浅谈校园英语角的建立、维护与发展     

张建玲 《中国科技信息》2007,1(23):296-297

本文从学生的听说能力亟待提高谈起,认为校园英语角作为学生课堂之外提高听说能力的一种重要途径,我们要重视它的建立,更要重视它的维护,积极寻找一切有效途径使之得到不断的发展与完善。  相似文献   

第15、16届世界杯赛角球进攻战术比较研究   总被引：1，自引：0，他引：1  

毛卫国  张文普  史海现  柳天杨 《洛阳师范学院学报》2003,22(2):67-69

本文采用临场观察统计法和对比法 ,对第 1 5、1 6届世界杯赛决赛阶段比赛角球进攻情况作了比较研究 ,初步揭示了角球进攻战术发展变化的一般特点 ,研究表明 :两届世界杯赛角球进攻数量相当而质量上则存在较大的差异 ;长传配合角球相对短传配合角球在进攻水平上有了明显提高 ;角球进攻战术将在未来足球进攻中发挥更为重要的作用  相似文献   

画法几何原理在金属加工工艺方面的应用     

魏增菊 《平原大学学报》2001,18(2):47-48

零件上的斜孔在进行金属加工时，在工艺方面有一工艺转角的问题，应用画法几何的投影原理和方法，采用投影变换的方法，用图解法来求出其工艺转角的实际大小，以便定位加工，解决了零件结构上的斜孔加工问题。  相似文献   

元杂剧中“墙”意象探微——以《西厢记》、《墙头马上》为例     

刘安庆 《绵阳师范学院学报》2013,(9):51-54

"墙"作为一个意象出现在中国古典戏剧中,它的涵义已超过纯粹意义上的地理空间的内蕴,而是作为阻隔与约束的象征包含深厚的文化意蕴,成为青年男女追求自由爱情的一道障碍,对他们的自我个性及命运产生了很大影响。逾墙相从,翻墙私奔成为打破封建礼教,追求健全人格,实现个性解放的起点。  相似文献   

Early Soviet Visual Antireligious Propaganda: The Display of Print Images in the Past,Present and Digital Future     

Kevin M. Kain 《Slavic & East European Information Resources》2013,14(3-4):216-241

ABSTRACT

This study examines information about the display of early Soviet visual anti-religious propaganda in the past in order to conceptualize its re-presentation in the digital future. Based on recent research conducted in the Hoover Institution Library and Archive and other American and Russian collections, it considers printed visual images of the 1920s–1930s, including posters. It also investigates the theory and practices that guided their display detailed in the specialized literature and disseminated in the anti-religious periodicals Bezbozhnik and Bezbozhnik u stanka. These materials make it possible to recover the structures and contents of historic propaganda displays and to replicate and re-exhibit them virtually with digital technologies.  相似文献   

基于多视角分析的跆拳道横踢技术研究     

王鸣骏 《体育科技》2013,(6):50-52

通过对跆拳道运动发展的现状具体分析,从这种运动的动作特性出发,从生物力学、安全性、运动学等角度对横踢技术进行深入研究,对揭示其内在规律,探究适合国人的跆拳道运动方针政策,具有重要的意义;在跆拳道教学实践当中,为跆拳道横踢技术的训练方式、教学指导方法的确定,提供相应的理论依据.  相似文献   

Three-dimensional kinematics and ground reaction forces during the instep and outstep soccer kicks in pubertal players     

Athanasios Katis  Eleftherios Kellis 《Journal of sports sciences》2013,31(11):1233-1241

Abstract

The purpose of the present study was to compare the three-dimensional kinematics of the lower extremities and ground reaction forces between the instep kick and the kick with the outside area of the foot (outstep kick) in pubertal soccer players. Ten pubertal soccer players performed consecutive kicking trials in random order after a two-step angled approach with the instep and the outstep portion of the foot. Three-dimensional data and ground reaction forces were measured during kicking. Paired t-tests indicated significantly higher (P < 0.05) ball speeds and ball/foot speed ratios for the instep kick compared with the outstep kick. Non-significant differences in angular and linear sagittal plane kinematic parameters, temporal characteristics, and ground reaction forces between the instep and outstep soccer kicks were observed (P > 0.05). In contrast, analysis of variance indicated that the outstep kick displayed higher hip internal rotation and abduction, knee internal rotation, and ankle inversion than the instep kick (P < 0.05). Our results suggest that the instep kick is more powerful than the outstep kick and that different types of kick require different types of skill training.  相似文献   

第29届北京奥运会男子足球比赛中角球进攻战术研究     

李春君 《深圳信息职业技术学院学报》2009,7(1):93-96

本文通过对参加2008年北京奥运会男子足球比球赛决赛阶段的32场比赛的角球进攻战术运用情况的观察与统计分析,研究了北京奥运会男子足球比赛中角球进攻战术的一些特征,可为我国足球运动队训练与比赛提供理论参考依据。  相似文献   

A systematic review of propulsion from the flutter kick – What can we learn from the dolphin kick?     

Jordan T. Andersen  Ross H. Sanders 《Journal of sports sciences》2018,36(18):2068-2075

Propulsion, one of the most important factors in front crawl swimming performance, is generated from both the upper and lower limbs, yet little is known about the mechanisms of propulsion from the alternating movements of the lower limbs in the flutter kick (FK). The purpose of this systematic review was to review the literature relating to the mechanisms of propulsion from FK in front crawl. There was limited information about the mechanisms of propulsion in FK. Since movements of the lower limbs are similar between FK and the dolphin kick (DK), mechanisms of propulsion from DK were reviewed to better understand propulsion from FK. Recent evidence suggests that propulsion in DK is generated in conjunction with formation and shedding of vortices. Similar vortex structures have been observed in FK. Visualisation and simulation techniques, such as particle image velocimetry (PIV) and computational fluid dynamics (CFD), are non-invasive tools that can effectively model water flow without impacting swimming technique. These technologies allow researchers to estimate the acceleration of water and, consequently, the propulsive reaction forces acting on the swimmer. Future research should use these technologies to investigate propulsion from FK.  相似文献   

Changes in organisation of instep kicking as a function of wearing compression and textured materials     

Hosni Hasan  Keith Davids  Jia Yi Chow  Graham Kerr 《European Journal of Sport Science》2017,17(3):294-302

This study investigated effects of wearing compression garments and textured insoles on modes of movement organisation emerging during performance of lower limb interceptive actions in association football. Participants were six skilled (age?=?15.67?±?0.74 years) and six less-skilled (age?=?15.17?±?1.1 years) football players. All participants performed 20 instep kicks with maximum velocity in four randomly organised insoles and socks conditions, (a) Smooth Socks with Smooth Insoles (SSSI); (b) Smooth Socks with Textured Insoles (SSTI); (c) Compression Socks with Smooth Insoles (CSSI); and (d), Compression Socks with Textured Insoles (CSTI). Results showed that, when wearing textured and compression materials (CSSI condition), less-skilled participants displayed significantly greater hip extension and flexion towards the ball contact phase, indicating larger ranges of motion in the kicking limb than in other conditions. Less-skilled participants also demonstrated greater variability in knee–ankle intralimb (angle–angle plots) coordination modes in the CSTI condition. Findings suggested that use of textured and compression materials increased attunement to somatosensory information from lower limb movement, to regulate performance of dynamic interceptive actions like kicking, especially in less-skilled individuals.  相似文献