谈高运动负荷状态下短跑训练中恢复的效用与影响

随着现代短跑竞技运动水平的不断提高,比赛的激烈对抗和赛事的日益频繁,对运动员连续承受大负荷比赛与训练提出了越来越高的要求,大强度训练已成为当代高水平短跑运动员的重要体能训练特点。训练负荷的安排是以强度作为训练负荷的灵魂,但值得注意的是,训练负荷的增大须在完善恢复措施的保障下进行,恢复是高质量训练的保证也是训练的延续。因此如何科学地把握短跑的训练过程,以实现训练效益的最大化,就必然成为训练研究的重要任务之一。     

血清肌酸激酶的运动训练负荷监控作用研究述评

综述了近年来有关肌酸激酶在运动训练过程中变化情况的研究.肌酸激酶（CK）是运动训练过程中变化比较敏感的指标之一,无论是大强度还是低强度的训练,都会使血清中肌酸激酶的活性产生不同程度的增高.在运动训练实践和运动生理生化研究中,血清肌酸激酶是评定训练负荷最敏感的指标之一,可以用来进行训练负荷的监控.     

中日竞走运动员高原训练期间递增负荷运动实验和运动能力的研究

对中方１０名竞走运动员（世居海拔２２６０ｍ）和日方１０名竞走运动员（居住平原，１０ｍ）在青海多巴高原的训练基地（海拔２３６６ｍ）和平原（海拔１０ｍ）训练期间进行了４ｍｉｎ递增负荷实验的血乳酸，心率的测试。结果表明：高原训练初期与后期相比，中日双方运动员的无氧阈速度ＡＴＶ分别由３．ｏｆ士０．４２ｍ／ｓ、２．７８±０．５２ｍ／ｓ升至３．２２±０．２５ｍ／ｓ、３．３０±０．３４ｍ／ｓ，血乳酸一速度曲线右移程度较大。中日运动员高原训练后期和初期的同级负荷运动心率相比均有所降低。同时从ＡＴＶ与比赛平均速度的相关系数看（男子运动员ｒ=０．８５，Ｐ＜０．０１；女子运动员ｒ=０．６５，Ｐ＜０．０５）它们之间存在较高度的相关。     

青少年速滑运动员有氧耐力训练的心率负荷模式

科学地利用心率变化情况进行有氧耐力训练监测,对于广大基层速度滑冰教练员是简单、实用和可行的训练方法。通过文献资料、逻辑分析等方法,阐述了公式法、生理反应法、呼吸变量法等心率无氧阈测算方法;并对心率无氧阈、心率负荷与训练强度的关系等问题进行了研究;基于心率无氧阈分析,提出了培养青少年速滑运动员有氧耐力的心率负荷带训练模式,心率负荷训练间歇模式,以及不同年龄的青少年速滑运动员有氧耐力训练的心率负荷参考值对应表。     

实验编导课中不同录像带的视频编辑技巧

重点介绍了处理不同格式录像带时，视频编辑的技巧。     

录像观摩在"中学化学教学论"教学中的作用

录像观摩在中学化学教学论教学中是训练学生化学教学技能不可缺少的一环,同时它还可以加深学生对化学教学原理和方法的认识.教师应开动脑筋,想方设法丰富录像资料,并将录像观摩灵活运用于中学化学教学论的课堂教学中.     

Numerical Analysis of Structural Progressive Collapse to Blast Loads

After the progressive collapse of Ronan Point apartment in UK in 1968, intensive research effort had been spent on developing guidelines for design of new or strengthening the existing structures to prevent progressive collapse. However, only very few building design codes provide some rather general guidance, no detailed design requirement is given. Progressive collapse of the Alfred P. Murrah Federal building in Oklahoma City and the World Trade Centre (WTC) sparked again tremendous research interest on progressive collapse of structures. Recently, US Department of Defence (DoD) and US General Service Administration (GSA) issued guidelines for structure progressive collapse analysis. These two guidelines are most commonly used, but their accuracy is not known. This paper presents numerical analysis of progressive collapse of an example frame structure to blast loads. The DoD and GSA procedures are also used to analyse the same example structure. Numerical results are compared and discussed. The accuracy and the applicability of the two design guidelines are evaluated.     

改善电视机行不同步的有效方法

本文从理论上阐述电视机的一些特殊故障产生的原因。在元器件完好而电视机又突然不能收看,但经调整行频电位器后又能收看,其原因是电视机自动频率控制电路失控,而电视机的行同步捕捉范围和行同步保持范围变窄,又往往是自动频率失控的主要原因。扩大行同步的捕捉范围能有效的解决行频不同步问题。实践证明适当加大振荡管发射极电阻或提高振荡线圈的Q值,二者都能提高行同步的捕捉范围,从而解决了自动频率失控的问题,使电视机能正常收看。     

Mechanical Behaviors of Silt Rock Subjected to Coupling Static and Impact Loads

Experiments of silt rock subjected to coupling loads were carried out on tailormade equipment. With a constant dynamic load, the behaviors of eight sets of siltite specimens were investigated with different axial static loads. The experimental results show that the modulus of the specimens under coupling loads increases at first and then decreases with the increase of axial static pressure. The failure model of the specimens also varies. Keeping the dynamic load constant, when the axial static pressure is low, the specimen breaks in two simply. With the increase of axial static pressure, the cone-shaped fragment appeares. When the axial static pressure reaches 90% of the static strength of rock, the specimen smashes into amount of small fragments.     

Numerical Analysis of Structural Progressive Collapse to Blast Loads

After the progressive collapse of Ronan Point apartment in UK in 1968, intensive research effort had been spent on developing guidelines for design of new or strengthening the existing structures to prevent progressive collapse. However, only very few building design codes provide some rather general guidance, no detailed design requirement is given. Progressive collapse of the Alfred P. Murrah Federal building in Oklahoma City and the World Trade Centre （WTC） sparked again tremendous research interest on progressive collapse of structures. Recently, US Department of Defence （DoD） and US General Service Administration （GSA） issued guidelines for structure progressive collapse analysis. These two guidelines are most commonly used, but their accuracy is not known. This paper presents numerical analysis of progressive collapse of an example frame structure to blast loads. The DoD and GSA procedures are also used to analyse the same example structure. Numerical results are compared and discussed. The accuracy and the applicability of the two design guidelines are evaluated.