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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.

Chen F.,Anhui University of Finance and Economics | Fan G.,Fuzhou University
Journal of Combinatorial Theory. Series B | Year: 2016

A spanning subgraph F of a graph G is called an even factor of G if each vertex of F has even degree at least 2 in F. Kouider and Favaron proved that if a graph G has an even factor, then it has an even factor F with |E(F)|≥916(|E(G)|+1). In this paper we improve the coefficient 916 to 47, which is best possible. Furthermore, we characterize all the extremal graphs, showing that if |E(H)|≤47(|E(G)|+1) for every even factor H of G, then G belongs to a specified class of graphs. © 2016 Elsevier Inc.

Liu T.,IUAV University of Venice | Zordan T.,Tongji University | Briseghella B.,Fuzhou University | Zhang Q.,Tongji University
Engineering Structures | Year: 2014

Equivalent linearization of seismic isolation systems is often recommended in modern structural specifications for the purpose of simplification. In this paper, limited conditions specified in equivalent linearization of seismic isolation system are investigated when subjected to seismic loads. A large number of numerical simulations, including both approximate linear and exact nonlinear analyses, are performed using a program specially developed by MATLAB in conjunction with OpenSees. Approximate to exact maximum displacement ratio averaged over seven earthquake ground motions is selected as the evaluation indicator. Results reveal that, although satisfactory estimates can be obtained if the limited conditions are met, the application scope of equivalent linearization of seismic isolation system is significantly restricted. To improve the prediction accuracy of equivalent linear analysis in a wider parameter space, equivalent linear model recommended in codes is modified through introducing a factor, which is related to ductility ratio, post-to-pre yield stiffness ratio and initial period of seismic isolation system. It is demonstrated that the newly proposed equivalent linear model yields more accurate results when compared with other equivalent linear models. © 2014 Elsevier Ltd.

Fu G.-S.,Fuzhou University | Chen G.-Q.,Fujian Engineering College
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

Isothermal and constant strain rate compression tests of 3003 aluminum alloy prepared by high-efficient melt-treatment were conducted in the range of 300-500°C and 0.01-10.0 s-1 on a Gleeble-1500 thermal simulator. The processing map was created based on the dynamic materials model (DMM). Combined with the hot deformation microstructure observation by OM and TEM, the hot deformation mechanism map of the 3003 aluminum alloy was established. The results show that the flow instable zones can be determined by the maps and the analysis of the microstructure, which are corresponding to hot deformation temperature of 300-380°C and strain rate around 1.0-10.0 s-1. The optimal hot processing parameters of hot deformation under the test condition are obtained by the maps as follows: hot deformation temperature of 380-430°C and strain rate around 1.0-10.0 s-1, where the material mainly under goes dynamic recrystallization (DRX).

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.

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.

Jiang F.,Fuzhou University | Jiang S.,CAS Beijing Institute of Applied Physics And Computational Mathematics | Wang D.,University of Pittsburgh
Archive for Rational Mechanics and Analysis | Year: 2014

We consider weak solutions to a simplified Ericksen–Leslie system of two-dimensional compressible flow of nematic liquid crystals. An initial-boundary value problem is first studied in a bounded domain. By developing new techniques and estimates to overcome the difficulties induced by the supercritical nonlinearity (Formula Presented) in the equations of angular momentum on the direction field, and adapting the standard three-level approximation scheme and the weak convergence arguments for the compressible Navier–Stokes equations, we establish the global existence of weak solutions under a restriction imposed on the initial energy including the case of small initial energy. Then the Cauchy problem with large initial data is investigated, and we prove the global existence of large weak solutions by using the domain expansion technique and the rigidity theorem, provided that the second component of initial data of the direction field satisfies some geometric angle condition. © 2014, Springer-Verlag Berlin Heidelberg.

Li D.-F.,Fuzhou University | Li D.-F.,Dalian Naval Academy
Expert Systems with Applications | Year: 2010

Fuzziness is inherent in decision data and decision making process. In this paper, interval-valued intuitionistic fuzzy (IVIF) sets are used to capture fuzziness in multiattribute decision making (MADM) problems. The purpose of this paper is to develop a methodology for solving MADM problems with both ratings of alternatives on attributes and weights being expressed with IVIF sets. In this methodology, a weighted absolute distance between IF sets is defined using weights of IF sets. Based on the concept of the relative closeness coefficients, we construct a pair of nonlinear fractional programming models which can be transformed into two simpler auxiliary linear programming models being used to calculate the relative closeness coefficient intervals of alternatives to the IVIF positive ideal solution, which can be employed to generate ranking order of alternatives based on the concept of likelihood of interval numbers. The proposed method is illustrated with a real example. © 2010 Elsevier Ltd. All rights reserved.

He Z.,Fuzhou University
Lecture Notes in Electrical Engineering | Year: 2013

Evolutionary K-Means (EKM) is a non-parametric approach proposed to improve K-Means algorithm. Current EKM approaches are ineffective in deciding the correct cluster number of real datasets. This paper uses instance-level constraints to solve this problem and presents a Constrained Silhouette (CS) based algorithm, namely CS-EAC. Firstly CS is defined to combine constraints into the computation of Silhouette Information (SI). Updated from the Fast Evolutionary Algorithm for Clustering algorithm (F-EAC), CS-EAC uses CS instead of SI to guide the genetic operations. Experimental results suggest that CS-EAC is effective in both deciding the correct number of clusters and improving the accuracy of clustering for real datasets. © 2013 Springer-Verlag.

The fast urban expansion has led to replacement of natural vegetation-dominated land surfaces by various impervious materials. This has a significant impact on the environment due to modification of heat energy balance. Timely understanding of spatiotemporal information of impervious surface has become more urgent as conventional methods for estimating impervious surface are very limited. In response to this need, this paper proposes a new index, normalized difference impervious surface index (NDISI), for estimating impervious surface. The application of the index to the Landsat ETM+ image of Fuzhou City and the ASTER image of Xiamen City in China has shown that the new index can efficiently enhance and extract impervious surfaces from satellite imagery, and the normalized NDISI can represent the real percentage of impervious surface. The index was further used as an indicator to investigate the impact of impervious surface on urban heat environment by examination of its quantitative relationship with land surface temperature (LST), vegetation, and water using multivariate statistical analysis. The result reveals that impervious surface has a positive exponential relationship with LST rather than a simple linear one. This suggests that the areas with high percent impervious surface will accelerate LST rise and urban heat island development. © 2010 American Society for Photogrammetry and Remote Sensing.

Lin Y.,Fuzhou University
Zhen ci yan jiu = Acupuncture research / [Zhongguo yi xue ke xue yuan Yi xue qing bao yan jiu suo bian ji] | Year: 2013

Researches on the specificity of acupoints need a contrast of non-acupoint. However, there have been no uniform standards for locating the non-acupoint in both human body and animals. In the present paper, the authors make a review about the methods for locating the non-acupoint in rats during acupuncture experiments in recent decade. Till now, four methods were frequently used, i.e., 1) selecting a spot beside the known acupoint at the same level, 2) selecting the mid point between two meridian running courses, 3) choosing a spot at the tail, and 4) choosing a spot below the costal region. The authors hold that of the 4 methods, the last one, i.e., taking the spot below the costal region as the non-acupoint is probably the most reasonable approach, if it is far from the observed acupoint, and on the same or the adjacent spinal nerve segment.

Yu Z.-W.,Northwestern Polytechnical University | Yu Z.-Y.,Fuzhou University | Zhou X.-S.,Northwestern Polytechnical University
Jisuanji Xuebao/Chinese Journal of Computers | Year: 2012

The advances of pervasive computing technologies significantly enhance the capabilities for data capture. Using the sensing data to understand human behavior, mobility, and activity, and ultimately help to solve social problems is a great challenge in the information era. This paper introduces a new emerging research topic in computer science-Socially Aware Computing. The new paradigm aims at leveraging the large-scale diverse sensing devices deployed in human daily lives to recognize individual behaviors, discover group interaction patterns, and support community communication and collaboration. The paper discusses the concept, origin, model, and research topics of Socially Aware Computing. It also reviews the current stage of the field in five aspects: system and application, data sensing, behavior and interaction analysis, social theory and law verification, and social interaction support.

Zhang W.-B.,Fuzhou University
Renewable and Sustainable Energy Reviews | Year: 2012

Biodiesel is primarily obtained from the base catalyzed transesterification reaction of oils or fats. Biodiesel has become more attractive due to its characteristics of being bio-degradable, renewable and non-toxic. Recently biodiesel has been widely used as an alternative fuel. Biodiesel quality analysis has become very important because consistency and a higher quality are paramount to the success of its commercialization and market acceptance. Suitable and precise analytical methods are needed to meet this requirement. Some analytical techniques have been considered and applied in biodiesel analysis, such as Chromatography and Spectroscopy. Within the Spectroscopic technique, Infrared Spectroscopy has played an important role. Past reviews on analytical methods for biodiesel analysis were written by Knothe and Marcos Roberto Monteiro. In this paper, the author has discussed the developments in biodiesel quality analysis with IR technique. © 2012 Elsevier Ltd.

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.

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.

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.

Zhang C.,Fuzhou University
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2013

In this paper, the multi-tower suspension bridge as taken as research object. Based on energy principles, the Rayleigh method is used to derive simplified formulas of primary vertical frequencies, whose modes are anti-symmetric and symmetrical vertical bending vibration. During derivation processing, some secondary effects of suspension bridge frequency factors are ignored. The accuracy of proposed formulas in this paper is verified by comparisons between the formulas and the finite element approach for a project. These formulas proposed in this paper can be used to calculate primary vertical frequencies for this kind of bridge.

Zheng Y.,Fuzhou University | Sanche L.,Universite de Sherbrooke
Journal of Chemical Physics | Year: 2010

We report the results of a study on the influence of organic salts on the induction of single strand breaks (SSBs) and double strand breaks (DSBs) in DNA by electrons of 1 eV to 60 keV. Plasmid DNA films are prepared with two different concentrations of organic salts, by varying the amount of the TE buffer (Tris-HCl and EDTA) in the films with ratio of 1:1 and 6:1 Tris ions to DNA nucleotide. The films are bombarded with electrons of 1, 10, 100, and 60 000 eV under vacuum. The damage to the 3197 base-pair plasmid is analyzed ex vacuo by agarose gel electrophoresis. The highest yields are reached at 100 eV and the lowest ones at 60 keV. The ratios of SSB to DSB are surprisingly low at 10 eV (∼4.3) at both salt concentrations, and comparable to the ratios measured with 100 eV electrons. At all characteristic electron energies, the yields of SSB and DSB are found to be higher for the DNA having the lowest salt concentration. However, the organic salts are more efficient at protecting DNA against the damage induced by 1 and 10 eV electrons. DNA damage and protection by organic ions are discussed in terms of mechanisms operative at each electron energy. It is suggested that these ions create additional electric fields within the groove of DNA, which modify the resonance parameter of 1 and 10 eV electrons, namely, by reducing the electron capture cross-section of basic DNA units and the lifetime of corresponding transient anions. An interstrand electron transfer mechanism is proposed to explain the low ratios for the yields of SSB to those of DSB produced by 10 eV electrons. © 2010 American Institute of Physics.

Zheng Y.-Y.,Fuzhou University
Gongneng Cailiao/Journal of Functional Materials | Year: 2015

2-(6-oxido-6Hdiben-(c, e)(1, 2)-oxaphosphorin-6-yl)-1, 4-bis(5', 5'-dimethyl-1, 4-dioxaphosphorinanyl-2-oxy) benzene (DPPOBQ), a novel halogen-free flame retardant with phosphaphenanthrene group, was synthesized via phospous oxychloride, neopentyl glycol, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 1, 4-benzoquinone by a three step reaction. And the structure of DPPOBQ was characterized and studied by mass spectrometry (MS), elementary analysis, fourier transform infrared spectra (FT-IR), 1H and 31P nuclear magnetic resonance spectrum (1H-NMR, 31P-NMR), respectively. Then the flame retardance in EVA foam composites was discussed. The results of TG-Mass show that the flame retardant has a high thermal stability and excellent char-forming ability. The 5% weight loss temperature of title compound was above 260.2℃ and the char yield was about 19.1% at 1000℃. ©, 2015, Journal of Functional Materials. All right reserved.

Chen E.-X.,CAS Fujian Institute of Research on the Structure of Matter | Chen E.-X.,Fuzhou University | Yang H.,CAS Fujian Institute of Research on the Structure of Matter | Zhang J.,CAS Fujian Institute of Research on the Structure of Matter
Inorganic Chemistry | Year: 2014

Traditional semiconducting metal oxide-based gas sensors are always limited on low surface areas and high operating temperatures. Considering the high surface area and high stability of zeolitic imidazolate framework (ZIF), ZIF-67 (surface area of 1832.2 m2 g-1) was first employed as a promising formaldehyde gas sensor at a low operating temperature (150 °C), and the gas sensor could detect formaldehyde as low as 5 ppm. This work develops a new promising application approach for porous metal-organic frameworks. © 2014 American Chemical Society.

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

Performance assessment often has to be conducted under uncertainty. This paper proposes a "fuzzy expected value approach" for data envelopment analysis (DEA) in which fuzzy inputs and fuzzy outputs are first weighted, respectively, and their expected values then used to measure the optimistic and pessimistic efficiencies of decision making units (DMUs) in fuzzy environments. The two efficiencies are finally geometrically averaged for the purposes of ranking and identifying the best performing DMU. The proposed fuzzy expected value approach and its resultant models are illustrated with three numerical examples, including the selection of a flexible manufacturing system (FMS). © 2011 Elsevier Ltd. All rights reserved.

Chen Y.,Fuzhou University | Zhang Y.,South China University of Technology | Meng Q.,South China University of Technology
Energy and Buildings | Year: 2012

Ventilation cooling technology (VCT) has been widely used for the notable energy saving, low first costs and conveniences for application in China in recent years. A new control strategy of VCT was provided to guarantee the indoor air temperature and humidity environment and maximize the energy saving. A simulation evaluation method for the energy saving of VCT which can be used for the different types of telecommunication base stations (TBS) under different meteorological conditions was proposed. The relations between each influencing factor and the annual saved energy were analyzed. And the application strategy of VCT was concluded as follows: the higher internal heat and the lower energy efficiency ratio of air conditionings, the more obvious energy savings would be achieved. VCT is not applicable when the internal heat is lower than a certain value and is more applicable in the hotter regions. The high temperature set point of air conditionings should be raised and the fan power should be reduced. The air change rate should be decided with the internal heat. The lowest internal heat of TBS for applying VCT and the highest annual saved energy of VCT for all types of TBSs was also provided. © 2012 Elsevier B.V. All rights reserved.

Wu X.,Fuzhou University
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2011

In order to implement high-accuracy self-localization, kidnapping and tracking of soccer robots during the matches among medium-sized teams, a self-localization method based on the improved genetic algorithm is proposed. In this method, first, a mathematical model of genetic algorithm is established, in which the minimum sum of the white line points in the image and the corresponding points in the model map is used to evaluate the target function. Then, based on the global self-localization of the genetic algorithm, the gradient optimum algorithm is used to partially modify the major pose for the purpose of improving the self-localization precision and the algorithm robustness. Finally, with regard to the kidnapping and tracking of the robot, the author points out that the error of the distance between the observation points and the actual points should accord with the Gaussian distribution for the purpose of updating the population status and realizing the tracking of robot, and that, when the individual adaption degree of population sharply declines, the dynamic self-adaptive tuning of mutation probability helps to reduce the population deficiency effect and realize the recovered self-localization of kidnapping. Simulated and experimental results indicate that the proposed self-localization method is superior to those based on the traditional genetic algorithm and on the Monte Carlo algorithm, with its average self-localization tracking error being (0.046 m, 0.22°).

He Z.,Fuzhou University
Soft Computing | Year: 2016

K-Means users usually have to decide on the number of clusters and the initial state by themselves. Evolutionary K-Means (EKM), a hybrid algorithm of K-Means and genetic algorithm, solves the problem by choosing the two parameters automatically through partition evolution; however, the final partition obtained often doesn’t meet users’ expectations. As a solution to this problem, we suggest using background knowledge for enhancing clustering quality and propose a semi-supervised approach that incorporates instance level constraints into the objective function of EKM. Firstly, we define Constrained Silhouette Index (CS) for data instances, which decreases the silhouette index of the instance having violated constraints. Then, we present two weighted approaches to extend the influence of constraints beyond the level of instance for evaluating the quality of a cluster or a partition. To evaluate the performance of CS in guiding EKM algorithms, we combine the two types of CS with F-EAC algorithm, and get two constrained EKM algorithms, which are named as CEAC1 and CEAC2, respectively. Experimental results on two artificial datasets and eight UCI datasets suggest a few constraints are often powerful enough to improve the accuracy of labelling instances and choosing K, and more constraints may improve the performance even more. © 2014, Springer-Verlag Berlin Heidelberg.

Wan S.-P.,Jiangxi University of Finance and Economics | Li D.-F.,Fuzhou University
IEEE Transactions on Fuzzy Systems | Year: 2014

The aim of this paper is to develop a new Atanassov's intuitionistic fuzzy (A-IF) programming method to solve heterogeneous multiattribute group decision-making problems with A-IF truth degrees in which there are several types of attribute values such as A-IF sets (A-IFSs), trapezoidal fuzzy numbers, intervals, and real numbers. In this method, preference relations in comparisons of alternatives with hesitancy degrees are expressed by A-IFSs. Hereby, A-IF group consistency and inconsistency indices are defined on the basis of preference relations between alternatives. To estimate the fuzzy ideal solution (IS) and weights, a new A-IF programming model is constructed on the concept that the A-IF group inconsistency index should be minimized and must be not larger than the A-IF group consistency index by some fixed A-IFS. An effective method is developed to solve the new derived model. The distances of the alternatives to the fuzzy IS are calculated to determine their ranking order. Moreover, some generalizations or specializations of the derived model are discussed. Applicability of the proposed methodology is illustrated with a real supplier selection example. © 1993-2012 IEEE.

Jianben L.,Fuzhou University
Journal of Convergence Information Technology | Year: 2012

One major problem in information retrieval is term mismatch between queries and documents, this paper proposes query analysis and refinement algorithm for information retrieval. It extracts related terms from web based corpuses, then it finds additional query term candidates by calculating the degrees of importance of relevant terms, at last, both the terms are used to retrieval. This algorithm can improve the results of search. Experimental result shows that the proposed algorithm is effective.

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.

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

Quality function deployment (QFD) is a planning tool used in new product development and quality management. It aims at achieving maximum customer satisfaction by listening to the voice of customers. To implement QFD, customer requirements (CRs) should be identified and assessed first. The current paper proposes a linear goal programming (LGP) approach to assess the relative importance weights of CRs. The LGP approach enables customers to express their preferences on the relative importance weights of CRs in their preferred or familiar formats, which may differ from one customer to another but have no need to be transformed into the same format, thus avoiding information loss or distortion. A numerical example is tested with the LGP approach to demonstrate its validity, effectiveness and potential applications in QFD practice. © 2011 Elsevier Inc. 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.

Tam V.W.Y.,University of Western Sydney | Wang Z.-B.,Fuzhou University | Wang Z.-B.,Tsinghua University | Tao Z.,University of Western Sydney
Materials and Structures/Materiaux et Constructions | Year: 2014

Past research indicates that recycled aggregate concrete (RAC) could be successfully used in concrete-filled steel tubular (CFST) columns. Their yielded performance is almost as good as that of the traditional CFST columns. In addition, as a comparatively new construction material, stainless steel can be used to replace carbon steel for enhancing the durability and ductility of CFST columns. With an aim to combine the advantages of both RAC and stainless steel, RAC is proposed in this paper to be used as a filling material for stainless steel tubes. A test program is introduced in this paper to investigate the behaviour of RAC-filled stainless steel stub columns. For comparison purposes, reference specimens with carbon steel tubes are also tested. In the end, finite element analysis is conducted to simulate the current test results and those reported in the literature. © 2013 RILEM.

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.

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.

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.

Yang C.-P.,Hangzhou Normal University | Yang C.-P.,East China Normal University | Su Q.-P.,Hangzhou Normal University | Zheng S.-B.,Fuzhou University | Han S.,University of Kansas
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We discuss how to generate entangled coherent states of four microwave resonators (a.k.a. cavities) coupled by a three-level superconducting device (qutrit). We also show that a Greenberger-Horne-Zeilinger (GHZ) state of four superconducting qubits embedded in four different resonators can be created with this scheme. In principle, the proposed method can be extended to create an entangled coherent state of n resonators and to prepare a (GHZ) state of n qubits distributed over n cavities in a quantum network. In addition, it is noted that four resonators coupled by a coupler qutrit may be used as a basic circuit block to build a two-dimensional quantum network, which is useful for scalable quantum information processing. © 2013 American Physical Society.

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.

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.

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.

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.

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.

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.

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.

We have developed an efficient self-assembly strategy to readily achieve well-defined Au/TNTs heterostructure based on robust as well as multilayered dendritic dithiolated diethylenetriaminepentaacetic (DTDTPA) ligand as bridging medium. Versatile catalytic performances of the hybrid system were investigated. © 2012 The Royal Society of Chemistry.

Wang H.,Donghua University | Zhang L.,Donghua University | Chen Z.,Donghua University | Hu J.,Donghua University | And 4 more authors.
Chemical Society Reviews | Year: 2014

Semiconductor-mediated photocatalysis has received tremendous attention as it holds great promise to address the worldwide energy and environmental issues. To overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts, many strategies have been developed in the past few decades and the most widely used one is to develop photocatalytic heterojunctions. This review attempts to summarize the recent progress in the rational design and fabrication of heterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductor-metal heterojunction, the semiconductor-carbon heterojunction and the multicomponent heterojunction. The photocatalytic properties of the four junction systems are also discussed in relation to the environmental and energy applications, such as degradation of pollutants, hydrogen generation and photocatalytic disinfection. This tutorial review ends with a summary and some perspectives on the challenges and new directions in this exciting and still emerging area of research. This journal is © the Partner Organisations 2014.

Zhao H.-J.,CAS Fujian Institute of Research on the Structure of Matter | Zhang Y.-F.,Fuzhou University | Chen L.,CAS Fujian Institute of Research on the Structure of Matter
Journal of the American Chemical Society | Year: 2012

A new chiral sulfide family, Ln 4InSbS 9 (Ln = La, Pr, Nd), with its own structure type in space group P4 12 12 or its enantiomorph P4 32 12 has been synthesized by solid-state reaction. Remarkably, the La member shows the strongest Kleinman-forbidden second harmonic generation to date, with an intensity 1.5 times that of commercial AgGaS 2 at a laser wavelength of 2.05 μm, and exhibits type-I phase-matchable behavior. Density functional theory calculations and ab initio molecular dynamics simulations suggest that lattice vibrations may be responsible for the origin and magnitude of the strong SHG effect. © 2012 American Chemical Society.

Zhang B.,Fuzhou University
Optics Communications | Year: 2010

In this paper, we investigate entanglement between two two-level atoms when they simultaneously interact with a single-mode thermal field in the strong-coupling regime. We show that a slight detuning between the atomic transition frequency and the field frequency might cause high entanglement between the atoms. More interestingly, if we choose the detuning appropriately, both atoms would somehow get entangled even when both atoms are initially in the excited state. © 2010 Elsevier B.V. All rights reserved.

Increasing interest has been devoted to preparing gold nanoparticle (GNP) functionalized TiO 2 nanotube array (TNTA) nanocomposites (GNP/TNTA) for photocatalytic applications. Nonetheless, achieving accurate control of surface assemblies of GNPs tethered on the TNTA substrate is far from satisfactory. Thus, in our work, applying 3-mercaptopropionic acid (MPA) as an interconnecting ligand, tailor-made monodispersed GNPs are evenly deposited on the interior and exterior surfaces of TNTAs with significant monodispersity via a self-assembly approach. The intrinsic self-assembly mechanism leading to the GNP/TNTA hybrid nanostructure is highlighted and ascertained. The photocatalytic performances of GNP/TNTAs are systematically evaluated in the photodegradation of organic dye pollutants under UV light irradiation. The ensemble of results indicates that the hierarchical nanostructure of the GNP/TNTA nanocomposite obtained via this self-assembly approach exhibits remarkably enhanced photocatalytic performance compared to its counterparts of P25 particulate film, a flat anodic TiO 2 layer (FTL), and GNP/FTL, in which well-dispersed GNPs and conducting titanium substrate are proposed to play crucial roles as efficient "electron traps" for the transfer of the photogenerated electrons and thus retard the recombination of photogenerated electron-hole pairs during the harvesting of photon-energy. In addition, the detection of increased amounts of highly active species (especially hydroxyl radicals) on the GNP/TNTAs by photoluminescence (PL) and electron spin resonance spectra (ESR) techniques further confirms the proposed mechanism. It is hoped that our knowledge regarding this simple self-assembly approach may cast new insight into the design and fabrication of noble-metal NPs/1-D nanotubular semiconductor hybrid nanomaterials for a wide range of photocatalytic applications. © 2012 The Royal Society of Chemistry.

Hydrothermal method synthesis of α-MnO2 nanowires has been achieved at different temperatures in this work. X-ray diffraction and transmission electron microscopy confirmed the pure phase of the α-MnO2 nanowires. All of the samples crystallized in a single-phase nanowires shape. The α-MnO2 nanowires diameter increased from 11 nm to 21 nm with the increase in hydrothermal temperature from 120 C to 200 C. The α-MnO2 catalytic activity on the decomposition of ammonium perchlorate (AP) was characterized through thermogravimetric analysis. The decomposition rate of AP with the addition of α-MnO2 was size relative. The 11 nm MnO2 nanowires exhibited the best catalytic activity, which lowered the high-temperature peak of AP by 130°C. © 2013 Elsevier Ltd. All rights reserved.

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.

Miao B.,Dalian Maritime University | Li T.,Dalian Maritime University | Luo W.,Fuzhou University
Neurocomputing | Year: 2013

In this paper, a novel adaptive neural network (NN) controller is proposed for trajectory tracking of autonomous underwater vehicle (AUV). By employing radial basic function neural network to account for modeling errors, then the adaptive NN tracking controller is constructed by combining the dynamic surface control (DSC) and the minimal learning parameter (MLP). The proposed controller guarantees that all the close-loop signals are uniform ultimate bounded (UUB) and that the tracking errors converge to a small neighborhood of the desired trajectory. Finally, simulation studies are given to illustrate the effectiveness of the proposed algorithm. © 2013 Elsevier B.V.

Liu Y.,CAS Fujian Institute of Research on the Structure of Matter | Lin J.,CAS Fujian Institute of Research on the Structure of Matter | Chen M.,Fuzhou University | Song L.,CAS Fujian Institute of Research on the Structure of Matter
Food and Chemical Toxicology | Year: 2013

Gentian violet (GV) is a well-known triarylmethane dye that is used in aquacultural, industrial and medicinal fields. But concerns in growing number have been paid to its potential health problems to human beings and its hazardous effects to environment. Herein, the toxic interaction of GV with bovine hemoglobin (BHb) was investigated by a series of spectroscopic methods and molecular modeling method. The fluorescence emission profile exhibited a remarkable quenching upon addition of GV to the buffered aqueous solution of BHb and the analysis of results revealed the dominant role of static quenching mechanism in GV-BHb interaction. The negative δH and positive δS values demonstrated that the electrostatic interactions mainly stabilized this toxicantprotein complex. Synchronous fluorescence, UV-Vis absorption and CD spectroscopic studies proved that the conformational change of BHb was induced by GV's combination. Molecular modeling studies exhibited the binding mode of GV-BHb complex and the detailed information of related driving forces. During the 1H nuclear magnetic resonance spectra (1H NMR) study, the chemical shift perturbation and spin-lattice relaxation times of different protons were further used to investigate the interaction of GV with BHb and the results indicated that GV bound orientationally to BHb. © 2013 Elsevier Ltd.

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.

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.

Li D.F.,Fuzhou University
Expert Systems with Applications | Year: 2010

The intuitionistic fuzzy (IF) set characterized by two functions was a generalization of the fuzzy set. In this paper, we investigate multiattribute decision making (MADM) problems with ratings of alternatives being expressed using IF sets and attribute weights given as real numbers. Firstly, the generalized ordered weighted averaging (GOWA) operators introduced by Yager [Yager, R. (2004). Generalized OWA aggregation operators. Fuzzy Optimization and Decision Making, 3, 93-107] are extended to aggregate IF sets. Secondly, MADM problems with IF sets are formulated through transforming the ratings of alternatives on both qualitative and quantitative attributes into IF sets in a unified way. The method and procedure based on the extended GOWA operators are developed to solve the MADM problems with IF sets. Finally, the effectiveness and practicability of the proposed method are illustrated with a numerical example. © 2010 Elsevier Ltd. All rights reserved.

Liu T.,IUAV University of Venice | Zordan T.,Tongji University | Briseghella B.,Fuzhou University | Zhang Q.,Tongji University
Engineering Structures | Year: 2014

Although peak response of seismic isolation systems can be obtained through nonlinear time history analysis method, approximate linear elastic analysis method is frequently proposed in recent structural codes to reduce the computational effort and to simplify the design procedure. Of the approximate methods, the equivalent linearization (EL) method is best known. In this study, fourteen EL methods proposed in the literatures are assessed based on single-degree-of-freedom (SDOF). systems with bilinear hysteretic behavior. A large number of numerical simulations are performed using a program developed by MATLAB in combination with OpenSees to evaluate the influence of ductility ratio and initial period on the accuracy of EL methods to estimate the maximum inelastic displacement of bilinear SDOF systems when subjected to 12 earthquake ground motions. A set of 20 ductility ratios ranging from 2 to 50 are considered, as well as 15 initial natural periods between 0.1. s and 1.5. s. Ratios of approximate to exact maximum displacement corresponding to each EL method are averaged over the considered ground motions, and the standard deviation of investigated ratios is also calculated to measure the degree of dispersion. Eventually, comments on the accuracy of different EL methods are given to make their applications more appropriate in practical design of base isolation systems. © 2013 Elsevier Ltd.

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

Yang F.,Fuzhou University | Tu C.,CAS Fujian Institute of Research on the Structure of Matter
Journal of Alloys and Compounds | Year: 2012

The single crystal ZnWO 4:Tm 3+ has been grown by Czochralski method. The XRD, refractive index, absorption and fluorescence spectra are measured. The Judd-Ofelt parameters Ω2, Ω4, Ω6 are obtained to be 6.3 × 10 -20, 1.3 × 10 -20, 1.4 × 10 -20 cm 2, respectively. The fluorescence decay time of the 3H 4 level is measured to be 0.113 ms and the quantum efficiency is 57%. The gain cross sections corresponding to 3F 4→ 3H 6 transition at ∼2 μm are estimated by the reciprocity method (RM). The strong gain at ∼2 μm indicates that the ZnWO 4:Tm 3+ crystal is a promising laser host for ∼2 μm laser. © 2012 Elsevier B.V. All rights reserved.

Ren Y.,CAS Fujian Institute of Research on the Structure of Matter | Ren Y.,Fuzhou University | You L.,CAS Fujian Institute of Research on the Structure of Matter
Journal of the American Chemical Society | Year: 2015

The research of systems chemistry exploring complex mixtures of interacting synthetic molecules has been burgeoning recently. Herein we demonstrate for the first time the coupling of molecular switches with a dynamic covalent reaction (DCR) and the modulation of created chemical cascades with a variety of inputs, thus closely mimicking a biological signaling system. A novel Michael type DCR of 10-methylacridinium perchlorate and monothiols exhibiting excellent regioselectivity and tunable affinity was discovered. A delicate balance between the unique reactivity of the reactant and the stability of the adduct leads to the generation of a strong acid in a thermodynamically controlled system. The dynamic cascade was next created via coupling of the DCR and a protonation-induced configurational switch (E/Z isomerization) through a proton relay. Detailed examination of the interdependence of the equilibrium enabled us to rationally optimize the cascade and also shed light on the possible intermediate of the switching process. Furthermore, relative independence of the coupled reactions was verified by the identification of stimuli that are able to facilitate one reaction but suppress the other. To further enhance systematic complexity, a second DCR of electrophilic aldehydes and thiols was employed for the reversible inhibition of the binary system, thus achieving the interplay of multiple equilibria. Finally, a fluorescence switch was turned on through coupling with the DCR, showcasing the versatility of our strategy. The results described herein should pave the way for the exploitation of multifunctional dynamic covalent cascades. © 2015 American Chemical Society.

Chen H.,University of Tennessee at Knoxville | Chen H.,Fuzhou University | Hsiao Y.-C.,University of Tennessee at Knoxville | Hu B.,University of Tennessee at Knoxville | And 2 more authors.
Advanced Functional Materials | Year: 2014

Low bandgap polymer (LBG):fullerene mixtures are some of the most promising organic photovoltaic active layers. Unfortunately, there are no post-deposition treatments available to rationally improve the morphology and performance of as-cast LBG:fullerene OPV active layers, where thermal annealing usually fails. Therefore, there is a glaring need to develop post-deposition methods to guide the morphology of LBG:fullerene bulk heterojunctions towards targeted structures and performance. In this paper, the structural evolution of PCPDTBT:PCBM mixtures with solvent annealing (SA) is examined, focusing on the effect of solvent quality of the fullerene and polymer in the annealing vapor on morphological evolution and device performance. The results indicate that exposure of this active layer to the solvent vapor controls the ordering of PCPDTBT and PCBM phase separation very effectively, presumably by inducing component mobility as the solvent plasticizes the mixture. These results also unexpectedly indicate that solvent annealing in a selective solvent provides a method to invert the morphology of the LBG:fullerene mixture from a polymer aggregate dispersed in a polymer:fullerene matrix to fullerene aggregates dispersed in a polymer:fullerene matrix. The judicious choice of solvent vapor, therefore, provides a unique method to exquisitely control and optimize the morphology of LBG conjugated polymer/fullerene mixtures. Solvent annealing in a selective solvent provides a method to invert the morphology of low bandgap polymer (LBG):fullerene mixtures from a polymer aggregate dispersed in a polymer:fullerene matrix to fullerene aggregates dispersed in a polymer:fullerene matrix. The judicious choice of solvent vapor provides a unique method to exquisitely control and optimize the morphology and performance of LBG:fullerene mixtures. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Lv Q.,Fuzhou University
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2011

Polypyrrole nanoparticles and polypyrrole-lignosulfonate composite hollow spheres were prepared by unstirred polymerization of pyrrole with FeCl3 as an oxidant. The morphologies and structures of the polypyrrole nanoparticles and polypyrrole-lignosulfonate composite hollow spheres were characterized with scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectra (FT-IR), and wide-angle X-ray diffractometry. It is found that the lignosulfonate content influences strongly on the morphology of the polypyrrole-lignosulfonate composites. Polypyrrole nanoparticles in mean diameters of 160 nm were prepared in deionized water at 25°C for 24 h in the absence of lignosulfonate. However, Polypyrrole-lignosulfonate composite hollow spheres in outer diameters of 180 nm~290 nm were obtained when the lignosulfonate content was up to 12.5%.

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.

Zheng S.B.,Fuzhou University
Science China: Physics, Mechanics and Astronomy | Year: 2012

We propose a scheme for implementation of a universal set of quantum logic gates in decoherence-free subspace with atoms trapped in distant cavities connected by optical fibers. The selective dispersive couplings between the ground states and the first-excited states of the atom-cavity-fiber system produce a state-dependent Stark shift, which can be used to implement nonlocal phase gates between two logic qubits. The single-logic-qubit quantum gates are achieved by the local two-atom collision and the Stark shift of a single atom. During all the logic operations, the logic qubits remain in decoherence-free subspace and thus the operation is immune to collective dephasing. © Science China Press and Springer-Verlag Berlin Heidelberg 2012.

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.

Su Y.,Fuzhou University | Huang J.,Chinese University of Hong Kong
IEEE Transactions on Automatic Control | Year: 2015

In this paper, we study the cooperative global robust output regulation problem for a class of lower triangular nonlinear uncertain multi-agent systems. We first introduce a type of distributed internal model to convert the cooperative global robust output regulation problem into a global robust stabilization problem of a so-called augmented multi-agent system which is in the block lower triangular form. We then further show that, under a set of standard assumptions, the augmented multi-agent system can be globally stabilized via a distributed state feedback control law by developing a block backstepping technique. A special case of the main result of this paper leads to the solution of the leader-following global robust consensus problem for a class of nonlinear uncertain multi-agent systems. © 1963-2012 IEEE.

Zhong Z.-R.,Fuzhou University
Optics Communications | Year: 2010

We present a scheme for realizing a multi-atom NOON state via cavity QED system. The scheme bases on the Jaynes-Cumming mode with collective atomic bosonic mode. In the process, a series of control atoms are sent through two single mode cavities which are initially in vacuum states and have the same collective atoms. After the suitable interaction time, the collective atoms in two cavities are in the desired state. © 2009 Elsevier B.V. All rights reserved.

Zhong Z.-R.,Fuzhou University
Optics Communications | Year: 2010

A scheme is proposed for the generation of entangled states for three atoms trapped in three distant cavities connected by two identical single-mode fibers. Compared to the previous scheme, the significant advantage of the proposed scheme is that each cavity can interact with the other two directly, which is significant in distributed quantum computation and quantum communication. © 2009 Elsevier B.V. All rights reserved.

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.

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.

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.

Yan M.,Fuzhou University
Metallurgical and Mining Industry | Year: 2015

Supply Chain Management (SCM) is a kind of management thought and method to enhance enterprise competitiveness widely valued by international academia and business circles at present. Agent has the characteristics of autonomy, interaction, initiative and reactiveness, which is more suitable for developing the SCM system than traditional software methods. On the basis of the research on the conceptual framework and operational reference model of SCM, four steps to construct SCM system model was proposed: the analysis of entities in SCM; the confirmation of processing flow; the design of business process Agent and business process unit framework; and the proposal of multi-agent SCM system model and task-based MAS model. In this paper, with collaborative SCM system as the research object, the supply chain was collaborated by using game theory and multi-agent collaborative thought, and the collaborative supply chain system was designed by adopting data warehouse and multi-agent technology, collaborative SCM system based on multi-agent was put forward. This enables personnel in the related nodes of the supply chain to obtain, store, share and respond to market information data conveniently and quickly and has practical guidance for the realistic collaborative SCM.

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.

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.

Liu Z.,Fuzhou University
Metallurgical and Mining Industry | Year: 2015

The current data mining is confronted with many problems in its application in medical quality and safety monitoring based on traditional BP neural network. This paper is aimed at proposing a scheme based on improved BP neural network while providing an analysis of issues concerning data mining based on improved BP neural network in medical quality supervision. For medical quality supervision, the use of improves BP neural network mining, not only improves the level of medical treatment regulation, resulting in medical claims expenses decreased by 8% and infectious disease infection rate decreased by 12%, but exerts positive effects in application as well. In general, in medical quality supervision, the application data mining based on improved BP neural network plays a positive role in two aspects: on the one hand, it can effectively dig out useful data and information; on the other hand, it can guarantee the quality of medical quality supervision.

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.

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 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.

Guo L.,Fuzhou University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

Let G = (V, E) be a given (directed) graph in which every edge is with a cost and a delay that are nonnegative. The k-disjoint restricted shortest path (kRSP) problem is to compute k (edge) disjoint minimum cost paths between two distinct vertices s, t ∈ V, such that the total delay of these paths are bounded by a given delay constraint D ∈ ℝ0 +. This problem is known to be NP-hard, even when k = 1 [4]. Approximation algorithms with bifactor ratio (1 + 1/r, r(1+2(log r+1)/r)(1+∈)) and (1+1/r, r(1+2(log r+1)/r)) have been developed for its special case when k = 2 respectively in [11] and [3]. For general k, an approximation algorithm with ratio (1, O(ln n)) has been developed for a weaker version of kRSP, the k bi-constraint path problem of computing k disjoint st-paths to satisfy the given cost constraint and delay constraint simultaneously [7]. In this paper, an approximation algorithm with bifactor ratio (2, 2) is first given for the kRSP problem. Then it is improved such that for any resulted solution, there exists a real number 0 ≤ α ≤ 2 that the delay and the cost of the solution is bounded, respectively, by α times and 2 - α times of that of an optimal solution. These two algorithms are both based on rounding a basic optimal solution of a LP formula, which is a relaxation of an integral linear programming (ILP) formula for the kRSP problem. The key observation of the two ratio proofs is to show that, the fractional edges of a basic solution to the LP formula will compose a graph in which the degree of every vertex is exactly 2. To the best of our knowledge, it is the first algorithm with a single factor polylogarithmic ratio for the kRSP problem. © 2014 Springer International Publishing.

Chen X.,Xiamen University | Chen X.-M.,Jimei University | Chen X.-M.,Kyoto University | Cai Z.-X.,Fuzhou University | And 3 more authors.
Electrochimica Acta | Year: 2013

A nonenzymatic electrochemical method was developed for hydrogen peroxide (H2O2) detection using an electrode modified with palladium nanoparticles (PdNPs)-graphene nanosheets (PdNPGNs). Ultrafine PdNPs were homogeneously modified on graphene nanosheets through a facile spontaneous redox reaction and characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy technique. Based on the voltammetric and amperometric results, the PdNPGNs-modified glassy carbon electrode (PdNPGNs-GCE) demonstrated direct and mediatorless responses to H2O2 at a low potential. The analytical performances of the PdNPGNs-GCE toward H2O2 reduction was evaluated in the linear response range from 0.1 μM to 1.0 mM, with a detection limit (S/N = 3) of 0.05 μM. The PdNPGNs-GCE showed excellent resistance toward poisoning from such interfering species as ascorbic acid, dopamine and glucose. Furthermore, the electrochemical sensor presented good characteristics in terms of stability and reproducibility, promising the applicability of this sensor in practical analysis. © 2013 Elsevier Ltd.

Wang W.,Fuzhou University
Mathematical Methods in the Applied Sciences | Year: 2015

A fluid-particles system of the compressible Navier-Stokes equations and Vlasov-Fokker-Planck equation (including the case of Vlasov equation) in three-dimensional space is considered in this paper. The coupling arises from a drag force exerted by the fluid onto the particles. We study a Cauchy problem with large data, and establish the existence of global weak solutions through an approximation scheme, energy estimates, and weak convergence. © 2015John Wiley & Sons, Ltd.

Cai Z.-X.,Xiamen University | Liu C.-C.,Fuzhou University | Wu G.-H.,Xiamen University | Chen X.-M.,Jimei University | Chen X.,Xiamen University
Electrochimica Acta | Year: 2014

A green synthesis of Pt-on-Pd bimetallic nanodendrites supported on graphene (GPtPdNDs) with a Pd interior and a dendrite-like Pt exterior was achieved using a two-step preparation, mixing graphene and PdCl4 2- first, then adding PtCl4 2- and ethanol without any other solvent. The morphology, structure and composition of the thus-prepared GPtPdNDs were characterized by transmission electron microscopy (TEM), high resolution TEM, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Because no halide ions (refer in particular to Br-, I-) or surfactant was involved in the synthesis, the prepared GPtPdNDs were directly modified onto a glassy carbon electrode and showed excellent electrocatalytic performance in methanol oxidation without any pretreatments. Moreover, with the special structure of PtPdNDs and the synergetic effects of Pt and Pd and the enhanced electron transfer by graphene, the GPtPdNDs composites exhibited higher electrocatalytic activity and better tolerance to Pt nanoparticles supported on graphene (GPtNPs) and Pt/C for methanol oxidation. © 2014 Elsevier Ltd.

To assess the effect of electroacupuncture in different frequencies by electromyography and walking function measure in post-stroke patients with lower-extremity (OLE) spasticity and hemiparesis. Fifty cases of post-stroke whose motor deficit was classified into Brunnstrom stage II - IV were randomly divided into a 100 Hz group, a 50 Hz group and a 2 Hz group. They were accepted 100 Hz, 50 Hz or 2 Hz of electroacupuncture (EA) therapy combined with standard rehabilitation program. Main outcome measures included integrated electromyography (IEMG) score during maximum isometric voluntary contraction (MIVC) of the knee flexors and extensors, ankle dorsiflexors and planterflexors in the affected LE recorded by surface EMG, Co-contraction ratio calculated by IEMG score of the antagonist over that of the agonist plus antagonist, Composite Spasticity Scale (CSS), Fugl-Meyer Motor Scale (FMS) and Functional Ambulation Categories (FAC) on LE. All outcomes were assessed at the baseline and after treatment by the professional practitioners who blinded to the treatment. After EA treatment, IEMG of rectus femoris were decreased in 100 Hz and 50 Hz groups (P < 0.01, P < 0.05), and better than that in 2 Hz group (both P < 0.05); gastrocnemius IEMG were decreased in 100 Hz and 50 Hz groups (P < 0.05, P < 0.01); but IEMG of tibialis anterior muscle was increased only in 50 Hz group (P < 0.05). During knee flexion, EMG co-contraction ratio in MIVC declined in 100 Hz and 50 Hz groups were decreased significantly (P < 0.05, P < 0.01), and the co-contraction ratio between the non-affected and affected side were increased significantly in all the 3 groups after treatment (P < 0.01, P < 0.05). During ankle dorsiflexion, co-contraction ratio were decreased significantly in all the 3 groups (P < 0.05, P < 0.01), and cocontraction ratio between the non-affected and affected side was increased significantly only in 100 Hz after treatment (P < 0.01). FMS score, CSS and FAC were improved in all the 3 groups after treatment (all P < 0.01), but only FAC in 100 Hz group showed better effect than that in 50 Hz group or 2 Hz group (both P < 0.05). Electroacupuncture therapy combined with rehabilitation program is effective for the spasticity status of lower-extremity in post-stroke. The therapeutic effect of EA in the frequencies of 100 Hz or 50 Hz is superior to that of 2 Hz stimulation and parameter of 100 Hz may be optimal.

Chen W.H.,Fuzhou University
Zhongguo gu shang = China journal of orthopaedics and traumatology | Year: 2011

Bone marrow stromal cells (BMSCs), a kind of stem cells residing in bone marrow, have self-renewal, high proliferative capacity and the potential of multilineage differentiation. It has a good prospect in application of the cell replacement therapy, the gene therapy and the tissue engineering and so on. As the content of BMSCs is extremely low in bone marrow, BM-SCs must be amplified in vitro and induced to differentiation to meet the clinical needs. Researches of the recent years suggest there is a very promising way that Chinese medicine could induce BMSCs proliferation, differentiation. Based on the Chinese medicine theory, "the kidney generating marrow and dominating bone" and "kidney storing essence, essence and marrow", the TCM scholars have done some researches to explore the function of warming yang and reinforcing kidney of Chinese medicine to promote bone marrow stromal cells and found that these drugs can promote the BMSCs to proliferate and to differentiate into osteogenic, cartilage and nerve cells. This article elaborates and presents the researches on this aspect.

Lin Y.Q.,Fuzhou University | Ren W.X.,Hefei University of Technology | Ren W.X.,Central South University | Fang S.E.,Hefei University of Technology
Smart Materials and Structures | Year: 2011

Although most vibration-based damage detection methods can acquire satisfactory verification on analytical or numerical structures, most of them may encounter problems when applied to real-world structures under varying environments. The damage detection methods that directly extract damage features from the periodically sampled dynamic time history response measurements are desirable but relevant research and field application verification are still lacking. In this second part of a two-part paper, the robustness and performance of the statistics-based damage index using the forward innovation model by stochastic subspace identification of a vibrating structure proposed in the first part have been investigated against two prestressed reinforced concrete (RC) beams tested in the laboratory and a full-scale RC arch bridge tested in the field under varying environments. Experimental verification is focused on temperature effects. It is demonstrated that the proposed statistics-based damage index is insensitive to temperature variations but sensitive to the structural deterioration or state alteration. This makes it possible to detect the structural damage for the real-scale structures experiencing ambient excitations and varying environmental conditions. © 2011 IOP Publishing Ltd.

Di Y.,Max Planck Institute of Colloids and Interfaces | Wang X.,Max Planck Institute of Colloids and Interfaces | Wang X.,Fuzhou University | Thomas A.,TU Berlin | Antonietti M.,Max Planck Institute of Colloids and Interfaces
ChemCatChem | Year: 2010

10.1002/cctc.201000057.abs Gold nanoparticles were deposited on the surface of a g-C3N4 semiconductor by deposition-precipitation, photodeposition, and impregnation methods to make metal-semiconductor junctions for photocatalytic hydrogen evolution from aqueous solution containing an electron donor with visible light illumination. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV/Vis, and transmission electron microscopy (TEM). Results show that the Au/g-C3N4 prepared by the deposition-precipitation method possessed the best photocatalytic activity, due to the formation of tight Au-semiconductor heterojunctions effectively promoting the transfer of charge from light-excited g-C3N4. Surface modification of the Au/g-C3N4 with a second metal further improved the activity of the photocatalytic system, which was explained by simultaneous optimization of electron transfer by the gold and chemical reactivity by the secondary metal. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhu J.,TU Berlin | Wei Y.,China University of Petroleum - Beijing | Chen W.,Fuzhou University | Zhao Z.,China University of Petroleum - Beijing | Thomas A.,TU Berlin
Chemical Communications | Year: 2010

Polymeric carbon nitride is reported to be a promising candidate in environmental catalysis for NO decomposition carried out at elevated temperature. Theoretical calculations support a mechanism where Lewis basic site of g-C3N4 can donate electrons to the adsorbed NO, decreasing the bond order of N-O thus facilitating the reaction. © 2010 The Royal Society of Chemistry.

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.

Xu H.,Fuzhou University
International Journal of Remote Sensing | Year: 2013

Impervious surface mapping has become a recent concern in remote-sensing applications because of worldwide urban growth and the resultant environmental changes. However, many effective impervious surface mapping techniques developed for moderate- resolution imagery are not applicable to high spatial resolution imagery such as that of IKONOS and the Advanced Land Observing Satellite (ALOS) due to their limited number of spectral bands and the lack of middle-infrared bands. In response to this need, this article proposes a rule-based approach to extract impervious surface features from high spatial resolution imagery. Images of IKONOS, ALOS and Système Pour l'Observation de la Terre 5 (SPOT-5) from three different cities were used for the approach. The general rules used for extracting impervious surface features from the images were deduced from the signatures of land cover classes but are not scene-specific. Based on these rules, impervious surface features were effectively discriminated from the categories such as soil and water, which were always confused with each other in previous work. The approach can achieve a high overall accuracy in imperviousness extraction efforts. © 2013 Taylor & Francis.

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.

Zhou L.-J.,CAS Fujian Institute of Research on the Structure of Matter | Zhou L.-J.,University of Chinese Academy of Sciences | Zhang Y.-F.,Fuzhou University | Wu L.-M.,CAS Fujian Institute of Research on the Structure of Matter
Nano Letters | Year: 2013

In excitonic solar cells (XSC), power conversion efficiency (PCE) depends critically on the interface band alignment between donor and acceptor materials. Graphene or silicene is not suitable for donor materials due to their semimetallic features (zero band gaps); it is therefore highly desired to open an energy gap in graphene or silicene to extend their application in optoelectronic devices, especially in photovoltaics. In this paper, based on the global particle-swarm optimization algorithm and the density functional theory methods, we predict a novel SiC2 siligraphene (g-SiC2) with a direct band gap of 1.09 eV showing infinite planar geometry, in which Si and C atoms adopt sp2 hybridization and C atoms form delocalized 4 C-domains that are periodically separated by Si atoms. Such a g-SiC2 siligraphene (with a global minimum of energy) is 0.41 eV/atom lower and thermally stabler than the isomeric pt-SiC2 silagraphene containing planar 4-fold coordinated silicon (3000 K vs 1000 K). Interestingly, the derivative (n, 0), (n, n) nanotubes (with diameters greater than 8.0 Å) have band gaps about 1.09 eV, which are independent of the chirality and diameter. Besides, a series of g-SiC2/GaN bilayer and g-SiC 2 nanotube/ZnO monolayer XSCs have been proposed, which exhibit considerably high PCEs in the range of 12-20%. © 2013 American Chemical Society.

In this paper, we investigate the asymptotic behavior of global classical solutions to the mixed initial-boundary value problem with small BV data for linearly degenerate quasilinear hyperbolic systems with general nonlinear boundary conditions in the half space {(t,x)|t]≤0,x≤0}. Based on the existence result on the global classical solution, we prove that when t tends to the infinity, the solution approaches a combination of C 1 traveling wave solutions, provided that the C 1 norm of the initial and boundary data is bounded and the BV norm of the initial and boundary data is sufficiently small. Applications to quasilinear hyperbolic systems arising in physics and mechanics, particularly to the system describing the motion of the relativistic string in the Minkowski space-time R1+n, are also given. © 2009 Springer Science+Business Media B.V.

Lin Y.,Fuzhou University
Journal of Applied Crystallography | Year: 2010

A.NET class library for STAR/CIF manipulation, ASTAR, has been developed and is available at http://xstar.sourceforge.net/astar/. The library provides facilities to read and write STAR/CIF files and an object model to manipulate data in STAR/CIF files. While the library is written in the C# programming language, it can be utilized by programs written in various programming languages targeting the.NET platform. © 2010 International Union of Crystallography Printed in Singapore - all rights reserved.

The aim of this paper is to develop a closeness coefficient based nonlinear programming method for solving multiattribute decision making problems in which ratings of alternatives on attributes are expressed using interval-valued intuitionistic fuzzy (IVIF) sets and preference information on attributes is incomplete. In this methodology, nonlinear programming models are constructed on the concept of the closeness coefficient, which is defined as a ratio of the square of the weighted Euclidean distance between an alternative and the IVIF negative ideal solution (IVIFNIS) to the sum of the squares of the weighted Euclidean distances between the alternative and the IVIF positive ideal solution (IVIFPIS) as well as the IVIFNIS. Simpler nonlinear programming models are deduced to calculate closeness intuitionistic fuzzy sets of alternatives to the IVIFPIS, which are used to estimate the optimal degrees of membership and hereby generate ranking order of the alternatives. The derived auxiliary nonlinear programming models are shown to be flexible with different information structures and decision environments. The proposed method is validated and compared with other methods. A real example is examined to demonstrate applicability of the proposed method in this paper. © 2011 Elsevier B.V.

Yang F.,Fuzhou University
Safety Science | Year: 2012

With the rapid development of increasingly complex technology and large scale industrial projects, all kinds of safety problems become extremely intricate in daily safety management (SM). It is therefore indispensable to effectively collect, analyze, assess, and synthesize information that is relevant to accident risk. In this paper, the concept of the information literacy (IL) of professionals in SM is proposed, and a conceptual framework is put forward. Further, determinants of the IL of safety professionals are suggested, including individual attributes, safety climate and culture, information infrastructure, information technology (IT) human resources, production technology and management, and national information policy, law and ethics. Of course, further research on the IL of safety professionals should be carried out for effective SM. © 2011 Elsevier Ltd.

Huang J.,Fuzhou University | Wang Z.,South China University of Technology
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2012

Structural robustness reflects the insensitivity of a structure system to local damages. To evaluate the progressive collapse resistance of steel frames, a quantitative assessment method for the robustness of steel frames is presented. By considering the contributions of structural members to the structural energy distribution and the influence areas of localized damage of structural members, a method for calculating the importance indices of members is given, which can be used to determine the most possibly unfavorable initial damage modes of a frame structure. By analyzing the steel member load capacity redundancy and the strain energy sensitivities of individual members, a structural redundancy index of steel frames is brought forward based on the localized damage modes, which is directly proportional to the member load capacity redundancy and inversely proportional to the member strain energy sensitivity. The minimum of the structural redundancy indices is employed to measure the robust performance of a steel frame, after discussing the differences in definition between structural redundancy and structural robustness. A quantitative assessment approach to structural robustness of steel frames in terms of damage mode based structural redundancy is proposed, and the scope of its application is then analyzed. Finally, an example of 8-story space steel frame is given to demonstrate the feasibility of the presented approach to evaluating the structural robustness of steel frames.

Dynamic coating of the surface in capillary electrophoresis with chemiluminescence detection (CE-CL) using an off-column coaxial flow interface for the determination of four hemeproteins was developed. This method is based on the luminol-hydrogen peroxide reaction catalyzed by metalloproteins in alkaline medium. The experimental setup of the CE-CL system with the proposed off-column coaxial interface was evaluated by separation and detection of dopamine and catechol based on inhibition of the luminol-potassium ferricyanide reaction. Highly efficient separation of the two model compounds with symmetrical peak shape and satisfactory reproducibility was achieved by using this interface. In addition, in order to obtain a good resolution for hemeproteins, polyvinylpyrrolidone (PVP) combined with sodium dodecyl sulfate (SDS) were introduced as dynamic modifiers to reduce the unwanted adsorption of non-specific protein. Several parameters affecting the CE separation and CL detection were investigated in detail. Under the optimized conditions, a mixture of the four hemeproteins (horseradish peroxidase (HRP), catalase (Cat), myoglobin (Mb) and cytochrome C (Cyt C)) could be well separated within 20 min. The linear ranges of the four proteins were 5.7 × 10(-8) to 1.1 × 10(-6) mol L(-1) for HRP, 4.0 × 10(-8) to 2.0 × 10(-6) mol L(-1) for Cat, 1.1 × 10(-10) to 5.6 × 10(-8) mol L(-1) for Mb, and 3.8 × 10(-7) to 7.7 × 10(-6) mol L(-1) for Cyt C. The limits of detection (LODs) (S/N = 3) for HRP, Cat, Mb and Cyt C were 2.2 × 10(-8) mol L(-1) (104.5 amol), 1.6 × 10(-8) mol L(-1) (74 amol), 5.6 × 10(-11) mol L(-1) (0.26 amol), and 1.95 × 10(-7) mol L(-1) (0.89 fmol), respectively. The proposed method has been successfully applied to the analysis of low-level Mb in a spiked human urine sample and the recoveries were above 97%. Our primary result demonstrated that the proposed CE-CL method has great potential for Mb determination in clinical diagnosis.

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.

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.

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.

Su Y.,Fuzhou University
Chinese Control Conference, CCC | Year: 2015

In this paper, we study the cooperative robust output regulation problem of a class of heterogeneous minimum phase linear uncertain multi-agent systems with the arbitrary nonidentical relative degree via the output feedback control. We will propose a novel distributed observer to estimate the system state that contains two distinct parts, where the first part is of the distributed form to estimate the regulated error, while the second part is a modified version of the standard reduced order high gain observer by replacing the regulated error with its estimation given in the first part. Comparing with some current literatures, our design applies to a much larger class of linear multi-agent systems. © 2015 Technical Committee on Control Theory, Chinese Association of Automation.

Zhou J.,Fuzhou University
Advance Journal of Food Science and Technology | Year: 2015

In this study, Sanming in Fujian was taken as an example and it mainly analyzed the change of farmers' livelihoods after the collective forest right system reform. The results were found that farmers' livelihood strategy was changed from relying mainly on agricultural production to gradually focus on the accumulation and transformation, of financial capital. Moreover, principal component analysis was used to analyze which factors impacted on farmers' livelihood. The results showed that whether having forestry right certification, forestry land quality, forestry land quantity have become the main performance of farmers livelihood changes. © Maxwell Scientific Organization, 2015.

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.

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.

Shao Z.,Fuzhou University
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2016

In this paper, we study the Riemann problem with the initial data containing the Dirac delta function for the isentropic relativistic Chaplygin Euler equations. Under suitably generalized Rankine–Hugoniot relation and entropy condition, we constructively obtain the global existence of generalized solutions including delta shock waves that explicitly exhibit four kinds of different structures. Moreover, it can be found that the solutions constructed here are stable for the perturbation of the initial data. © 2016, Springer International Publishing.

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.

Li D.-F.,Fuzhou University
Fuzzy Optimization and Decision Making | Year: 2010

The aim of this paper is to develop a new methodology for solving fuzzy multi-attribute group decision making problems with non-homogeneous information, including multi-granular linguistic term sets, fuzzy numbers, interval values and real numbers. In this methodology, different distances are defined to measure differences between alternatives and the ideal solution as well as the negative ideal solution. A relative closeness method is developed by introducing the multi-attribute ranking index based on the particular measure of closeness to the IS. The proposed method determines a compromise solution for the group, providing a maximum "group utility" for the "majority" and a minimum of an individual regret for the "opponent". The implementation process, effectiveness and feasibility of the method proposed in this paper are illustrated with a real example of the missile weapon system design project selection. © 2010 Springer Science+Business Media, LLC.

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 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.

Xu N.,Fuzhou University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

Based on the analysis of structural characteristics of the magnesium alloy gearbox cover, the gating system, exhausting system, cooling system and core-pulling mechanism of magnesium alloy die-casting molds were described. Process parameters were optimized and applied to produce qualified products. The practical production exhibits the feasibility of mold design and processing parameter selection. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.

Fei W.,Fuzhou University
International Journal of Fuzzy System Applications | Year: 2015

There are lots of errors and misprints in the article by Yager (2008), titled "Using trapezoids for representing granular objects: Applications to learning and OWA aggregation " [Information Sciences, 178(2), pp. 363-380]. The aim of this note is to give some corrections on the article. Copyright © 2015, IGI Global.

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.

Li D.F.,Fuzhou University | Nan J.X.,Dalian University | Zhang M.J.,Dalian University of Technology
International Journal of Computational Intelligence Systems | Year: 2010

Ranking of triangular intuitionistic fuzzy numbers (TIFNs) is an important problem, which is solved by the value and ambiguity based ranking method developed in this paper. Firstly, the concept of TIFNs is introduced. Arithmetic operations and cut sets over TIFNs are investigated. Then, the values and ambiguities of the membership degree and the non-membership degree for TIFNs are defined as well as the value-index and ambiguity-index. Finally, a value and ambiguity based ranking method is developed and applied to solve multiattribute decision making problems in which the ratings of alternatives on attributes are expressed using TIFNs. A numerical example is examined to demonstrate the implementation process and applicability of the method proposed in this paper. Furthermore, comparison analysis of the proposed method is conducted to show its advantages over other similar methods.

He Z.,Fuzhou University
Chinese Control Conference, CCC | Year: 2015

Hub is the data instance that appears frequently in other instances' nearest neighbour lists. Hubness, the emergence of hubs, is an important property of high-dimensional datasets. An instance with a large hubness score is usually close to the centre of a cluster, whereas that with a small score is often an outlier or a boundary instance. In this paper, a hubness score based sampling approach is proposed for PAM algorithm. It selects some of the high hubness score instances to reduce redundancy, and at the same time, guarantees that every instance from original dataset will have some of its K nearest neighbours being selected. Experimental results on six UCI datasets and two synthetic datasets suggests: when K is set to 10, the approach removes more than 80% instances and increases clustering accuracy. © 2015 Technical Committee on Control Theory, Chinese Association of Automation.

Guo L.,CAS Research Center for Eco Environmental Sciences | Guo L.,Fuzhou University | Liu Q.,CAS Research Center for Eco Environmental Sciences | Li G.,CAS Research Center for Eco Environmental Sciences | And 4 more authors.
Nanoscale | Year: 2012

A facile and universal approach to prepare graphene-based nanocomposites by in situ nucleation and growth of diverse noble metals, metal oxides and semiconducting nanoparticles on the surface of RGO is proposed. This journal is © 2012 The Royal Society of Chemistry.

Fei W.,Fuzhou University
International Journal of Fuzzy System Applications | Year: 2015

The bimatrix game theory is concerned with how two players make decisions when they are faced with known exact payoffs. The aim of this paper is to develop a simple and an effective bilinear programming method for solving bimatrix games in which the payoffs are represented by intervals. Because the payoffs of the bimatrix game are intervals, the values of the bimatrix game for both players are intervals as well from the viewpoint of logic. Based on the definition of the values of the bimatrix game for players, the game values may be regarded as functions of payoffs belonging to the payoff intervals, which are proven to be monotonic non-decreasing. A pair of auxiliary bilinear programming models is formulated to obtain the upper bound and the lower bound of the interval-type values of the interval-valued bimatrix game by using the upper bounds and the lower bounds of the payoff intervals, respectively. A real example of the engineering project management problem is used to illustrate the applicability and effectivity of the proposed models and method. Copyright © 2015, 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.

Song J.,Dalian University of Technology | Xia Y.,Dalian University of Technology | Xia Y.,Fuzhou University | Song H.-S.,Dalian University of Technology
Applied Physics Letters | Year: 2010

We propose a scheme to generate an N -qubit cluster state by adiabatic passage in coupled cavities. The required interaction time keeps unchanged with the increasing of the number of qubits and need not be accurately controlled. In addition, the scheme is robust against the fluctuations of some experimental parameters. © 2010 American Institute of Physics.

Xiong D.,Fuzhou University
Journal of Statistical Mechanics: Theory and Experiment | Year: 2016

Previous studies have suggested a crossover from superdiffusive to normal heat transport in one-dimensional (1D) anharmonic oscillator systems with a double-well type interatomic interaction like , when the system temperature is varied. In order to better understand this unusual manner of thermal transport, here we perform a direct dynamics simulation to examine how the spreading processes of the three physical quantities, i.e. the heat, the total energy and the momentum, would depend on temperature. We find three main points that are worth noting. (i) The crossover from superdiffusive to normal heat transport is well verified from a new perspective of heat spread. (ii) The spreading of the total energy is found to be very distinct from heat diffusion, especially under some temperature regimes, energy is strongly localized, while heat can be superdiffusive. So one should take care to derive a general connection between the heat conduction and energy diffusion. (iii) In a narrow range of temperatures, the spreading of momentum implies clear unusual non-ballistic behaviors; however, such unusual transport of momentum cannot be directly related to the normal transport of heat. An analysis of phonon spectra suggests that one should also take the effects of phonon softening into account. All of these results may provide insights into establishing the connection between the macroscopic heat transport and the underlying dynamics in 1D systems. © 2016 IOP Publishing Ltd and SISSA Medialab srl.

Liu F.,Portland State University | Niu Y.,Fuzhou University | Jin H.,Adobe Research
Proceedings of the IEEE International Conference on Computer Vision | Year: 2013

Shaky stereoscopic video is not only unpleasant to watch but may also cause 3D fatigue. Stabilizing the left and right view of a stereoscopic video separately using a monocular stabilization method tends to both introduce undesirable vertical disparities and damage horizontal disparities, which may destroy the stereoscopic viewing experience. In this paper, we present a joint subspace stabilization method for stereoscopic video. We prove that the low-rank subspace constraint for monocular video [10] also holds for stereoscopic video. Particularly, the feature trajectories from the left and right video share the same subspace. Based on this proof, we develop a stereo subspace stabilization method that jointly computes a common subspace from the left and right video and uses it to stabilize the two videos simultaneously. Our method meets the stereoscopic constraints without 3D reconstruction or explicit left-right correspondence. We test our method on a variety of stereoscopic videos with different scene content and camera motion. The experiments show that our method achieves high-quality stabilization for stereoscopic video in a robust and efficient way. © 2013 IEEE.

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.

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.

Chen D.,Fuzhou University | Han C.,Towson University
Journal of Internet Banking and Commerce | Year: 2012

Peer-to-Peer (P2P) lending provides online users an innovative loaning and investment vehicle without the intermediation of financial institutions. However, the research on online P2P lending is still scarce. In this study we review relevant literature and conduct a comparative study of online P2P lending practices in the USA and China. We find that two categories of credit information, "hard" and "soft" information, may have profound influences on lending outcomes in both countries, but lenders in China is more reliable on "soft" information. This study provides valuable insights for future research and practices and enriches the understanding of online P2P lending across countries. © Dongyu Chen and Chaodong Han, 2012.

Wang R.-S.,Fuzhou University
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2014

A new type of flat top quasi-sinusoidal modulation wave was designed and optimized to solve the complexity issue in the existing pulse width modulation (PWM) overmodulation algorithm. The technique increase fundamental amplitude, at the same time minimizes the low-order harmonic influence. It samples the modulating wave with a triangular carrier wave, and linearly changes PWM fundamental component amplitude through changing the modulating wave height in the linear range. In the overmodulation range, it continuously increases the fundamental component amplitude till approaching a square wave by broadening the flat top width of modulating wave while maintaining the maximum height as a constant. To maintain linearity between fundamental component amplitude and modulation index M in overmoudulation range, a lookup table including the flat top width and M relationship was pre-programmed into a microprocessor for real time implement. The new PWM algorithm is simple. Compared with sinusoidal pulse width modulation (SPWM), the technique produces 19% higher maximum fundamental component amplitude in linear modulation range; its total harmonic current distortion is lower at M∈[0.55, 1], and slightly higher at M∈[0, 0.55] but the increase is less than 2.2% under the same carrier wave frequency ratio N=33 condition. The new technique was validated with experiment results.

Tu J.,Fuzhou University
Quality and Reliability Engineering International | Year: 2015

Investigations have shown that human error is the most common cause of roof bolting injuries. Human error probability estimation has become a critical issue for human reliability analysis (HRA) of roof bolting operation. Specialist judgment plays a crucial role in quantifying human error probability in the field because of limited availability of empirical data. However, the aggregation of specialist judgment is typically not carried out in a formal way in HRA. In this paper, an approach to combine Bayesian methodology and the success likelihood index method was to build a computable model using information from specialists for HRA of roof bolting operation. A numerical example was used to illustrate the application of the proposed methodology. © 2015 John Wiley & Sons, Ltd.

Akagi T.,Kyushu University | Fu F.-F.,Fuzhou University | Hongo Y.,RIKEN | Takahashi K.,Kyushu University
Geochimica et Cosmochimica Acta | Year: 2011

Settling particles were sampled monthly for 1. year using an automated time-series sediment trap positioned at similar depths at two sites of high diatomaceous productivity in the North Pacific Ocean and Bering Sea. The particles were analyzed for rare earth elements (REEs) by inductively coupled plasma mass spectrometry (ICP-MS) with and without chemical treatment of the bulk samples to isolate siliceous fractions. The REE composition of the bulk samples is explained largely by the contribution of two distinct components: (i) carbonate with a higher REE concentration, a negative Ce anomaly and lighter REE (LREE) enrichment; (ii) opal with a lower REE concentration, a weaker negative Ce anomaly and heavier REE (HREE) enrichment.The siliceous fractions of settling particles are characterized by high Si/Al ratios (30-190), reflecting high diatom productivity at the studied sites. The La/Al ratio of the siliceous fraction is close to that of the upper crust, but the Lu/Al and Lu/La ratios are significantly higher than those of the upper crust or airborne particles, indicating the presence of excess HREEs in the siliceous fraction. Diatoms are believed to be important carriers of HREEs.The Ce anomaly, Eu anomaly, slope of the REE pattern, and ΣREE of the siliceous fraction vary exponentially with decreasing total mass flux. They can be well-reproduced according to the differential dissolution kinetics of elements in the order of Ce. <. lighter REEs (LREEs) < Eu = heavier REEs (HREEs) < Si from settling particles, where the dissolution rate is critically reduced through particle aggregation. This order is consistent with the vertical distribution of dissolved REEs and Si in oceans. The differential dissolution kinetics leads to HREE enrichment of the original diatoms and REE enrichment of dissolved diatoms. The Lu/Si ratio of the siliceous fraction of settling particles recovered from some of the highest diatom fluxes is identical to that of the two elements dissolved in deep seawater, providing further evidence for the dissolution of siliceous matter in deep water. © 2011 Elsevier Ltd.

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.

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.

Tian L.-J.,Beihang University | Tian L.-J.,Fuzhou University | Huang H.-J.,Beihang University | Gao Z.-Y.,Beijing Jiaotong University
Networks and Spatial Economics | Year: 2012

This paper presents a cumulative perceived value-based dynamic user equilibrium model by applying the prospect theory to formulate the travelers' risk evaluation on arrival time. The network uncertainty caused by link exit capacity degradation is incorporated into the analysis. The model which considers departure time and route choices simultaneously is expressed by a variational inequality in a discrete time space. Numerical results show that the travelers' risk preference indeed has big influence on flow distribution. Our study constitutes a deepening of cognition in developing more realistic dynamic traffic assignment technologies. © 2011 Springer Science+Business Media, LLC.

Huang Y.,Fuzhou University
ICIC Express Letters, Part B: Applications | Year: 2013

An improved extreme learning machine is proposed to avoid the over-fitting in learning. Then, a novel internal model control strategy is designed by the improved extreme learning machine. Specifically, use the improved extreme learning machine to estimate the internal model, and the model is expanded by Taylor series to calculate the controller in the internal model control system. Moreover, the stability and the error are also easy to analyze for the proposed internal model control system. Finally, the proposed strategy is simulated to control the consistency in the continuous stirred tank reactor. The experimental results indicate that the proposed control strategy yields an excellent system performance with a small stable error and a strong robustness. © 2013.

Li D.-F.,Fuzhou University
Computers and Mathematics with Applications | Year: 2010

The concept of an intuitionistic fuzzy number (IFN) is of importance for quantifying an ill-known quantity, and the ranking of IFNs is a very difficult problem. The aim of this paper is to introduce the concept of a triangular IFN (TIFN) as a special case of the IFN and develop a new methodology for ranking TIFNs. Firstly the concepts of TIFNs and cut sets as well as arithmetical operations are introduced. Then the values and ambiguities of the membership function and the non-membership function for a TIFN are defined. A new ranking method is developed on the basis of the concept of a ratio of the value index to the ambiguity index and applied to multiattribute decision making problems in which the ratings of alternatives on attributes are expressed with TIFNs. The validity and applicability of the proposed method, as well as analysis of the comparison with other methods, are illustrated with a real example. © 2010 Elsevier Ltd. All rights reserved.

Jun Y.-S.,University of California at Santa Barbara | Lee E.Z.,Korea Advanced Institute of Science and Technology | Wang X.,Fuzhou University | Hong W.H.,Korea Advanced Institute of Science and Technology | And 2 more authors.
Advanced Functional Materials | Year: 2013

Graphitic carbon nitride (g-CN) is a promising heterogeneous metal-free catalyst for organic photosynthesis, solar energy conversion, and photodegradation of pollutants. Its catalytic performance is easily adjustable by modifying texture, optical, and electronic properties via nanocasting, doping, and copolymerization. However, simultaneous optimization has yet to be achieved. Here, a facile synthesis of mesoporous g-CN using molecular cooperative assembly between triazine molecules is reported. Flower-like, layered spherical aggregates of melamine cyanuric acid complex (MCA) are formed by precipitation from equimolecular mixtures in dimethyl sulfoxide (DMSO). Thermal polycondensation of MCA under nitrogen at 550°C produces mesoporous hollow spheres comprised of tri-s-triazine based g-CN nanosheets (MCA-CN) with the composition of C3N4.14H1.98. The layered structure succeeded from MCA induces stronger optical absorption, widens the bandgap by 0.16 eV, and increases the lifetime of photoexcited charge carriers by twice compared to that of the bulk g-CN, while the chemical structure remains similar to that of the bulk g-CN. As a result of these simultaneous modifications, the photodegradation kinetics of rhodamine B on the catalyst surface can be improved by 10 times. Simple molecular engineering of triazine precursors enables simultaneous optimization of the texture and photoelectric properties of graphitic carbon nitride (g-CN). Thermolysis of flower-like supramolecular aggregates of melamine and cyanuric acid yields the formation of mesoporous g-CN hollow spheres with the typical nanosheet-type structure preserved in the microspheres. Such structures are highly active in the photocatalytic degradation of organic pollutants. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chen Y.,Fuzhou University
Open Automation and Control Systems Journal | Year: 2015

In this paper, the main contributions of this work include three aspects. First, the deployment on different datacenters of Impala which is a database based on Ring Distributed Hash. This thesis deploys Impala system on different datacenters across WAN or across regions. Second, the research of data storage and search method based on circular distributed hash. This thesis adopts distributed hash table and Distributed Hash ring to distributed file system. Every data and storage node will be calculated the hash value, by which we map the data to its storage node. According to the saved metadata, we take use of binary search method to find the location of data. Third, the research of data migration based on circular distributed hash. If a new node is added in Ring Distributed Hash, its "neighbor" will transport some data to it. Similarly, when a node breaks down, its data will be made backup to its "neighbor". © Ye Chen.

Zhao J.,Fuzhou University
Progress in Chemistry | Year: 2014

The special and unique role of the spacer of Gemini surfactant in self-assembly is reviewed, which is considered to benefit mainly from both the spacer length and the rigid/flexible features. These two effects lead to the synergism of two alkyl tails of a Gemini molecule, the change in the charge density of its headgroups, the variation of its molecule geometry by which rich structures and morphologies of aggregates yield, etc. More detailed, the flexible spacer influences the above functions of the Gemini mainly depending on its length. Too long flexible spacer can bend toward the alkyl tails so as to meet the chemical environment around the molecule, by which the molecule self-assembly is influenced. The effect of the short rigid spacer is almost identical with that of the flexible spacer having a similar length. However, the long rigid spacer yields quite different effects from the flexible spacer owing to the two alkyl tails are inhibited to be close, which leads to the column-like molecular shape and the identical probability for the cis/trans configuration of the two alkyl tails around the spacer. These make the Geminis with long rigid spacer form network-like aggregates at low concentrations, which can be transformed into threadlike micelles or vesicles with low surface curvature with increasing the Gemini concentration or adding a few additives. Under suitable conditions, a few molecules in the aggregates can be hastened to yield trans-form, resulting in the cohesion between the aggregates through the hydrophobic interactions between the extended alkyl tails. The chemical modification for the spacer is also discussed, which is expected to promote molecular self-assembly, or give some new functions to the aggregates. The cases listed here well indicate the specialty and uniqueness of the Gemini-structure of molecule and impress us for the complicated self-assembly behavior and diversified aggregates of Gemini surfactants.

Peptide-protein interactions have critical roles in biology. Monitoring peptide-protein interactions plays an important role in investigating molecular recognition, screening drugs, and designing biosensors. In this paper, we develop a novel fluorescent approach to monitor peptide-protein interactions based on the assembly of pyrene-labeled peptide and graphene oxide (GO). The pyrene-labeled peptide is strongly adsorbed on the surface of GO via π-π interactions and hydrophobic interactions. As a result, the proximity of the GO to the pyrene moiety effectively quenches the fluorescence of pyrene. In the presence of target protein, the competitive binding of the target protein with GO for peptide results in the restoration of fluorescence signal. This signaling mechanism makes it possible to monitor the peptide-protein interactions in a homogeneous real-time format.

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.

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.

Liu J.,Fuzhou University
Proceedings of 2012 International Symposium on Information Technologies in Medicine and Education, ITME 2012 | Year: 2012

In order to meet a number of industries hardware that require high reliability and large amount of code, this paper gives a model-based design (MBD) workflow compliance with DO-254 standard for hardware development process. Taking the Digital down conversion (DDC) for example; this paper has described how to use the tool chain of Simulink, HDL Coder and Modelsim to complete the entire development process. In this way, we can build a DDC model starting from requirements analysis to functional verification and system testing of the model, fixed-point optimization, code generation, and then validation the DDC system on XUPV5 board in visual development environment. The entire process which starts from design concept to hardware implementation always focuses on the DDC model for continuous testing and verification. In this way, we can verify and validate the correctness of the design of DDC in three different levels, so that design flaws could be exhumed in the early stages of the development. The proposed solution is not only overcoming the flaws of low efficiency and difficulty of meeting the requirements in traditional methods of development, but also to avoid the potential risk in technology and market. © 2012 IEEE.

Zordan T.,Tongji University | Liu T.,Tongji University | Briseghella B.,Fuzhou University | Zhang Q.,Tongji University
Engineering Structures | Year: 2014

Nowadays, seismic isolation system has been widely applied in the world to mitigate damage risk of structures. Although maximum displacement demand can be obtained through nonlinear time history (NLTH) analysis, many approximate methods are frequently recommended in structural specifications to reduce the required computational time. One of the best-known methods is the equivalent linear (EL) method, in which the nonlinear response of isolator can be adequately modeled using a fictitious viscously damped elastic structure. In this paper, a comparison between existing expressions supplying the state of research is carried out and then, an improved expression is presented for equivalent linearization of structures supported on lead rubber bearings (LRB). Based on the concept of secant stiffness, the optimal damping ratios, which minimize the errors of maximum displacement between EL analysis and NLTH analysis, are calculated and averaged over 12 ground motions. Then, a rational model to estimate equivalent damping ratio is derived through statistic analysis of the optimal damping ratios. To examine the prediction accuracy of the proposed model, mean ratios of approximate to exact maximum displacement and root mean square error for different isolated period are calculated as evaluation indicator. Compared with other EL models, the newly proposed model predicts a displacement that is in better agreement with the one obtained through NLTH analysis. © 2014 Elsevier Ltd.

Xu C.,Fuzhou University | Wang X.,Nanjing University of Science and Technology
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2012

Graphene oxide sheets have been used as a kind of plane stabilizing agent to prepare Ag nanoparticle colloids. The utilization of graphene oxide has effects on the size of Ag nanoparticles and can enhance the stability of the as-prepared colloids. These graphene oxide stabilized Ag nanoparticles possess relatively uncapped surface, which behave good catalysis activity. Furthermore, we also prepared graphene oxide-mediated Au and Pt nanoparticle colloids through galvanic replacement reactions using graphene oxide-Ag nanoparticles as templates. © 2012 Elsevier B.V.

Li D.,Tohoku University | Li D.,Fuzhou University | Nakagawa Y.,Tohoku University | Tomishige K.,Tohoku University
Cuihua Xuebao/Chinese Journal of Catalysis | Year: 2012

Nickel catalysts are effective for the steam reforming of tar derived from biomass pyrolysis, but the improvement is needed in terms of activity, stability, suppression of coke deposition and aggregation, and regeneration. Our recent development of Ni-based catalysts for the steam reforming of tar is reviewed including the modification with CeO 2 (or MnO), trace Pt, and MgO. The role of additives such as CeO 2, MnO, Pt, and MgO is also discussed.

Su F.,Max Planck Institute of Colloids and Interfaces | Mathew S.C.,TU Berlin | Mohlmann L.,TU Berlin | Antonietti M.,Max Planck Institute of Colloids and Interfaces | And 3 more authors.
Angewandte Chemie - International Edition | Year: 2011

Coupling on sunshine: A simple and efficient synthesis of benzoxazoles, benzimidazoles, and benzothiazoles is realized through a one-pot preparation driven by a photocatalytic cascade reaction. Carbon nitride and visible light are employed to achieve this metal-free aerobic oxidation of amines to imines (see scheme; mpg-C3N4=mesoporous graphite carbon nitride). Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Wan S.-P.,Jiangxi University of Finance and Economics | Li D.-F.,Fuzhou University
Journal of Intelligent and Fuzzy Systems | Year: 2013

Triangular intuitionistic fuzzy numbers (TIFNs) are useful to deal with ill-known quantities in decision making problems. The focus of this paper is on multi-attribute decision making (MADM) problems in which the attribute values are expressed with TIFNs and the information on attribute weights is incomplete, which are solved by developing a new decision method based on possibility mean and variance of TIFNs. The notions of possibility mean and variance for TIFNs are introduced as well as the possibility standard deviation. A new ranking approach for TIFNs is developed according to the ratio of the possibility mean to the possibility standard deviation. Hereby we construct a bi-objective programming model, which maximizes the ratios of the possibility mean to the possibility standard deviation for membership and non-membership functions on alternative's overall attribute values. Using the lexicographic approach, the bi-objective programming model is transformed into two non-linear programming models, which are further transformed into the linear programming models by using the variable transformation. Thus, we can obtain the maximum ratios of the possibility mean to the possibility standard deviation, s are used to rank the alternatives. A numerical example is examined to demonstrate applicability and implementation process of the proposed method. © 2013 - IOS Press and the authors. All rights reserved.

Wang Y.-M.,Fuzhou University | Chin K.-S.,City University of Hong Kong
International Journal of Production Economics | Year: 2010

Cross-efficiency evaluation is an effective method for ranking decision-making units (DMUs) in data envelopment analysis (DEA) and can be performed with different formulations (aggressive or benevolent), secondary goals, and models. This paper proposes some new alternative models for DEA cross-efficiency evaluation to provide more methodological options for the decision maker (DM) to choose from. The proposed new alternative models are illustrated with two numerical examples. The results are believed to be more realistic than those obtained by the alternative secondary goals suggested by Liang et al. [Liang, L., Wu, J., Cook, W.D. and Zhu, J., 2008a. Alternative secondary goals in DEA cross-efficiency evaluation. International Journal of Production Economics 113 (2), 10251030]. © 2010 Elsevier B.V.All rights reserved.

Li D.-F.,Fuzhou University | Liu J.-C.,Fujian Agriculture and forestry University
IEEE Transactions on Fuzzy Systems | Year: 2015

The aim of this paper is to develop a new methodology for solving matrix games with payoffs of Atanassov's intuitionistic fuzzy (I-fuzzy) numbers. In this methodology, we define the concepts of I-fuzzy numbers and the value-index and ambiguity-index and develop a difference-index-based ranking method, which is proven to be a total order. By doing this, the parameterized nonlinear programming models are derived from a pair of auxiliary I-fuzzy mathematical programming models, which are used to determine solutions of matrix games with payoffs of I-fuzzy numbers. The validity and applicability of the models and method proposed in this paper are illustrated with a practical example. © 1993-2012 IEEE.

Lai Y.,Fuzhou University
Advanced Science Letters | Year: 2012

Multi-state storage capability of phase change random access memory (PRAM) is attracting increasing attentions for its potential mass storage without additional cost. In this work, the stacked-chalcogenide layers were fabricated by sequentially stacking the chalcogenide layers with different electrical conductivities, between which a metal layer acts as a barrier. Several resistance levels could be found on the resistance-voltage(R-V)curve, which indicates that the stacked chalcogenide layers exhibit multi-state storage capability. The internal metal barrier plays a positive role in the performance improvements. Except prevent the atomic interdiffusion between the adjacent chalcogenide layers, the metal barrier strengthens the resistance stability of the middle storage states and also adjusts the programming margins of the middle storage states by tuning barrier's thickness. Furthermore, we reveal that the improved performance is attributed to the positive influence of metal barrier on the thermal flux and the distribution of electrical potential in the stacked chalcogenide layers. © 2012 American Scientific Publishers All rights reserved.

Wang L.-L.,Dalian University of Technology | Li D.-F.,Fuzhou University | Zhang S.-S.,Dalian University of Technology
Journal of Intelligent and Fuzzy Systems | Year: 2013

Interval-valued intuitionistic fuzzy (IVIF) sets are a useful tool to deal with fuzziness inherent in decision data and decision making process. The aim of this paper is to develop a methodology for solving multiattribute decision making (MADM) with both ratings of alternatives on attributes and weights being expressed with IVIF sets. In this methodology, a weighted Euclidean distance between IF sets is defined using weights of IF sets. A pair of nonlinear programming models is constructed based on the concept of the relative closeness coefficients and the distance defined. Two simpler auxiliary nonlinear programming models are further derived to calculate the relative closeness coefficient intervals of alternatives to the IVIF positive ideal solution, which can be used to generate ranking order of alternatives based on the concept of likelihood of interval numbers. The method proposed in this paper is illustrated with a real example. © 2013 - IOS Press and the authors. All rights reserved.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

We investigate the geometric phase for a quantum field driven by an external source and subjected to spontaneous decay from coupling to the reservoir. Starting from a coherent state, we analyze the effect of decoherence when the system undergoes a nonadiabatic cyclic evolution in phase space, and show that the lowest correction to the conventional geometric phase is quadratic in the decaying rate of the quantum field. This is in distinct contrast with the nonadiabatic geometric phase associated with the evolution of a spin system subjected to spontaneous decay, which contains the first-order correction term. We further show that the unconventional geometric phase is also robust to field decay. ©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.

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.

Chen L.,Tongji University | Chen L.,Fuzhou University | Sun J.,Tongji University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2014

In this Letter, we firstly propose an epidemic network model incorporating two controls which are vaccination and treatment. For the constant controls, by using Lyapunov function, global stability of the disease-free equilibrium and the endemic equilibrium of the model is investigated. For the non-constant controls, by using the optimal control strategy, we discuss an optimal strategy to minimize the total number of the infected and the cost associated with vaccination and treatment. Table 1 and Figs. 1-5 are presented to show the global stability and the efficiency of this optimal control. © 2014 Elsevier Inc. All rights reserved.

In this paper, a scheme is presented for generation of W-type entangled states for n atoms trapped in separated cavities connected by optical fibers. The scheme only requires a single atom-cavity-fiber interaction and no classical field is needed. Due to these features, the scheme is simpler and more robust against decoherence than the previous ones. The scheme can also be used to realize quantum state transfer and controlled phase gates between qubits located at distant nodes of a quantum network. © World Scientific Publishing Company.

Xiao F.-X.,Fuzhou University
ACS Applied Materials and Interfaces | Year: 2012

In recent years, strenuous efforts have been devoted to exploring ZnO functionalized TiO2 nanotube arrays (ZnO/TNTs) nanocomposites; however, there is still a paucity of reports on the construction of well-defined ZnO/TNTs heterostructure via efficient and easily accessible approach. In this work, drawing on a two-step anodization combined pyrolysis strategy, we attained a highly ordered ZnO/TNTs hybrid nanostructure. Combined with a collection of characterizations including X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffusion reflectance spectrum (DRS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), we found that, in this coupling, in situ formed ZnO phases were uniformly grafted to TNTs framework giving rise to hybrid nanostructure, which is ascribed to cooperative interfacial interaction between polar TiO2 layer and ZnO precursor. The underlying interaction leading to judicious combination of TNTs and ZnO was unveiled by Fourier transformed infrared spectrum (FTIR) and XPS. Alternatively, it has been shown that ZnO nanocrystals distributed on the TNTs could serve as favorable hole channels and receptors for efficient separation of photoexcited charge carriers, which results in significantly enhanced photocatalytic performances of ZnO/TNTs heterostructure in comparison with pure TNTs, ZnO film, and P25 particulate film. Furthermore, it is found that the hybrid photocatalyst demonstrated excellent photostability. It is hoped that our work could present a straightforward paradigm for preparation of hierarchical semiconductor/1-D semiconductor heterostructures. © 2012 American Chemical Society.

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.

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.

Yu X.-Y.,Fuzhou University
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering | Year: 2015

The flexibility of the joints and links of space robots is considerable, arising from elasticity of the joints and links. Controlling such a robot is more complex than controlling rigid one due to the interactions of rigid and flexible motion. Only a single actuation signal could be applied at each joint, whilst it has to control the motion of the link joint, the flexure of both the joints itself, and the attached link for a flexible space robot. To investigate such an underactuated flexible-link flexible-joint space robot, a free-floating space manipulator with one flexible link and two flexible revolute joints was presented in this paper. The dynamical Lagrange equation was established, and a singularly perturbed model has been formulated. The model consisted of a rigid subsystem, a flexible-link fast subsystem, and a flexible-joint fast subsystem. Based on the two-time-scale separation of the manipulator dynamics, a reduced-order controller was designed. This controller consisted of a rigid control component and two fast control components. Based only on the possible bound of the uncertainty, an augmented robust control law was constructed for the rigid counterpart of the flexible-link flexible-joint robot. The flexible-joint fast subsystem controller would stabilize the elastic vibrations at the joints, and the flexible-link fast subsystem controller would damp out the vibration of the flexible link. Numerical simulations showed that the link and joint vibrations had been stabilized effectively with good tracking performance. © IMechE 2014.

Mohlmann L.,TU Berlin | Baar M.,TU Berlin | Riess J.,TU Berlin | Antonietti M.,Max Planck Institute for Chemistry | And 3 more authors.
Advanced Synthesis and Catalysis | Year: 2012

In this communication we describe the oxidative C-C bond formation of tertiary amines with various nucleophiles under very mild and environmental friendly conditions by using mesoporous graphitic carbon nitride (mpg-C 3N 4) semiconductor as a heterogeneous, metal-free photosensitizer in combination with visible light and oxygen as the terminal oxidation agent. This system can be further combined with proline- organocatalysis to achieve oxidative tandem photocatalysis, demonstrating a rich cascade of chemical possibilities of the current photosynthesis system. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zheng Y.-Y.,Fuzhou University
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2015

Graphene oxide nanoribbons(GONRs) were prepared through oxidative longitudinal unzipping of multiwalled carbon nanotubes, and then modified by silane coupling agent, KH-570. The functionalized GONRs(K-GONRs)/EVA composite films were subsequently obtained by solution coating method on a coating machine. Structures and properties of the K-GONRs/EVA composite films were characterized by FTIR, XRD, XPS, TEM, FE-SEM, oxygen transmission rate tester and electronic universal testing machine. The results show that the thin banded K-GONRs with interlayer spacing about 0.970nm are successfully prepared, and there is an increasing in interlayer distance about 0.095nm for K-GONRs when compared with original GONRs. Meanwhile, the prepared K-GONRs is neat and with uniform shape and low defect, dispersed evenly in EVA matrix. Comparing with the pure EVA films, when the mass fraction of K-GONRs is 1%, the oxygen transmission rate of K-GONRs/EVA composite films is reduced by 54.5% and the tensile strength is increased by 89.3%.The barrier property and mechanical properties of EVA is obviously improved. ©, 2015, Beijing Institute of Aeronautical Materials (BIAM). All right reserved.

Cheng S.,Fuzhou University | Conibeer G.,University of New South Wales
Thin Solid Films | Year: 2011

SnS films with thicknesses of 20-65 nm have been deposited on glass substrates by thermal evaporation. The physical properties of the films were investigated using X-ray diffraction (XRD), scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and ultraviolet-visible- near infrared spectroscopy at room temperature. The results from XRD, XPS and Raman spectroscopy analyses indicate that the deposited films mainly exhibit SnS phase, but they may contain a tiny amount of Sn2S3. The deposited SnS films are pinhole free, smooth and strongly adherent to the surfaces of the substrates. The color of the SnS films changes from pale yellow to brown with the increase of the film thickness from 20 nm to 65 nm. The very smooth surfaces of the thin films result in their high reflectance. The direct bandgap of the films is between 2.15 eV and 2.28 eV which is much larger than 1.3 eV of bulk SnS, this is deserving to be investigated further. © 2011 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.

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.

Chai Q.-Q.,Fuzhou University
Wuli Xuebao/Acta Physica Sinica | Year: 2015

Unknown time-varying parameters, including time-delay and system parameters, commonly exist in chaotic systems. These unknown parameters increase the difficulties in controlling the chaotic systems, and make most of the existing control methods fail to be applied. However, if these parameters can be estimated, they will facilitate the controller design. Therefore, in this paper, a parameter identification problem for a general time-delay chaotic system with unknown and time-varying parameters is considered, where these unknown time-delay and parameters are slow timevarying. It is very difficult to solve this problem analytically. Thus, a unified identification method is proposed to solve the identification problem numerically. To solve this identification problem, firstly, the time horizon is divided into several subintervals evenly. Then the time-varying parameters are approximated by piecewise constant functions. The height vectors of the piecewise constant functions are unknown and to be determined. Furthermore, the heights of the piecewise constant functions keep constant between each pair of the successive partition time points but switch values at the partition time points. After the approximation, the original identification problem for finding the nonlinear functions of the unknown parameters is transformed into a problem of selecting approximate parameter vectors, where the heights of the piecewise constan functions are unknown parameter vectors to be determined. Secondly, to solve the problem of selecting approximate parameter vectors quickly, the partial gradients of the objective function with respect to the parameter vectors are derived; and they are then integrated with a gradient-based procedure to obtain the unknown heights. As the number of partitions for the piecewise function increases, the optimal results of the approximate problem will approach to the optimal results of the original parameter identification problem. Hence, the optimal piecewise functions will approach to the real nonlinear functions for the unknown parameters. Finally, parameter identification experiments on time-delayed Mackey-Class and time-delayed logistic chaotic systems are carried out. The effects of the partition number on the estimated results are discussed. Numerical results demonstrate that when some switching times of the unknown parameters do not coincide with any partition time points, small error between the estimated results and the real values are present. However, these errors can be filtered and the estimated results are consistent well with the real values. Hence, the proposed method is reasonable and effective. © 2015 Chinese Physical Society.

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.

Xu H.-Q.,Fuzhou University
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2015

The quality of Landsat 8 sensor data has been improved after a series of corrections and data reprocessing since its successful launch on February 11, 2013. These include the correction of all calibration parameters, the improvement of the radiance conversion coefficients for the all Operational Land Imager (OLI) sensor bands, the refinement of the OLI detector linearization, the radiometric offset correction for the two Thermal Infrared Sensor (TIRS) bands, the slight improvement to the geolocation of the TIRS data, and the reprocessing of all Landsat 8 data held in the USGS archives. In addition, several algorithms specially developed for Landsat 8 data have also been proposed over the pass year. This paper aims to assess the accuracy of the retrieved the reflectance of the OLI sensor and the land surface temperature (LST) of the TIRS sensor of the new satellite with those of the well-calibrated Landsat 7 ETM+ sensor and the ground-measured LST. This study retrieved the top of the atmosphere (TOA) reflectance of the OLI multispectral bands and the LST of the TIRS thermal bands with the most recent calibration parameters, algorithms and USGS-processed Landsat 8 image data. In addition, the Chavez's COST model has been introduced to correct the atmospheric effects on the OLI multispectral bands. To examine the performance of the calibration parameters and the developed algorithms, the retrieved TOA reflectance of each multispectral band and the computed LST of the thermal infrared bands have been compared with that of the corresponding band of the synchronized, well-calibrated Landsat 7 data and the in situ LST, respectively. The results show that the current Landsat 8 calibration parameters of multispectral bands can achieve high accuracy for the retrieval of TOA reflectance. The proposed COST-based atmospheric correction algorithm can also have a nearly identical performance when compared with the Landsat 7 COST model's result. Nevertheless, two recently-proposed split window algorithms for computing the LST from Landsat 8 thermal infrared bands did not perform well, as they offered a large difference between the algorithm-modeled LST and the ground-measured LST. Given the scaling parameters of the TIRS thermal infrared band 11 is still unstable, as announced by the Landsat 8 project team, it is recommended that at this stage users might use the single channel (SC) algorithm of Jiménez-Muñoz and Sobrino to retrieve the LST from Landsat 8 thermal band 10 (like working on Landsat TM/ETM+ band 6) rather than attempt a split-window algorithm using both TIRS bands 10 and 11. However, care should be taken in the selection of correct atmosphere parameters for the SC-based LST computing, especially when a very high atmospheric water vapor condition occurs. ©, 2015, Science Press. All right reserved.

Wang Y.-M.,Fuzhou University | Wang Y.-M.,City University of Hong Kong | Chin K.-S.,City University of Hong Kong
Expert Systems with Applications | Year: 2010

Cross-efficiency evaluation has long been suggested as an alternative method for ranking decision making units (DMUs) in data envelopment analysis (DEA). This paper proposes a neutral DEA model for cross-efficiency evaluation. Unlike the aggressive and benevolent formulations in cross-efficiency evaluation, the neutral DEA model determines one set of input and output weights for each DMU from its own point of view without being aggressive or benevolent to the other DMUs. As a result, the cross-efficiencies computed in this way are more neutral, neither aggressive nor benevolent. The neutral DEA model is then extended to a cross-weight evaluation, which seeks a common set of weights for all the DMUs. Numerical examples are provided to illustrate the applications of the neutral DEA model and the cross-weight evaluation in DEA ranking. © 2009 Elsevier Ltd. All rights reserved.

Wang Y.-M.,Fuzhou University | Chin K.-S.,City University of Hong Kong
Expert Systems with Applications | Year: 2010

Two-stage data envelopment analysis (DEA) has been researched by a number of authors. In a recent paper by Kao and Hwang (2008), the overall efficiency of two-stage process was defined as the product of the efficiencies of two individual stages. In a more recent paper by Chen, Cook, Li, and Zhu (2009), the overall efficiency of two-stage process was modeled as a weighted sum of the efficiencies of two individual stages. This paper looks into further two-stage DEA and proposes some alternative DEA models for two-stage process to show that (i) the overall efficiency of two-stage process can also be modeled as a weighted harmonic mean of the efficiencies of two individual stages; (ii) the two-stage DEA model of Kao and Hwang (2008) can be easily extended to variable returns to scale (VRS) assumption; and (iii) the additive efficiency decomposition model of Chen et al. (2009) can be generalized to taking into account the relative importance weights of two individual stages. Numerical illustrations are provided to show the potential applications of the proposed new DEA models. © 2010 Elsevier Ltd. All rights reserved.

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.

Yang F.,Nankai University | Lin Z.,Fuzhou University | He X.,Nankai University | Chen L.,Nankai University | And 2 more authors.
Journal of Chromatography A | Year: 2011

A macroporous boronate affinity monolithic column was prepared and applied to specifically capture glycoproteins using metal-organic gels (MOGs) as a porogenic template. This newly explored application of MOGs has proven to be a more convenient method for the formation of macropores in contrast to traditional porogenic methods. The poly (3-acrylamidophenylboronic acid-co-ethylene dimethacrylate) monolithic columns were synthesized in stainless columns by in situ polymerization. To fabricate the macroporous formation with a uniformed open-channel network, the preparation conditions, such as reaction temperature, the concentration of the MOGs and the ratio of monomers were systematically investigated. The prepared macroporous monoliths were characterized by scanning electron microscope (SEM) and mercury intrusion porosimetry. Furthermore, horseradish peroxidase (HRP) and transferrin (TF) were chosen as test glycoproteins, and the chromatographic analysis demonstrated that the macroporous boronate affinity monoliths exhibited a higher selectivity and better dynamic binding capacity toward glycoproteins compared with non-glycoproteins. The resulted affinity monolithic column was successfully employed to specifically capture TF from a bovine serum sample. © 2011 Elsevier B.V.

Ma Z.N.,Fuzhou University
Xi bao yu fen zi mian yi xue za zhi = Chinese journal of cellular and molecular immunology | Year: 2011

To prepare and characterize the mouse monoclonal antibodies against Vibrio parahaemolyticus OmpW. The OmpW amino acid sequence from three diseased Vibrio was analyzed by Bioinformatics. Mice were immunized with r-OmpW which was highly expressed and purified in E.coli. Five Vibrio(Va, Vp, Vh, Vv, Van) were chosen as antigen for mAb selection.The characters of the anti-OmpW monoclonal antibodies were studied by Western blot, Flow Cytometry, indirect immunofluorescence. OmpW was testified a highly conservative membrane protein.Three clones of anti-OmpW mAb was obtained. The Ig subclass of the mAb secreted from fused cell S5C10 was IgG3, which of the titer was 4.6×10(4);. The mAb could specifically recognize Vibrio parahaemolyticus, Vibrio alginolyticus, Vibrio harveyi, Vibrio anguillarum, Vibrio vulnificus, which could not react with Pseudomonas flurosecens, Aeromonas hydrophila, Aeromonas sobria, Aeromonas hydrophila, Escherichia coli. The mAb could specially recognize five diseased Vibrio, which is a useful tool for the further study of the diagnosis of Vibrio.

Li D.-F.,Fuzhou University | Wan S.-P.,Jiangxi University of Finance and Economics
Applied Soft Computing Journal | Year: 2013

In the classical Linear Programming Technique for Multidimensional Analysis of Preference (LINMAP), the decision maker (DM) gives the pair-wise comparisons of alternatives with crisp truth degree 0 or 1. However, in the real world, DM is not sure enough in all comparisons and can express his/her opinion with some fuzzy truth degree. Thus, DM's preferences are given through pair-wise comparisons of alternatives with fuzzy truth degrees, which may be represented as trapezoidal fuzzy numbers (TrFNs). Considered such fuzzy truth degrees, the aim of this paper is to develop a new fuzzy linear programming technique for solving multiattribute decision making (MADM) problems with multiple types of attribute values and incomplete weight information. In this method, TrFNs, real numbers, and intervals are used to represent the multiple types of decision information. The fuzzy consistency and inconsistency indices are defined as TrFNs due to the alternatives' comparisons with fuzzy truth degrees. Hereby a new fuzzy linear programming model is constructed and solved by the possibility linear programming method with TrFNs developed in this paper. The fuzzy ideal solution (IS) and the attribute weights are then obtained. The distances of alternatives from the fuzzy IS can be calculated to determine their ranking order. The implementation process of the method proposed in this paper is illustrated with a strategy partner selection example. The comparison analyzes show that the method proposed in this paper generalizes the classical LINMAP, fuzzy LINMAP and possibility LINMAP. © 2012 Elsevier B.V. All rights reserved.

Jiang S.-F.,Fuzhou University | Zhang C.-M.,Northeastern University China | Zhang S.,Shenyang Jianzhu University
Expert Systems with Applications | Year: 2011

It is proposed in this paper a novel two-stage structural damage detection approach using fuzzy neural networks (FNNs) and data fusion techniques. The method is used for structural health monitoring and damage detection, particularly for cases where the measurement data is enormous and with uncertainties. In the first stage of structural damage detection, structural modal parameters derived from structural vibration responses are fed into an FNN as the input. The output values from the FNN are defuzzified to produce a rough structural damage assessment. Later, in the second stage, the values output from three different FNN models are input directly to the data fusion center where fusion computation is performed. The final fusion decision is made by filtering the result with a threshold function, hence a refined structural damage assessment of superior reliability. The proposed approach has been applied to a 7-degree of freedom building model for structural damage detection, and proves to be feasible, efficient and satisfactory. Furthermore, the simulation result also shows that the identification accuracy can be boosted with the proposed approach instead of FNN models alone. © 2010 Elsevier Ltd. All rights reserved.

The purpose of this paper is to develop the concept and mathematical-programming methodology of matrix games with payoffs represented by Atanassovs interval-valued intuitionistic fuzzy (IVIF) sets. In this methodology, the concept of solutions of matrix games with payoffs represented by Atanassovs IVIF sets is defined, and some important properties are studied using multiobjective-programming and duality-programming theory. It is proven that each matrix game with payoffs represented by Atanassovs IVIF sets has a solution, which can be obtained through solving a pair of auxiliary linear/nonlinear-programming models derived from a pair of nonlinear biobjective interval-programming models. Validity and applicability of the proposed methodology are illustrated with a numerical example. © 2006 IEEE.

For thermal transport in one-dimensional (1D) systems, recent studies have suggested that employing different theoretical models and different numerical simulations under different system's parameter regimes might lead to different universality classes of the scaling exponents. In order to well understand the universality class(es), here we perform a direct dynamics simulation for two archetype 1D oscillator systems with quite different phonon dispersions under various system's parameters and find that there is a crossover between the different universality classes. We show that by varying anharmonicity and temperatures, the space-time scaling exponents for the systems with different dispersions can be feasibly tuned in different ways. The underlying picture is suggested to be understood by phonons performing various kinds of continuous-time random walks (in most cases, be the Lévy walks but not always), probably induced by the peculiar phonon dispersions along with nonlinearity. The results and suggested mechanisms may provide insights into controlling the transport of heat in some 1D materials. Copyright © EPLA, 2016.

Huang Y.,Fuzhou University
Applied Mechanics and Materials | Year: 2012

To ensure the personnel safety in tunnel construction, we researched the vault sink automatic measurement technology, surrounding rock displacement automatic measurement technology, the video surveillance technology and the wireless position management technology of the personnel into the tunnel. The techniques and keys are discussed. The measurement data of these techniques combined to a unified software platform. Combined with the wireless communication network to realize the mobile phone short message alarm, using the computer internet to realize the remote query and control, we achieve the automation, informatization, network and intelligent management to ensure the safety of the tunnel construction. © (2012) Trans Tech Publications, Switzerland.

Interval-valued intuitionistic fuzzy (IVIF) sets are useful to deal with fuzziness inherent in decision data and decision-making processes. The aim of this paper is to develop a nonlinear-programming methodology that is based on the technique for order preference by similarity to ideal solution to solve multiattribute decision-making (MADM) problems with both ratings of alternatives on attributes and weights of attributes expressed with IVIF sets. In this methodology, nonlinear-programming models are constructed on the basis of the concepts of the relative-closeness coefficient and the weighted-Euclidean distance. Simpler auxiliary nonlinear-programming models are further deduced to calculate relative-closeness of IF sets of alternatives to the IVIF-positive ideal solution, which can be used to generate the ranking order of alternatives. The proposed methodology is validated and compared with other similar methods. A real example is examined to demonstrate the applicability and validity of the methodology proposed in this paper. © 2010 IEEE.

Gao S.,Harbin Institute of Technology | Guo L.,Harbin Institute of Technology | Wu Z.,Fuzhou University | Zhang S.,Harbin Institute of Technology
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

In order to study the behavior of composite frame under column loss, a 4-span, single-story steel-concrete frame was fabricated. The specimen was tested under middle-column loss. The experimental results show that, the progressive collapse of composite frame under middle column loss involves six stages consisting of elastic stage, elastic-plastic stage, arch stage, plastic stage, transient stage and catenary stage, in which the structure sustains and redistributes loads through the mechanism of hinge action and catenary action; composite beam could bridge over the remaining elements and assure the formation of catenary action while arch action could enhance the resistance of structure under column loss; the composite frame designed according to current design standard possesses good progressive collapse resistance under the failure of key column. Based on the test, a finite element model was developed, whose results were validated by comparing with the experimental results. This model provides an efficient modelling method on progressive collapse analysis of high-rise buildings. Based on the experimental phenomena and results, a new type of 'truss-spring' arch model was proposed to study the arch action in composite frame. The vertical displacement-load relationship formula and the vertical displacement-horizontal displacement relationship formula were derived. The accuracy of these two formulae is validated by comparing with the tests results.

Li D.-F.,Fuzhou University
Mathematical and Computer Modelling | Year: 2011

The aim of this paper is to develop a methodology for solving multiattribute decision making (MADM) problems in which weights of attributes and ratings of alternatives on qualitative and quantitative attributes are expressed with intuitionistic fuzzy sets (IFSs). In this methodology, relative membership/satisfaction and non-membership/non-satisfaction degrees are formulated to construct IFSs for numerical values of alternatives on quantitative attributes. Alternatives on qualitative attributes are evaluated using linguistic variables and semantics which are parameterized by IFSs. Hereby, weights and ratings of alternatives on both qualitative attributes and quantitative attributes may be expressed with IFSs in a unified way. The generalized ordered weighted averaging (GOWA) operator is further extended to the situations in which the argument values are IFSs and thus a methodology is developed to solve MADM problems using IFSs. Validity and applicability of the proposed methodology in this paper are illustrated with a real numerical example. © 2010 Elsevier Ltd.

Fan X.L.,Northwestern Polytechnical University | Sun C.C.,Northwestern Polytechnical University | Zhang Y.F.,Fuzhou University | Lau W.M.,University of Western Ontario
Journal of Physical Chemistry C | Year: 2010

The adsorption of ethylene on the Ge(001) surface is investigated by the first principles density-functional calculations. Our total energy calculations and reaction path investigations clarify the relative importance of various adsorption configurations at 0.5 and 1.0 monolayer adsorption coverage. The results are consistent with the experimental data in the literature in that both the di-σ and paired-end-bridge configurations are the favorable structures on Ge(001). In addition, our calculation results clarify that having di s-bound ethylene and end-bridge-bound ethylene next to each other is unfavorable. Such new results imply that although di- σ-bound ethylene and end-bridge-bound ethylene may coexist on Ge(001), phase separation will occur to form adsorbate domains. The electronic structures have also been studied, and the band structure calculations show that both the di-s and end-bridge models at 0.5 monolayer are semiconducting with a small band gap of ∼0.4 eV, which is slightly larger than the band gap of the virgin Ge(001) p(2 × 2) surface. Increasing the coverage to 1.0 monolayer further widens the band gap in both cases. The results thus rule out the past postulation that ethylene adsorption may turn Ge(001) to metallic. Copyright © 2010 American Chemical Society.

Xia Y.,Fuzhou University | Zheng W.X.,University of Western Sydney
Automatica | Year: 2015

This paper proposes a new method for estimating the parameters of an autoregressive (AR) signal from observations corrupted by white noise. The feature of the new method is that the observation noise variance estimate is converted into the only solution of a nonlinear equation to yield unbiased estimate of the AR parameters. Moreover, a convergent Newton iterative algorithm with a deterministic initial point is presented for efficient implementation of the proposed new estimation method. As a result, the proposed new method can minimize the error of estimating the variance of the observation noise. Since more accurate estimates of this observation noise variance can be attained at earlier stages, the proposed method can achieve a good performance in estimating the AR signal parameters. Numerical results demonstrate that the proposed new algorithm is more effective in terms of accuracy and robustness against noise than conventional algorithms. © 2015 Elsevier Ltd.

Li D.-F.,Fuzhou University | Wan S.-P.,Jiangxi University of Finance and Economics
Knowledge-Based Systems | Year: 2014

Considering various situations and characteristics of supply chain management, we regard the outsourcing provider selection as a type of fuzzy inhomogenous multiattribute group decision making (MAGDM) problems with fuzzy alternatives' comparisons and incomplete weight information. Hereby we focus on developing a new fuzzy linear programming method for solving such MAGDM problems. In this method, the decision makers' preferences are given through pair-wise alternatives' comparisons with fuzzy truth degrees represented as trapezoidal fuzzy numbers (TrFNs). Intuitionistic fuzzy sets, TrFNs, intervals and real numbers are used to express the inhomogenous decision information. Under the condition that the fuzzy positive ideal solution (PIS) and fuzzy negative ideal solution (NIS) are known, the fuzzy consistency and inconsistency indices are defined on the basis of the relative closeness degrees and expressed with TrFNs. The attribute weights are estimated through constructing a new fuzzy linear programming model, which is solved by the developed method of fuzzy linear programming with TrFNs. Through solving the constructed linear goal programming model, we obtain the collective comprehensive relative closeness degrees of alternatives to the fuzzy PIS, which are used to rank the alternatives. The effectiveness of the proposed method is verified with an example of IT outsourcing provider selection. © 2014 Elsevier B.V. All rights reserved.

Xia Y.,Fuzhou University | Leung H.,University of Calgary
Information Sciences | Year: 2014

Data fusion is widely used in biometric, multi-media signal and image processing, and wireless sensor networks. Optimal fusion techniques are developed to perform fusion under noisy environments. However, the statistical analysis carried out to evaluate the relative merits of these optimal methods is very less. The aim of this paper is to fill this gap by evaluating four statistical optimal data fusion methods namely, the linearly constrained least squares (LCLS) fusion method, the covariance intersection (CI) fusion method, the linearly constrained least absolute deviation (CLAD) fusion method, and the constrained least square (CLS) fusion method. The CLS fusion method presented here is an improved version of the CLAD fusion method. We further analyze the performances of these four methods in terms of optimality, unbiased estimation, robustness, and complexity. Simulations are used to validate the performance of these fusion algorithms. © 2014 Elsevier Inc. All rights reserved.

Wu Z.-X.,Lanzhou University | Yang H.-X.,Fuzhou University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

We study the evolution of cooperation in the evolutionary spatial prisoner's dilemma game (PDG) and snowdrift game (SG), within which a fraction α of the payoffs of each player gained from direct game interactions is shared equally by the immediate neighbors. The magnitude of the parameter α therefore characterizes the degree of the relatedness among the neighboring players. By means of extensive Monte Carlo simulations as well as an extended mean-field approximation method, we trace the frequency of cooperation in the stationary state. We find that plugging into relatedness can significantly promote the evolution of cooperation in the context of both studied games. Unexpectedly, cooperation can be more readily established in the spatial PDG than that in the spatial SG, given that the degree of relatedness and the cost-to-benefit ratio of mutual cooperation are properly formulated. The relevance of our model with the stakeholder theory is also briefly discussed. © 2014 American Physical Society.

Yang H.-X.,Fuzhou University | Zhou T.,University of Electronic Science and Technology of China | Huang L.,Lanzhou University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

We propose a dynamic model for a system consisting of self-propelled agents in which the influence of an agent on another agent is weighted by geographical distance. A parameter α is introduced to adjust the influence: The smaller value of α means that the closer neighbors have a stronger influence on the moving direction. We find that there exists an optimal value of α leading to the highest degree of direction consensus. The value of optimal α increases as the system size increases, while it decreases as the absolute velocity, the sensing radius, and the noise amplitude increase. © 2014 American Physical Society.

Yang H.-X.,Fuzhou University | Tang M.,University of Electronic Science and Technology of China
Physica A: Statistical Mechanics and its Applications | Year: 2014

The design of routing strategies for networks of mobile nodes has received increasing attention in recent years. In this paper, we propose an adaptive routing strategy that incorporates geographical distance with local traffic information through a tunable parameter h. It is found that there exists an optimal value of h, leading to the maximum traffic throughput of the network. The optimal value of h decreases as the moving speed increases and increases as the communication radius increases. The dependence of the throughput on the moving speed and the communication radius is also studied. Our results show that for a wide range of the parameters, the throughput decreases as the moving speed increases. However, when the value of the parameter is set to be one, the maximum throughput is obtained at a moderate speed. Moreover, we find that the throughput increases with the communication radius.© 2014 Elsevier B.V. All rights reserved.

Shao Z.-Q.,Fuzhou University
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2014

This paper is concerned with the asymptotic behavior of global C1 solutions of the Goursat problem for quasilinear hyperbolic systems. Based on the existence result on the global classical solution, we prove that when t tends to the infinity, the solution approaches a combination of Lipschitz continuous and piecewise C1 traveling wave solutions, provided that the C1 norm of the boundary data is bounded but possibly large, and the BV norm of the boundary data is sufficiently small. Applications include the 1D compressible Euler equations for Chaplygin gases. © 2013 Springer Basel.

We propose an efficient scheme to realize quantum state transfer (QST) in coupled cavities. An important advantage is that QST can be completed via quantum Zeno dynamics. During the process, the cavity fields are only virtually excited, which makes our protocol robust against the cavity decay. This scheme may provide useful applications in solid-state quantum information processing (QIP). © © 2014 The Royal Swedish Academy of Sciences.

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.

Lin L.-H.,Fuzhou University
International Journal of Theoretical Physics | Year: 2014

We propose scheme for transferring quantum state between any pair of nodes in a quantum network. Each node consists of an atom and a cavity, with the atom acting as the quantum bit. Any two adjacent nodes are connected by an optical fiber. During the operation neither the atomic system nor the fibers are excited, which is important in view of decoherence. Under certain conditions, the probability that the cavities are excited is negligible. The method has an inherent robustness against the fluctuation perturbations in the classical control parameters and the randomness in the atomic position. The scheme can be generalized to implement quantum phase gate between any two remote qubits. © 2013, Springer Science+Business Media New York.

Zhou X.,City University of Hong Kong | Li Y.F.,City University of Hong Kong | He B.,Fuzhou University
Pattern Recognition | Year: 2013

Multi-target visual tracking is a challenge because of data association and mutual occlusion in the interacting targets. This paper presents a Gaussian mixture probability hypothesis density based multi-target visual tracking system with game-theoretical occlusion handling. Firstly, the spatial constraint based appearance model with other interacting targets' interferences is modeled. Then, a two-step occlusion reasoning algorithm is proposed. Finally, an n-person, non-zero-sum, non-cooperative game is constructed to handle the mutual occlusion problem. The individual targets within the occlusion region are regarded as the players in the constructed game to compete for the maximum utilities by using the certain strategies. A Nash Equilibrium of the game is the optimal estimation of the locations of the players within the occlusion region. Experiments on video sequences demonstrate the good performance of the proposed occlusion handling algorithm. © 2013 Elsevier Ltd. All rights reserved.

Chen L.,Tongji University | Chen L.,Fuzhou University | Sun J.,Tongji University
Physica A: Statistical Mechanics and its Applications | Year: 2014

In this paper, we consider an SIRS epidemic model with vaccination on heterogeneous networks. By constructing suitable Lyapunov functions, global stability of the disease-free equilibrium and the endemic equilibrium of the model is investigated. Also we firstly study an optimally controlled SIRS epidemic model on complex networks. We show that an optimal control exists for the control problem. Finally some examples are presented to show the global stability and the efficiency of this optimal control. These results can help in adopting pragmatic treatment upon diseases in structured populations. © 2014 Elsevier B.V. All rights reserved.

Wang S.,Fuzhou University
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

Three models of 3D cast-in-place RC frame structures are simulated in ABAQUS. In the three models, one represents the actual RC frame structure with monolithic slab, one represents the open frame structure used in structural design currently, which means truss structure at the stage of calculating internal forces of frame beams and columns, and the third one represents the open frame structure which takes into account some slab reinforcement in the rectangle section of frame beam to consider the slab participation in the flexural capacity of frame beam. By investigating the failure mode of these three models, the development of plastic hinges, the reinforcement stress of beam, column and slab in the models, the influence of monolithic slab to the bending resistance of beam end is studied. It shows that the existence of slab makes the failure mode of actual RC frame structure different from the design criteria of strong column weak beam. It also indicates that the slab participation in the bending resistance of beam end is not only expressed in the slab reinforcement but also in the structure integral performance. Besides, when using the effective flange width to consider the slab reinforcement participation, the structure integral performance, lateral displacement and other relevant factors should be taken into account.

Li D.,Fuzhou University | Koike M.,Tohoku University | Chen J.,Tohoku University | Nakagawa Y.,Tohoku University | Tomishige K.,Tohoku University
International Journal of Hydrogen Energy | Year: 2014

Ni-Cu/Mg/Al bimetallic catalysts were prepared by the calcination and reduction of hydrotalcite-like compounds containing Ni2+, Cu 2+, Mg2+, and Al3+, and tested for the steam reforming of tar derived from the pyrolysis of biomass at low temperature. The characterizations with XRD, STEM-EDX, and H2 chemisorption confirmed the formation of Ni-Cu alloy particles. The Ni-Cu/Mg/Al bimetallic catalyst with the optimum composition of Cu/Ni = 0.25 exhibited much higher catalytic performance than the corresponding monometallic Ni/Mg/Al and Cu/Mg/Al catalysts in the steam reforming of tar in terms of activity and coke resistance. The catalyst gave almost total conversion of tar even at temperature as low as 823 K. This high performance was related to the higher metal dispersion, larger amount of surface active sites, higher oxygen affinity, and surface modification caused by the formation of small Ni-Cu alloy particles. In addition, the Ni-Cu/Mg/Al catalyst showed better long-term stability than the Ni/Mg/Al catalyst. No obvious aggregation and structural change of the Ni-Cu alloy particles were observed. The coke deposition on the Ni-Cu/Mg/Al catalyst was approximately ten times smaller than that on the Ni/Mg/Al catalyst, indicating good coke-resistance of the Ni-Cu alloy particles. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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.

Lin L.-H.,Fuzhou University
Chinese Journal of Physics | Year: 2012

We propose a scheme for the generation of entangled coherent states for two separate cavities connected by an optical fiber. In the scheme, an atom is trapped in the first cavity and driven by a strong classical field. Under the condition that the cavity-fiber coupling is much larger than the atom-cavity coupling, the two cavity modes evolve from a vacuum state to entangled coherent states correlated with the atomic states. During the evolution, the fiber mode is not excited and the fiber loss does not affect the fidelity of the produced state. © 2012 THE PHYSICAL SOCIETY OF THE REPUBLIC OF CHINA.

Chen H.,Fuzhou University
International Journal of Computational Intelligence Systems | Year: 2015

Enterprises nowadays are often confronted with selecting supplier collaborative configuration problems in supply chain management. The aim of this paper is to develop a group selection methodology with the correlation of experts and attributes for solving supplier collaborative configuration problems. In this methodology, opinions of experts for supplier collaborative configuration on the basic attributes are integrated, respectively. The Denoeux cautious combination rules are further modified to delete the ignorance caused by relative weights in the aggregation and hereby we estimate the group evaluations of supplier collaborative configuration, which are used to rank supplier collaborative configuration schemes/alternatives through employing the minimum/maximum regret value method. A real case is used to verify and show the rationality, effectiveness and applicability. © 2015 the authors.

Most of the recent results on the leader-following rendezvous problem focus only on the deterministic multi-agent systems without external disturbances and plant uncertainties. In this paper, we will present a novel distributed internal model approach to further study the leader-following rendezvous problem for double-integrator multi-agent systems subject to both external disturbances and plant uncertainties. We provide both the distributed full state feedback control and the distributed partial state feedback control without velocity measurement. In both control schemes, we will give the suitable distributed internal model to convert the rendezvous problem into the stabilization problem with connectivity preserving for their augmented systems. We stabilize the corresponding augmented systems by the high gain feedback control based on a new potential function. Comparing with some recent results, our design can handle a large class of reference signals, external disturbances, and plant uncertainties. © 2015 Elsevier Ltd.

Zheng Y.-Q.,Fuzhou University
Chinese Journal of Biologicals | Year: 2016

Objective To prepare fish peptone and analyze its quality. Methods The leftovers during process of surimi were ground and degreased, and the obtained oar was digested with 0. 1% papain, of which the supernatant (fish peptone digest) was collected by centrifugation, de-salted with a 300 Da nanofiltration membrane, concentrated then dried by nebulization to obtain fish peptone sample FZU01 in a form of light yellow powder. Both the sample FZU01 and fish powder protein were tested for main physiochemical indexes, including clarity, nitrite and basic precipitations, acidity and alkalinity, nitrogen content, amino nitrogen, loss on drying and ignition residue. LB media were prepared with the two kinds of peptones respectively at the same yeast extract and sodium chloride concentrations, initial pH value and inoculum concentrations, and inoculated with E. coli, of which the A 600 values were determined. The relative molecular masses of two peptones were determined by size-exclusion high-performance liquid chromatography (SEC-HPLC). E. coli was added with 50, 150, 300, 600, 900, 1 200 and 1 500 mg/L histamine and 0. 1, 0. 5, 1. 0, 5. 0, 10. 0, 20. 0, 30. 0, 40. 0 and 50. 0 mg/L heavy metal ions (Hg2+, Cd2+, As3+, Cr5+ and Pb2+) respectively, cultured at 37 °C for 12 h and determined for A an value. Results All the physiochemical indexes of two peptones met the Standard for Quality Control of Main Raw and Auxiliary Materials for Biologies in China, of which the acidity and alkalinity, nitrogen content, amino nitrogen, loss on drying and ignition residue showed no significant difference (P > 0. 05). The relative molecular masses of 92. 5% of FZU01 were less than 1 000. The relative molecular masses of a major of fish powder peptone were 10 000, while those of 56. 1% were less than 1 000. The growth rate of E. coli in FZU01 group increased significantly as compared with that in fish powder peptone group (P < 0. 05). However, the inhibiting rate to growth of E. coli was positively related to the histamine concentration, with an IC50 of 257. 3 mg/L. The histamine at a concentration of more than 600 mg/L inhibited the growth of E. coli completely. The inhibiting rate of growth of E. coli was positively related to the heavy metal ion concentration. The IC50 of Hg2+, Cd2+, As3+, Cr6+ and Pb2+ to E. coli were 1. 35, 4. 67, 7. 37, 11. 04 and 20. 19 mg/L respectively. Conclusion Relative molecular mass, histamine and heavy metal ion may be used as the important parameters for quality control of peptone product, of which the concentrations should be control within a specified range to ensure the stability and safety of the product.

Lin D.,Fuzhou University
Zhongguo zhen jiu = Chinese acupuncture & moxibustion | Year: 2012

To explore the many links that impact acupuncture-moxibustion effect and to analyze the questions existed in the clinical research methodology in terms of the research direction and characteristics of acupuncture and moxibustion, so as to propose the features of multi-factor complex in the research on the clinical effects of acupuncture and moxibustion. Eventually, a set of perfect methodology can be established for the clinical research of acupuncture and moxibustion on the basis of multivariate statistical analysis.

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.

Yang F.G.,Fuzhou University | You Z.Y.,CAS Fujian Institute of Research on the Structure of Matter | Tu C.Y.,CAS Fujian Institute of Research on the Structure of Matter
Laser Physics Letters | Year: 2012

The ZnWO 4:Tm 3+ single crystal has been grown by Czochralski method and the concentration of Tm 3+ is 0.2 at.%. End-wing -pumping ZnWO 4:Tm 3+ crystal by 795 nm LD, we obtain a novel ~ 1.9 μ m eye-safe laser. At different temperatures, the laser output versus pump power is measured. At 283 K, the highest output power is up to 240 mW and the slope efficiency is 1.7%. By means of the quasi-three energy level theory, we investigate the optimized crystal length. Results indicate that the slice laser system is more suitable for the end pumping ZnWO 4:Tm 3+ crystal. © 2012 by Astro Ltd., published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA.

Ma L.A.,Fujian University of Technology | Guo T.L.,Fuzhou University
Ceramics International | Year: 2013

High-quality ZnO tetrapods with different morphologies were synthesized via thermal evaporation of a surface-modified Zn powder in an oxygen/argon mixed gas. The morphology, including the size and shape of the individual legs of ZnO tetrapods, was, easily altered by adjusting the proportion of oxygen in the carrier gas and the reaction temperature of the furnace. A correlation between the experimental parameters and the product morphologies was proposed and discussed. Moreover, the influence of the deposition time on the field emission (FE) characteristics of ZnO-tetrapod cathodes fabricated by the electrophoretic deposition (EPD) method was investigated. The results show that ZnO-tetrapod cathodes grown for 15 min have the best field emission properties, with a turn-on field of 2.01 V/μm, a threshold field of ∼3.8 V/μm, a current density of 1.96 mA/cm2 at a field of ∼4.62 V/μm, and a field enhancement factor as high as 1.1×104. The low threshold field and marked enhancement in β were attributed to the small radius of curvature, the high aspect ratio, and, perhaps more importantly, the proper density distribution of ZnO tetrapods. © 2013 Elsevier Ltd and Techna Group S.r.l.

Huang Y.,CAS Fujian Institute of Research on the Structure of Matter | Guo Y.,Fuzhou University | Wang Y.,CAS Fujian Institute of Research on the Structure of Matter
Journal of Power Sources | Year: 2014

Partial substitution of Cu by Pd2+ ions and Bi3+ ion self-adsorption processes are used to fabricate a novel core-shell PdCuBi nanocatalyst. X-ray diffraction, transmission electron microscope, energy-dispersive X-ray spectra and different electrochemical measurements are used to characterize the catalyst. It is exhibited that Pd covers Cu outer layers in the substitution reaction and Bi modifies Pd surface in the adsorption process. The peak current for ethylene glycol electrooxidation of PdCuBi/C (171.1 mA cm-2) in a KOH solution is almost three times higher than that of Pd/C (57.8 mA cm-2). Durability and tolerance towards strongly adsorbed intermediate poisoning of this catalyst are also improved. © 2013 Elsevier B.V. All rights reserved.

MgO nanowires are synthesized at a lower temperature (T=600°C) by pulsed liquid injection metal-organic chemical vapor deposition with Mg(C 11H 19O 2) 2 (magnesium bis (2, 2, 6, 6-tetramethyl-3, 5-heptanedionate)) as precursor. The MgO nanowires grow along the [001] direction with gold nanoparticles on the tips, which leads to the vapor-liquid-solid growth mechanism. The growth mode of nanowires (vertical growth to the substrate or parallel growth to the substrate) can be controlled by adjusting the injection period or the injection mass/period. © 2010 Chin. Phys. Soc.

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.

Zhao Q.,Fuzhou University | Wu C.,Tongji University
Gongcheng Lixue/Engineering Mechanics | Year: 2012

In order to take into account the change of stress and deformation during the whole process of welding and the thermal field distribution of a U-rib stiffened plate, a thermal elastic-plastic FEM model was adopted and element birth and death was used to simulate the weld seam fill-in and heat input. And the residual stress distribution was investigated by numerical simulations and experiments. The comparison of numerical analyses and experimental results of distribution and magnitude of residual stress showed that residual stress near the weld seam is close to material yielding stress, the average value of the residual stress far from weld seam on the mother board was around 0.2 time of material yielding stress. The residual stress distribution tendency derived from numerical simulation was close to the experiment result, which proved the validity of the numerical simulation.

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.

Yang H.-X.,Fuzhou University | Wu Z.-X.,Lanzhou University | Wang B.-H.,Hefei University of Technology
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

The interplay between traffic dynamics and epidemic spreading on complex networks has received increasing attention in recent years. However, the control of traffic-driven epidemic spreading remains to be a challenging problem. In this Brief Report, we propose a method to suppress traffic-driven epidemic outbreak by properly removing some edges in a network. We find that the epidemic threshold can be enhanced by the targeted cutting of links among large-degree nodes or edges with the largest algorithmic betweenness. In contrast, the epidemic threshold will be reduced by the random edge removal. These findings are robust with respect to traffic-flow conditions, network structures, and routing strategies. Moreover, we find that the shutdown of targeted edges can effectively release traffic load passing through large-degree nodes, rendering a relatively low probability of infection to these nodes. © 2013 American Physical Society.

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.

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.

Zheng S.-B.,Fuzhou University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011

We study the coherent cooperative phenomena of the system composed of two interacting atomic ensembles in the thermodynamic limit. Remarkably, the system exhibits the Dicke-like quantum phase transition and entanglement behavior although the governing Hamiltonian is fundamentally different from the spin-boson Dicke Hamiltonian, offering the opportunity for investigating collective matter-light dynamics with pure matter waves. The model can be realized with two Bose-Einstein condensates or atomic ensembles trapped in two optical cavities coupled to each other. The interaction between the two separate samples is induced by virtual photon exchange. © 2011 American Physical Society.

Kang Y.,CAS Fujian Institute of Research on the Structure of Matter | Chen S.,CAS Fujian Institute of Research on the Structure of Matter | Chen S.,Fuzhou University | Wang F.,CAS Fujian Institute of Research on the Structure of Matter | And 2 more authors.
Chemical Communications | Year: 2011

Special asymmetric crystallization of porous framework materials from achiral precursors under urothermal conditions is successfully achieved by using an enantiopure liquid as a co-solvent and chirality induction agent, which provides a new strategy for the synthesis of homochiral porous materials containing only achiral building blocks. © 2011 The Royal Society of Chemistry.

Guo L.,Fuzhou University | Shen H.,Beijing Jiaotong University | Shen H.,University of Adelaide
Theoretical Computer Science | Year: 2012

The min-min problem of finding a disjoint path pair with the length of the shorter path minimized is known to be NP-complete (Xu et al., 2006) [1]. In this paper, we prove that in planar digraphs the edge-disjoint min-min problem remains NP-complete and admits no K-approximation for any K>1 unless P=NP. As a by-product, we show that this problem remains NP-complete even when all edge costs are equal (i.e., stronglyNP-complete). To our knowledge, this is the first NP-completeness proof for the edge-disjoint min-min problem in planar digraphs. © 2012 Elsevier B.V. All rights reserved.

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.

Chen R.,Fuzhou University | Xiang K.-N.,Nankai University
Journal of Combinatorial Theory. Series B | Year: 2012

In this paper, we prove that via an operation "reducing", every 3-connected representable matroid M with at least nine elements can be decomposed into a set of sequentially 4-connected matroids and three special matroids which we call freely-placed-line matroids, spike-like matroids and swirl-like matroids; more concretely, there is a labeled tree that gives a precise description of the way that M built from its pieces. © 2011.

Huang B.,Chinese University of Hong Kong | Wu B.,Fuzhou University | Barry M.,University of Calgary
International Journal of Geographical Information Science | Year: 2010

By incorporating temporal effects into the geographically weighted regression (GWR) model, an extended GWR model, geographically and temporally weighted regression (GTWR), has been developed to deal with both spatial and temporal nonstationarity simultaneously in real estate market data. Unlike the standard GWR model, GTWR integrates both temporal and spatial information in the weighting matrices to capture spatial and temporal heterogeneity. The GTWR design embodies a local weighting scheme wherein GWR and temporally weighted regression (TWR) become special cases of GTWR. In order to test its improved performance, GTWR was compared with global ordinary least squares, TWR, and GWR in terms of goodness-of-fit and other statistical measures using a case study of residential housing sales in the city of Calgary, Canada, from 2002 to 2004. The results showed that there were substantial benefits in modeling both spatial and temporal nonstationarity simultaneously. In the test sample, the TWR, GWR, and GTWR models, respectively, reduced absolute errors by 3.5%, 31.5%, and 46.4% relative to a global ordinary least squares model. More impressively, the GTWR model demonstrated a better goodness-of-fit (0.9282) than the TWR model (0.7794) and the GWR model (0.8897). McNamara's test supported the hypothesis that the improvements made by GTWR over the TWR and GWR models are statistically significant for the sample data. © 2010 Taylor & Francis.

Wang Y.-M.,Fuzhou University | Chin K.-S.,City University of Hong Kong
International Journal of Approximate Reasoning | Year: 2011

Fuzzy analytic hierarchy process (AHP) proves to be a very useful methodology for multiple criteria decision-making in fuzzy environments, which has found substantial applications in recent years. The vast majority of the applications use a crisp point estimate method such as the extent analysis or the fuzzy preference programming (FPP) based nonlinear method for fuzzy AHP priority derivation. The extent analysis has been revealed to be invalid and the weights derived by this method do not represent the relative importance of decision criteria or alternatives. The FPP-based nonlinear priority method also turns out to be subject to significant drawbacks, one of which is that it may produce multiple, even conflict priority vectors for a fuzzy pairwise comparison matrix, leading to entirely different conclusions. To address these drawbacks and provide a valid yet practical priority method for fuzzy AHP, this paper proposes a logarithmic fuzzy preference programming (LFPP) based methodology for fuzzy AHP priority derivation, which formulates the priorities of a fuzzy pairwise comparison matrix as a logarithmic nonlinear programming and derives crisp priorities from fuzzy pairwise comparison matrices. Numerical examples are tested to show the advantages of the proposed methodology and its potential applications in fuzzy AHP decision-making. © 2010 Elsevier Inc. All rights reserved.

Huang Y.-Z.,CAS Fujian Institute of Research on the Structure of Matter | Wu L.-M.,CAS Fujian Institute of Research on the Structure of Matter | Wu X.-T.,CAS Fujian Institute of Research on the Structure of Matter | Li L.-H.,CAS Fujian Institute of Research on the Structure of Matter | And 2 more authors.
Journal of the American Chemical Society | Year: 2010

The combination of lone-pair effects on Pb2+ cations and the smaller electronegativity of I- anions into the pentaborate framework generates a phase-matchable material, Pb2B5O 9I, with the largest powder SHG response among borates, about 13.5 times that of KDP (KH2PO4), and transparency over the near-UV to middle-IR region. DFT calculations on electronic structure and cutoff-energy-dependent SHG coefficients confirm these origins. © 2010 American Chemical Society.

Tan Y.-J.,Fuzhou University
Fuzzy Sets and Systems | Year: 2011

In this paper, generalized fuzzy matrices are considered as matrices over a special type of semiring which is called path algebra. Some properties and characterizations for generalized fuzzy matrices with periods are established and an expression for the transitive closure of a generalized fuzzy matrix with a period as a sum of its powers is shown. Reduction of generalized fuzzy matrices is defined and some properties for reduction of generalized fuzzy matrices with periods are obtained. Also, the structure of all standard eigenvectors for a generalized fuzzy matrix with a period is determined. © 2011 Elsevier B.V. All rights reserved.

Li D.-F.,Fuzhou University
Fuzzy Optimization and Decision Making | Year: 2011

The Atanassov's intuitionistic fuzzy (IF) set theory has become a popular topic of investigation in the fuzzy set community. However, there is less investigation on the representation of level sets and extension principles for interval-valued intuitionistic fuzzy (IVIF) sets as well as algebraic operations. In this paper, firstly the representation theorem of IVIF sets is proposed by using the concept of level sets. Then, the extension principles of IVIF sets are developed based on the representation theorem. Finally, the addition, subtraction, multiplication and division operations over IVIF sets are defined based on the extension principle. The representation theorem and extension principles as well as algebraic operations form an important part of Atanassov's IF set theory. © 2010 Springer Science+Business Media, LLC.

Liu Y.,CAS Fujian Institute of Research on the Structure of Matter | Chen M.,Fuzhou University | Song L.,CAS Fujian Institute of Research on the Structure of Matter
Journal of Luminescence | Year: 2013

The interactions between erlotinib (ET) and bovine serum albumin (BSA) in the absence and presence of Cu(II) and Fe(III) in aqueous solution were investigated by using fluorescence, circular dichroism and three-dimensional (3D) fluorescence spectroscopic methods under simulative physiological conditions. Erlotinib effectively quenched the intrinsic fluorescence of BSA with slight redshifts in the absence and presence of Cu(II) and Fe(III). Cu(II) decreased the binding affinity and reduced the binding sites of erlotinib to BSA, while Fe(III) increased the binding affinity and binding sites of erlotinib to BSA. The negative values of ΔH and ΔS illustrate that the binding is mainly driven by the hydrogen bond and van der Waals force. The conformation of BSA was changed through ET binding in the presence of Cu(II) and Fe(III), which was revealed by circular dichroism, synchronous fluorescence and 3D fluorescence spectroscopic methods. The results indicate that the binding capability of erlotinib to BSA is affected by the types of metal ions. © 2012 Elsevier B.V. All rights reserved.

Tang Z.-R.,Fuzhou University
Physica B: Condensed Matter | Year: 2010

The adsorption of methanol on the perfect and defective single-walled carbon nanotubes (SWCNTs) has been investigated using effective cluster models in conjunction with density functional theory. It has been found that methanol is adsorbed very weakly on the sidewall of perfect SWCNT, which is in agreement with experiment observation. In contrast, it is quite interesting to find that methanol is not only strongly chemisorbed at the zigzag edge site of defective SWCNT, but also the O-H bond of methanol is completely dissociated. This suggests that the zigzag edge of SWCNT can be the active site for adsorption and activation of methanol. However, the adsorption of methanol at the armchair edge of SWCNT is rather weak, hence suggesting the crucial effect of local edge carbon atoms arrangement on the adsorption behavior of methanol on carbon nanotubes. © 2009 Elsevier B.V. All rights reserved.

Wang Y.-M.,Fuzhou University | Chin K.-S.,City University of Hong Kong
Computers and Mathematics with Applications | Year: 2011

Fuzzy quality function deployment (QFD) has been extensively used for translating customer requirements (CRs) into product design requirements (DRs) in fuzzy environments. Existing approaches, however, for rating technical importance of DRs in fuzzy environments are found problematic, either incorrect or inappropriate. This paper investigates how the technical importance of DRs can be correctly rated in fuzzy environments. A pair of nonlinear programming models and two equivalent pairs of linear programming models are developed, respectively, to rate the technical importance of DRs. The developed models are examined and illustrated with two numerical examples. © 2011 Elsevier Ltd. All rights reserved.