论登记备案制度对房屋租赁合同效力的影响

本文论述了我国关于房屋租赁合同中的登记备案制度的内涵及实质 ,并阐述了该制度对房屋租赁合同效力的影响。     

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.     

青少年男子铅球运动员施力特征探析

采用三维数字测力铅球仪对青少年运动员在整个投掷过程中的施力特征与动作技术特征进行分析,结果表明:(1)在完整推铅球动作过程中运动员对铅球的作用力曲线与铅球速度变化趋势基本一致,在最后用力动作过程中,合力曲线呈“双峰型”;(2)在最后用力开始左脚着地瞬间力值逐渐增大,到右腿蹬转使运动员身体由侧对投掷方向转为正对投掷方向瞬间出现第一次峰值;在推掷臂肘关节夹角约为90°时出现第二次峰值。     

关于加快黄冈市农村劳动力转移的思考

加快农村劳动力转移,是现阶段促进农民增收,从根本上解决“三农”问题的一条重要途径。本文就如何加快黄冈市农村劳动力转移就业作了一些探索和思考。     

中国农村体育发展的质层文化力分析——农民体育思想对农村体育的影响探究

经济力、政治力、文化力是中国农村体育发展不可或缺的动源,笔者认为其发展方向目前受文化力影响较大。运用文献资料、问卷调查等研究方法,分析出质层文化力是潜于农村体育的物力、器材、制度层面之下并调控外在因素特征演化的决定性动源,而农民体育思想是农村体育质层文化力的主要因子。同时分析了娱乐体育思想曾在一段时期里促进了农村体育的发展,但新的娱乐方式的出现对农村体育的发展造成了冲击。对比分析农村健身文化力与娱乐文化力的基础上,归纳出农村体育如果有质的跃进,必须实现农民体育思想由娱乐向健身的迈进。文末分析了健身文化力的形成途径。     

Effects of roller burnishing process parameters on surface roughness of A356/5%SIC composite using response surface methodology

In this study, a simple roller burnishing tool was made to operate burnishing processes on A356/5%SIC metal matrix composite fabricated by electromagnetic stir casting under different parameters. The effects of burnishing speed, burnishing force and number of burnishing passes on the surface roughness and tribological properties were measured. Scanning electron microscopy （SEM） graphs of the machined surface with PCD （insert-10） tool and roller burnished surface with tungsten carbide （WC） roller were taken into consider- ation to observe the surface finish of metal matrix composites. The mechanical properties （tensile strength, hardness, duc- tility） of A356/5%SIC metal matrix composites were studied for both unburnished samples and burnished samples. The results revealed that the roller burnished samples of A356/ 5%SIC led to the improvement in tensile strength, hardness and ductility. In order to find out the effects of roller bur- nishing process parameters on the surface roughness of A356/ 5%SIC metal matrix composite, response surface methodol- ogy （RSM） （Box-Behnken design） was used and a prediction model was developed relevant to average surface roughness using experimental data. In the range of process parameters, the result shows that roller burnishing speed increases, and surface roughness decreases, but on the other hand roller burnishing force and number of passes increase, and surface roughness increases. Optimum values of burnishing speed （1.5 m/s）, burnishing force （50 N） and number of passes （2） during roller burnishing of A356/5%SIC metal matrix com- posite to minimize the surface roughness （predicted 1.232 μm） have been found out. There was only 5.03% error in the experimental and modeled results of surface roughness.     

格式塔与西方现代绘画的结构之力

形的表现性存在于力的结构中并通过同构被感知。绘画中的结构之力是一种动力性质的集合力的综合体现,不论是具有倾向性的张力结构,还是不动之动的均势之力,或是追求动作力度的行为之力,都是一种动力性质的张力集合。在绘画创作和欣赏中,我们需要对这种综合力进行整体把握和判断,抓住结构之力的运动旋律与构成规律,揭示张力结构背后的情感构造,才能最终达到作品力的结构与人类情感结构的共鸣。     

对跳远运动员起跳腿不同高度跳深的实验研究

为探寻反应力量对跳远成绩的影响因素,本文以20名男子跳远专项运动员为实验对象,进行不同下落高度的单腿跳深的测力台实验。将采集、处理后的数据与跳远成绩进行的相关分析,实验结果显示:运动员的适宜下落高度(R=0.742,P0.05)、适宜下落高度的F/体重/AB(R=0.788,P0.01)与跳远成绩呈显著性相关关系。     

论邓小平对马克思人的全面发展理论的继承和发展

马克思人的全面发展的理论是马克思主义理论的重要组成部分。人的发展是社会发展的主题,人类社会发展的最终目标是要实现人的全面自由发展。邓小平根据现阶段我国的基本国情,提出社会主义初级阶段人的全面发展首先应以“四有”为标准,使人的全面发展更为现实化、具体化。他大胆探索实现人的全面发展的途径和方法,继承和发展了马克思关于人的全面发展的学说。     

主体创造性思维中的心理定势效应

创造性思维是人类区别于动物的最根本的标志。研究它的内在机制的重要意义和最终目的在于使人类创造力的发展从自我走向自觉,从而尽可能挖掘出人类的创造潜力。本文认为“心理定势效应”是创造性思维的内在机制,并从它的研究历史、界定、动作流程以及它在主体创造性思维中的正负效应等方面进行了深入探讨,以求对个人和社会创造潜力的发掘有所裨益。