中小力量肌群等张力量训练常用负荷重量的推测

在体疗康复和力量训练中常用10RM(Repetition Maximum)。为能更快、更方便地找出10RM所需的重量,以北京体院46名(男24名,女24名)教师和学生为受试者,进行了负重屈肘和直臂外展的等张力量测试。运用逐步回归分析的方法,建立了二元回归方程及扩展方程。为康复训练和力量练习提供了一个简易、快速的确定锻炼强度的方法。     

浅谈疲劳诊断与恢复的中医学方法

本文运用中医学理论,提出了诊断运动性疲劳及其恢复的简易中医学方法。     

Flash制作个人主页

随着Flash的日益普及,Flash在WEB开发上面也有了很大的发展.通过它制作网页越来越受到广大网民的青昧.下面是我在网页制作时的一些心得.主要介绍网页上loading的制作、Flash与asp的结合原理及制作Flash站点时候经常要用到的与Html方面的实用小技巧     

Rate-sensitive numerical analysis of dynamic responses of arched blast doors subjected to blast loading

Current practice in analysis and design of blast doors subjected to blast loading considers only simple boundary conditions and material properties. The boundary conditions and material properties, in fact, have considerable influence on the response of blast doors subjected to blast loading. In this paper, the dynamic responses of a reinforced concrete arched blast door under blast loading were analyzed by the finite element program ABAQUS, combined with a previously developed elasto-viscoplastic rate-sensitive material model. And the effect of the surrounding rock mass and contact effect of the doorframe were also taken into account in the simulation. It is demonstrated that the strain-rate effect has considerable influence on the response of reinforced concrete blast door subjected to blast loading and must be taken into account in the analysis.     

爆破荷载作用下岩石裂纹扩展研究

针对采用爆破施工时确定参数大多是靠工程经验,而没有进行机理分析问题;通过引入有效应力强度因子,从岩石断裂力学和爆生气准静态理论角度分析了岩石裂纹的启裂、止裂判据和扩展规律,为爆破参数的合理设计提供了理论依据。     

疲劳对特困生心身健康影响的 logistic 回归分析

目的:探讨疲劳因素对特困生心身健康的影响,以建立特困生心身健康与疲劳因素关系的数学模型。方法:随机抽取108名非特困生和212名特困生,采用康奈尔医学指数(CMI)测验特困生的心身症状,采取疲劳评定量表(FAI)测验特困生的疲劳因子,用SPSS12.0录入和统计所有数据。结果:特困生心理健康总分、心身健康总分、疲劳总分、疲劳严重程度、疲劳所致心身后果高于非特困生,差异有统计学意义(P<0.05)。结论:特困生比非特困生疲劳程度严重,易出现心身障碍。疲劳因子对男女特困生的心身健康的影响不同。     

BP算法用于油气管道疲劳寿命估值的研究

管道运输油气具有损失少、耗时少等特点,但是管道安全事故也时有发生,对管道寿命的有效预测是解决管道安全问题的重要手段．针对油气管道寿命预测现状,提出了一种基于疲劳寿命影响因素的BP神经网络疲劳寿命估值方法,并建立BP算法模型;分析各特征要素,确定输入层节点数;用收集到的样本数据,训练并测试BP算法的稳定性及精确度．结果表明,精确度达90％以上,从工程应用角度来说可进入实用．     

Numerical Simulation of the Flat Ribbon Wound Explosion Containment Vessels Subjected to Internal Blast Loading

In order to constitute engineering design methods of the flat ribbon wound explosion containment vessels, the dynamic response of such vessels subjected to internal explosion loading is simulated using LS-DYNA3D. Three winding angles, 10°, 15°and 20°, are considered. It is shown that among ribbon vessels investigated, the center displacement of outermost ribbons of the vessel with 10°winding angle is the smallest under the same blast loading. The response of vessels loaded in inner core is local. From the center of the cylindrical shell to the bottom cover, the maximum strain gradually decreases. The ribbons are subjected to tension in the length direction and compression in the width direction. Blasting shock energy concentrates on where is close to center section of blasting. For comparison, numerical simulation of a monobloc thick-walled explosion containment vessel is also investigated. It can be found that the biggest deformation of the flat ribbon wound explosion containment vessels is bigger than that of the monobloc thick-walled explosion containment vessel in the center section of blasting under the same TNT. Numerical results are approximately in agreement with experimental ones. It is proved that the ribbon vessels have the valuable properties of " leak before burst at worst" compared with the monobloc vessels through numerical simulation.     

浅析CFG桩复合地基设计计算

简述CFG桩复合地基的基本概念,分析CFG桩复合地基承载力计算和CFG桩复合地基变形计算,以及单桩竖向承载力特征值的取值要求和褥垫层厚度确定。     

计算机局域网稳定性分析

用传输线理论分析了计算机局域网中同轴电缆传输线分布电和分布电感对网络工作性能的影响，同时还分析了终端负载在RL＝Rρ、终端短路RL＝0、终端开路RL＝∞等不同情况下对网络工作性能的影响，在以上分析的基础上提出了提高计算机局域网稳定性的措施。