质点

Li reduces the surface tension of aluminum luquid obviously, increases the ratio and rate of heterogeneous nucleation, which is the necessary condition of the formation of fine grains. However, a large amount of unmelted Al3Sc, Al3Zr TiAl3 particles dispersively distribute in the luquid metal along the edge of the molten pool, which is the sufficient condition of the formation of fine grains.

Li显著地降低了铝液表面张力，大大提高了异质形核率和形核速率，是细晶层产生的必要条件；而熔池边缘液态金属中弥散均匀分布大量未熔化的Al_3Sc、Al_3Zr和TiAl_3质点，则是细晶层产生的充分条件。

At last, all related problems due to ship type and towing speed influencing the quality of captured images and results were discussed. A ship model with V-shape bottom and protruding keel might cause some disadvantages for PIV measurements. The use of longer laser light ducts extending deeper is a possible solution. A ship model with light yellow paint will cause the unproportionate of light and will cause white background on captured images. It is suggested to re-paint the ship model in black or dark colors to solve this problem. In high-speed test conditions, a ship model's bow waves entrain large amount of air bubbles into water and those bubbles will block the view of camera causing some random black spots in the images. Thus, it is necessary to remove the useless black spot data and repeat the same test condition if statistics requires enough number of images.

本文讨论建立此系统之技术及实验方法，设备的架置方式和配置为一可调性调整之开放式架构，质点施放方法以一自制的施放架於实验前先布置於测试段中，并制定一实验流程规范，再分别针对实验所得滑航型及排水量型船模的流线方向及切流线方向各不同位置及船速之速度进行流场分析；实验结果发现不同船型会造成不同的实验困难：船形上突起之龙骨及V形船底会遮住照明光线，可利用较深之导管调整光页角度改善；而浅色船模表面会造成光线的不均匀，可以更改船模涂装颜色改善；高速实验的气泡会不定点的遮住光线，须先除去无资料区域并使用更多资料组数来改善。

Vector hydrophone can measure energy and particle velocity at a point in space with one sensor and can estimate the bearing of target.

摘要矢量传感器通过测量水中质点的振速信息，仅用单个的矢量传感器就可以进行水下目标的方位估计。

Vector transducer is a kind of transducer which can provide both the information about pressure and particle velocity of sound field.

矢量水听器是一种不仅能够测量声场中的声压信号还能测量其质点振速信号的接收换能器。

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 magnifying effect of velocity along the height of rock wall are also discussed.

还对沿中隔墩高程分布的质点振速的放大效应进行了讨论。

Based on the existed wave mechanics and by means of the study of the motion and effect of particles in the propagation of waves, this article puts forward that mechanics' effect in the propagation of waves is not only comprised of "stress from deformation" but also of another different form of force——"applied force from motion" which is decided by velocity.

核工业二九O研究所，韶关 512026摘要：在原有波动学的基础上，通过对波传播质点的运动和作用进行研究，提出了波传播的力学作用不仅有因形变产生的应力，还存在着另一种由速度决定的不同形式的力——"动作用力"。

It also provides the calculation of 3-D wave particle velocity.

其中还包括波浪水质点三维流场的计算方法。

Therefore, in this thesis, a new set of models about breaking probability and whitecap coverage is set up using this breaking criterion. Under the assumption of linear ocean waves, and in the light of the theoretical framework about the probabilistic distribution of wave characteristics (Sun Fu 1988), several probabilistic distributions of wave characteristics that is necessary for the estimation of breaking probability and whitecap coverage are derived.

在线性海浪假设下，基于孙孚（1988）关于三维海浪要素统计分布的理论框架，具体给出二维海浪波峰处质点水平速度和表观相速的联合分布等分布函数，在此基础上，根据运动学判据，分别建立起风浪破碎率和白浪覆盖率的理论模式。

In order to study the thermal evolution of the Barbados accretionary complex,spatial coordinate and material coordinate are combined to handle the problem ofadvective heat transfer produced by tectonic movements.

为研究巴巴多斯增生复合体构造热演化的过程，采用空间坐标系和质点坐标系相结合的方法，在处理构造运动和变形的平流热效应时，并用变网格法及固定网格中的迎风法，成功地对该区域进行了二维有限单元法热模拟。

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。