The evolution of liquid and gas centrifuges

Although the principle of separation by centrifugation has been known for nearly a century, the technical difficulties of using it in practice are very great. Only in comparatively recent years has there been sufficient understanding of the underlying theory, and availability of suitable materials of construction, for the high-speed centrifuge to be used as a powerful aid to medical research and, very recently, as a means of separating isotopes on an industrial scale.     

Participation and equity towards a sociology of policy language in education

The problem of making education policies explicit and context independent is addressed in this paper. As a vehicle for discussion the paper examines a contemporary policy that has major shortcomings in the explicitness of its language: Australia’s “Participation and Equity Program”, a policy directed at increasing access to education by post-compulsory level students. Problems in making policies explicit and context independent are discussed. Policies are seen as complex messages whose meanings can become scrambled for implementers remote from the language community of policy framers. The links between speech communities and the limited contexts of policies are examined. The paper suggests the inauguration of a sociology of policy language in education to assist in policy design and dissemination. Its concluding sections recommend the kinds of applied work that that sub-discipline might engage in and strategies for improving the explicitness of policy language generally.     

包畹蓉的"戏服王国"

今年1月,日本早稻田大学演剧博物馆馆长竹本干夫专程来到上海奉贤区包畹蓉的家里,看了包先生收藏的戏服,连声赞叹,希望往后不断地相互交流和合作;4月8日,上海市邮政局的领导来到包畹蓉家里,要将他收藏的戏服拍成照片,将它印在迎接2010年上海世博会的明信片上……     

A role for message TV in education

Conclusion The role of message TV in education will change with advancing technology and improving instructional design. As a stand alone activity, message TV may be too subjective an experience with too short a duration to expect enduring attitude and value changes. More research into the use of the medium as a stand alone activity is required. However, since message TV is a more effective medium for impressing with images than transmitting abstract data, it can play the affective instructional role as the strategic component within a program that uses a variety of activities to facilitate attitude and value cultivation. Message TV is a very powerful tool for persuasion that illustrates, dramatizes, and makes concrete the program’s objectives. Both of these productions operate on budgetary demands typical of educational institutions: resourcefulness, innovation, and dollar s-t-r-e-t-c-h-i-n-g. Our computer graphics are created on an Omega 500 with extra memory and a genlock device. For special effects we use a Chinon CV-T70 VHS Camcorder camera with special digital effects. This equipment belongs to our talented videographics creator, Rex Suba, who teaches high school media production. He gave a showcase presentation at AECT’s 1988 convention entitled “Desk Top Video: Low Cost Choice For Instruction” and demonstrates the innovative educational applications of his affordable equipment.     

Teachers and artificial intelligence. The Logo connection

This article describes a three-phase program for training special education teachers to teach Logo and artificial intelligence. Logo is derived from the LISP computer language and is relatively simple to learn and use, and it is argued that these factors make it an ideal tool for classroom experimentation in basic artificial intelligence concepts. The program trains teachers to develop simple demonstrations of artificial intelligence using Logo. The material that the teachers learn to teach is suitable as an advanced level topic for intermediate- through secondary-level students enrolled in computer competency or similar courses. The material emphasizes problem-solving and thinking skills using a nonverbal expressive medium (Logo), thus it is deemed especially appropriate for hearing-impaired children. It is also sufficiently challenging for academically talented children, whether hearing or deaf. Although the notion of teachers as programmers is controversial, Logo is relatively easy to learn, has direct implications for education, and has been found to be an excellent tool for empowerment-for both teachers and children.     

Computers in Third World schools: the example of China

The introduction to this article discusses a dilemma facing many Third World countries: should they place computers in their schools and, if so, for what purposes? The author outlines four common rationales—the Social, Vocational, Pedagogical and Catalytic—and refers to two less common ones—the Information Technology Industry and Cost-effectiveness Rationales. The main text describes policy in China at national level, and analyses policy and practice in Beijing City and Zhejiang Province. The paper is based on an international co-operative study of computers in African, Asian and Arabic- speaking schools, funded by the Harold Macmillan Trust.     

A SECOND LOOK AT ANALYSIS OF VARIANCE ON DICHOTOMOUS DATA

The work of Lunney (1970) concerning the appropriateness of analysis of variance (ANOVA) techniques on dichotomous data is discussed and extended. Relations between standard statistical techniques for analyzing dichotomous data and ANOVA procedures are indicated. The need for usefulness of analyzing transformed data as opposed to direct analysis of dichotomous data are discussed. Required statistical procedures employing transformed data are outlined.