提高助跑的准确性

我们的跳远和三级跳远运动员年年都提高了运动成绩,从而走在世界优秀运动员的最前列.但是,他们迄今仍然存在着助跑准确性差这一缺点.捷尔——奥尔涅祥和戈利稚夫在去年的比赛季节中,脚踏板过线的错误占全部跳跃的30-50%.费多谢耶夫和加列也尔也常犯踏板过线或过早起跳的错误.利稚霍夫斯基当助跑不准确时,就会降低成绩20——30厘米.在最优秀运动员当中,助跑较准确的一些的,只有沙波鲁谱娅和波达连柯两人.至于其余的许多运动员的助跑也往往缺乏稳定的准确性.对不准确的助跑进行分析的结果表明,在训练实践中,我们没有采用有效的方法,来帮助运动员把动     

游泳推进力的流体力学分析(续)

这部分的研究目标是对游泳选手划水的各种熟练技能在三度空间里进行分析。所要进行的力量计算,关键在于他们的划臂动作。我们利用手的运动座标给我们表示出手的速率的大小,后掠角度和倾斜角度。函数方程式1和2: L=1/2pV~2C_CS D=1/2pV~2C_DS是可以成立的。这样,力量的计算便是可能的。 方法 分析影片步骤:运用二轴性的技巧获得电影资料。以俯视面和侧视面作为主要的观察平面。通过     

北京的绿色宣言

Beijing Organizing Committee of the 2008 Olympic Games (BOCOG) released a draft of the Ecological Environment Protection Plan on September 6.The Ecological Environment Protection Plan, a part of the "Beijing Olympic Action Plan", will serve as the guideline for the city's environmental development in the next six years.The draft plan, which is composed of six parts, is subject to public opinions In the following month, said BOCOG. BOCOG will revise the draft in accordance with the public opinionsand then work out the final edition.     

知识服务:在新职业中的文件信息管理工作

一、知识服务作为一种新的职业正在兴起信息管理领域正在兴起一种新职业——知识服务,我们把该职业定位成一种把知识管理、信息管理和战略(以业绩为中心)学习与培训联系到一起的职业。对组织来说,知识服务为企业领域提供了一种保证组织活动成功的管理方法。     

Predation may not be the major cause for hare-lynx cycles

The classic hare-lynx cycle has been cited as a prime example of how interactions between predators and preys might lead to regular population variation.However, a recent study by CAS zoologists shows that it might not be the case. Their work published in the July issue of the Germany-based Climate Research.     

夜登西奈山追赶摩西

在星夜打着手电筒重踏摩西走过的路,想象当年垂老的他怎样克服艰险登上西奈山,在熊熊烈火中谛听上帝的诫命,接受上帝与以色列人的约定——这种经历,对基督徒和非基督徒都一样终身难忘。西奈山壮丽的日出,更让登临极顶的旅人遐想无限……     

Research gains insight into the guidance mechanism of neuronal migration

Neuronal migration, a process in which neurons travel a large distance from the areas where they are born to different parts of the brain where they will settle in their final positions,plays a critical role in early brain development.     

A state-of-the-art photoemission spectroscopy

Photoelectric effect refers to a phenomenon that electrons are ejected when a material is irradiated by light. Photoemission spectroscopy is widely used as an experimental method to directly measure the electronic structure of materials. Based on this technique, cutting-edge research is conducted on various issues in such fields as semiconductors,superconductors, magnetic materials.     

战风——东南亚和欧美的模式差异

绝大多数的电子竞技体育目前均是对抗性质的,Dota亦如此。在比赛中获胜这唯一目标下,取胜的手段亦层出不穷。首先便是臭名昭著的养人。Dota里,特别是在5系列中,一个法师往往仅需要一双鞋 5个无用护符便可以发挥巨大的威力。如果选择一个后期英雄加四个法师的阵容搭配,且4个法师全力支撑后期英雄的装备,那么比赛最终的结果只有一个:无聊。每每都是一样的步骤,每