电机转子参数振动的稳定性分析   总被引：1，自引：0，他引：1  

陆鹏  叶黔元 《上海海事大学学报》2001,22(3):183-186

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  相似文献   

田径类课程设计的若干理论问题探讨   总被引：7，自引：0，他引：7  

许世岩 《北京体育大学学报》2005,28(8):1113-1116

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.  相似文献   

基于数据融合中Dempster-Shafer证据理论的入侵检测技术     

叶苗 《广西大学梧州分校学报》2005,15(3):98-99

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.  相似文献   

少数民族贫困乡社会经济发展研究——云南省临翔区南美拉祜族自治乡社会经济发展调查分析     

李建华  杨元美 《临沧师范高等专科学校学报》2006,(1)

以南美拉祜族自治乡为典型,追溯本土拉祜族社会发展历史,结合国家级贫困乡社会经济发展现状,剖析其发展滞后的原因,寻求少数民族贫困地区社会进步、经济发展的新途径,促进云南边疆、山区、贫困民族自治乡的扶贫开发。  相似文献   

A first introduction to archival science   总被引：1，自引：1，他引：0  

Theo Thomassen 《Archival Science》2001,1(4):373-385

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.  相似文献   

运动员人格特征与赛前焦虑、心境状态的相关关系   总被引：6，自引：0，他引：6  

左从现 《上海体育学院学报》2002,26(2):71-75

采用测试研究方法，分析了人格特征与运动员的竞赛焦虑和心境状态的相关关系。结果表明，不同人格特征运动员之间在比赛期间存在显著的竞赛焦虑和心境状态差异；比赛期间躯体焦虑比认知焦虑更能影响运动员的潜能发挥；心境状态是运动员竞赛焦虑的有效预测因子。  相似文献   

Correlates of verbally aggressive communication in adolescents     

Charles Atkin  Sandi Smith  Anthony Roberto  Thomas Fediuk  Thomas Wagner 《Journal of Applied Communication Research》2002,30(3):251-268

This investigation identifies demographic, media, and social correlates of verbally aggressive communication in adolescence. Mail surveys were completed and returned by 2,300 adolescents between the ages of 13 and 15. These adolescents were asked about the prevalence of verbal and physical aggression, the context in which it occurred, demographics, and the interpersonal and media influences in their lives. The results indicate that verbal aggression is widespread, that committing and experiencing verbal aggression is largely reciprocal, that there is a strong relationship between committing verbal and physical aggression, and that peer social influence and listening to violently oriented music are mildly related to verbal aggression in adolescents. These findings suggest more resources should be allocated to teaching adolescents to understand and control verbal aggression. Further, they provide important answers to many prevention and intervention programmatic questions, including context, content, and targeting concerns. Since the negative consequences of verbal aggression are severe and long lasting, decreasing this destructive communication behavior should significantly improve the lives of many adolescents. These and other practical implications are expanded upon and discussed.  相似文献   

邓小平理论开辟了21世纪马克思主义发展的道路     

曹能国 《黄冈职业技术学院学报》2002,4(2):87-90

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。  相似文献   

析体育理论课程测验的质量指标     

沈钧毅  张宗豪 《山西师大体育学院学报》2003,18(3):36-37

根据教育统计学讨论了评价体育专业学生理论课程测验的四个质量指标。这些指标都可以通过统计的方法加以量化，有了这些指标，就可以比较客观地反映教育测验的质量。  相似文献   

从对蹬冰加速理论的质疑点看克莱普冰刀的设计构想   总被引：10，自引：3，他引：7  

陈民盛  覃晓红 《天津体育学院学报》2003,18(2):30-32

从对蹬冰加速理论的质疑点角度，探讨了克莱普冰刀的设计构想。结果表明，克莱普冰刀的设计思想不仅仅是延长了蹬冰时间、提高了踩关节的灵活性、加大了蹬冰腿膝关节的伸展范围、保持了城关节的平稳移动，更重要的意义在于揭示重心沿滑行方向上的前移作用。它改变了以往人们对加速理论中，只有在与滑行方向水平面内相垂直的蹬冰力才对加速起贡献作用的传统认识，暗示出在滑行方向上切向和法向速度均对重心的加速起作用的观点。  相似文献