构造了求解二维两群中子扩散方程的混合间断有限元格式，研制了相应的计算程序。
A variational formula combining mixed finite element method with discontinuous finite element method is derived for solving the two-group neutron diffusion equation in 2d.
第四章里，对二维非线性对流扩散方程，构造了特征有限元的两重网格算法，并给出了相应的收敛性分析，数值例子。
In chapter 4, for 2d nonlinear convection-dominated diffusion equation, a two-grid scheme of characteristic finite-element solution is constructed.
建立的粉尘在巷道中的传递方程是一个二维平流扩散输运方程。
The transfer equation for dust given in this paper is a equation of two dimensional airflow diffusion transport.
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