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Combinatorial approaches for high-throughput characterization of mechanical properties

Journal of Materiomics 2017年第3期3卷 209-220页

作者： Xiaokun Zhang yong xiang State Key Laboratory of Electronic Thin Films&Integrated Devices School of Energy Science and EngineeringUniversity of Electronic Science and Technology of China2006 Xiyuan AvenueWest High-Tech ZoneChengduSichuan 611731China

Since the first successful story was reported in the middle of 1990s,combinatorial materials science has attracted more and more attentions in the materials *** the past two decades,a great amount of effort has been made to develop combinatorial high-throughput approaches for materials ***,few high-throughput mechanical characterization methods and tools were *** date,a number of micro-scale mechanical characterization tools have been developed,which provided a basis for combinatorial high-throughput mechanical *** existing micro-mechanical testing apparatuses can be pertinently modified for high-throughput *** example,automated scanning nanoindentation is used for measuring the hardness and elastic modulus of diffusion multiple alloy samples,and cantilever beam arrays are used to parallelly characterize the thermal mechanical behavior of thin films with wide composition *** interpretation of micro-mechanical testing data from thin films and micro-scale samples is most critical and challenging,as the mechanical properties of their bulk counterparts cannot be intuitively extrapolated due to the well-known size and microstructure ***,high-throughput mechanical characterization data from combinatorial micro-scale samples still reflect the dependence trend of the mechanical properties on compositions and microstructure,which facilitates the understanding of intrinsic materials behavior and the fast screening of bulk mechanical *** the promising compositions and microstructure are pinned down,bulk samples can be prepared to measure the accurate properties and verify the combinatorial high-throughput characterization *** developing combinatorial high-throughput mechanical characterization methods and tools,in combination with high-throughput synthesis,the structural materials research would be promoted by accelerating the discovery,development,and deployment

关键词： Materials genome Combinatorial High-throughput Mechanical properties Structural materials

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Recent advances in the electrochemistry of layered post-transition metal chalcogenide nanomaterials for hydrogen evolution reaction

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Journal of Energy Chemistry 2021年第9期30卷 451-479页

作者： yong Wang Yang Zhao xiang Ding Liang Qiao School of Physics University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina

Layered two-dimensional(2 D)materials have received tremendous attention due to their unique physical and chemical properties when downsized to single or few *** types of layered materials,especially transition metal dichalcogenides(TMDs)have been demonstrated to be good electrode materials due to their interesting physical and chemical *** from TMDs,post-transition metal chalcogenides(PTMCs)recently have emerged as a family of important semiconducting materials for electrochemical *** are layered materials which are composed of post-transition metals raging from main group IIIA to group VA(Ga,In,Ge,Sn,Sb and Bi)and group VI chalcogen atoms(S,selenium(Se)and tellurium(Te)).Although a large number of literatures have reviewed the electrochemical and electrocatalytic applications of TMDs,less attention has been focused on *** this review,we focus our attention on PTMCs with the aim to provide a summary to describe their fundamental electrochemical properties and electrocatalytic activity towards hydrogen evolution reaction(HER).The characteristic chemical compositions and crystal structures of PTMCs are firstly discussed,which are different from ***,inherent electrochemistry of PTMCs is discussed to unveil the well-defined redox behaviors of PTMCs,which could potentially affect their efficiency when applied as electrode ***,we focus our attention on electrocatalytic activity of PTMCs towards HER including novel synthetic strategies developed for the optimization of their HER *** review ends with the perspectives for the future research direction in the field of PTMC based electrocatalysts.

关键词： Post-transition metal chalcogenide Layered material Chemical composition Crystal structure Inherent electrochemistry Hydrogen evolution

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Microstructure and mechanical properties of Cr films deposited with different peak powers by high-power impulse magnetron sputtering

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Rare Metals 2023年第1期42卷 327-335页

作者： Yu Wang Bao-Hua Wu Fan Jiang Dong-Lin Ma Yan Yu Hong sun Nan Huang yong-xiang Leng Key Laboratory for Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China National Key Laboratory for Surface Physics and Chemistry Mianyang621907China

For high-power impulse magnetron sputtering(HIPIMS),the peak power applied to the target is of great importance for regulating the ionization degree of the metal target and ion/atom flux *** this work,chromium(Cr)films were deposited on 316-L stainless steel substrates and silicon(100) wafers with different peak powers by *** relationship between peak target power and properties of Cr films was explored in *** resulting structure and mechanical properties of deposited Cr films were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM),atomic force microscopy(AFM),indentation hardness and scratch *** results indicate that the ionization degree of metal target and ion/atom flux ratio increase with the increase in peak power but without the loss of deposition rate at the same *** low ionization degree,the deposited Cr film has low compressive residual stress and low hardness but good adhesion *** the ionization degree of target metal increases with increasing peak power,Cr film exhibits finer size and smoother surface with improved hardness but decreased adhesion strength.

关键词： Cr film HIPIMS Peak power Ionization degree Ion/atom ratio Mechanical properties

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Ergodic Measures of Geodesic Flows on Compact Lie Groups

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Acta Mathematica Sinica,English Series 2013年第9期29卷 1781-1790页

作者： Gang LIAO Wen xiang sun School of Mathematical Sciences Peking University

Let Ψ be the geodesic flow associated with a two-sided invariant metric on a compact Lie group. In this paper, we prove that every ergodic measure μ of Ψ is supported on the unit tangent bundle of a flat torus. As an application, all Lyapunov exponents of μ are zero hence μ is not hyperbolic. Our underlying manifolds have nonnegative curvature （possibly strictly positive on some sections）, whereas in contrast, all geodesic flows related to negative curvature are Anosov hence every ergodic measure is hyperbolic.

关键词： Geodesic flows entropy compact Lie groups two sided invariant metrics

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刃宽对硬岩掘进影响的仿真及试验研究

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工程科学学报 2025年第1期47卷 13-24页

作者：尚勇孙靖东姜海峰许顺海段红磊孙朝阳北京科技大学机械工程学院北京100083 中铁工程装备集团隧道设备制造有限公司河南453000

滚刀在硬岩掘进中极易发生崩刃、偏磨等异常失效,研究硬岩掘进条件下刃型参数对滚刀破岩载荷和破岩效率的影响十分重要.本文采用滚刀破岩试验和仿真分析相结合的方法,从载荷曲线、破岩体积、破岩比能等方面分析了刃宽对滚刀破岩的影响.... 详细信息

滚刀在硬岩掘进中极易发生崩刃、偏磨等异常失效,研究硬岩掘进条件下刃型参数对滚刀破岩载荷和破岩效率的影响十分重要.本文采用滚刀破岩试验和仿真分析相结合的方法,从载荷曲线、破岩体积、破岩比能等方面分析了刃宽对滚刀破岩的影响.基于双线性本构模型及Benzeggagh–Kenane损伤断裂准则建立了岩石材料的内聚力本构模型,通过单轴抗压试验及巴西劈裂试验对内聚力本构模型的微观参数进行了校准,并进一步建立了滚刀破岩的内聚力仿真模型.结果表明:内聚力本构模型可以准确的模拟破岩过程中岩石裂纹的萌生和扩展过程.依据裂纹的萌生和扩展情况,滚刀破岩过程主要分为三个阶段:弹性阶段、裂纹萌生–扩展阶段及岩石破坏卸载阶段.滚刀破岩载荷和破岩体积随着贯入度、刀间距和刃宽的增加而增加;破岩比能随刃宽的增加呈先减小后增大的趋势.对于所选取的硬岩,采用13 mm刃宽滚刀破岩时比能最小,破岩效率最高;7 mm刃宽滚刀破岩时无法形成贯通岩片,相邻滚刀之间仍存在岩脊,破岩效率较低.

关键词：滚刀刃宽 Cohesive模型线切割试验破岩载荷破岩效率

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Biological conversion pathways of sulfate reduction ammonium oxidation in anammox consortia

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Frontiers of Environmental Science & Engineering 2020年第3期14卷 15-25页

作者： Zhen Bi Deqing Wanyan xiang Li yong Huang National and Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou 215002China School of Environment Science and Engineering Suzhou University of Science and TechnologySuzhou 215002China

For over two decades,sulfate reduction with ammonium oxidation(SRAO)had been reported from laboratory *** was considered an autotrophic process mediated by anammox bacteria,in which ammonium as electron donor was oxidized by the electron acceptor *** process had been attributed to observed transformations of nitrogenous and sulfiirous compounds in natural *** obtained differed largely for the conversion mole ratios(ammonium/sulfate),and even the intermediate and final products of sulfate ***,the hypothesis of biological conversion pathways of ammonium and sulfate in anammox consortia is *** this study,continuous reactor experiments(with working volume of 3.8L)and batch tests were conducted under normal anaerobic(0.2

关键词： Anammox bacteria Autotrophic Biological conversion Sulfate reducing am m onium oxidation (SRAO)

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Parameter Estimates in Random Intercept Mixed Effects Model for Repeated Measures

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Acta Mathematica Sinica,English Series 2007年第4期23卷 685-696页

作者： Yah sun Gen xiang CHAI School of Economics Shanghai University of Finance and Economics Shanghai 200433 P. R. China Department of Applied Mathematics Tongji University Shanghai 200092 P. R. China

In this article the following random intercept mixed effects model will be considered： yij = vi =v^τijβ＋ εij,i=1,…,m;j=1,2,…,ni, where {vi} are i.i.d, random effects with mean α 2. 2 and finite variance σ^2 v, {εij} are i.i.d, random errors with finite variance ε^2 ε. Here we will estimate α,σ^2 v,σ^2 ε,β and study their large sample properties, such as strong consistency, strong convergence rates and asymptotic normality.

关键词： Repeated measures Random effects Convergence system Strong convergence Strong convergence rate

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Physics-Informed Neural Networks with Two Weighted Loss Function Methods for Interactions of Two-Dimensional Oceanic Internal Solitary Waves

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Journal of Systems Science & Complexity 2024年第2期37卷 545-566页

作者： sun Junchao CHEN yong TANG Xiaoyan School of Mathematical Sciences Key Laboratory of Mathematics and Engineering Applications(Ministry of Education)&Shanghai Key Laboratory of PMMPEast China Normal UniversityShanghai 200241China College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China

The multiple patterns of internal solitary wave interactions(ISWI)are a complex oceanic *** remote sensing techniques indirectly detect these ISWI,but do not provide information on their detailed structure and ***,the authors considered a three-layer fluid with shear flow and developed a(2+1)Kadomtsev-Petviashvili(KP)model that is capable of describing five types of oceanic ISWI,including O-type,P-type,TO-type,TP-type,and *** learning models,particularly physics-informed neural networks(PINN),are widely used in the field of fluids and internal solitary ***,the authors find that the amplitude of internal solitary waves is much smaller than the wavelength and the ISWI occur at relatively large spatial scales,and these characteristics lead to an imbalance in the loss function of the PINN *** solve this problem,the authors introduce two weighted loss function methods,the fixed weighing and the adaptive weighting methods,to improve the PINN *** successfully simulated the detailed structure and dynamics of ISWI,with simulation results corresponding to the satellite *** particular,the adaptive weighting method can automatically update the weights of different terms in the loss function and outperforms the fixed weighting method in terms of generalization ability.

关键词： Internal solitary wave interactions KP equation PINN method weighted loss function method

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Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites:ring structures and ionic plasma oscillations

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Light(Science & Applications) 2022年第10期11卷 2388-2398页

作者： Xiaoxiao sun yong Zhang Weikun Ge Laboratory for Thin Films and Photovoltaics Empa-Swiss Federal Laboratories for Materials Science and Technology8600 DuebendorfSwitzerland Department of Information Technology and Electrical Engineering ETH Zurich8093 ZurichSwitzerland Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-RossendorfDresden 01328Germany Department of Electrical and Computer Engineering The University of North Carolina at CharlotteCharlotteNC 28223USA Department of Physics Tsinghua UniversityBeijing 10084People's Republic of China

Contrary to the common belief that the light-induced halide ion segregation in a mixed halide alloy occurs within the illuminated area,we find that the Br ions released by light are expelled from the illuminated area,which generates a macro/mesoscopic size anion ring surrounding the illuminated area,exhibiting a photoluminescence *** intriguing phenomenon can be explained as resulting from two counter-balancing effects:the outward diffusion of the light-induced free Br ions and the Coulombic force between the anion deficit and surplus *** after removing the illumination,the macro/mesoscopic scale ion displacement results in a built-in voltage of about 0.4 V between the ring and the ***,the displaced anions return to the illuminated area,and the restoring force leads to a damped ultra-low-frequency oscillatory ion motion,with a period of about 20-30 h and lasting over 100 *** finding may be the first observation of an ionic plasma oscillation in *** understanding and controlling the"ion segregation"demonstrate that it is possible to turn this commonly viewed"adverse phenomenon"into novel electronic applications,such as ionic patterning,self-destructive memory,and energy storage.

关键词： mixed removing return

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Crystallization of a Ti-based Bulk Metallic Glass Induced by Electropulsing Treatment

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Journal of Iron and Steel Research International 2016年第1期23卷 69-73页

作者： yong-jiang HUANG xiang CHENG Hong-bo FAN Shi-song GUAN Zhi-liang NING Jian-fei sun National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology School of Materials Science and Engineering Harbin Institute of Technology

The effect of electropulsing treatment（EPT）on the microstructure of a Ti-based bulk metallic glass（BMG）has been *** maximum current density applied during EPT can exert a crucial role on tuning the microstructure of the *** the maximum current density is no more than 2 720A/mm^2,the samples retains amorphous nature,whereas,beyond that,crystalline phases precipitate from the glassy *** EPT,the maximum temperature within the samples EPTed at the maximum current densities larger than 2 720A/mm^2 is higher than the crystallization temperature of the BMG,leading to the crystallization event.

关键词： bulk metallic glass electropulsing transmission electron microscopy crystallization microstructure

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