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1.
浅析世界冠军张津京比赛心理稳定性的形成 总被引：1，自引：0，他引：1
运动员在体操比赛中的心理稳定对技术发挥起着决定性的作用。本文介绍了白远韶教练关于世界冠军张津京比赛心理稳定性形成的切身体会，其所用的方法手段值得借鉴。 相似文献
2.
Israeli junior high‐school science teachers usually have a background in biology, and their knowledge of physics is limited. We show that by improving teachers' qualitative understanding it is possible to increase their confidence and willingness to teach physics. We conducted three‐day workshops for teachers (n = 92), which were followed by ongoing activities and support. The teacher workshops were based on a new qualitative approach that we developed for studying mechanics, which has been shown to be effective with students. A study of teachers who had not participated in the workshop shows that they had the same conceptual difficulties as their students. A comparison of pre‐ and post‐workshop questionnaires indicates that the participating teachers gained self‐confidence in their ability to explain everyday phenomena, changed their views about the relevance and interest of physics to the students and were willing to implement the method in their classes. 相似文献
3.
Internet entrepreneurship: Social capital, human capital, and performance of Internet ventures in China 总被引：3，自引：0，他引：3
Bat Batjargal 《Research Policy》2007,36(5):605-618
This article examines the interaction effects of social capital and human capital (experience) of entrepreneurs on the performance of Internet ventures. The empirical data are composed of the longitudinal surveys of 94 Internet ventures in Beijing, China. The study found that the interaction of social capital and Western experience of entrepreneurs has a positive effect on the survival likelihood of Internet firms whereas the interaction of social capital and startup experience of entrepreneurs has a negative effect on firm performance. 相似文献
4.
Systems thinking is regarded as a high‐order thinking skill required in scientific, technological, and everyday domains. However, little is known about systems thinking in the context of science education. In the current research, students' understanding of the rock cycle system after a learning program was characterized, and the effect of a concluding knowledge integration activity on their systems thinking was studied. Answers to an open‐ended test were interpreted using a systems thinking continuum, ranging from a completely static view of the system to an understanding of the system's cyclic nature. A meaningful improvement in students' views of the rock cycle toward the higher side of the systems thinking continuum was found after the knowledge integration activity. Students became more aware of the dynamic and cyclic nature of the rock cycle, and their ability to construct sequences of processes representing material transformation in relatively large chunks significantly improved. Success of the knowledge integration activity stresses the importance of postknowledge acquisition activities, which engage students in a dual process of differentiation of their knowledge and reintegration in a systems context. We suggest including such activities in curricula involving systems‐based contents, particularly in earth science, in which systems thinking can bring about environmental literacy. © 2003 Wiley Periodicals, Inc. J Res Sci Teach 40: 545–565, 2003 相似文献
5.
This longitudinal study investigated the progression in junior high school (JHS) students' conceptions of the structure of matter while studying a new instructional approach dealing with “Materials.” In particular, we studied the progression of students' learning along two dimensions: (a) the conceptual model; and (b) the context of application. Students were asked to draw the structure of several materials and to write their explanations about the structure of these materials in questionnaires administered five times during a 3‐year period. Results indicate students' progression in their microscopic conceptualization of materials. Toward the end of the instruction about 85% of the students used a microscopic model in their representations, and 36% were able to give a molecular model. About 83% of the students retained a microscopic model. Different profiles of JHS students' progression in the conception of the structure of matter were identified. The study suggests that a long‐term development of the particulate model requires: (a) constructing a solid foundation of knowledge about microscopic structure of materials; and (b) a spiral instruction. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 45: 132–152, 2008 相似文献
6.
白静江 《商丘师范学院学报》1997,(Z3)
导出了普遍形式的哈密顿函数守恒原理，并由此进一步导出了普遍形式的机械能守恒定律，最后指出分析力学中的机械能守恒条件与牛顿力学中的机械能守恒条件的等效性． 相似文献
7.
Students at the junior high school (JHS) level often cannot use their knowledge of physics for explaining and predicting phenomena. We claim that this difficulty stems from the fact that explanations are multi‐step reasoning tasks, and students often lack the qualitative problem‐solving strategies needed to guide them. This article describes a new instructional approach for teaching mechanics at the JHS level that explicitly teaches such a strategy. The strategy involves easy to use visual representations and leads from characterizing the system in terms of interactions to the design of free‐body force diagrams. These diagrams are used for explaining and predicting phenomena based on Newton's laws. The findings show that 9th grade students who studied by the approach advanced significantly from pretests to post‐tests on items of the Force Concept Inventory—FCI and on other items examining specific basic and complex understanding performances. These items focused on the major learning goals of the program. In the post‐tests the JHS students performed on the FCI items better than advanced high‐school and college students. In addition, interviews conducted before, during, and after instruction indicated that the students had an improved ability to explain and predict phenomena using physics ideas and that they showed retention after 6 months. © 2010 Wiley Periodicals, Inc. J Res Sci Teach 47: 1094–1115, 2010 相似文献
8.
Bat‐Sheva Eylon Ruth Ben‐Zvi Judith Silberstein 《International Journal of Science Education》2013,35(2):187-196
Pupils’ conceptual difficulties in scientific problem‐solving are examined on the basis of their performance on complex tasks and on the simple tasks of which the complex tasks are composed. A theoretical analysis reveals that identical errors on a complex task are not necessarily due to the same errors on the associated component tasks. This is illustrated by reference to actual research findings. The educational implications of this finding are discussed. 相似文献
9.
Zahava Scherz Liora Bialer Bat‐Sheva Eylon 《Research in Science & Technological Education》2013,31(1):49-69
This study was carried out in the framework of continuous professional development (CPD) programmes following a CPD model aimed at promoting ‘accomplished practice’ involving: pedagogical knowledge, content knowledge, pedagogical content knowledge and scholarship of teaching. Teachers were asked to bring evidence about their practice. The context was related to the ‘Learning Skills for Science’ (LSS) programme, which advocates the explicit incorporation of high‐order learning skills into science school curricula. The main goal of the study was to test the evidence‐based LSS CPD model by investigating the impact of its related CPD programmes on participating teachers. The impact relates to teachers’ perceptions about teaching learning skills, teachers’ LSS practice, and their professional influence in the educational system. As part of the evaluation method, we developed a criterion‐based diagnostic tool and a visual representation, designed to assess a teacher’s professional profile and progression according to dimensions of ‘accomplished practice’. The diagnostic tool can be adjusted and tailored to different CPD domains. Results indicated that requiring teachers to bring evidence from practice and students’ learning enabled us to follow teachers’ progress and succeeded to improve their performances towards accomplished LSS practice. The results exemplify a synergy between CPD designed activities and the ongoing evaluation of its impact. 相似文献
10.
中文体育类核心期刊研制方法探究 总被引：1，自引：0，他引：1
核心期刊常用测定方法有：引文法、索引法、文摘法、载文法、累计百分比法和综合测定法。不同的测定方法侧重点不同，各有特点。根据１９９５年度中文体育类核心期刊的测定结果，全面地分析、比较了上述各种测定方法的客观性、合理性及局限性，并提出了针对性的改进意见和建议。 相似文献