质点运动

Week 2 Solution of basic question on the particle motion.

第2周 质点运动基本问题的求解。

40In this chapter we develop the implications of momentum conservation in the motion of a collection of particles.

本章将揭示群质点运动时动量守恒的含义。

Ship motion has go through two–dimension to three-dimension in theory .

在理论上，船舶运动方程也经历了从质点运动到二维再到三维的变化。

P-wave: An elastic body wave in which particle motion is in the direction of propagation.

P-波：质点运动方向与波传播方向相同的弹性体波。

Discretization is a new method in this paper.

本次研究的主要方法是离散化和质点运动等，这也是本文的一个新方法，通过比较相关的资料，可以发现，这种方法是合适的，也是可行的。

Two different hypotheses on the quantization of particle motion in the flat space by curved coordinate systems are discussed, and their differences in physical ideas and practical operations are compared.

徐湛讨论了平直空间曲线坐标系中质点运动的两种不同的量子化假设，比较了它们在物理思想和实际操作上的区别和优劣。

It is proved that arc coordinates of a directed curve cannot be used as ordinary coordinates or generalized coordinate s for the motion of an Appell-Hamel particle without a fixed orbit, but they can be used as quasi coordinates.

证明了弧长坐标 s在轨道未知的 Appell- Ham el质点运动中不能作为普通坐标或广义坐标，但可以作为准坐标，指出文献 [1]中引入弧长 s坐标的做法及"Appell- Ham el质点运动的轨迹是一般螺线"的结论是正确的，但其Appell- Ham el约束是完整约束及在该质点运动中 s坐标是广义坐标的观点是错误的。

Therefore, based on the velocity composition law of particle movemen t, a mathematical model and its algorithm for the locating error are firstly est ablished to analyze the linear dimension.

为此， 基于质点运动的速度合成原理，首先建立了线性尺寸的定位误差通用模型及其算法。

The outside sea wave streams into near the shore and shallow water area, being subjected to a submarine friction function, the wave 锋 becomes abrupt, the trough of wave become slowly, the fluid matter orders sport track to present back and forth fluxion, and to shore enter the current velocity degree is usually bigger than offshore reflux speed, causing bottom sediment clean to shore porterage, and is aroused a shore wave of ascend the blunt water current take to the seashore on-line pile up.

外海波浪传入近岸浅水区，受到海底的摩擦作用，波锋变陡、波谷变缓，水质点运动轨迹呈现往复流动，而且向岸进流速度通常大于离岸回流速度，导致底部泥沙净向岸搬运，并被激岸浪的上冲水流带至海滨线上堆积。

We investigate this data and derive the following rules to process tunnel refection seismic data: Based on their different particle trajectories and propagation speeds and shear waves need to be separated from tunnel waves, air waves, and background noise.

通过研究这些数据，得出如下一些处理隧道反射地震数据的规则：根据不同的质点运动轨迹和传播速度把压缩波和剪切波与隧道波、空气波和背景噪音分离开来。

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。