质点

In the simulation of the impact of outrunner blocks in debris flow and counter structures, the structure is simplified as a still plane and the block is simulated by a particle with a certain velocity. So the impact force can be expressed by a simple function.

为模拟泥石流大块石对构筑物的冲击，将构筑物假设成静止不动的平面，将大块石简化为以某速度运动的质点，建立基于修正Hertz接触理论的计算模型。

The influence of wave surface boundary layer is very little so it could be ignored in computation.

波浪存在产生的表面和底部的边界层对于潮流的影响，与波浪水质点的运动有直接关系。

First, right coordinate system is chosen to analyse force and torque in the bomb flying course , particle ballistics model of vertical attack face is built ,after that, ballistics plan composed of four phases ,namely slide 、transition、dive and attacking angle backing to zero , is designed which can achieve demands for both cannon-shot and precision.

首先选取合适的坐标系分析了制导炸弹在飞行过程中所受的力和力矩，建立了纵向攻击面的质点弹道模型。在此基础上，按既要满足一定射程又要满足一定精度的技战术要求设计、优化出包含滑翔、过渡、俯冲和攻角回零四段的方案弹道。

A central force is defined as a force acting along the line joining a particle or object to a center of force.

辏力就是沿着质点向力心连接线方向作用的力。

Discusses the dynamic theorem of mass system relative to centre of mass moving in a plane.

论述了质点系相对于随质心一起作平动的座标系的动力学规律。

Composed of particles that do not cohere.

无内聚性的由不能粘着的质点组成。

Composed of particles that do not cohere .

无内聚性的由不能粘著的质点组成。

In this article, we will use this novel finite particle method to analyse several important and interesting dynamics problems in neat/insighting style, including the maximum and minimum period problem of the compound pendulum oscillation, plane impact problem and the spin and precession direction problems of the oblate and prolate satellites.

本文将透过先进的有限质点法，以极简的风格来分析几种重要而有趣的动力问题，包括复摆的最大及最小周期、刚体的角碰撞问题、薄碟型人造卫星公自转反向问题以及细长型人造卫星公自转同向问题。

It also gives themechanical energy of the particle france and the expression of the conservation law of mechanical energy ,and discusses the statement on the consenvation law of mechanical energy in same books.

给出了守恒和守恒定律的定义，并给出了质点组的机械能及机械能守恒定律的表述，还对一些文献关于机械能守恒定律的论述进行了讨

In this chapter we develop the implication's of momentum conservation in the motion of a collection of particles.

在本章中，我们要揭示一个质点集体作运动时动量守恒的含义。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。