使用O型密封圈应注意的问题

主要介绍了O形密封圈的静密封和动密封的工作原理,以及使用O形密封圈应注意的几个问题。     

磁动势法五相永磁力矩电机转矩分析

五相永磁力矩电机由于极数与槽数相近,含有丰富的磁动势谐波,磁动势谐波会影响电机的转矩性能。为此,采用磁动势法分析电机的电磁转矩,通过磁能和虚位移原理推导出了电机电磁转矩的解析表达式,揭示了具有相同空间次数的定子和转子磁动势谐波相互作用才能产生电磁转矩的规律。通过对五相永磁力矩电机的定、转子磁动势谐波与电磁转矩关系的分析,指出与与主波转速一致的定子和转子磁动势谐波相互作用能提高五相永磁力矩电机的平均电磁转矩。利用Ansoft有限元软件仿真分析了电机在正弦波、梯形波和方波供电下的定子磁动势、转子磁动势以及转矩性能。结果表明,非正弦供电能够增加电机的电磁转矩,但也带来了转矩脉动,验证了磁动势法分析五相永磁力矩电机转矩的有效性和正确性。     

国外城镇用地扩张的控制

以英美为例，对国外城镇用地扩张控制的动机和措施进行了探讨。国外城镇用地扩张控制的动机主要体现在五个方面，减少交通堵塞、降低环境污染，保护城郊农地、保护社区现有的生活方式、防止中心城区继续衰退。国外城镇用地扩张控制的政策措施主要包括：城镇规划制度、农地区划政策、土地开发许可制度、土地供给计划、公众参与、税收政策、公共资本投资、转移土地开发权。     

当代大学生读书选择动因探析

大学生读书选择趋向，不仅体现着校园的时尚，而且折射着大学生的心态。高校领导应重视加强大学生文化选择和文化消费的趋向引导，以促进大学生身心健康成长和完美人格的塑造。     

思想政治教育与创新人才非智力因素发展

创新人才的思维发展与非智力因素有着紧密的联系,通过分析创新人才的动机、意志、情感和人格等非智力因素,论述思想政治教育对这些因素的积极影响.     

抑爆系统高压动力源中气体发生剂的实验研究

针对地下及半地下建筑抑爆系统高压动力源产气剂研究的需要，自行设计了气体发生剂密闭爆发实验装置，测定了在同一剂量下的不同气体发生剂反应时的P-t曲线，由此对各气体发生剂燃烧时的产气规律进行了分析，得到了一个最佳配方，并对各气体发生剂产气的影响因素进行了研究。     

越肩发射式空空导弹初始转弯段研究

对不同导引规律、发射方式、动力系统对初始转弯段的影响进行了分析,得到相关结论,并建立了导弹模型,通过数字仿真结果验证了该结论.得到的相关结论可用于越肩发射式空空导弹系统设计.     

Non-economic motivations for organizational citizenship behavior in construction megaprojects

This study examined the primary non-economic motivations behind participating entities' organizational citizenship behavior in construction megaprojects, referred to as their megaproject citizenship behavior (MCB), in terms of altruism and observed practice. A questionnaire-based survey designed to test the effect of non-economic drivers on MCB revealed that the pursuit of social value and self-serving motivation, including firm development and political appeal, function as significant non-economic drivers of MCB. And the self-serving motivation to perform MCB is generally less significant than the pursuit of social value, and the relationship between self-serving motivation and MCB is partially moderated by the governmental connections of the megaprojects. In government-hosted construction megaprojects, when the governmental connections of the individual participating entity are as strong as those of the megaproject itself, MCB engagement is actually driven by the pursuit of firm development and political appeal even where the apparent driver is the pursuit of social value.     

Impressions of Milgram's obedient teachers: Situational cues inform inferences about motives and traits.

The research investigated impressions formed of a "teacher" who obeyed an experimenter by delivering painful electric shocks to an innocent person (S. Milgram, 1963, 1974). Three findings emerged across different methodologies and different levels of experimenter-induced coercion. First, contrary to conventional wisdom, perceivers both recognized and appreciated situational forces, such as the experimenter's orders that prompted the aggression. Second, perceivers' explanations of the teacher's behavior focused on the motive of obedience (i.e., wanting to appease the experimenter) rather than on hurtful (or evil) motivation. Despite this overall pattern, perceptions of hurtful versus helpful motivation varied as a function of information regarding the level of coercion applied by the experimenter. Finally, theoretically important relationships were revealed among perceptions of situations, motives, and traits. In particular, situational cues (such as aspects of the experimenter's behavior) signaled the nature of the teacher's motives, which in turn informed inferences of the teacher's traits. Overall, the findings pose problems for the lay dispositionism perspective but fit well with multiple inference models of dispositional inference. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于PXIe和LabVIEW的动物运动力学数据采集系统

为了解决动物运动力学数据采集系统中的多通道、高采样率和大量数据实时存储等问题,提出了一种基于虚拟仪器技术及其图形化开发环境的系统设计方案。系统以PXIe和LabVIEW为平台,采用3×8传感器阵列、72通道数据采集与处理模块和高速摄像机等,同步采集力学数据和图像数据。实验表明,该系统可以准确获得动物运动过程中各个脚掌的三维接触反力和协调运动行为数据,为仿生机器人的研究提供了理论基础。