物理原理与工程实践相结合案例浅析

本文结合中国民航大学物理教学实践项目,介绍应用经典力学方法编写符合实际需要的分子动力学模拟程序的基本思路,同时本文给出了具体的模拟结果,该结果与实验监测相符合,达到了预期的目标。本文表明物理基本原理完全可以通过具体的实践项目跳出课堂走入实际应用。     

一种确定系统动力学延迟函数类型的方法

在求得DELAYN中脉冲输入的输出表达式的基础上，作者得出了单位物质在DELAYN中的平均延迟时间和延迟时间方差的解析式、根据该解析式，作者提出了一种确定系统动力学延迟函数类型的方法。     

网络自制剧热播的传播学解读

从2010开始,各大网站纷纷试水网络剧的制作,获得了不错口碑和可观的经济效益。正因如此,使得更多网站加入到该行列中,希望能在这种新产品市场占有一席之地,那么网络自制剧的成功之道为何？从传播学角度来看,传者、受者、传播内容和载体是一个传播过程不可或缺的元素,因此可以从这几方面去探究网络自制剧热播的原因。     

Power laws and athletic performance

In a previous study,we showed that the 1992 men's world record running times in the 100 m to 200 km could be represented accurately by the equation T= cDn, where T is the calculated record time for distance D, and c and n are positive constants. Here, we extend that to cover the years 1925-65 at 10-year intervals and 1970-95 in 5-year intervals for distances of 100 m to 10 km. Values of n for all years lie along a straight line with a small negative slope. A regression analysis yields an equation for values of n covering the period 1925-95. Values of c from 1925 to 1995 were fitted by a quadratic equation. These two equations define a surface in three-dimensional space log(T), log(D), date for all men's world record runs over the 70-year period for distances of 100 m to 10 km. We also demonstrated previously that event times, t, do not scatter randomly with respect to the values of T but form a consistent pattern about the straight lines in log(T) versus log(D) plots. In this study, we show that the pattern of (t-T)/t as a function of date has remained constant for the past 70 years.     

Biomechanical differences in soccer kicking with the preferred and the non-preferred leg

The aims of this study were to examine the release speed of the ball in maximal instep kicking with the preferred and the non-preferred leg and to relate ball speed to biomechanical differences observed during the kicking action. Seven skilled soccer players performed maximal speed place kicks with the preferred and the nonpreferred leg; their movements were filmed at 400 Hz. The inter-segmental kinematics and kinetics were derived. A coefficient of restitution between the foot and the ball was calculated and rate of force development in the hip flexors and the knee extensors was measured using a Kin-Com dynamometer. Higher ball speeds were achieved with the preferred leg as a result of the higher foot speed and coefficient of restitution at the time of impact compared with the non-preferred leg. These higher foot speeds were caused by a greater amount of work on the shank originating from the angular velocity of the thigh. No differences were found in muscle moments or rate of force development. We conclude that the difference in maximal ball speed between the preferred and the non-preferred leg is caused by a better inter-segmental motion pattern and a transfer of velocity from the foot to the ball when kicking with the preferred leg.     

混合式教学中网上学习动力系统的创建与实践研究——以“网上支付与电子银行”网络课程为例

当前,很多学校都开展了网络课程建设,以期通过传统教学和网络教学的结合,提升教学质量,培养学生的自主学习能力。然而,研究结果显示,很多学生在进行网络学习时积极性并不高,无法长时间坚持在线学习。为解决这一问题,提出应建立学生在线学习动力系统,并结合网络课程的实施进行了研究。研究结果表明,创建学习动力系统是提高教学质量,培养学生自主学习的有效方式。     

3-TPT并联机器人的动力学研究

运用凯恩方程对3-TPT并联机器人进行了动力学分析,建立了动力学方程,为进一步机构动态特性分析提供了依据。     

基于系统动力学的建筑碳排放预测研究

以系统动力学模型为基础分析建筑碳排放的影响因素,设置不同仿真情景预测建筑碳排放的未来发展趋势及其内在逻辑关系,进而为降低建筑能源消耗、减少碳排放总量、实现建筑的绿色可持续发展提供理论依据和减排路径。     

FMD系统模型及其计算机仿真

介绍了多柔体系统动力学FMD(FlexibleMultibodyDynamics)的力学模型建立、数值求解和计算机仿真的方法 利用Lagrange方法建立多柔体动力学模型,利用参考文献[10]中的实例进行多柔体假设,将计算机仿真结果进行了比较     

Dirac符号在经典力学中的应用

本把Dirac符号应用于经典力学，给出矢量力学新形式的矢量表述。