电机转子参数振动的稳定性分析

在工程中 ,两极电机转子等具有矩形截面的轴 ,由于不同方向上的弯曲刚度不同而引起振动 ,即使激振频率远离系统自然频率 ,也可能产生较大响应而造成破坏 ,这就是参数激励共振。所以 ,研究参数激励系统的稳定性及其稳定区域 (范围 )是很重要的。本文以非对称刚度转子和实际电机转子截面轴转动时的弯曲振动为例 ,用Floquet理论研究其振动稳定范围     

面向职业教育的教育技术专业人才技能培养探讨

职业教育的改革与发展需要现代教育技术的支持和参与 ,需要教育技术专业人才的服务。本文通过对职业教育特征的研究和对职教部门的调查 ,分析职业教育对教育技术专业人才的技能水平的要求 ,建设培养技能所需的硬件环境 ,探讨技能培养的方式     

田径类课程设计的若干理论问题探讨

从课程设计角度,探讨了田径类课程定位、课程目标、课程结构、课程实施方案、课程内容、课程评价等诸多课程设计理论问题.     

雅典奥运会女篮强队技术、战术特点的分析

根据常规和专项技术统计以及录像观察对代表此次奥运会女篮强队的前四名球队的技战术进行分析研究.研究发现当前世界女篮优秀球队队员技术全面,全队战术熟练多变;各位置球员除具备各自位置特点之外,均具有灵活、全面、高大、强悍的趋势;各支球队均采用压迫式防守,始终给对手造成巨大压力;全队防守战术明确有效,队员配合熟练默契.     

基于数据融合中Dempster-Shafer证据理论的入侵检测技术

本文先简要的介绍了入侵检测系统的组成和几个应用层次,接着讨论了数据融合技术中的Dempster-Shafer证据理论,并尝试给出了其在入侵检测的身份识别的一个算法和实例.     

中外优秀女子竞走运动员技术参数对比分析

通过对竞走复步的分析,发现中外优秀女子运动员在后摆、前摆、前支撑、后支撑等阶段中的运动学参数存在一定差异,从中发现我国运动员在技术方面存在的不足,学习国外运动员的长处,有利于提高和完善我国女子竞走运动员技术。     

新型工具电极制造方法

用电火花加工复杂形状模腔的关键之一是工具电极的制造。为了解决一般电极材料价高、复杂型腔难以加工等问题,通过试验研究,推出了一种以石膏和塑料为基本材料,采用非金属电镀工艺制造工具电极的新方法。     

A first introduction to archival science

This first introduction, written for educational purposes, is meant to be a concise basic text in which the core concepts of archival science are coherently defined and explained, in a non-polemical way and departing from a de-institutionalised point of view. It is not intended to support or reject any single theory, but to provide an overview. It should be read as a synthesis of a variety of shared ideas and views, not as a manifesto of a new approach to archival science. If there is anything new to it, it might be located in the coherent and integrated presentation. In this primer of archival science annotation has been avoided. The first of several versions of this First Introduction was written in August 1995. It was meant to meet the need of the Netherlands Archiefschool for a basic text on archival science which could support its different programs for archival education and training. After ample discussion with the archival science teachers of the Archiefschool, it was introduced in the 1995/1996 courses. From then on, it has been used in almost all courses and classes on archival science on the undergraduate, graduate and postgraduate levels and in several training and retraining programs of the Archiefschool. The design of the first version has been maintained in all subsequent versions, including this last one. Still, the text has frequently been adapted as a result of discussions with students and colleagues, in and outside the school. This first English version can almost be deemed as a collective product. Of the numerous colleagues who were engaged in this discussion and contributed to the text, special mention has to be made of Peter Horsman, Hans Scheurkogel, Hans Hofman, Eric Ketelaar, Herman Coppens and Kent Hayworth, who commented the English version. For the final text and all imperfections that may still cling to it I am, of course, responsible. An earlier version in Dutch has been published as: Theo thomassen, “Een korte introductie in de archivistiek”, in: P.J. Horsman, F.C.J. Ketelaar en T.H.P.M. Thomassen (red.),Naar een nieuw paradigma in de archivistiek ('s-Gravenhage, 1999), pp. 11–20.     

邓小平理论开辟了21世纪马克思主义发展的道路

马克思主义在150多年发展过程中,经历了马克思主义、列宁主义、毛泽东思想、邓小平理论几个发展阶段。邓小平理论是马克思主义发展的新阶段,新就新在它的研究重点和理论内容重心,由暴力革命理论向经济建设理论转移。21世纪马克思主义的发展,必须沿着邓小理论开辟的道路继续前进,进一步完善社会主义经济建设理论。     

科技与体育——关于新世纪体育科学技术发展问题

阐述了科学技术发展给人类社会带来的影响 ,重点讨论了体育科技的发展趋势 ,分析了我国体育科技事业的现状及存在的问题 ,提出了加快我国体育科技事业发展的对策建议。