这些就是v的定义，也就是瞬时速度。
许多研究表明机动车的尾气排放量与车辆的瞬时速度、加速度密切相关。
Many studies have shown that the amounts of vehicle emissions are typically affected by vehicles' instantaneous speeds and acceleration rates.
但德布罗意曾说过，波长是和瞬时速度相联系的，通过这个公式。
But DE Broglie has told us that the wavelength is related to the instant velocity through this formula.
设计了一套采用光电开关测量高速列车进出隧道瞬时速度的实验装置。
An experimental unit for measuring instantaneous speed of high speed train passing through tunnel with a photoelectrical switch is designed.
从瞬时速度、脉动速度和平均速度分布等方面对湍流流动进行了分析。
Based on the distribution of instant velocity, fluctuating velocity and average velocity, the flow status of turbulent flow is analyzed.
这只是牛顿学上关于动量的表达，用电子质量，乘以瞬时速度。
And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.
实验结果表明，该同步瞬时速度辨识的方法和控制方案具有良好的速度辨识性能和控制效果。
The results show that the control scheme and identification method are of better speed identification performances and control effects.
本文介绍利用双脉冲激光全息术研究柴油机喷雾油束的宏观运动瞬时速度和喷雾粒子的微观运动速度。
This paper presents some experimental results of the instantaneous macro-speed of diesel fuel spray and the micro-speed of droplets in a diesel fuel spray by using double pulse holographic technique.
采用MMA220加速度传感器获取活动时的加速度，通过分段积分的方法获得瞬时速度，再结合加速度进行活动状态判断。
MMA220 was used to catch the signal of acceleration, and the speed of which was obtained by segmental integral, so that the activity state can be deduced.
试验可以得出颗粒三维运动的瞬时速度，初步试验得出颗粒的纵向平均速度遵循对数分布，颗粒速度小于相应水流的运动速度。
The results of preliminary experiments show that the distribution of stream-wise particle velocity follows the log-law, and the particle velocity is lower than the corresponding clean water flow.
介绍了一种发动机无外载功率检测系统的软、硬件设计，利用测频法测量出某一时刻的瞬时速度，并利用最小二乘法求出角加速度。
By the method of frequency measurement, instant rotational speed is measured in the test system, angular acceleration is calculated by using the feature of the MCU with the least square method.
利用IFA300型二维恒温热线风速仪系统对双旋流气体燃烧器模型的冷态流场进行了实验研究，测量了流场内不同位置瞬时速度分布及湍流强度特性。
An experimental study was conducted of the cold-state flow field of a dual swirl gas burner model through the use of an IFA300 type two-dimensional constant-temperature hot-wire anemometer system.
利用IFA300型二维恒温热线风速仪系统对双旋流气体燃烧器模型的冷态流场进行了实验研究，测量了流场内不同位置瞬时速度分布及湍流强度特性。
An experimental study was conducted of the cold-state flow field of a dual swirl gas burner model through the use of an IFA300 type two-dimensional constant-temperature hot-wire anemometer system.
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