我国跳远运动员助跑速度与腾起速度的优势与不足

通过对中外优秀跳远运动员助跑速度和起跳相关运动学参数的比较，发现我国优秀跳远运动员的助跑速度利用率明显高于世界优秀跳远运动员，其助跑速度接近世界优秀运动员的水平.我国跳远运动员的高助跑速度利用率增加了起跳难度，使其起跳获得的垂直速度和腾起角度明显低于世界优秀运动员，由此导致其成绩低于世界优秀运动员。     

优秀跳远运动员助跑速度特性分析

对优秀跳远运动员助跑速度若干特性,运用文献资料收集整理和综合分析方法,以现代跳远专项速度训练的特点为出发点,探讨优秀跳远运动员助跑速度的主要元素,从而提高跳远助跑速度训练的实效性,为跳远助跑速度训练实践提供依据.     

中外优秀男子跳远运动员速度特征比较分析

助跑是跳远技术的基础,助跑速度是决定跳远成绩的主要因素,而速度利用率则是素质水平和技术水平以及能力的体现。通过文献收集国内外部分优秀男子跳远运动员的跳远运动学参数和速度特征。针对跳远运动中,绝对速度与跳远成绩的关系,以及助跑速度、起跳速度、速度利用率等因素对跳远成绩的影响进行比较。结果表明,尽快提高跳远运动员短跑水平和绝对速度,在此基础上保持适宜的速度利用率增大腾起角度,使水平速度和垂直速度的配比更为合理,是提高我国优秀跳远运动员成绩的有效途径。     

男子跳远运动员垂直速度变化对成绩影响探讨

运用文献资料法对国内外优秀跳远运动员起跳瞬间诸因素的对比分析,提出了起跳时垂直速度的变化是影响跳远运动成绩的又一重要因素,通过对跳远起跳垂直速度理论机制的研究,揭示了我国男子运动员在垂直速度和腾起角两个方面与国外优秀运动员的差异,并提出合理建议.     

中外男子跳远运动员助跑与起跳技术的特征比较分析

本文以优秀男子跳远运动员为研究对象,对跳远中的助跑与起跳技术特征进行了对比研究．通过对中外优秀男子跳远运动员关键技术参数的运动学比较和分析,发现我国男子跳远运动员的绝对速度较慢,起跳能力较差,腾起角相对较小,是造成我国男子跳远成绩偏低的重要因素．我国运动员在今后的跳远训练中,应在保持较高速度利用率的基础上,合理增大腾起角,提高绝对速度,完善起跳技术．     

中外优秀男子跳远运动员起跳技术运动学分析

通过对中外优秀男子跳远运动员起跳技术运动学分析，认为发展运动员短跑速度能力，提高起跳水平速度，起跳垂直速度和腾起角度，是当今优秀男子跳远运动员起跳技术的显著特征，也是影响跳远成绩的重要运动学指标。只有各项技术实现最佳组合和匹配，才能取得好成绩。     

影响跳远成绩的主要因素分析

采用文献资料法、数理统计法和对比分析等研究方法,对国内外男子优秀跳远运动员的助跑速度、水平速度及垂直速度和腾起角度等参数的对比分析与研究,探讨跳远各影响因素之间的关系,并对我国跳远运动如何提高跳远成绩提出建议。     

论如何提升跳远助跑过程中的速度利用率

跳远助跑的快慢较大程度取决于速度利用率的大小,从跳远助跑的技术,快速起跑、助跑的能力及助跑节奏稳定性等方面,结合实际经验及有关资料分析,阐述如何提升速度利用率的重要性,得出我国优秀跳远运动员与世界优秀运动员所存在的差异,以促进跳远训练水平的提高。     

中外优秀跳远运动员的摆动腿技术对比分析

全文主要分析了我国优秀跳远运动员的起跳阶段摆动腿的摆动技术,并与国外优秀跳远运动员的摆动技术进行对比分析。通过他们对速度利用率、踏板速度、腾起初速度、起跳角等技术参数的对比,从中找出差异。     

跳远成绩与相关速度参数回归分析

对国内外优秀男子跳远运动员跳远成绩与速度参数进行回归分析,结果表明：助跑最后两步速度、腾起垂直分速度是影响跳远成绩最主要的两个速度参数。建立跳远成绩与相关速度参数回归方程模型,能够预测跳远成绩,指导训练过程的开展。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…