A method of providing accurate velocity feedback of performance on an instrumented kayak ergometer

On a kayak ergometer, an accurate simulation of the athlete-paddle-kayak system kinematics is essential for analysing the relationship between technique and performance. The purpose of this study was to establish a strong relationship between performances on flatwater and performances on an ergometer by means of propulsive force measurement and drag models. Two trials were performed by 12 kayakers in which they were first timed over 250 m of flatwater kayaking (the reference test) and were then asked to perform a trial of the same duration on the ergometer with the same perceived physical exertion. Three techniques for measuring propulsive force and three drag models generated nine combinations, which were all evaluated for their ability to estimate kayak velocity. For each combination, the distance covered by the athlete on the ergometer was simulated. A kayakers’ ergometer ranking was based on the average velocity in the ergometer trial. Both distance and ranking were compared to the on-water results. The simulation with the best combination of force measurement and drag model gave an accurate estimate of distance (253 ± 10.5 vs. 250 m) and ranking compared to the reference test.     

探索竞技体育后备人才培养与“体教结合”的发展思路

概括总结竞技体育后备人才培养与＂体教结合＂优势及其制约因素.提出＂体教结合＂的研究与发展动态和＂体教结合＂竞技体育后备人才培养的必由之路,以及对业余训练＂体教结合＂的思考,把＂体教结合＂作为体育后备人才培养的一种培养模式.     

中学课余体育训练存在的问题及对策

培养体育后备人才，是关系当代体育发展的重要研究课题，中学是培养我国体育后备人才的重要基地，主要通过课余训练来进行，当前学校课余训练中普遍存在重比赛名次，追求升学率，轻培养输送，训练制度不健全，缺乏科学性和系统性等问题，为此，特提出一套解决的对策。     

六省(市)竞技体育重点项目后备人才发展现状研究

查阅文献资料,通过数理统计与逻辑分析认为,六省(市)竞技体育重点项目人才培养各有特色:广东人才总数量较多;一类重点项目中,山东有6个项目人数最多;三大球中,足球广东省人数较多,篮球辽宁省人数较多,排球山东省人数较多。第5届城运会与第9届全运会奖牌数相比江苏增长最快。     

负重振动练习与超等长练习对篮球运动员下肢力量影响的对比实验研究

利用K islter测力台,运用对比实验的方法,将一种新的负重振动力量训练法与超等长跳深练习法进行实验研究,发现两种方法对影响篮球运动员下肢力量有着不同的特点,并运用运动生理和生物力学知识进行了相应的分析和判断。     

广西游泳后备人才基本情况的调查与分析

采用文献资料、专家访谈、问卷调查及数理统计等方法,对广西省15个竞技游泳后备人才培养基地的人才培养情况进行调查分析.结果显示:广西各地的县级游泳训练的人数比以前少了许多,这一现象对整个广西游泳训练及人才培养体系的建设来说是一种损失.希望通过此次调查,对广西竞技游泳事业的进一步发展提供帮助.     

论人与自然和谐发展

人与自然和谐发展是当今世界一个值得研究的题目。要使人与自然和谐发展，不仅要重视人的作用，也必须重视自然的作用；不仅要征服改造自然，也必须保护自然，提高人们对保护自然的认识；还要正确认识和处理人与自然的关系。     

Relationships between highly skilled golfers’ clubhead velocity and force producing capabilities during vertical jumps and an isometric mid-thigh pull

Whilst previous research has highlighted significant relationships between golfers’ clubhead velocity (CHV) and their vertical jump height and maximum strength, these field-based protocols were unable to measure the actual vertical ground reaction force (vGRF) variables that may correlate to performance. The aim of this study was to investigate relationships between isometric mid-thigh pull (IMTP), countermovement jump (CMJ), squat jump (SJ) and drop jump (DJ) vGRF variables and CHV in highly skilled golfers. Twenty-seven male category 1 golfers performed IMTP, CMJ, SJ and DJ on a dual force platform. The vertical jumps were used to measure positive impulse during different stretch-shortening cycle velocities, with the IMTP assessing peak force (PF) and rate of force development (RFD). Clubhead velocity was measured using a TrackMan launch monitor at a golf driving range. Pearsons correlation coefficient analyses revealed significant relationships between peak CHV and CMJ positive impulse (r = 0.788, p < 0.001), SJ positive impulse (r = 0.692; p < 0.001), DJ positive impulse (r = 0.561, p < 0.01), PF (r = 0.482, p < 0.01), RFD from 0–150 ms (r = 0.343, p < 0.05) and RFD from 0–200 ms (r = 0.398, p < 0.05). The findings from this investigation indicate strong relationships between vertical ground reaction force variables and clubhead velocity.     

论带电体的力密度问题

本文阐明公式的物理意义，并说明总场在计算带电体力密度时所起的作用，同时讨论了带电面上的场强．     

高黎贡山百花岭地区鞘翅目主要昆虫种群动态

于2006~2012年每年7月份在高黎贡山自然保护区百花岭地区对鞘翅目昆虫进行采集,通过鉴定,共发现22个科,64个种,其中,主要优势种群5个,分别为库光胫锹甲、双滴斑菁、橡胶木犀金龟、茶色金龟子和木棉天牛。并对优势种群动态进行了研究与分析,提出了相应防控建议。