差分法

Using the mathematical tool"DifferenceGeometry",it is possible to define the discrete geometric metrics such as discretefirst fundamental form,discrete second fundamental form,discrete unit mainnormal vector,discrete Gauss curvature,discrete mean curvature and discreteLaplacian.

首先，运用"差分几何"这一工具，可以构造离散第一、第二基本形式，离散单位主法向，离散高斯曲率，离散中曲率等离散几何量和离散Laplace算子。

As examples,the oil temperature change and solidifying process were calculated by this method,and satisfactory results have been obtained.

采用保角变换和盒式积分法对数学模型进行了处理，并构造出问题的差分方程。

The principle of a differential optical absorption spectrometer is presented in this paper.

本文介绍了差分光学吸收光谱法测量大气污染气体浓度的基本原理。

Finite element method is used in fine mesh subinterval, while upwind difference method is used in coarse mesh subinterval.

在细网格区域采用有限元法，在粗网格区域采用迎风差分格式。

However, in 1997, Biham and Shamir announced a novel attack called Differential Fault Analysis.

直到1997年Biham与Shamir提出了错误差分攻击法(Differential Fault Anaylsis，DFA) [2-3]，证明在假设的错误情况发生之下，只需要少数的明文与错误密文对，便可以破解DES密码器。

Finite-difference beam propagation method is used to calculate and analyze the influence of different structural parameters on birefringence of holey fiber.

采用有限差分波束传播法计算分析了不同结构参数对多孔光纤双折射的影响，结果表明，调控这些结构参数能在特定的波长窗口获得稳定的拍长，且拍长值也可以根据实际需求设计调整。

Eight ERS1/2-SAR images recorded in the last ten years are used for determining the land-surface deformation in the Jungli Industry Park area by differential interferometric method.

本研究选用八幅ERS1/2人造卫星所撷取的合成孔径雷达影像，以差分干涉法进行测量，成功获得中坜工业区过去十年内地表变形情形。

A stable, water-insoluable film was prepared by oxidative electropolymerization of pyrogallol in pH7.0 phosphate buffer solution, anti modified on a glassy carbon electrode surface by electrochemical method. The modified electrode was exploited for the selective preconcentration of Cu at a certain potential. The preconcentrated Cu was firstly reduced at a certain potential and then was determined by differential pulse stripping voltammetry.

采用电化学方法在pH7.0磷酸缓冲溶液中，将邻苯三酚氧化电聚合制成稳定的水不溶性膜修饰在玻碳电极表面，将制得的膜修饰电极在一定电位下选择性预富集铜，并用差分脉冲溶出伏安法测定。

The velocity-stress pseudospectral method, an efficiently numerical modeling method, is easy to implement, with a high computation efficiency and can overcome numerical diffusion of the frequency efficiently.

模拟结果表明，伪谱法是一种有效的地震波数值模拟方法：易于实现，计算速度快、计算效率高，其计算速度是有限差分方法的数倍，能有效克服数值频散。

The method of simulating the problem of two-dimensional pressure seepage with the method of finite difference,disposing the anomalous boundary by mapping point method and protracting the current net was carried out.

对于二维有压渗流问题，采用有限差分方法进行数值模拟，用映象点法处理非规则边界，并绘出流网，与电模拟试验进行对比，验证了这种方法的可行性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。