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The paper discusses how the concept of switchingtype servosystems can be introduced into an undergraduate curriculum without requiring a more advanced background in mathematics on the part of the student than is ordinarily expected. A differential equation approach is used to study the response of a second-order system which is excited with a step function input. The system starts to respond in a linear mode of operation with an over-all positive feedback and switches into a different linear mode with an over-all negative feedback at a predetermined instant. The system is designed so as to respond with no overshoot. The response time is shorter than that of a conventional critically-damped linear negative feedback system with the same major physical components. The results of a rigorous study by means of a phase-space representation are also given. 相似文献
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Toward an alternative evaluation policy for Kibbutz schools 总被引：1，自引：1，他引：0
Zvi Lavi 《Interchange》1982,13(1):92-96
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This study explores the potential of an online platform that encourages journalists to post the documents behind their news stories to help restore the deteriorating public trust in news media. Based on content analysis of 200 news items and 315 accompanying documents posted on DocumentCloud, findings indicate that contrary to journalists’ traditional reluctance to rely on documents, the platform succeeds in boosting massive use of documents, both by mainstream and alternative journalists. Findings show that documents serve mainly to support factual claims (in 96 percent of items) and enhance the transparency of news processes, allowing audiences’ unmediated access to raw materials, and greater capacity to evaluate information independently. However, there are no apparent signs that journalists verified the content of the document. The article suggests that DocumentCloud is a unique example of a technology that may succeed where the former technology that promised to serve as a journalistic reference system, hyperlinks, had failed. If the DocumentCloud experiment is implemented on a wider scale, it might have serious theoretical and practical implications, which are discussed here. 相似文献
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Zvi Lamm 《欧洲师范教育杂志》1986,9(3):233-245
After presenting the essential principles relevant to the education of teachers, according to which the Israeli educational system is organised, the article examines teacher education patterns in the various institutions in Israel. These are divided into institutions for the education of teachers in nursery schools and elementary schools run by the State, and schools of education in the universities which train teachers for secondary schools.
Ideological concepts divide the institutions of both kinds into those that train teachers for religious and non‐religious nursery schools and elementary schools.
The teacher training institutions in Israel (together with the whole educational system) have been immersed, during recent years, in a process of reform which reflects the changes that Israeli society has undergone since the establishment of the State. 相似文献
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The goal of this study was to identify and understand the mental models developed by 67 high school biology students as they learn about the human body as a complex system. Using concept maps, it sought to find an external way of representing how students organize their ideas about the human body system in their minds. We conducted a qualitative analysis of four concept maps created by each student throughout the 3-year learning process, which allowed us to identify that student’s systems thinking skills and the development of those skills over time. The improvement trajectories of the students were defined according to three central characteristics of complex systems: (a) hierarchy, (b) homeostasis and (c) dynamism. A comparative analysis of all of our students’ individual trajectories together revealed four typical learning patterns, each of which reflects a different form of development for systems thinking: “from the structure to the process level”, “from macro to micro level”, “from the cellular level to the organism level,” and “development in complexity of homeostasis mechanisms”. Despite their differences, each of these models developed over time from simpler structures, which evolved as they connected with more complex system aspects, and each indicates advancement in the student’s systems thinking. 相似文献
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The relationship between “marginal” and “mainstream” science has, in recent decades, become a matter of discussion. Traditional perspectives must be reexamined in the wake of transformations in the international circulation of knowledge and the subsequent diversification of scientific “peripherality”. Argentina represents an interesting case with which to explore the structure of “peripheral centres” and new forms of scientific development. While it has recently experienced an expansion in terms of institutionalization, professionalization, and internationalization, that process has been coupled with entrenchment of existing institutional asymmetries and persistent intra-national inequalities; academic prestige is distributed according to opposite principles of legitimation (local/international). Our main task is to explore the current state of research capacities pursuant to that expansion in order to analyze the diverse styles in which knowledge is produced. In our analysis, we make critical use of Bourdieu’s concept of field and the Latin American category of “structural heterogeneity,” while also focusing on the question of circulation. The paper outlines how professionalization has developed locally over time, and the historical tension between the National Council for Scientific and Technical Research and the public universities. It describes the current structure of the scientific field in terms of researchers, institutes, publishing circuits, and institutional evaluative cultures. It focuses on geographical asymmetries in order to assess the distribution of new human and material resources throughout the country. Finally, it addresses the current situation under the new government, and raises concern over recent regressive actions. 相似文献
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Bekerman Zvi 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2020,66(1):115-118
International Review of Education - 相似文献