对新规则下直拍进攻型打法发展趋势的研究

直拍进攻型打法曾经是我国乒坛的主流打法,由于缺乏创新,在近10多年一直不太景气.但是,直拍进攻型打法有其特定的优势,具有很强的抗争能力,只要创新技术、加强实力,就能登上世界乒坛的最高峰;诚然,它自身的确也存在着很多问题,加上11分赛制和无遮挡发球的实行,必定会给这种打法带来一些影响(正负双方面).因此,在新形势下对直拍进攻型打法进行进一步的深入剖析和探讨,成为我国乒坛亟待解决的课题.通过对世界优秀男子直拍进攻型打法选手的技战术进行统计与分析,并走访乒乓界权威人士和有关专家,对新规则带来的一些问题和该打法今后的发展趋势进行深入分析与探讨,为进一步提高我国直拍进攻型打法的技术水平提供科学理论和参考依据.     

广西自治区九运会举重比赛调研报告

研究结果表明 ,广西青少年举重运动正处于上升阶段。其表现背景是小级别优势项目仍在发挥作用 ,运动水平增长速度较快 ,运动员达到高水平的年龄和训练年限趋向提早 ,重点项目布局体系正在发挥效益功能。但试举成功率较低 ,杠铃后掉和挺不起是试举失败的主要因素。     

世界女排进攻战术简单化——排球技战术发展的一个过程

~~天津体育学院新增硕士点介绍     

谈钢琴演奏中的音乐想象力

在钢琴演奏中具有丰富的音乐想象力才能体验音乐作品的情感内涵，正确塑造艺术形象，使音乐充满活力。本文就钢琴作品演奏中，如何对作品进行分析理解、发挥音乐想象提出几点看法。     

A kinematic analysis of the spine during rugby scrummaging on natural and synthetic turfs

Artificial surfaces are now an established alternative to grass (natural) surfaces in rugby union. Little is known, however, about their potential to reduce injury. This study characterises the spinal kinematics of rugby union hookers during scrummaging on third-generation synthetic (3G) and natural pitches. The spine was sectioned into five segments, with inertial sensors providing three-dimensional kinematic data sampled at 40 Hz/sensor. Twenty-two adult, male community club and university-level hookers were recruited. An equal number were analysed whilst scrummaging on natural or synthetic turf. Players scrummaging on synthetic turf demonstrated less angular velocity in the lower thoracic spine for right and left lateral bending and right rotation. The general reduction in the range of motion and velocities, extrapolated over a prolonged playing career, may mean that the synthetic turf could result in fewer degenerative injuries. It should be noted, however, that this conclusion considers only the scrummaging scenario.     

Sprint and jump performances do not determine the promotion to professional elite soccer in Spain, 1994–2012

ABSTRACT

The aims of this study are (a) to describe the evolution of neuromuscular performance over an 18 year period within a Spanish elite reserve team; (b) to check if there were any relation between the playing position and sprint and jump performances and (c) to look into the alleged impact of this factor on the top playing level attained by the soccer players. We considered the physical tests (5 m and 15 m sprint times and countermovement jump (CMJ) height) made by 235 players enrolled in the reserve team of the Club from 1994 to 2012 and the highest competitive-level they achieved: Spanish first (n = 39) and second divisions (n = 36) and semi-professional (n = 160). Furthermore, the players were classified according to their playing positions. The main findings were a very-likely/most-likely lower neuromuscular performance (ES = 0.48–0.68, small to moderate) in the last six-season term (2006–2012) than in the first term (1994–2000); possibly/very-likely lower performances in sprinting and CMJ (ES = 0.22–0.55, small) by central defenders (CDs) and midfielders than by other playing positions; very-likely better performances in sprinting and jumping by first and second divisions central defenders than by semi-professional central defenders (ES = 0.90–1.02, moderate). Sprint and jump performances are not a relevant physical parameter to promote to the top level of soccer in Spain except for one in six of the playing positions: CDs.     

初学翻译者首先应解决的两个"关键"

针对初学者翻译的特点，通过较多的理论及实例指导实践性很强的跨文化交际活动——翻译，说明了翻译初期应该首先解决的两个关键性问题——一为初学翻译症即翻译腔；二为模糊症即未能了解立体交叉式的英汉对应关系，以便使初学翻译者提高翻译质量，深入顺利地继续今后的翻译工作。     

钢琴教学中的读谱方法

读谱是对音乐作品的感性认识,也是对作曲家创作意图的直接感受。在钢琴读谱的过程,建立视、听、唱、弹等各项感官协调的联系,完成各种动作形成弹奏的定势,进行科学的读谱训练,钢琴的弹奏才能显得优美完整。     

"空竹"锻炼对老年人抗衰老能力的影响

对参加空竹运动前、后的60名某单位退休职工老年人4项指标超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(selenium dependent glutathione peroxidase,GSH-PX)、过氧化氢酶(CAT)、丙二醛(MDA)进行测定调查分析.结果显示,运动后SOD、GSH-PX、CAT活性高于运动前(P＜0.05、P＜0.01),MDA含量低于运动前(P＜0.05).表明,空竹运动能够提高中老年人抗氧化能力,减少自由基对机体的损伤,起到了延缓衰老的作用.     

乒乓球运动对跟骨骨密度的影响

目的：探讨乒乓球运动对跟骨骨密度的影响。方法：采用CM-100超声波骨密度测定仪进行跟骨部超声波传导速度（SOS）的测定,同时测定血睾酮浓度。结果：乒乓球运动员的跟骨骨密度与普通大学生有显著性差异,两组骨密度都与血睾酮呈正相关。结论：乒乓球运动对跟骨骨密度有促进作用,血睾酮与骨密度有一定的相关性。