Power and energy in linearized physical systems

Although no truly linear physical systems exist, linearized system models are very often used in practice to study the dynamics of real systems and components. Here, the relations between the power and energy in a non-linear physical system and the analogous quantities associated with variables representing small deviations from steady-state values are studied. Sometimes a linearized system is energetically similar to the non-linear system from which it was derived, and in other cases, new types of energy elements appear which were not present in the original system. In order to show the structure of the systems, the results are presented in both equation form and in the form of bond graphs which are unique in exhibiting the power and energy structure of system models.     

试论学习型学校

一定的学校管理模式总是与一定的学校发展水平相适应。当学校发展处于较高阶段的情况下,需要构建学习型学校管理模式,使之与较高层次的学校发展阶段相适应。一所学校的生存与发展并不仅仅是由物质条件和师资水平决定的,学校发展的关键指标--学校的核心精神,起着重要的作用。必须在组织结构和知识载体两方面构建平台,对学习型学校建设提供支持。     

“人的全面发展”内涵新析

把握“人的全面发展”内涵的实质,应确立两个理论前提:第一,“人的全面发展”在很大程度上是一种理想、一种追求、一种社会和人生的信念;第二,“人的全面发展”是一个相对的概念,而不具有绝对的意义。同时,“人的全面发展”还应包含四个层面的内涵,即完整发展、和谐发展、多方面发展、自由发展。     

Response bias in follow-up studies of college students

The problems of response bias in longitudinal studies of college students are examined. An extensive follow-up questionnaire was sent to 1,253 college seniors who had participated in a similar survey as freshman four years earlier. Careful measure of student responsiveness in relation to various techniques designed to increase the proportion of responders (e.g., postcard, telephone contact) were kept.The less responsive groups were significantly different from their more responsive counterparts on nearly a dozen variables representing a wide variety of content areas, including academic achievement, self-concept, alcohol consumption, social deviance, and major choice preferences. Controlling for sex and socioeconomic status served to reduce, but not eliminate, these biases. Overall, the results indicate that researchers cannot account for follow-up nonresponse bias by making statistical adjustments according to data available at initial testing. The results are discussed in light of identifying the reasons for nonresponse, and attempting to develop categories of nonresponders who may be motivated to cooperate by different types of follow-up techniques.     

课程改革与教学模式转变

新一轮基础教育课程改革以空前的力度和崭新的面貌令世人关注,要实现课程改革的预期目标,关键在于教学模式的转变。现行教学模式必须从教师本位向学生本位转变,从独白式教学向对话式教学转变,从封闭式向开放式转变,从传递接受式教学向以引导探究为主要特征的多样化教学转变。     

Impact of cutback planning and management on the poor and minorities in New York City: The case of public education

It is argued that the plight of the dependent-poor is likely to get worse as New York City's fiscal crisis is transformed into a service crisis. Considerable emphasis is given to describing the politics of school closings. The school closure issue has profound implications for any attempts to improve the educational lot of urban schools due to the potential relationship between white flight and school closings. The common tendency to close small and old school facilities located in areas where densities are higher (which minimizes transportation costs) results in schools being closed that are predominantly attended by poor and minority students. Policymakers should be able to learn a great deal about cutback management and planning in general through a better understanding of retrenchment policies which school districts throughout the nation have adopted.Presented at the Annual Meeting of the Association of Collegiate Schools of Planning, Washington, D.C., October, 1981.     

论自主、合作、探究学习

新课程提倡自主、合作、探究学习。自主学习的内涵包括主动性、独立性、自控性,在实践中应处理好教师主导性和学生主体性的关系;合作学习的内涵包括交往性、互动性,在实践中应处理好合作与学习、竞争、独立的关系,教师和学生的关系;探究学习的内涵包括问题性、过程性、开放性,在实践中应处理好"形"和"神"的关系。不能把自主、合作、探究学习形式化、绝对化,要学会全面辩证地看待自主、合作、探究学习。     

课堂交往冲突研究

课堂交往冲突是指当课堂教学活动参与者用相互矛盾的行动路径去达成相同或不同活动目标时所感知到的不一致或相互干扰,它包括三种类型:程序性课堂交往冲突、实质性课堂交往冲突和人际关系课堂交往冲突。课堂交往冲突的作用具有积极和消极二重性。良性人际关系建构、信任重建、沟通重构、协商合作、加深理解以及课堂文化共同体建构等是科学管理课堂交往冲突的基本方法。     

Persistence of Attitudes and Values of NDEA Students-Two Years Post Institute

Eighty-two students who had been enrolled in year-long NDEA Counseling and Guidance Institutes were followed up for a two-year period concerning attitudes and values. Subjects were administered the Porter Test of Counselor Attitudes and the Study of Values. Students attitudes and values similar to those present at the onset of their program and similar to those present after they had been away from their program one year. Some differences were noted concerning end-of-institute responses. Changes occuring during the programs appear minimal. Since there were no differences indicated between the one- and two-year follow-up, one year might be a sufficient period for this type of investigation.