In unsteady flows it may be relevant to measure the spatial velocity distribution as a function of time.
非定常流中流速分布及湍流中欧拉空间关联函数都需要同时测量各空间点的速度作为时间的函数。
Combined with the mean radial velocity and distance of the cluster, from the literature, the 3-d spatial velocity of NGC 2244 is also derived.
进一步结合已知的星团距离和视向速度资料，计算了NGC 2244的三维空间运动速度，结果表明NGC 2244是一个典型的薄盘族星团。
Contrast, spatial frequency, presentation time, moving velocity and phase reversal frequency of each grating are controlled independently.
每组光栅的对比度、空间频率、显示时间，移动速度和反相频率能单独控制。
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