层状压电压磁弹性材料的空间轴对称问题：在柱坐标下，建立了横观各向同性压电压磁弹性材料空间轴对称问题的状态变量方程。

Axisymmetric problem: The state vector equation of transversely isotropic axisymmetric space magneto-electro-elastic media is established in a cylindrical coordinate system.

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力和力矩方程中的空气动力项已经全部用为其函数的状态变量及操纵力和力矩所代替。

The aerodynamic terms in the force and moment equations have all been replaced by the state variables of which they are functions. and control forces and moments.

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首先，利用奇异摄动理论对再入飞行器状态变量进行两个时间尺度的划分，将系统状态方程分解成两个低维子系统。

Firstly, the state variables of the reentry vehicle are decomposed into two sub-systems of different time scales using the singular perturbation theory.

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And the useful outcome of all that is that p we get to see how entropy changes with one of those variables in terms of only V, T, and p, which come out of some equation of state.

这样做的重要结果是,我们得到了熵随着V，T或者,其中一个变量变化的情况，这些可以从状态方程得到。

麻省理工公开课 - 热力学与动力学课程节选