质点

Firstly, it will consummate MDF fiber separation theory by using for reference of research progeny of paper making field and primarily set up math model of fiber particle's movement in refining plate and draw its movement tracks. At the same time, we use this theory to analysis and contrast four different dentations' refining plates and to validate rationality of this theory and to find the short of these refining plates.

首先，通过借鉴纸浆制备领域在此方面的研究成果，完善了MDF纤维分离理论，初步建立了纤维质点在磨盘间运动的数学模型，并做出其运动轨迹；同时，运用此理论对四种不同齿型的磨片进行了分析、对比，验证此理论的合理性并找出这四种磨片齿型的不足之处。

Work is also done by compressing a gas, by rotating a shaft, and by causing invisible motions of particles within a body by an external magnetic force.

对物体做的功，不仅由整个物体的移动来实现，还可以通过压缩气体、转动轮轴、甚至物体内部质点在外部磁力作用下的微小运动来实现。

Work is also done by compress ing a gas, by rotating a shaft, and by causing invisible motions of particles within a body by an external magnetic force.

对物体做的功，不仅由整个物体的移动来实现，还可以通过压缩气体、转动轮轴、甚至物体内部质点在外部磁力作用下的微小运动来实现。

double pendulum ; gravity free system ; rigid rod ; energy level set ; KAM theory

图 1 双摆模型其中 Pg 中的 g表示系统处于重力场，细杆 OA的质量和长度分别为 m1，l1，细杆 AB的质量和长度分别为 m2 、l2 ，质点 A和 B的质量分别为 m A，m B，系统Pg 绕固定点 O作平面运动

The dynamic behaviour of copper was investgated making use of an ex-perimental Lagrangian analysis technique,in which multiple manganin gauges were used to measure the stress-time history at different Lagrangian positions in the stress wave field,and a modified pathline method was used to analyse and solve the dynamic and physical parameters of the flow field.

利用拉氏分析方法对钨合金在高应变率下的力学性质进行探讨，分析各拉氏位置的应变，比容，密度，应变率，比内能，质点速度等物理量的变化历史，讨论不同晶粒度尺寸对钨合金在高应变率下动态力学性能的影响，给出钨合金在应变率为104~105s-1时的应力应变曲线。

The concept of distribution of the distance between particles which are randomly distributed in n-dimensional space is presented.

许多文献在概率论及其应用中研究了各种分布及其在理论实践方面的重要应用[1-5]，但是关于质点之间距离分布没有考察。

The results of computation show that this method is very effective for reducing and controlling the transverse oscillation of wave motion and for the calculation of wave particle velocity of wave motion on free surface, w...

计算表明：这种0—1混合型边界元的剖分方式，在控制和减缓波浪&横向振动&幅度及水面单元水质点波动速度的计算方面，显示出了其独到的优越和灵活之处，为时域内的波浪非线性变形计算提供了时步上的数值保证

The Doppler effect of moving scatterers causes the radar signals to appear as stochastic processes. Some useful knowledge about the clouds and precipitations can be obtained by analysing the statistical characteristics of these processes.

运动质点的多普勒效应使它们散射的雷达信号呈现为一种随机过程，对这随机过程的统计特性进行分析就能够推断云和降水的微物理或运动学的状况。

When pulled to one side of its equilibrium position and released, the pendulum bob vibrates about this position.

把此质点作为摆锤拉到平衡位置的一侧，然后释放，摆锤就在平衡位置附近摆动。

The influences of Cu-particle addition in Sn-9Zn lead-free solder powderon the interfacial reaction of Sn-9Zn/Cu joint were investigated under extended reflowing time conditions.

研究了长时间再流焊条件下，在粉状Sn-9Zn无铅钎料中加入Cu颗粒增强质点对Sn-9Zn/Cu钎焊接头界面反应的影响。

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。