质点

"Centrifugal force: Fictitious force, peculiar to circular motion, that is equal but opposite to the centripetal force that keeps a particle on a circular path."

离心力：在圆轨道上运动的质点所特有的惯性力，量值和量纲都和使该质点沿该圆轨道运动的力相同，但方向相反。

Simple harmonic motion is the motion executed by a particle of mass m subject to a force that is proportional to the displacement of the particle but opposite in sign.

简谐振动是指质量为m的质点-该质点承受一种与其位移成正比而方向相反的力作用-的运动。

Firstly, we recall some notions and results about space theory, including Hausdorff space, Hausdorff distance between sets , Baires category about sets and convex set. Secondly, the semi-continuity, closure, compactness of set-valued maps are introduced in set-valued analysis. Finally, essential point, essential set and essential component are introduced.

其中，空间理论及凸集的基本知识介绍了Hausdorff空间、集合间的Hausdorff距离、集合的Baire分类、以及凸集等四个方面；集值分析部分主要介绍单值映射的半连续性以及集值映射的半连续性、闭性和紧性；本质点、本质集和本质连通区部分主要介绍了本质点、本质集和本质连通区等有关概念和性质。

This paper,on the basis of motion kinetics equation,after considering the inertial force,infers the theorem of kinetic energy in non-inertial system .

从质点组相对运动动力学方程出发，考虑每个质点受到的惯性力，推导出非惯性系的动能定理，并在此基础上对机械能守恒进行研究，给出了惯性力为保守力的条件。

In the modified Newtonian mechanics, the law of conservation of momentum and the law of conservation of energy become invalid; instead, the inherent momentum and inherent kinetic energy can be defined to make the law of conservation of inherent momentum and the law of particle inherent kinetic energy valid.

在修改后的牛顿力学中，动量守恒定律和能量守恒定律不再成立，但可以定义固有动量和固有动能，使得质点系固有动量守恒定律和质点固有动能守恒定律成立。

The sample of nonleaded freeutting brass containing silicon is observed with electron microscope, we find that there is a clearance in the boundary between basal part?P phase and second phase particle?

将合硅的无铅易切削黄铜试样置于电子显微镜下观察，发现第二相质点γ相与基体β相的交界处有一间隙，说明基体与第二相质点间并未紧密结合。

Matrices, Vector and Vector Calculus, Newtonian Mechanics-single Particle, Oscillations, Nonlinear Oscillations and Chaos, Gravitation, Some Methods in the Calculus of Variations, Hamilton's Principles Lagrangian and Hamiltonian Dynamics, Central-Force Motion, Dynamics of a System of Particles, Motion in a Noninertia Reference Frame, Dynamics of Rigid Body.

矩阵和向量的计算、单一质点的牛顿力学、线性与非线性的振动运动、重力、微积分上的变分法介绍、哈密顿原理、拉氏及哈氏力学、连心力下的运动、质点系的运动力学、在非惯性坐标中的运动、刚体的运动。

By the Laplace transform method, the decreasing rule of particle displacement of seismic wave has been resolved and so does the rule of phase velocity, particle velocity in time and frequency domain respectively.

通过拉氏变换求得地震波质点位移的衰减变化规律，并进一步得到了相速度、质点速度在时间域和频率域的变化关系。

Results: About 435±17 and 343±9 protein spots were found in the two maps of normal group and Pulsatilla chinensis group, respectively: The match ratio was 92.5% and 94.9% respectively.

结果：正常对照组找到蛋白质点平均(435±17)个，匹配率为92.5%；白头翁组找到蛋白质点平均(343±9)个，匹配率为94.9%。

The rockfall was regarded as a polyhedral, non- particle rigid body, and its motion formula was set up with the revolution motion of rock rigidity.

考虑落石为多边体的非质点刚体，利用刚性的回转运动建立非质点的运动方程式。

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。