查询词典 implicit difference scheme

In the color quantization phase, two schemes have been adopted,one is general palette quantization alogrithm,other is color difference-based quantization algorithm.Which scheme should be choosen depends on the size of image and the users' demands for time and qualities.

在颜色量化阶段，系统采用了两个方案：全局调色板量化方案和基于色差最小量化方案，用户可根据图像的大小和对速度及质量的需求进行选择。

First of all,we construct a semidiscrete finite difference scheme to Burgers equation with initial condition and Dirichret boundary conditions.

首先，对Burgers方程的初边值问题建立了一个半离散的有限差分格式。

The main research contents and results are given as follows:(1) Principles and characteristics of different types of polarization controllers are analyzed, the compare of the difference of these polarization controllers are discussed based on them, drawn a conclusion that the polarization controller which based on squeezing fiber and has variable delay quantity are suitable for high speed optical communication system.(2) The reset principle of the typical four channel polarization controller which is based on squeezing fiber is analyzed, and the design of its concrete reset scheme is given based on them. The reset process and the corresponding operation list are given in detail.(3) The systematical experiment is made when the typical four channel polarization controller is put into the PMD compensator. The experiment result showed that the channel which needs reset can efficiently return to the mean place, and the effect of reset was good, it didn't cause any badness infection on PMD compensation.(4) A new type optical signal time-domain depolarizer is given, and a new PMD compensate method is given based on it.

由此得出延迟量可变型光纤挤压型偏振控制器适用于高速光通信系统的结论；(2)具体分析了典型的四通道光纤挤压型偏振控制器的复位原理，并在此基础上对其进行了具体复位方案的设计，给出了各种情况下的详细复位流程和相应的复位操作列表；(3)将四通道光纤挤压型偏振控制器应用于偏振模色散补偿器中进行系统实验，实验结果表明，需要复位的通道能有效地回到中间值，复位效果良好，且复位未对PMD补偿产生不良影响；(4)设计了一种新型的光信号时域退偏器，并基于该退偏器提出了一种新型的偏振模色散补偿方法。

The Fourier method and heuristic stability theory for the analysis of the computational stability criterion of the difference scheme of linear partial differential equation are also briefly introduced.

对分析线性偏微分方程差分格式计算稳定性判据的Fourier方法、启发性稳定性分析方法，也做了简要的介绍。

In Chapter 2, starting from the basic fractional ordinary differential equations,weapply a high order approximation of fractional derivative advanced by Lubich to frac-tional differential equation, construct a high numerical difference scheme to solve thefractional differential equation, present error analysis of the algorithms theoretically,and prove the consistency ,convergency and stability.

接下来的第二章中，首先从基本的分数阶常微分方程出发，对Lubich提出的一个关于分数阶导数的高阶近似，将其应用于分数阶微分方程，构造高阶数值差分格式来进行分数阶微分方程的数值求解，并在理论上给出这一算法的误差分析，证明了它的相容性，收敛性和稳定性。

Based on reliability analysis of frame structure, in this paper, the relative difference quotient methods is used for optimization of the frame structure, and a iteration scheme to find the optimum solution is presented.

以框架结构系统的可靠性分析为基础，给出离散变量框架结构可靠性优化的相对差商方法及迭代格式，并用算例证明了该法的有效性及实用性。

The compact difference scheme for two dimensional Boussinesq equation is given on a staggered grid.

在交错网格上构造了求解非线性Boussinesq方程的紧致差分格式，此格式可以在只用到三个网格结点的情况下，达到空间四阶精度。

The adaptive program is calculated by T-B stress recovery scheme and z-z error estimation, the error is estimated by energy norm of difference of recovery stress and meshless stress. If the local relative error exceeds the limit relative error, then new nodes will be generated at the high error area.

本研究的自适应方法采用TB应力平滑技术和Z-Z误差估计，利用平滑应力和无网格法所得应力解差值的能量范数来估算误差，如果局部相对误差超过了允许误差，则在高误差域插入新的离散点进行加密。

In Chapter Three we mainly discuss equivalent comparative sentence, put forward a simple scheme of equivalent comparative sentence production, and explore the semantic difference and transformation possibility of the equivalent comparative sentence.

第三章我们主要讨论了等同比较句，提出了一个生成等同比较句的简易方案，并且对各种等同比较句式之间的语义差别以及变换的可能性进行了探讨。

The main scheme is to track every part of human body from top to bottom on the basis of human model. The image-difference-based motion estimation and the divided region histogram similarity algorithm are used.

其基本思想是在建立人体模型的基础上，按自上而下的顺序依次跟踪人体各部分，并在其中采用了基于图像差分的运动预测和分区域直方图相似度算法。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。