碳纤维加固钢筋混凝土柱试验研究与应用

碳纤维加固混凝土柱通过横向约束作用,提高柱的轴心受压承载力,增加柱的延性。利用碳纤维材料作围套加固混凝土轴心抗压柱,具有施工简单、抗腐蚀能力强、约束效果好等优点。     

Endurance tests are the most reliable core stability related measurements

PurposeTo determine the intra-tester reliability of clinical measurements that assess five components related to core stability: strength, endurance, flexibility, motor control, and function.MethodsParticipants were 15 college-aged males who had not suffered any orthopedic injury in the past year. Core strength measurements included eight isometric tests and a sit-up test. The four core endurance tests were the trunk flexor test, trunk extensor test, and bilateral side bridge tests. Flexibility tests included the sit-and-reach test and active range of the trunk and hip joint motions. Proprioception via passive reposition tests of the hips and a single limb balance test on an unsteady platform were used to evaluate core motor control. Functional measurements consisted of a squat test and a single leg hop test for time and distance. Measurements were performed during two data collection sessions with a week's rest between the sessions. Intra-class correlation coefficients were calculated to establish reliability.ResultsThe overall intra-rater reliability for all core stability related measurements ranged from low (ICC = 0.35, left hip reposition) to very high (ICC = 0.98, sit-and-reach). As a group, the core endurance tests were observed to be the most reliable.ConclusionThere are highly reliable tests in each of the five groups. Overall, core endurance tests are the most reliable measurements, followed by the flexibility, strength, neuromuscular control, and functional tests, respectively.     

关系强度对联盟企业知识治理的影响研究——联盟能力和知识吸收能力的双中介作用

根据所构建的"关系强度—成员能力—知识治理"研究框架进行了实证研究.首先,分析关系强度对联盟企业正式和非正式知识治理的影响;其次,从外部与内部两种视角入手,构建双中介模型,考察联盟能力和知识吸收能力在此影响过程中的中介作用,从两种路径剖析关系强度影响联盟企业知识治理的作用机制.研究发现,关系强度对联盟企业正式和非正式知识治理均存在正向影响;联盟能力和知识吸收能力在关系强度影响联盟企业正式和非正式知识治理过程中均起到部分中介作用,验证了成员能力的双中介路径.     

从第42届世界体操锦标赛中国女子体操队实力评析

采用文献资料法、数理统计法等研究方法对第42届世界体操锦标赛中国女队与世界强队各项比赛成绩进行对比研究,客观分析了中国女子体操队的实力状况。结果表明：平衡木难度价值有待提高,缺少高难度空翻,高低杠动作类型单一;腿部力量差是跳马与自由体操仍为弱项的根本原因;完成优势减弱、弱项差距大和稳定性差是导致中国女队总体技术实力与世界强队存在较大差距的重要因素。     

《修竹篇序》——唐诗革新的宣言

《修竹篇序》是陈子昂的诗歌理论纲要,也是唐诗革新的著名宣言。短序主张＂兴寄＂和＂风骨＂,一扫齐梁以来的宫廷形式主义文风。《登幽州台歌》、《感遇》三十八首等便是陈子昂践履自己诗歌理论的代表作。     

The evaluation of selected poly(vinyl acetate) and acrylic adhesives: A final research update

Abstract

The final report on the Canadian Conservation Institute's poly(vinyl acetate) and acrylic adhesive research is given after 25–27 years of dark aging and 12–15 years of light aging. A total of 27 poly(vinyl acetate) and 25 acrylic adhesives were tested for pH, volatile emissions (mostly acetic acid), flexibility, strength, and yellowing after aging. In 1996, the work was first published after three to five years of aging data had accumulated. Measurements for pH, yellowing, strength, and flexibility were recently repeated again and these results are reported here. These new data points are reported to provide insight into the effect of these longer aging periods on the products included in the study. As well, the most stable (according to set criteria) poly(vinyl acetate) and acrylic adhesives tested are revealed, which, except for a few products, do not differ greatly from those reported in 1996.     

论跳跃运动员的力量训练

跳跃运动员的力量训练应按照基础力量、最大力量、速度力量、(转变为专项爆发力和专项力量)、力量的发挥和结束等五个阶段进行。局部力量的发展必须为整体力量的提高服务。     

现代高水平运动员力量训练分期的研究

采用了文献法、个案研究法和调查法等研究方法,对高水平运动员力量训练的周期安排进行分析研究。结果表明,高水平运动员的力量训练具有鲜明的周期性特征,与运动员整个训练周期是密不可分的;力量训练计划的目标、内容、方法在整个全年计划的各训练阶段都是不断变化着的。     

从最近3届世界健美操锦标赛探讨我国竞技健美操的实力与差距

用献资料法、调查访问法、录像资料法等科研方法对我国参加的3次世界健美操锦标赛的成绩及表现进行分析研究，指出目前我国竞技健美操运动存在的主要问题，以及产生这些问题的原因，并提出一些未束发展的建议，以期为我国竞技健美操运动的发展提供参考依据。     

刍议200米混合泳的动作频率与体力分配

本文通过对2000年和2003年部分世界优秀选手200米混合泳的调查分析,计算出优秀选手200米混合泳的周期参数与动作频率参数,为教练员运用这些参数提供一些参考。