Fuzhou, China
Fuzhou, China

Fuzhou University is a university located in Fuzhou, China. Split into two campuses by the Min River, Fuzhou University's Old Campus is located on the north bank of the river in the western part of Fuzhou City, while the New Campus is located on the edge of the city on the south bank, at the base of Qi Mountain.The university excels in the fields of science and engineering nationally. It also has similar nationally recognized programs such as economics, management, arts and law. The university is part of the PRC national policy called Project 211 to enhance the development of the tertiary education system in mainland China. Wikipedia.

Time filter

Source Type

Qin J.,Fuzhou University | Wang S.,Fuzhou University | Wang X.,Fuzhou University
Applied Catalysis B: Environmental | Year: 2017

The nanomorphology of ZIFs strongly influences or even improves chemical properties of the metal-organic materials. Nanosized rhombic dodecahedral ZIF-67 crystals were successfully synthesized through a simple co-precipitation method at room temperature, and fully characterized by XRD, FT-IR, DRS, XPS, TEM, SEM, TGA and N2/CO2 sorption measurements. The as-prepared ZIF-67 material was applied to be an efficient heterogeneous co-catalyst for the photocatalytic CO2 reduction by cooperating with a ruthenium-based dye as a photosensitizer under mild reaction conditions. Under the optimal reaction conditions, the photocatalytic CO2 reduction system achieved a superior catalytic performance with a CO generation rate of 37.4 μmol/30 min, which was much higher than that of other types of MOFs. The carbon source of the evaluated CO was confirmed by 13CO2 isotopic experiment. The stability and reusability of the ZIF-67 co-catalyst in the reaction system were also examined. The present work provides new insights in the developments of nanoscale ZIFs materials for photocatalytic application. © 2017 Elsevier B.V.

Lunagariya J.,Jinan University | Dhar A.,University of Calcutta | Vekariya R.L.,Fuzhou University
RSC Advances | Year: 2017

The efficiency in the catalytic performance of halogen free functionalized room-temperature Brönsted acidic ionic liquids (BAILs), having different acidities (due to the ILs containing zero, a single, and or a double -SO3H functional group), for the esterification of n-butanol with acetic acid under various reaction conditions was investigated. The synthesized BAILs have much weaker corrosiveness than that of H2SO4. The nature of both counter anion and cation as well as the presence of additional functional (-SO3H) groups influenced the behavior of the catalyst. Interestingly, the acidic character of the ILs facilitates the reaction under extremely mild conditions, with a short reaction time, and reduction in the side reactions; moreover, the liquid-liquid biphasic reaction mode leads to good yields. The physicochemical properties of these BAILs were characterized by a variety of different analytical and spectroscopic techniques, such as NMR, FT-IR, mass spectrometry, TGA, and UV-vis spectroscopy for the determination of Hammett acidity. In particular, IL-5 having the highest acidity demonstrated excellent catalytic activity for esterification. An additional advantage of BAILs is the simple procedure for the separation of product and catalyst, where the catalysts can be easily recycled without the loss of catalytic activities, making IL-5 an important alternative catalyst for a commercially viable esterification process. © 2017 The Royal Society of Chemistry.

Yu X.-J.,Fuzhou University | Wu C.-T.,National Kaohsiung Normal University
Proceedings of the IEEE International Conference on Advanced Materials for Science and Engineering: Innovation, Science and Engineering, IEEE-ICAMSE 2016 | Year: 2016

This research focuses on developing a psychology-based evaluation procedure for emotional clips in films. For identifying thetrends of editing frequencies and achieving the attractive emotional clips design, we introduce the Kano model to construct the evaluation model. Films not only through images, soundtracks and other audio-visual means to convey a variety of emotions to the audience, but also by the frequency of the clip to help the audiences share the emotions expressed therein. Based on the montage theory, the authors try to make a data-based analysis of editing frequencies. With film clips selected from the past decade or so, the author tries to identify changes in the editing frequencies of emotion clips from the perspective of development and evaluate the emotional clips, so as to provide feasible evaluation process and valuable reference for editing of emotion clips in film post-production. © 2016 IEEE.

Derrien M.,Sejong University | Yang L.,Fuzhou University | Hur J.,Sejong University
Water Research | Year: 2017

Understanding the dynamics of organic matter (OM) and the roles in global and local carbon cycles is challenging to the fields of environmental sciences and biogeochemistry. The accurate identification of OM is an essential element to achieve this goal. Lipids, due to their ubiquitous presence and diagenetic and chemical stability, have long and successfully been used as molecular makers in assessing the sources and the fate of OM in natural environments. In parallel, optical properties of dissolved organic matter (DOM) have been suggested as efficient tools in tracing OM sources. In this review, three representative lipid biomarkers and several common spectroscopic indices were compared for their capabilities to identify OM sources in various aquatic environments. Spectroscopic indices present various benefits in term of the high sensitivity, easy and rapid analysis, and a low cost, providing reliable information on major sources (i.e., autochthonous, allochthonous and anthropogenic) of DOM in given systems investigated. However, for further understanding the associated biogeochemistry (e.g., diagenetic changes in sources), using biomarkers is preferable due to their abilities to identify a wide spectrum of different sources simultaneously as well as their high resolution for mixed OM sources. Thus, a complementary use of both tools is highly recommended for accurately tracking OM sources and the dynamics in aquatic systems, particularly in a watershed affected by multiple sources. Nevertheless, future studies need to be carried out (1) to refine the accuracy of the source assignments in a wide range of settings along with the development of an extensive database encompassing various sources, environmental factors, and geographical locations and (2) to understand how biogeochemical processes reflect the biomarkers and the spectroscopic indices used. © 2017 Elsevier Ltd

Zhong J.,Fuzhou University | Zhong S.,Fuzhou University | Zhang Q.,Fuzhou University
Structural Control and Health Monitoring | Year: 2017

An optical measurement system, which is capable of vibration measurement and response-only experimental modal analysis for beam-like structures, is reported by taking the concept of 2-dimensional optical coherence vibration tomography technique. In the proposed approach, it requires only quasi-interferogram fringe patterns as sensors and a high-speed camera as a detector. Experimental results of beam-like structures subjected to swept and harmonic excitations are demonstrated. The key advantage of the proposed method is the high spatial and temporal resolution with simultaneously measuring the absolute displacement of multiple points along the beam-like structures without point-by-point optical scanning. Without any vibration excitation information, the quasi-optical coherence vibration tomography technique system can capture structural modal parameters. Therefore, it is a response-only experimental modal analysis method, making it attractive for the structural health monitoring applications in the multiple-point measurement of real engineering structures with the absence of vibration input information. © 2017 John Wiley & Sons, Ltd.

Zhou N.,Fuzhou University | Chen B.,Fuzhou University
Proceedings - 2016 6th International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2016 | Year: 2016

Generally, well-constructed gene regulatory models can serve as a blueprint for researchers to understand the complex regulatory relationships among genes. Since the traditional models and methods for network construction are with low accuracy, and do not reveal detailed mechanisms among in-cell substances related to gene regulation, we present here a new dynamic model of gene regulation with reference to multisource biological information. The effectivity of our proposed method is verified by applying it to a collection of genes in the yeast genome. The experimental result shows that our model is capable to discover new interaction related to gene regulation. © 2016 IEEE.

Wang D.,Fuzhou University | Albero J.,Polytechnic University of Valencia | Garcia H.,Polytechnic University of Valencia | Li Z.,Fuzhou University
Journal of Catalysis | Year: 2017

MIL-100(Fe) and MIL-68(Fe), two Fe-based MOFs, were found to be active for oxidative condensation between alcohols and o-aminothiophenols to form 2-substituted benzothiazoles under visible light irradiation using oxygen (O2) as oxidant. This reaction can be applied to a wide range of substrates with medium to high yield. Controlled experiments and ESR results revealed a superoxide radical (O2 -)-mediated pathway, which is derived from the reduction of O2 by photogenerated Fe2+ on Fe–O clusters. The whole multistep reaction is limited by the step of the photo-oxidation of alcohols to aldehydes. MIL-100(Fe) showed catalytic performance superior to that of MIL-68(Fe) because its higher concentration of long-lived (μs time scale) positive holes can be photogenerated over MIL-100(Fe), in contrast to MIL-68(Fe). This study not only provides an economical, sustainable, and thus green process for the production of 2-substituted benzothiazoles, but also illustrates the potential of using transient absorption spectroscopy as an important tool for understanding the photophysics of MOFs, which are believed to show great potential as multifunctional catalysts for light-induced organic transformations. © 2017 Elsevier Inc.

Xia Y.,Fuzhou University | Wei Q.,Fuzhou University
ICALIP 2016 - 2016 International Conference on Audio, Language and Image Processing - Proceedings | Year: 2016

The Kalman filtering algorithm for speech enhancement is easily implemented and is efficient under white noise environments. This paper proposes an effective Kalman filtering algorithm for enhancing speech corrupted by colored noise, based on a whitened matrix. Compared with the conventional Kalman filtering algorithms to handle colored noise, the proposed Kalman filtering algorithm has low computational complexity and overcomes the difficulty of estimating the covariance matrix of colored noise. Simulation results confirm that the proposed Kalman filtering algorithm has better performance than several conventional algorithms in decreasing colored noise and speech distortion. © 2016 IEEE.

Chen B.,Fuzhou University | Hu X.,Jinling Institute of Technology
Journal of Nanomaterials | Year: 2017

On account of minimally invasive procedure and of filling irregular defects of tissues, injectable hydrogels are increasingly attractive in biomedical fields. However, traditional hydrogel formed by simple physical interaction or in situ crosslinking had inevitably some drawbacks such as low mechanical strength and lack of multifunctional properties. Though many investigations had successfully modified traditional injectable hydrogel to obtain both mechanical and functional properties, an acetalated β-cyclodextrin (Ac-β-CD) nanoparticle composite injectable hydrogel designed in the research was another effective and efficient choice to solve the drawbacks. First of all, gelatin derivative (G-AA) and Ac-β-CD were synthesized to prepare hydrogel and nanoparticle, respectively. In order to ensure good compatibility between nanoparticle and macromonomer and provide crosslink points between nanoparticle and macromonomer, G-AA was simultaneously functionalized onto the surface of Ac-β-CD nanoparticle during the fabrication of Ac-β-CD nanoparticle using one-step method. Finally, injectable composite hydrogel was obtained by photoinitiated polymerization in situ. Hydrogel properties like gelation time and swelling ratio were investigated. The viscoelastic behavior of hydrogels confirmed that typical characteristics of crosslinked elastomer for all hydrogel and nanoparticle in hydrogel could improve the mechanical property of hydrogel. Moreover, the transparency with time had verified obvious acid-response properties of hydrogels. © 2017 Baoguo Chen and Xiaohong Hu.

LiNi0.5Co0.2Mn0.3O2 cathode material synthesized by a sol-gel method was surface-modified by double-layer coating. The results of X-ray diffraction (XRD) confirm that the intrinsic structure was no change after surface modification. A double-layer structure consisting of an inner V2O5 (VO) layer and an outer conductive graphene oxide (GO) layer was coated on the surface of active material, as confirmed by transmission electron microscopy (TEM). The results of field emission scanning electron microscope (FE-SEM) equipped with an energy dispersive spectroscope (EDS) show that both graphene oxide and V2O5 uniformly covered LiNi0.5Co0.2Mn0.3O2 cathode material. The double-layer-coated LiNi0.5Co0.2Mn0.3O2 cathode material shows improved electrochemical performance with a capacity retention of 74.2% after 50 cycles in a range of 2.5–4.5 V at 55 °C, compared with only 67.8% capacity retention for the pristine material. In addition, the double-layer-coated LiNi0.5Co0.2Mn0.3O2 releases 116.6 mAh g−1 under a high current rate, while the pristine material only remains at 105.7 mAh g−1. The results can be ascribed to the double coating layer not only avoids the side reaction between electrolyte and active material but also promotes Li+ and electronic conductivity. Differential capacity (dQ/dV) and electrochemical impedance spectroscopy (EIS) measurements reveal that the double coating layer effectively suppresses the increase of the electrode polarization during cycling. © 2017 Elsevier B.V.

Chen Q.,Fuzhou University | Cai D.,Fuzhou University | Zhan H.,Fuzhou University
Journal of Alloys and Compounds | Year: 2017

Construction of metal oxide/sulfide and carbon-based material nanocomposites is an effective strategy to obtain high-performance electrode materials for supercapacitors. In the present work, graphene oxide nanofibers (GONFs) are selected as the support materials, and the nanocomposite of reduced graphene oxide nanofiber and cobalt sulfide (rGONF/CoS2) is synthesized via a simple and facile method. As an electrode material for pseudocapacitors, the rGONF/CoS2 nanocomposite exhibits a high specific capacitance of 635.8 F g-1 at a current density of 1 A g-1 measured in 6 M KOH electrolyte, which is much higher than that of bare cobalt sulfide. Furthermore, the rGONF/CoS2 nanocomposite has also shown excellent cycling performance with 95.4% capacitance retention over 2000 cycles. In addition, the assembled asymmetric supercapacitor (ASC) device using rGONF/CoS2 nanocomposite as cathode material and activated carbon (AC) as anode material can work at a high operating voltage of 1.65 V and show a maximum energy density of 13.8 W h kg−1 at a power density of 824.6 W kg−1. © 2017 Elsevier B.V.

Yu W.,Fuzhou University | Cheng G.,Fuzhou University
Electronics Letters | Year: 2017

A dual-parameter design of expanded proximate time-optimal controller is proposed for fast point-to-point motion in typical electromechanical servo systems with a damping element. The controller initially resorts to a saturated control signal for the fastest acceleration or braking if possible and then seamlessly gives way to a linear control strategy once the motion slows down. The damping ratio and natural frequency of the linear control law are chosen as the design parameters to allow for a better tuning of the control performance. An extended-state observer is also included for simultaneous estimation of system speed and disturbance. Experimental verification is conducted on a DC motor position servo system using a TMS320F28335 board, and the effectiveness of the proposed design is demonstrated. © The Institution of Engineering and Technology 2017.

Yu S.,Fuzhou University | Liu C.,Fuzhou University
Modern Tunnelling Technology | Year: 2017

The elastic resistance coefficient of surrounding rock is an important parameter of tunnel structure design, and is characteristically difficult and expensive in terms of in-situ testing. A method is proposed for calculating the elastic resistance coefficient based on the measured seismic wave velocity of the surrounding rock in advance geological forecasts based on the seismic reflection method. Specifically, the dynamic elastic parameters of the surrounding rock are calculated using the measured seismic wave velocity, then the static parameters of the surrounding rock are calculated based on the relationship between the dynamic and static elastic parameters of the rock mass, and the elastic resistance coefficient of the rock mass is derived. Taking the Tingzhou tunnel of the Ganlong line as an example, it is determined that the coefficients of the tunnel surrounding rock of grade III and IV are 0.54~1.19 GPa/m and 0.24~7.6 GPa/m respectively. The above calculated values are consistent with the data for elastic resistance coefficients of surrounding rock of grade III and IV specified in the "Code for Design of Railway Tunnels." © 2017, Editorial Office of "Modern Tunnelling Technology". All right reserved.

Ye J.,Fuzhou University | Wu H.,Fuzhou University
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2017

A smooth global unified controller of trajectory tracking and stabilization was proposed for nonholomomic wheeled mobile robots based on adaptive neural network control and H∞ control. Firstly, the system control inputs were expanded by transverse function method, a nonsingular full drive system which was equivalent to original system was established with decoupled input-output. Then an adaptive neural network H∞ controller was designed for the new system, such that the complex system uncertainty was compensated effectively by the adaptive neural network. Disturbances and approximation errors were attenuated with a prescribed disturbance lever by the H∞ control. Adaptability of the controller were further improved, and the control performance was optimized. The effectiveness of the algorithm were verified by simulation results. © 2017, China Mechanical Engineering Magazine Office. All right reserved.

Suen N.-T.,National Taiwan University | Hung S.-F.,National Taiwan University | Quan Q.,Fuzhou University | Zhang N.,Fuzhou University | And 2 more authors.
Chemical Society Reviews | Year: 2017

There is still an ongoing effort to search for sustainable, clean and highly efficient energy generation to satisfy the energy needs of modern society. Among various advanced technologies, electrocatalysis for the oxygen evolution reaction (OER) plays a key role and numerous new electrocatalysts have been developed to improve the efficiency of gas evolution. Along the way, enormous effort has been devoted to finding high-performance electrocatalysts, which has also stimulated the invention of new techniques to investigate the properties of materials or the fundamental mechanism of the OER. This accumulated knowledge not only establishes the foundation of the mechanism of the OER, but also points out the important criteria for a good electrocatalyst based on a variety of studies. Even though it may be difficult to include all cases, the aim of this review is to inspect the current progress and offer a comprehensive insight toward the OER. This review begins with examining the theoretical principles of electrode kinetics and some measurement criteria for achieving a fair evaluation among the catalysts. The second part of this review acquaints some materials for performing OER activity, in which the metal oxide materials build the basis of OER mechanism while non-oxide materials exhibit greatly promising performance toward overall water-splitting. Attention of this review is also paid to in situ approaches to electrocatalytic behavior during OER, and this information is crucial and can provide efficient strategies to design perfect electrocatalysts for OER. Finally, the OER mechanism from the perspective of both recent experimental and theoretical investigations is discussed, as well as probable strategies for improving OER performance with regards to future developments. © 2017 The Royal Society of Chemistry.

Wu Q.-X.,Fuzhou University | Wang W.-P.,Fuzhou University | Chen B.-C.,Fuzhou University
Gongcheng Lixue/Engineering Mechanics | Year: 2017

Natural vibration tests of single-cable-stayed beam and double-cables-stayed beam are conducted. Models of the two structures are established by the finite element method for the global dynamic analysis of cable-stayed bridges, and their accuracy is verified by the test results. According to the finite element analysis of single-cable-stayed beams to four-cables-stayed beams, the influence of the existence and number of cables on in-plane natural frequency is large, but that on out-of-plane natural frequency is small. Because cables support the beam vertically, the increase in the number of cables will lead to an increase in the in-plane natural frequency of cable-stayed beam structures. By assuming the cable's vertical support to be elastic and considering the effect of the horizontal component of cable force on the axial force of the beam, the frequency equation and mode function of in-plane natural vibration for multi-cables-stayed beams are derived. The validity and applicability of the simplified formulas are verified by finite element analyses. © 2017, Engineering Mechanics Press. All right reserved.

Li Y.,Fuzhou University | Chen Q.,Fuzhou University
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | Year: 2017

A sound event recognition method based on optimized Orthogonal Matching Pursuit (OMP) is proposed for decreasing the influence of sound event recognition on various environments. Firstly, OMP is used for sparse decomposition and reconstruction of sound signal to decrease the influence of noise and reserve the main body of sound signal, where Particle Swarm Optimization (PSO) is adopted to accelerate the best atom searching in the process of sparse decomposition. Then, an optimized composited feature of Mel-Frequency Cepstral Coefficients (MFCCs), time-frequency OMP feature, and PITCH feature is extracted from reconstructed signal. Finally, Random Forests (RF) classifier is employed to recognize 40 classes of sound events in different environments and Signal-to-Noise Rates (SNRs). The experiment result shows that the proposed method can effectively recognize sound events in various environments. © 2017, Science Press. All right reserved.

A series of polymers derived from poly(isobutylene-alt-maleic anhydride) (PIMA) with ca. 1% to >90% of the anhydride units randomly substituted with 1-pyrenylmethylimido groups (Py-PIMA) has been synthesized and characterized. The remaining anhydride units in the Py-PIMA with 10% pyrenyl substitution have been converted to N-hexyl and N-decyl imides. The photophysical properties of these polymers, as obtained from steady-state fluorescence intensities, time-correlated single photon counting experiments, and time-resolved emission spectra, have provided insights into the dependence of the polymer conformations and their labilities on the degree of pyrenyl substitution, the nature of the appended alkyl chains, temperature, and solvent properties according to the Flory interaction coefficient and Hansen solubility parameters. None of the solvent characteristics, alone, can account for all aspects of the polymer behavior. The interactions of the medium with the polymer chains and the excited singlet states of the pyrenyl units must be considered somewhat differently. The results also indicate that PIMA is a potentially very useful and versatile platform for other investigations of polymer chain and probe dynamics. © 2017 American Chemical Society.

Sun X.,Fuzhou University | Zhao J.,Fuzhou University
Silicon | Year: 2017

The reorganization of fumed silica gel formed in sulphuric acid medium after being broken has been studied using rheological measurements including thixotropy, gelling time, and gel strength determination according to the falling rod method. The original gel formed by fumed silica particles was also studied for comparison. The results showed that the segments yielded after the original gel was broken can reorganize into a new gel although its ability was weaker than that of fresh particles. The dispersed size of silica particles influenced both the formation of the original gel and the reorganization behavior. The smaller silica particles favored a prolonged gelling time but yielded a gel with relatively low strength. Comparatively, the tendency to reorganize was weaker than in the original gel formation. The standing temperature during the fresh gel formation showed less of an effect on the reorganization process. © 2017 Springer Science+Business Media Dordrecht

In this study, Al2O3-loaded expanded vermiculite (aEV/AO) with improved adsorption capacity and thermal conductivity was reported as the lauric-myristic-stearic acid eutectic mixture (LA-MA-SA) supporting matrix. The Al2O3-loaded expanded vermiculite was prepared by acid treating expanded vermiculite (aEV) followed by loading Al2O3 particles. The thermal conductivity of LA-MA-SA/aEV/AO was 0.671 W/m K, which was 156.1%, 30.8% and 37.5% higher than that of LA-MA-SA, LA-MA-SA/EV and LA-MA-SA/aEV, respectively. The latent heats of LA-MA-SA/aEV/AO were 113.7 J/g at the melting temperature of 28.6 °C and 108.5 J/g at the freezing temperature of 26.9 °C, which were also higher than those of LA-MA-SA/EV and LA-MA-SA/aEV. The results of the thermo-gravimetric analysis, thermal cycling test and Fourier transform infrared spectroscopy indicated that the LA-MA-SA/aEV/AO composite PCM was thermally stable and chemically inert. Thus, LA-MA-SA/aEV/AO is a preferential potential thermal energy material for the improving the energy efficiency in building applications due to its proper phase change temperature range, relatively high latent heat and thermal conductivity, good thermal reliability and chemical stability. © 2017 Elsevier B.V.

Wang S.,Fuzhou University | Wang S.,Nanyang Technological University | Wang H.,Nanyang Technological University
Knowledge-Based Systems | Year: 2017

Feature selection is an important research topic in machine learning and computer vision in that it can reduce the dimensionality of input data and improve the performance of learning algorithms. Low-rank approximation techniques can well exploit the low-rank property of input data, which coincides with the internal consistency of dimensionality reduction. In this paper, we propose an efficient unsupervised feature selection algorithm, which incorporates low-rank approximation as well as structure learning. First, using the self-representation of data matrix, we formalize the feature selection problem as a matrix factorization with low-rank constraints. This matrix factorization formulation also embeds structure learning regularization as well as a sparse regularized term. Second, we present an effective technique to approximate low-rank constraints and propose a convergent algorithm in a batch mode. This technique can serve as an algorithmic framework for general low-rank recovery problems as well. Finally, the proposed algorithm is validated in twelve publicly available datasets from machine learning repository. Extensive experimental results demonstrate that the proposed method is capable to achieve competitive performance compared to existing state-of-the-art feature selection methods in terms of clustering performance. © 2017 Elsevier B.V.

Observer-based two-time scale robust control is proposed for free-flying flexible-joint space manipulators with unknown payload parameters and bounded disturbances. The dynamic equations of a free-flying space manipulator with two flexible revolute joints were derived by the momentum conservation law and the Lagrange equations. A flexibility compensator was introduced to make the equivalent joint stiffness large enough, which made traditional singular perturbation approach applicable. Then, a singular perturbation model was formulated and a reduced-order controller is proposed. This controller consisted of a slow sub-controller and a fast flexible-joint sub-controller. To the slow subsystem, a sliding observer based robust slow sub-controller was proposed. By optimal linear quadratic regulator method, the fast sub-controller was designed with the estimated velocity by linear observer. This fast sub-controller could stabilize the fast subsystem around the equilibrium trajectory created by the slow subsystem under the effect of the slow control. Finally the numerical simulations were carried out, which showed that elastic joint vibrations had been stabilized effectively and good tracking performances had been achieved. Copyright © Cambridge University Press 2017

Huang Y.,University of Toledo | Huang Y.,Fuzhou University | Lapitsky Y.,University of Toledo
Journal of Colloid and Interface Science | Year: 2017

Submicron chitosan/tripolyphosphate (TPP) particles are widely investigated as nanocarriers for drugs, genes and vaccines. One of the key particle properties that requires control is their size distribution, which depends on the extent of chitosan/TPP primary nanoparticle aggregation into higher-order submicron colloids. To provide a better understanding of this higher-order aggregation process, this study analyzes the factors that control chitosan/TPP particle aggregation kinetics in the presence of free TPP (such as present during particle formation). The aggregation rates exhibit a sharp power-law decrease with the monovalent salt concentration and a power-law increase with the free TPP concentration. Moreover, the aggregation rates increase with the pH and with the chitosan degree of deacetylation (DD). These variations in aggregation rates reflect the effects of monovalent salt, TPP concentration, pH and chitosan DD on particle bridging by the surface-bound TPP. Furthermore, these aggregation rates are much faster than those predicted based on Derjaguin and Landau, Verwey and Overbeek (DLVO) interaction potentials, which might reflect nonuniformities in particle shape and charge, and/or complications caused by particle softness. Finally, implications of the above aggregation kinetics on the uniformity of chitosan/TPP micro- and nanogel size are analyzed, where we: (1) show how particle polydispersity can be diminished by lowering the chitosan DD; and (2) explain the opposing results on how chitosan/TPP particle polydispersity is affected by monovalent salt. © 2016 Elsevier Inc.

Li M.,Fuzhou University | Chen Q.,Fuzhou University | Zhan H.,Fuzhou University
Journal of Alloys and Compounds | Year: 2017

In this work, N-doped carbon nanotubes (NCNTS) have been easily unzipped using a chemical oxidation method to obtain porous and multi-defective partially unzipped N-doped carbon nanotubes (PU-NCNTs), which are promising as negative electrode materials for supercapacitors and are also suitable substrate materials for the efficient loading of ultrathin manganese dioxide (MnO2) nanosheets. Herein, the PU-NCNT/MnO2 composite was synthesized through a simple microwave irradiation method. Moreover, we have fabricated an asymmetric supercapacitor (ASC) using PU-NCNT/MnO2 composite as cathode, PU-NCNTs as anode and neutral aqueous Na2SO4 as electrolyte. Because of the synergistic effects of the PU-NCNTs electrode and the high capacitance as well as good rate performance of PU-NCNT/MnO2 composite, the asymmetric cell exhibited good electrochemical performance. The optimized ASC can be worked stably in the voltage window of 0–1.8 V and exhibited a maximum energy density of 14.76 Wh kg−1 at the current density of 1 A g−1. Additionally, the PU-NCNT/MnO2//PU-NCNT ASC exhibited long cycling stability with 80.5% specific capacitance retained after 1000 cycles at a current density of 1 A g−1. These encouraging results show that PU-NCNT/MnO2 could be promising materials for commercial use of supercapacitors. © 2017

Wang X.,Shanxi Normal University | Yan R.,Fuzhou University | Li J.,University of Technology, Sydney | Song J.,Monash University | Song J.,CAS Tianjin Institute of Industrial Biotechnology
Molecular BioSystems | Year: 2016

Protein S-sulfenylation (SOH) is a type of post-translational modification through the oxidation of cysteine thiols to sulfenic acids. It acts as a redox switch to modulate versatile cellular processes and plays important roles in signal transduction, protein folding and enzymatic catalysis. Reversible SOH is also a key component for maintaining redox homeostasis and has been implicated in a variety of human diseases, such as cancer, diabetes, and atherosclerosis, due to redox imbalance. Despite its significance, the in situ trapping of the entire 'sulfenome' remains a major challenge. Yang et al. have recently experimentally identified about 1000 SOH sites, providing an enriched benchmark SOH dataset. In this work, we developed a new ensemble learning tool SOHPRED for identifying protein SOH sites based on the compositions of enriched amino acids and the physicochemical properties of residues surrounding SOH sites. SOHPRED was built based on four complementary predictors, i.e. a naive Bayesian predictor, a random forest predictor and two support vector machine predictors, whose training features are, respectively, amino acid occurrences, physicochemical properties, frequencies of k-spaced amino acid pairs and sequence profiles. Benchmarking experiments on the 5-fold cross validation and independent tests show that SOHPRED achieved AUC values of 0.784 and 0.799, respectively, which outperforms several previously developed tools. As a real application of SOHPRED, we predicted potential SOH sites for 193 S-sulfenylated substrates, which had been experimentally detected through a global sulfenome profiling in living cells, though the actual SOH sites were not determined. The web server of SOHPRED has been made publicly available at http://genomics.fzu.edu.cn/SOHPRED for the wider research community. The source codes and the benchmark datasets can be downloaded from the website. © 2016 Published by Elsevier B.V.

Zeng Q.-L.,Fuzhou University | Sun Q.-B.,Fuzhou University
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2017

Using the spatial Durbin model, we examine the relationship between the level of information development and the total productivity of China's logistics industry based on the panel data of 30 provinces, municipalities, and autonomous regions of China from 2004 to 2014. The results show that there is significant spatial correlation between them, and informatization positively affects the local logistics industry productivity and has significant spillover effects on neighboring provinces. Copyright © 2017 by Science Press.

Xin Q.,Fuzhou University | Zhou X.,Fuzhou University
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2017

A cooperative evolution model of growing network based on dynamic payoff matrices was built. The model involved network structure evolution caused by the increasing number of individuals and the links between them, and individual strategy evolution according to the changing payoff matrices. In this model, feedback mechanism was used to make payoff matrices vary with the network environment. And considering some parameters such as feedback intensity, the initial value of the temptation for defecting, average node degree, the effect of feedback mechanism on cooperative evolution of growing network was analyzed. Numerical simulation results show that the network grown up according to the model has the characteristic of power-law distribution; Feedback mechanism can effectively raise the rate of cooperation on network; and the lager the feedback intensity, the initial value of the temptation of defect and the average node degree is, the more effective feedback mechanism is. © 2017, The Editorial Board of Journal of System Simulation. All right reserved.

Qin T.,Fuzhou University | He J.,Fuzhou University
Applied System Innovation - Proceedings of the International Conference on Applied System Innovation, ICASI 2015 | Year: 2016

The directional movement of users’ fingers has become one of the most interesting topics for human-computer interaction. Since a large proportion of people are right-handed, most application software for touch screen devices are designed based on the habit of right-handed users. However, this kind of design may cause inconveniences for the left-handed users when they slide over the screen, and it might lead to operational mistakes. In this study, a tunnel sliding experiment is designed to investigate the finger behavior attributes of the left-handed population. According to the experimental results, the finger behavioral differences between the left- and right-handed people are figured out, which contributes to the design of the user friendly software of touch screen devices for both the left- and right-handed users. This study is the basic research of touch devices interaction design and has a guiding value for the user interface design of mobile the touch devices. © 2016 Taylor & Francis Group, London.

Chen J.,Fuzhou University | Shao Y.,Fuzhou University | Li D.,Fuzhou University
Journal of Materials Chemistry A | Year: 2017

The sample H1.23Sr0.45SbO3.48 crystallized in a pyrochlore structure is applied to photocatalytic oxidation of benzene in the gaseous phase. The pyrochlore structure is considered as the key factor for the effective oxygen adsorption, which makes the sample exhibit excellent photocatalytic activity. © The Royal Society of Chemistry.

Li Z.,Fuzhou University | Li X.-X.,Fuzhou University | Yang T.,Fuzhou University | Cai Z.-W.,Fuzhou University | Zheng S.-T.,Fuzhou University
Angewandte Chemie - International Edition | Year: 2017

A series of polyoxometalates (POMs) that incorporate the highest-nuclearity Ln clusters that have been observed in such structures to date (Ln26, Ln=La and Ce) are described, which exhibit giant multishell configurations (Ln⊂W6⊂Ln26⊂W100). Their structures are remarkably different from known giant POMs that feature multiple Ln ions. In particular, the incorporated Ln-O clusters with a nuclearity of 26 are significantly larger than known high-nuclearity (≤10) Ln-O clusters in POM chemistry. Furthermore, they also contain the largest number of La and Ce centers for any POM reported to date and represent a new kind of rare giant POMs with more than 100 Watoms. Interestingly, the La26-containing POM can undergo a single-crystal to single-crystal structural transformation in the presence of various transition-metal ions, such as Cu2+, Co2+, and Ni2+, from an inorganic molecular nanocluster into an inorganic-organic hybrid extended framework that is built from POM building blocks with even higher-nuclearity La28 clusters bridged by transition-metal complexes. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xiang X.,Fujian Agriculture and forestry University | Zi-Hang D.,Fuzhou University
Journal of Modern Transportation | Year: 2017

The hyperbolic function proposed by Abbo–Sloan was employed not only to approach the Mohr–Coulomb criterion but also to express the plastic potential function. A better approximation to the Mohr–Coulomb yield and potential surfaces was achieved by increasing the transition angle and proven to be highly efficient in numerical convergence. When a Gaussian integral point goes into plastic state, two cases on yield stress adjustments were introduced. They may avoid solving the second derivative of the plastic potential function and the inverse matrix compared with the existing subroutine. Based on the above approaches, a fully implicit backward Euler integral regression algorithm was adopted. The two- and three-dimensional user subroutines which can consider the associated or non-associated flow rule were developed on the platform of the finite element program—ABAQUS. To verify the reliability of these two subroutines, firstly, the numerical simulations of the indoor conventional triaxial compression and uniaxial tensile tests were performed, and their results were compared with those of the embedded Mohr–Coulomb model and the analytical approach. Then the main influential factors including the associated or non-associated flow rule, the judgment criteria of slope failure, and the tensile strength of soil were analyzed, and the application of the two-dimensional subroutine in the stability analysis of a typical soil slope was discussed in detail through comparisons with the embedded model and the limit analysis method, which shows that this subroutine is more applicable and reliable than the latter two. © 2017, The Author(s).

Chen D.,Fuzhou University | Qiu Y.,Fuzhou University | Chen Y.,Fuzhou University | He Y.,Fuzhou University
IEEE Transactions on Power Electronics | Year: 2017

A nonlinear pulse width modulation-controlled single-phase boost mode photovoltaic grid-connected inverter with limited storage inductance current is proposed in this paper. The circuit topology, control strategy, steady-state principle characteristic, and design criterion for the key circuit parameters of this kind of inverter are investigated in depth, and important conclusions are obtained. The inverter's regenerating energy duty ratio 1-D which decreases with the decline of the grid-connected voltage is real time adapted by sampling and feeding back the inverting bridge modulation current, and the average value of the modulation current in each switching cycle tracks the reference sinusoidal signal to get high-quality grid-connected current. The active control of the energy storage inductance current and the balance of the voltage step-up ratio are realized by adding a bypass switch connected in parallel with the energy storage inductance and using two kinds of switching pattern namely boost pattern and freewheeling pattern. The theoretical analysis and experimental results of the 1 kVA 110 VDC/220 V50 Hz photovoltaic grid-connected inverter prototype show that it has the advantages such as single-stage boost conversion, high conversion efficiency, high quality of grid-connected current waveform, low value of energy storage inductance, simple control, etc. © 1986-2012 IEEE.

Chuang L.-W.,Fuzhou University | Chiu S.-P.,Fuzhou University
Applied System Innovation - Proceedings of the International Conference on Applied System Innovation, ICASI 2015 | Year: 2016

Given the rapid growth in the communication landscape for users brought about by participative Internet use, online games, and social media, it is important to explore a better understanding of these online technologies and their impact on the users’ willingness to help a member. This study integrates perceived value, social capital, and cognitive absorption as the antecedents of the users’ willingness to help individual members; furthermore affecting the Social Media Communities (SMCs) continuance. The results display the concernment of perceived value, social capital, and cognitive absorption, which plays a decisive role and produces direct effects in predicting the willingness to help online members in this model. Depending on our findings, practical implications for SMCs marketing strategies and theoretical implications will be predicted. © 2016 Taylor & Francis Group, London.

Cheng J.,Fuzhou University | Chen L.,Fuzhou University
Proceedings of the International Astronautical Congress, IAC | Year: 2016

Free-floating space manipulator is an important on space equipment in the outer space, and be installed on the satellite carrier or other floating base, which help the astronauts completed many space missions, such as space equipment maintaining, removing debris of orbital and filling control liquid for spacecraft. When space manipulator system to perform these space tasks, it is need for rendezvous and docking. In the pre-impact process, the space manipulator will collide with the captured target. Especially the target is spin non-cooperative satellite-has certain rotation velocity, collision will lead to the combined system with large angle rotation which is dangerous for space equipment. Space manipulator system is often with long arms and big load, in order to reduce the quality of the system the lightweight flexible are used at the same time. It will produce the flexible vibration in the process of movement, which make the system dynamics equation nonlinear. In order to ensure the control accuracy, flexible vibration should not be neglected, and need to design effective control scheme to suppress the structural vibration. The space manipulator with two flexible arms is the research object in this paper. With the assume modes method, the dynamic equations of space robot and target are derived by Lagrangian approach and Newton Euler method. The impact of the collision effect were evaluated is obtained by using the impulse law, the combined system is obtained by the collision theory in post-impact process. The calm motion control of joints and attitude angles is designed by use adaptive neural network algorithm. Based on the above control algorithm, using the linear quadratic optimal control theory, flexible vibration suppression control algorithm is designed, and a composite control algorithm calm motion control scheme of the combined system is formed. At last, numerical examples simulate the process of collision and the efficiency of the control scheme is verified by the simulation results. Copyright © 2016 by the International Astronautical Federation. All rights reserved.

Yu X.,Fuzhou University | Li C.,Fuzhou University
Proceedings of the International Astronautical Congress, IAC | Year: 2016

A robust motion control and vibration optimal control is addressed for a free-flying two-flexible-link space manipulator with elastic base. In this system there are unknown but bounded external disturbances and parameters. Firstly the dynamic model of a free-flying space manipulator with two flexible links and elastic base is established by the momentum conservation and the Lagrange equations. Secondly based on singular perturbation approach and choosing appropriate local coordinate frame, the interactions of rigid and flexible motion and the interactions of flexible motions are decoupled, and a slow subsystem and a flexible fast subsystem are obtained. Then the corresponding controllers are proposed for the two subsystems, which are the robust slow subsystem controller and the flexible fast subsystem optimal controller. And a composite controller is combined with the two subsystem controllers to control the motion, the flexible link and base vibrations simultaneously. Finally Numerical simulation demonstrates the proposed control algorithm's efficiency. The virtue of this control scheme is that the linear position, linear velocity, linear acceleration of the base needn't be measured directly. Copyright © 2016 by the International Astronautical Federation. All rights reserved.

Cheng J.,Fuzhou University | Chen L.,Fuzhou University
Proceedings of the International Astronautical Congress, IAC | Year: 2016

With the increase of human activities in space, the space robot has played a more and more important role. The development of Space technology put forward higher requirements on the performance of the space robot, the dual-arm space robot has movement stability and load ability, will become an important tool in the future space missions. Space station remote manipulator system and its end effector-SPDM put into use, which means that dual arm space robot has been used in the space. Dual-arm system is similar to the upper limbs of primate, which is more advantageous to carry objects, ensure the control accuracy. In the process of space robot to complete various missions, actuators is inevitably impacted by target. Space robot itself is in a state of weightlessness in space, which may lead to large angle rotation is dangerous for the space facilities. For space robot arms grab task, coupling motion relations are between arms and base, make its control design scheme is become more difficult than ground robot. In addition, the existences of dual-arm space robot with closed chain constraint and controller redundancy add the difficulty of control design. In this paper, the impact effect analysis for a dual-arm space robot capturing a satellite and the coordinated stabilization control problem for closed chain system are discussed. At first, the dynamic equations of dual-arm space robot and satellite are obtained by multi-body theory. The response of the dual-arm space robot impacted by the target is analyzed by momentum conservation law; the dynamic evolution process is derived at the same time. Secondly, the recurrent fuzzy neural network control scheme is designed for unstable closed chain system with uncertain system parameter. In order to overcome the effects caused by system parameter perturbation and external disturbance, the recurrent fuzzy neural network is used to approximate the unknown part with H∞ tracking characteristic. Meanwhile, the weighted minimum-norm theory is introduced to distribute torques guarantee that cooperative operation between manipulators. At last, numerical examples simulate the process of collision and the efficiency of the control scheme is verified by the simulation results. Copyright © 2016 by the International Astronautical Federation. All rights reserved.

Yu Y.-L.,Fuzhou University
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2016

Er3+/Ni2+ co-doped dual-phase glass ceramics containing both hexagonal GdF3 and cubic Ga2O3 nano-crystals were successfully prepared by a melt quenching method. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate the homogenous precipitation of GdF3 sized about 34 nm and Ga2O3 sized about 9 nm in glass matrix. The incorporation of Er3+ into GdF3 and the selective partitioning of Ni2+ ions in Ga2O3 nano-crystals were demonstrated by the absorption and emission spectra. Impressively, an integrated broad near infrared emission band in the wavelength region of 1050-1600 nm, consisting of Ni2+:3T2(F)→3A2(F) emission around 1210 nm and Er3+:4I13/2→4I15/2 emission peak at 1530 nm, was obtained under 976 nm excitation. © 2016, Chinese Ceramic Society. All right reserved.

Jiang F.,Fuzhou University | Jiang S.,CAS Beijing Institute of Applied Physics And Computational Mathematics | Wu G.,Huaqiao University
Journal of Functional Analysis | Year: 2017

We investigate the stabilizing effect of elasticity in the Rayleigh-Taylor (RT) problem of stratified immiscible viscoelastic fluids, separated by a free interface and in the presence of a uniform gravitational field, in a horizontally periodic domain where the velocities of the fluids are non-slip on both upper and lower fixed flat boundaries, while the internal surface tension is omitted. We establish a discriminant Cr for the stability of the stratified viscoelastic RT problem. More precisely, if Cr<1, then the stratified viscoelastic RT equilibrium state is exponentially stable. This means that a sufficiently large elasticity coefficient has stabilizing effect so that it can inhibit viscoelastic RT instability. On the other hand, if Cr>1, then we show that the RT equilibrium state is linearly unstable in the Hadamard sense. Moreover, for the case of a nonhomogeneous incompressible viscoelastic fluid, the condition Cr>1 will lead to the nonlinear instability of the RT equilibrium state; and this shows that the RT instability still occurs in viscoelastic fluids when the elasticity coefficient is small. © 2017 Elsevier Inc.

Xia Y.,Fuzhou University
Proceedings - 2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2016 | Year: 2016

This paper proposes a new neural fusion algorithm for fast robust image restoration without requiring the optimal regularization parameter. The new neural fusion algorithm is based on a new reduced dimension neural network (RDNN). The RDNN is guaranteed to obtain an optimal fusion weight. The proposed RDNN-based neural fusion algorithm uses only a very small solution space to compute the optimal fusion weight, unlike existing neural fusion algorithms with solution space dimension being grater than image size. Unlike current image restoration algorithms, the proposed neural fusion algorithm has a low-dimensional solution space Computed results show that the proposed new algorithm has a robust performance against non-Gaussian noise and can obtain a good image estimate at a fast speed by using the non-optimal regularization parameter. © 2016 IEEE.

Wei Q.,Fuzhou University | Guo M.,Fuzhou University
IEEE Region 10 Annual International Conference, Proceedings/TENCON | Year: 2017

This paper shows that after integrating with virtual synchronous generator technology and removing integral path from controller, rotor angle control (RAC) changes to virtual rotor angle droop control, which can be used in stand alone microgrid. The new control strategy has something in common with RAC. First, the control parameters remain unchanged in all controllers. Second, power balance and system frequency can be restored automatically and autonomously (no communication or dispatching center order is needed during this process). Aside from these, the new control strategy has other merits. The load change can be shared nearly in proportion to voltage source inverter (VSI) rated capacity under the new mode. The sharing ratio is acceptable when complex topology and highly resistive lines are used in microgrid. This paper shows how the effect is achieved and gives corresponding simulation results. © 2016 IEEE.

Liang N.,Fuzhou University
Proceedings of the IEEE International Conference on Advanced Materials for Science and Engineering: Innovation, Science and Engineering, IEEE-ICAMSE 2016 | Year: 2016

As a new VR technic, 3d holographic laser projection can be used in commercial performance, gala evening and other activities with exquisite virtual visual effects. The dissertation illustrated the concept and features of holographic laser projection, emphasizing on the application of the holographic laser projection in the entertaining performance given by a typical example of 'Blue Fantasy'. Furthermore, the assignment explained and analyzed the technology structure, implementation method, visual effect and value embodiment of the holographic laser projection, hoping to provide further guidance and reference for the combination of holographic laser projection and entertaining activities. © 2016 IEEE.

Lan T.,Fuzhou University | Zhang W.,Fuzhou University | Wu N.-L.,National Taiwan University | Wei M.,Fuzhou University
Chemistry - A European Journal | Year: 2017

A homogeneous Nb-doped rutile TiO2 mesocrystal material was synthesized successfully through a facile hydrothermal route. The incorporation of Nb5+ not only promotes the crystallization of the building subunits of the rutile TiO2 mesocrystal, but also improves the electrochemical performance at higher current rates. A capacity of 96.3mAhg-1 at a current density as high as 40C and an excellent long-term cycling stability with a capacity loss of approximately 0.006% per cycle at 5C could be achieved when an appropriate amount of Nb5+ was doped into rutile TiO2 mesocrystal. The reasons for the improvement of rate capability may be attributed to the enhancement of electronic conductivity, Li-ion diffusion kinetics, and the surface storage property for the Nb-doped rutile TiO2 mesocrystal. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

News Article | April 17, 2017
Site: co.newswire.com

​Jane Lee, President of the Jane Lee Team at RE/MAX Top Performers, has joined The Expert Network©, an invitation-only service for distinguished professionals. Ms. Lee has been chosen as a Distinguished Real Estate Professional™ based on peer reviews and ratings, dozens of recognitions, and accomplishments achieved throughout her career. Ms. Lee outshines others in her field due to her numerous awards and recognitions, outstanding customer service, and career longevity. She graduated from Fuzhou University in China with a bachelor’s degree in chemical engineering before earning her master's degree in computer science from Loyola University in Chicago. After graduating, she spent the first ten years of her career with RE/MAX working as a buyer’s agent, developing a thorough understanding of the buyer's side of the deal. Today, Jane is known as a powerful listing agent, leading a team of eighteen highly productive sales agents and industry experts along with several licensed office staff and other support personnel. Through her hard work and dedication to her clients, Ms. Lee has emerged as one of the most successful real estate professionals in the United States and around the world, ranking among the top 3% in her field. With over 25 years dedicated to real estate, Ms. Lee brings a wealth of knowledge to her industry, and, in particular, to her area of expertise, residential properties in the Lake County and Northern Illinois areas. When asked why she decided to pursue a career in real estate, Ms. Lee said: "I decided after graduating that I didn't want to work for anyone else. I thought real estate would be a great way for me to empower myself and create my own business." Ms. Lee award winning team of agents averages a sales volume between $100-$174 million per year. Jane is currently ranked number one in both Northern Illinois and the Lake County area, number three in Chicagoland, number twelve nationwide, and number twenty-four worldwide for sales. She is also the recipient of numerous other accolades: she has been inducted into the RE/MAX Diamond Club, has been named among the 100 Most Influential Real Estate Agents by Real Estate Executive Magazine, has received the Luminary of Distinction Award, and has also been named “Best in Business in the Real Estate Category” by the Small Business Commerce Association since 2009. As a thought-leader in her field, Ms. Lee keeps a close eye on prevailing trends in the Northern Illinois real estate market. In particular, she noted that not all housing markets have had the same recovery experience since the Great Recession: "We've noticed in our local market that home prices have stagnated somewhat. They've inched up slightly, and homes are still selling, but we're not quite seeing the bounce-back that some other major markets have seen after the recession." The Expert Network© has written this news release with approval and/or contributions from Jane Lee. The Expert Network© is an invitation-only reputation management service that is dedicated to helping professionals stand out, network, and gain a competitive edge. The Expert Network selects a limited number of professionals based on their individual recognitions and history of personal excellence.

Yang H.-X.,Fuzhou University | Rong Z.,University of Electronic Science and Technology of China | Wang W.-X.,Beijing Normal University
New Journal of Physics | Year: 2014

The paradox of cooperation among selfish individuals still puzzles scientific communities. Although a large amount of evidence has demonstrated that the cooperator clusters in spatial games are effective in protecting the cooperators against the invasion of defectors, we continue to lack the condition for the formation of a giant cooperator cluster that ensures the prevalence of cooperation in a system. Here, we study the dynamical organization of the cooperator clusters in spatial prisoner's dilemma game to offer the condition for the dominance of cooperation, finding that a phase transition characterized by the emergence of a large spanning cooperator cluster occurs when the initial fraction of the cooperators exceeds a certain threshold. Interestingly, the phase transition belongs to different universality classes of percolation determined by the temptation to defect b. Specifically, on square lattices, 1 < b < 4/3 leads to a phase transition pertaining to the class of regular site percolation, whereas 3/2 < b < 2 gives rise to a phase transition subject to invasion percolation with trapping. Our findings offer a deeper understanding of cooperative behavior in nature and society. © 2014 IOP Publishing and Deutsche Physikalische Gesellschaft.

Wang C.M.,National University of Singapore | Zhang Y.Y.,Fuzhou University | Zhang Y.Y.,University of Western Sydney | Xiang Y.,University of Western Sydney | Reddy J.N.,Texas A&M University
Applied Mechanics Reviews | Year: 2010

This paper reviews recent research studies on the buckling of carbon nanotubes. The structure and properties of carbon nanotubes are introduced to the readers. The various buckling behaviors exhibited by carbon nanotubes are also presented herein. The main factors, such as dimensions, boundary conditions, temperature, strain rate, and chirality, influencing the buckling behaviors are also discussed, as well as a brief introduction of the two most used methods for analyzing carbon nanotubes, i.e., continuum models and atomistic simulations. Summary and recommendations for future research are also given. Finally, a large body of papers is given in the reference section. It is hoped that this paper provides current knowledge on the buckling of carbon nanotubes, reviews the computational methods for determining the buckling loads, and inspires researchers to further investigate the buckling properties of carbon nanotubes for practical applications. © 2010 by ASME.

Yang S.,Rice University | Gong Y.,Rice University | Zhang J.,Fuzhou University | Zhan L.,Rice University | And 5 more authors.
Advanced Materials | Year: 2013

Graphitic carbon nitride nanosheets are extracted, produced via simple liquid-phase exfoliation of a layered bulk material, g-C3N 4. The resulting nanosheets, having ≈2 nm thickness and N/C atomic ratio of 1.31, show an optical bandgap of 2.65 eV. The carbon nitride nanosheets are demonstrated to exhibit excellent photocatalytic activity for hydrogen evolution under visible light. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chen J.,Fuzhou University | Cai Y.,Fuzhou University | Clark M.,Southern Cross University of Australia | Yu Y.,Fuzhou University
PLoS ONE | Year: 2013

Phosphate removal to a hydrothermally modified fumed silica and pulverized oyster shell material for use in wastewater treatments were made. Sorption data modeling (pH's 3-11, P concentrations of 3, 5, 10, 15, 20, & 25 mg/L, and at an ambient temperature of 23°C) indicate that an optimal removal of P occurs at pH 11. Three kinetic models were also applied (a pseudo-first-order Lagergren kinetic model, a pseudo-second-order (PSO) kinetic and Elovich) and indicate that a PSO model best describes P-removal. In addition, an application of the Weber and Morris intra-particle diffusion model indicates that external mass transfer and intra-particle diffusion were both involved in the rate-determining step. Langmuir, Freundlich modeling of the sorption data also indicate that the heterogeneous Freundlich sorption site model best describes the data although Langmuir data also fit with data tailing suggesting data are not linear. The data collected indicates that the hydrothermally modified fumed silica and pulverized oyster shell material is suitable for use in wastewater treatment, with P-removal to the solids being preferential and spontaneous. © 2013 Chen et al.

Wang Q.,Fujian Normal University | Zheng H.,Fuzhou University | Gao X.,Fuzhou University | Lin Z.,Fuzhou University | Chen G.,Fuzhou University
Chemical Communications | Year: 2013

A label-free ultrasensitive electrochemical aptameric sensor which combined the advantages of an aptamer and hyperbranched rolling circle amplification (HRCA) has been developed for specific recognition of a platelet-derived growth factor B-chain (PDGF-BB). © 2013 The Royal Society of Chemistry.

Kim T.W.,Hanyang University | Yang Y.,University of California at Los Angeles | Li F.,Fuzhou University
NPG Asia Materials | Year: 2012

Nonvolatile memory devices based on hybrid inorganic/organic nanocomposites have emerged as excellent candidates for promising applications in next-generation electronic and optoelectronic devices. Among the various types of nonvolatile memory devices, organic bistable devices fabricated utilizing hybrid organic/inorganic nanocomposites have currently been receiving broad attention because of their excellent performance with high-mechanical flexibility, simple fabrication and low cost. The prospect of potential applications of nonvolatile memory devices fabricated utilizing hybrid nanocomposites has led to substantial research and development efforts to form various kinds of nanocomposites by using various methods. Generally, hybrid inorganic/organic nanocomposites are composed of organic layers containing metal nanoparticles, semiconductor quantum dots (QDs), core-shell semiconductor QDs, fullerenes, carbon nanotubes, graphene molecules or graphene oxides (GOs). This review article describes investigations of and developments in nonvolatile memory devices based on hybrid inorganic/organic nanocomposites over the past 5 years. The device structure, fabrication and electrical characteristics of nonvolatile memory devices are discussed, and the switching and carrier transport mechanisms in the hybrid nonvolatile memory devices are reviewed. Furthermore, various flexible memory devices fabricated utilizing hybrid nanocomposites are described and their future prospects are discussed. © 2012 Nature Japan K.K. All rights reserved.

Qiu L.,Fuzhou University | Liu W.,Fuzhou University | Huang M.,China Institute of Technology | Zhang L.,Fuzhou University
Journal of Chromatography A | Year: 2010

A relatively selective, chemically and physically robust SPME fiber was developed in a simple way with testosterone-imprinted polymer, and then directly coupled with gas chromatography-mass spectrometry (GC-MS) for selective extraction and analysis of anabolic steroids. The factors influencing polymerization (i.e., cross-linker, polymerization solvent, polymerization time) were optimized in detail and the polymer was characterized by scanning electron microscope, infrared spectrometer and thermogravimetric analyzer. Furthermore, the extraction performance of the MIP-coated SPME fibers such as extraction ability and selectivity was evaluated. Moreover, the interaction mode between target analytes and fiber coating was deducted. Finally, the method for extraction and determination of androsterone, stanolone, androstenedione and methyltestosterone by the homemade MIP-coated SPME fibers with GC-MS was obtained. It was applied to the simultaneous analysis of four anabolic steroids in the spiked human urine with the satisfactory recoveries. © 2010 Elsevier B.V.

Yu Y.,Fuzhou University | Wang J.,Fuzhou University | Parr J.F.,Southern Cross University of Australia
Procedia Engineering | Year: 2012

The fumed silica used to produce the photocatalytic materials. TiO 2 gel was obtained using tetrabutyl titanate as a precursor via an acid catalyzed sol-gel process. A novel TiO2/fumed silica porous ceramic material was produced using a 4% phosphoric acid binder. The influence of heating temperature on the crystalline phases of TiO2, and the properties and photocatalytic activity of TiO2 was investigated. The experimental results showed that the transformation of TiO2 from anatase to rutile began at 725 °C. The photocatalytic porous ceramic materials which were heated at 700-800 °C exhibited high tensile strength (7.67-8.18 MPa), high specific surface areas (25.01-25.07 m2 g-1), high anatase content (>90%) and good photocatalytic activity, as confirmed by the complete degradation of a 10 mg L-1 methyl orange solution using 15W.m-2 with ultraviolet light irradiation over 24 h. This technique successfully overcomes the difficulties in separation and recovery commonly associated with most commercial TiO2 in a superfine powder state. © 2011 Published by Elsevier Ltd.

Zhang Y.Y.,Fuzhou University | Wang C.M.,National University of Singapore | Challamel N.,INSA Rennes
Journal of Engineering Mechanics | Year: 2010

The hybrid nonlocal Euler-Bernoulli beam model is applied for the bending, buckling, and vibration analyzes of micro/nanobeams. In the hybrid nonlocal model, the strain energy functional combines the local and nonlocal curvatures so as to ensure the presence of small length-scale parameters in the deflection expressions. Unlike Eringen's nonlocal beam model that has only one small length-scale parameter, the hybrid nonlocal model has two independent small length-scale parameters, thereby allowing for a more flexible and accurate modeling of micro/nanobeamlike structures. The equations of motion of the hybrid nonlocal beam and the boundary conditions are derived using the principle of virtual work. These beam equations are solved analytically for the bending, buckling, and vibration responses. It will be shown herein that the hybrid nonlocal beam theory could overcome the paradoxes produced by Eringen's nonlocal beam theory such as vanishing of the small length-scale effect in the deflection expression or the surprisingly stiffening effect against deflection for some classes of beam bending problems. © 2010 ASCE.

Yu Y.,Fuzhou University | Wu R.,Fuzhou University | Clark M.,Southern Cross University of Australia
Journal of Colloid and Interface Science | Year: 2010

A calcined and hydrothermally annealed material for phosphate removal was prepared in a hollow cylindrical shape from fumed silica generated by a ferroalloy factory, and pulverized oyster shell. Phosphorus removal from wastewater by this material calcined at a range of temperatures (700-900°C) and hydrothermally annealed at temperatures from 130 to 180°C, for 8-16h, was investigated and the most suitable physicochemical conditions were determined. XRD, SEM, EDS, and XRF techniques were used to characterize the microstructures and compositions of the materials produced, and UV-Vis spectrophotometry using the ammonium phosphomolybdate blue method was used to determine the phosphate concentration in the wastewater. The results indicate that calcium carbonate in oyster shell reacted with SiO2 in fumed silica and formed hydrated calcium silicate after hydrothermal treatment, and the hydrated calcium silicate reacted with phosphate ions in wastewaters to form hydroxyapatite precipitate. The optimal conditions for material production were calcination at 800°C, and hydrothermal annealing at 150°C for 12h. Materials made under these conditions showed 74% or 92% phosphate removal after 2 or 4h, respectively. © 2010 Elsevier Inc.

Liang S.,Fuzhou University | Wen L.,Fuzhou University | Lin S.,Fuzhou University | Bi J.,Fuzhou University | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2014

Monolayer HNb3O8 2D nanosheets have been used as highly chemoselective and active photocatalysts for the selective oxidation of alcohols. The nanosheets exhibit improved photocatalytic activity over their layered counterparts. Results of in situ FTIR, DRS, ESR, and DFT calculations show the formation of surface complexes between the Lewis acid sites on HNb 3O8 2D nanosheets and alcohols. These complexes play a key role in the photocatalytic activity of the material. Furthermore, the unique structural features of the nanosheets contributed to their high photocatalytic activity. An electron transition from the coordinated alcohol species to surface Nb atoms takes place and initiates the aerobic oxidation of alcohols with high product selectivity under visible light irradiation. This reaction process is distinct from that of classic semiconductor photocatalysis. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Wu C.,Fuzhou University | Li F.,Fuzhou University | Zhang Y.,Fuzhou University | Guo T.,Fuzhou University | Chen T.,National University of Singapore
Applied Physics Letters | Year: 2011

The functionalization of graphene oxide (GO) sheets with polyimide (PI) enables the layer-by-layer fabrication of a GO-PI hybrid resistive-switch device and leads to high reproducibility of the memory effect. The current-voltage curves for the as-fabricated device exhibit multilevel resistive-switch properties under various reset voltages. The capacitance-voltage characteristics for a capacitor based on GO-PI nanocomposite indicate that the electrical switching may originate from the charge trapping in GO sheets. The high device-to-device uniformity and unique memory properties of the device make it an attractive candidate for applications in next-generation high-density nonvolatile flash memories. © 2011 American Institute of Physics.

Ouyang H.,Fuzhou University | Gao Y.,Fuzhou University | Gao Y.,Fujian Normal University | Yuan Y.,Fuzhou University
Tetrahedron Letters | Year: 2013

The first rhodamine-based optical-electrochemical multichannel chemosensor for Fe3+ (1) has been designed and synthesized. The probe 1 displayed an extreme selectivity for Fe3+ over a range of other metal ions, including Cr3+, through UV/vis absorption, fluorescence emission and electrochemical measurements. © 2013 Elsevier Ltd. All rights reserved.

Su W.,Fuzhou University | Fang X.,Beijing Normal University | Miller J.K.,Nova Southeastern University | Wang Y.,Beijing Normal University
Cyberpsychology, Behavior, and Social Networking | Year: 2011

Internet addiction among college students has become a serious problem in China. This pilot study involved the development of an online expert system named Healthy Online Self-helping Center (HOSC) as an intervention tool to help those who wish to reduce online usage. The study also explored the effectiveness of HOSC for college students' Internet addiction behavior. Participants (N=65) were recruited from a university in Beijing, and were randomly assigned to one of four conditions: using HOSC within a laboratory environment, using HOSC within a natural environment, using a noninteractive program, and a control group. All the participants were asked to answer questionnaires at the baseline and at the 1-month follow-up. The questionnaires included the participants' online hours per week, the legitimate ratio of Internet usage, online satisfaction, and the Young's Diagnostic Questionnaire. The results revealed that HOSC under both natural and laboratory environments could effectively reduce the participants' online hours per week as well as their Young's Diagnostic Questionnaire score, and improve online satisfaction at a 1-month follow-up. Participants using a noninteractive program also had similar results. The article concludes with a discussion of the limitations of the study, as well as the implications of the findings and future research directions. © Copyright 2011, Mary Ann Liebert, Inc.

Hong Y.,Fuzhou University | Kang L.,Shanghai University
Theoretical Computer Science | Year: 2012

A graph G is called an interval graph if there exists a set of intervals corresponding to the vertex set of G and two vertices are adjacent to each other if and only if the two corresponding intervals are intersecting with each other. In this paper, we apply the reliability-based backup 2-center modal proposed by Wang, Wu and Chao, in which each server may fail with a given probability, to interval graphs and present an O(n) time algorithm. © 2012 Elsevier B.V. All rights reserved.

Lin X.,Fuzhou University | Lin X.,Fujian Normal University
Chinese Physics Letters | Year: 2010

We propose a scheme for generating a χ-type four-atom entangled state in cavity QED. In the present scheme, the atoms interact simultaneously with a highly detuned cavity mode with the assistance of a strong classical field. The scheme is insensitive to the cavity decay and the thermal field, which is of importance from the experimental point of view. © 2010 Chinese Physical Society and IOP Publishing Ltd.

Yang H.,Fuzhou University | Wang W.,Beijing Normal University | Lai Y.,Arizona State University
Chaos | Year: 2012

Recent studies have suggested the necessity to incorporate traffic dynamics into the process of epidemic spreading on complex networks, as the former provides support for the latter in many real-world situations. While there are results on the asymptotic scope of the spreading dynamics, the issue of how fast an epidemic outbreak can occur remains outstanding. We observe numerically that the density of the infected nodes exhibits an exponential increase with time initially, rendering definable a characteristic time for the outbreak. We then derive a formula for scale-free networks, which relates this time to parameters characterizing the traffic dynamics and the network structure such as packet-generation rate and betweenness distribution. The validity of the formula is tested numerically. Our study indicates that increasing the average degree and/or inducing traffic congestion can slow down the spreading process significantly. © 2012 American Institute of Physics.

Chen C.,Fuzhou University | Hou C.,Fuzhou University | Wang Y.,Fuzhou University | Hor T.S.A.,Institute of Materials Research and Engineering of Singapore | And 2 more authors.
Organic Letters | Year: 2014

A catalytic trifluoromethylselenolation of aryl and alkyl halides by a Cu(I) catalyst has been developed. A key intermediate, [(phen)Cu(SeCF3)]2 (5) was successfully isolated and characterized by X-ray diffraction. The important role of silver in the transmetalation process during the catalytic cycle was elucidated. A wide range of trifluoromethylselanes have been prepared from readily available starting materials from a method that tolerates various important functional groups. © 2013 American Chemical Society.

Yang Z.,Fuzhou University | Du G.,University of Wollongong | Meng Q.,University of Wollongong | Guo Z.,University of Wollongong | And 4 more authors.
Journal of Materials Chemistry | Year: 2012

Very large area, uniform TiO 2@carbon composite nanofibers were easily prepared by thermal pyrolysis and oxidization of electrospun titanium(IV) isopropoxide/polyacrylonitrile (PAN) nanofibers in argon. The composite nanostructures exhibit the unique feature of having TiO 2 nanocrystals encapsulated inside a porous carbon matrix. The unique orderly-bonded nanostructure, porous characteristics, and highly conductive carbon matrix favour excellent electrochemical performance of the TiO 2@carbon nanofiber electrode. The TiO 2@carbon hybrid nanofibers exhibited highly reversible capacity of 206 mAh g -1 up to 100 cycles at current density of 30 mA g -1 and excellent cycling stability, indicating that the composite is a promising anode candidate for Li-ion batteries. © The Royal Society of Chemistry 2012.

Yang Z.,Fuzhou University | Meng Q.,University of Wollongong | Guo Z.,University of Wollongong | Yu X.,Fudan University | And 2 more authors.
Energy | Year: 2013

Very large area, uniform Li4Ti5O12/carbon composite nanowebs consisting of interconnected nanofibers were synthesized by a simple method based on thermal pyrolysis and oxidation of a composite of electrospun lithium-titanium/polyacrylonitrile nanowebs in argon atmosphere. This novel composite is characterized by the encapsulation of highly uniform nanoscale Li4Ti5O12 crystals in the porous cotton-like carbon matrix. This unique structure, consisting of ultra-small crystals in carbon core/shell architecture, is also characterized by high porosity, with many nanopores and mesopores in the composite, and this, together with the high conductive carbon matrix, would facilitate the excellent electrochemical performance of Li4Ti5O12/carbon composite nanoweb electrode. The Li4Ti5O12/carbon hybrid nanoweb electrodes display a reversible capacity of approximately 160.8 mAhg-1 at a current density of 30 mAg-1 and excellent cycling stability. The Li4Ti5O12/carbon hybrid nanoweb electrodes also exhibit excellent rate performance, delivering a discharge capacity of over 87 mAhg-1 at a current density of 3000 mAg-1. These results indicate that the composite is a promising anode candidate for lithium ion batteries. © 2013 Elsevier Ltd.

Zheng H.,Shanghai JiaoTong University | Zheng H.,Fuzhou University | Xiao S.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | Tian X.,Shanghai JiaoTong University
Proceedings - IEEE INFOCOM | Year: 2012

In this paper, we study data gathering with compressive sensing from the perspective of in-network computation in random networks, in which n nodes are uniformly and independently deployed in a unit square area. We formulate the problem of data gathering to compute multiround random linear function. We study the performance of in-network computation with compressive sensing in terms of energy consumption and latency in centralized and distributed fashions. For the centralized approach, we propose a tree-based protocol for computing multiround random linear function. The complexity of computation shows that the proposed protocol can save energy and reduce latency by a factor of Θ(√n / log n) for data gathering comparing with the traditional approach, respectively. For the distributed approach, we propose a gossip-based approach and study the performance of energy and latency through theoretical analysis. We show that our approach needs fewer transmissions than the scheme using randomized gossip. © 2012 IEEE.

Fu C.,Hefei University of Technology | Fu C.,Key Laboratory of Process Optimization and Intelligent Decision Making | Wang Y.,Fuzhou University
Computers and Industrial Engineering | Year: 2015

In this paper, the concept of interval difference is firstly defined. Then, an interval difference based evidential reasoning approach is proposed to analyze multiple attribute decision making problems in three situations, including (1) unknown attribute weights and utilities of assessment grades, (2) unknown attribute weights, and (3) unknown utilities of assessment grades. Three optimization models are constructed to identify potentially optimal alternatives in the three situations. For each potentially optimal alternative, three pairs of optimization problems are constructed to generate the optimized intervals of attribute weights and utilities of assessment grades or one of them. By using the optimized intervals, the interval difference of potentially optimal alternatives is calculated and used to generate their rank-order. This process is repeated until all alternatives are identified as potentially optimal alternatives. A complete rank-order of all alternatives is then generated. The performance of six executive cars is assessed using the proposed approach to demonstrate its applicability and validity. © 2015 Elsevier Ltd. All rights reserved.

Yang Z.,Fuzhou University | Meng Q.,University of Wollongong | Guo Z.,University of Wollongong | Yu X.,Fudan University | And 2 more authors.
Journal of Materials Chemistry A | Year: 2013

Highly uniform, relatively large area TiO2/SnO 2/carbon hybrid nanofibers were synthesized by a simple method based on thermal pyrolysis and oxidation of an as-spun titanium-tin/polyacrylonitrile nanoweb composite in an argon atmosphere. This novel composite features the uniform dispersion and encapsulation of highly uniform nanoscale TiO 2/SnO2 crystals in a porous carbon matrix. The high porosity of the nanofiber composite material, together with the conductive carbon matrix, enhanced the electrochemical performance of the TiO 2/SnO2/carbon nanofiber electrode. The TiO 2/SnO2/carbon nanofiber electrode displays a reversible capacity of 442.8 mA h g-1 for up to 100 cycles, and exhibits excellent rate capability. The results indicate that the composite could be a promising anode candidate for lithium ion batteries. © 2013 The Royal Society of Chemistry.

Lin D.,Fuzhou University | Wang Q.,Fuzhou University | Peng K.,Fuzhou University | Shaw L.L.,University of Connecticut
Journal of Power Sources | Year: 2012

In this study, we have investigated the feasibility of forming a new ionic conducting electrolyte from a proton conducting phase, BaCe 0.8Y 0.2O 3-δ (BCY), and an oxygen conducting phase, Ce 0.8Gd 0.2O 1.9 (GDC), in order to decrease the reduction of Ce 4+ ions to Ce 3+ ions in reducing atmospheres at high temperatures. BCY-GDC composite powders (molar ratio 1:1) are synthesized via a one-step citric acid-nitrate gel combustion method. The reaction between the BCY and GDC in these composite powders at 1550 °C results in the formation of a new perovskite phase with a nominal composition of BaCe 1.6Y 0.2Gd 0.2O 4.9-α. The conductivity of the new perovskite phase is found to be substantially (∼150%) higher than that of the composite electrolyte made from the mixture of BCY and GDC with the same nominal composition as the new perovskite phase. The single fuel cells with the new perovskite electrolyte exhibit better electrochemical performance than the cells with the composite electrolyte made of the mixture of BCY and GDC. The maximum power density of single cells with the new perovskite electrolyte can reach 0.657 W cm -2 at 700 °C using humidified hydrogen (3% H 2O) as the fuel. This maximum power density is ∼65% higher than that of the cells with the BCY + GDC composite electrolyte. © 2012 Elsevier B.V. All rights reserved.

Zheng H.,Shanghai JiaoTong University | Zheng H.,Fuzhou University | Xiao S.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | And 2 more authors.
IEEE Transactions on Wireless Communications | Year: 2013

Compressive sensing (CS) provides a new paradigm for efficient data gathering in wireless sensor networks (WSNs). In this paper, with the assumption that sensor data is sparse we apply the theory of CS to data gathering for a WSN where n nodes are randomly deployed. We investigate the fundamental limitation of data gathering with CS for both single-sink and multi-sink random networks under protocol interference model, in terms of capacity and delay. For the single-sink case, we present a simple scheme for data gathering with CS and derive the bounds of the data gathering capacity. We show that the proposed scheme can achieve the capacity Θ(\frac{nW}{M}) and the delay Θ(M\sqrtfrac{nlog n}), where W is the data rate on each link and M is the number of random projections required for reconstructing a snapshot. The results show that the proposed scheme can achieve a capacity gain of Θ (\frac{n}{M}) over the baseline transmission scheme and the delay can also be reduced by a factor of Θ(\fracsqrt{n\log n}{M}). For the multi-sink case, we consider the scenario where n-d sinks are present in the network and each sink collects one random projection from n-s randomly selected source nodes. We construct a simple architecture for multi-session data gathering with CS. We show that the per-session capacity of data gathering with CS is Θ(\frac{n\sqrt{n}W}{M n-d \sqrt{n-s \log n}}) and the per-session delay is Θ(M\sqrtfrac{{n}{log n}}). Finally, we validate our theoretical results for the scaling laws of the capacity in both single-sink and multi-sink networks through simulations. © 2012 IEEE.

Lin J.,Fuzhou University | Liu S.,CAS Zhengzhou Research Institute | Lin X.,Fuzhou University | Xie Z.,Fuzhou University | Xie Z.,Xiamen Huaxia Vocational College
Journal of Chromatography A | Year: 2011

A novel highly hydrophilic polymethacrylate-based monolithic stationary phase based on the copolymerization of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and pentaerythritol triacrylate (PETA) was designed for pressurized capillary electrochromatography. A typical hydrophilic interaction chromatography mechanism could be observed when the content of acetonitrile (ACN) in the mobile phase exceeded 25%. Slight swelling or shrinking with mobile phases of different polarity was observed in permeability studies. Good retentions and efficient separations of polar analytes, such as neutral amides and phenols, were well achieved in hydrophilic interaction chromatography mode with only about 50% ACN content in the mobile phase. It was remarkably lower than the content of ACN (>90%) used on the hydrophilic polymethacrylate-based monoliths reported previously. Additionally, a mixed mode of hydrophilic interaction (HI) and strong cation-exchange (SCX) could be also obtained in the analysis of charged peptides, and high column efficiency up to 80,000. plates/m was achieved without peak tailing. The prepared hydrophilic stationary phase might provide a potential environmental friendly separation media for polar solutes as it consumes a low volume of organic solvents. © 2011 Elsevier B.V.

Ren W.-X.,Central South University | Ren W.-X.,National Engineering Laboratory for High Speed Railway Construction | Fang S.-E.,Fuzhou University | Deng M.-Y.,Zhengzhou Institute of Aeronautical Industry Management
Journal of Engineering Mechanics | Year: 2011

With the aid of the response surface methodology, which is a combination of mathematical and statistical techniques, this paper presents a method for updating a finite-element model based on the measured static responses of structures. Unlike in the traditional model updating procedure, original finite-element models are replaced with response surface models constructed using the uniform design. By this means the complexity of a structure can be easily expressed by explicit functions with low dimensions. A parameter scope shrinking technique is also proposed to construct response surface models. The proposed method is verified against a numerical beam and an experimental full-scale continuous box-girder bridge. It is demonstrated that the proposed response surface-based finite-element-model updating in structural statics has the advantages of easy implementation, high cost-efficiency, and adequate updating accuracy. Once the response surface model that is formulated explicitly is constructed, no finite-element calculation is required in each optimization iteration during updating. Therefore, such finite-element model updating can be easily implemented in practice with available commercial finite-element analysis packages. © 2011 American Society of Civil Engineers.

TAIPEI, Taiwan, Dec. 22, 2016 /PRNewswire/ -- The 2016 Taiwan International Student Design Competition (TISDC) was organized and promoted by the Ministry of Education's Youth Development Administration (YDA) and sponsored by the Sayling Wen Cultural & Educational Foundation and the iSee Taiwan Foundation. The four major categories in the 2016 competition attracted 14,864 entries from 69 countries and regions. The world-class panel of judges included 27 experts in design from 15 international organizations. Its scope of recruitment and evaluation criteria set the stage for the TISDC to become the top international design competition for students worldwide. In addition to the prizes for the entries in the four main categories, the Sayling Wen Cultural & Educational Foundation, with its vision of " Nurture a warmhearted society of humanist devotion and innovative thinking " and its groundings in Education, Innovation, and Caring, directly financed the 2016 YDA's International Design Organization Award, which expanded the number of awards in this category to 15, with a total prize outlay to NT$1.5 million. An official statement by the Sayling Wen Foundation expressed that the foundation hopes to encourage young designers by integrating their creativity with the multifaceted perspectives of international design organizations. For its part, the iSee Taiwan Foundation, in continuing to use culture, tourism and innovation to promote Taiwan's unique character and charms, again sponsored the TISDC Brand Specific Awards. A total of 621 entries were received from students in Taiwan, Mainland China, Singapore, India, Russia, Israel and elsewhere under this year's awards theme "The New Tableware Era - Taiwanese Cuisine & Cutlery Design". The award achieved its aim of helping students and the world experience the essence of Taiwanese culture. This year's TISDC brand-specific category prizes not only added a splash of excitement to the contest but also welcomed the world to partake in Taiwan's deep and vibrantly delicious food culture. The iSee Taiwan Foundation is committed to becoming an important window on Taiwan for the world. At this year's TISDC, the Foundation actively promoted Taiwanese food and culture through its sponsorship of the Brand Specific Category awards. The theme this year was "The New Tableware Era - Taiwanese Cuisine & Cutlery Design", with five 1st Prizes, five 2nd Prizes and eight 3rd Prizes. These five award winners used innovative and exquisitely executed designs in their tableware entries that highlighted Taiwan's food culture. All deeply impressed the judges and earned first prize recognitions. The entry "Hakka Pounded Tea" by students Ying-Chun Lin, Chiao-Chen Wang, Yu-Xuan Huang, and Yi-Chia Chen from Hsing Wu University of Science and Technology combines Hakka lei cha (hand-ground tea) and tableware design. The ingredients for the tea are poured into the container in an entertaining way before being ground into lei cha. The fun design helps capture and convey the beauty of Taiwan's Hakka culture to new generations. "Food-Time Travel" by students Wen-Cheng Tian, Yu-Wen Wang, Ying Cui, and Min Wei from Anyang Institute of Technology enhances the flavors of food over time by pairing 24 of Taiwan's best-known attractions with the traditional "24 seasonal segments" of Chinese tradition. "Rice Bowl of Mountain Scene" by students Po-Chun Chen, Yu-Fang Hung, and Po-Jui Wu uses Taiwan's world famous rice to depict Taiwan's Five Peaks in a sea of clouds. "Impression of Taiwan" by students Guang-HongYao, Bing-Cao Chao, and Meng-Juan Wang from Fuzhou University presents a set of utensils featuring Taiwan's scenery and cuisine for inspiration, reminding users of Taiwan's scenery while enjoying their meal. "Aromatic" by Ying-Chih Wang of Tatung University integrates images of Taiwan's Sun Moon Lake, Alishan's cloud sea, and Yangmingshan's flower season to accentuate the beauty of Taiwan's tourist attractions while users enjoy its exceptional cuisine. 2016 GTDF Strengthens Visitors' Impressions of Taiwan, Increases International Exchange, and Injects New Innovative Energy into Taiwan's Design Industry In order to fully promote the beauty of Taiwanese culture and to take advantage of having so many international designers in Taiwan, the iSee Taiwan Foundation held two tiers of events in conjunction with the 2016 Global Talent Design Festival(GTDF) in October and November. The culture & art heritage-focused International VIP Cultural Tour included visits to the Asia University Museum of Modern Art, Paper Dome, Chung Tai World Museum, and the National Taichung Theater in October and to the National Palace Museum, the Beitou Museum, and northern Taiwan hot springs in November.  The contemporary industrial design-focused Industrial Matching Tour included visits to the National Taiwan Craft Research and Development Institute and the Chungyo Department Store in October and to the Taiwan design centers of Franz and Pegatron in November. Don Chen, CEO of the iSee Taiwan Foundation, noted that his foundation is expanding the level of cultural exchange from tertiary institutions to design industries and is looking forward to injecting new innovative energy into Taiwan's design community through industry-cooperation/synergy-related events and activities. Taiwan International Masters of Design Series Expands Design Vision of Students and Enhances Integration across Disciplines The vision of the Sayling Wen Cultural & Educational Foundation is to "cultivate a humane, caring and innovative society" through the cultivation of exceptional talent and the encouragement of innovative thinking. Taking advantage of the presence of so many world-class jurors in Taiwan, the foundation invited all of TISDC's 11 international jurors to jointly host the Taiwan International Masters of Design Lecture Series on November 29th. The series included lectures by Good Design Australia CEO Brandon Gien (Designing a Better Future), International Poster Biennial (Mexico) founder Xavier Bermudez (Visual Design: A Tool for Social Issues), and INDEX: Design to Improve Life CEO for Communications Adam von Haffner (How to Enhance Your Life, Society and the World). Other lecturers in the series were presented by International Council of Design Vice President Antoine Abi Aad, Thailand Creative & Design Center Managing Director Apisit Laistrooglai, Design Business Chamber of Singapore Honorary Secretary Chee Su Eing, National Institute of Design Director Pradyumna Vyas, International Council of Design President Elect Zachary Haris Ong, and South African Bureau of the Standards Design Institute Senior Manager Polisa Magqibelo. German Design Council Vice Chairman Janine Wunde presented lectures at the lecture series' Tainan venue. The common objectives linking all of the lectures were to expand the design vision of students in Taiwan and to enhance cross-field integration through professional exchange. In addition to planning expert lectures, the Sayling Wen Cultural & Educational Foundation has spared no effort in promoting new services and personnel training. In 2011, the foundation launched World Innovative Service Enabler (WISE), which has facilitated broad-based cooperation with Taiwan's education system. WISE develops and oversees six-month study tours that are designed to create new service industry talent that will be able to transform and upgrade Taiwan's service sector. Board Member & Acting Chief Executive of the Sayling Wen Cultural & Educational Foundation Jeter Her stressed the importance of pre-career learning at the university level. Giving students opportunities to participate in professional training and enterprise implementation activities helps these students gain professional knowledge, which makes them more attractive to employers as proactive drivers of service-industry reform and innovation. Mr. Ted Wen, the incumbent Chairman of the foundation, has declared three core principles for the foundation: Education, Innovation, and Care. Pivoted around these core values is his vision to "Nurture a warmhearted society of humanist devotion and innovative thinking." Going forward, the four pillars of the foundation will be embedding the Chinese culture education in primary and secondary schools, enhancing career skills and teamwork mindset for vocational and college students, promoting lifelong learning in community and advocating service innovation to boost national competitiveness. While Taiwan is on its way toward a sophisticated "Service Economy", the foundation will also continue to devote every effort to promote the four pillars with the aim to breed new service talents, enhance Taiwan's national competitiveness, and play a key enabling role to Taiwan's transformation. The foundation was established by Sayling Wen in 2003. Ted Wen became the Chairman in 2008, and set the Foundation's vision as "becoming an essential portal for the world to see Taiwan" in the three core realms of culture, tourism, and innovation. The dual missions of iSee Taiwan Foundation are to successfully market Taiwan's unique character and heritage globally and to make the world as Taiwan's service market. The foundation focuses on exploring, integrating and promoting the culture and friendly nature of people and places throughout Taiwan, with the goal of creating more opportunities for Taiwan's service industry. The iSee Taiwan Foundation and the Sayling Wen Cultural & Educational Foundation continue to support the TISDC in cooperation with the Ministry of Education. This year, their support has expanded to include the 2016 Global Talent Design Festival (GTDF). The festival offers a new and stimulating array of design-related activities, including: 1) The International Masters Joint University Forum, which will invite representatives from major design organizations worldwide to engage Taiwanese design students and faculty in topical, interactive discussions that spotlight and promote Taiwan's service-oriented strengths; 2) The International VIP Cultural Tour program, which will take visiting design professionals who are in Taiwan for the TISDC on in-depth, topical tours of Taiwan society and culture; and 3) The Industry Joint Reception, which will highlight Taiwan's innate elegance and beauty, which are inexhaustible sources of inspiration for the domestic design industry and the bedrock of ongoing efforts to showcase and promote Taiwan's design strengths to a global audience.

Fang R.,Fuzhou University | Fang R.,Minjiang University | Cheng X.,Fuzhou University | Xu X.,Fuzhou University
Bioresource Technology | Year: 2010

In this paper the Mannich reaction product of dimethylamine, acetone and formaldehyde was grafted onto hydroxymethylated lignin to form a lignin-base cationic polyelectrolyte (L-DAF). L-DAF samples with different cationic strengths and molecular weights were synthesized and characterized. Their performance as a cationic flocculant in removing three anionic azo-dyes (Acid Black, Reactive Red and Direct Red) from simulated dye wastewater was evaluated. The removal of anionic dyes by L-DAF was ascribed to two simultaneous mechanisms, which included coagulation by charge neutralization and flocculation by bridging. There was a different optimum dose of flocculant for each dye wastewater, at which dye removal can reach above 95%. Furthermore, a longer settling time and a lower solution pH increased the efficiency of the decolorization process. During the treatment, more than 89% of chemical oxygen demand (COD) reduction was achieved with sludge production being less than 5.4%. © 2010 Elsevier Ltd. All rights reserved.

Gao Z.,Fuzhou University | Deng K.,Fuzhou University | Wang X.-D.,Karlsruhe Institute of Technology | Miro M.,University of the Balearic Islands | Tang D.,Fuzhou University
ACS Applied Materials and Interfaces | Year: 2014

Nanostructure-based visual assay has been developed for determination of enzymatic activity, but most involve in poor visible color resolution and are not suitable for routine utilization. Herein, we designed a high-resolution colorimetric protocol based on gold/silver core/shell nanorod for visual readout of alkaline phosphatase (ALP) activity by using bare-eyes. The method relied on enzymatic reaction-assisted silver deposition on gold nanorod to generate significant color change, which was strongly dependent on ALP activity. Upon target ALP introduction into the substrate, the ascorbic acid 2-phosphate was hydrolyzed to form ascorbic acid, and then, the generated ascorbic acid reduced silver ion to metal silver and coated on the gold nanorod, thereby resulting in the blue shift of longitudinal localized surface plasmon resonance peak of gold nanorod accompanying a perceptible color change from red to orange to yellow to green to cyan to blue and to violet. Under optimal conditions, the designed method exhibited the wide linear range 5-100 mU mL-1 ALP with a detection limit of 3.3 mU mL-1. Moreover, it could be used for the semiquantitative detection of ALP from 20 to 500 mU mL-1 by using the bare-eyes. The coefficients of variation for intra- and interassay were below 3.5% and 6.2%, respectively. Finally, this method was validated for the analysis of real-life serum samples, giving results matched well with those from the 4-nitrophenyl phosphate disodium salt hexahydrate (pNPP)-based standard method. In addition, the system could even be utilized in the enzyme-linked immunosorbent assay (ELISA) to detect IgG at picomol concentration. With the merits of simplification, low cost, user-friendliness, and sensitive readout, the gold nanorod-based colorimetric assay has the potential to be utilized by the public and opens a new horizon for bioassays. © 2014 American Chemical Society.

Jia X.,Fuzhou University | Jia L.,Fuzhou University | Jia L.,U.S. National Cancer Institute
Current Drug Metabolism | Year: 2012

Photodynamic therapy (PDT) is a new technology using photodynamic effect for disease diagnosis and treatment. It is a two-step technique involving the uptake of a photosensitizer by cancer tissue followed by light irradiation that excites the photosensitizer to produce highly reactive oxygen species, the latter execute apoptosis of cancerous cells. As a second-generation of photosensitizers, phthalocyanine demonstrates higher absorption in the 650-800nm range and short tissue accumulation compared to their first generation. However, many potent phthalocyanine photosensitizers are hydrophobic and poorly water-soluble, which limit their therapeutic applications. As a result, advanced delivery systems and different strategies are called for to improve the effectiveness of PDT. Facts have proved that using nanoparticles as carries of photosensitizers is a very promising route. Nanoparticles have the potentials to increase photosensitizers' aqueous solubility, bioavailability and stability, and deliver photosensitizers to the target tissues. This article reviewed the commonly-used nanoparticles, including colloid gold, quantum dots, paramagnetic nanoparticles, silica-based materials, polymer-based nanoparticles, as potential delivery systems for phthalocyanine photosensitizers, and summarized the improved biological functions of phthalocyanine photosensitizers in PDT. © 2012 Bentham Science Publishers.

Huang H.,East China Jiaotong University | Han L.-H.,Tsinghua University | Tao Z.,Fuzhou University | Zhao X.-L.,Monash University
Journal of Constructional Steel Research | Year: 2010

This paper reports a finite element analysis of the compressive behaviour of CFDST stub columns with SHS (square hollow section) or CHS (circular hollow section) outer tube and CHS inner tube. A set of test data reported by different researchers were used to verify the FE modelling. Typical curves of average stress versus longitudinal strain, stress distributions of concrete, interaction of concrete and steel tubes, as well as effects of hollow ratio on the behaviour of CFDST stub columns, were presented. The influences of important parameters that determine sectional capacities of the composite columns were investigated. © 2009 Elsevier Ltd. All rights reserved.

Lin G.,Minjiang University | Zhu W.,Fuzhou University
IEEE Transactions on Computers | Year: 2014

The max-bisection problem consists in partitioning the vertices of a weighted undirected graph into two equally sized subsets so as to maximize the sum of the weights of crossing edges. It is an NP-hard combinatorial optimization problem that arises in many applications. In this paper, we present a memetic algorithm for the max-bisection problem, which integrates a new fast local search procedure, a crossover operator, and a pool updating strategy. These strategies achieve a balance between intensification and diversification. Extensive experiments were performed on a number of benchmark instances with 800 to 10,000 vertices from the literature. The proposed memetic algorithm improved the best known solutions for all benchmark instances tested in this paper. The improvement in terms of cut value over the CirCut by Burer et al. ranging from 0.02 to 4.15 percent, and the average time of our proposed memetic algorithm is much lower than that of CirCut. It shows that the proposed memetic algorithm can find high quality solutions in an acceptable running time. © 2013 IEEE.

Cheng H.,Fuzhou University | Xiong N.,Georgia State University | Vasilakos A.V.,University of Western Macedonia | Tianruo Yang L.,St. Francis Xavier University | And 2 more authors.
Ad Hoc Networks | Year: 2012

The wireless mesh network is a new emerging broadband technology providing the last-mile Internet access for mobile users by exploiting the advantage of multiple radios and multiple channels. The throughput improvement of the network relies heavily on the utilizing the orthogonal channels. However, an improper channel assignment scheme may lead to network partition or links failure. In this paper we consider the assignment strategy with topology preservation by organizing the mesh nodes with available channels, and aim at minimizing the co-channel interference in the network. The channel assignment with the topology preservation is proved to be NP-hard and to find the optimized solution in polynomial time is impossible. We have formulated a channel assignment algorithm named as DPSO-CA which is based on the discrete particle swarm optimization and can be used to find the approximate optimized solution. We have shown that our algorithm can be easily extended to the case with uneven traffic load in the network. The impact of radio utilization during the channel assignment process is discussed too. Extensive simulation results have demonstrated that our algorithm has good performance in both dense and sparse networks compared with related works. © 2011 Elsevier B.V. All rights reserved.

Hong Z.-S.,Nanjing Southeast University | Zeng L.-L.,Fuzhou University | Cui Y.-J.,ParisTech National School of Bridges and Roads | Cai Y.-Q.,Wenzhou University | Lin C.,University of Kansas
Geotechnique | Year: 2012

The intercept of the log(1 + e)- logσ′ v straight line is introduced to describe the effect of the starting point on the compressibility of natural and reconstituted clays. It is found that when the effective stress exceeds the remoulded yield stress, the compression behaviour of reconstituted clays is controlled solely by the water content at the remoulded yield stress and the liquid limit. Comparison of the compression behaviour of natural and reconstituted clays indicates that their difference in compressibility is caused by soil structure and the difference in water content at the compression starting point. The compression behaviour of natural clays can be classified into three regimes: (a) the pre-yield regime, characterised by small compressibility, with soil structure restraining the deformation up to the consolidation yield stress; (b) the transitional regime, characterised by a gradual loss of soil structure when the effective stress is between the consolidation yield stress and the transitional stress; and (c) the post-transitional regime, characterised by the same change law in compression behaviour as reconstituted clays when the effective stress is higher than the transitional stress. For the investigated clays, the transitional stress is 1.0-3.5 times the consolidation yield stress. The compression index varies solely with the void ratio at an effective stress of 1.0 kPa for both natural clays in the post-transitional regime and reconstituted clays when the effective stress exceeds the remoulded yield stress, and when compressed in such cases the compression curves of both natural clays and reconstituted clays can be well normalised to a unique line using the void index.

Zhou Q.,Fuzhou University | Lei X.-P.,Fuzhou University | Li J.-H.,Fuzhou University | Yan B.-F.,Fuzhou University | And 2 more authors.
Desalination | Year: 2014

Zwitterionic monomer carboxybetaine methacrylate (CBMA) is well known as an excellent hydrophilic and ion adsorption material. Herein, we created a PCBMA layer on PVDF membrane surface via physisorbed free radical polymerization grafting technique (P-FFPG) to improve its hydrophilicity, antifouling and inorganic salts separation property. The key factors of monomer concentration and reaction time which influence grafted density (GD) were investigated in the present work. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) confirmed that the CBMA monomer was grafted onto the membrane successfully. The surface chemistry composition was conducted via X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) analysis clearly showed that the PCBMA layer formed on the membrane surface, and its grafted degree increased with the monomer concentration. The water static contact measurement confirmed that modified PVDF membranes obtained stable enhanced hydrophilicity and superior water adsorption ability. The static protein adsorption at different pH showed a partly pH sensitivity and an improving antifouling ability almost in the whole pH range. The ultrafiltration experiments suggested that the anti-protein fouling of the grafted membranes was significantly improved. The modified membrane possessed a stable initial sodium chloride (NaCl) rejection ratio and reversible flux behavior. © 2014 Elsevier B.V.

Xia Y.,Fuzhou University | Sun C.,Nanjing Southeast University | Zheng W.X.,University of Western Sydney
IEEE Transactions on Neural Networks and Learning Systems | Year: 2012

There is growing interest in solving linear L1 estimation problems for sparsity of the solution and robustness against non-Gaussian noise. This paper proposes a discrete-time neural network which can calculate large linear L1 estimation problems fast. The proposed neural network has a fixed computational step length and is proved to be globally convergent to an optimal solution. Then, the proposed neural network is efficiently applied to image restoration. Numerical results show that the proposed neural network is not only efficient in solving degenerate problems resulting from the nonunique solutions of the linear L1 estimation problems but also needs much less computational time than the related algorithms in solving both linear L1 estimation and image restoration problems. © 2012 IEEE.

Hong Z.-S.,Nanjing Southeast University | Bian X.,Nanjing Southeast University | Cui Y.-J.,ParisTech National School of Bridges and Roads | Gao Y.-F.,Hohai University | Zeng L.-L.,Fuzhou University
Geotechnique | Year: 2013

Isotropically consolidated undrained triaxial compression shear tests were performed on three reconstituted clays to investigate the effect of initial water content w0 on undrained strength behaviour. The values of w0 were adjusted within the range of 10-20 times the liquid limit. The predominant clay mineral is identified as illite for the considered clays, based on a semi-quantitative analysis of the X-ray diffraction patterns. The laboratory tests show that the stress-strain curve in terms of deviator stress against axial strain and the effective stress path in terms of deviator stress against effective mean stress are significantly affected by w0. The undrained strength ratio R*su, defined as the ratio of the undrained shear strength S*u to the isotropic consolidation stress, varies with w0 within a wide spectrum, ranging from 0. 28 to 0. 60 for the three reconstituted clays investigated. The relationship between void index Iv and S*u changes with R*su, and becomes identical to the intrinsic strength line proposed by Chandler when R*su = 0.33. It is also evidenced from the laboratory tests that the value of S*u depends on both the water content and the liquid limit. © 2013 Thomas Telford Ltd.

Jia L.,Fuzhou University | Lu Y.,Fuzhou University | Shao J.,Fuzhou University | Liang X.-J.,National Center for Nanosciences and Technology of China | Xu Y.,University of California at Los Angeles
Trends in Biotechnology | Year: 2013

The complexity of proteomics challenges current methods to provide all peptide mass fingerprints in an ensemble measurement of various proteins at differing concentrations. To detect those low-abundance proteins, nanotechnology provides a technical platform to improve biocompatibility, specificity, reproducibility, and robustness of the current proteomic methods. Here, we comprehensively analyze the weaknesses of traditional proteomic methods and evaluate the importance of nanomaterials in significantly improving the quality of proteomic methods by manipulating individual proteins. We also illustrate how the large surface-to-volume ratio of nanomaterials can facilitate mass transfer, enhance the efficiency of separation and high-throughput capability, and reduce assay time and sample consumption. The marriage of the two subjects and the resulting new nanoproteomics will revolutionize proteomics research. © 2012 Elsevier Ltd.

Huang D.,Atkins | Huang D.,Fuzhou University
Journal of Bridge Engineering | Year: 2012

The purpose of this study is to investigate the dynamic behavior of steel deck-arch bridges with side-by-side multiple vehicle loadings moving over a rough deck. A brief description of analytical theory is provided, including vehicle model, bridge model, and numerical methods. Both vehicle and bridge are treated as three-dimensional models. The effectiveness of mode superposition and Newmark numerical methods are investigated. Most of the important factors that affect the dynamic response of bridges are considered in this study. The effects of the deck, column and arch boundary conditions are also studied, and the analytical impact factors of deck, column, and arch rib are compared with those determined on the basis of current American Association of State Highway and Transportation Officials (AASHTO) specifications. Study results are useful for both bridge engineers and bridge engineering researchers. © 2012 American Society of Civil Engineers.

Zhu W.,Fuzhou University | Lin G.,Fuzhou University | Lin G.,Minjiang University
Computers and Operations Research | Year: 2011

We consider in this paper the nonconvex mixed-integer nonlinear programming problem. We present a mixed local search method to find a local minimizer of an unconstrained nonconvex mixed-integer nonlinear programming problem. Then an auxiliary function which has the same global minimizers and the same global minimal value as the original problem is constructed. Minimization of the auxiliary function using our local search method can escape successfully from previously converged local minimizers by taking increasing values of parameters. For the constrained nonconvex mixed-integer nonlinear programming problem, we develop a penalty based method to convert the problem into an unconstrained one, and then use the above method to solve the later problem. Numerical experiments and comparisons on a set of MINLP benchmark problems show the effectiveness of the proposed algorithm. © 2011 Elsevier Ltd. All rights reserved.

Zhang W.,Fuzhou University | Zhang W.,North Carolina State University | Yuan W.,North Carolina State University | Zhang X.,China Agricultural University | Coronado M.,North Carolina State University
Applied Energy | Year: 2012

This work reports the use of mid- and near-infrared spectroscopy (MIR and NIR) to predict the kinematic and dynamic viscosities of biodiesel-diesel blends. A partial least square regression (PLSR) modeling method was employed to develop the calibration models based on information from four commonly used biodiesel and three different commercial diesel fuels. For MIR spectroscopy, wavelengths in the fingerprint region of 550-1500cm-1 were chosen for developing the model. The root mean square error of prediction (RMSEP) for kinematic viscosity and dynamic viscosity were 0.114 and 0.119mm2/s, respectively, based on the validation set that consisted of 26 biodiesel-diesel blend samples made of six different biodiesel and three different diesel fuels. For the NIR spectroscopy, the PLSR model established using the spectral regions of 1100-1500nm, 1600-1700nm, and 1800-2200nm obtained better results. The RMSEP were 0.070mm2/s for kinematic viscosity and 0.062mm2/s for dynamic viscosity prediction. The results indicated that both MIR and NIR can be used to accurately predict the viscosities of biodiesel-diesel blends, but better results can be obtained using NIR spectroscopy. © 2012 Elsevier Ltd.

Zhang M.,Peking Union Medical College | Xiong Q.,Peking Union Medical College | Chen J.,Tianjin Medical University | Wang Y.,Tianjin Medical University | And 2 more authors.
Polymer Chemistry | Year: 2013

A novel cyclodextrin-containing star polymer was synthesized by atom transfer radical polymerization using the arm-first approach. Copolymerization of a mixture of mono- and multi-methacrylate substituted cyclodextrin and 2-(dimethylamino) ethyl methacrylate initiated by poly(ethylene glycol) macroinitiator produced a core cross-linked star polymer. The star polymer could self-assemble into nanostructures via host-guest interactions between the cyclodextrin polymer and hydrophobic guest molecules. The morphologies of these nanostructures showed regular transitions by altering the type of guest molecule, the ratio of star polymer to guest, and the pH of the solution. Furthermore, doxorubicin (DOX) was entrapped into the star polymer for the purpose of drug delivery. In vitro experiments demonstrated that the DOX-loaded nanoparticles could release their payload in response to the endosomal-pH after being internalized by HeLa cell via endocytosis. At high DOX concentration, DOX-loaded nanoparticles showed significantly higher cell cytotoxicity compared to the free drug. The results indicate that the star polymer has great promise for potential anticancer treatment. © 2013 The Royal Society of Chemistry.

Liu X.,Nanjing Southeast University | Wang Y.-M.,Fuzhou University
International Journal of Uncertainty, Fuzziness and Knowlege-Based Systems | Year: 2013

Based on the current developments of fuzzy weighted average and generalized fuzzy weighted average, especially Karnik-Mendel (KM) algorithms and the works of Wang and Luo (Generalised fuzzy weighted mean and its applications, International Journal of General Systems, 2009, 38, 533-546), the paper analyses some properties of the generalized fuzzy weighted mean (GFWM) and proposes analytical solution method for the GFWM problem. The solution processes and the final solution forms are more simple and accurate than the current GFWM solution, which use samples of the alpha-cuts and get the final solutions approximately. Numerical examples illustrate the analytical solution computing processes for fuzzy weighted average (FWA), fuzzy weighted harmonic mean (FWHM), fuzzy weighted geometric mean (FWGM) and GFWM with exponential and power functions, respectively. © 2013 World Scientific Publishing Company.

Shi Y.,Sun Yat Sen University | Pan Y.,Sun Yat Sen University | Zhang H.,Sun Yat Sen University | Zhang Z.,Sun Yat Sen University | And 3 more authors.
Biosensors and Bioelectronics | Year: 2014

Glutathione (GSH) plays key roles in biological systems and serves many cellular functions. Since biothiols all incorporate thiol, carboxylic and amino groups, discriminative detection of GSH over cysteine (Cys) and homocysteine (Hcy) is still challenging. We herein report a dual-mode nanosensor with both colorimetric and fluorometric readout based on carbon quantum dots and gold nanoparticles for discriminative detection of GSH over Cys/Hcy. The proposed sensing system consists of AuNPs and fluorescent carbon quantum dots (CQDs), where CQDs function as fluorometric reporter, and AuNPs serve a dual function as colorimetric reporter and fluorescence quencher. The mechanism of the nanosensor is based on two distance-dependent phenomenons, color change of AuNPs and FRET. Through controlling the surface properties of as-prepared nanoparticles, the addition of CQDs into AuNPs colloid solution might induce the aggregation of AuNPs and CQDs, leading to AuNPs color changing from red to blue and CQDs fluorescence quench. However, the presence of GSH can protect AuNPs from being aggregated and enlarge the inter-particle distance, which subsequently produces color change and fluorescent signal recovery. The nanosensor described in this report reflects on its simplicity and flexibility, where no further surface functionalization is required for the as-prepared nanoparticles, leading to less laborious and more cost-effective synthesis. The proposed dual-mode nanosensor demonstrated highly selectivity toward GSH, and allows the detection of GSH as low as 50. nM. More importantly, the nanosensor could not only function in aqueous solution for GSH detection with high sensitivity but also exhibit sensitive responses toward GSH in complicated biological environments, demonstrating its potential in bioanalysis and biodection, which might be significant in disease diagnosis in the future. © 2014 Elsevier B.V.

Wang B.,Wuhan Textile University | Wang K.,Fuzhou University
Bioresource Technology | Year: 2013

A continuous batch bioleaching was built to realize the bioleaching of sewage sludge in large scale. In the treatment, heavy metal in acid wastewater of bioleaching was removed by adsorption onto ramie residue. Then, acid wastewater was reused in next bioleaching batch. In this way, most time and water of bioleaching was saved and leaching efficiency of copper, lead and chromium kept at a high level in continuous batch bioleaching. It was found that residual heavy metal in sewage sludge is highly related to that in acid wastewater after bioleaching. To get a high leaching efficiency, concentration of heavy metal in acid wastewater should be low. Adsorption of copper from acid wastewater onto ramie residue can be described by pseudo first-order kinetics equation and Freundlich isotherm model. Trichoderma viride has the potential to be used for the concentration and recovery of heavy metal adsorbed onto ramie residue. © 2013 Elsevier Ltd.

Wang Y.-M.,Fuzhou University | Chin K.-S.,City University of Hong Kong | Luo Y.,Xiamen University
Expert Systems with Applications | Year: 2011

Cross-efficiency evaluation is an effective approach to ranking decision making units (DMUs) that utilize multiple inputs to produce multiple outputs. Its models can usually be developed in a way that is either aggressive or benevolent to other DMUs, depending upon the decision maker (DM)'s subjective preference to the two extreme cases. This paper proposes several new data envelopment analysis (DEA) models for cross-efficiency evaluation by introducing a virtual ideal DMU (IDMU) and a virtual anti-ideal DMU (ADMU). The new DEA models determine input and output weights from the point of view of distance from IDMU or ADMU without the need to be aggressive or benevolent to any DMUs. As a result, the cross-efficiencies measured by these new DEA models are neutral and more logical. Numerical examples are provided to illustrate the potential applications of these new DEA models and their effectiveness in ranking DMUs. © 2011 Published by Elsevier Ltd.

Zhao Y.,Wuhan University of Technology | Zhao Y.,Fuzhou University | Chen F.,Wuhan University of Technology | Shen Q.,Wuhan University of Technology | Zhang L.,Wuhan University of Technology
Optics Express | Year: 2012

In this paper, a graded SiNx and SiOxNy structure is proposed as antireflection coatings deposited on top of amorphous silicon (α-Si) thinfilm solar cell. The structural parameters are optimized by differential evolution in order to enhance the optical absorption of solar cells to the greatest degree. The optimal design result demonstrates that the nonlinear profile of dielectric constant is superior to the linear profile, and discrete multilayer graded antireflection coatings can outperform near continuously graded antireflection coatings. What's more, the electric field intensity distributions clearly demonstrate the proposed graded SiN x and SiOxNy structure can remarkably increase the magnitude of electric field of a-Si:H layer and hence, enhance the light trapping of a-Si:H thin-film solar cells in the whole visible and near-infrared spectrum. Finally, we have compared the optical absorption enhancements of proposed graded SiNx and SiOxNy structure with nanoparticles structure, and demonstrated that it can result in higher enhancements compared to the dielectric SiC and TiO2 nanoparticles. We have shown that the optimal graded SiNx and SiOxN y structure optimized by differential evolution can reach 33.31% enhancement which has exceeded the ideal limit of 32% of nanoparticles structure including plasmonic Ag nanoparticles, dielectric SiC and TiO2 nanoparticles. © 2012 Optical Society of America.

Tao Z.,University of Western Sydney | Wang Z.-B.,Fuzhou University | Wang Z.-B.,Tsinghua University | Yu Q.,Tsinghua University
Journal of Constructional Steel Research | Year: 2013

Due to the passive confinement provided by the steel jacket for the concrete core, the behaviour of the concrete in a concrete-filled steel tubular (CFST) column is always very challenging to be accurately modelled. Although considerable efforts have been made in the past to develop finite element (FE) models for CFST columns, these models may not be suitable to be used in some cases, especially when considering the fast development and utilisation of high-strength concrete and/or thin-walled steel tubes in recent times. A wide range of experimental data is collected in this paper and used to develop refined FE models to simulate CFST stub columns under axial compression. The simulation is based on the concrete damaged plasticity material model, where a new strain hardening/softening function is developed for confined concrete and new models are introduced for a few material parameters used in the concrete model. The prediction accuracy from the current model is compared with that of an existing FE model, which has been well established and widely used by many researchers. The comparison indicates that the new model is more versatile and accurate to be used in modelling CFST stub columns, even when high-strength concrete and/or thin-walled tubes are used. © 2013 Elsevier Ltd.

Chen X.,Jimei University | Chen X.,Kyoto University | Cai Z.,Fuzhou University | Oyama M.,Kyoto University | Chen X.,Xiamen University
Carbon | Year: 2014

Bimetallic PtPd nanocubes supported on graphene nanosheets (PtPdNCs/GNs) were prepared by a rapid, one-pot and surfactant-free method, in which N,N-dimethylformamide (DMF) was used as a bi-functional solvent for the reduction of both metal precursors and graphene oxide (GO) and for the surface confining growth of PtPdNCs. The morphology, structure and composition of the thus-prepared PtPdNCs/GNs were characterized by transmission electron microscopy (TEM), high resolution TEM, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Because no surfactant or halide ions were involved in the proposed synthesis, the prepared PtPdNCs/GNs were directly modified onto a glassy carbon electrode and showed high electrocatalytic activity for methanol oxidation in cyclic voltammetry without any pretreatments. Moreover, with the synergetic effects of Pt and Pd and the enhanced electron transfer by graphene, the PtPdNCs/GNs composites exhibited higher electrocatalytic activity (j p = 0.48 A mg-1) and better tolerance to carbon monoxide poisoning (If/Ib = 1.27) compared with PtPd nanoparticles supported on carbon black (PtPdNPs/C) (jp = 0.28 A mg-1; If/Ib = 1.01) and PtNPs/GNs (jp = 0.33 A mg-1; If/Ib = 0.95). This approach demonstrates that the use of DMF as a solvent with heating is really useful for reducing GO and metal precursors concurrently for preparing clean metal-graphene composites. © 2013 Elsevier Ltd. All rights reserved.

Lin L.-S.,Fuzhou University | Cong Z.-X.,Fuzhou University | Cao J.-B.,Xiamen University | Ke K.-M.,Fuzhou University | And 5 more authors.
ACS Nano | Year: 2014

Multifunctional nanocomposites have the potential to integrate sensing, diagnostic, and therapeutic functions into a single nanostructure. Herein, we synthesize Fe3O4@polydopamine core-shell nanocomposites (Fe3O4@PDA NCs) through an in situ self-polymerization method. Dopamine, a melanin-like mimic of mussel adhesive proteins, can self-polymerize to form surface-adherent polydopamine (PDA) films onto a wide range of materials including Fe3O4 nanoparticles used here. In such nanocomposites, PDA provides a number of advantages, such as near-infrared absorption, high fluorescence quenching efficiency, and a surface for further functionalization with biomolecules. We demonstrate the ability of the Fe3O4@PDA NCs to act as theranostic agents for intracellular mRNA detection and multimodal imaging-guided photothermal therapy. This work would stimulate interest in the use of PDA as a useful material to construct multifunctional nanocomposites for biomedical applications. © 2014 American Chemical Society.

Han Z.,Tianjin Polytechnic University | Dong Y.,Tianjin Polytechnic University | Dong Y.,Fuzhou University | Dong S.,Tsinghua University
Journal of Hazardous Materials | Year: 2011

A series of Cu-Fe bimetal amidoximated polyacrylonitrile (PAN) fiber complexes with different molar ratios of Cu 2+ to Fe 3+ ions was prepared using a simple exhaustion method, and characterized using FTIR, DRS and XPS, respectively. Then they were tested as the heterogeneous Fenton catalysts for Rhodamine B degradation with H 2O 2 in the dark and under visible light irradiation. The results indicated that Cu-Fe bimetal amidoximated PAN fiber complexes could more effectively catalyze the dye degradation in water than Fe amidoximated PAN fiber complex, especially in the dark. And introduction of Cu 2+ ions significantly increased their catalytic performance. 0.56 was the optimum molar ratio of Cu 2+ to Fe 3+ ions to achieve the best catalytic activity and stability. This was mainly due to the synergetic effect in the bimetal complexes. Visible light irradiation improved the catalytic activity of the complexes, especially with a low molar ratio of Cu 2+ to Fe 3+ ions. © 2011 Elsevier B.V.

Xiong D.,Fuzhou University | Zhang Y.,Xiamen University | Zhao H.,Xiamen University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

We show numerically that introducing the next-nearest-neighbor interactions (of appropriate strength) into the one-dimensional (1D) Fermi-Pasta-Ulam-β (FPU-β) lattice can result in an unusual, nonmonotonic temperature dependent divergence behavior in a wide temperature range, which is in clear contrast to the universal divergence manner independent of temperature as suggested previously in the conventional 1D FPU-β models with nearest-neighbor (NN) coupling only. We also discuss the underlying mechanism of this finding by analyzing the temperature variations of the properties of discrete breathers, especially that with frequencies having the intraband components. The results may provide useful information for establishing the connection between the macroscopic heat transport properties and the underlying dynamics in general 1D systems with interactions beyond NN couplings. © 2014 American Physical Society.

Chen J.,Fuzhou University | Zhu W.,Fuzhou University | Ali M.M.,University of Witwatersrand
IEEE Transactions on Systems, Man and Cybernetics Part C: Applications and Reviews | Year: 2011

Floorplanning in very large scale integrated-circuit (VLSI) design is the first phase in the process of designing the physical layout of a chip. This makes the floorplanning problem of paramount importance, since it determines the performance, size, yield, and reliability of VLSI chips. From the computational point of view, the VLSI floorplanning is an NP-hard problem. In this paper, we present a hybrid simulated annealing algorithm (HSA) for nonslicing VLSI floorplanning. The HSA uses a new greedy method to construct an initial B*-tree, a new operation on the B*-tree to explore the search space, and a novel bias search strategy to balance global exploration and local exploitation. Experimental results on Microelectronic Center of North Carolina (MCNC) benchmarks show that the HSA can quickly produce optimal or nearly optimal solutions for all the tested problems. © 2010 IEEE.

Zhou J.,Fuzhou University | Zhou J.,Guangdong Ocean University | Lai W.,Fuzhou University | Zhuang J.,Fuzhou University | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2013

A novel and in situ amplified immunoassay strategy with quadruple signal amplification was designed for highly efficient electrochemical detection of low-abundance proteins (carcinoembryonic antigen, CEA, as a model) by using nanogold-functionalized DNAzyme concatamers with redox-active intercalators. To construct such an in situ amplification system, streptavidin-labeled gold nanoparticles (AuNP-SA) were initially used for the labelling of initiator strands (S0) and detection antibody (mAb2) with a large ratio (mAb2-AuNP-S0), and then two auxiliary DNA strands S1 and S2 were designed for in situ propagation of DNAzyme concatamers with the hemin/G-quadruplex format. The quadruple signal amplification was implemented by using the avidin-biotin chemistry, nanogold labels, DNA concatamers, and DNAzymes. In the presence of target CEA, the sandwiched immunocomplex was formed between the immobilized primary antibodies on the electrode and the conjugated detection antibodies on the mAb 2-AuNP-S0. The carried S0 initiator strands could progress a chain reaction of hybridization events between alternating S1/S2 DNA strands to form a nicked double-helix. Upon addition of hemin, the hemin-binding aptamers could be bound to form the hemin/G-quadruplex-based DNAzymes. The formed double-helix DNA polymers could cause the intercalation of numerous electroactive methylene blue molecules. During the electrochemical measurement, the formed DNAzymes could catalyze the reduction of H2O2 in the solution to amplify the electrochemical signal of the intercalated methylene blue. Under optimal conditions, the electrochemical immunoassay exhibited a wide dynamic range of 1.0 fg mL-1 to 20 ng mL-1 toward CEA standards with a low detection limit of 0.5 fg mL-1. Intra-assay and inter-assay coefficients of variation (CV) were less than 8.5% and 11.5%, respectively. No significant differences at the 0.05 significance level were encountered in the analysis of 14 clinical serum specimens between the developed immunoassay and commercialized electrochemiluminescent (ECL) method for detection of CEA. © 2013 American Chemical Society.

Lu C.-H.,Fuzhou University | Zhang Y.,Fuzhou University | Tang S.-F.,Fuzhou University | Fang Z.-B.,Fuzhou University | And 3 more authors.
Biosensors and Bioelectronics | Year: 2012

We have developed a biomimetic sensor for the detection of human immunodeficiency virus type 1 (HIV-1) related protein (glycoprotein 41, gp41) based on epitope imprinting technique. gp41 is the transmembrane protein of HIV-1 and plays an important role in membrane fusion between viruses and infected cells. It is an important index for determining the extent of HIV-1 disease progression and the efficacy of therapeutic intervention. In this work, dopamine was used as the functional monomer and polymerized on the surface of quartz crystal microbalance (QCM) chip in the presence of template, a synthetic peptide with 35 amino acid residues, analogous to residues 579-613 of the gp41. This process resulted in grafting a hydrophilic molecularly imprinted polymer (MIP) film on the QCM chip. QCM measurement showed that the resulting MIP film not only had a great affinity towards the template peptide, but also could bind the corresponding gp41 protein specifically. The dissociation constant (K d) of MIP for the template peptide was calculated to be 3.17nM through Scatchard analysis, which was similar to those of monoclonal antibodies. Direct detection of the gp41 was achieved quantitatively using the resulting MIP-based biomimetic sensor. The detection limit of gp41 was 2ng/mL, which was comparable to the reported ELISA method. In addition, the practical analytical performance of the sensor was examined by evaluating the detection of gp41 in human urine samples with satisfactory results. © 2011 Elsevier B.V.

Wang Y.-M.,Fuzhou University | Luo Y.,Xiamen University | Lan Y.-X.,Fuzhou University
Expert Systems with Applications | Year: 2011

Existing methods for generating common weights in data envelopment analysis (DEA) are either very complicated or unable to produce a full ranking for decision making units (DMUs). This paper proposes a new methodology based on regression analysis to seek a common set of weights that are easy to estimate and can produce a full ranking for DMUs. The DEA efficiencies obtained with the most favorable weights to each DMU are treated as the target efficiencies of DMUs and are best fitted with the efficiencies determined by common weights. Two new nonlinear regression models are constructed to optimally estimate the common weights. Four numerical examples are examined using the developed new models to test their discrimination power and illustrate their potential applications in fully ranking DMUs. Comparisons with a similar compromise approach for generating common weights are also discussed. © 2011 Published by Elsevier Ltd.

Chen Q.-Q.,Fuzhou University | Xia Y.,Fuzhou University | Xia Y.,Dalian University of Technology | An N.B.,Institute of Physics
Optics Communications | Year: 2011

In this work, we propose a scheme to realize a joint remote preparation of an arbitrary three-qubit state using six EPR-type pairs as the shared quantum resource. By determining the right measurement bases for the preparers and right ancilla-assisted unitary transformation/recovery operations for the receiver, our scheme applies to the most general case when all the coefficients of the state to be prepared and the EPR-type pairs are complex. The total success probability is found to be dependent only on the "smaller" coefficients of the EPR-type pairs shared between the receiver and one of the preparers. © 2011 Elsevier B.V. All rights reserved.

Chen X.,Xiamen University | Cai Z.-X.,Fuzhou University | Liu C.-C.,Fuzhou University | Wu G.-H.,Xiamen University | Chen X.-M.,Jimei University
Electrochimica Acta | Year: 2013

A facile spontaneous redox method is developed to obtain uniform palladium nanoparticles (PdNPs) distributed on surfactant-functionalized multi-walled carbon nanotubes (MWCNTs) at room temperature. In this synthesis, hexadecyltrimethylammonium bromide (CTAB) was self-assembled onto MWCNTs to provide adsorption sites for PdCl4 2- ions. Interestingly, PdCl4 2- was spontaneously reduced though a galvanic cell effect between PdCl4 2- and MWCNTs. The as-prepared Pd catalyst showed excellent catalytic activity toward oxidation of ethanol and glucose in an alkaline medium. Inspired by this, a glucose enzyme-free biosensor was developed with a wide linear range covering from 1 mM to 20 mM and a high sensitivity of 11 μA mM-1 cm-2 (to 1-10 mM) and 6.3 μA mM-1 cm-2 (to 11-20 mM). These results indicate that the as-synthesized Pd catalyst could be a great potential material for improving performance of direct ethanol fuel cells and glucose sensors. © 2013 Elsevier Ltd. All rights reserved.

Chen X.,Jimei University | Chen X.,Kyoto University | Wu G.,Xiamen University | Wu G.,Ningde Amperex Technology Ltd. | And 3 more authors.
Microchimica Acta | Year: 2014

Enzyme-free (also called non-enzymatic or direct) electrochemical sensors have been widely used for the determination of hydrogen peroxide, glucose, and uric acid. This review covers the recent progress made in this field. We also discuss the respective sensor materials which have strong effect on the electro-catalytic properties of the electrodes and govern the performance of these sensors. In addition, perspectives and current challenges of enzyme-free electrochemical sensors are outlined. Contains 142 references. [Figure not available: see fulltext.] © 2013 Springer-Verlag Wien.

Hao S.-Y.,Fuzhou University | Xia Y.,Fuzhou University | Xia Y.,Dalian University of Technology | Song J.,Harbin Institute of Technology | An N.B.,Institute of Physics
Journal of the Optical Society of America B: Optical Physics | Year: 2013

We propose a scheme to deterministically generate Greenberger-Horne- Zeilinger states of N ≥ 3 atoms trapped in spatially separated cavities connected by optical fibers. The scheme is based on the technique of fractional stimulated Raman adiabatic passage, which is a one-step technique in the sense that one needs only to wait for the desired entangled state to be generated in the stationary regime. The parametrized shapes of the Rabi frequencies of the classical fields that drive the two end atoms are chosen appropriately to realize the scheme. We also show numerically that the proposed scheme is insensitive to fluctuations of the pulses' parameters and, at the same time, that it is robust against decoherence caused by the dissipation due to fiber decay. Moreover, a relatively high fidelity can be obtained even in the presence of cavity decay and atomic spontaneous emission. © 2013 Optical Society of America.

Lu M.,Fuzhou University | Xia Y.,Fuzhou University | Song J.,Harbin Institute of Technology | An N.B.,Institute of Physics
Journal of the Optical Society of America B: Optical Physics | Year: 2013

We propose a feasible and efficient scheme to generate N-atom W-class states in spatially separated cavities without using any classical driving pulses. We adopt the model in which the couplings between different atoms are mediated only by virtual excitations of the cavity and fiber fields, so the scheme is insensitive to the cavity decay and fiber photon leakage. We carry out both theoretical investigation in a decoherence-free subspace and numerical calculation accounting for decoherence due to the atomic spontaneous emission as well as the decay of cavity and fiber modes. The theoretical and numerical results agree in the large atom-cavity detuning regime. Our scheme proves to be useful in scalable distributed quantum networks. © 2013 Optical Society of America.

Li D.,Tohoku University | Li D.,Fuzhou University | Nakagawa Y.,Tohoku University | Tomishige K.,Tohoku University
Applied Catalysis A: General | Year: 2011

Nickel is an effective component for the steam reforming of methane in terms of the catalytic activity and the catalyst cost. When Ni catalysts are applied to dry reforming, oxidative reforming, and catalytic partial oxidation, it is necessary to add the properties of high resistance to oxidation, hot spot formation, and coke deposition, to the Ni catalysts. An efficient method for giving these properties while considering the catalyst cost is the modification of Ni metal particles with small amounts of noble metals. An important point is that preparation methods can affect the structure of noble metal-Ni bimetallic particles, which is connected to the catalytic performances. The additive effects of noble metals on the catalytic performances are summarized in terms of activity, suppression of Ni oxidation, carbon formation, self-activation, and sustainability in the daily startup and shutdown operations. © 2011 Elsevier B.V.

Li D.-F.,Fuzhou University | Nan J.-X.,Guilin University of Electronic Technology
International Journal of Fuzzy System Applications | Year: 2011

This paper extends the technique for order preference by similarity to ideal solution (TOPSIS) for solving multi-attribute group decision making (MAGDM) problems under Atanassov intuitionistic fuzzy set (IFS) environments. In this methodology, weights of attributes and ratings of alternatives on attributes are extracted from fuzziness inherent in decision data and making process and described using Atanassov IFSs. An Euclidean distance measure is developed to calculate the differences between alternatives for each decision maker and an Atanassov IFS positive ideal solution (IFSPIS) as well as an Atanassov IFS negative idealsolution (IFSNIS). Degrees of relative closeness to the Atanassov IFSPIS for all alternatives with respect to each decision maker in the group are calculated. Then all decision makers in the group may be regarded as attributes and a corresponding classical MADM problem is generated and hereby solved by the TOPSIS. The proposed methodology is validated and compared with other similar methods. A numerical example is examined to demonstrate the implementation process of the methodology proposed in this paper. © 2011, IGI Global.

Uy B.,University of Western Sydney | Tao Z.,University of Western Sydney | Tao Z.,Fuzhou University | Han L.-H.,Tsinghua University
Journal of Constructional Steel Research | Year: 2011

In this paper, a series of tests were carried out on short and slender concrete-filled stainless steel tubular columns to explore their performance under axial compression or combined actions of axial force and bending moment. Empty short steel hollow sections were also tested for comparison. The test results showed that the performance of the composite columns was quite good and have the potential to be used extensively as structural members. Comparisons of the test results were also made with several existing design methods for conventional concrete-filled carbon steel tubular columns as presented in Australian standard AS 5100 (2004), American code AISC (2005), Chinese code DBJ/T 13-51-2010 (2010), and Eurocode 4 (2004), which indicates that all the codes are somewhat conservative in predicting the load-carrying capacities of both short and slender columns. © 2010 Elsevier B.V. All rights reserved.

Wang Y.-M.,Fuzhou University | Luo Y.,Xiamen University
Mathematical and Computer Modelling | Year: 2010

This paper proposes a correlation coefficient (CC) and standard deviation (SD) integrated approach for determining the weights of attributes in multiple attribute decision making (MADM) and a global sensitivity analysis to the weights determined. The CCSD integrated approach determines the weights of attributes by considering SD of each attribute and their CCs with the overall assessment of decision alternatives, where CCs are determined by removing each attribute from the overall assessment of decision alternatives. If the CC for an attribute turns out to be very high, then the removal of this attribute has little effect on decision making; otherwise, the attribute should be given an important weight. The global sensitivity analysis to the weights of attributes is proposed to ensure the stability of the best decision alternative or alternative ranking. A numerical example about the economic benefit assessment of the industrial economy of China is investigated to illustrate the potential applications of the CCSD method in determining the weights of attributes. Comparisons with existing weight generation methods are also discussed. © 2009 Elsevier Ltd. All rights reserved.

Li M.-J.,University of Hong Kong | Li M.-J.,Fuzhou University | Wong K.M.-C.,University of Hong Kong | Yi C.,Sun Yat Sen University | Yam V.W.-W.,University of Hong Kong
Chemistry - A European Journal | Year: 2012

Two new bichromophoric ruthenium(II) complexes, [Ru(bpy) 2(bpy-CM)](PF 6) 2 and [Ru(bpy) 2(bpy-CM343)](PF 6) 2 (bpy=2,2'-bipyridine, CM=coumarin) with appended coumarin ligands have been designed and synthesized. The energy-transfer-based sensing of esterase by the complexes has been studied by using UV/Vis and luminescence spectroscopic methods. The cytotoxicity and the cellular uptake of one of the complexes have also been investigated. Woodruff-not only tasty! Two new bichromophoric ruthenium(II) complexes with appended coumarin ligands have been synthesized. The energy-transfer-based sensing of esterase by the complexes was studied by using UV/Vis and luminescence spectroscopy. The Ru II complex containing a coumarin 343 derivative was found to exhibit only a slight cytotoxicity towards HepG2 cells, and it was easily taken up in the living cells to show evident response to the esterase (see figure). Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Lin B.,Fuzhou University | Lin B.,Xiamen University | Moubarak M.,Xiamen University
Energy | Year: 2014

The objective of this paper is to estimate the energy saving potential in China's paper industry by determining energy intensity under different scenarios. Cointegration model and stability test are applied to formulate the equilibrium equation. Results show that energy price, industry structure, profit margin and technology have significant impact as they are negatively correlated to changes in energy intensity. Three scenarios (BAU (business as usual), intermediate and active) are designed to estimate the future trend of energy intensity in paper industry. In 2010, the energy intensity (energy consumption per unit of value added) was 4tce/10,000RMB, and by the scenarios it is expected to considerably decline. According to the BAU (business as usual) scenario, the energy intensity will decrease to 2.56, 1.43 and 0.70tce/10,000RMB by 2015, 2020 and 2025, respectively. With respect to the intermediate scenario it is expected to drop further to 0.44tce/10,000RMB. Yet by the active scenario, the energy intensity is expected to considerably decline to 0.36tce/10,000RMB by 2025. Using the BAU forecast as a baseline, the quantity of energy savings is estimated to be 185.6 billion tce by 2025. Considering this important potential, we also provided some policy suggestions. © 2013 Elsevier Ltd.

Lu C.-H.,Fuzhou University | Zhu C.-L.,First Institute of Oceanography | Li J.,Fuzhou University | Liu J.-J.,Fuzhou University | And 3 more authors.
Chemical Communications | Year: 2010

We have proved that functionalized nanoscale graphene oxide can protect oligonucleotides from enzymatic cleavage and efficiently deliver oligonucleotides into cells. © The Royal Society of Chemistry 2010.

Zhang Y.Y.,Fuzhou University | Zhang Y.Y.,University of Western Sydney | Gu Y.T.,Queensland University of Technology
Computational Materials Science | Year: 2013

Herein the mechanical properties of graphene, including Young's modulus, fracture stress and fracture strain have been investigated by molecular dynamics simulations. The simulation results show that the mechanical properties of graphene are sensitive to the temperature changes but insensitive to the layer numbers in the multilayer graphene. Increasing temperature exerts adverse and significant effects on the mechanical properties of graphene. However, the adverse effect produced by the increasing layer number is marginal. On the other hand, isotope substitutions in graphene play a negligible role in modifying the mechanical properties of graphene. © 2013 Elsevier B.V. All rights reserved.

Li D.,Fuzhou University | Koike M.,Tohoku University | Wang L.,Tohoku University | Nakagawa Y.,Tohoku University | And 2 more authors.
ChemSusChem | Year: 2014

Nickel-iron/magnesium/aluminum bimetallic catalysts were prepared by the calcination and reduction of nickel-magnesium-iron-aluminum hydrotalcite-like compounds. Characterization suggests that, at iron/nickel≤0.5, both nickel and iron species are homogeneously distributed in the hydrotalcite precursor and incorporated into the Mg(Ni, Fe, Al)O periclase after calcination, giving rise to uniform nickel-iron alloy nanoparticles after reduction. Ni-Fe/Mg/Al (Fe/Ni=0.25) exhibits the best catalytic performance for the steam reforming of tar derived from the pyrolysis of biomass. It is suggested that the uniform nickel-iron alloy nanoparticles and the synergy between nickel and iron are responsible for the high catalytic performance. Moreover, the Ni-Fe/Mg/Al catalyst exhibits much better regenerability toward oxidation-reduction treatment for the removal of deposited coke than that of conventional Ni-Fe/α-Al2O3. This property can be attributed to the better regeneration of Ni-Fe alloy nanoparticles through the formation and reduction of Mg(Ni, Fe, Al)O. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhou J.,Fuzhou University | Zhou J.,Guangdong Ocean University | Tang J.,Fuzhou University | Chen G.,Fuzhou University | Tang D.,Fuzhou University
Biosensors and Bioelectronics | Year: 2014

A new sandwich-type electrochemical immunosensor based on nanosilver-doped bovine serum albumin microspheres (Ag@BSA) with a high ratio of horseradish peroxidase (HRP) and detection antibody was developed for quantitative monitoring of biomarkers (carcinoembryonic antigen, CEA, used in this case) by coupling enzymatic biocatalytic precipitation with tyramine signal amplification strategy on capture antibody-modified glassy carbon electrode. Two immunosensing protocols (with and without tyramine signal amplification) were also investigated for the detection of CEA and improved analytical features were acquired with tyramine signal amplification strategy. With the labeling method, the performance and factors influencing the electrochemical immunoassay were studied and evaluated in detail. Under the optimal conditions, the electrochemical immunosensor exhibited a wide dynamic range of 0.005-80ngmL-1 toward CEA standards with a low detection limit of 5.0pgmL-1. Intra- and inter-assay coefficients of variation were below 11%. No significant differences at the 0.05 significance level were encountered in the analysis of 6 clinical serum specimens and 6 spiked new-born cattle serum samples between the electrochemical immunoassay and the commercialized electrochemiluminescent immunoassay method for the detection of CEA. © 2013 Elsevier B.V.

Xiong D.,Fuzhou University | Zhang Y.,Xiamen University | Zhao H.,Xiamen University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

In lattice systems, the effects of optical phonons on heat transport are usually neglected due to their relatively small group velocities compared with acoustic phonons, or even assumed to be negative because introducing optical phonons may simultaneously reduce the group velocities of acoustic phonons. In order to well understand the role played by optical phonons, we propose a one-dimensional anharmonic lattice model with alternating interactions, where the optical phonons can be conveniently tuned. We find that in contrast to previous studies, the optical phonons (in coordination with the nonlinearities) can enhance heat transport in the thermodynamical limit, suggesting that optical phonons can also play an active role. The underlying mechanism is related to the effects of two kinds of nonlinear excitations, i.e., the optical and the gap discrete breathers (DBs). These DBs release energy and in turn facilitate heat transport. © 2013 American Physical Society.

Zhang Z.,Sun Yat Sen University | Wang Q.,Fuzhou University | Li G.,Sun Yat Sen University
Analytica Chimica Acta | Year: 2012

In the study, nanoporous array anodic alumina (NAAA) prepared by a simple, rapid and stable two-step anodic oxidization method was introduced as a novel solid-phase microextraction (SPME) fiber coating. The regular nanoporous array structure and chemical composition of NAAA SPME fiber coating was characterized and validated by scanning electron microscopy and energy dispersive spectroscopy, respectively. Compared with the commercial polydimethylsiloxane (PDMS) SPME fiber coating, NAAA SPME fiber coating achieved the higher enrichment capability (1.7-4.7 folds) for the mixed standards of volatile organic compounds (VOCs). The selectivity for volatile alcohols by NAAA SPME fiber coating demonstrated an increasing trend with the increasing polarity of alcohols caused by the gradually shortening carbon chains from 1-undecanol to 1-heptanol or the isomerization of carbon chains of some typical volatile alcohols including 2-ethyl hexanol, 1-octanol, 2-phenylethanol, 1-phenylethanol, 5-undecanol, 2-undecanol and 1-undecanol. Finally, NAAA SPME fiber coating was originally applied for the analysis of biological VOCs of Bailan flower, stinkbug and orange peel samples coupled with gas chromatography-mass spectrometry (GC-MS) detection. Thirty, twenty-seven and forty-four VOCs of Bailan flower, stinkbug and orange peel samples were sampled and identified, respectively. Moreover, the contents of trace 1-octanol and nonanal of real orange peel samples were quantified for the further method validation with satisfactory recoveries of 106.5 and 120.5%, respectively. This work proposed a sensitive, rapid, reliable and convenient analytical method for the potential study of trace and small molecular biological VOCs by the novel NAAA SPME fiber coating. © 2012 Elsevier B.V.

Chen J.,Xiamen University | Chen J.,Fuzhou University | Guo X.,Xiamen University
Match | Year: 2011

The atom-bond connectivity (ABC) index of a graph G, is defined as the sum of the weights (du+du-2/dudu) 1/2 of all edges uv of G, where du denotes the degree of a vertex u in G. The ABC index provides a good model for the stability of linear and branched alkanes as well as the strain energy of cycloalkanes. In this paper, we characterize the catacondensed hexagonal systems with extreme ABC indices, and prove that the ABC index of a graph decreases when any edge is deleted. Consequently, it is also proved that the graph with n vertices and the maximum ABC index is the complete graph Kn.

Lu C.-H.,Fuzhou University | Li J.,Fuzhou University | Liu J.-J.,Fuzhou University | Yang H.-H.,Fuzhou University | And 2 more authors.
Chemistry - A European Journal | Year: 2010

Here, we report a novel, highly sensitive, selective and economical molecular beacon using graphene oxide as the"nanoquencher". This novel molecular beacon system contains a hairpin-structured fluorophorelabeled oligonucleotide and a graphene oxide sheet. The strong interaction between hairpin-structured oligonucleotide and graphene oxide keep them in close proximity, facilitating the flúores-cence quenching of the fluorophore by graphene oxide. In the presence of a complementary target DNA, the binding between hairpin-structured oligonucleotide and target DNA will disturb the interaction between hairpin-struc-tured oligonucleotide and graphene oxide, and release the oligonucleotide from graphene oxide, resulting in restoration of fluorophore fluorescence. In the present study, we show that this novel graphene oxide quenched molecular beacon can be used to detect target DNA with higher sensitivity and single-base mismatch selectivity compared to the conventional molecular beacon. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA,.

Nan J.-X.,Guilin University of Electronic Technology | Li D.-F.,Fuzhou University
International Journal of Computational Intelligence Systems | Year: 2013

Adding an additional degree of non-membership, K. T. Atanassov introduced the concept of the intuitionistic fuzzy (IF) set (IF-set), which has rarely been applied to the game theory yet. The aim of this paper is to develop the concept and methodology of matrix games with IF-set goals in which goals of players are expressed with IF-sets and payoffs are expressed with real numbers rather than IF-sets. In this methodology, the concepts of IF-set goals and the solutions of matrix games with IF-set goals are proposed. It is proven that solutions of matrix games with IF-set goals can be obtained through solving the developed auxiliary linear programming models, which are the generalization of matrix games with fuzzy goals. The proposed methodology is illustrated with a numerical example. Furthermore, comparison analysis of the proposed methodology is conducted to show its advantages over matrix games with fuzzy goals. © 2013 Copyright the authors.

Li D.,Fuzhou University | Tamura M.,Tohoku University | Nakagawa Y.,Tohoku University | Tomishige K.,Tohoku University
Bioresource Technology | Year: 2015

Biomass gasification is one of the most important technologies for the conversion of biomass to electricity, fuels, and chemicals. The main obstacle preventing the commercial application of this technology is the presence of tar in the product gas. Catalytic reforming of tar appears a promising approach to remove tar and supported metal catalysts are among the most effective catalysts. Nevertheless, improvement of catalytic performances including activity, stability, resistance to coke deposition and aggregation of metal particles, as well as catalyst regenerability is greatly needed. This review focuses on the design and catalysis of supported metal catalysts for the removal of tar in the gasification of biomass. The recent development of metal catalysts including Rh, Ni, Co, and their alloys for steam reforming of biomass tar and tar model compounds is introduced. The role of metal species, support materials, promoters, and their interfaces is described. © 2014 Elsevier Ltd.

Xia Y.,Fuzhou University | Xia Y.,Dalian University of Technology | Chen Q.-Q.,Fuzhou University | An N.B.,Institute of Physics
Journal of Physics A: Mathematical and Theoretical | Year: 2012

In this work, a useful protocol for deterministic joint remote preparation of an arbitrary three-qubit state using only Einstein-Podolsky-Rosen pairs is put forward. Our protocol, in clear contrast with a previous one, works for a receiver who, due to limited local equipments, is unable to carry out any measurements and controlled-NOT gates as well as to send classical communication. Therefore, the practical merit of our protocol is that it is applicable to situations in which the receiver has insufficient resource to meet the demand. © 2012 IOP Publishing Ltd.

Song J.,Harbin Institute of Technology | Xia Y.,Fuzhou University | Sun X.-D.,Harbin Institute of Technology | Song H.-S.,Dalian University of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We investigate the generation of a multibody Dicke state in a coupled cavity system subject to environmental noise. Based on quantum feedback control, cavity decay may play a constructive role in obtaining the intended state. The required interaction time need not be accurately controlled. In addition, the feedback operations are only applied to a single atom in one cavity during the whole evolution process, and it is not necessary to change the control strategy as the number of atoms increases. Thus, our proposal can exploit the core advantage of coupled cavities to implement a scalable control scheme for preparing multibody entanglement. © 2012 American Physical Society.

Yu C.,Jiangxi University of Science and Technology | Yu C.,Carnegie Mellon University | Li G.,Carnegie Mellon University | Kumar S.,Carnegie Mellon University | And 2 more authors.
Advanced Materials | Year: 2014

Coreshell-like Ag2O/Ag2CO3 nanoheterostructures with tailored interface are fabricated by a facile, low-cost and one-step phase transformation method. The unique bandgap structure of the Ag2O/Ag2CO3 exhibits high separation efficiency of photogenerated electrons and holes, which effectively protects the Ag2CO3 semiconductor to avoid its photoreduction and gives rise to high activity and stability in degradation of the typical water pollutants. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chen Y.-H.,Fuzhou University | Xia Y.,Fuzhou University | Chen Q.-Q.,Fuzhou University | Song J.,Harbin Institute of Technology
Laser Physics Letters | Year: 2014

In this letter, we study the fast and noise-resistant population transfer, quantum entangled states' preparation and quantum entangled states' transition by constructing shortcuts to adiabatic passage (STAP) for multiparticles based on the approach of 'Lewis-Riesenfeld invariants' in a distant cavity quantum electronic dynamics (QED) system. Numerical simulation demonstrates that all of the schemes are fast and robust against the decoherence caused by atomic spontaneous emission and photon leakage. Moreover, it is not only the total operation time but also the robustness in each scheme against decoherence that is irrelevant to the number of qubits. This might lead to a useful step toward realizing fast and noise-resistant quantum information processing in current technology. © 2014 Astro Ltd.

Wu J.,Fuzhou University | Deng X.,Fujian Southeast Standard Certification Center | Lin X.,Fuzhou University
Radiation Physics and Chemistry | Year: 2013

Graft copolymerization of konjac glucomannan (KGM) and acrylic acid was induced by 60Co-γ irradiation at room temperature. The effects of radiation dose and monomer-to-KGM ratio on grafting yield and equilibrium water absorbency were investigated. The KGM-based superabsorbent polymer (KSAP) could absorb water 625 times of its dry weight when the radiation dose was 5.0kGy and monomer-to-KGM ratio was 5. The structure of KSAP was characterized by FTIR, XRD, and SEM. KSAP showed a lower crystallinity than KGM. The porous microstructure of KSAP was revealed by SEM. The diffusion mechanism of water in the hydrogel is consistent with the anomalous diffusion model. Cations, especially multivalent cations, greatly reduced water absorbency of KSAP. Rising temperature, acidic or basic solutions are not favorable for the swelling of KSAP. © 2012 Elsevier Ltd.

Fan L.-L.,Fuzhou University | Xia Y.,Fuzhou University | Song J.,Harbin Institute of Technology
Quantum Information Processing | Year: 2014

We present an efficient protocol to concentrate arbitrary less-hyperentangled multi-photon W states to the maximally hyperentangled multi-photon W state with parameter-splitting method and linear optics elements. Compared with previous entanglement concentration works, the present protocol does not need two copies of partially entangled states or the ancillary single photon. Moreover, we discuss the feasibility of the setups of the protocol, concluding that the present protocol is feasible with the current technology. Thus, the protocol may be more meaningful in practical quantum information applications. © 2014 Springer Science+Business Media New York.

Yu C.,Jiangxi University of Science and Technology | Yang K.,Jiangxi University of Science and Technology | Yang K.,Fuzhou University | Xie Y.,Nanchang Hangkong University | And 4 more authors.
Nanoscale | Year: 2013

Noble metal/semiconductor nanocomposites play an important role in high efficient photocatalysis. Herein, we demonstrate a facile strategy for fabrication of hollow Pt-ZnO nanocomposite microspheres with hierarchical structure under mild solvothermal conditions using Zn (CH3COO) 2·2H2O and HPtCl4 as the precursors, and polyethylene glycol-6000 (PEG-6000) and ethylene glycol as the reducing agent and solvent, respectively. The as-synthesized ZnO and Pt-ZnO composite nanocrystals were well characterized by powder X-ray diffraction (XRD), nitrogen-physical adsorption, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS), and photoluminescence (PL) emission spectroscopy. It was found that Pt content greatly influences the morphology of Pt-ZnO composite nanocrystals. Suitable concentration of HPtCl4 in the reaction solution system can produce well hierarchically hollow Pt-ZnO nanocomposite microspheres, which are composed of an assembly of fine Pt-ZnO nanocrystals. Photocatalytic tests of the Pt-ZnO microspheres for the degradation of the dye acid orange II revealed extremely high photocatalytic activity and stability compared with those of pure ZnO and corresponding Pt deposited ZnO. The remarkable photocatalytic performance of hollow Pt-ZnO microspheres mainly originated from their unique nanostructures and the low recombination rate of the e-/h+ pairs by the platinum nanoparticles embedded in ZnO nanocrystals. © 2013 The Royal Society of Chemistry.

Liang Y.,Yanbian University | Su S.-L.,Harbin Institute of Technology | Wu Q.-C.,Fuzhou University | Ji X.,Yanbian University | And 2 more authors.
Optics Express | Year: 2015

We propose an adiabatic passage approach to generate two atoms three-dimensional entanglement with the help of quantum Zeno dynamics in a time-dependent interacting field. The atoms are trapped in two spatially separated cavities connected by a fiber, so that the individual addressing is needless. Because the scheme is based on the resonant interaction, the time required to generate entanglement is greatly shortened. Since the fields remain in vacuum state and all the atoms are in the ground states, the losses due to the excitation of photons and the spontaneous transition of atoms are suppressed efficiently compared with the dispersive protocols. Numerical simulation results show that the scheme is robust against the decoherences caused by the cavity decay and atomic spontaneous emission. Additionally, the scheme can be generalized to generate N-atom three-dimensional entanglement and high-dimensional entanglement for two spatially separated atoms. © 2015 Optical Society of America.

Xia Y.,Fuzhou University | Xia Y.,Dalian University of Technology | Chen Q.-Q.,Fuzhou University | Song J.,Harbin Institute of Technology | Song H.-S.,Dalian University of Technology
Journal of the Optical Society of America B: Optical Physics | Year: 2012

The entangled states analysis is a very important element for quantum information. It is impossible to unambiguously distinguish the three-photon Greenberger-Horne-Zeilinger (GHZ) states in polarization, resorting to linear optical elements only. Here, we propose an efficient scheme to complete three-photon hyperentangled GHZ states analysis (HGSA) with the help of the cross-Kerr nonlinearity. The three-photon HGSA scheme can also be generalized to N-photon hyperentangled GHZ states analysis. We discuss the application of the HGSA in the quantum secure direct communication (QSDC) with polarization and spatial-mode degrees of freedom. The results show that the HGSA not only increase the channel capacity but also ensure the unconditional security in long-distance quantum communication. © 2012 Optical Society of America.

Chen F.,Zhejiang University | Chen F.,Jimei University | Yu H.,Zhejiang University | Yu H.,State Key Laboratory of CAD and CG | And 2 more authors.
Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition | Year: 2013

In this paper we introduce a new shape-driven approach for object segmentation. Given a training set of shapes, we first use deep Boltzmann machine to learn the hierarchical architecture of shape priors. This learned hierarchical architecture is then used to model shape variations of global and local structures in an energetic form. Finally, it is applied to data-driven variational methods to perform object extraction of corrupted data based on shape probabilistic representation. Experiments demonstrate that our model can be applied to dataset of arbitrary prior shapes, and can cope with image noise and clutter, as well as partial occlusions. © 2013 IEEE.

Dong Y.,Nanyang Technological University | Pang H.,Nanyang Technological University | Yang H.B.,Nanyang Technological University | Guo C.,Nanyang Technological University | And 6 more authors.
Angewandte Chemie - International Edition | Year: 2013

Helpful elements: A facile bottom-up method using citric acid and L-cysteine as a precursor has been developed to prepare graphene quantum dots (GQDs) co-doped with nitrogen and sulfur. A new type and high density of surface state of GQDs arises, leading to high yields (more than 70 %) and excitation-independent emission. FLQY=fluorescence quantum yield. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fan L.-L.,Fuzhou University | Xia Y.,Fuzhou University | Song J.,Harbin Institute of Technology
Optics Communications | Year: 2014

We propose a feasible and efficient scheme to complete hyperentanglement- assisted multi-photon Greenberger-Horne-Zeilinger (GHZ) states analysis with the quantum nondemolition detectors (QNDs). Firstly, we unambiguously distinguish the two-photon Bell states and three-photon GHZ states in polarization degree of freedom (DOF) assisted with the frequency DOF. Then, we show that the scheme can be extended to the N-photon (N>3) GHZ states in polarization DOF analysis, and moreover, the entanglement in polarization DOF is not disturbed by our operations. All these advantages make this scheme more meaningful in quantum information processing. © 2014 Elsevier B.V.

Song J.,Harbin Institute of Technology | Sun X.-D.,Harbin Institute of Technology | Xia Y.,Fuzhou University | Song H.-S.,Dalian University of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011

We investigate the generation of continuous-variable (CV) entanglement of two separated atomic ensembles in coupled cavities. We find that under certain conditions, the entanglement between the two ensembles is gained periodically when the three-level Λ-type atoms in each ensemble dispersively interact with one classical field and one cavity mode. Generation of the entangled state does not completely depend on the cavity photon number. In addition, the effect of decoherence can be suppressed effectively. © 2011 American Physical Society.

Chen Y.-H.,Fuzhou University | Xia Y.,Fuzhou University | Chen Q.-Q.,Fuzhou University | Song J.,Harbin Institute of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

The Lewis-Riesenfeld phases which play a crucial role in constructing shortcuts to adiabaticity may be a resource for the implementation of quantum phase gates. By combining "Lewis-Riesenfeld invariants" with "quantum Zeno dynamics," we propose an effective scheme of rapidly implementing π phase gates via constructing shortcuts to adiabatic passage in a two-distant-atom-cavity system. The influence of various decoherence processes such as spontaneous emission and photon loss on the fidelity is discussed. It is noted that this scheme is insensitive to both error sources. Additionally, a creation of N-atom cluster states is put forward as a typical example of the applications of the fast and noise-resistant phase gates. The study results show that the shortcuts idea is not only applicable in other logic gates with different systems, but also propagable for many quantum information tasks. © 2015 American Physical Society.

Liang Y.,Yanbian University | Wu Q.-C.,Fuzhou University | Su S.-L.,Harbin Institute of Technology | Ji X.,Yanbian University | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

We propose an alternative scheme of shortcuts to a quantum controlled phase gate in a much shorter time based on the approach of Lewis-Riesenfeld invariants in cavity quantum electrodynamics systems. This scheme can be used to perform a one-qubit phase gate, a two-qubit controlled phase gate, as well as a multiqubit controlled phase gate. The strict numerical simulations demonstrate that the total operation time for implementing controlled phase gates is much shorter than previous schemes and very robust against decoherence. © 2015 American Physical Society.

Chen Y.-H.,Fuzhou University | Xia Y.,Fuzhou University | Chen Q.-Q.,Fuzhou University | Song J.,Harbin Institute of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014

Achieving fast population transfer (FPT) in multiparticle systems based on the cavity quantum electronic dynamics is an outstanding challenge. In this paper, motivated by the quantum Zeno dynamics, a shortcut for performing the FPT of ground states in multiparticle systems with the invariant-based inverse engineering is proposed. Numerical simulation demonstrates that a perfect population transfer of ground states in multiparticle systems can be rapidly achieved in one step, and the FPT is robust to both the cavity decay and atomic spontaneous emission. Additionally, this scheme is not only implemented without requiring extra complex conditions, but also insensitive to variations of the parameters. © 2014 American Physical Society.

Lu M.,Fuzhou University | Xia Y.,Fuzhou University | Shen L.-T.,Fuzhou University | Song J.,Harbin Institute of Technology | An N.B.,Vietnam Academy of Science and Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014

We use the approach of "transitionless quantum driving" proposed by Berry to construct shortcuts to the population transfer and the creation of maximal entanglement between two Λ-type atoms based on the cavity quantum electronic dynamics system. An effective Hamiltonian is designed by resorting to an auxiliary excited level, a classical driving field, and an extra cavity field mode to supplement or substitute the original reference Hamiltonian, and steer the system evolution along its instantaneous eigenstates in an arbitrarily short time, speeding up the rate of population transfer and creation of maximal entanglement between the two atoms inside a cavity. Numerical simulation demonstrates that our shortcuts are robust against the decoherences caused by atomic spontaneous emission and cavity photon leakage. © 2014 American Physical Society.

Li Z.,Shanghai Normal University | Li Z.,Fuzhou University | Han M.,Shanghai Normal University | Chen F.,Fuzhou University
Nonlinear Analysis: Real World Applications | Year: 2013

In this paper, we consider an autonomous Lotka-Volterra competitive system with infinite delays and feedback controls. The extinction and global stability of equilibriums are discussed using the Lyapunov functional method. If the Lotka-Volterra competitive system is globally stable, then we show that the feedback controls only change the position of the unique positive equilibrium and retain the stable property. If the Lotka-Volterra competitive system is extinct, by choosing the suitable values of feedback control variables, we can make extinct species become globally stable, or still keep the property of extinction. Some examples are presented to verify our main results. © 2012 Published by Elsevier Ltd.

Zhong S.,Fuzhou University | Zhong S.,University of Liverpool | Oyadiji S.O.,University of Manchester
Computers and Structures | Year: 2011

This paper proposes a new approach for damage detection in beam-like structures with small cracks, whose crack ratio [r = Hc/H] is less than 5%, without baseline modal parameters. The approach is based on the difference of the continuous wavelet transforms (CWTs) of two sets of mode shape data which correspond to the left half and the right half of the modal data of a cracked simply-supported beam. The mode shape data of a cracked beam are apparently smooth curves, but actually exhibit local peaks or discontinuities in the region of damage because they include additional response due to the cracks. The modal responses of the damaged simply-supported beams used are computed using the finite element method. The results demonstrate the efficiency of the proposed method for crack detection, and they provide a better crack indicator than the result of the CWT of the original mode shape data. The effects of crack location and sampling interval are examined. The simulated and experimental results show that the proposed method has great potential in crack detection of beam-like structures as it does not require the modal parameter of an uncracked beam as a baseline for crack detection. It can be recommended for real applications. © 2010 Elsevier Ltd. All rights reserved.

Chen Y.,Fuzhou University | Zhang L.,Fuzhou University | Cai Z.,Hong Kong Baptist University | Chen G.,Fuzhou University
Analyst | Year: 2011

In this paper, we developed a simple and effective on-line focusing technique combining dynamic pH junction and sweeping by capillary electrophoresis (CE) with laser-induced fluorescence (LIF) detection. Dynamic pH junction-sweeping is defined when the sample has a different buffer pH (dynamic pH junction condition) and is devoid of micelles (sweeping condition) relative to the background electrolyte (BGE). This hyphenated focusing mode was applied to the sensitive and selective focusing of four dipeptides: Tyr-Phe, Tyr-Leu, Trp-Gly, and Ala-Gln. Picomolar detectability of these dipeptides by CE-LIF detection was demonstrated through effective focusing of large sample volumes (up to 39% capillary length) using the dual pH junction-sweeping focusing mode. 25 mmol L-1 sodium dihydrogen phosphate, pH 2.5 was used as the sample matrix, and 100 mmol L-1 borate, 21 mmol L-1 sodium dodecylsulfate (SDS), 16 mmol L-1 Brij35, pH 9.0 as the background solution (BGS). The concentration detection limits (S/N = 3) of the four dipeptides were in the range of 1.0-5.0 pmol L-1. The developed method has been successfully used for the determination of dipeptides in human serum samples. © 2011 The Royal Society of Chemistry.

Lai Y.,Hong Kong Baptist University | Cai Z.,Hong Kong Baptist University | Cai Z.,Fuzhou University
Environmental Science and Pollution Research | Year: 2012

Purpose: Hydroxylated polybrominated diphenyl ethers (OH-PBDEs) have emerged as contaminants of environmental concerns because they pose potential risks to human and animal health. The purpose of this study was to investigate the in vitro metabolism of OH-PBDEs and their potential inhibition against 17β-estradiol (E2) metabolism. Methods: Rat liver microsomes were used as a source of P450 enzymes in an in vitro metabolism study of OH-PBDEs. Inhibition of E2 metabolism and kinetic study were performed by incubating with rat liver microsomes in the presence of OH-PBDEs. Results: The obtained data clearly demonstrated that OH-PBDEs, especially those congeners with lower bromination, could be metabolized to bromophenol and diOH-PBDEs. The less metabolic rate of OH-PBDEs was observed with the increasing number of bromine substituents. OH-PBDEs with hydroxyl group and bromine adjacent to the ether bridge showed faster metabolic rates. In addition, the results showed non-competitive inhibition of E2 metabolism by OH-PBDEs with IC50 values in the range from 13. 7 to 55. 2 μM. The most potent OH-PBDE inhibitor was found to be 3′-OH-BDE-100. The inhibitory potencies for OH-PBDEs were significantly higher than those of parent PBDE and methoxylated metabolites, providing the evidence that PBDEs exerted estrogenic activity in part by their hydroxylated metabolites. Conclusions: OH-PBDEs exhibited large differences in their capacity to be metabolized and to inhibit E2 metabolism in rat liver microsomes. The finding might increase our understanding of healthy risk associated with PBDEs in human and wildlife. © 2012 Springer-Verlag.

Zhao D.,Hong Kong Baptist University | Lu M.,Hong Kong Baptist University | Cai Z.,Fuzhou University
Electrophoresis | Year: 2012

An efficient and sensitive method for the separation and determination of three essential amino acids and three B vitamins by CE-LIF with a simultaneous derivatization procedure was developed. The conditions for derivatization and separation of these micronutrients were investigated. FITC was used as the reagent for fluorescence tagging of arginine (Arg), valine (Val), tryptophan (Trp), folic acid (FA), and niacinamide (NA). Riboflavin (RF) was detected without derivatization. Derivatization of analytes dissolved in borate solution was performed by successive introduction of fluorescence reagent and analytes followed by water bathing at 43°C. The molar ratio of sample/reagent (S/R), derivatization temperature, and incubation time significantly influenced the efficiency of derivatization. To maximize the fluorescence yield, a high S/R (≥20) was required. The nonderivatized RF and five derivatized analytes were separated in the optimized CE-LIF system with the application of 22 kV voltage and 25 mM borate buffer at pH 9.85. Validation of the method showed good linearity for the corrected peak areas versus standard concentrations for the six analytes. The RSDs (n = 3) of the migration time and the peak area obtained for the analytes ranged from 0.4 to 1.1% and from 1.9 to 4.4%, respectively. The developed method, with the lowest LOD of 0.5 nM, was successfully applied for the efficient derivatization and determination of B vitamins in four health drink samples. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Lin Z.-A.,Fuzhou University | Zheng J.-N.,Fuzhou University | Lin F.,Fuzhou University | Zhang L.,Fuzhou University | And 2 more authors.
Journal of Materials Chemistry | Year: 2011

Aminophenylboronic acid (APBA)-functionalized magnetic iron oxide nanoparticles (Fe3O4 MNPs) were synthesized for the selective capture of glycoproteins from unfractionated protein mixtures. The morphology, adsorption, and recognition properties of the resultant particles were investigated and uniform size APBA-coated MNPs with a mean diameter of ∼15 nm and high magnetic saturation value of 30.6 emu g-1 were obtained, which endued the adsorbent with a large surface area and convenience of isolation. The selectivity and binding capacity of APBA-coated MNPs were evaluated by using standard glycoproteins (cellulose and ovalbumin) and nonglycoproteins (bovine hemoglobin, bovine serum albumin and lysozyme) as model samples. Adsorption experiments and SDS-PAGE demonstrated that the APBA-coated MNPs had higher binding capacity and selectivity for glycoproteins compared to nonglycoproteins. In addition, the practicability of the as-prepared MNPs was further assessed by specific capture of ovalbumin from an egg white sample. © 2011 The Royal Society of Chemistry.

Zhou X.,Zhejiang University of Technology | Li Y.,City University of Hong Kong | He B.,Fuzhou University | Bai T.,Pacific Advanced Technology
IEEE Transactions on Industrial Informatics | Year: 2014

Tracking multiple moving targets in a video is a challenge because of several factors, including noisy video data, varying number of targets, and mutual occlusion problems. The Gaussian mixture probability hypothesis density (GM-PHD) filter, which aims to recursively propagate the intensity associated with the multi-target posterior density, can overcome the difficulty caused by the data association. This paper develops a multi-target visual tracking system that combines the GM-PHD filter with object detection. First, a new birth intensity estimation algorithm based on entropy distribution and coverage rate is proposed to automatically and accurately track the newborn targets in a noisy video. Then, a robust game-theoretical mutual occlusion handling algorithm with an improved spatial color appearance model is proposed to effectively track the targets in mutual occlusion. The spatial color appearance model is improved by incorporating interferences of other targets within the occlusion region. Finally, the experiments conducted on publicly available videos demonstrate the good performance of the proposed visual tracking system. © 2012 IEEE.

Lin Z.,Hong Kong Baptist University | Lin Z.,Fuzhou University | Bian W.,Hong Kong Baptist University | Zheng J.,Fuzhou University | Cai Z.,Hong Kong Baptist University
Chemical Communications | Year: 2015

Zeolitic imidazolate framework-8 coated magnetic nanocomposites (Fe3O4@ZIF-8 MNCs) served as an absorbent and a matrix for negative-ion MALDI-TOF MS. The host-guest property and interference-free background made them an ideal dual platform for the sensitive analysis of small molecules. © 2015 The Royal Society of Chemistry.

Lin Z.,Fuzhou University | Pang J.,Fuzhou University | Yang H.,Fuzhou University | Cai Z.,Hong Kong Baptist University | And 2 more authors.
Chemical Communications | Year: 2011

An inorganic-organic hybrid affinity monolithic column was synthesized by a novel "one-pot" approach. The resulting hybrid affinity monoliths have potential applications in specific recognition and enrichment of glycoproteins. © The Royal Society of Chemistry 2011.

Lu M.,Hong Kong Baptist University | Lai Y.,Hong Kong Baptist University | Chen G.,Fuzhou University | Cai Z.,Hong Kong Baptist University
Chemical Communications | Year: 2011

A novel method for the characterization of polymers by laser desorption/ionization on the layer of graphene nanoparticles coupled with time-of-flight mass spectrometry was demonstrated. Various polymers including polypropylene glycol, polystyrene and polymethyl methacrylate with average molecular weights from 425 to 3500 Da were analyzed. © 2011 The Royal Society of Chemistry.

Lu M.,Hong Kong Baptist University | Lai Y.,Hong Kong Baptist University | Chen G.,Fuzhou University | Cai Z.,Hong Kong Baptist University
Analytical Chemistry | Year: 2011

This work presents a new approach for the analysis of small molecules with direct negative ion laser desorption/ionization (LDI) on graphene flakes. A series of matrix interference-free mass spectra were obtained for the analysis of a wide range of small molecules including peptides, amino acids, fatty acids, as well as nucleosides and nucleotides. The mixture of analytes and graphene flakes suspension were directly pipetted onto a sample plate for LDI-time-of-flight mass spectrometry (TOFMS) analysis. Deprotonated monomeric species [M-H]- ions were homogeneously obtained on uniform graphene flakes film when negative ion mode was applied. In positive ion mode, the analytes were detected in form of multiple adduct ions such as sodium adduct [M+Na]+, potassium adduct [M+K]+, double sodium adduct [M+2Na-H]+, double potassium adduct [M+2K-H]+, as well as sodium and potassium mixed adduct [M+Na+K-H]+. Better sensitivity and reproducibility were achieved in negative ion mode compared to positive ion mode. It is believed that the new method of matrix interference-free negative ion LDI on graphene flakes may be expanded for LDI-MS analysis of various small molecules. © 2011 American Chemical Society.

Xu X.L.,Nanchang University | Li J.Q.,Fuzhou University
Surface Science | Year: 2011

Adsorption of H2O and its effect on CO oxidation over spinel Co3O4 (110) surface were studied by density functional theory calculations. H2O is adsorbed favorably at the octahedral cobalt (Cooct) site through O atom on the surface. Hydrogen bonding interaction between 1s orbitals of H atoms in H2O and the 2p orbitals of surface active oxygen sites plays a key role for H2O adsorption. The inhibition effect of H2O adsorption on the CO oxidation over the surfaces is attributed to the competition between H2O and CO molecules for the surface twofold coordinated oxygen site. © 2011 Elsevier B.V. All rights reserved.

Chai B.,Wuhan University | Peng T.,Wuhan University | Peng T.,Fuzhou University | Zeng P.,Wuhan University | And 2 more authors.
Journal of Physical Chemistry C | Year: 2011

A series of ZnIn2S4 floriated microspheres consisting of flakes were synthesized by a facile template-free hydrothermal method. The obtained ZnIn2S4 products were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, UV-vis diffuse reflectance absorption spectroscopy, and nitrogen adsorption measurement. The effects of hydrothermal temperature and pH value on the crystal structures, morphologies, and optical properties of ZnIn2S4 microspheres were investigated. The photocatalytic activities for hydrogen production of the as-prepared samples were evaluated under visible-light (λ≥ 420 nm) irradiation. It was found that the 1.0 wt % Pt-loaded ZnIn2S 4 prepared hydrothermally at 160 °C with pH = 1.00 showed a higher and steady photoactivity for H2 evolution from aqueous solutions containing sacrificial reagents SO3 2- and S 2- than the products prepared at other hydrothermal temperatures. Moreover, an apparent quantum efficiency of up to 34.3% was achieved under incident monochromatic light of 420 nm, significantly higher than previously reported values. © 2011 American Chemical Society.

Lin Z.,Fuzhou University | Zhang G.,Fuzhou University | Yang W.,Fuzhou University | Yang W.,Zhangzhou Product Quality Inspection Institute | And 2 more authors.
Chemical Communications | Year: 2012

Polymer dots were employed as luminophors to design a fluorescence biosensor for carcinoembryonic antigen (CEA) with high sensitivity and selectivity; the increased fluorescence intensity is proportional to CEA concentration in the range of 0.1-10 ng mL-1. © The Royal Society of Chemistry 2012.

Lam K.-T.,Fuzhou University | Chang S.-J.,National Cheng Kung University
IEEE/OSA Journal of Display Technology | Year: 2014

The authors report the study of 'thermal droop' for GaN-based light-emitting diodes (LEDs) using a single AlGaN layer with various thicknesses as the electron blocking layer (EBL). It was found that the effect of bandgap narrowing at elevated temperatures on the drop of LED output power should be negligibly smaller. It was also found that the inserted EBL could significantly reduce 'thermal droop' due to the effective suppression of electron overflow at elevated temperatures. Furthermore, it was found that we could drastically reduce the output power decrease by about 42% with a properly designed EBL. © 2014 IEEE.

Guo W.,Hebrew University of Jerusalem | Lu C.-H.,Hebrew University of Jerusalem | Orbach R.,Hebrew University of Jerusalem | Wang F.,Hebrew University of Jerusalem | And 5 more authors.
Advanced Materials | Year: 2015

(Figure Presented) Nucleic acid-functionalized polyacrylamide chains that are cooperatively cross-linked by i-motif and nucleic acid duplex units yield, at pH 5.0, DNA hydrogels exhibiting shape-memory properties. Separation of the i-motif units at pH 8.0 dissolves the hydrogel into a quasi-liquid phase. The residual duplex units provide, however, a memory code in the quasi-liquid allowing the regeneration of the hydrogel shape at pH 5.0. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA.

Yang W.,Fuzhou University | Zhu X.,Fuzhou University | Liu Q.,Xi'an Jiaotong University | Lin Z.,Fuzhou University | And 2 more authors.
Chemical Communications | Year: 2011

A simple assay based on electrochemical impedance spectroscopy (EIS) for detection of telomerase activity is developed, and it is demonstrated that the label-free EIS method is capable of detecting the telomerase activity in HeLa cells with a detection limit of 1000 HeLa cells without using any amplification technique. © 2011 The Royal Society of Chemistry.

Lv H.,Wuhan University | Ma L.,Wuhan University | Zeng P.,Wuhan University | Ke D.,Wuhan University | And 2 more authors.
Journal of Materials Chemistry | Year: 2010

Floriated ZnFe2O4 with porous nanorod structures were successfully synthesized via mild hydrothermal and calcination processes by using cetyltrimethylammonium bromide (CTABr) as a template-directing reagent. The resulting ZnFe2O4 was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS) and nitrogen adsorption measurement. It was found that the floriated ZnFe2O4 nanostructures were composed of porous nanorods with an average length of 122 nm and diameter of 29 nm. The obtained ZnFe2O4 with a bandgap of ∼1.94 eV was firstly used as a visible-light-driven photocatalyst for hydrogen production, and exhibits remarkable photostability in an aqueous suspension by using CH 3OH as a sacrificial reagent. Moreover, the possible photo-reaction mechanism for the hydrogen production from CH3OH aqueous solution was proposed for better understanding the photocatalytic behavior of ZnFe 2O4 without Pt-loading. © 2010 The Royal Society of Chemistry.

Zhu X.,Fuzhou University | Gao X.,Fuzhou University | Liu Q.,Xi'an Jiaotong University | Lin Z.,Fuzhou University | And 2 more authors.
Chemical Communications | Year: 2011

A novel nucleic acid hairpin structure composed of Pb2+- dependent DNAzyme and HRP-mimicking DNAzyme was developed. This hairpin structure can be used as a sensor for the detection of Pb2+ based on colorimetry. © 2011 The Royal Society of Chemistry.

Wu B.,Fuzhou University | Zhang L.,Wuhan University | Zhao Y.,China University of Mining and Technology
IEEE Transactions on Geoscience and Remote Sensing | Year: 2014

A feature selection method based on Cramer's V-test (CV-test) discretization is presented to improve the classification accuracy of remotely sensed imagery. Three possible contributions are pursued in this paper. First of all, a Cramer's V-based discretization (CVD) algorithm is proposed to optimally partition the continuous features into discrete ones. Two association-based feature selection indexes, the CVD-based association index (CVDAI) and the class-attribution interdependence maximization (CAIM)-based association index (CAIMAI), derived from the CV-test value, are then proposed to select the optimal feature subset. Finally, the benefit of using discretized features to improve the performance with the J48 decision tree (J48-DT) and naive Bayes (NB) classifiers is studied. To validate the proposed approaches, a high spatial resolution image and two hyperspectral data sets were used to evaluate the performances of CVD and the associated algorithms. The test performances of discretization using CVD and two other state-of-the-art methods, the CAIM and equal width, show that the CVD-based technique has the better ability to generate a good discretization scheme. Furthermore, the feature selection indexes, CVDAI and CAIMAI, perform better than the other used feature selection methods in terms of overall accuracies achieved by the J48-DT, NB, and support vector machine classifiers. Our tests also show that the use of discretized features benefits the J48-DT and NB classifiers. © 1980-2012 IEEE.

Lu C.-H.,Hebrew University of Jerusalem | Qi X.-J.,Hebrew University of Jerusalem | Qi X.-J.,Fuzhou University | Orbach R.,Hebrew University of Jerusalem | And 4 more authors.
Nano Letters | Year: 2013

Copolymer chains consisting of acrylamide units and guanine (G)-containing oligonucleotide-tethered acrylamide units undergo, in the presence of K + ions, cross-linking by G-quadruplexes to yield a hydrogel. The hydrogel is dissociated upon addition of 18-crown-6 ether that traps the K + ions. Reversible formation and dissociation of the hydrogel is demonstrated by the cyclic addition of K+ ions and 18-crown-6 ether, respectively. Formation of the hydrogel in the presence of hemin results in a hemin/G-quadruplex-cross-linked catalytic hydrogel mimicking the function of horseradish peroxidase, reflected by the catalyzed oxidation of 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulfonic acid), ABTS2-, by H2O2 to ABTS.- and by the catalyzed generation of chemiluminescence in the presence of luminol/H2O 2. Cyclic "ON" and "OFF" activation of the catalytic functions of the hydrogel are demonstrated upon the formation of the hydrogel in the presence of K+ ions and its dissociation by 18-crown-6 ether, respectively. The hydrogel is characterized by rheology measurements, circular dichroism, and probing its chemical and photophysical properties. © 2013 American Chemical Society.

Qi X.-J.,Fuzhou University | Qi X.-J.,Hebrew University of Jerusalem | Lu C.-H.,Hebrew University of Jerusalem | Liu X.,Hebrew University of Jerusalem | And 3 more authors.
Nano Letters | Year: 2013

An oscillatory pH system is implemented to drive oscillatory pH-switchable DNA machines and to control pH-stimulated electron transfer at electrode surfaces. The oscillatory pH system drives the autonomous opening and closure of DNA tweezers and activates a DNA pendulum by the pH-stimulated formation and dissociation of i-motif structures. Also, a sequence-programmed nucleic acid monolayer-functionalized electrode undergoes autonomous oscillatory pH transitions between random coil and i-motif configurations, leading to the control of electron transfer at electrode surfaces. © 2013 American Chemical Society.

Feng M.,Fuzhou University | Sun R.,Fuzhou University | Zhan H.,Fuzhou University | Chen Y.,East China University of Science and Technology
Nanotechnology | Year: 2010

The implantation and growth of metal nanoparticles on graphene nanosheets (GNS) leads directly to severe damage to the regular structure of the graphene sheets, which disrupts the extended π conjugation, resulting in an impaired device performance. In this paper, we describe a facile approach for achieving the lossless formation of graphene composite decorated with tiny cadmium sulfide quantum dots (QDs) with excellent nonlinear optical properties by using benzyl mercaptan (BM) as the interlinker. The mercapto substituent of BM binds to the CdS QDs during their nucleation and growth process, and then the phenyl comes into contact with the GNS via the π-π stacking interaction. Using this strategy, CdS QDs with an average diameter of 3nm are uniformly dispersed over the surface of graphene, and the resulting QD-graphene composite exhibits excellent optical limiting properties, mainly contributed by nonlinear scattering and nonlinear absorption, upon both 532 and 1064nm excitations, in the nanosecond laser pulse regime. © 2010 IOP Publishing Ltd.

Gu Q.,Fuzhou University | Long J.,Fuzhou University | Zhuang H.,Fuzhou University | Zhang C.,Fuzhou University | And 2 more authors.
Physical Chemistry Chemical Physics | Year: 2014

A variety of ternary nanoheterostructures composed of Pt nanoparticles (NPs), SnOx species, and anatase TiO2 are designed elaborately to explore the effect of interfacial electron transfer on photocatalytic H2 evolution from a biofuel-water solution. Among numerous factors controlling the H2 evolution, the significance of Pt sites for the H2 evolution is highlighted by tuning the loading procedure of Pt NPs and SnOx species over TiO2. A synergistic enhancement of H2 evolution can be achieved over the Pt/SnOx/TiO2 heterostructures formed by anchoring Pt NPs at atomically-isolated Sn-oxo sites, whereas the Pt/TiO2/SnO x counterparts prepared by grafting single-site Sn-oxo species on Pt/TiO2 show a marked decrease in the rate of H2 evolution. The characterization results clearly reveal that the synergy of Pt NPs and SnOx species originates from the vectorial electron transfer of TiO2 → SnOx → Pt occurring on the former, while the latter results from the competitive electron transfer from TiO 2 to SnOx and to Pt NPs. © 2014 the Partner Organisations.

Chen Y.-F.,Fuzhou University | Ma Y.-C.,Fuzhou University | Chen S.-M.,Fuzhou University
Crystal Growth and Design | Year: 2013

Presented here is a chiral three-dimensional indium(III)-organic compound [In(5-Aip)2]·(TPP)·4H2O (1; 5-Aip = 5-aminoisophthalate, TPP = tetraphenylphosphonium). The structure of 1 features an unusual tetrahedral anionic framework containing tetrahedral TPP guests. This compound shows interesting photoluminescent properties and notable catalytic activity on the diethylzinc addition to benzaldehyde. The results reveal that the employment of tetrahedral TPP cations as guests can not only direct the formation of a tetrahedral framework but also help on the improvement of physical properties. © 2013 American Chemical Society.

Lu C.-H.,Fuzhou University | Wang S.-L.,Fuzhou University | Ye S.-L.,Fuzhou University | Chen G.-N.,Fuzhou University | Yang H.-H.,Fuzhou University
NPG Asia Materials | Year: 2012

In this study, a novel method for the fast, sensitive and selective detection of Cu2+using gold nanoparticles (AuNPs) was developed and used in immunoassays. In the presence of L-cysteine, L-cysteine can bind to the surface of citrate-stabilized AuNPs through Au-S bonds. As a result, aggregation of AuNPs occurs through electrostatic interactions between the cysteinebound AuNPs. In contrast, in the presence of Cu2+, Cu2+ can catalyze O2 oxidation of cysteine, leading to the quick formation of disulfide cystine. An increase in the concentration of Cu2+ decreased L-cysteine-induced AuNPs aggregation by decreasing the number of free cysteine thiol groups, and the solution color changed from purple to red. Therefore, the concentration of Cu2+ can be detected with the naked eye or with ultraviolet visible spectroscopy, and the detection limits of Cu2+ were 20 nM and 10 nM, respectively. This sensitivity was approximately three orders of magnitude higher than that of traditional AuNPs-based colorimetric Cu2+ detection methods. Because of the high sensitivity of the proposed method, we further used it with a labeled antibody in colorimetric immunoassays. The detection limit of the cancer biomarker α-fetoprotein was 2 ngml1, which is comparable to the detection limit of the enzyme-linked immunosorbent assay method. © 2012 Nature Japan K.K. All rights reserved.

Pan X.,Fuzhou University | Yang M.-Q.,Fuzhou University | Xu Y.-J.,Fuzhou University
Physical Chemistry Chemical Physics | Year: 2014

Zinc oxide (ZnO) nanostructured materials have received significant attention because of their unique physicochemical and electronic properties. In particular, the functional properties of ZnO are strongly dependent on its morphology and defect structure, particularly for a semiconductor ZnO-based photocatalyst. Here, we demonstrate a simple strategy for simultaneous morphology control, defect engineering and photoactivity tuning of semiconductor ZnO by utilizing the unique surfactant properties of graphene oxide (GO) in a liquid phase. By varying the amount of GO added during the synthesis process, the morphology of ZnO gradually evolves from a one dimensional prismatic rod to a hexagonal tube-like architecture while GO is converted into reduced GO (RGO). In addition, the introduction of GO can create oxygen vacancies in the lattice of ZnO crystals. As a result, the absorption edge of the wide band gap semiconductor ZnO is effectively extended to the visible light region, which thus endows the RGO-ZnO nanocomposites with visible light photoactivity; in contrast, the bare ZnO nanorod is only UV light photoactive. The synergistic integration of the unique morphology and the presence of oxygen vacancies imparts the RGO-ZnO nanocomposite with remarkably enhanced visible light photoactivity as compared to bare ZnO and its counterpart featuring different structural morphologies and the absence of oxygen vacancies. Our promising results highlight the versatility of the 2D GO as a solution-processable macromolecular surfactant to fabricate RGO-semiconductor nanocomposites with tunable morphology, defect structure and photocatalytic performance in a system-materials-engineering way. © 2014 the Owner Societies.

Yu C.,CAS Fujian Institute of Research on the Structure of Matter | Li G.,CAS Fujian Institute of Research on the Structure of Matter | Guan X.,CAS Fujian Institute of Research on the Structure of Matter | Zheng J.,CAS Fujian Institute of Research on the Structure of Matter | And 2 more authors.
Electrochimica Acta | Year: 2012

This work reports on the optimized preparation of a series of composites xLi 2MnO 3·(1 - x)LiMn 1/3Ni 1/3Co 1/3O 2 (x = 0.1-0.4) with an aim to find an advanced high-voltage cathode for lithium-ion batteries that can work at elevated temperatures. Developing a two-step molten-salt method leads to composites with a layered-type structure, showing a particle size distribution ranging from 350 to 450 nm. The composites are featured by oxidation states stabilized as Mn 4+, Ni 2+, and Co 3+, and by lattice occupation of Li + in both transition-metal layers and lithium layer of LiMn 1/3Ni 1/3Co 1/3O 2. When acting as a cathode of lithium-ion batteries, the composite at x = 0.3 shows an optimum electrochemical performance as characterized by a discharge capacity of 120 mAh g -1 at a high current density of 500 mA g -1 and a capacity retention of 64% after 20 cycles. Surprisingly, this electrochemical performance is significantly improved at elevated temperatures. Namely, discharge capacity is increased to 140.4 mAh g -1 at a high current density of 500 mA g -1, while average capacity decay rate becomes very small to 0.76%. These excellent performance is explained in terms of the dramatically improved lithium-ion diffusions in both electrode and surface films at elevated temperatures. © 2012 Elsevier Ltd. All rights reserved.

Wang Y.-M.,Fuzhou University | Chin K.-S.,City University of Hong Kong
Information Sciences | Year: 2011

Eigenvector method (EM) is a well-known approach to deriving priorities from pairwise comparison matrices in the analytic hierarchy process (AHP), which requires the solution of a set of nonlinear eigenvalue equations. This paper proposes an approximate solution approach to the EM to facilitate its computation. We refer to the approach as a linear programming approximation to the EM, or LPAEM for short. As the name implies, the LPAEM simplifies the nonlinear eigenvalue equations as a linear programming for solution. It produces true weights for perfectly consistent pairwise comparison matrices. Numerical examples are examined to show the validity and effectiveness of the proposed LPAEM and its significant advantages over a recently developed linear programming method entitled LP-GW-AHP in rank preservation. © 2011 Elsevier Inc. All rights reserved.

Yu J.,Fuzhou University
Computer Standards and Interfaces | Year: 2015

Big Data Era brings global digital infrastructure collaboration built on the emerging standards. Given the complexity and dynamics of each specification, corresponding implementations need to undergo sufficient verification and validation procedures. Significant efforts have been invested into conformance testing of individual requirements, for example, by using formal, semi-formal or informal approaches. Less works have been accomplished, however, on the overall orchestration assessment so as to ensure global validity of conformance statements. For example, cyclic dependencies among conformance statements of a service under test may lead to inappropriate conclusions on the assessment outcome. In this study, a dependency model based on three-valued logic and fixed point theory to address dependency issues among cross-referenced statements is presented, so as to provide effective support to global digital infrastructure collaboration. © 2015 Elsevier B.V. All rights reserved.

Fang S.-E.,Fuzhou University | Perera R.,Technical University of Madrid
Mechanical Systems and Signal Processing | Year: 2011

Statistical tools, as well as mathematical ones, have been widely adopted and their performance has been shown in different engineering problems where randomicity usually exists. In the realm of engineering, merging statistical analysis into structural evaluation and assessment will be a tendency in the future. As a combination of mathematical and statistical techniques, response surface methodology has been successfully applied to design optimization, response prediction and model validation. This methodology provides explicit functions to represent the relationships between the inputs and outputs of a physical system, which is also a desirable advantage in damage identification. However, so far little research has been carried out in applying the response surface methodology to structural damage identification. This paper presents a damage identification method achieved by response surface based model updating using D-optimal designs. Compared with some common designs constructing response surfaces, D-optimal designs generally require a minimum number of numerical samples and this merit is quite desirable when analysts cannot obtain enough samples. In this study, firstly D-optimal designs are used to establish response surface models for screening out non-significant updating parameters and then first-order response surface models are constructed to substitute for finite element models in predicting the dynamic responses of an intact or damaged physical system. Three case studies of a numerical beam, a tested reinforced concrete frame and a tested full-scale bridge have been used to verify the proposed method. Physical properties such as Young's modulus and section inertias were chosen as the input features and modal frequency was the only response feature. It has been observed that the proposed method gives enough accuracy in damage prediction of not only the numerical but also the real-world structures with single and multiple damage scenarios, and the first-order response surface models based on the D-optimal criterion are adequate for such damage identification purposes. © 2010 Elsevier Ltd.All rights reserved.

Zheng H.-D.,Fuzhou University
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2016

A solution method for modifying thermoplastic polyurethane (TPU) by the introduction of 3D functionalized nanohybrids composed of two-dimensional GONRs and one-dimensional CNTs was applied. FTIR, XRD, XPS and TEM were employed to characterize the structure and properties of GONRs-CNTs hybrids before and after modification. The functionalized GONRs-CNTs (pGONRs-CNTs)/TPU composite films were subsequently prepared by solution coating method on a coating machine. Furthermore, by means of oxygen transmission rate test, tensile test and the observation of surface morphology, the synergetic effect between GONRs and CNTs and the effect of different pGONRs-CNTs content on the barrier and tensile properties of TPU composite films were also studied. The results show that a unique three-dimensional (3D) crosslinked nanostructure is successfully obtained, in which GONRs are bridged by CNTs. We also find that the as-prepared pGONRs-CNTs with neat shape and low defect are evenly dispersed in TPU matrix and form strong interfacial adhesion with the matrix, while the existing of CNTs play the role of supporting frame to prevent GONRs from sliding and aggregation; modified by phenyl isocyanate, the lipophilicity of pGONRs-CNTs composite is obviously improved, while, by the introduction of huge isocyanate, the interlayer spacing is further improved, which is good for uniform dispersion in the polymer matrix. As a result, when the mass fraction of pGONRs-CNTs is 0.5%, the barrier and tensile properties of pGONRs-CNTs/TPU composite films reach to the optimal values: the oxygen transmission rate decreases by 63.08% and the tensile strength increases by 46.55%, compared with those of the neat TPU, which will lead to great benefit for the barrier and mechanical properties of TPU films. © 2016, Journal of Materials Engineering. All right reserved.

Huang X.B.,Fuzhou University
Applied Mechanics and Materials | Year: 2014

Scheduling jobs on batch machines has a significant impact on the performance indicators utilization. We used ant colony algorithms to improve performance of the scheduling jobs on batch machines in the semiconductor fabrication with multi-priority orders. To minimize total tardiness penalty, the improved ant colony algorithms was used to perform batches forming and batches sorting respectively, which are the two sub-problem of batch machines’ scheduling. The simulation results show that the scheduling performance by our proposed algorithm is better than the heuristic rules, and the more percentage of emergency orders, the better it is. © (2014) Trans Tech Publications, Switzerland.

Huang C.-H.,Fuzhou University
Communications in Computer and Information Science | Year: 2012

Reconciliation is one of the most important technology in continuous variables quantum key distribution. In this paper, we implement multidimensional reconciliation, which can realize reconciliation without quantizing continuous variables, that greatly reduces the computational complexity of continuous variable reconciliation. Applying a linear group code of LDPC, the encoding and decoding was simple and has the performance of near to shannon's limit. LDPC is used in multidimensional reconciliation algorithm for correction. The results show that the key error rate approaches zero when noise-signal ratio comes to 5.2dB. © Springer-Verlag Berlin Heidelberg 2012.

Huang C.,Fuzhou University | Chen C.,Fuzhou University | Zhang M.,Fuzhou University | Lin L.,Fuzhou University | And 4 more authors.
Nature Communications | Year: 2015

The generation of sustainable and stable semiconductors for solar energy conversion by photoredox catalysis, for example, light-induced water splitting and carbon dioxide reduction, is a key challenge of modern materials chemistry. Here we present a simple synthesis of a ternary semiconductor, boron carbon nitride, and show that it can catalyse hydrogen or oxygen evolution from water as well as carbon dioxide reduction under visible light illumination. The ternary B-C-N alloy features a delocalized two-dimensional electron system with sp 2 carbon incorporated in the h-BN lattice where the bandgap can be adjusted by the amount of incorporated carbon to produce unique functions. Such sustainable photocatalysts made of lightweight elements facilitate the innovative construction of photoredox cascades to utilize solar energy for chemical conversion. © 2015 Macmillan Publishers Limited. All rights reserved.

Zhuang G.M.,Fuzhou University
Applied Mechanics and Materials | Year: 2014

Based on the optimization emergency management legal mechanism of environment emergency, we introduce the Apriori law to the emergencies analysis, and use support degree and confidence degree to improve the Apriori law, so the law has stronger relevance. We use the VC software to programming mathematical model of the law, and use VC source code and engineering design model to design the computer optimization system of environmental emergency management legal mechanism. In order to verify the effectiveness and reliability of the system, we do correlation calculation on legal mechanism before and after optimization, and obtain the correlation visualization process curve of Apriori law, and obtain the optimum structure of environmental emergencies legal mechanism. It provides a new computer method for studying environmental emergency management. © (2014) Trans Tech Publications, Switzerland.

Xiao F.-X.,Nanyang Technological University | Pagliaro M.,CNR Institute of Nanostructured Materials | Xu Y.-J.,Fuzhou University | Liu B.,Nanyang Technological University
Chemical Society Reviews | Year: 2016

Over the past few decades, layer-by-layer (LbL) assembly of multilayer thin films has garnered considerable interest on account of its ability to modulate nanometer control over film thickness and its extensive choice of usable materials for coating planar and particulate substrates, thus allowing for the fabrication of responsive and functional thin films for their potential applications in a myriad of fields. Herein, we provide elaborate information on the current developments of LbL assembly techniques including different properties, molecular interactions, and assembly methods associated with this promising bottom-up strategy. In particular, we highlight the principle for rational design and fabrication of a large variety of multilayer thin film systems including multi-dimensional capsules or spatially hierarchical nanostructures based on the LbL assembly technique. Moreover, we discuss how to judiciously choose the building block pairs when exerting the LbL assembly buildup which enables the engineering of multilayer thin films with tailor-made physicochemical properties. Furthermore, versatile applications of the diverse LbL-assembled nanomaterials are itemized and elucidated in light of specific technological fields. Finally, we provide a brief perspective and potential future challenges of the LbL assembly technology. It is anticipated that our current review could provide a wealth of guided information on the LbL assembly technique and furnish firm grounds for rational design of LbL assembled multilayer assemblies toward tangible applications. © 2016 The Royal Society of Chemistry.

Liu B.,Fuzhou University | Zhang B.,Fuzhou University | Chen G.,Fuzhou University | Tang D.,Fuzhou University
Microchimica Acta | Year: 2014

We report on a protocol for a simultaneous competitive immunoassay for tetracycline (TC) and chloramphenicol (CAP) on the same sensing interface. Conjugates of TC and of CAP with bovine serum albumin were first co-immobilized on a glassy carbon electrode modified with gold nanoparticles. In parallel, monoclonal anti-TC and anti-CAP antibodies were conjugated onto CdS and PbS nanoclusters, respectively. In a typical assay, the immobilized haptens and the added target analytes competed for binding to the corresponding antibodies on the nanoclusters. Subsequently, Cd(II) and Pb(II) ions are released from the surface of the corresponding nanoclusters by treatment with acid and then were detected by square wave anodic stripping voltammetry. The currents at the peak potentials for Cd(II) and Pb(II) were used as the sensor signal for TC and CAP, respectively. This multiplex immunoassay enables the simultaneous determination of TC and CAP in a single run with dynamic ranges from 0.01 to 50 ng mL-1 for both analytes. The detection limits for TC and for CAP are 7.5 pg mL-1 and 5.4 pg mL-1, respectively. No obvious nonspecific adsorption and cross-reactivity was observed in a series of analyses. Intra-assay and inter-assay coefficients of variation were less than 10 %. The method was evaluated by analyzing TC and CAP in spiked samples of milk and honey. The recoveries range from 88 % to 107 % for TC, and from 91 % to 119 % for CAP. [Figure not available: see fulltext.] © 2013 Springer-Verlag Wien.

Ma J.,Fuzhou University
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

25 solutions of chlorobenzene in CCl4 with different concentrations are studied by using laser Raman spectroscopy technique. The results show the linear relationship between the Raman spectral intensity ratio of chlorobenzene and CCl4 and the concentration of chlorobenzene in 253~0.44 g/L range. The linear correlation coefficient obtained by the least square method is 0.995. Laser Raman spectroscopy technique has the advantages of rapid, nondestructive detection and no need of sample pretreatment. It is proved that this spectral measurement method is feasible for low-concentration detection and quantitative analysis of organic molecules.

Guo L.,Fuzhou University
Journal of Combinatorial Optimization | Year: 2015

Let (Formula presented.) be a given directed graph in which every edge e is associated with two nonnegative costs: a weight w(e) and a length l(e). For a pair of specified distinct vertices (Formula presented.), the k-(edge) disjoint constrained shortest path (kCSP) problem is to compute k (edge) disjoint paths between s and t, such that the total length of the paths is minimized and the weight is bounded by a given weight budget (Formula presented.). The problem is known to be (Formula presented.)-hard, even when (Formula presented.) (Garey and Johnson in Computers and intractability, 1979). Approximation algorithms with bifactor ratio (Formula presented.) and (Formula presented.) have been developed for (Formula presented.) in Orda and Sprintson (IEEE INFOCOM, pp. 727–738, 2004) and Chao and Hong (IEICE Trans Inf Syst 90(2):465–472, 2007), respectively. For general k, an approximation algorithm with ratio (Formula presented.) has been developed for a weaker version of kCSP, the k bi-constraint path problem which is to compute k disjoint st-paths satisfying a given length constraint and a weight constraint simultaneously (Guo et al. in COCOON, pp. 325–336, 2013). This paper first gives an approximation algorithm with bifactor ratio (Formula presented.) for kCSP using the LP-rounding technique. The algorithm is then improved by adopting a more sophisticated method to round edges. It is shown that for any solution output by the improved algorithm, there exists a real number (Formula presented.) such that the weight and the length of the solution are bounded by (Formula presented.) times and (Formula presented.) times of that of an optimum solution, respectively. The key observation of the ratio proof is to show that the fractional edges, in a basic solution against the proposed linear relaxation of kCSP, exactly compose a graph in which the degree of every vertex is exactly two. At last, by a novel enhancement of the technique in Guo et al. (COCOON, pp. 325–336, 2013), the approximation ratio is further improved to (Formula presented.). © 2015 Springer Science+Business Media New York

Ding D.-S.,Anhui University of Science and Technology | Zhang W.,Anhui University of Science and Technology | Zhou Z.-Y.,Anhui University of Science and Technology | Shi S.,Anhui University of Science and Technology | And 5 more authors.
Physical Review Letters | Year: 2015

Constructing a quantum memory for a photonic entanglement is vital for realizing quantum communication and network. Because of the inherent infinite dimension of orbital angular momentum (OAM), the photon's OAM has the potential for encoding a photon in a high-dimensional space, enabling the realization of high channel capacity communication. Photons entangled in orthogonal polarizations or optical paths had been stored in a different system, but there have been no reports on the storage of a photon pair entangled in OAM space. Here, we report the first experimental realization of storing an entangled OAM state through the Raman protocol in a cold atomic ensemble. We reconstruct the density matrix of an OAM entangled state with a fidelity of 90.3%±0.8% and obtain the Clauser-Horne-Shimony-Holt inequality parameter S of 2.41±0.06 after a programed storage time. All results clearly show the preservation of entanglement during the storage. © 2015 American Physical Society.

Chen Z.,Fuzhou University | Chen Z.,University of Pavia | Casciati F.,University of Pavia
Structural Control and Health Monitoring | Year: 2014

Structural health monitoring systems are conceived to automatically monitor the structural health state in real-time. The high-cost and the labor intensive installation of wired monitoring system suggest that structural monitoring systems be realized of a wireless nature. This study explores the development of a general and high-performance wireless data acquisition system (WDAQS) specifically designed for sensors commonly adopted in structural health monitoring applications.When compared with wired sensor technology, wireless sensor technology suffers limited energy supply, long data collection delay, big noise floor, and data loss. Addressing these issues, in the design of the WDAQS, several features are pursued, including flexible sensor interfaces, high power efficiency, low-noise data acquisition, and real-time and lossless data transmissions. The design of the system is presented in detail in terms of hardware, firmware, and software. Several experiments are carried out to validate and evaluate the system. The results show that the WDAQS is able to acquire high-quality data. Copyright © 2013 John Wiley & Sons, Ltd.

Cheng G.,Fuzhou University | Hu J.-G.,Fuzhou University
IEEE Transactions on Control Systems Technology | Year: 2014

A mode switching control scheme is proposed to achieve fast and precise set-point tracking in motor servo systems. The control scheme incorporates a composite nonlinear feedback (CNF) control law into the framework of proximate time-optimal servomechanism (PTOS). The CNF control law consists of a linear feedback part for achieving fast response and a nonlinear feedback part for suppressing the overshoot, so as to improve the transient performance in short span positioning, while the PTOS control law is responsible for fast acceleration and deceleration when the tracking error is large. A reduced-order extended state observer is designed to estimate the unmeasured velocity and unknown disturbance for feedback and compensation. The closed-loop stability is analyzed theoretically. The control scheme is then applied to the position-velocity control loop in a permanent magnet synchronous motor servo system. Experimental studies have been carried out using the TMS320F2812 digital signal controller board. The results verify that the controlled system is capable of tracking a wide range of target positions fast, smoothly, and accurately, with some degrees of performance robustness against disturbance and uncertainty. © 1993-2012 IEEE.

Hong C.-Y.,Fuzhou University | Chen X.,Fuzhou University | Li J.,Fuzhou University | Chen J.-H.,Fujian Medical University | And 2 more authors.
Chemical Communications | Year: 2014

We have developed a simple method for direct detection of circulating microRNAs in serum by using the p19 protein-functionalized magnetic beads (PFMBs) for specific enrichment and rolling circle amplification (RCA). The detection limit for microRNAs is 1 fM. Therefore, the proposed method has the potential of being used in the analysis of circulating microRNAs and clinical diagnosis. © The Royal Society of Chemistry 2014.

Gao Z.,Fuzhou University | Tang D.,Fuzhou University | Xu M.,Fuzhou University | Chen G.,Fuzhou University | Yang H.,Fuzhou University
Chemical Communications | Year: 2014

A novel homogeneous immunoassay method is developed for sensitive monitoring of small molecular biotoxin by using a portable personal glucose meter (PGM) based on the target-responsive release of cargo (glucose) from a polystyrene microsphere-gated magnetic mesoporous nanocontainer. This journal is © the Partner Organisations 2014.

Wang Y.-M.,Fuzhou University
International Journal of Production Research | Year: 2012

Quality function deployment (QFD) is a methodology to ensure that customer requirements (CRs) are deployed through product planning, part development, process planning and production planning. The first step to implement QFD is to identify CRs and assess their relative importance weights. This paper proposes a nonlinear programming (NLP) approach to assessing the relative importance weights of CRs, which allows customers to express their preferences on the relative importance weights of CRs in their preferred or familiar formats. The proposed NLP approach does not require any transformation of preference formats and thus can avoid information loss or information distortion. Its potential applications in assessing the relative importance weights of CRs in QFD are illustrated with a numerical example. © 2012 Copyright Taylor and Francis Group, LLC.

Chen F.,Fuzhou University | Ma Z.,Fuzhou University | Zhang H.,Fuzhou University
Nonlinear Analysis: Real World Applications | Year: 2012

We investigate the stability property of the positive equilibrium for Lotka-Volterra predator-prey systems incorporating a constant number of prey refuges. By constructing a suitable Lyapunov function, a set of sufficient conditions which ensure the global asymptotical stability of the positive equilibrium is obtained. Our result complements and supplements some known ones. © 2012 Elsevier Ltd. All rights reserved.

Wang Y.-M.,Fuzhou University | Wang Y.-M.,Hefei University of Technology
International Journal of Production Research | Year: 2012

Quality function deployment (QFD) is often implemented to transform customer requirements (CRs) into the engineering design requirements (DRs) of a new product. Prioritising engineering DRs is essential to reasonably allocate resources for the new product development, and often must be done under uncertainty due to the vagueness and impreciseness of the judgments made by customers and QFD team members, and is a typical group decision behaviour that requires the active participation of multiple customers and multiple QFD design team members. Fuzzy set theory provides a theoretical basis for solving such group decision-making problems under uncertainty. Existing approaches for prioritising DRs under uncertainty usually simplify the group decision-making problem as non-group decision making for solution by simply aggregating individuals opinions using their arithmetic averages. This paper proposes a different fuzzy group decision-making procedure for prioritising DRs under uncertainty. The proposed approach does not aggregate the individual judgments of customers and QFD design team members, but rather aggregates the technical importance ratings of DRs, and can produce more rational and robust priority rankings for DRs through fuzzy normalisation. A real design case of a flexible manufacturing system (FMS) is examined to show the effectiveness and the potential applications of the proposed approach. Results are compared with those obtained by two known approaches. © 2012 Copyright Taylor and Francis Group, LLC.

Weng B.,Fuzhou University | Yang M.-Q.,Fuzhou University | Zhang N.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

A series of uniform ZnO nanospheres-reduced graphene oxide nanocomposites (ZnO-RGO NCs) with different weight addition ratios of RGO are successfully synthesized via a facile yet efficient method by intimately coating ZnO nanospheres (NSs) with RGO, which is afforded by electrostatic attraction between positively charged ZnO NSs and negatively charged graphene oxide (GO) in an aqueous medium at room temperature. The photocatalytic test of degradation of Rhodamine B shows that the optimal ZnO-10% RGO NCs exhibit a 5-fold enhancement of photoactivity than bare ZnO NSs, which is ascribed to the integrative synergetic effect of enhanced adsorption capacity, the decreased recombination of the electron-hole pairs and the enhanced ultraviolet light absorption intensity. Significantly, the recycled photoactivity tests show that, for ZnO-RGO NCs, the anti-photocorrosion of ZnO NSs is improved remarkably which is attributed to the effective hybridization of ZnO NSs with the RGO sheet via intimate surface coating. Such a significant photoactivity enhancement and anti-photocorrosion phenomenon can not be obtained by simply integrating RGO with ZnO NSs that are not subject to surface charge modification, which thus indicates the importance of intimate surface coating of ZnO with RGO toward the efficiency of enhancement of photoactivity and particularly the anti-photocorrosion of ZnO. © 2014 the Partner Organisations.

Ren Z.,Fuzhou University | Zhang J.,Fuzhou University | Xiao F.-X.,Fuzhou University | Xiao G.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

The cadmium sulfide (CdS) microsphere decorated graphene (GR) nanocomposite (GR-CdS) was prepared by a facile hydrothermal approach in which CdS ingredients were closely enwrapped by the GR scaffold. The GR-CdS nanocomposite was subjected to a number of characterizations including X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), field emission scanning electron microscopy (FESEM), transmission scanning electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that integration of CdS microspheres with two-dimensional GR scaffolds exerts a profound influence on the properties of hybrid nanocomposites, such as optical and electronic nature along with morphology. Photocatalytic performances of the GR-CdS nanocomposites were evaluated by selective organic transformation under mild conditions. The results demonstrate that the GR-CdS nanocomposite can serve as an efficient visible-light-driven photocatalyst for the selective oxidation of benzyl alcohol to benzaldehyde under ambient conditions. The significantly enhanced photocatalytic performance of GR-CdS nanocomposites can be attributed to the synergistic effect of enhanced light absorption intensity and high electron conductivity of GR, which facilitates charge separation and lengthens the lifetime of photogenerated electron-hole pairs. Moreover, photocatalytic performances of various GR-CdS nanocomposites featuring different degrees of interfacial contact between GR and CdS were also systematically explored. It is anticipated that our work could enrich the information on the preparation of narrow bandgap semiconductor/GR hybrid nanocomposites for a wide range of photocatalytic applications. © 2014 the Partner Organisations.

Yang J.,Fuzhou University | Xiong P.,Fuzhou University | Zheng C.,Fuzhou University | Qiu H.,Fuzhou University | Wei M.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

A layered structure Ni-based MOF was synthesized and, for the first time, was used as the electrode material for a supercapacitor. It exhibited large specific capacitance, high rate capability and cycling stability. Capacitances of 1127 and 668 F g-1 can be achieved at rates of 0.5 and 10 A g-1, respectively. At the same time, over 90% performance was retained after 3000 cycles. These excellent electrochemical properties may be related to the intrinsic characteristics of Ni-based MOF materials. This journal is © the Partner Organisations 2014.

Liu S.,Fuzhou University | Yang M.-Q.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

Ternary hybrids of (reduced graphene oxide)-(CdS nanowire)-TiO2 nanocomposites (CTG) featuring a large two-dimensional (2D) flat structure have been successfully synthesized via a simple surface charge promoted self-assembly method. Compared to the curly (reduced graphene oxide)-(CdS nanowire) nanocomposites (CG) synthesized by a similar approach, CTG possesses a large 2D flat structure, which not only provides high optical transparency and a large surface area but also facilitates the migration of photogenerated electrons. This large 2D flat structure of CTG leads to increased optical absorption of visible light and increased electrical conductivity as compared to the curly CG, which is attributed to the fact that the large 2D flat structure of reduced graphene oxide (RGO) in CTG provides more efficient contact between light and the RGO sheets and facilitates the transfer of charge carriers. Experimental evidence has proven that negatively charged TiO2 nanoparticles (NPs) both on the surfaces of the CdS nanowires (CdS NWs) and on the RGO sheets can prevent the RGO sheets from becoming curly or aggregated as a result of electrostatic repulsion, thereby forming the large 2D flat structure of CTG. In addition to using RGO as an electron "sink" to improve the transfer of photogenerated electron-hole pairs (EHPs) from CdS NWs, the TiO2 NPs on CdS NWs are able to further boost the transfer of charge carriers in the ternary CTG system due to the suitable energy band match between TiO2 and CdS. Such efficient, spatially separated charge carriers make CTG a versatile visible light photocatalyst for photo-redox processes. This work provides a new, simple strategy to construct these large 2D flat structured RGO-based multi-component composites by using the surface charge properties of materials to efficiently utilize their respective unique electronic properties toward diverse photo-redox processes in both energy conversion and environmental purification. © 2013 The Royal Society of Chemistry.

Wang S.H.,Fuzhou University | Xu X.,Fuzhou University | Wai P.K.A.,Hong Kong Polytechnic University
Optics Express | Year: 2015

A comprehensive theoretical model to investigate phase matching in degenerate polarized fiber optical parametric amplifiers (FOPAs) in randomly birefringent fibers is developed. We show that in the small signal region, simulation results from the proposed model agree well with the experimental results. It was also shown that four waves mixing (FWM) effect could compensate polarization mode dispersion (PMD) induced phase mismatch. Similar to counter-propagating fiber Raman amplifiers (FRAs), the degree of polarization of FOPAs approaches unity exponentially with the gain but at a larger rate 1/Γ. Thus larger polarization-pulling can be achieved in FOPAs than the counter-propagating FRAs for the same gain. © 2015 Optical Society of America.

Lan T.,Fuzhou University | Liu Y.,Fuzhou University | Dou J.,Fuzhou University | Hong Z.,Fuzhou University | Wei M.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

Hierarchically porous rutile TiO2 microspheres composed of nanorods were fabricated by using a facile synthetic route. These materials were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, and scanning and transmission electron microscopy (SEM and TEM). Based on a series of experimental results, a self-assembly process for the formation of the hierarchical microspheres was also proposed. Furthermore, the hierarchically porous rutile TiO2 microspheres were used as the negative electrode material in lithium-ion batteries (LIBs) and demonstrated a large reversible charge-discharge capacity of 160.4 mA h g-1 after 100 cycles at 1 C, which was much greater than commercial rutile TiO2 under the same conditions, indicating that these materials had excellent cycling stability and high rate performance. © 2014 The Royal Society of Chemistry.

Qiu L.,Fuzhou University | Huang Z.,Fuzhou University
World Journal of Microbiology and Biotechnology | Year: 2010

Laccase, a so-called "blue-copper" oxidase, is able to oxidize a variety of organic compounds. Sol-gel derived silica glasses are frequently adopted as an immobilization method to improve the stability of enzymes and make them reusable. In this study, immobilization conditions were optimized to achieve improved embedding results. The thermal stability, reaction stability and storage stability were improved with the immobilized enzyme when compared to the free enzyme. 2,4-Dichlorophenol (DCP) and 2,4,6-trichlorophenol (TCP) were chosen as model compounds. The treatment of chlorophenols (CPs) by immobilized laccase demonstrated excellent removal and response stability. The affinity of TCP for immobilized laccase was higher than that of DCP. This finding leads to different removal efficiencies under variable conditions (reaction time, initial concentration, dosage of immobilized laccase and removal rate in mixed solution). By fitting the experimental data with the diffusion model of the degradation process, the degradation of CPs by immobilized laccase matches an intraparticle diffusion-controlled model. © Springer Science+Business Media B.V. 2009.

Improving operation efficiency has become an important development strategy for many airport companies. However, there is little research on these companies' operating process decomposition or discussing the causes of inefficiency in sub-processes. This study evaluates the overall efficiency and the operational efficiencies of aeronautical service sub-process and commercial service sub-process for 10 East Asia airport companies from 2009 to 2013 using Network Data Envelopment Analysis (NDEA) and identifies the key influencing factors of respective sub-processes efficiency by employing the Panel Data model. The first-stage NDEA results indicate that only Airport Authority Hong Kong in 2012 and 2013 performed efficiently in both sub-processes and achieved overall efficiency. The overall efficiencies of all other companies are not high. During the entire study period, in aeronautical service sub-process, Beijing Capital International Airport Co., Ltd. and Shanghai International Airport Co., Ltd. performed efficiently, while in commercial service sub-process, only Hong Kong airport performed efficiently. The second-stage regression analysis implies the number of airlines served and the number of destinations have significant and positive influences on the efficiency of aeronautical service. Non-aeronautical revenues and service quality have significant and positive influences on commercial service efficiency. © 2015 Elsevier Ltd.

Yuan L.,Fuzhou University | Yang M.-Q.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

ZnIn2S4-graphene (GR) nanocomposites have been fabricated by a low-temperature and one-step wet chemistry process, during which the formation of ZnIn2S4 nanosheets, the reduction of graphene oxide (GO) and intimate interfacial contact between them were achieved simultaneously. The as-prepared ZnIn2S4-GR exhibited remarkably enhanced visible light photocatalytic performance toward selective reduction of nitroaromatics to amines in water compared to blank ZnIn 2S4. Controlled experiments have been carried out and revealed that an inert atmosphere and the addition of a hole scavenger are two important conditions for photocatalytic selective reduction of nitroaromatics over ZnIn2S4-GR. In comparison with blank ZnIn 2S4, the remarkably enhanced photocatalytic performance of ZnIn2S4-GR can be mainly attributed to the integrative effect of the unique physicochemical properties of GR and the intimate interfacial contact between ZnIn2S4 and GR. Specifically, the introduction of GR into the matrix of ZnIn2S4 can significantly influence the morphology and structure of the samples owing to the "structure-directing" role of GO, enhance the adsorptivity of the substrate, and effectively promote the separation and transfer of photogenerated charge carriers, thereby contributing to the photoactivity enhancement. It is hoped that the current work on the facile synthesis of ZnIn2S 4-GR nanocomposites can broaden the applications of ZnIn 2S4-GR and other GR-based nanocomposites as visible-light-driven photocatalysts toward selective organic transformations under mild conditions. © the Partner Organisations 2014.

Long B.,Fuzhou University | Lin J.,Fuzhou University | Wang X.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

A cheap and easily-available organosulfur compound, guanidine thiocyanate, has been used to synthesize graphitic carbon nitride (g-C3N 4) by a thermally-induced desulfurization and polymerization of the precursor. Photocatalytic activity experiments demonstrated that the g-C 3N4 synthesized from guanidine thiocyanate exhibited a much higher H2 evolution rate than the reference sample prepared from dicyanamide. Further improvement in the activity was achieved by optimization of the condensation temperature. Based on X-ray photoelectron spectroscopy analysis, the samples synthesized at a high temperature of 700 °C feature a high crystallinity and a low density of surface defects, with an enhanced optical absorbance extending to the visible light region. As a result, the sample prepared at 700 °C has been found to be 7 times more reactive towards photocatalytic hydrogen evolution than the sample polymerized at the normal temperature of 550 °C. Other guanidine halides have also been applied to synthesize g-C3N4 materials, and the structure and activity of the resultant g-C3N4 were compared to the carbon nitride polymer from guanidine thiocyanate. © 2014 The Royal Society of Chemistry.

Yang M.-Q.,Fuzhou University | Weng B.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

In2S3-carbon nanotube (In2S 3-CNT) nanocomposites have been prepared via a facile refluxing wet chemistry process. The as-synthesized In2S3-CNT nanocomposites can be used as selective and active visible-light-driven photocatalysts toward hydrogenation of nitroaromatics to amines in water. Photoirradiation (λ > 420 nm) of In2S3-CNT photocatalysts suspended in water containing nitroaromatics produces the corresponding amines with high yields. The control experiments reveal that an inert atmosphere and the addition of a hole scavenger are both indispensable for the visible-light-driven photocatalytic hydrogenation of nitroaromatics over In2S3-CNT. In comparison with blank In2S 3, the obviously enhanced photocatalytic performance of the In 2S3-CNT photocatalyst is mainly ascribed to the unique physicochemical properties of CNTs, which enhances the adsorptivity of the substrate and performs as an electron reservoir to trap electrons, thereby hindering the recombination of photogenerated electron-hole pairs. It is hoped that the current work on the facile synthesis of semiconductor In 2S3-CNT nanocomposites can broaden the applications of semiconductor-carbon based composite photocatalysts in the field of photocatalytic selective organic transformations under mild conditions. © 2014 The Royal Society of Chemistry.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

I present a feasible scheme to investigate the geometric phase for an atom trapped in an optical cavity induced by the effective decay process due to cavity-photon loss. The cavity mode, together with the external driving fields, acts as the engineered environment of the atom. When the parameters of the reservoir are adiabatically and cyclically changed, the system initially in the nontrivial dark state of the effective Lindblad operator undergoes a cyclic evolution and acquires a geometric phase. The geometric phase can be observed with the atomic-Ramsey-interference oscillation in the decoherence-free subspace. © 2012 American Physical Society.

Zhao R.,Fuzhou University | Xu M.,Fuzhou University | Wang J.,Fuzhou University | Chen G.,Fuzhou University
Electrochimica Acta | Year: 2010

In this paper, a novel solid state pH sensor was fabricated by anodization of titanium substrate electrode. The relationship between pH sensitivity and hydrophilicity or surface morphology of TiO2 film was investigated. Amorphous TiO2 nanotube has better pH response than anatase TiO 2 nanotube. After being irradiated by ultraviolet light (UV), the potential response of the electrode modified by amorphous TiO2 nanotube was close to Nernst equation (59 mV/pH). SEM, XRD, and XPS were used to characterize electrodes. Possible mechanism was discussed by analyzing surface hydroxyl groups, crystal structure and hydrophilicity of the electrodes. The electrode has been used to detect some kinds of soft drinks and shows good response. © 2010 Elsevier Ltd. All rights reserved.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

The Berry phase acquired by an electromagnetic field undergoing an adiabatic and cyclic evolution in phase space is a purely quantum-mechanical effect of the field. However, this phase is usually accompanied by a dynamical contribution and cannot be manifested in any light-beam interference experiment because it is independent of the field state. We here show that such a phase can be produced using an atom coupled to a quantized field and driven by a slowly changing classical field, and it is manifested in atomic Ramsey interference oscillations. We also show how this effect may be applied to one-step implementation of multiqubit geometric phase gates, which is impossible by previous geometric methods. The effects of dissipation and fluctuations in the parameters of the pump field on the Berry phase and visibility of the Ramsey interference fringes are analyzed. © 2012 American Physical Society.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We show that with the assistance of a third level of qubits an n-qubit phase gate can be constructed from 2n-4 two-qutrit conditional swap gates, a single qutrit-qubit controlled phase gate, and two single-qutrit operations. Unlike previous schemes, our scheme uses the auxiliary level to "expose" some state to the qutrit-qubit controlled phase gate, instead of using it to "hide" states from the conditional dynamics. Neither the number of the additional levels nor that of single-qutrit operations needs to increase with n. We propose a physical implementation of the required elementary gates in cavity QED and show that the total gate time may be greatly reduced compared with that required in previous methods. © 2012 American Physical Society.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We propose an efficient scheme for realizing squeezing for both an atomic ensemble and a cavity field via adiabatic evolution of the dark state of the atom-cavity system. Controlled symmetry breaking of the Hamiltonian ensures a unique dark state for the total system, in which the atomic system or cavity mode is squeezed depending upon the choice of the detunings. Since the generation of the atomic squeezed state requires neither the cavity mode nor the atomic system to be excited, the decoherence effects are effectively suppressed. The scheme is insensitive to the uncertainty in the atomic number and imperfect timing, and the time needed for the generation of the desired squeezed state decreases as the size of the system grows. The required experimental techniques are within the scope of what can be obtained in the present cavity QED setups. © 2012 American Physical Society.

Zhang Y.,Fuzhou University | Zhang N.,Fuzhou University | Tang Z.-R.,Fuzhou University | Xu Y.-J.,Fuzhou University
Physical Chemistry Chemical Physics | Year: 2012

Incessant interest has been shown in the synthesis of graphene (GR)-semiconductor nanocomposites as photocatalysts aiming to utilize the excellent electron conductivity of GR to lengthen the lifetime of photoexcited charge carriers in the semiconductor and, hence, improve the photoactivity. However, research works focused on investigating how to make sufficient use of the unique electron conductivity of GR to design a more efficient GR-semiconductor photocatalyst have been quite lacking. Here, we show a proof-of-concept study on improving the photocatalytic performance of GR-TiO 2 nanocomposites via a combined strategy of decreasing defects of GR and improving the interfacial contact between GR and the semiconductor TiO 2. The GR-TiO 2 nanocomposite fabricated by this approach is able to make more sufficient use of the electron conductivity of GR, by which the lifetime and transfer of photoexcited charge carriers of GR-TiO 2 upon visible light irradiation will be improved more efficiently. This in turn leads to the enhancement of visible-light-driven photoactivity of GR-TiO 2 toward selective transformation of alcohols to corresponding aldehydes using molecular oxygen as a benign oxidant under ambient conditions. It is anticipated that our current work would inform ongoing efforts to exploit the rational design of smart, more efficient GR-semiconductor photocatalysts for conversion of solar to chemical energy by heterogeneous photocatalysis. © 2012 the Owner Societies.

Yang K.,Fuzhou University | Liu J.,Fuzhou University | Si R.,Fuzhou University | Chen X.,Fuzhou University | And 2 more authors.
Journal of Catalysis | Year: 2014

The catalytic performance of Au/TiO2 for oxidizing CO in an H2-rich stream under visible light irradiation was compared with that of Au/Al2O3. It is found that the visible light can promote the preferential oxidation of CO in the presence of H2 over Au/TiO2, while it promotes the oxidation of CO but suppresses its selectivity in the same case over Au/Al2O3. The chemisorption results show that this visible light can promote the adsorption of CO in the presence of H2 and its activation at Au sites over Au/TiO2, but suppress the adsorption of CO over Au/Al 2O3. Based on the photo-electrochemical and other photo-response performances of two catalysts, it is proposed that the effect of visible light on CO adsorption and then oxidation over the supported Au catalyst may be dependent on the electron transfer behavior between Au and support induced by the localized surface plasmon resonance of Au nanoparticles. © 2014 Elsevier Inc. All rights reserved.

Zhang N.,Fuzhou University | Zhang Y.,Fuzhou University | Pan X.,Fuzhou University | Fu X.,Fuzhou University | And 2 more authors.
Journal of Physical Chemistry C | Year: 2011

A series of cadmium sulfide-graphene (CdS-GR) nanocomposites with different weight addition ratios of graphene (GR) have been synthesized via a facile one-step hydrothermal approach, during which the formation of CdS nanoparticles and the reduction of graphene oxide (GO) occur simultaneously. X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (DRS), field-emission scanning electron microscopy (FE-SEM), transmission scanning electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), nitrogen adsorption-desorption, photoluminescence spectra (PL), and electron spin resonance spectra (ESR) are employed to determine the properties of the samples. It is found that the CdS nanoparticles evenly overspread on the graphene scaffold, and the properties of the samples, including morphology, pore structure, optical, and electronic nature, are able to be tuned by the addition of GR as compared with blank-CdS prepared in the absence of GR. The photocatalytic activities of the as-prepared CdS-GR nanocomposites are evaluated by selective oxidation of a range of alcohols under mild conditions. To our best knowledge, it is the first time to use CdS-GR nanocomposites as visible light photocatalyst for selective organic transformation. Our results demonstrate that the as-prepared CdS-GR nanocomposites can serve as a promising visible-light-driven photocatalyst for selective oxidation of alcohols to corresponding aldehydes. The high photoactivity of CdS-GR can be ascribed to the integrative effect of enhanced light absorption intensity, high electron conductivity of GR, and its significant influence on the morphology and structure of the samples. It is hoped that our current work could widen the application of CdS-GR nanocomposites and open promising prospects for the utilization of GR-based semiconductor nanocomposites as visible light photocatalyst for selective organic transformations. © 2011 American Chemical Society.

Lin S.,Nanjing University | Lin S.,Fuzhou University | Xie D.,Nanjing University | Guo H.,University of New Mexico
Journal of Physical Chemistry C | Year: 2011

PdZn alloy has been shown to catalyze methanol steam reforming (MSR), producing hydrogen gas and carbon dioxide with high selectivity. Despite many studies, the mechanism for MSR on this catalyst is still not completely understood. In this work, several possible pathways of MSR are explored using a plane-wave density functional theory. The focus is placed on the reaction network starting from a facile reaction between adsorbed formaldehyde and hydroxyl species, produced from the decomposition of methanol and water, respectively. These pathways were found to have barriers lower than the rate-limiting step, namely, the dehydrogenation of methoxyl, and they involve species that have been detected in various experiments. Interestingly, the reaction pathways share many similarities with the MSR process on copper, which is the traditional catalyst for MSR. © 2011 American Chemical Society.

Zhang N.,Fuzhou University | Liu S.,Fuzhou University | Fu X.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Physical Chemistry C | Year: 2011

The core-shell nanocomposites of M@TiO 2 (M = Au, Pd, Pt) have been synthesized successfully via a facile hydrothermal treatment of TiF 4 precursor and noble metal colloid particles. Their properties were determined by a collection of joint techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction spectra (XRD), ultraviolet/visible diffuse reflectance spectra (DRS), photoluminescence spectra (PL), and electron spin resonance spectra (ESR). Photocatalytic degradation of Rhodamine B (RhB) in the liquid phase served as a probe reaction to evaluate the activity of the as-prepared M@TiO 2 (M = Au, Pd, Pt) core-shell nanocomposites under the irradiation of both visible light and ultraviolet (UV) light. The results reveal that these core-shell nanocomposites possess tunable photoreactivity. It is interesting to find that the incorporation of noble metal core into the shell of TiO 2 only contributes to enhancement of visible light photocatalytic activity of TiO 2. The noble metal cores are believed to play an essential role in affecting the photoreactivity because they are able to trap electrons, improve the electron-hole pairs life, and enhance the visible light absorption intensity that are all beneficial for enhancement of the visible light photocatalytic activity of TiO 2. However, the incorporation of noble metal core significantly lowers the UV light absorption intensity, thus leading to the obervation that, under UV light irradiation, the bare TiO 2 still exhibits higher activity than M@TiO 2 core-shell nanocomposites. The possible radical species involved in the degradation of RhB were analyzed by means of the PL and ESR techniques. Recycled activity tests demonstrate that the incorporation of metal core into the shell of TiO 2 will inhibit the photocorrison behavior and provide much better photocatalytic stability of M@TiO 2 (M = Au, Pd, Pt) nanocomposites than the bare TiO 2. It is hoped that our work could render guided information for steering toward the design and application of TiO 2-coated core-shell nanomaterials with tunable photocatalytic activity. © 2011 American Chemical Society.

Guo L.,Fuzhou University | Yin N.,Fuzhou University | Chen G.,Fuzhou University
Journal of Physical Chemistry C | Year: 2011

Fluorescence spectra of thymine-containing oligonucleotides labeled with donor/acceptor in the presence of Hg2+ ions were investigated. Formation of T-Hg2+-T base pairs gives rise to a hairpin structure and makes both termini of the oligonucleotide close to each other. For fluorescein or tetramethylrhodamine single-labeled oligonucleotide, fluorescence quenching was observed on addition of Hg2+ ions. For fluorescein and tetramethylrhodamine double-labeled oligonucleotide, the apparent FRET efficiencies decrease unexpectedly in the presence of Hg2+ ions. The unusual fluorescence quenching in the presence of Hg2+ ions was ascribed to formation of T-Hg2+-T base pairs, which can accept and mediate the electron transfer and provide an additional de-excitation process for the excited state of fluorophores via photoinduced electron transfer. © 2011 American Chemical Society.

Tang Z.-R.,Fuzhou University | Li F.,Fuzhou University | Zhang Y.,Fuzhou University | Fu X.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Physical Chemistry C | Year: 2011

The nanocomposites of one-dimensional titanate nanotubes and carbon nanotubes (TNT-CNT) have been synthesized by controlling the preparation conditions carefully during the hydrothermal treatment of TiO2 nanoparticles and carbon nanotube (CNT) in a concentrated alkali solution and the subsequent post-treatment. Using the gas-phase degradation of benzene, a volatile aromatic pollutant commonly present in urban atmosphere, as a testing reaction we for the first time have investigated the photocatalytic performance of TNTs and TNT-CNT nanocomposites together. The results show that one-dimensional tubular TNT exhibits enhanced photocatalytic performance toward the gas-phase degradation of benzene as compared to the reference photocatalyst of bare P25-TiO2 nanoparticles. Doping a certain amount of CNT into the matrix of TNT affects the conversion ratio of benzene only slightly; however, the mineralization ratio for degradation of benzene is remarkably increased to about 90%. This observation is particularly interesting because it is markedly different from that over the nanocomposites of TiO2 nanoparticles and CNT. The possible reasons have been put forward based on the results of photocatalytic activity and analysis of detailed characterization results including the transmission electron microscopy and electron spin resonance spectra. We ascribe the high mineralization ratio for benzene degradation over TNT-CNT to the following factors, that is, the unique one-dimensional nanotubular morphology associated with TNT-CNT, enhanced adsorptivity of benzene due to the doping of CNT, and enhanced light absorption intensity. In particular, the former factor of nanotubular morphology plays a more important role on enhancement of the mineralization ratio for degradation of benzene because the latter two factors are also found over the composites of TiO2 nanoparticles and CNT. Moreover, in view of the facile availability of tunable optical properties of TNT via substitution of sodium ions and proton ions in TNT with transition metal ions, there would be a wide scope to optimize the photocatalytic performance of TNT-based one-dimensional materials and their nanocomposites with CNT, which could be an interesting research topic with regard to TiO2-carbon composites as photocatalyst for the environmental remediation. © 2011 American Chemical Society.

Zhang N.,Fuzhou University | Liu S.,Fuzhou University | Fu X.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Physical Chemistry C | Year: 2011

The Pd@CeO2 semiconductor nanocomposite with "plum-pudding" structure has been fabricated successfully via a facile low-temperature hydrothermal reaction of polyvinylpyrrolidone (PVP)-capped Pd colloidal particles and cerium chloride precursor followed by a calcination process in air. Different characterization techniques, including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission scanning electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), UV-vis diffuse reflectance spectra (DRS), X-ray photoelectron spectra (XPS), photoluminescence spectra (PL), nitrogen adsorption-desorption, and electron spin resonance spectra (ESR), have been used to investigate the structure and properties of the Pd@CeO2 nanocomposite. It is found that the nanosized Pd particles are evenly dispersed into the matrix of CeO2, thus forming a plum-pudding structure, i.e., multi-Pd core@CeO2 shell configuration. This unique nanostructure endows the Pd@CeO2 nanocomposite with enhanced activity and selectivity toward the visible-light-driven oxidation of various benzylic alcohols to corresponding aldehydes using dioxygen as oxidant at room temperature and ambient pressure compared with a supported Pd/CeO2 nanocomposite and nanosized CeO2 powder. The formation of the multi-Pd core@CeO2 shell structure can be understood by a synergistic interaction of heterogeneous seeded growth process, monolayer-capped core coalescence, and shell re-encapsulation. Together with the previous report, it can be concluded that the intrinsic structure nature of noble metal colloids is able to play a key role in affecting the formation process of noble metal core@semiconductor shell nanocomposites, by which we can realize the design and preparation of different specific core-shell nanostructures with atomic scale accuracy. It is hoped that our current work could open promising prospects of the fabrication of multimetal core@semiconductor shell nanocomposites and their application to visible-light-driven selective organic transformations. © 2011 American Chemical Society.

Chen X.,Fuzhou University | Pan H.,Fuzhou University | Liu H.,Fuzhou University | Du M.,Fuzhou University
Electrochimica Acta | Year: 2010

A novel nonenzymatic glucose sensor based on flower-shaped (FS) Au@Pd core-shell nanoparticles-ionic liquids (ILs i.e., trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl) imide, [P(C6)3C 14][Tf2N]) composite film modified glassy carbon electrodes (GCE) was reported. The Au@Pd nanocatalysts were prepared by seed-mediated growth method, forming the three-dimensional FS nanoparticles, where tens of small Pd nanoparticles (∼3 nm) aggregated on gold seeds (∼20 nm). The FS Au@Pd nanoparticle was a good candidate for the catalytic efficiency of nanometallic surfaces because of its flower-shaped nature, which has greater adsorption capacity. XPS analysis and zeta potential indicated that the surface of Pd atoms is positively charged, profiting the oxidation process of glucose. And ILs acted as bridge connecting Au@Pd one another and bucky gel as platform within the whole nanocomposite. So the modified electrode has higher sensitivity and selectivity owing to intrinsic synergistic effects of this nanocomposite. Amperometric measurements allow observation of the electrochemical oxidation of glucose at 0.0 V (vs. Ag/AgCl), the glucose oxidation current is linear to its concentration in the range of 5 nM-0.5 μM, and the detection limit was found to be 1.0 nM (S/N = 3). The as-prepared nonenzyme glucose sensor exhibited excellent stability, repeatability, and selectivity. © 2010 Elsevier Ltd. All rights reserved.

Zhou X.,Fuzhou University | Zhou X.,City University of Hong Kong | Li Y.F.,City University of Hong Kong | He B.,Fuzhou University
Signal Processing | Year: 2014

Tracking multiple moving targets in video is a challenge because of the presence of noisy video data and varying numbers of targets, and data association problems. In this paper, a multi-target visual tracking system that combines object detection with the Gaussian mixture probability hypothesis density filter is developed, in which a new birth intensity estimation method based on entropy distribution and coverage rate is proposed. The birth intensity is first initialized by the previously obtained target states and measurements. The measurements are obtained by object detection and are classified into the birth measurements and the survival measurements. The currently obtained birth measurements are then used to update the birth intensity. In the update stage, the entropy distribution is incorporated to remove some noises within the initialized birth intensity that are irrelevant to the birth measurements. The coverage rate between each birth intensity component and the corresponding birth measurement is computed to further eliminate the noises. Experiments on noisy video sequences are conducted to show the good performance of the proposed visual tracking system. © 2013 Elsevier B.V.

Luo H.,Fuzhou University | Wei M.,Fuzhou University | Wei K.,Fuzhou University
Materials Chemistry and Physics | Year: 2010

In this study, Nb2O5 nanosheets were first synthesized using NbO2 particles as the precursor via a simple hydrothermal route. The synthesized Nb2O5 nanosheets are highly crystalline and their thicknesses are found to be ca. 3-5 nm. Based on the experimental results of XRD, SEM and TEM measurements, a possible mechanism for the formation of nanosheets was discussed. An electrode materials made of the product containing Nb2O5 nanosheets shows a larger capacity of 355 mAh g-1 at a current density of 0.1 A g-1. Cyclic measurements indicate that such an electrode exhibits a high reversible charge/discharge capacity and cycling stability. This might be attributed to the intrinsic characteristics of Nb2O5 nanosheets. © 2009 Elsevier B.V. All rights reserved.

Tang D.,Fuzhou University | Cui Y.,Fuzhou University | Chen G.,Fuzhou University
Analyst | Year: 2013

Recent research has looked to develop innovative, powerful and novel biofunctionalized nanoparticles, controlling and tailoring their properties in a very predictable manner to meet the needs of clinic immunoassays in the biomedical field. This minireview briefly summarizes recent advances covering the last 3 years, exploiting nanoparticle-based electrochemical, optical, mass-sensitive, colorimetric and immunodipstick assays. The enormous signal enhancement associated with the use of nanoparticles and formation of nanoparticle-antibody-antigen assemblies provide the basis for sensitive detection of disease-related proteins or biomarkers. Rather than being exhaustive, this minireview focuses on selected examples to illustrate novel concepts and promising applications. Finally, a small amount of speculation of possible future developments in nanoparticle-based immunoassays is provided. This journal is © 2013 The Royal Society of Chemistry.

Pei X.,Fuzhou University | Zhang B.,Fuzhou University | Tang J.,Fuzhou University | Liu B.,Fuzhou University | And 2 more authors.
Analytica Chimica Acta | Year: 2013

Methods based on sandwich-type immunosensors and immunoassays have been developed for detection of multivalent antigens/analytes with more than one eptiope due to the use of two matched antibodies. High-affinity antibodies and appropriate labels are usually employed for the amplification of detectable signal. Recent research has looked to develop innovative and powerful novel nanoparticle labels, controlling and tailoring their properties in a very predictable manner to meet the requirements of specific applications. This articles reviews recent advances, exploiting nanoparticle labels, in the sandwich-type immunosensors and immunoassays. Routine approaches involve noble metal nanoparticles, carbon nanomaterials, semiconductor nanoparticles, metal oxide nanostructures, and hybrid nanostructures. The enormous signal enhancement associated with the use of nanoparticle labels and with the formation of nanoparticle-antibody-antigen assemblies provides the basis for sensitive detection of disease-related proteins or biomolecules. Techniques commonly rely on the use of biofunctionalized nanoparticles, inorganic-biological hybrid nanoparticles, and signal tag-doped nanoparticles. Rather than being exhaustive, this review focuses on selected examples to illustrate novel concepts and promising applications. Approaches described include the biofunctionalized nanoparticles, inorganic-biological hybrid nanoparticles, and signal tage-doped nanoparticles. Further, promising application in electrochemical, mass-sensitive, optical and multianalyte detection are discussed in detail. © 2012 Elsevier B.V.

Hong Z.,Fuzhou University | Zheng X.,Fuzhou University | Ding X.,Fuzhou University | Jiang L.,Fuzhou University | And 2 more authors.
Energy and Environmental Science | Year: 2011

Complex spinel titanate Li 2MTi 3O 8 (M = Co, Zn, Co 0.5Zn 0.5) nanowires have been synthesized via a simple synthetic route using titanate nanowires as a precursor. The nanowires are highly crystalline and have been used for the first time as the anode material in a rechargeable lithium-ion battery. The battery has exhibited a highly reversible charge-discharge capacity and excellent cycling stability, even at a current density as high as 3.2 A g -1. This result can be attributed to the intrinsic characteristics of spinel Li 2MTi 3O 8 nanowires. A three-dimensional network could provide a diffusion space for lithium ion insertion into and extraction from the anode material, resulting in very good cycle performance, even at a high rate. © The Royal Society of Chemistry 2011.

Cui Y.,Fuzhou University | Ding Z.,Fuzhou University | Liu P.,Fuzhou University | Antonietti M.,Max Planck Institute of Colloids and Interfaces | And 2 more authors.
Physical Chemistry Chemical Physics | Year: 2012

Semiconducting carbon nitride materials were successfully prepared via a thermal poly-condensation of dicyandiamide as a precursor at >500 °C. The resulting materials were investigated as metal-free catalysts for the activation of H2O2 with visible light under mild conditions, using the decomposition of Rhodamine B (RhB) in aqueous solution as a model reaction. Results revealed that carbon nitride catalysts can activate H2O2 to generate reactive oxy-radicals under visible light irradiation without employment of any metal additives, leading to the mineralization of the dye. Factors affecting the degradation of organic compounds are pH values and the concentration of H2O2. Recycling of the catalyst indicated no obvious deactivation during the entire catalytic reaction, indicating good (photo)chemical stability of metal-free polymeric carbon nitride photocatalysts for environmental purification. This study demonstrated a promising approach for the activation of green oxidant, hydrogen peroxide, by the newly-developed polymer photocatalysts for environmental remediation and oxidation catalysis. © 2012 the Owner Societies.

Liu Y.,Fuzhou University | Lan T.,Fuzhou University | Zhang W.,Fuzhou University | Ding X.,Fuzhou University | Wei M.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

In the present work, a one-step synthetic route is developed for fabricating hierarchical anatase TiO2 microspheres for the first time. These microspheres are composed of ultrathin rod-like structures in the radial direction, in which ultrathin rods consisted of tiny octahedra via a growth model of oriented attachment. Based on XRD and electron microscopic analyses, a mechanism for the growth of the microspheres is proposed. This material displays a large capacity of 157.3 mA h g-1 at 1 C after 200 cycles and also exhibits high rate performance and excellent cycling stability. These high performance characteristics may be due to the intrinsic characteristics of the hierarchical porous anatase TiO2 microspheres, in which the porous structure can permit facile diffusion of the electrolyte. They can also enhance the contact between the electrode surface and the electrolyte, while the ultrathin rods can shorten the transport distance of Li-ions and electrons during electrochemical cycling. At the same, the porous microsphere can also accommodate volume changes in the charge-discharge process. © The Royal Society of Chemistry 2014.

Han C.,Fuzhou University | Yang M.-Q.,Fuzhou University | Zhang N.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Materials Chemistry A | Year: 2014

By embedding noble metal palladium (Pd) into the interfacial layer matrix of graphene (GR) and semiconductor CdS, we have successfully constructed ternary CdS-(GR-Pd) nanocomposites with intimate interfacial contact. The CdS-(GR-Pd) nanocomposites show remarkably enhanced photocatalytic activity toward selective redox reactions under visible light irradiation as compared to blank-CdS and the optimum binary CdS-GR. It is revealed that the photocatalytic performance enhancement of CdS-(GR-Pd) is ascribed to the optimized spatial charge carrier transfer across the interface resulting from the introduction of Pd nanoparticles as mediators into the interfacial layer between GR and CdS. One role of Pd is to serve as electron reservoir to directly trap photogenerated electrons from CdS and the other role is as interfacial mediator to promote electron relay in the ternary CdS-(GR-Pd) photocatalysts along with conductive graphene as dual co-catalysts. Moreover, the negative light "shielding effect" of GR can be partially counterbalanced through such a facile strategy. This work substantiates the feasibility of adopting the "interfacial-mediator" strategy to optimize the interfacial charge carriers transfer pathway and efficiency for improved photoactivity of GR-semiconductor nanocomposites toward target photoredox reactions. © the Partner Organisations 2014.

Shi C.,Fuzhou University | Li Z.,Fuzhou University | Chen F.,Fuzhou University
Nonlinear Analysis: Real World Applications | Year: 2012

In this paper, we propose a LotkaVolterra competitive system with infinite delay and feedback controls. By using the method of multiple Lyapunov functionals and by developing a new analysis technique, we establish the sufficient conditions which guarantee that some of the n species are driven to extinction. Two examples together with their numerical simulations show the feasibility of our main results and the considerable effects of feedback controls on the extinction of species. © 2012 Elsevier Ltd. All rights reserved.

Huang J.,Fuzhou University | Huang J.,Putian University | Ho W.,The Hong Kong Institute of Education | Wang X.,Fuzhou University
Chemical Communications | Year: 2014

Covalent carbon nitride polymers were applied as metal-free robust catalysts for the inactivation of Escherichia coli K-12 (E. coli), a common Gram-negative bacterium, under visible light illumination. The results demonstrated that the creation of antibacterial function on the surface of conjugated polymers has now become possible. © 2014 the Partner Organisations.

Chen J.-X.,Fuzhou University | Lin S.-W.,Fuzhou University | He B.-W.,Fuzhou University
International Journal of Machine Tools and Manufacture | Year: 2014

In this paper, comprehensive geometric errors, including linkage errors and volumetric errors, of a rotary table are measured totally by employing a double ballbar and obtained by a two-step identification procedure. The derivations of the center of the ball installed on the table are measured in the error sensitive directions with newly developed serial of two axes controlled circular paths. Hence, there are nine results measured from three mounting positions of the ball at the same rotation angle. These results are used to form the identification model based on the homogeneous transformation. Moreover, a sensitivity analysis method is applied to select the optimum installation parameters of the ballbar to diminish the influence of the inaccuracy of the measurement parameters. As the mounting position errors of the socket on the table are inevitable during the installation of the balls, a new correction procedure is developed as well. Finally, an experiment is conducted on the four-axis machining center. The comparison results between the predicted errors and the measured results are shown to verify the proposed method. © 2013 Elsevier Ltd.

Xu L.,Fuzhou University | Qi A.,Fuzhou University
Bridge Construction | Year: 2014

To take the proper seismic isolation measures for the fixed piers of multi-span concrete continuous girder bridge is an effective way to improve the piers subjected to the action of seismic force. In this paper, a six-span concrete continuous girder bridge was cited as an example and by means of the finite element software ANSYS, two kinds of the seismic isolation systems of the friction pendulum bearings and seismic mitigation spherical bearings respectively arranged on the intermediate piers of the bridge were calculated and analyzed and the laws of influences of the two kinds of the systems on the seismic responses of the bridge were studied. The results of the study indicate that the two kinds of the systems can effectively reduce the internal forces and displacement of the piers in the longitudinal direction of the bridge. In comparison with the seismic resistant system, the force conditions of the seismic isolation system are more reasonable and in consideration of the vertical bearing capacity and resilient stiffness of the bearings, the friction pendulum bearings have obvious advantage and it is therefore proposed that the pendulum bearings should be selected for such type of the bridges where the seismic isolation measures are required to be taken.

Wu L.-J.,Fuzhou University | Wu L.-J.,University of Pavia | Casciati F.,University of Pavia | Casciati S.,University of Catania
Engineering Structures | Year: 2014

In the class of not-contact sensors, the techniques of vision-based displacement estimation enable one to gather dense global measurements of static deformation as well as of dynamic response. They are becoming more and more available thanks to the ongoing technology developments. In this work, a vision system, which takes advantage of fast-developing digital image processing and computer vision technologies and provides high sample rate, is implemented to monitor the 2D plane vibrations of a reduced scale frame mounted on a shaking table as available in a laboratory. The physical meanings of the camera parameters, the trade-off between the system resolution and the field-of-view, and the upper limitation of marker density are discussed. The scale factor approach, which is widely used to convert the image coordinates measured by a vision system in the unit of pixels into space coordinates, causes a poor repeatability of the experiment, an unstable experiment precision, and therefore a global poor flexibility. To overcome these problems, two calibrations approaches are introduced: registration and direct linear transformation. Based on the constructed vision-based displacement measurement system, several experiments are carried out to monitor the motion of a scale-reduced model on which dense markers are glued. The experiment results show that the proposed system can capture and successfully measure the motion of the laboratory model within the required frequency band. © 2013 Elsevier Ltd.

Li F.,Fuzhou University | Kou L.,Fuzhou University | Chen W.,Fuzhou University | Wu C.,Fuzhou University | Guo T.,Fuzhou University
NPG Asia Materials | Year: 2013

Derived from double-walled carbon nanotubes, graphene quantum dots (GQDs) with a uniform size distribution were prepared through solution chemistry. The GQDs in chlorobenzene exhibited bright blue emission upon UV excitation. The introduction of the GQDs into a bulk heterojunction polymer solar cell based on poly(3-hexylthiophene):(6,6)-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) resulted in a significant enhancement of the power conversion efficiency (PCE). The efficiency was further improved by adjusting the PCBM content in the active layer, reaching a maximum PCE of 5.24%. This ternary system based on blended P3HT:PCBM:GQDs represents a new method to enhance the efficiency of polymer solar cells. © 2013 Nature Publishing Group.

Chen Z.,Fuzhou University | Liu S.,Fuzhou University | Yang M.-Q.,Fuzhou University | Xu Y.-J.,Fuzhou University
ACS Applied Materials and Interfaces | Year: 2013

We report the self-assembly of uniform CdS nanospheres/graphene (CdS NSPs/GR) hybrid nanocomposites via electrostatic interaction of positively charged CdS nanospheres (CdS NSPs) with negatively charged graphene oxide (GO), followed by GO reduction via a hydrothermal treatment. During this facile two-step wet chemistry process, reduced graphene oxide (RGO, also called GR) and the intimate interfacial contact between CdS NSPs and the GR sheets are achieved. Importantly, the CdS NSPs/GR nanocomposites exhibit a much higher photocatalytic performance than bare CdS NSPs toward selective reduction of nitro organics to corresponding amino organics under visible light irradiation. The superior photocatalytic performance of the CdS NSPs/GR nanocomposites can be attributed to the intimate interfacial contact between CdS NSPs and the GR sheets, which would maximize the excellent electron conductivity and mobility of GR that in turn markedly contributes to improving the fate and transfer of photogenerated charge carriers from CdS NSPs under visible light irradiation. Moreover, the photocorrosion of CdS and the photodegradation of GR can be efficiently inhibited. The excellent reusability of the CdS NSPs/GR nanocomposites can be attributed to the synergetic effect of the introduction of GR into the matrix of CdS NSPs and the addition of ammonium formate as quencher for photogenerated holes. It is hoped that our current work could promote us to efficiently harness such a simple and efficient self-assembly strategy to synthesize GR-based semiconductor composites with controlled morphology and, more significantly, widen the application of CdS/GR nanocomposite photocatalysts and offer new inroads into exploration and utilization of GR-based semiconductor nanocomposites as visible light photocatalysts for selective organic transformations. © 2013 American Chemical Society.

Jin X.-H.,University of Chinese Academy of Sciences | Sun J.-K.,University of Chinese Academy of Sciences | Xu X.-M.,Fuzhou University | Li Z.-H.,Fuzhou University | Zhang J.,University of Chinese Academy of Sciences
Chemical Communications | Year: 2010

Two Mn(ii) coordination complexes with considerable difference in photochromism and chirality have been constructed from the photoactive 1-(4-carboxybenzyl)-4,4′-bipyridinium ligand upon adjusting the reaction solvents. © 2010 The Royal Society of Chemistry.

Shen L.,Fuzhou University | Liang S.,Fuzhou University | Wu W.,Fuzhou University | Liang R.,Fuzhou University | And 2 more authors.
Dalton Transactions | Year: 2013

Metal-organic frameworks (MOFs) have been arousing a great interest owing to their unique physicochemical properties. In this work, Zr- benzenedicarboxylate (UiO-66) and its derivative, Zr-2-NH2- benzenedicarboxylate (UiO-66(NH2)), are successfully prepared via a facile solvothermal method and applied to photocatalytic reactions. Powder X-ray diffraction (XRD) confirms the isoreticular nature of UiO-66 and UiO-66(NH 2), while Fourier transformed infrared spectra (FTIR) prove the effective presence of amino group. UV-vis diffuse reflectance spectra (DRS) show the photoabsorption edge of UiO-66 could be shifted to the visible light region by simply introducing the amino group (-NH2) on the organic ligand. Importantly, UiO-66(NH2) is proved to perform as an efficient multifunctional visible-light-driven photocatalyst with high stability and considerable recyclability in both the photocatalytic selective oxidation of alcohols to aldehydes using molecular oxygen as oxidant and catalytic reduction of aqueous Cr(vi) to Cr(iii) under ambient conditions. Furthermore, the possible reaction mechanism has also been investigated in detail. This work makes a systematic attempt to understand the reaction of photocatalytic selective oxidation of alcohols over MOFs and represents the first example to report the identification of MOFs as promising visible-light photocatalysts toward reduction of aqueous Cr(vi). More significantly, our finding also provides a new way to design MOFs-based photocatalysts, that is, by tuning the predesigned ligands with specific functional groups, the optical absorption properties of MOFs can be flexibly modulated, and then the effective solar energy conversion can be expected. © 2013 The Royal Society of Chemistry.

Zhang N.,Fuzhou University | Yang M.-Q.,Fuzhou University | Tang Z.-R.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Catalysis | Year: 2013

A series of CdS-graphene (GR) nanocomposites with different weight addition ratios of GR have been fabricated via a facile one-step solvothermal approach. CdS-GR nanocomposites are proven to serve as selective visible light photocatalysts toward aerobic selective oxidation of alcohols and reduction of heavy ions Cr(VI), instead of being nonselective in water. Furthermore, we find that decreasing the defect density of GR by using the solvent-exfoliated graphene (SEG) instead of graphene oxide (GO) as the precursor of GR can efficiently enhance the photocatalytic activity of CdS-GR nanocomposites due to its improved electron conductivity as compared to reduced GO (RGO). In addition, the hybridization of CdS with GR (RGO, SEG) via an intimate interfacial interaction can also effectively inhibit the photocorrosion of CdS during the photocatalytic redox reaction. It is hoped that this work can draw attention to making better use of graphene to synthesize more efficient GR-based nanocomposite photocatalysts for solar energy conversion, especially in the field of diverse redox processes in water in the framework of green chemistry.© 2013 Elsevier Inc. All rights reserved.

Gu Q.,Fuzhou University | Long J.,Fuzhou University | Fan L.,Fuzhou University | Chen L.,Fuzhou University | And 3 more authors.
Journal of Catalysis | Year: 2013

This work offers an engineering guide to obtaining highly efficient photocatalysts for hydrogen production. Synergetic enhancement of photocatalytic hydrogen evolution from biomass/water solution is achieved by co-modifying anatase TiO2 with single-site Sn-oxo species and RuO2 nanoparticles. Detailed characterization and analysis clearly reveal that such TiO2-based composites can function as photoelectrolysis cells, where RuO2 and SnOx species serve, respectively, as an anode and a cathode and TiO2 is mainly responsible for the conversion of photons into electrical energy and the OH formation. Electron paramagnetic resonance and infrared spectroscopy studies suggest a free radical reaction pathway triggered by the hole oxidation for the photocatalytic reforming of biomass. The CxHyOz renewables undergo one or more processes for the sequential oxidation of alcohol to aldehyde, acid, and finally CO2 and CO. The activity results indicate that proton reduction is the controlling-rate step of the overall photoreforming reaction.© 2013 Elsevier Inc. All rights reserved.

Lin B.,Fuzhou University | Wei K.,Fuzhou University | Ni J.,Fuzhou University | Lin J.,Fuzhou University
ChemCatChem | Year: 2013

Carbon supports with a low ratio of micropore volume to total pore volume can be prepared by KOH activation of thermally modified carbon. KOH treatment of carbons in nitrogen led to the creation of basic sites as well as acidic surface groups, whereas KOH treatment in air resulted in more acidic groups. Steam treatment quickly increased the surface area and pore volume, but did not create surface-reactive groups. The increase in surface areas, micropores, and surface functional groups of carbon supports led to a decrease of the particle sizes, which not only improved the ability of hydrogen to migrate from Ru metal to the remote promoter precursors, but also increased the amount of adsorbed hydrogen and nitrogen. The properties of carbon combined with the size of the Ru particles affected the ammonia-synthesis activity. © 2013 WILEY-VCH Verlag GmbH & Co.

Yang Y.,Fuzhou University
Journal of Computer and System Sciences | Year: 2014

This paper proposes an efficient broadcast encryption scheme for key distribution in MANET. No message exchange is required to establish a group key. The communication overhead remains unchanged as group size grows. In order for the group member to obtain session key, only one bilinear pairing computation is required. The proposal is also evaluated through efficiency, security analysis and comparison with other existing schemes. We test the efficiency of the scheme on a modern station through simulation. The performance analysis shows its suitability for large scale MANETs. It is shown that the new scheme is provable secure in standard model. The comparison indicates that this scheme has efficiency surpassing congeneric schemes. Furthermore, an improved scheme against chosen ciphertext attack (CCA) is proposed in order to enhance the security. Thus, the proposal in this paper can not only meet security demands but is also efficient in terms of computation and communication. © 2013 Elsevier Inc.

Wang X.,Fuzhou University | Zheng Y.,Fuzhou University | Lin J.,Fuzhou University
Catalysis Communications | Year: 2013

A series of Mn-Ce mixed-oxide catalysts supported on carbon nanotubes (CNTs) were prepared for the first time and used for the selective catalytic reduction of NO with NH3. Mn(0.4)-Ce/CNTs catalysts with loading from 0.6% to 1.8% (molar ratio) in our tests showed more than 90% NO conversion at 120-180 C at a high space velocity of 42,000 h- 1. Transmission electron microscopy confirmed that the particle size of Mn-Ce mixed oxides supported on CNTs was 2 to 4 nm. BET result indicated Mn-Ce mixed-oxide catalysts obtained enlarged surface area and pore volume which was beneficial to the catalytic activity. © 2013 Elsevier B.V.

Chen Z.,Fuzhou University | Xu Y.-J.,Fuzhou University
ACS Applied Materials and Interfaces | Year: 2013

Development of various strategies for controllable fabrication of core-shell nanocomposites (CSNs) with highly active photocatalytic performance has been attracting ever-increasing research attention. In particular, control of the ultrathin layer TiO2 shell in constructing CSNs in an aqueous phase is a significant but technologically challenging issue. Here, this paper demonstrates the interface assembly synthesis of CdS nanospheres@TiO2 core-shell photocatalyst via the electrostatic interaction of negatively charged water-stable titania precursor with positively charged CdS nanospheres (CdS NSPs), followed by the formation of the ultrathin-layer TiO2 shell through a facile refluxing process in aqueous phase. The as-formed CdS NSPs@TiO2 core-shell nanohybrid exhibits a high visible-light-driven photoactivity for selective transformation and reduction of heavy metal ions. The ultrathin TiO2 layer coated on CdS NSPs results in excellent light transmission property, enhanced adsorption capacity, and improved transfer of charge carriers and lifespan of photoinduced electron-hole pairs, which would prominently contribute to the significant photoactivity enhancement. It is anticipated that this facile aqueous-phase synthesis strategy could be extended to design a variety of more efficient CSN photocatalysts with controllable morphology toward target applications in diverse photoredox processes. © 2013 American Chemical Society.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

The Toffoli gate, which has practical applications in the implementation of practical quantum algorithms and quantum error correction, is usually constructed from concatenated two-qubit or qubit-qutrit gates. Here we show that the Toffoli gate for three qubits can be implemented through a single XY interaction plus two single-qubit rotations. This method greatly simplifies the experimental implementation of the Toffoli gate and promises a much higher fidelity compared to those based on elementary gate decomposition. We present an example for the implementation of the required XY interaction in cavity QED. © 2013 American Physical Society.

Maeda K.,Tokyo Institute of Technology | Kuriki R.,Tokyo Institute of Technology | Zhang M.,Fuzhou University | Wang X.,Fuzhou University | Ishitani O.,Tokyo Institute of Technology
Journal of Materials Chemistry A | Year: 2014

Carbon nitride (C3N4) polymers work as a vital component in a photocatalytic CO2 reduction assembly that operates under visible light when modified with a ruthenium complex, trans(Cl)-[Ru{4, 4′-(CH2PO3H2)2-2,2′- bipyridine}(CO)2Cl2], (Ru) as a catalyst. Here we examined the effects of structural properties of carbon nitride on the photocatalytic performance for CO2 reduction into formic acid. Introduction of mesoporosity into the graphitic carbon nitride structure increased the specific surface area, leading to significant enhancement in activity. However, higher surface area (in other words, lower crystallinity) that originated from excessively introduced mesopores had a negative impact on activity, although it is a prerequisite to allow for adsorption of Ru on the carbon nitride surface. Thus, the activity was sensitive to specific surface area and crystallinity of carbon nitride, but is largely insensitive to the pore size and the volume. © the Partner Organisations 2014.

Yao H.,Fuzhou University | Zhong S.,Fuzhou University | Zhong S.,Fujian Key Laboratory of Medical Instrument and Pharmaceutical Technology
Optics Express | Year: 2014

We report terahertz surface plasmon resonance (SPR) sensing based on prism-coupling to the spoof surface plasmon polariton (SSPP) mode existing on periodically grooved metal films. It was demonstrated that, except for the fundamental mode of the SSPP, there was also a higher mode SSPP wave when the depth of groove was larger. Both fundamental and high-order modes of SSPP could be used for terahertz sensing. We compared the performance of different modes of SSPP on the sensing sensitivity using both reflection amplitude and phase-jump information. The results indicated that the gap distance between the prism base and the metal film had a significant influence on the reflectivity of SPR sensing by affecting the coupling efficiency of an evanescent wave to an SSPP wave; also, high-order mode SSPP-based sensing had a high sensitivity of up to 2.27 THz/RIU, which nearly doubled the sensitivity of the fundamental mode. The application of high-mode SSPP has enormous potential for ultra-sensitive SPR sensing in the terahertz regime. © 2014 Optical Society of America.

Zhang Y.,Fuzhou University | Tang Z.-R.,Fuzhou University | Fu X.,Fuzhou University | Xu Y.-J.,Fuzhou University
ACS Nano | Year: 2011

Increasing interest has been devoted to synthesizing graphene (GR)-semiconductor nanocomposites as photocatalysts for potential applications, which is very similar to its forebear carbon nanotube (CNT)-semiconductor photocatalysts. Unfortunately, a thoughtful and inevitable comparison between GR- and CNT-semiconductors as photocatalysts is often neglected in literature. This situation may give incomplete or exaggerated information on the contribution role of GR to enhance the semiconductor photocatalytic activity, as compared to CNT. Thus, our knowledge regarding the specific advantage of GR over CNT on how to design more efficient GR-semiconductor nanocomposites and understanding the origin of their enhanced photocatalytic performance is far from satisfactory. By taking the TiO2 semiconductor as an example, we conceptually demonstrate how to synthesize a more efficient GR-TiO2 nanocomposite as a visible light photocatalyst toward selective oxidation of alcohols under mild conditions. Comparison between GR-TiO2 and CNT-TiO2 discloses the prominent advantage of GR over CNT on both controlling the morphology of GR-TiO2 nanocomposite and enhancing the photocatalytic activity of TiO2. This work clearly highlights the importance and necessity for a comparison investigation between GR- and CNT-semiconductors as photocatalysts, which will promote our in-depth fundamental understanding on the analogy and difference between GR and CNT on controlling the morphology of GR (or CNT)-semiconductor nanocomposites and enhancing the photocatalytic performance. Therefore, we appeal the photocatalysis community to pay attention to this respect rather than separately imposing hype on the miracle of GR in much the same way as its carbon forebears, which could significantly advance our rational fabrication of smart GR-semiconductor nanocomposites for artificial photosynthesis. © 2011 American Chemical Society.

Pang Y.,Fuzhou University | Chen X.,Fuzhou University | Xu C.,Fuzhou University | Lei Y.,Fuzhou University | Wei K.,Fuzhou University
ChemCatChem | Year: 2014

MoO3-Bi2SiO5/SiO2 catalysts with a Mo/Bi molar ratio of 5, prepared by a two-step hydrothermal and simple impregnation method, were investigated for the epoxidation of propylene by O2 and characterized by XRD, N2 absorption-desorption isotherms, thermogravimetric analysis (TGA), temperature-programmed reduction, NH3 temperature-programmed desorption (TPD), and IR, Raman, and X-ray photoelectron spectroscopy (XPS). On MoO3-Bi2SiO 5/SiO2 with Mo/Bi=5 calcined at 723K, a propylene conversion of 21.99 % and a propylene oxide selectivity of 55.14 % were obtained at 0.15MPa, 673K, and flow rates of C3H6/O 2/N2=1/4/20cm3 min-1. XRD, IR spectroscopy, and XPS results show that Bi2SiO5 and MoO3 are crystalline nanoparticles. NH3-TPD results indicate that the surface acid sites are necessary for the high catalytic activity. The results of TGA and N2 absorption-desorption isotherms reveal that a reasonable calcination temperature is 723K. The reaction mechanism of propylene epoxidation on MoO3-Bi2SiO 5/SiO2 catalysis is hypothesized to involve an allylic radical generated at the molybdenum oxide species and the activation of O 2 at the bismuth oxide cations. A new sensation in epoxidation: We describe the probable synergistic effects of MoO3 and Bi 2SiO5 in propylene epoxidation. The reactive centers consist of nanoparticulate species of crystalline MoO3 to activate the propylene and bismuth oxide cluster cations to activate O2. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhang J.,Fuzhou University | Zhang M.,Fuzhou University | Lin S.,Fuzhou University | Fu X.,Fuzhou University | Wang X.,Fuzhou University
Journal of Catalysis | Year: 2014

Molecular doping of conjugated carbon nitride (CN) with thiophene donors was applied for the modification of CN photocatalysts. The incorporation of electron-rich thiophene entities in the conjugated polymer matrix can effectively change the intrinsic bulk and surface features of CN, such as engineering the electronic structure with tunable bandgap and promoting the charge-carrier migration and separation via forming surface dyadic structures. A significant alteration in the texture, morphology, and crystalline was also observed for the thiophene-modified CN samples. The combined benefits of the molecular doping in terms of bulk, surface, and texture properties lead to an improvement in the photocatalytic activity for H2 generation with visible light, which underlines the importance of organic chemistry protocols for the chemical modification of newly developed metal-free, polymeric photocatalysts. © 2013 Elsevier Inc. All rights reserved.

Dong Y.,Fuzhou University | Wang R.,Fuzhou University | Tian W.,Fuzhou University | Chi Y.,Fuzhou University | Chen G.,Fuzhou University
RSC Advances | Year: 2014

A simple, sensitive, rapid fluorescence (FL) sensor has been developed to detect cyanide ions (CN-) based on the branched polyethylenimine- capped carbon quantum dots (BPEI-GQDs). The amino groups at the surfaces of BPEI-GQDs can selectively and sensitively capture copper ions (Cu2+) to form absorbent cupric amine, which can quench the FL of BPEI-GQDs through an inner filter effect. CN- can combine strongly with Cu2+ to [Cu(CN)x]n- species, preventing Cu2+ from being captured by the amino groups of BPEI-GQDs. As a result, Cu2+ can't quench the FL of BPEI-GQDs anymore in the presence of CN-. In other words, CN- can "turn on" the FL signal of BPEI-GQDs/Cu2+ system, producing a "recovered" FL signal. After optimizing experimental conditions, we demonstrated that this easy methodology could offer a sensitive, selective, simple and rapid method for detection of CN- with a detection limit of 0.65 μM (S/N = 3) and a linear response range of 2 to 200 μM. © 2013 The Royal Society of Chemistry.

Lu C.-H.,Fuzhou University | Li J.,Fuzhou University | Lin M.-H.,Fuzhou University | Wang Y.-W.,Fuzhou University | And 3 more authors.
Angewandte Chemie - International Edition | Year: 2010

Turn up the volume: In a simple and highly sensitive aptamer-based assay that relies on the ability of nanomaterials to protect DNA from nuclease cleavage, the aptamer is released from the nanomaterial when challenged with a target. The nuclease then cleaves the free aptamer and releases the target, which can initiate a new cycle. Recycling of the target in this way leads to significant signal amplification (see diagram). © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Weng B.,Fuzhou University | Liu S.,Fuzhou University | Zhang N.,Fuzhou University | Tang Z.-R.,Fuzhou University | Xu Y.-J.,Fuzhou University
Journal of Catalysis | Year: 2014

One-dimensional CdS nanowires-carbon nanotubes nanocomposites (1D-1D CdS NWs-CNT NCs) with different weight addition ratios of CNT have been synthesized by a very simple room temperature self-assembly method, which is afforded by electrostatic attractive interaction between positively charged CdS NWs and negatively charged CNT in an aqueous solution. Importantly, the CdS NWs-CNT NCs exhibit remarkably enhanced photoactivity toward selective reduction of aromatic nitro organics in water under visible light irradiation as compared to bare CdS NWs. The significantly enhanced photoactivity is attributed to the integrated factors of the unique 1D-1D morphology associated with CdS NWs and CNT, the efficient retardation of recombination of the photoexcited electron-hole pairs, and the enhanced visible light absorption intensity. Besides, the CdS NWs-CNT NCs exhibit higher photoactivity than CdS NWs-reduced graphene oxide (CdS NWs-RGO NCs), toward selective reduction of aromatic nitro organics. Therefore, this work not only offers a very simple room temperature approach to synthesize highly efficient 1D semiconductor-1D CNT composite photocatalyst, but also gives an example that RGO cannot readily manifest its unique and prominent advantage over CNT for specific photocatalytic application, thus underpinning the importance of rationally utilizing the carbon materials (e.g., 1D CNT, 2D RGO) to design more efficient carbon-semiconductor composite photocatalyst. © 2013 Elsevier Inc. All rights reserved.

Zheng X.,Fuzhou University | Chen Z.,Fuzhou University
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

Under the Jaynes-Cummings model, the evolution of nonclassical properties of two cavity modes is discussed, such as squeezing, sub-Poissonian statistics and violations of Cauchy-Schwarz inequalities and Bell inequalities are discussed. The two cavity modes are initially in pair coherent states, each mode interacts with two two-level atoms resonantly. Numerical simulation results show that some nonclassical properties can be enhanced after resonant interaction between the atoms and the cavity and the performance of a selective atomic measurement. Moreover, after atom-cavity interaction, a resonant classical microwave field is applied to the atoms, which performs a unitary transformation on the atomic states, a selective measurement is performed to the atoms after selecting transform parameters the two-mode squeezing can be somehow enhanced.

Li S.-H.,Fuzhou University | Gao S.-K.,Fuzhou University | Liu S.-X.,Fuzhou University | Guo Y.-N.,Fuzhou University
Crystal Growth and Design | Year: 2010

Two vanillin derivatives, 4-hydroxy-3-methoxybenzaldehyde nicotinoylhydrazone (L1) and 4-hydroxy-3-methoxybenzaldehyde salicyloylhydrazone (L2), were synthesized. The two flexible ligands have been employed to assemble with Pb(II), Cu(II), or Co(II) ion, leading to the formation of five coordination polymers varying from zero- to three-dimensional structures. Complex [Pb2(L1) 2(NO3)2]·3H2O (1) features a novel 3D diamond-like coordination network based on binuclear units as binodes and hydrazone ligands, L1, as linkers. However, complex Pb 2(L1)2(OAc)2(H2O) 2 (2) presents a ID doublestrand chain structure. Two factors, the second ligand (acid ligand) and different coordination ability of water molecules, are investigated to further explore its relationship with the resultant crystalline architectures in complexes 1 and 2. The donor atoms in the two lead(II) complexes 1 and 2 can cluster to one side leaving an "open" coordination site to accommodate the stereochemically active 6s2 lone pair. Complex Cu(L2)2 (3) shows a ID double-strand chain structure. There is an extended onedimensional structure in complex [Co3-(L2)2(C5H 5N)2] · ClO4 (4), while [Co 2+(L2)2(C5H5N) 2]·2CH3OH·H2O (5) displays a discrete structure. © 2009 American Chemical Society.

Chen F.,Fuzhou University
Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering | Year: 2016

We explore a method to enhance the tensile strength of cement-soil by adding basalt fiber into the soil and conduct splitting tensile tests on the mixture with different proportions of basalt fiber to inspect the tensile strength and different failure modes. We establish the relationship between the tensile strength and the unconfined compression strength of cement-soil with different mixture ratios of basalt fiber. The results show that the addition of basalt fiber can effectively improve the tensile strength of cement-soil specimens at different ages and strengthen the plastic characteristics of cement-soil. However with the increase of fiber content, the enhancement effect on tensile strength is gradually weakened. Too much fiber content is incapable of bringing obvious strength enhancement. The basalt fiber cement-soil specimens give rise to a certain plasticity when they are damaged, thus improving the project stability. These results may provide reference for engineering practices. © 2016, Editorial Office of Journal of Shenzhen University. All right reserved.

Zhao J.,Fuzhou University
Progress in Chemistry | Year: 2015

The complicated reverse aggregates of surfactants in non-polar organic solvents are reviewed. So far, most of reverse wormlike micelles and reverse vesicles are formed by lecithin and only a few by some derivatives or sodium bis(2-ethylhexyl) sulfosuccinate (AOT). All these amphiphilies are soluble in non-polar organic solvents. Suitable molecular packing geometry is always required for the construction of reverse wormlike micelles or reverse vesicles. The new method developed by Raghavan group to prepare organic solutions made single inorganic salts possible as effective conditioning agents to improve the molecular packing geometry, which progresses the study of reverse wormlike micelles. Some suggestions are made so as to expand the investigations about the complicated reverse aggregates of surfactants in non-polar organic solvents, which include the role of water added, the preparing methods, the surfactant dissolution upon the aggregate formation, and the improvement of surfactant molecular geometry, etc. ©, 2015, Chinese Academy of Sciences. All right reserved.

Zhang J.,Fuzhou University | Wang X.,Fuzhou University
Angewandte Chemie - International Edition | Year: 2015

Overall water splitting with a semiconductor photocatalyst under visible-light irradiation is considered as a "dream reaction" in chemistry. The development of a 600 nm photocatalyst for solar water splitting highlighted here is not only an important milestone towards sustainable hydrogen production, but also a new starting point for artificial photosynthesis. STH=solar-to-hydrogen energy conversion efficiency. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Lin X.,Fuzhou University | Weng Z.,Fuzhou University
Dalton Transactions | Year: 2015

Fluoroorganic compounds have attracted significant attention in various fields, such as pharmaceutical, agricultural chemistry, and materials science, as a result of their unique physical, chemical, and physiological properties. Consequently, extensive efforts have been devoted to the site-specific synthesis of organofluorine compounds. In recent years, transition-metal-mediated C-F bond formation has emerged as a powerful method for fabrication of these compounds. this Perspective mainly focuses on the most recent advances in transition-metal-assisted synthesis of alkyl fluorides. © The Royal Society of Chemistry 2015.

Huang J.,Fuzhou University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

Based on the piezoelectric principle, in consideration of adhesion, interaction between asperities, elastic-plastic deformation of the substrate, microcantilever elastic recovery and so on, the dynamic characteristics between microcantilever and the substrate rough surface driven by piezoelectric were simulated by using ABAQUS finite element software. The results showed that there were several significant contact-separation cases during the contact process of each piezoelectric driving. When no voltage was applied for 2~4 μs, bonding between beam and the substrate still appeared. A small portion of the elastic-plastic deformation on the rough surface occurred during separation, and the maximum residual stress appeared at the edge of the contact area. With the increase of piezoelectric driving times, the effect of surface bonding enhanced and the plastic deformation region on the substrate rough surface extended to two sides continuously, which influenced the reliability of the contact system. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved.

Lin Z.,Fuzhou University | Chen L.,Fuzhou University | Zhu X.,Fuzhou University | Qiu B.,Fuzhou University | Chen G.,Fuzhou University
Chemical Communications | Year: 2010

A highly sensitive and selective electrochemiluminescence biosensor for detection of thrombin based on the strategy of target-induced conjunction of split aptamer fragments was developed. © The Royal Society of Chemistry 2010.

Zhu X.,Fuzhou University | Chen L.,Fuzhou University | Lin Z.,Fuzhou University | Qiu B.,Fuzhou University | Chen G.,Fuzhou University
Chemical Communications | Year: 2010

A highly sensitive and selective electrochemiluminescent biosensor was designed for mercury(ii) based on T-Hg 2+-T complex by using Ru(bpy) 3 2+-doped silica nanoparticles (Ru-SNPs) to label the oligonucleotides in order to improve the sensitivity. © The Royal Society of Chemistry 2010.

Guo L.,Nanyang Technological University | Chen G.,Fuzhou University | Kim D.-H.,Nanyang Technological University
Analytical Chemistry | Year: 2010

Three-dimensional gold nanoarchitecture was fabricated by layer-by-layer (LbL) deposition of gold nanoparticles (AuNPs) and multiwalled carbon nanotubes (MWCNTs) on a glass substrate for a highly sensitive plasmonic biosensor using a conventional UV-vis instrument. Carboxyl-functionalized MWCNTs were reacted with 3-mercaptopropyltriethoxysilane (MPTES) to introduce multiple thiol groups onto MWCNTs. A self-assembled monolayer (SAM) of AuNPs on a glass chip was sequentially dipped into MPTES-functionalized MWCNTs (MWCNT-Si-SH) and AuNPs to form multilayers of AuNPs on MWCNTs. Such three-dimensionally assembled AuNPs provided a large surface area and multiple binding sites within a few steps of modification and microporous structures of multilayered MWCNTs to allow a high accessibility of target molecules. It was shown that the bulk refractive index (RI) sensitivity of these multilayered AuNPs (three-dimensional chip) appeared to be 5.6 times better than that of a monolayer of AuNPs on a glass chip (two-dimensional chip). The three-dimensional chips were further used for a biomolecular binding study, showing a detection limit as low as 0.5 nM for streptavidin and 3.33 nM for anti-human serum albumin (HSA), both of which were ∼20 times higher than the sensitivity of the two-dimensional chips. © 2010 American Chemical Society.

Liu S.,Fuzhou University | Tang Z.-R.,Fuzhou University | Sun Y.,Argonne National Laboratory | Colmenares J.C.,Polish Academy of Sciences | Xu Y.-J.,Fuzhou University
Chemical Society Reviews | Year: 2015

The severe consequences of fossil fuel consumption have resulted in a need for alternative sustainable sources of energy. Conversion and storage of solar energy via a renewable method, such as photocatalysis, holds great promise as such an alternative. One-dimensional (1D) nanostructures have gained attention in solar energy conversion because they have a long axis to absorb incident sunlight yet a short radial distance for separation of photogenerated charge carriers. In particular, well-ordered spatially high dimensional architectures based on 1D nanostructures with well-defined facets or anisotropic shapes offer an exciting opportunity for bridging the gap between 1D nanostructures and the micro and macro world, providing a platform for integration of nanostructures on a larger and more manageable scale into high-performance solar energy conversion applications. In this review, we focus on the progress of photocatalytic solar energy conversion over controlled one-dimension-based spatially ordered architecture hybrids. Assembly and classification of these novel architectures are summarized, and we discuss the opportunity and future direction of integration of 1D materials into high-dimensional, spatially organized architectures, with a perspective toward improved collective performance in various artificial photoredox applications. This journal is © The Royal Society of Chemistry.

Lian T.-T.,Fuzhou University | Chen S.-M.,Fuzhou University | Chen S.-M.,CAS Fujian Institute of Research on the Structure of Matter
Inorganic Chemistry Communications | Year: 2012

A new microporous Cu(II)-isonicotinate framework Cu(int) 2•DMF(1, int = isonicotinate; DMF = N,N-dimethylformamide) with large open channels filled by guest DMF molecules has been solvothermally synthesized and structurally characterized. It features a typical bcu topology by reducing the dinuclear Cu units as the 8-connected nodes. Such bcu-type framework is much stable after removal of the guest DMF molecules and shows notable CO 2 sorption behavior. © 2012 Elsevier B.V. All rights reserved.

Wu L.,Fuzhou University | Wu L.,University of Pavia | Casciati F.,University of Pavia
Structural Control and Health Monitoring | Year: 2014

Structural monitoring and structural health monitoring could take advantage from different devices to record the static or dynamic response of a structure. A positioning system provides displacement information on the location of moving objects, which is assumed to be the basic support to calibrate any structural mechanics model. The global positioning system could provide satisfactory accuracy in absolute displacement measurements. But the requirements of an open area position for the antennas and a roofed room for its data storage and power supply limit its flexibility and its applications. Several efforts are done to extend its field of application. The alternative is local positioning system. Non-contact sensors can be easily installed on existing infrastructure in different locations without changing their properties: several technological approaches have been exploited: laser-based, radar-based, vision-based, etc. In this paper, a number of existing options, together with their performances, are reviewed. Copyright © 2014 John Wiley & Sons, Ltd. Copyright © 2014 John Wiley & Sons, Ltd.

Zhang Z.,Fuzhou University | Wang X.,Fuzhou University | Long J.,Fuzhou University | Gu Q.,Fuzhou University | And 2 more authors.
Journal of Catalysis | Year: 2010

This paper focuses on the photoactive centers of nitrogen-doped TiO 2 visible light photocatalyst. A series of N-doped TiO2 materials were prepared by a post-nitridation route at the temperature range of 400-800 °C. The photocatalytic oxidation of acetone as a model reaction was used to evaluate the photocatalytic properties of the materials. The chemical states of doped nitrogen species were characterized by near-edge X-ray absorption fine structure, X-ray photoelectron, and electron paramagnetic resonance spectroscopies. The results reveal that four types of N species exist alone or together in TiO2 depending on nitridation temperature. The photoactive centers of the materials are a diamagnetic [O-Ti4+-N 3--Ti4+-V0-] cluster containing an oxygen vacancy and a nitrogen anion. The visible light photocatalysis of N-doped TiO2 is proposed to be initiated by an excited state of the surface [Ti 4+-N3-] unit. © 2010 Elsevier Inc. All rights reserved.

Fang H.,Fuzhou University
Applied Mechanics and Materials | Year: 2014

Although Non-continuous OFDM (NC-OFDM) has the unique advantage of eliminating interference to authorized user in cognitive radio context, it also confronts a difficulty of reducing peak to average power ratio (PAPR) like other OFDM techniques. In this paper, carrier interferometry is proposed to apply in NC-OFDM system in order to reduce its PAPR using the construction feature of CI code itself. The coding principle of CI code is analyzed at first. Then NC-OFDM base-band system based on carrier interferometry (CI/NC-OFDM) is modeled. Theoretical analysis and matlab simulation results indicate that CI code can bring 3 dB lower PAPR reference with the same probability of exceeding some PAPR reference, compared with traditional NC-OFDM system. This method is effective and feasible and gets better BER performance as well. © (2014) Trans Tech Publications, Switzerland.

Zhang N.,Fuzhou University | Ciriminna R.,CNR Institute of Nanostructured Materials | Pagliaro M.,CNR Institute of Nanostructured Materials | Xu Y.-J.,Fuzhou University
Chemical Society Reviews | Year: 2014

Low cost and easily made bismuth tungstate (Bi2WO6) could be one of the key technologies to make chemicals and fuels from biomass, atmospheric carbon dioxide and water at low cost using solar radiation as an energy source. Its narrow band gap (2.8 eV) enables ideal visible light (λ > 400 nm) absorption. Yet, it is the material's shape, namely the superstructure morphology wisely created via a nanochemistry approach, which leads to better electron-hole separation and much higher photoactivity. Recent results coupled to the versatile photochemistry of this readily available semiconductor suggest that the practical application of nanochemistry-derived Bi2WO6 nanostructures for the synthesis of value-added fine chemicals and fuel production is possible. We describe progress in this important field of chemical research from a nanochemistry viewpoint, and identify opportunities for further progress. This journal is © the Partner Organisations 2014.

Yang M.-Q.,Fuzhou University | Zhang N.,Fuzhou University | Pagliaro M.,CNR Institute of Nanostructured Materials | Xu Y.-J.,Fuzhou University
Chemical Society Reviews | Year: 2014

Tremendous interest is devoted to fabricating numerous graphene (GR)-semiconductor composites toward improved conversion of solar energy, resulting from the observation that the photogenerated electrons from semiconductors (e.g., TiO2, CdS) can be readily accepted or shuttled in the two-dimensional (2D) GR sheet. Yet although the hunt is on for GR-semiconductor composite based photoredox applications that aim to exploit the remarkable electronic conductivity of GR, the work necessary to find out how it could best be harnessed to improve the photocatalytic performance of semiconductors remains scanty. In this review, we highlight a few problems associated with improving the photocatalytic performance of semiconductors via methodological coupling with GR. In particular, we address strategies for harnessing the structure and electronic conductivity of GR via strengthening the interfacial contact, optimizing the electronic conductivity of GR, and spatially optimizing the interfacial charge carrier transfer efficiency. Additionally, we provide a brief overview of assembly methods for fabricating GR-semiconductor composites with controllable film infrastructure to meet the requirements of practical photocatalytic applications. Finally, we propose that, only with the principle of designing and understanding GR-semiconductor composites from a system-level consideration, we might get better at imparting the power of GR with unique and transformative properties into the composite system. © The Royal Society of Chemistry 2014.

Lin Z.,Fuzhou University | Wang X.,Fuzhou University
ChemSusChem | Year: 2014

To allow for simultaneous textural engineering and doping of carbon nitride materials with heteroatoms, urea has been polymerized with an ionic liquid. The role of urea is to create a delamination effect during carbon nitride synthesis, whereas ionic liquid functions as texture modifier as well as B/F dopant source. This will result in the rational fabrication of boron- and fluorine-containing 2D carbon nitride nanosheets with enhanced optical harvesting and charge separation capabilities for hydrogen evolution catalysis using visible light. We believe that the innovative modification strategy developed herein can be coupled with the already known modification tools of 2D carbon nitride, thus further developing a new family of light-harvesting 2D platforms for the efficient and sustained utilization of solar radiation for a variety of advanced applications, including CO2 photofixation, organic photosynthesis, and pollutant controls. BuILd your own semi: Simultaneous nanoarchitectual engineering and doping of a robust carbon nitride semiconductor has been demonstrated by a direct co-condensation of urea and an ionic liquid (e.g., [Bmim][BF4]), yielding boron- and fluorine-containing two-dimensional carbon nitride nanosheets with enhanced optical harvesting and charge separation capabilities for hydrogen evolution catalysis with visible light. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xu Z.,Fuzhou University
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011 | Year: 2011

In the integrated circuit routing, we often consider the routing for some special nets under the restrictions, such as equidistance and symmetry. The symmetrical routing is operated between the routing for the bus and the clock and the routing for most the others without the priority. We prove that the symmetrical routing problem under the H-V model is equivalent to finding a Steiner free of the corresponding vertices for all of the pins in the valid connected graph. We put forward an algorithm for the symmetrical routing under the H-V model. In the actual wiring process, when the symmetrical routing is needed, the routing is finished by hand. This paper provides a method and the theory based on graphs for the automation design of the symmetrical routing. © 2011 IEEE.

Han C.,Fuzhou University | Zhang N.,Fuzhou University | Xu Y.-J.,Fuzhou University
Nano Today | Year: 2016

Recent years have seen the rocket rise of graphene as the unique two-dimensional carbon nanosheets and its outstanding promise in materials science. In particular, because of its diverse, tunable structural and electronic properties, graphene has been well recognized to be an ideal co-catalyst to optimize the photocatalytic performance of semiconductors. Given that the conductive, optical, chemical and mechanical performances of graphene are closely linked to its structural diversity, tremendous efforts have been devoted to designing and tailoring the graphene nanosheets to construct the desirable architecture. The tailored graphene materials (GMs), such as zero-dimensional graphene quantum dots, one-dimensional graphene nanoribbons and three-dimensional graphene frameworks show a variety of fascinating features, thereby offering a fertile and flexible ground for the further development of GMs-enhanced photocatalysis. This review aims to provide an overview on the structural diversity, tunable properties, and synthetic strategies of these GMs, followed by highlighting their multi-functionality in heterogeneous photocatalysis. Finally, the perspectives on future research trends and challenges in constructing more efficient GMs-enhanced systems for solar energy conversion are presented. The integral comprehension of GMs with all dimensions would further guide the fundamental processing-structure-properties-applications relationships of GMs. © 2016 Elsevier Ltd

Liu W.,Fuzhou University | Wang Y.,Fuzhou University | Li Z.,Fuzhou University
Chemical Communications | Year: 2014

RGO-based aerogels with varied and controllable surface wettability were fabricated using different amino acids. Hydrophobic cys-RGO aerogels prepared by l-cysteine exhibited an outstanding adsorption toward oils and organic solvents, while hydrophilic lys-RGO aerogels obtained from l-lysine can be used as adsorbents for heavy metal ions in water. This journal is © the Partner Organisations 2014.

Zhang G.,Fuzhou University | Wang X.,Fuzhou University
Journal of Catalysis | Year: 2013

Phenylurea has been integrated into the traditional polymerization route of carbon nitride (CN) precursors (e.g., urea, thiourea, dicyandiamide, and ammonium thiocyanide) in a facile one-pot approach, to modify the chemical composition, electronic structure, and catalytic performance of graphitic CN (g-CN). Results revealed that the co-polymerization of phenylurea with urea dramatically modifies the optical and electronic properties of g-CN, leading to a remarkable improvement by a factor of 9 in the photocatalytic activity of g-CN (when coupled with Pt as a co-catalyst) in an assay of hydrogen evolution reaction, while still keeping a high catalytic stability during pre-longed operations. The active catalyst is eventually a hybrid organocatalyst that is a heterogeneous Pt catalyst supported on a urea-based polymer. The promotional effect of phenylurea as the co-monomer for urea on the activity and stability of Pt/g-CN could be related to the extension of delocalized π-conjugated system of CN heterocycles, as a result of the fusion of phenyl motifs in the CN framework. The thus created surface dyadic structure favors the separation and migration of charge-carriers photoexcited upon light illumination. This work highlights a wide accessibility of chemical protocols for the design and synthesis of functional CN photocatalysts at molecular levels by applying suitable CN precursors and co-monomers. © 2013 Elsevier Inc. All rights reserved.

Lin B.,Fuzhou University | Wei K.,Fuzhou University
Catalysis Communications | Year: 2013

The electronegativity of Li is much higher than that of Na or K, but the ammonia synthesis activities of Li-promoted Ru/AC catalysts were comparable to the values of Ru catalyst promoted with K, which were much higher than those over Ru catalyst with Na promoter. The presence of Li increased the catalytic activity by changing the chemisorption properties such as hydrogen adsorption and nitrogen adsorption for carbon-supported Ru catalysts, rather than affecting the sizes of Ru particles or the electron density of Ru metal. © 2013 Elsevier B.V.

Wu H.,Fuzhou University | Yang Z.-B.,Fuzhou University | Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We study the dynamics of a system composed of two coupled cavities, each interacting with a single Rydberg atom. The interplay between Rydberg-Rydberg interaction and photon hopping enables the transition of the atoms from the collective ground state to the double Rydberg excitation state by individually interacting with the optical normal modes and suppressing the upconversion process between them. The atomic transition is accompanied by the two-photon absorption and emission of the normal modes. Since the energy level structure of the atom-cavity system is photon number dependent there is only a pair of states being in the two-photon resonance. Therefore, the system can act as a quantum nonlinear absorption filter through the nonclassical quantum process, converting coherent light field into a nonclassical state. Meanwhile, the vacuum field in the cavity inspires the Rydberg atoms to simultaneously emit two photons into the normal mode, resulting in obvious emission enhancement of the mode. © 2013 American Physical Society.

Shen L.-T.,Fuzhou University | Yang Z.-B.,Fuzhou University | Chen R.-X.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We study the Rabi model composed of three qubits coupled to a harmonic oscillator without involving the rotating-wave approximation. We show that the ground state of the three-qubit Rabi model can be analytically treated by using the transformation method, and the transformed ground state agrees well with the exactly numerical simulation under a wide range of qubit-oscillator coupling strengths for different detunings. We use the pairwise entanglement to characterize the ground-state entanglement between any two qubits and show that it has an approximately quadratic dependence on the qubit-oscillator coupling strength. Interestingly, we find that there is no qubit-qubit entanglement for the ground state if the qubit-oscillator coupling strength is large enough. © 2013 American Physical Society.

Xia Y.,Fuzhou University
ICALIP 2012 - 2012 International Conference on Audio, Language and Image Processing, Proceedings | Year: 2012

This paper proposes a fast speech enhancement algorithm for the removal of noise from single-channel speech signal, based on a novel noise constrained least-squares (NCLS) method. Parameters of speech signal modeled as autoregressive process are well estimated by the NCLS method and thus the speech signal can be recovered from Kalman filtering. Simulation results show that the proposed NCLS estimation-based algorithm has a much faster speed than the generalized least absolute deviation estimation-based algorithm and possesses good speech enhancement performance than the Kalman filtering algorithms based on the conventional second-order estimation and the high-order estimation. © 2012 IEEE.

Zhou Z.-Y.,Anhui University of Science and Technology | Ding D.-S.,Anhui University of Science and Technology | Jiang Y.-K.,Fuzhou University | Li Y.,Anhui University of Science and Technology | And 3 more authors.
Optics Express | Year: 2014

Light with helical phase structures, carrying quantized orbital angular momentum (OAM), has many applications in both classical and quantum optics, such as high-capacity optical communications and quantum information processing. Frequency conversion is a basic technique to expand the frequency range of the fundamental light. The frequency conversion of OAM-carrying light gives rise to new physics and applications such as up-conversion detection of images and generation of high dimensional OAM entanglements. Quasi-phase matching (QPM) nonlinear crystals are good candidates for frequency conversion, particularly due to their high-valued effective nonlinear coefficients and no walk-off effect. Here we report the first experimental second-harmonic generation (SHG) of an OAM-carried light with a QPM crystal, where a UV light with OAM of 100 h is generated. OAM conservation is verified using a specially designed interferometer. With a pump beam carrying an OAM superposition of opposite sign, we observe interesting interference phenomena in the SHG light; specifically, a photonics gear-like structure is obtained that gives direct evidence of OAM conservation, which will be very useful for ultra-sensitive angular measurements. Besides, we also develop a theory to reveal the underlying physics of the phenomena. The methods and theoretical analysis shown here are also applicable to other frequency conversion processes, such as sum frequency generation and difference-frequency generation, and may also be generalized to the quantum regime for single photons. © 2014 Optical Society of America.

Liu X.,Fuzhou University | Sun D.,Fuzhou University | Yuan R.,Fuzhou University | Fu X.,Fuzhou University | Li Z.,Fuzhou University
Journal of Catalysis | Year: 2013

Hybrid systems built by coupling CdS with a series of Ru carbonyl complexes ([Ru(bpy)2(CO)2](PF6)2 (RC-1), [Ru(phen)2(CO)2](PF6)2 (RC-2), [Ru(bpy)(CO)2Cl2] (RC-3), [Ru(Me2bpy)(CO) 2Cl2] (RC-4), and [Ru(phen)(CO)2Cl2] (RC-5)) showed activity for the hydrogenation of carbonyl compounds under visible-light irradiations in the presence of appropriate sacrificial agent. The influences of the irradiations mode, sacrificial agent, substrates, and the structure of the Ru complexes on the hydrogenation performance of these composites were investigated. Results indicated that CdS act as the photosensitizer, while the Ru carbonyl complexes as catalytic active component. This study provides some guidance in the development of feasible hybrid photocatalytic systems encompassing visible-light-responsive semiconductors and redox-active transition metal complexes, which are expected to find great potentials in the photocatalytic organic transformations. It is believed that such photocatalytic systems can be built in a more controllable way based on our understanding on the structure-activity relationship of the molecular electro-catalyst. © 2013 Elsevier Inc. All rights reserved.