转体掷标枪与直接引枪投掷动作的技术比较

对近些年出现的转体投掷标枪技术和传统的直拉引枪技术进行比较 ,发现其重要的特点是转体中完成引枪 ,转体程度圈套 ,最后用力阶段躯干同时绕垂直轴和水平轴转动 ,最后用力距离加大。     

静力拉伸和动力拉伸对提高柔韧素质的研究综述

柔韧素质作为体能的要素之一,在运动训练中发挥着重要作用。柔韧素质训练方法有动力拉伸、静力拉伸以及PNF(本体感受法)三种训练方法。练习的形式则分为主动性拉伸和被动性拉伸。目前专门针对柔韧素质的训练中,练习者对各种练习的了解程度还不足;在对静力训练和动力训练练习效果的评价上,所做的研究还不够。     

南海西南部万安盆地新生代沉降分析及构造意义

南海盆地位处特提斯、环太平洋和古亚洲三大构造域交汇部,其西南部代表性万安盆地新生代地层发育齐全,但前人对其构造沉降及伸展机制研究比较薄弱,制约了人们对南海扩张和盆地演化的理解。基于构造格局和地层层序等区域地质资料,利用回剥法模拟万安盆地的构造演化史,并通过McKenzie纯剪切拉伸模型反复调整拉张因子拟合构造沉降史,得到万安盆地的伸展因子与伸展速度,最终通过岩石圈的热传导方程求取基底热流。研究结果表明：南海扩张、洋脊跳跃和西南次海盆扩张的共同作用控制万安盆地的沉降、伸展和热异常;万安盆地具有独特的时空演化特征,即沉降作用受断裂带左行和右行活动的影响,整体上具有V型转折特性,而伸展作用以“早东西、后南北”为主要特点;伸展和热异常均受构造活动的影响,呈现出以断裂带为异常轴、向两侧以不同的速率逐渐减弱的特征。     

"扑朔""迷离"求解

北朝民歌《木兰诗》"雄兔脚扑朔,雌兔眼迷离"中的"扑朔""迷离"作何解释,历来众说纷云莫衷一是。笔者认为,归纳起来,不外乎有两种说法。第一种:"扑朔",即"缩动"或"爬搔"之意,为兔走时足伸缩之貌;"迷离",即"朦胧",为眼色朦胧。第二种:"扑朔",形容雄兔脚上的毛蓬松的样子;"迷离",形容雌兔的眼睛被蓬松的毛遮蔽的样子。本文对这两种说法作了较具体深入的评析,并赞同第一种说法。     

光分插复用及实验系统的研究

利用本科生教学实验室的设备及条件开展毕业设计工作是实践教学改革中充分开发实验室功能的重要步骤。该文所涉及的实验内容是本科生毕业设计的主要工作，包括用熔融拉锥机拉制出1310nm及1550nm波长的波分复用器和制做基于上述2个波长的光分插复用器。在这一工作基础上，可开发出新的光纤通信实验项目和新的课程设计实践项目。     

Validity of the X-factor computation methods and relationship between the X-factor parameters and clubhead velocity in skilled golfers

The purpose of this study was to assess the validity of the X-factor computation methods and to examine whether direct relationships exist between the X-factor parameters and the clubhead velocity in a group of skilled male golfers (n = 18, handicap = ? 0.6 ± 2.1). Five driver trials were captured from each golfer using an optical motion capture system (250 Hz). Two plane-based methods (conventional vs. functional swing plane-based) and one Cardan rotation-based method (relative orientation) were used to compute select X-factor (end of pelvis rotation, top of backswing, ball impact (BI), and maximum), X-factor stretch (stretch and maximum stretch), and X-factor velocity (BI and maximum) parameters. The maximum clubhead velocity was extracted and normalized to golfer's body height to eliminate the effect of body size. A one-way repeated MANOVA revealed that the computation methods generated significantly different X-factor parameter values (p < 0.001). The conventional method provided substantially larger X-factor values than the other methods in the untwisting phase and the meaningfulness of select X-factor parameters generated by this method was deemed questionable. The correlation analysis revealed that the X-factor parameters were not directly related to the maximum clubhead velocity (both unnormalized and normalized).     

用环剥器对果树实施刻剥技术的调查与环剥器研究

用环剥器对果树进行刻剥．是新技术．通过调查发现，对果树用环剥器进行适时的刻剥，拉枝 多道环割，环剥 施肥等对果树成花效果，高产稳产能起到良好的作用．而设计出先进的环剥器，是实现这一新技术的关键．     

西方后现代主义思潮及其启示

后现代主义是在探究当代西方社会进程的新特征、新矛盾及其文化走向的过程中形成的,它的出现和蔓延有其学理上的根据。当代中国受到了西方后现代主义思潮的诸多影响,在对待后现代主义的态度上,即不能盲目追随,也不能简单否定,而应该正视我国的现实,大力批判和克服后现代主义的片面性、极端性和消极影响,并加以正确认识与引导,使其在中国文化语境中变形、消化和吸收。     

A review of models of vertical,leg, and knee stiffness in adults for running,jumping or hopping tasks

Abstract

The ‘stiffness’ concept originates from Hooke's law which states that the force required to deform an object is related to a spring constant and the distance that object is deformed. Research into stiffness in the human body is undergoing unprecedented popularity; possibly because stiffness has been associated with sporting performance and some lower limb injuries. However, some inconsistencies surrounding stiffness measurement exists bringing into question the integrity of some research related to stiffness. The aim of this study was to review literature which describes how vertical, leg and knee stiffness has been measured in adult populations while running, jumping or hopping. A search of the entire MEDLINE, PubMed and SPORTDiscus databases and an iterative reference check was performed. Sixty-seven articles were retrieved; 21 measured vertical stiffness, 51 measured leg stiffness, and 22 measured knee stiffness. Thus, some studies measured several ‘types’ of stiffness. Vertical stiffness was typically the quotient of ground reaction force and centre of mass displacement. For leg stiffness it was and change in leg length, and for the knee it was the quotient of knee joint moments and change in joint angle. Sample size issues and measurement techniques were identified as limitations to current research.     

兴趣导向性柔韧游戏对儿童青少年柔韧性素质的影响

目的:通过设计兴趣导向性柔韧游戏并对小学三年级学生进行运动干预,了解兴趣导向性柔韧游戏对儿童青少年柔韧素质干预的效果。方法:采用随机整群抽样方法,抽取上海市某区小学三年级两个班的学生为研究对象,分为兴趣导向性柔韧游戏实验班和对照班,受试者均为健康儿童且自愿参与本研究。设计兴趣导向性儿童柔韧游戏并对实验班学生进行为期九周、每周两次的运动干预,而对照班学生运动干预采用正常的静态或动态伸展练习。形态学测试指标有:身高、体重和体脂率,通过分别测试运动干预前后坐位体前屈、俯卧背伸及双手后勾等指标,比较实验班和对照班男女学生运动干预前后双手后勾、坐位体前屈及俯卧背伸等指标差异,了解兴趣导向性柔韧游戏对儿童青少年柔韧素质干预的效果。结果:①运动干预后实验班男女生坐位体前屈、俯卧背伸、双手后勾与运动干预前比较存在显著性差异(P<0.05)。②运动干预后实验班坐位体前屈、俯卧背伸、双手后勾与对照班也存在显著性差异(P<0.05)。结论:兴趣导向性柔韧游戏的运动干预可以有效发展儿童柔韧性素质。