普通高校田径运动员力量训练的研究

训练对象的不同,力量训练的方法与手段等存在明显差异。普通高校田径运动员力量基础的薄弱性、力量训练的短期效益性,以及训练计划的频繁变更性等决定了其力量训练不能机械地照搬专业队的训练模式和训练方法。本文主要运用文献资料法,对普通高校田径运动员力量训练的特点进行深入地分析,并在此基础上提出了普通高校田径运动员力量训练必须遵循的六条原则和四种训练方法,以供广大教练员参考之用。     

欧亚男排实力失衡现状思考与对策

通过对欧亚男排实力失衡现状的思考,以及对缩小欧亚男排实力差距的合理有效途径的探讨,从奥林匹克公平竞争精神出发,提出规则修改的几个具体设想.旨在通过所提出的对策,在一定程度上有效地缩小欧亚男排差距,促进世界排球运动的发展.     

视觉与本体感觉的反馈信息控制在横马分腿腾越教学中的应用与研究

本文将视觉与本体感觉的反馈信息控制应用于横马分腿腾越动作的教学中，对学生的视觉、本体感觉等反馈信息进行动态调控，并进行对比实验研究．实验结果显示：视觉与本体感觉的反馈信息控制能有效地诱导学生“寻找”完成规定动作所必须的肌肉本体感觉，加速建立正确的运动动力定型，显著地提高教学效率。     

从主动得分效果分析甲A女排实力状况

通过 2 0 0 2年甲A女排联赛的数据统计 ,对发球、扣球、拦网三项主动得分手段进行比较分析 ,揭示我国女排队伍目前主要的得分手段 ,为提高主动得分能力的训练提供参考依据     

Out of Sight, (Not Yet) Out of Mind: The Impact of Tie Strength on Direct Interaction and Social Surveillance Among Geographically Close and Long-Distance Facebook Friends

Social networking sites are considered a valuable resource to maintain existing friendships even over considerable distances. The present study emphasizes tie strength as a crucial determinant for the use of interactive and passive features among 302 active Facebook users and friends of different relational closeness (close friends vs. casual friends vs. acquaintances) as well as a moderator for the impact of physical distance. As expected, tie strength affected direct interaction linearly, whereas social surveillance followed a quadratic trend. Furthermore, moderation analyses revealed less frequent direct interaction between close friends and stronger surveillance of casual friends’ profiles as physical distance increases. These results indicate different functions in relationship maintenance for both behaviors as direct interaction aims at nurturing current relationships, while surveillance serves as a catalyst for promising future communications. As a consequence, physical distance influences direct interaction adversely due to emerging constraints but also contains informational value encouraging information-seeking behaviors.     

The effect of modifiers on the stability of a vinyl acetate/ethylene copolymer dispersion

This paper examines the effect of modifiers on the stability of a vinyl acetate/ethylene copolymer dispersion adhesive upon aging. Eighteen common modifiers were added to a well-characterized vinyl acetate/ethylene copolymer dispersion (Dur-O-Set^® E-150) in known concentrations and dry-film samples were subjected to 16–17 years of dark aging and seven to eight years of light aging. Yellowing, pH, gloss, swelling, cohesive strength, and flexibility were monitored for changes upon aging. Generally, the neat Dur-O-Set^® E-150 (no additives) was found to become acidic on aging, but was fairly resistant to yellowing. It also swelled substantially in toluene, was of high gloss, medium strength, and flexible, and remained so on aging. No modifier was found to improve these properties. Various solvents, wetting agents, and thickeners did not alter the properties by much, while plasticizers, freeze-thaw stabilizer, glycerin, and certain fillers had a more negative effect.     

闽中麻鸡肌纤维生长发育规律的研究

选择160只闽中麻鸡在相同的环境条件饲养下,分别于0、7、14、21、28、35、42日龄各随机抽取10只宰杀,研究腿肌、胸肌、翅肌肌纤维直径的变化规律.结果表明:随着日龄的增加,不同部位肌纤维的直径均显著增加(P＜0.01);不同部位肌纤维直径在不同时期发育速度不同,肌纤维发育速度与机体发育速度相关性不明显.     

体育锻炼与老年人健康

参加有规律的体育锻炼能延缓衰老引起的身体机能的下降。耐力运动有助于维持和改善心血管机能,减小心血管危险因素;力量运动能补偿衰老引起的肌肉质量和力量的下降。因此,有规律的体育锻炼能改善老年人机能能力,有助于老年人有一个更加健康、独立的生活方式。     

(0608)超强台风“桑美”的特点及成因分析

2006年第8号台风"桑美"(0608,SAOMAI)是1949年以来登陆我国大陆最强的台风,登陆时中心附近最大风力达到17级(60m·s-1),最低气压为920hPa,利用常规探测资料、地面资料、风云2C红外云图及北京T213资料,对其观测事实进行分析探讨,结果发现,"桑美"台风具有强度强、移速快、结构紧密,"个头"小、风速大、雨势猛、灾害重等特点,这些特点与大气环流的演变、影响台风的天气系统、相关物理量的分布、"桑美"本身的结构及其结构变化等有着十分密切的关系。对它进行研究具有重要的社会意义和经济意义。     

谷氨酰胺在运动免疫中的作用

谷氨酰胺免疫系统一些细胞以较高速率利用，对于这些细胞的生存及正常功能的发挥十分必要。在长时间运动后及过度训练时，血浆中谷氨酰胺浓度减少，提示持续的身体练习能影响肌肉组织对谷氨酰胺的释放，以致不能满足免疫系统对谷氨酰胺的需要，因此，血浆谷氨酰胺水平的下降造成免疫功能受损