关于短跑运动员服用甲壳素提高运动能力的研究

观察了短跑运动员服用甲壳素(Chitin)前后,机体在激烈运动后血乳酸浓度的变化。实验表明:通过服用甲壳素短跑运动员在运动过程中血乳酸浓度有显著的降低、运动成绩有所提高,短跑运动员服用甲壳素后能提高运动能力。     

女大学生骨质状况调查与相关影响因素分析

为了解女性大学生的骨质状况,探索影响骨峰值的相关因素,对苏州地区199名女性大学生的前臂和跟骨骨密度、形态学指标、身体机能指标进行了测试,并对月经状况和体育锻炼情况进行了调查。研究结果表明,女性大学生的骨健康状况不容乐观,苏州地区女性大学生的骨密度均值低于全国同龄女性;体脂肪量、上臂皮褶厚度、克托莱指数与骨密度呈显著正相关;握力、平衡能力、月经状况和体育锻炼,是骨量生长期女性骨密度的有效影响因子。     

谈排球传球的预备手型教学

针对当前排球教学中忽视传球的预备手型的问题，从解剖学和力学的角度对预备手型进行了分析，指出了其在正确掌握正面上手传球技术中的重要作用，并进一步研究了在预备手型教学过程中应注意的问题。     

骨密度的测定方法及影响因素

介绍骨密度测量的常用方法,并系统划分影响骨密度的因素。判断骨密度与年龄的关系,为青少年的年龄推断提供依据,得出骨密度随着年龄的增长而出现与年龄相关的骨质量减少。根据测量青少年的骨密度来解释为什么男孩在青春期后期比女孩发育得快;特别对女性进行调查发现,体重与瘦组织和脂肪组织在男女各个部位的骨密度都有一定的相关性;体育锻炼对其骨质量峰值期和衰老下降期的影响及运动负荷与骨质量的关系,发现女性在绝经后期骨质量快速下降。老年退行性骨质量丢失和绝经后骨质量丢失的综合效应以及峰值骨质量低于男性的特点,使得老年妇女骨质疏松发生的危险性高于任何人,雌激素水平低下是长期的剧烈运动训练引起骨密度偏低的主要原因。     

现代足球比赛边路传中基本特征的分析研究

通过对16届世界杯足球赛决赛阶段60场120队次,边路传中的传球区域、传球目标区域及两者比例关系等技术指标的统计分析,探索现代足球比赛边路进攻中,边路传中的基本特征,研究结果表明,2、3区为最佳传中区域.A、C区是较理想的传中目标区.     

气功锻炼对老年人骨密度影响的试验与研究

本文通过对老年人参加香功锻炼的试验、测试，并采用ＳＰＡ─４型骨矿分析仪以单光子吸收法测试获得骨密度有关重要指标数据，通过定量研究对比分析和统计学处理，就气功锻炼对影响老年人骨密度的诸因素从中医、西医、运动生物学科、体育理论等学科角度进行了较深入地探讨和研究。     

Peer-Based Supplemental Instruction in STEM: Differences in Effectiveness Across Transfer and Nontransfer Undergraduates

Although there is a large body of research on the effectiveness of supplemental instruction for college undergraduates, very little of it has focused on transfer students, who often confront additional sources of stress and historically perform more poorly than their native student counterparts. In this study, we investigated the effectiveness of a peer-based supplemental instructional program in general and organic chemistry at a large state university over a six-year period, while considering differences across transfer and nontransfer students. The results suggest that the supplemental instruction improved outcomes overall but that nontransfer students benefit to a greater degree than transfer students, in the form of higher grades and pass rates, from attending supplemental instruction. The results suggest that peer-based supplemental instruction is a useful method to improve undergraduate student performance in chemistry, but more research is needed on ways to enhance the effectiveness of interventions in improving the performance of transfer undergraduate students in STEM fields.     

The academic engagement of White and ethnic minority students in distance education

At UK institutions of higher education, the academic attainment of White students tends to be higher than that of students from other ethnic groups. A postal survey of Open University students found very little difference in academic engagement in those from different ethnic groups. The differences in pass rates and course grades remained statistically significant even when any effects of differences in academic engagement had been controlled. This is consistent with previous findings that quantitative variations in the attainment of students from different ethnic groups are not reflected in concomitant qualitative variations in their experience of higher education. The explanation for the attainment gap in ethnic minority students must be sought elsewhere than in the nature of their experience of higher education.     

锂离子电池无水电解质锂盐的研究进展

综述了近年来在锂离子电池无水电解质研究与探索方面的成果,介绍了锂离子电池无水电解质锂盐的电化学性能与结构的关系,并介绍了无水电解质锂盐的量子化学计算研究进展。     

个性化跨语言学术搜索技术研究

学术搜索引擎是一种行业化的搜索引擎,但因其缺乏个性化的服务,使得用户的学术文献检索效率低下,海量的数字学术资源得不到充分利用.本文使用Google翻译,研究基于机器翻译的中、英、俄、法和西班牙等五个语种跨语言学术检索.在跨语言学术搜索的基础上研究个性化检索技术,提出一种基于聚类的个性化信息检索方法:通过观察用户对搜索结果聚类的点击行为,生成并更新用户实时兴趣模型,采用余弦夹角公式计算用户实时兴趣模型与搜索返回结果的相似度,根据相似度大小,为用户提供个性化重排序的搜索返回结果.实验结果证明了提出方法的有效性.