在此基础上，提出了基于距离像熵和距离像对比度的速度估计算法，详细分析了这两种算法的数学原理、步骤、效果、适用条件等。

Then, range profile entropy and contrast algorithm are presented for velocity estimation. Following, the math principle, procedure, effect and appropriate con - dition are analyzed in detail.

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在经典气动力学中讨论了非等熵流和非等熵波的存在和产生的条件。

The existence and producing conditions of non-isoentropy flow and non-isoentropy wave have been argumented in classical gas dynamics.

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So we immediately get du at constant S and V is less than zero.

这样我们马上就得到以下结论：,在等熵，等容条件下dU必须小于零。

麻省理工公开课 - 热力学与动力学课程节选