我国女子垒球运动员击球节奏分析

本文主要对垒球击球动作节奏进行研究,探寻垒球击球的节奏特点,并探索促进和提高运动员击球节奏的训练方法、手段,为建立和培养运动员良好的击球节奏提供实际训练中的帮助。希望本研究对于提高我国垒球的击球技术水平,解决我国垒球存在的实际问题能有所帮助。     

影响我国垒球运动员体能状况的因素分析及对策研究

通过文献资料分析并结合当前我国垒球运动员体能水平状况以及现代垒球运动的项目特征,剖析了影响我国垒球运动员的体能特征的各因素,并在此基础上提出相关的解决方法和措施,以期为我国垒球运动员体能水平的提高提供有益的建议。     

好球手看到的球大

在击出了一记精彩的本垒打后,一位著名的垒球运动员得意洋洋地说:“在我的眼中,垒球跟西瓜一样大。”这句话也许夸张了一点,不过却有它的科学道理,同样一个比赛用球,在好球手眼中,确实要感觉大一些。在一次垒球比赛结束后,研究者让47个垒球运动员从8个不同尺寸的圆圈中挑出他们觉得与垒球的尺寸最接近的一个。研究者发现,垒球手的击打命中率和他们感知的球的大小有关系。那些击打命中率较高的球手挑选了比真实垒球尺寸大的圆圈,而击打命中率低的球手选择的圆圈尺寸等于甚至小于真实垒球的尺寸。研究者又找到了美国扔飞盘比赛冠军队的成员做…     

影响棒球运动员比赛中击球技术发挥的心理因素

在比赛中击球员击球过程中,影响击球员击球效果的因素很多,但其中最为重要的,就是心理因素了。当击球员进入击球区等待击球的时候,是否拥有良好的心理素质和扎实的基本功成为其击球效果好坏的最重要因素,有许多技术水平高的运动员往往发挥不如技术水平低的运动员,这就是心理因素制约击球员技术水平发挥的表现。     

羽毛球运动损伤现状调查 ——以武汉市高校为例

随着我国羽毛球专业水平的提高,国内的业余羽毛球运动也开展得如火如荼,武汉市业余羽毛球运动也蓬勃开展,尤其武汉市几所高校近些年招收的高水平运动员,更是带动了武汉市高校羽毛球整体水平的提高.而羽毛球运动中出现的伤病严重影响了高校羽毛球运动员的训练持续性和成长的节奏,甚至牵连了整个运动生涯.因此了解武汉市高校羽毛球运动员的伤...     

花剑比赛中比分变化对比赛结果的影响

随着击剑项目发展至今,花剑选手临场比赛技术的不断成熟,比赛节奏也逐渐加快,同时运动员临场的心理压力也会增加,比赛胜负的偶然性开始增多。这就给运动员具备掌控比赛节奏的能力提出了更高的要求。比分之间存在的微妙变化,与最终结果之间存在着不可忽略的关系,研究比分与结果之间存在的关系,能够更好地帮助花剑选手在比赛中调整比赛节奏,改变技战术打法,并最终获取比赛胜利。     

羽毛球步法速度问题分析及训练方法

在羽毛球运动中,运动员场上步法的移动速度会直接影响击球的质量。探讨如何提高步法速度,对提高羽毛球运动技术水平有着十分重要的意义。     

浅析节奏练习在排球教学中的运用

文章通过对节奏及节奏练习的诠释及在排球运动中的特点,来阐述两者之间的关系,并结合排球运动在教学中分析归纳,来掌握节奏。节奏练习在排球教学中的运用上,采用语言,调动运动员的思维和音乐伴奏等辅助练习,加强节奏的训练,从而使运动员从掌握节奏感中学习基本技术战术,提高成绩,取得事半功倍的效果。     

对高水平跳高运动员助跑弧线和助跑节奏的分析

跳高运动的助跑弧线和助跑节奏是跳高技术的开始部分,对最后的起跳过杆起到重要的作用。运用文献资料法对高水平跳高运动员的助跑弧线和节奏研究得出：优秀的跳高运动员助跑弧线和助跑节奏稳定,有鲜明个人的特点,总是为最后的起跳创造有利的条件。     

我国竞技体育运动员文化教育的现状及对策研究

运动员文化教育是体育事业可持续发展的一个极其重要的环节,通过文化教育可以有效提高运动员的综合素质,有助于教练员的科学训练和运动员竞技能力的提高.从我国运动员文化教育的现状和存在的问题出发,运用文献资料法、访谈法和逻辑分析法,通过探讨我国运动员文化教育的现状和存在的问题,并通过一定的分析研究,旨在探索提高我国运动员文化教育工作的有效对策和途径,从而为更好地促进我国体育事业持续、健康发展服务,也为今后运动队进行文化教育提供理论和实践依据.     

提高太极柔力球反手位接抛球技术的探索与研究

太极柔力球反手抛接球技术在比赛中的应用频率较高,提高太极柔力球反手抛接球技术对比赛的胜利尤为重要。在高校的体育教学中,学生在太极柔力球反手位接抛球应用上还存在很多不足。本文对如何提高太极柔力球的反手位接抛球技术进行了探索与研究。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence     

Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels

<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese