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why needs to organise itself Wuhan University of Technology - located in Wuhan, Hubei, China - was merged on May 27, 2000, from the former three universities, Wuhan University of Technology , Wuhan Transportation University and Wuhan Automotive Polytechnic University . WUT is one of the leading Chinese universities accredited by the Ministry of Education and one of the universities constructed in priority by the "State Project 211" for Chinese higher education institutions. Wikipedia.

Guo B.,Wuhan University of Technology | Guo B.,University of Alberta
Journal of Electromagnetic Waves and Applications | Year: 2012

A plasma metamaterial that exhibits negative refraction in the terahertz region of the spectrum has been demonstrated in the present communication. The plasma metamaterial is an uniaxial anisotropic metamaterial which is a multilayer stack of alternating plasma layer and background material. The negative refraction in the terahertz region of the proposed metamaterial is explored. The effects of the losses in plasma, plasma density, plasma filling factor, and dielectric constant of background material on the critical frequency ω0 and the band width of negative refraction Δω are examined and discussed. © 2012 Taylor & Francis.

Li D.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

PM2.5 is a scientific index used for measuring air pollution degree. WHO proposesPM2.5 less than 10 is safe. However, PM2.5 in many areas of China is higher than 50 and evenclose to 80, which is much higher than that in Sahara Desert. From the perspective of environmentalprotection and human's physical health, it is necessary for governmental departments to organizeenvironmental monitoring stations for carrying out PM2.5 concentrations monitoring, using theannual concentration of 35 micrograms/m3 as standard and knowing well the dynamics of PM2.5concentration with all sorts of flexible monitoring methods. Therefore, concerning about these, astudy is made in this paper. © (2013) Trans Tech Publications, Switzerland.

Wong T.-S.,Pennsylvania State University | Sun T.,Wuhan University of Technology | Feng L.,Tsinghua University | Aizenberg J.,Harvard University
MRS Bulletin | Year: 2013

Various life forms in nature display a high level of adaptability to their environments through the use of sophisticated material interfaces. This is exemplified by numerous biological systems, such as the self-cleaning of lotus leaves, the water-walking abilities of water striders and spiders, the ultra-slipperiness of pitcher plants, the directional liquid adhesion of butterfly wings, and the water collection capabilities of beetles, spider webs, and cacti. The versatile interactions of these natural surfaces with fluids, or special wettability, are enabled by their unique micro/nanoscale surface structures and intrinsic material properties. Many of these biological designs and principles have inspired new classes of functional interfacial materials, which have remarkable potential to solve some of the engineering challenges for industrial and biomedical applications. In this article, we provide a snapshot of the state of the art of biologically inspired materials with special wettability, and discuss some promising future directions for the field. Copyright © 2013 Materials Research Society.

Dai K.,Huaibei Normal University | Lu L.,Wuhan University of Technology | Liu Q.,CAS Institute of Microelectronics | Zhu G.,Huaibei Normal University | And 2 more authors.
Dalton Transactions | Year: 2014

Surface-fluorinated TiO2 (F-TiO2) nanosheets with exposed (001) facets were synthesized from a scalable hydrothermal treatment assisted by a specific stabilization effect of fluorine ions on the (001) facets. Assembly of F-TiO2 on graphene oxide (GO) sheets into GO/F-TiO2 hybrid in aqueous solution was further achieved by making use of the surfactant role of GO. Photocatalytic properties of GO/F-TiO 2 hybrid were evaluated under 365 nm UV light irradiation for photodegradation of methylene blue (MB). An optimal GO content has been determined to be 3 wt%, and the corresponding apparent pseudo-first-order rate constant Kapp is 0.0493 min-1, 3 times and 4 times more than that of pure TiO2 nanosheets and commercial P25 photocatalyst, respectively. To reveal the synergism reinforce mechanism of GO/F-TiO 2 hybrid, photo absorption, surface absorption, and the photoelectrochemical current properties have been intensively studied. We found that enhanced electron-hole separation has been the key issue for the reinforcement of photocatalytic performance. F-TiO2 with exposed (001) facet has stronger electron-hole separation resulting in a higher photoelectrochemical current than that of P25 photocatalyst. Moreover, hybridization of F-TiO2 with GO could further increase the photoelectrochemical current and the largest current for the optimal weight fraction of GO is in good accordance with the photocatalysis performance. The GO/F-TiO2 interface junction that favors the electron-hole separation was attributed to the photoelectrochemical current enhancement. © 2014 The Royal Society of Chemistry.

Luo L.,Wuhan University of Technology
Journal of Computational and Theoretical Nanoscience | Year: 2013

An array with binary entries has the Golomb property if the discrete autocorrelation function has just three values: 0, 1, and J. Let k, N 1, N2, ⋯ , Nk be positive integers, the maximum number of ones among all k-dimensional arrays (Nk,N k-1, ⋯ , N1) is denoted by G(Nk,N 2, ⋯ , N1). Based on transformation multiple dimensional Golomb arrays into one dimensional Golomb rulers and empirical computational techniques, a large mount of exact values and lower bounds of G(Nk,N2, ⋯ , N1) are found. Copyright © 2013 American Scientific Publishers.

Liu L.,Wuhan University of Technology
Procedia Engineering | Year: 2011

To consolidate the enterprise's market position, it needs a powerful material supply chain to support the enterprise's development. However, the material supply cannot keep pace with the rapid speed of the construction of the most enterprises. To overcome this problem, this paper has presented a new management system of material supplies based on the modern Logistics supply chain theory for the enterprise material supply management. By the use of modern Logistics supply chain theory, the enterprise material supply can be formed as a powerful circle. This chain structure can help the Logistics cost reduction, and improve the enterprise's core competitiveness. The function design of the chain system components has been discussed. The analysis results show that the proposed management system could impel the development of the supply intensification strategy and provide theory and technology support to the advanced material supply management for enterprises. Thus, the proposed method has application importance. © 2011 Published by Elsevier Ltd.

Zhao J.,Qingdao University of Science and Technology | Zhang D.,Wuhan University of Technology | Zhang X.,Qingdao University of Science and Technology
Surface and Interface Analysis | Year: 2015

Core-shell copper/silver bimetallic nanowires were prepared by replacement reaction with citric acid and polyvinylpyrollidone at room temperature. A uniform silver coating was obtained by strictly controlling the molar ratio of Ag/Cu. The copper/silver composite was characterized by X-ray diffraction, scanning electron microscopy, electron probe microanalysis and X-ray photoelectron spectroscopy. Microscopic analysis shows that a well-copper/silver core-shell structure was formed. Thermo-gravimetry and differential thermal analysis to the composite nanowires show that the silver coatings efficiently inhibit the oxidation of Cu. Copyright © 2015 John Wiley & Sons, Ltd.

Li Z.,China University of Mining and Technology | Sheng C.,Wuhan University of Technology
Journal of Nanoscience and Nanotechnology | Year: 2014

This review summarizes recent research and development of nanosensors applied to the food safety. Since the food safety is directly related to the people's health and life, the food detection has received considerable attentions. However, this food security has emerged in China as a severe problem in recent years. Food safety problems frequently compromised due to formaldehyde, poison vegetables, excessive pesticide residues, etc. These kinds of food contaminations could not be detected efficiently by traditional methods. Applying nanotechnology and nanominerals, various food contaminations can be identified accurately. Therefore nanosensors have been widely used in the food detection. We introduce current research on nanosensors followed by the industrial application of nanosensors. Finally, the challenges for the future food safety using nanosensors are discussed. Copyright © 2014 American Scientific Publishers All rights reserved.

Lei D.,Wuhan University of Technology
Computers and Industrial Engineering | Year: 2010

This paper presents the fuzzy job shop scheduling problem with availability constraints. The objective is to find a schedule that maximizes the minimum agreement index subject to periodic maintenance, non-resumable jobs and fuzzy due-date. A random key genetic algorithm (RKGA) is proposed for the problem, in which a novel random key representation, a new decoding strategy incorporating maintenance operation and discrete crossover (DX) are used. RKGA is applied to some fuzzy scheduling problem with availability constraints and compared with other algorithms. Computational results show that RKGA performs better than other algorithms. © 2010 Elsevier Ltd. All rights reserved.

Lei D.,Wuhan University of Technology
Computers and Industrial Engineering | Year: 2015

Multi-agent scheduling in flow shop environment is seldom considered. In this paper flow shop scheduling problem with two agents is studied and its feasibility model is considered, in which the goal is to minimize the makespan of the first agent and the total tardiness of the second agent simultaneously under the given upper bounds. A simple variable neighborhood search (VNS) algorithm is proposed, in which a learning neighborhood structure is constructed to produce new solutions and a new principle is applied to decide if the current solution can be replaced with the new one. VNS is tested on a number of instances and the computational results show the promising advantage of VNS when compared to other algorithms of the problem. © 2014 Elsevier Ltd. All rights reserved.

Luo Z.,Clemson University | Xiao F.,Wuhan University of Technology | Hu S.,Nanjing Hydraulic Research Institute | Yang Y.,CAS Wuhan Institute of Rock and Soil Mechanics
Construction and Building Materials | Year: 2013

In this paper, the fatigue life of rubberized asphalt concrete mixtures containing reclaimed asphalt pavement is investigated through probabilistic analysis. The simple traditional empirical models updated with a reliable database are employed to predict the fatigue lives of various mixtures containing crumb rubber and/or reclaimed asphalt pavement. The effects of model uncertainty and input parameter uncertainty on the fatigue life are interpreted with the probability of fatigue failure, this is defined herein as the probability that the predicted fatigue life fails to satisfy the minimum requirements of fatigue life. The probabilistic analysis of fatigue failure is estimated with a simple reliability-based approach, known as point estimate approach (PEM). Comparison study shows that the probability of fatigue failure obtained with PEM is identical with that obtained with the Monte Carlo simulation (MCS). The results indicated that the probabilistic analysis using PEM and MCS methodologies can be used for exploring the fatigue life probability effectively, requires very limited computational effort, and thus has the potential and ease as a practical tool to employ in pavement engineering. © 2012 Elsevier Ltd. All rights reserved.

Xiao F.,Clemson University | Punith V.S.,Clemson University | Amirkhanian S.N.,Wuhan University of Technology
Fuel | Year: 2012

Due to many reasons including the energy reductions and environmental benefits, warm asphalt has been gaining increasing popularity in recent years around the world. In the present study, the objective was to conduct a laboratory investigation of rheological properties of non-foaming WMA additives at high performance temperatures. The conventional testing procedures such as viscosity, performance grade, creep and creep recovery, amplitude sweep and frequency sweep as well as specific Fourier Transform Infrared Spectroscopy (FTIR) were performed to determine the influences of non-foaming additives on asphalt binders. The experimental design included eight binders and four non-foaming WMA additives. The test results indicated that, the non-foaming WMA additive can slightly reduce the viscosity value of asphalt binder and thus decrease the mixing and compaction temperatures of the mixture. The binders containing non-foam additive have a slight increase in high failure temperatures compared to control binder and thus improving the rutting resistance of the mixtures. In addition, creep recovery, amplitude and frequency sweep tests show that the binders with Sasobit has a slightly higher complex modulus but exhibits lower creep compliance and phase angle than the binder containing other WMA additives regardless of asphalt type and grade. Furthermore, FTIR analysis results indicate that the binder type plays a key role in determining the rheological properties of WMA binders. © 2011 Elsevier Ltd. All rights reserved.

Tian G.-L.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2015

The emission characteristics of dust particles and gaseous pollutions from new dry process cement production (Henan, China). The results indicated that the concentration of PM10 doesn't meet the national standard, which was from the four process including the kiln head, kiln tail, coal mill, cement grinding mill after dust elimination. The PM2.5 has an important influence on the PM10. The concentration of SO2 meets the national standard, but the concentration of NO2 is above the national standard. Moreover, the CO2 emissions are 1013.925 kg CO2 per tone clinker according to the calculation. ©, 2015, Wuhan University of Technology. All right reserved.

Zhou X.,CAS National Center for Nanoscience and Technology | Liu G.,CAS National Center for Nanoscience and Technology | Yu J.,Wuhan University of Technology | Fan W.,Beihang University
Journal of Materials Chemistry | Year: 2012

Harvesting abundant and renewable sunlight in energy production and environmental remediation is an emerging research topic. Indeed, research on solar-driven heterogeneous photocatalysis based on surface plasmon resonance has seen rapid growth and potentially opens a technologically promising avenue that can benefit the sustainable development of global energy and the environment. This review briefly summarizes recent advances in the synthesis and photocatalytic properties of plasmonic composites (e.g., hybrid structures) formed by noble metal (e.g., gold, silver) nanoparticles dispersed on a variety of substrates that are composed of metal oxides, silver halides, graphene oxide, among others. Brief introduction of surface plasmon resonance and the synthesis of noble metal-based composites are given, followed by highlighting diverse applications of plasmonic photocatalysts in mineralization of organic pollutants, organic synthesis and water splitting. Insights into surface plasmon resonance-mediated photocatalysis not only impact the basic science of heterogeneous photocatalysis, but generate new concepts guiding practical technologies such as wastewater treatment, air purification, selective oxidation reactions, selective reduction reactions, and solar-to-hydrogen energy conversion in an energy efficient and environmentally benign approach. This review ends with a summary and perspectives. © 2012 The Royal Society of Chemistry.

Huang C.,Lund University | Tu Z.,Wuhan University of Technology | Shen X.,Lund University
Journal of Hazardous Materials | Year: 2013

To realize selective mineralization of low-level chlorophenols (CPs) in the presence of high-level ordinary pollutants, molecularly imprinted polymers (MIPs) coated photocatalyst was prepared using substrate analog as template. The pseudo-template imprinted photocatalysts showed rapid decomposition ability toward a group of CPs. Based on the complete dechlorination and spectrophotometry, a new method was proposed to detect the total organochlorine on CPs in water samples. The method showed good linearity when the concentrations of the total organochlorine on CPs is in the range of 12.0-200.0μmolL-1. The detection limit is 1μmolL-1 for this method. When this method was applied to measure the total organochlorine of the CPs in both tap water and river water samples, an average recovery ranged from 96.3% to 105.1% was obtained with RSD values less than 5%. In this green and simple method, the common inorganic ions in water showed no interference for the detection. The determination of the total organochlorine on the CPs might be used for estimation of the toxicity and the persistence of the water samples. © 2013.

Lei D.,Wuhan University of Technology
International Journal of Advanced Manufacturing Technology | Year: 2010

This paper addresses job shop scheduling problems with fuzzy processing time and fuzzy trapezoid or doublet due date. An efficient random key genetic algorithm (RKGA) is suggested to maximize the minimum agreement index and to minimize the maximum fuzzy completion time. In RKGA, a random key representation and a new decoding strategy are proposed and two-point crossover (TPX) and discrete crossover (DX) are considered. RKGA is applied to some fuzzy scheduling instances and performance analyses on random key representation, and the comparison between RKGA and other algorithms are done. Computation results validate the effectiveness of random key representation and the promising advantage of RKGA on fuzzy scheduling. © 2009 Springer-Verlag London Limited.

Pan F.,Hubei University | Wu X.,Wuhan University of Technology
Procedia Engineering | Year: 2011

The purpose of this thesis is to discuss the sustainable development of high-rise building in Chinese cities. As the construction climax of high-rise building has arrived in China, many constructed or constructing high-rise buildings are still in the state of environment-unfriendly, low standard and efficiency, high consumption and pollution, and featureless. This kind of development is not sustainable. The method used in this study is analysis of environment protection, safety, and efficiency of the high-rise building, which tend to solve these above problems and make a sustainable development. The paper suggests that it is necessary to establish the green high-rise building system, which to be composed of external environment, internal floorplan and Architectural Form. © 2011 Published by Elsevier Ltd.

Zhang H.,Hunan University | Shi C.,Hunan University | Han J.,Jiangsu Baoli Asphalt Co. | Yu J.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

The effect of organic layered silicates (OLSs) on the flame retardancy and aging properties of the bitumen was investigated as well as the microstructures of the binders. X-ray diffraction shows that organic rectorite (OREC) and organic montmorillonite (OMMT) modified bitumens form the intercalated nanostructures, while the organic expanded vermiculite (OEVMT) modified bitumen forms the exfoliated nanostructure. The mass change rate and viscosity aging index of the bitumen are decreased by OLSs after thin film oven test and pressure aging vessel aging. Compared with OREC and OMMT, OEVMT has more pronounced improvements in flame retardancy and aging resistance of bitumen. © 2012 Elsevier Ltd. All rights reserved.

Cao S.,Wuhan University of Technology | Yu J.,King Abdulaziz University
Journal of Photochemistry and Photobiology C: Photochemistry Reviews | Year: 2016

Photocatalytic hydrogen production from water splitting is of promising potential to resolve the energy shortage and environmental concerns. During the past decade, carbon materials have shown great ability to enhance the photocatalytic hydrogen-production performance of semiconductor photocatalysts. This review provides a comprehensive overview of carbon materials such as CNTs, graphene, C60, carbon quantum dots, carbon fibers, activated carbon, carbon black, etc. in enhancing the performance of semiconductor photocatalysts for H2 production from photocatalytic water splitting. The roles of carbon materials including supporting material, increasing adsorption and active sites, electron acceptor and transport channel, cocatalyst, photosensitization, photocatalyst, band gap narrowing effect are explicated in detail. Also, strategies for improving the photocatalytic hydrogen-production efficiency of carbon-based photocatalytic materials are discussed in terms of surface chemical functionalization of the carbon materials, doping effect of the carbon materials and interface engineering between semiconductors and carbon materials. Finally, the concluding remarks and the current challenges are highlighted with some perspectives for the future development of carbon-based photocatalytic materials. © 2016 Elsevier Ireland Ltd.

Mao S.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

Financing and making profit are worldwide problems needed to be solved during the development of urban rail transit. Based on the combination of theoretical analysis and practical metro construction project, this paper develops a mode of MC (Metro and Community), which includes planning analysis, financing mode, and land resources planning and exploiting. The effectiveness and feasibility of MC have also been verified with specific development of urban rail transit. Its results show that the financing difficulty can be effectively solved with MC mode, and great profit can be made for urban rail transit companies. ©, 2015, Wuhan University of Technology. All right reserved.

Chen Z.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

The world's top 1% of ESI discipline is an important symbol of the overall advantage of discipline construction of the universities. In this paper, a metrological analysis of discipline competitiveness of Engineering of Wuhan University of Technology (WHUT) will be made from four indicators: discipline productivity, influence, innovation and development. Discipline productivity is evaluated by the analysis of number of ESI papers, institutions and authors; Discipline influence is measured by the analysis of citations, highly cited papers, academic ranking and publications; Discipline innovation and development is analyzed by ESI hot papers and the rate of highly cited papers respectively. It show that the discipline productivity of Engineering of WHUT has been greatly improved and discipline influence has been expanded, while discipline innovation and development still need to be improved. Based on the service experiences of information resources of the library, constructive suggestion will be made for the improvement of discipline competitiveness of Engineering of WHUT. ©, 2015, Wuhan University of Technology. All right reserved.

Guo Z.-H.,Shandong University | Li D.,Wuhan University of Technology | Zhang B.-Y.,Beijing Institute of Radio Measurement and Metrology
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2013

Radar target recognition is increasingly important with the development of radar techniques and the urgent military requirements. The research on radar target recognition using one-dimensional high range resolution profiles is a popular area in the radar and signal processing community. The range profiles can not only provide the information on shape and structure of the target but also be obtained easily. So far extensive research work has already been made in the field of non-cooperative target recognition using the range profiles. The feature extraction algorithm, classification algorithm and joint tracking and recognition algorithm based on the radar range profiles are summarized. Finally, the still open problems are discussed and some suggestions on the solutions and research trends are proposed.

Lv X.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2015

Aiming at the single failure problem and the hot spot problem on data collection algorithms, a balanced energy consumption and uneven clustering data collection algorithm is proposed. The proposed algorithm divides the network into uneven grids, and a cluster is made up of nodes in the same grid. The number of cluster heads is decided by the node failure probability, and the cluster heads in the same cluster cooperatively transmit the collection data to the base station. Experimental results demonstrate that the proposed algorithm can't only improve the reliability of data collection and energy consumption balance, but also prolong the life of network. ©, 2015, Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology. All right reserved.

Chen J.-F.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013

Four typical coals in southwestern Guizhou were selected as the research object. The test apparatus for arsenic and sulfur emission during coal combustion were established. Moreover, the main factors of arsenic and sulfur emission rate were researched. The kinetics parameters of arsenic and sulfur emission were obtained preliminly during the coal combustion. The results showed that arsenic and sulfur emission rate of four kinds of coal increased with increasing combustion temperature. The arsenic activation energy is higher than that of the sulfur in coal, indicating that the arsenic forming temperature is higher than that of the sulfur in coal. The experimental results arc also consistent with the dynamics data.

Lei D.,Wuhan University of Technology | Guo X.,Southwest Jiaotong University
International Journal of Production Research | Year: 2013

We consider lot streaming problem in a job shop with consistent sub-lots and transportation, in which each lot is regarded as an individual job to reduce management complexity. A modified artificial bee colony (MABC) algorithm is proposed to minimise makespan. An effective two-phase decoding procedure is applied, in which a schedule is first built and then transportation tasks are dispatched. A swap and an insertion are used in the employed bee phase and the onlooker bee phase respectively to produce new solutions. No scouts are considered and the worst solution is replaced with the elite solution every certain cycles to enhance the diversity of the swarm. The testing results and the comparisons of MABC with some methods show that MABC performs better than the chosen algorithms on the considered problem. © 2013 Taylor and Francis Group, LLC.

Ma X.,KTH Royal Institute of Technology | Jin J.,KTH Royal Institute of Technology | Lei W.,Wuhan University of Technology
Transportation Research Part D: Transport and Environment | Year: 2014

Increasing concerns on environment and natural resources, coupled with increasing demand for transport, put lots of pressure for improved efficiency and performance on transport systems worldwide. New technology nowadays enables fast innovation in transport, but it is the policy for deployment and operation with a systems perspective that often determines success. Smart traffic management has played important roles for continuous development of traffic systems especially in urban areas. There is, however, still lack of effort in current traffic management and planning practice prioritizing policy goals in environment and energy. This paper presents an application of a model-based framework to quantify environmental impacts and fuel efficiency of road traffic, and to evaluate optimal signal plans with respect not only to traffic mobility performance but also other important measures for sustainability. Microscopic traffic simulator is integrated with micro-scale emission model for estimation of emissions and fuel consumption at high resolution. A stochastic optimization engine is implemented to facilitate optimal signal planning for different policy goals, including delay, stop-and-goes, fuel economy etc. In order to enhance the validity of the modeling framework, both traffic and emission models are fine-tuned using data collected in a Chinese city. In addition, two microscopic traffic models are applied, and lead to consistent results for signal optimization. Two control schemes, fixed time and vehicle actuated, are optimized while multiple performance indexes are analyzed and compared for corresponding objectives. Solutions, representing compromise between different policies, are also obtained in the case study by optimizing an integrated performance index. © 2014 Elsevier Ltd.

Jiang N.,Wuhan University of Technology
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2013

This paper realizes the four-channel optical fiber combustible gas monitoring system by using the tunable diode laser absorption spectroscopy (TDLAS) and light splitting technology. The monitoring of the system is the separation type. The passive sensing probe and active instrument are connected by the optical fiber. The light signal containing concentration information transfers to the instruments to be processed through the optical fiber. The sensing probe which is only composed of the gas chamber and optical component without any circuit can guarantee the intrinsic safety and the anti-interference ability of the probe. The system can realize the warning forecast of the remote, long-term online distributed gas concentration. The paper also designs a phase-lock multiplication demodulating circuit, which can analyze the weak signal and solve the phase delay caused by the fiber transmission and find a solution to the deviation of the results. The monitor system emplaces 71 optical fiber methane sensing probes in a large oil depot reservoir area. The long-term experiment results show that the measurement results of the system are not influenced by the length of the optical fiber, and the system can get a correct detection of gas concentration value in the 0-5% (0-100 LEL) measuring range.

Zhu G.-R.,Wuhan University of Technology | Tan S.-C.,University of Hong Kong | Chen Y.,Huazhong University of Science and Technology | Tse C.K.,Hong Kong Polytechnic University
IEEE Transactions on Power Electronics | Year: 2013

Fuel-cell power systems comprising single-phase dc/ac inverters draw low-frequency ac ripple currents at twice the output frequency from the fuel cell. Such a 100/120Hz ripple current may create instability in the fuel-cell system, lower its efficiency, and shorten the lifetime of a fuel cell stack. This paper presents a waveform control method that can mitigate such a low-frequency ripple current being drawn from the fuel cell while the fuel-cell system delivers ac power to the load through a differential inverter. This is possible because with the proposed solution, the pulsation component (cause of ac ripple current) of the output ac power will be supplied mainly by the two output capacitors of the differential inverter while the average dc output power is supplied by the fuel cell. Theoretical analysis, simulation, and experimental results are provided to explain the operation and showcase the performance of the approach. Results validate that the proposed solution can achieve significant mitigation of the current ripple as well as high-quality output voltage without extra hardware. Application of the solution is targeted at systems where current ripple mitigation is required, such as for the purpose of eliminating electrolytic capacitor in photovoltaic and LED systems. © 1986-2012 IEEE.

Yuan X.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

Study of hydrogen releasing efficiency is an important part of hydrogen cell development. A serials of nonlinear partial differential equations are simplified to model the mass balance, momentum balance and energy balance principles engaged in hydrogen releasing action process. 2D-symetric and 1D models are built to describe variable nonlinear coupling during the reaction based on Darcy's Law, Mass Convection and Diffusion and Heat Transfer in Porous Media modules in COMSOL Multi-physics 5.0. Comparison of convergence and solving efficiency between 2D-symetric and 1D models are made. The models analyze the solid hydrogen density, gas hydrogen density, Darcy pressure, Darcy velocity and temperature as function of time and their dimensional distribution. Results shows that such variable's dimensional fluctuation is far less than their time dependent fluctuation, which indicates that a 1D model is a much efficient and convergent method to analyze the releasing efficiency and safety hydrogen storage technique based on hydride metal. ©, 2015, Wuhan University of Technology. All right reserved.

Hao X.,Inner Mongolia University of Science and Technology | Zhou J.,Wuhan University of Technology | An S.,Inner Mongolia University of Science and Technology
Journal of the American Ceramic Society | Year: 2011

A 400-nm-thick (Pb0.97La0.02)(Zr 0.97Ti0.03)O3 (PLZT 2/97/3) antiferroelectric (AFE) thin films with different lead excess content (0%, 10%, and 20%) were successfully deposited on Pt(111)/TiO2/SiO2/Si substrates via a sol-gel process. The effects of lead excess content on the microstructure, dielectric properties, and energy storage performance of PLZT 2/97/3 AFE thin films were investigated in details. X-ray diffraction results displayed that AFE thin films were changed from the (111)-preferred orientation to the (100) and (111)-mixed orientation with increasing lead excess content. Dielectric measurements showed that AFE thin films with higher lead excess content exhibited enhanced dielectric constant and larger phase transformation fields. Thus, the energy storage density of AFE thin films was also remarkably improved from 3.3 to 11.7 J/cm3 at 1200 kV/cm. © 2011 The American Ceramic Society.

Li N.,Technical University of Delft | Molenaar A.A.A.,Technical University of Delft | Van De Ven M.F.C.,Technical University of Delft | Wu S.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

Laboratory fatigue testing is widely used to evaluate fatigue characteristics of asphalt mixtures in the pavement design. The fatigue results based on the classical fatigue analysis is influenced by the test types and specimen size. The goal of the research in this paper is to develop a new fatigue analysis method, which enables comparison of the fatigue relations obtained from different types of fatigue test and using different specimen sizes. The yield surface at the critical location of the specimen was determined in the I1 - √J2 space based on monotonic tension and compression test results. Then a new parameter RΔ was introduced as an indicator of the "safety against failure" at a certain stress state. A straight line was found by plotting RΔ at the critical location and the fatigue life on log-log scale. The results show that this new fatigue analysis method provides a possibility to compare the fatigue results obtained from different test types and specimen sizes. © 2013 Elsevier Ltd. All rights reserved.

Jiang X.,Wuhan University of Technology | Jiang X.,Technical University of Delft | Guedes Soares C.,University of Lisbon
Marine Structures | Year: 2012

The aim of this paper is to investigate the effects of corrosion pits on the ultimate capacity of mild steel rectangular plates under uniaxial compression. For aging ship structures suffering from corrosion deterioration, the normal inspection practice is to measure the pit intensity (DOP) and maximum or average pit depth. A series of nonlinear FEM analysis on plates with partial and through thickness corrosion pits are carried out, changing geometrical attributes of both pits and plates, i.e., the radius, depth and location of pits and the slenderness of plates. The simulation results show that the volume loss dominates the degradation of the compressive capacity of pitted mild steel plates in addition to plate slenderness. This effect can be represented by the DOP and average thickness loss at pits, and the later primarily governs the collapse behavior of the plate itself. It is found that single side distributed pits have slightly severer deterioration on plates than the double sided pits with the same total thickness reduction, which tends to be more evident with increasing DOP and partial depth at pits Finally, an empirical formula based on FEM results is proposed to predict the ultimate capacity of pitted plates under in-plane compression, which can be used for practical purposes. The comparison between results from the FEM simulation and the formula shows a satisfactory fit. © 2011 Elsevier Ltd.

Xia Y.,Hong Kong Polytechnic University | Chen B.,Hong Kong Polytechnic University | Chen B.,Wuhan University of Technology | Zhou X.-Q.,Shenzhen University | Xu Y.-L.,Hong Kong Polytechnic University
Structural Control and Health Monitoring | Year: 2013

It is important to take into account the effect of temperature in assessing the structural condition of bridges. However, very few quantitative studies have examined the temperature behavior of large-scale bridges because of their large size and complicated configuration. This paper, for the first time, investigates the temperature distribution and associated responses of a long-span suspension bridge - the 2132-m-long Tsing Ma Bridge - through a combination of numerical analysis and field monitoring. With appropriate assumptions, fine finite element models of a deck plate, section frame, and bridge tower are constructed to facilitate thermal analysis. With ambient temperature measurements and a solar radiation model, the time-dependent temperature distribution within each of these components is calculated through transient heat transfer analysis. The numerical results are verified by comparing them with field monitoring data on temperature distribution and variation at different times and in different seasons. The temperature data are then input into the structural model of the whole bridge to obtain the displacement and strain responses of various bridge components, with a good level of agreement being achieved between the bridge responses and the monitoring data. This exercise verifies both the accuracy of the analytical method employed and the effectiveness of the monitoring system installed on the bridge. The study shows that integrating numerical analysis with field monitoring data provides for a thorough understanding of the temperature behavior of long-span bridges. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.

Li H.,Wuhan University of Technology
International Review on Computers and Software | Year: 2012

Data mining is a process that extracts the implicit, unknown and useful knowledge from the large, incomplete, noise, fuzzy and random data. It's a new technology to solve the problem of "rich data while poor knowledge". To overcome the shortcomings of traditional outlier detection algorithm, a new approach of spatial neighborhood outlier detection based on entropy measurement is proposed. In this dissertation, the spatial attributes are used to determine spatial neighborhood, entropy theory is used to determine the weight of non-spatial attributes, and the non-spatial dimensions are used to compute the spatial neighborhood outlier factor, thus spatial neighborhood outliers can be captured. Theoretical analysis shows that the algorithm is reasonable. The experimental results show that the approach is practical and efficient. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.

He Z.,Wuhan University of Technology
International Review on Computers and Software | Year: 2012

The three-dimension (3D) data of virtual urban buildings are complex and diverse, and its quantity is massive. Those bring very big challenge for the management and service of 3D urban model data under network circumstance. Existing spatial data model is not suitable for large-scale 3D model data management and service on network. On the basis of analyzing the characteristic of network service about massive 3D urban model data, this paper focuses on the organization and management of spatial data and the network services strategy, and proposes a progressive network transmission schema based on the spatial resolution and the component elements of 3D building model data. Next, this paper puts forward multistage-link three-dimensional spatial data model and encoding method of spatial index based on fully level quad-tree structure. Then, an experiment system is developed using proposed theory. Experimental results have shown that the proposed 3D spatial data model can availably manage large-scale 3D urban model data and provide the network services real-timely. © 2012 Praise Worthy Prize S.r.l. -All rights reserved. -All rights reserved.

Yang H.,Wuhan University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

This paper investigates the grammaticalization of “po” on the basis of a survey on examples from Chinese classic works, and finds that: 1) the use of “po” shifted from an adjective to a degree adverb and a scope adverb; 2) the use of “po” shifted from an objective scope adverb to a modal adverb. This paper focuses on the syntactic environment that triggered the grammaticalization of “po” and how it became a functional word. The increasing subjectivity of this functional word is also discussed. © Springer International Publishing Switzerland 2014

Wan X.-J.,Hubei University of Automotive Technology | Zhang Y.,Wuhan University of Technology
International Journal of Machine Tools and Manufacture | Year: 2013

In the aerospace industry, the reasonable layout of fixture can efficiently suppresses machining vibration of thin-walled aerospace structure during machining. Based on the analysis of typical structural components encountered in the aerospace industry, a general frame-structure workpiece with fixture constraints can be equivalent as Mindlin plates with simultaneous elastic edges and internal supports. On basis of the equivalent models, the powerful pb-2 Ritz method defined by the product of a two-dimensional polynomial and basic functions can be introduced to be taken as trial functions. Substituting displacement functions into energy functional and minimizing total energy by differentiation leads to eigenfrequency equations of the workpiece-fixture system. Consequently, a novel nonlinear programming problem based on the frequency sensitivity can be built to optimize the layout of fixture supports to maximize the fundamental nature frequency of the workpiece-fixture system. The feasibility of the proposed approach is validated by a machining case. © 2013 Elsevier Ltd.

Guo B.,Wuhan University of Technology
Physics of Plasmas | Year: 2013

Characteristic equations in magnetized plasma with chirality are derived in simple formulations and the dispersion relations for propagation parallel and perpendicular to the external magnetic field are studied in detail. With the help of the dispersion relations of each eigenwave, the author explores chirality-induced negative refraction in magnetized plasma and investigates the effects of parameters (i.e., chirality degree, external magnetic field, etc.) on the negative refraction. The results show that the chirality is the necessary and only one factor which leads to negative refraction without manipulating electrical permittivity and magnetic permeability. Both increasing the degree of chirality and reducing the external magnetic field can result in greater range negative refraction. Parameter dependence of the effects is calculated and discussed. © 2013 AIP Publishing LLC.

Lu J.,Curtin University Australia | Lu J.,Nanyang Technological University | Tang H.,Wuhan University of Technology | Lu S.,Beihang University | And 2 more authors.
Journal of Materials Chemistry | Year: 2011

Direct methanol fuel cells (DMFCs) based on high-temperature (100-300 °C) proton exchange membranes (HT-PEMs) offer significant advantages over the current low-temperature DMFCs based on perfluorosulfonic acid (e.g., Nafion™), such as reduction in CO poisoning via faster reaction kinetics, thus increasing the energy efficiency and reducing precious metal loading. This paper reports a novel inorganic proton exchange membrane based on 12-tungstophosphoric acid mesoporous silica (HPW-meso-silica) nanocomposites. The HPW-meso-silica was synthesized via a one-step self-assembly route assisted by a triblock copolymer, Pluronic P123, as the structure-directing surfactant. The threshold of the HPW content in the nanocomposites for the conductivity of mesoporous silica is 5 wt%. The best results were obtained at 25 wt% HPW-meso-silica, delivering a high proton conductivity of 0.091 S cm -1 at 100 °C under 100% relative humidity (RH) and 0.034 S cm-1 at 200 °C under 3% RH and a low activation energy of 14.0 kJ mol-1. The maximum power density of a cell with a 25 wt% HPW-meso-silica membrane is 19 mW cm-2 at 25 °C and increased to 235 mW cm-2 at 150 °C in methanol fuel. © 2011 The Royal Society of Chemistry.

Xu W.,Wuhan University of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

This paper mainly focuses on the digital demonstration of three gorges archeological relics to exhibit the achievements of the protective measures. A novel and effective method based on 3D-visualization technology, which includes large-scaled landscape reconstruction, virtual studio, and virtual panoramic roaming, etc, is proposed to create a digitized interactive demonstration system. The method contains three stages: pre-processing, 3D modeling and integration. Firstly, abundant archaeological information is classified according to its history and geographical information. Secondly, build up a 3D-model library with the technology of digital images processing and 3D modeling. Thirdly, use virtual reality technology to display the archaeological scenes and cultural relics vividly and realistically. The present work promotes the application of virtual reality to digital projects and enriches the content of digital archaeology. © 2015 SPIE.

Jiang X.,Technical University of Delft | Jiang X.,Wuhan University of Technology | Guedes Soares C.,University of Lisbon
Thin-Walled Structures | Year: 2012

The aim of the present paper is to investigate the effects of pitting corrosion on the ultimate capacity of mild steel rectangular plates under biaxial compression, extending earlier results of uniaxially loaded plates. A series of non-linear FEM analysis of plates with partial depth corrosion pits are carried out, changing geometrical attributes of both pits and plates, i.e., the radius, depth and location of pits and the slenderness of plates. Simulation results show that volume loss dominates the degradation of the compressive capacity of pitted mild steel plates as well as loading ratio. Plate slenderness has considerable effect on biaxial interaction curve shape. A regression analysis of FEM results is conducted leading to a closed form formula able to predict the remaining strength of pitting corroded plates, where both volume loss and plate slenderness are taken into account. The proposed formula will facilitate a quick estimation of the remaining strength of pitting corroded plates during lifetime ship design phase which is relevant to maintenance decision-making of aging ship structures and components. © 2012 Elsevier Ltd. All rights reserved.

Clayton D.A.,University of Alabama | Benoist D.M.,University of Alabama | Zhu Y.,University of Alabama | Zhu Y.,Wuhan University of Technology | Pan S.,University of Alabama
ACS Nano | Year: 2010

We present strong photoluminescence from single Ag nanowires (NWs), their disordered blinking behavior, and their dependence on substrate potential. The stochastic bursts (<10 ms) in the photoluminescence trajectories of single Ag NWs in air are observed and attributed to the photoactivated fluorescence silver clusters. The dynamic changes in the photoluminescence are analyzed using autocorrelation function, statistical analysis of the stochastic durations, and probability density function to reveal the disordered nature of the spontaneous photochemical reaction at each individual Ag NWs under laser irradiation. Stable PL is observed for single Ag NWs in alkaline electrolyte and is found to be highly dependent on the electrochemical potential. The PL from single Ag NWs is found to be weakly dependent on polarization direction of the incident light and strongly dependent on the interactions with adjacent NWs. © 2010 American Chemical Society.

Ding A.,North University of China | Wang H.,Wuhan University of Technology
Journal of Ceramic Processing Research | Year: 2010

Lead-free ceramics (1-x)(Na0.5K0.5)NbO3-xBi(Sc0.5Fe0.5)O3 (KNN-BSF, x = 0-0.08) were synthesized by conventional solid-state sintering. A morphotropic phase boundary (MPB) is formed in the ceramics near x = 0.01-0.02 at room temperature by X-ray analysis. Dielectric temperature spectra indicate the existence of two dielectric anomalous peaks, which correspond to orthorhombic-tetragonal (TOT) and tetragonal-cubic (TC) transitions. The ceramic with x = 0.0125 near the MPB exhibits the following optimal electrical properties: Pr = 33.9 μC/cm2, Ec = 18.1 kV/cm, d33 = 255 pC/N, kp = 0.44, and Tc = 372°C.

Winter S.,University of Melbourne | Yin Z.-C.,University of Melbourne | Yin Z.-C.,Wuhan University of Technology
International Journal of Geographical Information Science | Year: 2010

This article studies probabilistic time geography for space-time prisms, that is, for situations where observers know the location of an agent at one time and then again at another time. In the intervening period, the agent would have moved freely, according to its time budget. The article demonstrates that the probability of finding the agent somewhere in the space-time prism is not equally distributed, so any attempt of a quantitative time geographic analysis must consider the actual probability distribution. This article develops, implements, and demonstrates this distribution. A preceding article introduced probabilistic time geography for space-time cones. With cones and prisms, the elementary space-time volumes of time geography are provided. © 2010 Taylor & Francis.

Chen W.,Key Laboratory of Silicate Materials Science and Engineering | Chen W.,Wuhan University of Technology | Brouwers H.J.H.,TU Eindhoven
Cement and Concrete Research | Year: 2010

The alkali-binding capacity of C-S-H in hydrated Portland cement pastes is addressed in this study. The amount of bound alkalis in C-S-H is computed based on the alkali partition theories firstly proposed by Taylor (1987) and later further developed by Brouwers and Van Eijk (2003). Experimental data reported in literatures concerning thirteen different recipes are analyzed and used as references. A three-dimensional computer-based cement hydration model (CEMHYD3D) is used to simulate the hydration of Portland cement pastes. These model predictions are used as inputs for deriving the alkali-binding capacity of the hydration product C-S-H in hydrated Portland cement pastes. It is found that the relation of Na+ between the moles bound in C-S-H and its concentration in the pore solution is linear, while the binding of K+ in C-S-H complies with the Freundlich isotherm. New models are proposed for determining the alkali-binding capacities of C-S-H in hydrated Portland cement paste. An updated method for predicting the alkali concentrations in the pore solution of hydrated Portland cement pastes is developed. It is also used to investigate the effects of various factors (such as the water to cement ratio, clinker composition and alkali types) on the alkali concentrations. © 2010 Elsevier Ltd. All rights reserved.

Xiang Q.,Huazhong Agricultural University | Cheng B.,Wuhan University of Technology | Yu J.,King Abdulaziz University
Angewandte Chemie - International Edition | Year: 2015

The production of solar fuel through photocatalytic water splitting and CO2 reduction using photocatalysts has attracted considerable attention owing to the global energy shortage and growing environmental problems. During the past few years, many studies have demonstrated that graphene can markedly enhance the efficiency of photocatalysts for solar-fuel generation because of its unique 2D conjugated structure and electronic properties. Herein we summarize the recent advances in the application of graphene-based photocatalysts for solar-fuel production, including CO2 reduction to hydrocarbon fuel and water splitting to H2. A brief overview of the fundamental principles for splitting of water and reduction of CO2 is given. The different roles of graphene in these graphene-based photocatalysts for improving photocatalytic performance are discussed. Finally, the perspectives on the challenges and opportunities for future research in this promising area are also presented. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Qi G.,Cornell University | Wang Y.,Wuhan University of Technology | Estevez L.,Cornell University | Switzer A.K.,Cornell University | And 3 more authors.
Chemistry of Materials | Year: 2010

Monodispersed HMSs with tunable particle size and shell thickness were successfully synthesized using relatively concentrated polystyrene latex templates and a silica precursor in a weakly basic ethanol/water mixture. The particle size of the capsules can vary from 100 nm to micrometers. These highly engineered monodispersed capsules synthesized by a facile and scalable process may find applications in drug delivery, catalysis, separationm or as biological and chemical microreactors. © 2010 American Chemical Society.

Guo B.,Wuhan University of Technology
Physics of Plasmas | Year: 2013

Negative refraction in one- and two-dimensional lossless plasma dielectric photonic crystals consisting of plasma and background materials is theoretically investigated and the necessary conditions for negative refraction in these two structures are obtained. The critical frequency ω 0 and the bandwidth Δ ω for negative refraction are explored, and the parameter dependence of effects such as plasma filling factor and the dielectric constant of background materials is also examined and discussed. © 2013 AIP Publishing LLC.

Shang L.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2010

Aimed at the hotpoint of traffic simulation, the author built up the framework of urban microscopic traffic simulation model. The modeling method was illuminated in the paper. Based on the modeling research, a microscopic traffic simulation system has been developed based on the object-oriented technology, dynamic memory management technology and visual reality. In this paper, the system structure and the key technologies of such system were illuminated. In the end, validity of the UMTSS was tested by case study.

Xiao S.,University of North Carolina at Chapel Hill | Xiao S.,Wuhan University of Technology | Stuart A.C.,University of North Carolina at Chapel Hill | Liu S.,University of North Carolina at Chapel Hill | And 2 more authors.
Advanced Functional Materials | Year: 2010

Polycyclic aromatics offer great flexibility in tuning the energy levels and bandgaps of resulting conjugated polymers. These features have been exploited in the recent examples of benzo[2,1-b:3,4-b']dithiophene (BDT)-based polymers for bulk heterojunction (BHJ) photovoltaics (ACS Appl. Mater. Interfaces 2009, 1, 1613). Taking one step further, a simple oxidative photocyclization is used here to convert the BDT with two pendent thiophene units into an enlarged planar polycyclic aromatic ring-fuadrathienonaphthalene (QTN). The reduced steric hindrance and more planar structure promotes the intermolecular interaction of QTN-based polymers, leading to increased hole mobility in related polymers. As-synthesized homopolymer (HMPQTN) and donor-acceptor polymer (PQTN-BT) maintain a low highest occupied molecular orbital (HOMO) energy level, ascribable to the polycyclic aromatic (QTN) moiety, which leads to a good open-circuit voltage in BHJ devices of these polymers blended with PCBM ([6,6]-phenyl-C61-butyric acid methyl ester; HMPQTN: 0.76 V, PQTN-BT: 0.72 V). The donor-acceptor polymer (PQTN-BT) has a smaller optical bandgap (1.6 eV) than that of HMPQTN (2.0 eV), which explains its current (5.69 mA cm-2) being slightly higher than that of HMPQTN (5.02 mA cm-2). Overall efficiencies over 2% are achieved for BHJ devices fabricated from either polymer with PCBM as the acceptor. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.

Shen C.,University of Connecticut | Shen C.,Wuhan University of Technology | Shaw L.L.,University of Connecticut
Journal of Sol-Gel Science and Technology | Year: 2010

This study reveals that Fourier transform infrared is an effective analytical tool in probing the extent of hydrolysis of cerium and gadolinium acetylacetonates dissolved in methanol. It is found that these acetylacetonates have relatively fast hydrolysis rates at the early stage of hydrolysis (<6 h). However, their hydrolysis rates become very slow beyond 6-h of hydrolysis and decrease to near zero after 55-h of hydrolysis. As a result, hydrolysis cannot be completed even after 170 h at room temperature. These phenomena suggest that the first and second acetylacetone ligands chelated to Ce 3+ and Gd3+ ions can actually be hydrolyzed with relative ease at room temperature, similar to alkoxide ligands. It is the last acetylacetone ligand that is very difficult to be hydrolyzed. © 2009 Springer Science+Business Media, LLC.

Luo Y.,Wuhan University of Technology
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2015

Ant colony algorithm is a new approach to solve the job-shop scheduling problem (JSSP). However, there are still some difficulties in solving JSSP by current ant colony algorithm due to the complex attribute of feasible zone, such as the low reliability of convergence and the weak ability of optimization. Facing with the two difficulties above, based on the analysis on the constraints features of machining processes topological sorting, a topological sorting-based two-stage nested ant colony algorithm is proposed. The thinks of the novel methodologies include: the searching range is downsized and the blindness of searching is reduced at a fairly large scale by employing the topological sorting algorithm to limit the majority searching paths, which covers the feasible zone as yet, consequently the reliability of convergence gets improved; The problem is divided into two sub problems of the machining process optimization and the machines selection optimization to construct the mechanism of two-stage optimization. The interaction between the optimization of scheduling and the optimization of machines allocation is realized by two-stage nested recursive algorithm involving majority process flow and branch of machines selection, so that the degree of satisfaction of the solution is effectively improved. The contrastive experiments demonstrate that the novel methodologies used to solve JSSP have higher reliability of convergence, efficiency of searching and the capability for finding better solutions compared to the normal ant colony algorithm. ©2015 Journal of Mechanical Engineering

Yang L.-P.,Wuhan University of Technology
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

The slice block force-displacement method is used to describe the progressive deformation failure stability of slope. The mechanical parameters of limited stress state are adopted to present the behaviors of slice block bottom in the calculation of current slope stability analysis, thus it is feasible for the stability analysis of limited stress state at the residual stress state by numerical simulation. Since the perfect elasto-plastic model is infeasible to describe the progressive failure process of landslide, a constitutive model considering the softening properties of rock-soil mass was used to describe the progressive failure process of slope. The unbalance thrust force method is taken as an example to present the progressive failure process of landslide. The study shows that the stability factors from the comprehensive sliding-resistance force method, main thrust force method, comprehensive displacement method and surplus displacement method are decreased with the deformation development of sliding surface. and the stability factors can be used to evaluate the stability of slope. The main thrust force method and surplus displacement method are simplified and can be applied to the practices. ©, 2015, Northeastern University. All right reserved.

Zhu G.,Wuhan University of Technology | Yin J.-H.,Hong Kong Polytechnic University
International Journal of Geomechanics | Year: 2012

This paper presents several analytical solutions for the consolidation analysis of a soil layer with fairly general laws of variation of permeability and compressibility for both a single-drained condition and a double-drained condition. The solution is described in detail. A normalized time, T, is suggested. The average degree of consolidation exhibiting very good normalized behavior is shown. It is also revealed that the excess pore-pressure distribution of a nonhomogeneous soil layer may be quite different from the conventional Terzaghi's solution. For the double-drained condition, some symmetrical characteristics of the average degree of consolidation and excess pore pressure are proved. Special cases of constant permeability, constant compressibility, or constant coefficient of consolidation, in which the other parameter is depth dependent, are analyzed on the basis of general analytical solutions. Results are presented in figures and tables for practical applications. © 2012 American Society of Civil Engineers.

Liu X.,Wuhan University of Technology
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2010

To study the identification of Liriope spicata var. prolifera and its affinis species, which are difficult to be differentiated with routine method, based on ISSR molecular marker technology and explore their relationship. According to the pre-experiment, to design orthogonal experiment of four levels and five factors to optimize the PCR reaction system. To select randomly 80 primers from ISSR primers sequence table and then screen effective primers from the experiment trough PCR amplifying of all samples. Mark the samples with optimal ISSR conditions, and calculate the similarity coefficient between samples, then build the phylogenetic tree of these samples. The study established a better ISSR reaction system and the PCR amplification procedure for Liriope spicata var. prolifera and its affinis species, screened out 9 effective primers and achieved ISSR electrophoretic spectrum and phylogenetic tree of 15 samples. The established ISSR molecular marker techniques can be used for the researches of identification and genetic relationship for some Liriope and Ophiopogon species.

Lan S.,CAS Wuhan Institute of Hydrobiology | Wu L.,CAS Wuhan Institute of Hydrobiology | Zhang D.,CAS Wuhan Institute of Hydrobiology | Zhang D.,Wuhan University of Technology | Hu C.,CAS Wuhan Institute of Hydrobiology
Plant and Soil | Year: 2012

Aims: In Dalateqi region of Inner Mongolia (at eastern edge of Qubqi Desert), man-made algae crusts were constructed with two filamentous cyanobacteria. Two to three years later, the algae crusts began to succeed to moss crusts under some microterrain conditions. In order to characterize the community structure and compare the photosynthetic characteristics in different successional stages of biological soil crusts (BSCs). Methods: This paper studied composition of photosynthetic organisms and diurnal changes of photosynthetic efficiency, with microscopic observation and chlorophyll fluorescence monitoring techniques. Results: Compared with the early successional algae crusts, later moss crusts had a higher photosynthetic efficiency, which was closely related with the different community structure of photosynthetic organisms. Further, moss crusts had a higher total photosynthetic biomass, although the algal biomass decreased along the successional sequence. Similar to higher vascular plants, a midday depression of photosynthetic efficiency was detected in BSCs, although the depression extents were different in different successional stages. Analysis demonstrated the depression was mainly caused by non-stomata limitations, and photosynthetically active radiation (PAR) was a significant influencing factor in the down-regulation of photosynthetic efficiency. Conclusions: We conclude, cyanobacterial inoculation effectively promotes the formation, development and seccession of BSCs. Furthermore, the later successional BSCs have a better photosynthetic performance and thus are expected to play a more effective role in desertification control. © 2011 Springer Science+Business Media B.V.

Mao X.,Wuhan University | Jiang R.,Wuhan University | Xiao W.,Wuhan University | Yu J.,Wuhan University of Technology
Journal of Hazardous Materials | Year: 2015

Due to the great harm caused by soil contamination, there is an increasing interest to apply surfactants to the remediation of a variety of contaminated soils worldwide. This review article summarizes the findings of recent literatures regarding remediation of contaminated soils/sites using surfactants as an enhancing agent. For the surfactant-based remedial technologies, the adsorption behaviors of surfactants onto soil, the solubilizing capability of surfactants, and the toxicity and biocompatibility of surfactants are important considerations. Surfactants can enhance desorption of pollutants from soil, and promote bioremediation of organics by increasing bioavailability of pollutants. The removal of heavy metals and radionuclides from soils involves the mechanisms of dissolution, surfactant-associated complexation, and ionic exchange. In addition to the conventional ionic and nonionic surfactants, gemini surfactants and biosurfactants are also applied to soil remediation due to their benign features like lower critical micelle concentration (CMC) values and better biocompatibility. Mixed surfactant systems and combined use of surfactants with other additives are often adopted to improve the overall performance of soil washing solution for decontamination. Worldwide the field studies and full-scale remediation using surfactant-based technologies are yet limited, however, the already known cases reveal the good prospect of applying surfactant-based technologies to soil remediation. © 2014 Elsevier B.V.

Lv H.Y.,Wuhan University | Liu H.J.,Wuhan University | Shi J.,Wuhan University | Tang X.F.,Wuhan University of Technology | Uher C.,University of Michigan
Journal of Materials Chemistry A | Year: 2013

The structural and electronic properties of a series of stoichiometric Bi2Te3 nanowires with two growth orientations [110] and [210] are studied by using density functional calculations. Our results indicate that the nanowires with [110] orientation are energetically more favorable than those with [210] orientation. All the investigated Bi2Te3 nanowires are found to be semiconducting and the band gaps of [110] nanowires monotonically increase with the decreasing cross-sectional width. For the [210] orientation, however, the band gaps exhibit an interesting width-dependent even-odd oscillation behavior. The electronic transport properties of these nanowires are then evaluated by using the semi-classical Boltzmann theory with the relaxation time approximation. For the phonon transport, the lattice thermal conductivity is predicted by using the non-equilibrium molecule dynamics simulations. Our theoretical calculations suggest that the thermoelectric performance of Bi2Te3 nanowires can be optimized at appropriate carrier concentration with particular orientation and cross-sectional size. The figure of merit (ZT value) can reach as high as 2.3 at 300 K and 2.5 at 350 K for the [210] nanowire with the width N = 5. © 2013 The Royal Society of Chemistry.

Liu K.Q.,Wuhan University of Technology
Environment, Energy and Applied Technology - Proceedings of the 2014 3rd International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014 | Year: 2015

In this paper, according to the International Maritime Organization (IMO) on the comprehensive safety evaluation report, Giving a detailed analysis about the safety assessment method of ship navigation in a sea ice age, so as to provide the security of ships for sailing in the sea. © 2015 Taylor & Francis Group, London.

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

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

Rooke J.C.,University of Namur | Barakat T.,University of the Littoral Opal Coast | Siffert S.,University of the Littoral Opal Coast | Su B.-L.,University of Namur | Su B.-L.,Wuhan University of Technology
Catalysis Today | Year: 2012

A series of supported Pd catalysts were elaborated using hierarchically porous Nb 2O 5 and Ta 2O 5 materials, synthesised with and without a non-ionic surfactant. The deposition of Pd nanoparticles was achieved using the wet impregnation method on calcined supports. The catalytic systems were pre-reduced in hydrogen and investigated for their efficiency in the total oxidation of toluene and found to have increased activity in comparison to a series of reference catalysts based on hierarchically porous TiO 2 and ZrO 2, with minimal benzene formation. Results have shown how activities are dependent on the support material, synthesis conditions and chemical composition. © 2011 Elsevier B.V.

Liu J.J.,Wuhan University of Technology
Environment, Energy and Applied Technology - Proceedings of the 2014 3rd International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014 | Year: 2015

The VTS simulator system introduced the computer technology and network technology, has realized the ship shore VHF analog communication function, support scientific research function, system network structure of a multi waters multifunction VTS simulation function. © 2015 Taylor & Francis Group, London.

Gong Z.,Wuhan University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

Evaluation of customer value is the basis and core of customer relationship management of shipping enterprises to improve customer management to win the market. Therefore, it is necessary to construct a shipping customer value evaluation system based on BP neural network model, with dealing with non-linear mapping which could satisfactorily describe the non-linear relations between character and diagnosis results to solve the evaluation of customer value of shipping enterprise, which is a kind of problem with various factors, uncertainty and non-linear. The paper designed the BP neural network model, and presented the doable evaluating programs using neural network toolbox in Matlab according to the index system of customer value evaluation. It is proved that the result of shipping customer value evaluated by this model would be objective, dynamic and flexible. © 2014 Springer International Publishing.

Chen X.,New Energy Technologies | Wang G.,Wuhan University of Technology
Physical Chemistry Chemical Physics | Year: 2016

Strain engineering is an effective strategy to tune the electronic, magnetic and optical properties of atomically thin materials like graphene and monolayer transition-metal dichalcogenides (m-TMDs). Using first-principles calculations, we show that strain is also effective for tuning the catalytic activity of m-MS2 (M = Mo or Nb) towards the hydrogen evolution reaction (HER), which is essential for electrochemical hydrogen generation from water splitting. A wide strain range covering both compressive (0-6%) and tensile (0-10%) regions is considered. It is found that biaxial tensile strain can enhance the HER activity more effectively than uniaxial tensile strain, while compressive strain deteriorates the HER activity. Compared with monolayer 1T-NbS2, monolayers 1T-MoS2 and 1H-NbS2 exhibit better strain tunability towards their HER activities since more active sites can be induced with increasing strain. In contrast, monolayer 1H-MoS2 is catalytically inert in the considered strain range because H adsorption is too weak. We demonstrate that tensile strain can lead to decrease of the adiabatic proton affinity but simultaneously a larger magnitude of increase of the adiabatic electron affinity, thus enhancing the catalytic activity. Electronic structure calculations show that tensile strain can activate the relatively inert inner valence electrons and enlarge the d-band exchange splitting, both of which induce destabilization of the system and enhancement of catalytic activity. © the Owner Societies 2016.

Yang S.,Wuhan University of Technology | Song Y.L.,Hubei University of Automotive Technology
Ironmaking and Steelmaking | Year: 2014

The opposed dies shearing process is a precision shearing process and can be applied to low plasticity blanked materials due to its special tool design and process kinematics. In the present study, a two-dimensional (2D) rigid plastic finite element model of opposed dies shearing of an AISI 70 steel blanked part was developed under the DEFORM-2D platform. Based on this model, important field variables such as metal flow velocity field, effective strain and damage variations at the tracking points were investigated in detail. and the cut surface features as well as the forming loads were predicted. The results indicate that the opposed dies shearing process is beneficial in improving the quality of low plasticity blanked parts and prolong the service lives of cutting tools. © 2014 Institute of Materials, Minerals and Mining.

Wu X.,Dalian University of Technology | Wang X.,Wuhan University of Technology | He G.,Dalian University of Technology | Benziger J.,Princeton University
Journal of Polymer Science, Part B: Polymer Physics | Year: 2011

Water sorption, volumetric expansion, and proton conductivity of 1100 EW Nafion and 555 EW sulfonated polyetheretherketone (SPEEK) were compared as functions of water activity at 60 and 80 °C. Water sorption in Nafion occurs with a small positive volume of mixing, ∼0.005 cm3/cm 3. In contrast, water sorption in SPEEK has a large negative volume of mixing ∼-0.05 cm3/cm3. The percolation thresholds for proton conduction occur at hydrophilic volume fractions of 0.10 in Nafion and 0.30 in SPEEK. Proton conductivity increases quadratically with hydrophilic volume fraction above the percolation threshold. The different percolation thresholds suggest the hydrophilic domains in Nafion grow from lamella, whereas the hydrophilic domains in SPEEK grow from spheres. © 2011 Wiley Periodicals, Inc.

Cheng Y.,Wuhan University of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

To improve the embedding capacity of reversible image data hiding method, how to make the prediction error difference histogram chart more compact, higher peak is important. This paper proposed an optimal weight detection (OWD predictor) reversible data hiding method that improves the existing prediction methods, using optimal weights to improve the prediction accuracy of pixel values. Experimental results show that, compared with other reversible data hiding methods, the proposed method significantly improves the embedding capacity while ensured the image quality. © 2015 SPIE.

Fan D.D.,Wuhan University | Liu H.J.,Wuhan University | Cheng L.,Wuhan University | Jiang P.H.,Wuhan University | And 2 more authors.
Applied Physics Letters | Year: 2014

The thermoelectric properties of MoS2 armchair nanoribbons with different width are studied by using first-principles calculations and Boltzmann transport theory, where the relaxation time is predicted from deformation potential theory. Due to the dangling bonds at the armchair edge, there is obvious structure reconstruction of the nanoribbons which plays an important role in governing the electronic and transport properties. The investigated armchair nanoribbons are found to be semiconducting with indirect gaps, which exhibit interesting width-dependent oscillation behavior. The smaller gap of nanoribbon with width N = 4 (Here, N represents the number of dimer lines or zigzag chains across the ribbon width) leads to a much larger electrical conductivity at 300 K, which outweighs the relatively larger electronic thermal conductivity when compared with those of N = 5, 6. As a result, the ZT values can be optimized to 3.4 (p-type) and 2.5 (n-type) at room temperature, which significantly exceed the performance of most laboratory results reported in the literature. © 2014 AIP Publishing LLC.

Lei D.,Wuhan University of Technology | Guo X.,Southwest Jiaotong University
Computers and Operations Research | Year: 2016

Previous studies of two-sided assembly line balancing problem (TALBP) are mainly about the first type of the problem.TALBP-II which is to minimize cycle time for a given number of stations is seldom investigated. In this study an effective variable neighborhood search (VNS) is proposed to solve TALBP-II. A novel two-string representation is used, which is composed of a precedence- based task string and a side selection string. New solutions are produced by using a side selection operator and two precedence-based operators. A novel comparison principle is applied to guarantee the feasibility of the solutions and approximate the optimal solution. VNS is tested on a number of instances and compared with the existing methods. The computational results show the promising advantage of VNS on the considered TALBP-II. © 2016 Elsevier Ltd.

Tian X.Z.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

In the information ages, information-applied technology plays important role to stimulate learners' learning motivations. In order to improve learning efficiency, the author has studied information-applied technology and electronic resource system for autonomous leaning and exploration-internalization mode with its electronic materials. During the study course, some information-applied technology had been investigated and some teaching and learning skills had been introduced. From the investigation and the general introduction, the author had digged out some efficient learning skills and teaching skills with information-applied technology. The author hopes that all of the skills will be helpful for other learners. © (2014) Trans Tech Publications, Switzerland.

Zong X.,Wuhan University of Science and Technology | Xiong S.,Wuhan University of Technology | Fang Z.,Wuhan University
Computers and Operations Research | Year: 2014

A simulation model based on temporal-spatial conflict and congestion for pedestrian-vehicle mixed evacuation has been investigated. Assuming certain spatial behaviors of individuals during emergency evacuation, a discrete particle swarm optimization with neighborhood learning factor algorithm has been proposed to solve this problem. The proposed algorithm introduces a neighborhood learning factor to simulate the sub-group phenomenon among evacuees and to accelerate the evacuation process. The approach proposed here is compared with methods from the literatures, and simulation results indicate that the proposed algorithm achieves better evacuation efficiency while maintaining lower pedestrian-vehicle conflict levels. © 2013 Elsevier Ltd.

Giannakopoulou T.,Advanced Materials and Processes | Todorova N.,Advanced Materials and Processes | Giannouri M.,Advanced Materials and Processes | Yu J.,Wuhan University of Technology | Trapalis C.,Advanced Materials and Processes
Catalysis Today | Year: 2014

Pure TiO2 and ZnO thin films named Ti100 and Zn100 were prepared via sol-gel technique using Ti alkoxide and Zn acetate as metal precursors and dip coating deposition on quartz substrate. Different vol.% ratios of the initial Ti and Zn solutions were used to obtain composite TiO2/ZnO films nominated as Ti25, Ti50 and Ti75. The XRD patterns of pure TiO2 and ZnO films revealed the formation of anatase TiO2 and wurtzite hexagonal ZnO, respectively. The patterns of the composite film Ti75 were similar to the pure TiO2, while the composite films Ti25 and Ti50 revealed amorphous structure. The XPS analysis proved presence of TiO 2 and ZnO oxide phases in the pure and composite films that is in accordance with XRD analysis. The UV-vis transmission spectra of the films showed that absorption edges of the composite films were blue shifted in comparison with the pure films. The largest shift was attained in the Ti25 composite film. The Forouhi-Bloomer (FB) and Tauc-Lorentz (TL) dispersion models were used for description of the complex refractive index of the films and for estimation of their thickness and energy band gap. The refractive index in the films' transparency region and high energy region increased with the increase of TiO2 phase content. The thickness of the films also increased with the increase of TiO2 content. The pure TiO2 film was approximately 2.5 times thicker (145 nm) than the pure ZnO film (60 nm). The estimation of the energy gaps showed comparable gap value of ∼3.2 eV for the pure oxide films. The largest value of ∼3.8 eV was calculated for the Ti25 composite film. A good agreement between the two models was observed in the estimation of gap and thickness values. For pure ZnO film, better accordance between experimental and theoretical transmittance spectra was achieved via FB model simulations in the region above the band gap. The photocatalytic properties of the films in air purification were investigated via standard NO oxidation procedure. The Ti100 and Ti75 films exhibited improved performance in comparison to Ti25 and Zn100 films. The highest photocatalytic efficiency of 1.6 × 10-2 mol/einstein in NO oxidation was recorded for pure TiO2 film. Also, the latter showed the highest hydrophylicity without and under UV illumination. © 2013 Elsevier B.V.

Xia D.,Wuhan University of Technology | Chen B.,Qufu Normal University | Chen B.,University of Warwick
Expert Systems with Applications | Year: 2011

Risk management of a supply chain (SC) has a great influence on the stability of dynamic cooperation among SC partners and hence very important for the performance of the SC operations as a whole. A suitable decision-making model is the cornerstone for the efficiency of SC risk management. We propose in this paper a decision-making model based on the internal triggering and interactive mechanisms in an SC risk system, which takes into account dual cycles, the operational process cycle (OPC) and the product life cycle (PLC). We explore the inter-relationship among the two cycles, SC organizational performance factors (OPF) and available risk operational practice (ROP), as well as the risk managerial elements in OPC and PLC. In particular, three types of relationship, bilateral, unilateral and inter-circulative ones, are analyzed and verified. We build this dynamic relation into SC risk managerial logic and design a corresponding decision-making path. Based on the analytic network process (ANP), a methodology is designed for an optimal selection of risk management methods and tools. A numerical example is provided as an operational guideline for how to apply it to tailor operational tactics in SC risk management. The results verify that this strategic decision model is a feasible access to the suitable risk operational tactics for practitioners. © 2010 Elsevier Ltd. All rights reserved.

Zhou X.,University of Chinese Academy of Sciences | Xia L.,University of Chinese Academy of Sciences | Ge H.,University of Chinese Academy of Sciences | Zhang D.,Wuhan University of Technology | Hu C.,University of Chinese Academy of Sciences
Bioresource Technology | Year: 2013

Chlorella sp. (FACHB-1748) was cultivated outdoors under natural sunlight to evaluate its potential for biofuel production. Urea was selected as nitrogen source, and the concentration was optimized. When the culture reached the late exponential stage, a triggering lipid accumulation test was conducted using different concentrations of sodium chloride and acetate. A scaling-up experiment was also conducted in a 70. L photobioreactor. The highest biomass productivity (222.42, 154.48. mg/L/d) and lipid productivity (64.30, 33.69. mg/L/d) were obtained with 0.1. g/L urea in 5 and 70. L bioreactors, respectively. The highest lipid content (43.25%) and lipid yield (1243.98. mg/L) were acquired with the combination of 10. g/L sodium chloride and acetate. Moreover, the qualities of biodiesel, cetane number, saponification value, iodine value, and cold filter plugging point complied with the standards set by the National Petroleum Agency (ANP255), Standard ASTMD6751, and European Standard (EN 14214). © 2013 Elsevier Ltd.

Dapsens P.Y.,University of Namur | Hakim S.H.,Iowa State University | Su B.-L.,University of Namur | Su B.-L.,Wuhan University of Technology | Shanks B.H.,Iowa State University
Chemical Communications | Year: 2010

The current work presents an unprecedented direct observation of macropore formation in the spontaneous self-assembly process to obtain hierarchical meso/macroporous metal oxides made possible with the help of an unusual titanium alkoxide. © 2010 The Royal Society of Chemistry.

Hill C.M.,University of Alabama | Zhu Y.,University of Alabama | Zhu Y.,Wuhan University of Technology | Pan S.,University of Alabama
ACS Nano | Year: 2011

We present electrochemical studies of graphene oxide (GO) nanosheets and demonstrate the fluorescence and electrogenerated chemiluminescence quenching capability of GO nanosheets that are transferred into chloroform from aqueous solution utilizing a novel, surfactant-assisted method. Electrochemical studies indicate that GO can be reduced upon charge injection. Fluorescence quenching of the conjugate polymer poly (3-hexylthiophene) (P3HT) in both solution and solid films is demonstrated to show that GO can be used as an electron acceptor in a bulk heterojunction organic photovoltaic (OPV) device. OPV devices were then fabricated with an ITO/PEDOT:PSS/P3HT-GO/Al structure. Devices containing GO exhibited an increase in short-circuit current (Isc) and conductivity but a decrease in open circuit potential (Voc). These results display the potential for nonorganically functionalized GO to be used as an acceptor material in future OPV devices. The results also indicate that GO can increase the conductivity of the nanocomposite film so that charge recombination is an issue in such a device. The increased conductivity and fluorescence quenching are also supported by electrogenerated chemiluminescence (ECL) of P3HT/GO composite films. © 2011 American Chemical Society.

Wu R.-J.,Tongji University | Zheng B.-L.,Tongji University | He P.-F.,Tongji University | Tan Y.-G.,Wuhan University of Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

As the package structures of a sensor seriously interfere the strain responses measured by a Fiber-optic Bragg Grating(FBG), this paper focuses on the relationship of measured strain and true strain in the actual measurement. It establishes a strain transfer function for embedded FBG sensors and verifies the validity of the transfer function and the influence of different parameters on the measured strain. Firstly, based on mechanical characteristics of embedded FBG sensors, the shear stress distribution with a form of polynomial is presented, then the strain transfer function is established and verified by taking a numerical method and an experiment. Finally the influence of sensor length, cementation layer modulus and cementation layer thickness on the measured strain is analyzed. Experimental results indicate that the strain transfer function is valid. Moreover, the thinner the cementation thickness and the higner the cementation modulus are, the more convenient the strain transfer is. The strain transfer function satisfies the accuracy requirement of embedded FBG sensors because the calculation error is controlled within 5%, which is considered as a guidance for its practical application.

Li H.,Zhejiang Normal University | Li H.,Ohio State University | Li C.-J.,Zhejiang Normal University | Wu X.-J.,Wuhan University of Technology | Sun J.,Zhejiang Normal University
Applied Soft Computing Journal | Year: 2014

Support vector machine (SVM) is an effective tool for financial distress identification (FDI). However, a potential issue that keeps SVM from being efficiently applied in identifying financial distress is how to select features in SVM-based FDI. Although filters are commonly employed, yet this type of approach does not consider predictive capability of SVM itself when selecting features. This research devotes to constructing a statistics-based wrapper for SVM-based FDI by using statistical indices of ranking-order information from predictive performances on various parameters. This wrapper consists of four levels, i.e., data level, model level based on SVM, feature ranking-order level, and the index level of feature selection. When data is ready, predictive accuracies of a type of SVM model, i.e., linear SVM (LSVM), polynomial SVM (PSVM), Gaussian SVM (GSVM), or sigmoid SVM (SSVM), on various pairs of parameters are firstly calculated. Then, performances of SVM models on each candidate feature are transferred to be ranking-order indices. After this step, the two statistical indices of mean and standard deviation values are calculated from ranking-order information on each feature. Finally, the feature selection indices of SVM are produced by a combination of statistical indices. Each feature with its feature selection index being smaller than half of the average index is selected to compose the optimal feature set. With a dataset collected for Chinese FDI prior to 3 years, we statistically verified the performance of this statistics-based wrapper against a non-statistics-based wrapper, two filters, and non-feature selection for SVM-based FDI. Results from unseen dataset indicate that GSVM with the statistics-based wrapper significantly outperformed the other SVM models on the other feature selection methods and two wrapper-based classical statistical models. © 2014 Elsevier B.V.

Zhang Q.,Wuhan University of Technology | Kano J.,Tohoku University
Bioresource Technology | Year: 2016

A new process to produce hydrogen efficiently from sewage sludge (SWS) was developed with co-grinding operation of the dried SWS with calcium and nickel hydroxides (Ca(OH)2 and Ni(OH)2) and subsequent heating of the ground mixture at relatively low temperature below 600°C. A set of analytical methods were used to characterize the ground samples before heating and the gaseous and solid products after heating. Thermo-mass spectroscopic (TG-MS) analysis showed hydrogen occurrence around 450°C. Hydrogen yield over 70 g per kg SWS with concentration of 93.6% was obtained with the hydroxide additions of Ca to C from SWS at 1:1 and Ni to C at 1:6, respectively. X-ray diffraction (XRD) analysis of the solid residues after heating confirmed the existences of calcium carbonate and nickel metal. Based on the obtained results, possible reaction pathway was proposed. © 2015 Elsevier Ltd.

Mou J.M.,Wuhan University of Technology | Tak C.v.d.,Maritime Research Institute Netherlands | Ligteringen H.,Technical University of Delft
Ocean Engineering | Year: 2010

Due to high density of vessel traffic, busy waterways are water areas with high potential for collisions. The application of AIS makes it possible to investigate accurate and actual behavior of collision-involved ships, and benefits vessel traffic management and waterways design for these areas. As a case study, the authors focus on a Traffic Separation Scheme (TSS) off Rotterdam Port in Europe, and using AIS data, statistical analysis is made for collision involved ships. In order to identify the correlation of CPA, which is a key indicator for collision avoidance, with ship's size, speed, and course, linear regression models are developed. To assess risks, a dynamic method based on SAMSON is presented. © 2010 Elsevier Ltd. All rights reserved.

Peng K.,Wuhan University of Technology
Sensors and Transducers | Year: 2014

HHT method has been used to decompose the health monitoring data and the EMD signal decomposition to reveal the internal characteristics of bridge monitoring data, so that to get more reliable data of the amplitude and frequency. The amplitude and frequency variation in the monitoring process is calculated so as to judge the health of the bridge. It innovatively applies the segment data to make comparisons, accurately locates the specific data segment with structural damage and provides the simultaneous monitoring scheme while reducing the amount of calculation. © 2014 IFSA Publishing, S. L.

Lu H.M.,Wuhan University of Technology
Green Building, Materials and Civil Engineering - Proceedings of the 4th International Conference on GreenBuilding, Materials and Civil Engineering, GBMCE 2014 | Year: 2015

From the analysis of the realistic movie “Under the Hawthorn Tree” and the science fiction film “Avatar”, this paper conclude that the image authenticity include not only the physical reality, but also the real emotion. Moreover, the real emotion is the foundation and core of the image creation. The true feeling of image is the image reality that transcend the material level and get to the psychological level. The true feeling of image is the cultural authenticity that possess the broader senses and universal values. Only basing on the authenticity of emotion, can the image be excellent image. © 2015 Taylor & Francis Group, London.

Hou X.-W.,Central China Normal University | Huang J.,Central China Normal University | Wan M.-F.,Wuhan University of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

In this Brief Report an improved u(2) algebraic model is proposed to study both stretching and bending vibrational spectra of a bent triatomic molecule. The model with fewer parameters is used to reproduce the observed spectra of hydrogen sulfide (H 2S) with better precision than the u(4) algebraic model. Furthermore, the tripartite entanglement dynamics is investigated for vibrationally localized states in H 2S. It is shown that the entanglement of a highly excited state in the bending mode displays better quasiperiodicity than that in the stretch. Those are useful for molecular vibrations and multipartite quantum entanglement. © 2012 American Physical Society.

Fan Q.-J.,Wuhan University of Technology
International Journal of Bifurcation and Chaos | Year: 2012

In this paper, we study the chaotic dynamics of a voltage-mode controlled buck converter, which is typically a switched piecewise linear system. For the two-dimensional hybrid system, we consider a properly chosen cross-section and the corresponding Poincaré map, and show that the dynamics of the system is semi-conjugate to a 2-shift map, which implies the chaotic behavior of this system. The essential tool is a topological horseshoe theory and numerical method. © 2012 World Scientific Publishing Company.

Wu J.,Wuhan University of Technology | Wu J.,Liuzhou Teacher College
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

In this paper, a new approach using an Modular Radial Basis Function Neural Network (M-RBF-NN) technique is presented to improve rainfall forecasting performance coupled with appropriate data-preprocessing techniques by Singular Spectrum Analysis (SSA) and Partial Least Square (PLS) regression. In the process of modular modeling, SSA is applied for the time series extraction of complex trends and finding structure. In the second stage, the data set is divided into different training sets by used Bagging and Boosting technology. In the third stage, then modular RBF-NN predictors are produced by different kernel function. In the fourth stage, PLS technology is used to choose the appropriate number of neural network ensemble members. In the final stage, least squares support vector regression is used for ensemble of the M-RBF-NN to prediction purpose. The developed RBF-NN model is being applied for real time rainfall forecasting and flood management in Liuzhou, Guangxi. Aimed at providing forecasts in a near real time schedule, different network types were tested with the same input information. Additionally, forecasts by M-RBF-NN model were compared to the convenient approach. Results show that that the predictions using the proposed approach are consistently better than those obtained using the other methods presented in this study in terms of the same measurements. Sensitivity analysis indicated that the proposed M-RBF-NN technique provides a promising alternative to rainfall prediction. © 2012 Springer-Verlag.

Huang H.,Soochow University of China | Xie J.,Soochow University of China | Xie J.,Wuhan University of Technology | Chen H.,Soochow University of China
Analyst | Year: 2011

The time-dependent adsorption behavior of human serum albumin (HSA) onto an ATR (ZnSe) crystal was investigated by two-dimensional (2D) correlation analysis and in situ ATR-FTIR spectroscopy following the secondary structural changes in the amide I region. The two major advantages of the generalized 2D correlation spectroscopy were first tested. New extra bands have been resolved by 2D correlation analysis, but they are either artifacts or a result of uncertainty on band position in generalized 2D correlation spectroscopy. The sequence of the intensity variations of the three sub-bands under the amide I band profile deduced from the 'sequential order' rules is contradictory to the experimental observation, which supports our argument on the 'sequential order' rules in generalized 2D correlation spectroscopy (H. Huang, Anal. Chem., 2007, 79, 8281-8292). Subsequent detailed analysis on the in situ ATR-IR spectra shows that the adsorption process of HSA on the ATR (ZnSe) crystal in aqueous solutions can be divided into three stages: no obvious conformational transitions in the first 25 min of adsorption of HSA molecules; large structural rearrangement from α-helix to random coil and short extended chain structures in a fully cooperative way from 25 to 50 min of adsorption; and further slight conformational transformation of short extended chain and turn structures into random coil with no sequential order after 50 min of adsorption. © 2011 The Royal Society of Chemistry.

Lei D.,Wuhan University of Technology | Guo X.,Southwest Jiaotong University
International Journal of Production Research | Year: 2012

Fuzziness and flexibility are the features of most production processes; however, the scheduling problems with both flexible process plans and fuzzy processing conditions are not investigated fully for high complexity. This paper proposes an efficient swarm-based neighbourhood search algorithm (SNSA) for the fuzzy flexible job shop scheduling problem. In SNSA, ordered operation-based representation is used to indicate the solution of operation sequence sub-problem and machine assignment sub-problem is converted into a cell formation one, in which machines are regarded as cells and operations are allocated into cells. In each generation, two swaps, an insertion and tournament selection are applied to update swarms. Some numerical experiments are conducted by using some instances to show the effectiveness of SNSA. Computational results show that SNSA performs better than the existing methods from literature. © 2012 Copyright Taylor and Francis Group, LLC.

Tong G.,Zhejiang Normal University | Liu Y.,Zhejiang Normal University | Guan J.,Wuhan University of Technology
Journal of Alloys and Compounds | Year: 2014

A novel and versatile gas bubble-assisted self-assembly technique was developed for the first-time preparation of Co3O4 nanobowl arrays by the rapid thermal decomposition of Co(NO3) 2×6H2O on a flat substrate. The morphological modulation from novel nanobowl arrays, to nanotube arrays, to nanorods, and even to microspheres can be realized by only tuning decomposition temperature from 150 C to 700 C. The in situ generated (O2, H2O, NO 2) bubbles guided the growth of Co3O4 nuclei, resulting in the final morphology of Co3O4 nanostructures. The Co3O4 nanostructures were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption isotherms. Analysis of electrochemical properties revealed that Co 3O4 nanobowl and nanotube arrays obtained at low temperatures displayed significant enhancement of electrochemical activity because of low crystallization, small grain size, high specific surface area, and hierarchically porous structure. This simple process was applicable to large-scale production and may be extended to other materials. The porous/hollow structure and high specific surface area of the as-obtained Co 3O4 nanobowl and nanotube arrays can enable their potential use in catalysis, chemical sensing, luminescence, energy storage, controlled release, and cellular applications. © 2014 Elsevier B.V. All rights reserved.

Zhao Y.,Inner Mongolia University of Science and Technology | Hao X.,Inner Mongolia University of Science and Technology | Zhang Q.,Wuhan University of Technology | Zhang Q.,Cranfield University
ACS Applied Materials and Interfaces | Year: 2014

Antiferroelectric (AFE) thick (1 μm) films of Pb (1-3x/2)LaxZr0.85Ti0.15O 3 (PLZT) with x = 0.08, 0.10, 0.12, and 0.14 were deposited on LaNiO3/Si (100) substrates by a sol-gel method. The dielectric properties, energy-storage performance, electrocaloric effect, and leakage current behavior were investigated in detail. With increasing La content, dielectric constant and saturated polarizations of the thick films were gradually decreased. A maximum recoverable energy-storage density of 38 J/cm3 and efficiency of 71% were achieved in the thick films with x = 0.12 at room temperature. A large reversible adiabatic temperature change of δT = 25.0 °C was presented in the thick films with x = 0.08 at 127 °C at 990 kV/cm. Moreover, all the samples had a lower leakage current density below 10-6 A/cm2 at room temperature. These results indicated that the PLZT AFE thick films could be a potential candidate for applications in high energy-storage density capacitors and cooling devices. © 2014 American Chemical Society.

Ko H.-H.,Kaohsiung Medical University | Hsi C.-S.,National United University | Wang M.-C.,Kaohsiung Medical University | Zhao X.,Wuhan University of Technology
Journal of Alloys and Compounds | Year: 2014

The nanocrystallite growth of TiO2 surface modification with 9 mol% ZnO prepared by a coprecipitation process has been studied. Thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and UV-VIS-NIR spectrophotometry have been utilized to characterize the TiO2 nanocrystallites surface modification with 9 mol% ZnO (denoted by T-9Z). The DTA result shows that the anatase TiO 2 first formed at 533 K and the completion of anatase TiO2 crystallization occurred at 745 K for the T-9Z freeze-dried precursor powders. XRD results reveal that the anatase and rutile TiO2 coexist when the T-9Z freeze-dried precursor powders were calcined at 523-973 K for 2 h. When the T-9Z freeze-dried precursor powders were calcined at 973 K for 2 h, rutile TiO2 was the major phase, and the minor phases were anatase TiO 2 and Zn2Ti3O8. The phase was composed of the rutile TiO2 and Zn2TiO4 for the T-9Z freeze-dried precursor powders after calcination at 1273 K for 2 h. The growth kinetics of TiO2 nanocrystallites in T-9Z powders were described as: DA,92=2.42×105×exp(-39.9×10 3/RT)and DR,92=8.49×105×exp(-47. 6×103/RT) for anatase and rutile TiO2 nanocrystallites respectively. The analysis results of UV/VIS/NIR spectra reveal that the T-9Z freeze-dried precursor powders after calcination have a red-shifted effect with increasing calcination temperature and can be used as a UVA-attenuating agent. © 2013 Elsevier Ltd. All rights reserved.

Chen Y.,Hubei University | Zeng S.,Hubei University | Qian J.,Hubei University | Wang Y.,Wuhan University of Technology | And 3 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Si has been considered as a promising alternative anode for next-generation lithium ion batteries (LIBs), but the commercial application of Si anodes is still limited due to their poor cyclability. In this paper, we propose a new strategy to enhance the long-term cyclability of Si anode by embedding nano-Si particles into a Li+-conductive polymer to form a Si/polymer composite with core-shell structure, in which nano-Si cores act as active Li-storage phase and the polymeric matrix serves not only as a strong buffer to accommodate the volume change, but also as a protection barrier to prevent the direct contact of Si surface with electrolyte, so as to maintain the mechanical integrity of Si anode and suppress the repeated destruction and construction of solid electrolyte interphase (SEI) on the Si surface. To realize this strategy, we synthesize a Si/PPP (polyparaphenylene) composite simply by ball-milling the Si nanoparticles with PPP polymer that has n-doping activity. Our experimental results demonstrate that the thus-prepared Si/PPP composite exhibits a high capacity of 3184 mA h g-1 with an initial coulombic efficiency of 78%, an excellent rate capability with a considerably high capacity of 1670 mA h g-1 even at a very high rate of 16 A g-1, and a long-term cyclability with 60% capacity retention over 400 cycles, showing a great prospect for battery application. In addition, this structural design could be adopted to other Li-storable metals or alloys for developing cycle-stable anode materials for Li-ion batteries. © 2014 American Chemical Society.

Lu J.,Shenyang University of Chemical Technology | Lu J.,Curtin University Australia | Tang H.,Wuhan University of Technology | Xu C.,Guangzhou University | Jiang S.P.,Curtin University Australia
Journal of Materials Chemistry | Year: 2012

Ordered mesoporous structures were successfully introduced into Nafion membranes via a soft micelle templating method, using a non-ionic block copolymer surfactant, PEO 127-PPO 48-PEO 127 (Pluronic F108). Atomic force microscopy (AFM) and small angle X-ray scattering (SAXS) analysis show the typical features of the formation of ordered mesopores in the as-prepared Nafion membranes. TGA and FTIR results show that the mesoporous Nafion (meso-Nafion) has a much higher water retention capability as compared to conventional Nafion membranes. The proton conductivities of meso-Nafion are much higher than those of Nafion 115 membranes especially at reduced relative humidity (RH) and elevated temperatures. The results show that the conductivity and water retention ability are sensitive to the surfactant loading. At 80 °C and 40%RH, the conductivity of the best meso-Nafion membrane is 0.07 S cm -1, 5 times better than 0.013 S cm -1 obtained on Nafion 115. At 60%RH and 80 °C, the cell with meso-Nafion reached a stable power output of 0.63 W cm -2, more than 2 times higher than the cell with pristine Nafion 115 under identical experimental conditions. When the RH reduced to 20%, the power output of meso-Nafion membranes is 5.6 times higher than that of Nafion 115. The cells with meso-Nafion membranes also demonstrate much better power output at elevated temperature of 120 °C and reduced humidity. © The Royal Society of Chemistry 2012.

Wang C.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2014

This paper summarizes the application of virtual simulation in the shipbuilding industry, especially points out research status of the key resources of shipbuilding (Ship Dock). Finally, the idea is put forward that a virtual simulation based on both intelligent algorithm and QUEST to improve the efficiency of ship dock. © (2014) Trans Tech Publications, Switzerland.

Xiao M.,Hunan University | Xiao M.,Changsha University of Science and Technology | Lin Y.,Building Solutions Inc. | Lin Y.,Wuhan University of Technology | And 2 more authors.
Renewable and Sustainable Energy Reviews | Year: 2014

Green roof is an effective energy efficiency measure to reduce the building cooling load in summer and heating load in winter, in addition, it can add ecological benefit and landscape value to the community. Therefore, it has attracted extensive attention worldwide. This paper studies the selection of planting materials, plant configuration patterns and plant growth medium of the green roofs in China, and presents the researches on ecological benefits, thermal performance, and applications of the green roofs in China. This paper also introduces and analyzes the green roofs development policies in China, including the incentive mechanism, laws and regulations, and finally presents the analysis and suggestions on their application prospects. © 2014 Elsevier Ltd.

Lei D.,Wuhan University of Technology
International Journal of Advanced Manufacturing Technology | Year: 2011

The problem of scheduling stochastic job shop subject to breakdown is seldom considered. This paper proposes an efficient genetic algorithm (GA) for the problem with exponential processing time and non-resumable jobs. The objective is to minimize the stochastic makespan itself. In the proposed GA, a novel random key representation is suggested to represent the schedule of the problem and a discrete event-driven decoding method is applied to build the schedule and handle breakdown. Probability stochastic order and the addition operation of exponential random variables are also used to calculate the objective value. The proposed GA is applied to some test problems and compared with a simulated annealing and a particle swarm optimization. The computational results show the effectiveness of the GA and its promising advantage on stochastic scheduling. © 2011 Springer-Verlag London Limited.

He W.,Old Dominion University | Xu L.,Old Dominion University | Xu L.,Wuhan University of Technology
Expert Systems with Applications | Year: 2011

Case-based reasoning (CBR), as a promising technology for problem solving and decision support, has drawn considerable attention during the last 20 years. As CBR systems become more frequently deployed in real-world situations and as large-scale case-bases become more commonly used in practice, the development and maintenance of the case-base becomes critical to CBR practitioners. In reality, adding cases to a case-base and updating cases in a case-base can be troublesome and time-consuming processes. It has become increasingly important for CBR practitioners to be able to implement an efficient way to develop and maintain the case base. However, techniques for case-base development and maintenance (such as adding cases and updating cases) have not received enough attention and are often neglected by CBR researchers. This paper discusses Wikis and XML (specifically, the Office Open XML format) and proposes an integrated approach to facilitate case-base development and maintenance in adding cases and in updating cases. © 2011 Elsevier Ltd. All rights reserved.

Lei D.,Wuhan University of Technology
Computers and Industrial Engineering | Year: 2011

This paper applies interval number theory to production scheduling for its advantage in uncertainty modeling. A job shop scheduling problem with interval processing time is first described and then a population-based neighborhood search (PNS) is presented to optimize the interval makespan of the problem. In PNS, an ordered operation-based representation is used and a decoding procedure is constructed by using operations of interval numbers, in which there are no approximate treatments. It is proved that the possible actual makespan of each schedule are contained in its interval makespan. A swap operation and binary tournament selection are applied to update the population. PNS is finally tested by using some instances and computational results show that PNS can provide better results than some methods from the literature. © 2011 Elsevier Ltd. All rights reserved.

Lei D.,Wuhan University of Technology
International Journal of Advanced Manufacturing Technology | Year: 2011

Fuzzy job shop scheduling problem with preventive maintenance (FJSSP-PM) is seldom investigated. In this paper, FJSSP-PM with n resumable jobs processed on m machines are considered and an efficient swarm-based neighborhood search (SNS) is proposed, in which an ordered operation-based representation and the decoding procedure incorporating PM are given. Swap operation and binary tournament selection are applied to update the swarm of SNS for the best solutions of the problem. It is also proved that most of possible actual completion times lie in the cut of fuzzy completion time for each job. SNS is finally compared with some methods from literature and computational results demonstrate that SNS has promising advantage on fuzzy scheduling with PM. © Springer-Verlag London Limited 2010.

Tong G.,Zhejiang Normal University | Tong G.,Hong Kong Baptist University | Hu Q.,Zhejiang Normal University | Wu W.,Zhejiang Normal University | And 3 more authors.
Journal of Materials Chemistry | Year: 2012

A facile template-free and one-pot thermal decomposition approach was used for the mass preparation of submicrometer-sized NiO octahedra. Ni octahedra with tailored crystallization and texture characteristics are easily achieved through H 2-annealing of NiO octahedra at various temperatures. The good morphology retention of Ni octahedra is due to the principle of minimum surface free energy as well as the similar crystallographic system to that of NiO. Studies on static magnetic and microwave electromagnetic properties reveal the relationships among the reactivity, shape, and resultant properties of the nanomaterials. Because of their high BET specific surface area and favorable crystal size, porous Ni octahedra produced at 300 °C exhibit excellent matching and absorbing properties with a minimum R L value of -37.93 dB at 12.80 GHz and 11.60 GHz bandwidth (below -20 dB). Thus the Ni octahedra described here are believed to have a wide range of applications, including catalysis, electromagnetic shielding, and absorption. © 2012 The Royal Society of Chemistry.

Zhang B.J.,Wuhan University of Technology
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2012

To study the pharmacokinetics of long-circulating beta-elemene liposomes. Gas chromatography was established to determine the concentration of beta-elemene in plasma of rats. The alpha, T(1/2beta), K12 and AUC of long-circulating beta-elemene liposomes groups were higher compared with those of the conventional liposomes,and the T(1/2alpha), Vc, CL, K10 of the latter were lower. Long-circulating beta-elemene liposomes can prolong the duration of beta-elemene in the body and improve the efficacy of drugs.

Fan X.,Wuhan University of Technology
Advanced Materials Research | Year: 2011

The paper researched the electrical properties of carbon fiber graphite cement-matrix composites(CFGCC) containing carbon fiber 0.5% (mass fraction of cement, the same below) and graphite powder 0%~30%, and the impact of environmental temperature(10~50°C) and relative humidity (20%~60%) to electrical properties of CFGCC by the four-probe method and KSON high and low temperature environmental chambers. The results have shown: the electrical resistivity of CFGCC decreases with increasing the content of graphite; the relationship curve of electrical resistivity and concentration of graphite exists percolation phenomena, the percolation threshold of CFGCC is about 25%; the electrical resistivity of CFGCC have decreased with increasing temperature; the variation rate of electrical resistivity have decreased with increasing the contents of graphite; the electrical resistivity have changed a little as the humidity changed, and the trend is towards smaller as a whole. © (2011) Trans Tech Publications.

Lemaire A.,University of Namur | Su B.-L.,University of Namur | Su B.-L.,Wuhan University of Technology
Langmuir | Year: 2010

A novel yet facile synthesis pathway has been developed for the design of hierarchically structured macro-mesoporous aluminosilicates with high aluminum content at tetrahedral sites using a single molecular bifunctional alkoxide (sec-BuO)2-Al-O-Si(OEt)3 precursor. The use of carboxylate ligands and a highly alkaline media slow down the polymerization rate ofthe aluminum alkoxide functionality, thus permitting the preservation ofthe intrinsic Al-O-Si linkage. The hierarchically structured porous aluminosilicate materials present an unprecedented low Si/Al ratio close to 1. Heat treatment applied to the synthesized material seems to favor the incorporation of aluminum into tetrahedral position (intraframework aluminum species). The macro-mesoporosity was spontaneously generated, without the use of any external templating agent, bythe hydrodynamic flow ofthe solvents released during the rapid hydrolysis and condensation processes of this double alkoxide. This method results in materials with an open array of interconnected macrochannels. The synthesized aluminosilicate materials with tailorable macro-mesoporous hierarchy and very high Al content at tetrahedral position hold huge promise in various applications as catalysts, catalysts supports, or adsorbents. © 2010 American Chemical Society.

He H.,University of Rhode Island | Ni Z.,University of Rhode Island | Fu J.,Wuhan University of Technology
Neurocomputing | Year: 2012

In this paper, we propose a novel adaptive dynamic programming (ADP) architecture with three networks, an action network, a critic network, and a reference network, to develop internal goal-representation for online learning and optimization. Unlike the traditional ADP design normally with an action network and a critic network, our approach integrates the third network, a reference network, into the actor-critic design framework to automatically and adaptively build an internal reinforcement signal to facilitate learning and optimization overtime to accomplish goals. We present the detailed design architecture and its associated learning algorithm to explain how effective learning and optimization can be achieved in this new ADP architecture. Furthermore, we test the performance of our architecture both on the cart-pole balancing task and the triple-link inverted pendulum balancing task, which are the popular benchmarks in the community to demonstrate its learning and control performance over time. © 2011 Elsevier B.V.

Xu F.,Hubei Engineering University | Zhou M.,Wuhan University of Technology | Chen J.,Hubei Engineering University | Ruan S.,Hubei Engineering University
Construction and Building Materials | Year: 2014

For the purpose of effectively dealing with the brittleness and inferior dynamics performance of cement concrete overlay in pavement, this paper proposed a new kind of cement concrete road overlay material comprised of polyester fiber and SBR latex, which is called fiber and polymer compound-modified concrete (FPMC). An experimental test procedure including compressive strength, flexural strength, flexural toughness and impact resistance in this article was investigated. The compound modification mechanism of polyester fiber and SBR latex on mechanical properties of FPMC was surveyed by quantitative analysis in a micro-level, incorporating the measurement of chemical bonding water amount, XRD and SEM. The results indicated that the mechanical properties of FPMC were the most optimal at 0.14 vol.% of polyester fiber and at 90 kg/m3 of SBR latex, and there is an obvious compound effect of polyester fiber and SBR latex on the mechanical properties of FPMC correspondingly. The results of microscopic tests obtained showed that SBR latex took no significant effect on cement hydration in the long-term. Besides, continuous SBR latex films formation presented in cement substrate makes it possible to raise toughness and compact degree of interface transition zone (ITZ). Further, SBR latex trigger polyester fiber and cement paste to lead to a tight mutual connection. © 2014 Elsevier Ltd. All rights reserved.

Li S.,Wuhan University of Technology | Zhou M.,Wuhan Wutos Co Ltd
Photonic Sensors | Year: 2014

In order to ensure the testing range and long-term reliability of the fiber Bragg grating (FBG) used for the smart cable, a smart cable embedded with FBG strain sensors based on the desensitized encapsulation structure was designed. For a smart cable specimen, the fatigue loading experiments with the cycle from 100 thousands to 2 million and 0.95 times nominal breaking cable force (P b ) were carried out, which tested the long-serving effects of the smart cable. The test results of the static tension loading and unloading during the stepwise fatigue cycle process showed that the encapsulated FBG strain sensors had the good linearity and repeatability. Also all sensors survived after 2 million times fatigue cycle. 0.95P b static tension test showed that the encapsulated FBG strain sensors embedded inside the cable reached 4.5% testing accuracy in the 0.86P b working range. After 0.95P b static tension test, the dissection test was carried out by breaking the force tension. The results showed that the appearances of the encapsulated sensors were good, and the design structures were not changed and damaged. © 2014 The Author(s).

Tong H.,CAS Changchun Institute of Applied Chemistry | Tong H.,Wuhan University of Technology | Wang Y.,CAS Changchun Institute of Applied Chemistry | Liao W.,CAS Changchun Institute of Applied Chemistry | Li D.,CAS Changchun Institute of Applied Chemistry
Separation and Purification Technology | Year: 2013

The synergistic effect of mixtures of Cyanex 923 and organophosphorus acids including P204, P507 and Cyanex 272 in extraction of Ce(IV) and Th(IV) from sulfuric acid solutions has been investigated. Under the experimental conditions, the extraction of Ce(IV) presented an significant synergistic effect with the mixed extraction systems of Cyanex 923-P204, Cyanex 923-P507 and Cyanex 923-Cyanex 272. On the contrary, the extraction of Th(IV) showed significant antagonistic effects in the mixed systems. The separation factor for Ce(IV)/Th(IV) reached as 36.8 at a mole fraction of 70% Cyanex 923 in the Cyanex 923-P507 system. It is shown that the mixed extraction systems not only enhance the extraction efficiency of Ce(IV) but also improve the selectivity of Ce(IV) over Th(IV). Furthermore, a fractional extraction process (including 4 stages of extraction, 2 stages of scrubbing and 2 stages of stripping) with the mixed Cyanex 923-P507 to separate Ce(IV) from the bastnasite leach solution has been designed. Cerium solution of Ce2(SO4)3 and CeF3 nanoparticle were obtained with 99.8% and 99.9% purity, respectively. © 2013 Elsevier B.V. All rights reserved.

Wang Y.,Ningbo University | Qi M.,Wuhan University of Technology | He H.,China Academy of Engineering Physics | Wang L.,Ningbo University
Mechanics of Materials | Year: 2014

The effects of microstructure on the spall failure were studied for four aluminum materials by a series of plate-impact spall experiments, including the real-time measurements of the free surface velocity profiles and the microscopic postimpact examination of the soft-recovered samples. Spall strength values are calculated by using the free surface velocity measurements. The high density high purity aluminum (Al HP) exhibits a higher spall strength than the low-porosity pure aluminum. The metallographic examination revealed that it could be attributed to the less impurity in the grain boundaries in the Al HP samples, having a better resistance for void nucleation. The 2024-T4 aluminum alloy exhibits a stronger spall failure resistance than the 7075-T6 aluminum alloy, which is associated with the stronger plastic strain hardening behavior. Comparison among the Al HP, 2024-T4 and 7075-T6 alloys indicates that the differences observed in the rise rate of pull-back are linked with the different active mechanism and growth rate of damage evolution. © 2013 Elsevier Ltd. All rights reserved.

Jin L.,University of Swansea | Li L.,University of Swansea | Li L.,Wuhan University of Technology
IEEE Electron Device Letters | Year: 2015

A new sensor device based on the principle of the nanomechanical transistor (NMT) is postulated. The sensor consists of two mechanically coupled resonators, of which one is embedded in the NMT as the active resonator, and the other purely acts as the passive sensor. Numerical analysis on the device has been presented using coupled mechanical and charge transfer equations. The results show that high mass sensitivity can be achieved for such devices. © 2014 IEEE.

Luo Y.,Wuhan University of Technology
Journal of Intelligent Manufacturing | Year: 2015

Job Shop Scheduling Problem (JSSP) is one of classic combinatorial optimization problems and has a long research history. Modern job shop has following characteristics: increasingly complicated processes, small batch and personalized requirement, which lead to complex correlations among processes. Complex correlations of processes, involving nested correlations besides serial and parallel correlations, propose a new task for JSSP research. Decomposing JSSP into two nested sub problems of order of arranging processes and machine arrangement, this research integrates the traditional thought of complex method into the ant colony optimization (ACO) to develop a nested optimization method in order to solve the new task. This paper is divided into four parts: first, the model of JSSP with complex associated processes is constructed and the difficulties to solve which are analyzed and listed; second, the definition of “order of arranging processes” is originally proposed, based on which the mathematical model available for the complex method is developed, taking process starting time as design variables of the first level optimization. The steps of the first level optimization and the secondary nested flow chart are detailed with the demonstration of the effectiveness of the complex method’s iteration mechanism; third, based on the representation of features the order of arranging processes obtained by the first level optimization combined with the first-in first-out rule owns, the corresponding modified ACO algorithm, involving pheromone positive perception and reverse spreading mechanism, is put forward to realize the second level optimization, which result is taken as the objective function value of the complex vertex to realize the secondary nested optimization strategy; finally, taking plentiful JSSP with complex associated processes as study cases, a serial of comparative experiments are done respectively adopting the genetic algorithm, ACO algorithm, particle swarm optimization algorithm, some combinations of heuristic algorithms respectively in the nested two levels, and the proposed nested optimization method, and experiment results attest the reliability and superiority of the proposed method. © 2015 Springer Science+Business Media New York

Wu S.,Central South University | Liu Y.,Central South University | Yu G.,Central South University | Guan J.,Wuhan University of Technology | And 4 more authors.
Macromolecules | Year: 2014

A consolidated ionothermal strategy was developed for the polymerization of thermally unstable nitriles to construct high performance materials with permanent porosity, and carbazole, dibenzofuran, and dibenzothiophene were separately introduced into covalent triazine-based networks to investigate the effects of heterocycles on the gas adsorption performance. Three nitriles, namely 3,6-dicyanocarbazole, 3,6-dicyanodibenzofuran, and 3,6- dicyanodibenzothiophene, were designed and synthesized, which were readily converted to heat-resistant intermediates at a moderate temperature and then polymerized to create highly porous poly(triazine) networks instead of the traditional one-step procedure. This documents an improved strategy for the successful construction of heterocyclic-functional triazine-based materials. The chemical structures of monomers and polymers were confirmed by 1H NMR, FTIR, and elemental analysis. Such polymers with high physical-chemical stability and comparable BET surface areas can uptake 1.44 wt % H2 at 77 K/1 bar and 14.0 wt % CO2 at 273 K/1 bar and present a high selectivity for gas adsorption of CO2 (CO2/N2 ideal selectivity up to 45 at 273K/1.0 bar). The nitrogen- and oxygen-rich characteristics of carbazole and dibenzofuran feature the networks strong affinity for CO2 and thereby high CO2 adsorption capacity. This also helps to thoroughly understand the influence of pore structure and chemical composition on the adsorption properties of small gas molecules. © 2014 American Chemical Society.

Song Y.,Wuhan University of Technology | Hua L.,Hubei University of Automotive Technology
Materials Science and Engineering A | Year: 2012

In the current work, the local constitutive properties of three different laser welded beads were used in finite element (FE) models of tailor welded blanks (TWBs). Based on these FE models, the influence of the weld property inhomogeneity on TWB formability was evaluated by performing Erichsen cupping tests numerically and experimentally. Comparative studies of the predicted crack onsets, punch load-stroke profiles, punch/blank contact areas, plastic strain evolution and major/minor in-plane strain distributions were conducted based on the FE models with and without the incorporation of the inhomogeneous weld properties. The results revealed that with the implementation of inhomogeneous hardening data of weld materials in simulation, more accurate results can be predicted especially for TWBs made from identical base sheets. Moreover, the inhomogeneous properties of weld materials affect the formability of TWBs made from identical base materials more significantly than those made from dissimilar ones. This fact is associated with crack patterns and weld line movements in the TWB forming process. © 2012 Elsevier B.V.

Tang Y.,Yanshan University | Liu Y.,Yanshan University | Yu S.,Yanshan University | Zhao Y.,Yanshan University | And 2 more authors.
Electrochimica Acta | Year: 2014

To construct suitable nanostructures for electronic and ionic transport in the electrode of a supercapacitor, a flower-like nanostructured nickel hydroxide (Ni(OH)2) was synthesized by a facile hydrothermal process in this study. For comparison, an additional two Ni(OH)2 samples were synthesized to investigate the formation mechanism of the flower-like Ni(OH)2. Physicochemical characterizations indicate that the Ni(OH)2 nanoflower was formed by stacked hexagonal β-phase of the Ni(OH)2 nanoflakes. The dissolution-recrystallization of Ni(OH)2 and the stacking of nanoflakes play important roles in the formation of Ni(OH)2 nanoflowers. Due to the higher conductivity and the suitable macropores for ionic transport, the nanoflower-like Ni(OH) 2 exhibits a high specific capacitance of 2653.2 F g-1 at 2 A g-1 and 1998.5 F g-1 at 40 A g-1. An asymmetric supercapacitor, which was assembled with Ni(OH)2 as the positive material and HNO3-treated activated carbon as the negative material, exhibited a high cell voltage of 1.6 V. Due to the high specific capacitance and high cell voltage, the as-prepared asymmetric supercapacitor exhibited a high energy density of 32.7 Wh kg-1 at 71.5 W kg -1 and 25.5 Wh kg-1 at 1.28 kW kg-1. © 2014 Elsevier Ltd.

Chen W.,Key Laboratory for Silicates Materials Science and Engineering | Chen W.,Wuhan University of Technology | Brouwers H.J.H.,TU Eindhoven
Construction and Building Materials | Year: 2012

The use of shrinkage-compensating admixture in concrete has been proven to be an effective way to mitigate the shrinkage of concrete. The hydration of a shrinkage-compensating admixture in cement paste and concrete is investigated in this paper with numerical simulation and experimental study. An ettringite-based mineral shrinkage-compensating admixture (MSA) is developed taking use of industrial by-products. The MSA is designed with special considerations to the stoichiometry of ettringite formation, i.e. it should provide stable sources of sulfate and alumina which are necessary for the ettringite formation. Experimental results prove that the new MSA can successfully compensate the autogenous shrinkage of concrete. © 2011 Elsevier Ltd. All rights reserved.

Zhang L.,Wuhan University of Technology | Huang A.Q.,North Carolina State University
Journal of Power Sources | Year: 2011

Hybrid DC power sources which consist of fuel cells, photovoltaic and lithium-ion batteries provide clean, high efficiency power supply. This hybrid DC power sources can be used in many applications. In this work, a model-based fault detection methodology for this hybrid DC power sources is presented. Firstly, the dynamic models of fuel cells, photovoltaic and lithium-ion batteries are built. The state space model of hybrid DC power sources is obtained by linearizing these dynamic models in operation points. Based on this state space model the fault detection methodology is proposed. Simulation results show that model-based fault detection methodology can find the fault on line, improve the generation time and avoid permanent damage to the equipment. © 2011 Elsevier B.V.

Yang B.,Wuhan University of Technology
Applied Mathematics and Information Sciences | Year: 2014

High-order consensus, in which individual high-order dynamic units keep in pace with each other in a distributed fashion, depends both on the feedback gains of the protocol and on the properties of the interaction network. By employing a frequency domain method, we explicitly derive analytical equations that clarify a rigorous connection between the stability of general high-order consensus and the system parameters such as the network topology and feedback gains. Using the derived consensus polynomials, the general sufficient and necessary stability criterion is obtained for high-order consensus networks of arbitrary topology. Furthermore, a sufficient condition of desirable time complexity for high-order consensus is given by exploiting the topology properties of underlying networks. Numerical simulation results are provided to demonstrate the effectiveness of our theoretical results. © 2014 NSP Natural Sciences Publishing Cor.

Gao Z.,Wuhan University of Technology | Gao Z.,Zhengzhou Coal Industry Group Co.
International Journal of Mining Science and Technology | Year: 2012

It is an emerging realistic problem on how to promote a high level of technology in the coal industry, find new upgrading powers and create new competitive advantages, which are also the core problems to efficient transformation pattern of economic growth for coal industry in the "twelfth five-year" period, involving the key to China's energy supply and energy security. Through field surveys and inductive analyses, analyzing of the content of upgrading the coal industry as an entry point, this paper analyzes the sustainable development mechanisms for the coal industry from the aspects of work force, power, methods, goals, and so on; and puts forward corresponding developmental modes according to the mechanisms which can improve resource recovery and mineral resources utilization rates by putting them into practice. © 2012 Published by Elsevier B.V. on behalf of China University of Mining & Technology.

Yu J.,Wuhan University of Technology | Wang Y.,Beijing University of Posts and Telecommunications | Lei M.,Beijing University of Posts and Telecommunications
ACS Applied Materials and Interfaces | Year: 2013

The reduction of graphene oxide (GO) with a large-scale production has been demonstrated to be one of the key steps for the preparation of graphene-based composite materials with various potential applications. Therefore, it is highly required to develop a facile, green, and environmentally friendly route for the effective reduction of GO. In this study, a new and effective reduced method of GO nanosheets, based on the dye-sensitization-induced visible-light reduction mechanism, was developed to prepare reduced GO (rGO) and graphene-based TiO 2 composite in the absence of any additional reducing agents. It was found that the dye-sensitization-induced reduction process of GO was accompanied with the formation of TiO2-rGO composite nanostructure. The photocatalytic experimental results indicated that the resultant TiO 2-rGO nanocomposites exhibited significantly higher photocatalytic performance than pure TiO2 because of a rapid separation of photogenerated electrons and holes by the rGO cocatalyst. © 2013 American Chemical Society.

Zhou X.,University of Chinese Academy of Sciences | Ge H.,University of Chinese Academy of Sciences | Xia L.,University of Chinese Academy of Sciences | Zhang D.,Wuhan University of Technology | Hu C.,University of Chinese Academy of Sciences
Bioresource Technology | Year: 2013

This study attempted to connect the dots between laboratory research and the outdoors. Chlorella sp. NJ-18 was selected among seven oil-producing algae cultivated in this study because it had the highest lipid productivity. The nitrogen and phosphorus concentrations for cultivating this Chlorella strain were optimized indoors. This strain was incubated outdoors in a 70L photobioreactor, containing the favorable nitrogen (8.32mM urea) and phosphorus (0.18mM monopotassium phosphate) concentrations. Semi-continuous cultivation was performed by harvesting 30L biomass and replacing it with fresh medium. The maximum biomass and lipid productivity acquired outdoors were 91.84 and 24.05mgL-1d-1, respectively. Furthermore, biomass productivity could be maintained at a high level throughout the cultivation process when using the semi-continuous mode, whereas it decreased dramatically in batch cultures. More than 95% of the total fatty acids obtained were C16 and C18, which are the main components for biofuel. © 2013 Elsevier Ltd.

Liu Y.,Central South University | Wu S.,Central South University | Wang G.,Central South University | Yu G.,Central South University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2014

Engineering porosity and surface functionalization in nanoporous organic polymers remain challenging. Here, we achieve control over the porosity as well as the pre-functionalization of pore walls of a carbazole-modified polytriazine framework by the introduction of three different appended functional groups (methyl, ethyl acetate and phenyl). All the synthesized nanoporous organic polytriazines (NOPs) display good thermal stability and high BET surface areas. The phenyl-anchored framework (NOP-21) exhibits the highest CO2 capacity (12.3 wt% at 273 K and 1 bar) and isoteric heat values (Qst, 37 kJ mol-1). Besides, the highest selectivity based on the ideal adsorbed solution theory (IAST) model at 273 K was amazingly observed for the ethyl acetate-appended framework (NOP-20): CO2-N2 81 (273 K, 1.0 bar), because of uniform ultramicropores through pore engineering. These results suggest a good feasibility for constructing high-performance organic porous CO2 sorbents by controlling porosity. This journal is © the Partner Organisations 2014.

Yang Y.,Okinawa Institute of Science and Technology | Yang Y.,Wuhan University of Technology | Saurabh S.,Okinawa Institute of Science and Technology | Ward J.M.,Okinawa Institute of Science and Technology | Chormaic S.N.,Okinawa Institute of Science and Technology
Optics Express | Year: 2016

Sensors based on whispering gallery resonators have minute footprints and can push achievable sensitivities and resolutions to their limits. Here, we use a microbubble resonator, with a wall thickness of 500 nm and an intrinsic Q-factor of 107 in the telecommunications C-band, to investigate aerostatic pressure sensing via stress and strain of the material. The microbubble is made using two counter-propagating CO2 laser beams focused onto a microcapillary. The measured sensitivity is 19 GHz/bar at 1.55m. We show that this can be further improved to 38 GHz/bar when tested at the 780 nm wavelength range. In this case, the resolution for pressure sensing can reach 0.17 mbar with a Q-factor higher than 5×107. © 2016 Optical Society of America.

Meunier C.F.,University of Namur | Dandoy P.,University of Namur | Su B.-L.,University of Namur | Su B.-L.,Wuhan University of Technology
Journal of Colloid and Interface Science | Year: 2010

Living cells can be considered as a highly efficient molecular engines spatially enclosed, remaining however fragile. By combining cells with silica materials in an appropriate way, novel living hybrid material technologies can be designed. After showing the real interplay between silica species and living organisms in nature, this featuring article summarizes the considerable progress in cell encapsulation into silica matrixes. Generally speaking, bioencapsulation allows protecting cells from harsh environment and controlling their surrounding as well as their concentration. This combination produces ultimately a device that can be oriented to drive the desired biochemical reactions. Particularly, this article highlights that functional living matters are very promising in the development of new eco-friendly processes. Compared to conventional chemical process, these hybrid systems would be enabled to use greater and in more efficient way renewable resources (i.e. solar energy) to produce a vast array of chemicals. Additionally, encapsulated cell technology has opened the possibility to design various other kinds of bioactive materials such as cleaning systems, biosensors and artificial organs. Through different examples, including the immobilization of microorganisms, photosynthetic organelles, plant cells and animal cells, the interests and the preparation methods of these living hybrid materials are discussed. © 2009 Elsevier Inc. All rights reserved.

Zarrin H.,University of Waterloo | Higgins D.,University of Waterloo | Jun Y.,University of Waterloo | Jun Y.,Wuhan University of Technology | And 2 more authors.
Journal of Physical Chemistry C | Year: 2011

Functionalized graphene oxide Nafion nanocomposites (F-GO/Nafion) are presented as a potential proton exchange membrane (PEM) replacement for high temperature PEM fuel cell applications. The GO nanosheets were produced from natural graphite flakes by the modified Hummer's method and then functionalized by using 3-mercaptopropyl trimethoxysilane (MPTMS) as the sulfonic acid functional group precursor. F-GO/Nafion composite membranes were fabricated by a simplistic solution casting method. Several physicochemical characterization techniques were applied to provide insight into the specific structure and morphology, functional groups, water uptake, and ionic conductivities of the membranes. Proton conductivity and single cell test results demonstrated significant improvements for F-GO/Nafion membranes (4 times) over recast Nafion at 120 °C with 25% humidity. © 2011 American Chemical Society.

Pan L.,Wuhan University | Liu H.J.,Wuhan University | Tan X.J.,Wuhan University | Lv H.Y.,Wuhan University | And 3 more authors.
Physical Chemistry Chemical Physics | Year: 2012

Using the nonequilibrium Green's function method and nonequilibrium molecular dynamics simulations, we discuss the possibility of using silicene nanoribbons (SiNRs) as high performance thermoelectric materials. It is found that SiNRs are structurally stable if the edge atoms are passivated by hydrogen, and those with armchair edges usually exhibit much better thermoelectric performance than their zigzag counterparts. The room temperature ZT value of armchair SiNRs shows a width-dependent oscillating decay, while it decreases slowly with increasing ribbon width for the zigzag SiNRs. In addition, there is a strong temperature dependence of the thermoelectric performance of these SiNRs. Our theoretical calculations indicate that by optimizing the doping level and applied temperature, the ZT value of SiNRs could be enhanced to as high as 4.9 which suggests their very appealing thermoelectric applications. © 2012 the Owner Societies.

Xu K.,Huazhong University of Science and Technology | Zeng D.,Huazhong University of Science and Technology | Tian S.,Wuhan University of Technology | Zhang S.,Huazhong University of Science and Technology | Xie C.,Huazhong University of Science and Technology
Sensors and Actuators, B: Chemical | Year: 2014

Hierarchical porous (HP) nanostructures of metal oxide have been attracting increasing attention due to its fast response and high sensitivity in sensors application. However, the controllable synthesis of HP structures is rather complex and these fragile structures can be easily destroyed during fabrication process of sensors. To solve this problem, a novel integration of materials synthesis and sensors manufacture was successfully realized by introducing the topological transformation approach (TTF) on basis of a facile, low-cost, conventional process including screen printing and calcination. By employing this method, HP-SnO2 micro-rods assembled by nanoparticles were prepared in situ on the co-planar sensors' surface. The formation mechanism of HP-SnO2 was mainly attributed to a decomposition reaction followed by gas escaping process. As expected, the as-prepared HP-SnO2 sensor exhibited not only fast response (∼4.3 s), which was one-tenth of response time of the gas sensor based on SnO2 nanoparticles, but also high sensitivity (Ra/Rg = 3.86) to formaldehyde at 1 ppm. The excellent gas-sensing properties can be indeed ascribed to the HP structure which was favorable for gas diffusion and sensing reactions. This work renders great potential in the fabrication process of gas sensor with HP structure simply by a TTF method which can be further applied in indoor pollution detection.© 2013 Elsevier B.V. All rights reserved.

Li M.,Wuhan University of Technology | Li Y.,Wuhan Photonics Science and Technology Company
Applied Optics | Year: 2011

The interaction of a large temperature-dependent refractive index and a temperature-dependent absorption of semiconductor materials at 1550 nm can be used to build a very sensitive, film coated fiber-optic temperature probe.We developed a sensor model for the optical fiber-germanium film sensor. A temperature sensitivity of reflectivity change of 0:0012=°C, corresponding to 0:1 °C considering a moderate signal processing system, over 100 °C within the temperature regime of -20 °C to 120 °C, has been demonstrated by experimental tests of the novel sensor. The potential sensitivity and further applications of the sensor are discussed. © 2011 Optical Society of America.

Wang C.,Hubei University of Education | Le Y.,Hubei University of Education | Cheng B.,Wuhan University of Technology
Ceramics International | Year: 2014

Hollow and solid ZrO2 microspheres with mesoporous structures were prepared by a hydrothermal method using zirconium oxychloride and urea as precursors. The as-prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy and nitrogen adsorption-desorption isotherms. Adsorption performance of the as-prepared samples toward Congo red (CR) aqueous solutions was investigated and discussed. The pore structure analyses indicated that the prepared ZrO2 hollow and solid microspheres contained bimodal porous organization: small mesopores (ca. 2 nm) and large mesopores and macropores (ca. 40-70 nm). The CR equilibrium adsorption data of the as-prepared samples were fitted using Langmuir and Freundlich equations, indicating that the Langmuir equation exhibited the better correlation of the experimental data. The CR adsorption capacities were determined by the Langmuir equation and found to be 59.5, 21.4 and 4.8 mg g -1 for the ZrO2 hollow, solid microsphere and reagent samples, respectively. Adsorption data were further modeled by the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetics equations. The results suggested that pseudo-second-order kinetic and intra-particle diffusion equations could better describe the kinetics of CR adsorption. The prepared ZrO2 hollow microsphere was found to be good adsorbent for the CR removal from water due to its high specific surface areas and bimodal porous structures. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Zhang L.,Wuhan University of Technology | Zhang L.,Hubei University of Economics
Applied Mechanics and Materials | Year: 2013

this paper gives a brief account of the 3D printing concept and a comprehensive analysis of the development status, trend and the application prospect of the industry both at home and abroad. It introduces the application development situation of the 3D technology in the field of industrial design at home and abroad, discusses the potential impact of the 3D technology on the manufacturing, and puts forward the proposal for how the industrial design industry in our country should deal with the industrial revolution brought about by the 3D printing industry. © (2013) Trans Tech Publications, Switzerland.

Winter S.,University of Melbourne | Yin Z.-C.,University of Melbourne | Yin Z.-C.,Wuhan University of Technology
GeoInformatica | Year: 2011

Time geography uses space-time volumes to represent the possible locations of a mobile agent over time in a x-y-t space. A volume is a qualitative representation of the fact that the agent is at a particular time ti inside of the volume's base at ti. Space-time volumes enable qualitative analysis such as potential encounters between agents. In this paper the qualitative statements of time geography will be quantified. For this purpose an agent's possible locations are modeled from a stochastic perspective. It is shown that probability is not equally distributed in a space-time volume, i. e., a quantitative analysis cannot be based simply on proportions of intersections. The actual probability distribution depends on the degree of a priori knowledge about the agent's behavior. This paper starts with the standard assumption of time geography (no further knowledge), and develops the appropriate probability distribution by three equivalent approaches. With such a model any analysis of the location of an agent, or relations between the locations of two agents, can be improved in expressiveness as well as accuracy. © 2010 Springer Science+Business Media, LLC.

Lemaire A.,University of Namur | Rooke J.C.,University of Namur | Chen L.-H.,University of Namur | Su B.-L.,University of Namur | Su B.-L.,Wuhan University of Technology
Langmuir | Year: 2011

Hierarchically structured spongy meso-macroporous aluminosilicates with high tetrahedral aluminum content were synthesized from a mixture of single molecular alkoxide precursor, (sec-BuO)2-Al-O-Si(OEt)3, already containing Si-O-Al bonds, and a silica coreactant, tetramethoxysilane (TMOS). The spontaneous byproduct templated macroporous structure formation has been directly visualized using in situ high-resolution optical microscopy (OM), allowing the crucial observation of a microbubble dispersion which is directly correlated to the macrostructure observed by electronic microscopies (SEM and TEM). This discovery leads to a comparative study with meso-macroporous pure metal oxide and to a proposal of the formation mechanism of meso-macroporous aluminosilicates with 3D interconnectivity. The aluminosilicate phase/microbubbles emulsion is produced by a phase separation process occurring between the aluminosilicate nanoparticles and the liquid hydrolysis-condensation reaction byproducts (water, methanol, ethanol, and butanol). The use of alkoxysilane improves the heterocondensation rates between the highly reactive aluminum alkoxide part of the single precursor and added silica species but, above all, leads to the spontaneous generation of an unusual meso-macroporosity in alkaline media. The particles obtained at pH = 13.0 featured regular micrometer-sized macrospheres separated by very thin mesoporous walls and connected by submicrometric openings, providing a 3D interconnectivity. The slight increase in pH value to 13.5 induced significant modifications in morphology and textural properties due to the slower gelification process of the aluminosilicate phase, resulting in the formation of an aluminosilicate material constituted of 1-2 μm large independent hollow mesoporous spheres. © 2011 American Chemical Society.

Jun Y.,University of Waterloo | Jun Y.,Wuhan University of Technology | Zarrin H.,University of Waterloo | Fowler M.,University of Waterloo | Chen Z.,University of Waterloo
International Journal of Hydrogen Energy | Year: 2011

In this study, functionalized titania nanotubes (F-TiO2-NT) were synthesized by using 3-mercaptopropyl-tri-methoxysilane (MPTMS) as a sulfonic acid functionalization agent. These F-TiO2-NT were investigated for potential application in high temperature hydrogen polymer electrolyte membrane fuel cells (PEMFCs), specifically as an additive to the proton exchange membrane. Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) results confirmed that the sulfonic acid groups were successfully grafted onto the titania nanotubes (TiO2-NT). F-TiO2-NT showed a much higher conductivity than non-functionalized titania nanotubes. At 80 °C, the conductivity of F-TiO2-NT was 0.08 S/cm, superior to that of 0.0011 S/cm for the non-functionalized TiO 2-NT. The F-TiO2-NT/Nafion composite membrane shows good proton conductivity at high temperature and low humidity, where at 120 °C and 30% relative humidity, the proton conductivity of the composite membrane is 0.067 S/cm, a great improvement over 0.012 S/cm for a recast Nafion membrane. Based on the results of this study, F-TiO2-NT has great potential for membrane applications in high temperature PEMFCs. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.

Lei D.,Wuhan University of Technology
Applied Soft Computing Journal | Year: 2011

Job shop scheduling with multi-objective has been extensively investigated; however, multi-objective stochastic job shop scheduling problem is seldom considered. In this paper, a simplified multi-objective genetic algorithm (SMGA) is proposed for the problem with exponential processing time. The objective is to minimize makespan and total tardiness ratio simultaneously. In SMGA, the chromosome of the problem is ordered operations list, an effective schedule building procedure is proposed, a novel crossover is used, and a simplified binary tournament selection and a simple external archive updating strategy are adopted. SMGA is finally tested on some benchmark problems and compared with some methods from literature. Computational results demonstrate that the good performance of SMGA on the problem. © 2011 Elsevier B.V. All rights reserved.

Fan X.,Wuhan University of Technology | Zhang M.,University College London
Composites Part B: Engineering | Year: 2016

Corrosion of reinforcing steel and the severe degradation of mechanical properties with temperature and fire conditions are the weakest points of steel-reinforced concrete structures and fibre reinforced polymer (FRP) system, respectively. In this paper, the basalt reinforced inorganic polymer concrete (IPC) beam which combines the specific characteristics of IPC and basalt reinforcement such as good corrosion resistance and fire resistance was proposed. The inorganic polymer binder was made of fly ash, ground granulated blast-furnace slag and alkaline activating solution. The mechanical properties of IPC were measured and compared with those of reference ordinary Portland cement (OPC) concrete. The flexural behaviour of basalt reinforced IPC beam was investigated and compared to control steel-reinforced OPC concrete beam. The measured ultimate flexural capacity of basalt reinforced IPC beam was compared with the predicted value obtained using the guidelines for FRP-reinforced OPC concrete beam. Results indicated that the elastic modulus of IPC was very close to OPC, while the compressive strength and flexural strength of IPC were around 80% of those of OPC. The IPC beam reinforced with basalt rebar exhibited a two-stage load-midspan deflection response that was different from control concrete beam due to the different mechanical properties of basalt and steel rebars. The crack patterns in basalt reinforced IPC beam were found to be similar to control beam, however, the maximum crack width of basalt reinforced beam was approximately 2 times that of control beam. The guidelines for FRP-reinforced concrete beam were adequate for predicting the flexural strength of basalt reinforced IPC beams. © 2016 Elsevier Ltd. All rights reserved.

Guo B.,Wuhan University of Technology | Qiu X.-M.,Southwestern Institute of Physics
Journal of Electromagnetic Waves and Applications | Year: 2011

In the present paper, we first show that the plasma injected into the interaction region forms a periodical distribution of the plasma density that is called self-induced density grating and exerts a periodic perturbation on the dielectric constant under two strong counterpropagating waves modulation. In succession, we demonstrate that the self-induced quasi periodic plasma density grating formed by the self-induced distributed feedback possesses the properties of plasma photonic crystal (PPC). Therefore, the formation of PPC by the self-induced quasi periodic plasma density grating is a feasible fabrication scenario for PPC. Based on an equivalent model of the plasma density grating, a dispersion relation is derived, and a simple case is calculated and discussed. © 2011 VSP.

Zhang X.,Anhui University of Science and Technology | Zhang J.,Anhui University of Science and Technology | Zhao J.,Anhui University of Science and Technology | Pan B.,Anhui University of Science and Technology | And 3 more authors.
Journal of the American Chemical Society | Year: 2012

Controlling the synthesis of atomic-thick nanosheets of nonlayered materials is extremely challenging because of the lack of an intrinsic driving force for anisotropic growth of two-dimensional (2D) structures. In that case, control of the anisotropy such as oriented attachment of small building blocks during the reaction process will be an effective way to achieve 2D nanosheets. Those atomic-thick nanosheets possess novel electronic structures and physical properties compared with the corresponding bulk samples. Here we report Co 9Se 8 single-crystalline nanosheets with atomic thickness and unique lamellar stacking formed by 2D oriented attachment. The atomic-thick Co 9Se 8 nanosheets were found to exhibit intrinsic half-metallic ferromagnetism, as supported by both our experimental measurements and theoretical calculations. This work will not only open a new door in the search for new half-metallic ferromagnetic systems but also pave a practical way to design ultrathin, transparent, and flexible paperlike spintronic devices. © 2012 American Chemical Society.

Chen W.,Wuhan University of Technology | Brouwers H.J.H.,TU Eindhoven
Journal of Materials Science | Year: 2011

The alkalinity of the pore liquid in hardened cement paste or concrete is important for the long-term evaluation of alkali-silica reaction (ASR) expansion and corrosion prevention of steel bar in steel reinforced structures among others. It influences the reactivity of supplementary cementitious materials as well. This paper focuses on the alkali binding in hydrated slag cement paste and a method for predicting the alkali concentrations in the pore solution is developed. The hydration of slag cement is simulated with a computer-based model CEMHYD3D. The amount of alkalis released by the cement hydration, quantities of hydration products, and volume of the pore solution are calculated from the model outputs. A large set of experimental results reported in different literatures are used to derive the alkali-binding capacities of the hydration products and practical models are proposed based on the computation results. It was found that the hydrotalcite-like phase is a major binder of alkalis in hydrated slag cement paste, and the C-S-H has weaker alkali-binding capacity than the C-S-H in hydrated Portland cement paste. The method for predicting the alkali concentrations in the pore solution of hydrated slag cement paste is used to investigate the effects of different factors on the alkalinity of pore solution in hydrated slag cement paste. © 2011 The Author(s).

Tong G.,Zhejiang Normal University | Du F.,Zhejiang Normal University | Xiang L.,Zhejiang Normal University | Liu F.,Zhejiang Normal University | And 2 more authors.
Nanoscale | Year: 2014

This paper describes a green versatile glucose-engineered precipitation-sintering process that allows for the selective and mass preparation of spongy porous ferrite (M = Fe, Zn, Co, Ni, Mn, etc.) micro-polyhedra with tunable morphology, texture, and composition. Some kinetic factors, such as the molar ratio of glucose to metal nitrates, reaction temperature, sintering temperature and time, and type of metal nitrates, can be expediently employed to modulate their aspect ratio, shape, size, composition, and textural properties. In this protocol, glucose functions as a reductant, protecting agent, structure-directing agent, and a sacrificial template to guide the assembly of sheet-like nuclei into polyhedral precursors and the formation of spongy porous structures. Owing to larger EM parameters, multiresonant behavior, and dissipative current, spongy porous Fe3O4 polyhedra exhibited enhanced microwave-absorbing properties. This endows them with important potential applications in magnetic devices, catalysis, sorption, photoluminescence, electromagnetic wave absorbing materials, anode materials, and so on. Meanwhile, this general approach can be extended to synthesize other porous sponges with regular geometric configuration because it is simple, inexpensive, environmentally benign, and suitable for extensive production. © 2013 The Royal Society of Chemistry.

Chen S.,Tongji University | Cai K.,Tongji University | Zhao W.,Wuhan University of Technology
Physica B: Condensed Matter | Year: 2012

SnSe 1-xTe x (x=0, 0.0625) bulk materials were fabricated by melting Sn, Se and Te powders and then hot pressing them at various temperatures. The phase compositions of the materials were determined by X-ray diffraction (XRD) and the crystal lattice parameters were refined by the Rietveld method performed with DBWS. XRD analysis revealed that the grains in the materials preferentially grew along the (l 0 0) directions. The structural behavior of SnSe 1-xTe x (x=0, 0.0625) was calculated using CASTEP package provided by Materials Studio. We found that the band gap of SnSe reduced from 0.643 to 0.608 eV after Te doping. The calculated results were in good agreement with experimental results. The electrical conductivity and the Seebeck coefficient of the as-prepared materials were measured from room temperature to 673 K. The maximum power factor of SnSe is ∼0.7 μW cm -1K -2 at 673 K. © 2012 Elsevier B.V.

Fan Q.,Wuhan University of Technology
Physica A: Statistical Mechanics and its Applications | Year: 2016

In this paper, we develop a new method called asymmetric multiscale detrended fluctuation analysis, which is an extension of asymmetric detrended fluctuation analysis (A-DFA) and can assess the asymmetry correlation properties of series with a variable scale range. We investigate the asymmetric correlations in California 1999-2000 power market after filtering some periodic trends by empirical mode decomposition (EMD). Our findings show the coexistence of symmetric and asymmetric correlations in the price series of 1999 and strong asymmetric correlations in 2000. What is more, we detect subtle correlation properties of the upward and downward price series for most larger scale intervals in 2000. Meanwhile, the fluctuations of Δα(s) (asymmetry) and |Δα(s)| (absolute asymmetry) are more significant in 2000 than that in 1999 for larger scale intervals, and they have similar characteristics for smaller scale intervals. We conclude that the strong asymmetry property and different correlation properties of upward and downward price series for larger scale intervals in 2000 have important implications on the collapse of California power market, and our findings shed a new light on the underlying mechanisms of power price. © 2015 Elsevier B.V. All rights reserved.

Jiankun O.,Wuhan University of Technology
Journal of Networks | Year: 2013

Data Processing is an important issue in wireless sensor networks (WSNs). However, constrained energy will lead to the network life deeply affected by the power consumption of data processing. Hence, reducing the power consumption becomes an important objective to improve the performance of WSNs. In this paper, an energy-efficient data processing scheme (EED) is proposed to reach the goal of saving energy, which embeds the active energy saving approach of tuning data transmission power into the fairness queuing algorithm. Hence, in the proposed EED, the energy saving scheme in the system can find out the data deliver sequence with the minimum power consumption. Detailed simulation results show that, compared with existed schemes, the proposed EED can reduce the power consumption of transmission with consideration of the packet deliver sequence, which also improve the performance in terms of network lifetime, power consumption, fairness and throughput. © 2013 ACADEMY PUBLISHER.

Li S.,Wuhan University of Technology
2010 International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2010 | Year: 2010

Cable force testing techniques which based on fiber Bragg grating (FBG), namely, FRP smart tendon, FBG vibration sensor and FBG force-testing ring, etc, have been widely used in bridge cable long-term safety monitoring. Except for FRP smart tendon, the other two FBG-based cable force sensors have already possessed some mature engineering application examples. In view of the installation manner of force-testing ring which should be installed between anchor slab and anchor nut, the testing accuracy of FBG force-testing ring which doesn't need to carry out spectral analysis is higher than the FBG vibration sensor. Due to the simple design thought that along the axial stress direction of elastic body to layout FBG, existing FBG force-testing rings usually need additional FBG to achieve sensor temperature compensation. However, differential FBG force-testing ring can eliminate the temperature influence in testing. The good linear relationship between sensor wavelength and load verified the rationality of differential structural design. The practicability and accuracy in actual engineering of differential FBG force-testing ring were revealed by a certain bridge cable force comparison testing results. © 2010 IEEE.

Li H.,Wuhan University of Technology
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2015

The commonly used two methods of slope stability evaluation are interpreted. Using finite element strength reduction method, the high slope stability which is excavated stepwise is analyzed. It is found that the safety factors increase after it is excavated stepwise. The first four class platforms after excavation show that the safety factors increase slowly by 0.02 at most, but after the last class platform is excavated, the safety factors increase sharply by 0.04. Also, the slip zone's position basically remains unchanged after the first four class platforms'excavation, while the slip zone's position changes obviously after the last two class platforms' excavation. Finally, the safety factors calculated by GEO-SLOPE is similar to that calculated by the finite element strength reduction method. The results show the application of the finite element strength reduction method is reasonable. ©, 2015, Nanjing University of Science and Technology. All right reserved.

Li C.R.,Wuhan University of Technology | Sarker B.R.,Louisiana State University
International Journal of Advanced Manufacturing Technology | Year: 2013

The traditional system for estimating lifespan of machining tools is based on the F. W. Taylor's equation that uses fixed cutting factors. In this paper, an integrated model is proposed to get a better prediction of tool lifespan in machining process. The lifespan prediction of cutting tools having multiple affecting factors is studied here for machining parts with stochastic behavior of Taylor's measuring parameter, k. The measuring variable k used to be regarded normally as a constant under predetermined conditions. In practice, lifespan of a tool lies in the range of a time interval rather than a fixed value. So, by calculating the impact of the stochastic variable k, a relative precise range of tool lifespan can be computed and this is particularly important for high-value-added products in manufacturing process because high-value-added products are usually extremely sensitive to the performance quality and failure cost of cutting tools, resulting in economic loss of the company both in terms of tool cost and product cost. A multiple linear regression approach is employed here to estimate the range of tool lifespan for the predictive model. A case study is conducted to show how this model works. The results of the improved manipulation of the parameters could influence the manufacturing system with a better control accuracy. To illustrate the significance of the transformed model, a case study was introduced that shows how the stochastic variable k influences the lifespan of a cutting tool. Relatively precise numerical results can be computed with this kind of analysis to direct a better comprehension of the factors for the cutting tools. © 2013 Springer-Verlag London.

Zhang H.,Wuhan University of Technology | Darvell B.W.,Kuwait University
Dental Materials | Year: 2012

Objective: To evaluate the reinforcement efficacy of hydroxyapatite (HA) whiskers in bis-GMA-based dental restorative composites and determine the effect of volume fraction on the mechanical properties. Methods: Silanized HA whiskers and nano-scale powder were mixed in various proportions with bis-phenol A-glycidyl methacrylate (bis-GMA)-based polymer pastes. Equal parts of initiator and accelerator pastes were then mixed by hand. After curing at 25 ± 2°C and storage in distilled water at 37°C for 24 h, elastic modulus, fracture strength and work-to-failure in three-point bending, fracture toughness using a notchless triangular prism fracture method, and Vickers hardness were determined. Data were examined by means of one-way analysis of variance and linear regression. Results: Reinforcing efficacy was significantly dependent on filler morphology. Whiskers had good dispersibility and wettability with bis-GMA-based polymer, conferring good reinforcement and toughening, significantly better than did the HA nano-scale powder. Significance: HA whiskers provided better mechanical properties in bis-GMA-based composites compared with the nano-scale powder. Such whisker-reinforced materials may be beneficial compared with currently used dental restorative materials. © 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

Zhang K.,Southwest University of Science and Technology | Fu Z.,Wuhan University of Technology
Intermetallics | Year: 2012

CoCrFeNiTiAl x (x: molar ratio) multi-component alloys were prepared by vacuum arc-melt casting and the as-cast alloys were subsequently heat treated at 1000 °C for 2 h. Effects of Al content and annealing treatment on the mechanical, electrical and magnetic properties were investigated. The addition of Al exhibits significant influence on mechanical properties of the as-cast and the as-annealed alloys, which is actually induced by the evolution of phase composition. The prepared alloys demonstrate good resistance against anneal-softening, as most of the as-annealed alloys show even higher hardness than the as-cast ones. As-annealed Al 0 possesses excellent mechanical property with high compressive strength of 2.46 GPa and strain rate of 12.7%. Strengthening mechanism is revalued in this study as phase composition is considered as a critical factor. The as-cast and the as-annealed CoCrFeNiTiAl x alloys exhibit high electrical resistivity and novel magnetic properties as well. © 2012 Elsevier Ltd. All rights reserved.

Duan Y.,Wuhan University of Technology
2nd International Workshop on Education Technology and Computer Science, ETCS 2010 | Year: 2010

The division of students into liberal arts and science results in their different ways of thinking and cognition, which is followed by their different understanding and perceptions about the sense and artistry design. The two elements should stand hand in hand in harmony, neither the misguidance of absolute sense, nor artistry under the cover of forms. And then today's design majors: the designers-to-be in to future can establish the framework of their knowledge. © 2010 IEEE.

Liu B.,Key Laboratory of Silicate Materials Science and Engineering | Liu B.,Wuhan University of Technology | Zhao X.,Key Laboratory of Silicate Materials Science and Engineering
Electrochimica Acta | Year: 2010

A model based on spherical TiO2 nanoparticles was developed to study heterogeneous photocatalysis based on TiO2 in the case of indirect interfacial charge transfer. In this model, the effect of light intensity (I0), grain size (r0), carrier lifetime (τp), and minority carrier diffusion coefficient (Dp) on the quantum yield (QY) of photocatalytic reactions was investigated in detail. Under conditions of sufficiently low incident-light intensity, the QY was found to be ∝I0, while it decreased rapidly with an increase in I0. In addition, the QY went to zero at a critically high light intensity. Furthermore, the QY was found to decrease with increasing r0 due to the bulk-recombination loss, and the effect of r0 on the QY became increasingly stronger with the increase in I0. The QY decreased with the decrease in τp and Dp, which was more apparent at the critically high I0. Under conditions of low [(RH2)aq], the QY increased with an increase in [(RH2)aq], while it remained nearly constant at high [(RH2)aq] due to the fact that the photoinduced electron interfacial transfer became the limiting step for photocatalytic reactions in the case of high [(RH2)aq]. © 2010 Elsevier Ltd. All rights reserved.

Leonard A.,University of Namur | Dandoy P.,University of Namur | Danloy E.,University of Namur | Leroux G.,University of Namur | And 4 more authors.
Chemical Society Reviews | Year: 2011

This critical review highlights the advances that have been made over recent years in the domain of whole-cell immobilisation and encapsulation for applications relating to the environment and human health, particularly focusing on examples of photosynthetic plant cells, bacteria and algae as well as animal cells. Evidence that encapsulated photosynthetic cells remain active in terms of CO2 sequestration and biotransformation (solar driven conversion of CO2 into biofuels, drugs, fine chemicals etc.), coupled with the most recent advances made in the field of cell therapy, reveals the need to develop novel devices based on the preservation of living cells within abiotic porous frameworks. This review shall corroborate this statement by selecting precise examples that unambiguously demonstrate the necessity and the benefits of such smart materials. As will be described, the handling and exploitation of photosynthetic cells are enhanced by entrapment or encapsulation since the cells are physically separated from the liquid medium, thereby facilitating the recovery of the metabolites produced. In the case of animal cells, their encapsulation within a matrix is essential in order to create a physical barrier that can protect the cells auto-immune defenders upon implantation into a living body. For these two research axes, the key parameters that have to be kept in mind when designing hybrid materials will be identified, concentrating on essential aspects such as biocompatibility, mechanical strength and controlled porosity (264 references). © 2011 The Royal Society of Chemistry.

Hu Z.-Y.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2015

The surface modification of the tourmaline powder with triethoxyvinylsilane was studied to prepare the polymerizable organic tourmaline. The experimental results showed that the surface of modified tourmaline had the better hydrophobicity compared with unmodified tourmaline, when the mass ratio of triethoxyvinylsilane to tourmaline powder was 1∶5, and reacted at 60℃ for 1.5 h in the mixed-solvent of ethanol and distilled water (1∶5 in volume ratio). The structure characterization results indicated that the vinylsiloxane was introduced into the surface of tourmaline powder to generate the polymerizable organic tourmaline, and the crystal structure of tourmaline had no change. ©, 2015, Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology. All right reserved.

Lei D.,Wuhan University of Technology
International Journal of Advanced Manufacturing Technology | Year: 2013

In scheduling problem with uncertainty, flexible preventive maintenance (PM) and multiple objectives are seldom investigated. In this study, interval job shop scheduling problem with non-resumable jobs and flexible maintenance is considered and an effective multi-objective artificial bee colony (MOABC) is proposed, in which an effective decoding procedure is used to build the schedule and handle PM operation. The objective is to minimize interval makespan and a newly defined objective called total interval tardiness. In each cycle, a dominance-based greedy principle is adopted, a dominance-based tournament is utilized to choose solution for onlooker bee, and the non-dominated ranking is applied to update the non-dominated set. A solution with the highest rank is replaced with a non-dominated solution every certain cycle. Computational results show the good performance of MOABC on the considered problem. © 2012 Springer-Verlag London Limited.

Li B.,Fujian University of Technology | Li W.-F.,Wuhan University of Technology
Proceedings - Winter Simulation Conference | Year: 2010

As the highly complex logistics system, container terminal logistics systems (CTLS) play an increasingly important role in modern international logistics, and therefore their scheduling and decision-making process of much significance to the operation and competitiveness of harbors. In this paper, the handling, stacking and transportation in CTLS are regarded as a kind of generalized computing and compared with the working in general computer systems, whereupon the Harvard architecture and agent-based computing paradigm are fused to model the operational processing of CTLS, and the kernel thoughts in computer organization, architecture and operating system are introduced into CTLS to support and evaluate container terminal planning, scheduling and decision-making. A new agile, efficient and robust compound modeling and scheduling methodology for CTLS is obtained consequently. Finally a series of singlevessel simulations on handling and transportation are designed, implemented, performed, evaluated and analyzed, which validate the feasibility and creditability of the systematic methodology effectively. ©2010 IEEE.

Liu P.,University of Ottawa | Liu P.,Wuhan University of Technology | Raahemi B.,University of Ottawa | Benyoucef M.,University of Ottawa
Knowledge-Based Systems | Year: 2011

The success of a virtual enterprise depends largely on the effective collaboration of its members in orchestrating their knowledge, skills, core competences and resources, in order to enhance competitive capabilities and respond better to business opportunities. In this paper we address the challenges of knowledge sharing in dynamic virtual enterprises. We take a socio-technological approach by proposing a human-centered knowledge sharing solution and architecture. Specifically, we propose a knowledge resource space model to represent heterogeneous knowledge resources, both explicit and implicit. We then introduce a knowledge sharing community model and adopt an agent based solution to perform the functions of knowledge sharing among members of a dynamic virtual enterprise. Our solution incorporates the concepts of agent society and semantic ontology. Knowledge sharing in dynamic virtual enterprises is performed with three types of ties: knowledge agent to knowledge agent, knowledge agent to knowledge item, and knowledge item to knowledge item. We measure agent-to-agent ties by preference correlation using the contribution degree of one agent to another and the preference similarity degree between two agents. We define a semantic view to show agent-to-item ties and use semantic links in the knowledge resource space model to reflect item-to-item ties. We also elaborate the co-evolution mechanism of collective intelligence across enterprises throughout the lifecycle of a dynamic virtual enterprise. A case study is presented to validate our approach. © 2010 Elsevier B.V. All rights reserved.

Chen W.-M.,Huazhong University of Science and Technology | Chen W.-M.,Wuhan University of Technology | Qie L.,Huazhong University of Science and Technology | Shao Q.-G.,Huazhong University of Science and Technology | And 3 more authors.
ACS Applied Materials and Interfaces | Year: 2012

Three types of MnO 2 nanostructures, viz., α-MnO 2 nanotubes, hollow β-MnO 2 bipyramids, and solid β-MnO 2 bipyramids, have been synthesized via a simple template-free hydrothermal method. Cyclic voltammetry and galvanostatic charge/discharge measurements demonstrate that the hollow β-MnO 2 bipyramids exhibit the highest specific capacity and the best cyclability; the capacity retains 213 mAh g -1 at a current density of 100 mA g -1 after 150 cycles. XRD patterns of the lithiated β-MnO 2 electrodes clearly show the expansion of lattice volume caused by lithiation, but the structure keeps stable during lithium insertion/extraction process. We suggest that the excellent performance for β-MnO 2 can be attributed to its unique electrochemical reaction, compact tunnel-structure and hollow architecture. The hollow architecture can accommodate the volume change during charge/discharge process and improve effective diffusion paths for both lithium ions and electrons. © 2012 American Chemical Society.

Lei D.,Wuhan University of Technology
Applied Soft Computing Journal | Year: 2012

Fuzzy flexible job shop scheduling problem (FfJSP) is the combination of fuzzy scheduling and flexible scheduling in job shop environment, which is seldom investigated for its high complexity. We developed an effective co-evolutionary genetic algorithm (CGA) for the minimization of fuzzy makespan. In CGA, the chromosome of a novel representation consists of ordered operation list and machine assignment string, a new crossover operator and a modified tournament selection are proposed, and the population of job sequencing and the population of machine assignment independently evolve and cooperate for converging to the best solutions of the problem. CGA is finally applied and compared with other algorithms. Computational results show that CGA outperforms those algorithms compared. © 2012 Elsevier B.V.

Wang X.-L.,Wuhan University of Technology | Wang W.-B.,Wuhan University of Science and Technology
Chinese Physics B | Year: 2015

For the harmonic signal extraction from chaotic interference, a harmonic signal extraction method is proposed based on synchrosqueezed wavelet transform (SWT). First, the mixed signal of chaotic signal, harmonic signal, and noise is decomposed into a series of intrinsic mode-type functions by synchrosqueezed wavelet transform (SWT) then the instantaneous frequency of intrinsic mode-type functions is analyzed by using of Hilbert transform, and the harmonic extraction is realized. In experiments of harmonic signal extraction, the Duffing and Lorenz chaotic signals are selected as interference signal, and the mixed signal of chaotic signal and harmonic signal is added by Gauss white noises of different intensities. The experimental results show that when the white noise intensity is in a certain range, the extracting harmonic signals measured by the proposed SWT method have higher precision, the harmonic signal extraction effect is obviously superior to the classical empirical mode decomposition method. © 2015 Chinese Physical Society and IOP Publishing Ltd.

Bin G.,Wuhan University of Technology | Xiao-Ming Q.,Southwestern Institute of Physics
Optik | Year: 2012

An approach of analytical calculation for photonic band gap structure (PBGS) of one-dimensional periodic media, such as non-uniform distribution plasma photonic crystal (PPC), is given on the basis of the recently reported differential transfer matrix method. The dispersion equation of electromagnetic wave propagating in one dimensional non-uniform distribution PPC is derived and the PBGSs for several numerical cases, such as linear distribution, exponential distribution and Epstein distribution, are calculated and discussed. © 2011 Elsevier GmbH. All rights reserved.

Tong G.,Zhejiang Normal University | Liu Y.,Zhejiang Normal University | Cui T.,Zhejiang Normal University | Li Y.,Zhejiang Normal University | And 2 more authors.
Applied Physics Letters | Year: 2016

Elliptical Fe3O4 nanorings (NRs) with continuously tunable axes that range from 40 nm to 145 nm in length were prepared through a precursor-directed synthetic route to determine the electromagnetic responses generated at 2-18 GHz. The tunability of the dielectric properties of Fe3O4 NRs depends on the long axis rather than on the specific surface area, internal stress, and grain size. Elliptical Fe3O4 NRs exhibit the excellent microwave absorbing properties due to the unique ring-like configuration, which significantly enhances permittivity, multiple scattering, oscillation resonance absorption, microantenna radiation, and interference. These findings indicate that ring-like nanostructures are promising for devising effective microwave absorbers. © 2016 AIP Publishing LLC.

Liu J.,Wuhan University of Technology | Liu J.,Huaibei Normal University
Journal of Physical Chemistry C | Year: 2015

Graphite-like carbon nitride (g-C3N4)-based heterostructures have attracted much attention because of their prominent photocatalytic performance. However, theoretical understanding on the relationship of the interface and enhanced photocatalytic activity is still lacking. In this study, we systematically calculated energy band structure and charge transfer of the g-C3N4/CdS heterojunction using the hybrid density functional approach. The interaction between g-C3N4 and the CdS (110) surface was explored. Results indicated that g-C3N4 and CdS were in contact and formed a van der Waals heterojunction. The valence and conduction band edge positions of g-C3N4 and CdS changed with the Fermi level and formed a standard type-II heterostructure. Furthermore, density of states, Bader charge, and charge density difference indicated that the internal electric field facilitated the separation of electron-hole pair in the g-C3N4/CdS interface and restrained carrier recombination. These results demonstrated that the band structure of the g-C3N4/CdS heterojunction had significant advantages to improve photocatalytic efficiency under visible-light irradiation. Moreover, our work may be used as a basis for the design of other highly active heterostructures. © 2015 American Chemical Society.

Hu B.,Huazhong University of Science and Technology | Chen W.,Wuhan University of Technology | Zhou J.,Huazhong University of Science and Technology
Sensors and Actuators, B: Chemical | Year: 2013

In recent years, the rapid development of flexible electronic devices indicates their attractive perspective in various applications where flexibility, space savings, or production constraints limit the serviceability of rigid circuit boards or hand wiring. While sensors, as the important components in such multifunctional devices, also required to be flexible and robust for integration. In addition, with the emergency of smart sensor networks, low cost, low energy consumption and easy-fabrication sensors with various functions are demanded urgently. Compared with the flexible organic electronic sensors, inorganic nanomaterials based sensors with long life-time and the high carrier mobility have been attracting the interest of researchers, and the tremendous progress has been made for developing the flexible, high-performance inorganic materials based sensors. In this article, we review the recent advancements of some important inorganic materials in various sensing applications, including carbon material and some transition metal oxides. © 2012 Elsevier B.V. All rights reserved.

Cheng E.J.,Tohoku University | Katsui H.,Tohoku University | Tu R.,Wuhan University of Technology | Goto T.,Tohoku University
Journal of the European Ceramic Society | Year: 2014

TiB2-TiCxN1-x composites were synthesized by arc-melting mixtures of TiB2, TiC and TiN powders in a N2 atmosphere at 60kPa. TiB2-TiCxN1-x composites were obtained at TiN contents below 20mol%, whereas TiB formed in the composites at higher TiN contents. TiB2-TiCxN1-x composites with a nominal composition of 36TiB2-44TiC-20TiN (mol%) had a rod-like eutectic structure, where the TiCxN1-x single-crystal rods dispersed in the TiB2 single-crystal matrix. The crystal orientation relationship between the TiB2 matrix and the TiCxN1-x rods was TiB2 (0001)//TiCxN1-x (111). Vickers hardness (Hv) of the rod-like eutectic composite was 22.5GPa. © 2014 Elsevier Ltd.

Aihua L.,Wuhan University of Technology
ICIME 2010 - 2010 2nd IEEE International Conference on Information Management and Engineering | Year: 2010

Condition-based maintenance (CBM) is an optimal maintenance strategy due to improved planning for rehabilitation or replacement based on current evaluation of condition. In this paper, a new method of information fusion-DSmT(Dezert- Smarandache Theory) developed from DST(Dempster-Shafer Theory) and Bayesian theory is introduced to dealing with condition evaluation. With the research and analysis of condition evaluation, the model of condition evaluation based on DSmT is presented in which the generalized basic belief assignment and the rule of information fusion are built. The performance is compared with DSmT and DST for challenging realistic condition evaluation. The result shows that the DSmT enhance the performance of condition evaluation by reducing the time on computing and increasing the quality of fusion result. © 2010 IEEE.

Lei D.,Wuhan University of Technology | Guo X.,Chengdu University of Technology
International Journal of Production Economics | Year: 2015

Abstract We consider the order acceptance and scheduling problem in a flow shop where the objective is to simultaneously minimize makespan and maximize total net revenue. We formulate the problem as a mixed integer linear programming model and develop an effective parallel neighborhood search algorithm. Two-string representation and three neighborhood structures are applied to generate new solutions. Parallelization is implemented by applying two independent searches and directly exchanging information between them. We assess the performance of the proposed method via computational experiments using an extensive set of instances. The experimental results show that the proposed method is highly effective and competitive when compared to other algorithms. © 2015 Elsevier B.V.

Lei D.,Wuhan University of Technology | Guo X.,Southwest Jiaotong University
International Journal of Production Economics | Year: 2015

In this study, scheduling problem in dual-resource constrained (DRC) job shop with interval processing time and heterogeneous resources is investigated. A lexicographical method is applied to minimize interval carbon footprint and makespan. A dynamical neighborhood search (DNS) is proposed, which is composed of two phases. Two-string representation is used and its chromosome consists of the operation-based string and the resource string. Several initial solutions are produced and improved in the first phase and only one solution is applied in the second phase. Four neighborhood structures and their dynamical transition mechanism are utilized to produce new solutions. DNS is tested on a number of instances and compared with other algorithms. Computational experiments show DNS can provide the promising results for the problem. © 2014 Elsevier B.V. All rights reserved.

Chen S.,Wuhan University of Technology | Tu Y.-C.,University of South Florida | Xia Y.,Indiana University - Purdue University Indianapolis
VLDB Journal | Year: 2011

Many scientific and engineering fields produce large volume of spatiotemporal data. The storage, retrieval, and analysis of such data impose great challenges to database systems design. Analysis of scientific spatiotemporal data often involves computing functions of all point-to-point interactions. One such analytics, the Spatial Distance Histogram (SDH), is of vital importance to scientific discovery. Recently, algorithms for efficient SDH processing in large-scale scientific databases have been proposed. These algorithms adopt a recursive tree-traversing strategy to process point-to-point distances in the visited tree nodes in batches, thus require less time when compared to the brute-force approach where all pairwise distances have to be computed. Despite the promising experimental results, the complexity of such algorithms has not been thoroughly studied. In this paper, we present an analysis of such algorithms based on a geometric modeling approach. The main technique is to transform the analysis of point counts into a problem of quantifying the area of regions where pairwise distances can be processed in batches by the algorithm. From the analysis, we conclude that the number of pairwise distances that are left to be processed decreases exponentially with more levels of the tree visited. This leads to the proof of a time complexity lower than the quadratic time needed for a brute-force algorithm and builds the foundation for a constant-time approximate algorithm. Our model is also general in that it works for a wide range of point spatial distributions, histogram types, and space-partitioning options in building the tree. © 2010 Springer-Verlag.

Moosavi B.,Central China Normal University | Mousavi B.,Wuhan University of Technology | Macreadie I.G.,RMIT University
Journal of Alzheimer's Disease | Year: 2015

The amyloid-β peptide (Aβ) and the phosphorylated protein tau have been widely implicated in Alzheimer's disease and are the focus of most research. Both agents have been extensively studied in mammalian cell culture and in animal studies, but new research is focusing on yeast models. Yeast are eukaryotes, just like us, and are amenable to effects and expression of Aβ and tau and appear able to 'report' with considerable relevance on the effects of these biomolecules. The use of yeast enables powerful new approaches to understanding how to overcome the effects of Aβ and tau, and such advances could lead to new therapies to prevent the progression of Alzheimer's disease. © 2015 - IOS Press and the authors. All rights reserved.

Ye F.,Kings College | Zhou C.,Wuhan University of Technology | Qi B.,Kings College | Qian L.,Kings College
Sensors and Actuators, B: Chemical | Year: 2013

We demonstrate that all-fiber cavity ring-down (CRD) evanescent-field sensing can be performed using frequency-shifted interferometry (FSI). In contrast to conventional CRD schemes, without the need for any optical pulse or fast electronics, this FSI-CRD technique allows one to monitor the intensity decay of a continuous lightwave traveling inside a fiber loop ring-down cavity (RDC), from which the cavity loss information can be deduced. By incorporating a fiber taper as the sensing element inside a RDC, we carried out FSI-CRD experiments with an amplified spontaneous emission source, an acousto-optic modulator, and a slow detector, successfully applying the technique to the measurement of chemical solution concentration based on absorption, solution refractive index change, or a combination of both. A minimum detectable 1-octyne concentration of 0.29% (or 0.020 M) was achieved in decane, while refractive index sensitivity of 1 dB/RIU with a measurement error of 1 × 10 -4 dB was attained in sodium chloride solutions (NaCl in water). The 1-octyne detection limit is better than previously reported values measured by conventional fiber-based CRD techniques. © 2013 Elsevier B.V.

Jian W.,Wuhan University of Technology | Jian W.,Nanchang Institute of Technology
Advances in Information Sciences and Service Sciences | Year: 2012

The aim of the essay is to research the issue of accuracy optimization of image encryption. In order to solve the problems of excessive processing on operation and low efficient operation for traditional chaotic theory, put forward an image encryption algorithm mixed with chaotic encryption technology and neural network. The algorithm that the chaotic sequence generated by chaotic system is applied into image encryption technology could improve significantly security of encryption algorithm in order to acquire a better effect of encryption. The pseudorandom sequence is acquired by combining the neural network and Chebyshev mapping; then performance of the sequence would be analyzed and simulated; finally the sequence would be applied into course of image encryption. Possessing pixel scrambling base on the position scrambling could completely intervene the relevance on pixel of image so that the security of image could be improved significantly. As a result shown by test, the algorithm mentioned in the article possesses effectiveness and practicability in order to process image encryption with a higher security.

Jiang S.P.,Curtin University Australia | Tang H.,Wuhan University of Technology
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2012

Layer-by-layer (LbL) self-assembly of polyelectrolyte bilayers on the methanol permeability and proton conductivity of Nafion membranes is investigated using polycations PDDA (poly(diallyldimethylammonium chloride)) and PAH (poly(allylamine hydrochloride)) and polyanions PAMP (poly(2-acrylamido-2-methyl-1-propanesulfonic acid)), PAZO (poly(1-(4-(3-carboxy-4-hydroxyphenylazo) benzene sulfonamido)-1,2-ethanediyl, sodium salt)), PSS (poly(sodium styrene sulfonate)) and PAA (poly(acrylic acid)). The formation of polyelectrolyte multilayers on Nafion membranes is confirmed by AFM and UV-visible spectroscopy. The lowest methanol permeability is observed on the self-assembled PDDA-PAA and PAH-PAA bilayers with the exponential growth process. The observed exponential growth process of polyelectrolyte multilayers with PAA polyanion is most likely related to small monomeric block of PAA, resulting in low steric hindrance and high flexibility and mobility of the ionomers and thus promoting the interdiffusion of PAA during the self-assembly. PDDA polycation shows a much better ability to block methanol crossover in comparison with that of PAH polycation. This study shows the importance of LbL self-assembled multilayer structure on the proton conductivity and methanol crossover properties of modified Nafion membranes for application in direct methanol fuel cells (DMFCs). © 2012 Elsevier B.V..

Wang H.,Wuhan University of Technology
Advances in Information Sciences and Service Sciences | Year: 2012

For the difference of ability to gain and handle economic information, the inflation expectation of different economic agent in private economic sector will be heterogeneity. This paper estimates the inflation expectation of household and expert respectively and chooses the interbank offered rate for one week as the independent variable. By using Forward-looking Taylor monetary policy reaction function with different expectation as dependent variable, the paper calculate the difference of actual rate and the rule rate basing on different expectation. The result shows that the main reason for the ineffectiveness of monetary policy in recent years may be the monetary policy ignores the inflation expectation of expert.

Su C.,Wuhan Textile University | Tianwei H.,Wuhan University of Technology
Advances in Information Sciences and Service Sciences | Year: 2012

With the rapid development of tourism industry in China, the main function of tourism industry is not only to gain exchange revenue or financial reward, but also to serve social life, to enhance the vitality of market economy, to meet the growing consumers' demand, to promote international exchange and cooperation, to improve the image of the state which have shown that development of tourism in China has entered into a new historical stage. In order to further develop tourism industry, in addition to consider changing the mode of economic growth, emphasizing on the basic role of market for allocating resources and the key role of cultivating market entities for promoting the sustainable and healthy development of tourism economy are also must be returned to consider. It has been ignored the importance of cultivating tourism market entities for a long time, and a sufficient number and competitive tourism market entities has been indeed lacked of in China. In view of present situation and developing problems of China's tourism market entities, this paper proposes strategic approaches of further improving tourism enterprises' operation situation, stimulating tourism consumers' demand and improving comprehensive service quality of tourism providers.

Lei D.,Wuhan University of Technology | Guo X.,Southwest Jiaotong University
International Journal of Production Research | Year: 2014

Dual-resource constrained flexible job shop scheduling problem (FJSP) is considered and an effective variable neighbourhood search (VNS) is presented, in which the solution to the problem is indicated as a quadruple string of the ordered operations and their resources. Two neighbourhood search procedures are sequentially executed to produce new solutions for two sub-problems of the problem, respectively. The search of VNS is restarted from a slightly perturbed version of the current solution of VNS when the determined number of iterations is reached. VNS is tested on some instances and compared with methods from literature. Computational results show the significant advantage of VNS on the problem. © 2013 © 2013 Taylor & Francis.

Zhang X.,Wuhan University of Technology
World Transactions on Engineering and Technology Education | Year: 2014

The analytic method for causality relationships in system dynamics was applied to engineering education in this research study. It focuses on the subsystems of teaching, technological innovation, campus culture and social service. A causality relationship for the coupling of a technological innovation educational system for engineering students was constructed and specific feedback loops were identified. Also outlined in this article is the outcome of the research analysis of the roles played by knowledge inventory, self-knowledge increments and coupling knowledge increments in the education of engineering students.

Yasuda T.,Hirotec Corporation | Yasuda T.,Hiroshima University | Wu C.,Wuhan University of Technology | Nakagawa N.,Hiroshima Kokusai Gakuin University | Nagamura K.,Hiroshima University
Applied Acoustics | Year: 2013

Tail pipe is a most common structure in mufflers to silence low frequency noise from an engine for its acoustic performance of low-pass filter. Based on the typical structure, a muffler with an interconnecting hole on the tail pipe was proposed to improve its acoustic performance in the present research. Acoustic performances of the proposed muffler were studied experimentally and theoretically in frequency and time domain. It was found that the interconnecting hole enabled the proposed muffler to have a noise attenuation performance of Helmholtz resonator. So the proposed muffler can attenuate the noise of low frequency and middle frequency at the same time. The frequency equation of this structure was derived using the acoustic-electronic analogy. It is useful for estimating the attenuation performance at the stages of predesign or tuning. The influence of structure parameters of the proposed muffler on its acoustic performance was studied. According to the results, the design guideline of this muffler was concluded in the present research. © 2012 Elsevier Ltd. All rights reserved.

Wang K.,Wuhan University of Technology | Wang K.,University Paris - Sud | Chen L.,University Paris - Sud
IEEE Transactions on Signal Processing | Year: 2012

Due to its application in numerous engineering problems, the restless multi-armed bandit (RMAB) problem is of fundamental importance in stochastic decision theory. However, solving the RMAB problem is well known to be PSPACE-hard, with the optimal policy usually intractable due to the exponential computation complexity. A natural alternative approach is to seek simple myopic policies which are easy to implement. This paper presents a generic study on the optimality of the myopic policy for the RMAB problem. More specifically, we develop three axioms characterizing a family of generic and practically important functions termed as regular functions. By performing a mathematical analysis based on the developed axioms, we establish the closed-form conditions under which the myopic policy is guaranteed to be optimal. The axiomatic analysis also illuminates important engineering implications of the myopic policy including the intrinsic tradeoff between exploration and exploitation. A case study is then presented to illustrate the application of the derived results in analyzing a class of RMAB problems arising from multi-channel opportunistic access. © 2006 IEEE.

Lu N.,Wuhan University of Technology | Liu Y.,Wuhan Electrical Power Dispatching and Communication Center
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

Combination forecasting model integrates single prediction method according to a certain mode to utilize the information provided by various methods. This paper adopts support vector machine to implement the time-phased varying weight integrated forecasting and to describe nonlinear relationship between the results of different methods and the actual data. A new algorithm SA-MPSO which is based on improved particle swarm optimization and simulated annealing is also put forward to optimize the parameters of support vector machine. The convergence test of this optimization algorithm is studied by using two functions with different characteristics. The results show that the proposed method can avoid the complex weight calculation of the traditional model and has strong self-adaptive ability of parameter optimization, which is helpful to improving the forecasting accuracy.

Chen Y.,University of Maryland University College | Chen Y.,Wuhan University of Technology | Javvaji V.,University of Maryland University College | MacIntire I.C.,University of Maryland University College | Raghavan S.R.,University of Maryland University College
Langmuir | Year: 2013

Hydrophobically modified chitosan (hmC) is a self-assembling polymer that has attracted recent attention for many applications, including as a hemostatic agent. One limitation with chitosan and its derivatives like hmC is that these polymers are soluble in water only under acidic conditions (because the pK a of chitosan is about 6.5), which could be undesirable for biomedical applications. To circumvent this limitation, we have synthesized a derivative of a C12-tailed hmC that is soluble in water at neutral pH. This water-soluble hmC (ws-hmC) is obtained by grafting O-carboxymethyl groups onto some of the primary hydroxyls on hmC. The solubility of ws-hmC at neutral pH is shown to be the result of a net anionic character for the polymer due to ionization of the carboxymethyl groups (in comparison, hmC is cationic). We also demonstrate that ws-hmC retains the self-assembling properties of hmC. Specifically, ws-hmC is able to induce gelation at neutral pH in dispersions of anionic surfactant vesicles as well as polymethylmethacrylate latex nanoparticles. Gelation is attributed to hydrophobic interactions between the hydrophobes on ws-hmC with vesicle bilayers and nanoparticle surfaces. In each case, gelation can be reversed by the addition of α-cyclodextrin, a supramolecule with a hydrophobic cavity that sequesters the hydrophobes on the polymer. © 2013 American Chemical Society.

Lemaire A.,University of Namur | Su B.-L.,University of Namur | Su B.-L.,Wuhan University of Technology
Microporous and Mesoporous Materials | Year: 2011

The effect of tetraethoxysilane (TEOS), tetrapropoxysilane (TPOS), tetrabutoxysilane (TBOS) and a mixture of tetramethoxysilane (TMOS) and TEOS as silicon co-reactant on the formation of hierarchically structured meso-macroporous aluminosilicates and the tetrahedral aluminium content in the framework using a single molecular alkoxide precursor, (sec-BuO) 2-Al-O-Si(OEt)3, has been intensively investigated. The use of alkoxysilane as a co-reactant and highly alkaline media improves the heterocondensation rates between the highly reactive aluminium-alkoxide part of the single molecular precursor and the added alkoxysilanes, and minimizes the cleavage of the intrinsic Al-O-Si linkage. The very unique hierarchical meso-macroporosity was auto-generated by the hydrodynamic flow of solvents released during the rapid hydrolysis and condensation processes of this double alkoxide and the inorganic silica co-reactant. No external structural agent was required to template these porous structures. The particles obtained featured outstanding macrostructure with regular micrometer-sized macrovoids and displaying 3D interconnections. Importantly, the diameter of the micrometer-sized macrovoids found in the final materials and the thickness of the mesoporous walls separating these voids can be tuned by adjusting the reactivity of alkoxysilanes used as co-reactant. Higher reactivity of alkoxysilanes can improve the tetrahedral aluminium content in the meso-macroporous framework and reduce the cleavage of Al-O-Si linkage of the single molecular precursor. These correlations are of primary importance for targeting advanced materials with well defined meso- and macroporosities and tetrahedral aluminium content. © 2010 Elsevier Inc.

Zhao B.,Hebei University of Technology | Hu Z.,Hebei University of Technology | Hu Z.,Wuhan University of Technology
Applied Optics | Year: 2015

This paper presents a novel linear method for camera self-calibration by referring to a known (or calibrated) camera. The method requires at least three images, with two images generated by the uncalibrated camera from pure translation and one image generated by the known reference camera. We first propose a method to compute the infinite homography from scene depths. Based on this, we use two images generated by translating the uncalibrated camera to recover scene depths, which are further utilized to linearly compute the infinite homography between an arbitrary uncalibrated image, and the image from the known camera. With the known camera as reference, the computed infinite homography is readily decomposed for camera calibration. The proposed self-calibration method has been tested with simulation and real image data. Experimental results demonstrate that the method is practical and accurate. This paper proposes using a known reference camera for camera calibration. The pure translation, as required in the method, is much more maneuverable, compared with some strict motions in the literature, such as pure rotation. The proposed self-calibration method has good potential for solving online camera calibration problems, which has important applications, especially for multicamera and zooming camera systems. © 2015 Optical Society of America.

Zhang B.,Huazhong University of Science and Technology | Liu J.,Huazhong University of Science and Technology | Dai G.,Suzhou University of Science and Technology | Chang M.,Wuhan University of Technology | Zheng C.,Huazhong University of Science and Technology
Proceedings of the Combustion Institute | Year: 2015

The selective catalytic reduction (SCR) for the reduction of NOx can enhance the oxidation of elemental mercury, which is regarded as a low-cost option for mercury control in coal-fired power plants. First-principles calculations based on the density functional theory and the periodic slab models were used to gain a fundamental understanding of mercury oxidation mechanism across V2O5/TiO2 SCR catalyst. The adsorption of Hg0, HCl, HgCl, and HgCl2 on V2O5/TiO2(001) surface were studied. The energy profile of the oxidation reaction and the structures of related transition states and intermediates were examined. The results show that Hg0 is mainly physically absorbed on vanadyl-oxygen sites of the V2O5/TiO2(001) surface with an adsorption energy of - 27.93 kJ/mol. HCl is chemisorbed on vanadyl-oxygen sites of V2O5/TiO2(001) surface, and can undergoes dissociation process with an energy barrier of 101.53 kJ/mol to form the vanadium oxy-chloride complex which is essential in Hg0 oxidation reaction on V2O5/TiO2(001) surface. The mercury oxidation reaction occurs through an Eley-Rideal mechanism in which Hg reacts with HCl that has previously been adsorbed and dissociated on V2O5/TiO2(001) surface to form surface HgCl, and then surface HgCl reacts with HCl to form HgCl2, finally HgCl2 desorbs from the V2O5/TiO2(001) surface. In the whole Hg oxidation reaction, the formation of HgCl2 is the rate-determining step based on its high energy barrier. © 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Li J.-H.,Wuhan University of Technology | Yu B.-M.,Huazhong University of Science and Technology
Chinese Physics Letters | Year: 2011

Sierpinski carpet is an exactly self-similar fractal, which is often used to simulate fractal porous media. A simple recursive model for the tortuosity of flow path in Sierpinski carpet is derived based on the self-similarity of the carpet. The proposed model is related to the stage of the carpet, and there is no empirical constant in this model. The model predictions are compared with those from available correlations by both numerical and experimental methods as well as analysis. Good agreement is found between the present model predictions and those from the available correlations. The present model may have the potential in analysis of transport properties in self-similar fractals. © 2011 Chinese Physical Society and IOP Publishing Ltd.

Zou X.,Wuhan University | Wang J.,Wuhan University | Chiu C.-H.,National Chiao Tung University | Wu Y.,National Chiao Tung University | And 8 more authors.
Advanced Materials | Year: 2014

Experimental evidence of the optimized interface engineering effects in MoS 2 transistors is demonstrated. The MoS2/Y2O3/HfO2 stack offers excellent interface control. Results show that HfO2 layer can be scaled down to 9 nm, yet achieving a near-ideal sub-threshold slope (65 mv/dec) and the highest saturation current (526 μA/μm) of any MoS2 transistor reported to date. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhou X.,CAS National Center for Nanoscience and Technology | Xu Q.,CAS National Center for Nanoscience and Technology | Lei W.,CAS National Center for Nanoscience and Technology | Zhang T.,CAS National Center for Nanoscience and Technology | And 4 more authors.
Small | Year: 2014

Visible-light induced degradation of an aqueous mixture containing MO and RhB on well-defined α-Fe2O3 nanocrystals shows that MO degradation is more favorable and such selectivity on the {012} facet is greater than that on {001}. The origin of selectivity is rationalized as the inherent surface structural difference and preferential molecular adsorption. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Hu Z.,Wuhan University of Technology
Journal Wuhan University of Technology, Materials Science Edition | Year: 2014

The starch-g-lactic acid copolymer was synthesized with catalysis of sulfuric acid by onestep process, and the structure of starch-g-lactic acid copolymer was characterized by means of IR, 13C-NMR, HMBC, XRD, and SEM. The experimental results show that the maximum grafting degree of starch can reach 75% when the starch-g-lactic acid copolymer is activated at 80 °C for 2 h and reacted with lactic acid at 90 °C for 4 h in vacuum. © 2014, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.

Yuan X.-H.,Hubei Engineering University | Chen W.,Wuhan University of Technology | Lu Z.-A.,Hubei Engineering University | Chen H.,PLA Logistical Engineering University
Construction and Building Materials | Year: 2014

The shrinkage compensating of alkali activated slag (AAS) concrete with an expanding admixture (EA) composed of anhydrite and quick lime as the expanding source is investigated. The effects of the expanding admixture on the compressive strength and volumetric change of the AAS concrete are tested, followed by microstructural analysis of the hardened AAS pastes. The test results have shown that the EA is effective for compensating the shrinkage of AAS concrete. Ettringite is not formed in the AAS paste. Formation of the calcium hydroxide in the AAS paste is the main expanding source. Adding EA into the AAS concrete can increase its early age compressive strength, but lowers slightly the late age compressive strength. © 2014 Elsevier Inc. All rights reserved.

Zhang X.,Wuhan University of Technology
2010 International Conference on Intelligent Computation Technology and Automation, ICICTA 2010 | Year: 2010

In order to rationally control the distribution of traffic flow and avoid traffic congestion, improve the utilization of road network, a traffic-induced model is used in this paper.Various states of the road network are graded following the dynamic traffic assignment ideas. Complex traffic-induced problems are resolved by comparing the size of the state transition probability.For illustration, a road network example is utilized to show the feasibility of the traffic-induced model in solving traffic Control problem with the transition probability. Empirical results show that the size of the state transition probability can intuitively reflect the state of the road network system in the future.The traffic-induced model can achieve the pre-control of traffic flow and greatly reduce the probability of paralysis in the road network system. © 2010 IEEE.

Chen C.,Wuhan University of Technology
Optik | Year: 2013

Based on the density functional pseudopotential method, the electronic structures and the optical properties of CdI2 doped with Cu are investigated in detail. The calculation results indicate that the defect of Cu(Cd) exists steadily with a certain solubility. For the Cu doped CdI 2, the new highly localized impurity bands induced by Cu 3d states lie just across the Fermi energy at the top of the valence band. The doping of Cu induces reduction of band gap of CdI2; red shifts are revealed in both the imaginary part of dielectric function and the absorption spectra corresponding to the change in band gaps. Moreover, the study of the reflection spectrum and the loss function shows that the doped Cu is responsible for the increased reflection peak intensity and the red shift of the plasma resonant frequency of CdI2. © 2012 Elsevier GmbH.

Yuan Y.,Wuhan University of Technology | Yuan X.,Huazhong University of Science and Technology
Kybernetes | Year: 2010

Purpose: The purpose of this paper is to establish the optimization model and solve the short-term economic dispatch of cascaded hydro-plants. Design/methodology/approach: An improved particle swarm optimization (IPSO) approach is proposed to solve the short-term economic dispatch of cascaded hydroelectric plants. The water transport delay time between connected reservoirs is taken into account and it is easy in dealing with the difficult hydraulic and power coupling constraints using the proposed method in practical cascaded hydroelectric plants operation. The feasibility of the proposed method is demonstrated for actual cascaded hydroelectric plant. Findings: The simulation results show that this approach can prevent premature convergence to a high degree and keep a rapid convergence speed. Research limitations/implications: The optimal values of parameters in the proposed method are the main limitations where the method will be applied to the economic operation of the hydro-plant. Practical implications: The paper presents useful advice for short-term economic operations of the hydro-plant. A new optimization method to solve the short-term optimal generation scheduling is proposed. The optimal generation power and water discharge during the whole dispatching time for hydro-plant operation can be obtained. Originality/value: The IPSO method is realized by maintaining high diversity of the swarm during the optimization process and preventing premature convergence. © Emerald Group Publishing Limited.

Luo L.,Wuhan University of Technology
Journal of Computational and Theoretical Nanoscience | Year: 2015

The problem of assigning frequencies to transmitters in a radio network can be modeled through vertex labelings of a graph, wherein each vertex represents a transmitter and edges connect vertices whose corresponding transmitters are operating in close proximity. In one such model, a k-L(2, 1)- labeling of a graph G is an assignment of labels from {0, 1, ⋯ ,k} to the vertices of G such that vertices at distance two get different labels and adjacent vertices get labels that are at least two apart. The λ-number (G) of G is the minimum value k such that G admits a k-L(2, 1)-labeling. The L(2, 1)-labeling problem consists of finding the minimum λ-number of a graph. This paper presents a multistart iterated reactive tabu search heuristic (MIRTS) for the L(2, 1)-labeling problem. MIRTS incorporates the multistart feature and iterated reactive tabu scheme. The algorithm has been successfully applied to the L(2, 1)-labeling problem of interesting hypercubes graphs and find improved upper bounds of the λ-numbers for some of these graphs. Copyright © 2015 American Scientific Publishers.

Li C.,Beihang University | Li L.,Wuhan University of Technology
International Journal of Web and Grid Services | Year: 2013

This paper provides an optimal approach to satisfy cloud user requests and schedule resources within cloud computing environment. The paper exploits the market concept into the interaction among the Software as a Service (SaaS) services providers, service users and cloud infrastructures suppliers. The paper formulates SaaS solution as multiple optimal problems. The proposed model takes into account the SaaS user constraints, the SaaS provider constraints, and VM constraints in respect to the VM and physical machine owners/providers. It considers constraints such as SaaS user budget and deadline, SaaS provider profit, and cloud resource provider profit, as well as viewing the SaaS provider as both as resource provider and consumer. Copyright © 2013 Inderscience Enterprises Ltd.

Chong B.,Wuhan University of Technology
KSCE Journal of Civil Engineering | Year: 2010

We study non-linear fracture of concrete by discrete cohesive crack model in the context of the Element-Free Galerkin (EFG) method. The crack surface is represented by several straight-line interface elements. The constitutive law of cohesive cracks is considered through the use of these interface elements. The stiffness equation of the domain is constructed by directly including a term in the weak form of the global system equation that is related to the energy dissipation along the interface elements. The constitutive law of cohesive cracks can then be considered directly and efficiently by using this energy term. The validity and efficiency of the proposed method are discussed by using several problems. © 2010 Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg.

Zhao M.,City University of Hong Kong | Zhang Z.,Soochow University of China | Chow T.W.S.,City University of Hong Kong | Li B.,Wuhan University of Technology
Neural Networks | Year: 2014

Dealing with high-dimensional data has always been a major problem in research of pattern recognition and machine learning, and Linear Discriminant Analysis (LDA) is one of the most popular methods for dimension reduction. However, it only uses labeled samples while neglecting unlabeled samples, which are abundant and can be easily obtained in the real world. In this paper, we propose a new dimension reduction method, called "SL-LDA", by using unlabeled samples to enhance the performance of LDA. The new method first propagates label information from the labeled set to the unlabeled set via a label propagation process, where the predicted labels of unlabeled samples, called "soft labels", can be obtained. It then incorporates the soft labels into the construction of scatter matrixes to find a transformed matrix for dimension reduction. In this way, the proposed method can preserve more discriminative information, which is preferable when solving the classification problem. We further propose an efficient approach for solving SL-LDA under a least squares framework, and a flexible method of SL-LDA (FSL-LDA) to better cope with datasets sampled from a nonlinear manifold. Extensive simulations are carried out on several datasets, and the results show the effectiveness of the proposed method. © 2014 Elsevier Ltd.

Lam K.,Hong Kong Polytechnic University | Lin Y.F.,Hong Kong Polytechnic University | Zou L.,Wuhan University of Technology | Liu Y.,Hong Kong Polytechnic University
Journal of Fluids and Structures | Year: 2010

A large eddy simulation (LES) study was conducted to investigate the three-dimensional characteristics of the turbulent flow past wavy cylinders with yaw angles from 0° to 60° at a subcritical Reynolds number of 3900. The relationships between force coefficients and vortex shedding frequency with yaw angles for both wavy cylinders and circular cylinders were investigated. Experimental measurements were also performed for the validation of the present LES results. Comparing with corresponding yawed circular cylinders at similar Reynolds number, significant differences in wake vortex patterns between wavy cylinder and circular cylinder were observed at small yaw angles. The difference in wake pattern becomes insignificant at large yaw angles. The mean drag coefficient and the Strouhal number obey the independence principle for circular cylinders at yaw angle less than 45°, while the independence principle was found to be unsuitable for yawed wavy cylinders. In general, the mean drag coefficients and the fluctuating lift coefficients of a yawed wavy cylinder are less than those of a corresponding yawed circular cylinder at the same flow condition. However, with the increase of the yaw angle, the advantageous effect of wavy cylinder on force and vibration control becomes insignificant. © 2010 Elsevier Ltd.

Zhang J.,CAS Fujian Institute of Research on the Structure of Matter | Wang Y.,CAS Fujian Institute of Research on the Structure of Matter | Lin Z.,Wuhan University of Technology | Huang F.,CAS Fujian Institute of Research on the Structure of Matter | Yu J.,CAS Fujian Institute of Research on the Structure of Matter
ACS Applied Materials and Interfaces | Year: 2013

Au-nanoparticle-decorated ZnS nanoarchitectures were fabricated by a simple hydrothermal approach combined with a deposition-precipitation method. After the deposition-precipitation process, 5-nm Au nanoparticles were homogeneously dispersed on the ZnS surface. In addition, the band gap of ZnS was also narrowed by the incorporation of a small amount of Au(I) ions. The photocatalytic hydrogen production activities of all the samples were evaluated by using Na2S and Na2SO3 as sacrificial reagents in water under a 350 W xenon arc lamp. The results show that the photocatalytic hydrogen production rate of ZnS nanoarchitectures can be significantly improved by loading Au cocatalysts and reaches an optimal value (3306 μmol h -1 g-1) at the Au content of 4% wt. Although strong surface plasmon resonance (SPR) absorption of the Au nanoparticles was found in the Au-loaded samples, all of these samples exhibit no activities in the visible light region (λ > 420 nm). On the basis of this Au/ZnS system, the possible roles of Au deposition in improving the photocatalytic hydrogen production activity, especially the necessary condition for SPR effect of metal nanostructures to function in the visible-light photocatalysis, are critically discussed. © 2012 American Chemical Society.

Lan S.,CAS Wuhan Institute of Hydrobiology | Wu L.,CAS Wuhan Institute of Hydrobiology | Zhang D.,Wuhan University of Technology | Hu C.,CAS Wuhan Institute of Hydrobiology
Microbial Ecology | Year: 2013

Biological soil crusts (BSCs) perform vital ecosystem services, but the difference in biological components or developmental level still affects the rate and type of these services. In order to differentiate crust successional stages in quantity and analyze the relationship between crust developmental level and successional stages, this work determined several biological indicators in a series of different developmental BSCs in the Shapotou region of China. The results showed that crust developmental level (level of development index) can be well indicated by crust biological indicators. Photosynthetic biomass was the most appropriate to differentiate crust successional stages, although both photosynthetic biomass and respiration intensity increased with the development and succession of BSCs. Based on of the different biological compositions, BSCs were quantificationally categorized into different successional stages including cyanobacterial crusts (lichen and moss coverages <20 %), lichen crusts (lichen coverage >20 % but moss coverage <20 %), semi-moss crusts (moss coverage >20 % but <75 %), and moss crusts (moss coverage >75 %). In addition, it was found that cyanobacterial and microalgal biomass first increased as cyanobacterial crusts formed, then decreased when lots of mosses emerged on the crust surface; however nitrogen-fixing cyanobacteria and heterotrophic microbes increased in the later developmental BSCs. The structural adjustment of biological components in the different developmental BSCs may reflect the requirement of crust survival and material transition. © 2013 Springer Science+Business Media New York.

Zhang D.L.,Wuhan University of Technology | Hu C.X.,CAS Wuhan Institute of Hydrobiology | Li D.H.,CAS Wuhan Institute of Hydrobiology | Liu Y.D.,CAS Wuhan Institute of Hydrobiology
Aquatic Toxicology | Year: 2013

Aphanizomenon flos-aquae is a cyanobacterium that is frequently encountered in eutrophic waters worldwide. It is source of neurotoxins known as aphantoxins or paralytic shellfish poisons (PSPs), which present a major threat to the environment and human health. The molecular mechanism of PSP action is known, however the in vivo effects of this neurotoxin on oxidative stress, lipid peroxidation and the antioxidant defense responses in zebrafish brain remain to be understood. Aphantoxins purified from a natural isolate of A. flos-aquae DC-1 were analyzed using high performance liquid chromatography. The major components of the toxins were gonyautoxins 1 and 5 (GTX1 and GTX5, 34.04% and 21.28%, respectively) and neosaxitoxin (neoSTX, 12.77%). Zebrafish (Danio rerio) were injected intraperitoneally with 7.73. μg/kg (low dose) and 11.13. μg/kg (high dose) of A. flos-aquae DC-1 aphantoxins. Oxidative stress, lipid peroxidation and antioxidant defense responses in the zebrafish brain were investigated at various timepoints at 1-24. h post-exposure. Aphantoxin exposure was associated with significantly increased (>1-2 times) reactive oxygen species (ROS) and malondialdehyde (MDA) in zebrafish brain compared with the controls at 1-12. h postexposure, suggestive of oxidative stress and lipid peroxidation. In contrast, reduced glutathione (GSH) levels in the zebrafish brain exposed to high or low doses of aphantoxins decreased by 44.88% and 41.33%, respectively, after 1-12. h compared with the controls, suggesting that GSH participated in detoxification to ROS and MDA. Further analysis showed a significant increase in the activities of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) compared with the controls, suggesting elimination of oxidative stress by the antioxidant response in zebrafish brain. All these changes were dose and time dependent. These results suggested that aphantoxins or PSPs increased ROS and MDA and decreased GSH in zebrafish brain, and these changes induced oxidative stress. The increased activity of SOD, CAT and GPx demonstrated that these antioxidant enzymes could play important roles in eliminating excess ROS and MDA. These results also suggest that MDA, ROS, GSH and these three antioxidant enzymes in the brain of zebrafish may act as bioindicators for investigating A. flos-aquae DC-1 aphantoxins or PSPs and algal blooms in nature. © 2013 Elsevier B.V.

Jin L.,Wuhan University of Technology | Wu Y.,Hubei University
Journal of Molecular Recognition | Year: 2011

δ-Dendrotoxin, isolated from mamba snake venom, has 57 residues cross-linked by three disulfide bridges. The protein shares a pharmacological activity with other animal toxins, the potent blockade of potassium channels, but is structurally unrelated to toxins of different species. We employed alanine-scanning mutagenesis to explore the molecular mechanism of δ-dendrotoxin binding to potassium channels, using protein-protein docking and molecular dynamic simulations. In our reasonable model of the δ-dendrotoxin-ShaKv1.1 complex, δ-dendrotoxin interacted mainly with the N-terminal region and the turn of two antiparallel β-sheets of the channel. This binding mode could well explain the functional roles of critical residues in δ-dendrotoxin and the ShaKv1.1 channel. Structural analysis indicated that the critical Lys6 residue of δ-dendrotoxin plugged its side chain into a channel selectivity filter. Another two critical δ-dendrotoxin residues, Lys3 and Arg10, were found to contact channel residues through strong polar and nonpolar interactions, especially salt-bridge interactions. As for the ShaKv1.1 channel, the channel turrets were found in the "half-open state," and two of four Glu423 in the turrets of the channel B and D chains could interact, respectively, with Lys3 and Lys26 of δ-dendrotoxin through electrostatic interactions. The essential Asp431 channel residue was found to associate electrostatically with Arg10 of δ-dendrotoxin, and a critical Tyr449 channel residue was just under the channel-interacting surface of δ-dendrotoxin. Together, these novel data may accelerate the structure-function research of toxins in the dendrotoxin family and be of significant value in revealing the diverse interactions between animal toxins and potassium channels. Copyright © 2010 John Wiley & Sons, Ltd.

Xiang K.,Wuhan University of Technology | Li B.-N.,Hefei University of Technology
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2012

Principal component analysis (PCA) is a popular multivariate statistic technique. However, the principal component estimation is often inconsistent while the samples are high-dimensional, and the principal component meaning is unintelligible too. The above two difficulties can be partially overcome by variable selection with sparse constraints. The basic concept of sparsity and the design standard of penalties were described in this survey. A typical sparse constraint, lasso, was introduced as well as its related morphs: fused lasso, group lasso, adaptive lasso and elastic net. Any of these constraints can be added into PCA to build a framework of spars PCA, and the emphasis was on how to transform sparse PCA into a convex optimizing problem and quickly solve it. Many transforming styles on sparse PCA were compared: singular value decomposition, sparse regression, low rank matrix approximation, penalized matrix decomposition and semi-definite relaxations. The approaches to solving the common and generalized lasso problems were analyzed based on least angle regression (LAR). The element of sparse PCA in functional data was discussed as a prospect.

Zhang M.,Technical University of Delft | He Y.,Wuhan University of Technology | Ye G.,Technical University of Delft | Lange D.A.,Urbana University | Breugel K.V.,Technical University of Delft
Construction and Building Materials | Year: 2012

The mass diffusivity in Portland cement paste plays an important role in the durability design and assessment of cement-based materials. This paper presents a link between mass diffusivity in cement paste and its microstructure. X-ray computed microtomography (μCT) was applied to derive the three-dimensional (3D) images of cement paste specimens with water-to-cement (w/c) ratio 0.50 at curing ages of 1, 3, 7, 28 and 120 days at a resolution of 0.485 μm/voxel. By choosing the image threshold value based on the gray level histogram, the phases, i.e., capillary pores, hydration products and unhydrated cement grains in the microtomography images of each specimen were segmented and the 3D microstructure and pore structure were obtained. The degree of pore connectivity and percolation of each specimen were analyzed in detail on the basis of cluster-labeling algorithm. In addition, the finite element method (FEM) was applied to simulate the diffusion process of tritiated water through the extracted microstructure and quantify the diffusivity of tritiated water by associating with Fick's law. The simulated diffusivity was compared with the measured value and seemed consistent with the experimental investigation. The results suggest that X-ray μCT is a reliable non-destructive technique and suitable tool to investigate the 3D microstructure. The obtained microstructure can be considered as an input to predict the transport properties of cement-based materials. © 2011 Elsevier Ltd. All rights reserved.

Bi Q.,Wuhan University of Technology
Frontiers of Physics | Year: 2015

A formalism of quantum computing with 2000 qubits or more in decoherence-free subspaces is presented. The subspace is triangular with respect to the index related to the environment. The quantum states in the subspaces are projected states ruled by a subdynamic kinetic equation. These projected states can be used to perform general, large-scale decoherence-free quantum computing. © 2015, Higher Education Press and Springer-Verlag Berlin Heidelberg.

Shuhua M.,Wuhan University of Technology
2010 International Conference on Computational Intelligence and Software Engineering, CiSE 2010 | Year: 2010

Hasse diagram is a very popular method for multicriteria evaluation and decision making, but now we just use no-weighted Hasse diagram for each attribute. This paper concerns how to get the weighted Hasse diagram. Firstly, assessment cumulated matrix based on the weights of each attribute is proposed, then the weighted Hasse diagram can be drawn, and Bubley Dyer algorithm , which is a Monte Carlo Markov chain procedure , can be used to calculate the rank of the element in the matrix. ©2010 IEEE.

Lu N.,Wuhan University of Technology | Wu B.-L.,Xuchang Senior Technical School | Liu Y.,Wuhan Power Supply Corporation
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

In order to improve the precision of short-term load forecasting, and aiming at the parameter selection of traditional SVM in load forecast this paper proposes a new load forecasting model, i.e., using the improved adaptive particle swarm optimization(PSO) for seeking the optimal parameters of support vector machine(SVM) model. The classical PSO is a global optimization algorithm. Based on it, the improved PSO(FAPSO) is proposed and its convergence tests are conducted, and then the SVM model based on the FAPSO optimization is applied to the short-term power load forecasting. The simulation results show that the adaptive particle swarm optimization-based SVM load forecasting model is more accurate than the traditional SVM model and has certain practical value.

Wei F.,Wuhan University of Technology | Lin H.,Hubei University of Automotive Technology
Journal of Mechanical Science and Technology | Year: 2011

Precision forging of the helical gear is a complex metal forming process under coupled effects with multi-factors. The various process parameters such as deformation temperature, punch velocity and friction conditions affect the forming process differently, thus the optimization design of process parameters is necessary to obtain a good product. In this paper, an optimization method for the helical gear precision forging is proposed based on the finite element method (FEM) and Taguchi method with multi-objective design. The maximum forging force and the die-fill quality are considered as the optimal objectives. The optimal parameters combination is obtained through S/N analysis and the analysis of variance (ANOVA). It is shown that, for helical gears precision forging, the most significant parameters affecting the maximum forging force and the die-fill quality are deformation temperature and friction coefficient. The verified experimental result agrees with the predictive value well, which demonstrates the effectiveness of the proposed optimization method. © 2011 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

Wang X.,University of Munster | Gan H.,University of Munster | Gan H.,Beijing Institute of Transfusion Medicine | Sun T.,University of Munster | Sun T.,Wuhan University of Technology
Advanced Functional Materials | Year: 2011

Chiral polymer brush films based on L(D)-valine units show different abilities to modulate protein adsorption onto the surface. This provides a novel biomimetic strategy for the design of biointerface materials and devices. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xie X.,CAS Guangzhou Institute of Geochemistry | Sun Z.,Wuhan University of Technology | Chen M.,CAS Guangzhou Institute of Geochemistry
Meteoritics and Planetary Science | Year: 2011

The morphology and petrology of distinct melt veins in the Suizhou L6 chondrite have been investigated using scanning electron microscopy, electron microprobe analyses, and Raman spectroscopy, synchrotron energy-dispersive diffraction, and transmission electron microscopy. It is found that the melt veins in the Suizhou meteorite morphologically are the simplest, straightest, and thinnest among all shock veins known from meteorites. At first glance, these veins look like fine fractures, but petrologically they are solid melt veins of chondritic composition and consist of fully crystalline materials of two distinct lithological assemblages, with no glassy material remaining. The Suizhou melt veins contain the most abundant high-pressure mineral species when compared with all other veins known in chondrites. Thus, these veins in Suizhou are classified as shock veins. All rock-forming and almost all accessory minerals in the Suizhou shock veins have been transformed to their high-pressure polymorphs, and no fragments of the precursor minerals remain in the veins. Among the 11 high-pressure mineral phases identified in the Suizhou veins, three are new high-pressure minerals, namely, tuite after whitlockite, xieite, and the CF phase after chromite. On the basis of transformation of plagioclase into maskelynite, it is estimated that the Suizhou meteorite experienced shock pressures and shock temperatures up to 22GPa and 1000°C, respectively. Shearing and friction along shock veins raised the temperature up to 1900-2000°C and the pressure up to 24GPa within the veins. Hence, phase transition and crystallization of high-pressure minerals took place only in the Suizhou shock veins. Fast cooling of the extremely thin shock veins is regarded as the main reason that up to 11 shock-induced high-pressure mineral phases could be preserved in these veins. © The Meteoritical Society, 2011.

Liu C.,Wuhan University of Technology | Heo J.,Pohang University of Science and Technology | Heo J.,The American Ceramic Society
International Journal of Applied Glass Science | Year: 2013

Tunable absorption and photoluminescence (PL) of lead chalcogenide quantum dots (QDs) doped in glasses due to the quantum confinements effect have been actively investigated for application as saturable absorbers, laser sources, and fiber-optic amplifiers. Optical properties of QDs have been carefully monitored by controlling their sizes through heat treatment and rare-earth ion doping. Two- and three-dimensional precipitation of lead chalcogenide QDs were also realized using silver ion exchange and femtosecond laser irradiation in combination with thermal treatment. Prototypes of microstructured single-mode fibers and tapered fiber amplifiers containing QDs proved potentials of these materials for fiber-optic amplifiers application. Further research works on QD-doped solid core fibers, surface passivation of quantum dots and their application for the mid-infrared optical devices are necessary. © 2013 The American Ceramic Society and Wiley Periodicals, Inc.

Tang Y.,Yanshan University | Liu Y.,Yanshan University | Yu S.,Yanshan University | Mu S.,Wuhan University of Technology | And 3 more authors.
Journal of Power Sources | Year: 2014

A facile hydrothermal process with hexadecyltrimethyl ammonium bromide (CTAB) as the soft template is proposed to tune the morphology and size of cobalt hydroxide (Co(OH)2). Monodisperse β-phase Co(OH) 2 nanowires with uniform size are obtained by controlling the CTAB content and the reaction time. Due to the uniform well-defined morphology and stable structure, the Co(OH)2 nanowires material exhibits high capacitive performance and long cycle life. The specific capacitance of the Co(OH)2 nanowires electrode is 358 F g-1 at 0.5 A g -1, and even 325 F g-1 at 10 A g-1. The specific capacitance retention is 86.3% after 5000 charge-discharge cycles at 2 A g-1. Moreover, the asymmetric supercapacitor is assembled with Co(OH)2 nanowires and nitrite acid treated activated carbon (NTAC), which shows an energy density of 13.6 Wh kg-1 at the power density of 153 W kg-1 under a high voltage of 1.6 V, and 13.1 Wh kg -1 even at the power density of 1.88 kW kg-1. © 2014 Elsevier B.V. All rights reserved.

Lei D.,Wuhan University of Technology
Applied Soft Computing Journal | Year: 2015

In this paper hybrid flow shop scheduling problem with two agents is studied and its feasibility model is considered. A two-phase neighborhood search (TNS) algorithm is proposed to minimize objectives of two agents simultaneously under the given upper bounds. TNS is constructed through the combination of multiple variable neighborhood mechanisms and a new perturbation strategy for new current solution. A new replacement principle is also applied to decide if the current solution can be updated. TNS is tested on a number of instances and compared with the existing methods. The computational results show the promising advantage of TNS on the considered problem. © 2015 Elsevier B.V. All rights reserved.

Dai K.,Huaibei Normal University | Lu L.,Wuhan University of Technology | Liang C.,CAS Hefei Institutes of Physical Science | Liu Q.,CAS Institute of Microelectronics | Zhu G.,Huaibei Normal University
Applied Catalysis B: Environmental | Year: 2014

Novel construction of a heterojunction structure by facet coupling of surface-fluorinated TiO2 (F-TiO2) nanosheet onto g-C3N4 nanosheet as a visible light photocatalyst was achieved through a simple hydrothermal method. Facet coupled structure between F-TiO2-{001} nanosheet and g-C3N4-{002} nanosheet was evidently investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), Fourier transform infrared (FT-IR) spectroscopy and UV-vis diffuse reflectance spectroscopy (DRS). The g-C3N4/F-TiO2 facet coupled hybrid with remarkably increased interfacial area presented a significantly enhanced photocatalytic performance in degrading methylene blue (MB) under 410nm LED light irradiation. The obviously reduced electron-hole recombination rate of hybrid was demonstrated from photoluminescence (PL) spectroscopy measurements and the photoelectrochemical evaluation. An optimal g-C3N4 content has been determined to be 30wt%, corresponding to apparent pseudo-first-order rate constant kapp of 0.0374min-1. It is 4.5 times and 13.9 times more than that of pure F-TiO2 nanosheets and commercial P25 photocatalyst, respectively. © 2014 Elsevier B.V.

Ma R.,City University of Hong Kong | Lu Z.,South University of Science and Technology of China | Wang C.,City University of Hong Kong | Wang H.-E.,Wuhan University of Technology | And 3 more authors.
Nanoscale | Year: 2013

Graphene-wrapped FeF3 nanocrystals (FeF3/G) have been successfully fabricated for the first time by a vapour-solid method, which can be generalized to synthesize other metal fluorides. The as-synthesized FeF 3/G delivers a charge capacity of 155, 113, and 73 mA h g -1 at 104, 502, and 1040 mA g-1 in turn, displaying superior rate capability to bare FeF3. Moreover, it exhibits stable cyclability over 100 cycles with a charge capacity of 185.6 and 119.8 mA h g-1 at 20.8 and 208 mA g-1, respectively, which could be ascribed to the buffering effect and lowered resistance from the graphene. This versatile vapour-solid method and the improved cyclability provide a promising avenue for the application of metal fluorides as cathode materials. © 2013 The Royal Society of Chemistry.

Liu J.,Huazhong University of Science and Technology | He M.,Huazhong University of Science and Technology | Zheng C.,Huazhong University of Science and Technology | Chang M.,Wuhan University of Technology
Proceedings of the Combustion Institute | Year: 2011

The installation of selective catalytic reduction (SCR) system for reduction of NOx can prompt the oxidation and removal of elemental mercury. Understanding the mechanism behind Hg oxidation via SCR catalysts will broaden the applicability of SCR system in Hg removal strategies. This research investigated the bindings of Hg0, HCl, HgCl and HgCl2 to the V2O5 (0 0 1) surface using density functional theory (DFT) method. The V2O5 (0 0 1) surface was represented by a periodic model, and different adsorption sites were considered. Adsorption energies and geometries of Hg0, HCl, HgCl and HgCl2 on the V2O5 surface were calculated. The results indicated that Hg0 adsorption on V2O5 surface is stronger than that of HCl. The adsorptions of HgCl and HgCl2 on V 2O5 surface are mainly chemisorption. The adsorption energy of HgCl on V2O5 surface is stronger than that of HgCl2, which means that HgCl-surface is an important intermediate for mercury oxidation. The chlorine species has a strong influence on mercury adsorption as well as mercury oxidation, which is compatible with the available experimental results. The oxidation pathway for V2O 5-catalyzed Hg oxidation by chlorine species was also presented. © 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.