不对称型氧化还原反应进行完全的条件及影响因素

以能斯特方程为基础,推导出不对称型氧化还原反应进行完全的判别式,并进一步探讨了影响该类反应进行完全的相关因素．对于给定的反应,主要受条件电动势和反应物浓度的影响．对主体物质微粒数减少的反应,宜在较高浓度下进行;反之,则宜在较低浓度下进行．     

广东田径竞技后备人才现状及发展对策研究

主要运用文献、访问、问卷、数理统计等研究方法，从社会学角度，对运动员、教练员、训练与科研、竞赛、“体教结合”、经费设施等方面进行调查，分析后备人才培养的现状及存在问题，并提出相应对策，旨在促进广东田径运动的持续发展。     

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.     

我国劳动力转移就业空间特点的经济问题分析

我国农村刺余劳动力转移就业形式，反映了我国的劳动力要素配置方式和效率，也影响各地区的城市化进程。从空间上看，我国劳动力转移就业存在区域差异性、空间流动性、乡村城市不连续性．对我国农业有不利影响，也使劳动力要素配置效率低下，农民工利益流失，城市化推进困难。应采取4个方面的对策，缩小区域差距，促进劳动力合理转移与与城市化水平提高。     

抗美援朝战争与我党对台政策

解放台湾,实现统一,是中共一直坚持的目标。从新中国成立到抗美援朝战争,中共坚持以武力歼灭国民党残余力量,解放台湾。然而,抗美援朝战争使中共中央面临的局势发生重大变化,中共中央被迫暂缓武力解放台湾的步伐。抗美援朝战争结束后,中共中央根据形势的变化,逐渐提出以和平的方式实现统一。     

未经训练成年男性急性运动性疲劳的电刺激研究

运用电刺激的方法研究未经训练成年男性的急性运动性疲劳机制。结果表明:在疲劳性伸膝运动后,最大随意收缩力下降17±15%(p<0.001),中枢激活水平从88±7%下降到84±6%(p=0.001),M波波幅基本不变,但电刺激诱发的最大颤搐张力和最大张力上升速度明显降低,半舒张时间延长,激活后增强效应(postactivation potentiation)下降19%(p<0.001)。疲劳过程中平均肌电图-力矩比值升高。结论:在未经训练成年男性间歇性大负荷运动导致疲劳过程中,中枢神经系统及肌肉本身均参与了运动性疲劳的形成,肌肉的兴奋性未发生明显变化,但收缩能力减弱。     

创造教育是学校体育教学改革的永恒主题

学校体育教学改革正面临从技术教学向健身教育转化，本文以创造教育的理论，以创造、发展的观点，对深化学校体育改革问题试作分析和探讨。     

利用一种新的势能函数精确计算双原子的光谱参数

A novel scheme for potential energy functions of diatomic molecules is derived using a function with phase factors. Six kinds of potential curves of common shapes are obtained by adjusting the phase factors. Spectroscopic parameters of the ground states for ten kinds of molecules are calculated using the potential energy functions. The results agree well with experimental data.     

我国冬季竞技体育后备人才资源可持续发展的对策

大力发展我国冬季竞技体育必须走可持续发展之路,而实现后备人才的可持续发展是首要之义。借鉴体育强国后备人才的培养经验,分析了冬季竞技体育后备人才开发的特点,认为冬季竞技体育后备人才可持续发展离不开与学校体育、群众体育的协调发展,并从体制、机制、培养体系、科学化培养和扩大冬季运动项目的社会影响等方面论述了实现冬季竞技体育后备人才资源可持续发展的对策。     

浅析武术散打运动员爆发力及其训练

爆发力在武术散打中的作用非常重要,是武术散打技击训练的基础。武术散打实战中,通常都是以快速击打、快速闪躲等肌肉快速活动完成技术动作的,没有柔韧,就没有速度,没有速度的力量,就产生不了爆发力。文章采用文献资料法并结合运动训练中爆发力的实际,论述了爆发力的训练方法。