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粉末冶金材料典型塑性加工工艺力学分析

武汉理工大学学报 2004年第2期26卷 4-6页

作者：华林秦训鹏武汉理工大学材料科学与工程学院

塑性加工是粉末冶金材料的重要加工工艺 ,致密熔铸材料经典塑性理论 ,不适于塑性体积变化的粉末冶金材料。介绍了粉末冶金材料塑性加工中质量守恒、塑性泊松比小、静水压力可致塑性变形等基本性质。基于粉末冶金材料广义塑性理论 ,研究... 详细信息

塑性加工是粉末冶金材料的重要加工工艺 ,致密熔铸材料经典塑性理论 ,不适于塑性体积变化的粉末冶金材料。介绍了粉末冶金材料塑性加工中质量守恒、塑性泊松比小、静水压力可致塑性变形等基本性质。基于粉末冶金材料广义塑性理论 ,研究了粉末冶金材料单向压缩、复压、平板镦粗等典型塑性加工工艺的力学规律 ,导出了其塑性变形力与工件密度的理论关系式 ,为粉末冶金材料塑性加工工艺设计提供了理论依据。

关键词：粉末冶金材料塑性加工广义塑性理论力学计算

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Analysis of Moisture and Fat Using Microwave and NMR Technology

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Analysis of Moisture and Fat Using Microwave and NMR Technol...

第一届国际测量仪器与测试自动化学术会议

作者： Zhang Haiying Qi Jingyu Cao Ping (Department of Environmental and Energy engineering Shanghai Institute of Technology Shanghai china) (The state key laboratory of Pollution Control and Resource Reuse Tongji university Shanghai china) (Instrumental Analysis Center Tongji university Shanghai china)

＜正＞The moisture and fat analysis is a routine measurement in many industrial processes. NMR （Nuclear Magnetic Resonance） has not been used for wet samples because water protons interfere with the measurement of fat protons. By combining microwave drying with NMR. the technology can be used to measure the fat content. This paper discusses the principles of microwave and NMR technology and compares them to several conventional methods.

关键词： Microwave technology NMR technology moisture and fat analysis.

Merging SoC and LOC Together

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Merging SoC and LOC Together

2008 9th International Conference on Solid-state and Integrated-Circuit Technology

作者： Zhihong Li1, Xu Ji 1, Lu Wang 2, Jianzhong Xi 2 (1. National key laboratory of Nano/Micro Fabrication Technology, Institute of Microelectronics, Peking university, Beijing, 100871, china 2 Biomedical engineering Center, College of engineering, Peking university, Beijing, 100871, china)

A promising combination of the semiconductor integrated System-on-a-Chip （SoC） with the Lab-on-a-Chip （LOC） is brought in this paper. In this paper, we propose a new technology which enables monolithic integration of the self-assembled biological system, the MEMS structure, the microfluidic system, and CMOS electronic circuits together. Utilizing this approach, more functionality is introduced into the SoC, while the LOC becomes more intelligent and controllable. A Post-CMOS fabrication approach that meets the requirements is demonstrated to validate the idea.

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Expression profiles and transactivation analysis of a novel ethylene-responsive transcription factor gene GhERF5 from cotton

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Progress in Natural Science:Materials International 2009年第5期19卷 563-572页

作者： Longguo Jin, Bo Huang, Hui Li, Jinyuan Liu laboratory of Molecular Biology and MOE laboratory of Protein Science, Department of Biological Sciences and Biotechnology, Tsinghua university, Beijing 100084, china laboratory of Molecular Biology and MOE laboratory of Protein Science Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China

Plant AP2/EREBP transcription factors play important roles in plant development and in plant responses to biotic and abiotic stresses. A novel gene for ethylene-responsive element binding protein (EREBP), designated GhERF5, which encodes a protein of 255 amino acids, was isolated by RACE-PCR from cotton (Gossypium hirsutum) seedlings. Sequence alignment revealed that GhERF5 contains a typical AP2/ERF domain, and belongs to the B3 subgroup of the ERF subfamily. Particle bombardment assay showed that GhERF5 functions as an in vivo transcription activator in tobacco cells, and it is located in the nuclei of onion epidermis cells. Semi-quantitative RT-PCR revealed that the expression of GhERF5 was highly and rapidly induced when plants were treated with exogenous ethylene, abscisic acid (ABA), salt, cold and drought. Promoter analysis indicated that there are conserved cis-acting elements induced by these stresses in the 50-upstream region of the GhERF5 gene. These results suggest that the GhERF5 gene might play an important role in cotton response to ethylene, ABA and environmental stresses.

关键词： Ethylene-responsive element binding factor (ERF) Abiotic stresses Nuclear localization Transactivation Gossypium hirsutum

Preparation and Enhanced Photo-catalytic Performance of nc-TiO2/SnO2 Photonic Crystal Composite Membranes

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Preparation and Enhanced Photo-catalytic Performance of nc-T...

中国颗粒学会超微颗粒专委会2011年年会暨第七届海峡两岸超微颗粒学术研讨会

作者： Sheng-Li Chen~*,Ai-Jun Wang,Chun-Tian Hu,Chao Dai state key laboratory of Heavy Oil Processing,College of Chemical engineering,china university of Petroleum,Changping,Beijing,102249,china

An nc-TiO/SnO inverse opal composite membrane was fabricated,the photoactivity of which was significantly enhanced by utilizing both slow photons and stopband reflection of the photonic crystal *** materials of the photonic crystal layer must be transparent in the area of adsorption edge of the nc-TiO,so that SnO, having much greater electronic band gap than TiO,was used for the materials of the photonic crystal *** photonic band-gap of the SnO photonic crystal was designed at the semiconductor band gap of TiO to harvest slow photons in the interface between the SnO layer and the TiO *** two layer structure makes it possible to couple the stop-band reflectivity of the photonic layer to the photo-catalyst. Composite membranes can improve solar energy harvesting and substantially improve photo-catalysts for photolysis and photochemical degradation of environmental pollutants.

关键词： Nano-crystalline TiO2 Slow photons Photonic crystals SnO2 Inverse opal Stop-band reflection Photo-catalyst

Mesoscopic properties of dense granular materials:an overview

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Mesoscopic properties of dense granular materials:an overvie...

2012颗粒材料计算力学会议

作者： Sun Qi-Cheng1 Jin Feng1Zhang Guo-Gua21 state key laboratory for Hydroscience and engineering,Tsinghua university,Beijing 100083,china2 Department of Physics,Beijing university of Science and Technology,Beijing 100871,china

Geometrical parameters of discontinuities,such as spacing,length,dip and fault throw between joints havea great influence on the mechanical behavior of jointed rock *** characterization for discontinuities isimportant for investigate the stability of rock *** this paper,the PFC2D is combined with joint networkgeneration method to examine the mechanical behaviors of jointed *** Miaogou Open-pit Mine as anexample,the information and statistical distributions of discontinuities of the slope rock masses are measured byShapeMetriX3D measuring ***,the automatic generation algorithm of random joints network based on theMonte-Carlo method is proposed using the programming language(FISH) embedded within *** algorithmcould represent the discontinuities compared with the geological *** simulating the compression test of ajointed rock sample,the mechanical behavior and crack propagation were *** results reveal that thefailure mode and crack propagation of the jointed rock are dominated by the distribution of joints in addition to theintact rock *** simulation result shows the feasibility of the joints generating method in application tojointed rock mass.

关键词： jointed rock masses shape metrix3D monte-carlo stochastic simulation method PFC2D

A MICRO MULTI-OBJECTIVE GENETIC ALGORITHM FOR MULTI-OBJECTIVE OPTIMIZATIONS

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A MICRO MULTI-OBJECTIVE GENETIC ALGORITHM FOR MULTI-OBJECTIV...

The Fourth china-Japan-Korea Joint symposium on Optimization of Structural and Mechanical Systems

作者： Liu G.P. and Han X. state key laboratory of Advanced Design and Manufacture for Vehicle Body. College of Mechanical and Automotive engineering Hunan university 410082 Changsha china

＜正＞A micro multi-objective genetic algorithm based on the micro genetic algorithm is suggested for the multi-objective optimization problems. An external elite archive is used to store Pareto-optimal solutions of the evolutionary process. A non-dominated sorting is employed to classify the combinational population of the evolutionary population and the external elite population into several different non-dominated levels. A crowded-comparison approach is used in each level to keep the diversity of the population. All solutions from the first non-dominated level make up of the current non-dominated set. Once the small population converges, an exploratory operator will be applied to the external elite population to explore more non-dominated solutions near the current non-dominated set, and a restart strategy will be subsequently adopted. Simulation results for several difficult test functions indicate that the present method has higher efficiency and better convergence near the globally Pareto-optimal set for all test functions, and a better spread of solutions for some test functions compared to NSGA Ⅱ.

关键词： multi-objective optimizations genetic algorithm Pareto-optimal solutions non-dominated sorting

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构架侧梁焊接反变形量的优化分析

上海交通大学学报 2011年第11期45卷 1700-1704页

作者：赵利华张开林西南交通大学牵引动力国家重点实验室四川成都610031

以热弹塑性理论为基础,采用APDL语言对机车车辆构架侧梁进行了焊接变形数值仿真计算,并对侧梁进行现场跟踪测量.得出了侧梁的焊接变形仿真计算结果与测量值,两者基本吻合,误差在6%之内.以此仿真模型为基础,结合所制定的反变形方案,采用... 详细信息

以热弹塑性理论为基础,采用APDL语言对机车车辆构架侧梁进行了焊接变形数值仿真计算,并对侧梁进行现场跟踪测量.得出了侧梁的焊接变形仿真计算结果与测量值,两者基本吻合,误差在6%之内.以此仿真模型为基础,结合所制定的反变形方案,采用多层优化计算,对侧梁焊接时的反变形量进行数值仿真优化,最优方案与无反变形量的焊接相比,可使弯曲变形量减低65%左右.优化方案可为焊接变形的控制、焊接工艺设计的选择和预留变形量的确定等提供可靠依据.

关键词：焊接变形数值仿真逐一反变形法优化分析

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Thermoplastic Elastomers with Saturated Soft Segments

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Thermoplastic Elastomers with Saturated Soft Segments

第六届国际高技术高分子材料学术会议

作者： Yingxin Qiu1 Hong Cheng1 Beite Li1 Longcheng Gao2 Chenglong Zhang1 Xinhe Fan2 * Yixian Wu1* 1.state key laboratory of Chemical Resource engineering key laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials Beijing university of Chemical Technology Beijing 100029 china.2.key laboratory of Polymer Chemistry and Physics of Ministry of Education Peking university Beijing 100871 china

＜正＞The thermoplastic elastomers consisting of a totally saturated soft mid-segment of polyisobutylene（PIB）and rod blocks of polystyrene（or its derivatives）has long been a desirable objective

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