双通道计时法测量刚体转动惯量实验误差分析

本文指出,双通道计时法测量刚体转动惯量的误差比单通道测量误差小;此时,外力矩中不考虑加速度α时引入的测量偏差更是不能忽略,要对测量值进行修正．     

High-Velocity Laminar and Turbulent Flow in Porous Media

We model high-velocity flow in porous media with the multiple scale homogenization technique and basic fluid mechanics. Momentum and mechanical energy theorems are derived. In idealized porous media inviscid irrotational flow in the pores and wall boundary layers give a pressure loss with a power of 3/2 in average velocity. This model has support from flow in simple model media. In complex media the flow separates from the solid surface. Pressure loss effects of flow separation, wall and free shear layers, pressure drag, flow tube velocity and developing flow are discussed by using phenomenological arguments. We propose that the square pressure loss in the laminar Forchheimer equation is caused by development of strong localized dissipation zones around flow separation, that is, in the viscous boundary layer in triple decks. For turbulent flow, the resulting pressure loss due to average dissipation is a power 2 term in velocity.     

193T1超形变带K=1/2的可能性

分析了脱耦合项对于原子核转动惯量的重要影响.总结了奇质量核K=1/2带转动惯量变化规律的新特点.在此基础上讨论了¹⁹³T1中3条新的超形变带的内部结构.目前尚无足够证据能够确认它们都是K=1/2带.     

Buckling of a sandwich symmetrical circular plate with varying mechanical properties of the core

This paper is devoted to analytical and numerical studies of global buckling of a sandwich circular plate. The mechanical properties of the plate core vary along its thickness, remaining constant in the facings. The middle surface of the plate is its symmetrical plane. The mathematical model of the plate is presented. The field of displacements is formulated using the proposed nonlinear hypothesis that generalizes the classical hypotheses. The equations of equilibrium are formulated based on the principle of stationary total potential energy. The proposed mathematical model of the displacements considers the shear effect. The numerical model of the plate is also formulated with a view to verify the analytical one. Numerical calculations are carried out for the chosen family of plates. The values of the critical load obtained by the analytical and numerical methods are compared. The effects of the material properties of the core and the change of the plate radius on the critical load intensity are presented.     

均质旋转面绕旋转轴转动的转动惯量

根据转动惯量的定义推得任意形状均质旋转面对旋转轴的转动惯量的计算公式,文中讨论了鼓形面、花瓶形面、圆台面、圆锥面、圆柱面等特殊形状均质旋转面对旋转轴的转动惯量.     

计算机在转动惯量实验数据处理中的应用

本文具体介绍了计算机辅助处理转动惯量实验中数据结果的应用,提出了一种方便、快速、准确地验证数据结果的方法。     

刚体转动惯量实验中时间测量的改进方法

对传统的刚体转动实验仪时间的测量方法进行了改进,提高了实验测量的精度,拓展了实验内容．同时也可以作为开放、设计性实验．     

三线摆法测刚体的转动惯量所用近似方法对测量结果的影响

讨论了在推导转动惯量的测量公式时采用的近似方法对测量结果带来的影响,指出了减小其影响的途径.     

陀螺惯性制导及其军事应用

简要介绍机械惯性陀螺、环形激光陀螺、光纤陀螺、半球谐振陀螺、石英音叉陀螺的基本工作原理及其军事应用,并预测了陀螺惯性制导的发展趋势。