One-dimensional general model of land subsidence due to pumping is deduced and a semi-analytical method is used to solve this deviatoric differentialequation.
推导了以垂向有效应力为基本变量的一维地面沉降的普遍模型，并用半解析方法予以求解。
2
Two sets of algebraically explicit analytical solution are derived for the partial differentialequation set describing the onedimensional unsteady gas-liquid two phase flow.
对气液两相非定常一元流动方程组导出了两套代数显式解析解。
3
The research on multi-dimensional conservation laws is one of the most challenging direction in the field of nonlinear partial differentialequation, it is very important and very difficult.