共查询到20条相似文献,搜索用时 15 毫秒
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初永和 《辽宁师范大学学报(自然科学版)》2013,(3):437-442
三人制篮球起始于美国的街头篮球活动,现已风靡世界且有成为奥运会正式比赛项目的趋势.中国仅2012年参加三对三篮球赛的队伍就高达5万多支,运动员约18万人,其中青少年学生是绝对的生力军.基于一是由于篮球运动影响深远、价值重大而深受高校大学生的喜爱,二是由于高校篮球和三人制篮球有许多相像、相近或相似之处,三是由于三人制篮球比赛简捷易行、规则的随意性、趣味性强、商业化程度高,认为三人制篮球在中国高校有无限的发展空间和广阔的发展前景,分析中国高校开展三人制篮球在提高体育教学中学生的练习密度、促进阳光体育活动广泛开展、丰富校园体育文化等方面的价值与功能. 相似文献
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乔占俊 《华北科技学院学报》2004,1(3):73-74
对架空线路单端和双侧均与有限容量电源系统相连接,因电容效应等因素产生的准稳态过电压进行了计算分析,其结果可用于对系统过电压保护及绝缘水平的确定。 相似文献
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The rise of granular computing 总被引:3,自引:0,他引:3
YAO Yi yu 《重庆邮电大学学报(自然科学版)》2008,20(3):299-308
This paper has two purposes. One is to present a critical examination of the rise of granular computing and the other is to suggest a triarchic theory of granular computing. By examining the reasons, justifications, and motivations for the rise of granular computing, we may be able to fully appreciate its scope, goal and potential values. The results enable us to formulate a triarchic theory in the light of research results from many disciplines. The three components of the theory are labeled as the philosophy, the methodology, and the computation. The integration of the three offers a unified view of granular computing as a way of structured thinking, a method of structured problem solving, and a paradigm of structured information processing, focusing on hierarchical granular structures. The triarchic theory is an important effort in synthesizing the various theories and models of granular computing. 相似文献
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The delayed rise of present-day mammals 总被引:1,自引:0,他引:1
Bininda-Emonds OR Cardillo M Jones KE MacPhee RD Beck RM Grenyer R Price SA Vos RA Gittleman JL Purvis A 《Nature》2007,446(7135):507-512
Did the end-Cretaceous mass extinction event, by eliminating non-avian dinosaurs and most of the existing fauna, trigger the evolutionary radiation of present-day mammals? Here we construct, date and analyse a species-level phylogeny of nearly all extant Mammalia to bring a new perspective to this question. Our analyses of how extant lineages accumulated through time show that net per-lineage diversification rates barely changed across the Cretaceous/Tertiary boundary. Instead, these rates spiked significantly with the origins of the currently recognized placental superorders and orders approximately 93 million years ago, before falling and remaining low until accelerating again throughout the Eocene and Oligocene epochs. Our results show that the phylogenetic 'fuses' leading to the explosion of extant placental orders are not only very much longer than suspected previously, but also challenge the hypothesis that the end-Cretaceous mass extinction event had a major, direct influence on the diversification of today's mammals. 相似文献
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在探讨电子政务的建设与发展的过程中,首先分析了电子政务中数据的特点,概述了电子政务中数据采集与提取的过程和方法,阐明了电子政务信息系统与GIS信息系统的效能和内在关系,最后展望了电子政务信息系统在实际当中的应用. 相似文献
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西方历史哲学的兴起与早期发展经历三个阶段:人之外的思辨的历史哲学,现实的人的发展的历史哲学、无视或漠视普通人的作用的思辨的历史哲学。回顾这一历程有助于当前重新认识唯物史观的科学价值和捍卫历史学的科学地位。 相似文献
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严俊 《青海师范大学学报(自然科学版)》2008,(3):23-25
针对铁道牵引变压器在各种负荷条件下的温升情况,进行了深入的仿真计算研究,揭示了影响牵引变压器温升的因素,并对如何充分利用牵引变压器容量提出了建议. 相似文献
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叶丽梅 《杭州师范学院学报(自然科学版)》2004,3(3):201-202
2000年美国经济结束了长达10年的持续增长,2001年3月美国经济进入衰退,对美国经济走势的评估和预测成为全球关注的热点。这些预测对于认清美国经济发展的轨迹,具有一定的积极意义。美国未来经济走势仍然充满较大的变数。 相似文献