粒子运动

We can compute three dimensionalvelocity distribution on a planar domain of flow field based on conventional ParticleImage Velocimetryand 3D reconstruction theory of stereophotogrammetry.

在流场空间两个不完全交叠的体积元(映射为两个摄影机象平面上以同名点为中心的两个相同大小的判读小区域)中的示踪粒子的统计性质都能同样表征这两个体积元公共中心的流体运动的假设下，PIV技术与体视三维重建理论的结合，可以将原PIV技术中二维统计平均的概念扩展为三维统计平均，并且在确定体积元公共中心位置之后，直接实现空间流体体元的三维位移重建。

The more massive a particle, the more difficult it is to change its motion.

粒子的质量越重，使得它改变自己原来的运动状态就越难。

In a same cloud band, the variation of temperature is small meanwhile the temperature is lower.The convective bubbles were observed in the warm clouds under the middle of the cumulostratus on 21,June 1992. The bubbles clearly show that they are one kind of mesoscale organization. It suggests that the synoptic system is situable to produce convective bubbles. Its contrastly analysed that the particle concentration and the liquid water content are higher.the particle spectra is similar,the particles captured by 2D-C probe are bigger in the bubbles.

1991年6月21日个例观测到对流泡位于层积云下部暖云中的部分，泡状结构明显，呈现出中尺度组织特征，天气系统的配置有利于垂直上升运动的发展：通过对比分析，发现对流泡内具有云滴浓度高、液态水含量较高、云谱型相似以及2D-C粒子尺度大等特点：本次个例观测到的对流泡内云滴谱表现为单峰型。

External magnetic fields were introduced to arc in liquid for the first time, in order to control the arc shape and the directionality of carbon particles. The primary control of carbon nano-products was realized, and some novel carbon nano-structures were obtained, such as single-walled twist structures and cylinder-shaped structures.

首次引入外加磁场来控制液体中电弧形态和碳粒子的运动方向，实现了对产物中碳纳米结构的初步控制，并得到了一些新颖的碳纳米结构，如单壁管缠绕结构和空心筒状结构。

On the other hand, the external ACMF increased the quantity and directionality of carbon particles, so the quantity and crystallization degree of MWCNTs in cathode depositions. When ACMF and catalyst were adopted at the same time, new cylinder-shaped structures were found in the cathode depositions.

对液体中电弧施加纵向恒定磁场，可以使向阴极表面运动的碳粒子数量增多、定向性增强，从而大大提高阴极沉积物中多壁碳纳米管的数量和晶化程度。

Complementary chaos and spin polarization stability in cyclotrons are studied from the nonautonomous SU(2) dynamical system by the algebraic dynamical method.

带自旋离子在加速器中沿回路运行，相对于磁极运动的粒子会感受到一个磁极产生的随时间变化的磁场。

The rapid motion of the electros causes the sluggish nuclei to "see" the electron as a charge cloud, rather than as a discrete particle.

电子的快速运动使得缓动的核把电子&看成&象电核云，而不是象分立的粒子。

They make particles move according to different types of forces that imitate nature, such as gravity, wind, drag, or coagulation.

他们能够驱使粒子按照各种力场的动力学描述进行运动，从而模拟真实世界中各种力学现象。例如重力风力拖拽力或者凝聚力。

All these prevent the electrons and holes from continuing their steady motion as quasi-free particles, and introduce scattering

所有这些影响都会妨碍电子和空穴去继续它们作为准自由粒子的稳定运动，而引起散射。

All the se prevent the electrons and holes from continuing the ir steady motion as quasi-free particles, and introduce scattering

所有这些影响都会妨碍电子和空穴去继续它们作为准自由粒子的稳定运动，而引起散射。

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。