论多元智能理论在定向运动训练中的应用

将多元智能理论应用于定向运动训练中,介绍多元智能理论的基本内涵、定向运动的概念和内涵,论述多元智能理论中的八种智能在定向运动中的分布,并从训练的实际出发,提出利用多元智能理论进行定向运动训练的具体训练方法,旨在为促进定向运动训练质量的提高及训练方法改革提供有益的参考与借鉴。     

MATLAB仿真在交流调压调速系统实验教学中的应用

在＂运动控制系统＂课程实验教学中,采用面向电气原理结构图的仿真方法,利用MATLAB环境中的SIMULINK仿真模块实现了晶闸管异步电动机交流调压调速系统的仿真建模及其分析.利用该模型对交流调压调速系统的性能进行了详细的仿真实验分析,得到和理论分析一致的结果.由于仿真模型是图形化的,具有直观可视性,用于实验教学中,学生易于理解系统的组成结构及其工作过程,有助于学生对交流调压调速系统的全面理解和学习.     

Activity and recovery cycles and skill involvements of successful and unsuccessful elite rugby league teams: A longitudinal analysis of evolutionary changes in National Rugby League match-play

We investigated changes in activity and recovery cycles and skill involvements: (1) during National Rugby league (NRL) match-play from 2004 to 2014 and (2) among successful and unsuccessful teams over the same period. Teams were divided into 4 tiers according to final ladder position: (A) 1st–4th, (B) 5th–8th, (C) 9th–12th and (D) 13th–16th. Total, mean and maximum ball-in-play time decreased, while recovery time increased from 2004 to 2014. Offensive and defensive skill involvements changed differentially over time with moderate to large reductions in the number of play-the-balls, offloads and missed tackles, and moderate to large increases in the number of passes, tackles made and ineffective tackles. The gap between Tier A and Tier D decreased for mean activity time and the proportion of short (<45 s) ball-in-play periods. Conversely, the gap between Tier A and Tier D increased for skill involvements, with Tier A completing more play-the-balls, and Tier D performing a greater number of offloads, and total, missed and ineffective tackles. Our results demonstrate the decreasing ball-in-play demands of NRL competition over 11 seasons. However, our data also highlight the narrowing gap in ball-in-play demands, and increasing gap in skill involvements between the top tier and bottom tier teams.     

Sodium bicarbonate ingestion increases glycolytic contribution and improves performance during simulated taekwondo combat

Purpose: To investigate the effect of sodium bicarbonate (NaHCO₃) on performance and estimated energy system contribution during simulated taekwondo combat. Methods: Nine taekwondo athletes completed two experimental sessions separated by at least 48?h. Athletes consumed 300?mg/kg body mass of NaHCO₃ or placebo (CaCO₃) 90?min before the combat simulation (three rounds of 2 min separated by 1 min passive recovery), in a double-blind, randomized, repeated-measures crossover design. All simulated combat was filmed to quantify the time spent fighting in each round. Lactate concentration [La^?] and rating of perceived exertion (RPE) were measured before and after each round, whereas heart rate (HR) and the estimated contribution of the oxidative (W_OXI), ATP (adenosine triphosphate)-phosphocreatine (PCr) (W_PCR), and glycolytic (W_{[ La^? ]}) systems were calculated during the combat simulation. Results: [La^?] increased significantly after NaHCO₃ ingestion, when compared with the placebo condition (+14%, P?=?0.04, d?=?3.70). NaHCO₃ ingestion resulted in greater estimated glycolytic energy contribution in the first round when compared with the placebo condition (+31%, P?=?0.01, d?=?3.48). Total attack time was significantly greater after NaHCO₃ when compared with placebo (+13%, P?=?0.05, d?=?1.15). W_OXI, W_PCR, VO₂, HR and RPE were not different between conditions (P?>?0.05). Conclusion: NaHCO₃ ingestion was able to increase the contribution of glycolytic metabolism and, therefore, improve performance during simulated taekwondo combat.     

液压摆式剪板机的运动仿真分析

液压摆式剪板机是锻压行业的重要设备,能否实现预期的剪切动作是保证精度的前提。以往常规的设计主要靠经验和类比同型机器,设计的反复性大,周期长,可靠性差。本文介绍了机床的基本结构和工作原理,详述了利用Pro/ENGINEER软件建立摆式剪板机模型以及进行复杂运动仿真的一些应用技巧和方法,为提高新产品研发效率提供了一种有效的途径。     

关于两道力学习题的质疑

通过质心运动定律和绕质心的转动定律得到刚体非定轴转动的动能定理,并对两道力学习题作了分析和讨论,     

关于“和平号”回归参数的计算

根据中国教育报 2 0 0 1年 4月 1日的文章《和平号空间站备忘录》提供的数据 ,计算“和平号”回归运行中的参数 ,主要有 :三次点火时和平号运行轨道上的速度 ;发动机工作时和平号的加速度及其消耗掉的燃料 ;和平号溅落地点的计算     

试论文化对动作技能学习的规约

运用逻辑分析法,寻找文化与动作技能之间的内在逻辑联系,发现并证明文化因素对动作技能学习的规约性。认为儿童身体的发育和动作技能的形成是在全面的文化生活过程中实现的,身体文化中的身体教育其直接目的就是身体的保健和积极促进身体的成长以及动作技能的形成,文化对动作技能的学习、改进和提高具有规约作用。     

我国女子铅球运动成绩增长规律的灰色模型及其预测

本文以灰色系统理论为基础,对我国女子铅球运动成绩增长规律进行了分析;并预测了90年代我国女子铅球运动水平的发展前景。     

“bdF类动作”起跳过程中不同手臂技术对“dF动作”效应的力学分析

运用力学理论阐述了人体空翻转体动作的一般原理,对目前自由式滑雪空中技巧项目的"bdF类动作"起跳过程中现有的两种手臂技术对"dF动作"的效应进行分析,提出理论上更为合理的一种新的"bdF类动作"起跳过程中的手臂技术,描述新技术的动作方法,论证新技术的生物力学合理性,对教练员、运动员提出尝试训练新技术的建议.