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Role of grain boundary character on Bi segregation-induced embrittlement in ultrahigh-purity copper

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Journal of Materials Science & technology 2023年第28期159卷 52-61页

作者： y.X.Hua K.X.song H.t.Liu J.W.Wang C.M.Zhang y.J.Zhou B.Pang J.t.song J.L.He H.L.Zhao School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Academy of Sciences Zhengzhou 450000China Henan Key Laboratory of Advanced Conductor Materials Zhengzhou 450046China Provincial and Ministerial Co-construction of Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing technology Luoyang 471023China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Bismuth(Bi),as an impurity element in copper and copper-based alloys,usually has a strong tendency of grain boundary(GB)segregation,which depends on the GB ***,the influence of such a segregation on the properties of ultrahigh-purity copper has been rarely reported and the exact structural arrangements of Bi atoms at different GBs remain largely *** this study,we investigated the influ-ence of trace amounts of Bi(50-300 wt ppm)on the ductility of an ultrahigh-purity copper(99.99999%)in the range of room temperature to 900°*** tensile results show that the addition of Bi seriously damages the ductility of the ultrahigh-purity copper at temperatures of 450-900°C,which is due to the GB segregation of *** this basis,such a segregation behavior at different types of GBs,including high and low angle GBs(HAGBs/LAGBs),and twin boundaries(tBs),via the scanning electron microscope-electron backscattered diffraction(SEM-EBSD)and aberration-corrected scanning transmission electron microscope(AC-StEM)investigations,combined with the first-principles calculations were systematically *** atomistic characterizations demonstrate an anisotropic Bi segregation,where severe enrich-ment of Bi atoms typically occurs at the HAGBs,while the absence of Bi adsorption prevails at LAGBs or *** particular,the segregated Bi at random HAGBs exhibited the directional bilayer adsorption,while the special symmetrical7 HAGB presented a unique Bi-rich cluster *** findings pro-vide a comprehensive experimental and computational understanding on the atomic-scale segregation of impurities in metallic materials.

关键词： Grain boundary character Embrittlement Bi segregation Atomic configuration Ultrahigh-purity copper

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竞争环境下双目标零售平台销售模式选择

管理工程学报 2025年第1期39卷 227-242页

作者：张冲朱祎宋君南京邮电大学管理学院江苏南京210003

电子商务行业发展迅速,具有“超越利润”战略导向以实现更广泛目标的组织正变得越来越普遍,兼顾消费者利益成为企业凸显竞争优势的方式。为此,本文构建由一个制造商和两个零售平台组成的两级供应链。其中,制造商和其中一个零售平台追求... 详细信息

电子商务行业发展迅速,具有“超越利润”战略导向以实现更广泛目标的组织正变得越来越普遍,兼顾消费者利益成为企业凸显竞争优势的方式。为此,本文构建由一个制造商和两个零售平台组成的两级供应链。其中,制造商和其中一个零售平台追求自身利润最大化,另外一个零售平台追求自身利润和消费者剩余的线性组合最大化,即考虑双目标最优。本文具体考虑两个零售平台分别选择转售模式或代理模式共四种情形,进而研究双目标零售平台销售模式选择问题,及其对供应链成员最优决策和供应链整体绩效的影响。结果表明:(1)在一定条件下,双目标零售平台能获得比竞争对手更高的利润;(2)当双目标零售平台选择转售模式时,无论其竞争对手选择哪种销售模式,其双目标策略都能使供应链总体利润得到优化;(3)当双目标零售平台的竞争对手选择代理模式时,其自身根据不同情况选择转售模式或者代理模式可以使两个零售平台的销售模式选择形成均衡。

关键词：双目标企业社会责任零售平台销售模式双渠道

Printing perovskite and graphene parallel structure-based optical-mechanical sensors for human-machine interaction

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Science China technological Sciences 2025年

作者： Sisi CHEN Jiemin ZHANG Nan CHENG Wenbo LI Jing LIU Hongfei XIE Jie ZHANG yueying CHENG Xiaotong ZHAO Meng SU yanlin song Key Laboratory of Green Printing CAS Research/Education Center for Excellence in Molecular Sciences Institute of ChemistryChinese Academy of Sciences (ICCAS) University of Chinese Academy of Sciences Weiyang College Tsinghua University Department of Cardiovascular Surgery First Medical Center PLA General Hospital AECC Beijing Institute of Aeronautical Materials Beijing Institute of Graphene technology Beijing Engineering Research Centre of Graphene Application School of Integrated Circuit & Beijing National Research Center for Information Science and technology (BNRist) Tsinghua University

Surgical robots are designed to provide enhanced precision and dexterity compared to manual surgical procedures,which mainly rely on multimodal sensing technologies for the surgeon to seamlessly operate the robotic arms and *** with single-mode sensors, optical and mechanical bi-modal sensors provide improved precision, enhanced safety,and robustness of human-machine interaction systems. Here, the template-guided and pneumatic printing technologies are combined to construct perovskite and graphene parallel structures with both optical and mechanical sensing capabilities. the printed uniformly crystallized perovskite microstructure exhibits fast and sensitive photoelectric response characteristics,enabling shadow recognition functionality. the combination of graphene and elastic rubber endows the great printability to prepare parallel structures near the perovskite arrays for force sensing capabilities. thus, the printed perovskite and graphene structures possess non-contact optical sensing capabilities to detect hand position by recognizing shadows between the hand and the sensor, as well as contact mechanical sensing capabilities to detect touch force applied by the hand. It provides a synergistic platform for real-time and multidimensional feedback to improve human-machine interaction.

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市域产教联合体建设的理论意涵、典型特征与运行机制

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教育与职业 2025年第1期 5-13页

作者：许悦宋洁江苏理工学院南京师范大学教育科学学院江苏常州213001 常州工业职业技术学院江苏常州213001

市域产教联合体是产教融合组织形态的创新发展,也是职业教育改革发展的重要战略任务。从哲学本体论、目的论、方法论的角度看,其建设的本体是正确界定联合体的本质,目的是实现职业教育与产业发展的双向赋能,方法上以“多元治理”“协同... 详细信息

市域产教联合体是产教融合组织形态的创新发展,也是职业教育改革发展的重要战略任务。从哲学本体论、目的论、方法论的角度看,其建设的本体是正确界定联合体的本质,目的是实现职业教育与产业发展的双向赋能,方法上以“多元治理”“协同共生”的理念为指引。在多元协作、共建共享、互利共赢的建设原则下,市域产教联合体呈现出区域性、开放性、生态性、复杂性等鲜明的组织特征。在此基础上,构建涵盖政策引导机制、组织治理机制、产教嵌入机制、利益共享机制、绩效评价机制的运行机制,有助于进一步规范产教主体的联动发展,推动市域产教联合体的建设。

关键词：职业教育市域产教联合体产教融合运行机制

theory and Modeling of Phase transformations under Stress in Steel

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材料热处理学报 2004年第5期25卷 1-7页

作者： t.y. Hsu School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China

thermodynamic prediction of the increment of the formation temperature of proeutectoid ferrite by appliedstress is nearly consistent with the wxperfimental *** models for ferrite,pearlite and bainite transformations can be shown as modified Johnson-Mehl-Avrami equation in which parameter b() varies with the level of applied *** effects of tensile and compressive stresses on enhancement of the ferrite/pearlite and bainite transformations are discussed,the necessity and approach of modification of additivity hypothesis are introduced and the results from modified equation in which some parameters are obtained by rfegression of two experimental results or taken from ttt and CCt diagrams of a cerftain steel are superior than that from Scheil’s *** calculation of Ms and nucleation kinetics equations of martensitic transformation under stress are *** of phase trasformations under stress in ferrous alloys is briefly

关键词：钢相位转换受力状态热力学动力学成核现象相加性假设铁合金

Impact of Pollutant Concentration and Particle Deposition on the Radiative Flow of Casson-Micropolar Fluid between Parallel Plates

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 665-690页

作者： Ghaliah Alhamzi Badr Saad t.Alkahtani Ravi Shanker Dubey Vinutha Kalleshachar Neelima Nizampatnam Department of Mathematics and Statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11564Saudi Arabia Department of Mathematics College of ScienceKing Saud UniversityRiyadh11989Saudi Arabia Department of Mathematics Amity School of Applied SciencesAmity University RajasthanJaipur302002RajasthanIndia Department of Studies in Mathematics Davangere UniversityDavangere577002India Department of Electronics and Communication Engineering Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluru560035India

Assessing the behaviour and concentration of waste pollutants deposited between two parallel plates is essential for effective environmental *** the effectiveness of treatment methods in reducing pollution scales is made easier by analysing waste discharge *** waste discharge concentration analysis is useful for assessing how effectively wastewater treatment techniques reduce pollution *** study aims to explore the Casson micropolar fluid flow through two parallel plates with the influence of pollutant concentration and thermophoretic particle *** explore the mass and heat transport features,thermophoretic particle deposition and thermal radiation are *** governing equations are transformed into ordinary differential equations with the help of suitable similarity *** Runge-Kutta-Fehlberg’s fourthfifth order technique and shooting procedure are used to solve the reduced set of equations and boundary *** integration of a neural network model based on the Levenberg-Marquardt algorithm serves to improve the accuracy of predictions and optimize the analysis of *** outcomes are displayed to analyze the characteristics of the relevant dimensionless parameters in the current *** reveal that concentration upsurges as the micropolar parameter *** concentration reduces with an upsurge in the thermophoretic *** upsurge in the external pollutant source variation and the local pollutant external source parameters enhances mass *** surface drag force declines for improved values of porosity and micropolar parameters.

关键词： Micropolar fluid thermal radiation porous medium thermophoretic particle deposition waste discharge concentration

Impact of thermostat on interfacial thermal conductance prediction from non-equilibrium molecular dynamics simulations

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Chinese Physics B 2022年第5期31卷 561-568页

作者： song Hu C y Zhao Xiaokun Gu Institute of Engineering thermophysics School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

the knowledge of interfacial thermal conductance(ItC)is key to understand thermal transport in *** non-equilibrium molecular dynamics(NEMD)simulation is a useful tool to calculate the *** this study,we investigate the impact of thermostat on the prediction of the *** Langevin thermostat is found to result in larger ItC than the Nose-Hoover *** addition,the results from NEMD simulations with the Nose-Hoover thermostat exhibit strong size effect of thermal *** spectral heat flux decomposition and modal temperature calculation reveal that the acoustic phonons in hot and cold thermal reservoirs are of smaller temperature difference than optical phonons when using the Nose-Hoover thermostat,while phonons in the Langevin thermostat are of identical *** a nonequilibrium state of phonons in the case of the Nose-Hoover thermostat reduces the heat flux of low-to-middle-frequency *** also discuss how enlarging the reservoirs or adding an epitaxial rough wall to the reservoirs affects the predicted ItC,and find that these attempts could help to thermalize the phonons,but still underestimate the heat flux from low-frequency phonons.

关键词： interfacial thermal conductance phonon transport molecular dynamics

Eutectic-reaction brazing of Al_(0.3)CoCrFeNi high-entropy alloys using Ni/Nb/Ni interlayers

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Journal of Materials Science & technology 2022年第26期121卷 245-255页

作者： y.Lei J.Sun X.G.song M.X.yang t.L.yang J.yin State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Beijing Power Machinery Institute Beijing 100074China Sichuan Aerospace Changzheng Equipment Manufacturing Co. Ltd.Chengdu 610100China

In this study,a novel eutectic-reaction brazing of Al_(0.3)CoCrFeNi high-entropy alloys(HEAs)^(1)was investigated with a design of laminated Ni/Nb/Ni *** typical Al_(0.3)CoCrFeNi brazing seam consisted of proeutecticγ,the lamellar eutectic structure composed of face-centered cubic(FCC)phase(eutecticγ)and C14 Laves,as well as a few amounts of Nb based solid solution.A high density of nanoscale ordered L1_(2)(γ)phase was precipitated withinγphase *** the brazing temperature raised from 1200 to 1320℃,the dissolution volume of Al_(0.3)CoCrFeNi alloy into Ni-Nb liquid was *** microstructure of the brazing seam changed from hypereutectic(blocky Laves+γphase)to eutectic(Laves+eutecticγ)to hypoeutectic structures(proeutecticγ+Laves/γeutectic structure).the shear strength of joints was increased gradually due to the formation of eutectic lamellae and the cellular growth of proeutecticγ*** maximum shear strength of the joint brazed at 1320℃for 10 min was up to 592 MPa,reaching 95%of the base *** joint mainly ruptured in the soft proeutecticγphase in a ductile fracture mode.

关键词： High-entropy alloys Brazing Eutectic structure Shear strength

VERtICAL VELOCIty DIStRIBUtION IN StEADy NON-UNIFORM AND UNStEADy OPEN-CHANNEL FLOW

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Journal of Hydrodynamics 1997年第3期9卷 49-64页

作者： t. song, y. M.ChiewSchool of Civil and Structural Engineering, Nanyang technological University, Singapore639798 Nanyang technological Univ Singapore Singapore

Based on the continuity equation, the distribution of vertical velocity in equilibrium steady non-uniform and unsteady open-channel flows were deduced theoretically. then a recently developed Acoustic Doppler Velocity Profiler (ADVP) at the Swiss Federal Institute of technology was used to measure instantaneously the flow profiles. From these measurements, the vertical velocity and the other flow parameters were obtained. Additional data measured using an Acoustic Doppler Velocimeter (ADV) at the Nanyang technological University were also presented. the agreement between the theoretical distribution of vertical velocity and the measured data is reasonably good.

关键词： open-channel (flow,vertical velocity Acoustic Doppler Velocity Profiler,Acoustic Doppler Velocimeter