正多边形一个性质的推广

运用向量方法，将陈永济同志的《关于正多边形一个有益性质的发现和证明》中的结论一正n边形内和边上任一点，到各边距离之和等于nm(m是正n边形的边心距)，推广到一般平面多边形和空间多面体中，得出：定理1平面多边形的面积等于平面上任一点，与多边形构成的三角形的定向面积之和。定理2空间多面体的体积等于空问中任一点，与多面体各个面构成的棱锥的定向体积之和，及其推论1和2。     

远程教育交互理论和实践研究的发展

交互性是社会学研究的一个重要范畴，也是教育领域十分关注的一个概念。对交互思想的演化以及远程教育中的交互理论和实践研究的发展进行系统的阐述，有利于当前开展的网上远程教育交互理论的研究。     

The virtual class is coming

A long term action research programme initiated in 1987 by the Department of Communication Studies at the Victoria University of Wellington, New Zealand, is seeking to develop a virtual class. The virtual class is regarded as the critical component of a new educational paradigm for an information society. The action research programme takes the form of a spiral of cyclical attempts to create a virtual class. Each attempt is seen as a syntagmatic episode of a virtual class paradigm attempted in the light of an existing paradigm. The results of each syntagmatic episode are seen as influencing the further development of the paradigm.     

Legacies in Black and White: The Racial Composition of the Legacy Pool

Selective universities regularly employ policies that favor children of alumni (known as legacies) in undergraduate admissions. Since alumni from selective colleges and universities historically have been disproportionately white, admissions policies that favor legacies have disproportionately benefited white students. For this reason, legacy policies lead to additional costs in terms of reductions in racial diversity. As larger numbers of minority students graduate from colleges and universities and have children, however, the potential pool of legacy applicants will change markedly in racial composition. This analysis begins with a review of the history and objectives of the preference for children of alumni in undergraduate admissions. We then consider the specific case of the University of Virginia and employ demographic techniques to predict the racial composition of the pool of potential legacy applicants to the university. Significant changes in the racial composition of classes that graduated from the University of Virginia from the late 1960s through the 1970s foreshadow similar changes in the characteristics of alumni children maturing through the next two decades.     

现场总线与智能工程--控制仪表的发展趋势

本文简单回顾了自控系统的发展历程,重点论述了现场总线及智能工程的发展现状并讨论了两者结合对自控技术可能产生的影响及应用前景.     

小孔成像在中国古代之研究

通过对古代有关小孔成像的观察和实验记载的分析，阐明了中国古代学者在光学发展的初期所作的贡献，同时也指出由于轻理论而重现象的定性描述使得在光学上的成就远落后于西方的历史教训。     

湘桂黔省际边区民族经济与县域经济发展

湘桂黔省际边境区域是少数民族集中居住地和贫困县聚集地,经济发展水平非常落后。通过转变思想观念,加强区域间的合作,加快个体、民营经济的发展,构建绿色产业经济,壮大旅游产业等途径,从而加快区域内民族经济和县域经济的发展,其意义十分重大。     

教育技术培训造就远程教师

以现代教育技术尤其是计算机网络技术为技术特征的现代远程教育正在蓬勃开展，依赖现代教育技术条件环境开展的远程教学对教师提出了新的要求。应当对参与远程教育的教师进行教育技术培训，以提高其应用现代远程教育理论与技术条件开展远程教育的能力，造就适应运程教育需要的“远程教师”。     

目标练习法在中长跑教学中的应用

本文就提高学生耐久跑成绩的练习方法进行研究，通过分析、比较，提出适合中学生耐久跑教学的目标练习法，对增强教学环节、促进学生成绩提高有较好的作用。     

浅析现代远程教育中地县级电大教师角色的转变

伴随科技信息时代的发展，现代远程教育成为一种新型教育方式，冲击着传统,贡时对电大教师的角色转变提出全新的要求，本从远程教育的教学模式出发，谈地县级电大教师角色的转变。