Approximate Tangent Plane Method for Calculating Surface Deformation in Elastic Contact Problems

lintroductionThenumericalsolutionofsurfacedeformationinthi-eedimensionalelasticcontactproblemsisthebasisofanalysisofnon-HertziancontactproblemsandtwodimensionalEHLproblems.Mostnumericalmethodsofsurfacedefol.lnationcalculationsubjectedtoanolinalpressuredis…     

篮球运动中身体接触的分析与运用

在篮球运动中，犯规是困扰教练员、运动员的一个难题，而犯规主要是由不合理的身体接触造成的。身体接触在新旧规则中的变化说明，合理的身体接触在于位置、时间、距离、动作的使用时机。     

Influence of the ambient air temperature on the electrical contact reliability of electromagnetic relay

The dynamic contact resistances of HH52P electromagnetic relays are measured under different ambient air tem- perature. Their diagnostic parameters are extracted and determined. It is found that the ambient air temperature obviously influ- ences some parameters. In order to research its influence on the electrical contact reliability of electromagnetic relay, the statistic analysis is applied to study the static contact resistance, the max of the dynamic contact resistance and the bounce time. It is found that the ambient air temperature regularly influences the three parameters. Thoroughly, the phenomenon is studied and analyzed in the point of material science so as to probe into the essential matter of it.     

试论远程教育中友情链接和情感交互

交互的阙如是远程教育的一个缺陷,因此在传统远程教育中一直缺少对学生的人文关爱,这既有技术上的因素,更有观念上的缘故。现代信息技术的发展已初步解决了现代远程教育交互的技术问题,这样,如何在远程教学和远程学习中实现以人文主义关怀为特征的友情链接与情感交互,就成为当前现代远程教育中值得深入研究的重要课题。     

Interracial Contact in High School Extracurricular Activities

Using data from yearbooks for 193 high schools, this study examines the degree of interracial contact in 8,849 high school teams and other organizations. More than one-third of these groups were all-white, while only about 3% were exclusively nonwhite. Owing in large part to their overall numerical preponderance, white students rarely found themselves outnumbered in groups by as much as three to one; by contrast, nonwhites often were in this position. Tabulations show that the degree of interracial exposure was typically less than what would occur if all organizations in each school had been racially balanced and was much less than the exposure that would have occurred if all organizations reflected the racial composition of the schools containing them. Whereas the nonwhite percentage of the students enrolled in the sample high schools was 24.9%, the membership of clubs and teams was 20.7%, reflecting a lower rate of participation by nonwhites. Furthermore, because the racial compositions of clubs and teams were not uniform, the average white member was in an organization that was only 15.3% nonwhite. Although clearly less than its theoretical maximum, this rate of contact nonetheless appears to be much higher than what would occur if friendships were the only vehicle for interracial contact outside the classroom. Finally, the extent of segregation associated with these organizations was the same or less in the South than in the rest of the country.     

一个基于主手的力觉再现和反馈的机器人仿真系统

介绍了基于5自由度力觉再现装置的虚拟力觉仿真系统的实现方法．此系统中，操作通过主手控制虚拟环境中的从手与虚拟物体相作用，虚拟环境中的接触情况如碰撞响应、形变在图形界面仿真，虚拟力通过主手装置表达．该研究有利于提高遥操作机器人的性能和增强操作的沉浸感．     

An analysis of social class differentials in parent-initiated contact with teachers

This article analyses the association between social class and parent-­initiated contact with teachers. Hypotheses are derived from Lareau’s theory on ‘concerted cultivation’ and status maintenance theory on rational educational decision-making. Data from a national survey on French students traversing secondary school are used to study social class differentials in parents’ involvement in Grade 9 when students are about to proceed to an important transition from lower to upper secondary school. Linear probability models reveal that the likelihood that parents initiate meetings with teachers decreases as students’ performance increases and that concerted cultivation beliefs have positive effects. Through inclusion of interaction terms into the models, clear evidence is provided that middle-class parents are more likely to seek a meeting than working-class parents when their children face difficulties.     

色彩静物写生教学的道具选择与组合

全文从内容、色彩、形体、质感、对比与统一五个方面论述色彩静物写生教学中关于道具的选择与组合规律,其核心观点是:物体间的合理联系是静物摆放的基础     

Student teachers in the contact zone: developing critical intercultural ‘teacherhood’ in kindergarten teacher education

This paper reports on the results of a narrative-grounded investigation ofstudent teachers' intercultural experiences and learning during their teaching practice. Our interest is in the meaning of the intercultural contact zone and how education for diversities is conceptualised and reflected upon in Finnish teacher education. Critical event narratives were collected from 10 kindergarten student teachers' teaching practice portfolios where the focus was on observing and reflecting on diversities in education. Theoretically, the study relies on Pratt's theory of contact zone. The methods and conditions for supporting student teachers' understanding of diversities in teacher education are discussed.     

群际接触理论视角下藏区民汉合校交往问题研究

藏区民族团结是我国民族工作一个特别的重点。依据群际接触理论,考察藏区一所民汉合校师生交往情况,研究发现:学校管理呈现"民管民""汉管汉"的现象;汉族教师和藏族教师在工作、生活领域交往较少;师生交往侧重关注教学等工具性目标实现,忽视学生作为个体的"人"的价值关怀;混合编班的不同民族学生建立了良好的族际友谊;民族班与混合编班的学生有交往的动机。因此,需要逐步推进民汉合校管理一体化,构建公平、公正的管理制度,搭建促进不同民族师生交往、交流、交融的平台。