在有限电导率光栅的微分理论中引入校正傅里叶展开方法，改善了计算收敛性。
In order to improve the convergence rate, a correct Fourier expand method was introduced to differential theory of the finite conductivity diffraction grating.
本文针对二维自然对流换热的控制方程的数值求解，利用交替方向隐式格式，改善数值方法的收敛性。
The alternative direction illegible method is used in solving two-dimensional convection-diffusion equation for natural convection in cavity, and the convergence is improved.
通过在遗传算法中引入精英保留的进化策略，保证算法的收敛性，改善优化结果。
The elitist strategy was introduced into GA to improve the convergence and optimization results.
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