Wuhan, China
Wuhan, China

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.

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Patent
Wuhan University of Technology | Date: 2016-06-13

The invention provides a radial ring rolling process for controlling strain distribution of a ring product. In the process, a ring blank is rolled by a main roll and a mandrel that are driven to rotate, while a gap between the main roll and the mandrel continuously decreases in the radial direction of the ring blank. The process includes (A) according to dimensions of the ring product and expected strain, a rolling ratio is firstly determined, dimensions of the ring blank is calculated based on the rolling ratio and the dimensions of the ring product; (B) a rotation speed curve of the mandrel is determined based on the rotation and the radial feeding speeds of the main roll; (C) the ring blank is rolled according to the rotation and radial feeding speeds of the main roll and the calculated rotation speed of mandrel in step (B).

Ding M.,Wuhan University of Technology | Li Y.,Shanghai JiaoTong University
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2017

We study the 1-D piston problem for the relativistic Euler equations under the assumption that the total variations of both the initial data and the velocity of the piston are sufficiently small. By a modified wave front tracking method, we establish the global existence of entropy solutions including a strong rarefaction wave without restriction on the strength. Meanwhile, we consider the convergence of the entropy solutions to the corresponding entropy solutions of the classical non-relativistic Euler equations as the light speed c→ + ∞. © 2017, Springer International Publishing.

HAN H.,CAS Wuhan Institute of Physics and Mathematics | ZHOU H.-S.,Wuhan University of Technology
Acta Mathematica Scientia | Year: 2017

The existence of a global minimizer for a variational problem arising in registration of diffusion tensor images is proved, which ensures that there is a regular spatial transformation for the registration of diffusion tensor images. © 2017 Wuhan Institute of Physics and Mathematics

DING M.,Wuhan University of Technology | GONG S.,Shanghai JiaoTong University
Acta Mathematica Scientia | Year: 2017

We consider the vibration of elastic thin plates under certain reasonable assumptions. We derive the nonlinear equations for this model by the Hamilton Principle. Under the conditions on the hyperbolicity for the initial data, we establish the local time well-posedness for the initial and boundary value problem by Picard iteration scheme, and obtain the estimates for the solutions. © 2017 Wuhan Institute of Physics and Mathematics

Liang Y.,Wuhan University of Technology | Liu L.,Gansu Meteorological Bureau
Journal of Land Use Science | Year: 2017

Spatially explicit integrated assessment of ecosystem services is a new and important research field in landscape ecology. The objective of this paper was to develop an integrated process-based modeling method to simulate changes in multiple ecosystem services in 2000–2009 at pixel and regional scales in the Zhangye oasis of northwestern China. Six ecosystem service indicators were selected and quantified using process-based models, including net primary production (NPP), grain production, net oxygen production (NOP), carbon sequestration (CS), water conservation, and soil conservation. Analytical results were as follows: (1) At the oasis scale, NPP, NOP, CS, water conservation, and soil conservation decreased from 2000 to 2009, whereas grain production increased. (2) At the pixel scale, the spatial changes in NPP were similar to those in NOP and CS, but changes in grain production showed the opposite pattern. Water conservation and soil conservation showed somewhat unintuitive spatial patterns. (3) The impact of land-use forms on ecosystem services showed that grazing and township construction both had negative impacts on all services, but that nature conservation and wetland development had positive impacts on all services. This research showed that the integrated modeling can be proposed as an environmental decision-making tool in similar case studies. © 2017 Informa UK Limited, trading as Taylor & Francis Group

de Richter R.,National Graduate School of Chemistry, Montpellier | Ming T.,Wuhan University of Technology | Davies P.,Aston University | Liu W.,Huazhong University of Science and Technology | Caillol S.,National Graduate School of Chemistry, Montpellier
Progress in Energy and Combustion Science | Year: 2017

Large-scale atmospheric removal of greenhouse gases (GHGs) including methane, nitrous oxide and ozone-depleting halocarbons could reduce global warming more quickly than atmospheric removal of CO2. Photocatalysis of methane oxidizes it to CO2, effectively reducing its global warming potential (GWP) by at least 90%. Nitrous oxide can be reduced to nitrogen and oxygen by photocatalysis; meanwhile halocarbons can be mineralized by red-ox photocatalytic reactions to acid halides and CO2. Photocatalysis avoids the need for capture and sequestration of these atmospheric components. Here review an unusual hybrid device combining photocatalysis with carbon-free electricity with no-intermittency based on the solar updraft chimney. Then we review experimental evidence regarding photocatalytic transformations of non-CO2 GHGs. We propose to combine TiO2-photocatalysis with solar chimney power plants (SCPPs) to cleanse the atmosphere of non-CO2 GHGs. Worldwide installation of 50,000 SCPPs, each of capacity 200 MW, would generate a cumulative 34 PWh of renewable electricity by 2050, taking into account construction time. These SCPPs equipped with photocatalyst would process 1 atmospheric volume each 14–16 years, reducing or stopping the atmospheric growth rate of the non-CO2 GHGs and progressively reducing their atmospheric concentrations. Removal of methane, as compared to other GHGs, has enhanced efficacy in reducing radiative forcing because it liberates more °OH radicals to accelerate the cleaning of the troposphere. The overall reduction in non-CO2 GHG concentration would help to limit global temperature rise. By physically linking greenhouse gas removal to renewable electricity generation, the hybrid concept would avoid the moral hazard associated with most other climate engineering proposals. © 2017 The Authors

Ding L.,Wuhan University of Technology | Tong X.,Wuhan University of Technology | Yu L.,Wuhan Textile University
Journal of Biomedical Optics | Year: 2017

This paper presents a method that uses fiber Bragg grating (FBG) sensors to distinguish the temporal gait patterns in gait cycles. Unlike most conventional methods that focus on electronic sensors to collect those physical quantities (i.e., strains, forces, pressure, displacements, velocity, and accelerations), the proposed method utilizes the backreflected peak wavelength from FBG sensors to describe the motion characteristics in human walking. Specifically, the FBG sensors are sensitive to external strain with the result that their backreflected peak wavelength will be shifted according to the extent of the influence of external strain. Therefore, when subjects walk in different gait patterns, the strains on FBG sensors will be different such that the magnitude of the backreflected peak wavelength varies. To test the reliability of the FBG sensor platform for gait pattern detection, the gold standard method using force-sensitive resistors (FSRs) for defining gait patterns is introduced as a reference platform. The reliability of the FBG sensor platform is determined by comparing the detection results between the FBG sensors and FSRs platforms. The experimental results show that the FBG sensor platform is reliable in gait pattern detection and gains high reliability when compared with the reference platform. © 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).

Li A.,Wuhan University of Technology | Zhao Z.,Wuhan University of Technology
Mathematical Problems in Engineering | Year: 2017

Crane safety evaluation is significant for reducing the casualties and economic losses. Various evaluation methods have been applied to evaluate crane safety. However, when index standard with respect to every level is described in terms of intervals, existing crane safety evaluation models are not ideal. Although variable fuzzy sets (VFS) method has successfully solved similar problems, its evaluation processes are rather complex complicated and tedious. In this paper, we provided an improved VFS evaluation method with normal membership function for solving crane safety problem, in which the evaluation criteria are described in terms of intervals. To demonstrate our presented method, the improved variable fuzzy sets (IVFS) method was applied to two numerical cases including an application to crane safety assessment. It is shown that our proposed method possesses the merit to simplify assessment processes of traditional VFS and can be applied to assess crane safety when criteria values are defined as interval numbers. © 2017 Aihua Li and Zhangyan Zhao.

Yue J.,Wuhan University of Technology | Dang Z.,Wuhan University of Technology | Guedes Soares C.,University of Lisbon
International Journal of Fatigue | Year: 2017

Fatigue crack propagation in bulb stiffeners, which are widely used in ship and bridge structures, is one of the basic problems for structures’ fatigue life prediction. This paper proposes a method to calculate the fatigue crack propagation in bulbs, which provides a method for defining the failure criterion for bulb stiffeners. The shape of a three dimensional surface crack in a full-scale bulb stiffener fatigue test was measured and estimated by the Nominalization Crack Opening Displacement method. Then the obtained crack shape was used to predict the fatigue crack propagation in the bulb stiffener based on the two dimensional Paris’ law and the Linear Finite Element Analysis method. Moreover, the predicted fatigue crack propagation has been verified by the full-scale fatigue test on a typical ship structure detail. © 2017 Elsevier Ltd

Hu C.,Wuhan University of Technology | Hou D.,Qingdao Technological University | Li Z.,Hong Kong University of Science and Technology
Cement and Concrete Composites | Year: 2017

To investigate the micro-mechanical properties of calcium sulfoaluminate cement and the correlation with the microstructures, we apply a variety of advanced techniques of microstructural and micro-mechanical characterization, including scanning electron microscopy with backscattered electron and energy-dispersive X-ray spectroscopy detectors, X-ray fluorescence, X-ray diffraction and nanoindentation. For the first time, the micro-mechanical properties of material microstructures present in a calcium sulfoaluminate cement are estimated. In the calcium sulfoaluminate cement used in this research, two type of hydration product microstructures with the differentiable microstructural morphologies, compositions and micro-mechanical properties are identified and investigated. The correlation of the micro-mechanical properties with the microstructures shows that the hydration product microstructure containing more ettringite has lower indentation modulus and hardness than that containing more aluminum hydroxide. © 2017 Elsevier Ltd

Hu Z.,Wuhan University of Technology | Su Y.,Wuhan University of Technology
Proceedings - 2016 31st Youth Academic Annual Conference of Chinese Association of Automation, YAC 2016 | Year: 2016

The MEMS inertial measurement system can not perform the initial self-alignment due to the low measurement precision of MEMS gyro. To solve this problem, an initial alignment method assisted by magnetometers is proposed in this paper. Measurement values of MEMS inertial devices and the heading angle are fused to estimate state variables by using unscented Kalman filtering. Error equations of the MEMS inertial measurement system are modified to satisfy the unscented Kalman filtering model in this paper. Simulation results show that the initial alignment method proposed in this paper satisfies the requirement of the MEMS inertial measurement system which is used in low and medium precision field. © 2016 IEEE.

Ma L.,Wuhan University of Technology | Chen Q.,Wuhan University of Technology
Proceedings - 2016 31st Youth Academic Annual Conference of Chinese Association of Automation, YAC 2016 | Year: 2016

If parameters of three-phase inverters in parallel are different, there will be circulation current between the parallel inverters. Circulation current leads to the increase of energy loss, reduction of efficiency, and distortion of the inverter output voltage and current waveform. This paper researches the improved circulation current control strategy and load sharing control strategy to suppress the circulation current based on space vector pulse width modulation (SVPWM) algorithm. The control strategies not only have good performance on suppressing circulation current and load sharing, but also significantly improve quality of output voltage and current of inverters. The strategies are verified by simulation. © 2016 IEEE.

Liang Y.,Wuhan University of Technology | Huang J.,Wuhan University of Technology
PLoS ONE | Year: 2017

Spatio-temporal integrated assessment of land-use change impacts on carbon storage services is a new and important research field in land science and landscape ecology. The objective of this paper is to use an integrated SD-CLUE-S and InVEST model to simulate and predict land-use changes impacts during 2000-2018 on carbon storage at pixel and regional scales in the Zhangye oasis, Northwest China. The SD-CLUE-S model was used to simulate land-use change, and three land-use scenarios (current trend, moderate protection, and strict protection) were defined in collaboration with oasis socioeconomic development and ecological environment conservation by local government. The InVEST model was then used to simulate land-use change impacts on carbon storage at different scales in the oasis. The results showed that: (1) the effects of built-up land expansion were especially notable, with a rapid decrease in cropland during 2009-2018; (2) the strict protection scenario saved the largest amount of carbon storage for the oasis compared with the current trend and moderate protection scenarios. The scientific value of this study has been to show that the proposed modeling method can be used to reflect different land-use patterns and their effects on ecosystem services at multiple scales in the oasis. Furthermore, this research can be used to help government managers encourage stakeholders to contribute funds and strategies to maintain oasis landscape patterns and ecological processes by implementing local plans for potential conservation projects. © 2017 Liang et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Liu Q.,Wuhan University of Technology | Liu L.,Wuhan University of Technology | Xiao W.,Nuclear Power Institute of China
ChemPhysChem | Year: 2017

NO adsorption on n-type and p-type modified anatase (101) surfaces is studied by using first-principles calculations. Both types of modifications can facilitate the adsorption of a NO molecule on an anatase (101) surface. The adsorption mechanisms for these two types of adsorption are different. On n-type modified surfaces, the Natom of the NO molecule is bonded to a surface Ti5C ion, that is, the unpaired electron on the π*orbital of the NO molecule forms a bond with an extra 3d electron of the surface Tiion. On p-type modified surfaces, the Natom of the NO molecule is bonded to surface O2C. The unpaired electron of the NO molecule fills the empty 2porbital of the modified surface, and the π*orbital of the NO molecule hybridizes with the surface valence band. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Liu Y.,Wuhan University of Technology | Wang F.,Hubei Urban Construction Vocational and Technological College
Advances in Intelligent Systems and Computing | Year: 2017

The technology of VR (Virtual Reality) is the result of the progress of science and technology since the 20th century, it embodied the computer technology, computer graphics, multimedia technology, sensor technology, display technology, human body engineering, human-computer interaction theory, the latest achievements of artificial intelligence, and other fields, has become the latest achievements after relay information field of multimedia technology and network technology is widely attention and research, development and application of hot spots, is currently the fastest growing a multi-disciplinary comprehensive technology. Rapid generating equipment and interaction changed in the past, between people and computer dull, stiff, passive way of communication, make the man-machine interaction between become more humanized, blazed a new research field of human-computer interaction interface, which provides a new interface for the application of intelligent engineering tools, for all kinds of engineering provides a new description method of large-scale data visualization, but also changed the way people work and lifestyle and ideology. © Springer International Publishing Switzerland 2017.

Li C.,Wuhan University of Technology | Zhang J.,Wuhan University of Technology
Journal of Network and Computer Applications | Year: 2017

In recent years, Storm, an open source distributed real-time computation system, has gained significant amount of popularity in cloud computing industry due to its high reliability and good processing mode. The key in tuning Storm performance lie in the strategy deployed a topology on Storm cluster and the scheduling method used in Storm scheduler. A Storm topology refers to a graph of real-time computation, which provides the logic view of the data process. Currently, Storm adopts a static topology deployment strategy and a simplistic scheduling method, which not only limits flexibility in topology tuning, but also leads to low efficiency in load balancing among its worker nodes. To this end, a Storm topology dynamic optimization algorithm based on the theory of constraints (STDO-TOC) is proposed to dynamically eliminate the performance bottleneck of the topology. In addition, a real-time scheduling algorithm based on topology and traffic (TS-Storm) is proposed to effectively solve the problem of inter-node load imbalance. Extensive experiment results show that, our newly proposed topology deployment strategy and scheduling method can largely improve performance of Storm in term of better system throughput, shorter average delay and latency, and less inter-node traffic. © 2017 Elsevier Ltd

Wang C.,Wuhan University of Technology | Wang W.,Wuhan University of Technology
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

In recent years, endovascular interventions have developed rapidly with expected to contribute to improve traditional vascular surgery in the aspects of recovery time and patient safety. Therefore, tracking an accurate position of the guide wire in the coronary artery has become an important area. This paper proposes a guide wire tracking algorithm based on OAC (Open Active Contours). The method focuses on improving the accuracy of guide wires tracking in a single frame and the speed of the extraction of the position of guide wire. In image processing procedures, we integrate a multiscale-filter for vessel's image enhancement, a method of OAC based on edge detection for initializing the vessel's image and an algorithm for deforming and control of curves. A standard analysis is used to evaluate this method in the last part of this paper. And the results show that the accuracy rate is 95.3% from the clinical images. © 2016 IEEE.

Zha G.-F.,Wuhan University of Technology | Qin H.-L.,Wuhan University of Technology | Kantchev E.A.B.,Hefei University of Technology
Organic and Biomolecular Chemistry | Year: 2017

Atropisomeric biaryl disulfoxides contain two independent chiral elements. Previously, the (M,S,S)-diastereomer showed very high catalytic activity and selectivity in the Rh-catalyzed asymmetric 1,4-addition of arylboronic acids to α,β-enones whereas the (M,R,R) counterpart-none. Herein, DFT computations on the key transmetallation (turnover-determining) and carborhodation (enantioselectivity-determining) steps of the catalytic cycle show that the (M,S,S)-ligand gives rise to lower reaction barriers for these elementary steps. However, the barriers for the (M,R,R)-ligand are not sufficiently high to explain the lack of reactivity. Hence, this phenomenon is most likely due to the failure of catalyst formation from the ligand and the dimeric Rh precatalyst complex. The hitherto unknown (M,S,R)-ligand shows predicted enantioselectivity similar to the (M,S,S)-ligand as a consequence of lower reaction barriers associated with those isomers whose key features resemble the (M,S,S)-ligand. © The Royal Society of Chemistry.

Deng S.,Wuhan University of Technology | Zeng D.,Wuhan University of Technology
Environmental Science and Pollution Research | Year: 2017

The aim of this study was to investigate the removal of phenanthrene by combination of alfalfa, white-rot fungus, and earthworms in soil. A 60-day experiment was conducted. Inoculation with earthworms and/or white-rot fungus increased alfalfa biomass and phenanthrene accumulation in alfalfa. However, inoculations of alfalfa and white-rot fungus can significantly decrease the accumulation of phenanthrene in earthworms. The removal rates for phenanthrene in soil were 33, 48, 66, 74, 85, and 93% under treatments control, only earthworms, only alfalfa, earthworms + alfalfa, alfalfa + white-rot fungus, and alfalfa + earthworms + white-rot fungus, respectively. The present study demonstrated that the combination of alfalfa, earthworms, and white-rot fungus is an effective way to remove phenanthrene in the soil. The removal is mainly via stimulating both microbial development and soil enzyme activity. © 2017 Springer-Verlag Berlin Heidelberg

Liu L.,Wuhan University of Technology
Proceedings - 2016 International Conference on Smart City and Systems Engineering, ICSCSE 2016 | Year: 2016

English teaching platform is established based on the MOOC with the focus on learning database construction for the non-English major students in colleges. The platform could be divided into five systems such as independent learning system, resource management system, teaching management system, evaluation feedback system and certification system. This model focused on study and online autonomous learning function. The experimental results prove the validity and feasibility of teaching model based on network MOOC. The proposed teaching model would help to enhance the students' learning enthusiasm and improve their English practical ability if it is applied in English teaching properly. © 2016 IEEE.

Zhou H.,Wuhan University of Technology | Huang J.,Wuhan University of Technology | Yuan Y.,Wuhan University of Technology
Water Resources Management | Year: 2017

The spatial characteristics and the high-duty water regions of the Water Usage Patterns (WUP) are very important for the allocation and management of water resources. Taken Hubei province, China as an example, we adopted the exploratory spatial data analysis (ESDA) method to investigate the spatial dependence and local patterns of the WUP from 2003 to 2012. Subsequently, the spatial variation mechanisms were analyzed through the gravity center model. The results indicated that the overall spatial dependence of the agricultural WUP was detected (more significant after 2008). Moreover, the global spatial autocorrelation analysis results on the domestic WUP showed statistical significance (Moran’s I > 0.1, P < 0.05). These indicated that the local patterns were presented. The high values clustering areas of the agricultural and domestic WUP were mainly distributed in the central province and in the western province respectively. However, the approximate random distribution was identified for the industrial WUP because the industrial development had been conducted widely in the whole province during these years. Furthermore, the governmental policies and natural environment contributed to the spatial evolution tendency of the WUP. An increasing trend of the spatial association of the agricultural WUP and a significant decreasing trend of that of the domestic WUP, which suggested that the natural circumstance superiority and the industrial structure adjustment related to water utilization has been utilized and implemented effectively. This study can provide a useful reference and guidance for scientific planning of water resource systems. © 2017, Springer Science+Business Media Dordrecht.

Wang J.,Wuhan University of Technology
Revista de la Facultad de Ingenieria | Year: 2017

Supply chain finance has become a new type of financing model provided by commercial banks. This paper first analyzes the development status of the supply chain finance business in commercial banks. In the analysis of the risk management on the supply chain finance in commercial banks, this paper applies the group decision theory and the triangular fuzzy number in the risk evaluation and proposes a fuzzy group decision-making evaluation model to measure the supply chain finance business in commercial banks based thereon, and then uses an example to test the applicability of the model. At last, this paper puts forward suggestions on risk management.

Chen C.,Wuhan University of Technology | Xia Y.,Wuhan University of Technology | Bowa V.M.,Wuhan University of Technology
Computers and Geotechnics | Year: 2017

In this paper, a polar slice method is proposed to quantify the energy dissipation in the inner sliding soil mass and evaluate the slope stability in rotational failure mechanism. The polar slice method is compared with the vertical slice method. Despite similar results, the advantages of the polar slice method are explained. Besides, the comparison between the polar slice method and Chen's method shows that the polar slice method would lead to more accurate results than Chen's method, while Chen's method which neglects the energy dissipation in the inner sliding soil mass is relatively conservative. © 2016 Elsevier Ltd

He S.,Wuhan University of Technology | Chen X.,Wuhan University of Technology
Journal of Non-Crystalline Solids | Year: 2017

Methyltrimethoxysilane (MTMS) based silica aerogels with excellent mechanical properties have been synthesized through sol-gel process under ambient pressure drying. The effect of water/ethanol mixed solvent system on the mechanical properties of silica aerogels was studied. The surfactant was used to promote the mixing of the MTMS-derived species and water in solvent. Low ethanol in the solvent system helps to form nano-scale and uniformly distributed pore and particle structure. And the increasing EtOH caused large clusters to microns in size. Surface modification makes sure that more methyl groups attached on the particle surface which repels each other when pressed. Low EtOH in the solvent system and surface modification results in higher reversible shrinkage and Young's Modulus. © 2017 Elsevier B.V.

Zu Q.,Beijing Jiaotong University | Tang X.-Z.,Beijing Jiaotong University | Xu S.,Wuhan University of Technology | Guo Y.-F.,Beijing Jiaotong University
Acta Materialia | Year: 2017

The formation of the basal/prismatic (BP) interfaces during nucleation and growth of a reoriented crystal in Mg single crystals under c-axis tension is investigated by molecular dynamics simulations. The BP interfaces nucleate by a shuffling mechanism via local atomic rearrangement. Both two-layer disconnection and one-layer disconnection contribute to the migration of the BP interfaces. The three-dimensional analysis reveals that the two-layer disconnection forms at the junction between the partial pyramidal dislocation and BP interface. The BP interfacial disconnections prefer to move towards the [12¯10] direction rather than the [1¯010]/[0001] direction due to the accumulation of mismatches along the [1¯010]/[0001] direction. Moreover, the BP interface can transform to the {101¯2} twin boundary and vice versa. The transformation from a BP interface to a twin boundary occurs through the diagonal pile-up of BP interface disconnections, and the reverse transformation involves an upright pile-up process. Both BP transformation and {101¯2} twinning can effectively accommodate the applied tensile strain along the c-axis. The co-existing BP interfaces and {101¯2} twin boundaries allow for large deviations of a twin interface from the {101¯2} twin plane. © 2017 Acta Materialia Inc.

Yi P.-P.,Wuhan University of Technology | Niu S.-K.,Changjiang Survey Planning Design and Research Co.
Civil Engineering and Urban Planning IV - Proceedings of the 4th International Conference on Civil Engineering and Urban Planning, CEUP 2015 | Year: 2016

In this paper, we present a new method to determine unsaturated soil hydraulic parameters. First, we carried out one-step outflow test to observe the curves of outflow with time. Then, the HYDRUS-1D water transport model was merged to obtain the curve parameters. Finally, the parameters were used to determine the soil-water characteristic curve and the hydraulic conductivity function. By comparing the measured data, it was shown that the difference between the estimated and measured values of soil-water characteristic curves was small. In addition, compared with traditional methods, the method can save a lot of time. © 2016 Taylor & Francis Group, London.

Wang Y.,Wuhan University of Technology | Yuan Y.,Wuhan University of Technology
CGNCC 2016 - 2016 IEEE Chinese Guidance, Navigation and Control Conference | Year: 2016

Due to the low PF (Power Factor, PF) of high-power and high-voltage electronic motor, the reactive power consumed during the soft starting period and the operating period are different. This paper proposes a dynamic reactive power compensation method for high-power and high-voltage electronic motors based on self-adaptive fuzzy PID control to stabilize power grid voltage and reduce energy consumption. The following results were achieved: (1) developed a topology structure of a dynamic reactive power compensation device for high-power and high-voltage electronic motors; (2) investigated the control theory of a dynamic reactive power compensation system for high-power and high-voltage electronic motors; (3) proposed a regulation algorithm to calculate the equivalent inductance of VIL (Variable Inductance Load, VIL), L based on the self-adaptive fuzzy PID control. The proposed method was deployed by Da Yu Electric Ltd. To develop soft-start devices according to the soft starting demand for the 10 kV, 21000 kW blower load in a steel-manufacturing plant. Current and reactive power compensations were limited during the process of starting the motor, and reactive power compensation was limited after soft starting. In this way, the overall starting performance of high-power and high-voltage electronic motors was improved, energy consumption was reduced, and the power grid voltage was stabilized. © 2016 IEEE.

Lei F.,Wuhan University of Technology | Deng Y.,Wuhan University of Technology
Hydraulic Engineering IV - Proceedings of the 4th International Technical Conference on Hydraulic Engineering, CHE 2016 | Year: 2016

The dynamic response of underwater structures is different from those in air because of interaction between fluid and solid. With a lot of actual examples of deep-water bridges, the dynamic characteristics of rectangular bridge pier in deep water are analyzed on the basis of potential fluid theory. The dynamic response influence of rectangular pier with different depth of water is discussed, under the action of harmonic loads. © 2016 Taylor & Francis Group, London, UK.

Liu J.,Wuhan University of Technology | Liu J.,Huaibei Normal University
Journal of Alloys and Compounds | Year: 2016

Graphitic carbon nitride (g-C3N4), as a promising visible-light photocatalyst, has wide applications on water splitting, pollutants decomposition and CO2 reduction. Herein, we investigated the electronic and optical property of pure and P doped g-C3N4 using Heyd-Scuseria-Ernzerhof (HSE06) hybrid functional method. The valuable features such as, the band structure, density of states, band decomposed charged density and optical absorption were computed to explore the role of phosphorus substitute N2 and C1 sites of g-C3N4.The results indicated that pure g-C3N4 has an indirect band gap of about 2.73 eV, which is in good agreement with the experimental value. By doping P into N2 and C1 sites of g-C3N4, the band gap reduces to 2.03 and 2.22 eV, respectively. Optical absorption intensity of g-C3N4 had a greatly enhancement in the visible region by doping P. Though narrowing the energy band of g-C3N4 by doping P, conduction band and valance band edge of g-C3N4 doping system still had enough potential to split water. Therefore, phosphorus doped g-C3N4 is effective strategy to improve visible light response photocatalytic performance of g-C3N4. © 2016 Elsevier B.V.

Ding A.,Wuhan University of Technology | Li S.,Wuhan University of Technology | Li S.,University of Bristol | Wang J.,Wuhan University of Technology | And 2 more authors.
Composites Part A: Applied Science and Manufacturing | Year: 2017

This paper presents a more general numerical path-dependent constitutive model for cure-induced distortions and residual stress analysis of orthotropic composite structures as compared to the path-dependent model presented by Svanberg and Holmberg (2004). The model is derived based on a limiting case that the shift factor or equivalent relaxation time is approximated as zero in the rubbery state and infinity in the glassy state in the linear orthotropic Thermo-rheologically Complex Materials (TCMs) viscoelastic constitutive model. The temperature dependent factor is incorporated into the rubbery and glassy state stiffness, which allows prediction of temperature dependent behaviour of composite structures in different material states during curing. The other important mechanisms, e.g. thermal expansion in different material states, chemical shrinkage and frozen-in distortion are also involved in the new path-dependent constitutive model to accurately predict the cure-induced distortions and residual stress in the composite structures. Furthermore, this new model is implemented into ABAQUS as subroutines and is validated by a good agreement between numerical results and analytical calculations for two numerical examples. © 2016 Elsevier Ltd

Pan J.,Wuhan University of Technology | Li S.,Jilin railway investment and development Co.
Optics InfoBase Conference Papers | Year: 2016

An FBG strain gauge with sensitizing method is used to monitor railway switch resistance. An on-line monitoring system was built at a Metro station. This method monitors health state of the switches in long-term service. © OSA 2016.

Liu J.,Zhongnan University of Economics and Law | Xie K.,Wuhan University of Technology
Kybernetes | Year: 2017

Purpose: While scheduling and transporting emergency materials in disasters, the emergency materials and delivery vehicles are arriving at the distributing center constantly. Meanwhile, the information of the disaster reported to the government is updating continuously. Therefore, this paper aims to propose an approach to help the government make a transportation plan of vehicles in response to the disasters addressing the problem of material demand and vehicle amount continual alteration. Design/methodology/approach: After elaborating the features and process of the emergency materials transportation, this paper proposes an emergency materials scheduling model in the case of material demand and vehicle amount continual alteration. To solve this model, the paper provides the vehicle transportation route allocation algorithm based on dynamic programming and the disaster area supply sequence self-learning algorithm based on ant colony optimization. Afterwards, the paper uses the model and the solution approach to computing the optimal transportation scheme of the food supply in Lushan earthquake in China. Findings: The case study shows that the model and the solution approach proposed by this paper are valuable to make the emergency materials transportation scheme precise and efficient. The problem of material demand and vehicle amount changing continually during the process of the emergency materials transportation is solved promptly. Originality/value: The model proposed by this paper improves the existing similar models in the following aspects: the model and the solution approach can not only solve the emergency materials transportation problem in the condition of varying demand and vehicle amount but also save much computing time; and the assumptions of this model are consistent with the actual situation of the emergency relief in disasters so that the model has a broad scope of application. © 2017, © Emerald Publishing Limited.

Wang Y.,Wuhan University of Technology | Wang Y.,University of Pittsburgh | Gong X.,Wuhan University of Technology
Journal of Materials Chemistry A | Year: 2017

An oleophobic and hydrophilic surface is a surface that is more wettable to water than to oil. In recent years, this novel surface has attracted significant attention since it is highly desirable in many important applications such as long-term anti-fogging, detergent-free cleaning, and oil and water separation. In this study, we focused on recent advances in oleophobic and hydrophilic surfaces. We briefly summarized three approaches, including simultaneously oleophobic/hydrophilic behavior, oleophobic/hydrophobic to hydrophilic switching behavior, and hydrophilic/underwater superoleophobic behavior, to achieve this surface. Moreover, we discussed the underlying mechanisms and the potential applications of this surface have also been introduced. © The Royal Society of Chemistry.

Lei D.,Wuhan University of Technology | Zhou S.,Wuhan University of Technology
CIE 2016: 46th International Conferences on Computers and Industrial Engineering | Year: 2016

In this study fJSP with the minimization of total energy consumption and maximum workload is considered and a novel shuffled frog-leaping algorithm (SFLA) is proposed based on a three-string coding method. Memeplexes are constructed by using population and non-dominated set according to tournament selection. The search process of each memeplex is done on its nondominated member. Extensive experiments are conducted to test the search performance of SFLA and the results show the conflicting between two objectives of fJSP and the promising advantages of SFLA on the considered fJSP.

Xu F.,Wuhan University of Technology
Proceedings - 2016 International Conference on Robots and Intelligent System, ICRIS 2016 | Year: 2016

Harmonic suppression is of great practical significance. This paper first outlines the generation and harm of the electrical harmonic in the coal industry buildings. Then it discusses the equipment of harmonic suppression. Finally, it discusses the application of harmonic suppression technology in the electrical design of coal industry buildings, including reasonable DSP programming for harmonic current detecting; positive management of the harmonic source; adopting a filter circuit on the outside of the frequency converter; reasonable electrical designs of industrial buildings and active establishment of online monitoring system of the power quality. © 2016 IEEE.

Geng H.,Hubei Urban Construction Vocational and Technological College | Li Q.,Wuhan University of Technology
Key Engineering Materials | Year: 2017

The compressive strength, water absorption and hydration products of mortar with metakaolin addition were characterized by a range of techniques to evaluate the effect of metakaolin on the properties and hydration of mortar. Metakaolin is more effective on the improvement of compressive strength of mortar after curing for 7 days, due to the refinement of pore structure and pozzolanic reaction between metakaolin and calcium hydroxide. Water absorption of mortar was reduced by introducing metakaolin, especially in the very early age, due to the optimization of packing density of mortar by superfine metakaolin particles. There is no correlation between compressive strength and water absorption of mortar due to the differences between mechanisms affecting the compressive strength and water absorption of mortar by metakaolin. The hydration products of mortar without metakaolin were Portlandite and ettringite. Additional hemicarboaluminate and monocarboaluminate were identified in mortar with metakaolin addition. Metakaolin addition reduced the calcium hydroxide content due to the pozzolanic reaction. © 2017 Trans Tech Publications, Switzerland.

Zou H.,Wuhan University of Technology
Proceedings - 12th International Conference on Computational Intelligence and Security, CIS 2016 | Year: 2016

As a production factor, big data is being intensively integrated with the development of various industries. The consequent security issues concerning personal information are becoming increasingly severe. This article aims to analyze the major issues which arise with big data, including the breach of personal information, the potential security risks and the users' reduced personal information control rights. It is followed by the analysis of their causes: users' weak awareness of information security, the under-developed laws and regulations concerning the security of personal information, the laggard technology for security maintenance of big data, and motivations for profits. In order to solve these problems, firstly, the awareness of information security and users' ability of security maintenance should be strengthened. In addition, the security management system of big data should be improved with deepening reform of security technology. Furthermore, legislation and regulation system should be reinforced. Lastly, standardized codes of practice and self-discipline pact of the industry should be reinforced to ensure the security of personal information in the age of big data. © 2016 IEEE.

Li Y.,University of Tennessee at Knoxville | Liu Y.,Wuhan University of Technology | Chen G.,University of Tennessee at Knoxville
Biochimie | Year: 2017

Xiao L.,Wuhan University of Technology | Xiao L.,Wuhan Institute of Technology | Wei X.,Huazhong University of Science and Technology
Materials and Structures/Materiaux et Constructions | Year: 2017

Specimens of fresh paste, mortar and concrete with W/C ratios of 0.30, 0.35, 0.40, 0.45, 0.50 and 0.55 were prepared to monitor electrical resistivity for a period of 24 h from casting using non-contact electrical resistivity measurement. A general equation ρ(t)=KP(1-Va)-mln(Dt) was obtained from the electrical resistivity development of the mixtures during the decelerating period of the hydration process, and the physical meanings of the parameters in the general equation were identified. The densification rate of the hydration system was obtained from the slope of electrical resistivity development with time, and the hydration rate of each cement particle in unit volume of the cement paste matrix was identified. The influence of aggregate and W/C on the parameters was analyzed. The same aggregate volume fraction was used in all of the mortar and concrete samples. A mortar sample has a faster densification rate than that of a concrete sample at each W/C due to the higher specific surface area of the total aggregate particles in the mortar, resulting in a higher tortuosity for the ions migration. The very close D values of the pastes, the mortars and the concretes with the same W/C, and the slightly increasing trend with W/C, present the characteristics of the hydration rate of each cement particle in unit volume of the cement paste matrix. Mixtures with lower W/C have higher densification rates, and the quantitative relationships were obtained for the paste, mortar and concrete samples, respectively. The densification rate of a mixture can be used as an index for deriving its W/C based on the quantitative relationship obtained from electrical resistivity measurement. The densification rate of a hydration system and the hydration rate of each cement particle in the hydration system, as important hydration parameters, can help to reveal the hydration kinetics that are correlated with hardening properties of concrete. © 2016, RILEM.

Luo L.,Wuhan University of Technology | Luo L.,University of Queensland | Nguyen A.V.,University of Queensland
Separation and Purification Technology | Year: 2017

Magnetic separation has been used in industries to concentrate or remove magnetic minerals/particles for many years. The separation of ultrafine magnetic particles is significantly influenced by aggregation between particles due to various external and interparticle forces, such as gravity, magnetic attraction, van der Waals, electrical double-layer, hydrodynamic, and Brownian diffusion forces. This review focuses on the principles of the magnetic flocculation and separation of micrometer-sized particles in solution. Potential energies between particles are linked to the particle aggregation (i.e. stability), sedimentation and dispersion in applied magnetic fields. Prediction and control of magnetic flocculation are achieved by simulating particle motions around the surface of the magnetic separators using various mathematical models, with some large-scale applications of magnetic flocculation are being demonstrated. © 2016 Elsevier B.V.

Pan Z.-X.,Wuhan University of Technology | Wang M.,Yantai Vocational College
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

An optimization object detection method based on color image symmetrical frame-difference is proposed in order to solve the problem of motion multi-object detection difficult under complex environment. In this paper, firstly the color images distance is defined to calculate the frame-difference between two adjacent images. Then the before and after symmetrical image-distance of three adjacent images in difference frame interval step can be completed respectively. Secondly, an optimization binary method is designed to extract more object pixels. And the before and after object binary results of the adjacent images with the same middle (key frame) image are given respectively. At last, motion multi-object of the key frame image is achieved by the fusion result of logical AND between the before and after object binary results depending on three-frame-adjacent images with the same key frame. Actual color images from traffic surveillance system are used to test, the experimental result shows that the optimization object detection algorithm based on symmetrical frame difference in the proper step can extract motion multi-objects in different movement speed under complex environment and its accuracy and effectiveness of the proposed algorithm are verified. © 2016 IEEE.

Fu J.,Wuhan University of Technology | Wei D.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

Nowadays, endowing robots with the capability to learn is an important goal for the robotics research community. An important part of this research is learning skills. Dynamic movement primitives (DMPs) is a very powerful model to conduct learning from demonstration for robot. In this paper, we have made a great improvement on Local weighted Regression(LWR) which is an original regression technique in DMPs. Specifically, we change the phase from integrating into time average and give an logistic function to make sure the final forcing term to be zero. Then, we can make better use of min-jerk criterion demonstrate the effect and efficient. © 2016 IEEE.

Song Y.,Wuhan University of Technology | Xie K.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

The casualties caused by emergencies increased rapidly in recent years, more and more scholars began to make an intensive study of this field. From the subjective judgment to objective measurement it is a new attempt to use the visualization software to study the knowledge base, development context and recent research with the downloaded data from the database such as 'Web of Science'. Based on the analysis software CiteSpace, this paper studies the mapping knowledge of the countries, institutions, categories and keywords, divides the keywords into 10 clusters which can be separated into the micro and macro aspects and obtains the researching trends of the crowd behavior in emergencies. © 2016 IEEE.

Jiang J.,Wuhan University of Technology | Xiao C.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

The particle size analysis of rock particle image has a wide application in practice. However, there is a challenge to extract complex particle size information because of the mutual adhesion among the particles. Fuzzy c-means clustering(FCM) algorithm can segment image by multiple eigenvalues of image, but it's difficult to determine C the number of sample set of clustering and m the fuzzy weighting exponent. So this paper proposes the method consisted of adaptive fuzzy c-means clustering(AFCM) algorithm and the watershed algorithm which can effectively make up the weakness of AFCM algorithm in segmenting conglutinate objects. At the same time the method can prevent the over segmentation of the image caused by the watershed algorithm. The method, firstly, carries on median filter to the image, next, does the AFCM clustering to the image, and then carries on the watershed processing to the image, and gets the satisfactory segmentation image. Finally, counts the number of particles, calculates single particle pixel, and meanwhile make a statistic of the same pixel area and classify them. Upon completion of all of the above, the particle size of the rock particle image is analyzed commendably. © 2016 IEEE.

Sun S.,Wuhan University of Technology | Guo X.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

In view of the low illumination color images, image enhancement technology is commonly used in image processing. In this study, we propose a brightness enhancement algorithm based on the bright channel prior, which focuses on the gray removal. The local patches in sufficient illumination images contain some pixels that have very high intensities in at least one color channel. Using this prior with haze imaging model, image enhancement can be achieved. The experimental results showed that the algorithm had good visual effect in image enhancement. © 2016 IEEE.

Ke Z.,Wuhan University of Technology | Xiao C.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

This paper introduces a wireless street light control system based on ZigBee network. It realizes on/off control, power adjustment and fault monitoring with applying ZigBee wireless technology. The system gets the street lights parameters and realizes remote monitoring through ZigBee and GPRS wireless communication. Install the single control terminal on street light to achieve data acquisition and power adjustment. Concentrator is regarded as a repeater, it plays the role of a bridge between street light control terminals and monitoring center. It completes forwarding the data and command. The system saves the lighting energy consumption, and material resources. The Control measure of the system is simple and convenient. The system has a broad market. © 2016 IEEE.

Xianting Q.,Wuhan University of Technology | Pan W.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

The dsensity-based spatial clustering of applications with noise (DBSCAN) is a kind of the density-based representative algorithms. It has been widely used in more and more fields due to its ability to detect clusters of different sizes and shapes. However, the algorithm becomes unstable when dealing with the high dimensional data. To solve the problem, an improved DBSCAN algorithm based on feature selection (FS-DBSCAN) is proposed. The performance of this algorithm is testified by a series of simulations on real world datasets. Comparisons with the DBSCAN algorithm demonstrate the superiority of the proposed algorithm. © 2016 IEEE.

Ding A.,Wuhan University of Technology | Zhou X.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

Focused on the issue that conventional land-use classification methods can't reach better performance, a new remote sensing image classification method based on Stacked Autoencoder inspired by deep learning was proposed. Firstly, the deep network model was built through the stacked layers of Autoencoder, then the unsupervised Greedy layer-wise training algorithm was used to train each layer in turn for more robust expressing, characteristics were learnt supervised by Back Propagation neural network and the whole net was optimized by using error back propagation. Finally, GF-1 remote sensing data were used for evaluation and the total accuracy and kappa accuracy which were higher than that of Support Vector Machine and Back Propagation neural network reached 95.5% and 95.3% respectively. The experiment results show that the proposed method can effectively improve the accuracy of land cover classification. © 2016 IEEE.

Fu J.,Wuhan University of Technology | Chen S.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

Learning from demonstration has been applied successfully in acquiring similar motor skills for robot. However, how to accomplish different tasks with no explicit demonstration is still a challenging issue. In this paper, we propose a novel robot skills learning method consisted of Dynamical Movement Primitives with mixture Gaussian Model Regression(DMPS-GMR) and Policy Improvement with Path Integrals (PI2). The DMPS-GMR make the robot have the ability of learning fundamental task from the rough demonstration, and then Policy Improvement with Path Integrals based on GMR (PI2-GMR) endow robot the optimal/suboptimal solution for dissimilar task from the imitated state gain from DMPS-GMR. Experimental results demonstrate that the proposed approach can make robot acquisition skill more accurately. © 2016 IEEE.

Xiao C.,Wuhan University of Technology | Fang Z.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

With the rapid development of city construction, the health of bridge whether on land or water has a direct impact on the local transportation, economic and social life, a long-term monitoring on the bridge structure is particularly important. In this paper, in view of the structure of a bridge in Wuhan, and the monitoring system requirements, the technology based on Kalman filter of multi-sensor information fusion was used to analyze the data of bridge structure and timely know the safety of bridge structure. In consideration of the possible sensor fault in the monitoring process, the sensor fault detection method based on correlation information entropy is used to monitor the status of the sensor. The monitoring system which use the multi sensor information fusion algorithm with sensor fault diagnosis realizes the data collection, analysis and storage, due to the sensor fault diagnosis, the data can be reliable and accurate, so as to provide a scientific basis for the evaluation of the safety factor of the bridge structure and the maintenance of the bridge. © 2016 IEEE.

Xiao C.,Wuhan University of Technology | Wang W.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

In this paper, a crack detection method of crystal stone is proposed. Firstly, the dilation operator and Laplacian operator characteristics are analyzed. The dilation process is approximated as convolution process. A new operator is superimposed by Laplacian operator and dilation structural operator. Image information is processed based on the new operator. Noise, dark spots and oil stains are removed and crack becomes more clearer. Simulation results show effectiveness of the operator. The method satisfies detection requirements of the production process. © 2016 IEEE.

Ding Z.,Wuhan University of Technology | Guo J.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

In order to effectively prevent direct and indirect losses the lightning disasters bring to coastal ports and guarantee the security of production, this paper proposes to establish a lightning forecast system of ports based on cloud technology, which includes three functions, such as collecting underlying lightning data, analyzing and predicting based on cloud big data technology and pushing warning information. This platform can fully and effectively collect the lightning raw data, and upload these data to storage resource pool, and then use distributed computing for lightning location algorithm and multi-level threshold judgments. Once lightning warning signal generates, it will be pushed to mobile terminals immediately for people to start lightning protection plans in advance, to keep the safety of work and reduce the equipment damages caused by lightning. © 2016 IEEE.

Xi W.,Wuhan University of Technology | Ling L.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

As IoT being gradually applied, people's life is becoming more and more convenient. However, when people enjoy those convenience brought by the IoT, there also be some certain risks of privacy security. How to ensure that convenience, and reduce the risks at the same time, which seems to be a long-term work. From this perspective, the paper studied the causes of privacy security risks, and put forward some relevant IoT risk prevention methods. These research results have some certain practicabilities, which would provide an important theoretical reference value in the field of scientific research and engineering. © 2016 IEEE.

Zheng Y.,Wuhan University of Technology | Jiang C.,Wuhan University of Technology
Proceedings - 2016 International Conference on Industrial Informatics - Computing Technology, Intelligent Technology, Industrial Information Integration, ICIICII 2016 | Year: 2016

With the development of the internet, live online platforms have attracted a wider audience. In this paper, we are going to focus on Live Online Platforms and investigatefactors which have a significant effect on their users'intention. For this purpose, we combined the uses and gratifications theory, technology acceptance model and media richness theory to provide a new model. Meanwhile, we analyzed impact factors on live online platform users' intention from three aspects: user perception factor, user requirement factor and content factor. We studied DouYu TV live online platform as the case and conducted a survey to collect data from two hundred and twenty users. SPSS and LISREL also were applied for analyzing the data and testing the model. The result of this research can be utilized in improving user satisfaction and attracting more users by live online platform developers and operators. © 2016 IEEE.

Xia J.,Wuhan University of Technology | Jiang L.,CAS Technical Institute of Physics and Chemistry
Nano Research | Year: 2017

The cooperative interaction distance measure has been proposed as a novel law pertaining to dialectics of nature, and has been extensively carried out in the design of functional nanomaterials. However, the temporal and spatial dimensions are akin to yin and yang, and thus temporal regulation needs to be accounted for when implementing the above-mentioned principle. Here, we summarize recent advances in temporally and spatially regulated materials and devices. We showcase the temporal regulation of organic semiconductors for organic photovoltaics (OPVs) using the example of exciton lifetime manipulation. As an example of spatial regulation, we consider the distribution of charge carriers in core–shell quantum dot (QD) nanocrystals for modulating their optical properties. Long exciton lifetime can in principle increase the exciton diffussion length, which is desiable for high-efficiency large-area OPV devices. Spatially regulated QDs are highly valuable emitters for light-emitting applications. We aim to show that cooperative spatio-temporal regulation of nanomaterils is of vital importance to the development of functional devices. [Figure not available: see fulltext.] © 2017, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

Xie Y.,University of Bergen | Wang D.,Wuhan University of Technology | Csernai L.P.,University of Bergen
Physical Review C | Year: 2017

With a Yang-Mills flux-tube initial state and a high-resolution (3+1)D particle-in-cell relativistic (PICR) hydrodynamics simulation, we calculate the Λ polarization for different energies. The origination of polarization in high energy collisions is discussed, and we find linear impact parameter dependence of the global Λ polarization. Furthermore, the global Λ polarization in our model decreases very quickly in the low energy domain, and the decline curve fits well the recent results of Beam Energy Scan (BES) program launched by the STAR Collaboration at the Relativistic Heavy Ion Collider (RHIC). The time evolution of polarization is also discussed. © 2017 American Physical Society.

Fan X.-L.,Wuhan University | Fan X.-L.,Hubei University of Education | Liao K.,Wuhan University of Technology | Biesiada M.,University of Silesia | And 4 more authors.
Physical Review Letters | Year: 2017

We propose a new model-independent measurement strategy for the propagation speed of gravitational waves (GWs) based on strongly lensed GWs and their electromagnetic (EM) counterparts. This can be done in two ways: by comparing arrival times of GWs and their EM counterparts and by comparing the time delays between images seen in GWs and their EM counterparts. The lensed GW-EM event is perhaps the best way to identify an EM counterpart. Conceptually, this method does not rely on any specific theory of massive gravitons or modified gravity. Its differential setting (i.e., measuring the difference between time delays in GW and EM domains) makes it robust against lens modeling details (photons and GWs travel in the same lensing potential) and against internal time delays between GW and EM emission acts. It requires, however, that the theory of gravity is metric and predicts gravitational lensing similar to general relativity. We expect that such a test will become possible in the era of third-generation gravitational-wave detectors, when about 10 lensed GW events would be observed each year. The power of this method is mainly limited by the timing accuracy of the EM counterpart, which for kilonovae is around 104 s. This uncertainty can be suppressed by a factor of ∼1010, if strongly lensed transients of much shorter duration associated with the GW event can be identified. Candidates for such short transients include short γ-ray bursts and fast radio bursts. © 2017 American Physical Society.

Wang K.,Wuhan University of Technology
2016 IEEE Global Communications Conference, GLOBECOM 2016 - Proceedings | Year: 2016

We consider the scheduling problem concerning N projects. Each project evolves as a multi-state Markov process. At each time instant, one project is scheduled to work, and some reward depending on the state of the chosen project is obtained. The objective is to design a scheduling policy that maximizes the expected accumulated discounted reward over a finite or infinite horizon. The considered problem can be cast into a restless multi-armed bandit (RMAB) problem that is PSPACE-hard, with the optimal policy usually intractable due to the exponential computation complexity. A natural alternative is to consider the easily implementable myopic policy that maximizes the immediate reward. In this paper, we perform an analytical study on the considered RMAB problem, and establish a set of closed-form conditions to guarantee the optimality of the myopic policy. © 2016 IEEE.

News Article | April 17, 2017
Site: phys.org

The natural structure found within leaves could improve the performance of everything from rechargeable batteries to high-performance gas sensors, according to an international team of scientists. The researchers have designed a porous, such as the veins of a leaf, and could make energy transfers more efficient. The material could improve the performance of rechargeable batteries, optimizing the charge and discharge process and relieving stresses within the battery electrodes, which, at the moment, limit their life span. The same material could be used for high performance gas sensing or for catalysis to break down organic pollutants in water. To design this bio-inspired material, an international team comprising scientists from China, the United Kingdom, United States and Belgium is mimicking the rule known as 'Murray's Law' which helps natural organisms survive and grow. According to this Law, the entire network of pores existing on different scales in such biological systems is interconnected in a way to facilitate the transfer of liquids and minimize resistance throughout the network. The plant stems of a tree, or leaf veins, for example, optimize the flow of nutrients for photosynthesis with both high efficiency and minimum energy consumption by regularly branching out to smaller scales. In the same way, the surface area of the tracheal pores of insects remains constant along the diffusion pathway to maximize the delivery of carbon dioxide and oxygen in gaseous forms. The team, led by Prof Bao-Lian Su, a life member of Clare Hall, University of Cambridge and who is also based at Wuhan University of Technology in China and at the University of Namur in Belgium, adapted Murray's Law for the fabrication of the first ever synthetic 'Murray material' and applied it to three processes: photocatalysis, gas sensing and lithium ion battery electrodes. In each, they found that the multi-scale porous networks of their synthetic material significantly enhanced the performance of these processes. "This study demonstrates that by adapting Murray's Law from biology and applying it to chemistry, the performance of materials can be improved significantly. The adaptation could benefit a wide range of porous materials and improve functional ceramics and nano-metals used for energy and environmental applications." "The introduction of the concept of Murray's Law to industrial processes could revolutionize the design of reactors with highly enhanced efficiency, minimum energy, time, and raw material consumption for a sustainable future." Writing in Nature Communications this week, the team describes how it used zinc oxide (ZnO) nanoparticles as the primary building block of their Murray material. These nanoparticles, containing small pores within them, form the lowest level of the porous network. The team arranged the ZnO particles through a layer-by layer evaporation-driven self-assembly process. This creates a second level of porous networks between the particles. During the evaporation process, the particles also form larger pores due to solvent evaporation, which represents the top level of pores, resulting in a three level Murray material. The team successfully fabricated these porous structures with the precise diameter ratios required to obey Murray's law, enabling the efficient transfer of materials across the multilevel pore network. Co-author, Dr Tawfique Hasan, of the Cambridge Graphene Centre, part of the University's Department of Engineering, adds: "This very first demonstration of a Murray material fabrication process is incredibly simple and is entirely driven by the nanoparticle self-assembly. Large scale manufacturability of this porous material is possible, making it an exciting, enabling technology, with potential impact across many applications." With its synthetic Murray material, with precise diameter ratios between the pore levels, the team demonstrated an efficient breakdown of an organic dye in water by using photocatalysis. This showed it was easy for the dye to enter the porous network leading to efficient and repeated reaction cycles. The team also used the same Murray material with a structure similar to the breathing networks of insects, for fast and sensitive gas detection with high repeatability. The team proved that its Murray material can significantly improve the long term stability and fast charge/discharge capability for lithium ion storage, with a capacity improvement of up to 25 times compared to state of the art graphite material currently used in lithium ion battery electrodes. The hierarchical nature of the pores also reduces the stresses in these electrodes during the charge/discharge processes, improving their structural stability and resulting in a longer life time for energy storage devices. The team envisions that the strategy could be used effectively in materials designs for energy and environmental applications. Explore further: Researchers optimize the assembly of micro-/meso-/macroporous carbon for Li-S batteries More information: Xianfeng Zheng et al, Bio-inspired Murray materials for mass transfer and activity, Nature Communications (2017). DOI: 10.1038/ncomms14921

Ahmad N.,Wuhan University of Technology | Chughtai A.H.,Wuhan University of Technology | Chughtai A.H.,Bahauddin Zakariya University | Younus H.A.,Wuhan University of Technology | And 3 more authors.
Coordination Chemistry Reviews | Year: 2014

Discrete metal-carboxylate cage-like materials are an important class of metal-organic polyhedra. The designs of these self-assemblies in terms of their characteristic polygonal shape, surface area, and related properties are functions of metal centers and carboxylate bridging linkers. Thus, several combinations of different metal ions with angular, linear ditopic, or tritopic carboxylic links can be integrated to map these nanoscale materials, as well as the optional functional groups for the ligands. Synthetic protocols based on variations in the solvent, temperature, and pressure can be employed to achieve metal-carboxylate self-organization. These types of discrete polyhedral nanocages with an internal void are materials with a broad spectrum of potential future uses as substrates for extended networks and highly selective gas sorbents in catalysis and biomedical processes. © 2014 Elsevier B.V.

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.

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.

Tong G.,Zhejiang Normal University | Liu F.,Zhejiang Normal University | Wu W.,Zhejiang Normal University | Du F.,Zhejiang Normal University | Guan J.,Wuhan University of Technology
Journal of Materials Chemistry A | Year: 2014

Rambutan-like heterostructures consisting of Ni microspheres coated with oriented multiwall carbon nanotubes (MWCNTs) were synthesized by the one-pot thermal decomposition of a mixture of organic matter and Ni precursors. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy were used to reveal the formation mechanism. The growth of MWCNTs capped by Ni nanoparticles on the surface of the Ni nanoparticle-built microspheres followed a tip-growth mode. The composition and morphology of the rambutan-like heterostructures were easily controlled by changing the reaction time, mass ratio δ of polyethylene glycol (PEG) 20 000 to NiO, as well as type of C source and Ni precursor. Increasing the δ favored not only the increased C mass fraction but also the morphological conversion from Ni/C film core-shell structures to rambutan-like Ni/MWCNT heterostructures. Such changes caused the decreased saturation magnetization and enhanced permittivity properties with δ. Owing to intensive eddy current loss and multiresonance behaviors, rambutan-like Ni/MWCNT heterostructures with long MWCNTs exhibited significantly improved complex permeability and magnetic loss. Ni/MWCNT heterostructures coated by short MWCNTs showed an optimal microwave absorption property with a minimum RL value of -37.9 dB occurring at 12.8 GHz. This work provides effective guidelines for devising and synthesizing highly efficient microwave-absorbing materials. © the Partner Organisations 2014.

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.

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.

Ahmad N.,Wuhan University of Technology | Younus H.A.,Wuhan University of Technology | Younus H.A.,Fayoum University | Chughtai A.H.,Wuhan University of Technology | And 3 more authors.
Chemical Society Reviews | Year: 2015

New well-designed materials are highly demanded with the prospect of versatile properties, offering successful applications as alternates to conventional materials. Major new insights into metal-organic self-assembled structures assisting biochemical purposes have recently emerged. Metal-organic polyhedral cages are highlighted as new research materials to be used for therapeutic, sensing and imaging, purposes etc. This tutorial review covers achievements in the biochemical applications of these multinuclear complexes. Examples of their ability to aid the ionic transport, biomolecular sensing, imaging, and drug delivery are presented. © The Royal Society of Chemistry 2015.

Zhang J.,Wuhan University of Technology | Zhang J.,University of Adelaide | Qiao S.Z.,University of Adelaide | Qi L.,Wuhan University of Technology | Yu J.,Wuhan University of Technology
Physical Chemistry Chemical Physics | Year: 2013

Production of hydrogen from photocatalytic water splitting has become an attractive research area due to the possibility of converting solar energy into green chemical energy. In this study, novel NiS nanoparticle (NP) modified CdS nanorod (NR) p-n junction photocatalysts were prepared by a simple two-step hydrothermal method. Even without the Pt co-catalyst, the as-prepared NiS NP-CdS NR samples exhibited enhanced visible-light photocatalytic activity and good stability for H2-production. The optimal NiS loading content was determined to be 5 mol%, and the corresponding H2-production rate reached 1131 μmol h-1 g-1, which is even higher than that of the optimized Pt-CdS NRs. It is believed that the assembly of p-type NiS NPs on the surface of n-type CdS NRs could form a large number of p-n junctions, which could effectively reduce the recombination rates of electrons and holes, thus greatly enhancing the photocatalytic activity. This work not only shows a possibility for the utilization of low cost NiS nanoparticles as a substitute for noble metals (such as Pt) in the photocatalytic H 2-production but also provides a new insight into the design and fabrication of other new p-n junction photocatalysts for enhancing H 2-production activity. © 2013 the Owner Societies.

Xiang Q.,Wuhan University of Technology | Lv K.,Wuhan University of Technology | Lv K.,the State Ethnic Affairs Commission | Yu J.,Wuhan University of Technology
Applied Catalysis B: Environmental | Year: 2010

Surface-fluorinated anatase TiO2 nanosheets with dominant {0 0 1} facets were fabricated by a simple hydrothermal route in a Ti(OC4H9)4-HF-H2O mixed solution. The atomic ratios of fluorine to titanium (RF) exhibit an obvious influence on the structures and photocatalytic activity of TiO2 samples. In the presence of HF, TiO2 nanosheets can be easily obtained. With increasing RF, the relative anatase crystallinity, average crystallite size, pore size and percentage of exposed {0 0 1} facets increase, contrarily, BET specific surface areas decrease. All fluorinated TiO2 nanosheets exhibit much higher photocatalytic activity than Degussa P-25 TiO2 (P25) and pure TiO2 nanoparticles prepared in pure water due to the synergistic effect of surface fluorination and exposed {0 0 1} facets on the photoactivity of TiO2. Especially, at RF = 1, the fluorinated TiO2 nanosheet exhibits the highest photocatalytic activity, and its photoactivity exceeds that of P25 by a factor of more than nine times. © 2010 Elsevier B.V. All rights reserved.

Zhang J.,Wuhan University of Technology | Qi L.,Wuhan University of Technology | Ran J.,University of Adelaide | Yu J.,Wuhan University of Technology | Qiao S.Z.,University of Adelaide
Advanced Energy Materials | Year: 2014

A ternary ZnxCd1-xS-based material in the co-presence of NiS and reduced graphene oxide (RGO) is designed and synthesized. It shows a high solar photocatalytic H2-production activity and the apparent quantum efficiency of 31.1% at 420 nm. This represents one of the most active metal sulfide photocatalysts in the absence of noble-metal cocatalysts and the significantly improved performance can be attributed to the positive synergetic effect of NiS and RGO over ZnxCd1-xS. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Ran J.,University of Adelaide | Zhang J.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Qiao S.Z.,University of Adelaide
ChemSusChem | Year: 2014

The application of various earth-abundant Ni species, such as NiS, Ni, Ni(OH)2, and NiO, as a co-catalyst in a ZnxCd1-xS system for visible-light photocatalytic H2 production was investigated for the first time. The loading of Ni or NiS enhanced the photocatalytic activity of ZnxCd1-xS because they could promote the electron transfer at the interface with ZnxCd1-xS and catalyze the H2 evolution. Surprisingly, Ni(OH)2-loaded ZnxCd1-xS exhibits a very high photocatalytic H2-production rate of 7160 μmolh-1 g-1 with a quantum efficiency of 29.5% at 420 nm, which represents one of the most efficient metal sulfide photocatalysts without a Pt co-catalyst to date. This outstanding activity arises from the pronounced synergetic effect between Ni(OH)2 and metallic Ni formed in situ during the photocatalytic reaction. However, the loading of NiO deactivated the activity of ZnxCd1-xS because of their unmatched conduction band positions. This paper reports the optimization of the ZnxCd1-xS system by selecting an appropriate Ni-based cocatalyst, Ni(OH)2, from a series of Ni species to achieve the highest photocatalytic H2-production activity for the first time and also reveals the roles of these Ni species in the photocatalytic activity. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA.

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.

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.

Xie C.,Wuhan University of Technology | Ogden J.M.,University of California at Davis | Quan S.,Wuhan University of Technology | Chen Q.,Wuhan University of Technology
International Journal of Electrical Power and Energy Systems | Year: 2013

In this study, a test station of fuel cell-battery hybrid powertrain is established for validating the control strategy and system components as a Hardware-in-the-Loop test platform. Firstly, a fuel cell and LiFeO4 battery pack full hybrid powertrain is presented and the structure and methods of the module-based test station are described. Secondly, a power management strategy is proposed for the hybrid powertrain, aiming to minimize the hydrogen consumption of the fuel cell stack with a limited power rising rate and meanwhile to obtain a given depleting value for the state of charge (SOC) of the battery pack over the ECE driving cycle. The strategy has been implemented in the Matlab/Simulink software and its effectiveness is evaluated by the simulation results and experimental data from the test station. Finally, it is deduced that the proposed fuel cell-battery full hybrid powertrain can bring about greater improvements in driving range than pure battery electric vehicle. Thus, it is confirmed that the full hybrid structure and optimal control scheme can be used to achieve specific objectives for fuel cell-battery hybrid powertrains. © 2013 Elsevier Ltd. All rights reserved.

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.

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.

Ran J.,University of Adelaide | Zhang J.,University of Adelaide | Zhang J.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | And 2 more authors.
Chemical Society Reviews | Year: 2014

Photocatalytic water splitting represents a promising strategy for clean, low-cost, and environmental-friendly production of H2 by utilizing solar energy. There are three crucial steps for the photocatalytic water splitting reaction: solar light harvesting, charge separation and transportation, and the catalytic H2 and O2 evolution reactions. While significant achievement has been made in optimizing the first two steps in the photocatalytic process, much less efforts have been put into improving the efficiency of the third step, which demands the utilization of cocatalysts. To date, cocatalysts based on rare and expensive noble metals are still required for achieving reasonable activity in most semiconductor-based photocatalytic systems, which seriously restricts their large-scale application. Therefore, seeking cheap, earth-abundant and high-performance cocatalysts is indispensable to achieve cost-effective and highly efficient photocatalytic water splitting. This review for the first time summarizes all the developed earth-abundant cocatalysts for photocatalytic H2- and O2-production half reactions as well as overall water splitting. The roles and functional mechanism of the cocatalysts are discussed in detail. Finally, this review is concluded with a summary, and remarks on some challenges and perspectives in this emerging area of research. © the Partner Organisations 2014.

Tong G.,Wuhan University of Technology | Tong G.,Zhejiang Normal University | Guan J.,Wuhan University of Technology | Zhang Q.,Wuhan University of Technology
Materials Chemistry and Physics | Year: 2011

This paper describes an original and facile method for preparing goethite (α-FeOOH) hierarchical nanostructures (HNSs), as well as chemically converting into hematite (α-Fe2O3) under the preservation of α-FeOOH complex morphology. This method was based on a forced hydrolysis-oxidation of iron (II) salts in the presence of d-(+)-glucose as structure-directing agents, where control over the concentration and feeding way of d-(+)-glucose can considerably modulate the morphologies of the α-FeOOH HNSs from 1D unique architecture composed of arrayed nanoplates to 3D sea urchin-like superstructures. Moreover, using the sea urchin-like α-FeOOH nanostructures as precursors, the α-Fe2O 3 HNSs with the same morphology but tailored crystallization and texture characteristics are robustly achieved only by adjusting annealing temperature. The formation mechanism of the α-FeOOH HNSs is proposed to be the synergistic effects of polar interaction and magnetic interaction between the building blocks of the nanoparticles. Due to the high BET specific surface area and favorable crystallization, the α-Fe2O3 HNSs obtained at 300 °C show excellent photocatalytic efficiency. Taking advantages of environmental benign biocompatibility, chemical stability and potential for mass generation, the α-Fe2O3 HNSs described in this work are believed to have a wide range of applications including catalysis, gas sensing. © 2011 Elsevier B.V. All rights reserved.

Tong G.,Wuhan University of Technology | Tong G.,Zhejiang Normal University | Guan J.,Wuhan University of Technology | Zhang Q.,Wuhan University of Technology
Advanced Functional Materials | Year: 2013

A novel and versatile gas bubble induced self-assembly technique is developed for the one-step fabrication of vertically aligned polycrystalline Co3O4 nanotube arrays (NTAs) by the rapid thermal decomposition of Co(NO3)2·6H2O on a flat substrate. In this protocol, the in situ generation and release of gas bubbles, which can be regulated by elaborately adjusting the kinetic factors such as reaction time, decomposition temperature and pressure as well as the content of the chemically adsorbed water, play a vital role in the formation of the Co 3O4 NTAs. Due to the shape anisotropy, ordered hierarchically porous structure and high surface area, the as-obtained Co 3O4 NTAs show unique magnetic properties of a low Néel temperature and a large exchange bias field, as well as an initial discharge capacity up to 1293 mAh·g-1 at 35 mA·g -1 and the retention of a charge capacity as high as 895.4 mAh·g-1 after 10 cycles. This endows them with important potential use in magnetic shielding, magnetic recording media, and lithium ion batteries, etc. Due to the simplicity of the self-assembly method, this process is applicable to the large-scale production of the Co3O4 NTAs, and may be extended to other materials. A versatile gas bubble-induced self-assembly technique based on thermal decomposition of Co(NO 3)2·6H2O on a flat substrate is developed for the novel one-step fabrication of vertically aligned arrays of Co3O4 nanotubes, which show unique magnetic properties and enhanced electrochemical activity, and thus have promising applications in magnetic shielding, energy storage, etc. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Yu X.,Nanjing University of Information Science and Technology | Yu X.,Wuhan University of Technology | Guo S.,Wuhan University of Technology | Guo J.,Wuhan University of Technology | Huang X.,Wuhan University of Technology
Expert Systems with Applications | Year: 2011

E-alliance is the union of e-commerce and its success and efficiency is related to comprehensive quality of e-commerce. Thus, ranking e-commerce websites in e-alliance is of importance, which is a multi-criteria decision-making (MCDM) problem. This paper proposes an evaluation model based on analytic hierarchy process (AHP), fuzzy sets and technique for order performance by similarity to ideal solution (TOPSIS), to tackle the issue in fuzzy environment. The AHP is applied to analyze the structure of ranking problem and to determine weights of the criteria, fuzzy sets is utilized to present ambiguity and subjectivity with linguistic values parameterized by triangular fuzzy numbers, and TOPSIS method is used to obtain final ranking. Case analysis is conducted to illustrate the utilization of the model for the problem. It demonstrates the effectiveness and feasibility of the proposed model. © 2010 Elsevier Ltd. All rights reserved.

Chen H.H.,Macau University of Science and Technology | Lee A.H.I.,Chung Hua University | Chen S.,Wuhan University of Technology
Applied Energy | Year: 2014

Ever since its commitment to the Copenhagen Accord of 2009 to lower its carbon emissions by 2020 to a level that will be 40% below those of 2005, China has been aiming to develop its photovoltaic (PV) solar energy industry. Because knowledge is a critical factor for obtaining a sustainable competitive advantage in a knowledge-intensive industry, it is essential to build up an interactive learning and communicating platform as a facilitator to absorb, distribute and create knowledge within a firm and among its suppliers and customers. However, relevant literature has, hitherto, never discussed such an intermediary platform for innovation. Therefore, this paper proposes some conceptual assumptions to solve this problem. After a practical investigation, this paper seeks to find suitable intermediaries for innovation at different levels of the PV solar energy supply chain in China. © 2013 Elsevier Ltd.

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.

Wang P.,Wuhan University of Technology | Wang J.,Wuhan University of Technology | Wang X.,Wuhan University of Technology | Yu H.,Wuhan University of Technology | And 3 more authors.
Applied Catalysis B: Environmental | Year: 2013

The addition of reduced graphene oxide (rGO) in the TiO2 has been demonstrated to be one of the effective methods to improve the photocatalytic performance of TiO2 photocatalyst. Despite tremendous efforts, developing facile and green synthetic method of TiO2-rGO nanocomposites still remains a great challenge. In this study, a one-step green hydrothermal method for the fabrication of easily recycled TiO2-rGO composites, based on the initial formation of strong-coupling TiO2-GO nanocomposite and the subsequent in situ reduction of GO to rGO during hydrothermal treatment, was developed in the pure water without using any reductant and surfactant. It is found that the TiO2 nanoparticles with a clean surface and a good dispersion are highly required for the formation of the easy-recycling TiO2-rGO composite photocatalyst. Photocatalytic experimental results indicated that compared with the high-efficiency P25 TiO2 precursor, the photocatalytic performance could be obviously improved (about 23%) for the decomposition of phenol after coupling 1-wt% rGO. The enhanced photocatalytic performance can be attributed the cooperation effect of the effective separation of charge carriers via rGO cocatalyst, the enrichment of phenol molecular on the rGO, and the strong coupling interaction between TiO2 nanoparticles and rGO nanosheets. Considering its completely green and facile preparation and recyclable feature from an aqueous solution, the present TiO2-rGO nanocomposite photocatalyst can be regards as one of the ideal photocatalysts for various potential applications. © 2012 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.

Jian Z.,CAS Institute of Physics | Jian Z.,Wuhan University of Technology | Zhao L.,CAS Institute of Physics | Pan H.,CAS Institute of Physics | And 4 more authors.
Electrochemistry Communications | Year: 2012

A Na3V2(PO4)3 sample coated uniformly with a layer of 6 nm carbon has been successfully synthesized by a one-step solid state reaction. This material shows two flat voltage plateaus at 3.4 V vs. Na+/Na and 1.63 V vs. Na+/Na in a nonaqueous sodium cell. When the Na3V2(PO4)3/C sample is tested as a cathode in a voltage range of 2.7-3.8 V vs. Na +/Na, its initial charge and discharge capacities are 98.6 and 93 mAh/g. The capacity retention of 99% can be achieved after 10 cycles. The electrode shows good cycle performance and moderate rate performance. When it is tested as an anode in a voltage range of 1.0-3.0 V vs. Na+/Na, the initial reversible capacity is 66.3 mAh/g and the capacity of 59 mAh/g can be maintained after 50 cycles. These preliminary results indicate that Na 3V2(PO4)3/C is a new promising material for sodium ion batteries. © 2011 Elsevier B.V. All rights reserved.

Ma X.,Wuhan University of Technology | Wang M.-C.,Kaohsiung Medical University | Feng J.,Wuhan University of Technology | Zhao X.,Wuhan University of Technology
Acta Materialia | Year: 2015

The effect of solution volume covariation on the growth mechanism of Au nanorods synthesized using a seed-mediated method was studied. The results from the ultraviolet-visible absorption spectra of gold nanorods GNRs revealed that the transverse surface plasmon resonance was ∼550 nm for all GNR samples synthesized in various total volumes of growth solutions. The wavelength of longitudinal surface plasmon resonance of GNRs increased from 757 to 915 nm, with the total volume of growth solution being raised from 10 to 320 ml. Moreover, the calculated aspect ratio AR) also increased from 3.55 to 5.21 while the total volume of growth solution increased from 10 to 320 ml. Transmission electron microscopy microstructures showed that the growth mechanism of GNRs along 〈1 0 0 is in accordance with the hypothesis that the ratio of the number of monodispersed Au atoms existing in the growth solution to the number of seeds explain the behavior of Au atoms deposited on the nanorods with respect to all of the constituent concentrations in the growth solution on the AR of GNRs. © 2014 Acta Materialia Inc. All rights reserved.

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.

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.

Jian Z.,CAS Institute of Physics | Jian Z.,Wuhan University of Technology | Han W.,CAS Institute of Physics | Lu X.,CAS Institute of Physics | And 9 more authors.
Advanced Energy Materials | Year: 2013

A Na3V2(PO4)3/C composite with 3.8 wt.% carbon, which was synthesized by a one-step solid state reaction, exhibits Na storage capacity of 107 mAh g-1 and high coulombic efficiency of 99.8% in a new NaFSI/PC electrolyte. In situ XRD results reveal its sodium storage mechanism as a typical two-phase reaction from the Na 3V2(PO4)3 to NaV2(PO 4)3 phases with 8.26% volume variation. These desired properties make it very promising for application in room-temperature sodium-ion batteries. © 2013 WILEY-VCH Verlag GmbH and Co.

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.

Wang K.,Wuhan University of Technology | Chen L.,University Paris - Sud | Liu Q.,Wuhan University of Technology
IEEE Journal on Selected Topics in Signal Processing | Year: 2013

We consider an underlay cognitive radio (CR) communication system in which a cognitive secondary user (SU) can access multiple primary spectrum channels only when its interference to the primary users (PU) is limited. To identify and exploit instantaneous transmission opportunities, the SU probes a subset of primary channels by overhearing the primary feedback signals so as to learn the primary receiver's channel condition and the interference tolerance level, then chooses appropriate power to transmit its data. In such context, the SU cannot probe all the channels for its limited number of receiving antennas, then a crucial optimization problem faced by the SU is to probe which channel(s) in order to maximize the long-term throughput given the past probing history. In this paper, we tackle this optimization problem by casting it into a restless multi-armed bandit (RMAB) problem that is of fundamental importance in decision theory. Given the specific and practical constraints posed by the problem, we analyze the myopic probing policy which consists of probing the best channels based on the past observation. We perform an analytical study on the optimality of the developed myopic probing policy. Specifically, for a family of generic and practically important utility functions, we establish the closed-form conditions to guarantee the optimality of the myopic probing policy, and also illustrate our analytical results via simulations on several typical network scenarios. © 2013 IEEE.

Wang K.,Wuhan University of Technology | Chen L.,University Paris - Sud | Liu Q.,Wuhan University of Technology
IEEE Transactions on Vehicular Technology | Year: 2014

We consider the access problem in a multichannel opportunistic communication system with imperfect sensing, where the state of each channel evolves as a nonidentical and independently distributed Markov process. This problem can be cast into a restless multiarmed bandit (RMAB) problem, which is intractable for its exponential computation complexity. A promising approach that has attracted much research attention is the consideration of an easily myopic policy that maximizes the immediate reward by ignoring the impact of the current policy on future reward. Specially, we formalize a family of generic functions, which is referred to as \$g\$-regular functions, characterized by three axioms, and then establish a set of closed-form conditions for the optimality of the myopic policy and illustrate the engineering implications behind the obtained results. © 2013 IEEE.

Xu J.,CAS Shanghai Institute of Microsystem and Information Technology | Wang J.,University of Electronic Science and Technology of China | Zhu Y.,Wuhan University of Technology | Yang Y.,Nanjing Southeast University | And 3 more authors.
IEEE Communications Magazine | Year: 2014

The fifth generation mobile networks will be developed to improve area spectral and energy efficiency, and provide uniform user experience. Hyper-dense small cell deployment can move devices closer to the wireless network and satisfy 5G system requirements. The main challenge of this network deployment results from the random deployment, dynamic on-off, flexible connection to cellular core networks, and flat system architecture of 5G systems. Therefore, conventional network planning and radio resource management, which depend on a central control node, cannot be applied to small cell networks. In this article some cooperative distributed radio resource management algorithms for time synchronization, carrier selection, and power control are discussed for hyper-dense small cell deployment. © 2014 IEEE.

Zhou W.,Wuhan University of Technology | Wang M.-C.,Kaohsiung Medical University | Zhao X.,Wuhan University of Technology
Solar Energy | Year: 2015

Poly(methyl methacrylate) (PMMA) doped with various amounts of the organic-dye 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) for luminescent solar concentrator (LSC) applications have been studied. The maximum wavelength of the emission peaks increases from 555 to 561nm as the doped amount of organic-dye DCJTB increases from 2.08 (sample L3) to 8.33mg (sample L5), which reveals a slight red-shift effect. The difference between the maximum wavelengths of the absorption and emission spectra (λs) decreases from 58 to 47nm as the doped amount of organic-dye DCJTB increases from 2.08 to 8.33mg, which shows the Stokes shift. The short circuit photocurrent (Isc) increases from 11.68 to 14.11mA/cm2 as the doped amount of organic-dye DCJTB increases from 0 (undoped, sample L0) to 8.33mg. The optical efficiency (ηopt) also increases from 41.67% to 60.00% as the doped amount of organic-dye DCJTB increases. The maximum value of the incident photon-to-current conversion efficiency (IPCE) was about 9.0% at 526nm when doped with 8.33mg of organic-dye DCJTB (sample L5). The results of the present paper show through a well-conducted study on the optical properties of PMMA doped with organic-dye DCJTB that it can be suitable for LSC applications. © 2015 Elsevier Ltd.

News Article | February 21, 2017
Site: www.altenergystocks.com

Debra Fiakas is the Managing Director of , an alternative research resource on small capitalization companies in selected industries. Last month BioSolar BSRC :  OTC/PK) reported positive test results for its proprietary energy storage technology.  The company is developing an alternative anode material for lithium ion batteries using silicon-carbon materials.  BioSolar’s engineers are targeting dramatic improvement in anode performance and equally impressive reductions in cost.  If they are successful, it could mean longer lithium ion battery life, greater capacity and shorter charging time  -  the dreams of every manufacturer with an electronic product.Most lithium ion batteries rely on graphite for the battery anode.  However, silicon anodes could offer as much as ten times more capacity as anodes made with graphite.  Unfortunately, silicon has a few downsides that make it unreliable as well as unaffordable.  BioSolar is working to overcome those downsides and make silicon anodes an affordable alternative by using a silicon alloy.Biosolar is also working on the other important battery component  -  the cathode.  Existing lithium ion batteries are limited by the capacity of the cathode.  The company has developed a new cathode made from a conductive polymer that can withstand higher charge-discharge cycles.  This would extend the life of the lithium ion battery and lower the overall cost of operation.  In June 2017, the company filed an application for patent protection of its proprietary process and material for high capacity cathodes.The company is not alone in the quest for a better lithium ion battery.  There are others experimenting with polymers and silicon-based materials for lithium ion energy storage.  For example, researchers at the University of Leeds in the United Kingdom, Lawrence Berkeley National Laboratory in California, Wuhan University of Technology in China, and Pacific Northwest National Laboratory in Washington are just four of several research and development groups publishing papers on their experiments with conductive polymers.  The activity could be a source of competition, support or distraction for BioSolar.  For example, the University of Leeds has licensed its technology to privately held Polystor Energy Corporation in the U.S., which planned to commercialize the Leeds polymer gel for use as the electrolyte in a lithium ion battery.  While Polystor would not have competed against BioSolar's anode or cathode materials, its progress or lack of progress could have an impact on investors' view of polymer technology in the energy storage sector.BioSolar’s research and development efforts are led by its Chief Technology Officer, Dr. Stanley Levy.  With a dozen patents in his own name, Levy has been recognized by his peers for technical work on plastics and film development.  His prior experience includes stints at DuPont, Global Solar and Solar Integrated Technologies.Besides the mechanical engineering background of Levy, BioSolar’s chief executive officer, David Lee, brings electrical engineering education and experience to team.  Lee founded BioSolar after working in various engineering positions at the electronics, space and defense units of TRW as well as management roles at RF-Link Technology, Inc. and Applied Reasoning, Inc.  A plus for BioSolar is Lee’s time in the trenches in marketing and sales, which will be needed to get the company’s technology turned into marketable products.As a developmental stage company BioSolar has no revenue.  Its operations are limited to managing sponsored research activities.  BioSolar has received support for its research activities from the University of California at Santa Barbara .  For the rest of its work the company relies on cash resources to support its development plans.  Operating expenses have been near \$600,000 per quarter.  One of the company’s most significant expenses is a research arrangement with North Carolina Agriculture and Technical State University , which is conducting tests on BioSolar’s polymer and silicon-alloy materials.With only \$244,776 in its bank account at the end of September 2016, any investor considering a position in BSRC might take pause.   Since the close of the September quarter the company entered into an arrangement for an unsecured convertible promissory note for up to \$500,000.    Nonetheless, expect more capital raising efforts involving dilutive securities of some kind or another.  There is really no other way to entice investors to an early stage company than to offer a piece of the pie.  The company has not yet found sponsorship by a large investor or strategic partner, so capital raising activities appear to be limited to individual investors.For investors with no interest in a private placement, there are shares quoted on the Over-the-Counter market.   At a nickel, the shares are price like options on management’s ability to reach the development milestone before running out of money.  It is a high risk proposition, but one that could yield exceptional returns if BioSolar is successful in getting its materials into a working prototype battery and the market recognizes some value the accomplishment. Neither the author of the Small Cap Strategist web log, Crystal Equity Research nor its affiliates have a beneficial interest in the companies mentioned herein.

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.

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

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.

Liu C.,Wuhan University of Technology | Zhao X.,Wuhan University of Technology | Heo J.,Pohang University of Science and Technology
Journal of Non-Crystalline Solids | Year: 2013

Er3 +-doped lead fluoride nanocrystals (NCs) were precipitated in glasses by heat treatment at 490 C, and the distribution of Er3 + ions inside the NCs was investigated using electron energy loss spectroscopy. Nucleation started with the formation of 2-4-nm-diameter NCs highly enriched in Er3 +. With further heat treatment, NCs with inhomogeneous Er 3 + distribution grew. Crystal structure in individual fluoride NCs changed from tetragonal to cubic due to the variation in Er3 + concentration. © 2013 Elsevier B.V. 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.

Liu C.,Wuhan University of Technology | Liu C.,Pohang University of Science and Technology | Heo J.,Pohang University of Science and Technology
Journal of the American Ceramic Society | Year: 2012

The preferential incorporation of Er 3+ ions into the PbF 2nanocrystals during the ceraming process of oxyfluoride glass was analyzed using electron energy loss spectroscopy analysis. Concentrations of Er 3+ ions were considerably higher in PbF 2nanocrystals compared to those in the glass matrix. Changes in lineshapes of absorption spectra from Er 3+: 4 I 15/2 4 I 13/2transition and lifetimes of the excited-state Er 3+ ( 4 S 3/2level) ions also supported the incorporation of Er 3+ ions into PbF 2nanocrystals. © 2012 The American Ceramic Society.

Mo L.,Wuhan University of Technology | Li X.,Wuhan University of Technology | Fang X.,Wuhan University of Technology | Huurman M.,BAM Wegen Bv | Wu S.,Wuhan University of Technology
Construction and Building Materials | Year: 2012

This paper focuses on the compaction characteristics and performance of warm mix asphalt containing chemical additive. Viscosity tests indicated the used chemical additive had a limited effect on viscosity reduction. Investigation into the ease of compaction showed that asphalt mixtures containing 2% chemical additive allowed compacting at lower temperatures and mixture compactability was less dependent on bitumen viscosity. It was demonstrated that the compactability of warm mix asphalt could be well ranked by using various indicators including the number of gyrations to achieve a design void content, the slope of accumulated compaction energy against the number of gyrations as well as compaction energy indices at various compaction phases. Data obtained from immersion wheel tracking tests indicated that warm mix asphalt containing chemical additive did not have a performance comparable to that of hot mix asphalt. Rutting and stripping were found to be the main causes resulting in poor performance. © 2012 Elsevier Ltd. All rights reserved.

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.

News Article | January 18, 2016
Site: www.nanotech-now.com

News Article | January 14, 2016
Site: phys.org

Ma J.,Wuhan University of Technology
MATEC Web of Conferences | Year: 2016

This paper studies the electric breakdown discharge process of micro-arc oxidation film on the surface of aluminum alloy. Based on the analysis of the AC parameters variation in the micro-arc oxidation process, the following conclusions can be drawn: The growth of oxide film can be divided into three stages, and Oxide film breakdown discharge occurs twice in the micro-arc oxidation process. The first stage is the formation and disruptive discharge of amorphous oxide film, producing the ceramic oxide granules, which belong to solid dielectric breakdown. In this stage the membrane voltage of the oxide film plays a key role; the second stage is the formation of ceramic oxide film, the ceramic oxide granules turns into porous structure oxide film in this stage; the third stage is the growth of ceramic oxide film, the gas film that forms in the oxide film's porous structure is electric broken-down, which is the second breakdown discharge process, the current density on the oxide film surface could affect the breakdown process significantly. © 2016 The Authors, published by EDP Sciences.

Hu P.,Huazhong University of Science and Technology | Meng Q.,Huazhong University of Science and Technology | Sun Q.,Huazhong University of Science and Technology | Zhu N.,Huazhong University of Science and Technology | Guan C.,Wuhan University of Technology
Energy and Buildings | Year: 2012

This paper proposed a new method based on modified composite model in the thermal response test (TRT) in the variable heat rate case study. The new method considered the unsteady-state heat transfer in the borehole instead of the line-source model assumption. A Matlab program was compiled which can perform inversion calculation to obtain the ground thermal properties. The superposition principle was used to process the variable-rate problem. This new method was applied to two thermal response tests. The simulation value based on the method shows a good agreement with the measurement data of water temperature. The proposed method would save the time and reduce the cost of TRT when power fluctuation or failure occurs. © 2011 Elsevier B.V. All rights reserved.

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.

Xiang Q.,Huazhong Agricultural University | Cheng B.,Wuhan University of Technology | Yu J.,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. There's always the sun: Graphene-based photocatalysts for solar-fuel production are of significant interest in solving the global energy problem. The recent advances in the fabrication and application of graphene-based photocatalysts, including photocatalytic reduction of CO2 to hydrocarbon fuels and photocatalytic splitting of water to H2 are explored. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bukhchuluun N.,Wuhan University of Technology
Conference Proceedings of the 4th International Symposium on Project Management, ISPM 2016 | Year: 2016

In recent years, with the development of the China-Mongolian friendly relations between the two countries, bilateral trade and economic, scientific and cultural cooperation in various areas, expanding exchanges between the two countries continues to grow. In this paper, I've researched situation of Mongolia's mining sector and its importance in economy as its focus. Even though Mongolia has vast land rich in coal, copper and uranium deposits, these deposit's prices are gradually rising, foreign direct investment plays a crucial role in development of its sector. Thus, as Mongolia's biggest and most available market, Chinese enterprises have contributed a lot in mining sector. But in recent years, as political situation is becoming more unstable and FDI is decreasing, I have drafted some possible methods for current and prosperous Chinese enterprises using SWOT analysis to more clearly understand pros and cons of investing in Mongolian mining sector.

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
Journal of Materials Chemistry C | Year: 2015

A 2 μm-Pb0.97La0.02(Zr0.75Sn0.18Ti0.07)O3 (PLZST) antiferroelectric (AFE) thick film with tetragonal structure was deposited on LaNiO3/Si (100) substrates via a sol-gel technique. The electrocaloric effect (ECE) of the PLZST thick film was investigated under the influences of an external electric field and temperature. Giant ECEs (ΔT = 53.8 °C and ΔS = 63.9 J K-1 kg-1) were achieved at 5°C, which was attributed to a field-induced AFE to ferroelectric (FE) phase transition. Moreover, a large ΔT of above 30°C was observed in the temperature range of 5°C to 25°C. The maximum electrocaloric coefficient (ξmax = 0.060 K cm kV-1) and refrigeration efficiency (COP = 18) of the film were also obtained at 5°C. At room temperature, the values of ΔT, ΔS, COP and ξmax were 35.0°C, 39.0 J K-1 kg-1, 14 and 0.039 K cm kV-1 at 900 kV cm-1, respectively. The AFE thick films with giant ECEs are promising candidates for applications in cooling systems at room temperature. © 2015 The Royal Society of Chemistry.

Ma P.,Wuhan University of Technology | Wu Y.,Wuhan University of Technology | Fu Z.,Wuhan University of Technology | Wang W.,Wuhan University of Technology
Journal of Alloys and Compounds | Year: 2011

In this study, we reported a method for growing macroporous ZnO on a large scale via a facile solution-based method using citrate as crystal growth modifier. The microstructures were studied by X-ray diffraction, scanning electron microscopy, FT-IR, UV-visible spectrometer and N2- physisorption techniques. Influencing factors on the morphology of ZnO were discussed, including anion species of Zn2+ precursor, adding sequence of sodium citrate, sodium citrate concentration and reaction time. On the basis of the investigation on the growth process, citrate ion-ZnO interaction was vital to the formation of complex structure, which was accompanied by acetate ion induction to form the high-quality macroporous spheres. UV-Vis results exhibited a blue-shift when compared with conventional-sized zinc oxide. The large specific surface area of porous ZnO resulted in enhanced absorption of Rhodamine B and improved photocatalytic activity. © 2011 Elsevier B.V. All rights reserved.

Tian P.,Wuhan University of Technology | Cheng J.,Wuhan University of Technology | Zhang G.,Wuhan University of Technology
Applied Surface Science | Year: 2011

Sm3+ doped CaO-MgO-Al2O3-SiO2 glass and glass ceramics have been prepared. The diopside crystal (CaMgSi 2O6) was identified in the glass ceramics by X-ray diffraction analysis. X-ray photoelectron spectra of the glass and glass ceramics were measured by a monochromatised Al-Kα XPS instrument. Sm 3d core level spectra for the Sm doped samples showed that Sm ions are predominantly in the Sm (III) state in glass and glass ceramics. The O 1s core spectra could be fitted by summing the contributions from bridging oxygen (BO) and non bridging oxygen (NBO) for samarium undoped glass, BO, NBO and Si-O-Sm for the doped glass. The O 1s XPS spectrum of undoped glass ceramics was curve fitted with BO and NBO in glass phase, as well as SiOSi, SiOMg and SiOCa in diopside. In addition to the five components above mentioned, SiOSm in diopside also appeared in O 1s XPS spectra of samarium doped glass ceramics. According to the fitting results, we demonstrate that the Sm2O3 exist in glass network as a glass modifier. After heat treatment, nearly all the Sm3+ existed in diopside phase as the substitution for Ca 2+. © 2010 Published by Elsevier B.V. All rights reserved.

Shui Z.,Wuhan University of Technology | Yu R.,Institute of Materials of Recycling and Evaluation | Dong J.,Wuhan University of Technology
ACI Materials Journal | Year: 2011

The activation of industrial by-products is an efficient way to produce binders for concrete in place of portland cement. This paper presents an experimental study on a new cementitious material using fly ash and dehydrated cement paste (DCP). A low-calcium fly ash was activated with DCP that was obtained by heating hardened cement paste at 1202°F (923.15 K). Specimens were prepared with various ratios of fly ash to DCP. All specimens were cured at 68°F (293.15 K) and a relative humidity above 95% for 1 day and were then cured at 203°F (368.15 K) in a steam room for 2a4 hours before testing. The experimental results showed that the strength of the activated fly ash/DCP paste depends on the value of the theoretical Ca/Si ratio (T-Ca/Si) in the mixture. At the optimum level of T-Ca/Si-0.953-a strength of 8.82 ksi (60.8 N/mm 2) was obtained. The results of the X-ray diffraction (XRD) analysis and the scanning electron microscope (SEM) image analysis indicated that if the value of the T-Ca/Si is optimal, the fly ash can react completely with the DCP and the microstructure is dense, yielding sufficient mechanical properties for structural use. Copynght © 2011, American Concrete Institute. All rights reserved.

Chen M.,Wuhan University of Technology | Lin J.,Wuhan University of Technology | Wu S.,Wuhan University of Technology
Construction and Building Materials | Year: 2011

The main objective of this study is to investigate the potential of using recycled fine aggregates powder (RFAP) as filler in asphalt mixtures. RFAP is a by-product of the production of Recycled Concrete Aggregate (RCA). The disposal of RFAP may cause many serious environmental problems. It is necessary to find potential usage to avoid these problems. In this study, RFAP is used as filler in asphalt mixture by totally replacing conventional limestone powder (LP). Firstly, the properties of RFAP is studied by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and X-ray fluorescence spectroscopy (XRF). Then the indirect tensile strength and modulus tests, three-point bending tests, dynamic creep tests and fatigue tests are conducted to compare the properties between asphalt mixtures with RFAP and traditional asphalt mixture with LP. Results indicate that RFAP can improve the properties of asphalt mixture, such as including water sensitivity and fatigue resistance. However, it may cause a little decrease of the low-temperature performance. All the results indicate that the RFAP can be used in asphalt pavement, especially in hot regions. © 2011 Elsevier Ltd. All rights reserved.

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.

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.

Xiang Q.,Huazhong Agricultural University | Xiang Q.,Wuhan University of Technology | Cheng B.,Wuhan University of Technology | Yu J.,Wuhan University of Technology
Applied Catalysis B: Environmental | Year: 2013

Hierarchical porous CdS nanosheet-assembled flowers were synthesized by a simple ion-exchange strategy using morphology-analogous Cd(OH)2 and Na2S as precursors. The prepared CdS flowers exhibited high visible-light photocatalytic H2-production activity with a rate of 468.7μmolh-1 and the corresponding apparent quantum efficiency (QE) of 24.7% at 420nm, which exceeded that obtained on CdS nanoparticles by more than 3 times. This enhanced photocatalytic H2-production activity was achieved because the hierarchical organization of nanosheets and porous nanosheet structures can efficiently enhance light-absorption ability and provide a greater number of active adsorption sites. This work shows a great potential of hierarchical porous CdS nanosheet-assembled flowers for photocatalytic H2 production, and also demonstrates that the ion-exchange strategy of Cd(OH)2 intermediates can be extended to the preparation of other porous oxides and sulfides with hierarchical nanostructures. © 2013 Elsevier B.V.

He D.,Wuhan University of Technology | Jiang Y.,Wuhan University of Technology | Lv H.,Wuhan University of Technology | Pan M.,Wuhan University of Technology | Mu S.,Wuhan University of Technology
Applied Catalysis B: Environmental | Year: 2013

Pt nanoparticles supported on nitrogen-doped reduced graphene oxide (NRGO) were investigated for use as proton exchange membrane fuel cell catalysts. Artfully, NRGO was synthesized using a lyophilisation-assisted N-doping method, and simultaneous reduction of graphene oxide (GO) was achieved. A nitrogen content as high as 5.06% was obtained with pyridinic-N as the dominant nitrogen species. Pt nanoparticles with an average diameter of 2.5. nm were uniformly loaded on NRGO using impregnation methods. Both cyclic voltammetry and oxygen reduction reaction (ORR) measurements revealed a higher catalytic activity and lower losses of the electrochemically active surface area of this novel Pt/NRGO catalyst in comparison to those of the Pt/GO and conventional Pt/C catalysts. Significantly, the catalytic activity of the Pt/NRGO in ORR showed almost no degradation even after 1000 potential cycles, indicating that our new catalysts have excellent stability. A mechanism for improving the ORR activity and the stability of the Pt/NRGO was tentatively proposed and discussed. © 2012 Elsevier B.V.

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.

Li S.,Wuhan University of Technology | Dong Y.,Wuhan University of Technology | Xu L.,Wuhan University of Technology | Xu L.,Harvard University | And 3 more authors.

Na3V2(PO4)3 nanograins dispersed in different carbon matrices are rationally synthesized and systematically characterized. The acetylene carbon matrix provides the best conductive networks for electrons and sodium ions, which endows Na 3V2(PO4)3 stable cyclability and high rate performance. The Na3V2(PO4) 3-based symmetric sodium-ion batteries show outstanding electrochemical performance, which is promising for large-scale and low-cost energy storage applications. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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.

Sui Y.,Wuhan University of Technology
Environment, Energy and Sustainable Development - Proceedings of the 2013 International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2013 | Year: 2014

In the circumstances of the current energy crisis, the factors that affect the distributed energy consumption are more complex, how to sort out the importance of each factor, is particularly important to the construction of distributed energy systems. To this end, it analysis of fundamentals factors of the behavior of distributed energy consumption based on the related research, made judgment in the importance of the main influencing factors using AHP. Eventually it come to that distributed energy use cost, level of education, distributed energy awareness, the market degree of distributed energy have significant impact on energy enterprises' invest. © 2014 Taylor & Francis Group, London.

Hu B.,Georgia Institute of Technology | Hu B.,Wuhan University of Technology | Ding Y.,Georgia Institute of Technology | Chen W.,Wuhan University of Technology | And 4 more authors.

The insulating phase transition in a VO2 nanobeam when subjected to external-strain is utilized to fabricate a quick response time, highly reproducible, and high gauge factor strain sensor. Raman spectroscopy combined with electromechanical measurement reveals the working principle. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

He D.,Wuhan University of Technology | Cheng K.,Wuhan University of Technology | Li H.,Wuhan University of Technology | Peng T.,Wuhan University of Technology | And 3 more authors.
Langmuir | Year: 2012

Graphene nanosheets (GNS) supporting Pt nanoparticles (PNs) are prepared using perfluorosulfonic acid (PFSA) as a functionalization and anchoring agent. Transmission electron microscope (TEM) results indicate that the prepared Pt NPs are uniformly deposited on GNS with a narrow particle size ranging from 1 to 4 nm in diameter. A high catalytic activity of this novel catalyst is observed by both cyclic voltammetry and oxygen reduction reaction (ORR) measurements due to the increasing of proton (H +) transmission channels. Significantly, this novel PFSA-functionalized Pt/GNS (PFSA-Pt/GNS) catalyst reveals a better CO oxidation and lower loss rate of electrochemical active area in comparison with that of the plain Pt/GNS and conventional Pt/C catalysts, indicating our PFSA-Pt/GNS catalysts hold much higher stability and CO tolerance by virtue of introduction of PFSA. © 2012 American Chemical Society.

Li W.,Wuhan University of Technology | Li W.,Purdue University | Wu T.,Wuhan University of Technology | Wang W.,Wuhan University of Technology | And 2 more authors.
Applied Physics Letters | Year: 2014

Broadening the bandwidth of electromagnetic wave absorbers has greatly challenged material scientists. Here, we propose a two-layer hybrid absorber consisting of a non-planar metamaterial (MM) and a magnetic microwave absorbing material (MAM). The non-planar MM using magnetic MAMs instead of dielectric substrates shows good low frequency absorption and low reflection across a broad spectrum. Benefiting from this and the high frequency strong absorption of the MAM layer, the lightweight hybrid absorber exhibits 90% absorptivity over the whole 2-18 GHz range. Our result reveals a promising and flexible method to greatly extend or control the absorption bandwidth of absorbers. © 2014 AIP Publishing LLC.

Du C.-J.,Wuhan University of Technology
Conference Proceedings of the 4th International Symposium on Project Management, ISPM 2016 | Year: 2016

Big data is a leap for human to know and transform the world, which not only deeply influences the development of science and technology, but also deeply affects the modernization process of educational management. Modernization of educational management is one of the targets of educational development, while opportunities and challenges are the two-sided circumstances of China's educational management in the era of big data. On one hand, big data provides opportunities for promotion of educational management's diversification, democratization and scientification, normalization of educational management's conditions, improving the effectiveness of educational management and modernization of educational management. On the other hand, big data's complexity, uncertainty and low density set up new challenges for modernization of educational management. Lack of data awareness and data talent, risks of information security and invasion of privacy are the complicated dilemma and important conundrum that educational management is facing in the era of big data, which deserves educational management's subject attention.

Yin Z.-W.,Wuhan University of Technology
Conference Proceedings of the 4th International Symposium on Project Management, ISPM 2016 | Year: 2016

Engineering is a "double-edged" sword. Apart from promoting human development, it also brought about various problems and risks to human society. Engineering risks have practical causes, as well as epistemological origins. From the perspective of engineering ethics, this article aims to find out the epistemological origins of engineering risks, which lies in the misleading conventional outlooks of engineering technology, including technology determinism, technology instrumentalism, utilitarianism view of engineering. In order to rectify the misleading concepts, this article suggests that China should constantly improve and development socialist outlook of engineering with Chinese characteristics, and instruct the engineering activities in China with the concept of "Green Development". © 2016 by Aussino Academic Publishing House.

Xu L.,Wuhan University of Technology | Shi W.,Wuhan University of Technology | Guan J.,Wuhan University of Technology
Catalysis Communications | Year: 2012

A crystallized mesoporous CdS/Ta 2O 5 photocatalyst was prepared using an evaporation-induced self-assembly technology followed by crystallization at 850 °C in the presence of siloxane reagents and S 2 - ion-exchange. The as-prepared composite possesses large specific surface areas and thin crystallized pore walls, and thus exhibits a significantly enhanced visible light photocatalytic activity for hydrogen evolution, which is twice as large as that of the amorphous mesoporous CdS/Ta 2O 5 and is nearly 4 times larger than that of the directly crystallized CdS/Ta 2O 5. This enhancement is attributed to the efficient utilization of photogenerated charges resulting from the synergistic effect of high crystallinity and well-fabricated mesostructures. © 2011 Elsevier B.V. All rights reserved.

Zhou P.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Wang Y.,Henan University
Applied Catalysis B: Environmental | Year: 2013

The geometry structure, formation energy and electronic property of NS codoped anatase TiO2 (NSTiO2) were investigated by the density functional theory (DFT) of first-principles. The result indicated that the O-poor growth condition is beneficial to the formation of NSTiO2 except the NTiSTiTiO2 with non-sensitivity to the atmosphere. The visible-light photocatalytic activity of NSTiO2 was influenced by many factors including the value of energy gap (Eg), the distribution of impurity level, the property of impurity level, the location of Fermi level and the energy in the edges of band gap. The impurity level localized in the top of valence band reduced the energy gap, leading to the absorption of visible light. Besides, the impurity level delocalized in the band gap reduced the critical energy of available photon, which further strengthened the absorption of visible light. Moreover, the bent impurity level was the efficient separation center of photogenerated electron and hole, while the flat impurity level was the combination center of photogenerated electron and hole. Further, the valence band and conduction band of NSTiO2 moved toward the low energy region (down shift), resulting in the stronger oxidizability of photogenerated hole in the top of valence band and weaker reducibility of photogenerated electron in the bottom of conduction band. This indicated that the dominant oxidant species during photocatalytic reaction for NSTiO2 was hole and OH radical instead of O2 - ion. © 2013 Elsevier B.V.

Wan H.-X.,Wuhan University of Technology | Mahendran M.,Queensland University of Technology
Engineering Structures | Year: 2015

The LiteSteel beam (LSB) is a cold-formed high strength steel channel section made of two torsionally rigid closed flanges and a slender web. Due to its mono-symmetric characteristics, its centroid and shear centre do not coincide. The LSBs can be used in floor systems as joists or bearers and in these applications they are often subjected to transverse loads that are applied away from the shear centre. Hence they are often subjected to combined bending and torsion actions. Previous researches on LSBs have concentrated on their bending or shear behaviour and strengths, and only limited research has been undertaken on their combined bending and torsion behaviour. Therefore in this research a series of nine experiments was first conducted on LSBs subject to combined bending and torsion. Three LSB sections were tested to failure under eccentric loading at mid-span, and appropriate results were obtained from seven tests. A special test rig was used to simulate two different eccentricities and to provide accurate simple boundary conditions at the supports. Finite element models of tested LSBs were developed using ANSYS, and the ultimate strengths, failure modes, and load-displacement curves were obtained and compared with corresponding test results. Finite element analyses agreed well with test results and hence the developed models were used in a parametric study to investigate the effects of load locations, eccentricities, and spans on the combined bending and torsion behaviour of LSBs. The interaction between the ultimate bending and torsional moment capacities was studied and a simple design rule was proposed. This paper presents the details of the tests, finite element analyses, and parametric study of LSBs subject to combined bending and torsion, and the results. © 2014 Elsevier Ltd.

Zhao W.,Wuhan University of Technology
Nature Nanotechnology | Year: 2016

How to suppress the performance deterioration of thermoelectric materials in the intrinsic excitation region remains a key challenge. The magnetic transition of permanent magnet nanoparticles from ferromagnetism to paramagnetism provides an effective approach to finding the solution to this challenge. Here, we have designed and prepared magnetic nanocomposite thermoelectric materials consisting of BaFe12O19 nanoparticles and Ba0.3In0.3Co4Sb12 matrix. It was found that the electrical transport behaviours of the nanocomposites are controlled by the magnetic transition of BaFe12O19 nanoparticles from ferromagnetism to paramagnetism. BaFe12O19 nanoparticles trap electrons below the Curie temperature (TC) and release the trapped electrons above the TC, playing an ‘electron repository’ role in maintaining high figure of merit ZT. BaFe12O19 nanoparticles produce two types of magnetoelectric effect—electron spiral motion and magnon-drag thermopower—as well as enhancing phonon scattering. Our work demonstrates that the performance deterioration of thermoelectric materials in the intrinsic excitation region can be suppressed through the magnetic transition of permanent magnet nanoparticles. © 2016 Nature Publishing Group

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.

Yi Z.,Wuhan University of Technology
Advanced Materials Research | Year: 2013

HOVF technology preparation of tungsten carbide coating, can be obtained the microhardness and neutral salt spray corrosion resistance superior to the protective layer of hard chrome plating, its own good toughness and high bonding strength of the matrix, itideal replacement for hard chrome plating technology. © (2013) Trans Tech Publications, Switzerland.

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.

Zhang J.,Wuhan University of Technology | Zhang J.,Huaibei Normal University | Zhou P.,Wuhan University of Technology | Liu J.,Huaibei Normal University | Yu J.,Wuhan University of Technology
Physical Chemistry Chemical Physics | Year: 2014

In general, anatase TiO2 exhibits higher photocatalytic activities than rutile TiO2. However, the reasons for the differences in photocatalytic activity between anatase and rutile are still being debated. In this work, the band structure, density of states, and effective mass of photogenerated charge carriers for anatase, rutile and brookite TiO2 are investigated by the first-principle density functional theory calculation. The results indicate that anatase appears to be an indirect band gap semiconductor, while rutile and brookite belong to the direct band gap semiconductor category. Indirect band gap anatase exhibits a longer lifetime of photoexcited electrons and holes than direct band gap rutile and brookite because the direct transitions of photogenerated electrons from the conduction band (CB) to valence band (VB) of anatase TiO2 is impossible. Furthermore, anatase has the lightest average effective mass of photogenerated electrons and holes as compared to rutile and brookite. The lightest effective mass suggests the fastest migration of photogenerated electrons and holes from the interior to surface of anatase TiO2 particle, thus resulting in the lowest recombination rate of photogenerated charge carriers within anatase TiO2. Therefore, it is not surprising that anatase usually shows a higher photocatalytic activity than rutile and brookite. This investigation will provide some new insight into understanding the difference of photocatalytic activity among anatase, rutile and brookite. © the Partner Organisations 2014.

Jia X.,Wuhan University of Technology | Yang Y.,Wuhan University of Technology
Optics and Lasers in Engineering | Year: 2012

Based on the extended HuygensFresnel integral and the beam coherencepolarization matrix, the analytical formulae for the average intensity and the degree of polarization of the radially polarized beams diffracted at a circular aperture in turbulent atmosphere are derived, which provide a convenient approach to study the propagation and polarization properties of the apertured radially polarized beams in turbulent atmosphere. The unapertured and free-space cases can be viewed as the special cases of our general result. The analyses indicate that the average intensity and the degree of polarization are closely related to the propagation distance, the structure constant of the atmospheric turbulence, and the truncation parameter. The existence of the circular aperture weakens the influence of the atmospheric turbulence on the evolution properties of the radially polarized beams. © 2012 Elsevier Ltd.

Yu J.,Wuhan University of Technology | Yu J.,King Abdulaziz University | Wang K.,Wuhan University of Technology | Xiao W.,Wuhan University | Cheng B.,Wuhan University of Technology
Physical Chemistry Chemical Physics | Year: 2014

Photocatalytic reduction of CO2 into renewable hydrocarbon fuels is an alternative way to develop reproducible energy, which is also a promising way to solve the problem of the greenhouse effect. In this work, graphitic carbon nitride (g-C3N4) was synthesized by directly heating thiourea at 550 °C and then a certain amount of Pt was deposited on it to form g-C3N4-Pt nanocomposites used as catalysts for photocatalytic reduction of CO2 under simulated solar irradiation. The main products of photocatalysis were CH4, CH3OH and HCHO. The deposited Pt acted as an effective cocatalyst, which not only influenced the selectivity of the product generation, but also affected the activity of the reaction. The yield of CH4 first increased upon increasing the amount of Pt deposited on the g-C3N4 from 0 to 1 wt%, then decreased at 2 wt% Pt loading. The production rates of CH 3OH and HCHO also increased with the content of Pt increasing from 0 to 0.75 wt% and the maximum yield was observed at 0.75 wt%. The Pt nanoparticles (NPs) could facilitate the transfer and enrichment of photogenerated electrons from g-C3N4 to its surface for photocatalytic reduction of CO2. At the same time, Pt was also used a catalyst to promote the oxidation of products. The transient photocurrent response further confirmed the proposed photocatalytic reduction mechanism of CO2. This work indicates that the deposition of Pt is a good strategy to improve the photoactivity and selectivity of g-C3N4 for CO2 reduction. © 2014 the Partner Organisations.

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.

Low J.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Li Q.,Wuhan University of Technology | Cheng B.,Wuhan University of Technology
Physical Chemistry Chemical Physics | Year: 2014

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.

Xiang Q.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Wang W.,Wuhan University of Technology | Jaroniec M.,Kent State University
Chemical Communications | Year: 2011

Nitrogen self-doped TiO2 nanosheets with exposed {001} facets (ca. 67%) were synthesized by solvothermal treatment of TiN in a HNO 3-HF ethanol solution and exhibited much higher visible-light photocatalytic H2-production activity than nitrogen doped TiO 2 microcrystallites with exposed {001} facets (ca. 60%) by a factor of 4.1. © 2011 The Royal Society of Chemistry.

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

Li X.,South China Agricultural University | Yu J.,Wuhan University of Technology | Yu J.,King Abdulaziz University | Jaroniec M.,Kent State University
Chemical Society Reviews | Year: 2016

As a green and sustainable technology, semiconductor-based heterogeneous photocatalysis has received much attention in the last few decades because it has potential to solve both energy and environmental problems. To achieve efficient photocatalysts, various hierarchical semiconductors have been designed and fabricated at the micro/nanometer scale in recent years. This review presents a critical appraisal of fabrication methods, growth mechanisms and applications of advanced hierarchical photocatalysts. Especially, the different synthesis strategies such as two-step templating, in situ template-sacrificial dissolution, self-templating method, in situ template-free assembly, chemically induced self-transformation and post-synthesis treatment are highlighted. Finally, some important applications including photocatalytic degradation of pollutants, photocatalytic H2 production and photocatalytic CO2 reduction are reviewed. A thorough assessment of the progress made in photocatalysis may open new opportunities in designing highly effective hierarchical photocatalysts for advanced applications ranging from thermal catalysis, separation and purification processes to solar cells. © 2016 The Royal Society of Chemistry.

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

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

Mai L.,Wuhan University of Technology | Mai L.,Harvard University | Dong Y.,Harvard University | Xu L.,Wuhan University of Technology | Han C.,Wuhan University of Technology
Nano Letters | Year: 2010

We report the single nanowire electrode devices designed as a unique platform for in situ probing the intrinsic reason for electrode capacity fading in Li ion based energy storage devices. In this device, a single vanadium oxide nanowire or single Si/a-Si core/shell nanowire was used as working electrode, and electrical transport of the single nanowire was recorded in situ to detect the evolution of the nanowire during charging and discharging. Along with lithium ion intercalation by shallow discharge, the vanadium oxide nanowire conductance was decreased over 2 orders. The conductance change can be restored to previous scale upon lithium ion deintercalation with shallow charge. However, when the nanowire was deeply discharged, the conductance dropped over 5 orders, indicating that permanent structure change happens when too many lithium ions were intercalated into the vanadium oxide layered structures. Different from vanadium oxide, the conductance of a single Si/a-Si core/shell nanowire monotonously decreased along with the electrochemical test, which agrees with Raman mapping of single Si/a-Si nanowire at different charge/discharge states, indicating permanent structure change after lithium ion insertion and extraction. Our present work provides the direct relationship between electrical transport, structure, and electrochemical properties of a single nanowire electrode, which will be a promising and straightforward way for nanoscale battery diagnosis. © 2010 American Chemical Society.

Mai L.,Wuhan University of Technology | Mai L.,Harvard University | Xu L.,Wuhan University of Technology | Han C.,Wuhan University of Technology | And 4 more authors.
Nano Letters | Year: 2010

Ultralong hierarchical vanadium oxide nanowires with diameter of 100-200 nm and length up to several millimeters were synthesized using the low-cost starting materials by electrospinning combined with annealing. The hierarchical nanowires were constructed from attached vanadium oxide nanorods of diameter around 50 nm and length of 100 nm. The initial and 50th discharge capacities of the ultralong hierarchical vanadium oxide nanowire cathodes are up to 390 and 201 mAh/g when the lithium ion battery cycled between 1.75 and 4.0 V. When the battery was cycled between 2.0 and 4.0 V, the initial and 50th discharge capacities of the nanowire cathodes are 275 and 187 mAh/g. Compared with self-aggregated short nanorods synthesized by hydrothermal method, the ultralong hierarchical vanadium oxide nanowires exhibit much higher capacity. This is due to the fact that self-aggregation of the unique nanorod-in-nanowire structures have been greatly reduced because of the attachment of nanorods in the ultralong nanowires, which can keep the effective contact areas of active materials, conductive additives, and electrolyte large and fully realize the advantage of nanomaterial-based cathodes. This demonstrates that ultralong hierarchical vanadium oxide nanowire is one of the most favorable nanostructures as cathodes for improving cycling performance of lithium ion batteries. © 2010 American Chemical Society.

Xie W.,Wuhan University of Technology | Xie W.,Clemson University | He J.,Clemson University | Kang H.J.,Clemson University | And 8 more authors.
Nano Letters | Year: 2010

Herein, we report the synthesis of multiscale nanostructured p-type (Bi,Sb)2Te3 bulk materials by melt-spinning single elements of Bi, Sb, and Te followed by a spark plasma sintering process. The samples that were most optimized with the resulting composition (Bi 0.48Sb1.52Te3) and specific nanostructures showed an increase of ∼50% or more in the figure of merit, ZT, over that of the commercial bulk material between 280 and 475 K, making it suitable for commercial applications related to both power generation and refrigeration. The results of high-resolution electron microscopy and small angle and inelastic neutron scattering along with corresponding thermoelectric property measurements corroborate that the 10-20 nm nanocrystalline domains with coherent boundaries are the key constituent that accounts for the resulting exceptionally low lattice thermal conductivity and significant improvement of ZT. © 2010 American Chemical Society.

Mai L.,Wuhan University of Technology | Mai L.,Harvard University | Xu L.,Wuhan University of Technology | Gao Q.,Wuhan University of Technology | And 3 more authors.
Nano Letters | Year: 2010

We report the electrical transport and H2S sensing properties of single β-AgVO3 nanowire device. β-AgVO3 nanowires were successfully prepared by ultrasonic treatment followed by hydrothermal reaction using V2O5 sol. The individual β-AgVO3 nanowire exhibits a "threshold switching" phenomenon. High bias (i.e., 6 V for Au contacts) is required to initially switch the individual nanowire device from nonconductive to conductive, and it may be related to the formation of nanoscale metallic Ag when enough voltage is applied between the two electrodes. This novel nanomaterial shows good H 2S sensing performances with short response and recovery time within 20 s, relatively low response concentration of 50 ppm, and good selectivity. © 2010 American Chemical Society.

Wang L.,Wuhan University of Technology | Xiang Y.,Wuhan University of Technology
Advanced Materials Research | Year: 2013

Elastic-plastic deformation analysis of the deformable sphere and the rigid plane was studied using the finite element software,this paper was focused on the impact of the friction effects on the deformation of the elastic-plastic deformation under considering the material strain stiffening properties,studies have shown that, the strain stiffening feature increases the contact load while reducing the contact area, the friction effect reduce both the contact load and contact area during elastic-plastic deformation process of the deformable sphere with increasing contact interference. © (2013) Trans Tech Publications, Switzerland.

Xiang Q.,Wuhan University of Technology | Yu J.,Wuhan University of Technology
Cuihua Xuebao/Chinese Journal of Catalysis | Year: 2011

The fabrication of well defined hierarchical structures of anatase TiO 2 with a high percentage of reactive facets is of great importance and challenging. Hierarchically flower-like TiO 2 superstructures (HFTS) self-assembled from anatase TiO 2 nanosheets with exposed {001} facets (up to 87%) were synthesized by a simple alcohothermal strategy in a HF-H 2O-C 2H 5OH mixed solution using titanate nanotubes as precursor. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N 2 adsorption-desorption isotherms. The photocatalytic activity was evaluated by the photocatalytic oxidation decomposition of acetone in air and methyl orange in aqueous solution under UV illumination. The photocatalytic activity of HFTS was much higher than that of commercial Degussa P25 and tabular-shaped anatase TiO 2 obtained using pure water as the synthesis medium. The enhancement in photocatalytic activity was related to several factors, including the hierarchically porous structure, exposed {001} facets, and increased light harvesting ability. The HFTS was also of interest for use in solar cells, photocatalytic H 2 production, optoelectronic devices, sensors, and catalysis.

Fu J.,Wuhan University of Technology | Cao S.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Yu J.,King Abdulaziz University | And 2 more authors.
Dalton Transactions | Year: 2014

Photocatalytic reduction of CO2 into renewable hydrocarbon fuels using semiconductor photocatalysts is considered as a potential solution to the energy deficiency and greenhouse effect. In this work, mesoporous TiO 2 nanofibers with high specific surface areas and abundant surface hydroxyl groups are prepared using an electrospinning strategy combined with a subsequent calcination process, followed by a solvothermal treatment. The solvothermally treated mesoporous TiO2 nanofibers exhibit excellent photocatalytic performance on CO2 reduction into hydrocarbon fuels. The significantly improved photocatalytic activity can be attributed to the enhanced CO2 adsorption capacity and the improved charge separation after solvothermal treatment. The highest activity is achieved for the sample with a 2-h solvothermal treatment, showing 6- and 25-fold higher CH4 production rate than those of TiO2 nanofibers without solvothermal treatment and P25, respectively. This work may also provide a prototype for studying the effect of solvothermal treatment on the structure and photocatalytic activity of semiconductor photocatalysts. © the Partner Organisations 2014.

Yang M.,Wuhan University of Technology | Dai J.,Wuhan University of Technology
Photonic Sensors | Year: 2014

Hydrogen is one of the next generation energies in the future, which shows promising applications in aerospace and chemical industries. Hydrogen leakage monitoring is very dangerous and important because of its low ignition energy, high combustion efficiency, and smallest molecule. This paper reviews the state-of-art development of the fiber optic hydrogen sensing technology. The main developing trends of fiber optic hydrogen sensors are based on two kinds of hydrogen sensitive materials, i.e. palladium-alloy thin films and Pt-doped WO3 coatings. In this review work, the advantages and disadvantages of these two kinds of sensing technologies will be evaluated. © 2014, The Author(s).

Xu F.,Wuhan University of Technology | Mu S.,Wuhan University of Technology
Journal of Nanoscience and Nanotechnology | Year: 2014

This review reports on the functions and applications of nanoceramic oxides in proton exchange membrane fuel cells (PEMFCs). Such materials are mainly used as fillers to enhance the water uptake and proton conductivity of polymeric matrices at high temperatures under low relative humidity. To further enhance the mechanical property of proton exchange membranes (PEMs), the functionalized ceramic oxides with organic groups are introduced. Furthermore, the inorganic PEMs are developed to improve their proton conductivities at elevated temperatures. Due to the inherent disadvantages of polymeric PEMs, it is believed that the inorganic PEMs based on porous ceramic oxides are a promising new candidate as solid electrolyte membranes in PEMFCs at high temperatures and with low relative humidity. © 2014 American Scientific Publishers.

Xi S.-E.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

Nodes importance evaluation is the element of transportation network planning. From the aspects of society and economy, highway traffic volume, traffic location, an evaluation system on nodes importance and traffic loLPcation of Highway Transportation Junction is established. For the accuracy of evaluation, Fuzzy-AHP is applied to calculate weight of each indicator as fuzziness is existed when factors are compared mutually. Besides, case study is made on SHANDONG province, results demonstrate that it is scientific and feasible for planning of highway transportation hubs. © (2013) Trans Tech Publications, Switzerland.

Xi S.-E.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

With the rapid development of highway construction, quickly increasing passenger traffic demand, the importance of layout planning of highway passenger terminal is becoming more obvious. Based on analyzing the forming mechanism of a passenger transport hub, an evaluation indicator system was established for a comprehensive transport hub from the perspectives of transport demand and supply. For overcoming the subjectivity, entropy theory was applied to determine the various indicator weights with fuzzy evaluation model. Finally, the indicator system and fuzzy entropy weight method were applied in Jiangsu province as a case study. © (2013) Trans Tech Publications, Switzerland.

Huaqin Z.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

Investment in transportation infrastructure is bound to promote the economic development. Coordinated development of transport and economy is the best state. This paper discusses the principle of coordinated development between traffic and economy, build evaluation index system of transport and economy development, use entropy weight method to calculate the composite score, draw traffic - economy coordination degree model. Then set Huanggang City of Hubei province example to illustrate the usefulness of the model. © (2013) Trans Tech Publications, Switzerland.

Luo Y.,Wuhan University of Technology
Mathematical Problems in Engineering | Year: 2016

Concentrating on the convergence analysis of Genetic Algorithm (GA), this study originally distinguishes two types of advantage sources: value advantage and relationship advantage. Accordingly, the quantitative feature, complete quantization feature, and the partial quantization feature in the fitness evaluation are proposed. Seven simulation experiments show that these two types of advantages have different convergence properties. For value advantage problems, GA has a good convergence. However, for a relationship advantage problem, only from the practical point of view, it is possible to get a feasible and even satisfactory solution through large-scale searching, but, in theory, however, the searching process is not convergent. Therefore, GA is not reliable to solve relationship advantage problems, to which most engineering problems involving combinatorial optimization belong. This study systematically shows convergence properties of "relationship advantage" through simulation experiments, which will be a new area for the further study on GA. © 2016 Yabo Luo.

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.

Liu J.,Wuhan University of Technology | Zhang G.,Wuhan University of Technology
Physical Chemistry Chemical Physics | Year: 2014

Clay materials including clay minerals and layered double hydroxides (LDHs) have attracted great attention because of their special layer structures, large specific surface areas, and remarkable adsorption capacities. In the past few decades, they have been regarded as important components or precursors for making various functional materials. This paper aims to review and summarize the recent advances in the synthesis and photocatalytic applications of clay-based photocatalysts. Moreover, the effects of surface and structural characteristics of clay-based photocatalysts on photocatalytic properties are also discussed. The clay-based photocatalysts show good application prospects for environmental remediation and energy conversion. Especially, H2 generation and reduction of CO2 into carbon sources can be easily achieved using the LDH-based photocatalysts. Meanwhile, the role of clay materials in the photocatalysis is discussed in detail. © 2014 the Owner Societies.

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.

Ji X.B.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

To study the current state of the Earth's health, we divide the Earth into dozens of regions and construct a complex network. Based on the network, we analyze the Earth's present health and predict its developing trend. Moreover, the reasonable health level of the Earth can be reached via pinning control. Taking the population for example, we analyze the trend of population in the dynamic network both with control and without control. The results indicate that human behaviors and government policies have great impact on population growth. © 2013 Trans Tech Publications Ltd, Switzerland.

Zhou Q.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

While colleges and universities are actively promoting a curriculum reform in physical education and making an adjustment of structure of physical education curriculum, they use ASP.NET technology and Web database technology to study the construction of evaluation information system based on B/S Model and scientifically evaluate teaching quality of physical education curriculum of ordinary universities in order to examine whether the universities have formed the teaching features of "Three-autodidacticism" of physical education teaching in accordance with the requirements of university credit system, establish a guiding ideology of "Health First" and make optional courses teaching model the main approaches and means, which finally builds a foundation for improving the teaching effects of physical education, strengthening the teaching ability and comprehensive quality of teachers, improving the position of physical education curriculum in colleges and universities and cultivating students' lifelong health awareness and their development in an all-around way. © 2013 Trans Tech Publications Ltd, Switzerland.

Duan J.,Wuhan University of Technology | Shi W.,Wuhan University of Technology | Xu L.,Wuhan University of Technology | Mou G.,Wuhan University of Technology | And 2 more authors.
Chemical Communications | Year: 2012

The hydrolysis of H 2TaF 7 when it slowly forms via etching Ta powders with HF and H 2O 2 under hydrothermal conditions produces hierarchical nanostructures of fluorinated and naked Ta 2O 5 single-crystalline nanorods, which exhibit a far greater photocatalytic activity for H 2 production than commercial Ta 2O 5 particles. © 2012 The Royal Society of Chemistry.

Xiang Q.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Jaroniec M.,Kent State University
Chemical Society Reviews | Year: 2012

Graphene, a single layer of graphite, possesses a unique two-dimensional structure, high conductivity, superior electron mobility and extremely high specific surface area, and can be produced on a large scale at low cost. Thus, it has been regarded as an important component for making various functional composite materials. Especially, graphene-based semiconductor photocatalysts have attracted extensive attention because of their usefulness in environmental and energy applications. This critical review summarizes the recent progress in the design and fabrication of graphene-based semiconductor photocatalysts via various strategies including in situ growth, solution mixing, hydrothermal and/or solvothermal methods. Furthermore, the photocatalytic properties of the resulting graphene-based composite systems are also discussed in relation to the environmental and energy applications such as photocatalytic degradation of pollutants, photocatalytic hydrogen generation and photocatalytic disinfection. This critical review ends with a summary and some perspectives on the challenges and new directions in this emerging area of research (158 references). © 2012 The Royal Society of Chemistry.

Xie G.,Wuhan University of Technology
Procedia Engineering | Year: 2011

The match of ship, engine and propeller is one of the most important problems in ship conceptual design. The propeller design in conceptual design stage is a multi-objective optimization problem. The objectives are efficiency ratio and thrust coefficient. A multi-objective optimization approach is proposed for propeller preliminary design in present study. A Non-dominated Sorting Genetic Algorithm II (NSGA II) is employed to approximate the set of Pareto solution through an evolutionary optimization process. Then a decision making approach is adopted to select "best" solution. A B-propeller design example is conducted to illustrate the analysis process in present work. © 2010 Published by Elsevier Ltd.

Zhang H.,Hunan University | Jia X.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Xue L.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

Organic expanded vermiculites (OEVMTs) were prepared using cetyltrimethyl ammonium bromide (CTAB) and octadecyl dimethyl benzyl ammonium chloride (ODBA) as intercalation agents. Effect of EVMT organic modification on physical and aging properties of styrene-butadiene-styrene (SBS) modified bitumen was investigated. The microstructures of the binders were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. EVMT/SBS modified bitumen forms a phase-separated structure, while OEVMT/SBS modified bitumens form the exfoliated nanostructures according to XRD analysis. OEVMTs show the more obvious influence on physical properties of SBS modified bitumen in comparison with EVMT. The compatibility between the EVMT and SBS modified bitumen is also improved after organic modification of EVMT. AFM analysis indicates that the contrast between the dispersed phase and the matrix phase in SBS modified bitumen increases with the addition of ODBA-EVMT. As a result of thin film oven test (TFOT), the viscosity aging index of SBS modified bitumen decreases, while the retained ductility and penetration increase obviously with the introduction of EVMT and OEVMTs. ODBA-EVMT/SBS modified bitumen has more pronounced improvements in aging resistance of SBS modified bitumen in comparison with CTAB-EVMT/SBS modified bitumen by preventing the phase-separated trend of the SBS modified bitumen during TFOT. © 2012 Elsevier Ltd. All rights reserved.

Liu S.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Cheng B.,Wuhan University of Technology | Jaroniec M.,Kent State University
Advances in Colloid and Interface Science | Year: 2012

Semiconductor photocatalysts are of great significance in solar energy conversion and environmental remediation. To overcome serious drawbacks of these materials with respect to narrow light-response range and low quantum efficiency, a variety of strategies have been developed in the past decades to enhance the light harvesting and excitation as well as the charge transfer against recombination. In particular, fluorination of semiconductor photocatalysts can be employed to modify their surface and bulk properties, and consequently, to enhance their photocatalytic performance. This review presents a comprehensive description of the F-mediated synthesis and unique properties of fluorinated semiconductor photocatalysts, in particular titanium dioxide (TiO 2). The available strategies for the synthesis of fluorinated photocatalysts include post-synthesis fluorination and in-situ fluorination. Depending on the synthesis route and conditions, it is possible to control the chemical nature of incorporated fluorine (such as adsorbed fluoride and lattice-doped fluorine) and the fluoride-mediated crystal modification and organization, which often results in exceptional surface and bulk physicochemical properties, giving rise to unique photocatalytic properties. Significantly, the surface fluorination induces unusual adsorption behavior and interfacial charge transfer dynamics, directly affecting photocatalytic redox properties of the surface-fluorinated photocatalysts. The lattice fluorine-doping, sole or cooperative with other complementary co-dopants, introduces special localized electronic structures and surface defect states, accounting for the exceptional visible-light photoactivity of the fluorine-doped photocatalysts. Finally, recent advances in the synthesis and properties of fluorinated photocatalysts are summarized along with perspectives on further developments in this area of research. © 2012 Elsevier B.V. All rights reserved.

Yang M.,Wuhan University of Technology | Dai J.,Wuhan University of Technology
Photonic Sensors | Year: 2012

The combination of fiber optics with nano-structure technologies and sensitive thin films offers great potential for the realization of novel sensor concepts. Miniatured optical fiber sensors with thin films as sensitive elements could open new fields for optical fiber sensor applications. Thin films work as sensitive elements and transducer to get response and feedback from environments, in which optical fibers are employed to work as signal carrier. This article presents some research work conducted at the National Engineering Laboratory for Optical Fiber Sensing Technologies in recent years. Concrete examples are: Pd/WO3 co-sputtered coating as sensing material for optical hydrogen sensors shows robust mechanical stability and meanwhile good sensing performance; TbDyFe magnetostrictive coating directly deposited on fiber Bragg grating (FBG) demonstrates its possibility of miniature optical magnetic field/current sensors, and 40-pm shift of the FBG wavelength happens at a magnetic field order of 50 mT. © The Author(s) 2011.

Shi J.,Wuhan University of Technology
Chemical Engineering Transactions | Year: 2016

This paper puts forward a power cable on-line measurement system which is based on fiber Bragg grating. Firstly the paper analyzes several solutions to cable lines temperature measurement, then the best solution to cable temperature measurement should be chosen from characters and defects of these temperature measurements. Due to the characters and merits of fiber Bragg grating such as high sensitivity, insensitive to the electromagnetic interference and lower cost than BOTDR, a cable lines temperature measurement which is based on fiber Bragg grating has been applied to engineering application. On the basis of temperature measurement principle of fiber Bragg Grating, the power cable on-line measurement system consists of FBG sensing system, FBG demodulator, multi-channels wireless acquisition and transmission terminal, and data publishing system. This measurement accuracy is relatively high, the temperature test in laboratory across cable line is analyzed, the maximum absolute error is 0.05°C; the maximum relative error is 0.2%. Moreover, a long period of time and multiple channels engineering application, the monitoring system proposed in the paper provides a feasible scheme for the on-line monitoring of underground and submarine cable. All the results shows that the fiber Bragg grating sensing system could be used for the on-line temperature monitoring on the power transmission lines and provide technical support for the smart grid, and this FBG online monitoring system will have a broad prospect in engineering application. Copyright © 2016, AIDIC Servizi S.r.l.

Abebe M.S.,Wuhan University of Technology | Qiu H.S.,Wuhan University of Technology
Electronic Journal of Geotechnical Engineering | Year: 2016

In recent years it has become evident that high speed trains can cause severe track-settlement problems along certain sections of high speed train lines. The dynamic loading that occurs during the passage of high-speed trains leads to degradation of the ballast and underlying layers. We used LS-DYNA software to analyze the impact of high-speed train load on a reinforced ballasted rail line, using non-reinforced ballasted rail line as a control. LS-DYNA is powerful finite element software that enables the modeling of parameters including static and dynamic load, traffic line, contacts, boundary conditions, materials, and element types. The velocity of the train was defined as PRESCRIBED MOTION, the static load was defined as LONDE_NODE SET, and the traffic line was defined as RAIL_TRACK and RAIL_TRAIN. The contacts between parts, segments, and nodes of the high-speed ballasted rail track were defined as CONTACT SINGLE SURFACE, CONTACT SURFACE_SURFACE, and CONTACT FORCED TRANDUCER PENALTY, respectively. The result show that the deformation rate for reinforced ballasted rail track is 24% less than that for the non-reinforced ballasted track. Furthermore, the stress state of the reinforced ballasted track is 70% less than that for the non-reinforced ballasted track. Similarly, the strain state of the reinforced ballasted track containing geotextile between the sub-ballast and the subgrade is 76% less than that of the non-reinforced ballasted track. The results indicate that geotextile reinforcement can be used to strengthen weak, soft subgrade ballasted railway tracks. © 2016 ejge.

Jiao X.,Wuhan University of Technology | Jiao X.,Jiangxi University of Science and Technology | Zhang Y.,Wuhan University of Technology | Chen T.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

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.

Song Y.,Wuhan University of Technology
Procedia Engineering | Year: 2011

Sustainable development is a new concept of scientific development, sustainable development requires us to change not only the concept of economic development, but also requires us to change the concept of social development. Development of the city as a social development and economic development is an important embodiment of the process of sustainable development but also in pursuit of the concept of innovation. In this paper, the basic problem of the construction of ecological city, from the basic principles of eco-city construction, the city's main content and ecological function zoning. On this basis, the paper studied the ecological city and the relationship between sustainable development. Hope that through this research for ecological building and sustainable development of the city to provide a reference. © 2011 Published by Elsevier Ltd.

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.

Chen J.-L.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

As people's life style, living environment, and nutritional and dietary pattern change, noninfectious chronic diseases have become common and frequently occurring diseases.In recent years, detection rate of chronic diseases in university teachers increases as time goes by and their health status is not optimistic. This paper summarizes documents illustrating the foregoing issue and indicates that hyperlipemia, hypertension and hyperglycemia etc. have become principal risk factors threatening the health of university teachers and staff members. Hyperlipemia, hypertension and hyperglycemia etc. are closely related with chronic diseases such as cardio-cerebrovascular disease and they interact as both cause and effect.Changing unhealthy life style and reducing blood lipid, blood pressure and blood glucose to normal level is critical to prevent cardio-cerebrovascular diseases, which is also important to prevent diseases among knowledgeable people. © (2014) Trans Tech Publications, Switzerland.

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.

Li Z.Q.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

Quality is the lifeline of business, and the key point of product's quality is the product design quality. In recent years, the quality problems of car products have lingered on, and the large part is brought by the risk of product design quality. Beginning with quality gates, which is a world leading product quality management mode, this article is emphasized on the design quality risk control's principles and methods of car products. © (2014) Trans Tech Publications, Switzerland.

Li G.,University of Oxford | Li G.,Wuhan University of Technology | Shih S.-J.,University of Oxford | Fu Z.,Wuhan University of Technology
Chemical Communications | Year: 2010

High quality nonpolar m-plane GaN films were successfully grown on LiGaO2 (100) substrates for the first time. This m-plane GaN/LiGaO2 (100) system opens a new approach for realizing highly-efficient nitride devices. © 2010 The Royal Society of Chemistry.

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.

Mi-Tang W.,Wuhan University of Technology | Mi-Tang W.,Inner Mongolia University of Science and Technology | Jin-Shu C.,Wuhan University of Technology
Journal of Alloys and Compounds | Year: 2010

Viscosity, coefficient of thermal expansion, glass transition temperature and dilatometric softening temperature of soda-lime-silicate glass doped with rare earth oxides (La 2O 3, CeO 2, Nd 2O 3) were investigated by the rotating crucible viscometer and dilatometry, the melting temperature and activation energy for viscous flow of the studied melt were derived on the basis of Arrhenius equation, in order to reveal the effects of rare earth elements on the behavior of soda-lime-silicate glass. The results show that introduction of rare earth oxides increases the coefficient of thermal expansion, decreases viscosity of soda-lime-silicate glass, and Nd 2O 3 is an exception in viscosity. The glass transition temperature, dilatometric softening temperature, melting temperature and activation energy for viscous flow of soda-lime-silicate glass doped with rare earth oxides increase with increasing cationic field strength of corresponding rare earth ions. © 2010 Elsevier B.V. All rights reserved.

Liu S.,Wuhan University of Technology | Zhang Y.,Wuhan University of Technology | Han H.,Wuhan University of Technology
Journal of Alloys and Compounds | Year: 2010

A novel Mg-50% Al4C3 (hereafter in wt.%) master alloy has been developed by powder in situ synthesis process, the role of manganese on the grain refining efficiency of AZ91D magnesium alloy refined by this master alloy has been investigated. X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS) results show the existence of Al4C3 particles in this master alloy. After addition of 0.6% Al4C3 or combined addition of 0.6% Al4C3 and 0.27% Mn, the average grain size of AZ91D decreased dramatically from 360 μm to 210 μm, and from 360 μm to130 μm, respectively. However, no further refinement of grain size was achieved with additional amount of Mn exceeding 0.27% for AZ91D alloy refined by 0.6% Al4C3 in the present investigation. Al-C-O-Mn-Fe-rich intermetallic particles with an Al-C-O-rich coating film, often observed in the central region of magnesium grains of the AZ91D alloy treated by the combination of Al4C3 and Mn, are proposed to be the potent nucleating substrates for primary α-Mg. © 2009 Elsevier B.V. All rights reserved.

Yu J.,Wuhan University of Technology | Hai Y.,Wuhan University of Technology | Jaroniec M.,Kent State University
Journal of Colloid and Interface Science | Year: 2011

Efficient hydrogen production and decomposition of glycerol were achieved on CuO-modified titania (CuO-TiO2) photocatalysts in glycerol aqueous solutions. CuO clusters were deposited on the titania surface by impregnation of Degussa P25 TiO2 powder (P25) with copper nitrate followed by calcination. The resulting CuO-TiO2 composite photocatalysts were characterized by X-ray diffraction (XRD), UV-visible spectrophotometry, X-ray photoelectron spectroscopy (XPS), N2 adsorption-desorption, transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. The low-power ultraviolet light emitting diodes (UV-LED) were used as the light source for photocatalytic H2-production reaction. A detailed study of CuO effect on the photocatalytic H2-production rates showed that CuO clusters can act as an effective co-catalyst enhancing photocatalytic activity of TiO2. The optimal CuO content was found to be 1.3wt.%, giving H2-production rate of 2061μmolh-1g-1 (corresponding to the apparent quantum efficiency (QE) of 13.4% at 365nm), which exceeded the rate of pure TiO2 by more than 129 times. The quantum size effect of CuO clusters is deemed to alter its energy levels of the conduction and valence band edges in the CuO-TiO2 semiconductor systems, which favors the electron transfer and enhances the photocatalytic activity. This work shows not only the possibility of using CuO clusters as a substitute for noble metals in the photocatalytic H2-production but also demonstrates a new way for enhancing hydrogen production activity by quantum size effect. © 2011 Elsevier Inc.

Yang M.,Wuhan University of Technology
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2016

Nano-sized Mg2Si powder was prepared by mechanical milling micro-sized Mg2Si which was obtained from Mg and Si powder. The analysis about milling mediator, ratio of grinding media to material, rotational speed and time indicated that nano-size Mg2Si powder can be successfully obtained by mechanical milling method with the ration of grinding media to material was 20:1, rotation of 370 r/min, and 70h. According to the lattice scattering, Nano-sized Mg2Si own lower thermal and electrical conductivity but higher Seebeck coefficient. Taken all of the three factors into consideration, nano-sized Mg2Si obtained higher ZT of 0.36 at 800 K, which was much higher than that of micro-sized Mg2Si material. © 2016, University of Science and Technology Beijing. All right reserved.

Yu J.,Wuhan University of Technology | Li Q.,Wuhan University of Technology | Fan J.,Wuhan University of Technology | Cheng B.,Wuhan University of Technology
Chemical Communications | Year: 2011

Hierarchically macro-/mesoporous titanate tubular structures (HTT) self-assembled by nanotubes and nanosheets were fabricated by hydrothermal treatment of titanate glycolate rods in 0.1 M NaOH aqueous solution. Double-layered dye-sensitized solar cells (DSSCs) composed of a P25 nanoparticle (NP) underlayer and a tubular TiO2 overlayer demonstrated an enhanced photovoltaic conversion efficiency of 6.2%. © 2011 The Royal Society of Chemistry.

Xiang Q.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Jaroniec M.,Kent State University
Chemical Communications | Year: 2011

TiO2 films composed of flower-like TiO2 microspheres with exposed {001} facets were synthesized by a simple one-pot hydrothermal method and exhibited tunable photocatalytic selectivity towards decomposition of azo dyes in water by modifying the surface of TiO2 microspheres as well as by varying the degree of etching of {001} facets. © 2011 The Royal Society of Chemistry.

Li Q.,CAS National Center for Nanoscience and Technology | Li Q.,Wuhan University of Technology | Guo B.,CAS National Center for Nanoscience and Technology | Yu J.,Wuhan University of Technology | And 4 more authors.
Journal of the American Chemical Society | Year: 2011

The production of clean and renewable hydrogen through water splitting using photocatalysts has received much attention due to the increasing global energy crises. In this study, a high efficiency of the photocatalytic H 2 production was achieved using graphene nanosheets decorated with CdS clusters as visible-light-driven photocatalysts. The materials were prepared by a solvothermal method in which graphene oxide (GO) served as the support and cadmium acetate (Cd(Ac)2) as the CdS precursor. These nanosized composites reach a high H2-production rate of 1.12 mmol h -1 (about 4.87 times higher than that of pure CdS nanoparticles) at graphene content of 1.0 wt % and Pt 0.5 wt % under visible-light irradiation and an apparent quantum efficiency (QE) of 22.5% at wavelength of 420 nm. This high photocatalytic H2-production activity is attributed predominantly to the presence of graphene, which serves as an electron collector and transporter to efficiently lengthen the lifetime of the photogenerated charge carriers from CdS nanoparticles. This work highlights the potential application of graphene-based materials in the field of energy conversion. © 2011 American Chemical Society.

Yu J.,Wuhan University of Technology | Li Q.,Wuhan University of Technology | Shu Z.,Wuhan University of Technology
Electrochimica Acta | Year: 2011

Dye-sensitized solar cells (DSSCs) are fabricated based on double-layered composite films of TiO2 nanoparticles and hollow spheres. The photoelectric conversion performances of DSSCs based on nanoparticles/ nanoparticles (PP), hollow spheres/hollow spheres (HH), hollow spheres/nanoparticles (HP), and nanoparticles/hollow spheres (PH) double-layered films are investigated, and their photo-electric conversion efficiencies are 4.33, 4.72, 4.93 and 5.28%, respectively. The enhanced performance of TiO 2 nanoparticles/hollow spheres double-layered composite film solar cells can be attributed to the combined effect of following factors. The light scattering of overlayer hollow spheres enhances harvesting light of the DSSCs and the underlayer TiO2 nanoparticle layer ensures good electronic contact between film electrode and the F-doped tin oxide (FTO) glass substrate. Furthermore, the high surface areas and pore volume of TiO2 hollow spheres are respectively beneficial to adsorption of dye molecules and transfer of electrolyte solution. © 2011 Elsevier Ltd. All rights reserved.

Wang X.,Wuhan University of Technology | Li S.,Wuhan University of Technology | Yu H.,Wuhan University of Technology | Yu J.,Wuhan University of Technology
Journal of Molecular Catalysis A: Chemical | Year: 2011

Usually, it is difficult to get small AgCl nanoparticles by a conventional aqueous solution route owing to their high nucleation and growth rate. In this study, AgCl nanoparticles with a diameter of less than 30 nm were uniformly coated on the surface of Ag8W4O16 nanorods to form Ag8W4O16/AgCl-nanoparticle core-shell heterostructures by a simple in situ anion-exchange route. It was found that the ion exchange reaction between Cl- and WO4 2- ions was preferable to occur on the surface of Ag8W4O 16 nanorods rather than in the bulk solution, resulting in the formation of core-shell nanorods. The AgCl shell layer could be easily controlled by adjusting the concentration of NaCl solution. With increasing NaCl concentration, more Ag8W4O16 phase in the core transferred into AgCl-nanoparticle shell layer while the total size of the core-shell nanorods almost remained unchanged. The photocatalytic activity experiments of methyl orange aqueous solution under fluorescence light irradiation indicated that the AgCl nanoparticles coated on the surface of Ag8W4O16 nanorods, which could be readily separated from a slurry system after photocatalytic reaction, exhibited a much higher photocatalytic activity than the bulk AgCl photocatalyst. © 2010 Elsevier B.V. All rights reserved.

Wang K.,Wuhan University of Technology | Liu Q.,Wuhan University of Technology | Lau F.C.M.,Hong Kong Polytechnic University
IEEE Transactions on Vehicular Technology | Year: 2013

We consider the scenario of a cognitive radio network overlaying on top of a legacy primary network by overhearing feedback signals over primary channels. The considered problem can be cast into a restless multiarmed bandit (RMAB) problem that is of fundamental importance in decision theory. It is well known that the optimal policy of the RMAB problem is PSPACE-hard to obtain due to its exponential computation complexity. A natural alternative is to consider an easily implementable myopic policy that maximizes immediate reward but ignores the impact of the current strategy on future reward. In this paper, we perform an analytical study on the structure, optimality, and performance of the myopic policy for the considered RMAB problem. The myopic policy is shown to have a simple queue structure, and then, its optimality is established for accessing N-1 of N channels and conjectured for the general case. The performance of the myopic policy is analyzed, which, based on the structure of the myopic policy and the domination theory, characterizes the lower and upper bounds of the throughput of a multichannel opportunistic communication system. © 2013 IEEE.

Zhi L.H.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

This paper present some selected results of wind tunnel tests carried out on a typical super-tall building The variations of wind loads in the three orthogonal directions with wind attack direction were evaluated. The cross-correlations among various wind loading components were presented and discussed in detail. Furthermore, the across-wind spectral characteristics were studied and an empirical formula for estimation of the across-wind overturning moment spectrum for the super-tall building is presented. The output of this study is expected to be of considerable interest and practical use to professionals and researchers involved in the design of super-tall buildings. © (2013) Trans Tech Publications, Switzerland.

Yaotian F.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

Planning entrance fairway is a key factor for building a sea port. Generally the quantitative and qualitative analysis on planning the entrance fairway is mainly based on the standards and regulations given by the administrations. However, these standards and regulations only deal with the respective factor but cannot cover synthetic respect of considering the project feasibility. Moreover it is very tough to do a real-ship trial for a planned entrance fairway. In this paper, maritime simulator is used for optimizing the planning of entrance fairway for Fujian LNG terminal. The outcome indicates that the width of the fairway can meet the requirement of Q-Flex LNG carrier entering the port and it is suggested to do more sweeping survey and set some aids to navigation for the planned waterway. © (2013) Trans Tech Publications, Switzerland.

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

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.

Hu K.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2013

Interchange is the important conversion node of freeway. In the process of Interchange reconstruction and expansion, how to ensure the traffic of Interchange in all directions operate normally, to reduce the impact of the construction on traffic flow and to ensure the security of the roads traffic flow smoothly is very crucially. Through analyzing the characteristics of the driver, road and traffic flow, to study and determine the Interchange situ reconstruction and expansion traffic organization plan and security measures during construction traffic organization. © (2013) Trans Tech Publications, Switzerland.

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.

Yu J.,Wuhan University of Technology | Tao H.,Wuhan University of Technology | Cheng B.,Wuhan University of Technology
ChemPhysChem | Year: 2010

A new optical probe in catalysis: The detection of the surface coverage of reactants on the surface of nanosized catalysts by manipulating nanoscale LSPR optical probes, as demonstrated by Larsson and co-workers, opens up new avenues for in situ investigation of the kinetics and mechanism of heterogeneous catalytic reactions (see picture). © 2010 Wiley-VCH Verlag GmbH & Co.

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.

Li J.,Wuhan University of Technology | Shi C.,Wuhan University of Technology | Kong X.,Wuhan University of Technology | Li X.,Wuhan University of Technology | Wu W.,Wuhan University of Technology
Composite Structures | Year: 2013

The natural frequencies, mode shapes and buckling loads of the laminated composite beams subject to concentrated axial forces are investigated on the basis of hyperbolic shear deformation theory. In the analysis the effects of axial force, Poisson effect, shear deformation, rotary inertia and coupling between axial and transverse deformations are taken into account. The spectral finite element method is adopted with particular reference to the Wittrick-Williams algorithm when investigating the free vibration of axially loaded composite beams. The exact spectral element matrix is established by directly solving the governing differential equations of the laminated beams in free vibration. Two illustrative examples are worked out to show the influences of axial force and boundary condition on the free vibration and buckling behaviors of the laminated composite beams. Comparison with the available solutions in the literature demonstrates the accuracy and reliability of the proposed formulation. © 2012 Elsevier Ltd.

Gao T.H.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

The text gives a detailed description of control strategy over power synthesis device with hydraulic energy-saving technology, allocates power for combination drive system during different work procedures reasonably and provides theoretical basis for research of power synthesis technology in the future. © (2014) Trans Tech Publications, Switzerland.

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

Introduced the essential construction craft of Nanchang Shengmi bridge (75+2×228+75m center bearing type steel tube concrete tie bar arched bridge). According to the construction craft and the quality specification request, discussed the steel arched bridge manufacture and the anticorrosion, the steel arched bridge rib erects, the steel arched bridge rib welding, the steel arched bridge in concrete configuration and the scene constructs, the steel tube protection coating construction, then proposed the construction quality control of large span steel tube concrete arch bridge. The conclusion of the article may be used at the similar steel tube concrete arched bridge construction. © (2014) Trans Tech Publications, Switzerland.

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.

Liu T.-G.,Xinxiang Medical University | Zhang W.-Q.,Henan Institute of Science and Technology | Li Y.-L.,Wuhan University of Technology
Frontiers of Physics | Year: 2014

The structure, electronic and magnetic properties of HoSin(n = 1-12, 20) clusters have been widely investigated by first-principles calculation method based on density functional theory (DFT). From our calculation results, we find that for HoSin(n = 1-12) clusters except n = 7, 10, the most stable structures are a replacement of Si atom in the corresponding pure Sin+1 clusters by Ho atom. The doping of Ho atom makes the stability of Si clusters enhance remarkably, and HoSin(n = 2, 5, 8, 11) clusters are more stable than their neighboring clusters. The magnetic moment of Ho atom in HoSin(n = 1-12, 20) clusters mainly comes from 4f electron of Ho, and never quenches. © 2014 Higher Education Press and Springer-Verlag Berlin Heidelberg.

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.

Lv H.,Wuhan University of Technology | Cheng N.,Wuhan University of Technology | Mu S.,Wuhan University of Technology | Pan M.,Wuhan University of Technology
Electrochimica Acta | Year: 2011

To improve their electrochemical stability as catalyst supports for proton exchange membrane (PEM) fuel cells, carbon nanotubes (CNTs) are heat treated in an ammonia atmosphere. High-resolution transmission electron microscopy, nitrogen adsorption, Raman spectroscopy, and X-ray photoelectron spectroscopy are employed to study the temperature effect on the structure of the heat-treated CNTs (H-CNTs), and a thorough investigation of their resistance to electrochemical oxidation is also measured by an electrochemical technique. The amount of surface oxides on the CNTs is visibly high in comparison to the H-CNTs after 48 h of oxidation, indicating that the H-CNTs have a higher resistance to electrochemical oxidation. Pt nanoparticles supported on both CNTs and H-CNTs are fabricated through a polyol process in an ethylene glycol solution. The improvement of the dispersion of Pt nanoparticles on nanotubes from the heat treatment is demonstrated, and the results show that the Pt nanoparticles deposited on the H-CNTs heated at 1000 °C are electrochemically accessible. Therefore, they can be used as a durable support for Pt catalysts in fuel cells. © 2011 Elsevier Ltd. All rights reserved.

Tan X.J.,Wuhan University | Liu W.,Wuhan University of Technology | Liu H.J.,Wuhan University | Shi J.,Wuhan University | And 2 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

The band structure of Mg 2Si 1-xSn x solid solutions with 0.250 ≤ x ≤ 0.875 is calculated using the first-principles pseudopotential method. It is found that the low-lying light and heavy conduction bands converge and the effective mass reaches a maximum value near x = 0.625. Using the semiclassical Boltzmann transport theory and relaxation-time approximation, we find that the system with x = 0.625 exhibits both higher Seebeck coefficient and higher electrical conductivity than other solid solutions at intermediate temperatures. By fitting first-principles total energy calculations, a modified Morse potential is constructed, which is used to predicate the lattice thermal conductivity via equilibrium molecular dynamics simulations. Due to relatively higher power factor and lower thermal conductivity, the Mg 2Si 0.375Sn 0.625 is found to exhibit enhanced thermoelectric performance at 800 K, and additional Sb doping is considered in order to make a better comparison with experiment results. © 2012 American Physical Society.

Mai L.,Wuhan University of Technology | Wei Q.,Wuhan University of Technology | An Q.,Wuhan University of Technology | Tian X.,Wuhan University of Technology | And 5 more authors.

Hybrid nanostructural VO2 (B) composed of nanoscrolls, nanobelts and nanowires is synthesized through a hydrothermal-driven splitting and self-rolled method. The hybrid nanostructure with nanoscroll buffered effect provides facile strain relaxation for swelling during lithiation/delithiation, resulting in the excellent structural stability and cyclability. The interior of nanoscrolls and the interconnected voids shorten the ion diffusion pathway, which greatly enhances the rate performance. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Lu Y.,Wuhan University of Technology | Liu Z.,Wuhan University of Technology
Tribology Transactions | Year: 2013

The lubricant characteristics of porous self-lubricating composites with a realistic rough surface are incorporated into an improved elastohydrodynamic model. The evolved model demonstrates that the wear rate can be measured by examining the lubricant distribution at various fractal dimensions and porosities. The results show that the physical nature of the rough surface topography and the composite's physical properties must be understood, because the relative contact area is enlarged and friction forces are increased by the increase in the fractal dimension and the porosity. It is obvious that the method can significantly improve the lubricant properties to avoid wear by controlling these two coupled effects. The research also indicates that optimization of the design the microstructure of the porous self-lubricating composite should focus on the porosity based on the wear rather than the amount of lubricant. © Society of Tribologists and Lubrication Engineers.

Duan P.,Wuhan University of Technology | Shui Z.,Wuhan University of Technology | Chen W.,Wuhan University of Technology | Shen C.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

The pore structure and interfacial transition zone (ITZ) of concrete incorporating slag, silica fume and metakaolin were analyzed in this study. Some techniques such as mercury intrusion porosimetry (MIP), microhardness testing and scanning electronic microscopy (SEM) were employed to characterize the effects of slag, silica fume and metakaolin on the pore structure, microhardness and morphology of the ITZ at 28 and 180 days. The traditional properties such as compressive strength were experimentally evaluated in relation to pore characteristics and ITZ. Meanwhile, the influence of silicon, as the major component of slag, silica fume and metakaolin, on thermodynamic stability of hydrate phases was further investigated. The experimental results show that mineral admixtures have positive impact on pore refinement and ITZ enhancement of concrete especially at later curing stages. The effect of the mineral admixtures on microstructure is in the sequence: metakaolin > silica fume > slag. The development of the compressive strength is related to the evolution of the pore structure and ITZ. Thermodynamic stability analysis indicates that if mineral admixtures are added to the CaO-Al2O 3-CaSO4-H2O system, the phase assemblage of C6AsH32 and C3AS0.8H4.4, which represents a member of the solid solution series Ca3Al 2(SiO4)3-x(OH)4 x, has a lower Gibbs free energy of reaction and is therefore thermodynamically more stable than monosulfoaluminate at temperatures from 1 to 99 C. © 2013 Elsevier Ltd. All rights reserved.

Wang F.,Wuhan University of Technology | Liu Y.,Wuhan University of Technology | Hu S.,Wuhan University of Technology
Construction and Building Materials | Year: 2013

The effect of pH value, Ca2+ concentration and water loss induced by cement hydration on emulsion stability was investigated by measuring the Zeta potential of asphalt droplets. The microstructure of emulsion was also observed by optical microscope. The results indicate that the chemical stability of cationic emulsion is strongly affected by pH value increase and the addition of nonionic emulsifier improves the alkali resistance property of emulsion. However, the chemical stability of anionic emulsion was slightly improved by pH increase. Ca2+ slightly influences the cationic and anionic emulsions due to its small concentration in the cement paste pore solution. The Zeta potentials of both cationic and anionic emulsions were sharply decreased due to water loss. © 2013 Elsevier Ltd. All rights reserved.

Yu S.,Wuhan University of Technology
Journal of Convergence Information Technology | Year: 2012

By using structure breaks theory, this paper analyzes the stability of data generating process of quarter data of GDP and FDI from first quarter in 1994 to first quarter in 2011. According to this analysis we make a process to eliminate the structure breaks of GDP data, and then we build the co-integration link and error correction model between FDI and GDP. The results of empirical analysis show that there is a long-term co-integration relationship between FDI and GDP. Moreover for absence of endogenous stabilizing mechanism in Chinese economy, the short-term fluctuating of FDI maybe is the reason for dramatic fluctuating of Chinese economic growth and causes the structure breaks of GDP data.

Li Z.,Taiyuan University of Technology | Yan X.,Wuhan University of Technology
Insight: Non-Destructive Testing and Condition Monitoring | Year: 2013

The sensor fusion of multi-sensory measurements is believed to improve the defect detection ability for machinery condition monitoring. A new fault diagnosis method for rolling bearings based on the sensor fusion of oil analysis data, microscopic debris analysis data and vibration analysis data is proposed in this paper. Multi-dimensional sensors were used to record the tribological and vibration data of rolling bearings in typical fault experiments. Oil and microscopic debris analysis was applied to obtain the wear particle number and size distribution, chemical compositions and particle textures, etc. Wavelet transform (WT) and empirical mode decomposition (EMD) were employed to attain the distinguishing features of the vibration data. Then, an intelligent data fusion method based on principal component analysis (PCA) and a genetic algorithm fuzzy neural network (GAFNN) was employed to identify the rolling bearing conditions. Experimental tests have been carried out to evaluate and verify the proposed method. The analysis results show that the fault detection model using the sensor fusion technique produces superior results to those using single measurements and thus it has application importance.

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.

Yu J.,Wuhan University of Technology | Zhao W.,Wuhan University of Technology | Zhou H.,Wuhan University of Technology | Wei P.,Wuhan University of Technology | Zhang Q.,Wuhan University of Technology
Scripta Materialia | Year: 2013

A simple, efficient and rapid method was developed to prepare barium and indium double-filled p-type skutterudite bulk materials by melt-quenching and spark plasma sintering. The whole processing time is shortened to less than 30 h vs. the 9 days that the traditional method requires. Comparable electrical conductivity and a significant enhancement in Seebeck coefficient can be realized simultaneously by optimizing the sintering temperature. A comparable ZT value of 0.61 at 800 K was obtained due to a remarkably enhanced power factor.

Li C.,Wuhan University of Technology | Li L.,Wuhan University of Technology
Advances in Engineering Software | Year: 2012

Han X.,Wuhan University of Technology | Yi F.,Wuhan University of Technology | Sun T.,Wuhan University of Technology | Sun J.,Wuhan University
Electrochemistry Communications | Year: 2012

Metal-1,4,5,8-naphthalenetetracarboxylates (Metal = Li and/or Ni) were synthesized and investigated as anode materials for lithium ion batteries. These complexes were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and thermogravimetry. Electrochemical tests indicated that these materials exhibited superior electrochemical performance and good cycling stability. © 2012 Elsevier B.V.

Zhang Q.-X.,Wuhan University of Technology | Yin L.-B.,Wuhan University of Technology
Electrochemistry Communications | Year: 2012

Spherical Au-Pd bimetallic nanoparticles, for the first time, have been elucidated to have a high electrochemical performance toward As(III) by square wave anodic stripping voltammetry. A strong Pd tuned effect on electrochemical performance in the detection of As(III) was found. A high sensitivity of 3.9 μA/ppb with a low limit of detection (LOD) of 2.40 × 10 - 2 ppb was obtained for Au 1Pd 3 bimetallic nanoparticle. © 2012 Elsevier B.V.

Zhang L.,Wuhan University of Technology | Zhu J.,Wuhan University of Technology | Zhou W.,Wuhan University of Technology | Wang J.,Wuhan University of Technology | Wang Y.,Wuhan University of Technology
Energy | Year: 2012

Graphite nanoplatelets (GnPs), obtained by sonicating the expanded graphite, were employed to simultaneously enhance the thermal (k) and electrical (σ) conductivity of organic form-stable phase change materials (FSPCMs). Using the method of in situ polymerization upon ultrasonic irradiation, GnPs serving as the conductive fillers and polyethylene glycol (PEG) acting as the phase change material (PCM) were uniformly dispersed and embedded inside the network structure of polymethyl methacrylate (PMMA), which contributed to the well package and self-supporting properties of composite FSPCMs. X-ray diffraction and Fourier transform infrared spectroscopy results indicated that the GnPs were physically combined with PEG/PMMA matrix and did not participate in the polymerization. The GnPs additives were able to effectively enhance the k and σ of organic FSPCM. When the mass ratio of GnP was 8%, the k and σ of FSPCM changed up to 9 times and 8 orders of magnitude over that of PEG/PMMA matrix, respectively. The improvements in both k and σ were mainly attributed to the well dispersion and large aspect ratio of GnPs, which were endowed with benefit of forming conducting network in polymer matrix. It was also confirmed that all the prepared specimens possessed available thermal storage density and thermal stability. © 2012 Elsevier Ltd.

Weng L.-N.,Wuhan University of Technology | Yang J.,Wuhan University of Technology
Computer Communications | Year: 2010

Dai J.,Wuhan University of Technology | Yang M.,Wuhan University of Technology | Yu X.,Huazhong University of Science and Technology | Lu H.,Huazhong University of Science and Technology
Optical Fiber Technology | Year: 2013

A novel fiber optical fiber hydrogen sensor based on etched fiber Bragg grating coated with Pd/Ag composite film is proposed in this paper. Pd/Ag composite films were deposited on the side-face of etched fiber Bragg grating (FBG) as sensing elements by magnetron sputtering process. The atomic ratio of the two metals in Pd/Ag composite film is controlled at Pd:Ag = 76:24. Compared to standard FBG coated with same hydrogen sensitive film, etched FBG can significantly increase the sensor's sensitivity. When hydrogen concentrations are 4% in volume percentage, the wavelength shifts of FBG-125 μm, FBG-38 μm and FBG-20.6 μm are 8, 23 and 40 pm respectively. The experimental results show the sensor's hydrogen response is reversible, and the hydrogen sensor has great potential in hydrogen's measurement. © 2012 Elsevier Inc. All rights reserved.

Zhou H.J.,Wuhan University of Technology
Advanced Materials Research | Year: 2013

Big vibration will be cause by train load and crane load in the over-track buildings, and then generate structure-borne moise in the buildings, which will affect the live quality of the people lived in the buildings greatly. Focusing on this proble, three finite element method is established based on a practical engineering. The measures of reducing noise and vibration is proposed according the characteristics of the building, which is to replace the steel column as concrete column. The dynamic responses of the building under the two cases are calculated and analyzed. The computation results show that the measurement can reduced structure vibration significantly, and accordingly, the structure-borne noise is also reduced greatly. The research results in the paper have strong engineering practicability and can provide some references for some other projections in China in future. © (2013) Trans Tech Publications, Switzerland.

Min X.,Wuhan University of Technology | Wang T.,Wuhan University of Technology
Materials Science Forum | Year: 2011

The relation among electronic structure, chemical bond and properties of TiC-TiB2 composite was studied by the first principle method. The ionic interaction between the ions in the interface of the TiC-TiB2 composite is stronger than that of the inner ions or of the related single phase. There is stronger covalent interaction between the ions in the interface of the TiC-TiB2 composite. There are differences of densities of state (DOS) among of TiC-TiB2 composite and related single phases as the interaction between of TiB2 and TiC phases. The width of DOS for interface Ti 3d is obviously larger than that of corresponding TiB2 or TiC phase, as the interaction between Ti 3d in interface and others is larger than that between Ti 3d in TiB2 or TiC phase and others. © (2011) Trans Tech Publications.

He X.H.,Wuhan University of Technology
Advanced Materials Research | Year: 2013

This paper mainly introduces the specific research contents of fire fighting equipment management based on grid technology. Through the establishment of a complete set of grid system, combining with database theory to complete the design of database about fire fighting equipment management system, initiatively updating information, it will be easy to achieve digitized management objects, the efficient management, and networked information processing. © (2013) Trans Tech Publications, Switzerland.

Zhang Z.,Wuhan University of Technology | Liu C.,Wuhan University of Technology | Zhao X.,Wuhan University of Technology
Journal of Physical Chemistry C | Year: 2015

The lead chalcogenide quantum dots with a size smaller than 3 nm and good chemical stability were difficult to synthesize due to the poor chemical reactivity of commonly used phosphine-free chalcogen and lead sources. Here we report the synthesis of small and surface passivated PbSe quantum dots (QDs) by addition of SnCl2 as the nucleation promoting agent and PbCl2 as the in situ passivation agent. Common PbCl2 (dissolved in oleylamine, oleic acid, and 1-octadecene) and elemental Se (dissolved in oleylamine) were used to synthesize small PbSe QDs by addition of SnCl2 to promote the fast nucleation of PbSe nanocrystals. The sizes of the PbSe QDs are between 3 and 8 nm and are tunable by controlling the ratio of PbCl2/SnCl2 and the reaction time. High photostability of PbSe QDs approved by the XPS analysis and photoluminescence spectra of PbSe QDs was also achieved by the in situ formation of thin halide adlayers on the surface of QDs. This new method is green with accessible raw materials and simple in situ passivation scheme and will enable the broader utilization of PbSe QDs in ambient conditions in many optoelectronic applications. © 2015 American Chemical Society.

Ren Z.,Jiang Nan University | Zhang D.,Wuhan University of Technology | Wang Z.,Wuhan University of Technology
Energy | Year: 2012

Proton exchange membrane fuel cell (PEMFC) is a potential alternative for the internal combustion engine. But many problems, such as metallic bipolar plate instead of graphite bipolar plate to decrease the cost, should be solved before its application. Based on the previous results that single cell with TiN/Ti as bipolar plates shows high performance and enough long-time durability, the progress on the stacks with TiN/Ti as bipolar plates is reported in this manuscript. Till now seldom report is focused on stacks because of the complicated processing technique, especially for that with TiN/Ti as bipolar plate. The flow field in the plate is punched from titanium deformation, and two plates are welded by laser welding to form one piece of bipolar plate. The adopted processing techniques for stacks with TiN/Ti as bipolar plate exhibit advantage and feasibility in industry. The power density by weight for the stack is as high as 1353 W kg-1, although it still has space to be improved. Next work should be focused on the design of flow channel parameters and flow field type based on plastic deformation of metal materials. © 2012 Elsevier Ltd.

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

Electrocardiogram (ECG) is one of the important methods to detect heart disease. ECG automatic recognition is not only the target of medicine, but also the work of computer science. In this paper, a DNA algorithm based on syntactic recognition is proposed to solve this problem. And a DNA molecular automata and the DNA encoding scheme are also given in the rest of the paper. The simulation results can prove the feasibility of this method. Copyright © 2013 American Scientific Publishers.

Tan G.-L.,Wuhan University of Technology | Zhang L.,Wuhan University of Technology | Yu X.-F.,Wuhan University
Journal of Physical Chemistry C | Year: 2010

CdS nanocrystals have been successfully synthesized by a mechanical alloying process. The X-ray diffraction (XRD) pattern shows that the major phase of the product was wurtzite CdS compound after mechanical alloying of the elemental powders for 60 min. All the diffraction peaks from the elemental Cd and S powders disappeared completely in the XRD patterns of as-milled CdS nanocrystals ball milled for more than 10 h. High-resolution transmission electron microscopy (HRTEM) images confirmed the wurtzite structure of asmilled CdS nanocrystals. The as-milled CdS nanocrystals were subsequently capped with trioctylphosphine oxide/trioctylphosphine/nitric acid (TOPO/TOP/NA), which leads to the formation of yellow dispersion solution. The size of capped CdS nanocrystals ranges from 1.6 to 6.2 nm. The capped CdS nanocrystals show similar optical properties to those CdS nanocrystals prepared by the wet chemical process, the absorption peaks for the capped CdS nanocrystals locate within the range of 345 to 380 nm. © 2010 American Chemical Society.

Shi B.,Wuhan University of Technology | Yan L.-X.,Wuhan University of Technology | Wu W.,National Cheng Kung University
Industrial and Engineering Chemistry Research | Year: 2012

A new rule-based model for single-stage multiproduct scheduling problem (SMSP) in batch plants with parallel units is proposed. The scheduling problem is decomposed into two subproblems of order assignment and order sequencing. A group of order assignment rules are introduced to select suitable units for customer orders. While flexible constraint handling strategies are proposed to eliminate the constraints of forbidden units and unit release times and convert the hard constraint of forbidden sequences to a soft one, leading to any arbitrary order sequence can be synthesized into a legal schedule. The line-up competition algorithm (LUCA) is presented to obtain optimal order sequence and order assignment rule, which can minimize makespan, total tardiness, or total cost. Through comparative study, the proposed approach has demonstrated its effectiveness for solving a large size SMSP. © 2012 American Chemical Society.

Mu S.,Wuhan University of Technology | Tian M.,Wuhan University of Technology
Electrochimica Acta | Year: 2012

Yu J.,Wuhan University of Technology | Qi L.,Wuhan University of Technology | Jaroniec M.,Kent State University
Journal of Physical Chemistry C | Year: 2010

Pt/TiO2 nanosheets with exposed (001) facets were fabricated by a simple hydrothermal route in a Ti(OC4H9) 4-HF-H2O mixed solution followed by a photochemical reduction deposition of Pt nanoparticles on TiO2 nanosheets under xenon lamp irradiation. The prepared samples were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherms, UV-vis diffuse reflectance spectroscopy, and photoluminescence (PL) spectroscopy. Production of OH radicals on the TiO2 surface was detected by the PL technique using coumarin as a probe molecule. The effects of Pt loading on the rates of photocatalytic hydrogen production of the as-prepared samples in ethanol aqueous solution were investigated and discussed. The results showed that the photocatalytic hydrogen production rates of TiO2 nanosheets from the ethanol aqueous solutions were significantly enhanced by loaded Pt on the TiO2 nanosheets, and the latter with a 2 wt % of deposited Pt exhibited the highest photocatalytic activity. All fluorinated TiO2 nanosheets exhibited much higher photocatalytic activity than Degussa P25 TiO2 and pure TiO2 nanoparticles prepared in pure water due to the synergistic effect of surface fluorination and exposed (001) facets. © 2010 American Chemical Society.

Yu J.,Wuhan University of Technology | Zhang J.,Wuhan University of Technology | Liu S.,Wuhan University of Technology
Journal of Physical Chemistry C | Year: 2010

Monodisperse CuS/ZnS nanocomposite hollow spheres with diameters of about 255 nm and shells composed of nanoparticles have been successfully synthesized in high yield by an ion-exchange method using monodiesperse ZnS solid spheres as a precursor. The prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption isotherms, and UV-visible absorption spectroscopy. The photocatalytic activity was evaluated by the photocatalytic decolorization of Rhodamine B (RhB) aqueous solution under visible-light irradiation. The results indicate that the difference of solubility products (Ksp) of ZnS and CuS is the main driving force for the formation of CuS/ZnS hollow spheres. A sequential evolution process involving surface deposition, mutual diffusion, interior dissolution, and interfacial reaction is proposed to account for the formation of CuS/ZnS nanocomposite hollow spheres. The reaction time greatly influences the physical properties and photocatalytic activity of hollow spheres. With increasing reaction time, the BET surface areas decrease and, contrarily, the average pore size and pore volume increase. The prepared CuS/ZnS composite hollow spheres exhibit a higher visible-light photocatalytic activity than single ZnS solid or CuS hollow spheres for the photocatalytic decolorization of RhB aqueous solution. The photogenerated holes are thought to be the main active species responsible for the photocatalytic degradation of RhB. The ion-exchange method will provide new insight into the fabrication of composite hollow spheres and other new photocatalytic materials. We believe that the prepared CuS/ZnS hollow spheres are also of great interest in solar cells, catalysis, separation technology, biomedical engineering, and nanotechnology. © 2010 American Chemical Society.

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.

Yu J.,Wuhan University of Technology | Dai G.,Wuhan University of Technology | Cheng B.,Wuhan University of Technology
Journal of Physical Chemistry C | Year: 2010

Highly ordered TiO2 nanotube array (TNs) thin films were prepared by electrochemical anodization of titanium foil in a mixed electrolyte solution containing Na2SO4, H3PO4, NaF, and sodium citrate and then treated by calcination, vapor-thermal, and hydrothermal methods, respectively. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of the film samples was evaluated by photocatalytic degradation of methyl orange (MO) aqueous solution under UV light irradiation. The production of hydroxyl radicals (•OH) on the surface of UV-irradiated samples was detected by a photoluminescence technique using terephthalic acid as a probe molecule. The transient photocurrent response was measured by several on-off cycles of intermittent irradiation. It was found that post-treatment exhibited a great influence on the morphology, crystallization, and photocatalytic activity of TNs thin films. Calcination and vapor-thermal treatment had no great influence on surface morphology and architecture of the TNs films. On the contrary, for the hydrothermal treated samples, the nanotube array structures were completely destroyed, and only aggregated anatase particles were observed. The vapor-thermal-treated films showed higher photocatalytic activity than the calcined and hydrothermal treated films. This was attributed to the fact that the vapor-thermal-treated films had better crystallization than the calcined films and remained tubular structures compared with the hydrothermal-treated samples. Good crystallization and remaining tubular structures resulted in the highest photocatalytic activity of the vapor-thermal-treated films. © 2010 American Chemical Society.

Yang M.,Wuhan University of Technology | Sun Y.,Wuhan University of Technology | Zhang D.,Wuhan University of Technology | Jiang D.,Wuhan University of Technology
Sensors and Actuators, B: Chemical | Year: 2010

In this article, a fiber-optic hydrogen gas sensor using composite palladium and tungsten trioxide (WO3) was proposed and characterized. By magnetron co-sputtering process, Pd/WO3 composite thin films were deposited on end surface of a single-mode fiber (SMF) and a side-etched multimode fiber (MMF). Modulation of optical power intensity is observed with different hydrogen concentrations. Due to its different sensing principle and structure, improvement of hydrogen sensing response and mechanical stability is reported. © 2009 Elsevier B.V. All rights reserved.

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.

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.

Xu Z.,Wuhan University of Technology | Xu Z.,Kent State University | Xu Z.,Huanggang Normal University | Yu J.,Wuhan University of Technology | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Mesoporous aluminum oxyhydroxides composed of nanoflakes were prepared via a water-in-oil microemulsion-assisted hydrothermal process at 50 C using aluminum salts as precursors and ammonium hydroxide as a precipitating agent. The microstructure, morphology, and textural properties of the as-prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption, and X-ray photoelectron spectroscopy (XPS) techniques. It is shown that the aluminum oxyhydroxide nanostructures studied are effective adsorbents for removal of formaldehyde (HCHO) at ambient temperature, due to the abundance of surface hydroxyl groups, large specific surface area, and suitable pore size. Also, the type of aluminum precursor was essential for the microstructure formation and adsorption performance of the resulting materials. Namely, the sample prepared from aluminum sulfate (Al-s) exhibited a relatively high HCHO adsorption capacity in the first run, while the samples obtained from aluminum nitrate (Al-n) and chloride (Al-c) exhibited high adsorption capacity and relatively stable recyclability. A combination of high surface area and strong surface affinity of the prepared aluminum oxyhydroxide make this material a promising HCHO adsorbent for indoor air purification. © 2014 American Chemical Society.

Zhou S.,Wuhan University of Technology | Zhang Q.,Wuhan University of Technology | Wu C.,Wuhan University of Technology | Huang J.,Wuhan University of Technology
Materials and Design | Year: 2013

Polymer-based composite reinforced by fibrous filler has aroused wide concern in the field of tribology and material science. In this manuscript, the effect of carbon fiber (CF) as filler on the structure, mechanical and tribological properties of the polyamide6/polyphenylene sulfide (PA6/PPS) composites were investigated carefully in order to provide a practical guidance for the use of the polymer-based composites. It was found that the introducing of carbon fibers improved strength, modulus and hardness of the PA6/PPS blend apparently while breaking elongation rate and impact strength just decreased in a small degree. Average friction coefficient value of the carbon fiber-reinforced PA6/PPS composites (PA6/PPS-CF) was lower than PA6/PPS blend at the stable stage. As the content of carbon fiber increased, the wear rate of the PA6/PPS-CF composites trended to increase. Under the friction condition of high applied load or high sliding speed, the friction coefficient of the PA6/PPS-CF composites inclined to decrease while wear rate increased. When slided under a relatively high load of 20 N or high speed of 1500 r/min, the wear resistance of PA6/PPS-CF behaved was better as the content of carbon fiber increased. Scanning electron microscopy of worn surface morphology has revealed that the main wear mechanism of the PA6/PPS-CF composites were adhesive wear. © 2012 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.

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.

Sun T.,Wuhan University of Technology | Sun T.,University of Munster | Qing G.,Wuhan University of Technology | Qing G.,University of Munster | And 2 more authors.
Chemical Society Reviews | Year: 2011

Controlling the interfacial chemical and physical properties, and thus modulating the behaviours of cells and biomolecules on material surfaces, form an important foundation for the development of high-performance biomaterials and devices. Biological systems in nature exhibit unique features in this aspect. The first one is that the superior properties of natural biomaterials are normally not determined by their bulk properties, but more related to the multi-scale micro- and nanostructures on the surface; the second is that biological systems usually utilize highly specific weak interactions (e.g. hydrogen bonding interaction, hydrophobic interaction, etc.) to solve the problems of biomolecule interactions; the third is that the biomolecules in nature are often chiral molecules and show high preference for one specific enantiomorphous configuration, suggesting a distinctive chiral recognition mechanism in biological systems. These features bring much inspiration to design novel biointerface materials with special functionalities, e.g. structural biointerface materials, smart biointerface materials and chiral biointerface materials. The purpose of this critical review is to give a brief introduction of recent advances in these aspects (90 references). © 2011 The Royal Society of Chemistry.

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.

Vardhan H.,Wuhan University of Technology | Verpoort F.,Wuhan University of Technology | Verpoort F.,Korea Polytechnic University
Advanced Synthesis and Catalysis | Year: 2015

The catalytic nature of self-assembled metal-organic polyhedra gives an entirely new dimension to the reactivity and properties of molecules within a well-defined confined space. Encapsulation of a range of guests brings about not only host-guest interactions but also gives rise to unusual reactivities with selectivity and stabilization of various reactive intermediates. This review briefly covers the synthesis of self-assembled metal-organic polyhedra and elaborates their influence in different chemical reactions as well as in the stabilization of unstable chemical species. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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.

Qian D.,Wuhan University of Technology | Pan Y.,Wuhan University of Technology
Computational Materials Science | Year: 2013

Radial-axial ring rolling (RARR) is an advanced plastic rotary forming technique used to manufacture seamless large rings. In RARR, blank-forging and rolling are the two consecutive forming processes. The former plays an important role to the latter as it has important genetic influence on rolling. However, this influence was not considered in the current finite element model (FEM) researches of RARR, in which the geometry and thermodynamic state of the ring blank were idealized and the microscopic deformation behaviors were rarely studied. In this paper, a 3D coupled macro-microscopic finite element (FE) model combining blank-forging and rolling processes of AISI 4140 steel large ring is firstly developed under SIMUFACT software environment, and its reliability is verified experimentally. Based on the valid model, the evolution and distribution laws of strain, temperature, grains sizes, dynamic recrystallization from the ingot to ring blank to rolled ring during the process are revealed. The results obtained show that: (1) the strain and temperature distribution are neither uniform nor symmetrical before or after rolling. (2) Higher temperature and larger strain both contribute to the higher dynamic recrystallization fraction. (3) Higher deformation temperature drives the dynamic recrystallized grains sizes bigger while higher strain rate decreases it. ©2013 Elsevier B.V. All rights reserved.

Wang J.F.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

In view of the fact that the complex control of car moving device, its small application range, the difficulty to reach the accurate location of vehicles and so on, therefor a new design and research for a car moving device of remote control is proposed; The Mecanum wheel is chosen to achieve the omnidirectional movement, so that the vehicle can reach the predetermined position quickly. The electro-hydraulic push rod is used to realize the automatic lifting,and it is also convenient and efficient; In addition, AT89C52 microcontroller which cost less but can meet the requirements realize the control. © (2014) Trans Tech Publications, Switzerland.

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

In this information age, "information" is regarded as a very hot and very common word to everyone living in the earth. Its importance and wide application are commonly seen in our daily life by every one. In the paper, the author will research the application of information system in interpretation training, at the same time, the author also exploits some detail roles of information system in interpretation training. The combination of information system and interpretation is very complex course for improving training skills. Therefore, training skills are very important for the good combination of information system and interpretation too. In the study, the author also makes some investigation and statistics to exploit some useful data on the application of information system, which will be useful for effective interpretation training. © (2014) Trans Tech Publications, Switzerland.

Wang C.C.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

It is very important to recycle and deal with them effectively for environment protection resources saving. In this paper, on the basis of relevant knowledge of classified recycling, we combine the situation of our surveying actually, establish electronic information platform which is suitable waste electronics. More important being, we design a recovery bins can be classified recycling battery. What's more, according to the waste electronics recycling system, we put forward to increase the recovery rate and the better classified recycling. © (2014) Trans Tech Publications, Switzerland.

Geng H.,Wuhan University of Technology | Li Q.,Wuhan University of Technology | Li Q.,University of Leeds
Materials Characterization | Year: 2014

Granulated blast-furnace slag was activated by Ca(OH)2 formed during ordinary Portland cement hydration when used as supplementary cementitious materials together with ordinary Portland cement. Slag hydrated through diffusion controlled process and the microstructure and chemical composition of hydration products affected by the chemical composition of slag. In this study, the microstructure and chemical composition development of slag hydration was observed by TEM-EDX and found to be through the diffusion of Ca, Al and Si, and in situ formation of Mg-Al layered double hydroxide. Inner product calcium silicate hydrates (C-S-H) gel formed within the rim of the slag particles after the whole slag particle was diffused. The addition of slag into ordinary Portland cement reduced Ca/Si ratio, increased Al/Si ratio of C-S-H gel comparing to ordinary Portland cement paste. Mg/Al ratio of Mg-Al layered double hydroxide in the hydration products was around 2. © 2013 Elsevier Inc.

Yu J.,Wuhan University of Technology | Zhang J.,Wuhan University of Technology
Dalton Transactions | Year: 2010

Mesporous anatase-phase TiO2 hollow spheres with high photocatalytic activity were prepared by hydrothermal treatment and self-transformation of amorphous TiO2 solid spheres in an NH 4F aqueous solution. The prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption isotherms and UV-vis absorption spectroscopy. The photocatalytic activity was evaluated by photocatalytic oxidation decomposition of acetone in air under UV irradiation. It is found that F- plays an essential role in the formation of TiO2 hollow spheres. F- not only induces the hollowing of TiO2 solid spheres, but also promotes the crystallization of anatase TiO2 nanocrystals. A possible formation mechanism for the TiO 2 hollow spheres by localized Ostwald ripening or chemically induced self-transformation is proposed based on the experimental observations. Furthermore, the molar ratios of NH4F to TiO2 (R) exhibit a significant influence on the morphology and photocatalytic activity of the TiO2 samples. The photocatalytic activity of the samples prepared in the presence of NH4F is higher than that of TiO2 sample prepared in pure water and commercial Degussa P25 (P25) powders. Especially, the TiO2 hollow spheres prepared at R = 1 show the highest photocatalytic activity and the specific rate constant Sk exceeds that of P25 by a factor of more than two. © The Royal Society of Chemistry 2010.

Li Y.,Wuhan University of Technology | Liu J.,Central China Normal University | Huang X.,Central China Normal University | Yu J.,Wuhan University of Technology
Dalton Transactions | Year: 2010

Carbon-modified Bi2WO6 (C-Bi2WO 6) nanostructures were synthesized via a hydrothermal process in the presence of glucose followed by the calcination in Ar gas at 500 °C. The morphologies and crystallinity of Bi2WO6 and the nature of carbon in the composites obtained with different glucose amounts were characterized. Raman spectrum analysis, electron microscopy results and light absorption of C-Bi2WO6 at wavelengths larger than 450 nm clearly confirmed the carbon modification. Further results indicated that glucose did not affect the final crystalline structure or the band gap of Bi2WO6, but it had great influences on the photocatalytic activity of Bi2WO6 towards rhodamine-B (RhB) degradation. When the glucose amount was less than 0.04 g, the photoactivity was enhanced step by step with an increase in the glucose amount. The improved photocatalytic performance could be ascribed to the enhanced photogenerated electron-hole separation and more RhB adsorption associated with carbon. However, when the glucose amount was higher than 0.04 g, the photocatalytic property dramatically decreased due to the severe absorption of almost incident light by carbon, which hindered the accessibility of light to Bi2WO6. Our work provides an alternative way to improve the photoactivity of Bi 2WO6 nanomaterials. © 2010 The Royal Society of Chemistry.

Weng X.,Wuhan University of Technology | Mei G.,Wuhan University of Technology | Zhao T.,Wuhan University of Technology | Zhu Y.,Wuhan University of Technology
Separation and Purification Technology | Year: 2013

A novel quaternary ammonium surfactant (M-302) containing ester bonds and hydrocarbon tails was synthesized. The first use of M-302 as a collector for reverse cationic flotation of silicates from a Chinese magnetite iron ore was reported in this study. The study revealed that efficiency of classification was highest in the presence of 0.159 mmol/L M-302 and 300 g/t alkaline starch, at neutral pH. M-302 presents significant selectivity for silicates. Moreover, the collector concentration effect of M-302 was studied by flotation response of magnetite as functions of the depressant dosage, temperature and pulp pH to comparatively investigate the collecting ability with dodecylamine chloride. The results showed that M-302 demonstrates a stronger collecting power than dodecylamine chloride. The comparative experiments between M-302 and dodecylamine chloride on their foam stability and biodegradation properties were also conducted. Besides, by the measurement of zeta potentials, the results show that M-302 is preferred to adsorb on the surface of quartz. © 2012 Published by Elsevier B.V. All rights reserved.

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.

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.

Zhou J.,Wuhan University of Technology | Yang S.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Shu Z.,Wuhan University of Technology
Journal of Hazardous Materials | Year: 2011

Hollow microspheres of hierarchical Zn-Al layered double hydroxides (LDHs) were synthesized by a simple hydrothermal method using urea as precipitating agent. The morphology and microstructure of the as-prepared samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), nitrogen adsorption-desorption isotherms and fourier transform infrared (FTIR) spectroscopy. It was found that the morphology of hierarchical Zn-Al LDHs can be tuned from irregular platelets to hollow microspheres by simply varying concentrations of urea. The effects of initial phosphate concentration and contact time on phosphate adsorption using various Zn-Al LDHs and their calcined products (LDOs) were investigated from batch tests. Our results indicate that the equilibrium adsorption data were best fitted by Langmuir isothermal model, with the maximum adsorption capacity of 54.1-232. mg/g; adsorption kinetics follows the pseudo-second-order kinetic equation and intra-particle diffusion model. In addition, Zn-Al LDOs are shown to be effective adsorbents for removing phosphate from aqueous solutions due to their hierarchical porous structures and high specific surface areas. © 2011 Elsevier B.V.

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.

Li S.,Wuhan University of Technology | Zhou M.,Wuhan WUTOS Ltd Company
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).

Chen P.,Wuhan University of Technology | Luo G.,Wuhan University of Technology | Shen Q.,Wuhan University of Technology | Li M.,Wuhan University of Technology | Zhang L.,Wuhan University of Technology
Materials and Design | Year: 2013

In this work, nearly full density W-23.5wt.% Cu composite was fabricated by activated sintering with Zn additive. Because of low melting point and high saturated vapor pressure for Zn, Zn additive was introduced into W-23.5wt.% Cu composite to enhance the densification of W-Cu composite. The effects of relative density, Zn additive contents, microstructure and fractographs on thermal conductivity, electrical conductivity and coefficient of thermal expansion were evaluated by scanning electron micrograph, energy disperse spectrum, X-ray photoelectron spectroscopy and Archimedes method. It was found that adding Zn additive led high relative density for W-Cu composite while thermal conductivity and electrical conductivity were preserved at good values which were 198.5Wm-1K-1 and 1.44×106(Ωm)-1, respectively. The fractographs of W-Cu composite indicated the presence of strong grain-boundaries, which was beneficial to the thermal conductivity and electrical conductivity. The coefficient of thermal expansion was decreased to appropriate value from 9.58×10-6 to 8.75×10-6K-1 by controlling Zn additive content. © 2012 Elsevier Ltd.

Lu Y.,Wuhan University of Technology | Liu Z.,Wuhan University of Technology
Tribology International | Year: 2013

The fluid lubricating film of a soft solid lubricant on a porous composite surface after a sliding process is analyzed by scanning electron microscopy. The results show that the self-lubrication mechanism of the porous composite can also result in a conventional hydrodynamic lubrication. A calculated model for porous self-lubricating composites with realistically rough surfaces is developed. The results show that the lubrication property is affected by the porosity. This effect does not change with the surface morphology even though the morphology promotes a hydrodynamic lubrication effect. The result indicates that the optimum porosity of the composite improves the lubricating properties. Therefore, the optimization of the composite microstructure can improve the lifespan of the mechanical component. © 2012 Elsevier Ltd.

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.

Yu J.,Wuhan University of Technology | Low J.,Wuhan University of Technology | Xiao W.,Wuhan University of Technology | Zhou P.,Wuhan University of Technology | Jaroniec M.,Kent State University
Journal of the American Chemical Society | Year: 2014

Control of TiO2 crystal facets has attracted enormous interest due to the fascinating shape-dependent photocatalytic activity of this material. In this work, the effect of the ratio of {001} and {101} facets on the photocatalytic CO2-reduction performance of anatase TiO2 is reported. A new "surface heterojunction" concept is proposed on the basis of the density functional theory (DFT) calculations to explain the difference in the photocatalytic activity of TiO2 with coexposed {001} and {101} facets. © 2014 American Chemical Society.

Yang L.,Wuhan University of Technology | Barrows A.T.,University of Sheffield | Lidzey D.G.,University of Sheffield | Wang T.,Wuhan University of Technology
Reports on Progress in Physics | Year: 2016

We review recent progress in the development of organometal halide perovskite solar cells. We discuss different compounds used to construct perovskite photoactive layers, as well as the optoelectronic properties of this system. The factors that affect the morphology of the perovskite active layer are explored, e.g. material composition, film deposition methods, casting solvent and various post-treatments. Different strategies are reviewed that have recently emerged to prepare high performing perovskite films, creating polycrystalline films having either large or small grain size. Devices that are constructed using meso-superstructured and planar architectures are summarized and the impact of the fabrication process on operational efficiency is discussed. Finally, important research challenges (hysteresis, thermal and moisture instability, mechanical flexibility, as well as the development of lead-free materials) in the development of perovskite solar cells are outlined and their potential solutions are discussed. © 2016 IOP Publishing Ltd.

Guan J.,Wuhan University of Technology | Mou F.,Wuhan University of Technology | Sun Z.,Wuhan University of Technology | Shi W.,Wuhan University of Technology
Chemical Communications | Year: 2010

We present a simple and effective heterogeneous contraction method to fabricate hollow spheres with controllable interior structures (ranging from solid, simple hollow to core-in-hollow-wall, double-wall hollow and core-in-double-hollow-wall spheres) by a non-equilibrium heat-treatment process of gel precursors with a high heating rate. © 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.

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.

Qiu T.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

The occurrence of heavy cyanobacterial blooms in eutrophic freshwater ecosystems has been a worldwide problem. Microcystins, the predominant toxins of cyanobacterial blooms, are associated with mortality and illness in both animals and human. In present study, we monitored the apoptosis of heart from MCs intoxication, and evaluated the roles of main apoptosis-related genes expression in cardiotoxic effects. The results revealed that MCs exposure led to the gradually rise in apoptotic cell number. Meanwhile, Bax, Bcl-2, p53, Caspase-3 and Caspase-9 gene expressions were significantly elevated simultaneously with the extension of the time. It suggested that MCs can cause damage to heart directly. © (2014) Trans Tech Publications, Switzerland.

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.

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.

Luo Z.,Wuhan University of Technology | Luo Z.,China Three Gorges University | Wen H.,Wuhan University of Technology | Guo H.,Wuhan University of Technology | Yang M.,Wuhan University of Technology
Optics Express | Year: 2013

A time- and wavelength-division multiplexing sensor network based on ultra-weak fiber Bragg gratings (FBGs) was proposed. The low insertion loss and the high multiplexing capability of the proposed sensor network were investigated through both theoretical analysis and experimental study. The demodulation system, which consists of two semiconductor optical amplifiers and one high-speed charge-coupled device module, was constructed to interrogate 2000 serial ultra-weak FBGs with peak reflectivity ranging from -47 dB to -51 dB and a spatial resolution of 2 m along an optical fiber. The distinct advantages of the proposed sensor network make it an excellent candidate for the large-scale sensing network. © 2013 Optical Society of America.

Li X.Y.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

A newly developed four-station translational and rotary worktable can be applied for complex human-machine hybrid operations and dangerous heat treatment operations. And the design can guarantee closed operations without involvement of human when the worktable rotates to the concentrated area, while the installation or other manual processing when the worktable rotates to the separate area. In addition, by designing innovative rotating and track-changing mechanism and the direction-holding mechanism, the work piece remains the constant direction in the rotation process. Furthermore, the interference problem of the Geneva mechanism of the track-changing fork is analyzed. Consequently, the smaller the angle of fork notch is, the smaller the force that fork reacts on the support shaft is, meanwhile, the strength can be satisfied more easily. The optimal angle of Y-fork is 90 degree. The application of the four-station translational and rotary worktable can achieve multi-step continuous process, save workspace and improve production efficiency. © (2014) Trans Tech Publications, Switzerland.

Xu D.D.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

To solve the problem about vehicles passing deceleration strip consumming a large amount of energy, it can improve the efficiency of the deceleration strip generating electricity by improving the existing mechanical power or gas-liquid pavement power transmission part, using the buffer device and conversion device to change the stress state of rack and pinion, combining the working characteristics of one-way clutch with bevel gear transmission characteristic.the result shows that the power generation device design is reasonable and the economical profit is remarkable. © (2014) Trans Tech Publications, Switzerland.

Liu J.S.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

For the assembly line balancing problem, the purpose of adopting genetic algorithm is to balance the average operation time of each work-station. In this paper, we elaborate the main factors that affect the genetic algorithm. Then evaluation functions are brought in the study to evaluate the simulation model based on eM-Plant. Finally the feasibility of this applied technology is verified by the example. © (2014) Trans Tech Publications, Switzerland.

Qiu T.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

A comparable study on the effects of pristine and functionalized single-walled carbon nanotubes on schwann cells were conducted. Schwann cells were co-cultured with three types of SWNTs, purified raw SWNTs (C), hydroxyl purified SWNTs (C-OH) and carboxyl purified SWNTs (C-COOH) at 25μg/mL. C-COOH promoted the cell viability after 72h exposure and sustained its redox states by enhancing GPx expression. On the contrary, C and C-OH weaken the antioxidant activity due to the inhibition in main antioxidant enzymes and further led to the decline in cell viability. Carboxyl modification of the SWNTs helps to improve the biocompatibility of the SWNTs by strengthening the antioxidant ability. © (2014) Trans Tech Publications, Switzerland.

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.

Yu J.,Wuhan University of Technology | Shi L.,Wuhan University of Technology
Journal of Molecular Catalysis A: Chemical | Year: 2010

Trifluoroacetic acid (TFA) modified TiO2 (TFA-TiO2) hollow microspheres were prepared by one-pot hydrothermal treatment of Ti(SO4)2 in the presence of TFA at 180 °C for 12 h. The prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption isotherms and Fourier transform infrared. The production rates of {radical dot}OH on the surface of UV-illuminated TiO2 were detected by a photoluminescence (PL) method using terephthalic acid (TA) as probe molecule. The photocatalytic activity was evaluated by the photocatalytic decomposition of acetone in air under UV light illumination. The results show that TFA not only induces the formation of hollow microspheres, but also enhances their crystallization. The molar ratios of TFA to Ti(SO4)2 (R) have a great influence on photocatalytic activity. When R is in the range of 0.5-5, the photocatalytic activity of the samples is higher than that of commercial Degussa P25 TiO2 powders (P25) and pure TiO2 samples. At R = 2, the photocatalytic activity of the sample reaches the highest and exceeds that of P25 by a factor of more than two times. This is ascribed to the fact that the former has hollow interior and bimodal mesoporous shells enhancing harvesting of light and the transfer and transport of reactant and product molecules, also, the surface-adsorbed TFA can reduce the recombination of photo-generated electrons and holes. © 2010 Elsevier B.V. All rights reserved.

Guo S.,Wuhan University of Technology | Zhang G.,Wuhan University of Technology | Guo Y.,Wuhan University of Technology | Yu J.C.,Wuhan University of Technology | Yu J.C.,Chinese University of Hong Kong
Carbon | Year: 2013

Graphene oxide-Fe2O3 (GO-Fe2O3) hybrid material was synthesized as a heterogeneous catalyst for photo-Fenton degradation of organic contaminants by an easy and scalable impregnation. X-ray diffraction analysis and high-resolution transmission electron microscope analysis confirm the existence of the Fe2O3 nanoparticles in the GO-Fe2O3 catalyst. Fourier transform infrared spectroscopy analysis proves that the combination of Fe2O3 and GO sheet is due to the metal-carbonyl coordination. The catalytic activities of the GO-Fe2O3 catalyst were evaluated by the degradation of Rhodamine B and 4-nitrophenol under visible light irradiation (>420 nm) in the presence of hydrogen peroxide. The results show that the catalyst exhibited excellent catalytic property at a wide pH range of 2.09-10.09 and stable catalytic activity after seven recycles, which could be attributed to the synergetic effects of the adsorptive power of GO and the hydroxyl radicals produced by heterogeneous photo-Fenton reactions. The present results suggest that the GO-Fe2O3 hybrid material can act as an efficient heterogeneous catalyst for degradation of organic contaminants, which may provide insight into the design and development of high-efficiency visible-light photocatalyst for water treatment. © 2013 Elsevier Ltd. All rights reserved.

Chen M.,Wuhan University of Technology | Wu S.,Wuhan University of Technology | Wang H.,Wuhan University of Technology | Zhang J.,Wuhan University of Technology
Solar Energy Materials and Solar Cells | Year: 2011

This paper investigates the snow melting process on asphalt pavements as solar collector by experiments and numerical simulation. A numerical simulation method was used to predict the general design requirements for snow melting system of asphalt pavements, and a type of experimental asphalt snow melting system has been built using the design parameters obtained from the preceding simulation. Graphite powders were used to improve the thermal conductivity of asphalt concrete and thus resulting in an improved efficiency of asphalt collector. A laboratory snow melting test was performed after real snowstorm events. The effects of thermal conductive asphalt concrete (CAC) on snow melting performance and asphalt pavement temperature distribution were evaluated. The heat transfer in the asphalt slabs and the heat requirement for the snow melting were analyzed. The results that are obtained show that asphalt solar collector (ASC) provides us a better alternative method for snow melting. The higher fluid temperature is a positive way to improve the performance of snow melting system. However, it is unnecessary to keep a too high fluid temperature so as to reduce the waste of energy. The non-uniform temperatures in the asphalt slabs are noticeable. Furthermore, the heat-transmission and the snow melting performance can be enhanced using CAC. © 2011 Elsevier B.V. All rights reserved.

Zhang Z.,Wuhan University of Technology
Energy Materials 2014, Conference Proceedings | Year: 2014

Environmentally assisted cracking (EAC) of armour wires in flexible pipes, power cables and umbilicals is a major concern with the development of oil and gas fields and wind farms in harsh environments. Hydrogen induced cracking (HIC) or hydrogen embrittlement (HE) of steel armour wires used in deep-water and ultra-deep-water has been evaluated. Simulated tests have been carried out in simulated sea water, under conditions where the susceptibility is the highest, i.e. at room temperature, at the maximum negative cathodic potential and at the maximum stress level expected in service for 150 hours. Examinations of the tested specimens have not revealed cracking or blistering, and measurement of hydrogen content has confirmed hydrogen charging. In addition, sulphide stress cracking (SSC) and chloride stress cracking (CSC) of nickel-based alloy armour wires used in harsh down-hole environments has been evaluated. Simulated tests have been carried out in simulated solution containing high concentration of chloride, with high hydrogen sulphide partial pressure, at high stress level and at 120 °C for 720 hours. Examinations of the tested specimens have not revealed cracking or blistering. Subsequent tensile tests of the tested specimens at ambient pressure and temperature have revealed properties similar to the as-received specimens.

Dai J.,Wuhan University of Technology | Yang M.,Wuhan University of Technology | Chen Y.,Wuhan University of Technology | Cao K.,China Academy of Engineering Physics | And 2 more authors.
Optics Express | Year: 2011

WO3-Pd composite films were deposited on the side-face of side-polished fiber Bragg grating as sensing elements by magnetron sputtering process. XRD result indicates that the WO3-Pd composite films are mainly amorphous. Compared to standard FBG coated with same hydrogen sensitive film, side-polished FBG significantly increase the sensor's sensitivity. When hydrogen concentrations are 4% and 8% in volume percentage, maximum wavelength shifts of side-polished FBG are 25 and 55 pm respectively. The experimental results show the sensor's hydrogen response is reversible, and side-polished FBG hydrogen sensor has great potential in hydrogen's measurement. © 2011 Optical Society of America.

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.

Liu Q.,Wuhan University of Technology | Zhao X.,Wuhan University of Technology
Journal of Non-Crystalline Solids | Year: 2010

Some chalcogenide and chalcohalide glasses were synthesized. The third-order non-linearity was investigated experimentally by the Optical Kerr effect. The results indicated that amorphous chalcogenide films showed a very fast response in the range of 200 fs under ultrafast excitation. The ultrafast response and large third-order non-linearity are attributed to the ultrafast distortion of the electron orbits surrounding the average positions of the nucleus of atoms. With Maker fringe measurements, obvious Second Harmonic generation was observed in the chalcohalide glasses by the thermal/electrical poling, which was related to the moving and aligning of the dipoles in the glasses. Copyright © 2010 Published by Elsevier B.V. All rights reserved.

Xu Z.,Wuhan University of Technology | Xu Z.,Huanggang Normal University | Yu J.,Wuhan University of Technology
Nanotechnology | Year: 2010

Many amines are proven or suspected to be carcinogenic and have been implicated in inducing cancer of the bladder. Therefore, the monitoring of their levels in environmental samples is important for the protection of health and the environment. Herein, a novel method for effective immobilization of Ru(bpy)3 2 + on the electrode surface of TiO2 nanotube arrays(TNs) is developed for the first time. The method involves Ru(bpy)3 2 + spontaneously adsorbed on the surface of negatively charged TiO2 nanotubes due to electrostatic interaction to produce a Ru(bpy)3 2 + /TNs/Ti (Ru-TNs-Ti) solid-state electrochemiluminescence(ECL) sensor. The prepared solid-state sensor was used to detect the changes of concentrations of pollutant tripropylamine(TPA) in water. The sensor exhibits excellent ECL behavior, very good stability and high sensitivity. This study may provide new insight into the design and preparation of an advanced solid-state ECL sensor for monitoring of amines in water. © 2010 IOP Publishing Ltd.

Liu J.,Wuhan University of Technology | Zhang G.,Wuhan University of Technology | Yu J.C.,Wuhan University of Technology | Yu J.C.,Chinese University of Hong Kong | Guo Y.,Wuhan University of Technology
Dalton Transactions | Year: 2013

In this study, Zn2GeO4 hollow spheres were successfully fabricated by a template-engaged approach using zinc hydroxide carbonate (Zn4CO3(OH)6·H2O, ZHC) spheres as the template. During the hydrothermal process, Zn2+ dissolved from the surface of the ZHC spheres could rapidly react with the HGeO3 - in solution and the Zn2GeO4 outer shell was formed in situ. Moreover, the building units of the Zn 2GeO4 hollow spheres could gradually transform from the nanoparticles into nanobundles with the increase of the reaction time. The photocatalytic degradation results indicate that the Zn2GeO 4 hollow spheres exhibited high photocatalytic activity and excellent stability for the degradation of antibiotic metronidazole in solution. Finally, the radical species involved in the degradation process have been investigated by using the scavenger experiments. © 2013 The Royal Society of Chemistry.

Wei L.,Wuhan University of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

A lowcost Fiber Bragg Grating (FBG) Sensing System based on code division multiplexing access (CDMA) technology is proposed. The system using semiconductor optical amplifier and a broadband source is experimented. Without a tunable laser source or electro-optic switch driven, the price of system is very low. CDMA is used to separate each reflected sensor. The experimental results show that theory is correct. © 2013 SPIE.

Jin J.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Yu J.,King Abdulaziz University | Guo D.,Wuhan University of Technology | And 2 more authors.
Small | Year: 2015

The development of an artificial photosynthetic system is a promising strategy to convert solar energy into chemical fuels. Here, a direct Z-scheme CdS-WO3 photocatalyst without an electron mediator is fabricated by imitating natural photosynthesis of green plants. Photocatalytic activities of as-prepared samples are evaluated on the basis of photocatalytic CO2 reduction to form CH4 under visible light irradiation. These Z-scheme-heterostructured samples show a higher photocatalytic CO2 reduction than single-phase photocatalysts. An optimized CdS-WO3 heterostructure sample exhibits the highest CH4 production rate of 1.02 μmol h-1 g-1 with 5 mol% CdS content, which exceeds the rates observed in single-phase WO3 and CdS samples for approximately 100 and ten times under the same reaction condition, respectively. The enhanced photocatalytic activity could be attributed to the formation of a hierarchical direct Z-scheme CdS-WO3 photocatalyst, resulting in an efficient spatial separation of photo-induced electron-hole pairs. Reduction and oxidation catalytic centers are maintained in two different regions to minimize undesirable back reactions of the photocatalytic products. The introduction of CdS can enhance CO2 molecule adsorption, thereby accelerating photocatalytic CO2 reduction to CH4. This study provides novel insights into the design and fabrication of high-performance artificial Z-scheme photocatalysts to perform photocatalytic CO2 reduction. A highly efficient direct CdS-WO3 Z-scheme photocatalyst, CdS nanoparticles in situ grown on a hierarchical WO3 hollow sphere surface, is designed and fabricated for photocatalytic CO2 reduction to CH4. The enhanced CO2 reduction activity is observed due to the formation of a CdS-WO3 Z-scheme photocatalytic system. © 2015 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.

Yang M.,Wuhan University of Technology | Xie W.,Wuhan University of Technology | Dai Y.,Wuhan University of Technology | Lee D.,Wuhan University of Technology | And 3 more authors.
Optics Express | Year: 2014

A multilayer-based fiber optic sensor enabling simultaneous measurement of humidity and temperature is proposed and demonstrated. The sensitive elements were multilayer coatings consisting of nano-porous TiO2 and SiO 2 films, which were deposited on fiber end-face to form a Fabry-Perot (F-P) filter structure. Relative-humidity (RH) sensing is correlated with the shift of interference fringe due to the change of effective refractive index of porous coatings when exposed to different RH environments. The sensor is sealed in a glass tube in case of temperature measurement. Experimental results show that the average sensitivity are 0.43nm/%RH and 0.63nm/°C respectively when environmental RH changes from 1.8%RH to 74.7%RH and temperature changes from 21.4°C to 38.8°C. The proposed sensors present high repeatability, and especially highly sensitive to lower moisture measure. © 2014 Optical Society of America.

Liu Y.,Huazhong University of Science and Technology | Liu Y.,Arizona State University | Liu J.,Huazhong University of Science and Technology | Lin Y.S.,Arizona State University | Chang M.,Wuhan University of Technology
Journal of Physical Chemistry C | Year: 2014

Wang J.F.,Wuhan University of Technology
Advanced Materials Research | Year: 2014

This article is aimed at a kind of rotary type desk that can move, so we designed a scissor-type lifting mechanism and use MATLAB to optimize it's rod length so as to prove the rationality of mechanism design. © (2014) Trans Tech Publications, Switzerland.

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 J.,Wuhan University of Technology | Kang X.,Wuhan University of Technology | Hu L.,Wuhan University of Technology | Gong X.,Wuhan University of Technology | Mu S.,Wuhan University of Technology
Journal of Materials Chemistry A | Year: 2014

The P21/n structured nanocrystalline-Li2FeSiO 4 is prepared by a confinement effect of three-dimensional conductive carbon frameworks, which are formed through a chelating reaction and subsequent pyrolysis. As a benefit of enhanced electronic conductivity by carbon frameworks and Li-ion diffusion kinetics by nanocrystalline-Li 2FeSiO4 architectures, the novel nanocomposite shows a 1.28 Li-ion storage capacity (211.3 mA h g-1) at 0.1 C, corresponding to two successive steps of oxidation and reduction of Fe2+/Fe 3+/Fe4+. Furthermore, the discharge capacity is 189.8, 175.6, 148.9, 125.7 and 106.6 mA h g-1 at a variable rate of 0.5, 1, 2, 5 and 10 C, respectively, and then easily returns to 175 mA h g-1 at 1 C. It is a surprise that the initial capacity is 90.9 mA h g-1 at 10 C, and 97.7% is retained after 1000 cycles. Thus, we believe that the nanocrystalline-Li2FeSiO4 with carbon frameworks, possessing high-capacity and high-rate performance, is a promising next-generation cathode material for high-power lithium-ion batteries. © 2014 the Partner Organisations.