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4×100m接力跑传、接棒最佳位置的确定与起动标志线(让距)的计算 被引量:3
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作者 季国胜 黄津 《当代体育科技》 2015年第28期67-71,共5页
笔者通过分析4×100 m接力跑"传接棒全过程"(从传棒队员跑至起动标志线<接棒队员起动>到传、接棒队员完成传、接棒动作止)传、接棒队员两者速度和相互间距离的变化规律,对比传棒队员最后30 m和接棒队员起动30 m速... 笔者通过分析4×100 m接力跑"传接棒全过程"(从传棒队员跑至起动标志线<接棒队员起动>到传、接棒队员完成传、接棒动作止)传、接棒队员两者速度和相互间距离的变化规律,对比传棒队员最后30 m和接棒队员起动30 m速度曲线。发现:"传、接棒的最佳位置(地点)应在接力区后10 m之内"、"最理想的交接棒过程应在接力区的最后一段"等看法并不适用所有水平的接力运动队,尤其是对于基层一般水平队员。通过进一步研究,根据上述两者速度曲线,运用本文所介绍的"图表比例测算法"可以确定传、接棒的最佳位置;在确定最佳位置(如:传棒队员传棒的最佳位置距预跑线的具体距离数)的前提下,详细说明了通过传、接棒队员已有的分段(10 m)计时数据或实测"传接棒全过程"各自跑距耗时来测算相关变量,从而最终计算出接棒队员起动标志线(让距)的方法及注意事项。 展开更多
关键词 4×100 m力跑 传、接棒 最佳位置 时机 起动标志线 计算
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Temperature in High Temperature SHPB Experiments
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作者 邓志方 谢若泽 +2 位作者 颜怡霞 李思忠 黄西成 《Transactions of Tianjin University》 EI CAS 2008年第B10期536-539,共4页
As an experimental technique, it’s desired that the temperature in specimen is uniform in high temperature split Hopkinson pressure bar (SHPB) experiments. However, the temperature in specimen decreases and the tempe... As an experimental technique, it’s desired that the temperature in specimen is uniform in high temperature split Hopkinson pressure bar (SHPB) experiments. However, the temperature in specimen decreases and the temperature of bars increases when specimen starts to contact with bars, which induces the nonuniform temperature distribution in specimen, and may result in inac-curacy of experimental results. In this paper, the temperature distributions of specimen and bars in high temperature SHPB experiments were investigated while the specimen was heated alone. Firstly, the temperature history of specimen was measured at different initial temperatures by ex-periments, then simulation was carried out. Simulation results were consistent with experimental results by adjusting the thermal contact coefficient between specimen and bars. By this way, the thermal contact coefficient and simulation results were validated, and the proper cold contact times of specimen and bars in high temperature SHPB experiments were discussed. Finally, the results were compared with those in references. 展开更多
关键词 high temperature SHPB experiment heat transfer thermal contact coefficient cold contact time
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