试论增进新疆社会的和谐发展

新疆是一个多民族聚居的边疆地区,民族因素成为影响新疆社会结构的重要因素之一,要促进新疆社会的和谐发展,就要促进各民族之间的和谐,促进宗教与社会的和谐。     

学校体育教学比赛中攻击性行为的研究

学校体育教学比赛中经常出现的运动攻击性行为,主要受学生心理因素及比赛情境因素的影响。体育教学中教师应加强对学生的教育引导,发挥教师言传身教的作用,强化组织管理,以减少和避免运动攻击性行为的发生。     

基于手绘草图的协同概念设计工具研究

将草图交互方式引入到协同概念设计中,以支持多用户快速协作构建产品模型,提出了系统功能模型,提出了面向协同设计的草图信息模型,引入了基于角色的用户访问控制及同步锁机制,并给出了一个原型系统。     

Finite element analysis of internal gear in high-speed planetary gear units

The stress and the elastic deflection of internal ring gear in high-speed spur planetary gear units are investigated. A rim thickness parameter is defined as the flexibility of internal ring gear. Six evenly spaced linear springs are used to describe the fitting status between internal ring gear and the gearcase, The finite element model of the whole internal ring gear is established by means of Pro/E and ANSYS. The loads on meshing teeth of internal ring gear are applied according to the contact ratio and the load-sharing coefficient. With the finite element analysis （FEA）, the influences of flexibility and fitting status on the stress and elastic deflection of internal ring gear are predicted. The simulation reveals that the principal stress and deflection increase with the decrease of rim thickness of internal ring gear. Moreover, larger spring stiffness helps to reduce the stress and deflection of internal ring gear. Therefore, the flexibility of internal ring gear must be considered during the design of high-speed planetary gear transmissions.     

Modern travelling wave based fault location techniques for HVDC transmission lines

The modern travelling wave based fault location principles for transmission lines are ana-lyzed. In order to apply the travelling wave principles to HVDC transmission lines, the special tech-nical problems are studied. Based on this, a fault locating system for HVDC transmission lines is developed. The system can support modern double ended and single ended travelling wave princi-ples simultaneously, and it is composed of three different parts: travelling wave data acquisition and processing system, communication network and PC based master station. In the system, the fault generated transients are induced from the ground leads of the over-voltage suppression ca-pacitors of an HVDC line through specially developed travelling wave couplers.The system was applied to 500 Kv Gezhouba-Nanqiao(Shanghai)HVDC transmission line in China. Some field op- eration experiences are summarized, showing that the system has very high reliability and accu- racy,and the maximum location error is about 3 km(not more than 0.3% of the total line length). Obviously, the application of the system is successful, and the fault location problem has finally been solved completely since the line operation.     

教你正确用(三十六) Writing Tips——英文写作常识(1)

Many readers asked me about how to improve their writing skills.I personally think writingis the most important and also the most difficult part in learning English as a second language.Today,we'll talk about some basic rules in English writing.If,somehow,your teacher taught youthings that are different from what I am going to tell you below,please follow your teacher,because she or he is the one who will grade your paper.     

教你正确用(二十九)—美国的节假日(下)

In Part One of this series on holidays, we talked about important holidays up to the month of September. Today, as promised, we'll pick up where we left off and take a look at holidays in the fall and winter months.……     

我国社区学院发展初探

社区学院从在美国兴起至今已有百年历史,是构建学习型社会和终身教育体系的重要载体。我国社区学院的发展应定位于立足社区、服务社区,实现高等教育大众化,提供终身教育。结合其开放式、公平化和灵活性的特点,契合我国国情,当前应当加快立法,完善制度构建,多渠道、有针对性地创办我国社区学院。     

美国先进技术计划(ATP)管理模式分析

国家科技计划是中央政府有目标、有步骤、有组织、有措施地在全国范围内开展科技研发活动的基本组织形式,是国家执行其科技政策的基本工具,是体现国家意志、弥补市场不足、实现科技资源合理配置的重要手段。本文根据国家科技计划的基本分析方法,论述了美国先进技术计划的产生背景,及其战略定位。说明了美国先进技术计划的基本管理模式,最后分析了美国先进技术计划对美国经济的影响。