给被雪压的果树解除重负

下大雪了, 怎么办？ 是用一杆难以耍动的矛 刺穿跳舞的,飘落的 大雪花,     

最危险的污染：核污梁的世界简史

【编者按】日本3．11大地震引发的福岛核电站核辐射灾难,已成地球人再度反思核“安全”的焦点,但很遗憾如果像往常那样,只局促于技术层面去反思,从长远看,毫无疑问,是无济于事的。让人类身陷囹圄的何啻技术,难道出路仍然是创造更好的技术？人类想改变一切,却往往不肯改变自己,自作孽却不自知。核灾难的历史本身,就用毁灭性的事实反复...     

我国“择校”现象的教育社会学阐释

义务教育阶段的择校问题不仅是社会各界反映强烈的热点问题,而且是影响义务教育公平性和均衡性的难点问题。教育社会学关注教育获得与社会分层的关系,运用教育选择功能理论、阶层优势与社会选择理论、教育成层理论对择校问题进行分析,可以使人们明确其产生的深层原因。要规范择校行为,使其成为促进义务教育公平、推动教育均衡发展的有力举措,政府必须加大实施义务教育均衡化的力度,改革现行择校制度,同时要大力发展多种类型的中学教育,为人的成才提供多种渠道。     

Team-based learning in anatomy: an efficient, effective, and economical strategy

Team-based learning (TBL) strategy is being adopted in medical education to implement interactive small group learning. We have modified classical TBL to fit our curricular needs and approach. Anatomy lectures were replaced with TBL that required preparation of assigned content specific discussion topics (in the text referred as "discussion topics"), an individual self-assessment quiz (IRAT), analysis of the discussion topics, and then the team retaking the same quiz (GRAT) for discussion and deeper learning. Embryology and clinical correlations were given as lectures. Unit examinations consisted of graded IRAT and GRAT. The National Board of Medical Examiners (NBME) Subject Examination was the comprehensive final examination. To evaluate the effect of TBL on student performance we compared the departmental and NBME subject examination scores between the traditional and TBL curricula. We collected five years of data on student performance in TBL-based anatomy and lecture-based preclinical courses. Our results show that departmental and NBME subject examination scores for TBL-based anatomy were higher than those for lecture-based anatomy. We subsequently compared average NBME scores for anatomy with those in other preclinical courses that were lecture-based. Average NBME anatomy scores were significantly higher than those for all the lecture-based preclinical courses. Since the introduction of TBL in anatomy, student performance has progressively improved in the NBME subject examination. Students perceived TBL as a motivator to be a responsible team member and to contribute to collective learning by the team. Further, it reinforced self-directed learning and fostered an appreciation for peer respect. Interestingly, these perceptions were uniform irrespective of student course performance.     

教育数据挖掘工具综述

数据挖掘拥有悠久的历史,它可以追溯到探索性数据分析(Tukey, 1977),且目前已经形成了有效的、可推广的方法.本文将讨论教育数据挖掘研究与实践中逐渐兴起的一些工具,以及在更广泛的层面上数据挖掘和数据科学研究者所使用的相关工具,近40种教育领域数据挖掘与分析的常用工具,包括数据处理与特征工程工具、算法分析工具、可视化效果工具,以及EDM和LA的特殊应用,如贝叶斯知识跟踪工具、文本挖掘、社会网络分析、过程与序列挖掘、PSLC服务站等.本文将为初次接触这一领域的研究者提供有用的信息,以帮助他们找到有用的工具.     

新疆普通高校体育教学现状调查

采用问卷调查法等对新疆普通高校体育教学模式、教学大纲、课程设置、教师队伍、教材使用、体质健康标准的实施现状等进行调查。调查显示,教师专业结构不合理,教学与科研不能协调发展,体育教师的待遇与工作负荷不成正比。具有地方特色、民族特色、学校特色的体育教改新思路在新疆普通高校逐渐兴起。建议:加强对体育教师的专业培训;在教学中注重培养学生终身体育观念,培养学生积极健身意识;要充分体现民族体育和现代体育的有机结合,开展具有少数民族体育特色的教学活动。     

专家邮箱

鱼跃救球靠谱吗?看到职业选手飞身鱼跃救球的动作太帅了,我也想学学,但是找不到这方面的教程,同时也有些担心,怕动作不对把自己给摔坏了,或者把球拍摔坏了也不好。请问如何鱼跃救球,或者直接告诉我,菜鸟用鱼跃救球靠谱吗?     

澳网的启示

2011年的澳网依旧没有迎来一位新的大满贯冠军,但这并不意味着网球的世界没有因它而改变。弥漫在墨尔本公园两周的硝烟已经散去,澳网带给我们的启示却依旧在延续。     

胡安·马丁·德尔·波特罗双手反拍赏析

1无论是采用关闭式站位还是开放式站位打双手反拍,就像德尔·波特罗在这里所展示的这样,你必须要做两件事情：分开和准备。在你的身体和双手间留出适当的空间,并不需要什么特殊的距离,只要确保你处于舒服和放松的状态就行——紧张的肌肉会制造出僵硬的击球。准备,指的是在球拍和步法上的简单的调整。