume of working liquid but varied geometry (liquid height-to-diameter ratios H/D=0.93, 2.04 and 3.98) were designed to investigate CO2 capture efficiency with ammonia under different reaction conditions. It is found that reactor geometry characterized by liquid height-to-diameter ratio plays an important role in CO2 capture efficiency as it is associated with gas holdup time in reactors. CO2 capture efficiency increases as liquid height-to-diameter ratio increases. Under the same experimental conditions, the maximum CO2 capture efficiency can increase by up to 7%. Besides, CO2 capture efficiency has positive correlation with the ammonia concentration and reaction temperature whereas has negative correlation with the CO2 inlet concentration and flue gas flowrate. © 2013 Elsevier Ltd.

Hu J.,Zhejiang Ocean University | Li N.,Donghua University | Liu X.,Nanjing University of Science and Technology | Zhang G.,Nanjing University of Science and Technology
Nonlinear Dynamics | Year: 2013

This paper is concerned with the sampled-data state estimation problem for a class of delayed neural networks with Markovian jumping parameters. Unlike the classical state estimation problem, in our state estimation scheme, the sampled measurements are adopted to estimate the concerned neuron states. The neural network under consideration is assumed to have multiple modes that switch from one to another according to a given Markovian chain. By utilizing the input delay approach, the sampling period is converted into a time-varying yet bounded delay. Then a sufficient condition is given under which the resulting error dynamics of the neural networks is exponentially stable in the mean square. Based on that, a set of sampled-data estimators is designed in terms of the solution to a set of linear matrix inequalities (LMIs) which can be solved by using the available software. Finally, a numerical example is used to show the effectiveness of the estimation approach proposed in this paper. © 2013 Springer Science+Business Media Dordrecht.

Xu Y.,Yunyang Teachers College | Yang H.,China Three Gorges University | Tong D.,Donghua University | Wang Y.,South-Central University for Nationalities
Nonlinear Dynamics | Year: 2013

In this paper, the analysis problem of adaptive exponential synchronization in pth moment is considered for stochastic complex networks with time varying multi-delayed coupling. By using the Lyapunov-Krasovskii functional, stochastic analysis theory, several sufficient conditions to ensure the mode adaptive exponential synchronization in pth moment for stochastic delayed complex networks are derived. To illustrate the effectiveness of the synchronization conditions derived in this paper, a numerical example is finally provided. © 2013 Springer Science+Business Media Dordrecht.

Yang R.,Tongji University | Peng Y.,Donghua University | Song Y.,Tongji University
Nonlinear Dynamics | Year: 2013

In this paper, we investigate the dynamics of the inverted pendulum with delayed feedback control. The existence and stability of multiple equilibria depending on the control strengths are studied. Taking the time delay of the control terms as a parameter, periodic oscillations induced by delay are found. By using the method of multiple scales, the effect of the control gains and the relative mass of the pendulum on the stability and direction of Hopf bifurcations are discussed. Numerical simulations are employed to illustrate the obtained theoretical results. © 2013 Springer Science+Business Media Dordrecht.

Yang X.,Donghua University
Wei sheng wu xue bao = Acta microbiologica Sinica | Year: 2010

OBJECTIVE: Bezafibrate is one of the most frequently detected pharmaceuticals at relatively high concentration in surface water and even in drinking water. Biodegradation is an important way to solve the problem. This study aimed to isolate, identify and characterize a bezafibrate-degrading bacterium. METHODS: Strain B31 capable of degrading bezafibrate by cometabolism was isolated from activated sludge of sewage treatment plant in Shanghai, China, and identified based on its morphology, physiology and phylogenetic analysis of 16S rRNA sequence. To evaluate the ability of degradation, the concentration of bezafibrate was detected by high performance liquid chromatography. RESULTS: Strain B31 was identified to be closely related to Pseudomonas putida. The optimum condition of degrading bezafibrate was at 30 degrees C, pH 7. After 5 days, Strain B31 could degrade 30 mg/L bezafibrate by 48% in liquid mineral salt medium with 1% methanol as primary substrate. And the rate of degradation could enhance to 61%, 72.6%, 76.67%, when 5 g/L glucose, peptone and yeast extract as primary substrate, respectively. CONCLUSION: The strain has the potential for bezafibrate biodegradation.

Feng Y.,Max Planck Institute for Plasma Physics (Garching) | Lunt T.,Max Planck Institute for Plasma Physics (Garching) | Sardei F.,Max Planck Institute for Plasma Physics (Garching) | Zha X.,Donghua University
Computer Physics Communications | Year: 2013

The paper presents a numerical technique for modeling "trace" impurity transport in the scrape-off-layer (SOL) and core regions by implicit coupling of a three-dimensional (3D) edge Monte Carlo code like EMC3-Eirene Feng et al. (2004) [4], Reiter et al. (2005) [6] to a one-dimensional (1D) core model handled by a finite difference method. For given core plasma and transport coefficient profiles, certain types of particular solutions to the 1D model are pre-calculated under specific boundary conditions at the SOL-core interface. Linear combination of these solutions yields a general solution, which is then translated into "Monte Carlo language" by formulating a so-called "charge state transition probability" matrix. This matrix provides definitive boundary conditions at the SOL-core interface so that a self-consistent solution for both SOL and core is achievable without the need for SOL-core iteration. © 2013 Elsevier B.V. All rights reserved.

Chung S.,North Carolina State University | Ingle N.P.,North Carolina State University | Montero G.A.,North Carolina State University | Kim S.H.,Korea Institute of Science and Technology | And 2 more authors.
Acta Biomaterialia | Year: 2010

Current surgical therapy for diseased vessels less than 6 mm in diameter involves bypass grafting with autologous arteries or veins. Although this surgical practice is common, it has significant limitations and complications, such as occlusion, intimal hyperplasia and compliance mismatch. As a result, cardiovascular biomaterials research has been motivated to develop tissue-engineered blood vessel substitutes. In this study, vascular tissue engineering scaffolds were fabricated using two different approaches, namely melt spinning and electrospinning. Small diameter tubes were fabricated from an elastomeric bioresorbable 50:50 poly(L-lactide-co-ε-caprolactone) copolymer having dimensions of 5 mm in diameter and porosity of over 75%. Scaffolds electrospun from two different solvents, acetone and 1,1,1,3,3,3-hexafluoro-2- propanol were compared in terms of their morphology, mechanical properties and cell viability. Overall, the mechanical properties of the prototype tubes exceeded the transverse tensile values of natural arteries of similar caliber. In addition to spinning the polymer separately into melt-spun and electrospun constructs, the approach in this study has successfully demonstrated that these two techniques can be combined to produce double-layered tubular scaffolds containing both melt-spun macrofibers (<200 μm in diameter) and electrospun submicron fibers (>400 nm in diameter). Since the vascular wall has a complex multilayered architecture and unique mechanical properties, there remain several significant challenges before a successful tissue-engineered artery is achieved. © 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.

Wong W.K.,Hong Kong Polytechnic University | Leung S.Y.S.,Hong Kong Polytechnic University | Guo Z.X.,Hong Kong Polytechnic University | Zeng X.H.,Donghua University | Mok P.Y.,Hong Kong Polytechnic University
International Journal of Production Economics | Year: 2012

This paper presents a combined use of both RFID technology and product cross-selling system to perform cross- and up-selling for retail industry. In this study, two systems, namely the Smart Dressing System (SDS) enabled by RFID technologies, and Intelligent Product Cross-selling System (IPCS), have been developed. The SDS demonstrates a research endeavor in which, unlike the previous studies focusing on transactional data, customers in-store data can be collected using RFID-enabled SDS and used for promoting or cross-selling new products to the customers effectively and efficiently. The IPCS, integrating a rule-based expert system and a fuzzy screening technique, can handle the difficulty of processing linguistic and categorical information to simulate fashion designers to recommend appropriate fashion product items for cross-selling effectively. The proposed systems are evaluated to execute the selling strategies more effectively, which in turn improve sales performance in fashion retail industry. © 2010 Elsevier B.V. All rights reserved.

Dong M.,Shanghai JiaoTong University | Yang D.,Donghua University | Su L.,Shanghai JiaoTong University
Expert Systems with Applications | Year: 2011

With the development of mass customization (MC) paradigm, service product/package configuration is getting crucial to service industry. Aiming to extend the achievements of product configuration in manufacturing industry to service industry and considering ontology's reusability, an ontology-based service product modeling approach for configuration is presented in this paper. Firstly, service variants of service products are represented through the feature modeling approach. Then, the feature-based service model is formalized in OWL (Ontology Web language) - an ontology language for semantic web, and configuration rules are formalized in SWRL (Semantic Web Rule Language) - a rule language. Configuration reasoning processes are performed with the support of JESS (Java Expert System Shell) rule engine. Finally, the proposed approach to service customization is demonstrated by an example of configuring service packages for China Mobile. © 2011 Elsevier Ltd. All rights reserved.

Zhang W.,Yangzhou University | Tang Y.,Humboldt University of Berlin | Wu X.,Anhui Polytechnic University | Fang J.-A.,Donghua University
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2014

In this paper, the synchronization problem is investigated for a class of nonlinear delayed dynamical networks with heterogeneous impulsive effects. The intrinsic properties of heterogeneous impulses are that impulsive strengths are inhomogeneous in both time and space domains, i.e., the impulsive effect in each node is not only nonidentical from each other, but also time-varying at different impulsive instants. The purpose of the addressed problem is to derive synchronization criteria such that, the nonlinear delayed dynamical networks with heterogeneous impulses can be synchronized to a desired state. By means of a time-dependent Lyapunov function and the comparison principle, several sufficient conditions are established under which nonlinear dynamical networks with heterogeneous impulsive effects are exponentially synchronized to a desired state. An example is given to show the effectiveness of the proposed results. © 2004-2012 IEEE.

Wong W.K.,Hong Kong Polytechnic University | Wang Z.,Donghua University | Zhen B.,Hong Kong Polytechnic University | Leung S.Y.S.,Hong Kong Polytechnic University
International Journal of Neural Systems | Year: 2012

The purpose of this paper is to identify situations in neural network modeling where current-based synapses are applicable. The applicability of current-based synapse model for studying post-transient behavior of neural networks is discussed in terms of average synaptic current strength induced by per spike during one firing cycle of a neuron (or briefly per spike synaptic current strength). It was found that current-based synapse models are applicable in both situations where both the interspike intervals of the neurons and the distribution of firing times of the neurons are uniform, and where the firing of all neurons is synchronized. If neither the interspike intervals nor the distribution of firing times of the neurons is uniform or the reversal potential is between the rest and threshold potentials, current-based synapse models may be oversimplified. © 2012 World Scientific Publishing Company.

Zou Z.,Shaoxing University | Zou Z.,Donghua University
Fibres and Textiles in Eastern Europe | Year: 2012

The structure of vortex spun yarn made by the Murata vortex spinning machine is differentfrom that of other yarns, such as ring spun yarn, air-jet spun yarn and so on. The stressrelaxation model is constructed by a generalized Maxwell model connected in a row to aHook's spring in order to predict and analyse the stress relaxation property of vortex spunyarn. Based on the stress relaxation model, the stress relaxation properties of vortex spunyarn, ring spun yarn and air-jet spun yarn are compared and analysed. The factors influencingthe stress relaxation property of vortex spun yarn, such as the tensile strain, tensilerate and yarn count are discussed. The research results show that the stress relaxationmodel can be used for describing the stress relaxation mechanism of vortex spun yarn. Theelasticity of vortex spun yarn is better than that of air-jet spun yarn, but worse than that ofring spun yarn. When the tensile strain is lower and the tensile rate is larger, vortex spunyarn has a more obvious stress relaxation phenomenon. The stress relaxation phenomenonof finer yarn is more obvious than that of coarser yarn.

Xu H.,University of Nebraska - Lincoln | Yang Y.,University of Nebraska - Lincoln | Yang Y.,Donghua University
ACS Sustainable Chemistry and Engineering | Year: 2014

Pure protein fibers were fabricated from chicken feathers via a potentially green process. In the last several decades, efforts have been made to produce keratin-based industrial products, especially fibers. However, the methods of producing keratin fibers directly from chicken feathers could not be repeated. In this research, protein fibers from chicken feathers were developed using chemicals that could be either derived from renewable resources or facilely recycled. Backbones of keratin were preserved after cleavage of disulfide bonds using cysteine. Sodium dodecyl sulfate (SDS) was applied to dissolve keratin for spinning. Increasing SDS concentration intensified the ordered conformation of keratin, first increased and then decreased the viscosity of solution, suggesting continuous disentanglement of keratin molecules and enhancement in inter- and intramolecular electrical repulsion. Diameters of the obtained fibers as small as 20 μm also proved good drawability of the keratin solution. Change in crystallinity indices was found to be consistent with that of tensile properties of the keratin fibers. In summary, regenerated fibers were successfully produced as linear keratin with preserved backbones that could be untangled and aligned in a controlled manner. © 2014 American Chemical Society.

Zhao B.,University of Shanghai for Science and Technology | Su Y.,Donghua University | Tao W.,University of Shanghai for Science and Technology
Applied Energy | Year: 2014

Rotating packed beds have been demonstrated to be able to intensify the physicochemical process of multiphase transportation and reaction in the fields of energy and environment, and successfully applied in the field of CO2 emission control. However, modeling and prediction of gas-liquid mass transfer especially for mass transfer with chemical reaction are rare due to the complexity of multiphase fluid flow and transportation. In view of the inaccuracy of semi-empirical models and the complexity of computational fluid dynamics models, an intelligent correlation model was developed in this work to predict the mass transfer coefficient more accurately for CO2 capture with NaOH solution in different type rotating packed beds. This model used dimensional analysis to determine the independent variables affecting the mass transfer coefficients, and then used least squares support vector regression (LSSVR) for prediction. An optimized radial basis function was obtained as kernel function based on grid search coupled with simulated annealing (SA) and 10-fold cross-validation (CV) algorithms. The proposed model had the mean square error of 0.0016 for training set and 0.0012 for testing set. Compared with the models based on multiple nonlinear regression (MNR) and artificial neural network (ANN), the present model decreased mean squared error by 91.06% and 38.46% for training set and 94.57% and 53.85% for testing set respectively, suggesting it had superior performance on prediction accuracy and generalization ability. © 2014 Elsevier Ltd.

Yu Y.-S.,Shanghai University | Zheng H.,Donghua University
Molecular and Cellular Biochemistry | Year: 2012

In hypertensive animals and patients, oxidative stress represents the primary risk factor for progression of left ventricular hypertrophy. Recently, it has been demonstrated that hydrogen, as a novel antioxidant, can selectively reduce hydroxyl radicals and peroxynitrite anion to exert therapeutic antioxidant activity. In the current study, we explored the effect of chronic treatment with hydrogen-rich saline (HRS) on left ventricular hypertrophy in spontaneously hypertensive rats (SHR). The 8-week-old male SHR and age-matched Wistar-Kyoto rats (WKY) were randomized into HRS-treated (6 ml/kg/day for 3 months, i.p.) and vehicle-treated groups. HRS treatment had no significant effect on blood pressure, but it effectively attenuated left ventricular hypertrophy in SHR. HRS treatment abated oxidative stress, restored the activity of antioxidant enzymes including GPx, GST, catalase, and SOD, suppressed NADPH oxidase activity and downregulated Nox2 and Nox4 expression in left ventricles of SHR. HRS treatment suppressed pro-inflammatory cytokines including IL-1β, IL-6, TNF-α, and MCP-1, and inhibited NF-κB activation through preventing IκBα degradation in left ventricles of SHR. HRS treatment preserved mitochondrial function through restoring electron transport chain enzyme activity, repressing ROS formation, and enhancing ATP production in left ventricles of SHR. Moreover, HRS treatment suppressed ACE expression and locally reduced angiotensin II generation in left ventricles of SHR. In conclusion, HRS treatment attenuates left ventricular hypertrophy through abating oxidative stress, suppressing inflammatory process, preserving mitochondrial function, in which suppression of HRS on angiotensin II in left ventricles locally might be involved. © 2012 Springer Science+Business Media, LLC.

Rong Z.,University of Electronic Science and Technology of China | Rong Z.,Donghua University | Wu Z.-X.,Lanzhou University | Chen G.,City University of Hong Kong
EPL | Year: 2013

In this paper, we investigate a networked prisoner's dilemma game where individuals' strategy-selection time scale evolves based on their historical learning information. We show that the more times the current strategy of an individual is learnt by his neighbors, the longer time he will stick on the successful behavior by adaptively adjusting the lifetime of the adopted strategy. Through characterizing the extent of success of the individuals with normalized payoffs, we show that properly using the learned information can form a positive feedback mechanism between cooperative behavior and its lifetime, which can boost cooperation on square lattices and scale-free networks. © Copyright EPLA, 2013.

Yu D.-G.,University of Shanghai for Science and Technology | Branford-White C.,London Metropolitan University | Williams G.R.,London Metropolitan University | Bligh S.W.A.,London Metropolitan University | And 3 more authors.
Soft Matter | Year: 2011

Amphiphilic nanofibers composed of the hydrophilic polymer polyvinylpyrrolidone K60 (PVP) and soybean lecithin were fabricated using an electrospinning process. As a result of the templating and confinement properties of the nanofibers, phosphatidyl choline (PC) liposomes were spontaneously formed through molecular self-assembly when the fibers were added to water. The sizes of the self-assembled liposomes could be manipulated by varying the content of PC in the nanofibers (over the range 9.1-33.3% (w/w) in the present study). The influence of PC on nanofiber formation, and a possible mechanism of templated liposome formation are discussed. This facile and convenient strategy for manipulating molecular self-assembly to synthesize liposomes provides a versatile new approach for the development of novel drug delivery systems and biomaterials. © 2011 The Royal Society of Chemistry.

He J.-H.,Soochow University of China | He J.-H.,Donghua University
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences | Year: 2011

The semi-inverse method is used to establish a variational principle for the Dirichlet boundaryvalue problem with impulses. All the boundary conditions can be obtained as natural conditions bymaking the variational principle stationary. © 2011 Verlag der Zeitschrift für Naturforschung, Tübingen.

Fei S.-W.,Donghua University
International Journal of Electrical Power and Energy Systems | Year: 2016

In this paper, the hybrid model of empirical mode decomposition and multiple-kernel relevance vector regression algorithm (EMD-MkRVR) is presented for wind speed prediction. The multiple-kernel relevance vector regression (MkRVR) model includes radial basis function (RBF) kernel and polynomial kernel whose proportions are determined by a controlled parameter. Grid method is used to select the kernel parameters and controlled parameter in this study. In addition, wind speed can be regarded as a signal and decomposed into several intrinsic mode functions (IMFs) with different frequency range by empirical mode decomposition (EMD), the prediction models of these decomposed signals can be established by MkRVR with their respective appropriate embedding dimension. The experimental results show that the EMD-MkRVR model has a better prediction ability for wind speed than the RBF kernel RVR (RBFRVR) model and the polynomial kernel RVR (PolyRVR) model. © 2015 Elsevier Ltd. All rights reserved.

Li C.-H.,Donghua University | Li C.-H.,Dezhou University | He J.-X.,Key Laboratory of Textile Science and Technology
Journal of Cleaner Production | Year: 2013

In this research, a facile process combined chitosan adsorption and UV-Fenton advanced oxidation process (CAAOP) has been developed for the treatment and reuse of spent acid dyebaths. The acid dyes in the spent dyebaths are completely removed through the adsorption column filled with chitosan, while most of sodium sulphate and Peregal O-25 (nonionic organic surfactant) can pass through the adsorption column with the water. Although the resulting recycled spent acid dyebaths are reused over ten times as new dyebaths for dyeing with C.I. Acid Red 1, the changes of the color differences and the relative unlevelness properties on dyed fabrics are still remained within the acceptable levels. That is also true for the other shade dye, namely C.I. Acid Yellow 11, in the 11th recycling cycle. As a result, an average saving of 87.4%, 91.7% and 50.1% for water, sodium sulphate and Peregal O-25, respectively, is achieved with the reuse process for the total eleven dyebaths. The exhausted chitosan can be easily recovered by dilute alkali as a desorbing agent, and the emissions from the two eluted concentrates treated with UV-Fenton are found to meet the most stringent emission standards for both COD and color in China. Results reveal that CAAOP is a promising process for the treatment and reuse of textile dyeing wastewaters, which can benefit the environment and reduce the operating cost. © 2013 Elsevier Ltd. All rights reserved.

Li X.-G.,Tongji University | Li A.,Tongji University | Li A.,University of California at Los Angeles | Huang M.-R.,Tongji University | And 3 more authors.
Journal of Physical Chemistry C | Year: 2010

Pure polypyrrole (PPy) nanoparticles that are well-applicable for nanocomposite and nanocarbon precursor were productively synthesized by necessarily unstirred oxidative polymerization of pyrrole in acidic aqueous media at 0 °C without any template. The species and concentration of acid and oxidant have been carefully investigated to optimize the polymerization yield, conjugated structure, size, and conductivity of the PPy particles. Laser particle-size analysis, field-emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy all revealed that the PPy particles produced in still acid media have narrow size distribution and uniform spheroid morphology. Homogeneous nucleation and static repulsion are proposed as the formation and self-stabilization mechanisms of the PPy nanoparticles. Combination of HNO3 medium and (NH4) 2S2O8 oxidant is optimal for the synthesis of PPy nanoparticles possessing maximal yield of 87.2%, small diameter, and high conductivity which has been confirmed by a strong UV-vis band due to a large π-conjugated chain structure. This quiescent polymerization could be simply scaled up or down to synthesize a larger or smaller amount of PPy nanoparticles without compromising their yield, structure, and properties. Furthermore, the conductivity of the nano-PPy could reach 2.8 S/cm upon doping in 2.0 M HClO 4. Simultaneous thermogravimetry-differential thermal analysis technique demonstrates that the PPy nanoparticles at 1000 °C can be efficiently carbonized into carbon nanoparticles with narrower size distribution, smaller diameter of 62 nm, and much higher conductivity of about 21 S/cm. In particular, the conductivity will dramatically be enhanced to 219 S/cm and even 370 S/cm at the carbonization and graphitization temperatures of 1300 and 2300 °C in nitrogen and argon, respectively. A conductive nano-PPy/cellulose diacetate nanocomposite film with low percolation threshold down to 0.2 wt %, good conductivity stability for at least 8 weeks, and potential bioapplicability was simply fabricated. The present synthesis requires no external templates and provides a facile and direct route to scalable synthesis of PPy exclusive nanoparticles with high yield, controllable size, strong re-dispersibility, high purity, adjustable conductivity, and high nanocarbon yield. © 2010 American Chemical Society.

Yang B.,CAS Shanghai Institute of Organic Chemistry | Xu X.-H.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Organic Letters | Year: 2015

An efficient chemoselective 1,2-bis(trifluoromethylation) of alkenes with CF3SO2Na promoted by t-BuOOH/CuCl was developed. This protocol provided the first convenient preparation of 1,2-bis(trifluoromethylated) compounds by the vicinal difunctionalization of alkenes. The chemoselectivity of this reaction was accomplished by increasing the concentration of the CF3 radical. © 2015 American Chemical Society.

Hu J.,Harbin Institute of Technology | Hu J.,Harbin University of Science and Technology | Wang Z.,Harbin University of Science and Technology | Wang Z.,Tsinghua University | And 3 more authors.
IEEE Transactions on Signal Processing | Year: 2013

This paper is concerned with the gain-constrained recursive filtering problem for a class of time-varying nonlinear stochastic systems with probabilistic sensor delays and correlated noises. The stochastic nonlinearities are described by statistical means that cover the multiplicative stochastic disturbances as a special case. The phenomenon of probabilistic sensor delays is modeled by introducing a diagonal matrix composed of Bernoulli distributed random variables taking values of 1 or 0, which means that the sensors may experience randomly occurring delays with individual delay characteristics. The process noise is finite-step autocorrelated. The purpose of the addressed gain-constrained filtering problem is to design a filter such that, for all probabilistic sensor delays, stochastic nonlinearities, gain constraint as well as correlated noises, the cost function concerning the filtering error is minimized at each sampling instant, where the filter gain satisfies a certain equality constraint. A new recursive filtering algorithm is developed that ensures both the local optimality and the unbiasedness of the designed filter at each sampling instant which achieving the pre-specified filter gain constraint. A simulation example is provided to illustrate the effectiveness of the proposed filter design approach. © 1991-2012 IEEE.

Chu L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Organic Letters | Year: 2012

An efficient C(sp 3)-CF 3 bond-forming reaction via Cu-catalyzed oxidative trifluoromethylation of terminal alkenes has been developed, which proceeds under mild conditions using readily available, less expensive CF 3SiMe 3 as the source of the CF 3 group. This method allows access to a variety of trifluoromethylated allylic compounds. © 2012 American Chemical Society.

The existence of fixed point in self-similar Lennard-Jones (L-J) potentials has been proved based on the mosaic geometric structure theory of glass transition (GT) [J. L. Wu, Soft Nanoscience letters, 1, 3, 86 (2011)]. A geometric local-global modecoupling recursive equation, different from the current Mode-Coupling Theories, has been introduced to find out the non-integrable induced potential structure of boson peak at GT. The recursively defined variable in reduced recursive equation is the potential fluctuation of reduced L-J potentials associated with reduced geometric phase potentials. A series of results have been deduced directly at GT. (i) There are only 8 orders of molecule-clusters. (ii) Two orthogonally fast-slow reduced phase potentials, 3/8 and 5/8, are accompanied with density fluctuation and clusters hop-delocalization along 8 geodesics. (iii) The stability condition of potential fluctuation is the Lindemann ratio. (iv) A new reduced attractive potential of -17/16, lower than reduced potential well energy -1, occurs. Copyright © 2012 Author(s).

Mo X.,Donghua University | Iwata H.,Kyoto University | Ikada Y.,Nara Medical University
Journal of Biomedical Materials Research - Part A | Year: 2010

In this study, three kinds of two-component adhesive glues were prepared, namely, gel-dext glue made from modified gelatin and dextran, gel-HES glue made from modified gelatin and hydroxyethyl starch (HES), and chit-dext glue made from chitosan and modified dextran. Upon mixing the two-component solution together crosslinking occurred and a gel formed in several seconds, which would seal the wound tissue and stop the bleeding. The adhesive ability of those three prepared glues was evaluated in vitro and in vivo separately by measuring the bonding strength to two piece of porcine skin and the adhesive strength after sealing the skin incisions on the back of rat. Fibrin glue was used as comparing. Gel-dext glue and gel-HES glue shown higher bonding strength and adhesive strength than chit-dext glue and fibrin glue. Histology test of incision tissues given by both HE and MTC methods, the former shown that gel-dext and gel-HES glues, like fibrin glue, have only normal initial inflammation to skin tissue, which almost disappear from 9 days but chit-dext glue seams have heaver inflammation, which may last to 12 days; the later shown gel-dext and gel-HES glues similar to fibrin glue, can heal the wound fast than that of chit-dext glue. The hemostatic ability for gel-HES glue was also tested on a cut liver of rat, which depend on the gel formation speed when the two-composite solutions were mixed together. © 2010 Wiley Periodicals, Inc.

Zhang W.,Donghua University | Tang Y.,Harbin Institute of Technology | Fang J.,Humboldt University of Berlin | Zhu W.,Potsdam Institute for Climate Impact Research
Chaos | Year: 2011

This paper investigates the problem of the exponential cluster synchronization of coupled impulsive genetic oscillators with external disturbances and communication delay. Based on the Kronecker product, some new cluster synchronization criteria for coupled impulsive genetic oscillators with attenuation level are derived. The derived results are related to the impulsive strength, and the derived results also indicate that the maximal allowable bound of time delay is inversely proportional to the decay rate, the decay rate is proportional to the couple strength, the maximal allowable bound of time delay is proportional to attenuation level, and the attenuation level is inversely proportional to the couple strength. Moreover, the case when the feedback have different self-delay is also investigated. Finally, numerical examples are given to illustrate the effectiveness of the derived results. © 2011 American Institute of Physics.

Chen C.,CAS Shanghai Institute of Organic Chemistry | Xie Y.,CAS Shanghai Institute of Organic Chemistry | Chu L.,CAS Shanghai Institute of Organic Chemistry | Wang R.-W.,CAS Shanghai Institute of Organic Chemistry | And 3 more authors.
Angewandte Chemie - International Edition | Year: 2012

Fluorinated functionality: The copper-catalyzed oxidative trifluoromethylthiolation of aryl boronic acids with TMSCF 3 and elemental sulfur at room temperature is described for the first time. This reaction provides a concise and efficient method for the synthesis of aryl trifluoromethyl thioethers (ArSCF 3) under mild conditions. Phen=Phenanthroline. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Huang Y.,Donghua University | Zhang Y.,University of Idaho | Shreeve J.M.,University of Idaho
Chemistry - A European Journal | Year: 2011

Highly dense nitrogen-rich ionic compounds are potential high-performance energetic materials for use in military and industrial venues. Guanazinium salts with promising energetic anions and a family of energetic salts based on nitrogen-rich cations and the 6-nitroamino-2,4-diazido[1,3,5]triazine anion (NADAT) were prepared and fully characterized by elemental analysis, IR spectroscopy, 1Ha NMR and 13Ca NMR spectroscopy, and differential scanning calorimetry (DSC). The crystal structures of neutral NADAT (2) and its biguanidinium salt 5 were determined by single-crystal X-ray diffraction (2: orthorhombic, Pnma; 5: monoclinic, P21). Additionally, the isomerization behavior of 2 in solution was investigated by proton-decoupled 13C and 15N NMR spectroscopy. All the new salts exhibit desirable physical properties, such as relatively high densities (1.63-1.78a ga cm-3) and moderate thermal stabilities (Td = 130-196°C for 3-10 and 209-257°C for 11-15). Theoretical performance calculations (Gaussiana 03 and Cheetaha 5.0) gave detonation pressures and velocities for the ionic compounds 3-15 in the range of 21.0-30.3a GPa and 7675-9048a ma s-1, respectively, which makes them competitive energetic materials. Bang boom bang: Nitrogen-rich salts based on nitroamino-diazido-s-triazine and guanazine exhibit high density, good thermal stabilities, and positive calculated heats of formation (see scheme). Predicted detonation pressures (21.0-30.3a GPa) and detonation velocities (7675-9048a ma s-1) suggest that these salts have potential as insensitive energetic materials. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Cai G.M.,Wuhan Textile University | Yu W.D.,Wuhan Textile University | Yu W.D.,Donghua University
Journal of Thermal Analysis and Calorimetry | Year: 2011

The thermal degradation behaviors of Kevlar 49, Kevlar 129 (Poly(p-phenylene terephthamide), Nomex (polyisophthaloyl metaphenylene diamine), and PBO (poly(p-phenylene benzobisoxazole)) fibers were measured by TG/FTIR and Py-GC/MS. The characteristic temperatures of the fibers in air were obtained by TG. It indicated that the initial degradation temperature of the PBO is the highest. The initial degradation temperature of Nomex fiber is the lowest, but the end decomposition temperature of Nomex is the highest. The gases released by the pyrolysis in air were mainly CO2, CO, H 2O, NO, and HCN, also containing a small amount of NH3, and the absorption peaks of CO2 were the strongest. The results of Py-GC/MS showed that CO2 and benzene were the most pyrolysis fragment. With the change of pyrolysis temperature, the chromatogram and mass spectra results take a large variety. The pyrolysates can help us to study the pyrolysis process of high performance fibers. © 2011 Akadémiai Kiadó, Budapest, Hungary.

He Q.,Donghua University
2010 International Conference on Networking and Digital Society, ICNDS 2010 | Year: 2010

Next generation wireless communications will integrate multiple wireless access networks, including Wireless Wide Area Network (WWAN) and Wireless Local Area Network (WLAN). Vertical handoff decision plays an important role in heterogeneous networks. In this paper, we propose a fuzzy logic based vertical handoff decision algorithm (VHDA) to provide ubiquitous access at any time. Our proposed algorithm considers received signal strength (RSS), available network bandwidth (B), monetary cost (C) and user preference (P) as the vertical handoff decision criteria. The proposed VHDA uses the fuzzy logic method to evaluate the performance of the available networks. Then handoff decisions are made to select the most appropriate network for the mobile nodes (MNs). Simulation results show that fuzzy logic based VHDA is able to make accurate handoff decisions, reduce unnecessary handoffs and decrease the probability of call blocking and dropping. ©2010 IEEE.

Cao Z.J.,Donghua University
Environmental science and pollution research international | Year: 2011

Feathers are one of the most abundant bioresources. They are discarded as waste in most cases and could cause environmental pollution. On the other hand, keratin constituted by amino acids is the main component of feathers. In this article, we reported on biorefined feathers and integrants and application of degraded products. The fermentation of whole chicken feathers with Stenotrophomonas maltophilia DHHJ in a scale-up of a 5-L bioreactor was investigated in this article. The fermentation process was controlled at 0.08 MPa pressure, 2.5 L/min airflow, and 300 rpm as 100% oxygen saturation level, 40°C, and pH 7.8. Feathers were almost completely degraded in the tested fermentation reaction with the following conditions: 80 g of whole feathers in 3 L fermentation broth for 72 h, seed age of 16 h, 100 mL inoculation amount, and 50% oxygen saturation level. The degraded products contain 397.1 mg/L soluble protein that has mass weight ranging from 10 to 160 kD, 336.9 mg/L amino acids, and many kinds of metal ions. The fermentation broth was evaluated as leaf fertilizer and found to increase plant growth to 82% or 66% for two- or fourfold dilutions, respectively. In addition, in a hair care assay, the broth showed a hair protective function by increasing weight, flexibility, and strength of the treated hair. The whole feathers were degraded completely by S. maltophilia DHHJ. The degraded product includes many factors to life, such as peptides, amino acids, and mineral elements. It could be applied as leaf fertilizer and hair care product.

Chen F.,CAS Shanghai Institute of Organic Chemistry | Feng Z.,CAS Shanghai Institute of Organic Chemistry | He C.-Y.,Donghua University | Wang H.-Y.,CAS Shanghai Institute of Organic Chemistry | And 2 more authors.
Organic Letters | Year: 2012

The first example of intermolecular regioselective α-arylation of heteroatom-substituted enones with polyfluoroarenes via twofold C-H bond functionalization using a palladium catalyst is reported. This approach provides rapid access to a wide range of α-fluoroarylated enones of interest in life science. © 2012 American Chemical Society.

Chen J.,Donghua University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

The phase (also called polarity) selection strategy is an important component of a SAT solver based on conflict-driven DPLL. DPLL algorithm is due to Davis, Putnam, Logemann, Loveland. It is a complete, backtracking-based search algorithm for deciding the satisfiability of propositional logic formulae. This paper studies the phase selection strategy and presents a new phase selection strategy, called bit-encoding scheme. The basic idea of this new strategy is to let the phase at each decision level correspond to a bit value of the binary representation of a counter. The counter increases in step with the increase of the number of restarts. In general, only the first 6 decision levels use this new scheme. The other levels use an existing scheme. Compared with the existing strategies, the new strategy is simple, and its cost is low. Experimental results show that the performance of the new phase strategy is good, and the new solver Glue-bit based on it can improve Glucose 2.1 which won a Gold Medal for application category at the SAT Challenge 2012. Furthermore, Glue-bit solved a few application instances that were not solved in the SAT Challenge 2012. From the results on the application SAT+UNSAT category at the SAT Competition 2013, Glue-bit was the best improved version of Glucose, and outperformed glucose 2.3 that is the latest improved version of glucose 2.1. © 2014 Springer International Publishing Switzerland.

Li J.-L.,National University of Singapore | Li J.-L.,Swinburne University of Technology | Liu X.-Y.,Donghua University | Liu X.-Y.,National University of Singapore
Advanced Functional Materials | Year: 2010

This article gives an overview of the current progress of a class of supramolecular soft materials consisting of fiber networks and the trapped liquid. After discussing the up-to-date knowledge on the types of fi ber networks and the correlation to the rheological properties, the gelation mechanism turns out to be one of the key subjects for this review. In this concern, the following two aspects will be focused upon: the single fi ber network formation and the multi-domain fi ber network formation of this type of material. Concerning the fi ber network formation, taking place via nucleation, and the nucleationmediated growth and branching mechanism, the theoretical basis of crystallographic mismatch nucleation that governs fi ber branching and formation of three-dimensional fi ber networks is presented. In connection to the multidomain fi ber network formation, which is governed by the primary nucleation and the subsequent formation of single fi ber networks from nucleation centers, the control of the primary nucleation rate will be considered. Based on the understanding on the the gelation mechanism, the engineering strategies of soft functional materials of this type will be systematically discussed. These include the control of the nucleation and branching-controlled fi ber network formation in terms of tuning the thermodynamic driving force of the gelling system and introducing suitable additives, as well as introducing ultrasound. Finally, a summary and the outlook of future research on the basis of the nucleation-growth-controlled fi ber network formation are given. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.

Wong W.-K.,Hong Kong Polytechnic University | Bai E.,Donghua University | Chu A.W.-C.,Hong Kong Polytechnic University
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics | Year: 2010

A fuzzy time series has been applied to the prediction of enrollment, temperature, stock indices, and other domains. Related studies mainly focus on three factors, namely, the partition of discourse, the content of forecasting rules, and the methods of defuzzification, all of which greatly influence the prediction accuracy of forecasting models. These studies use fixed analysis window sizes for forecasting. In this paper, an adaptive time-variant fuzzy-time-series forecasting model (ATVF) is proposed to improve forecasting accuracy. The proposed model automatically adapts the analysis window size of fuzzy time series based on the prediction accuracy in the training phase and uses heuristic rules to generate forecasting values in the testing phase. The performance of the ATVF model is tested using both simulated and actual time series including the enrollments at the University of Alabama, Tuscaloosa, and the Taiwan Stock Exchange Capitalization Weighted Stock Index (TAIEX). The experiment results show that the proposed ATVF model achieves a significant improvement in forecasting accuracy as compared to other fuzzy-time-series forecasting models. © 2010 IEEE.

Yu D.-G.,University of Shanghai for Science and Technology | Lu P.,Donghua University | Branford-White C.,London Metropolitan University | Yang J.-H.,University of Shanghai for Science and Technology | Wang X.,University of Shanghai for Science and Technology
Nanotechnology | Year: 2011

A modified coaxial electrospinning process including an electrolyte solution as sheath fluid was used for preparing high quality polymer nanofibers. A series of polyacrylonitrile (PAN) nanofibers were fabricated utilizing a coaxial electrospinning containing LiCl in N, N-dimethylacetamide (DMAc) as the sheath fluid. FESEM results demonstrated that the sheath LiCl solutions have a significant influence on the quality of PAN nanofibers. Nanofibers with smaller diameters, smoother surfaces and uniform structures were successfully prepared. The diameters of nanofibers were controlled by adjusting the conductivity of the sheath fluid over a suitable range and this was determined by varying LiCl concentrations. The influence of the effect of LiCl on the formation of PAN fibers is discussed and it is concluded that coaxial electrospinning with electrolyte solutions is a convenient and facile process for achieving high quality polymer nanofibers. © 2011 IOP Publishing Ltd.

Zhang Y.,Kawamura Institute of Chemical Research | Zhang Y.,Donghua University | Kato S.,Kawamura Institute of Chemical Research | Anazawa T.,Kawamura Institute of Chemical Research | Anazawa T.,AT Laboratory
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2010

A multilayered microchip (25 × 95 mm) used for vacuum distillation is designed, fabricated and tested by rectification of a water-methanol mixture. The polymer chip employs a cooling channel to generate a temperature gradient along a distillation channel below, which is separated into a channel (72 m deep) for liquid phase and a channel (72 m deep) for vapor phase by an incorporated microporous poly(tetrafluoroethylene) (PTFE) membrane. The temperature gradient is controlled by adjusting hotplate temperature and flow rate of cooling water to make the temperatures in the stripping section higher than the increasing boiling points of the water-enriched liquids and the temperatures in the rectifying section lower than the decreasing dew points of the methanol-enriched vapors. The effects of temperature gradient, feed composition, feed flow rate and membrane pore size on the micro distillation are also investigated. A theoretical plate number up to 1.8 is achieved at the optimum conditions. © 2010 The Royal Society of Chemistry.

Left ventricular hypertrophy (LVH) in hypertension is characterized by thickening of myocardium and decrease in heart chamber volume in response to mechanical or pathological stress, but the underlying molecular mechanisms remain to be defined. In this work, we investigate whether mitochondrial prohibitin (PHB) was involved in the progression of LVH in spontaneous hypertensive rats (SHR). First, it was found that mitochondrial dysfunction occurred in left ventricles of SHR. Through analysis using quantitative reverse transcription polymerase chain reaction and Western blotting, it was found that PHB mRNA and mitochondrial PHB levels in left ventricles of SHR were significantly lower than that in Wistar-Kyoto rats. Furthermore, PHB mRNA levels were negatively correlated to left ventricles weight-to-body weight ratio in SHR. Knockdown of PHB led to increased formation of mitochondrial reactive oxygen species (ROS) and reduced activities of complex I, mitochondrial adenosine triphosphate generation and mitochondrial membrane potential in cultured cardiomyocytes. Knockdown of PHB contributed to the cardiomyocyte hypertrophy, which could be attenuated by treatment with the Tempol. Angiotensin II (AngII) was increased in plasma and left ventricles of SHR. Incubation with AngII reduced mitochondrial PHB expression in cardiomyocytes, which was reversed when pretreated with losartan. In conclusion, reduction of PHB expression in left ventricles in SHR contributed to LVH, at least in part, through promoting mitochondrial ROS formation. © 2014 Informa UK, Ltd.

Zhang Y.,University of Idaho | Huang Y.,Donghua University | Parrish D.A.,U.S. Navy | Shreeve J.M.,University of Idaho
Journal of Materials Chemistry | Year: 2011

Energetic salts based on the 4-amino-3,5-dinitropyrazolate anion and selected nitrogen-rich cations were prepared in high yield by neutralization or metathesis reactions. Their key properties of the resulting energetic salts, such as melting point, thermal stability (169-303 °C), density (1.54-1.84 g cm -3), impact sensitivity (>60 J), heat of formation, and detonation pressure (20.99-32.55 GPa) and velocity (7712-8751 m s -1), were measured or calculated. As highly insensitive energetic materials, salts 9 (32.55 GPa, 8743 m s -1) and 11 (28.85 GPa, 8751 m s -1) are comparable with 1,3,5-triamino-2,4,6-trinitrobenzene (TATB, 31.15 GPa and 8114 m s -1). © 2011 The Royal Society of Chemistry.

Fan H.,Donghua University
ICIC Express Letters | Year: 2014

In this paper we analyze a multi-regional economic network model with community structure, which is first proposed in [9]. The model was constructed to describe open economic systems and study the strength of fluctuations in such open economic systems. A hidden feedback mechanism in the multi-regional economic network model with community structure was found. In the present paper the hidden feedback mechanism is formally analyzed. A crucial assumption of the analysis is that there is a sufficiently large number of countries. Our analytical results confirm the empirical results obtained in [9]. © 2014 ISSN 1881-803X.

Yang Y.,CAS Shanghai Institute of Organic Chemistry | Zheng F.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Tetrahedron | Year: 2011

2′,3′-Dideoxy-6′-fluorocarbocyclic nucleosides, analogues of highly bioactive carbovir and abacavir were synthesized. The notable steps were the incorporation of fluoromethylene group by way of silicon-induced Reformatskii-Claisen rearrangement of allyl bromofluoroacetate, the construction of the carbocyclic ring via ring-closing metathesis (RCM) and the introduction of base by Mitsunobu reaction. © 2011 Published by Elsevier Ltd.

Liu F.,Donghua University
International Journal of Modelling, Identification and Control | Year: 2010

The fact that the traffic flow system is a complex and non-linear system is extensively accepted by academe. The quantitative depiction research on complexity and non-linearity of traffic flow system is now in the ascendant. This paper focuses on the problem of how system scaling affects the complexity degree of a system. Firstly, Lyapunov index, relevancy dimension and the Lempel-Ziv algorithm are introduced for scientific depiction of the non-linear characteristics of traffic flow system. Based on measurements, three actual time headway sequences and three 20s-period traffic flow sequences are gained. By the simulation of the traffic flow system, five traffic flow sequences are obtained whose periods are 1 min, 2 min, 3 min, 4 min and 5 min, respectively. By calculating the Lyapunov index, relevancy dimension and Lempel-Ziv complexity degree of above traffic flow sequences, it was found that chaos, fractal and high complexity degree existed in the time headway sequences, but the complexity degree was gradually reduced with the gradually increasing scaling. So four conclusions and two hypotheses are obtained: 1 the complexity degrees of the same system are different under different scaling 2 negative correlation exists between the complexity degree and the depicting scaling of a system to a certain extent. Copyright © 2010 Inderscience Enterprises Ltd.

Tan L.,Shanghai JiaoTong University | Wan A.,Shanghai JiaoTong University | Pan D.,Donghua University
Polymer International | Year: 2011

The effects of solution composition and temperature on the viscoelasticity of concentrated polyacrylonitrile (PAN) solutions were studied using a variety of rheological measurements, such as steady-state shearing, dynamic stress sweep and transient rheological tests. The first normal stress difference N1 and the shear stress τ were found to increase with decreasing temperature and increasing PAN concentration and water content in the solutions. The crossover point of N1 and τ, denoting the equal contribution of viscosity and elasticity to the viscoelasticity of the solutions, moved to lower shear rates at lower temperature, higher PAN concentration and higher water content. The values of the relaxation time (λ) were larger at 70 °C than at 40 °C. In addition, the changes of λ with PAN concentration and water content were different at the two temperatures, ascribed to the different states of the solutions. The PAN solutions were in the linear viscoelastic regime in the temperature range 40-70 °C when the shear stress was below 300 Pa. The creep compliance recovery rate decreased with increasing temperature, but increased with increasing PAN concentration and water content. Thixotropic tests showed that the thixotropy of the solutions was also affected by the solution composition and temperature. Gelation was found to influence the way the solution composition and temperature affected the viscoelastic properties of the PAN solutions. © 2011 Society of Chemical Industry.

Yang D.,Donghua University | Dong M.,Shanghai JiaoTong University
Advanced Engineering Informatics | Year: 2012

Product configuration is an essential means for selecting various components to constitute a customized product with the aim of meeting the individualized requirements of a customer. Nevertheless, configuration conflicts may occur when too strict requirements of the customer are given and thus any configuration cannot be found to satisfy the customer requirements. In this situation, it is vital important for a product configurator to recommend the corrective actions for generating valid configurations. In this paper, we present a method of applying constraint satisfaction to resolve product configuration conflicts. In the presented approach, the configuration conflict problem is encoded as a CSP (constraint satisfaction problem). Therefore, the resolution to the configuration conflict problem can be regarded as solving a CSP. As a consequence, corrective actions such as removing selected components or adding new components are suggested by the system. In the case of multiple resolving strategies, a multi-objective decision model is adopted to find the optimal repair strategy according to customer preferences. A computer configuration is illustrated to demonstrate the effectiveness of the presented approach. © 2012 Elsevier Ltd. All rights reserved.

Accurate prediction for kurtosis of bearing vibration signal is helpful to find out the fault of bearing as soon as possible. As it is difficult to obtain an appropriate embedding dimension in creating directly the prediction model of kurtosis of bearing vibration signal by relevance vector machine (RVM), the hybrid model of empirical mode decomposition and RVM with artificial bee colony algorithm (EMD-ABCRVM) is proposed for kurtosis forecasting of bearing vibration signal. The seven decomposed signals with different frequency range can be obtained by empirical mode decomposition for kurtosis of bearing vibration signal. The prediction models of the seven decomposed signals can be established by RVM with their each appropriate embedding dimension, and artificial bee colony algorithm (ABC) is used to select the appropriate kernel parameters of their RVM models. Thus, each RVM model of the seven decomposed signals has appropriate embedding dimension and kernel parameter. In order to show the superiority of the proposed EMD-ABCRVM method, the RVM models with several different embedding dimensions and Gaussian RBF kernel parameters are used to compare with the proposed EMD-ABCRVM method. The experimental results show that it is feasible for the proposed combination scheme to improve the prediction accuracy of RVM for kurtosis of bearing vibration signal. © 2015 Published by Elsevier Ltd.

Zhao X.D.,National University of Singapore | Fan H.M.,National University of Singapore | Fan H.M.,Northwest University, China | Liu X.Y.,National University of Singapore | And 2 more authors.
Langmuir | Year: 2011

Tuning the adhesive force on a superhydrophobic MnO 2 nanostructured film was achieved by fabricating different patterns including meshlike, ball cactus-like, and tilted nanorod structures. The marvelous modulation range of the adhesive forces from 130 to nearly 0 μN endows these superhydrophobic surfaces with extraordinarily different dynamic properties of water droplets. This pattern-dependent adhesive property is attributed to the kinetic barrier difference resulting from the different continuity of the three-interface contact line. This finding will provide the general strategies for the adhesion adjustment on superhydrophobic surfaces. © 2011 American Chemical Society.

Wu G.-c.,Donghua University | Lee E.W.M.,City University of Hong Kong
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

Fractional differential equations have been investigated by variational iteration method. However, the previous works avoid the term of fractional derivative and handle them as a restricted variation. We propose herein a fractional variational iteration method with modified Riemann Liouville derivative which is more efficient to solve the fractional differential equations. © 2010 Elsevier B.V. All rights reserved.

Zhang D.,University of Ontario Institute of Technology | Zhang D.,Donghua University | Lei J.,University of Ontario Institute of Technology
Robotics and Computer-Integrated Manufacturing | Year: 2011

Kinematic analysis is one of the key issues in the research domain of parallel kinematic manipulators. It includes inverse kinematics and forward kinematics. Contrary to a serial manipulator, the inverse kinematics of a parallel manipulator is usually simple and straightforward. However, forward kinematic mapping of a parallel manipulator involves highly coupled nonlinear equations. Therefore, it is more difficult to solve the forward kinematics problem of parallel robots. In this paper, a novel three degrees-of-freedom (DOFs) actuation redundant parallel manipulator is introduced. Different intelligent approaches, which include the Multilayer Perceptron (MLP) neural network, Radial Basis Functions (RBF) neural network, and Support Vector Machine (SVM), are applied to investigate the forward kinematic problem of the robot. Simulation is conducted and the accuracy of the models set up by the different methods is compared in detail. The advantages and the disadvantages of each method are analyzed. It is concluded that ν-SVM with a linear kernel function has the best performance to estimate the forward kinematic mapping of a parallel manipulator. © 2010 Elsevier Ltd. All rights reserved.

Qin X.-H.,Donghua University
Journal of Industrial Textiles | Year: 2011

Electrospinning is a relatively simple method to produce submicron fibers from solutions of different polymers and polymer blends. In this study, PAN (polyacrylonitrile) fibers web was fabricated by electrospinning, and then was pre-oxidated. Effects of pre-oxidated heating rate on the structure and property of pre-oxidation web were discussed in this article. Thermal gravimetric (TG) curves were used to compare the thermal stability of PAN pre-oxidated samples under different pre-oxidated heating rates. TG curves showed that the integral procedural decomposition temperature was the highest when the pre-oxidated heating rate was 5°C/minute, that is, the thermal stability of pre-oxidated nanofibrou web was the best under this condition. Moreover, results showed that with pre-oxidated heating rate increasing, the rate of mass loss gradually increased by moisture content analysis. Effect of the heating rate on central degree of the pre-oxidated web was not obvious by differential scanning calorimetry analysis, and the cyclization and dehydrogenation formed the final structure of the aromatic by infrared spectroscopy analysis. Especially, carbon nanofibers could be obtained from the pre-oxidated nanofibers at pre-oxidated heating rate 5°C/minute with smooth surface and small fiber dispersion as well as solid and no empty fiber structure of the section. © The Author(s), 2011.

Qiu X.-L.,CAS Shanghai Institute of Organic Chemistry | Qiu X.-L.,Wisdom Pharmaceutical Co. | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
European Journal of Organic Chemistry | Year: 2011

Introduction of fluorine atoms or fluorine-containing groups into amino acids has attracted much attention from bioorganic and medicinal chemists because the resulting fluorinated amino acids have found wide application as potential enzyme inhibitors and antitumor (antibacterial) agents. Additionally, it is well known that replacement of naturally occurring amino acid(s) in some peptide chains with their fluorinated counterparts can significantly increase specific protein-ligand or protein-protein interactions, leading to in-creases in the proteolytic and thermal stabilities of peptide compounds and, as a result, promote their therapeutic properties. This microreview summarizes important advances in the synthesis of fluorinated amino acids since 2005. The contents are simply divided into three groups on the basis of amino acid types: fluorinated α-amino acids (F-αAAs), fluorinated β-amino acids (F-βAAs), and fluorinated cyclic amino acids (F-CAAs). © 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Ding D.,Shanghai Key Laboratory of Modern Optical Systems | Wang Z.,Brunel University | Lam J.,University of Hong Kong | Shen B.,Donghua University
IEEE Transactions on Automatic Control | Year: 2015

This technical note deals with the H control problem for a class of discrete time-varying nonlinear systems with both randomly occurring nonlinearities and fading measurements over a finite-horizon. The system measurements are transmitted through fading channels described by a modified stochastic Rice fading model. The purpose of the addressed problem is to design a set of time-varying controllers such that, in the presence of channel fading and randomly occurring nonlinearities, the H performance is guaranteed over a given finite-horizon. The model transformation technique is first employed to simplify the addressed problem, and then the stochastic analysis in combination with the completing squares method are carried out to obtain necessary and sufficient conditions of an auxiliary index which is closely related to the finite-horizon H performance. Moreover, the time-varying controller parameters are characterized via solving coupled backward recursive Riccati difference equations (RDEs). A simulation example is utilized to illustrate the usefulness of the proposed controller design scheme. © 1963-2012 IEEE.

Zhang P.,Donghua University
China Textile and Apparel | Year: 2015

Seamless knitting technology uses specific knitting equipment, computerized design systems and digital processing to produce a single entire piece of 3D structure from the machine. This article uses weft knitting seamless technology as an example to explain the characteristics of seamless wear, decoration and technical textile. The development of fine-gauge, multi-function and highly efficient seamless knitting equipment as well as seamless knitting products are also discussed.

Ding D.,Shanghai Key Laboratory of Modern Optical Systems | Wang Z.,Brunel University | Shen B.,Donghua University | Dong H.,Northeast Petroleum University
Automatica | Year: 2015

In this paper, the envelope-constrained H∗ filtering problem is investigated for a class of discrete time-varying stochastic systems over a finite horizon. The system under consideration involves fading measurements, randomly occurring nonlinearities (RONs) and mixed (multiplicative and additive) noises. A novel envelope-constrained performance criterion is proposed to better quantify the transient dynamics of the filtering error process over the finite horizon. The purpose of the problem addressed is to design a time-varying filter such that both the H∗ performance and the desired envelope constraints are achieved at each time step. By utilizing the stochastic analysis techniques combined with the ellipsoid description on the estimation errors, sufficient conditions are established in the form of recursive matrix inequalities (RMIs) reflecting both the envelope information and the desired H∗ performance index. The filter gain matrix is characterized by means of the solvability of the deduced RMIs. Finally, a simulation example is provided to show the effectiveness of the proposed filtering design scheme. © 2015 Elsevier Ltd.

Zhou Y.,Shanghai JiaoTong University | Li J.,Shanghai JiaoTong University | Wang D.,Donghua University
IEEE Signal Processing Letters | Year: 2010

We consider the problem of target tracking in a wireless sensor network (WSN) that consists of randomly distributed range-only sensors. Quantized measurements are usually adopted in such a network to attack the problem of limited power supply and communication bandwidth. Assuming that local sensor noises are mutually independent, we derive the posterior Cramér-Rao lower bound (CRLB) on the mean squared error (MSE) of target tracking in WSNs with quantized range-only measurements. Recursion of posterior CRLB on tracking based on both constant velocity (CV) and constant acceleration (CA) model for target dynamics and a general range-only measuring model for local sensors are obtained. Due to the analytical difficulties, particle filter is applied to approximate the theoretical bounds. To illustrate the posterior CRLB, an example on tracking a target with noisy circular trajectories is given. © 2009 IEEE.

Peng Y.,Donghua University | Deng K.,Nanjing Southeast University
Composites Part A: Applied Science and Manufacturing | Year: 2015

Abstract Novel Sn-Bi/reduced graphene oxide nanosheets (RGOS) nanocomposites were fabricated using electro-chemical deposition process at room temperature. The RGOS dispersed and distributed in Sn-Bi alloy. Nano-sized Sn-Bi grain clusters grew on the surface of RGOS and the Sn-Bi grains became finer after the incorporation of RGOS. The mechanical properties including micro-hardness and shear strength were enhanced by the incorporation of RGOS. The enhance mechanism of RGOS in Sn-Bi/RGOS nanocomposites was proposed by finite element method simulation. The graphene with extra-thin thickness and huge aspect ratio lead to an effective stress transfer and stress concentration occurs near the edge of graphene. The Sn-Bi/RGOS nanocomposites are promising in application as TIM of high power electronics, integrated circuits. © 2015 Elsevier Ltd. All rights reserved.

Wang L.,Wayne State University | Rege M.,Rochester Institute of Technology | Dong M.,Wayne State University | Ding Y.,Donghua University
IEEE Transactions on Knowledge and Data Engineering | Year: 2012

Traditional clustering techniques are inapplicable to problems where the relationships between data points evolve over time. Not only is it important for the clustering algorithm to adapt to the recent changes in the evolving data, but it also needs to take the historical relationship between the data points into consideration. In this paper, we propose ECKF, a general framework for evolutionary clustering large-scale data based on low-rank kernel matrix factorization. To the best of our knowledge, this is the first work that clusters large evolutionary data sets by the amalgamation of low-rank matrix approximation methods and matrix factorization-based clustering. Since the low-rank approximation provides a compact representation of the original matrix, and especially, the near-optimal low-rank approximation can preserve the sparsity of the original data, ECKF gains computational efficiency and hence is applicable to large evolutionary data sets. Moreover, matrix factorization-based methods have been shown to effectively cluster high-dimensional data in text mining and multimedia data analysis. From a theoretical standpoint, we mathematically prove the convergence and correctness of ECKF, and provide detailed analysis of its computational efficiency (both time and space). Through extensive experiments performed on synthetic and real data sets, we show that ECKF outperforms the existing methods in evolutionary clustering. © 1989-2012 IEEE.

Wang Z.,Donghua University | Wang Z.,Brunel University | Liu Y.,Yangzhou University | Liu X.,Brunel University | Shi Y.,Chinese Academy of Sciences
Neurocomputing | Year: 2010

In this paper, the robust H state estimation problem is investigated for a general class of uncertain discrete-time stochastic neural networks with probabilistic measurement delays. The measurement delays of the neural networks are described by a binary switching sequence satisfying a conditional probability distribution. The neural network under study involves parameter uncertainties, stochastic disturbances and time-varying delays, and the activation functions are characterized by sector-like nonlinearities. The problem addressed is the design of a full-order state estimator, for all admissible uncertainties, nonlinearities and time-delays, the dynamics of the estimation error is constrained to be robustly exponentially stable in the mean square and, at the same time, a prescribed H disturbance rejection attenuation level is guaranteed. By using the Lyapunov stability theory and stochastic analysis techniques, sufficient conditions are first established to ensure the existence of the desired estimators. These conditions are dependent on the lower and upper bounds of the time-varying delays. Then, the explicit expression of the desired estimator gains is described in terms of the solution to a linear matrix inequality (LMI). Finally, a numerical example is exploited to show the usefulness of the results derived. © 2010 Elsevier B.V.

Jiang X.-Y.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Angewandte Chemie - International Edition | Year: 2013

Radical paths: The title reaction of olefins with NaSO2CF 3 and N-hydroxy-N-phenylacetamide at room temperature is described for the first time (see scheme). This reaction provides a practical and convenient route to a series of trifluoromethylated alcohols bearing a wide range of functional groups. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Ji H.,University of Texas at Austin | Ji H.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Zhao X.,University of Texas at Austin | Zhao X.,Donghua University | And 12 more authors.
Nature Communications | Year: 2014

Experimental electrical double-layer capacitances of porous carbon electrodes fall below ideal values, thus limiting the practical energy densities of carbon-based electrical double-layer capacitors. Here we investigate the origin of this behaviour by measuring the electrical double-layer capacitance in one to five-layer graphene. We find that the capacitances are suppressed near neutrality, and are anomalously enhanced for thicknesses below a few layers. We attribute the first effect to quantum capacitance effects near the point of zero charge, and the second to correlations between electrons in the graphene sheet and ions in the electrolyte. The large capacitance values imply gravimetric energy storage densities in the single-layer graphene limit that are comparable to those of batteries. We anticipate that these results shed light on developing new theoretical models in understanding the electrical double-layer capacitance of carbon electrodes, and on opening up new strategies for improving the energy density of carbon-based capacitors. © 2014 Macmillan Publishers Limited. All rights reserved.

Du Z.,Hong Kong Polytechnic University | Du Z.,Donghua University | Hu H.,Hong Kong Polytechnic University
Textile Research Journal | Year: 2013

The objective of this part is to compare the results calculated from the model developed in part I with experimental measurements. Five warp-knitted spacer fabrics made with polyester filaments but with different thicknesses and outer layer structures, as well as different spacer yarn fineness, are selected for testing their compression properties under both the plane plate and spherical ball compressions. The plane compression stress-strain curve of each fabric sample is divided into three regions and the curve segment in each region is approximately represented by a linear equation. The equation constants, that is, modulus E and intercept σ0 for each curve segment, are obtained by the linear fitting method. Based on the values of E and σ0 obtained, the compression curve under spherical ball compression of each fabric sample is calculated and compared with the experimental one. Three compression parameters, including the maximal compression force and compression work at the compression strain of 0.70, as well as the linear degree, are also used for comparison. Good agreements are obtained between the calculations and measurements. Thus, based on the plane compression testing results, the validated model can be used to predict the spherical compression behaviors of knitted spacer fabrics compressed with different radii of the spherical balls. © The Author(s) 2013.

Chen C.,CAS Shanghai Institute of Organic Chemistry | Chu L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Journal of the American Chemical Society | Year: 2012

A metal-free oxidative trifluoromethyl-thiolation of terminal alkynes using readily available CF3SiMe3 and elemental sulfur at room temperature has been developed. This reaction provides an efficient and convenient method for the preparation of alkynyl trifluoromethyl sulfides bearing a wide range of functional groups. Preliminary investigation revealed that elemental sulfur instead of air acted as the oxidant. © 2012 American Chemical Society.

Zhou J.,Donghua University | Wang J.,Key Laboratory of Textile Science and Technology
Textile Research Journal | Year: 2013

In this paper, we present a new fabric defect detection algorithm based on learning an adaptive dictionary. Such a dictionary can efficiently represent columns of normal fabric images using a linear combination of its elements. Benefiting from the fact that defects on a fabric appear to be small in size, a dictionary can be learned directly from a testing image itself instead of a reference, allowing more flexibility to adapt to varying fabric textures. When modeling a test image using the learned dictionary, columns involving anomalies of the test image are likely to have larger reconstruction errors than normal ones. The anomalous regions (defects) can be easily enhanced in the residual image. Then, a simple threshold operation is able to segment the defective pixels from the residual image. To adapt more defects, especially some linear defects, we rotate the test image by a slight degree and re-analyze the rotated image. Compared to the Fourier method, experimental results on 47 real-world test images with defects reveal that our algorithm is able to adapt to varying fabric textures and exhibits more accurate defect detection. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

Meng K.,Soochow University of China | Wang X.,Donghua University
Textile Research Journal | Year: 2013

Melt-blown die usually consists of two components: the coat-hanger feed distributor and the spinneret plate with a series of orifices. In this paper, fluid flow in double melt-blown die was simulated using the three-dimensional finite element method. The fluid flow inside the melt-blown die was analyzed, particularly the flow near the joint point of the double melt-blown die and the entrance of the orifice. Velocity distribution at the outlet of the die was also analyzed through a comparison with the fluid flow in the double melt-blown coat-hanger feed distributor. The results show that the convergence flow around the entrance of the orifice can improve the velocity distribution at the die's outlet to a certain extent. The improved uniformity of the velocity distribution at the outlet of the double melt-blown die proves the feasibility of using side-by-side melt-blown die to fabricate wider uniform melt-blown webs. © The Author(s) 2013.

Hu W.,University of California at Los Angeles | Hu W.,Donghua University | Niu X.,University of California at Los Angeles | Zhao R.,University of California at Los Angeles | Pei Q.,University of California at Los Angeles
Applied Physics Letters | Year: 2013

Highly flexible transparent capacitive sensors have been demonstrated for the detection of deformation and pressure. The elastomeric sensors employ a pair of compliant electrodes comprising silver nanowire networks embedded in the surface layer of polyurethane matrix, and a highly compliant dielectric spacer sandwiched between the electrodes. The capacitance of the sensor sheets increases linearly with strains up to 60% during uniaxial stretching, and linearly with externally applied transverse pressure from 1 MPa down to 1 kPa. Stretchable sensor arrays consisting of 10 × 10 pixels have also been fabricated by patterning the composite electrodes into X-Y addressable passive matrix. © 2013 American Institute of Physics.

Ge Z.,Hong Kong Polytechnic University | Ge Z.,Donghua University | Hu H.,Hong Kong Polytechnic University
Textile Research Journal | Year: 2013

This paper presents an innovative three-dimensional (3D) fabric structure for composite reinforcement. Different from most conventional 3D fabric structures, the new structure displays a negative Poisson's ratio (NPR) effect under compression. Based on a manufacturing process developed by combining both non-weaving and knitting technologies, four NPR 3D fabric samples with different warp yarn diameters were first manufactured manually. Then, their Poisson's ratio (PR) values under compression along the fabric thickness direction were experimentally evaluated. A geometrical model was also proposed for the theoretical calculation of PR values of these fabrics and was compared with experimental data. The good agreements were obtained between the calculation and experiment. The results show that all the 3D fabrics display NPR effect under compression, which results in a unique feature that allows the structure to concentrate itself under the compressive load to better resist the load. This special feature makes this innovative 3D fabric structure very attractive for many potential applications such as automobile, aerospace, defense and sports equipment, where impact protection can be a highly desirable property. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

Wu X.,CAS Shanghai Institute of Organic Chemistry | Chu L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Angewandte Chemie - International Edition | Year: 2013

A silver bullet: The title reaction results in selective formation of trifluoromethylated alkanes, and is in contrast to the previously reported transition-metal-catalyzed trifluoromethylation of olefins to generate a series of trifluoromethylated allylic compounds. Preliminary mechanistic investigations indicate that the current hydrotrifluoromethylation proceeds through a pathway involving a CF3 radical species. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Jianyong F.,Donghua University
Textile Research Journal | Year: 2013

Hemp fiber has many superior performances and applications, for instance, the yarns, woven fabrics, knitted fabrics and composite materials. However, there is no hemp nonwoven in the market and in application. Therefore, in order to continue to expand the application fields and increase the additional value of hemp fiber, we developed a hemp/cotton spunlaced nonwoven to research its oil filtration property and verify the filtration mechanisms. The results indicate that the filtration efficiency of a hemp/cotton spunlaced nonwoven increases with the increase in particle diameter and the decrease in filtration time. In addition, compared with the change in filtration efficiency with the increase in particle diameter, it can be found that the filtration time has a relatively smaller influence on filtration efficiency. The experimental results suggest that the filtration efficiencies of direct interception and gravitational deposition are substantially higher than inertia collision, while the filtration efficiency of inertia collision is so low that can be neglected. Through a theoretical analysis of filtration we make a verification of the mechanisms and suggest a new equation to reduce the errors in filtration efficiency between the theoretical results and experimental values. Then, the hemp/cotton spunlaced nonwoven was used to develop two different automobile engine oil filters on an experimental scale. © The Author(s) 2013.

Zhou Z.,Shanghai Normal University | Kong B.,Shanghai Normal University | Yu C.,Shanghai Normal University | Shi X.,Donghua University | And 6 more authors.
Scientific Reports | Year: 2014

We report here a facile thermal decomposition approach to creating tungsten oxide nanorods (WO2.9 NRs) with a length of 13.1 ± 3.6 nm and a diameter of 4.4 ± 1.5 nm for tumor theranostic applications. The formed WO2.9 NRs were modified with methoxypoly(ethylene glycol) (PEG) carboxyl acid via ligand exchange to have good water dispersability and biocompatibility. With the high photothermal conversion efficiency irradiated by a 980 nm laser and the better X-ray attenuation property than clinically used computed tomography (CT) contrast agent Iohexol, the formed PEGylated WO 2.9 NRs are able to inhibit the growth of the model cancer cells in vitro and the corresponding tumor model in vivo, and enable effective CT imaging of the tumor model in vivo. Our "killing two birds with one stone" strategy could be extended for fabricating other nanoplatforms for efficient tumor theranostic applications.

Highly dispersed Co(0.5)Zn(0.5)Fe(2)O(4)/polypyrrole (CZFO/PPy) nanocomposites with enhanced electromagnetic properties and large surface area were rapidly and controllably prepared using microfluidic reactors. A novel magnetically controllable microdevice using the new adsorbent in a highly dispersed form was assembled and used for fluoride adsorption. Compared with traditional adsorption methods, the device displayed high adsorption efficiency and capacity. The adsorbents were regenerated with no significant loss in defluoridation ability, which indicates that the device is a realistic and highly efficient alternative way of removing fluoride pollution at low cost. Copyright © 2012 Elsevier B.V. All rights reserved.

Faraz N.,Donghua University | Khan Y.,Zhejiang University
Ain Shams Engineering Journal | Year: 2011

The steady two-dimensional MHD rotating flow of a second grade past a porous shrinking surface is investigated. The governing system of partial differential equations is transformed into ordinary differential equations, which are then solved analytically by using the homotopy perturbation technique. The effects of the governing parameters on the flow field are obtained and discussed graphically in detail. © 2011 Ain Shams University. Production and hosting by Elsevier B.V. All rights reserved.

Yue R.-X.,Shanghai Normal University | Yue R.-X.,e-computing | Liu X.,Donghua University
Computational Statistics and Data Analysis | Year: 2010

Ir L-optimal designs are described for a kind of hierarchically ordered system of regression models with an r-dimensional response variable y. The components of y may be correlated with a known variance-covariance matrix Σ. The present results show that Ir L-optimal designs for this system of regression models do not depend on Σ. The Ir L-optimal designs are given for the systems of trigonometric and Haar wavelet regression models, respectively. © 2009 Elsevier B.V. All rights reserved.

Guo L.,Donghua University | Guo L.,Qufu Normal University | Chen C.,University of Chinese Academy of Sciences
Science China Chemistry | Year: 2015

In this review, a recent development of cationic α-diimine palladium(II) complexes for ethylene polymerization and copolymerization with polar functionalized comonomers was briefly described. First, the polymerization mechanism for this type of catalysts was discussed. Next, recent advances in ligand design were provided with special focus on the influence of ligand structures on the catalytic polymerization properties. Last, the ethylene homopolymerization and copolymerization with various polar comonomers, especially acrylate and vinyl ethers were summarized. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg.

Leung S.Y.S.,Hong Kong Polytechnic University | Tang Y.,Hong Kong Polytechnic University | Tang Y.,Donghua University | Wong W.K.,Hong Kong Polytechnic University
Expert Systems with Applications | Year: 2012

In this paper, a novel particle swarm optimization model for radial basis function neural networks (RBFNN) using hybrid algorithms to solve classification problems is proposed. In the model, linearly decreased inertia weight of each particle (ALPSO) can be automatically calculated according to fitness value. The proposed ALPSO algorithm was compared with various well-known PSO algorithms on benchmark test functions with and without rotation. Besides, a modified fisher ratio class separability measure (MFRCSM) was used to select the initial hidden centers of radial basis function neural networks, and then orthogonal least square algorithm (OLSA) combined with the proposed ALPSO was employed to further optimize the structure of the RBFNN including the weights and controlling parameters. The proposed optimization model integrating MFRCSM, OLSA and ALPSO (MOA-RBFNN) is validated by testing various benchmark classification problems. The experimental results show that the proposed optimization method outperforms the conventional methods and approaches proposed in recent literature. © 2011 Elsevier Ltd. All rights reserved.

Gao P.,Donghua University | Gao P.,Michigan State University | Ding Y.,Michigan State University | Li H.,Michigan State University | Xagoraraki I.,Michigan State University
Chemosphere | Year: 2012

Occurrence and removal efficiencies of fifteen pharmaceuticals were investigated in a conventional municipal wastewater treatment plant in Michigan. Concentrations of these pharmaceuticals were determined in both wastewater and sludge phases by a high-performance liquid chromatograph coupled to a tandem mass spectrometer. Detailed mass balance analysis was conducted during the whole treatment process to evaluate the contributing processes for pharmaceutical removal. Among the pharmaceuticals studied, demeclocycline, sulfamerazine, erythromycin and tylosin were not detected in the wastewater treatment plant influent. Other target pharmaceuticals detected in wastewater were also found in the corresponding sludge phase. The removal efficiencies of chlortetracycline, tetracycline, sulfamerazine, acetaminophen and caffeine were >99%, while doxycycline, oxytetracycline, sulfadiazine and lincomycin exhibited relatively lower removal efficiencies (e.g., <50%). For sulfamethoxazole, the removal efficiency was approximately 90%. Carbamazepine manifested a net increase of mass, i.e. 41% more than the input from the influent. Based on the mass balance analysis, biotransformation is believed to be the predominant process responsible for the removal of pharmaceuticals (22% to 99%), whereas contribution of sorption to sludge was relatively insignificant (7%) for the investigated pharmaceuticals. © 2012 Elsevier Ltd.

Gu H.,Donghua University | Miao M.,CSIRO
Journal of Composite Materials | Year: 2014

Natural plant fibres are short fibres that must be spun into continuous length yarns for the production of structured composites. Fibres in a twisted singles yarn are poorly aligned. The fibre alignment can be improved without sacrificing the yarn strength by forming a two-ply yarn from two singles yarns. In this paper, we analysed the differential geometry of fibre trajectory using an idealised twisted yarn model and derived the optimum two-ply yarn structure that gives the maximum Krenchel fibre orientation factor. In the optimum two-ply yarn, the ply twist is in the opposite direction to the singles twist and the ply-to-singles twist ratio is 0.28. Such a two-ply yarn construction is beneficial for all twisted yarns aimed for structural composites applications, particularly for yarns made from low cost natural fibres which are usually of short length, low strength and poor uniformity and thus require high twist to achieve sufficient strength for yarn manufacture and further handlings in composite fabrication. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

Shen B.,Donghua University
Sustainability (Switzerland) | Year: 2014

Sustainability is significantly important for fashion business due to consumers' increasing awareness of environment. When a fashion company aims to promote sustainability, the main linkage is to develop a sustainable supply chain. This paper contributes to current knowledge of sustainable supply chain in the textile and clothing industry. We first depict the structure of sustainable fashion supply chain including eco-material preparation, sustainable manufacturing, green distribution, green retailing, and ethical consumers based on the extant literature. We study the case of the Swedish fast fashion company, H&M, which has constructed its sustainable supply chain in developing eco-materials, providing safety training, monitoring sustainable manufacturing, reducing carbon emission in distribution, and promoting eco-fashion. Moreover, based on the secondary data and analysis, we learn the lessons of H&M's sustainable fashion supply chain from the country perspective: (1) the H&M's sourcing managers may be more likely to select suppliers in the countries with lower degrees of human wellbeing; (2) the H&M's supply chain manager may set a higher level of inventory in a country with a higher human wellbeing; and (3) the H&M CEO may consider the degrees of human wellbeing and economic wellbeing, instead of environmental wellbeing when launching the online shopping channel in a specific country. © 2014 by the author.

Yang S.,Donghua University | Nair A.S.,Amrita University | Ramakrishna S.,National University of Singapore
Materials Letters | Year: 2014

Here we fabricated quantum dot-sensitized solar cells (QDSCs) based on electrospinning of unique TiO2 nanostructures and subsequent CdS QDs deposition via successive ionic layer adsorption and reaction (SILAR) followed by dipole treatment (DT). It was found that by treating with 4-methoxy benzenethiol for 24 h, an overall conversion efficiency of 1.17% was achieved under AM1.5 illumination which corresponds to a dramatic 100% enhancement compared with that of untreated cells. The significant photovoltaic improvement was attributed to the upward shifting of CdS QDs energy levels for efficient charge separation and effective electron transport in electrospun TiO 2 nanostructures which is confirmed by electrochemical impedance spectroscopy. © 2013 Elsevier B.V.

Wu L.,Heze University | Sun J.,Donghua University
Applied Surface Science | Year: 2014

Polyvinylidene fluoride (PVDF) membrane and PVDF membrane with phenolphthalein polyethersulfone (PES-C) addition were prepared via thermally induced phase separation (TIPS) method by using diphenyl carbonate (DPC) and dimethyl acetamide (DMAc) as mixed diluents. The effects of coagulation temperature and pre-evaporation time on structure and properties of membranes were studied. The changes of sewage flux in MBR and the attenuation coefficient of sewage flux were investigated. The resistance distributions of PVDF and PVDF/PES-C membranes were compared by resistance analysis. Membrane composition and structure were characterized by ATR-FTIR, TGA, SEM and AFM. The foulant on membranes was analyzed by FTIR. The contact angle of PVDF/PES-C membrane was lower than that of PVDF membrane. A thinner skin layer and a porous cellular support layer formed in PVDF/PES-C membrane and resulted in a higher porosity and pure water flux. The pure water flux and porosity of PVDF/PES-C membrane increased with rising coagulation temperature and decreased with extending pre-evaporation time. The flux attenuation coefficient, the cake layer resistance and internal fouling resistance of PVDF/PES-C membrane in MBR were smaller than those of PVDF membrane in MBR. The FTIR spectrum of foulant on membrane indicated that the foulant on PVDF/PES-C membrane was mostly composed of protein and polysaccharide, while the foulant on pure PVDF membrane included biopolymer clusters besides protein and polysaccharide. © 2014 Elsevier B.V. All rights reserved.

In macromolecular self-avoiding random walk, movement of each chain-particle accompanies an instantaneous spin system with de Gennes n = 0 that provides extra energy, extra vacancy volume and relaxation time needed for chain-particles comovement. Using these additional and instantaneous spin systems not only directly yields the same Brownian motion mode in glass transition (GT) and reptation-tube model, but also proves that the entangled chain length corresponding to the Reynolds number in hydrodynamics and the inherent diffusion - delocalization mode of entangled chains, from frozen glass state to melt liquid state, is a chain-size solitary wave with transverse ripplon-like soft wave. Thus, the order parameter of GT is found. The various currently available GT theories, such as Static Replica, Random First-Order Transition, Potential Energy Landscape, Mode-Coupling and Nanoscale Heterogeneity, can be unified using the additional and instantaneous spin system. GT served as an inspiration and continues to serve as the paradigm in the universal random delocalization transitions from disorder to more disorder until turbulence. © 2013 Author(s).

Cheng R.,University of Surrey | Jin Y.,University of Surrey | Jin Y.,Donghua University
Information Sciences | Year: 2015

Social learning plays an important role in behavior learning among social animals. In contrast to individual (asocial) learning, social learning has the advantage of allowing individuals to learn behaviors from others without incurring the costs of individual trials-and-errors. This paper introduces social learning mechanisms into particle swarm optimization (PSO) to develop a social learning PSO (SL-PSO). Unlike classical PSO variants where the particles are updated based on historical information, including the best solution found by the whole swarm (global best) and the best solution found by each particle (personal best), each particle in the proposed SL-PSO learns from any better particles (termed demonstrators) in the current swarm. In addition, to ease the burden of parameter settings, the proposed SL-PSO adopts a dimension-dependent parameter control method. The proposed SL-PSO is first compared with five representative PSO variants on 40 low-dimensional test functions, including shifted and rotated test functions. The scalability of the proposed SL-PSO is further tested by comparing it with five state-of-the-art algorithms for large-scale optimization on seven high-dimensional (100-D, 500-D, and 1000-D) benchmark functions. Our comparative results show that SL-PSO performs well on low-dimensional problems and is promising for solving large-scale problems as well. © 2014 Elsevier Inc. All rights reserved.

Xu F.F.,Donghua University | Xu F.F.,Urbana University | Imlay J.A.,Urbana University
Applied and Environmental Microbiology | Year: 2012

The toxicity of soft metals is of broad interest to microbiologists, both because such metals influence the community structures in natural environments and because several metals are used as antimicrobial agents. Their potency roughly parallels their thiophilicity, suggesting that their primary biological targets are likely to be enzymes that contain key sulfhydryl moieties. A recent study determined that copper poisons Escherichia coli in part by attacking the exposed [4Fe-4S] clusters of dehydratases. The present investigation sought to test whether other soft metals also target these enzymes. In vitro experiments revealed that lowmicromolar concentrations of Ag(I) and Hg(II) directly inactivated purified fumarase A, a member of the dehydratase family. The enzyme was also poisoned by higher levels of Cd(II) and Zn(II), but it was unaffected by even millimolar concentrations of Mn(II), Co(II), Ni(II), and Pb(II). Electron paramagnetic resonance analysis and measurements of released iron confirmed that damage was associated with destruction of the [4Fe-4S] cluster, and indeed, the reconstruction of the cluster fully restored activity. Growth studies were then performed to test whether dehydratase damage might underlie toxicity in vivo. Barely toxic doses of Ag(I), Hg(II), Cd(II), and Zn(II) inactivated all tested members of the [4Fe-4S] dehydratase family. Again, activity was recovered when the clusters were rebuilt. The metals did not diminish the activities of other sampled enzymes, including NADH dehydrogenase I, an iron-sulfur protein whose clusters are shielded by polypeptide. Thus, the data indicate that dehydratases are damaged by the concentrations of metals that initiate bacteriostasis. © 2012, American Society for Microbiology.

Li Y.,Donghua University
Proceedings - 5th International Conference on Computational Intelligence, Communication Systems, and Networks, CICSyN 2013 | Year: 2013

With the fast development of Wireless Sensor Networks (WSNs) and RFID technology, many Internet of Things (IOT) applications have been deployed in recent years. Smart home energy management systems form part of the smart grid program and are a fast developing smart home application area. Inadequate security is a big issue in smart home energy management systems. Most security protocols widely used for computer network and internet security cannot be implemented in smart home energy management systems as they are computational expensive for the wireless sensor nodes used in smart home applications. The major issue in the security of smart home energy management systems is the establishment of the initial session key between the wireless nodes and control center. In this paper, we propose a lightweight key establishment protocol for smart home energy management systems and present the implementation details of the protocol. © 2013 IEEE.

Du Z.,Hong Kong Polytechnic University | Du Z.,Donghua University | Hu H.,Hong Kong Polytechnic University
Textile Research Journal | Year: 2012

Knitted spacer fabrics have been developed into a variety of special textile products for a wide range of applications. As a type of sandwich structure, their applications are largely dependent on their compression properties. Although several experimental and theoretical studies have been carried out on their plate compression properties, their spherical compression behaviors have not been deeply studied yet. This paper reports a study of the spherical compression behavior of knitted spacer fabrics. The paper includes two parts. The first part focuses on a theoretical analysis of a spacer fabric under spherical ball compression. A theoretical model is developed to predict the spherical ball compression properties of the fabric. The non-dimensional parameters are introduced to analyze the effects of the fabric thickness and ball radius based on the theoretical relationship established between the compression force and compression strain at the maximal compression point. The analysis results reveal that the spherical compression effects decrease with increasing ball radius, and increase with increasing the fabric thickness. It is expected that this study could help us better understand the behavior of knitted spacer fabrics under spherical compression. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

Wang J.,Donghua University
Advanced Materials Research | Year: 2011

Neural network learning algorithms are widely used in medical diagnosis, bioinformatics, intrusion detection, homeland security and other fields. The common of these applications is that all of them need to extract patterns and predict trends from a large number of complex data. In these applications, how to protect the privacy of sensitive data and personal information from disclosure is an important issue. At present, the vast majority of existing neural network learning algorithms did not consider how to protect the data privacy in the process of learning. So this paper proposes two privacy-preserving back-propagation neural network protocols applied to horizontally partitioned data and vertically partitioned data separately. The two protocols are suitable for multiple participants in a distributed environment. The results of experiments show the difference of the test error rate between the proposed two protocols and the respective non-privacy preserving versions. © (2011) Trans Tech Publications, Switzerland.

Jinqiu Z.,Donghua University | Jianchun Z.,Quartermaster Research Institute
Textile Research Journal | Year: 2010

In this study we focus on some key problems encountered in the processing of bast fibers from hemp for the production of textiles. These problems include the high content of pectin, the excessive rigidity and the poor "spinnability" of hemp fibers. The results of a thorough analysis of the physical and chemical properties of the fibers at each step of the process are presented. The parameters measured include the length, fineness, surface appearance, tensile properties, moisture absorption, flexibility and crystallinity of the fibers. The refinement of the processing described here results in fibers that are thinner, cleaner, more flexible and more uniform in length, all of which contributed to an improved spinning performance of the hemp fibers. © The Author(s), 2010.

Hoffmann C.,Donghua University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

We consider weighted counting of independent sets using a rational weight x: Given a graph with n vertices, count its independent sets such that each set of size k contributes xk. This is equivalent to computation of the partition function of the lattice gas with hard-core self-repulsion and hard-core pair interaction. We show the following conditional lower bounds: If counting the satisfying assignments of a 3-CNF formula in n variables (#3SAT) needs time 2Ω(n) (i.e. there is a c > 0 such that no algorithm can solve #3SAT in time 2cn), counting the independent sets of size n/3 of an n-vertex graph needs time 2Ω(n) and weighted counting of independent sets needs time for all rational weights x ≠ 0. We have two technical ingredients: The first is a reduction from 3SAT to independent sets that preserves the number of solutions and increases the instance size only by a constant factor. Second, we devise a combination of vertex cloning and path addition. This graph transformation allows us to adapt a recent technique by Dell, Husfeldt, and Wahlén which enables interpolation by a family of reductions, each of which increases the instance size only polylogarithmically. © 2010 Springer-Verlag.

Huang Y.,Donghua University | Gard G.L.,Portland State University | Shreeve J.M.,University of Idaho
Tetrahedron Letters | Year: 2010

1,4-Disubstituted 1,2,3-triazoles containing a pentafluorosulfanylalkyl group were synthesized in good to excellent yields (57-91%) by the click cycloadditions of in situ generated SF5-alkyl azides with aromatic and aliphatic alkynes. Nucleophilic substitution of the SF5 group was observed for the first time in a bench-top reaction. © 2010 Elsevier Ltd. All rights reserved.

Li L.,Hefei University of Technology | Zhou J.,Donghua University | Wu C.,Hefei University of Technology | Wu C.,Chinese University of Hong Kong
Macromolecules | Year: 2012

Combining atom transfer radical polymerization and copper-catalyzed azide-alkyne "click" chemistry, hyperbranched copolymers with uniform poly(tert-butyl acrylate-b-styrene-b-tert-butyl acrylate) triblock copolymer subchains, denoted as hyper-(PtBA-PS-PtBA)n, were successfully prepared and characterized by size exclusion chromatography (SEC), FT-IR, and 1H NMR. Using laser light scattering, we first studied the intrachain contraction of ultralarge hyper-(PtBA36-PS55-PtBA 36)600 chains in cyclohexane, a solvent selectively poor for PS at lower temperatures. We found that at temperatures lower than 34 °C each PS block collapses into a small globule that was stabilized by its three neighboring PtBA blocks with no intrachain or interchain association in a dilute solution. Further, after hydrolyzing those tert-butyl (tBA) moieties into acrylic acids (AA), we comparatively studied the interchain association of linear triblock PAA23-PS14-PAA23 and its resultant hyper-(PAA23-PS14-PAA23)n with different overall molar masses in water. Our results reveal that larger hyperbranched chains have a less tendency to undergo the interchain association, and the average aggregation number (Nagg) is scaled to the weight-average degree of polycondensation [(DP)w], i.e., the number of linear triblock precursors inside each hyperbranched chain, as N agg ∼ (DP)w -0.7. As expected, increasing salt (NaCl) concentration led to stronger interchain association, resulting in large aggregates, while linear precursors only form small polymeric micelles. Moreover, our rheological study shows, unlike their linear precursor, large hyper-(PAA23-PS14-PAA23)n chains can form a physical gel with a network-like structure at a concentration as low as 50 g/L, whose modulus increases with (DP)w. © 2012 American Chemical Society.

Yang H.,Shanghai Normal University | Zhuang Y.,Shanghai Normal University | Hu H.,Shanghai Normal University | Du X.,Shanghai Normal University | And 5 more authors.
Advanced Functional Materials | Year: 2010

Monodisperse silica-coated manganese oxide nanoparticles (NPs) with a diameter of ∼35 nm are synthesized and are aminated through silanization. The amine-functionalized core-shell NPs enable the covalent conjugation of a fluorescent dye, Rhodamine B isothiocyanate (RBITC), and folate (FA) onto their surface. The formed Mn3O4@SiO2(RBITC)-FA core-shell nanocomposites are water-dispersible, stable, and biocompatible when the Mn concentration is below 50 μg mL-1 as confirmed by a cytotoxicity assay. Relaxivity measurements show that the core-shell NPs have a T1 relaxivity (r1) of 0.50 mm-1s-1 on the 0.5 T scanner and 0.47 mm-1S-1 on the 3.0 T scanner, suggesting the possibility of using the particles as a T1 contrast agent Combined flow cytometry, confocal microscopy, and magnetic resonance imaging studies show that the Mn3O4@SiO 2(RBITC)-FA nanocomposites can specifically target cancer cells overexpressing FA receptors (FARs). Findings from this study suggest that the silica-coated Mn3O4 core-shell NPs could be used as a platform for bimodal imaging (both magnetic resonance and fluorescence) in various biological systems. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Gu Q.,Donghua University
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi | Year: 2010

G-protein-coupled receptors (GPCRs), the largest family of cell surface receptors, play an important role in the production of therapeutic drugs. The functions of GPCRs are closely related to their classification and subclassification. It is difficult to obtain the spatial structure of GPCRs sequence by experimental approaches. It is highly desired to develop powerful tools and effective algorithms for classifying the family of GPCRs. In this study, based on the concept of pseudo amino acid composition (PseAA) originally introduced by Chou, approximate entropy (ApEn) of protein sequence as an additional characteristic is used to construct PseAA. A 21-D (dimensional) PseAA is formulated to represent the sample of a protein. Fuzzy K nearest neighbors (FKNN) classifier is adopted as prediction engine. The datasets in low homology are used to validate the performance of the proposed method. Compared with prior works, the successful rates achieved of our research are the highest. The test results indicate that the novel approach can play the role of a compliment to many of the existing methods, which promises to be a useful tool for GPCRs function prediction.

Liu H.,Henan Normal University | Liu G.,Henan Normal University | Liu G.,Guangdong University of Technology | Shi X.,Donghua University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2010

We firstly report an electrochemical approach to fabricating N/Zr-codoped TiO2 nanotube arrays for photocatalytic applications. In this approach, TiO2 nanotube arrays were first prepared by anodic oxidation using titanium anode and platinum cathode. Then the formed TiO2 nanotube arrays and Pt were used as cathode and anode, respectively for subsequent formation of N/Zr-codoped TiO2 nanotube arrays through an electrochemical process in the presence of a solution of Zr(NO3)4 and NH4Cl. The morphology and composition of the N/Zr-codoped nanotube arrays were characterized using field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffusion reflection spectroscopy (UV-vis DRS). The photocatalytic activities of the N/Zr-codoped TiO2 nanotube arrays were evaluated by the degradation of a model dye, rhodamine B. We show that the codoping with N and Zr elements significantly improves the photocatalytic efficiency of TiO2 nanotube arrays under both UV and visible light irradiation. XPS analysis suggests that the N impurities are interstitially doped into the TiO2 lattice, also enhancing the visible light sensitivity. Findings from this study suggest that through a simple codoping approach, TiO2 nanotube arrays with enhanced photocatalytic activity can be fabricated, thereby opening a new pathway to construct nanostructured TiO2-based composite materials for photocatalytic applications. © 2010 Elsevier B.V.

Fu H.M.,Donghua University
Materials Research Innovations | Year: 2015

Pressure drop is one of the principal performances of the fibrous filtration medium. Traditional computational studies in this area are based on typical unrealistic two-dimensional geometries, with the fibre just placed in a lattice perpendicular to the flow. So in this paper, a threedimensional virtual fibrous material was developed by means of visual basic application. In the virtual fibrous material, the fibres were arranged randomly by computer and the flow field of virtual fibrous material was calculated. The influence of constructive parameters on pressure drop and permeability was investigated. Simulation shows that flow field velocity distribution was not symmetric. Filtration velocity decreased when the air flew through the fibres, whereas the fluid velocity increased significantly when the distance between fibres was large. Obvious vortex formed in the fibre space areas. The pressure drop was tested experimentally, and the result was compared with that of theoretical and semi-empirical formula calculation. Experimental and simulation data were in agreement with Davies' empirical formula. The simulation result reveals that the pressure drop of fibrous medium increased linearly with the increase of filtration velocity. Moreover, pressure drop non-linearly increased with the increasing solid volume fraction. Simulation results of pressure drop were in good agreement with the predictions of Davies' empirical formula. © W. S. Maney & Son Ltd 2015.

Liu J.,CAS Shanghai Institute of Organic Chemistry | Chu L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Organic Letters | Year: 2013

A CH3COCl-promoted allylic trifluoromethylthiolation of allylsilanes with trifluoromethanesulfanamide has been described. The method allows for an efficient synthesis of a wide range of allylic trifluoromethylthiolated compounds under mild conditions. © 2013 American Chemical Society.

Li L.,Hefei University of Technology | Yang J.,Hefei University of Technology | Zhou J.,Donghua University
Macromolecules | Year: 2013

Combining atom transfer radical polymerization (ATRP) and "click" chemistry, a set of well-defined amphiphilic block copolymers poly(n-butyl acrylate)-b-poly(acrylic acid) (PnBA20-PAA85) with a similar chemical component, but different topological structures, i.e., linear-, cyclic-, and multiblock structures, were successfully prepared, characterized (size exclusion chromatography (SEC), FT-IR and 1H NMR), and used as surfactants in emulsion polymerization. Our further transmission electron microscopy (TEM) and laser light scattering (LLS) characterization of the resultant latex particles demonstrates all the surfactants with different topologies can effectively stabilize the latex particles but no significant difference among the solids contents was observed. Moreover, we have, for the first time, experimentally established the quantitative relation between the final number of latex particles (Np) and the concentration of polymeric surfactant with different topologies (C), i.e., Np = kCα, and the order of our measured exponent α is as follows: αmulti(1.10) > αlinear(0.81) ≥ αcyclic(0.73), indicating cyclic surfactant molecules behave more like small-molecule surfactants attributed to its strongest unimers extraction and diffusion ability; in contrast, multiblock surfactant molecules can act as seeds to directly nucleate to create latex particles. In addition, Np,multi > Np,linear ≥ Np,cyclic at higher concentration, and Np,linear > Np,cyclic ≥ Np,multi at lower concentration was observed. Similar results (αmulti(1.02) > αlinear(0.65) ≥ αcyclic(0.58)) were also observed when polystyrene-b- poly(acrylic acid) (PS9-PAA60) copolymers were used as surfactants. Further aqueous SEC characterization shows the broad size distribution of our micellar solution has no effect on obtaining narrowly distributed latex particles. Finally, interfacial tension measurement of the micellar solution indicates, compared to multiblock structure, the rate of adsorption at a hydrophobic interface is much faster for linear and cyclic-block structures, agreeing with our observed order of exponent α. © 2013 American Chemical Society.

Prasanthkumar S.,RIKEN | Zhang W.,RIKEN | Jin W.,Donghua University | Fukushima T.,Tokyo Institute of Technology | And 2 more authors.
Angewandte Chemie - International Edition | Year: 2015

Novel hexa-peri-hexabenzocoronene (HBC) derivatives, FHBC and FHBC*, which carry perfluoroalkyl segments on one side of the HBC core and long alkyl tails on the other, were synthesized. Their perfluoroalkyl segments are highly solvated in C6F6 (solvophilic effect) and do not assemble, whereas in CH2Cl2, they are excluded (solvophobic effect) and assemble together consequently. For example, the use of C6F6 and CH2Cl2 as assembling media for FHBC leads to the selective formation of single- and multi-walled nanotubes, respectively. When a higher monomer concentration is applied in CH2Cl2, multi-walled nanotubes with a larger number of walls result. FHBC in CH2Cl2 self-assembles rather slowly, thereby allowing for the observation of coil-on-tube structures, which are possible intermediates for the stepwise radial growth of the nanotubular wall. Casting of the multi-walled nanotubes onto a quartz plate yields a superhydrophobic thin film with a water contact angle of 161±2°. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Zhong Y.,Donghua University
Textile Research Journal | Year: 2010

The online purchase of garments is increasing and a method to enable accurate and immediate garment sizing could improve the customer's experience. A successful online garments shopping system should provide the capacity of dressing a given garment onto various posed human models with fit/ease information. In this paper, we present a method to "copy" the pose of a source human model to a target human model via a skeleton-matching algorithm. The skeleton is generated automatically according to the anthropometric features. The pose difference is compensated by an affine transformation applied to the skin vertices recursively. The final redressing is conducted according to benchmark matching and a penetration recovery procedure followed by a physical-based drape simulation. The fit evaluation is fulfilled through cutting the segmented human model with a serious of planes. The experimental results validate that this method is an effective approach for predicting dressing style with accurate fit/ease information. © The Author(s), 2010.

Su Y.,University of Mississippi | Su Y.,Donghua University | Gathitu B.B.,University of Mississippi | Gathitu B.B.,Jomo Kenyatta University of Agriculture and Technology | Chen W.-Y.,University of Mississippi
Fuel | Year: 2010

Potential substitutes of natural gas and lignite fly ash as NO and HCN reducing agents, respectively, for heterogeneous reburning were examined in a bench-scale apparatus equipped with a simulated reburning and a burnout furnace. Selection of NO reducing agent is based on fuel volatility and nitrogen functionality. HCN reducing agent selection is based on literature data. A wide range of waste materials and industrial by-products show overall NO reduction efficiency up to 88% at reburning stoichiometric ratio 0.90 or 0.95. Mixed fuel containing scrap tire and Fe2O3 is particularly effective. Though its cost is constrained by the energy-intensive operation of grinding the tire, the estimated raw-material cost is better than that of natural gas reburning and highly competitive against SCR. A first-level approximation study of the selectivities of nitrogen species to form NO in burnout zone reveals the importance of HCN and char nitrogen reaction mechanisms. © 2009 Elsevier Ltd. All rights reserved.

Sun J.,Donghua University | Wu L.,Heze University
Applied Surface Science | Year: 2014

This work proposes a novel approach for protein purification from solution using mixed matrix membranes (MMMs) comprising of hydroxyapatite (HAP) inside polyether sulfone (PES) matrix. The influence of HAP particle loading on membrane morphology is studied. The MMMs are further characterized concerning permeability and adsorption capacity. The MMMs show purification of protein via both diffusion as well as adsorption, and show the potential of using MMMs for improvements in protein purification techniques. The bovine serum albumin (BSA) was used as a model protein. The properties and structures of MMMs prepared by immersion phase separation process were characterized by pure water flux, BSA adsorption and scanning electron microscopy (SEM). © 2014 Elsevier B.V.

Wu Z.,Zhejiang University | Su H.,Zhejiang University | Chu J.,Zhejiang University | Zhou W.,Donghua University
IEEE Transactions on Neural Networks | Year: 2010

This brief investigates the problem of global exponential stability analysis for discrete recurrent neural networks with time-varying delays. In terms of linear matrix inequality (LMI) approach, a novel delay-dependent stability criterion is established for the considered recurrent neural networks via a new Lyapunov function. The obtained condition has less conservativeness and less number of variables than the existing ones. Numerical example is given to demonstrate the effectiveness of the proposed method. © 2006 IEEE.

Shen Q.,Donghua University
Proceedings - 3rd International Conference on Information Management, Innovation Management and Industrial Engineering, ICIII 2010 | Year: 2010

The diversity of service activities means that service innovations and innovation organizations may take various forms. In this paper we roughly but practically separate service-enhanced manufacturing enterprise organizations into three organization modes based on the literatures of former researches: strategy-oriented organization, professional organization and network organization according to the requirements of service-enhanced manufacturing industry. In order to select a suitable organization mode for a specific organization, we make a fuzzy comprehensive evaluation on these three organization modes based on a modified "7S" organization model suitable for service oriented organization. By this method, a service-enhanced manufacturing enterprise can find which one of these 7 factors is weak and should be improved. Finally the enterprise can optimize organization mode on the benefit to organizational strategic transformation. © 2010 IEEE.

Gao B.,Donghua University
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2015

A chemotaxis-haptotaxis model for cancer cell invasion of neighboring tissue is considered. There are three key variables: the cancer density, matrix degrading enzyme concentration and tissue density. Enzyme is produced by cancer cells themselves, undergoes decay, and is degraded upon contact issue. Firstly, based on the analysis of Δw expression, it gets pointwise lower-bound estimates of Δw. Secondly, by employing energy estimates and interpolation inequalities, it obtains L log L priori estimates of u under the assumption that the cell mass is less than a critical value. Moreover, Gagliardo-Nirenberg inequalities and energy integral methods are use to get to L2 ((Ω)-estimates of u. Then, the global existence and boundedness of solutions to the model is proved by using Moser's iteration. Finally, it is shown that the chemotaxis-haptotaxis model has a critical mass phenomenon in two-dimensional case.

Wang Z.,Donghua University | Wang Z.,Brunel University | Ho D.W.C.,City University of Hong Kong | Dong H.,Harbin Institute of Technology | And 2 more authors.
IEEE Transactions on Automatic Control | Year: 2010

This technical note addresses the robust H∞ finite-horizon output feedback control problem for a class of uncertain discrete stochastic nonlinear time-varying systems with both sensor and actuator saturations. In the system under investigation, all the system parameters are allowed to be time-varying, the parameter uncertainties are assumed to be of the polytopic type, and the stochastic nonlinearities are described by statistical means which can cover several classes of well-studied nonlinearities. The purpose of the problem addressed is to design an output feedback controller, over a given finite-horizon, such that the H∞ disturbance attenuation level is guaranteed for the nonlinear stochastic polytopic system in the presence of saturated sensor and actuator outputs. Sufficient conditions are first established for the robust H∞ performance through intensive stochastic analysis, and then a recursive linear matrix inequality (RLMI) approach is employed to design the desired output feedback controller achieving the prescribed H∞ disturbance rejection level. Simulation results demonstrate the effectiveness of the developed controller design scheme. © 2006 IEEE.

Zongyao H.,Henan University of Urban Construction | Zhou L.,Donghua University
International Journal of Advancements in Computing Technology | Year: 2011

A new real-coded quantum evolutionary algorithm is proposed in this paper. The new algorithm consists of trigonometric quantum individuals (TQIs) which are different from traditional quantum individuals design. The new TQIs specify two potential parallel structures; they can react upon each other in order to improve the efficiency of the new algorithm. In the course of evolution, the population executes high frequency mutation operation to keep its diversity, and then use the prior information which include optimal solution and gradient information of objective function to implement the update operation with acceleration mechanism. Numerical results indicate that this new algorithm has the characteristics of fast convergence rate, and good global search capability.

Jiang C.,Shanghai Business School | Song F.,Donghua University
Journal of Computers | Year: 2011

Chaotic time-series is a dynamic nonlinear system whose features can not be fully reflected by Linear Regression Model or Static Neural Network. While Nonlinear Autoregressive with eXogenous input includes feedback of network output, therefore, it can better reflect the system's dynamic feature. Take annual active times of sunspot as an example, after verifying the chaos of sunspot time-series and calculating the series' embedding dimension and delay, we establish sunspot prediction model with NARX network. The result shows that compared with BP Network and ARIMA Model, NARX network can better predict the chaos. © 2011 ACADEMY PUBLISHER.

Liu J.-B.,CAS Shanghai Institute of Organic Chemistry | Xu X.-H.,CAS Shanghai Institute of Organic Chemistry | Chen Z.-H.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Angewandte Chemie - International Edition | Year: 2015

An unprecedented reaction for the direct trifluoromethylthiolation and fluorination of alkyl alcohols using AgSCF3 and nBu4NI has been developed. The trifluoromethylthiolated compounds and alkyl fluorides were selectively formed by changing the ratio of AgSCF3/nBu4NI. This protocol is tolerant of different functional groups and might be applicable to late-stage trifluoromethylthiolation of alcohols. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA.

Yu W.,University of New South Wales | Zhang W.,University of New South Wales | Lin X.,University of New South Wales | Zhang Q.,CSIRO | Le J.,Donghua University
World Wide Web | Year: 2012

SimRank has become an important similarity measure to rank web documents based on a graph model on hyperlinks. The existing approaches for conducting SimRank computation adopt an iteration paradigm. The most efficient deterministic technique yields O(n 3) worst-case time per iteration with the space requirement O(n 2), where n is the number of nodes (web documents). In this paper, we propose novel optimization techniques such that each iteration takes O(min{n · m, n r}) time and O(n + m) space, where m is the number of edges in a web-graph model and r ≤ log 2 7. In addition, we extend the similarity transition matrix to prevent random surfers getting stuck, and devise a pruning technique to eliminate impractical similarities for each iteration. Moreover, we also develop a reordering technique combined with an over-relaxation method, not only speeding up the convergence rate of the existing techniques, but achieving I/O efficiency as well. We conduct extensive experiments on both synthetic and real data sets to demonstrate the efficiency and effectiveness of our iteration techniques. © 2010 Springer Science+Business Media, LLC.

Wang D.,Donghua University | Wang D.,Linkoping University | Tang O.,Linkoping University | Zhang L.,Tongji University
International Journal of Production Economics | Year: 2014

This paper examines a periodic-reviewed lot sizing problem with random yields, disruptions and limited inventory capacity. To characterise the continuous production, an additive random yield model is considered rather than a multiplicative one. Disruptions cause breakdowns to production. Inventory capacity is included since the production has to be shut down when the inventory buffer is full. Both disruptions and shutdowns lead to a start-up cost and a stochastic lead time to recover the production. These compound factors of uncertainty are encountered in practical planning decisions in process industries. We review the existing random yield models, which are then compared with the additive model. With a linear production cost, the additive model has an order-up-to policy to be optimal. Disruptions deteriorate the expected actual production quantity and the fill-rate dramatically, even though the optimal order-up-to level increases compared with the cases of no disruption. Considering inventory capacity makes the problem to be a non-convex dynamic programming problem. Numerical analysis shows that the performance is dramatically deteriorated when the inventory capacity is rather tight, which indicates the importance of selecting a proper inventory capacity to reduce the negative impacts and avoid redundant investment on capacity. Moreover, the start-up cost plays an important role in determining the level of inventory capacity. © 2014 Elsevier B.V. All rights reserved.

Fan H.,Donghua University
Wuli Xuebao/Acta Physica Sinica | Year: 2014

There have been many researches and rich results on the system risk in bank network systems that use complex network theory. Researches to date focus on the relationship between the contagion of the risk and the structure of the network after risk bursting, based on the assumptions that the accumulation of the system risk in network systems has approached the critical point of bursting and that the network is static (both the node and connection of the bank network are static). However, the problem why the system risk accumulates gradually and finally bursts in the network has not been addressed yet. The study on the system risk accumulation can only be conducted in dynamically evolving bank network systems; and the risk can be observed clearly only if the system risk is evaluated quantitatively. Therefore, a dynamically evolving complex bank network system, which has nodes of dynamic behavior and exhibits macroeconomic trends, is modelled first in the present paper. A lending-borrowing algorithm and a multi-term clearing algorithm for the dynamic bank network system are designed, and the method for calculating the system risk is proposed also. Finally, the system risk is calculated and analyzed by simulation. The curve of the system risk evolving with time is shown and the process of the accumulation of the system risk can be observed clearly. Researches in the present paper are to lay a foundation for the quantitative study of the system risk accumulation in dynamically evolving bank network systems. © Chinese Physical Society.

Wenliang X.,Donghua University
China Textile and Apparel | Year: 2016

China is the world's largest producer of cotton yarns and is enhancing its innovation capability in spinning. Thanks to the emerging smart manufacturing technologies, the development of spinning has evolved into a new phase. The focus of innovation will shift from equipment to processing in the Chinese spinning sector, and more new production lines with high productivity and short processing cycle will he introduced in the market.

Hosta-Rigau L.,University of Aarhus | Zhang Y.,University of Aarhus | Zhang Y.,Donghua University | Teo B.M.,University of Aarhus | And 2 more authors.
Nanoscale | Year: 2013

Cholesterol is a molecule with many tasks in nature but also a long history in science. This feature article highlights the contribution of this small compound to bionanotechnology. We discuss relevant chemical aspects in this context followed by an overview of its self-assembly capabilities both as a free molecule and when conjugated to a polymer. Further, cholesterol in the context of liposomes is reviewed and its impact ranging from biosensing to drug delivery is outlined. Cholesterol is and will be an indispensable player in bionanotechnology, contributing to the progress of this potent field of research. © 2013 The Royal Society of Chemistry.

Lei Y.,Donghua University
Applied Mechanics and Materials | Year: 2014

Mostly used in packing and outdoor facilities in the early stage, wood-plastic composites are gradually applied to other design sectors thanks to their advantageous features including cost efficiency, environmental protection, recyclability as well as being easy to be processed and fabricated. The application of this kind of green and new material in the exhibition design sector will be beneficial to developing the standardized structure and rapid fabrication in the exhibition design to save the project construction material costs and shorten erection time. In this article, the feasibility and ecological significance of using wood-plastic composites in the exhibition sector are explored from the aspects of the physical and chemical properties of the wood-plastic composites as well as their processing methods. © (2014) Trans Tech Publications, Switzerland.

Wang P.,Donghua University
Advanced Materials Research | Year: 2011

Woven fabrics are widely used in industry. In this paper, mechanical behaviors such as tear strength and stab strength of four kinds of woven fabric with different structural parameters were tested on Material Test System (MTS810.23). The tests were all conducted on both warp and weft directions. The failure morphologies of each woven fabric were observed to unveil the corresponding failure mechanisms.

Chen H.-M.,Wuhan Polytechnic University | Yu D.-G.,Donghua University
Journal of Materials Processing Technology | Year: 2010

An elevated temperature electrospinning process was developed for the preparation of drug-loaded polyacrylonitrile (PAN) ultrafine fibers. An additional apparatus for maintaining the electrospinning temperature at a high constant value was fitted on the syringe pump. Acyclovir (ACY)-loaded PAN fibers could be prepared from the co-dissolving dimethyl sulfoxide solutions of PAN and ACY at 80 °C. As the temperature increased, the viscosities and the surface tensions of the co-dissolving solutions decreased, whereas conductivities increased, which can account for the improved electrospinning ability of the solutions. 1H NMR analysis demonstrated that chemical integrity of ACY was maintained during the elevated temperature electrospinning process. The prepared ACY-loaded PAN ultrafine fibers had a smooth surface and uniform structure with no bead-on-a-string configurations. 94% of the fiber diameters fell within the range of 400-700 nm. The X-ray diffractograms and DSC results demonstrated that almost all the ACY was able to be distributed in the PAN fiber matrix in an amorphous status. The FTIR spectra demonstrated that PAN and ACY had sufficient compatibility due to hydrogen bonding. In vitro dissolution tests exhibited that the fibers could provide sustained drug release profiles over a time period of 16 h. The study demonstrates that an elevated temperature electrospinning process is able to broaden the processing window and enabling the preparation of new types of functional fibers with high quality. © 2010 Elsevier B.V.

Wu W.,Qiqihar University | Chen D.,Donghua University
Journal of Applied Polymer Science | Year: 2011

The purpose of this article is that the silica-modified SBR/BR blend replaces natural rubber (NR) in some application fields. The styrene-butadiene rubber (SBR) and cis-butadiene rubber (BR) blend was modified, in which silica filler was treated with the r-Aminopropyltriethoxysilane (KH-550) as a coupling agent, to improve mechanical and thermal properties, and compatibilities. The optimum formula and cure condition were determined by testing the properties of SBR/BR blend. The properties of NR and the silica-modified SBR/BR blend were compared. The results show that the optimum formulawas 80/20 SBR/BR, 2.5 phr dicumyl peroxide (DCP), 45 phr silica and 2.5 mL KH-550. The best cure condition was at 150°C for 25 min under 10 MPa. The mechanical and thermal properties of SBR/BR blend were obviously modified, in which the silica filler treated with KH-550. The compatibility of SBR/BR blend with DCP was better than those with benzoyl peroxide (BPO) and DCP/BPO. The crosslinking bonds between modified silica and rubbers were proved by Fourier transform infrared analysis, and the compatibility of SBR and BR was proved by polarized light microscopy (PLM) analysis. The silica-modified SBR/BR blend can substitute for NR in the specific application fields. © 2011 Wiley Periodicals, Inc.

Wang Q.-L.,Donghua University | He J.-H.,Soochow University of China | Li Z.-B.,Qujing Normal University
Thermal Science | Year: 2012

Time-fractional differential equations can accurately describe heat conduction in fractal media, such as woolfibers, goose down and polar bear hair. The fractional complex transform is used to convert time-fractional heat conduction equations with the modified Riemann-Liouville derivative into ordinary differential equations, and exact solutions can be easily obtained. The solution process is straightforward and concise.

Wang Z.,Tsinghua University | Wang Z.,Brunel University | Dong H.,Northeast Petroleum University | Dong H.,University of Duisburg - Essen | And 2 more authors.
IEEE Transactions on Automatic Control | Year: 2013

In this paper, a new H∞ filtering approach is developed for a class of discrete time-varying systems subject to missing measurements and quantization effects. The missing measurements are modeled via a diagonal matrix consisting of a series of mutually independent random variables satisfying certain probabilistic distributions on the interval [0,1]. The measured output is quantized by a logarithmic quantizer. Attention is focused on the design of a stochastic H∞ filter such that the H∞ estimation performance is guaranteed over a given finite-horizon in the simultaneous presence of probabilistic missing measurements, quantization effects as well as external non-Gaussian disturbances. A necessary and sufficient condition is first established for the existence of the desired time-varying filters in virtue of the solvability of certain coupled recursive Riccati difference equations (RDEs). Owing to its recursive nature, the proposed RDE approach is shown to be suitable for online application without the need of increasing the problem size. The simulation experiment is carried out for the mobile robot localization problem with non-Gaussian disturbances, missing measurements and quantization effects. The effectiveness of the proposed method is demonstrated in the numerical example. © 1963-2012 IEEE.

Yu D.-G.,University of Shanghai for Science and Technology | Williams G.R.,London Metropolitan University | Yang J.-H.,University of Shanghai for Science and Technology | Wang X.,University of Shanghai for Science and Technology | And 2 more authors.
Journal of Materials Chemistry | Year: 2011

A new strategy for manipulating molecular self-assembly to produce solid lipid nanoparticles (SLNs) in situ is reported. Microparticulate composites (consisting of the polymer PVP, naproxen and tristearin as a lipophilic carrier) were prepared using an elevated temperature electrospraying process. Tristearin/naproxen SLNs formed spontaneously when the composite microparticles were placed into water, as a result of the PVP polymer matrix dissolving. The self-assembled SLNs had average diameter of 376 ± 20 nm, a drug entrapment efficiency of 86.2% and provided sustained drug release over 24 h, with 87.6% of the total NAP freed into the dissolution medium in this time. These findings open a new route for developing novel biomaterials and nanoparticulate drug delivery systems, and for resolving problems associated with the formulation of poorly water-soluble drugs. © 2011 The Royal Society of Chemistry.

Zhang Q.-H.,Donghua University
Wuji Cailiao Xuebao/Journal of Inorganic Materials | Year: 2012

TiO 2 nanomaterials are the research hotspots among recent nanotechnologies, and those are demonstrated having the crucial application prospects in the solar light photocatalytic splitting water into hydrogen, the photocatalytic reduction of CO 2, as well as dye-sensitized solar cells. This article mainly reviewed recent research trends of TiO 2-based nanomaterials, the existing problems, and the advances in the clean energy utilization. Especially, the hot research issues such as non-metallic element doping, high energy facets exposed titania, and compact film for dye-sensitized solar cells, were commented and prospected.

Liu T.,Donghua University | Liu T.,Shanghai Geriatric Institute of Chinese Medicine | Cheng W.,Shanghai JiaoTong University | Huang Y.,University of Toulon | And 3 more authors.
Experimental Cell Research | Year: 2012

Currently, human induced pluripotent stem (iPS) cells were generated from patient or disease-specific sources and share the same key properties as embryonic stem cells. This makes them attractive for personalized medicine, drug screens or cellular therapy. Long-term cultivation and maintenance of normal iPS cells in an undifferentiated self-renewing state are a major challenge. Our previous studies have shown that human amniotic epithelial cells (HuAECs) could provide a good source of feeder cells for mouse and human embryonic stem cells, or spermatogonial stem cells, but the mechanism for this is unknown. Here, we examined the effect of endogenous microRNA-145 regulation on Sox2 expression in human iPS cells by HuAECs feeder cells regulation, and in turn on human iPS cells pluripotency. We found that human IPS cells transfected with a microRNA-145 mutant expressed Sox2 at high levels, allowing iPS to maintain a high level of AP activity in long-term culture and form teratomas in SCID mice. Expression of stem cell markers was increased in iPS transfected with the microRNA-145 mutant, compared with iPS was transfected with microRNA-145. Besides, the expression of Drosha proteins of the microRNA-processor complex, required for the generation of precursor pre-miRNA, was significantly increased in human iPS cells cultured on MEF but not on HuAECs. Taken together, these results suggest that endogenous Sox2 expression may be regulated by microRNA-145 in human iPS cells with HuAECs feeder cells, and Sox2 is a crucial component required for maintenance of them in an undifferentiated, proliferative state capable of self-renewal. © 2011 Elsevier Inc.

Hu J.M.,Donghua University
Advanced Materials Research | Year: 2014

Information visualization is more inclined to two-dimension design in traditional design field. As known to us all, it is unable to be applied in three-dimension. However, with the rapid development of design science, a growing number of people who are engaged in design have found that the application of information visualization can't be only restricted to graphic design as graphic design is gradually crossing with space design. Museums' display and design is part of display design. And long time of exhibition is the main character differing from the temporary exhibitions. As the chief carrier of mankind's cultural heritage, museums are visited and browsed by people and finally realize information's expression, acceptance and cognition. In this process, information is visualized. © (2014) Trans Tech Publications, Switzerland.

Duford D.A.,McGill University | Xi Y.,McGill University | Xi Y.,Donghua University | Salin E.D.,McGill University
Analytical Chemistry | Year: 2013

Pesticide residue is of concern as an environmental pollutant when present at medium to high concentrations. Such residue was quantified in both vegetable and soil samples by an enzyme inhibition technique. The multistep reactions were integrated into centrifugal microfluidic devices allowing automated simultaneous analysis of several samples or of replicates. The small sample size inherent to microfluidic devices allowed for less reagent to be used including less of the expensive enzyme which is key to this method. Liquid-solid magnetically actuated extraction, filtration, sedimentation, and detection were all integrated on the same device. Several parameters were optimized including the concentration of enzyme, substrate, chromatic agent, and reaction time. In this environmental application of centrifugal microfluidics, the percent inhibition of enzyme activity is logarithmically proportional to the demonstration pesticide concentration (in this case carbofuran). This meant that as the pesticide concentration increased in the samples, the reaction was more inhibited and the final product absorbed less light at 525 nm. Two versions of the centrifugal microfluidic devices were made. One version was designed for the analysis of vegetable samples (cabbage) and the other for the analysis of soil samples. Each version provided results that were statistically similar to the conventional benchtop method with a carbofuran limit of detection of 0.1 ppm or 0.1 μg g-1 (5 ng absolute limit of detection). © 2013 American Chemical Society.

He X.,Donghua University | Chen W.,University of Wollongong
Physica A: Statistical Mechanics and its Applications | Year: 2014

In this paper, we consider the pricing of the CDS (credit default swap) under a GMFBM (generalized mixed fractional Brownian motion) model. As the name suggests, the GMFBM model is indeed a generalization of all the FBM (fractional Brownian motion) models used in the literature, and is proved to be able to effectively capture the long-range dependence of the stock returns. To develop the pricing mechanics of the CDS, we firstly derive a sufficient condition for the market modeled under the GMFBM to be arbitrage free. Then under the risk-neutral assumption, the CDS is fairly priced by investigating the two legs of the cash flow involved. The price we obtained involves elementary functions only, and can be easily implemented for practical purpose. Finally, based on numerical experiments, we analyze quantitatively the impacts of different parameters on the prices of the CDS. Interestingly, in comparison with all the other FBM models documented in the literature, the results produced from the GMFBM model are in a better agreement with those calculated from the classical Black-Scholes model. © 2014 Published by Elsevier B.V. All rights reserved.

Tian-Hu H.,Donghua University
Journal of Mechanics of Materials and Structures | Year: 2015

This paper presents the relation between the Maxwell equations and the boundary conditions in piezoelectric and piezomagnetic fracture mechanics. In addition, considering that the case after deformation (current configuration in nonlinear elasticity) is very important for these conditions, the significance of them has been studied for this case. The application of them has also been researched. Moreover, the stress field of the solid material caused by the electric field has been discussed. In the conclusion, it is briefly discussed how to determine the crack open or not, which is of vital importance for semipermeable and impermeable boundary conditions. © 2015 Mathematical Sciences.

Xi Y.,Donghua University | Xi Y.,McGill University | Templeton E.J.,McGill University | Salin E.D.,McGill University
Talanta | Year: 2010

A centrifugal microfluidic device was developed for the rapid sequential determination of two critical environmental species, nitrate and nitrite, in water samples. The nitrate is reduced to nitrite and the nitrite is derivatized. The analytes are determined spectrophotometrically through the disc with a 1.4 mm pathlength. The detection limits are 0.05 and 0.16 mg L -1 for nitrite and nitrate respectively. The use of powdered reagents, the 100 μL sample required and the design of the device suggest that it would be suitable for field use. © 2010 Elsevier B.V. All rights reserved.

Chen J.,Georgia Institute of Technology | Yang J.,Georgia Institute of Technology | Yang J.,Chongqing University | Li Z.,Georgia Institute of Technology | And 10 more authors.
ACS Nano | Year: 2015

With 70% of the earths surface covered with water, wave energy is abundant and has the potential to be one of the most environmentally benign forms of electric energy. However, owing to lack of effective technology, water wave energy harvesting is almost unexplored as an energy source. Here, we report a network design made of triboelectric nanogenerators (TENGs) for large-scale harvesting of kinetic water energy. Relying on surface charging effect between the conventional polymers and very thin layer of metal as electrodes for each TENG, the TENG networks (TENG-NW) that naturally float on the water surface convert the slow, random, and high-force oscillatory wave energy into electricity. On the basis of the measured output of a single TENG, the TENG-NW is expected to give an average power output of 1.15 MW from 1 km2 surface area. Given the compelling features, such as being lightweight, extremely cost-effective, environmentally friendly, easily implemented, and capable of floating on the water surface, the TENG-NW renders an innovative and effective approach toward large-scale blue energy harvesting from the ocean. © 2015 American Chemical Society.

Zhang C.,Donghua University
Synlett | Year: 2012

(A) Witayakran and Ragauskas reported a one-pot aqueous synthesis of 1,4-naphthoquinone in the presence of laccase. Equation Presented. enediamine into 2,3-diaminophenazine in 90% yield under mild conditions.Equation Presented.(C) Sc(OTf)3/SDS and laccase were used as recyclable catalysts to efficiently and directly synthesize benzofuran derivatives from the reaction of catechols and acetylacetone.Equation Presented.(D) Kidwai et al. have described the mild laccase-catalyzed synthesis of an HIV protease inhibitor, substituted benzopyranocoumarin, in 65% yield.Equation Presented.(E) Pilz et al. reported a convenient synthesis of a novel compound, 4-[2-(2-carboxyethyl)-4,5-dihydroxy- phenylamino]benzoic acid, by laccase-catalyzed cross-coupling in 80% yield.11Equation Presented.(F) Proteins containing large amounts of lysine residues can react with dihydroxylated aromatics to form a three-dimensional network through oxidative cross-links in the presence of laccase. Equation Presented. © Georg Thieme Verlag Stuttgart New York.

Peng G.,Harbin Institute of Technology | Chen G.,Donghua University | Wu C.,Harbin Institute of Technology | Xin H.,Harbin Institute of Technology | Jiang Y.,Harbin Institute of Technology
Expert Systems with Applications | Year: 2011

A fixture is a special tool used to accurately and stably locate the workpiece during machining process. Proper fixture design improves the quality and production of parts and also facilitates the interchangeability of parts that is prevalent in much of modern manufacturing. This study combines the rule-based reasoning (RBR) and case-based reasoning (CBR) method for machining fixture design in a VR based integrated system. In this paper, an approach combines the RBR and fuzzy comprehensive judgment method is proposed for reasoning suitable locating schemes and locating features. Based on the reasoning results, a CBR method for machining fixture design is then presented. This method could help designers, by referencing previous design cases, to make a conceptual fixturing solution quickly. Finally, the implementation of proposed system is outlined and cases study has been used to demonstrate the applicability of the proposed approach. © 2010 Elsevier Ltd. All rights reserved.

Li J.,Zhejiang University | Li J.,Donghua University | Li J.,CAS Institute of Automation | Lu G.,Zhejiang University
Computers in Industry | Year: 2011

Improving the reusability of design results is very important for garment design industry, since designing an elegant garment is usually labor-intensive and time-consuming. In this paper, we present a new approach for customizing 3D garment models. Our approach can transfer garment models initially dressed on a reference human model onto a target human model. To achieve this goal, firstly a spatial mapping between the two human models is established with the shape constraints of cross-sections. Secondly, the space around the clothed reference human model is tetrahedralized into five tetrahedral meshes each of which either can be worked dependently with its adjacent ones or can be worked independently. The clothed reference human model is parametrically encoded in the tetrahedral meshes. Thirdly, these tetrahedral meshes are deformed by fitting the reference human model onto the target human model by using constrained volumetric graph Laplacian deformation. The updated garment models are finally decoded from the deformed tetrahedral meshes. As a result, the updated garment models are fitted onto the target human model. Experiments show that our approach performs very well and has the potential to be used in the garment design industry. © 2011 Elsevier B.V. All rights reserved.

Tao Z.,Yancheng Institute of Technology | Yan L.,University of Missouri | Qiao J.,Yancheng Institute of Technology | Qiao J.,Donghua University | And 4 more authors.
Progress in Materials Science | Year: 2015

Abstract This paper provides a comprehensive overview of developments and recent trends in H2 separation technology that uses dense proton-electron conducting ceramic materials and their associated membranes. Various proton-electron conducting materials and their associated membranes are summarized and classified into several important categories, such as Ni-composite proton-conducting materials, as well as tungstate-based, BaPrO3-based, LaGaO3-based, and niobate/tantalite composite metal oxide-based ceramic materials/membranes. Various membrane designs, including asymmetric ceramic membranes (supported and self-supported) and surface-modified membranes, are also reviewed. Several important properties of ceramic materials and membranes, such as proton and electron conductivity and performance (i.e., H2 transport flux and lifetime stability), are also discussed. To highlight the technical progress in this area, all possible ceramic materials and associated membranes are summarized, along with their properties and performance, to help readers quickly locate the information they are looking for. Based on this review, several challenges hindering the maturation of this technology are analyzed in depth, and possible research directions for overcoming these challenges are suggested. © 2015 Elsevier Ltd.

Zhao X.,Donghua University
Journal of the Textile Institute | Year: 2010

A durable phosphorus/silicon flame-retardant SP, which was applied on cotton fabric, was synthesized successfully with dimethyl phosphonate and methyl vinyl dichloride silane Its synthetic conditions were studied and chemical structure was confirmed by infrared spectroscopy (IR). In addition, application of the flame-retardant to the treatment of cotton fabrics was investigated. This flame-retardant system was based on polycarboxylic acids and acidic catalysts. An optimized procedure was determined by evaluating the various finishing conditions, such as flame-retardant dosage, cross-linking agent dosage, catalyst dosage, pH value of the finishing liquor, curing temperature and curing time, and the influence of additives on the effect of flame-retardant. When it was applied to the finishing of the cotton, a durable flame-retarding fabric was obtained. © 2010 The Textile Institute.

Jiang X.,CAS Shanghai Institute of Organic Chemistry | Chu L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Journal of Organic Chemistry | Year: 2012

Trifluoromethylated acetylenes and arenes are widely applicable in the synthesis of pharmaceuticals and agrochemicals. In 2010, our group has reported the copper-mediated oxidative trifluomethylation of terminal alkynes and aryl boronic acids. This method allows a wide range of functional group tolerant trifluoromethylated acetylenes and arenes to be easily prepared. After the preliminary mechanistic studies of the oxidative trifluoromethylation of terminal alkyne, an efficient copper-catalyzed oxidative trifluoromethylation of terminal alkynes and aryl boronic acids has been developed. The catalytic protocol is successfully achieved by adding both the substrate and a portion of CF 3TMS slowly using a syringe pump to the reaction mixture. © 2012 American Chemical Society.

He C.-Y.,Donghua University | Min Q.-Q.,CAS Shanghai Institute of Organic Chemistry | Zhang X.,CAS Shanghai Institute of Organic Chemistry
Organometallics | Year: 2012

We report a Pd-catalyzed aerobic dehydrogenative cross-coupling of polyfluoroarenes with thiophenes via 2-fold C-H functionalization. The advantages of this reaction are its high reaction efficiency, excellent functional group compatibility, and use of molecular O 2 as terminal oxidant. This reaction provides a useful and facile protocol for the preparation of polyfluoroarene-thiophene structure of interest in functional materials. Mechanistic studies revealed that the reaction is initiated by the C-H bond cleavage of polyfluoroarenes. © 2011 American Chemical Society.

Lin X.,CAS Shanghai Institute of Organic Chemistry | Zheng F.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Organometallics | Year: 2012

We report the first example of iron-catalyzed cross-coupling of α-halo-β,β-difluoroethylene-containing compounds with arylzinc reagents using TMEDA and dppp as coligands. The reaction affords a wide range of functional group tolerant gem-difluoromethylenated compounds in moderate to good yields. The facile dehalodefluorination of α-halo-β,β- difluoroethylene-containing compounds upon treatment of reductive metal reagents was mostly inhibited. Mechanistic studies indicated that the cross-coupling reaction could involve a single-electron-transfer process. © 2011 American Chemical Society.

Xie F.,Donghua University
Tijdschrift voor Urologie | Year: 2014

In this paper we investigate an interface problem with singular perturbation on a subinterval. We first establish a lemma of lower and upper solutions which is an extension of the classical theory of lower and upper solutions. Based on the basic lemma we obtain the existence of a solution to the proposed problem, and the asymptotic behavior of solution as the singular perturbation parameter ε→0+ as well. © 2014, Xie; licensee Springer.

He J.-H.,Soochow University of China | He J.-H.,Donghua University
Meccanica | Year: 2011

A variational principle is established using the semi-inverse method for the foam drainage equation. © 2010 Springer Science+Business Media B.V.

Faraz N.,Donghua University
Computers and Mathematics with Applications | Year: 2011

In this paper the problem of the porous slider where the fluid is injected through the porous bottom is considered. The similarity transformation reduces the governing equations into coupled nonlinear ordinary differential equations. The resulting equations are solved by using He's variational iteration algorithm-II. The resulting series solution contains the well known Reynolds number. The influence of the Reynolds number on the velocity field has been discussed graphically. © 2010 Elsevier Ltd. All rights reserved.

Li M.,Donghua University
Journal of the Textile Institute | Year: 2015

This study focuses on the effect of various distances between the jet orifice and the nozzle Alex on the properties of the vortex spun yarn. Four levels of the distance are designed within certain range. Building three-dimensional computational fluid dynamics models, we use the method of numerical simulation to calculate the inner fluid field of nozzle. The results showed that the distance typically affected the airflow movements, particularly in tangential velocity, and the smaller d is beneficial to diffuse the airflow uniformly and to improve the quality of vortex spun yarn. The corresponding experiments have been carried out. In this paper, 100% viscose drawing slivers are spun into vortex spun yarn, and their physical properties are tested. Spinning experiment results prove that when the distance is minimum under the condition of avoiding the high-speed airflow shooting out from the jet orifices colliding with the cone body, the yarn strength reaches the maximum value, while the unevenness of breaking strength meets the minimum, and the other yarn properties are superior, which shows a good agreement with the simulation results. © 2015 The Textile Institute

Chen M.,Donghua University
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2014

Through the pratical teaching of linear algebra, the roles of linear equations system are considered. The applications of linear equations system are introduced in three aspects:the applications in the vector concept, the dimension of solution space and the discussion of linear dependent. By introducing linear equations on teaching, the learning enthusiasm of students is improved and better teaching effect is obtained.

Khan Y.,Zhejiang University | Wu Q.,Zhejiang University | Faraz N.,Donghua University | Yildirim A.,Ege University
Computers and Mathematics with Applications | Year: 2011

The effects of variable viscosity and thermal conductivity on the flow and heat transfer in a laminar liquid film on a horizontal shrinking/stretching sheet are analyzed. The similarity transformation reduces the time independent boundary layer equations for momentum and thermal energy into a set of coupled ordinary differential equations. The resulting five-parameter problem is solved by the homotopy perturbation method. The results are presented graphically to interpret various physical parameters appearing in the problem. © 2011 Elsevier Ltd. All rights reserved.

Lu A.,Donghua University
Journal of Nanomaterials | Year: 2014

The adsorption of a C60 molecule on the graphene revealed the contribution of a conductor-semiconductor transition, based on a theoretical calculation. A stress or a strain was predicted as a possible reason to tune the transition backwards. © 2014 Lu Aijiang.

Fan Y.,Tohoku University | Estili M.,Japan National Institute of Materials Science | Igarashi G.,Tohoku University | Jiang W.,Donghua University | Kawasaki A.,Tohoku University
Journal of the European Ceramic Society | Year: 2014

Fully dense few-layer graphene (FG)/Al2O3 nanocomposites with homogeneously dispersed FG in matrix are prepared by using a heteroaggregation method followed by spark plasma sintering. It is found that the two dimensional FG has great ability to restrain grain growth in comparison to other inclusions. In addition, the morphology of grain in composite is modified by the addition of FG during densification process compared with monolithic alumina. Thanks to the greatly decreased grain size, the composites are almost as hard as monolithic alumina at low sintering temperature (1573K) even if graphene content is as high as 1.2vol.%. However, at higher sintering temperature (1673K), the hardness of composites decreases further but the change in elastic modulus is very limited. The decline of hardness and elastic modulus mainly arises from the sliding feature of FG, low modulus of reduced graphene oxide in both in-plane and out-of-plane directions. © 2013 Elsevier Ltd.

Qiao J.,Donghua University | Zhang J.,Donghua University | Zhang J.,National Research Council Canada
Journal of Power Sources | Year: 2013

Novel and highly durable alkaline anion-exchange membranes, PVA/PDDA-OH-, are synthesized using a combined thermal and chemical cross-linking method. In the synthesis, poly(vinyl alcohol) (PVA) is used as polymer matrix and poly(diallyldimethylammonium chloride) (PDDA) as anion charge carriers. The resulting membrane exhibits a high hydroxide conductivity of 0.025 S cm-1 at a polymer composition PVA/PDDA being 1:0.5 by mass. A promising H2/O2 fuel cell peak power density of 32.7 mW cm-2 is reached for MEA fabricated with this PVA/PDDA-OH- at 25 °C. The membrane also shows a strong alkaline stability in 8 M KOH at 80 °C for 360 h. This is considered a new record for the fully cation-free hydrocarbon membranes for the use in alkaline fuel cell, seeing that PVA/PDDA-OH- is made simply of aliphatic skeletons. © 2013 Elsevier B.V. All rights reserved.

Zhang L.L.,University of Texas at Austin | Zhao X.,University of Texas at Austin | Zhao X.,Donghua University | Ji H.,University of Texas at Austin | And 7 more authors.
Energy and Environmental Science | Year: 2012

Many researchers have used nitrogen (N) as a dopant and/or N-containing functional groups to enhance the capacitance of carbon electrodes of electrical double layer (EDL) capacitors. However, the physical mechanism(s) giving rise to the interfacial capacitance of the N-containing carbon electrodes is not well understood. Here, we show that the area-normalized capacitance of lightly N-doped activated graphene with similar porous structure increased from 6 μF cm -2 to 22 μF cm -2 with 0 at%, and 2.3 at% N-doping, respectively. The quantum capacitance of pristine single layer graphene and various N-doped graphene was measured and a trend of upwards shifts of the Dirac Point with increasing N concentration was observed. The increase in bulk capacitance with increasing N concentration, and the increase of the quantum capacitance in the N-doped monolayer graphene versus pristine monolayer graphene suggests that the increase in the EDL type of capacitance of many, if not all, N-doped carbon electrodes studied to date, is primarily due to the modification of the electronic structure of the graphene by the N dopant. It was further found that the quantum capacitance is closely related to the N dopant concentration and N-doping provides an effective way to increase the density of the states of monolayer graphene. © 2012 The Royal Society of Chemistry.

Gao P.,Donghua University | Gao P.,Michigan State University | Munir M.,Michigan State University | Xagoraraki I.,Michigan State University
Science of the Total Environment | Year: 2012

Antibiotics and corresponding resistance genes and resistant bacteria have been considered as emerging pollutants worldwide. Wastewater treatment plants (WWTPs) are potential reservoirs contributing to the evolution and spread of antibiotic resistance. In this study, total concentrations of tetracycline and sulfonamide antibiotics in final effluent were detected at 652.6 and 261.1ng/L, respectively, and in treated sludge, concentrations were at 1150.0 and 76.0μg/kg dry weight (dw), respectively. The quantities of antibiotic resistance genes and antibiotic resistant bacteria in final effluent were quantified in the range of 9.12×10 5-1.05×10 6 gene abundances /100mL (genomic copies/100mL) and 1.05×10 1-3.09×10 3CFU/mL, respectively. In treated sludge, they were quantified at concentrations of 1.00×10 8-1.78×10 9 gene abandances/100mL and 7.08×10 6-1.91×10 8CFU/100mL, respectively. Significant reductions (2-3 logs, p<0.05) of antibiotic resistance genes and antibiotic resistant bacteria were observed between raw influent and final effluent. The gene abundances of tetO and tetW normalized to that of 16S rRNA genes indicated an apparent decrease as compared to sulI genes, which remained stable along each treatment stage. Significant correlations (R 2=0.75-0.83, p<0.05) between numbers of resistant bacteria and antibiotic concentrations were observed in raw influent and final effluent. No significance (R 2=0.15, p>0.05) was found between tet genes (tetO and tetW) with concentration of tetracyclines identified in wastewater, while a significant correlation (R 2=0.97, p<0.05) was observed for sulI gene and total concentration of sulfonamides. Correlations of the quantities of antibiotic resistance genes and antibiotic resistant bacteria with corresponding concentrations of antibiotics in sludge samples were found to be considerably weak (R 2=0.003-0.07). © 2012 Elsevier B.V.

Guo C.,CAS Shanghai Institute of Organic Chemistry | Wang R.-W.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University
Journal of Fluorine Chemistry | Year: 2012

The palladium-catalyzed direct α-arylations of α,α- difluoroketones with diverse aryl bromides have been developed by using rac-BINAP as ligand and Cs 2CO 3 as a mild base in xylene. This method provides an efficient and straightforward access to a variety of α-aryl-α,α-difluoroketones with broad substrate scope. © 2012 Elsevier B.V. All rights reserved.

Chen X.-G.,Donghua University | Chen X.-G.,Zhejiang University | Zheng P.,Zhejiang University | Qaisar M.,University | Tang C.-J.,Zhejiang University
Bioresource Technology | Year: 2012

Dynamic behavior and concentration distribution of granular sludge is highly dependent on the ecological environment of microbial communities and substrate degradation efficiency along bed height. Both were modeled and verified through experiments in a super-high-rate spiral anaerobic bioreactor (SSAB). The sludge transport efficiency of upmoving biogas (k t, n-1) displaying dynamic behavior of granular sludge in SSAB were predicted and found to be much lesser than of upflow anaerobic sludge blanket (UASB). The bed concentration distribution (C m, n-1/C m, n) which represented concentration distribution of granular sludge were also quantitatively predicted in two feeding strategies. Parametric sensitivity suggested that k t, n-1 was significantly influenced by spiral angle, outer radii of spiral rectangular channel, settling velocity of granular sludge and superficial liquid velocity (v l), while C m, n-1/C m, n was affected by v l and superficial biogas velocity. In addition, some measures were also suggested to optimize designs and operations of such bioreactors. © 2012 Elsevier Ltd.

Li Z.,Donghua University
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi | Year: 2012

Bacterial cellulose (BC) was prepared by Acetobacter xylinum in static culture. After purified by chemical treatment, the microstructure, chemical structure, crystal structure and mechanical property of BC were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD) and tensile strength measurement respectively, and compared with those of the imported bacterial cellulose wound dressing served as control sample (XBC). The results indicated that the diameter of the BC was (22 +/- 9) nm, and the crystallinity index was 89.71%. The tensile strength and the Young's mouduls of BC were significant higher than XBC both in wet and dry states. The biocompatibility of BC and XBC were evaluated by cytotoxicity test, delayed contact sensitization study in the Guinea Pig and skin irritation test. The results showed that BC had reliable biocompatibility as well as XBC. With the unique nanostructure, high crystallinity, high mechanical strength, and reliable biocompatibility, BC produced in our country as well as XBC can be used as a safe biomaterial for the medical applications.

Xu H.,University of Nebraska - Lincoln | Shen L.,Donghua University | Xu L.,University of Nebraska - Lincoln | Yang Y.,University of Nebraska - Lincoln
Biomedical Microdevices | Year: 2015

In this research, controlled delivery of hollow nanoparticles from zein, the corn storage protein, to different organs of mice was achieved via crosslinking using citric acid, a non-toxic polycarboxylic acid derived from starch. Besides, crosslinking significantly enhanced water stability of nanoparticles while preserving their drug loading efficiency. Protein nanoparticles have been widely investigated as vehicles for delivery of therapeutics. However, protein nanoparticles were not stable in physiological conditions, easily cleared by mononuclear phagocyte system (MPS), and thus mainly accumulated and degraded in spleen and liver, the major MPS organs. Effective delivery to major non-MPS organs, such as kidney, was usually difficult to achieve, as well as long resident time of nanoparticles. In this research, hollow zein nanoparticles were chemically crosslinked with citric acid. Controlled delivery and prolonged accumulation of the nanoparticles in kidney, one major non-MPS organ, were achieved. The nanoparticles showed improved stability in aqueous environment at pH 7.4 without affecting the adsorption of 5-FU, a common anticancer drug. In summary, citric acid crosslinked hollow zein nanoparticles could be potential vehicles for controllable delivery of anticancer therapeutics. © 2015, Springer Science+Business Media New York.

Guo C.,CAS Shanghai Institute of Organic Chemistry | Wang R.-W.,CAS Shanghai Institute of Organic Chemistry | Guo Y.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,CAS Shanghai Institute of Organic Chemistry | Qing F.-L.,Donghua University