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1.
Objective: To determine whether information retrieval might be enhanced by making each component of a structured abstract a separately searchable field. Design: Parallel searches on records arranged so that each abstract could either be searched in its entirety or as a collection of structured fields. Subjects: Records about cardiovascular disease downloaded from MEDLINE and tested against clinical questions derived from a concurrent survey of CD-ROM use in three health science libraries. Intervention: The investigators identified terms used to structure abstracts on MEDLINE and imported the abstracts into an Idealist database prior to searching using keywords from clinical questions. Measurements and main results: recall and precision rates are given for each question in the ‘structured’ and the ‘unstructured’ set of records. Conclusions: Use of structured, rather than unstructured, abstracts improves precision at the ex-pense of recall and places heavier demands upon the searcher’s skill in choosing the correct fields within the abstract to search. Further investigation requires more accurate simulation of MEDLINE software that utilizes features such as MeSH terms, explode, facilities and delimiters.  相似文献   
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Abstract

This paper involves a search for interracial entanglements in South African sport and considers how these experiences may be narrated. The paper comprises three sections. The first provides an overview of traditional narratives of apartheid and apartheid sport that focus on race as a perpetual marker of social division. The second section shifts attention to the gaps, blind spots, mistakes, paradoxes, ironies, anomalies, ambiguities and invisibilities in the structures of apartheid that allowed for racial encounters and entanglements. The paper concludes with a discussion about the methodological and political implications of incorporating racial entanglements into narratives of apartheid sport.  相似文献   
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数学教学中的开放式教学——创造一种课堂数学文化   总被引:5,自引:4,他引:5  
数学教学中需要对开放式教学进行合作研究。在日本的开放式教学中,数学问题被选择是用来说明一个问题的多种解法或多个正确答案。数学教学要实现一种全新的课堂数学文化,这种数学形式的特点是:问题开放、解决问题的过程开放、构建问题开放、评价开放,使学生能自由地思考,发展学生的思维能力。  相似文献   
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Lapides, J. “Teaching styles in adult education. An exploratory essay,” Revue ATEE Journal 3 (1980) 191‐205.

Two approaches to teaching styles are explored. The first is a static approach borrowed from management research and organizational development practice. In this approach teaching styles were derived from Maslow's hierarchy of needs. They were seen as the interpersonal styles of behavior with others, which grow out of people's needs. Seven teaching styles were identified and described. The second approach, in contrast with the life‐style approach, is based on the assumption that teachers can be trained in alternative styles. Mosston believes that everyone can change through learning and that teaching style is a learned characteristic. Seven styles from command to discovery have been identified and described. Suggestions for teacher training are included.  相似文献   

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Psychologists and mathematics educators have long viewed flexibility as critical to students’ mathematical development. In this paper, we focused on the multidimensional nature of flexibility to better understand how preference, knowledge, and use of effective methods for solving algebra problems are related. In Study 1, we identified research-based aspects of flexibility with algebra and assessed students on them following a two-step equations unit. Results indicated that certain aspects of flexibility develop prior to others and that prior knowledge of algebra plays a significant role in that development. Study 2 confirmed and elaborated on these results using a larger sample size. Implications for theory and for supporting flexibility in classrooms are discussed.  相似文献   
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Attachment relationships of toddlers (N = 45) to their child-care providers were investigated. Children's behaviors with their mothers were observed at home at 24 months and with their child-care providers at 26 months. Attachment Q-Sort procedures were used at home (90 items) and in child care (78 items); the latter yielded a 15-item Safe and Secure Scale describing the safe haven and secure base functions of attachment relationships in child care—being able to (a) seek and receive positive attention, (b) feel safe and protected, (c) receive support for exploration, (d) receive consolation when distressed, and (e) seek and accept assistance. Independent observational measures of child-care quality also were obtained at 24 months. As hypothesized, the Safe and Secure Scale was related to proximal rather than distal indicators of child-care quality, and it was a stronger measure than the child-caregiver Q-security score that was based on all 78 items. Child-mother and child-caregiver security were significantly related.  相似文献   
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