Coordination pattern of baseball pitching among young pitchers of various ages and velocity levels     

Hsiu-Hui Chen  Chiang Liu  Wen-Wen Yang 《Journal of sports sciences》2016,34(17):1682-1690

This study compared the whole-body movement coordination of pitching among 72 baseball players of various ages and velocity levels. Participants were classified as senior, junior, and little according to their age, with each group comprising 24 players. The velocity levels of the high-velocity (the top eight) and low-velocity (the lowest eight) groups were classified according to their pitching velocity. During pitching, the coordinates of 15 markers attached to the major joints of the whole-body movement system were collected for analysis. Sixteen kinematic parameters were calculated to compare the groups and velocity levels. Principal component analysis (PCA) was conducted to quantify the coordination pattern of pitching movement. The results were as follows: (1) five position and two velocity parameters significantly differed among the age groups, and two position and one velocity parameters significantly differed between the high- and low-velocity groups. (2) The coordination patterns of pitching movement could be described using three components, of which the eigenvalues and contents varied according to age and velocity level. In conclusion, the senior and junior players showed greater elbow angular velocity, whereas the little players exhibited a wider shoulder angle only at the beginning of pitching. The players with high velocity exhibited higher trunk and shoulder rotation velocity. The variations among groups found using PCA and kinematics parameter analyses were consistent.  相似文献   

欧美出版社开放存取期刊论文处理费研究   总被引：1，自引：0，他引：1  

余敏 《出版科学》2016,24(5):106-110

论文处理费伴随着开放存取期刊的出现而进入公众视野。20世纪末,开放存取期刊由于没有成熟的商业盈利模式,国际上知名的出版社均对这种新型数字出版方式表示过疑虑。而现今,传统出版集团相继发行各自的开放存取平台,这主要得益于论文处理费的推行。本文介绍欧美各大知名出版社旗下开放存取期刊论文处理费的相关收费情况,分析论文处理费收取的完整体系,以期为国内学术期刊开放存取平台的发展提供策略建议。  相似文献   

论亚里士多德的"第一推动者"     

莫斌 《宜宾学院学报》2006,6(4):8-10

《物理学》中的“第一推动者”是在自然哲学内作为实体的不动的推动者,而《形而上学》中的“第一推动者”是在“理性-神”作为实体意义上来表述的。亚氏通过对“第一推动者”的论述,完成了从自然哲学到形而上学的过渡。  相似文献   

Coming to know about the body in Human Movement Studies programmes     

Valeria Varea  Richard Tinning 《Sport, Education and Society》2016,21(7):1003-1017

This paper explores how a group of undergraduate Human Movement Studies (HMS) students learnt to know about the body during their four-year academic programme at an Australian university. When students begin an undergraduate programme in HMS they bring with them particular constructions, ideas and beliefs about their own bodies and about the body in general. Those ideas and beliefs are often challenged, disrupted or reinforced according to discourses and practices to which students are exposed and which they experience throughout their programme of study. The courses that these students take in their in HMS degree programme present to them different perspectives about health and the body. Some perspectives take the status of taken-for-granted truths and others are dismissed or ignored. Taking a Foucauldian perspective, this paper explores the dominant discourses and practices to which this group of students was exposed during their four years of academic formation, and the influences that this exposure might have upon their construction of the body and their formation as pre-service Health and Physical Education (HPE) teachers. The participants in this study were 14 students, 11 females and 3 males, aged between 18 and 26 at the time of the first interview. The data used for this paper were taken from a larger study and were analysed using a content analysis approach. Results suggest that some students may be heavily influenced by certain practices and discourses during their programme of studies, and that they embody dominant discourses of health. Furthermore, a possible change of thinking may occur across their academic programme, as a consequence of their engagement with a few alternative discourses presented during their academic programme, disrupting some of their previous beliefs and knowledge.  相似文献   

高校体育专业网上选课系统研究     

李志杰  贾彦 《周口师范学院学报》2007,24(5):135-137

对高校体育专业选修课程模式进行研究，运用ASP语言实现动态网页效果，研制体育专业网上选课管理系统.系统开发采用了结构化设计思想，通过对Access数据库的处理，能够达到和满足使用者的要求.  相似文献   

X marks the spot: Creating and managing a single service point to improve customer service and maximize resources     

Mary Ann Venner 《Journal Of Access Services》2016,13(2):101-111

ABSTRACT

This article will describe how merging service points in an academic library is an opportunity to improve customer service and utilize staffing resources more efficiently. Combining service points provides libraries with the ability to create a more positive library experience for patrons by minimizing the ping-pong effect for assistance. The Access Services Department at the University of North Texas Libraries was charged with management of the circulation and reference services offered at the service desk. Streamlined planning and modernized management of the desk and its impact on customer service in a changing library environment will be discussed.  相似文献   

Enhancing Teaching and Learning: Libraries and Open Educational Resources in the Classroom     

Erin Davis  Dory Cochran  Britt Fagerheim  Becky Thoms 《Public Services Quarterly》2016,12(1):22-35

Academic libraries continually adjust services to adapt to the ever-changing landscape in higher education. In response to the broken textbook market, libraries are becoming actively involved in the open educational resources (OER) movement. Although there is not a formal program in place, librarians at Utah State University explored a collaborative approach to integrate OER in faculty members' courses. One goal of the effort was to work closely with faculty to consider course objectives and learning outcomes when evaluating and incorporating OER. This article identifies a streamlined process for targeting courses most suited for OER adoption and outlines a process of collaborating with teaching faculty to integrate relevant OER. The paper includes a detailed workflow that other libraries can easily adapt to make OER part of their faculty outreach toolkit.  相似文献   

开放教育考试管理模式研究     

谢红武 《宜春学院学报》2007,29(5):83-85,135

开放教育考试管理模式是在开放教育形式基础上衍生的一种新型的考试管理模式。针对我国当前教育考试管理模式现状,提出开放教育考试管理模式改革的内容,方法,类型以及相应的改革思路。  相似文献   

试论义和团运动对中国早期现代化进程的作用     

张运杰 《柳州师专学报》2001,16(1):61-65

探讨了义和团运动对中国早期现代化进程所起的作用 ,义和团运动加速了中国资产阶级民主革命的迅速到来 ,客观上为民族资本主义工业发展创造了条件 ,并促使了中国社会意识形态的全面变革  相似文献   

高校信息管理系统的安全关键技术     

史姣丽  胡日新 《九江师专学报》2007,26(3):30-32,37

高校信息管理系统面临的安全威胁问题日趋多样化和复杂化，系统通过统一身份认证、访问控制、数字签名等一系列安全技术设计并实现了实用有效的安全防范机制，为高校信息化办公提供有力的保证。  相似文献