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At the turn of the last century there was an ever increasing world demand for pearls while at the same time their known fishing grounds were becoming exhausted. Some way of artificially increasing their production was obviously desirable, and the problem attracted considerable effort. It was an attempt to exploit a scientifically poorly understood phenomenon, and it is interesting, in retrospect, to relate these attempts to recent concepts of biomineralisation. Pearls are, of course, the layers of aragonitic calcium carbonate secreted by molluscs.  相似文献   
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A kindergarten class of 9 boys and 11 girls took the 1986 Stanford-Binet Intelligence Scale (Fourth Edition) and the Wechsler Preschool and Primary Scale of Intelligence. Of 6 correlations of total scores and subtest pairs, only the correlation of total scores was statistically significant (p<.01).  相似文献   
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ABSTRACT

Collaborative school cultures have been associated with the achievement of a number of school reform objectives for both teachers and students. Little is known, however, about how such cultures develop and whether or how school administrators can facilitate that process. This study examined the practices of administrators in each of 12 schools which had developed highly collaborative professional relationships over a three year period in the context of school improvement initiatives. Results suggest the feasibility of developing more collaborative school cultures in a relatively brief period of time and clarify the role played by the larger context of school improvement for fostering collaboration. Specific strategies used by the administrators are described. These strategies are associated with a concept of leadership termed “transformational”.  相似文献   
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A review of research relating to the problem of using research findings to improve classroom practice is presented. There are two aspects to this problem: familiarizing teachers with relevant research and identifying an aspect of teaching that needs to be improved. Research conducted in local settings appears to have most relevance to teachers and is more likely to be accepted by them. Studies indicate that research can have an impact on practice as long as teachers are involved in identification of problems in their class and are provided with a context in which they can learn the strategies to be implemented and understand why they are likely to improve teaching. Teachers need opportunities to practice teaching in peer groups where errors can be made without jeopardizing student learning; receive performance feedback; practice the strategies in their own classes; observe others teach; and discuss teaching with others. Strategy analysis, coaching and peer coaching are techniques which enable most of these criteria to be met and to facilitate science teaching improvement.  相似文献   
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This article reviews a number of claims made by postmodernist writers on the education of adults, who deny the existence of objective truth. It is argued here that such claims are asserted without supporting evidence and that they fail to take into account the semantic structures of language and actual linguistic usage. The article tries to show that analysis of semantic structure reveals a concept of truth embedded and presupposed in language and that truth and meaning are interrelated.  相似文献   
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This study investigated the sense of belonging of part-time students through interviews with 53 novice or experienced students enrolled in part-time programmes in Hong Kong. It was found that students were more easily able to affiliate with their class groups or teaching staff than with their department or university. Seven methods are suggested for promoting a sense of belonging. Class cohesiveness can be developed through learning activities and maintaining classes as a cohort. Relationships with teaching staff can be developed through encouraging interaction, providing good quality teaching and making a positive initial impression. There was also evidence that a sense of belonging was more likely to develop if enrolment was through departments and part-time students had access to resources and facilities. The data showed that promoting a sense of belonging contributed to better quality learning outcomes and increased the chances of students completing programmes.  相似文献   
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