1) First Order Generalized Difference Scheme
一阶广义差分法
2) generalized difference method
广义差分法
1.
In this paper, a proposed upstream generalized difference method was adopted to solve the problem about hydro-dynamic dispersion.
通过对具有一定浓度的污染物在地下水运移作用下的污染扩散模型 ,采用广义差分法进行了数值模拟研究 ,并和传统的Galerkin有限元方法进行比较 ,说明该方法处理此类有明显对流项问题的潜力 ,最后给出了算
2.
Then a new difference scheme is given for the discretization of diffusion equations according to the finite volume method,and the scheme is also taken as the solve of using generalized difference methods.
利用指数变换消除了二维对流占优扩散方程中源于不对称算子的迎风效应,将对流扩散方程等价转化为守恒型扩散方程,然后通过有限体积法对守恒型扩散方程离散,构造了一种新型的差分格式,而此格式也可理解为利用广义差分法得到,故收敛阶也可以得到证明。
3.
The generalized difference method is a new method of PDE numerical solution.
广义差分法是偏微分方程数值解的一个新方法,为了得到更为直接的先验估计和误差估计,以Poisson方程为数学模型,通过直接证明双线性型a(·,·)的正定性得到了较为简洁的结果。
3) Generalized difference methods
广义差分法
1.
Inthis paper,we express the difference schemes as the form of GDM(generalized difference methods,cf.
将差分方程表为ＧＤＭ（广义差分法）形式，并利用分层基法将它化为等价方程Ｂｖ＝ｃ，使ｃｏｎｄ（Ｂ）＝Ｏ（（Ｉｇｈ￣（－１））￣２）。
2.
In this paper, finite volume element method(FVEM) are proposed and analyzed for nonlinear parabolic problems and nonlinear parabolic problems and a generalized difference methods in L2 H1 and L∞ error estimates .
本论文讨论了非线性抛物方程的初值问题和非线性双曲方程的初值问题的有限体积元方法以及广义差分法的L_2，H~1和L_∞估计。
4) method of first order difference
一阶差分法
1.
Being directed against the strange signals in feed forward AGC in Benxi Iron and Steel Company, this paper applies the method of first order difference to forecast the change of signals, and thenpretreats them.
针对本钢热连轧前馈ＡＧＣ中采样信号出现的奇异项，本文采用一阶差分法来预测信号变化，进而对奇异信号进行预处理。
5) mixed generalized difference method
混合广义差分法
1.
Considering the boundary value problem of the biharmonic equation and letting, then the equation (A) can be transformed to the form:In this paper, we construct the mixed generalized difference method by taking piecewise quadratic trial space and piecewise constant test space.
给出一种解双调和方程的二次混合广义差分法。
6) generalized fractional lower-order covariance spectrum
广义分数低阶协方差谱
补充资料：对称差分(n阶的)
对称差分(n阶的)
symmetric difference of order
对称差分(n阶的)l另11111州tric山ffer曰℃eof份der‘c“MMe邓一，ecK即pa3Hoc几“op，皿Kan」，一元实变函数f在点x上的 表达式 声/n、，.、。，/.n一Zk八 △口ffx，h)=)l:’1(一1)“f lx十二二~一竺二生h 1. 一‘““一””k饥戈k/、‘产“戈一2‘’/‘将h换成Zh，下面的表达式也称为对称差分: 息川(一1)*，‘二+、。一2、)。).假若f(x)在x有n阶导数厂时(x)，那么 △二f(x，h)=./戈n)(x)h”+o(h”). T .fl .J’IyKame皿。撰
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参考词条