中外男子撑竿跳高的技术比较及提高途径

运用数理统计的方法,对国内外12名优秀男子运动员的有关技术参数进行统计处理,比较研究我国与外国运动员的技术水平的主要差距和提高我国撑竿跳高水平的途径。     

陇东皮影的传承与发展

皮影艺术历史悠久,民间关于其起源说法不一,据考证皮影在宋代就已经非常完善和盛行了。陇东皮影属秦晋影戏,是中国皮影的重要一支。清代中叶,陕西东路皮影传入陇东,经几百年的发展和几代人的改革和创新,陇东皮影的发展融入了当地的文化与观念,形成了具有独特艺术性的民间艺术。     

Force–velocity characteristics of upper limb extension during maximal wheelchair sprinting performed by healthy able-bodied females

The aim of this study was to determine the relationship between force and velocity parameters during a specific multi-articular upper limb movement – namely, hand rim propulsion on a wheelchair ergometer. Seventeen healthy able-bodied females performed nine maximal sprints of 8?s duration with friction torques varying from 0 to 4?N?·?m. The wheelchair ergometer system allows measurement of forces exerted on the wheels and linear velocity of the wheel at 100 Hz. These data were averaged for the duration of each arm cycle. Peak force and the corresponding maximal velocity were determined during three consecutive arm cycles for each sprint condition. Individual force–velocity relationships were established for peak force and velocity using data for the nine sprints. In line with the results of previous studies on leg cycling or arm cranking, the force–velocity relationship was linear in all participants (r?=??0.798 to ?0.983, P?<0.01). The maximal power output (mean 1.28?W?·?kg^?1) and the corresponding optimal velocity (1.49?m?·?s^?1) and optimal force (52.3?N) calculated from the individual force–velocity regression were comparable with values reported in the literature during 20 or 30?s wheelchair sprints, but lower than those obtained during maximal arm cranking. A positive linear relationship (r?=?0.678, P?<0.01) was found between maximal power and optimal velocity. Our findings suggest that although absolute values of force, velocity and power depend on the type of movement, the force–velocity relationship obtained in multi-articular limb action is similar to that obtained in wheelchair locomotion, cycling and arm cranking.     

“影子教育”之全球扩张：教育公平、质量、发展中的利弊谈

"影子教育"这一术语已被广泛用于描述利用校外时间对学校科目进行的私人补充教育。在世界上的一些地区,"影子教育"已作为一种显著的教育现象历经了几十年,而在另一些地区,则是在近几年才变得突出。"影子教育"在全球逐渐扩张,中国也不例外。它给政策制定者、教师、家庭和学生带来了一系列挑战。"影子教育"在有些方面是有益的,但在有些方面却带来了问题。     

科技期刊中外文字母"i"、"e"正斜体使用正误辨析

科技期刊中比较常用的外字母“i”、“e”正斜体使用方面误排的情况比较普遍．笔在学习GB3100～3102-93以及翻阅相关献的基础上，对“i”、“e”正斜体使用方面进行了详细的归纳，并对可能出现的错误进行了剖析．在实际的编辑工作中，我们要分析“i”、“e”在行中所表示的含义，才能对它们做出正确判断并加以规范，以提高刊物的编排质量．     

对Lagrange乘数法的两点浅析

讨论了Lagrange函数的性质及乘数的经济意义     

写作思维中的“模块”现象

写作思维中存在着“仿模块”、“仿模块”与影子、“反模块”现象。“仿模”有两类：原创性的和模拟性的。“仿模”若形成影子,就成了虚幻无价值的东西。“反模块”具有极强的创新思维品质。写作是思维的创造性艺术,思维是写作的关键,创造性是思维的灵魂。     

环县道情皮影戏中的打击乐

环县道情皮影戏流行于甘肃环县及周边地区,具有浓郁的地方色彩,其打击乐形式独特、内容丰富,是不可或缺的重要组成部分。本文重点将环县道情皮影戏中的打击乐分类,并逐一介绍其特点和作用。     

关于带B的子带eBe的讨论

主要讨论了带B的子带eBe与带的各矩形带的相交情况和各矩形带的划分。     

教师素质研究范式及其发展趋势

有关教师素质的研究从最初比较笼统的理论论述逐渐细化到教师知识、观念、能力、行为和人格特质等不同层面的实验研究,研究范式从“专家—新手范式”发展到“过程—成果范式”,近来又呈现出从单一模型向综合模型发展的趋势。