高翻及窄拉类练习对挺举提铃能力的训练作用分析

研究目的:了解举重训练中常用的高翻及窄拉类练习对挺举提铃的训练作用。研究方法:运用影像测量结合动力学测量,对高翻、窄速拉、窄硬拉等练习动作进行量化分析,重点研究了"人/杠"重心的运动轨迹和速度曲线,在对数据进行统计学处理的基础上,通过典型实例进行数据特征进行分析和讨论。结果与结论:发现这3种练习动作对于挺举提铃训练具有不同的作用特征,而且受完成动作质量的影响。训练中应将这些特征与训练目标相结合有针对性的进行安排,并且要有练习要求,才能较好的达到训练目的。     

Why students leave engineering and built environment programmes when they are academically eligible to continue

The retention of students to graduation is a concern for most higher education institutions. This article seeks to understand why engineering and built environment students fail to continue their degree programmes despite being academically eligible to do so. The sample comprised 275 students registered between 2006 and 2011 in a faculty of engineering and the built environment, who were academically eligible to continue, but failed to register for their studies the following academic year. The sociological notions of structure and agency were used to make sense of the data. The findings suggest that some students had control over their decision to leave and some students’ decisions were dominated by various structural factors. The outcome of the study is helpful in terms of suggesting what actions can be taken in order reduce the number of students leaving in good academic standing.     

女子举重运动员抓挺举大强度训练的调查与分析

采用现场观察、问卷调查与数理统计相结合的方法,对我国高水平女子举重运动员抓挺举大强度训练的效应进行分析。结果表明,不同级别的女子举重运动员,其大强度训练的内容、负荷量与训练效应密切相关。     

我国男子排球强攻扣球技术存在的问题及其训练

通过调查访问和统计分析，阐述了男子排球训练和比赛中强攻扣球的重要性，分析了我国男子排球在强攻扣球技术上的差距和问题，并对提高我国男子排球的强攻技巧和技术训练提出了若干建议性意见，为新组建的国家男排训练的比赛提供参考。     

对波洛克行动绘画的解读

把画布钉在地板上或墙上,舍弃画笔、铲、刀等绘画工具,把颜料随意泼洒在画布上,并在画布周围加入动作。颜料在画布上流淌、交错,创造出纵横交错的抽象线条效果,这种绘画方式后来被称为行动绘画,这种特殊的作画方式也是自立体主义以来最重要的革命性创举。     

高考生源持续下降背景下招生工作的策略——以内蒙古自治区高职院校为例

针对内蒙古自治区高考生源下降对高职院校招生工作造成一定冲击的现实,分析高考生源下降的原因及对高职院校发展所带来的危害,提出要积极制定自治区高职院校招生工作的策略,确保高职院校能够健康稳定的发展。     

Identifying and Addressing Student Difficulties with the Millikan Oil Drop Experiment

The Millikan oil drop experiment has been characterized as one of the ‘most beautiful’ physics experiments of all time and, certainly, as one of the most frustrating of all the exercises in the undergraduate physics laboratory. A literature review reveals that work done on addressing student difficulties in performing the oil drop experiment has, to date, not achieved a significant measure of success. The historical background of the oil drop experiment is well established in the literature from the perspective of historians of science, but not so from the perspective of teachers and students of science. A summary of historical details surrounding the original experiment suitable for use in revising the instructional approach is presented. Both Millikan and his graduate student, Fletcher, are featured with the view to emphasizing details that humanize the protagonists and that are likely to raise student interest. The issue of the necessary reliance on presuppositions in doing speculative research is raised, both from the historical account and from the insights of university physics students who heard the historical account and performed the experiment. Difficulties current students have in performing the experiment are discussed from the perspective of Hodson (Stud Sci Educ 22:85–142, 1993) framework and the students’ own observations. Last, further historical materials are outlined that may be used to encourage student insight into the fundamental nature of electricity. It is proposed that these aspects are essential as a basis for identifying and addressing student difficulties with the Millikan oil drop experiment.

关于氧化还原滴定教学的探讨

本文讨论了氧化还原滴定教学中学生易感到困惑的一些问题,并提出了相关的处理方法.     

555压控振荡器振荡周期计算公式的修正

由555时基电路组成的压控振荡器,经实验得出的ux-T曲线中有一个极小值,这和理论计算值有较大差异。分析了产生这种现象的原因是控制信号ux较小时,受放电管V的饱和压降uces影响所致,并对理论计算公式进行了修正。     

河北省小康农村地区初中学生辍学现象社会原因探析--河北省小康农村地区初中学生辍学现象研究之一

在小康农村地区,存在着产生初中生辍学现象的特殊社会原因,它在一定程度上造成了教师工作的消极、家长培养的消极和学生学习的消极情绪。这种教育外的社会原因与教育内的原因结合起来,导致了大量学生的辍学：