微分方程

Axisymmetric elasticity problem of cubic quasicrystal is reduced to a solution of a partial differential equation with higher-order by introducing displacement function.

本文通过引入位移函数使得立方准晶的轴对称弹问题化为求解一高阶偏微分方程。

The condensability of liquid,the Westphal's effect and the continuous flow condition are not only comprehensively considered,but also the dynamic property of the ball valve being established.

结合现场试验,根据直线电机采油泵运动,合虑的可压缩、魏氏效应、连续流动条件和球阀的动力,建立直线电机采油泵球阀运动规律的精确运动微分方程组。