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...     

学好英文需要意识到的五点

我第一次来中国是读高三的第一个学期．之前没有学过汉语。来之前的那年暑假我就买了一套中文磁带．放在车上,开车的时候就听。我以为那样做效果就会很好,以为到了中国就能很快学会讲中文。     

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。     

An undergraduate course to bridge the gap between textbooks and scientific research

This article reports on a one-semester Advanced Cell Biology course that endeavors to bridge the gap between gaining basic textbook knowledge about cell biology and learning to think and work as a researcher. The key elements of this course are 1) learning to work with primary articles in order to get acquainted with the field of choice, to learn scientific reasoning, and to identify gaps in our current knowledge that represent opportunities for further research; 2) formulating a research project with fellow students; 3) gaining thorough knowledge of relevant methodology and technologies used within the field of cell biology; 4) developing cooperation and leadership skills; and 5) presenting and defending research projects before a jury of experts. The course activities were student centered and focused on designing a genuine research program. Our 5-yr experience with this course demonstrates that 1) undergraduate students are capable of delivering high-quality research designs that meet professional standards, and 2) the authenticity of the learning environment in this course strongly engages students to become self-directed and critical thinkers. We hope to provide colleagues with an example of a course that encourages and stimulates students to develop essential research thinking skills.     

A study assessing the potential of negative effects in interdisciplinary math-biology instruction

There is increasing enthusiasm for teaching approaches that combine mathematics and biology. The call for integrating more quantitative work in biology education has led to new teaching tools that improve quantitative skills. Little is known, however, about whether increasing interdisciplinary work can lead to adverse effects, such as the development of broader but shallower skills or the possibility that math anxiety causes some students to disengage in the classroom, or, paradoxically, to focus so much on the mathematics that they lose sight of its application for the biological concepts in the center of the unit at hand. We have developed and assessed an integrative learning module and found disciplinary learning gains to be equally strong in first-year students who actively engaged in embedded quantitative calculations as in those students who were merely presented with quantitative data in the context of interpreting biological and biostatistical results. When presented to advanced biology students, our quantitative learning tool increased test performance significantly. We conclude from our study that the addition of mathematical calculations to the first year and advanced biology curricula did not hinder overall student learning, and may increase disciplinary learning and data interpretation skills in advanced students.     

Harnessing technology to improve formative assessment of student conceptions in STEM: forging a national network

Concept inventories, consisting of multiple-choice questions designed around common student misconceptions, are designed to reveal student thinking. However, students often have complex, heterogeneous ideas about scientific concepts. Constructed-response assessments, in which students must create their own answer, may better reveal students' thinking, but are time- and resource-intensive to evaluate. This report describes the initial meeting of a National Science Foundation-funded cross-institutional collaboration of interdisciplinary science, technology, engineering, and mathematics (STEM) education researchers interested in exploring the use of automated text analysis to evaluate constructed-response assessments. Participants at the meeting shared existing work on lexical analysis and concept inventories, participated in technology demonstrations and workshops, and discussed research goals. We are seeking interested collaborators to join our research community.     

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。