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电源技术 2024年第7期48卷 1198-1205页

作者：张贺明张遥付甜甜张洋中国电子科技集团公司第十八研究所天津300384

介绍了目前双电层电容器关键材料的发展和国内外的研究现状,包括:活性材料、导电剂、粘结剂、电解液和隔膜等;介绍了目前双电层电容器依性能特点在不同应用领域中的使用,讨论了双电层电容器所具有的优劣势及其发展趋势。

关键词：双电层电容器关键材料发展趋势

A solution of multidisciplinary collaborative simulation for complex engineering systems in a distributed heterogeneous environment

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Science in China(Series F) 2009年第10期52卷 1848-1862页

作者： zhang heming CIMS-ERC Department of Automation TNList Tsinghua University Beijing 100084 China

This paper presents an integrated approach to multidisciplinary collaborative simulation for complex engineering systems. The formulized paradigm of multidisciplinary collaborative simulation for com- plex engineering systems is principally analyzed. An IEEE HLA and web services based framework is proposed to provide a heterogeneous, distributed and collaborative running environment where multidisciplinary modeling, running management and post-processing of collaborative simulation are undertaken. The mechanism of multidisciplinary collaborative modeling, disciplinary model transformation, and time-synchronized simulation advancement are studied in detail. A prototype with the functions of multidisciplinary modeling, running management and post-processing for collaborative simulations is developed, and a typical complex engineering system is chosen as a case study to demonstrate the effectiveness of this new approach towards collaborative simulation.

关键词： multidisciplinary modeling distributed collaborative simulation HLA web services complex engineering system

APPLICATION OF STEP IN CAD/CAPP INTEGRATION

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 10-16页

作者： Wu, Ruirong zhang, heming Qinghua Univ China

A brief discussion of the content and methodology of STEP is given, and STEP based strategies for CAD/CAPP information integration is pointed out. A STEP based feature technology in which a three layer feature definition is included is discussed, the content of feature information is analyzed and a stratified CAD feature library is shown. On these bases, a commonly shared part information model is proposed. The architecture of the integrated CAD/CAPP system is presented.

关键词： STEP CAD/CAPP Integration Feature

Combinative Algorithms for the Multidisciplinary Collaborative Simulation of Complex Mechatronic Products Based on Major Step and Convergent Integration Step

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 355-363页

作者： LIANG Silue zhang heming WANG Hongwei National CIMSEngineeringResearch Center Tsinghua University Beijing 100084 China Computer and Information Management Center Tsinghua University Beijing 100084 China Engineering Design Centre University of Cambridge Cambridge CB2 1PZ UK

Multidisciplinary collaborative simulation （MCS） is an important area of research in the domain of multidisciplinary design optimization （MDO）.Although previous research for MCS has to some extent addressed some issues like using of multiple tools,integration stability,control of step size,data synchronization,etc,further work is still necessary to study how to achieve improved precision.A theoretical model is formulated to describe and analyze the integration process of MCS.A basic algorithm with equal major steps is proposed based on the model,along with two methods of implementation for the model,namely the serial method and the parallel method.A further algorithm based on convergent integration step is proposed,which has a more flexible strategy for run-time *** influence of interpolation techniques on simulation performance is studied as *** of the performance of various algorithms with different interpolation techniques are performed for both a simple numerical example and a complex mechatronic *** novel algorithm based on convergent integration step,when used with a high-order interpolation technique,has better performance in terms of precision and *** innovation of this paper is mainly on the validation of high precision of the proposed convergent integration step algorithm.

关键词： mechatronic product multidisciplinary collaborative simulation multi-rate integration convergent integration step

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关于培育高校学生媒介素养的若干思考

金华职业技术学院学报 2024年第1期24卷 1-7页

作者：张贺茗杨芳张春梅渤海大学辽宁锦州121013

当前是人与技术共存共赢、信息爆炸的数字化时代,媒介更迭愈加频繁,亦从一种传播载体泛化为一种社会环境,深切影响着大众的价值观念、思维方式和生活习惯。高校学生作为重要的受众群体,正处于世界观、人生观、价值观形成的特殊时期,而... 详细信息

当前是人与技术共存共赢、信息爆炸的数字化时代,媒介更迭愈加频繁,亦从一种传播载体泛化为一种社会环境,深切影响着大众的价值观念、思维方式和生活习惯。高校学生作为重要的受众群体,正处于世界观、人生观、价值观形成的特殊时期,而媒介的传播内容和传播方式会潜移默化地影响其道德观念、思想品行和生活习惯的变化。因此,基于新闻传播和思想政治教育的视阈,研究思考高校学生媒介素养培育的意义、制约因素和优化路径,以期提升高校学生媒介素养,推动高校思想政治教育现代化发展。

关键词：高校学生媒介媒介素养

BOM-BASED DESIGN KNOWLEDGE REPRESENTATION AND REASONING FOR COLLABORATIVE PRODUCT DEVELOPMENT

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Journal of Systems Science and Systems Engineering 2016年第2期25卷 159-176页

作者： Gongzhuang Peng Huachao Mao Hongwei Wang heming zhang National CIMSEngineeringResearch Center Tsinghua University Beijing 100084 China School of Engineering University of Portsmouth Anglesea Read Portsmouth PO1 3D J UK

Modem product development becomes increasingly collaborative and integrated, which raises the need for effectively and efficiently sharing and re-using design knowledge in a distributed and collaborative environment. To address this need, a framework is developed in this research to support design knowledge representation, retrieval, reasoning and fusion, which takes account of structural, functional and behavioral data, various design attributes and knowledge reasoning cases. Specifically, a multi-level knowledge representation based on the Base Object Model （BOM） is proposed to enable knowledge sharing using Web services technologies. On this basis, a multi-level knowledge reuse method is developed to support the retrieval, matching and assembly of knowledge records. Due to the tree structure of BOM, both depth-first and breadth-first searching strategies are employed in the retrieval algorithm while a novel measure is proposed to evaluate similarity. Moreover, a method based on the D-S evidence theory is developed to enable knowledge fusion and thus support effective decision-making. The framework has been implemented and integrated into an HLA-based simulation platform on which the development of a missile simulation example is conducted. It is demonstrated in the case study that the proposed framework and methods are useful and effective for design knowledge representation and reuse.

关键词： Complex product development multi-level knowledge reuse knowledge fusion Base Object Model D-S evidence theory

Thermodynamic equilibrium diagram of the chlorine-titanium system

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Rare Metals 2005年第4期24卷 313-316页

作者： DU Ailing GUO Xiaofei zhang heming LIU Jiang School of Chemistry and Chemical Engineering Shandong University Jinan 250061 China

The chemical and electrochemical equilibria of the chlorine-titanium system in the presence of gaseous phase were investigated. Many species, which consisted of chlorine and titanium, were considered. Various thermodynamic equilibria were calculated in the different pressures at different temperatures. The calculated results were shown as log p-1/Tand E-T diagrams. These diagrams may be used as important tools for corrosion study and titanium production. The diagrams are also used to thermodynamically determine the existence areas of various species and so on.

关键词： physical chemistry thermodynamic equilibrium equilibrium diagram chlorine-titanium system

Hole mobility enhancement in uniaxial stressed Ge dependence on stress and transport direction

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1860-1865页

作者： MA JianLi FU ZhiFen LIU Peng zhang heming School of Physics and Information Technology Shaanxi Normal University Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices Xidian University

Utilizing a six-band k.p valence band calculations that considered a strained perturbation Hamiltonian, uniaxial stress-induced valence band structure parameters for Ge such as band edge energy shift, split, and effective mass were quantitatively evaluated. Based on these valence band parameters, the dependence of hole mobility on uniaxial stress(direction, type, and magnitude) and hole transport direction was theoretical studied. The results show that the hole mobility had a strong dependence on the transport direction and uniaxial stress. The hole mobility enhancement can be found for all transport directions and uniaxial stess configurations, and the hole transport along the [110] direction under the uniaxial [110] compressive stress had the highest mobility compared to other transport directions and stress configurations.

关键词： Ge uniaxial stress valence band structure hole mobility

Hole scattering mechanism of strained Si/(111)Si_(1-x)Ge_x

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1801-1804页

作者： WANG Cheng zhang heming SONG JianJun HU HuiYong Key Lab of Wide Band-Gap Semiconductor Materials and Devices School of Microelectronics Xidian University Xi'an 710071 China

Based on Fermi’s golden rule and the theory of Boltzmann collision term approximation, the hole scattering mechanism ofstrained Si/(111)Si1 xGexwas established, including ionized impurity, acoustic phonon, non-polar optical phonon and totalscattering rate models. It was found that the total scattering rate of the hole in strained Si/(111)Si1 xGexdecreased obviouslywith the increasing stress when energy was 0.04 eV. In comparison with one of the unstrained Si, the total hole scattering rateof strained Si/(111)Si1 xGexdecreased about 38% at most. The decreasing hole scattering rate enhanced the hole mobility instrained Si materials. The result could provide valuable references to the research on hole mobility of strained Si materials andthe design of PMOS devices.

关键词： strained Si scattering rates mobility

Calculation of band structure in (101)-biaxially strained Si

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Science China(Physics,Mechanics & Astronomy) 2009年第4期52卷 546-550页

作者： SONG JianJun zhang heming HU HuiYong FU Qiang Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi’an 710071China

The structure model used for calculation was defined according to Vegard’s rule and Hooke’s law. Calculations were performed on the electronic structures of (101)-biaxially strained Si on relaxed Si1?X Ge X alloy with Ge fraction ranging from X = 0 to 0.4 in steps of 0.1 by CASTEP approach. It was found that [±100] and [00±1] valleys (δ4) splitting from the [0±10] valley (Δ2) constitute the conduction band (CB) edge, that valence band (VB) edge degeneracy is partially lifted and that the electron mass is unaltered under strain while the hole mass decreases in the [100] and [010] directions. In addition, the fitted dependences of CB splitting energy, VB splitting energy and indirect bandgap on X are all linear.

关键词： strained Si band structure effective mass