道次、场地条件和运动水平对速度滑冰女子1000m速度节奏的影响研究     

李芙蓉  陈月亮  吴新炎 《哈尔滨体育学院学报》2013,(4):16-22

为了探索道次、场地条件和运动水平对速度滑冰女子1000m速度节奏的影响。采用文献资料、访谈和数理统计等研究方法,分析了2012—2013赛季哈尔滨站速度滑冰世界杯和关国速度滑冰世界锦标赛女子1000m前后两次比赛均参加的运动员分段数据,结果认为：（1）速度滑冰女子1000m道次不同造成运动员速度节奏的明显差异,外道速度波动比内道更大;（2）速度滑冰女子l000m场地条件不同,速度节奏存在显著性差异,条件越差的比赛场地,其启动阶段加速节奏越快,600—1000m分段速度节奏越慢;（3）速度滑冰女子1000m高、低水平运动员百分速度节奏存在显著性差异,低水平运动员0—200m启动阶段相对加速节奏更快,600—1000m分段高水平运动员百分速度节奏更快。  相似文献   

优秀男子速滑运动员500m全程速度量化特征研究     

崔性赫  陈月亮  黄达武 《哈尔滨体育学院学报》2013,(6):28-33,39

为探讨优秀速滑运动员500m全程速度节奏问题,以个案研究法对2008年荷兰短距离世锦赛我国两名优秀男子运动员比赛数据进行了量化分析,结果表明：（1）于凤桐滑跑内道时速度节奏控制较为合理,第一弯道和第二弯道滑跑充分利用弯道提供的有利条件实现了加速,但滑跑外道时在两个弯道表现较差。安伟江外道滑跑除第三直道降速较为明显外,其它段落滑跑较为合理,但内道滑跑时第一弯道未能实现应有加速,影响了整个全程的速度节奏分配;（2）最大速度能力、速度耐力和两次滑跑的稳定性对获取优异运动成绩起决定性作用,从本次比赛两次滑跑来看两名运动员稳定性较差;（3）弯道是节奏控制的关键区域,运动员应适当控制入弯道和出弯道速度节奏,充分利用弯道的力学优势合理加速。当速度节奏控制符合场地力学原理时运动成绩一般表现较好,反之较差。  相似文献   

Dot-to-dot practice enhances Children's handwriting: The advantage of a multi-session training protocol     

《Learning and Instruction》2023

Handwriting instruction commonly involves the practice of non-linguistic writing-like patterns. Here, we compare the transfer to Arabic sentence-writing of different practice scheduling of the Invented Letter Task (ILT), a simple dot-to-dot connecting task, aiming to decide best-practice scheduling. Ninety-seven 7- to 8-year-old public-school Arab Israeli second-graders were assigned randomly, within-class, to five study groups: three single-session practice groups (different amounts, with 60/180/360 repetitions), a 360-repetition multi-session practice group (distributed across four days), and an untrained control group. Handwriting was assessed at pre-training, 24-h, and 4–5 weeks post-training. The findings revealed that by 4–5 weeks post-training all the practice groups wrote more fluently or accurately than the control group. The multi-session practice group's handwriting performance was advantageous to that of the other groups, being more fluent than the other groups and more legible than the control group. The findings suggest that practicing simple grapho-motor tasks may enhance handwriting abilities.  相似文献   

板鞋竞速进入高校体育课堂的可行性研究     

李兴华 《钦州学院学报》2012,27(3):85-88

通过对板鞋竞速项目的起源、发展、运动特点及价值功能等方面进行研究,对在普通高校大学生中开展板鞋竞速民族传统体育的教学进行可行性研究和必要性分析,继而对民族传统体育项目进入高校大学生体育课堂教学,提供参考和建议。  相似文献   

直流调速系统模糊控制器设计     

李岩  王燕锋  詹宏惟 《辽宁科技学院学报》2012,14(2):14-16

传统的转速-电流双闭环直流调速系统结构简单、设计较为方便,在工业中得到了广泛的应用。然而由于PI控制算法的局限性,使得传统直流调速系统鲁棒性较差,不能满足高精度动态性能应用场合的控制要求。本文采用Fuzzy(模糊)—PID复合控制方式,把转速的偏差的大小的绝对值和偏差变化率的绝对值作为模糊控制器的输入,用来调整转速环节PID控制器、、三个参数,实现控制器参数的在线自调整功能。仿真说明了所用方法的有效性。  相似文献   

中外优秀男子跳远运动员速度特征比较分析     

林坚  卢利莉 《贺州学院学报》2013,(2):134-137

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。  相似文献   

On Your Mark,Get Set … Talk! The First-Ever NASIG Speed Rounds     

Yvette Diven 《期刊图书馆员》2013,64(1-2):71-77

This article examines the purpose, structure, and short-term outcomes of a new Strategy Session format introduced at the NASIG Twenty-Second Annual Conference. Borrowing from the trend in modern matchmaking known as speed dates, this interactive Strategy Session employed a moderated round robin format that brought publishers and librarians together to discuss serials topics of common interest. Limited by the clock, participants had the opportunity to ask questions and share thoughts from their perspectives as serials producers and serials consumers. Though of limited duration, discussions could touch on any topic related to the creation, use, and impact of serials in the participants' respective areas of work and interest. The Strategy Session was offered in two time slots on the first day of the conference.  相似文献   

普通高校400m运动员速度、速度耐力训练负荷控制研究     

史伟 《山西师大体育学院学报》2008,23(Z1)

通过对广州体育学院田径队短跑运动员速度、速度耐力及负荷控制等训练要素的实施,总结出短跑训练的指导思想和基本思路,为短跑训练的科学化、系统化提供实践指导。  相似文献   

A security-embedded infrastructure for Tele-Traffic Speed Control     

Mohammed A. Khasawneh  Mohammad I. Malkawi  Sa’ed M. Hayajneh  Hadeel Y. Qasaimeh 《Journal of The Franklin Institute》2009,346(5):431-448

In this paper we introduce a novel approach, relying on intelligent engineering, whereby the maximum speed limit at which vehicles on the road can cruise is controlled from some central or distributed facility. The system, as designed, leverages the use of the ubiquitous cellular infrastructure to cut down the costs involved that would otherwise accrue as a result of the need to build a dedicated traffic control system.In the new system maximum speed limits are transmitted from a Central Control Facility (CCF) to all stretches of roads and highways dispersed across urban areas in a highly dynamic manner. The system uses information arriving via a dynamic feedback system on prevailing weather conditions, road conditions, and bulk of traffic, amongst others, before it would broadcast maximum speed limit information to various destinations. When deployed in its final release, this will be done using a highly automated system with little human intervention.The work presented in this paper elaborates the TTC Network Design and RSU Network Distribution for the Tele-Traffic Speed Control System, to remotely manage, enforce, and control the maximum speed limit allowed on road stretches in rural and urban areas for different vehicle categories.The new system has been deployed successfully in a laboratory controlled environment on three vehicle categories; one category representing passenger vehicles, another buses and commuter transport, while the third representing trucks and freight traffic. It is expected that when the system is fully deployed on the wireless infrastructure, speed-related traffic accidents will witness a drop by more than 65-70% according to known accident statistics.  相似文献   

提高应用程序执行速度的几种方法     

程玉荣  杨泽刚  周建平  刘向君 《人天科学研究》2009,(11)

应用程序执行的速度越快越好。讨论了几种提高应用程序运行速度的方法和技术。通过编写实际应用程序,证明这些方法和技术非常适合应用在短时间内(如在帧周期里)处理并显示大量的像素点的应用程序中。  相似文献