田径专项运动员运动损伤的危险因素研究     

李祖仁  严明  陈明腾 《福建体育科技》2021,(2):33-36,44

目的:分析田径运动员发生运动损伤的风险因素.方法:通过对136名男性田径运动员进行身体测试及运动损伤情况调查,测试内容包括:身高、体重、体成分、关节柔韧性、关节稳定性,在此基础上分析田径运动中发生运动损伤的危险因素.结果:胭绳肌拉伤的主要危险因素是年龄因素(OR值=1.31)和陈旧性损伤(OR值=9.81);而腹股沟部...  相似文献   

超高含水原油混合流动及初始沉积特性     

邢晓凯  吕朝旭  刘珈铨 《中国科学院大学学报》2020,37(2):228-233

使用自行设计的实验装置,对超高含水原油的流动特性和初始沉积过程进行探究。系统研究实验温度、混合流速和体积含水率对超高含水原油初始沉积过程的影响,分析不同温度下原油的运动形态和初始沉积方式。初始沉积过程可分为蔓延沉积过程和粘连沉积过程,根据沉积特点和压降曲线的变化趋势将初始沉积过程分为3个阶段：沉积诱导期、快速沉积期和沉积动态平衡期。通过对沉积物碳数分布的分析,得知超高含水原油初始沉积过程中,同时存在剪切剥离作用、胶凝作用和分子扩散作用。实验温度和体积含水率主要通过改变胶凝作用和分子扩散来影响初始沉积过程,混合流速通过改变剪切剥离强度来影响初始沉积过程。  相似文献   

An exploration of young professional football players’ perceptions of the talent development process in England     

《Sport Management Review》2020,23(3):536-547

The identification and development of players in English professional football has become an increasingly significant topic of debate given the historical perceived underperformance of the English national team at international tournaments. To enhance understanding of the challenges and barriers experienced by English youth footballers, the authors explore the developmental experiences of English professional football players from different levels of the English football pyramid. Professional players (N = 11) from football clubs in the top four professional divisions in England took part in individual semi-structured interviews, which were analysed inductively using thematic analysis. The data revealed three interrelated themes that were perceived to mediate player identification and development pathways at professional clubs. Pathways for young players to progress and experience first-team competitive football differed when the level of the league that the players operated within was considered, with significant issues also raised relating to the suitability of the under 21 league structure, the importance attached to the educational welfare of young players, and variations in the identification of player attributes. This study sheds new light on the priorities and processes of talent development and education provision in English football.  相似文献   

分子印迹技术及其在环境领域的应用   总被引：6，自引：0，他引：6  

周勤  袁笑一 《科技通报》2005,21(1):110-114

分子印迹是近十年发展起来的新技术,本文阐述了分子印迹技术的原理与分子印迹聚合物的制备方法,介绍了该技术在环境领域中的若干应用,提出了分子印迹技术将为环境领域的科学研究开辟一条新路等观点。  相似文献   

分子伴侣、蛋白质聚集和大分子拥挤环境对蛋白质折叠的影响     

李剑  王志珍 《中国科学院研究生院学报》2002,19(2):215-218

研究了细胞内存在的分子伴侣、蛋白质聚集和大分子拥挤环境对蛋白质折叠的影响.首先,发现分子伴侣GroEL与底物蛋白的结合有"半位"和"全位"两种模式,它是由底物蛋白的分子形状、分子大小以及与GroEL的相互作用性质决定的.接着,发现两种不同的蛋白质一起复性时相互不干扰,提示细胞内蛋白质折叠可能不受其他蛋白聚集的影响;后又发现α-乳清蛋白的前熔球态不仅是分子伴侣也是蛋白质聚集体的作用对象.最后,研究大分子拥挤环境对蛋白质折叠热力学和动力学的影响,揭示了这种影响的复杂性和多样性.  相似文献   

感知的企业社会责任对员工创新行为作用机制的实证研究     

周念华  余明阳  辛杰 《研究与发展管理》2021,33(6):111-123

在经济转型和社会发展进入新阶段,创新成为时代主旋律的大背景下,“如何激发员工创新行为”已成为当前企业人力资源管理实践最重要的问题之一。本研究从责任伦理的视角探讨了员工感知的社会责任(PCSR)对员工创新行为的影响机制。通过对671名的家族企业员工的调查研究发现：(1)PCSR会对员工创新行为产生正向的影响;(2)组织认同、工作不安全感和员工的工作投入在PCSR和员工创新行为之间起着重要的中介作用,PCSR通过影响员工的组织认同、工作安全感和工作投入进而对其创新行为产生影响;(3)本研究把PCSR分为内部和外部两个层面,并对比研究发现员工感知的内部社会责任对组织认同、工作投入和员工创新力的影响效应要显著大于员工感知的外部社会责任。本研究着眼于责任伦理的教化与感知,比较有创见性的提出责任伦理的感知和教化等软性因素是驱动创新的重要源动力和管理落脚点,丰富了关于PCSR领域的研究,也为管理实践中“如何调动员工的创新行为”提供了一个新的有益思路。  相似文献   

基于二次匹配的指纹识别方法的研究     

张航  马军 《唐山学院学报》2011,24(3):88-91

在前人的研究成果的基础上,对指纹识别的各个过程,包括指纹图像预处理、指纹图像特征点提取、指纹匹配等相关算法进行了研究。特别是在指纹图像匹配阶段,为了得到较好的效果,采用了两次匹配的过程,第一次匹配使用传统的基于特征点的匹配方法,能够迅速地去除差距很大的图片和效果较好的匹配图片,而第二次匹配使用了基于可变界限盒的串距离匹配方法,这种方法能够更好地适应指纹图像的非线性形变等情况。通过这样的两次匹配,能够得到比较满意的匹配结果。  相似文献   

Impact in the school system of a strategy for identifying and selecting academically talented students: the experience of Program PENTA‐UC     

Violeta Arancibia  María Rosa Lissi  Marigen Narea 《High Ability Studies》2008,19(1):53-65

The study explores the consequences, for participating schools, of the implementation of a system for the identification and selection of academically talented students, in the context of an extracurricular enrichment program operating at Pontificia Universidad Católica de Chile. The participants were 73 students, 50 teachers, and seven members of the school administration, in seven schools. Data were collected through interviews and focus groups. The results indicated that the identification and selection processes have mostly positive effects on teachers and students. Some potentially negative effects were also detected for the classmates of the talented students, which relate mainly to the manner in which information was handled. Possible implications of these findings for this program for talented children and other similar programs are discussed.  相似文献   

排球比赛过程风险控制研究   总被引：1，自引：0，他引：1  

张五平 《山东体育学院学报》2011,27(3):63-67

排球比赛风险是指比赛过程中导致本方技战术发挥失常、心理不稳定的各类不可控因素和突发性事件,探讨对比赛风险的控制对于球队获取胜利具有重要意义。通过构建风险识别体系和风险应对体系,并将其运用于高水平球队的训练与比赛,可有效降低比赛过程中各种风险对球队在心理稳定和技战术发挥的危害程度,从而增加制胜概率。  相似文献   

Team identification and sports fandom as predictors of fan aggression: The moderating role of ageing     

《Sport Management Review》2019,22(2):194-208

In the current study, the explored the moderating role of ageing in the relationship between team identification/fandom and fan aggression. The authors used an online panel-based survey that offered access to a realworld population of sports fans. Participants were 740 fans of Israeli professional basketball. Results from structural equation modelling demonstrated that older fans reported higher levels of mere sports fandom and lower levels of self-reported aggression and acceptance of aggression. Moreover, age moderated the relationships between team identification (or fandom) and self-reported aggression, such that team identification (or fandom) was more strongly associated with selfreported fan aggression among younger fans than among older fans. The moderating role of age in the relationships between team identification (or fandom) and perceptions of appropriateness of aggression was not supported. The findings contribute to our theoretical understanding of the role of ageing in the relationship between fan identification and fan aggression. Based on these findings, the authors assert that managers might particularly benefit from leveraging the potential, but often neglected, segment of senior fans, since older fans can play a key role in reducing the level of aggression during competitive sports events. Suggestions for future research are also discussed.  相似文献