椭偏光两种表示的关系式在偏振态变化分析中的应用     

余春日 《巢湖学院学报》2005,7(3):55-58

本文讨论了椭圆偏振光两种表示的关系式在偏振态变化问题中的应用.  相似文献   

相对不起诉制度初探     

栗克元 《信阳师范学院学报(哲学社会科学版)》2003,23(6):11-13

相对不起诉制度是指检察机关对于存在犯罪嫌疑且符合起诉条件的案件，依其职权而做出的一种不起诉处分。消极裁决权分割、利益居先和宽严相济是该项制度的理论基础。为了使该项制度得以贯彻，必须修改刑事诉讼法，不赋予被不起诉人的申诉权，且对于有被害人的案件，检察机关做出不起诉决定前，应征求被害人意见，赋予被害人知悉权。  相似文献   

一类矩阵的广义特征值的相对扰动定理     

詹仕林 《韩山师范学院学报》2007,28(6):1-3

研究H-normal矩阵的广义特征值的相对扰动界问题,给出规范矩阵,可对角化矩阵与复正定矩阵的广义特征值在算子范数下的相对扰动界。  相似文献   

数据包络分析在教学管理中的应用研究   总被引：3，自引：0，他引：3  

施文  叶强  谢晓来  冯英浚 《现代远距离教育》2003,(2):43-45

本文讨论了应用数据包络分析方法对教师的教学效果进行评价的问题。文中指出，将教师所教班级的学生成绩直接作为教学效果评价指标的这一传统做法存在看无法消除初始条件差异的缺点。为此，本文将用于评价管理有效性的DEA二次相对效益值法引入到教学效果的评价中，并结合一个实例进行了讨论。  相似文献   

Coaches’ implicit associations between size and giftedness: implications for the relative age effect     

Philip Furley  Daniel Memmert 《Journal of sports sciences》2016,34(5):459-466

The relative age effect (RAE) is a well-established phenomenon in education and sports. Coaches have been assumed to be important social agents of RAE via biased selection decisions in favour of children with maturation advantages. In the present research, we used the Implicit Association Test to investigate automatic associations between body size and a player’s domain-specific giftedness amongst youth baseball (N = 18) and youth soccer coaches (N = 34). We found medium to strong automatic associations between body size and player giftedness (baseball: M_D = 0.62; soccer: M_D = 0.51). Specifically, taller players were associated with positive performance-related attributes, whereas smaller players were associated with negative attributes. The results are in line with theories of grounded cognition by showing that the abstract concept of “sport giftedness” is partly grounded in the perception of physical height amongst youth sports coaches. We argue that this grounded cognition has the potential to influence coaches’ selection decisions and in turn account for RAE as coaches are biased towards physically more matured players, even when no apparent performance advantage is evident.  相似文献   

Inter-joint coordination between hips and trunk during downswings: Effects on the clubhead speed     

Ahnryul Choi  In-Kwang Lee  Mun-Taek Choi 《Journal of sports sciences》2016,34(20):1991-1997

Understanding of the inter-joint coordination between rotational movement of each hip and trunk in golf would provide basic knowledge regarding how the neuromuscular system organises the related joints to perform a successful swing motion. In this study, we evaluated the inter-joint coordination characteristics between rotational movement of the hips and trunk during golf downswings. Twenty-one right-handed male professional golfers were recruited for this study. Infrared cameras were installed to capture the swing motion. The axial rotation angle, angular velocity and inter-joint coordination were calculated by the Euler angle, numerical difference method and continuous relative phase, respectively. A more typical inter-joint coordination demonstrated in the leading hip/trunk than trailing hip/trunk. Three coordination characteristics of the leading hip/trunk reported a significant relationship with clubhead speed at impact (r < ?0.5) in male professional golfers. The increased rotation difference between the leading hip and trunk in the overall downswing phase as well as the faster rotation of the leading hip compared to that of the trunk in the early downswing play important roles in increasing clubhead speed. These novel inter-joint coordination strategies have the great potential to use a biomechanical guideline to improve the golf swing performance of unskilled golfers.  相似文献   

Mechanical energy generation and transfer in the racket arm during table tennis topspin backhands     

Yoichi Iino  Takeji Kojima 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(2):180-197

The ability to generate a high racket speed and a large amount of racket kinetic energy on impact is important for table tennis players. The purpose of this study was to understand how mechanical energy is generated and transferred in the racket arm during table tennis backhands. Ten male advanced right-handed table tennis players hit topspin backhands against pre-impact topspin and backspin balls. The joint kinetics at the shoulder, elbow and wrist of the racket arm was determined using inverse dynamics. A majority of the mechanical energy of the racket arm acquired during forward swing (65 and 77% against topspin and backspin, respectively) was due to energy transfer from the trunk. Energy transfer by the shoulder joint force in the vertical direction was the largest contributor to the mechanical energy of the racket arm against both spins and was greater against backspin than against topspin (34 and 28%, respectively). The shoulder joint force directed to the right, which peaked just before impact, transferred additional energy to the racket. Our results suggest that the upward thrust of the shoulder and the late timing of the axial rotation of the upper trunk are important for an effective topspin backhand.  相似文献   

智能化电机测功机实验装置的研制   总被引：1，自引：0，他引：1  

王宝军  丁轶成 《实验室研究与探索》2003,22(4):91-92,99

对他励式电机测功机进行研究，研制出电机测功机实验装置，并设计出单片机数据采集系统对电机转矩进行智能化测量，为学生电机实验提供了良好的条件。  相似文献   

可及性等级假设与英语关系分句的习得     

王加林 《广东技术师范学院学报》2007,(11)

本文试从中英两种语言表达关系分句结构的不同入手,分析了英语关系分句是中国学生习得的一个难点,从语料库中获取中国大学生习得英语关系分句数据进行分析研究,得出英语关系分句的习得与可及得性等级假设存在正相关,但假设中的间接宾语关系分句和所属格关系分句的分类存在问题,假设必须进行修改才具科学性。  相似文献   

论合伙的法律地位     

闫博慧  张昭庆 《廊坊师范学院学报》2007,23(5):77-80

随着我国经济体制的改革,合伙的法律地位越来越受到民商法学界的广泛关注。通过对合伙概念和特征的研究,可以得知合伙是一种民事主体,且是一种具有相对独立性的民事主体。  相似文献