联考机制下合训毕业学员军事体育组训优化探究

2011年,全军院校开始实行军事共同科目联考.具体由“合训”与“分流”院校分别抽调专家组成联合考核组实施.为促进军事体育教学训练,提高联考通过率,从训练原则、训练计划、组织实施、预防损伤上,就如何提高体能、技能水平提出了相应对策.     

男大学生体成分与脑血流速度相关性研究

探讨身体成分与脑血流速度（Cerebral Blood Flow Velocity,CBFV）的关系,以便揭示体脂对CBFV的影响。方法：以10名男大学生为实验对象,应用经颅多普勒技术检测了其安静时的大脑中动脉血流速度和采用In Body身体成份分析仪测试了其身体成分,然后对CBFV和身体进行了相关分析。结果：大脑中动脉收缩期峰速度（Vp）、舒张期末峰速度（Vd）和平均峰速度（Vm）分别与其体脂、体脂百分数和体重指数（BMI）呈显著负相关;而大脑中动脉的搏动指数（PI）分别与体脂百分数和BMI呈显著正相关。结论：体脂对CBFV有显著的负面影响,体脂增多,CBFV降低。     

c-幂零群与幂零群

为研究有限群的幂零性,利用群的不可约特征标,定义一类新群——c-幂零群.给出一个群G为c-幂零群的充分必要条件:对G的每个不可约特征标χ∈Irr(G),只要Kerχ∈Δ,就有G/Kerχ为c-幂零群.讨论c-幂零群与幂零群之间的关系.     

健美操运动中“民”的群体性特征

健美操运动在其发展过程中已经逐渐融入到民众的日常生活当中,成为人们的一种"健康生活方式",并形成了自身庞大的"民"。文章主要分析并概括了这一"民"的群体性特征,即泛群性、先赋分群性和性别群倾性。     

现代别墅群的综合防雷措施浅析

通过对别墅群建筑的特点以及防雷实践工作中遇到的设计施工问题进行分析,就其在分类、接闪、接地、跨步电压、闪电电涌侵入方面提出了相应的防雷措施。     

基于职业能力培养的高职机械专业基础课群教学改革的研究与实践

论述基于职业能力培养的高职机械专业基础课群教学改革势在必行：构建与职业岗位相适应的机械行业基础平台;并通过优化教学过程,有效培养学生的职业能力。     

施斗姆定理证明的探讨

介绍了施斗姆定理的一种证明方法,通过这种证明使我们更易理解施斗姆定理的含义,掌握施斗姆定理,从而达到运用施斗姆定理讨论多项式实数根的目的．     

Teamwork in sport: a theoretical and integrative review

A commonly held belief in sports is the need for team members to be able to work well together in order for that team to be successful. Despite this assumption, research in the field of sport psychology has yet to formally or sufficiently conceptualize what is meant by teamwork. In this theoretical and integrative review, we draw from the extant organizational psychology and team development literature to present a multidimensional conceptual framework of teamwork in sport. We provide a working definition of teamwork in sport and discuss how teamwork sits within a broader model of team effectiveness. We conclude by providing an overview of salient research avenues on teamwork and team effectiveness in sport, which have potential implications for guiding interventions with sports teams.     

Effects of load on ground reaction force and lower limb kinematics during concentric squats

The purpose of this study was to examine the effects of external load on vertical ground reaction force, and linear and angular kinematics, during squats. Eight males aged 22.1?±?0.8 years performed maximal concentric squats using loads ranging from 7 to 70% of one-repetition maximum on a force plate while linear barbell velocity and the angular kinematics of the hip, knee and ankle were recorded. Maximum, average and angle-specific values were recorded. The ground reaction force ranged from 1.67?±?0.20 to 3.21?±?0.29 times body weight and increased significantly as external load increased (P?<?0.05). Bar linear velocity ranged from 0.54?±?0.11 to 2.50?±?0.50?m?·?s^?1 and decreased significantly with increasing external load (P?<?0.05). Hip, knee and ankle angles at maximum ground reaction force were affected by external load (P?<?0.05). The force?–?barbell velocity curves were fitted using linear models with coefficients (r ²) ranging from 0.59 to 0.96. The results suggest that maximal force exertion during squat exercises is not achieved at the same position of the lower body as external load is increased. In contrast, joint velocity coordination does not change as load is increased. The force?–?velocity relationship was linear and independent from the set of data used for its determination.