查询词典 approximation

Based on this result, we give a 0.63-approximation algorithm for bisection 2-Catalog Segmentation problem.

然后利用这个结果给出平分二目录分割问题的0.63-近似算法。

The nonlinear stability of three-dimensional disturbances for the Blasius boundary layers is studied. We adopted here the high accuracy method of using the expansions in orthogonal functions along the normal direction and the effective algebraic mapping to deal with the problem in the infinite region. The initial solutions of two-dimensional harmonic waves are given by Landau expansion, and the mean-flow-distortion is calculated by the approximation equation.

运用Landau展开给出了二维谐波的初始解、通过求解线性PSE而得到TS波和C型亚谐扰动的初始站值、以及近似地模拟初始站的均流变形值，以此为初始条件，并结合迭代-预估校正方法来实现非线性PSE的求解和推进，详细地研究了非平行边界层三维扰动C型失稳过程。

The band gaps of ternary zinc blende BxIn1-xP and BxGa1-xP alloys are calculated using first principles in the generalized gradient approximation,and their bowing parameters are obtained.

利用第一性原理计算方法，用广义梯度近似处理电子之间的交换关联能，计算了BxIn1-xP，BxGa1-xP的带隙结构。

The concepts of weighted α-lower product and weighted α-upper product between a relation matrix and a Boolean column vector are presented in weighted approximation space.

在加权近似空间中提出了关系矩阵和布尔列向量加权α下乘法和加权α上乘法的概念。

Born approximation and convolution principle were applied to the simplified model.

我们使用了Born approximation的条件与折积理论来建立此简化模型。

Moreover, all analysis here is based on the first-order Distorted Wave Born Approximation theoretical model that has been quite successful in engineering application.

并且，这里所有的分析都是根据在工程应用中最成熟的一阶畸变波Born近似理论模型。

As all knows, Born approximation is a bottleneck to geophysical imaging.

在地球物理成像中，波恩近似是一个瓶颈。

In this work, a distorted-wave Born exchange approximation method within fully relativistic frame is presented.

本文给出了在全相对论框架下利用扭曲波波恩交换近似计算细致能级电离截面的方法。

The Born approximation assumes that the incident and the outgoing particle can be described by plane waves.

玻恩近似假定入射粒子和发射粒子都可以用平面波来描述。

These calculation results indicate that the Second-order Born approximation is available on researching the electron-atom scattering in a laser field.

计算结果表明，由二阶玻恩近似方法得出的结果与实验符合比较好，从而说明这种计算方法在研究激光场中电子—原子散射时是准确的。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。