Entity

Time filter

Source Type

Taiyuan, China

Taiyuan University of Technology is a university in Shanxi, People's Republic of China, under the authority of the provincial government. In 2012 it celebrated its 110th anniversary. It is listed officially as one of the 'Top 100 universities in China', according to the Chinese government. Wikipedia.


Gao W.,Toyota Technological Institute | Liao M.,Toyota Technological Institute | Yang L.,Taiyuan University of Technology | Yan X.,Toyota Technological Institute | And 2 more authors.
Applied Optics | Year: 2012

We demonstrate an all-fiber broadband supercontinuum (SC) source with high efficiency in a step-index high nonlinear silica fiber, which was pumped by a 1557 nm subpicosecond-pulse laser in the normal dispersion region. The broad SC spectrum covers the spectral range from 840 to 2390 nm, and the 10 dB bandwidth from 1120 nm to 2245 nm of the SC covers one octave, assuming the peaks near 1550 nm were filtered. The SC source system is constructed by all-fiber components, which can be fusion-spliced together directly with low loss, less than 0.1 dB. Thus the SC source has high energy transfer efficiency from the pump source. The maximum SC average power of 332 mW is obtained, including the peaks near 1550 nm. The spectral density for the 10 dB bandwidth is in the range from -17.3 to-7.3 dBm/nm. © 2012 Optical Society of America. Source


Liu F.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

Nuclear Power Station is the last bulwark of the nuclear reactors, and the seriousness of the consequences due to the damage and the enormous impact of human psychology, the seismic response analysis of nuclear power plants is essential. MIDAS/Gen finite element model of the structure of the space, for example, a nuclear power plant, the power of the research containment structure under horizontal seismic response characteristics and undermine the law, the natural frequency of the structure, shapes characteristics, structure the displacement distribution parameters, provides a basis for the design of the structure and to provide a reference for similar studies. © (2013) Trans Tech Publications, Switzerland. Source


Tang Y.,Taiyuan University of Technology
Arabian Journal of Geosciences | Year: 2015

As a kind of global disaster, the methane hazards extensively exist in the major coal-production countries. At present, conventional techniques, such as ventilation or drilling bore in coal seam, fail to completely solve the methane problem. To improve the methane drainage efficiency, a new method called roof-borehole, instead of traditional drainage methods (laying pipes in goaf and drilling hole in coal seam), was used to manage the gas disaster in goaf. Therefore, this study used the physical simulation experiment to study and determine the distribution characteristics of the fissure zone and methane zone in the overlying strata of coal seam and the necessary parameters of roof-borehole in turn. In addition, according to the experiment results, the optimal parameters for the position of roof-borehole (vertical distance and horizontal distance) were designed. By testing the effects of different drainage methods in field, it was found that the efficiency of methane drainage was significantly improved by the roof-borehole. © 2015 Saudi Society for Geosciences Source


Kang T.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

Structure in horizontal wind load produce lateral displacement, vertical load may have caused additional effects due to the lateral displacement and deformation of the cumulative increase leads to structural instability collapse. Due to the characteristics and problems of the structure, utilizing SAP2OOO finite element software, this paper consider the deformation of the lateral displacement of the second-order effects under wind loads and loads of the Shanxi Taiyuan Xiaodian a tall steel frame structure. © (2013) Trans Tech Publications, Switzerland. Source


Yang W.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

Determination of main impact factors of river health is important to river management, ecological rehabilitation and construction. Based on the definition of river health in China, the factors were divided into two categories, that is, endogenous factors and exogenous factors. The method used to main impact factor analysis was suggested which is based on the relation between the factors and the partial least squares regression. The model was applied to analyze main impact factors of river health of the lancun-Yitang reach in the middle Fenhe River. The result shows that the proposed model can reflect the actual situation. © (2012) Trans Tech Publications, Switzerland. Source


Zhang C.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

Improper waste disposal will affect the travel experience of tourists, endanger human health. This paper demonstrats the definition of travel rubbish,the system of source classification, the classification system of physical and chemical properties, the system classification of collection and transfer system, treatment and disposal methods, the grade division of disposal scale and so on ,which has a good guidance to the management of travel rubbish. © (2012) Trans Tech Publications, Switzerland. Source


Zhao C.,University of Hertfordshire | Chen Y.K.,University of Hertfordshire | Chen Y.K.,Taiyuan University of Technology | Ren G.,University of Hertfordshire
Tribology Transactions | Year: 2013

This article presents an investigation on the potential tribological properties of water-based cerium dioxide nanofluids. Nanofluids with different nanoparticle concentrations were prepared in a materials laboratory. A stable dispersion of nanoparticles in the fluids was achieved with an appropriate percentage of the surfactant sorbitan monostearate. The stability of particle dispersion was studied using zeta potential measurement. Additive conglomerate size in the nanofluids was measured using dynamic light scattering. It was observed that the dispersibility of nanoparticles played an important role in the frictional properties of the nanofluids. The tribological properties of the water-based nanofluids were evaluated using a pin-on-disc tester under different loading conditions. A significant improvement in the tribological properties of the waterbased cerium dioxide nanofluids was observed. The worn surfaces of the contact elements were characterized using scanning electron microscopy (SEM) and a nanotester. According to the test results, the significant reductions in the friction coefficients and antiwear properties of water-based cerium dioxide nanofluids were attributed to the deposition of nanoparticles on worn contact surfaces. © Society of Tribologists and Lubrication Engineers. Source


Rahimi B.,University of Western Australia | May J.,University of Western Australia | Regenauer-Lieb K.,University of New South Wales | Chua H.T.,Taiyuan University of Technology | Chua H.T.,University of Western Australia
Desalination | Year: 2015

Two novel desalination processes that utilise low grade sensible heat sources have been modelled and both have been shown to be more thermally efficient means of desalinating water than conventional Multi Effect Distillation (MED). The novel Boosted MED (B-MED) and Flash Boosted MED (FB-MED) processes are capable of higher production rates than conventional MED, enabled by the addition of process components and by an increase in specific electrical power consumption. A simple method of estimating the capital and operational costs of MED, B-MED and FB-MED desalination installations is presented. A generalised comparison of the economics of these three processes is conducted, asserting the economic viability of the novel desalination processes. © 2015 Elsevier B.V. Source


Luong-Van H.,Ho Chi Minh City University of Technology | Nguyen-Thoi T.,Ton Duc Thang University | Liu G.R.,Taiyuan University of Technology | Liu G.R.,University of Cincinnati | Phung-Van P.,Ton Duc Thang University
Engineering Analysis with Boundary Elements | Year: 2014

A cell-based smoothed finite element method using three-node Mindlin plate element (CS-FEM-MIN3) based on the first-order shear deformation theory (FSDT) was recently proposed for static and dynamic analyses of Mindlin plates. In this paper, the CS-FEM-MIN3 is extended and incorporated with damping-spring systems for dynamic responses of sandwich and laminated composite plates resting on viscoelastic foundation subjected to a moving mass. The plate-foundation system is modeled as a discretization of three-node triangular plate elements supported by discrete springs and dashpots at the nodal points representing the viscoelastic foundation. The position of the moving mass with specified velocity on triangular elements at any time is defined, and then the moving mass is transformed into loads at nodes of elements. The accuracy and reliability of the proposed method is verified by comparing its numerical solutions with those of others available numerical results. A parametric examination is also conducted to determine the effects of various parameters on the dynamic response of the plates on the viscoelastic foundation subjected to a moving mass. © 2013 Elsevier Ltd. All rights reserved. Source


Huang X.,Taiyuan University of Technology | Lin J.,CAS Changchun Institute of Applied Chemistry
Journal of Materials Chemistry C | Year: 2015

In recent years, intensive research efforts around the world have been devoted to lanthanide-doped upconversion nanoparticles because of their promising application in biological imaging. However, the overheating issue caused upon 980 nm laser irradiation in conventional Yb3+-based nanoparticles is needed to be addressed, and thus Nd3+/Yb3+-based upconversion nanoparticles with 808 nm excitation are investigated as promising alternatives because they can significantly decrease the optical absorption of water. Due to the cascade sensitization process, Nd3+/Yb3+-based upconversion nanoparticles, however, always suffer from the intrinsic low luminescence efficiency. To solve this problem, here we proposed the active-core/active-shell nanostructured design as an effective strategy for upconversion improvement of Nd3+/Yb3+-based upconversion nanoparticles. We found that after growing an optimized active-shell containing both Nd3+ and Yb3+ ions, a maximum 522-fold enhancement in upconversion luminescence was realized upon excitation at 808 nm. These findings would be of great importance to the community developing high-performance upconversion nanoparticles for bioimaging applications. © The Royal Society of Chemistry 2015. Source


Yan Y.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

According to the sloping roof engineering characteristics of multi-storied buildings, summarized from architectural design, structural design and other aspects, the roof forms, slope, structure, drainage organization, ventilation, lighting, lightning protection and other related issues were discussed in this paper. The common problems about changing the plane roof to the sloping roof in the old buildings, such as deal with the water tanks, inner courtyard and solar water heaters of the old buildings were also investigated in this paper. The design methods and ideas of dealing with the sloping roof series' design problems were proposed. Some reasonable suggestions about structural analysis methods, key parts of the sloping roof, cornice and plinth were given as references for the future selection of sloping roof scheme, design and other aspects of treatment. In southern China, climate is rainy and humid. In order to draining the rain water facilitate and timely and make full use of headspace emissions, the top of the building was set a loft. But Affacted by the traditional architectural style, urban renewal requirements, the use of sloping roof was increased developed rapidly in the north of China, such as Beijing, Shanghai, Jinan, Qingdao, Taiyuan and other cities [1-3]. In recent years, the proportion of using sloping roof in new residential is higher. The house located on both sides of the landscape road in the city's main, regardless of North and South, and weather conditions, was required to change the plane roof to the sloping roof(hereinafter referred to as "plane to slope"), named as "crowned hats". Even in some places, the requirement of plane to slope was written in planning and administration provisions. The battle of the plane roof and sloping roof in domestic is very intense [4-14], the main points are as follow: (1) Sloping roof is construct waterproofing while flat roof is material waterproofing. The use of plane roof is the technological progress. (2) The old residential buildings's plane roofs leaked severely, repair times shorter, and the cost higher,"pane to slope" is an effective way. (3) Old plane roof residential buildings are hot in summer and cold in winter. " pane to slope " transform's energy-saving effect is very good. (4) Under the requirements of sunshine spacing, using the sloping roof of the building can increase its height.add a slope top, increased the building area and beautify the urban landscape. (5) With the improved requirements of the building comfortable, the top sloping roof can be used as the "second line of defense" of waterproof and thermal insulation. The advantages and disadvantages of the sloping roof were not discussed in this paper. However, the sloping roof in a large number of practical engineering applications is an objective fact, sloping roof and the substructure is often quite different, future maintenance is aerial work, construction difficult and higher risk. Therefore, as designers, to ensure the structural safety of the roof slope is very important. How to considering the issues related to the sloping roof design and what is the solutions will be the main contents of this paper. Source


Li M.,Taiyuan University of Technology | Wen P.H.,Queen Mary, University of London
International Journal for Numerical Methods in Engineering | Year: 2014

SUMMARY: Based on the one-dimensional differential matrix derived from the Lagrange series interpolation, the finite block method is proposed first time to solve both stationary and transient heat conduction problems of anisotropic and functionally graded materials. The main idea is to establish the first order one-dimensional differential matrix constructed by using Lagrange series with uniformly distributed nodes. Then the higher order of derivative matrix for one-dimensional problem is obtained. By introducing the mapping technique, a block of quadratic type is transformed from Cartesian coordinate (xyz) to normalised coordinate (ξης) with 8 seeds or 20 seeds for two or three dimensions. Then the differential matrices in physical domain are determined from that in normalised transformed coordinate system. In addition, the time dependent partial differential equations are analysed in the Laplace transformed domain, and the Durbin inversion method is used to determine the values in time domain. Illustrative two-dimensional and three-dimensional numerical examples are given, and comparisons have been made with analytical solutions. © 2014 John Wiley & Sons, Ltd. Source


Chen X.-B.,Beijing University of Posts and Telecommunications | Xu G.,Taiyuan University of Technology | Yang Y.-X.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications
International Journal of Theoretical Physics | Year: 2010

In this paper, a new and efficient quantum protocol which allows a group of mutually distrustful players to perform the summation computation is proposed. Different from previous protocols, we utilize the multi-particle entangled states as the information carriers. A third party, i.e. TP, is assumed semi-honest in the two-party quantum summation protocol. All various kinds of outside attacks and participant attacks are discussed in detail. In addition, we code all players' Bell-basis measurement outcomes into one classical bit (cbit). Not only the cost of classical information in the public communication network is decreased, but also the security of the protocol is improved. The protocol is also generalized into multi-party quantum summation. It is secure for the collusive attack performed by at most n-2 players. © 2010 Springer Science+Business Media, LLC. Source


Yao X.-L.,Taiyuan University of Technology | Liu Y.,Harbin Institute of Technology | Liu Y.,Ecole Polytechnique - Palaiseau | Yan X.,University of Management and Economics
Energy Policy | Year: 2014

A one-year subsidy program for energy-efficient home appliances has been implemented in China. We construct a dataset consisting of participant and non-participant households in both urban and rural areas of Rizhao city. By applying a quantile regression and counterfactual analysis, this study disentangles the impact of this subsidy program and inherent household attributes on per capita residential electricity consumption. First, contrary to the mean regression, the elasticity of electricity consumption to household[U+05F3]s income, age, education and energy-saving awareness, varies markedly across the electricity consumption distribution and shows discrepancy between urban and rural areas. Second, while inherent household attributes are identified as a primary determinant to the changes in residential electricity consumption, the effect induced by the subsidy incentive is more significant at the middle of the electricity consumption distribution than at the tails. Third, there are significant rebound effects that lead to overall increase in household electricity consumption. Our results suggest that the disparity between urban and rural regions and targeted consumer behavior changes should be taken into account to ensure the effectiveness of a future energy-efficient subsidy program. © 2014 Elsevier Ltd. Source


Rui-Gang Y.,Taiyuan University of Science and Technology | Rui-Gang Y.,Taiyuan University of Technology
Journal of Magnetism and Magnetic Materials | Year: 2011

BaTiO3 powders are prepared by solgel method. The carbonyl iron powder is prepared via thermal decomposition of iron pentacarbonyl. Then BaTiO3carbonyl iron composite with different mixture ratios was prepared using the as-prepared material. The structure, morphology, and properties of the composites are characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, scanning electron microscopy (SEM), and a network analyzer. The complex permittivity and reflection loss of the composites have been measured at different microwave frequencies in S- and C-bands employing vector network analyzer model PNA 3629D vector. The effect of the mass ratio of BaTiO3/carbonyl iron on the microwave loss properties of the composites is investigated. A possible microwave absorbing mechanism of BaTiO3carbonyl iron composite has been proposed. The BaTiO3carbonyl iron composite can find applications in suppression of electromagnetic interference, and reduction of radar signature. © 2011 Elsevier B.V. All rights reserved. Source


Li H.,University of Shanghai for Science and Technology | Feng D.,University of Shanghai for Science and Technology | Song J.,Taiyuan University of Technology
Dianwang Jishu/Power System Technology | Year: 2013

The overall online healthy assessment is the best strategy for the balance between the economy and the reliability of power equipment, this paper focuses on the online healthy condition-based assessment model of the medium voltage (MV) vacuum circuit breakers (VCB). Various performance indices are firstly proposed to assess the VCB's condition by analyzing the fault characteristics of its main components. Then, the perfection degree is defined to make the sampling data normalized. Based on indices coupling relationships, the weights are determined with analytic hierarchy process (AHP). The entropy is employed to quantify the nonequilibrium impairment of all indices. Finally, an improved radar chart method with eigenvalue calculating algorithm is applied to the VCB's condition assessment. In the method, the reference samples considering the impairment speed in thresholds design, especially the nonequilibrium entropy are incorporated to ensure VCB's safety early warning adequately and timely. The test results on monitoring 10 kV VCB show that the model is concise, intuitive and feasible. Source


Xu H.,Taiyuan University of Technology | Guo C.-Y.,University of Chinese Academy of Sciences
European Polymer Journal | Year: 2015

Polyethylene (PE) and ethylene copolymers (ECP) play significant roles in modern society. Molecular sieves (MS) act as both the catalyst support and nanoreactor for ethylene (co)polymerization. Mesoporous molecular sieves (MMS, typically MCM-41 and SBA-15) offer suitable pore sizes for ethylene (co)polymerizations to proceed in an extrusion mode in which the formation of polymeric nano-fibers composed of extended polymer chains from the nanopores of MMS is completed in one step. Additionally, the PE and ECP are compounded with MMS particles to form polymer nanocomposites when the MMS framework collapses due to polymeric chain growth and/or enormous polymerization exotherms. Such a unique methodology integrates numerous merits into one and endows the resultant ethylene (co)polymers with significant advantages, such as increased molecular weights and their distribution, elevated strength and modulus, and improved processability. This review addresses the progress in ethylene (co)polymerization catalyzed by organometallic complexes (pre-catalysts) immobilized onto various molecular sieves and property investigation on the resultant polymers over the past 16 years. This article comprises three major parts which focus on pre-catalysts immobilization, ethylene (co)polymerization in different molecular sieves, and the structure and properties of the as-prepared ethylene (co)polymer nanocomposites. Finally, the outlook for future research and development trends is proposed. © 2014 Elsevier Ltd. All rights reserved. Source


Wang X.,Taiyuan University of Technology
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2013

Aiming at reasonable parameters approximation for the electro-hydraulic servo system, and parameters offset due to temperature changes caused, and as well as system inherent in the dead zone, hysteresis effect nonlinear factors, analysis of approximate dynamic mathematical model based on the position of the servo proportional valve control. On the basis of conventional PID, fuzzy PID control is proposed to be applied to the servo proportional valve controlled cylinder system. And joint simulation results showed that the Fuzzy PID control system based on servo proportional valve electro-hydraulic servo system, compared with the traditional PID control system has a fast response, short rise time, overshoot characteristics. This in theory of electro-hydraulic servo control system has certain reference significance. © Sila Science. Source


Wang G.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

This paper uses the SAP2000 to establish different beam column connections of steel frame structure finite element model, comparative analysis of the beam column for the rigid connection, hinged, semi-rigid connections of steel frame structure, the dynamic characteristics of structure displacement and internal force influence. At the same time, the dynamic time-history analysis method for structural displacement supplementary checking, analysis of structural response to seismic wave degree. The results showed that compared with rigid, the structure of semi-rigid connections to the larger natural period and with the rotation stiffness decreases vibration period increases; Semi-rigid steel frame connection to reduce the resistance to push the layer stiffness making the structure of the horizontal displacement increased. © (2013) Trans Tech Publications, Switzerland. Source


Qiao Z.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

In a grid renovation project, the use of prestressed reinforcement technology, using SAP2000 software analysis, puts forward the reinforcement scheme, so that the grid to meet the use requirements. © (2013) Trans Tech Publications, Switzerland. Source


Zhou R.,Taiyuan University of Technology | Zhou R.,Nankai University | Duan C.,Nankai University | Yang C.,Nankai University | He Z.,Nankai University
Chemistry - An Asian Journal | Year: 2014

A phosphane-catalyzed [4+1] annulation between nitroalkenes and Morita-Baylis-Hillman carbonates has been realized; this provides facile and diastereoselective access to polysubstituted isoxazoline N-oxides in moderate to excellent yields. In the annulation, an in situ formed allylic phosphorus ylide presumably serves as a pivotal active intermediate. This reaction accordingly represents the first example of phosphorus ylide initiated [4+1] cyclization of nitroalkenes to give isoxazoline N-oxides. Initiation procedure: A new phosphane-catalyzed [4+1] annulation between nitroalkenes and Morita-Baylis-Hillman carbonates is reported; this provides facile and efficient synthesis of isoxazoline N-oxides (see scheme; Boc=tert-butoxycarbonyl). This reaction represents the first example of phosphorus ylide initiated [4+1] cyclization of nitroalkenes. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Tang Y.,Taiyuan University of Technology
Journal of Loss Prevention in the Process Industries | Year: 2015

As a harmful gas in underground coal mine, CO seriously threatened the safety of miners. Currently, the spontaneous combustion of residual coal in goaf is generally considered as the main source of underground CO. CO gas is also widely used as an indicator gas in fire prediction in mines. However, high concentrations of CO are also detected in some mines without spontaneous combustion of coal. Therefore, in the paper, with four ranks of coal, we studied other two potential CO sources: crushing and oxidation at ambient temperature. The more completely crushed coal produces more CO. The concentration of generated CO is inversely proportional to moisture content in coal. Therefore, the addition of water can inhibit the generation process of CO during the crushing process of coal. Lignite with low metamorphic grade can be oxidized to produce CO at ambient temperature (25 °C), and anthracite with high coal rank can be only oxidized to produce CO at 60 °C. Infrared spectra indicated that the coal with rich aliphatic hydrocarbons and oxygen-containing functional groups are more susceptible to oxidation at room temperature. Moreover, the smaller particle size of coal is more beneficial to the oxidation at ambient temperature to generate CO. CO generation during coal oxidation is also closely related to the ventilation rate. © 2015 Elsevier Ltd. Source


Guo R.,Taiyuan University of Technology
Advanced Materials Research | Year: 2013

Steel fiber reinforced concrete is a new type of composite material developed rapidly in recent years. It is widely used in various types of engineering construction field with its good crack resistance, flexural toughness and impact resistance. Meanwhile, Steel fiber reinforced concrete has high tensile strength and fracture toughness, fatigue resistance, and forming pouring easy, for variety of complex stress position of the structure. This paper provides something for this new concrete materials in the project of the building structure design and construction, through the introduction of the main performance of steel fiber reinforced concrete. © (2013) Trans Tech Publications, Switzerland. Source


Li M.,Taiyuan University of Technology | Chen C.S.,University of Southern Mississippi | Hon Y.C.,City University of Hong Kong
Engineering Analysis with Boundary Elements | Year: 2011

In this paper the method of fundamental solutions (MFS) and the method of particular solution (MPS) are combined as a one-stage approach to solve the Cauchy problem for Poisson's equation. The main idea is to approximate the solution of Poisson's equation using a linear combination of fundamental solutions and radial basis functions. As a result, we provide a direct and effective meshless method for solving inverse problems with inhomogeneous terms. Numerical results in 2D and 3D show that our proposed method is effective for Cauchy problems. © 2010 Elsevier Ltd. All rights reserved. Source


Liu X.,Nanyang Technological University | Loh P.C.,Nanyang Technological University | Wang P.,Nanyang Technological University | Han X.,Taiyuan University of Technology
IEEE Transactions on Power Electronics | Year: 2012

Z-source energy conversion is a recent concept introduced for adding voltage-boost functionality to the traditional buck-only dc-ac inverter. The same concept can equally be extended to the indirect ac-ac matrix converter, where only a single Z -source impedance network needs to be inserted to its intermediate dc link. The topology formed is, thus, quite straightforward. Its modulation is, however, nontrivial if advantages like buck-boost flexibility, minimum commutation count, ease of implementation, and sinusoidal input and output quantities are to be attained simultaneously. This capability is now pursued through unveiling related modulation theories, so as to better present the indirect Z-source matrix converter as an attractive alternative for ac-ac buck-boost energy conversion. Findings presented have already been verified in simulation and experiment. © 2012 IEEE. Source


Cui J.L.,Ningbo University of Technology | Zhang X.J.,China University of Mining and Technology | Deng Y.,Beihang University | Fu H.,China University of Mining and Technology | And 3 more authors.
Scripta Materialia | Year: 2011

α-In2Se3 has a two-layer structure with 1/3 of the cation sites vacant. After addition of Ag to In2Se3, we identified the main phase as In5AgSe8 with nanoinclusions of InSe forming in situ. Ag incorporation favors the formation of Ag2Se slab, which is largely responsible for the decrease in band gap Eg, accounting for much of the increase (decrease) in electrical conductivity (Seebeck coefficient). This effect, combined with a reduction in lattice thermal conductivity, results in a big improvement in thermoelectric property over α-In2Se3. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Source


Xue C.X.,North University of China | Xue C.X.,University of Akron | Pan E.,University of Akron | Zhang S.Y.,Taiyuan University of Technology | And 2 more authors.
Mechanics Research Communications | Year: 2011

Based on the von Karman plate theory of large deflection, we derive the nonlinear partial differential equation for a rectangular magnetoelectroelastic thin plate under the action of a transverse static mechanical load. By employing the Bubnov-Galerkin method, the nonlinear partial differential equation is transformed to a third-order nonlinear algebraic equation for the maximum deflection where a coupling factor is introduced for determining the coupling effect on the deflection. Numerical results are carried out for the thin plate made of piezoelectric BaTiO 3 and piezomagnetic CoFe 2O 4 materials. Some interesting results are obtained which could be useful to future analysis and design of multiphase composite plates. © 2011 Elsevier Ltd. All rights reserved. Source


This paper reports a new development based on the manifold learning and intelligent classifier for the nonlinear feature extraction and fault pattern recognition of mine hoists. The wavelet packet was firstly used to extract the statistic characteristics of the hoist vibrations to obtain the original feature space. Then the locally linear embedding (LLE) was employed to learn the underlying nonlinear manifold in the original feature space to select distinct features. Following, the support vector machine (SVM) was applied to the fault pattern recognition. The energy-entropy based genetic algorithm was used to optimize the SVM parameters. The experimental vibration data measured on a mine hoist test rig was used to evaluate the proposed method. The diagnosis results show that the proposed method is efficient for the mine hoist and can increase the detection rate by 2.5% or better when compared with existing diagnosis approaches. Source


Li G.,Taiyuan University of Technology | Li G.,Buskerud and Vestfold University College | Chen X.,Buskerud and Vestfold University College
Applied Physics A: Materials Science and Processing | Year: 2012

Charge injection behaviours in silicon nitride of an Al/Si 3N4/n-Si metal-insulator-semiconductor (MIS) device are systematically studied before and after applying different high constant DC bias conditions with the aim of controlling charge accumulation in the dielectric when a high actuation voltage is applied.We found that both polarity and magnitude of charge accumulation in silicon nitride depend on the biasing direction. Charge injection from the semiconductor to the silicon nitride always dominates over charge injection from the Al electrode to the silicon nitride. Negative charge accumulation happens in silicon nitride when the Al electrode is positively biased, and positive charge accumulation occurs in silicon nitride when the Al electrode is negatively biased. The positive charge accumulation is much bigger than the negative charge accumulation under the same magnitude of stress voltage. Furthermore, the experimental results also show that the charge injection level exponentially increases with the applied voltage across the silicon nitride. These observed experimental results can be well explained by a modified Fowler-Nordheim tunnelling charge injection model, which takes into account the roles of both electrons and holes in the process of charge injection. © Springer-Verlag Berlin Heidelberg 2012. Source


Liu J.-J.,Taiyuan University of Technology | Wang J.-M.,Beijing Institute of Technology
International Journal of Robust and Nonlinear Control | Year: 2016

In this paper, we are concerned with a cascade of ODE-wave systems with the control actuator-matched disturbance at the boundary of the wave equation. We use the sliding mode control (SMC) technique and the active disturbance rejection control method to overcome the disturbance, respectively. By the SMC approach, the disturbance is supposed to be bounded only. The existence and uniqueness of solution for the closed-loop via SMC are proved, and the monotonicity of the 'reaching condition' is presented without the differentiation of the sliding mode function, for which it may not always exist for the weak solution of the closed-loop system. Considering that the SMC usually requires the large control gain and may exhibit chattering behavior, we then develop an active disturbance rejection control to attenuate the disturbance. The disturbance is canceled in the feedback loop. The closed-loop systems with constant high gain and time-varying high gain are shown respectively to be practically stable and asymptotically stable. Then we continue to consider output feedback stabilization for this coupled ODE-wave system, and we design a variable structure unknown input-type state observer that is shown to be exponentially convergent. The disturbance is estimated through the extended state observer and then canceled in the feedback loop by its approximated value. These enable us to design an observer-based output feedback stabilizing control to this uncertain coupled system. © 2016 John Wiley & Sons, Ltd. Source


Su P.,Taiyuan University of Technology | Liao H.,State Key Laboratory of Hydraulics and Mountain River Engineering
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2012

Shape parameters of bottom aerator adopted by an actual project are analyzed for its cavity properties with numerical simulation based on an orthogonal design method. The weight coefficients of all influencing factors, near-wall cavity length and middle cavity length, etc., are calculated by range and variance analysis. The results provide a theoretical foundation and a reference for shape design of aerator. Source


yan L.h.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

The conference center of the original structure of the frame structure, the ground floors.Now transform the functional requirements to construction, pumping column to the top of the structure to form a large space,Causing the vertical elements intermittent floors stiffness mutation irregular structure system.The basis for reinforced superstructure using SATWE conducted a multi-case earthquake under Elastic Compute using SAP elastoplastic analysis for validation.The analysis results show that the irregular structure, when reasonable structural arrangement, to take appropriate structural measures, the seismic performance to meet the regulatory requirements. © (2013) Trans Tech Publications, Switzerland. Source


Shen J.,Swinburne University of Technology | Lu G.,Nanyang Technological University | Zhao L.,Taiyuan University of Technology | Zhang Q.,Beijing Institute of Technology
Engineering Structures | Year: 2013

The response of sandwich tubes under internal explosive loading was investigated experimentally, numerically and analytically in this paper. Experiments were conducted first to capture the fundamental deformation and failure patterns and they served as a basis of validation for both the FE and analytical models. Further detailed deformation and blast loading history were revealed by the FE model. An explicit analytical solution for the deformation of sandwich tubes under blast loading has been worked out and used to obtain the optimum sandwich configurations, which would outperform their corresponding monolithic tubes. © 2011 Elsevier Ltd. Source


Du Z.,Taiyuan University of Technology | Lv Z.,Ningbo Yinzhou Supervision Station of Construction Engineering Quality
International Review on Computers and Software | Year: 2012

In this paper, the practical application of the 1-wire digital temperature sensors has been developed. By combining the practical engineering conditions, the temperature field of the vertically-buried single u-tube heat exchanger of the ground source heat pump is tested by the 1-wire digital sensors in a wide area. An experimental platform, based on digital sensors and controller-area network, is established, and an acquisition system is developed to record the data automatically. An intelligent monitoring system is also constructed. These would enable the 1-wire bus technology to support long-cable temperature monitoring and meet the requirement for the measurement of deep-layer soil temperature of many wells. Test for the operation of the single U-tube has been performed for 1 year, and the change of the soil temperature around the single U-tube at different directions, distance and depths have been measured. The measured values well reflect the variation of the soil temperature field, and the errors are acceptable. This intelligent temperature- measuring system makes the large-scale research on the temperature field of the underground heat exchanger run for a long term possible. © 2012 Praise Worthy Prize S.r.l. - All rights reserved. Source


Du Z.Y.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

In this paper, the mathematical physical model of the heat and moisture transfer, which is about a vertical single-U-tube heat exchanger of a ground source heat pump (GSHP), is used to simulate the soil temperature fields inside drilling around a vertical single-U-tube ground source heat exchanger. The soil temperature fields inside drilling in the GSHP project running for one year are computed numerically. It shows that soil structure, cooling and heating load, cooling and heating period, and convalescence period have been determined by practical engineering conditions, the distance in the plane between drillings have a huge influence on heat transfer effect, only when the distance is designed reasonably, can it be possible to make sure normal heat transfer efficiency. Source


Wen Z.P.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

The bridge simplified two-dimensional plane beam element model, Simplified to two degrees of freedom quarter vehicle model, The entire bridge system is divided into two subsystems vehicle and bridge, Using separate equations of motion of vehicles and bridges, Proposed bridge systems numerical solution of coupled vibration analysis, The law at the wheel in contact with the deck displacement compatibility conditions for a balanced relationship with the interaction force associated, At each time step using the Newmark-β integration scheme, Through this paper the numerical solution results do comparison with the literature, the results show that the proposed method is reliability and validity. © (2014) Trans Tech Publications, Switzerland. Source


Li C.,Yangtze Normal University | Dang S.,Yangtze Normal University | Han P.,Taiyuan University of Technology
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

Geometrical structure of CdS with vacancy was optimized by using density functional theory (DFT) based on first-principle ultrasoft pseudopotential method. Optimized results showed that the vacancy resulted in local lattice distortion and the relaxation of neighboring atoms. Then vacancy effects on electronic structure (energy-band structure and electron-state density) of CdS were analyzed. The results revealed that S vacancy made the band gap narrower and Cd vacancy made it wider, but CdS with S and Cd vacancy were direct band gap semiconductor. The optical properties of CdS with vacancies were investigated. The results indicated that changes on optical properties mainly focused on low-energy region because of the change of electronic structure of atom neighbor vacancy. Source


Zhang Z.,Taiyuan University of Technology | Qu Y.,Beijing University of Chemical Technology | Wang S.,Beijing University of Chemical Technology | Wang J.,Beijing University of Chemical Technology
Journal of Molecular Catalysis A: Chemical | Year: 2010

The conversion of methyl lactate (ML) over sodium tripolyphosphate, a model catalyst derived from silica supported sodium polyphosphate, was studied systematically by quantum mechanical calculations using MP2 and B3LYP methods. The reaction profiles of ML and its reaction products, acrylic acid (AA), methyl acrylate (MA) and lactic acid (LA) via various reactions such as dehydration, decomposition, decarbonylation, hydrolysis and esterification has been determined with the catalyst. For each reaction, the intermediate and transition state as well as their energetics were calculated. Over the catalyst, the main consumption routes for ML were identified to be the direct decomposition to AA and methanol and decarbonylation to acetaldehyde (AD), methanol and carbon monoxide. Both of the above reactions start from the same reaction intermediate. The main route for the formation of MA was supposed to be via esterification of AA with methanol. The values of activation barriers also indicate that over the sodium polyphosphate catalyst conversion of ML to AA has a higher selectivity than that from LA to AA. © 2010 Elsevier B.V. All rights reserved. Source


In this work, colloidal hexagonal-phase -NaYF4:Nd3+/ Yb3+/Ho3+/NaYF4:Nd3+/Yb3+ core/shell nanoparticles with intense visible upconversion emissions under 808-nm laser excitation were prepared. Compared with the core-only nanoparticles, a maximum 990-fold overall enhancement in the emission intensity of Ho3+ ions was achieved with the help of active-shell coating design, due to the significant increase in the near-infrared absorption and efficient energy transfer from Nd3+ primary-sensitizers to Ho3- activators via Yb3+ bridging sensitizers. The luminescence-enhancement effect exhibited a strong dependence on the doping concentrations of NaYF4:Nd3+/Yb3+ active-shell. The optimal concentrations of Nd3+ and Yb3+ ions in the active-shell layer were found to be 30 and 5 mol. %, respectively.Moreover, the upconversion emission intensity of NaYF4:Nd3+/Yb3+- coated nanoparticles was about 2.5 times higher than the one coated with a NaYF4:Nd3+ active-shell. © 2015 Optical Society of America. Source


Tian Y.,Taiyuan University of Technology
Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics | Year: 2013

In complex equipment system, the knowledge of fault diagnosis could hardly be precise and complete. Inspired by the biological humoral immunity, an immune learning model for fault diagnosis is proposed. The detectors are defined as B-lymphocyte and antibody structures in the B-lymphocyte. The patterns of antigen are generalized by using double learning mechanisms of B-lymphocyte and antibody. The mechanism not only solves the problems that how to recognize the faults caused by the overlap of the omens, but also continuously supplements and improves the diagnostic knowledge. The system can detect and learn known and unknown fault types, and achieve optimal diagnostic results. Experiments were undertaken with induce motor to demonstrate the efficiency and accuracy of the fault detection. Source


Li H.-Y.,University of Shanghai for Science and Technology | Li X.,University of Shanghai for Science and Technology | Song J.-C.,Taiyuan University of Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

To fully access online safety condition of mining high voltage (HV) cable and ensure the safety operation of the mine, a new notion of safety early warning system for mining HV cable was developed. Based on the research about cable aging, a set of index characterizing the insulation parameters was proposed and the weight of each index was determined with analytic hierarchy process (AHP). To compare each index from persperitive of time and space, "perfection degree" was introduced to deal with the data in the same measuring scale. Then an improved radar chart method with eigenvalue calculating algorithm was applied to the safety early warning system, in the process of which the reference samples characterizing the impairment of cable and equilibrium factor reflecting the multisource information fusion are adopted, and the result is concise, clear and intuitive. Finally, the system is tested by monitoring the 10 kV mining HV cable, the state of the cable is effectively represented by multi-dimensional data and picture, and with more superiority than other method. Source


Chen Z.,CAS Shanghai Institute of Ceramics | Gao Y.,CAS Shanghai Institute of Ceramics | Gao Y.,Shanghai University | Kang L.,Taiyuan University of Technology | And 4 more authors.
Journal of Materials Chemistry A | Year: 2014

A simulation of the optical properties of nanocomposite coatings derived from VO2 nanoparticles (NPs) shows that the nanocomposite coatings have advantages over pure VO2 thin films in their solar energy modification ability (ΔTsol) and luminous transmittance (T lum). These nanocoatings rely on fine quality VO2 NPs; methods to prepare NPs for this purpose are yet to be developed. By studying the formation mechanism of VO2 NPs, the NP preparation process was optimized, and fine crystal quality VO2 NPs with diameters from 25-45 nm were synthesized. The highest latent heat of these VO2 NPs is 43 J g-1, which is considerably higher than the 25 J g-1 reported previously and close to the 51 J g-1 of bulk VO2, which indicates that these VO2 NPs are highly crystalline. These NPs showed an asymmetrical phase transition and increased insulator-metal transition (IMT) temperatures. According to our results, the size of particles is not the only reason that should be responsible for the increased IMT temperatures. The high-quality NPs were dispersed in polyurethane (PU) and coated on polyethylene terephthalate (PET). The relationship between the solar energy modification ability (ΔTsol) and the luminous transmittance (Tlum) was studied by experiments and simulation. Although the best experimental values of ΔTsol = 22.3% and Tlum = 45.6% are still lower than the simulation results of ΔTsol = 23.7% and Tlum = 32.4%, these values represent the best for reported VO2 smart films or coatings. © 2014 The Royal Society of Chemistry. Source


Wang G.,Weifang Medical University | Chen W.,Taiyuan University of Technology
Experimental Biology and Medicine | Year: 2012

To understand the effect of mechanical stimulation on posterior scleral reinforcement (PSR), rabbit scleral fibroblasts after PSR were subjected to stretch in vitro, and the viscoelastic behavior of scleral fibroblasts was evaluated. Three-week-old rabbits were monocularly treated by eyelid suturation randomly to prepare the experimental myopia eyes. After 60 days, the experimental myopia eyes were treated by PSR. After six months, the posterior pole scleral fibroblasts (normal sclera - group A, sclera after operation - group B and fusion region of sclera and reinforcing band - group C) were isolated and cultured in vitro. The cells were subjected to cyclic stretch regimens (sine wave, 3% and 6% elongation amplitude, 0.1 Hz, 48-h duration) by an FX-4000 Tension System. The micropipette aspiration technique was used to investigate the viscoelasticity of scleral fibroblasts. The cellular viscoelasticity (E0, E∞ and μ) of group C was significantly lower than groups A and B (P < 0.05), and there was no significant difference between groups A and B (P > 0.05). The results show that the viscoelasticity in different regions of sclera after PSR is different. Following a 48-h stretch, the cellular viscoelastic parameters were significantly decreased when compared with the respective static groups (P < 0.05) in groups A and B. For group C, the viscoelasticity of the stretch group was significantly higher than the static control group (P < 0.05). There was no difference between the 3% and 6% stretch groups in each group (P > 0.05). The changes of viscoelasticity suggest that different regions of sclera have different responses to mechanical stimulation in the process of treating high myopia by PSR and that mechanical stimulation plays an important role in the treatment of axial myopia by regulating the viscoelasticity of scleral fibroblasts. © 2012 by the Society for Experimental Biology and Medicine. Source


Chen X.-B.,Beijing University of Posts and Telecommunications | Xu G.,Taiyuan University of Technology | Yang Y.-X.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications
Optics Communications | Year: 2010

Through designing a quantum communication network, we propose a protocol for the teleportation between multiple senders and multiple receivers via only one controller. In order to rationally employ the quantum entanglement resources, the controller shares the entangled state with every sender, while there is no directly shared entanglement link between sender and receiver. The security is analyzed in detail. Moreover, this protocol reduces the classical communication cost in the public channel by means of the coding. © 2010 Elsevier B.V. All rights reserved. Source


Hou J.,Taiyuan University of Technology | Qi X.,Shanxi University
Science China: Physics, Mechanics and Astronomy | Year: 2012

We discuss the fidelity of states in the infinite-dimensional systems and give an elementary proof of the infinite-dimensional version of Uhlmann's theorem. This theorem is used to generalize several properties of the fidelity of the finite-dimensional case to the infinite-dimensional case. These are somewhat different from those for the finite-dimensional case. © Science China Press and Springer-Verlag Berlin Heidelberg 2012. Source


Zhang Y.,University of Science and Technology Beijing | Lu Z.P.,University of Science and Technology Beijing | Ma S.G.,Taiyuan University of Technology | Liaw P.K.,University of Tennessee at Knoxville | And 4 more authors.
MRS Communications | Year: 2014

With multiple elements mixed at equal or near-equal molar ratios, the emerging, high-entropy alloys (HEAs), also named multi-principal elements alloys (MEAs), have posed tremendous challenges to materials scientists and physicists, e.g., how to predict high-entropy phase formation and design alloys. In this paper, we propose some guidelines in predicting phase formation, using thermodynamic and topological parameters of the constituent elements. This guideline together with the existing ones will pave the way toward the composition design of MEAs and HEAs, as well as property optimization based on the composition-structure-property relationship. © 2014 Materials Research Society. Source


Wang L.,Taiyuan University of Technology
Expert Systems with Applications | Year: 2011

According to the peer-to-peer (P2P) sociality, an expert-driven multi-semantic self-organized P2P semantic community model is built in this paper to resolve the two principle problems of P2P resource management, which are how to possess enormous number of high quality shared resource, how to find the resource quickly and accurately. The main contribution of this paper is: Circled digit one the autonomous peer (AP) model and Autonomic Semantic Community (ASC)model are build, Circled digit two one local domain-related trust and trusted evaluation is projected that bases on semantic similarity, history evaluation and time effect and it takes the requirement and owned resource two aspects into account to present one AP. Circled digit three an algorithm of fusing APs'local trust degree and self-evaluation is designed.Enclosed digit four a procedure to collaboratively elect expert APe is proposed. Circled Digit Five Self-organized community formation algorithm SoFA and its communication mechanism are built. In SoFA, APs gather its communication information and according to it to evaluate itself and other APs locally, build and dynamically adjust local topology, elect the domain expert APe and then an expert-driven ASC is established. Experiment shows our domain trust evaluation and self-evaluation mechanism and SoFA could not only adaptively optimize network to improve the efficiency of service (resource) discovery but also base on the synthesized trust degree to find the free-riders, malice peers, low quality service peers and to keep them within limits. © 2010 Elsevier Ltd. All rights reserved. Source


Xue H.-B.,Taiyuan University of Technology
Annals of Physics | Year: 2013

We study theoretically the full counting statistics of electron transport through side-coupled double quantum dot (QD) based on an efficient particle-number-resolved master equation. It is demonstrated that the high-order cumulants of transport current are more sensitive to the quantum coherence than the average current, which can be used to probe the quantum coherence of the considered double QD system. Especially, quantum coherence plays a crucial role in determining whether the super-Poissonian noise occurs in the weak inter-dot hopping coupling regime depending on the corresponding QD-lead coupling, and the corresponding values of super-Poissonian noise can be relatively enhanced when considering the spins of conduction electrons. Moreover, this super-Poissonian noise bias range depends on the singly-occupied eigenstates of the system, which thus suggests a tunable super-Poissonian noise device. The occurrence-mechanism of super-Poissonian noise can be understood in terms of the interplay of quantum coherence and effective competition between fast-and-slow transport channels. © 2013 Elsevier Inc. Source


Liu G.,Taiyuan University of Technology | Wang Y.,Nankai University | Jiao L.,Nankai University | Yuan H.,Nankai University
ACS Applied Materials and Interfaces | Year: 2014

The catalytic effects of few-layer, highly wrinkled graphene nanosheet (GNS) addition on the dehydrogenation/rehydrogenation performance of MgH 2 were investigated. It was found that MgH2-5 wt %GNSs nanocomposites prepared by ball milling exhibit relatively lower sorption temperature, faster sorption kinetics, and more stable cycling performance than that of pure-milled MgH2. The dehydrogenation step confirms that the Avrami exponent n increases from 1.22 to 2.20 by the Johnson-Mehl-Avrami (JMA) formalism when the desorption temperature is reduced from 350 °C to 320 °C and 300 °C, implying that a change in the decomposition temperature can alter the mechanism during the dehydrogenation process. For rehydrogenation, the Avrami value n is close to 1; further study by several models coincident with n = 1 reveals that the absorption process of the MgH2-5 wt %GNSs sample conforms to the Mampel equation formulated through the random nucleation approach and that the nature of the absorption mechanism does not change within the temperature range studied. Furthermore, microstructure analysis demonstrated that the defective GNSs are distributed uniformly among the MgH2 particles and that the grain size of the MgH2-5 wt %GNSs nanocomposite is approximately 5-9 nm. The efficient metal-free catalytic dehydrogenation/rehydrogenation of MgH2 can be attributed to the coupling of the nanosize effect and defective GNSs. © 2014 American Chemical Society. Source


Zhang Y.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

With the rapid economic development of our country and the improvement of housing function requirement and the lack of land for construction, adding layer structure has become a trend in the development of construction industry. Now a lot of adding layer buildings have sprung up both at home and abroad. Adding layer structure needs to undertake seismic calculation to ensure the reliability under the earthquake effect. At present, many researchers' studies of the adding layer structure only stay in elastic stage, and there are only very little researches about the static and dynamic elastic-plastic of the structure. Based on the literature and art center of Changzhi city as the background, it is introduced the calculation process, which adopted the EPDA& PUSH software for the static and dynamic elastic-plastic analysis of reinforced concrete structure, obtained the carrying capacity and the deformation under the rare earthquake, and analyzed the results. By comparison, the results of the static and dynamic elastic-plastic analysis are similar. © (2014) Trans Tech Publications, Switzerland. Source


Lili L.,Taiyuan University of Technology
Communications in Computer and Information Science | Year: 2012

In recent years, labor productivity increase a lot and production cost is decreasing with the modern production development and popularity of computer information technology. However, the cost of logistic plays more and more important place in the whole cost. Therefore, as the third profit source after the first profit source of cost decreasing in enterprises and the second profit source of efficiency improvement, modern logistic development is focusing by various walks of life in the whole society. Electronic commerce logistics bring the huge revolution into the logistic field. More and more enterprises become positive on the electronic commerce and use the electronic commerce mode. Although the logistics of electronic commerce is paid much attention, the limitation of perception, system and technology lead our electronic commerce logistics is still in the slow development that has huge distance with the social requirement. © 2012 Springer-Verlag Berlin Heidelberg. Source


Zhang Z.-Q.,Institute of High Performance Computing of Singapore | Zhang Z.-Q.,National University of Singapore | Liu G.R.,University of Cincinnati | Liu G.R.,Taiyuan University of Technology
Engineering Analysis with Boundary Elements | Year: 2014

Node-based and edge-based smoothed FEM (NS-FEM and ES-FEM), and α-FEM are extended to solve nonlinear problems. The nonlinear strain field is smoothed using the gradient smoothing. The continuous scalar scaling factor α enables the α-FEM continuously transforming from overestimated model to underestimated model. Numerical examples reveal that ES-FEM is a robust and stable method with high accuracy and computational efficiency for nonlinear problems. The exact solution in strain energy of force driven problems can be bounded by NS-FEM and FEM. The α-FEM can also be "tuned" to find nearly exact solution to nonlinear mechanics problems of solids of complicated geometry. © 2014 Elsevier Ltd. All rights reserved. Source


Wang P.P.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

In this paper, based on the theories of truss structure with the characteristics of the aqueduct structure, puts forward a new type of aqueduct structure system, the cable pretensioned truss structure under the use of state for the key point's response spectrum analysis and elastic time history response analysis. The stresses induced by the analysis of structure of key parts are meeting the requirements of the current specifications, in the flexible working state. Pretensioned steel in this paper, the research aims to the whole assembly of the aqueduct structure characteristics and the theoretical analysis of the dynamic characteristics of this kind of structure design for the future research and provide some reference, so as to promote the new application and development in the form of aqueduct. © (2014) Trans Tech Publications, Switzerland. Source


Wang J.M.,Taiyuan University of Technology
Survey Review | Year: 2015

It is important that the author detects gross errors when using coincidence points for coordinate transformation. Gross errors in the coincidence points are sometimes unavoidable and affect the accuracy of the estimated transformation parameters. The author proposes a method that is different from the commonly used robust estimation and least squares with hypothesis testing methods. The author calls our technique for locating gross errors the ‘full search’ algorithm. A location matrix is formed when the full search is complete. The author has also developed a strict estimation equation for multiple gross errors, which estimates the errors and the optimal transformation parameters. The author used coordinate transformation experiments to compare the residuals and transformation parameters of three schemes. Our results indicate that the proposed method can give satisfactory results when transforming coordinates. © 2015 Survey Review Ltd. Source


Zhu Z.,CAS Institute of Chemistry | Qilu,CAS Institute of Chemistry | Zhang D.,Taiyuan University of Technology | Yu H.,CAS Institute of Chemistry
Electrochimica Acta | Year: 2014

A novel composite co-precipitation method is developed to prepare high performance LiNi0.5Mn1.5O4. Combined with a facile hydrothermal treatment, a precise stoichiometric LiNi 0.5Mn1.5O4 is obtained. The product has classic Fd3m structure, and meanwhile the content of Mn3+ is strictly limited. Additionally, the as-prepared LiNi0.5Mn1.5O 4 has a spherical hierarchical morphology, composed of nano or submicron primary particles. Compared to traditional methods, the obtained LiNi0.5Mn1.5O4 shows superlative electrochemical performances. It delivers a high capacity of 144.9 mAh g -1 and a high initial columbic efficiency of 98.1%, importantly 98.2% of the capacity discharges at 4.7 V plateau. After 200 cycles under 0.3 C, 1 C and 3 C, the material retains 96.3%, 94.4% and 91.1% of the original capacities, respectively. Chemical and electrochemical measurements indicate that it is the elimination of Mn3+ in the spinel that leads to the high capacity of LiNi0.5Mn1.5O4 discharging at 4.7 V high voltage. The spherical hierarchical morphology as well as the retained Fd3m structure effectively favors the rates performance. In addition, this hierarchical morphology also plays a significant role in improving the tap density of the cathode material. © 2013 Elsevier Ltd. All rights reserved. Source


Tian Y.,Taiyuan University of Technology
Journal of Information and Computational Science | Year: 2013

Based on the theory of fuzzy mathematics and the features of analog circuits fault diagnosis, the fuzzy immune algorithm for fault diagnosis is proposed, which overcomes the shortcomings of low quality of detectors in immune algorithms. The novel algorithm uses the particle filter to guide the mutation of antibodies and combines artificial immune with particle filter algorithm to optimize the learning process of the immune algorithm. Finally, it can increase the diversity of the mature detector populations. The feasibility and validity of the algorithm are validated by simulation of fault diagnosis on analog circuit. 1548-7741/Copyright © 2013 Binary Information Press. Source


Hao Q.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

We studyed on the "the binding capacity of EPS and Fe3+","the promoting effect experiment of EPS-Fe3+ to the leaching of Cr, Pb"and the "distribution characteristics of heavy metals in EPS,inside and outside cells".Proved that large molecular EPS (MT) and Fe3+ tend to form a stable complex EPS ((MT)-Fe3+. Unit mass of macromolecular EPS binding ability to Fe3+ is 10.7mg/mgEPS.And with the addition of EPS ((MT)-Fe3+ complex, Cr, Pb in sludge by bioleaching removal rate increased by 1.48, 1.25 times.The distribution characteristics of heavy metal ions in the cell into three types: type EPS, intracellular type, balance type. © (2014) Trans Tech Publications, Switzerland. Source


Dong L.,Taiyuan University of Technology | Takeuchi Y.,Aoyama Gakuin University
Nonlinear Analysis: Real World Applications | Year: 2013

In this work, we consider the control problem of multiple Lotka-Volterra system. Our means to control the population dynamics is via impulses not only in a single species, but also in multiple species, that is, some members of these populations are added to or removed from the environment impulsively at the same time. We establish the strategies for preventing all the species from going extinct by stabilizing some special positive points, which may not be the equilibrium points of the system. We give several Lotka-Volterra systems to illustrate our results by drawing their time-series graphs. © 2012 Elsevier Ltd. All rights reserved. Source


Wang X.,Yanshan University | Li Q.,Yanshan University | Di Y.,Taiyuan University of Technology | Xing G.,Yanshan University
Fibers and Polymers | Year: 2012

The object of this work is to develop a flame-retardant viscose fiber containing phosphazene derivative. Hexaphenoxycyclotriphosphazene (HPTP) was synthesized and applied to viscose fiber through wet spinning method, with alkyl polysaccharide glycoside as dispersant. Properties of the fiber were tested and discussed. All flame-retardant samples survived 3 ignitions, according to 45 degree slope burning method. Limiting oxygen index value of the flame-retardant fiber containing 16% flame retardant was 28.6 %. The number decreased to 27.5 % after 30 washing cycles. After burning, inflated carbonized coat was found on the fiber surface in scanning electron microscopy image. Thermal gravimetric analysis and differential scanning calorimetry results indicated that the primary decomposition of fiber was moved up by about 20°C, while secondary decomposition was delayed by around 46°C. Damage on mechanical properties of fibers was insignificant. The introduction of HPTP was compatible and the flame retardancy of viscose fiber was greatly improved with limited negative impact. © 2012 The Korean Fiber Society and Springer Netherlands. Source


Liu X.H.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2014

The construction of ecological residence is based on purpose of do not destroy the ecological balance, achieving energy conservation and environmental protection requirements. Therefore, promoting the ecological residence, is of great significance for the protection of natural resources and environment. This article mainly from the perspective of ecological residential design, combined with small towns in the north, to do the simple discussion from green ecological residential housing overall layout to the maintenance of the structure of the design details, from the choice of building materials and recycled to the use of renewable energy. © (2014) Trans Tech Publications, Switzerland. Source


Zhang Y.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2014

In recent years, ultra-urban road overpass vehicle impact beam incident after another. High beam impact of vehicles on the overpass bridge safety impact has become another important issue. High trucks at home and abroad on the curve of reinforced concrete beam bridge working effect of the impact is still insufficient. Based on high-precision linear dynamic finite element simulation analysis, research under the action of high vehicle collision, reinforced concrete curved girder Bridges of local damage effect and the overall distortion performance. The results showed that: high vehicles on the bridge superstructure imposed impact impulse and punching power led bridge superstructure is hitting zone produce local cracks. Damage caused by different impact velocity varied. © (2014) Trans Tech Publications, Switzerland. Source


Zhang G.,Taiyuan University of Technology
2013 25th Chinese Control and Decision Conference, CCDC 2013 | Year: 2013

A technical scheme for automatic water level measurement, data processing and control of the water tank was proposed in this paper. This scheme was based on the study of the water level detection technique and the features of water replenishment tank of central air conditioning, such as chemical softness, corrosive, slightly turbidity and etc. The new schema has a good performance in practical application. © 2013 IEEE. Source


Chen X.-B.,Beijing University of Posts and Telecommunications | Xu G.,Taiyuan University of Technology | Niu X.-X.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Yang Y.-X.,Beijing University of Posts and Telecommunications
Optics Communications | Year: 2010

The central theme of this paper is that we propose an efficient protocol for comparing the equal information with the help of a third party (TP). We assume that TP is semi-honest, i.e., TP executes the protocol loyally, keeps a record of all its intermediate computations and might try to steal the players' private inputs from the record, but he cannot be corrupted by the adversary. The security of this protocol with respect to various kinds of attacks is discussed. Our protocol utilizes the triplet entangled states and the simple single-particle measurement. The particles carried the secret messages do not be repeatedly transmitted. The players' messages are divided into many groups. Sometimes, the protocol is already successfully completed, but all data are not compared. Thus, many time and huge quantum resources can be saved. © 2009 Elsevier B.V. All rights reserved. Source


Yi-Bing Z.,Taiyuan University of Technology
Lecture Notes in Electrical Engineering | Year: 2012

Through a combination of detection technology and GPRS communication technology, rainfall stations and watershed hydrological stations in each observation point will be used as the system terminal. Those data collection terminals are composed of sensor unit and microcontroller system, mainly in charge of on-site water level, flow, and rainfall and other signal acquisition, software filtering, processing, storage and display. Real-time data collected will be stored, or transmitted through the RS232 and GPRS network to the data terminals, after post-processing by the central computer, provided to upper management. This system has been achieved a long-range, wide range of data transmission, and provided a scientific way for flood control decision. © 2012 Springer-Verlag. Source


Zhang Y.-B.,Taiyuan University of Technology
Lecture Notes in Electrical Engineering | Year: 2012

Aimed at the current status and existing problems of safety monitoring of domestic coal mines, a computer-controlled coal mine safety monitoring system is proposed. The integrated system is composed of three subsystems: monitoring, communication and control subsystems. Monitoring subsystem is composed of gas, wind speed, negative pressure, temperature etc sensors, which are distributed in the mine and used to carry out real-time monitoring. The communication subsystem consists of Coordinators, Routers and End node and performs wireless communication. These two subsystems establish contact with the central control computer located on the surface by the CAN buses. The system can simultaneously transmit real-time data to the host computer in the management center and the mobile-phones of the responsible personnel by GPRS module, and when the data exceed the limited values, an alarm will occur. Compared with data transmission through conventional bus, application of wireless sensor network and GPRS network technologies reduces investment on underground lines-laying and maintenance difficulties, ensures timely, accurate and rapid transmission of data in all key underground mining zones and improves efficiency of the system. The system has such dominants as easy-building up, powerful-function, high-reliability, good-extendibility and etc. The system is an advanced approach to solve the present key problem that wireless communication distance is limited in the mine and has great benefits for coal mine safety production. © Springer-Verlag 2012. Source


Teng K.,Taiyuan University of Technology
Nonlinear Analysis: Real World Applications | Year: 2013

In this paper, we establish the existence of two nontrivial solutions to a class of nonlocal hemivariational inequalities depending on two parameters. Our methods are based on critical point theory for non-differentiable functionals. © 2012 Published by Elsevier Ltd. Source


Guo H.-G.,Taiyuan University of Science and Technology | Xie K.-M.,Taiyuan University of Technology
Tiedao Xuebao/Journal of the China Railway Society | Year: 2014

The Hammerstein model of EMU braking system was ectablished in view of nonlinearity and importance of the braking system in ATO (automatic train operation). It was a kinetic model and accorded with the control law. The working process of the EMU braking system was introduced according to the transport mechanism of braking instructions. The static nonlinear function obtained by curve fitting was used to depict the braking characteristics table and the delay system was used to describe the delay characteristics of the braking instruction transmission and the braking controller operation. One first-order linear system represented the feedback process of breaking. The other first-order linear system described the remission process of EMU acceleration impulses. The above three links of braking constituted the Hammerstein model. Then, the way how to identify model parameters with the mind evolutionary algorithm (MEA) was introduced. Finally, simulation by EMU CRH2 proved the effectiveness of the proposed model and parameter identification algorithm. Source


Zhao B.,Taiyuan University of Technology
Natural Hazards | Year: 2016

This paper presents facts related to the explosion accident that occurred on August 12, 2015, in Tianjin Port, China. Two serious explosions occurred continuously. Six large fire points and dozens of small ones occurred, and they resulted in heavy casualties and property losses. This paper discusses the catastrophe, causes, and related emergency response. © 2016 Springer Science+Business Media Dordrecht Source


Wang Y.,Taiyuan University of Science and Technology | Hou J.,Taiyuan University of Technology
Quantum Information Processing | Year: 2015

The detection of entanglement for quantum states in multipartite systems is very significant. In this paper, we firstly give a necessary and sufficient condition for k-separability(2≤k≤m) of m-partite pure states. Furthermore, we derive some equivalent conditions for k-separability of pure states in any multipartite quantum systems of finite or infinite dimension. Lastly, we give some examples to explain the application of our results. © 2015, Springer Science+Business Media New York. Source


Guo M.L.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

Expansive soil mixed with a certain amount of lime in the post-isostatic pressing, as measured through the oedometer specimen expansion and contraction coefficient changes. Test divided load and no-load charge plus two groups, drawn economically reasonable dosage of lime for building design and construction to provide evidence. © (2014) Trans Tech Publications, Switzerland. Source


Pan P.J.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

The energy dissipation design method has received more attention by engineering circle. Nowadays, the buckling restrained braces (BRBs) are used in higher structures being dissipation energy components. So, it is very necessary to determine the damage quantity of BRBs under earthquake. Firstly, the meaning of the damage quantity of BRBs is clarified based on the energy theory. Secondly, a single degree of freedom analyses model which is suitable to the frame structure is proposed. The nonlinear dynamic time-history analysis of BRBs system is carried out by using FEMS software of ANSYS 11.0 and seismic response of BRBs is obtained. Finally, a practical calculation model of the Damage quantity of BRBs is established. Using MATLAB software, the Damage quantity of BRBs is obtained. © (2014) Trans Tech Publications, Switzerland. Source


Li H.,University of Shanghai for Science and Technology | Liu Z.,University of Shanghai for Science and Technology | Song J.,Taiyuan University of Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

Aim to the integration of cyber physical systems (CPS), a relevance vector machine (RVM) based data-driven method was proposed for real-time static security situational awareness. RVM is a general Bayesian probabilistic framework to learn the kernel-based classification model, in which a set of hyperparameters are imposed to the hierarchical priors over model parameters for obtaining the sparse solutions, and the Bernoulli distribution is incorporated to output a consistent estimation of the posterior probability. The operation conditions were firstly generated according to the dispatches of the day-ahead markets and the pre-fault feature sets with contingency class memberships were obtained. Then a distance-based Relief algorithm was employed for feature rank and selection. Finally, RVM learning for classification was applied for security recognition. A case studied in the IEEE 30-bus system shows the proposed method can provide exceedingly sparse solutions, high accuracy and probabilistic outputs, further clarifying its superiority in security awareness. © 2015 Chin. Soc. for Elec. Eng. Source


Jianfang C.,Xinzhou Teachers University | Junjie C.,Taiyuan University of Technology | Qingshan Z.,Xinzhou Teachers University
Cybernetics and Information Technologies | Year: 2014

In order to solve the problems of security threats on workflow scheduling in cloud computing environments, the security of tasks and virtual machine resources are quantified using a cloud model, and the users' satisfaction degree with the security of tasks assigned to the virtual resources is measured through the similarity of the security cloud. On this basis, combined with security, completion time and cost constraints, an optimized cloud workflow scheduling algorithm is proposed using a discrete particle swarm. The particle in the particle swarm indicates a different cloud workflow scheduling scheme. The particle changes its velocity and position using the evolution equation of the standard particle swarm algorithm, which ensures that it is a feasible solution through the feasible solution adjustment strategies. The simulation experiment results show that the algorithm has better comprehensive performance with respect to the security utility, completion time, cost and load balance compared to other similar algorithms. Source


Qi X.,Shanxi University | Hou J.,Taiyuan University of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

In this paper, we present a characterization of optimal entanglement witnesses in terms of positive maps and then provide a general method of checking optimality of entanglement witnesses. Applying it, we obtain indecomposable optimal witnesses that have no spanning property. These also provide examples that support a recent conjecture saying that the so-called structural physical approximations to optimal positive maps (optimal entanglement witnesses) give entanglement breaking maps (separable states). © 2012 American Physical Society. Source


Wei G.,Taiyuan University of Technology | Wei G.,Ningbo University of Technology | Liu H.,Taiyuan University of Technology | Shi C.,Ningbo University of Technology | And 3 more authors.
Journal of Physical Chemistry C | Year: 2011

In this work, we report the temperature-dependent field emission properties of 3C-SiC nanoneedles (SiCNNs) in the range of room temperature (RT) to 500 °C. SiCNNs are synthesized via catalyst-assisted pyrolysis of a polyaluminasilazane precursor. The obtained SiC nanostructures are needlelike shaped with numerous sharp corners around the tiny tips. Field emission characteristics show that turn-on field (Eto) of as-synthesized SiCNNs are ranged in 1.30 to 0.66 V/μm with the temperature raised from RT to 500 °C. At a fixed electric field of 1.37 V/μm, about a three-order-of-magnitude increase of the emission current level has been observed. We attribute the significant reduction of Eto and the remarkable increase of emission current to the decrease of work function induced by the raise of temperatures. © 2011 American Chemical Society. Source


Zhang Y.,University of Science and Technology Beijing | Ma S.G.,University of Science and Technology Beijing | Qiao J.W.,Taiyuan University of Technology
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2012

The AlCoCrFeNi high-entropy alloys (HEAs) were prepared by the copper mold casting and Bridgman solidification. X-ray diffraction (XRD) results verify that the main phase was bodycentered- cubic (bcc) solid solution by these two solidification processes, indicating its good phase stability. Interestingly, the metallographic photos show a morphology transition from dendrites to equiaxed grains after Bridgman solidification, which was considered to have a strong dependence on the parameter of the G/V (the temperature gradient to the growth rate ratio). Compared to the as-cast sample, the plasticity of alloys synthesized by Bridgman solidification was improved by a maximum of 35 pct. © The Minerals, Metals & Materials Society and ASM International 2011. Source


In this Letter, I present a versatile strategy to enhance the near-infrared to near-infrared (NIR-to-NIR) upconversion luminescence from sub-10-nm ultra-small LaF3:Yb3+/Tm3+ colloidal nanoparticles through lanthanide doping under 980 nm laser excitation. It is interesting that the NIR-to-NIR upconversion emission at 801 nm of LaF3:Yb3+/Tm3+ nanoparticles can be improved by increasing the Tm3+ doping concentration or by introducing another lanthanide activator (Er3+ or Ho3+) as a sensitizer. The luminescence enhancement effect showed a strong dependence on the doping concentrations of activator ions (Tm3+, Er3+, or Ho3+). Particularly, adding 1 mol. % Ho3+ ions into LaF3:Yb3+/Tm3+ nanoparticles induced a 2.85-fold enhancement in NIR 801 nm emission of Tm3+ ions. The related upconversion emission mechanisms were investigated and discussed. © 2015 Optical Society of America. Source


Li L.-J.,Taiyuan University of Technology
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2012

The spatial effects of ring beams in retaining structure with double-row piles for a deep foundation were investigated. The software of FLAC3D was employed to study the tip displacements and moments of the piles at different locations in retaining structure with double-row piles and ring beams. Numerical results show that the tip displacements of pile at the corner are much less than the ones in the middle. The maximum tip displacement is located at the piles in the middle. Compared with the on-site measured data, above result match the test data very well. It is also found that the retaining structure with row piles has better synergistic reaction with ring beams. The deformation and internal force are affected by ring beams. The displacement and moment could also be limited by ring beams. Therefore, it is proposed that the spatial effect should be considered in the design of retaining structure with double-row piles. Source


Shi L.,Shandong University | Shi L.,Taiyuan University of Technology | Wei Y.,Shandong University | Sun N.,Shandong University | Zheng L.,Shandong University
Chemical Communications | Year: 2013

It was found for the first time that rich lamellar structures are formed by a single-tailed amphiphilic ionic liquid (IL), 1-dodecyl-3-methylimidazolium β-naphthalene sulfonate ([C12mim][Nsa]), in aqueous solutions without any additives. With increasing IL concentration, spontaneous transition from micelles to unilamellar and multilamellar vesicles, planar bilayers, and then to lamellar liquid crystals occurs. © 2013 The Royal Society of Chemistry. Source


Zhou X.,Taiyuan University of Technology | Han Y.,CAS Research Center for Eco Environmental Sciences | Guo X.,CAS Research Center for Eco Environmental Sciences
Chemical Engineering Journal | Year: 2013

A pilot-scale modified Orbal oxidation ditch with internal recycle of the nitrified liquor was developed to significantly enhance total nitrogen (TN) removal through simultaneous nitrification/denitrification (SND) coupled with pre-denitrification under the aerated-anoxic condition. Long-term operational results showed that the highest TN removal efficiency was achieved at very low dissolved oxygen (DO) of 0.15-0.25. mg/L and oxidation-reduction potential (ORP) of 10-40. mv within the outer channel. Appropriate internal recycle ratio played a significant role for increasing nitrates reduction within the outer channel, however, excessively high recycle flow deteriorated nitrogen removal instead because of diluted carbon source. At recycle ratio of 9.4, TN removal efficiency further increased to about 87% at optimal DO and pre-denitrification was responsible for TN removal improvement according to nitrogen mass balances. Molecular biology analysis revealed the correlation between variations in nitrogen removal and changes in bacterial community composition. © 2013 Elsevier B.V. Source


Jiang C.,Huaiyin Normal University | Liu H.,Huaiyin Normal University | Liu H.,Northeast Normal University | Cui Y.,Huaiyin Normal University | And 3 more authors.
Optics Express | Year: 2013

We theoretically demonstrate the mechanically mediated elec-tromagnetically induced transparency in a two-mode cavity optomechanical system, where two cavity modes are coupled to a common mechanical resonator. When the two cavity modes are driven on their respective red sidebands by two pump beams, a transparency window appears in the probe transmission spectrum due to destructive interference. Under this situation the transmitted probe beam can be delayed as much as 4 μs, which can be easily controlled by the power of the pump beams. © 2013 Optical Society of America. Source


Qi X.,Shanxi University | Hou J.,Taiyuan University of Technology
Journal of Physics A: Mathematical and Theoretical | Year: 2011

In this paper, some indecomposable positive finite rank elementary operators of order (n, n) are constructed. This allows us to give a simple necessary and sufficient criterion for the separability of pure states in bipartite systems of any dimension in terms of positive elementary operators of order (2, 2) and obtain some new mixed entangled states that cannot be detected by the positive partial transpose criterion and the realignment criterion. © 2011 IOP Publishing Ltd. Source


Yang X.,North University of China | Hou H.,North University of China | Zhao Y.,North University of China | Yang L.,North University of China | Han P.,Taiyuan University of Technology
Computational Materials Science | Year: 2014

First-principles calculations have been carried out to investigate the structural, electronic and elastic properties of MgxAl 4-xSr phases. The calculated lattice parameter c and the cell volume Vcell increase with the increase of Mg content. The calculated formation enthalpies and cohesive energies show that between the two different lattice sites of Al (4d) and Al (4e) in Al4Sr unit cell, the more preferable site of substitution of Mg in Al4Sr lattice is Al (4d) lattice site. And the alloying ability and structural stability of Mg xAl4-xSr phases gradually decrease with increasing x. The densities of states (DOS) are obtained to reveal the underlying mechanism of structural stability. The metallicity of the phases is estimated. The bulk modulus, shear modulus, Young's modulus and elastic anisotropy are estimated from the calculated elastic constants. The mechanical properties of these phases are further analyzed and discussed. Gibbs free energy, entropy, Debye temperature and heat capacity are also calculated and discussed. © 2013 Elsevier B.V. All rights reserved. Source


Liao J.,Tianjin University | Wang Z.,Tianjin University | Gao C.,Tianjin University | Li S.,Tianjin University | And 6 more authors.
Chemical Science | Year: 2014

At present, liquid membranes, ion-exchange membranes and fixed carrier membranes are the three popular facilitated transport membranes for CO 2 separation. They possess their own advantages, as well as their respective deficiencies. In view of the characters of these three types of facilitated transport membrane, we report a method to combine their advantages and overcome their deficiencies. A new membrane was fabricated by establishing high-speed facilitated transport channels in the fixed carrier membrane. This membrane displays excellent CO2 separation performance and good stability. The results suggest that this is an effective way to fabricate high performance and high stability CO2 separation membranes. Furthermore, establishing high-speed facilitated transport channels in fixed carrier membranes will be a universal route to improve the performance of gas separation membranes. © 2014 the Partner Organisations. Source


Wei W.,Xian University of Science and Technology | Qiang Y.,Taiyuan University of Technology | Zhang J.,Xian University of Science and Technology
Mathematical Problems in Engineering | Year: 2013

The aim of this paper is to study relations between lattice-valued filters and lattice-valued congruences in residuated lattices. We introduce a new definition of congruences which just depends on the meet ∧ and the residuum →. Then it is shown that each of these congruences is automatically a universal-algebra-congruence. Also, lattice-valued filters and lattice-valued congruences are studied, and it is shown that there is a one-to-one correspondence between the set of all (lattice-valued) filters and the set of all (lattice-valued) congruences. © 2013 Wei Wei et al. Source


Chang S.,South China Agricultural University | Li K.-S.,South China Agricultural University | Hu J.-P.,Leshan Teachers College | Jiao X.,Taiyuan University of Technology | Tian X.-H.,South China Agricultural University
Soft Matter | Year: 2011

The major facilitator superfamily (MFS) is an important and widespread family of secondary membrane transporters. Recently, an outward-open structure of MFS, the fucose/H+ symporter FucP was determined by X-ray crystallography. In this article, the outward-open form of FucP is analyzed by elastic network models. It is found that the periplasmic half region has remarkable fluctuation, and the closure of the periplasmic half is the most dominant conformational change for outward-open conformation of FucP. To ascertain the process of transport, an adaptive anisotropic network model is applied to explore the allosteric transitions of FucP. In particular, our simulation not only yields the intermediate states similar to that seen in the EmrD crystal structure, but also exhibits the whole transport process of FucP. On the basis of the coarse-grained analyses, we propose a new working model of how FucP mediates the symport of l-fucose and a proton. The allosteric and transport knowledge of FucP revealed in this work can provide some insights into the mechanism studies of MFS and other transport proteins. © 2011 The Royal Society of Chemistry. Source


Qi X.,Shanxi University | Hou J.,Taiyuan University of Technology
Quantum Information Processing | Year: 2016

In this paper, a nonlinear entanglement witness criterion based on continuous-variable local orthogonal observables for bipartite states is established, which is strictly stronger than the the linear entanglement witnesses criterion introduced by Zhang et al. (Phys. Rev. Lett. 111:190501, 2013). This criterion is particularly applied to two-mode Gaussian states yielding a criterion in terms of the covariance matrix. Comparison with CCNR criterion is discussed. © 2015, Springer Science+Business Media New York. Source


Zhu Z.,Beijing Materials University | Zhang D.,Taiyuan University of Technology | Yan H.,Beijing Materials University | Li W.,University of Science and Technology Beijing | Qilu,Beijing Materials University
Journal of Materials Chemistry A | Year: 2013

This work developed a novel ammonium oxalate-carbonate composite co-precipitation method to prepare spinel LiNi0.5Mn 1.5O4. By this method combined with a facile hydrothermal treatment and particular cooling process, an ideal spinel with precise stoichiometric Ni/Mn and classic Fd3m structure is obtained, and furthermore, the Mn3+ content can be strictly limited. Additionally, the prepared LiNi0.5Mn1.5O4 has a spherical hierarchical morphology, composed of nano or submicron primary particles. This LiNi 0.5Mn1.5O4 shows superlative electrochemical performance. It delivers a discharge capacity of 141.2 mA h g-1, and importantly 98.2% of which discharges at 4.7 V. After 200 cycles at 0.3 C, 1 C and 3 C, the capacity retentions are 96.3%, 94.4% and 91.1%, respectively. Chemical and electrochemical measurements indicate that the elimination of the majority of Mn3+ in the obtained LiNi0.5Mn 1.5O4 results in the high capacity proportion at 4.7 V. Additionally, the retained Fd3m structure and spherical hierarchical morphology also effectively favour the cycling and rate performances. This journal is © 2013 The Royal Society of Chemistry. Source


Zhao B.,Taiyuan University of Technology | Liu J.,Shanxi Polytechnic College
Journal of Computational Information Systems | Year: 2011

The constant modulus algorithm (CMA) is a stochastic gradient adaptive algorithm that results from minimizing a no-quadratic cost function of the equalizer coefficience involving higher order statistics. The variable step-size constant modulus algorithm (CMA) solves the contradiction between convergence speed and convergence precision of the fixed step-size CMA. Among many variable step-size constant modulus algorithms, a common method is using MSE to control the step-size variation. This paper studies the influence of MSE on tracking channel and anti-interference performance of an improved variable step-size constant modulus algorithm. The computer simulation result is in good agreement with theoretical analysis. © 2011 Binary Information Press. Source


Zuo Z.-J.,Key Laboratory of Coal Science and Technology | Li J.,Key Laboratory of Coal Science and Technology | Han P.-D.,Taiyuan University of Technology | Huang W.,Key Laboratory of Coal Science and Technology
Journal of Physical Chemistry C | Year: 2014

To better understand the autoxidation mechanism of Cu-based catalysts, we studied the oxidation of Cu sheet exposed to ultrahigh vacuum and air at ambient temperature using X-ray photoelectron spectroscopy (XPS) and density functional theory. Six main stages of Cu autoxidation are revealed: (1) dissociative adsorption of O2, (2) coexistence of nondissociative and dissociative H2O adsorption, (3) diffusion of O and OH into Cu bulk, (4) formation of metastable Cu2O layer, (5) further oxidation and formation of metastable Cu(OH)2 and CuO layer, and (6) transformation phase of the metastable Cu(OH)2 to CuO. The formation of Cu(OH)2 depends on the relative humidity of air and the concentration of adsorbed OH of the Cu sheet. On the basis of these results, we propose that the preservation time of the Cu-based catalysts should be decreased or the catalysts should be preserved in a high vacuum and at low relative humidity. Considering the time of the sample preparation before ex situ XPS analysis and other surface characterizations, the Cu-based catalysts need to be etched by ∼10 s using an Ar ion gun. These findings serve as a guide for the preservation and preparation of Cu-based catalysts before actual measurement. © 2014 American Chemical Society. Source


Whittaker P.B.,University of Western Australia | Wang X.,University of Tasmania | Regenauer-Lieb K.,University of Western Australia | Chua H.T.,University of Western Australia | Chua H.T.,Taiyuan University of Technology
Physical Chemistry Chemical Physics | Year: 2013

A method for predicting the isosteric heat of gas adsorption on solid materials is developed which requires the measurement of a single isotherm - where previous methods, such as the Clausius-Clapeyron approach, require either multiple isotherms or complex calorimetric measurement. The Tóth potential function, stemming from the Polanyi potential function, is evaluated using the Langmuir and Tóth isotherm equations to generate new equations for the isosteric heat. These new isosteric heat equations share common parameters with the isotherm equations and are determined from isotherm fitting. This method is demonstrated in the literature for gas adsorption onto solid adsorbates including zeolites of various surface charge character and non-porous rutile phase titanium dioxide. Predictions are made using the new isosteric heat equations and then compared to calorimetric data. © the Owner Societies 2013. Source


Wang L.,Taiyuan University of Technology
Proceedings - 2011 6th International Conference on Pervasive Computing and Applications, ICPCA 2011 | Year: 2011

Internet of things (IoT) aims at connecting everything and it would be a complex system with huge amount of resource. It can be abstracted as a complex network model. Discovering latent community structure will help understand large network structure, design high quality data integration, connection, communication mechanism based on suitable community topology in IoT. The diversity and complexity of real world make latent communities always be overlapped other than disjoint structure. Base on the observation that more common neighbors two nodes share, more chance they have to be in common community, in this paper we project a Neighbor-based Hierarchical Overlapped Community algorithm NHOC and a method for evaluating the discovered overlapping community quality. NHOC is polynomial and does not need community size or number in advance. It can discover overlapping or disjoint communities and with the parameters changing it can show different community structures in variable granularity. Experiments show that NHOC gives the more proper result than other algorithms when finding overlapping communities or disjoint communities. © 2011 IEEE. Source


Zhang Z.,Taiyuan University of Technology
Journal of molecular modeling | Year: 2014

To understand the impact of C = C double bonds in acyl chains of unsaturated triglycerides on the reaction mechanism and product composition in their initial pyrolysis process, ReaxFF molecular dynamics simulations were carried out using a molecular model, trilinolenin, at temperatures of 2000, 2250, and 2500 K. Analyses indicated that the observed pyrolysis mechanisms of unsaturated triglyceride are nearly identical to the saturated triglyceride, and the pyrolysis products also include alkanes, alkenes, alkadienes, aromatics, oxygenated species, CO2, and H2. The formation of intermediates and products is a sequential process. Three C--O bonds in trilinolenin molecule are usually successive dissociated first, leading to the formation of unsaturated C3H5· radical and straight-chain C18H29O2· (RCOO·) radicals. Following that, the deoxygenated alkenyl chain is produced through decarboxylation of RCOO · radicals with consequent release of CO2. The resulting hydrocarbon radicals undergo a variety of disproportionation, isomerization, and hydrogen-transfer reactions, yielding straight and branched-chain hydrocarbons. It was found that the scission of C--O bond and decarboxylation should preferentially occur before the cleavage of the C--C bond β to the C = C bond in the initial decomposition process of unsaturated trilinolenin. In addition, the formation of cyclic hydrocarbons could proceed through intramolecular cyclization mechanisms, including non-radical electrocyclic, biradical cyclization and cyclization of alkenyl radical, which are inconsistent with previously proposed bimolecular Diels-Alder addition mechanisms. More rapid pyrolysis of trilinolenin would occur at higher temperatures without significantly affecting the apparent reaction mechanisms of trilinolenin pyrolysis in the considered temperature range. Aromatic ring structures are observed to be stable after formation and do not decay within the 500 ps simulation period. Source


Deng T.,Southwest University | Deng T.,Taiyuan University of Technology | Xia G.Q.,Southwest University | Wu Z.M.,Southwest University | Wu Z.M.,Nanjing Southeast University
Nonlinear Dynamics | Year: 2014

Based on two mutually coupled vertical-cavity surface-emitting lasers (MC-VCSELs) subject to a bandwidth-enhanced chaotic signal injection, a bidirectional dual-channel broadband chaos communication system is proposed and investigated numerically. The results show that, adopting a bandwidth-enhanced chaotic signal (about 33 GHz) from a driving VCSEL (D-VCSEL) to drive two MC-VCSELs, high-quality isochronal chaos synchronization with over 30 GHz bandwidth between two corresponding LP modes in the two MC-VCSELs can be obtained under proper driving injection, and this synchronization has high tolerance to mismatched intrinsic parameters and frequency detuning. Moreover, based on the broadband chaos synchronization of two corresponding LP modes, the bidirectional dual-channel high-speed chaos communication can be realized and the communication performances have also been preliminarily examined under chaos masking (CMS) encryption scheme. © 2013 Springer Science+Business Media Dordrecht. Source


Kang J.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

In this paper, the models of traditional anti-seismic and base-isolated masonry and concrete frame composite structures were created by the three-dimensional finite element program and their time history responses were analyzed under the actions of different seismic waves. The results show that whether they were under the action of frequently occurred earthquake or rarely occurred earthquake, the story shears of base-isolated structure are far less than those of traditional anti-seismic structure; the lateral displacements of the former are nearly translational, while those of the latter are approximately parabolic; and the fundamental period of the former is much longer than the counterpart. In conclusion, the seismic fortification intensity of base-isolated structure is one or two degree less than that of traditional anti-seismic structure, and adopting the base-isolated structure will protect the life-safety and property of people and achieve good economic benefits as well. Source


Lu L.,North University of China | Zhang S.,Beihang University | Yan S.,Taiyuan University of Technology
International Journal of Electrochemical Science | Year: 2015

AuNi/C catalyst (AuNi nanoparticles supported on activated carbon) is prepared by a polyol reduction process. The alloying between Au and Ni and the removal of unalloyed Ni are achieved by the heat and acid treatment. The electrochemical measurement results indicate that the alloying treatment process is favourable to improve the electrocatalytic activity of the AuNi/C catalyst. Moreover, the area-specific electrochemical activity of each AuNi/C catalyst is better than that of the Au/C catalyst, showing the effect of the Ni component on the electrocatalytic activity of the Au/C catalyst is significant. © 2015 The Authors. Source


Yang S.-S.,Taiyuan University of Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

Deformation and strength feature of roadway surrounding rock and the acting mechanism of support force were studied, and fluctuant equilibrium theory of entire proceeding of interaction between surrounding rock and support of roadway was put forward. Effect of bolt action was studied, the result indicates that, the bolt action can improve strength and elastic modulus, decrease Poisson's ratio and improve the stress status of bolted rock. The evolution principle of axial bolting force was studied, and new conceptions of the first critical deformation and the second critical deformation of bolted strata were put forward, three stage evolution principle of axial bolting force and the bolted strata deformation was revealed. The value of the second critical deformation increases with the anchored length. A new point was put out designing the anchored length of bolt should base on the deformation of road way. According to the mechanical character of broken rock mass that low tensile strength but higher compressive strength under support and according to varied mechanical character of boards with different ratio of thickness to height, thick bolted board theory was put forward. Source


Yi-Qing L.,Taiyuan University of Technology
International Journal of Earth Sciences and Engineering | Year: 2014

This paper took the representative slope under the underground miningthe slope on the Fengmao Peak in the city of Gujiao of Taiyuan, as an example. Then it conducted numerical simulation to analyze the ground stress, deformation displacement and stability state of the unstable slopes formed by underground coal mining under the natural and storm working conditions, and obtained the impact of underground mining on the slope deformation. It could provide a reference for the similar researches. © 2014 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved. Source


Chen S.-H.,Taiyuan University of Technology | Hu Z.-Q.,China University of Mining and Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Treatment of coal gangue piles with spontaneous combustion has a heavy demand to inert materials. To reach the aims: saving soil, utilization of waste and ensuring environmental benefits, the study on the optimum volume ratio of fly ash to replace partial soil as covering materials for coal gangue piles with spontaneous combustion is purposeful. Fly ash was mixed evenly with silt, silt clay according to different volume ratio. Through the indoor simulation experiment, air isolation effectiveness of different ratio mixed materials of soil and fly-ash was tested, and the influence of fly-ash with different volume to the air barrier property of hybrid materials was analyzed. The results show that, when mixed fly-ash in silt-clay and silt, the air barrier property of mixed materials decreases steadily with the increasing of fly-ash, and approximate expressions respectively shows as an exponential function between permeability and fly-ash content at various pressure differentials. Ash content of 50% and 30%, respectively, determines the isolation changes, which is an important characteristics. It suggests that fly ash content is less than 50% and 30% respectively in silty-soil and in silt-clay. Source


Wang Y.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

This paper is to analyze the feature of combination of foreign and local elements in architecture and summarize the creative methods applied in the baroque catholic churches in Shanxi based on the related surveys and researches. It's a good example explaining that the process of the gradual recognition of foreign architecture forms is also a process of localization. During this process, the local craftsmen have gradually created new and localized architectural forms based on their combination of traditional aesthetics and local techniques, which is significantly enlightening on the localized design of contemporary architectures. Source


Wang T.,Taiyuan University of Technology | Guo S.,Hubei Engineering University | Lee C.-G.,Kings College
International Journal of Advanced Manufacturing Technology | Year: 2014

Cloud manufacturing (CMfg) is emerging as an advanced service-oriented manufacturing model for the manufacturing industry. It is changing the way manufacturing enterprises organize production activities in that tangible and intangible manufacturing resources encapsulated as virtualized manufacturing services are provided to customers. In this background, CMfg task semantic modeling and description is proposed to address different challenges such as matching with manufacturing services. Firstly, some of the essential features of CMfg tasks are briefly discussed and classification as well as the modeling requirements of CMfg tasks is also investigated, and then this paper proposes the modeling framework of CMfg task to solve the general CMfg task ontology (GCMT-Ontology) construction and the task sub-ontology matching from GCMT-Ontology. In GCMT-Ontology construction process, the original CMfg task ontology (OCMT-Ontology) is built from the CMfg task description model, and then an ontology learning approach is advanced to perfect the GCMT-Ontology with graph-based semantic similarity algorithm. In task sub-ontology matching process, semantic feature values of concepts are calculated to extend the semantic content of the task document, and the extended concepts are input to find the sub-ontology by computing minimum connected sub-graph. Finally, the proposed framework is realized in a prototype system, and an example of cement grinding mill assembling task is carried out in a group enterprise to illustrate the application. The results show that the proposed method improves enterprise collaboration and interoperation effectively. © 2014 Springer-Verlag London. Source


The settlement pattern of a village is selected and formulated as result of interaction between the natural environment and humanistic environment, rather than any accidental causes. This paper is to analyze the internal causes of the formation of the settlement pattern of Shangzhuang Village based on the research on the structure and layout of this famous village. Shangzhuang Village, being located in Yangcheng County, Shanxi Province, has a long history and rich culture. The study is intended to find some enlightenment from this vernacular architecture as a scientific swatch for the protection and sustainable development of such villages nowadays. Source


Yu J.,Shenyang Aerospace University | Yu J.,University Of Science And Technology Liaoning | Yin F.,Shenyang Aerospace University | Yin F.,University Of Science And Technology Liaoning | And 3 more authors.
Fuel | Year: 2013

An integrated hot coal gas cleaning process is proposed with emphasis on simultaneous removal of multiple impurities including sulfur containing species, NOx precursors, mercury and tarry materials. Acti-vated- char-supported sorbents were synthesized by gasifying Fe and Mo impregnated Chinese lignite coal in steam (15%, vol) at 1100 K for 15 min. Sulfur removal properties of the sorbent samples were examined by sulfidation experiments using simulated coal gases (with 4700 ppmv H2S and 470 ppmv COS) at a space velocity of 1000 h-1 using a fixed-bed quartz reactor at the temperature range of 673-873 K. The SEM with EDS and XRD were used to examine the physical and chemical changes in the sorbents during sulfidation. The active metal oxides components were dispersed in the char matrix as nanosize particles resulting in a high reactivity of the sorbents towards H2S and COS contained in coal gases. Under the conditions in this study, the sorbents can effectively remove H2S and COS from the simulated coal gases with high efficiency. Sulfur removal is influenced by the level of iron-loading. The presence of Mo along with Fe in the char-supported sorbents can significantly increase the desulfurization efficiency. © 2010 Elsevier Ltd. All rights reserved. Source


Wang J.,Taiyuan University of Science and Technology | Zhang Y.,Taiyuan University of Science and Technology | Han L.,Taiyuan University of Science and Technology | Han L.,Taiyuan University of Technology | And 2 more authors.
Fuel | Year: 2013

Two iron oxide based sorbents, TG-1 and TG-F, with high desulfurization efficiency, were selected for simultaneous removal of H2S and Hg from simulated syngas. Our evaluation tests were carried out using a fixed bed reactor at different temperatures and in ambient atmosphere. The different activities for the simultaneous removal of H2S and Hg between TG-1 and TG-F or TG-1-S (denoted as such after uptake of H2S) were compared. The results show that the two iron oxide based sorbents can capture Hg effectively from simulated syngas. The preferred temperature for Hg removal using the TG-F and TG-1 sorbents are 60-120 °C and 100-140 °C, respectively. The Hg absorption capacity of TG-1 is higher than that of TG-F under the same conditions. CO and H2 in the feed gas have negligible effect on the efficiency of Hg removal. H2S is favoured for the removal of Hg over iron-based sorbents and it was found that the influence of H2S concentration on the Hg capacity of the TG-1 and TG-F sorbents are different. It is found that the main active components of the two sorbents during the reaction are different. After several desulfurization cycles, the TG-1-S sorbent has a high efficiency for Hg removal from the simulated syngas. © 2012 Elsevier Ltd. All rights reserved. Source


Liang Y.,Taiyuan University of Technology
Advanced Materials Research | Year: 2012

A new idea of multilevel leakage protective system is proposed in this paper in accordance with the deficiencies covered in present leakage protective system used in underground low voltage distribution networks. The leakage is especially analyzed, which occurred from transformer secondary to general switchgear or from general switchgear to branch switchgear. The new leakage protective equipments which based on the new idea are also introduced here. Finally equipments are tested. The measuring results show that equipments can form a leakage protective system, the selective leakage protection of which has no time difference. Consequently, the level of safety for underground LV distribution networks is greatly improved. Source


Chang S.,South China Agricultural University | Hu J.-P.,Leshan Teachers College | Lin P.-Y.,South China Agricultural University | Jiao X.,Taiyuan University of Technology | Tian X.-H.,South China Agricultural University
Molecular BioSystems | Year: 2010

The l-arginine (Arg)/agmatine (Agm) antiporter AdiC is a vital transport protein of the arginine-dependent extreme acid resistance system of enteric bacteria. Recently, both substrate-free and Arg-bound structures of AdiC were determined by X-ray crystallography. In this article, the two different proteins were investigated with three simple models. Gaussian network model provided the information of conformational changes. It is found that Arg binding induces structural rearrangement in the extracellular domain, and transmembrane helix 6 (TM6) has the most pronounced trend of conformational changes. The moving directions of fluctuation regions were further ascertained by using anisotropy elastic network model and cross-correlation analysis. Interestingly, the two substrate-binding sites hypothesis of AdiC was confirmed directly by molecular docking. Furthermore, the binding preferences of these two sites were explained from the aspects of electrostatic complementarity and geometric matching. These simple coarse-grained analyses can be used as a general and quick method for the mechanism studies of transport proteins. © 2010 The Royal Society of Chemistry. Source


Xue C.X.,North University of China | Xue C.X.,University of Akron | Pan E.,University of Akron | Zhang S.Y.,Taiyuan University of Technology
Smart Materials and Structures | Year: 2011

A simple nonlinear model is proposed in this paper to study the solitary wave in a circular magneto-electro-elastic rod. Based on the constitutive relation for transversely isotropic piezoelectric and piezomagnetic materials, combined with the differential equations of motion, we derive the longitudinal wave motion equation in a long circular rod. The nonlinearity considered is geometrically associated with the nonlinear normal strain in the longitudinal rod direction and the transverse Poisson's effect is included by introducing the effective Poisson's ratio. The nonlinear solitary wave equation is solved by the Jacobi elliptic function expansion method and numerical examples demonstrate not only the existence of such a wave but also some interesting characteristics of the solitary wave in the rod made of different multiphase coupled materials. © 2011 IOP Publishing Ltd. Source


Zhao Y.,Taiyuan University of Technology
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2012

Based on the Reynolds time-averaged N-S equations, the SST k-ω turbulence model and the SIMPLEC algorithm, the 3D steady turbulent flow within a multi-stage double-suction centrifugal pump, which was installed in Xiecun Pump Station of Beizhao Yellow River Diversion Project, was simulated. The velocity vector field and other information at different operation conditions were obtained, the pump performance was predicted and was compared with the field test data. The results show that the flow fields are uniform in both the suction chamber of the first-stage and the volute of the second-stage. Because of the complicated structure of crossover and fluid itself inertia, a vortex region is found in the abrupt expansion region of the crossover, and the size of the vortex region is related to flow rate. The predicted head is consistent with the field test data, and the maximum error between them is 2.7%. The hydraulic efficiency curve estimated against capacity resembles to the pump efficiency curve measured in the pump station as well. The simulation of flow within a pump can provide a reference for performance prediction and structure optimization during the pump design process in an engineering project. Source


The development of efficient sub-10 nm ultrasmall upconversion nanoparticles will open the door to the exciting application in biological labelling and imaging. In this paper, we demonstrated a facile method for the synthesis of monodisperse sub-10 nm hexagonal-phased LaF3 nanoparticles doped with upconverting lanthanide ions (Yb3+/Ln3+, Ln = Er3+, Tm3+, and Ho3+). The particle size of the as-synthesized LaF3 nanoparticles can be tuned by varying the preparation temperature. Upon excitation at 980 nm, the LaF3:Yb3+/Ln3+ nanoparticles showed intense upconversion emissions, and the colour output can be precisely modulated by changing the species and concentration of the lanthanide activators. In order to further enhance the upconversion emission intensity of the ultrasmall LaF3:Yb3+/Ln3+ nanoparticles, we adopted the strategy of core–shell nanostructured design to minimize the surface quenching effect. After coating an inert LaF3 shell, a maximum ninefold enhancement in upconversion luminescence was achieved under 980 nm excitation. These as-prepared lanthanide-doped LaF3 upconversion nanoparticles may find promising applications in biomedicine fields as luminescent nanoprobes. © 2015, Springer Science+Business Media New York. Source


Hu H.,Taiyuan University of Technology
International Journal of Online Engineering | Year: 2016

An online automatic disaster monitoring system can reduce or prevent geological mine disasters to protect life and property. Global Navigation Satellite System receivers and the GeoRobot are two kinds of in-situ geosensors widely used for monitoring ground movements near mines. A combined monitoring solution is presented that integrates the advantages of both. In addition, a geosensor network system to be used for geological mine disaster monitoring is described. A complete online automatic mine disaster monitoring system including data transmission, data management, and complex data analysis is outlined. This paper proposes a novel overall architecture for mine disaster monitoring. This architecture can seamlessly integrate sensors for long-term, remote, and near real-time monitoring. In the architecture, three layers are used to collect, manage and process observation data. To demonstrate the applicability of the method, a system encompassing this architecture has been deployed to monitor the safety and stability of a slope at an open-pit mine in Inner Mongolia. Source


Wang R.,Taiyuan University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

Realizes the flotation process cleaned coal ash soft Sensor is the key of flotation process automation. First introduction to least square support vector machines algorithm, subsidiary variable choice research on flotation process cleaned coal ash soft sensor is carried out, reasonable subsidiary variable is selected by experiment, soft sensor accuracy of coal change is proposed, experiment show that model accuracy is sensitive for coal change. This soft sensor model is help to flotation process automatic control. © 2011 Springer-Verlag. Source


Guo H.-X.,Taiyuan University of Technology
Wool Textile Journal | Year: 2013

In this paper, several innovative racked stitch sweater hand samples were developed after several debugging. That could be formed by the applying of drop needle, widening and narrowing, loop transfer and the two kinds stitches. And weaving after choice of the appropriate yarn, machine gauge and repeatedly debugging on hand knitting machine, forming a variety of racked stitch fabric sample, such as gradient, convex, and so on, which showed the new organization structures very well. The design of fabric sample completely changed the traditional single basic organizational structure, while its appearance effect can satisfy people's requirements of diversification and fashion to knitting machine fabric. At the same time, these fabric fully reflected the development trend of contemporary fashion sweaters. In practice, you can directly use the several racked stitch fabric sample in the overall sweater production or can also combined use them according to the overall style of sweaters. Source


Shen L.,Taiyuan University of Technology | Wang P.,China Agricultural University | Zhang L.,China Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

Aiming at reducing agricultural pollution caused by plastic film, effect of degradable film on soil temperature, soil moisture, maize growth and development, maize yield and relevant characteristics were studied through comparing with the plastic film and open field. The results indicated that soil temperature at surface and 10 cm depth in two months after sowing, soil moisture in 0-20 and >20-40 cm profile from sowing to big trumpet stage, were all higher for degradable film covering than open field. Growth progress, seedling rate, root number during shooting stage, plant height, leaf area and dry weight of maize in different stages were all higher for degradable film covering. Kernel number, thousand-grain weight, and yield of maize under degradable film covering were increased by 9.6%, 20.9%, 35.1% respectively. Degradable film did not show significant difference with plastic film, and it could be applied to agriculture instead of plastic film. Source


He L.L.,China Academy of Engineering Physics | Chen X.W.,China Academy of Engineering Physics | Wang Z.H.,Taiyuan University of Technology
International Journal of Impact Engineering | Year: 2016

Two-group penetration tests of Concept Projectile for High-speed Penetration (CPHP) are carried out with striking velocity ranging from 1130 m/s to 1650 m/s. Almost all projectiles are integral after penetration except the one at striking velocity 1650 m/s. The maximum dimensionless Depth of Penetration (DOP) reaches 78.9 at striking velocity 1415 m/s with the concrete strength as 33.4 MPa. It further confirms that CPHP has excellent structural stability and penetration performance into concrete target at high striking velocities. The penetration performances of CPHP made of different materials are also compared. It indicates that the strength and ductility of material jointly control the penetration performance of CPHP. The mass loss of CPHP distributes not only in its nose but also in its shank. The CPHP nose still keeps ogival and the surface of CPHP shank recedes inward. Furthermore, the mass loss mechanism is studied by metallographic observation. It indicates that the heat transformed from frictional work between target and projectile is the main cause of Heat Affected Zone (HAZ), and the peeling of molten surface layer is the main cause of mass loss. Several White Narrow Bands (WNBs) in CPHP nose tip contribute minor mass loss due to its rare number and limited dimensions. Finally, the analytical model for DOP of CPHP was derived. The model prediction is validated by the available experimental result. © 2016 Elsevier Ltd. All rights reserved. Source


Yang X.,Jiangsu University of Science and Technology | Song X.,Jiangsu University of Science and Technology | Chen Z.,Taiyuan University of Technology | Yang J.,Nanjing University of Science and Technology
International Journal of Machine Learning and Cybernetics | Year: 2012

Multigranulation rough set is a new and interesting topic in the theory of rough set. In this paper, the multigranulation rough sets approach is introduced into the incomplete information system. The tolerance relation, the similarity relation and the limited tolerance relations are employed to construct the optimistic and the pessimistic multigranulation rough sets, respectively. Not only the properties about these multigranulation rough sets are discussed, but also the relationships among these multigranulation rough sets models are explored. It is shown that by the multigranulation rough sets theory, the limited tolerance relations based multigranulation lower approximations fall between the tolerance and the similarity relations based multigranulation lower approximations, the limited tolerance relations based multigranulation upper approximations fall between the similarity and the tolerance relations based multigranulation upper approximations. Such results are consistent to those in single-granulation based rough sets models. © 2011 Springer-Verlag. Source


Liu W.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

According to the fact that the research about temperature stress of steel structure is few. In this paper, a factory steel truss which support raw material pipeline as an example, taking the 34-hour on-site continuous strain test on the steel truss caused by sunshine temperature. The experimental results show that the temperature stress has a great influence on the internal force of steel truss. And the results can provide a basis for engineering design. © (2013) Trans Tech Publications, Switzerland. Source


Zhang H.,Taiyuan University of Technology
Journal of Computational Information Systems | Year: 2013

Set-valued information systems are brought forth from models of single-valued information which is an important formal framework for the development of decision support systems. In the light of semantic interpretation, we can classify into two categories: disjunctive and conjunctive. In this paper, the former is discussed. First, dominance relations are introduced and establish a rough set approach in disjunctive set-valued ordered information systems. Furthermore, the concept of fuzzy dominance relation between two objects is put forward and we define fuzzy dominance relation matrix in disjunctive set-valued information systems based on dominance relations. Finally, through calculating average uncertainty quantity of the fuzzy dominance relation in disjunctive set-valued ordered information systems, we prove that average uncertainty quantity of the fuzzy dominance relation in a disjunction set-valued ordered information system along with enhancement of knowledge discernment increases monotonously. These results give a kind of feasible approaches to discover and acquisition of knowledge in disjunctive set-valued ordered information systems. © 2013 Binary Information Press. Source


Guan G.,Hirosaki University | Chen G.,Hirosaki University | Kasai Y.,Industrial Research Institute | Lim E.W.C.,National University of Singapore | And 5 more authors.
Applied Catalysis B: Environmental | Year: 2012

Calcined scallop shell (CS) exhibits alkaline property with a porous structure, and could be applied for the adsorption and decomposition of biomass-derived tar. In this study, steam reforming of tar derived from pruned apple branch over CS was investigated in a fixed bed at 650°C. It was found that CS had good activity for the steam reforming of tar to produce synthesis gas (syngas), and was able to be recycled. To promote the gas production efficiency, iron or nickel was supported on the CS, and used for the reforming of tar. The effect of heating rate on the gas production rate was investigated, and it was found that reduced iron- or nickel-supported CS showed better activities under the condition of rapid heating. Iron- or nickel-based catalyst in its oxide state was also investigated for the reforming of tar. No catalytic activity was found at the beginning, but good activity appeared after approximately 30min of reaction when the metal oxide was reduced to its metallic form by the initially generated syngas (CO and H 2) from the pyrolysis of biomass without the aid of catalyst. Iron and nickel in their metallic forms rather than their oxide ones were considered as active sites for the reforming of tar. Furthermore, the alkaline elements in the biomass, which could enhance the activity of the catalysts, were identified to be accumulated on the surface of the catalysts with the biomass-derived tar. As a result, a larger amount of syngas was produced when the regenerated catalysts were applied. Based on these experimental results, a possible catalytic process was proposed. © 2011 Elsevier B.V.. Source


Shi L.,Taiyuan University of Technology | Sun N.,Shandong University | Zheng L.,Shandong University
Chemical Communications | Year: 2015

Trimeric and tetrameric supra-amphiphiles with rich self-assembly behaviors were fabricated in the adipic acid-dodecylamine mixed solution under the effect of hydrogen bonding. The hydrogen bonding can be switched "on" and "off" via pH variation and CO2 stimulus, thus leading to finely controlled topologies and self-assembly behaviors of oligomeric supra-amphiphiles. © The Royal Society of Chemistry. Source


Zhang Y.F.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2012

A discretization elastic-plastic material model was used for simulating the shock waves transmission within metallic foams. The density heterogeneity of metallic foams was considered. Several types of aluminum foams are studied on the transmission of displacement and stresses wave under impact loading. The results reveal the characteristics of compressive wave propagation within the metal foams. Under low impact pulses, considerable energy is dissipated during the progressive collapse of foam cells, and then reduces the crush of the objects. When the pulse is high sufficiently, on the fixed end of foam, stress enhancement may take place, where high peak stresses usually occur. The magnitude of the peak stress depends on the relative density of foams, the pulse loading intensity, the pulse loading duration as well as the density homogeneity of foam materials. This research offers valuable insight into the reliability of the metal foams used as vehicles and protective structure. © (2012) Trans Tech Publications, Switzerland. Source


Hou J.,Shanxi University | Hou J.,Taiyuan University of Technology | Guo Y.,Shanxi University | Guo Y.,Shanxi Datong University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2010

The question of under what conditions different witnesses (e.g., W 1,W 2) may detect some common entangled states [i.e., there exists some state ρ so that Tr(W 1ρ) < 0andTr(W 2ρ) < 0] is answered for both finite-dimensional and infinite-dimensional bipartite systems. Finitely many different witnesses W 1,W 2,...,W n can detect some common entangled states if and only if ∑ n i=1 d iW i is still a witness for any nonnegative numbers d 1,d 2,...,d n with∑ n i=1 d i = 1; they cannot detect any common entangled state if and only if ∑ n i=1 c iW i is a positive operator for some nonnegative numbers c 1,c 2,...,c n with ∑ n i=1 c i = 1. For two witnesses W 1 and W 2 more can be said. First, W 1 and W 2 can detect the same set of entangled states if and only if W 1 = aW 2 for some number a > 0. Second, W 2 can detect more entangled states than W 1 can if and only if W 1 = aW 2 + D for some numbera > 0 and a positive operator D. As an application, some characterizations of the optimal witnesses are given and some structural properties of the decomposable optimal witnesses are presented. © 2010 The American Physical Society. Source


Hou J.,Taiyuan University of Technology | Hou J.,Shanxi University | Qi X.,Shanxi University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2010

It is shown that every entangled state in an infinite-dimensional composite system has a simple entanglement witness of the form αI+T with α a non-negative number and T a finite rank self-adjoint operator. We also provide two methods of constructing an entanglement witness and apply them to obtain some entangled states that cannot be detected by the positive partial transpose criterion and the realignment criterion. © 2010 The American Physical Society. Source


Tang Y.,Taiyuan University of Technology
International Journal of Coal Preparation and Utilization | Year: 2015

Coal is rich in a variety of elements and minerals, which influence the spontaneous combustion of coal. This study investigated the effects of manganese (Mn) and phosphorus (P) on the spontaneous combustion of coal. Six Mn- and P-containing additives were added to coal and the gases released by programmed temperature heating were collected. The results showed that Mn-containing additives promoted the spontaneous combustion of coal as the temperature increased to 60°C, while P-containing additives showed significant inhibition until the temperature reached 150°C. Infrared spectra suggested that Mn enhanced the decomposition of the R-O, C-O, and -CH2 in the coal, while P significantly inhibited the decomposition of R-O and C-H. Thermogravimetry/differential thermal analysis (TG/DTA) implied that Mn promoted the oxy-genolysis of coal and released more heat, while P delayed the critical temperature of the spontaneous combustion of coal. In addition, by investigating the contents of Mn and P in the coal from 18 coal fields in China, it was found that in general, spontaneous combustion seldom occurred in mine areas with a high P content. This could possibly be attributed to the fact that Mn enhanced the generation of free radicals through electron transfer, while P played an inhibiting role by capturing free radicals. © 2015 Copyright © Taylor & Francis Group, LLC. Source


Zhang H.-W.,Xinzhou Teachers University | Xue H.-B.,Taiyuan University of Technology | Nie Y.-H.,Shanxi University
AIP Advances | Year: 2013

The full counting statistics of electron transport through a quantum dot (QD) doped with a single magnetic impurity weakly coupled to one ferromagnetic (F) and one normal-metal lead (N) is studied based on an efficient particle-number-resolved master equation. We demonstrate that the current noise properties depend sensitively on whether the source-electrode is the ferromagnetic lead and the type of exchange coupling between the conduction electron and magnetic impurity spin. For the F-QD-N system, namely, the ferromagnetic lead as source electrode and the normal-metal lead as drain one, the super-Poissonian noise in the anti-ferromagnetic coupling case can appear; whereas for the ferromagnetic coupling case the super-Poissonian noise does not appear. As for the N-QD-F system, the super-Poissonian noise in the ferromagnetic coupling case can appear in a relatively large bias voltage range; while for the anti-ferromagnetic coupling case, the super-Poissonian noise appears only in a relatively small bias voltage range. These super-Poissonian noise characteristics can be used to reveal the type of exchange coupling between the conduction electron and magnetic impurity spin, and can be qualitatively attributed to the spin-blockade mechanism and the effective competition between fast and slow transport channels. © 2013 © 2013 Author(s). Source


Guo Y.,Shanxi Datong University | Guo Y.,Taiyuan University of Technology
International Journal of Modern Physics B | Year: 2013

Measurement-induced nonlocality (MIN), introduced by Luo and Fu [Phys. Rev. Lett. 106, 120401 (2011)], is a kind of quantum correlation which is different from entanglement and quantum discord (QD). MIN is defined over one-sided projective measurements. In this paper, we introduce a MIN over two-sided projective measurements. The nullity of this two-sided MIN is characterized, a formula for calculating two-sided MIN for pure states is proposed, and a lower bound of (two-sided) MIN for maximally entangled mixed states is given. In addition, we find that (two-sided) MIN is not continuous. Both finite- and infinite-dimensional cases are considered. © 2013 World Scientific Publishing Company. Source


Wang L.,Taiyuan University of Technology
Journal of Networks | Year: 2011

Advanced network communication technology decreases data transmission error and make heterogeneous protocols interaction possible, but there still exits misunderstanding for transferred content in computer communication. Inspired by human's communication way, a kind of content and context awareness protocol base on knowledge (abbr. KC2A2P) is proposed in this paper. A common shared protocol ontology is built that includes content, context and act in order to not only guide the different protocol terms mapping but also provide an intelligent protocol encoding framework. To avoid unnecessary communication load, event calculus is used to build the axiom of communication cognition and three basic encoding rules are made that can adjust the message entity base on the application context. Furthermore, some experiments are given to show KC2A2P would improve the meaning delivery and even help to build trust relationship. © 2011 Academy Publisher. Source


Zhang S.,Taiyuan University of Technology | Zhang X.,Shanxi University
IEEE Transactions on Parallel and Distributed Systems | Year: 2015

The k -Ary n-cube Qk n is one of the most attractive interconnection networks for parallel and distributed systems. In this paper, we consider the problem of a fault-free hamiltonian cycle passing through prescribed edges in a k -Ary n -cube Qk n with some faulty edges. The following result is obtained: For any n≥ 2 and k≥ 3, let F E(Qk n), P E(Qk n) F with P ≤ 2n-2 , F ≤ 2n-(P +2). Then there exists a hamiltonian cycle passing through all edges of P in Qk n-F if and only if the subgraph induced by P consists of pairwise vertex-disjoint paths. It improves the result given by Yang and Wang. © 1990-2012 IEEE. Source


Yang D.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2012

This paper introduced the Liner slip deformation (LSD) fracture media model theory, and this theory is applied into the two component numerical simulation in HTI(LSD) media using the finite element method of the anisotropic elastic wave. By means of the numerical simulation paper revealed the wave field characteristics of the fracture parameters. The conclusion has an important sense for the application of the LSD fracture media model theory in the field of fracture detection and detection of fracture containing fluid. © (2012) Trans Tech Publications. Source


Yuan H.-P.,Shanghai JiaoTong University | Cheng X.-B.,Shanghai Municipal Drainage Operation Ltd. | Chen S.-P.,Shanghai Environmental Sanitation Engineering Design Institute | Zhu N.-W.,Shanghai JiaoTong University | Zhou Z.-Y.,Taiyuan University of Technology
Bioresource Technology | Year: 2011

The enhancements of electrolysis-pretreated conditioning were investigated in this study. Normalized capillary suction time (CST) was used to evaluate sludge dewaterability. Extracellular polymeric substance (EPS) concentration, viscosity and scanning electron microscopy (SEM) were determined to explain the observed changes in conditioning process. It indicated that pretreatment at 50v and 5min with Ti/RuO2 anode was determined to be the optimal condition, which generated the lowest normalized CST and optimal soluble EPS concentration, leading to the decreasing of viscosity. EPS had positive correlation with the normalized CST. Subjecting to a combination of electrolysis pretreatment and flocculants conditioning, 50% dosage of cationic polyacrylamide (PAM) could be reduced. When co-conditioned with electrolysis and polymerization ferric sulfate (PFS), it did not present any clear advantages over PFS conditioning alone. Furthermore, SEM investigation indicated that electrolysis pretreatment could rupture sludge, release the interstitial water and extracellular substances, especially protein and polysaccharide, and consequently enhance its dewaterability. © 2011 Elsevier Ltd. Source


Tian Y.,Taiyuan University of Technology
Journal of Computational Information Systems | Year: 2013

Particle swarm algorithm has remarkable advantages in finding optimal solution of the multidimensional function, such as high quality result and fast convergence rate. However, the optimal performance would decrease dramatically and be likely to fall into the local optimal solution when the dimension of functions increases. A particle swarm optimization algorithm was proposed based on the dynamic topology structure of KRTG, and using K-means clustering algorithm to improve. From the point of view of the neighborhood structure of particles, the algorithm adjusts topological structure of population dynamically, and increases the diversity of population, so that the algorithm converges to the global optimal solution. The simulation experiment of kernel clustering shows that convergence rate of the algorithm and accuracy of solution are satisfactory when finding optimal solution of the multidimensional function. Copyright © 2013 Binary Information Press. Source


Guo W.,Taiyuan University of Technology | Guo Z.,HSBC
Advanced Materials Research | Year: 2013

The flame used in combustion flame spraying is typical of a high-temperature free jet. The flow fields of free jets are multi-phase flows that couple the mass and heat transfer. The analytical and numerical solutions to turbulent flows are engineering approximations. This work uses Prandtle's mixing-length theory to describe the flame spreading of free combustion spray jet and uses nozzle spray model to describe the distribution of the powder particles sprayed from powder nozzle to the substrate surface. The nozzle geometry and the parameters determine the distribution of the powder particles. The nozzle spray model has the same physical meaning with the jet spreading angle. Experimental measurements were carried by a high-speed CCD camera. © (2013) Trans Tech Publications, Switzerland. Source


Li Q.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

With the development of science and technology and the improvement of people's living standard, Natural gas has been widely applied to daily life. But the sharp increase in natural gas explosion accident. In this paper, Analysis of the effects of gas explosion on the structure, and the safety of the structure was evaluated. By detecting the damage phenomena of gas explosion in a civil building, use the characteristics and law of the gas explosion and finite element simulation analysis method. © (2013) Trans Tech Publications, Switzerland. Source


Yan M.,Taiyuan University of Technology | Yan M.,CAS Institute of Botany | Zhou G.,CAS Institute of Botany | Zhang X.,CAS Institute of Botany
Plant and Soil | Year: 2014

Aims: Soil respiration in forest plantations can be greatly affected by management practices such as irrigation. In northwest China, soil water is usually a limiting factor for the development of forest plantations. This study aims to examine the effects of irrigation intensity on soil respiration from three poplar clone plantations in this arid area. Methods: The experiment included three poplar clones subjected to three irrigation intensities (without, low and high). Soil respiration was measured using a Li-6400-09 chamber during the growing season in 2007. Results: Mean soil respiration rates were 2.92, 4.74 and 3.49 μmol m-2 s-1 for control, low and high irrigation treatments, respectively. Soil respiration decreased once soil water content was below a lower (14.8 %) or above an upper (26.2 %) threshold. When soil water content ranged from 14.8 % to 26.2 %, soil respiration increased and correlated with soil temperature. Fine root also played a role in the significant differences in soil CO2 efflux among the three treatments. Furthermore, the three poplar hybrid clones responded differently to irrigation regarding fine root production and soil CO2 efflux. Conclusions: Irrigation intensity had a strong impact on soil respiration of the three poplar clone plantations, which was mainly because fine root biomass and microbial activities were greatly influenced by soil water conditions. Our results suggest that irrigation management is a main factor controlling soil carbon dynamics in forest plantation in arid regions. © 2013 Springer Science+Business Media Dordrecht. Source


Liu H.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2012

A misalignment rotor-bearing systems is studied as an object. Comparing two kinds of vibration characteristics of 0 torque excitation and linear torque excitation. The experimental data are analyzed by FFT and wavelet. Conclusion is obtained. Certain torque excitation can control oil whirl to a certain extent. On the other hand, linear torque excitation can increase degree of misalignment. Source


Qiao L.,Lanzhou University | Qiao L.,Taiyuan University of Technology | Zheng X.,Lanzhou University
Journal of Applied Physics | Year: 2013

Surface stress induced stiffness change of micro/nanocantilevers is reviewed and rigorously examined in this work. The self-equilibrium strain field of micro/nanocantilevers carrying an inherent surface stress on substrate is derived by resorting to the generalized Young-Laplace equation. It is found that the mechanism responsible for the observed stiffness change of micro/nano cantilevers originating from surface stress cannot be attributed to the development of in-plane stress near the clamp. Based on the analysis, two loading modes used in the mechanical test experiments performed on nanowire (NW) are theoretically investigated in detail: tension and electrically-induced- vibration. Lattice distortions arising from surface stress, coupled with that induced by residual strain, are shown to play a significant role in the elastic modulus measurement of NWs using an electric-field-induced vibrational mode, but have no influences on the tensile testing mode. The analytical results are validated by comparisons with molecular dynamic simulations and experimental measurements. The present results are useful in interpreting differences in observed size-dependent elasticity of NWs and developing the nano- and micro-mechanical testing techniques. © 2013 American Institute of Physics. Source


Li Y.,Taiyuan University of Technology | Li Y.,AGECON Ltd.
Bulletin of Engineering Geology and the Environment | Year: 2013

The effects of particle shape and size distribution on the constitutive behavior of composite soils with a wide range of particle size were investigated. Two comparable sets of specimens were prepared: (1) mixtures of fines (clay and silt) and an ideal coarse fraction (glass sand and beads), and (2) mixtures of fines and natural coarse fraction (river sand and crushed granite gravels). Direct shear box testing was undertaken on 34 samples and the structure of the shear surfaces, change in volume and water content and the particle shape coefficient of the sheared specimens were examined. The results indicate that the contraction/dilation a specimen exhibits is restrained within the shear zone while the outer zones remain unchanged during shearing. An increased coarse fraction leads to an increase in constant volume shear strength. In addition, increasing elongation or decreasing convexity of the coarse fraction increases the constant volume friction angle. The overall roughness of the shear surface at constant volume state is negatively related to particle smoothness (convexity) and positively related to the area of the shear surface occupied by particles with particular shapes. Two equations are proposed for the estimation of constant volume friction angle based on the proportion and shape coefficient of the coarse fraction. It is hoped this will assist in considering the shear strength of mixed soils when the size of the coarse fraction makes laboratory testing difficult. © 2013 Springer-Verlag Berlin Heidelberg. Source


Bao Z.Y.,Hong Kong Polytechnic University | Lei D.Y.,Hong Kong Polytechnic University | Jiang R.,Chinese University of Hong Kong | Liu X.,Hong Kong Polytechnic University | And 5 more authors.
Nanoscale | Year: 2014

Optical probes of heterogeneous catalytic reactions are of great importance for in situ determination of the catalytic activity and monitoring of the reaction process. Surface-enhanced Raman scattering (SERS) spectroscopy could be used as a sensitive optical probe for this purpose provided that plasmonic metal nanoparticles for Raman enhancement are properly integrated with catalytic metals to form a single entity. Herein we present a facile approach for synthesizing Au@Pt core-shell nanostructures with a controllable surface density of sub-5 nm Pt nanoparticles on the surface of Au nanorods. Systematic investigations on both SERS and catalytic activities of the hybrid nanostructures reveal an optimized surface coverage of Pt. More importantly, we demonstrate that, due to their dual functionalities, the hybrid nanostructures are able to track the Pt-catalysed reaction in real time by measuring the SERS signals of the reactant, intermediate and final products. This SERS-based synergy technique provides a novel approach for quantitatively studying catalytic chemical reaction processes and is suitable for many applications such as reduction and oxidation reactions in fuel cells and catalytic water splitting. This journal is © the Partner Organisations 2014. Source


Wang W.,Taiyuan University of Technology
International Journal of Heat and Mass Transfer | Year: 2015

Efficient turbine blade cooling structure design with high cooling effectiveness and low cooling loss is essential for improving the efficiency of turbomachines. This paper designs a new cooling structure combining external film cooling and internal convection cooling for a 1/2 scaled down gas turbine vane. The superheated steam replaces the traditional compressor air as coolant for the internal convective cooling. Wind tunnel experiments are conducted on a linear turbine cascade at exit Mach numbers of 0.9, and exit Reynolds number of 1.2 × 106, in order to study the cooling effectiveness of this cooling structure. Then the cooling entropy creation due to inevitable cooling losses (including internal friction and heat transfer losses and external heat transfer and mixing losses) of air cooling and steam cooling is estimated and discussed. It is found that, the cooling effectiveness of the test vane with newly designed cooling structure is high (approximately 0.8) and uniformly distributed. The entropy creation of external air cooling due to external mixing is higher than the heat transfer, and for the steam convective cooling, the entropy creation due to internal friction is much higher than heat transfer in the cooling process. © 2014 Elsevier Ltd. All rights reserved. Source


Teng K.,Taiyuan University of Technology | Zhang C.,Harbin Institute of Technology
Nonlinear Analysis: Real World Applications | Year: 2016

In this paper, under some superquadratic conditions made on the nonlinearity f, we use variational approaches to establish the existence of infinitely many solutions to quasilinear elliptic equations with (p,q)-Laplacian -Ⅎpu-Ⅎqu+a(x)|u|p-2u+b(x)|u|q-2u=f(x,u)in ℝ, where 1 Source


Zhai Y.-D.,Taiyuan University of Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Simplified roof bolted structure as a built-in beam acted by uniformly distributed load, the relationship between roof bolt pretension force and some factors was determined by analyzing the balance of the built-in beam, the pretension force was needed by roof bolted structure forming and the above factors include roadway roof pressure, physical property or mechanical property parameters of roof rock, effective length of bolt and bolt separation.Regarded side bolted structure as a body supporting roof bolted structure, the relationship between side bolt pretension force and some factors was determined by analyzing the relationship between confining stress and supporting ability of the supporting body, the side bolt pretension force was needed by side bolted structure forming and the factors above include roadway roof pressure, mechanical parameters of side rock, effective length of side bolt and the side bolt separation.The conclusion obtained was used when roadway support system was designed in No.15 seam of Datong mining area and achieved good result. Source


Shen J.,Swinburne University of Technology | Lu G.,Nanyang Technological University | Zhao L.,Taiyuan University of Technology | Qu Z.,Shanghai Institute of Technology
Journal of Performance of Constructed Facilities | Year: 2011

Curved sandwich panels with two aluminium face sheets and an aluminium foam core under air blast loadings were investigated experimentally and numerically. Specimens with two values of radius of curvature and different core/face sheet configurations with the same projected area were tested for three blast intensities. All four edges of the panels were fully clamped. The experiments were carried out by a four-cable ballistic pendulum with corresponding sensors. The impulse acting on the front face of the assembly, the deflection history at the center of the back face sheet, and the strain history at some characteristic points on the back face were obtained. Then the deformation/failure modes of specimens were classified and analyzed systematically. The commercial software LS-DYNA was employed to simulate those physical processes. The finite-element (FE) model was validated by the data from experiments. Detailed deformation and energy dissipation mechanisms were further revealed by the FE models. The valuable experimental data and results from FE models show that the initial curvature of a curved sandwich panel changes the deformation/collapse mode with an extended range for bending-dominated deformation mode, which suggests that the performance of the sandwich shell structures slightly exceeds that of both their equivalent solid counterpart and a flat sandwich plate in certain blast intensity ranges. © 2011 American Society of Civil Engineers. Source


Monodisperse rod-like colloidal core-shell-shell NaGdF4:Yb/Tm@NaGdF4:Ce/Ln@NaYF4 (Ln = Tb, Eu, Dy and Sm) nanoparticles (25 nm in diameter and 37 nm in length) have been successfully synthesized through a facile wet chemical method. X-ray diffraction, transmission electron microscopy, upconversion and down-shifting photoluminescence were used to characterize the samples. The prepared nanoparticles exhibited both tunable upconversion and down-shifting emissions from Tb, Eu, Dy and Sm activators under 980 nm near-infrared and 254 nm ultraviolet excitation, respectively. The dual-model luminescence was achieved through gadolinium (Gd3+) sublattice-mediated energy migration: Yb3+ → Tm3+→n(Gd3+) → Ln3+ and Ce3+ → n(Gd3+)→Ln3+ energy-transfer process, respectively. The advances on these dual-mode luminescent nanoparticles offer exciting opportunities for developing multifunctional optical nanoprobes for biological applications. © 2016 Elsevier Ltd. All rights reserved. Source


Qiao J.W.,Taiyuan University of Technology | Qiao J.W.,University of Science and Technology Beijing | Jia H.L.,University of Tennessee at Knoxville | Zhang Y.,University of Science and Technology Beijing | And 2 more authors.
Materials Chemistry and Physics | Year: 2012

Analysis of energy dissipation during shear-banding aids to understand plastic deformations of bulk metallic glasses (BMGs). For Zr 55Al 10Ni 5Cu 30 BMGs at 298 K, multi-step shearing is proposed, and the thermal energy during serrations cannot result in a temperature rise (ΔT) higher than T m. At 77 K, N-step shearing is supposed. When N is in the range of 24-47, it is reasonable to deduce the resulting temperature from 0.8T g to T m, accompanied by a continuous plastic deformation. Highlights: Multi-step shearing is reasonable to analyze energy conversion upon shear banding. At 77 K, the serrations disappear, and an N-step method is chosen to analyze the energy dissipation. The present investigation gives a proper method to reveal the shear banding for BMGs at different temperatures. © 2012 Published by Elsevier B.V. All rights reserved. Source


Sang L.,Taiyuan University of Technology | Jun C.,Shanxi University
International Journal of Digital Content Technology and its Applications | Year: 2011

Recently, several intrusion detection systems which utilized file integrity analyzers and mobile agent for intrusion detection and aimed to detection of malicious activity by insiders. But those systems have vulnerabilities in security aspect, due to there are malicious host, they should adopt special mechanism to protect agents and make sure they can accomplish their task even though there are a few malicious platforms. In this paper, we proposed a novel predicate encryption protection mechanism for insider intrusion detection system. Source


Zhang H.,Polytechnic University of Catalonia | Pera L.S.,Polytechnic University of Catalonia | Zhao Y.,Taiyuan University of Technology | Sanchez C.V.,Polytechnic University of Catalonia
Process Safety and Environmental Protection | Year: 2015

The mine disaster of gas at working face and goaf creates a risky working environment for miners, and causes a mass of casualties in mining industry around the world. The key points of resolving the gas problem are to properly increase fresh air volume in ventilation network, exactly determining the gas emission zone, and implementing a reasonable gas drainage plan. This article provides multiple gas control methods with the aim of improving the gas drainage knowledge and techniques. Both of the CFD model and the mini mine gas emission zone based on U + L type ventilation network are established, and the gas distribution and movement rules of working face and goaf are accurately obtained during the numerical and laboratorial simulation experiments are performed. The results reveal that gas problems at working face and goaf cannot be effectively resolved by only increasing the air volume; instead, it must be combined with optimizing the ventilation network and excavating special gas drainage tunnels. The experimental results also demonstrate that the most effective gas extraction spot constantly varies with the zone where mining activities are performed. Therefore, the arrangement of gas drainage tunnels is determined according to the obtained rules and experimental results. The field verification results show that the layout of the drilling boreholes is rational and effective; the gas drainage quantity is reliable and stable, which indicates that it is valid and feasible to arrange the layout of gas drilling tunnels based on the combination experimental results of numerical simulations and laboratory tests. © 2014 The Institution of Chemical Engineers. Source


Wang Y.,Taiyuan University of Technology
Advanced Science Letters | Year: 2012

With the increasing precision of signal processing system, the sensor signal pre-processing has become an important part of the control system. In this study, on the basis of the format conversion and pre-emphasis processing of collected sensors signal, the interference signal is removed by using FIR filtering algorithm and LMS filtering algorithm, and the signals feature are contrasted combined with wavelet energy coefficient analysis method after pretreatment. It concluded that the LMS filter algorithm is superior to FIR filter algorithm in the analysis of signal features difference. The pre-processing method achieved good results through the application of automatic detection system of sensor signal, and good results. © 2012 American Scientific Publishers. All Rights Reserved. Source


Wang H.,Taiyuan University of Technology | Lu S.,University of Science and Technology Beijing
Physicochemical Problems of Mineral Processing | Year: 2014

The effect of electron beam irradiation on magnetic property of iron bearing minerals was investigated by susceptibility measurements. The results show that the magnetic susceptibility of iron bearing sulfide minerals can be enhanced remarkably by strong beam current irradiation, while the magnetic susceptibility of oxidized iron minerals keeps unchanged and even is slightly reduced. The magnetic susceptibility of arsenopyrite can reach the ferromagnetic level. The particle size of irradiated minerals makes notable effects on magnetic susceptibility. The magnetic susceptibility of irradiated minerals is enhanced greatly with reduction of particle size, and the irradiation dose corresponding to the maximum magnetic susceptibility is decreased simultaneously. Exposure of pyrite to small beam current electron irradiation can only enhance its magnetic susceptibility from 4 to 5-fold. Enhancement of magnetic property by radiation induced defects and excitation in minerals is limited. Strong beam current electron irradiation provides a novel approach to enlarge the magnetic property differences between iron bearing minerals. Source


Ding J.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

A new type of activated carbon for flue gas desulfurization is obtained by carbonization of non-pitch based formed-coal and characterized by the BET method. The results indicate that the activated carbon with non-pitch binder has higher mechanical strength and sulfur absorptive capacity than the pitch-based activated carbon at adding the same quantity binder. When the addition of non-pitch binder reaches 15.0 wt. %, the activated carbon exhibits the optimum performance. The characterization result shows that the activated carbon with non-pitch binder presents a more developed micro-pore structure, more specific surface area and higher adsorption capacity. © (2013) Trans Tech Publications, Switzerland. Source


Sang L.,Taiyuan University of Technology
International Journal of Digital Content Technology and its Applications | Year: 2011

Authentication becomes an important part of network security, and biometrics is increasingly gaining popularity in security related applications. Remote server verifies the legitimacy of a user over an insecure communication channel in remote authentication. Recently, several biometric remote user authentication schemes with smart card were proposed, but they use biometric template or information as important authenticated factors and authenticate them in local side. It is limited in different applications. In this paper, we proposed a new attribute-policy handshake remote user authentication scheme which extends fuzzy biometric information authentication to satisfy different applications. Source


Sun H.,Beijing University of Chemical Technology | Sun H.,Taiyuan University of Technology | Qian C.,Beijing University of Chemical Technology
Applied Thermal Engineering | Year: 2013

In this study, heat transfer and flow resistance properties of large and small hole (LASH) baffle heat exchangers are studied with experimentally verified numerical models. Effects of the large hole diameters and baffle pitches are investigated. Results show that as a result of parallel flow, the shell-side pressure drops of the LASH baffle heat exchangers are greatly decreased compared with that of the conventional segmental baffle heat exchanger for the same baffle pitch. If the large hole diameter and baffle pitch are properly chosen, the LASH baffle heat exchanger presents a larger shell-side heat transfer coefficient and lower shell-side pressure drop. For the same shell-side pressure drop, the shell-side heat transfer coefficients of the LASH heat exchangers can be increased by as much as 25% compared with the conventional segmental baffle heat exchanger. © 2013 Elsevier Ltd. All rights reserved. Source


Li Y.R.,Taiyuan University of Technology | Li Y.R.,AGECON Ltd. | Wen B.P.,Water Resources University | Aydin A.,University of Mississippi | Ju N.P.,Chengdu University of Technology
Engineering Geology | Year: 2013

Reactivation of large-scale landslides along the reservoir banks of the Three Gorges Project (TGP) is recognized as the most likely form of geohazards threatening safety and operation of the dam and the navigation. This study presents an investigation into the naturally drained shear properties of slip zone soils of such landslides. Twenty-seven specimens of slip zone soils of three giant landslides are tested at three shearing rates (0.1, 1 and 10. mm/s) by means of a large ring shear apparatus accommodating abundant coarse particles in the specimens. It is observed that a) soils with higher plasticity index or liquid limit tend to have lower residual shear strength; this influence of the Atterberg limits on the residual shear strength weakens as the shearing rate increases; b) even small variations in the particle size distribution (. PSD) cause notable differences in shear properties. The PSD parameters, such as the coefficient of curvature, sand content, ratio of gravel content to the sum of remaining contents, and ratio of coarse fraction to fine fraction, have close correlations with the residual strength; and c) the residual strength is clearly affected positively by particle symmetry (quantified by elongation) and negatively by surface smoothness (quantified by convexity). © 2013 Elsevier B.V. Source


Ren L.,Shanxi Institute of Coal CAS Chemistry | Ren L.,University of Chinese Academy of Sciences | Yang J.,Shanxi Institute of Coal CAS Chemistry | Gao F.,Taiyuan University of Technology | Yan J.,Basic Research Service
Energy and Fuels | Year: 2013

The gasification reactivity of 13 carbonaceous materials in CO2 or in steam was studied in the temperature range 1000-1600 C. The gasification reaction was carried out in a drop-in-fixed-bed reactor under atmospheric pressure. The gasifying agent fed into the reactor either as pure gas or as 36% volumetric concentration in argon with a total gas flow rate of 500 mL/min. The test samples included different rank coals, petcokes, and graphites. The raw materials were used to eliminate the problem related to char prepreparation. The dynamic profiles of gasification rate were used to compare the gasification behaviors for different samples. The physicochemical characteristics of chars were evaluated by scanning electron microscopy and N2 adsorption method. The experimental results reveal that the difference in gasification reactivity among samples decreases as the temperature increases and is not distinguishable for most coals at 1600 C. However, the temperature is still critical for gasification of petcokes and some high-rank coals at high temperature. The gasification reactivity of petcokes is 2-9 times lower than that of coals at 1600 C. The kinetic analysis reveals that the temperature dependence of reactivity varies with the type of materials. It is interested to find that, in the temperature range 1400-1600 C, the gasification reactivity in CO2 is higher than that in steam for coals but not for petcokes. From the views of the reaction thermodynamics, the gas diffusion difficulty, and the catalytic effect, the high temperature is favorable to the CO 2-gasification. The effect of AAEMs (alkali and alkaline earth metals) should be a key factor. The content of AAEMs is apparent in coals but limited in petcokes. The Arrhenius plots reveal that the gasification mechanism may be altered around 1200 C for most of coals. The petcokes are appeared with the most compact physical structure and the least gasification reactivity. Either the shrinking core model (SCM) or the volume reaction model (VRM) is suitable for most of the samples and conditions but not suitable for the petcokes. A diffusion term associated with the carbon structure may be needed for modelling the gasification behaviors of the petcoke-like materials. © 2013 American Chemical Society. Source


Ventura M.,Free University of Bozen Bolzano | Zhang C.,Taiyuan University of Technology | Baldi E.,University of Bologna | Fornasier F.,Italian Agricultural Research Council | And 3 more authors.
European Journal of Soil Science | Year: 2014

Biochar addition to soil has been suggested as a promising strategy to increase soil carbon storage with important side-effects on soil fertility and crop productivity. Understanding the effect of biochar on soil respiration partitioning into rhizosphere-derived (Fr) and soil organic carbon-derived (Fsoc) components and on plant root dynamics and microbial activity is a crucial issue in the prediction of the impact of biochar on soil organic carbon and nutrient cycles. Within this framework, an experiment was carried out in an apple (Malus domestica Bork) orchard located in the experimental farm of the Bologna University (Italy). In spring 2009, 10t of biochar per hectare were incorporated into the surface 20-cm soil layer by soil ploughing. The trenching method was used in order to partition total soil respiration (Fs) into Fr and Fsoc components in both biochar-treated and control soil. Soil respiration measurements were performed from June 2009 to March 2011. To study root dynamics, polycarbonate boxes were built and buried into the soil. Soil profile pictures were collected fortnightly with a CCD sensor scanner inserted in the boxes and analysed with the WinRHIZO Tron MF software. Biochar addition increased Fsoc and reduced Fr, even if the root length intensity (La) increased in biochar-treated soils relative to that in the control. A decrease in root metabolic activity was postulated to explain these contrasting results. © 2013 British Society of Soil Science. Source


Wu J.,Taiyuan University of Technology
International Journal of Coal Science and Technology | Year: 2014

Accurate understanding the behavior of spiral rope is complicated due to their complex geometry and complex contact conditions between the wires. This study proposed the finite element models of spiral ropes subjected to tensile loads. The parametric equations developed in this paper were implemented for geometric modeling of ropes. The 3D geometric models with different twisting manner, equal diameters of wires were generated in details by using Pro/ENGINEER software. The results of the present finite element analysis were on an acceptable level of accuracy as compared with those of theoretical and experimental data. Further development is ongoing to analysis the equivalent stresses induced by twisting manner of cables. The twisting manner of wires was important to spiral ropes in the three wire layers and the outer twisting manner of wires should be contrary to that of the second layer, no matter what is the first twisting manner of wires. © 2014, The Author(s). Source


Liu Y.-L.,Taiyuan University of Technology
Wool Textile Journal | Year: 2014

This topic mainly reserch main performance for two kinds of yam 10 tex × 2 cashmere/ PVA(50/50) yarn and 10 tex × 2 wool/PVA ( 50/50 ) , including yam strength, elongation at break, yarn evenness, slub, nip, neps and hairiness, twist. These properties were tested and contrasted each other. Aimed at studying the effects of fiber raw material for yam quality and performancem, knowing the performance of the two kinds of yams, in order to give it more suitable for uses, give consumers a certain guiding. Then two plain cloths with the same specifications were woven by two yam respectively, separately to discuss air permeability, moisture permeability, beautiful comfort and a series of major performance of two fabrics, come to the conclusion by comparing the data. Studies have shown that air permeability,feel fuller, elastic, softness and comfort degree of the cashmere/PVA(50/50) plain fabric are better than those of wool /PVA ( 50/50) plain fabric. Moisture permeability of cashmere/PVA (50/50) plain fabric slightly lower than that of wool /PVA( 50/50) plain fabric. Source


Zhong C.,Ningbo University | Yue X.,Shanghai University | Zhang Z.,Taiyuan University of Technology | Lei J.,Shanghai University of Electric Power
Pattern Recognition | Year: 2015

Abstract The aim of clustering ensemble is to combine multiple base partitions into a robust, stable and accurate partition. One of the key problems of clustering ensemble is how to exploit the cluster structure information in each base partition. Evidence accumulation is an effective framework which can convert the base partitions into a co-association matrix. This matrix describes the frequency of a pair of points partitioned into the same cluster, but ignores some hidden information in the base partitions. In this paper, we reveal some of those information by refining the co-association matrix from data point and base cluster level. From the data point level, as pairs of points in the same base cluster may have varied similarities, their contributions to the co-association matrix can be different. From the cluster level, since the base clusters may have diversified qualities, the contribution of a base cluster as a whole can also be different from those of others. After being refined, the co-association matrix is transformed into a path-based similarity matrix so that more global information of the cluster structure is incorporated into the matrix. Finally, spectral clustering is applied to the matrix to generate the final clustering result. Experimental results on 8 synthetic and 8 real data sets demonstrate that the clustering ensemble based on the refined co-association matrix outperforms some state-of-the-art clustering ensemble schemes. © 2015 Elsevier Ltd. All rights reserved. Source


Li J.,Taiyuan University of Technology | Narita Y.,Hokkaido University
Composite Structures | Year: 2014

A design approach is presented for the multi-objective optimal design problem of aeroelastic laminated doubly curved shallow shells. The design objective is the maximization of weighted sum of the critical aerodynamic pressures under different probability density function of flow orientations. The design variable is the fiber orientations in the layers of the symmetrically angle-ply shells. Four typical probability density functions of flow orientations are considered. Hamilton's principle with the first-order shear deformation theory (FSDT) is used in the flutter analysis of supersonic doubly curved shallow shells. The multi-objective optimal design problem of symmetrical alternating angle-ply sequence [θ/-θ/θ/-θ]s and symmetrical arbitrary angle-ply sequence [θ1/θ2/θ3/θ4]s laminated shell structure are investigated. Finally, using a layerwise optimization approach (LOA), the optimal fiber orientation angles of supersonic laminated shells are determined to obtain the maximum design objective. © 2014 Elsevier Ltd. Source


Fei W.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2014

This paper take a reinforced concrete frame structures storey-adding transformation as an example, analysising and calculating the whole structure adding layer before and after, then discussing the reinforcing measures of the column during the design of this processing. The using condition shows that reinforcing measures is very safe and effective that the project has adopted, and it can serve as a reference for the design of similar projects. © (2014) Trans Tech Publications, Switzerland. Source


Ren H.L.,Beijing Institute of Technology | Shu X.F.,Taiyuan University of Technology | Ping L.I.,CAEP - China Academy of Engineering Physics
Science China: Physics, Mechanics and Astronomy | Year: 2010

Plate impact expeiments are conducted to investigate the dynamic behavior of alumina by using one stage light gas gun. A velocity interferometer system for reflectors (VISAR) is used to obtain Hugoniot elastic limit and the free surface velocity profile, which consists of an elastic wave followed immediately by a dispersive inelastic wave. The stress histories under different impact velocities are measured by in-material manganin gauges. Based on the experimental data a Hugoniot curve is fitted, which shows the compressive characteristics that alumina changes typically from elastic to "plastic", and under higher pressure it will be transferred to similar-fluid state. The turning point of the Hugoniot curve from a high pressure region to a low pressure region is about 11.4 GPa. The fracture process of alumina is simulated by way of finite element code. After the analysis of the fracture mechanism, the numerical results show an important role played by the nucleation and the growth of the cracks in the macroscopic fracture of the alumina target. The numerical predictions of stress histories are compared with the experimental results, which indicates consistency between them. © Science China Press and Springer-Verlag Berlin Heidelberg 2010. Source


Chen S.,City University of Hong Kong | Ho D.W.C.,City University of Hong Kong | Huang C.,Taiyuan University of Technology
IEEE Transactions on Industrial Electronics | Year: 2015

This paper presents two sets of estimator designs for distributed sensor networks in multitarget tracking under signal transmission faults due to the uncertain environments. A two-target tracking sensor network model is then established. Based on the tracking error systems, new augmented systems are proposed. It is proved that, using these systems, one can construct two different sets of estimators. The first estimation approach is to construct a fault estimator for the signal transmission faults occurred in the process of the two-target tracking in distributed sensor networks. The second estimation approach is to design a state/fault estimator. Alternatively, the second approach is proposed to design an estimator for both fault and state simultaneously in sensor networks tracking. Furthermore, the work can be extended to multitarget tracking problems in a more general setting. Finally, two application examples are used to illustrate the effectiveness of the theoretical results. © 2015 IEEE. Source


Main property of silk/cashmere siro-spun yarns and the cotton/cashmere ring-spun yarns were studied. The purpose of the present study was to explore the factors that influence on the yarns quality of siro spinning and traditional spinning technology and different fiber materials. Yarn evenness, strength, hairiness, twist, abrasion resistance were tested and contrasted each other. The result showed that the properties of silk/cashmere siro-spun yarns were superior to those of cotton/cashmere ring-spun yarns. 16.7 tex × 2 silk/cashmere 85/15 siro-spun yarns can be used more high-grade knitting fabric. According to the analysis, 16.7 tex × 2 silk/cashmere 85/15 siro-spun yarns sweater will be very popular among consumers in current textile market. Source


Zhou X.,Waseda University | Chen J.,Taiyuan University of Technology | Wu B.,Waseda University | Jin Q.,Waseda University
IEEE Transactions on Learning Technologies | Year: 2014

With the high development of social networks, collaborations in a socialized web-based learning environment has become increasing important, which means people can learn through interactions and collaborations in communities across social networks. In this study, in order to support the enhanced collaborative learning, two important factors, user behavior patterns and user correlations, are taken into account to facilitate the information and knowledge sharing in a task-oriented learning process. Following a hierarchical graph model for enhanced collaborative learning within a task-oriented learning process, which describes relations of learning actions, activities, sub-tasks and tasks in communities, the learning action pattern and Goal-driven Learning Group, as well as their formal definitions and related algorithms, are introduced to extract and analyze users' learning behaviors in both personal and cooperative ways. In addition, a User Networking Model, which is used to represent the dynamical user relationships, is proposed to calculate user correlations in accordance with their interactions in a social community. Based on these, an integrated mechanism is developed to utilize both user behavior patterns and user correlations for the recommendation of individualized learning actions. The system architecture is described finally, and the experiment results are presented and discussed to demonstrate the practicability and usefulness of our methods. © 2008-2011 IEEE. Source


Wang G.,Taiyuan University of Technology
Science China: Physics, Mechanics and Astronomy | Year: 2014

The van der Waals (vdW) interactions of carbon nanotube (CNT)-substrate and CNT-CNT can cause strong adhesion. The adhesion can lead to radial deformation of CNTs, which is shown in both experiments and theoretical analysis. A scaling approach is used to predict the mechanical properties, vdW adhesion, and the elastic deformation of CNTs. It is found that the indentation of CNT is proportional to R 7/4 and h -3/2 in nanotube-substrate system and two same CNT system. Here, R and h are the radius and the wall thickness of CNT, respectively. The indentation ratio H 1/H 2 for CNT-CNT is proportional to (R 1/R 2) 3/2 and (h 2/h 1)3/2. © 2014 Science China Press and Springer-Verlag Berlin Heidelberg. Source


Zhang G.,Taiyuan University of Technology
International Journal of Oil, Gas and Coal Technology | Year: 2015

Discarded biological oil was modified under various preparation conditions to produce coal flotation collectors to replace traditional petroleum flotation collectors. Effect of alcohol-oil molar ratio, catalyst dosage, reaction temperature and reaction time on clean coal yield was investigated. The results showed that the flotation collectors made from discarded biological had higher clean coal yield. Through orthogonal and single-factor tests, the best modified parameters were obtained, at a temperature of 50°C, an alcohol-oil molar ratio of 8:1, a potassium hydroxide (KOH) catalyst of 0.5% and a reaction time of 2.5 h. The alcohol-oil molar ratio and catalyst dosage were the most important factors to influence the performance of the flotation collectors. Under optimal conditions, the coal flotation collectors had higher clean coal yield than ordinary diesel oil or kerosene, and clean coal ash was also lower. Coal ash and clean coal yield were 7.93% and 58.54% under biological oil flotation collectors, while coal ash and clean coal yield were 8.29% and 57.65% under diesel flotation collectors. Copyright © 2015 Inderscience Enterprises Ltd. Source


Fangyu L.,Taiyuan University of Technology
Open Cybernetics and Systemics Journal | Year: 2014

Independent Component Analysis (ICA) is a kind of novel multi-dimensional statistical analysis method. Its characteristic is to recover the independent source signal components from the multi-channel observation signal. In this paper, based on the model of independent component analysis, we used the gradient style algorithm to separate the noise blind mixed electrical signal. In the application of gradient algorithm, in order to solve the compromise between convergence rate and stability performance of the natural gradient blind source separation algorithm, we adopted the variable step size natural gradient algorithm to complete the noise electrical signal on-line blind source separation simulation, which provides an effective method to realize the multi-sensor collection signal. © Liu Fangyu; Licensee Bentham Open. Source


Wang Y.S.,University of Science and Technology Beijing | Hao G.J.,University of Science and Technology Beijing | Qiao J.W.,Taiyuan University of Technology | Zhang Y.,University of Science and Technology Beijing | Lin J.P.,University of Science and Technology Beijing
Intermetallics | Year: 2014

The compression behaviors of Ti-based metallic glass matrix composites with dendrites scale were tested at different loading rates. It was found that the composites exhibited not only high strength, but also large plasticity under quasi-static compression. Under the dynamic loading, however, the TZ1 alloy with fine dendrites demonstrated a catastrophic failure. Although both the strength and plasticity decreased for the TZ2 composite sample with coarse dendrite, the total strain is over 7%. Discussions on the strain rates and dendrite scale are provided by analyzing the effects of dendrite, which can present the possible deformation mechanism of the composites. © 2014 Elsevier Ltd. All rights reserved. Source


Hou H.,North University of China | Wen Z.,North University of China | Zhao Y.,North University of China | Fu L.,North University of China | And 2 more authors.
Intermetallics | Year: 2014

The structural, elastic, thermodynamic and electronic properties of L1 2-ordered intermetallic compounds Ni3X (X = Al, Ga and Ge) under pressure range from 0 to 50 GPa with a step of 10 GPa have been investigated using first-principles method based on density functional theory (DFT). The calculated structural parameters of Ni3X at zero pressure and zero temperature are consistent with the experimental data. The results of bulk modulus B, shear modulus G, Young's modulus E, Poisson's ratio v, anisotropy index AU and Debye temperature ΘD increase with the increase of external pressure. In addition, the Debye temperature of these compounds gradually reduce as the order of Ni3Al > Ni3Ga > Ni3Ge. The ratio of shear modulus to bulk modulus G/B shows that the three binary compounds are ductile materials, and the ductility of Ni3Al and Ni3Ga can be improved with pressure going up, while Ni3Ge is opposite. Finally, the pressure-dependent behavior of density of states, Mulliken charge and bond length are analyzed to explore the physical origin of the pressure effect on the structural, elastic and thermodynamic properties of Ni3X. © 2013 Elsevier Ltd. All rights reserved. Source


Lv Y.,Taiyuan University of Technology
Metallurgical and Mining Industry | Year: 2015

Based on the system analysis on the structure and function of the mining environment social and economic system analysis, an indicator framework for geological environment assessment of single mine as constructed. With the involvement of combination weighting theory, Satty's Weighting method and Entropy Weight method was combined to compute the weight of each index. Furthermore, probability distribution function was employed to describe the probabilistic distribution characteristics of each index, and Monte Carlo method was used to propagate the influence of uncertainties of index on the regional geological quality of the environment. Ultimately, a MC-base method was constructed to evaluate the regional geological environment. The model was applied to assess the mine geological environment quality of two areas within the Ningxia Hui Autonomous. The results showed that: 1) the relative difference between the Monte Carlo-based method and the traditional method is 11%; being compared with traditional methods, the model can overcome the limit of measured data' discrete, and is able to fully characterize the regional geological environment quality; 2) Case studies show Zhongwei area's mine geological environment quality is worse than that of Guyuan area with more than 95% of the mine subject to serious or very serious damage level. It is therefore suggested that in making planning of environmental protection and mine geological environment restoration of, Zhongwei area should be paid more attention and placed in front of the sequence. © Metallurgical and Mining Industry, 2015. Source


Wu Y.-Y.,Hebei University of Technology | Li Y.-S.,Hebei University of Technology | Wei J.-W.,Taiyuan University of Technology | Li T.,East China University of Science and Technology
Gongcheng Lixue/Engineering Mechanics | Year: 2013

A subsection independently systematic integral method (SISIM for short) is proposed for solving bending deformation problem of statically indeterminate beam under complex load. In SISIM, the beam is separated into segments firstly, and then the approximate forth-order differential deflection equations are established independently. Finally the general solutions of beam deflection are obtained by forth-fold integration for each segment. Integral constants are determined by imposing boundary conditions and continuity conditions, thus analytical functions of shear force, bending moment, angle of rotation and deflection are obtained, as well as the shear force diagram, bending moment diagram, angle of rotation diagram and deflection diagram. The engineering example shows that setting equations by SISIM is simple to apply and convenient to be fulfilled by computer programming. Compared with the finite element method, the advantage of SISIM is that exact analytical solution can be obtained. Source


Bi G.Q.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2013

At present, there exist more and more adding storey building in China, the research on the reconstruction project is also increasing. There are no corresponding technical specifications to constraint the concrete that add steel structure to the concrete structure, this is a blank area. A hospital floor in Shanxi is on the basis of the original eight-story reinforced concrete shear wall, using steel reinforced concrete to transition, adding five-story steel frame-buckling support structure. Using the large-scale finite element analysis software ANSYS, this paper analyzes the increasing cross-section method of reinforced concrete column to obtain the stress-strain situation of the old and the new combination surface and the stress-strain before and after the column reinforcement, proposes design measures to resist the shear on the old and the new combination surface working together to reduce the stress-strain hysteresis effect. The results provide a reference for similar project. © (2013) Trans Tech Publications, Switzerland. Source


Wang Y.B.,Taiyuan University of Technology
Applied Mechanics and Materials | Year: 2014

A closed coal yard grid’s tructure is the shell and tube bolt ball grid, larger span, rise high higher, the highest point to ground is very high. This space truss’s construction method uses slice installation and aerial bulk construction method. Use Midas Gen 8.0 software to calculate and analyze the whole structure of the grid construction, simulate the construction process, calculate the rod deflection and stress values, the calculated results meet the regulatory requirements. This paper provide some reference for future similar projects. © (2014) Trans Tech Publications, Switzerland. Source


Wang Z.M.,Shanxi University | Xue H.B.,Taiyuan University of Technology | Xue N.T.,Shanxi University | Liang J.-Q.,Shanxi University
Annals of Physics | Year: 2015

We study the full counting statistics of transport electrons through a semiconductor two-level quantum dot with Rashba spin-orbit (SO) coupling, which acts as a nonabelian gauge field and thus induces the electron transition between two levels along with the spin flip. By means of the quantum master equation approach, shot noise and skewness are obtained at finite temperature with two-body Coulomb interaction. We particularly demonstrate the crucial effect of SO coupling on the super-Poissonian fluctuation of transport electrons, in terms of which the SO coupling can be probed by the zero-frequency cumulants. While the charge currents are not sensitive to the SO coupling. © 2014 Elsevier Inc.. Source


Cui Y.,Zhejiang University | Cui Y.,University of Illinois at Urbana - Champaign | Cui Y.,Taiyuan University of Technology | Fung K.H.,University of Illinois at Urbana - Champaign | And 8 more authors.
Nano Letters | Year: 2012

We present an ultrabroadband thin-film infrared absorber made of sawtoothed anisotropic metamaterial. Absorptivity of higher than 95% at normal incidence is supported in a wide range of frequencies, where the full absorption width at half-maximum is about 86%. Such property is retained well at a very wide range of incident angles too. Light of shorter wavelengths are harvested at upper parts of the sawteeth of smaller widths, while light of longer wavelengths are trapped at lower parts of larger tooth widths. This phenomenon is explained by the slowlight modes in anisotropic metamaterial waveguide. Our study can be applied in the field of designing photovoltaic devices and thermal emitters. © 2012 American Chemical Society. Source


Cheng J.,Dalian University of Technology | Zhang W.-Z.,Dalian University of Technology | Han Y.,Dalian University of Technology | Han Y.,Taiyuan University of Technology | Zhou L.,Dalian University of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

A maximal steady-state fermionic entanglement of a nanoelectronic system is generated in finite temperature non-Markovian environments. The fermionic entanglement dynamics is presented by connecting the exact solution of the system with an appropriate definition of fermionic entanglement. We prove that the two understandings of the dissipationless non-Markovian dynamics, namely, the bound state and the modified Laplace transformation, are completely equivalent. For comparison, the steady-state entanglement is also studied in the wide-band limit and Born-Markovian approximation. When the environments have a finite band structure, we find that the system presents various kinds of relaxation processes. The final states can be thermal or thermal-like states, quantum memory states, and oscillating quantum memory states. Our study provides an analytical way to explore the non-Markovian entanglement dynamics of identical fermions in a realistic setting, i.e., finite-temperature reservoirs with a cutoff spectrum. © 2015 American Physical Society. Source


Xie D.,Zhejiang Normal University | Su Q.,Taiyuan University of Technology | Dong Z.,Zhejiang Normal University | Zhang J.,Zhejiang Normal University | Du G.,Zhejiang Normal University
CrystEngComm | Year: 2013

Porous NiO hollow microspheres have been synthesized via a simple hydrothermal process using l-cysteine as a structure-directing agent followed by calcination. The as-synthesized NiO microspheres are hollow with diameters of 2-3 μm. The shells of the microspheres are built from nanoparticles with diameters of 30-50 nm, and the interior cavities are around 0.75 μm in diameter. A plausible mechanism has been proposed to explain the formation of the porous NiO hollow spheres. When evaluated as anode materials for lithium ion batteries, the porous NiO hollow microspheres show outstanding electrochemical performances, including high reversible capacity of 847.2 mAh g-1 after 50 cycles at 100 mA g-1, high rate capability with a discharge capacity of 470 mAh g-1 at a current density of 800 mA g -1, and good cycling stability. The excellent lithium-storage performance can be attributed to the porous hollow architectures, which provide fast ion/electron transfer and the structural flexibility for volume change during the cycling process. © 2013 The Royal Society of Chemistry. Source


Qi X.,Shanxi University | Hou J.,Taiyuan University of Technology
Quantum Information Processing | Year: 2015

The optimality of a class of entanglement witnesses constructed from any permutation $$\pi $$π for any $$n\otimes n$$n⊗n bipartite systems is investigated. A necessary and sufficient condition is presented for such entanglement witnesses to be optimal, and thus, a class of optimal entanglement witnesses constructed by permutations is obtained. © 2015, Springer Science+Business Media New York. Source


Ma J.,Taiyuan University of Technology | Ma J.,University of Texas at Dallas | Loizou P.C.,University of Texas at Dallas
Speech Communication | Year: 2011

Most of the existing intelligibility measures do not account for the distortions present in processed speech, such as those introduced by speech-enhancement algorithms. In the present study, we propose three new objective measures that can be used for prediction of intelligibility of processed (e.g.; via an enhancement algorithm) speech in noisy conditions. All three measures use a critical-band spectral representation of the clean and noise-suppressed signals and are based on the measurement of the SNR loss incurred in each critical band after the corrupted signal goes through a speech enhancement algorithm. The proposed measures are flexible in that they can provide different weights to the two types of spectral distortions introduced by enhancement algorithms, namely spectral attenuation and spectral amplification distortions. The proposed measures were evaluated with intelligibility scores obtained by normal-hearing listeners in 72 noisy conditions involving noise-suppressed speech (consonants and sentences) corrupted by four different maskers (car, babble, train and street interferences). Highest correlation (r = -0.85) with sentence recognition scores was obtained using a variant of the SNR loss measure that only included vowel/consonant transitions and weak consonant information. High correlation was maintained for all noise types, with a maximum correlation (r = -0.88) achieved in street noise conditions. © 2010 Elsevier B.V. All rights reserved. Source


Huang Z.W.,North University of China | Zhao Y.H.,North University of China | Hou H.,North University of China | Han P.D.,Taiyuan University of Technology
Physica B: Condensed Matter | Year: 2012

Electronic structures, elastic properties and thermal stabilities of Mg 17Al 12, Mg 2Si and Al 2Y have been determined from first-principle calculations. The calculated heats of formation and cohesive energies show that Al 2Y has the strongest alloying ability and structural stability. The brittle behavior and structural stability mechanism is also explained through the electronic structures of these intermetallic compounds. The elastic constants are calculated, the bulk moduli, shear moduli, Youngs moduli and Poisson ratio value are derived, the brittleness and plasticity of these phases are discussed. Gibbs free energy, Debye temperature and heat capacity are calculated and discussed. © 2012 Elsevier B.V. All rights reserved. Source


Xue H.-B.,Taiyuan University of Technology | Nie Y.-H.,Shanxi University | Chen J.,Shanghai University | Ren W.,Shanghai University
Annals of Physics | Year: 2015

We study theoretically the full counting statistics of electron transport through a quantum dot weakly coupled to two ferromagnetic leads, in which an effective nuclear-spin magnetic field originating from the configuration of nuclear spins is considered. We demonstrate that the quantum coherence between the two singly-occupied eigenstates and the spin polarization of two ferromagnetic leads play an important role in the formation of super-Poissonian noise. In particular, the orientation and magnitude of the effective field have a significant influence on the variations of the values of high-order cumulants, and the variations of the skewness and kurtosis values are more sensitive to the orientation and magnitude of the effective field than the shot noise. Thus, the high-order cumulants of transport current can be used to qualitatively extract information on the orientation and magnitude of the effective nuclear-spin magnetic field in a single quantum dot. © 2015 Elsevier Inc. Source


Garcia-Perez M.,Monash University | Garcia-Perez M.,Washington State University | Shen J.,Monash University | Shen J.,Taiyuan University of Technology | And 4 more authors.
Fuel Processing Technology | Year: 2010

This paper describes the production and fuel properties of fast pyrolysis oil/bio-diesel blends. The bio-oils used in this study were produced from the fast pyrolysis of woody biomasses, oil mallee and pine. The bio-diesel employed was derived from canola vegetable oil. The conditions used to prepare the bio-oil/bio-diesel blends, as well as some of the fuel properties of the resulting bio-diesel rich phase, are reported. The experimental results show that the solubility of fast pyrolysis oils in bio-diesel is not as high as was previously reported for decanted oils obtained by Auger pyrolysis. The carboxylic acids, mono-phenols, furans and lignin derived oligomers were the compounds most soluble in bio-diesel, while the sugars, on the other hand, showed poor solubility. Although the presence of phenols enhances the oxidation stability of the bio-diesel rich phases, other fuel properties deteriorate. For example, the content of solid residues increased primarily because of the solubilisation of lignin derived oligomers, which were quantified by UV-fluorescence. Concentrations as high as 3.5 mass % of these compounds were observed in the bio-diesel rich phase. The solubility of bio-oil in bio-diesel was enhanced by using ethyl acetate/bio-diesel blends. Some fuel properties of the bio-diesel rich phase, after the removal of ethyl acetate, are reported. © 2009 Elsevier B.V. All rights reserved. Source


Fang Z.-J.,South University of Science and Technology of China | Zheng S.-C.,South University of Science and Technology of China | Guo Z.,Taiyuan University of Technology | Guo J.-Y.,South University of Science and Technology of China | And 2 more authors.
Angewandte Chemie - International Edition | Year: 2015

The first Ni0/bis(oxazoline)-catalyzed asymmetric denitrogenative transannulation of 1,2,3-benzotriazin-4(3H)-ones with bulky internal alkynes to form novel axially chiral isoquinolones in an atroposelective manner has been developed. This method provides direct asymmetric access to axially chiral isoquinolones with excellent functional-group tolerance in excellent yields and stereoselectivities from readily available starting materials under mild reaction conditions. These axially chiral isoquinolones exhibit high cytotoxicity against a number of human cancer cell lines. DFT calculations reveal the nature of the transition state in the key annulation step. Getting the axe: Reported is the first enantioselective Ni0/bis(oxazoline)-catalyzed asymmetric transannulation of 1,2,3-benzotriazin-4(3H)-ones with internal alkynes in an atroposelective manner to form novel axially chiral isoquinolones. DFT calculations show data for the preferred transition state in the annulation step. The products show good cytotoxicity against cancer cell lines. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Ma N.,Taiyuan University of Technology | Ma N.,Xian Jiaotong University | Zhang S.,Xian Jiaotong University | Liu D.,Changzhou University | Wang V.,Xian University of Technology
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2014

Recent theoretical works have predicated the appearance of Weiss oscillations in the magnetoconductivity with a one-dimensional periodic electrical or magnetic modulation in graphene. This paper further explores the electrostatic field effect on the Weiss oscillations in the presence of crossed uniform in-plane electric field and perpendicular magnetic field that is weakly and periodically modulated along one direction. We find that the oscillation amplitude (OA) of Weiss oscillations and the value of conductivity are both shown to increase as the electric field E increases for a given magnetic field B. More interestingly, the electric field leads to an abrupt disappearance of the Weiss oscillations, when the value of electric to magnetic field ratio approaches a threshold value, i.e., γe = E/υFB = 1. These phenomena, not known in the conventional 2D electron gas, are a consequence of the anomalous spectrum of electron in graphene. © 2014 Elsevier B.V. All rights reserved. Source


Ai-yun L.,Taiyuan University of Technology
Advances in Information Sciences and Service Sciences | Year: 2012

The annual runoff forecasting of rank set pair analysis based on H(B' k, B' n+1) of rank set pair make analysis calculation of identity, difference and opposition and get the contact degree of μ B'i+B'n+1 of each set of pairs. Finally a connection degree or contact number of the maximum principle determine similar collection B' k of the B' n+1 and we select a number of similar collection, its subsequent value of the weighted average as the predictive value of the x n+1, therefore the prediction model was built. According to the nonlinear and the multi-time scale character of hydrological sequence, the establishment of hydrological forecast model is not high precision, Here we apply wavelet de-noising characteristics, and use 1929-1989 years of data of Fenhe reservoir Baxia station to establish wavelet de-noising RSPA model. Source


Lu Y.-B.,Southwest University of Science and Technology | Wu H.-J.,Beijing Institute of Technology | Zhao L.-M.,Taiyuan University of Technology
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2013

Dynamic splitting experiments on cement mortar specimens were performed to experimentally investigate the crack initiation and propagation under various loading rates. And a micro-mechanical model was developed to deeply analyze this problem. The results demonstrate that the micro-crack inertia is one of the mechanisms responsible for the increase of dynamic tensile strength with strain rate which can be observed in the dynamic tensile experiments on concrete-like materials. Source


Liang X.,Taiyuan University of Technology
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016

In a class trip, we happened to get acquainted with a centenarian at the west of the Yellow River—the Old Town of Wubu. The Old Town of Wubu awed us greatly with its vigorous and majestic momentum, and profound historical values are embedded in its dilapidated appearance that went through ages. Rammed earth walls, cave dwellings built with bricks as well as streets and roads built under the principle of “adjusting measures to local conditions” all show the wisdom and effort of ancient Chinese people. However, with transportation streamlines moving to the south, the Old Town of Wubu gradually lost its geographic advantages and was abandoned, leaving a “ghost town” standing in the rubble. How should the historical values of Wubu be re-evaluated? In addition, what should be done to protect the Old Town of Wubu?. © 2016 Taylor & Francis Group, London. Source


Ge L.,Taiyuan University of Technology
Advanced Materials Research | Year: 2014

During the process of grid structure lifting, the bearing capacity of some bars may overrun, because lifting point bears the main gravity of whole grid structure and the overall stress of grid structure changes [1]. Taking a steel grid structure lifting project as an example, this thesis analyzes the bearing capacity and stability of bars in the lifting process by MST software modeling. Besides, strengthening methods of bars are introduced. With the rapid development of national economy, the steel grid structure is more and more used in the production of all aspects. Project scale and complex structure system brings network frame integral hoisting process complexity and security problem [2]. With the MST software, the paper discusses the force of the space truss hoisting process, to ensure the safety of structures in the construction process to provide a reliable basis. © (2014) Trans Tech Publications, Switzerland. Source


Tao J.,Taiyuan University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

When the coal mine disaster happens, the communications system paralysis causes the fact that the stranded personnel and the rescue groups are unable to relate. This situation is the biggest difficult problem which the coal mine rescue work confronts. To establish an electromagnetic wave through-the-earth wireless communications system for coal mine, will give the trapped personnel more survival hopes. Through the analysis of transmittance rule of the very low frequency electromagnetic wave in the semi-conductive medium and the comparison between the electrical antenna and magnetic antenna, this article proposed a feasible implementation plan of the electromagnetic wave through-the-earth radio communications system for the coal mine disaster relief. © 2011 Springer-Verlag. Source


Teng K.,Taiyuan University of Technology
Nonlinear Analysis: Real World Applications | Year: 2015

In this paper we study the fractional Schrödinger type equations (-Δ)su+V(x)u=f(x,u),x ∈ ℝN. The nonlinearity f is assumed to be asymptotically linear or superquadratic growth. Using variant Fountain theorems, we prove the existence of infinitely many nontrivial high or small energy solutions. © 2014 Elsevier Ltd. All rights reserved. Source


Duan R.,Taiyuan University of Technology | Fedler C.B.,Texas Tech University
Journal of Irrigation and Drainage Engineering | Year: 2016

A few risks restrict the sustainable development of wastewater land application including potential nitrogen contamination to groundwater. One important component is nitrogen loss caused by denitrification in a nitrogen mass balance to control nitrogen leaching. Few field studies have been specifically conducted to investigate denitrification in wastewater land application systems. The objective of this study was to quantify denitrification at a wastewater land application site located in a semiarid area. The denitrification rate was measured within three soils at the City of Lubbock Land Application Site in three different months. One-way ANOVA and a t-test were used to compare the differences of averages of many groups of data and of two groups of data at the p < 0.05 level, respectively. If ANOVA or the t-test is not applicable, the Kruskal-Wallis one-way analysis of variance on ranks and the Mann-Whitney rank sum test were employed to compare the differences of medians of many groups of data and of two groups of data at the p < 0.05 level, respectively. The denitrification rate in January was as high as 210 g N2O-N/ha/day, while soil moisture was 19.4%. The denitrification rate ranged from 0.5 to 2,229.2 g N2O-N/ha/day, which were the results of combined effects of environmental variables. Further and more detailed field investigation and quantification of denitrification are required in order for advanced nitrogen mass balance and sustainable nitrogen management at a wastewater land application site. © 2015 American Society of Civil Engineers. Source


Hou Y.,Taiyuan University of Technology | Hou Y.,Tohoku University | Chen L.,Tohoku University | Liu P.,Tohoku University | And 5 more authors.
Journal of Materials Chemistry A | Year: 2014

We report a flexible asymmetric supercapacitor assembled by polypyrrole (PPy) and manganese oxide supported by ultrathin three-dimensional nanoporous gold (NPG) electrodes. The highly conductive and free-standing NPG films act as both supports of the active materials and current collectors of the supercapacitor, which evidently enhance the specific capacitance of active materials of both the conducting polymer and the metal oxide. The high energy density and high power density can be realized from the PPy-NPG//MnO 2-NPG asymmetric supercapacitor because of the wide cell voltage in an aqueous electrolyte and high specific capacitances of both PPy and MnO 2 enhanced by NPG. This journal is © the Partner Organisations 2014. Source


Xu Q.,Taiyuan University of Technology | Guo J.-Y.,Anhui University
International Journal of Modern Physics E | Year: 2012

Spin breaking for the resonant states in 208Pb is investigated by solving the Dirac equation with Woods-Saxon vector and scalar potentials in combination with an analytic continuation in the coupling constant method, where the stable and convergent energies and widths are obtained. Spin breaking are shown in correlation with the nuclear mean field shaped by the central depth Σ0, a radius (range) R and a diffusivity a, which play an important role in the splittings of energy and width. The energy-level crossings appear in several spin partners of resonant states, where the decay time is found to be different for the spin doublets even when their energies are fully degenerate. © 2012 World Scientific Publishing Company. Source


Wang P.,Taiyuan University of Technology | Wang P.,Nanyang Technological University | Gao Z.,Nanyang Technological University | Bertling L.,Chalmers University of Technology
IEEE Transactions on Power Systems | Year: 2012

In a power system with high renewable power penetration, uncertain and intermittent characteristics of renewable energy resources become major concerns of system planning and operation. In such a power system, conventional thermal or hydro units have to be dispatched, shut down or started up more frequently to incorporate load, renewable resource variation and system failures. Slow ramp up (or down) of conventional units may cause energy shortage (or surplus) in power systems with high wind power penetration or in isolated micro grids with limited dispatchable capacity. This paper proposes a technique to evaluate operational reliability and energy utilization efficiency of power systems with high wind power penetration. The ramp rate of a conventional generator and energy storage system (ESS) are considered in the proposed technique. The effect of slow ramp-up rate or fast reduction of wind speed on system reliability is measured by the expected energy not supplied. A new index designated as the expected energy not used is proposed and formulated to represent energy surplus due to fast increase of wind speed and slow ramp down of conventional units. The IEEE-RTS is used to illustrate the applications of the proposed method. © 1969-2012 IEEE. Source


Sheng Y.,Australian National University | Kong Q.,Shanghai University | Wang W.,Taiyuan University of Technology | Kalinowski K.,Australian National University | Krolikowski W.,Australian National University
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2012

We theoretically study the second-harmonic generation via nonlinear Raman-Nath diffraction in an optical medium with the spatial modulation of quadratic nonlinearity. We derive analytical equations that govern the emission properties of this nonlinear wave phenomenon. We also discuss how a substantial range of parameters such as the thickness of a nonlinear medium and the condition of a pump laser affect the strength of the emitted harmonic signals. © 2012 IOP Publishing Ltd. Source


Wang X.,Shandong University | Wang X.,Taiyuan University of Technology | Wang W.,Shandong University | Qi Z.,Shandong University | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2012

A novel Raney-like nanoporous Pd catalyst has been fabricated through the combination of ball-milling with alkali-dealloying strategy. The microstructure of this catalyst has been characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that the as-fabricated Raney Pd powders are several microns in size, and each particle exhibits an open, bicontinuous interpenetrating ligament-channel structure with a length scale of 3-7 nm. Electrochemical measurements demonstrate that this Raney Pd catalyst has a high electrochemical active surface area and shows remarkable electrocatalytic activity and stability towards ethanol oxidation. Due to the advantages of simple preparation and superior performance, this Raney Pd catalyst can find promising application as a candidate for the anode catalyst of direct ethanol fuel cells. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Shen J.,Taiyuan University of Technology
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2012

The blends of two weakly-caking coals (D1 and D2) with a fat coal or petroleum pitch or coal tar pitch in different proportions were co-carbonized at 3C/min up to 1000C in an experimental 1-Kg coke oven. Coke particulate size, micro-strength, and crushing strength were measured, respectively. Optical textures were watched under a polarized microscope. It was shown that, except for coke yield, blends with coal tar pitch had the best coke micro-strength, cracking strength, and >0.8 mm coke lump yield. Fat coal produced fine-grained mosaics, and weakly-caking coals were mainly fusinite and fragments. Petroleum pitch was coarse-grained mosaics, and coal tar pitch was chiefly flow or domain textures. Independent optical textures were observed in cokes. There existed evident borders between the two contact optical textures that were produced by different components, and a few phenomena that domain or flow textures penetrating into fusinite appeared in the blends. It seemed that coal tar pitch was the best for blending with weakly-caking coal for producing high quality cokes. © 2012 Taylor and Francis Group, LLC. Source


Tang Y.,Taiyuan University of Technology
Combustion Science and Technology | Year: 2016

As a fossil fuel, oil shale is universally regarded as an unconventional resource with huge value. In this study, we conducted a low-temperature oxidation experiment to evaluate the combustion characteristics of oil shale. Our results show that the oil shale (FS oil shale) in Fushun, China, generates gaseous products, such as CO, CO2, CH4, C2H4, and H2 at 60°C, which might be due to the oxidative decomposition of the aliphatic hydrocarbon and the oxygen functional group in oil shale. With the increase of temperature, the contents of –CH2– increased, whereas those of C–O increased first and then decreased. Results of thermogravimetric analysis indicated that the smaller particle size had lower critical temperature, and thus, there is only smaller activation energy for oxidation, consequently increasing the susceptibility of samples to spontaneous combustion. In addition, the phytate efficiently inhibited the low-temperature oxidation of oil shale. © 2016 Taylor & Francis. Source


Zhang Z.,Taiyuan University of Technology
Molecular Physics | Year: 2011

A molecular dynamics simulation study of a brown coal matrix with a moisture content ranging from 0 to 60% was performed to examine the structure and dynamics of the coal-water system. The simulations show that the brown coal matrix shrinks during the drying process. The water molecules prefer to interact with hydrophilic oxygen moieties. During the drying process, the removal of water occurs successively from the outer hydration shell to the inner hydration shell around the oxygen moieties. The translational and rotational mobilities of water are found to be slower with the decrease of moisture content and in the proximity of carboxyl and carbonyl groups. © 2011 Taylor & Francis. Source


Sun S.,Peking University | Niu Y.,Peking University | Niu Y.,Taiyuan University of Technology | Sun Z.,Peking University | And 2 more authors.
RSC Advances | Year: 2015

Solubilities of SO2 in ethylene glycol derivatives were determined by dynamic isothermal gas-liquid equilibrium (GLE) experiments, and the thermodynamic parameters of the absorption processes were calculated. The GLE results indicated that the solubilities of SO2 in ethylene glycol derivatives increase in the order: diols < monomethyl ethers < dimethyl ethers, with the enthalpy values ranging from -23.2 to -43.3 kJ mol-1. The regeneration experiment found that the absorption of SO2 in tetraethylene glycol dimethyl ether is reversible, and the solvents can be reused without a significant loss of absorption capacity. The interactions between SO2 and ethylene glycol derivatives were investigated by UV, IR and NMR. In addition, a 1H-NMR spectroscopy technique with external references was used to investigate the physical absorption process of SO2 for the first time, in order to avoid the influence of deuterated solvents. Spectroscopic investigations showed that the interactions between SO2 and ethylene glycol derivatives are based on both the charge-transfer interaction and hydrogen bond. Ethylene glycol derivatives with desirable absorption capacities and excellent regeneration abilities are promising alternatives to conventional sorbents in SO2 separation. © The Royal Society of Chemistry 2015. Source


Fu T.,Taiyuan University of Technology | Li Z.,Tianjin University of Technology
Chemical Engineering Science | Year: 2015

Diminishing petroleum reserves, sharp fluctuations of crude oil prices, increasingly stringent environmental regulations and the global demand for a decreased dependence on petroleum for the production of fuels and chemicals, are the main driving force for the recent renewed interest in Fischer-Tropsch (FT) synthesis in academia and industry. Cobalt catalyst is the preferred catalyst for the production of long-chain paraffins because of its high activity, low water-gas shift activity and comparatively low price. Carbon materials including traditional activated carbons, carbon nanotubes and nanofibres, carbon spheres and mesoporous carbons have been used as the support for cobalt catalyst in the past 10 years for its inert property. The microstructures (e.g., carbon porosity, cobalt particle size, cobalt location and cobalt dispersion) of these carbon supported cobalt catalyst determine the CO conversion and product selectivity. In this paper, we focus on the most recent developments around carbon support structure effect, cobalt intrinsic properties and promoter effect on carbon supported cobalt catalyst for FT synthesis. The nitrogen doping effect, confinement effect and cobalt particle size effect on carbon nanotubes supported Co catalysts are further presented in this review. © 2015 Elsevier Ltd. All rights reserved. Source


Hu C.,University of Hong Kong | Ting S.-W.,University of Hong Kong | Chan K.-Y.,University of Hong Kong | Huang W.,Taiyuan University of Technology
International Journal of Hydrogen Energy | Year: 2012

Formic acid decomposition on noble metals is considered to be a potential method to produce CO-free hydrogen at near ambient temperatures. However, the reaction mechanism, as well as the key points, for HCOOH decomposition on noble metals in aqueous solution remains unclear at microscopic level. In the present work, we employed density functional theory (DFT) calculation to investigate HCOOH decomposition in gas and aqueous phases on four common noble metals (Pt, Pd, Rh, and Au). Based on the present theoretical calculation results and experimental results being available in literature, two reaction pathways were proposed to understand gas- and aqueous-phase HCOOH decomposition on the noble metals. The key points that determine the activities of the metals toward HCOOH decomposition into CO2 and H2 in aqueous solution are clarified. Furthermore, the proposed reaction mechanism can be well extended to interpret the excellent activity of Ag-Pd core-shell bimetallic catalyst for HCOOH decomposition in aqueous solution. It is expected the present reaction mechanisms would enable us to rationally design more active heterogeneous catalysts for HCOOH decomposition into CO-free H2 at relatively low temperatures. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Muchao L.,Taiyuan University of Technology
Advances in Intelligent Systems and Computing | Year: 2014

In this paper, we present a data processing approach for Laser induced breakdown spectroscopy (LIBS). This method is based on wavelet analysis and pattern matching. First, it uses wavelet transforms to decompose the laser induced spectrum data which comes from the sample and obtain the decomposition coefficient of spectrum, then reconstructs the feature background spectrum by means of low frequency coefficient. Through using pattern cluster method to divide the spectrum data of calibration sample into some subsets, then do the calibration for each spectra data in each subsets. Second, we extract effective measurement pattern class template and calibration parameter from the spectrum subset which has the minimum differ between the result of calibration sample and the reality value. In practical process of measurement, we use effective measurement pattern class template to match the spectra data to identify the effectiveness of the measurement. Therefore, we can calculate element contents with the calibration parameter achieved before. This method can decrease the times of laser excitation and increase the measurement accuracy effectively. © Springer International Publishing Switzerland 2014. Source


Wang H.-T.,Taiyuan University of Technology
Xiandai Huagong/Modern Chemical Industry | Year: 2014

Coking wastewater is oxidized in supercritical water using H2O2 as a oxidant and Cu(NO3)2, Fe(NO3)2 and Mn(NO3)2 as catalysts in a packed-bed flow reactor. The effects of the catalyst concentration, reaction pressure on degradation efficiency of COD and NH4-N are investigated. The mechanism of catalytic supercritical water oxidation (CSCWO) is revealed. The results indicate that in supercritical water, the efficiency of removing COD and NH4-N is much better after adding metal ions such as Fe(NO3)2 and Mn(NO3)2 catalysts. Source


Lv Z.,Taiyuan University of Technology
Engineering Technology, Engineering Education and Engineering Management - International Conference on Engineering Technology, Engineering Education and Engineering Management, ETEEEM 2014 | Year: 2015

Art decorative can make landscape more beautiful in urban public space. Art decorative design reflects the characteristics of the environment, history and culture of a city and a state of the spirit of the times. Modern art deco design should not only have its own style, but also be more perfectly reflect the cultural connotation of specific urban environment, and to create a pleasant living environment for human being. Aesthetic concepts of decorating space environment are inseparable from the people’s view of decoration. Analyzing from the sensory effects and psychological effects of decorative environment, the paper points out the way for environmental decoration development, and provide ideas for future creative decoration. © 2015 Taylor & Francis Group, London. Source


Li J.,Taiyuan University of Technology | Li J.,Hokkaido University | Narita Y.,Hokkaido University
Composite Structures | Year: 2013

The present paper is concerned with the vibration of supersonic laminated plates with general edge conditions. The critical aerodynamic pressure for different types of laminated plate is studied by considering the thermal effects. It is found from the numerical results that, with the increase of aerodynamic pressure for different edge conditions of supersonic plates, the first critical flutter modes are different and in some cases with the increase of aerodynamic pressure the buckling occurs before the flutter. Using a layerwise optimization approach (LOA), the optimal fiber orientation angles of supersonic laminated plate are determined to obtain the maximum critical aerodynamic pressure. It clearly demonstrated that through the optimization process, one can largely raise the critical aerodynamic pressure and significantly improve the stability of supersonic plates. © 2013 Elsevier Ltd. Source


Wang R.,Taiyuan University of Technology | Wang R.,Tsinghua University | Han L.-H.,Tsinghua University | Hou C.-C.,Tsinghua University
Journal of Constructional Steel Research | Year: 2013

This paper reports an investigation into the impact performance of concrete filled steel tubular (CFST) members. A series of tests were carried out to obtain the failure modes and the time history of the impact forces for the composite components under lateral impact. The testing parameters include the axial load level on CFST specimens, constraining factor and the impact energy. A finite element analysis (FEA) model was developed, in which the strain rate effects of steel and concrete materials, interaction between the steel tube and the core concrete, as well as the confinement effect of the outer steel tube provided to the core concrete were considered. The test data were then used to verify the accuracy of the FEA model and generally a good agreement was achieved. A full-range analysis on the impact behavior of CFST member was performed by using the FEA model. © 2012 Elsevier Ltd. All rights reserved. Source


Ouyang T.,Xiangtan University | Chen Y.,Xiangtan University | Xie Y.,Xiangtan University | Wei X.L.,Xiangtan University | And 3 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

Graphene nanojunctions (GNJs) are important components of future nanodevices and nanocircuits. Using the nonequilibrium Green's function method, we investigate the phononic properties of three-terminal GNJs (TGNJs). The results show that the heat flux runs preferentially along the direction from narrow to wide terminals, presenting an evident ballistic thermal rectification effect in the asymmetric TGNJs. The rectification efficiency is strongly dependent on the asymmetry of the nanojunctions, which increases rapidly with the width discrepancy between the left and right terminals. Meanwhile, the corner form of the TGNJs also plays an important role in the rectification effect. The mechanism of this thermal rectification is explained by a qualitative analysis. Compared to previous thermal rectifiers based on other materials, the asymmetric nanojunctions based on graphene possess much high rectification ratio which can approach about 200%. These indicate that asymmetric TGNJs might be a promising candidate for excellent ballistic thermal (phononic) devices. © 2010 The American Physical Society. Source


Huang J.,University of Electronic Science and Technology of China | Wang P.,Taiyuan University of Technology | Wang P.,Nanyang Technological University | Wan Q.,University of Electronic Science and Technology of China
IEEE Communications Letters | Year: 2012

Collaborative beamforming (CB) has been widely used in a wireless sensor network (WSN) to improve the directivity of signals in long-distance transmission. CB performance has been analyzed for some specific node distributions such as Uniform and Gaussian distributions. However, the results obtained based on a particular distribution for a WSN under a specific condition may not be true for other WSNs under different conditions. This letter proposes a novel unified method to evaluate CB performance for various node distributions. The simulation results verify the proposed method. © 2012 IEEE. Source


Cui Y.,University of Illinois at Urbana - Champaign | Cui Y.,Zhejiang University | Cui Y.,Taiyuan University of Technology | Xu J.,University of Illinois at Urbana - Champaign | And 5 more authors.
Applied Physics Letters | Year: 2011

We experimentally demonstrate an infrared broadband absorber based on an array of nanostrip antennas of several different sizes. The broadband property is due to the collective effect of magnetic responses excited by these nanoantennas at distinct wavelengths. By manipulating the differences of the nanostrip widths, the measured spectra clearly validate our design for the purpose of broadening the absorption band. © 2011 American Institute of Physics. Source


Lv Z.,Taiyuan University of Technology
Engineering Technology and Applications - Proceedings of the 2014 International Conference on Engineering Technology and Applications, ICETA 2014 | Year: 2014

Coal mine accidents are generally associated with the ventilation system used. Cloud computing k-unth algorithm has brought about major changes in the multi-variable prediction structure of coal mine underground ventilation capacity. This paper discusses the use of cloud computing k-unth algorithm for the detection of coal mine underground ventilation capacity and a spatial data fusion approach as well as a cloud computing information aggregation technique and four-dimensional nonlinear indexing for newly developed intelligent ventilation networks are discussed. With options for dynamic modifications of R+tree, the minimum k-unth algorithm prediction error is used to determine the optimal embedding dimension. Prediction customer error is used to predict wind waveform flicker and ventilation diagonal branch unbalance. © 2014 Taylor & Francis Group. Source


Zhang Y.,Taiyuan University of Technology
Advanced Materials Research | Year: 2013

DongYue Temple is an important part of Jin Memorial Temple, which has immeasurable cultural value. It is the indispensable supplement of various architecture artistic forms in Jin Memorial Temple. From the angle of the description of the hall buildings and murals, this article analyses the historical value, scientific value and aesthetic archaeological value of DongYue Temple. And fully reflects the Jin Memorial Temple is a rare ancient architectural complex, with the diversity of historical and cultural characteristics. © (2013) Trans Tech Publications, Switzerland. Source