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Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

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Rare Metals 2024年第4期43卷 1758-1768页

作者： Cun-Cheng Li ming-wei zhang Ji-Wu Xin Lei wei Wen-Yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

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Evaluation of the correlation between ammonia nitrogen and p-toluidine using sequencing batch reactor treating synthetic p-toluidine wastewater

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Journal of Environmental Sciences 2006年第2期18卷 259-262页

作者： zhang Bo CHEN Jin-long WANG Fan zhang wei-ming zhang Quan-xing Department of Environmental Engineering Nanjing University Nanjing 210093 China

This paper presents lab-scale experiment carried out to evaluate the correlation between ammonia nitrogen （NH3-N） and p-toluidine using sequencing batch reactor treating synthetic p-toluidine wastewater. The profiles of NH3-N and p-toluidine were traced under the concentration of sucrose in the influent varied from 0 to 500 mg/L, aerated airflow varied from 0.6 to 1.2 L/min and temperature varied from 10 to 25℃, respectively. The results showed that the concentration of NH3-N turned from increase to decrease when p-toluidine was nearly completely biodegraded, so the profile of NH3-N could clearly indicate the endpoint of p-toluidine biodegradation. And the profile of NH3-N was not influenced by the sucrose in the influent, aerated airflow and temperature. It is showed that using ammonia nitrogen as monitoring and control parameter is feasible and reliable and has promising application in amine wastewater treatment by SBR.

关键词： sequencing batch reactor correlation ammonia nitrogen p-toluidine biodegradation

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Numerical simulation of 3D-microstructures in solidification processes based on the CAFE method

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 640-645页

作者： Jin-long Wang Fu-ming Wang Yan-yu Zhao Jiong-ming zhang wei Ren School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

It was analyzed that the finite element-cellular automaton （CAFE） method was used to simulate 3D-microstructures in solidification processes. Based on this method, the 3D-microstructure of 9SMn28 free-cutting steel was simulated in solidification processes and the simulation results are consistent with the experimental ones. In addition, the effects of Gaussian distribution parameters were also studied. The simulation results show that the higher the mean undercooling, the larger the columnar dendrite zones, and the larger the maximum nucleation density, the smaller the size of grains. The larger the standard deviation, the less the number of minimum grains is. However, the uniformity degree decreases first, and then increases gradually.

关键词： finite element-cellular automaton model numerical simulation solidification 3D-microstructure Gaussian distribution parameters

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Critical review in adsorption kinetic models

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 716-724页

作者： Hui QIU Lu LV Bing-cai PAN Qing-jian zhang wei-ming zhang Quan-xing zhang State Key Laboratory of Pollution Control and Resource Reuse Department of Environmental Engineering School of the Environment Nanjing University Nanjing 210093 China

Adsorption is one of the most widely applied techniques for environmental remediation. Its kinetics are of great significance to evaluate the performance of a given adsorbent and gain insight into the underlying mechanisms. There are lots of references available concerning adsorption kinetics, and several mathematic models have been developed to describe adsorption reaction and diffusion processes. However, these models were frequently employed to fit the kinetic data in an unsuitable or improper manner. This is mainly because the boundary conditions of the associated models were, to a considerable extent, ignored for data modeling. Here we reviewed several widely-used adsorption kinetic models and paid more attention to their boundary conditions. We believe that the review is of certain significance and improvement for adsorption kinetic modeling.

关键词： Adsorption kinetics Reaction models Diffusion models Film diffusion Intraparticle diffusion

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Item Cold-Start Recommendation with Personalized Feature Selection

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Journal of Computer Science & Technology 2020年第5期35卷 1217-1230页

作者： Yi-Fan Chen Xiang Zhao Jin-Yuan Liu Bin Ge wei-ming zhang Science and Technology on Information Systems Engineering Laboratory National University of Defense TechnologyChangsha 410073China Academy of Military Sciences Beijing 100091China

The problem of recommending new items to users(often referred to as item cold-start recommendation)remains a challenge due to the absence of users’past preferences for these *** features from side information are typically leveraged to tackle the *** methods formulate regression methods,taking item features as input and user ratings as *** methods are confronted with the issue of overfitting when item features are high-dimensional,which greatly impedes the recommendation *** of high-dimensional item features,in this work,we opt for feature selection to solve the problem of recommending top-N new *** feature selection methods find a common set of features for all users,which fails to differentiate users1 preferences over item *** personalize feature selection,we propose to select item features discriminately for different *** study the personalization of feature selection at the level of the user or user *** fulfill the task by proposing two embedded feature selection *** process of personalized feature selection filters out the dimensions that are irrelevant to recommendations or unappealing to *** results on real-life datasets with high-dimensional side information reveal that the proposed method is effective in singling out features that are crucial to top-N recommendation and hence improving performance.

关键词： high-dimensionality item cold-start top-TV recommendation personalized feature selection

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Multiplicity dependence of charged particle,? meson, and multistrange particle productions in p + p collisions at s^(1/2) = 200 GeV from PYTHIA simulation

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Nuclear Science and Techniques 2018年第9期29卷 236-241页

作者： Sheng-Hui zhang Long Zhou Yi-Fei zhang ming-wei zhang Cheng Li ming Shao Yong-Jie Sun Ze-Bo Tang University of Science and Technology of China Hefei 230026China

We report the multiplicity dependence of charged particle production for the n~±, K~±, p, , and ? mesons at |y|<1:0 in p + p collisions at s^(1/2) = 200 GeV from a PYTHIA simulation. The impact of multiple parton interactions and gluon contributions is studied and found to be a possible source of the splitting of the particle yields as a function of p_T with respect to the multiplicity. No obvious particle species dependence of the splitting is *** multiplicity dependence of the ratios Kˉ/πˉ, K^+/π^+,/πˉ, p/π^+, and K_s^0 at mid-rapidity in p+ p collisions is found to follow a tendency similar to that in Au t Au collisions at (s_(NN))^(1/2) = 200 GeV at the Relativistic Heavy Ion Collider, indicating similar underlying initial production mechanisms despite the differences in the initial colliding systems.

关键词： Particle production Heavy-ion collisions Small system Multiple parton interactions Gluon contributions

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A displacement sensor of dual-light based on FPGA

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Optoelectronics Letters 2007年第4期3卷 294-298页

作者： HE ming-xia zhang wei-na zhang Xu StateKeyLaboratoryofprecisionMeasurementTechnology and Instruments Tianjin UniversityTianjin300072China

The dual-light displacement sensor is presented to obtain a higher accuracy compared with the single. The structure and principle of the system are also introduced, and the hardware and software are brought in too. Th... 详细信息

关键词：位移传感器对偶光 FPGA 数据处理

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Beneficiation of Titanium Oxides From Ilmenite by Self-Reduction of Coal Bearing Pellets

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Journal of Iron and Steel Research International 2006年第2期13卷 6-9页

作者： XU Meng GUO ming-wei zhang Jian-liang WAN Tian-ji KONG Ling-tan School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The study on the beneficiation of titanium oxides from Panzhihua ilmenites by reduction of coal bearing pellets was carried out. The iron oxides in pellets were efficiently reduced to metal iron, and titanium oxide slag beneficiated was separated from metal iron. The effect of temperature, flux and coal blending ratio on the reduction and separation was investigated, and rational parameters were determined. A new process for the beneficiation of titanium oxides by rotary hearth furnace （RHF） was proposed.

关键词： ilmenite pyrometallurgy reduction separation titaniferous slag coal bearing pellet

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Sythesis, Characterization and Catalysis of [ η~5,η~1-C_5H_4-CHPh-PhO]TiCl_2

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Chemical Research in Chinese Universities 2001年第1期17卷 115-116页

作者： WANG Jian hui MU Ying PU wei ming zhang Yue tao YANG Guang di LIU Ju zheng Department of Chemistry Jilin UniversityChangchun 130023P.R.China

The synthesis and structure of phenol groups containing ligand 2-[(cyclopentadienyl-phenyl)-methyl]phenol(CpH-PhCH-PhOH) were described. H Nuclear magnetic resonance (NMR) was used to show existence of ligand precursor in isomers of the group. Me3SiCp-PhCH-PhOSiMe3 was formed via treatment of 2 mol Me3SiCl with the dilithium salt of the ligand. New Ti compound [η+5, η1-C5H4-PhCH-PhO]TiCl2 was formed by reacting with titanium chloride.

关键词： Metallocene Catalyst Cyclopentadienyl group

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Elastoplastical analysis on cylinder of different moduli in tension and compression

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Journal of Coal Science & Engineering(China) 2009年第1期15卷 66-71页

作者： WANG wei-ming zhang Xiao-yan YANG Zhao WANG Qing-biao College of Civil Engineering and Architecture Shangdong University of Science and Technology Qingdao 266510 China

The constitutive equation was deduced. The results were obtained from theelastic and elastoplastical analysis of the cylinder sample applied with different ratios ofload on both the inner and outer sides and different moduli ratio. The factors affecting thedevelopment of the plastic field of the cylinder with finite radius were shown. The resultsshow that the different moduli ratio is the most important factor in the development of theplastic zone. The slight fluctuation of the ratio will bring multiplied increment of the displacement, which may result in the final destruction of the engineering material.

关键词： cylinder different moduli plastic zone elastoplastical analysis

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