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Correlation between depassivation and repassivation processes determined by single particle impingement:Its crucial role in the phenomenon of critical flow velocity for erosion-corrosion

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Journal of Materials Science & Technology 2021年第30期89卷 158-166页

作者： L.L.Li Z.B.Wang S.y.He y.G.zheng CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Department of Physics Southern University of Science and TechnologyGuangdong 518055China

The correlation between depassivation and repassivation processes,which is significant in erosioncorrosion,was quantitatively investigated by single particle impingement tests at various flow velocities and impact *** results show that both repassivation and depassivation processes are associated with the kinetic energy of solid particle,and demonstrate that the repassivation is retarded by *** phenomenon probably results from the depassivation-induced microstructure *** this basis,the dependence of critical flow velocity(CFV)for erosion-corrosion on the solid particle concentration and diameter is further theoretically predicted and experimentally ***,the crucial role of depassivation-repassivation in CFV phenomenon is further highlighted.

关键词： Erosion-corrosion Stainless steel Depassivation-repassivation Single particle impact Passive film

ON THE STUDy OF SODIUM-P-NITROPHENOL COMPLEX

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Chinese Chemical Letters 1996年第2期7卷 177-180页

作者： Sun, PJ Guo, WS Lu, y zheng, QT CHINESE ACAD MED SCI INST MAT MED BEIJING 100050 PEOPLES R CHINA LIAONING NORMAL UNIV DEPT CHEM DALIAN 116022 PEOPLES R CHINA

This paper reports a complex of sodium chloride with p-nitrophenol. which has not previously been published. The composition and formation constant of the complex have been studied by ion;selective electrode, crystal ...

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Leader-follower: Human-centered intention-guided controller for novel SuperLimb with application to load-carrying scenarios

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Science China Technological Sciences 2025年第1期 325-338页

作者： Qinghua ZHANG Xianglong LI Hongwei JING Kerui SUN y.ancheng LI Sikai ZHAO Lele LI Haotian JU Ziqi WANG Rui WU Tianjiao zheng Jie ZHAO yanhe ZHU The State Key Laboratory of Robotics and System Harbin Institute of Technology The Learning Algorithms and Systems Laboratory School of Engineeringécole Polytechnique Fédérale de Lausanne

Supernumerary robotic arms(SuperLimb) are a new type of wearable robot that works closely with humans as a third hand to augment human operation capability. Accurate conveyance of wearers' intentions, allocation of roles, and humancentered interaction considerations are the key points in the process of human–SuperLimb collaboration. This paper proposes a human-centered intention-guided leader–follower controller that relies on the dynamic modeling of SuperLimb with application to load-carrying scenarios. The proposed leader–follower controller takes the human as the leader and the SuperLimb as the follower, achieving effective information communication, autonomous coordination, and good force compliance between SuperLimb, humans, and the environment under human safety assurance. First, the human–SuperLimb dynamic system is modeled to achieve force interaction with the environment and wearer. Second, to achieve the precise intention extraction of humans, pose data from five visual odometry sensors are fused to capture the human state, the generalized position, the velocity of hands, and the surface electromyography signals from two myoelectric bracelets sensors are processed to recognize the natural hand gestures during load-carrying scenarios by a designed Swin transformer network. Then, based on the real-time distance detection between human and mechanical limbs, the security assurance and force-compliant interaction of the human–SuperLimb system are realized. Finally, the human hand muscle intention recognition, human–robot safety strategy verification,and comparative load-carrying experiments with and without the proposed method are conducted on the SuperLimb *** showed that the task parameters are well estimated to produce more reasonable planning trajectories, and SuperLimb could well understand the wearer's intentions to switch different SuperLimb actions. The proposed sensor-based human–robot communication framework motivates future studies of o

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竞争环境下资金约束企业的召回风险管理策略

管理工程学报 2025年第2期39卷 262-281页

作者：陈静杨艺郑朝南邓开洋东南大学经济管理学院上海财经大学商学院香港中文大学社会科学学院

基于绩效进行采购订单分配是引入供应商竞争、提升零部件质量的一种常见手段。然而资金约束供应商为了避免后期财务困境的发生,很可能在初期削弱其质量投资以增加流动资金的持有量。由资金约束引发的质量竞争失效问题可能在制造商基于... 详细信息

基于绩效进行采购订单分配是引入供应商竞争、提升零部件质量的一种常见手段。然而资金约束供应商为了避免后期财务困境的发生,很可能在初期削弱其质量投资以增加流动资金的持有量。由资金约束引发的质量竞争失效问题可能在制造商基于保障零部件质量而实施的惩罚机制下更为严重。为此,越来越多的制造商采用保险机制提升供应商的财务能力。本文考虑召回成本随机分布,通过构建供应商的质量竞争模型,研究惩罚机制与保险机制对供应商质量竞争行为的影响。研究发现,相较于惩罚机制,保险机制使资金约束供应商更容易在低采购价格下进入市场并参与竞争。此外,惩罚机制或具有较高赔付限额的保险机制会产生“价格黑洞”。当采购价格位于“价格黑洞”中时,提高采购价格反而会带来更低的零部件质量。当保险赔付限额较低时,保险机制可形成非对称均衡,此时仅一家供应商能够进入市场。

关键词：资金约束质量竞争召回风险惩罚与保险

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Ultrahigh strength Mg-y-Ni alloys obtained by regulating second phases

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Journal of Materials Science & Technology 2020年第10期42卷 117-124页

作者： S.Z.Wu X.G.Qiao M.y.zheng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China

Mg-y-Ni alloys with different second phases were designed by changing y/Ni atomic ratio from 1.5 to *** microstructure and mechanical properties of as-cast and as-extruded alloys were *** as-cast Mg-y-Ni alloy with y/Ni ratio of 1.5 is composed ofα-Mg and long period stacking ordered(LPSO)*** y/Ni ratio is equal to 1,nanoscale lamellarγ’phase and eutectic Mg2Ni phase are formed in addition to LPSO *** y/Ni ratio decreases further,the amount of eutectic Mg2Ni phase increases,while the amount of LPSO phase *** extrusion,the LPSO andγ’phases are distributed along the extrusion direction,while eutectic Mg2Ni phase is broken and dispersed in the as-extruded *** phase and Mg2Ni phase in the alloys promote dynamic recrystallization(DRX)during extrusion,whileγ’phase inhibits ***,the Mg96y2Ni2(at.%)alloy with LPSO phase andγ’phase as the main second phases shows the strongest basal texture after *** tensile yield strength of the as-extruded Mg-y-Ni alloys increases first and then decreases with decreasing y/Ni *** as-extruded Mg96y2Ni2(at.%)alloy with y/Ni=1 exhibits excellent mechanical properties with tensile yield strength of 465 MPa,ultimate tensile strength of 510 MPa and elongation to failure of 7.2%,which is attributed to the synergistic effect of bulk LPSO phase and nanoscaleγ’phase.

关键词： Mg-y-Ni alloys LPSO γ’Phase Mg2Ni Mechanical properties

Exploring high-voltage fluorinated carbonate electrolytes for LiNi0.5Mn1.5O4 cathode in Li-ion batteries

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Journal of Energy Chemistry 2020年第3期29卷 62-70页

作者： Xi zheng ying Liao Zhongru Zhang Jianping Zhu Fucheng Ren Huajin He yuxuan Xiang yezhen zheng y.yang State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina College of Energy Xiamen UniversityXiamen 361102FujianChina

Ethyl-(2,2,2-trifluoroethyl)carbonate(ETFEC)is investigated as a solvent component in high-voltage electrolytes for LiNi0.5Mn1.5O4(LNMO).Our results show that the self-discharge behavior and the high temperature cycle performance can be significantly improved by the addition of 10%ETFEC into the normal carbonate electrolytes,e.g.,the capacity retention improved from 65.3%to 77.1%after 200 cycles at 60℃.The main reason can be ascribed to the high stability of ETFEC which prevents large oxidation of the electrolyte on the cathode *** addition,we also explore the feasibility of electrolytes using single fluoriated-solvents with and without *** results show that the cycle performance of LNMO material can be greatly improved in 1 MLiPF6+pure ETFEC-solvent system with 2 wt%ethylene carbonate(EC)or ethylene sulfate(DTD).The capacity retention of the LNMO materials is 93%after 300 cycles,even better than that of carbonate-based *** is shown that the additives are oxidized on the surface of LNMO particles and contribute to the formation of cathode/electrolyte interphase(CEI)*** composite CEI film plays a crucial role in suppressing the serious decomposition of the electrolyte at high voltage.

关键词： Fluorinated solvent High voltage electrolyte LiNi0.5Mn1.5O4 Interphase film Additive Lithium-ion batteries

Effect of a Carbon Fibre-steel Fibre-graphite Conductive Filler on the Electrothermal Properties of Cementitious Materials

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期 141-151页

作者：樊亚男 WEI Hong zheng Hongyong DU Hongxiu Department of Architecture and Environmental Engineering Taiyuan University College of Civil Engineering Taiyuan University of Technology

Carbon fibre,steel fibre and graphite were used as conductive fillers to prepare cementitious materials with excellent electrothermal *** electrically conductive cementitious materials with different volume dosages were analysed through compressive and flexural strength,electrochemical impedance spectroscopy.and temperature rise *** equivalent circuit model was established to study the electrically conductive heat generation mechanism in the electrically conductive cementitious *** results indicate that the mechanical properties of cementitious composite materials with a ternary conductive phase are better than those of pristine cementitious materials because the fibrous filler improves their mechanical ***,the incorporation of graphite in the material reduces its *** fibrous and point-like conductive phase materials into the cementitious material enhances the overall conductive pathway.and considerably reduces the electrical resistance of the cementitious material,enhancing its conductive *** volume ratios of carbon fibre,steel fibre and graphite that achieve an optimal complex doping in the cementitious material were 0.35%,0.6% and 6%,*** was determined using the mutation point of each circuit element parameter as the percolation *** addition,at a certain safety voltage,there is a uniform change between the internal and surface temperatures of the conductive cementitious material,and the heating effect in this materialis is considerably better than that in the pristine cementitious material.

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Strain Growth in Containment Vessels

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Transactions of Tianjin University 2006年第B09期12卷 193-198页

作者： DONG Q LI Q M zheng J y School of Mechanical Aerospace and Civil Engineering The University of Manchester PO Box 88 Manchester M60 1QD UK Institute of Chemical Machinery Zhejiang University Hangzhou 310027 China

Strain growth is a phenomenon observed in containment vessels subjected to internal blast loading. The elastic response of the vessel may become larger in a later stage compared to its response during the initial stage. The dynamic responses of infinitely long cylindrical containment vessels subjected to uniformly-distributed internal blast loading are studied using LS-DyNA. The development of bending modes and the interaction between the breathing mode and bending modes are observed. The methodology developed for dynamic elastic buckling analysis is employed to study the strain growth phenomenon in explosion containment vessels. It is shown that the dynamic instable vibration of a containment vessel is the basic mechanism of strain growth.

关键词： strain growth containment vessel dynamic response impulsive loading

Prevalence of primary Helicobacter pylori resistance to metronidazole and clarithromycin in Singapore

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World Journal of Gastroenterology 2000年第1期6卷 119-121页

作者： Hua JS Bow H zheng Py Khay-Guan y Department of Microbiology Faculty of Medicine National University of Singapore5Science Drive 2Singapore 117597Republic of Singapore Department of Medicine Faculty of Medicine National University of Singapore5Science Drive 2Singapore 117597Republic of Singapore

INTRODUCTIONEradication of Helicobacter pylori,a bacteriumresiding in stomach and causing peptic ulcer disease,can be achieved by using combination therapiesconsisting of one or two antibiotics with a protonpump inhibitor (PPI).The major antibiotics widelyused in the regimens to eradicate *** aremetronidazole and ***,resistance to these antibiotics by ***

关键词： Subject headings Helicobacter pylori triple therapy metronidazole clarithromycin