The finite difference scheme for centered differences in space and time is adopted.
采用时间空间中央差分进行数值求解。
This paper used centered difference to simulate the fluid movement in order to avoid lots of calculations in two dimension wave equation.
为避免二维波方程中的大量计算，使用二维波动方程的中心差分近似来模拟流体运动。
The analytical truncation error formulas of a partial differential equation are given for the upstream scheme and the centered difference scheme, respectively.
然后引入参考解的办法， 用来分离更为一般的微分方程求解过程中的截断误差和舍入误差。
People who operate from a base of principle-centered power can make a tremendous positive difference.
以道义性权力为基础而采取行动的人们，能够做出巨大的、积极的影响。
Ordinary finite element and finite difference methods are often used for seepage calculation, while storage centered finite element method is rarely applied to practice.
普通有限元方法和有限差分方法是渗流计算中常用的数值方法，而贮量集中有限元方法则很少被实际应用。
Various borehole and formation conditions were simulated using the fourth order accuracy in space and second order accuracy in time centered finite difference method.
利用空间上具有四阶精度、时间上具有二阶精度的中心差分方法，数值模拟了几种复杂井眼条件下的波场。
This paper presents an optimization of centered finite-difference operator based on the principle of constrained cost function, which can reduce the truncation error to minimum.
作者根据约束性代价函数原理提出了能够使得截断误差最小化的中心差分优化算子。
Chapter 3 is centered around the existence of periodical solutions for non self-adjoint nonlinear second order difference equations by invoking matrix theory and coincide degree theory.
第三章利用矩阵理论与重合度理论，讨论了一类非自共轭非线性二阶差分方程周期解的存在性问题。
Chapter 3 is centered around the existence of periodical solutions for non self-adjoint nonlinear second order difference equations by invoking matrix theory and coincide degree theory.
第三章利用矩阵理论与重合度理论，讨论了一类非自共轭非线性二阶差分方程周期解的存在性问题。
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