作者: 李茂林,杨新林,朱鹤孙,王俐勇 (北京理工大学材料研究中心 北京;北京理工大学材料研究中心)
出处: 自然科学进展 2002 第12卷 第12期 P1263-1267
关键词: 反义核酸;凝血因子ⅧC;生物活性材料;血管内皮细胞
摘要: 利用人工合成的部分反义核酸ⅧC(以pⅧC表示)用以构建含有部分反义凝血因子基因片段的真核表达质粒pXJ41-neo/pⅧC,再用磷酸钙介导转染血管内皮细胞,筛选出阳性克隆血管内皮细胞,扩大培养转基因细胞,用金黄色葡萄球菌凝集试验和酶联免疫吸附试验(ELISA)检测转基因细胞ⅧC蛋白质的表达水平.结果 ...
作者: 张勇,冯增国,刘凤香,张爱英 (北京理工大学化工与材料学院;北京燕山石油化工公司研究院;北京理工大学化工与材料学院 北京)
出处: 化学学报 2002 第12期 P2225-2232
关键词: 聚醚酯弹性体;序列结构分析;力学性能;缩聚;嵌段共聚物
摘要: 用熔融缩聚法合成了一系列基于聚对苯二甲酸丁二醇酯(PBT)、聚丁二酸丁二醇酯(PBS)及聚乙二醇(PEG)的嵌段共聚物(PBT co PBS/PEG).1HNMR结构分析显示,软段摩尔百分含量恒为 2 0 %.随组成中PBS含量增加,软段质量百分含量略微升高,硬段PBT平均序列长度由 2 80逐步 ...
作者: 梅凤翔,郑改华 (Department of Applied Mechanics,Beijing Institute of Technology,Beijing 100081,China)
出处: Acta Mechanica Sinica 2002 第4期 P414-419
关键词: analytical;mechanics;Noether;symmetry;Lie;symmetry
摘要: The Noether symmetry is an invariance of Hamilton action underinfinitesimal transformations of time and the coordinates.The Lie symmetry is aninvarian ...
作者: 鲁世平,葛渭高 (Department of Applied Mathematics, Beijing Institute of Technology, Beijing 100081, P R China;Department of Mathematics, Anhui Normal University, Wuhu, Anhui 241000, P R China;Department of Applied Mathematics, Beijing Institute of Technology, Beijing 100081, P R China)
出处: 应用数学和力学(英文版) 2002 第23卷 第12期 P1421-1428
关键词: neutral;functional;differential;equation;fixed;point;principle;periodic;solution
摘要: The problem of periodic solutions for a kind of kth-order linear neutral functionaldifferential equation is studied. By using the theory of Fourier ex ...
作者: 孙竹凤,范天佑,吴祥法 (Research Centre of Materials Science, Beijing Institute of Technology, P.O. Box 327, Beijing 100081, China)
出处: Acta Mechanica Sinica 2002 第3期 P302-308
关键词: dynamic;loading;three-dimensional;elliptic;crack;dynamic;stress;intensity;factor
摘要: This paper presents a formulation for three-dimensional elasto-dynamics with an elliptic crack based on the Laplace and Fourier transforms andthe conv ...
作者: 姚延荪,邹健 (Department of Applied Physics, Beijing Institute of Technology, Beijing 100081, China)
出处: 中国物理:英文版 2002 第11卷 第11期 P1200-1204
关键词: Josephson;junction;quantized;field;collapse;and;revival;damping;rate
摘要: We study the quantum dynamics of a single-Cooper-pair box biased by a classical voltage and also irradiated by asingle-mode quantized field. We demons ...
作者: MEI Fengxiang (Department of Applied Mechanics, Beijing Institute of Technology, Beijing 100081, China)
出处: 科学通报(英文版) 2002 第47卷 第24期 P2049-2050
关键词: mechanical;system;phase;space;non-Noether;conserved;quantity
摘要: A non-Noether conserved quantity for the differential equations of motion of mechanical systems in the phase space is studied. The differential equati ...
作者: 李显方,范天佑 (College of Science, Hunan Normal University, Changsha, Hunan 410081, China;Department of Applied Physics, Beijing Institute of Technology, Beijing 100081, China)
出处: 中国物理(英文版) 2002 第11卷 第3期 P266-271
关键词: quasi-crystal;crack;elastic;field;energy;release;rate;singularity
摘要: The elastic analysis of a mode Ⅱ Griffith crack penetrating through a decagonal quasi-crystal along the periodicaxis is made within the context of the ...
作者: 王树勇,梅凤翔 (Department of Applied Mechanics, Beijing Institute of Technology, Beijing 100081, China)
出处: 中国物理(英文版) 2002 第11卷 第1期 P5-8
关键词: analytical;mechanics;non-holonomic;mechanics;form;invariance;Lie;symmetry
摘要: In this paper, we study the relation between the form invariance and Lie symmetry of non-holonomic systems.Firstly, we give the definitions and criter ...
作者: 金海,李正元,叶其孝 (Department of Mathematics, Beijing Institute of Education, Beijing 100044, China;School of Mathematical Sciences, Peking University, Beijing 100871, China;Department of Applied Mathematics, Beijing Institute of Technology, Beijing 100081, China)
出处: 数学物理学报(英文版) 2002 第22卷 第2期 P227-240
关键词: Differential;inequality;reaction-diffusion;system
摘要: In this paper, positiveness theorems of solutions for several differential inequalities are proved and are used to prove the existence of traveling wa ...
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