Time dependent calculation for a suddenly imposed pressure gradient has shown that variation of the cross sectional area reduces inertial effect in the contraction flow region.
压力差为阶跃变化的情况下数值计算结果说明了收缩部的断面积的时间变化减少了收缩部的惯性效果。
The method can overcome disturbances and decrease the length of the pulse packet that must be given to the DFT algorithm which reduces the calculation time.
它克服了运动过程中所带进的干扰、减少了必须用于DFT算法计算所需的脉搏包络的数据长度和DFT所需的时间。
For three-dimensional reconstruction, this essay gives new reconstruction method for points and lines. Especially the overall reconstruction method for lines reduces much calculation and time.
在三维重建时，本文提出了新的点重建方法和直线的整体重建方法，其中直线的整体重建方法大大地减少了直线重建的计算量和计算时间。
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