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高温下钢框架结构非线性有限元分析

上海交通大学学报 1996年第8期30卷 55-59页

作者：赵金城沈为平上海交通大学建筑工程与力学学院上海

对高温下钢框架结构的非线性进行了有限元分析，分析中涉及到由于高温及塑性区扩展引起的结构内力重分布、变形及临界温度等问题，给出了一些算例分析．

关键词：钢框架框架结构非线性分析有限元法

钢框架柱栓焊混合拼接节点初始刚度计算及有限元分析

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建筑结构 2020年第15期50卷 118-125页

作者：王乾赵金城上海交通大学船舶海洋与建筑工程学院上海200240

以钢框架结构中常见的柱栓焊混合拼接节点为研究对象。首先研究了拼接节点的变形特征和破坏模式,基于分析结果提出节点初始刚度的计算方法。其次,建立还原工程实际的节点有限元数值模型并对其进行验证;同时,分析了截面尺寸及轴压比对节... 详细信息

以钢框架结构中常见的柱栓焊混合拼接节点为研究对象。首先研究了拼接节点的变形特征和破坏模式,基于分析结果提出节点初始刚度的计算方法。其次,建立还原工程实际的节点有限元数值模型并对其进行验证;同时,分析了截面尺寸及轴压比对节点初始刚度及变形特征的影响,并根据欧洲EC3规范和美国AISC规范关于连接节点初始刚度的定义及分类,判定钢框架柱栓焊混合拼接节点并非传统意义上的刚性节点。此外,基于腹板厚度对节点初始刚度有着显著影响这一结论,拟合了所采用的节点拼接形式对应的初始刚度简化计算公式,该方法可推广应用于其他拼接尺寸及螺栓布置形式下钢框架柱栓焊混合拼接节点初始刚度的计算。

关键词：钢框架柱栓焊混合拼接节点等强度设计法初始刚度半刚性连接

Additive manufactured osseointegrated screws with hierarchical design

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Bio-Design and Manufacturing 2024年第2期7卷 206-235页

作者： Wenbo Yang Hao Chen Haotian Bai Yifu Sun Aobo Zhang Yang Liu Yuchao Song Qing Han jincheng Wang Department of Orthopedics Second Hospital of Jilin UniversityChangchun 130022China College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China School of Materials Science and Engineering Jilin UniversityChangchun 130022China

Bone screws are devices used to fix implants or bones to ***,conventional screws are mechanically fixed with thread and often face long-term failure due to poor *** improve osseointegration,screws are evolving from solid and smooth to porous and *** manufacturing(AM)offers a high degree of manufacturing freedom,enabling the preparation of predesigned screws that are porous and *** paper provides an overview of the problems currently faced by bone screws:long-term loosening and screw ***,advances in osseointegrated screws are summarized hierarchically(sub-micro,micro,and macro).At the sub-microscale level,we describe surface-modification techniques for enhancing *** the micro level,we summarize the micro-design parameters that affect the mechanical and biological properties of porous osseointegrated screws,including porosity,pore size,and pore *** addition,we highlight three promising pore shapes:triply periodic minimal surface,auxetic structure with negative Poisson ratio,and the Voronoi *** the macro level,we outline the strategies of graded design,gradient design,and topology optimization design to improve the mechanical strength of porous osseointegrated ***,this paper outlines advances in AM technology for enhancing the mechanical properties of porous osseointegrated *** osseointegrated screws with hierarchical design are expected to provide excellent long-term fixation and the required mechanical strength.

关键词： Bone screws Additive manufacturing Architecture design Surface modification

Stable Cycling of All-Solid-State Lithium Metal Batteries Enabled by Salt Engineering of PEO-Based Polymer Electrolytes

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Energy & Environmental Materials 2024年第2期7卷 67-74页

作者： Lujuan Liu Tong Wang Li Sun Tinglu Song Hao Yan Chunli Li Daobin Mu jincheng Zheng Yang Dai Department of Chemical Engineering Shanghai UniversityShangda Road 99Shanghai 200444China School of Material Science&Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics Xiamen UniversityXiamen 361005China

Poly(ethylene oxide)(PEO)-based polymer electrolytes show the prospect in all-solid-state lithium metal batteries;however,they present limitations of low room-temperature ionic conductivity,and interfacial incompatibility with high voltage ***,a salt engineering of 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide lithium salt(LiHFDF)/LiTFSI system was developed in PEO-based electrolyte,demonstrating to effectively regulate Li ion transport and improve the interfacial stability under high *** show,by manipulating the interaction between PEO matrix and TFSI^(-)-HFDF^(-),the optimized solid-state polymer electrolyte achieves maximum Li+conduction of 1.24×10^(-4)S cm^(-1)at 40℃,which is almost 3 times of the ***,the optimized polymer electrolyte demonstrates outstanding stable cycling in the LiFePO_(4)/Li and LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)/Li(3.0-4.4 V,200 cycles)based all-solid-state lithium batteries at 40℃.

关键词： all-solid-state battery high voltage li-ion conductivity molecular interaction poly(ethylene oxide)

基于变孔隙压缩系数的深部低阶煤层渗透率实验

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石油学报 2014年第3期35卷 462-468页

作者：汪岗秦勇申建赵丽娟赵锦程李叶朋中国矿业大学资源与地球科学学院煤层气资源与成藏过程教育部重点实验室江苏徐州221008

深部低煤阶煤渗透率研究可为深部煤层气评价选区提供关键依据。基于应力-孔隙压缩系数-渗透率三者关系理论分析,利用高温覆压孔渗透实验数据,构建了变孔隙压缩系数下深部煤层渗透率预测模型。实验结果显示,变孔隙压缩系数下渗透率的预... 详细信息

深部低煤阶煤渗透率研究可为深部煤层气评价选区提供关键依据。基于应力-孔隙压缩系数-渗透率三者关系理论分析,利用高温覆压孔渗透实验数据,构建了变孔隙压缩系数下深部煤层渗透率预测模型。实验结果显示,变孔隙压缩系数下渗透率的预测模型较定孔隙压缩系数下渗透率预测模型能更为准确描述深部煤层渗透率,老君庙矿区的初始孔隙压缩系数为0.09 MPa^(-1),孔隙压力随有效应力变化的衰减系数为0.07 MPa^(-1),且初始渗透率随着温度升高而降低。根据孔隙压缩系数的定义,计算得到孔隙压缩系数。计算结果显示:实测孔隙压缩系数与拟合孔隙压缩系数之间的相关性较强;随着埋深增加,定孔隙压缩系数较变孔隙压缩系数模型下预测的渗透率偏低,揭示了该地区深部煤层渗透率并非如前所预期之悲观,仍存在一定可采潜力。

关键词：准噶尔盆地深部煤层气渗透率孔隙压缩系数预测模型

Graded Heterojunction Improves Wide-Bandgap Perovskite for Highly Efficient 4-Terminal Perovskite/Silicon Tandem Solar Cells

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Research 2024年第2期2023卷 181-190页

作者： Wenming Chai Lindong Li Weidong Zhu Dazheng Chen Long Zhou He Xi jincheng Zhang Chunfu Zhang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology&Shaanxi Joint Key Laboratory of Graphene School of MicroelectronicsXidian UniversityXi'anShaanxi 710071China Xi'an Baoxin Solar Technology Co. Ltd.Xi'an710071China

Wide-bandgap(WBG)perovskite solar cells(PSCs)are essential for highly efficient and stable silicon/perovskite tandem solar *** this study,we adopted a synthetic strategy with lead thiocyanate(Pb(SCN)_(2))additive and methylammonium chloride(MACl)posttreatment to enhance the crystallinity and improve the interface of WBG perovskite films with a bandgap of 1.68 *** excessive PbI_(2)was formed at grain boundaries and converted into MAPbI_(3-x)Cl_(x)perovskites,which are utilized to form the graded heterojunction(GHJ)and compressive *** is beneficial for passivating nonradiative recombination defects,suppressing halide phase segregation,and facilitating carrier ***,the device with GHJ delivered a champion efficiency of 20.30%and superior stability in ambient air and under 85℃.Finally,we achieved a recorded efficiency of 30.91%for 4-terminal WBG perovskite/TOPCon tandem silicon solar *** findings demonstrate a promising approach for fabricating efficient and stable WBG PSCs through the formation of GHJ.

关键词： perovskite Graded Highly

基于开关瞬态过程分析的母排杂散电感提取方法研究

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中国电机工程学报 2014年第36期34卷 6442-6449页

作者：冯高辉袁立强赵争鸣赵锦成鲁挺电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系) 北京市海淀区100084 军械工程学院车辆与电气工程系河北省石家庄市050003

换流回路杂散电感和其中的di/dt共同作用,会使得开关器件在关断瞬态过程中,承受很高的感应电压尖峰,增大器件的电应力、增加系统开关损耗和电磁干扰,同时会使输出电压中包含大量高次谐波,影响系统性能。因此需要对包含换流回路在内的线... 详细信息

换流回路杂散电感和其中的di/dt共同作用,会使得开关器件在关断瞬态过程中,承受很高的感应电压尖峰,增大器件的电应力、增加系统开关损耗和电磁干扰,同时会使输出电压中包含大量高次谐波,影响系统性能。因此需要对包含换流回路在内的线路杂散电感进行准确计算,这其中以母排杂散电感最为关键。该文在对现有多种杂散电感提取方法进行分析比较的基础上,对换流回路开关瞬态过程的多个阶段进行梳理,寻找到开关瞬态过程中对杂散电感提取最有利的阶段,提出利用开通瞬态过程配合积分运算的方法代替目前利用关断电压峰值配合微分计算的方法。以实际3.3k V/1200A的IGBT构成的大容量变换器为分析对象,利用该方法对其进行杂散电感提取,并与部分单元等效电路的分析结果对比,验证该文提出的杂散电感值提取方法的准确性和实用性。

关键词：母排杂散电感开关过程分析多脉冲测试

考虑不同温度—应力路径及复杂温度分布状态下的钢结构火灾非线性分析

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四川建筑科学研究 2007年第1期33卷 19-23页

作者：杨祎赵金城上海交通大学土木工程系上海200240

采用考虑温度—应力路径影响的高温下钢材的应力—应变关系,并考虑构件截面上温度非线性的分布状况,对火灾中钢结构的反应进行非线性分析,旨在尝试提出一种更加符合实际情况的钢结构抗火分析新方法。根据已有的试验结果,对高温材性试验... 详细信息

采用考虑温度—应力路径影响的高温下钢材的应力—应变关系,并考虑构件截面上温度非线性的分布状况,对火灾中钢结构的反应进行非线性分析,旨在尝试提出一种更加符合实际情况的钢结构抗火分析新方法。根据已有的试验结果,对高温材性试验数据进行了回归分析,得到Q235钢在升温恒载、升温加载、升温降载3种基本温度—应力路径的本构关系式。根据有限元原理,提出截面上温度分布的瞬态分析方法,并与欧洲规范、SAFIR程序进行对照,验证其正确性,为结构抗火全过程分析提供了理论基础。

关键词：温度-应力路径火灾温度瞬态分析非线性分析

Correlative Mn-Co catalyst excels Pt in oxygen reduction reaction of quasi-solid-state zinc-air batteries

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Nano Research 2024年第5期17卷 4118-4124页

作者： Tingting Wang jincheng Huang Wei Sang Cai Zhou Bohan Zhang Wei Zhu Kang Du Zongkui Kou Shengxiang Wang School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Zn-air batteries(ZABs)as a class of promising energy storage setups are generally powered by efficient and robust catalysts at the oxygen-involving *** the existing non-noble catalysts have outperformed noble Pt benchmark in the alkaline liquid-state ZABs,to the best of our knowledge few have excelled Pt in quasi-solid-state(QSS)***,we found that an integrated Mn-Co cathode derived from the bimetallic Mn/Co metal organic frameworks generates a 1.4-fold greater power density in the QSS ZABs than a Pt cathode while its power density in liquid-state ZABs is only 0.8-fold of the ***,such Mn-Co catalyst delivers high-rate oxygen reduction reaction(ORR)capability with half-wave potential of 0.84 *** in-depth characterizations and analyses have demonstrated that the Co and Mn species show the specific affinity towards H_(2)O and O_(2),respectively,synergizing the ORR process in the water-deficient environment of QSS *** work has enlightened the rational design of non-noble metal catalysts to improve the power density of QSS ZABs.

关键词： non-noble metal catalysts zinc-air battery quasi-solid-state synergistic effect