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Decades of research produced inconsistent findings on whether study time can lead to achievement gains in mathematics. Data generated by more than six thousand students from three different countries who solved more than 1.1 million problem sets using a dedicated mathematics software are analyzed regarding the effect of study time on students’ achievements in mathematics. Results showed that more study time led to higher performance scores in mathematics. Further analyses revealed that low-performing students in the first school year (2017-2018) who increased their study time in the following year (2018-2019) revealed greatest gains in performance in the same school year (2018-2019) and even in the year after (2019-2020). Finally, results replicated previous observations of robust performance scores within students over the three school years, with performance scores in 2017-2018 predicting those of 2018-2019 which predicted those of 2019-2020. These results support the idea that students, in particular low-performing students, can boost their academic abilities to upper levels when increasing their study time.

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Journal of Mathematics Teacher Education - This study examined elementary and secondary prospective teachers’ (PTs’) abilities to analyze a classroom lesson in order to make claims...  相似文献   
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Physical activity is not only beneficial to physical health but also to cognitive functions. In particular, executive functions that are closely related to learning achievement can be improved by acute and recurring physical activity. We examined the effects of a single 30-min physical education program in contrast to a 5-min movement break on working memory, cognitive flexibility, and inhibition of attention and behavioral tendencies of eighty-one 13- to 14-year-old students in grade 7 in Germany. Results indicate that the maintenance of on-task attention in the face of distraction was improved by an aerobic endurance exercise-based physical education program but not by a short aerobic movement break. This suggests that the duration of a school sports program is decisive for improving students' executive attention.  相似文献   
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This study investigated the effects of a classroom intervention on prospective elementary teachers’ ability to evaluate evidence of student achievement of mathematical learning goals. The intervention was informed by a framework for teacher education which aims to provide prospective teachers (PTs) with the skills needed to systematically learn from their own teaching practice. Prospective teachers (N = 160) participated in an intervention aimed at addressing their misconceptions about evidence of student learning. Results revealed that after the intervention, PTs were less likely to consider teacher behaviors to be evidence of student learning and more likely to discount student responses that were irrelevant to a specified learning goal. However, PTs were still likely to take procedural fluency as evidence of conceptual understanding and may have become overly skeptical of student understanding. Implications of the study suggest new ways of developing prospective teachers’ ability to systematically study and improve their teaching.  相似文献   
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Researchers have advocated building a knowledge base for teacher education based on practitioner knowledge. In this article, the authors, two teacher educators, present knowledge gained from their systematic study of two lessons to help prospective teachers learn to study teaching. They offer a detailed look at the lessons' successes and shortcomings as well as potential revisions. They also reflect on their use of a model for systematically studying lessons, sharing details about their learning during this process. This article attempts to provide a visible, tangible product for other teacher educators interested in helping prospective teachers examine evidence of student learning.  相似文献   
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Law and Policy     
THE LAW OF PUBLIC COMMUNICATION by Kent Middleton and Bill Chamberlin (New York: Longman, 1988—$34.95)

SEVEN DIRTY WORDS AND SIX OTHER STORIES: CONTROLLING THE CONTENT OF PRINT AND BROADCAST by Matthew Spitzer (New Haven: Yale University Press, 1986—$15.00)

THE TELECOMMUNICATIONS DEREGULATION SOURCEBOOK edited by Stuart N. Brotman (Boston: Artech House, 1987—$60.00)

Besen, two Rand reports on intellectual property

GOVERNMENT INFORMATION: AN ENDANGERED RESOURCE OF THE ELECTRONIC AGE—THE FIRST ANNUAL STATE-OF-THE-ART INSTITUTE ( Special Libaries Assn, 1700 18th St NW, Washington, DC 20009—$21.75, paper)  相似文献   
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