| 1. | Alternating direction explicit difference approximation
交替方向显示差分近似法 |
| 2. | A stable finite difference approximation for vibration equation of beams
梁振动方程的一个稳定的有限差分近似 |
| 3. | Backward difference approximation
后向差分近似法 |
| 4. | Uniform second - order pointwise convergence of a hybrid difference approximation for a singularly perturbed robin problem
基于非均匀网格求解非线性对流扩散问题的一种高精度差分格式 |
| 5. | This is helpful for us to construct difference approximation schemes for hj equation with aids of schemes for conservation laws . in this paper we present a class gauss schemes with staggered grids for hj equation , based on gauss schemes with staggered grids for conservation laws
本文，我们将hamilton - jacobi方程变化为双曲守恒律方程，利用求解双曲守恒律方程的交错网格的gauss型差分格式，构造了一类求解hamilton - jacobi方程的交错网格的gauss型差分格式。 |
| 6. | The novel three - dimensional finite - difference approximations of mur ' s absorbing boundary conditions are also presented in frequency - domain . then the ddm based on fdfd is investigated in the applications of three - dimensional electromagnetics problems . and it is used to analyze the leaky wave antenna based on image nonradiative dielectric ( nrd ) guide
最后，阐述了maxwell方程组和划分区域的despres传输条件的频域差分格式建立，在截断边界上构造了三维频域mur条件的差分近似，探讨了基于频域有限差分的区域分解法在三维电磁问题中的应用实现，并将该算法用于分析一种基于nrd波导结构的漏波天线。 |
| 7. | ( 5 ) discuss some mathematical models of the pollutant transport problems in some local river flow fields . by integral transform method , the paper establishes the usual finite difference approximation scheme to solve the numerical solutions and gives examples for the computation of the approximating solutions , moreover , discusses one - dimensional characteristic finite difference method for a convection - diffusion equation under usual conditions
( 5 )针对水域中污染物输移问题的数学模型，通过积分变换法，得到了简化模型在理想化条件下的近似精确解，同时给出数值算例，并且对非理想化条件下模型的特征差分方法进行了讨论。 |
| 8. | It is proposed on the basis of the analysis on newton method and the preconditioned conjugate gradient method ( pcg method ) . numerical derivatives can be evaluated by symbolic differ - entiation ( sd ) , finite difference approximation and automatic differelltiation ( ad ) . ad has significant advantages over other two approaches
自动微分是一种新的能精确而有效地计算导数的方法，它优越于传统的微分方法，例如它比符号微分和差分方法的计算成本低，又比差分方法计算精确，自动微分在近几年发展迅速，应用广泛。 |
