查询词典 velocity

In order to solve the problem,starting from the analysis of the simplest plane wave numerical theory,we derived the formula of relative phase velocity and group velocity under the condition of arbitrary high-order finite-difference approximation,and gave the computational method for acquiring the optimum Courant number,and then analyzed the anisotropic effects due to finite difference approximation.

针对此，从最简单的平面波数值理论分析出发，推导了任意高阶有限差分近似条件下相对相速度和相对群速度的计算公式，给出了求解最佳Courant数的计算方法，分析了差分近似造成的各向异性效应。

The simulated results show that the fishtail shape coefficient is high when the feed velocity is relatively low and will be reduced with increase of feed velocity.

结果表明：进给速度相对较小时，环件鱼尾形状系数较大，随着进给速度进一步增大，鱼尾形状系数反而减小。

The paper analyzes the shortage of traditional roadway measuring wind method,and by theoritical calculation of measurement,the wind amount is tested,and the roadway fixed central point method of wind measurement and the roadway s average wind velocity fixed-point method of wind measurement are proposed,and which solve the problem of low wind velocity and low credibility well.

分析传统井巷测风方法的不足，并通过风量测定的理论计算和对现场风量进行实际验证，提出了井巷中心点定点测风法和井巷平均风速点定点测风法，较好地解决了当前测定风速慢、可靠性差的问题。

The interaction between the flow and particle motions and their influence to the minimal fluidization velocity and minimal bubble velocity are analyzed.

分析了流动与颗粒运动的相互作用，及其对最小流化速度和最小气泡速度的影响。

Velocity is a measurement of speed and has nothing to do with mass; however, force is a vector that is applied to the particle to change the particle velocity, and when it is applied, mass is taken into consideration (acceleration = force / mass).

速度是速率的衡量标准，它和物体的质量无关；然而力是施加在粒子上并改变粒子速度的一个矢量，当它施加在粒子上时，质量就成为要考虑的因素

The pangola grass with different length was throwed by the free body falling method and the passing time was measured using two infrared ray sensors. The calculative terminal velocity V was calculated through the time and distance. The exeperimental terminal velocity V of grass with different length was measured by the floating method.

本研究之目的乃是以盘古拉牧草为研究对象，改变不同长度的牧草茎，首先以自由落体法，利用红外线感测器量测出时间，藉由时间与距离之关系，代入公式得到计算终端速度；其次以浮力法，量测出不同长度的牧草茎之实验终端速度。

I introduced in the paper one kind of VVVF elevator control system, I has used the closed loop velocity modulation regarding the elevator velocity modulation system, and has carried on the detailed design separately to the hardware electric circuit main part,including PLC control section,frequency changer,main circuit and gate and so on.

在论文中我介绍了一种VVVF的电梯控制系统，对于电梯的调速系统我采用了闭环调速，并对硬件电路的主要部分分别进行了详细设计，包括PLC控制部分，变频器，主电路和门电路等。

This design paper introduced one kind based on the DSP chip entire numerical control single-phase frequency changer design, along with the frequency conversion velocity modulation technology unceasing development, the frequency changer application is more and more widespread, the frequency changer besides has the remarkable velocity modulation performance, but also has the remarkable energy conservation function, is the enterprise technological transformations and the

本设计论文介绍了一种基于DSP芯片的全数字控制单相变频器的设计，随着变频调速技术的不断发展，变频器的应用越来越广泛，变频器除了具有卓越的调速性能之外，还有显著的节能作用，是企业技术改造和产品更新换代的理想调速装置。

This design paper introduced one kind based on the DSP chip entire numerical control single-phase frequency changer design, along with the frequency conversion velocity modulation technology unceasing development, the frequency changer application is more and more widespread, the frequency changer besides has the remarkable velocity modulation performance, but also has the remarkable energy conservation function, is the enterprise technological transformations and the product renewal ideal speeder.

本设计论文介绍了一种基于DSP芯片的全数字控制单相变频器的设计，随着变频调速技术的不断发展，变频器的应用越来越广泛，变频器除了具有卓越的调速性能之外，还有显著的节能作用，是企业技术改造和产品更新换代的理想调速装置。

This article introduced the elevator velocity modulation is carries on the velocity modulation through the frequency conversion.

本文介绍的电梯的调速是通过变频来进行调速的。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。