difference operator

Optimum difference operator applied to p - SV wave forward simulation

最佳差分算子在P-SV波正演模拟中的应用

This paper proposes a new approach based on difference operator and region-growing to automatically recognize cell image .

为了实现血细胞图像的自动识别，提出了一种基于差分算子和区域增长的方法。

On the optimum algorithm of difference operator methods for solving ordinary differential equations

算子与微分方程关于解常微分方程的差分算子法的最优算法

A New Method of Finding Amplification Factor by Fourier Transform of a Difference Operator

一种用差分算子变换求过渡矩阵的新方法

Difference operator methods for solving ordinary differential equations

解常微分方程的差分算子法

Clearly , the difference operator or sum operator is the convenient tool for the polynomial of factorial powers .

显然，差分算子及其逆算子是阶乘幂多项式的方便工具。

The first mechanism depends on the information of the image structure , to determine the direction of stepping move through the eight neighborhood difference operator .

扩散中心的步进移动依赖于图像的结构信息，通过八邻域差分算子来确定步进移动的方向。

Principle of wave field extrapolation to Shift 、 Phase shift plus interpolation 、 Split-step Fourier and Fourier finite difference operator are one by one introduced .

本文分别对相移、相移加插值、隐式域有限差分、裂步傅里叶和傅里叶有限差分法的波场延拓原理一一做了介绍。

Fourier finite difference operator can be adopted to ensure good fidelity of seismic wave field in wave field continuation of complicated geology structure , bringing high quality image .

利用傅里叶有限差分算子可保证在复杂构造的波场延拓中，地震波场不失真，成像质量高。

The classic methods of image edge detection includes difference operator , Roberts operator Sobel operator Prewitt operator Robinson operator and Laplace operator .

经典的图像边缘检测方法包括：差分边缘检测、Roberts算子、Sobel算子、Prewitt算子、Robinson算子和Laplace算子，并通过理论分析和仿真计算，比较了它们各自的优缺点及适用性。

Replacing the central difference operator with finite first order difference operator ( Crank-Nicolson ), we can get 45 ° one-way wave equation in unconditionally stable difference scheme .

本文在该方程中进一步引入了Crank-Nicolson一阶有限差分算子来代替中心差分算子，从而得出了45°无条件稳定差分格式的单行波方程。

In comparison with the differential operator and its inverse - integral operator , the difference operator and its inverse ( sum operator ) are discussed in this paper .

与微分算子及其逆算子积分算子作比较，讨论了差分算子及其逆算子（和分）。

Based on the skew direction difference operator , the implicit skew difference schemes were constructed , and the boundary condition was unified , to solve the diffusion equation .

采用斜向差分算子，建立斜向隐式差分格式，再结合边界条件，对扩散方程进行求解。

A self-defined difference operator is then proposed to extract the image edge , by the sum of a pixel and its eight adjacent pixels with different weights .

这里，提出了自定义差分算子来提取道路图像边缘，利用每个像素的八个相邻点，用不同的权值进行求和运算。

Through defining translation operator and difference operator and using method of Lax pair , the correct form of the system of KP difference / ? differential equations has been found out .

通过定义平移算子和差分算子，并利用Lax配对的方法，找到了KP差分-微分方程组的正确形式。

A new prestack depth migration method that is based on wave field continuation has been developed by combining physical model of plane wave synthesizing with Fourier finite difference operator for wave field continuation .

本文将平面波合成的物理模型与傅里叶有限差分波场延拓算子相结合，提出了一种新的基于波场延拓的叠前深度偏移方法。

From the fundamental theory of the teleportation , an arbitrary two-partite state can be teleported via a quantum channel of common eigenstates of number sum operator and phase difference operator .

本文从基本的隐形传态理论出发，用粒子数和算符以及相位差算符，并通过这两类算符的共同本征态作量子通道实现了任意两粒子态的隐形传态。

Based on the quasi-P wave equations in VTI media , a high-order finite-difference scheme was derived by using an even-order accurate difference operator , the stability conditions and the absorbing boundary conditions were also provided .

首先从VTI介质中准P波方程出发，采用任意偶数阶精度有限差分算子构造了准P波方程数值求解的高阶有限差分格式，给出了其稳定性条件和边界条件的计算方法。

Velocity computation using optimum difference operator to simulate P-SV waves is at least one order of magnitude faster than using conventional finite difference schemes and 3 to 5 times as fast as the pseudospectral method which is currently accepted to be the fastest one .

用最佳差分算子模拟P-SV波的计算速度比用传统差分格式至少快一个数量级，比目前公认的速度较快的伪谱法还要快3&5倍。

The method , based on the optimized difference operator for spacial differential ( Holberg , 1987 ), adopts the staggered grid scheme similar to that of Virieux ( 1986 ), and calculates the wave field which differs at different grid points .

该方法建立在空间微分的最佳差分算子（Holberg，1987）的基础上，采用类似于Virieux（1986）所用的那种交错网络技术，在不同网格点上计算不同的波场量。

Solving for the root of difference deconvolution operator by single valued iteration method

用一点迭代法求差分反褶积算子的根

One-way wave equation in time-space domain in inhomogeneous medium-can be deduced by introducing a generalized difference delay operator .

在研究波动方程偏移的技术中，通过引入广义差分延迟算子的概念可得到时空域中完全非均匀介质的单行波方程。

Basing on the Concept of mapping and employing partial difference quotient operator δ _a , difference scheme of determined solution problems for conductor system is obtained with discretization space-times as frame .

以映射概念为基础，离散时空为框架，应用δα偏差商算符得到导体系定解问题的差分格式。

This paper recommends single valued iteration method for solving the root . Used in solving for the root of difference deconvolution operator , this method can not only speed up computing but also guarantee the accuracy of finite difference migration .

本文介绍一种一点迭代求根法，用这种方法计算差分反褶积算子的根，不仅提高了计算速度，而且还能保证波动方程有限差分偏移的精度。

Many nonlinear problems can be studied by converting them to corresponding differential equation , integral equation , integral-differential equation , difference equation , operator equation and other type of equation .

许多非线性问题可以通过转化为相应的方程获得研究，例如可以转化为：微分方程、积分方程、积分-微分方程、差分方程及算子方程等其它类型的各种方程。

The fractional difference equation of random fractal series is induced by substituting difference operator for differential operator , and the fractional differenced whiten-ing filter , through which random fractal signal is converted to white noise , is analyzed and constructed .

接着采用差分算子替代微分算子，导出随机分形序列的分数差分方程，构造和分析了使随机分形信号通过后变为白噪声的分数差分白化滤波器。

In view of explicit difference scheme can only use small step , implicit difference scheme and additive operator splitting ( AOS ) algorithm are adopted .

针对显式差分格式只能采用小步长的问题，改为隐式差分格式，并采用加性算子分裂（AOS）算法求解。

Consider the second order nonlinear variable delays difference equation with nonlinear neutral terms . The sufficient conditions for oscillation of the equation and the difference operator are obtained .

考虑具有非线性中立项的二阶非线性变时滞差分方程，获得了该方程及其差分算子振动的充分条件。

The factional step difference scheme is given for the initial boundary problem of a class of nonlinear reaction-diffusion equation and systems . Using the factor of high order difference operator and the theory and technique of prior estimates , suboptimal order error estimates in l2 is obtain .

对一类反应扩散方程及方程组的初边值问题提出分数步长差分格式.利用高阶差分算子的分解，以及先验估计的理论和技巧，得到次优阶l2误差估计。