排序方式： 共有4条查询结果，搜索用时 0 毫秒
1
1.
2.
本文运用文献资料法、录像观察法和数理统计法等对东京奥运会竞技体操双杠动作编排及决赛成绩进行研究分析,旨在探索双杠夺冠特点及未来的发展趋势。研究结果表明：(1)优秀运动员动作编排多以高难度价值挂臂类动作开始提升起评分,后面则以难度价值为D组和E组的悬垂和希里类动作过渡,在下法上均选用前团2周转体180下。(2)双杠项目四个动作组别发展存在非均衡性,Ⅰ组和Ⅲ组动作为多数运动员的选择,难度价值更高的Ⅱ组动作使用较少,难度价值为F组的前团2周转体180下成为下法主流动作。(3)运动员成套动作结构以D组、E组为主,并向F组、G组方向发展,发展难度永远是运动员不变的追求。(4)成套动作难度是获胜的基础,高完成质量是关键,只有实现“双高”才是取胜的保证,二者缺一不可。 相似文献
3.
随着师资培训工作的深入开展，许多教师要求观摩“名师佳课!’的愿望越来越强烈。他们除了收看中国教育电视台播出的一些全国各地有代表性的“名师佳课”外，更希望能观摩到当地一些学科带头人、骨干教师的授课。但是，传统的公开课只能使一部分教师观摩到授课的实况，而且由于条件的限制，效果也不理想。 相似文献
4.
A numerical investigation was performed on the reduction of the fluid forces acting on the square cylinder in the laminar flow regime with a perforated plate. The effects of geometric parameters such as the distance between the square cylinder and the perforated plate on the wake of the square cylinder were discussed. Furthermore, the flow characteristics such as the drag coefficient, lift coefficient, Strouhal number and flow pattern were obtained. It can be concluded that the drag force of the square cylinder reduces to some extent due to the addition of the perforated plate. The flow structure varies when the perforated plate is located behind the square cylinder. Moreover, the recirculation zone augments with the increase of L/D, and the vortex trace on the upper and lower surface of the square cylinder moves gradually backwards until a stable recirculation zone formed between the square cylinder and the perforated plate. 相似文献
1