作者: CHEN Xiang-wei,MEI FENG-XIANG (Department of Applied Mechanics, Beijing Institute of Technology, Beijing 100081, ChinaDepartment of Physics, Shangqiu Teachers College, Shangqiu 476000, China;Department of Physics, Shangqiu Teachers College, Shangqiu 476000, China)
出处: 中国物理(英文版) 2000 第10期 P721-725
关键词: analytical;mechanics;variable;mass;symmetry;perturbation;adiabatic;invariant
摘要: The perturbation problem of symmetries for the holonomic variable mass systems under small excitation is dis cussed. The concept of high-order adiab ...
作者: Jiang Lan (Jiang Lan(School of Mechanical and Automation,Beijing Institute of Technology);Wang Xinyi(Tokyo University of Agriculture and Technology,Tokyo,Japan))
出处: 中国机械工程学报 2000 第3期 P228-233
关键词: Vehicle;dynamicsFour;wheel;steeringYaw;moment;controlFront;steering;angle;controlDoublecostfunction;LQR
摘要: The front steering angle control and its integration with the direct yaw moment control are suggested to enhance the handling performance for heavydu ...
作者: MEI Fengxiang,WU Huibin (College of Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处: 科学通报(英文版) 2000 第5期 P412-414
关键词: analytical;mechanics;Birkhoffian;system;first;integral;integral;invariant
摘要: The variational equation of the Birkhoffian system is established,by which it is proved that an integral invariant can be constructed with a known fir ...
作者: ZHANG Yi,MEI Fengxiang (ZHANG Yi (Department of Basic Courses, Suzhou Institute of Urban Construction & Environmental Protection, Suzhou 215011, China) MEI Fengxiang (Department of Applied Mechanics, Beijing Institute of Technology, Beijing 100081, China))
出处: 科学通报(英文版) 2000 第15期 P1354-1358
关键词: analytical;mechanics;unilateral;constraint;holonomic;system;Lie;symmetry;conserved;quantity
摘要: In the recent twenty years, the study on the Lie symmetries and conserved quantities of constrained mechanical systems has been making great progress[ ...
作者: ZHANG Yunhong,MA Chen,CHANG Hailong,LI Qianshu,FENG Juan,AI Xicheng (ZHANG Yunhong (School of Chemical Engineering and Materials Science, Beijing Institute of Technology, Beijing 100081, China) MA Chen (Institute of Chemistry , Chinese Academy of Sciences, Beijing 100080, China))
出处: 科学通报(英文版) 2000 第12期 P1082-1085
关键词: amphiphilic;porphyrin;micelle;trans-membrane
摘要: In order to perform a transfer process of the porphyrin moiety across membrane media, an amphiphilic porphyrin 5,10,15-tri(4-hydroxyphenyl)-20-(4-hexa ...
作者: TANG Guangshi,ZHU Hesun,SONG Yinglin (TANG Guangshi (Research Center of Materials Science, Beijing Institute of Technology, Beijing 100081, China;Department of Applied Chemistry, Beijing University of Chemicals Technology, Beijing 100029, China) ZHU Hesun (Research Center of Materials Science, Beijing Institute of Technology, Beijing 100081, China) SONG Yinglin (Department of Applied Physics, Harbin Institute of Technology, Harbin 150001, China))
出处: 科学通报(英文版) 2000 第2期 P150-153
关键词: C60;derivatives;N-nitride;structure;optical;limiting;properties;reverse;saturation;absorption
摘要: N-acetamide C60 nitride (N-acetamide-1,2-dihydro-1,2-aza-fullerene[60]) has been synthesized by the reaction of C60 and azidoacetamide and initially c ...
作者: 戴擎宇,杨占昕,何佩琨 (Department of Electrical Engineering, Beijing Institute of Technology, Beijing 100081, China)
出处: 中国航空学报(英文版) 2000 第1期 P30-33
关键词: target;tracking;edge;detection;parallel;processing
摘要: Inthe field of communication,radar and im-age processing,real- time analysis demands somuch data that the traditional method can\'t bear,and therefore ...
作者: 蒲恬,方庆喆,倪国强 (北京理工大学光电工程系)
出处: 电子学报 2000 第12期 P116-122
关键词: 图像融合;小波变换;多分辨分析;图像处理
摘要: 本文给出一种基于对比度的多分辨图像融合算法 .首先 ,利用小波变换得到待融合图像的多分辨分析 ,同时得到图像的多分辨对比度序列 ;然后以对比度为判据 ,在图像的多分辨分析的相应各级上进行融合 ,得到融合图像的多分辨分析 ;最后 ,利用小波逆变换重构融合图像 .算法使用同一场景可见光图像和红外图像进行 ...
作者: 杨军,金乾坤 (北京理工大学)
出处: 爆炸与冲击 2000 第3期 P241-247
关键词: 岩石爆破;损伤模型;衰减系数;数值计算
摘要: 在TCK损伤模型基础上 ,考虑岩石冲击损伤过程的声波测试衰减规律 ,构造新的岩石爆破损伤模型。将该模型装进LS DYNA3D动态有限元程序 ,通过岩石冲击损伤实验验证该程序的计算结果 ,并用新模型实现了岩石台阶爆破数值计算
作者: LI Jianzhong,LI Yingshu,Jaideep Srivastava (Department of Computer Science and Engineering,Harbin Institute of Technology Harbin 150001,P.R. China;Beijing Institute of Technology,Beijing 100876,P.R. China;University of Minnesota,USA)
出处: 计算机科学技术学报(英文版) 2000 第3期
关键词: OLAP;aggregation;data;warehouse
摘要: Multidimensional aggregation is a dominant operation on data warehouses for on-line analytical processing (CLAP). Many efficient algorithms to compute ...
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