该方法直接利用三维图像偏微分计算边缘的曲率，并根据曲率的特性，选取表面的顶点。

The vertices of geometric model on the surface of object was chosen according to the curvatures which was computed directly from partial derivation of volume image.

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同时对转子精确位置信号进行微分计算又可以获得精确的速度信号，故实现精确速度闭环又成为了可能。

At the same time, we can get the speed value of motor by differential computing the position value, so it is possible to accurately control the speed of motor.

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现在，如果你计算时间，会很接近终端速度，这并不简单，因为你们要解一个，令人厌恶的微分方程。

Now, if you want to calculate the time that it takes to get close to terminal speed, that is not an easy task, because you are going to end up with a nasty differential equation.

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This is going to be probably a homework at some point to do this. For now, let's take it for granted. Let's take it for granted that we know how to calculate this derivative from an equation of state like this.

这可能是将来的一个课后作业,现在，请把这当成理所当然的，理所当然地认为我们,知道怎样从一个状态,方程计算这样的微分式。

麻省理工公开课 - 热力学与动力学课程节选

We can measure the heat capacity at constant volume, and now we have another term, and if we can figure out how to measure it, we'll have a complete form for this differential du which will enable us to calculate du for any process.

我们能够测量恒定体积下的热容，这里我们有另一项，如果能够知道怎么测量它，问我们就有了这个完整的微分式,就能够对任何过程计算。

麻省理工公开课 - 热力学与动力学课程节选