射箭技术评价指标的综合研究

方法:运用Qualisisy红外光点测试系统、Footscan足底压力测试系统、Noraxon肌电遥测系统等对国家队射箭队运动员进行测试,对运动员的射箭动作技术进行分析。结论:1)姿态角、肌肉用力激活程度、举弓阶段主要用力肌肉激活顺序、举弓、开弓时间等的一致性可作为射箭技术评价指标;2)各动作阶段所用时间的长短不能作为技术评价指标,但开举弓时间比与中国国家队射箭成绩正相关;3)基础平衡的足底压力中心指标可作为身体素质、选材及成绩预测的参考依据;4)射箭运动员实射时身体在前、后方向上的稳定性较差,主要与腹背肌力量的不均衡及没有专业运动鞋有关;5)运动学及肌电学都表明,中国射箭训练对举弓、开弓阶段的重视不够,背部肌肉用力特征不明显,撒放技术合理性不高。建议:1)快节奏只是个别运动员的特点,不能因为团体比赛时限缩短而过多强调快节奏。2)采用振动法或不稳定支撑面的力量训练方法进行力量训练。因为这两种训练方法不仅可增加肌肉力量,而且可使神经肌肉的协调性、本体感受器得到训练,从而增强对射箭动作的感觉能力;3)为射箭运动员定制或选择有防滑块鞋底、前后上翘程度符合运动员脚型特点的射箭专用鞋。     

基于五大发展理念的水利水电工程移民政策评价——以《大中型水利水电工程建设征地补偿和移民安置条例》为例

基于五大发展理念对《大中型水利水电工程建设征地补偿和移民安置条例》(国务院471号令)移民政策的进步性、局限性、制度合理性和实践合理性进行评价,有助于条例的修订完善及水利水电移民事业健康发展.471号令相对于74号令在各个方面都有了较大的进步,但一些条款已经不能适应发展要求,需在五大发展理念的指导下进行完善:移民管理体制要从"管理"转变为"治理",实现创新发展;要进一步明确项目法人与地方政府的权责,实现协调发展;要将生态文明建设、美丽中国建设的新要求贯彻到移民工作中,实现绿色发展;要消除部门立法、行业保护的影响,实现开放发展;要更多地让利于移民及安置区群众,实现共享发展.     

Relationship Understanding Between Emotional Stability,Self-Disclosure and Social Adjustment

This paper discusses a survey, carried out by the authors, of 211 employees’ employed in public and private manufacturing organizations in North India to determine if emotional stability acts as a mediator between self-disclosure and social adjustment. Capitalization theory has been used as theoretical framework to examine the proposed relationships. Results indicate that high self-disclosure has positive association with social adjustment. Results also suggest that emotional stability partially mediates self-disclosure and social adjustment relationship. Implications for future research include further examination through additional mediators and other dimensions of self-disclosure from capitalization theory in understudied non-U.S. cultures like India.     

Postural stability,clicker reaction time and bow draw force predict performance in elite recurve archery

Recurve archery is an Olympic sport that requires extreme precision, upper body strength and endurance. The purpose of this research was to quantify how postural stability variables both pre- and post-arrow release, draw force, flight time, arrow length and clicker reaction time, collectively, impacted on the performance or scoring outcomes in elite recurve archery athletes. Thirty-nine elite-level recurve archers (23 male and 16 female; mean age?=?24.7?±?7.3 years) from four different countries volunteered to participate in this study prior to competing at a World Cup event. An AMTI force platform (1000Hz) was used to obtain centre of pressure (COP) measurements 1s prior to arrow release and 0.5s post-arrow release. High-speed footage (200Hz) allowed for calculation of arrow flight time and score. Results identified clicker reaction time, draw force and maximum sway speed as the variables that best predicted shot performance. Specifically, reduced clicker reaction time, greater bow draw force and reduced postural sway speed post-arrow release were predictors of higher scoring shots. It is suggested that future research should focus on investigating shoulder muscle tremors at full draw in relation to clicker reaction time, and the effect of upper body strength interventions (specifically targeting the musculature around the shoulder girdle) on performance in recurve archers.     

卵磷脂稳定性的研究进展

在卵磷脂结构和性质介绍的基础上,综述了来源、贮存方式和生产工艺等对卵磷脂稳定性影响的研究现状与进展,并对提高卵磷脂稳定性的途径进行了阐述和展望。     

开流格点的时空不可约周期结构

指出了在开流格点中，存在着时间空间不可约周期结构。并通过对初始稳定性和边界稳定性的分析，证明了该结构的稳定性。其数值结果表明了理论分析的正确性。     

影响跳马落地稳定性心理因素的研究

本文对跳马落地过程中造成落地不稳定的主要心理因素进行了研究,有一定实践指导意义。     

General and Specific Factors in Reading Comprehension

One explanation for why many students routinely choose to do their homework with a radio or TV operating is that this distraction facilitates studying. To investigate the validity of this explanation, the authors carried out two experiments with sixth-grade students who worked on two difficulty levels of individualized mathematics assignments (N = 12) and reading assignments (N = 9) under three distraction conditions: quiet; self-selected, self-regulated radio; and self-selected, self-regulated TV. The data yielded no evidence of sizable distractor effects on students' time spent studying, computational accuracy, reading comprehension, or reading rate. These results generally are consistent with the theoretical conceptualization of attention as flexible and adaptable.     

静力学原理在武术动作中的应用

文章运用生物力学分析法,对武术动作中的静力学原理进行了分析。从静力学的角度和人体维持平衡的特殊性等方面探讨了影响武术动作稳定性的几个因素,并对其在武术动作中的运用规律进行研究,以丰富武术教学与训练的理论体系,从而为教练员、运动员的套路编排和训练提供依据。     

异核两组分玻色-爱因斯坦凝聚体中矢量孤子的动力学性质

本文基于准一维异核两组分玻色-爱因斯坦凝聚体的Gross-Pitaevskii（GP）方程,通过数值方法研究了亮-亮孤子和亮-暗孤子在不同的相对相位下的碰撞问题。没有外部势阱的束缚时,若亮-亮孤子的相对相位是π,它们会产生完全弹性碰撞,当相对相位是π2时亮-亮孤子对碰撞会产生能量的转移。若存在外部势阱,其相对相位为π时亮-亮孤子对产生了周期性碰撞,而相对相位是π2时亮-亮孤子对碰撞合并成一个孤子,并伴随有能量逃逸。对于亮-暗孤子,其相对相位为0或π时第一组分的亮-亮孤子对均发生了周期性碰撞,不同的是前者有一个碰撞点,后者则有两个碰撞点。进而,通过求解相应的Bogoliubov-de Gennes方程研究发现亮-亮孤子总是稳定的,而暗-暗孤子不稳定。