近似方法

We first present a 0.73-approximation algorithm, which can take the advantage of the special structure of the bipartite graph, for disjoint bisection 2Catalog Segmentation problem.

我们先讨论无交的平分二目录分割问题，利用图的特殊结构设计了巧妙的随机舍入方法得到0.73-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。

Convective-type boundary conditions at interface of vessel walls are used in simulating convective heat transfer in blood vessels.

在血管壁施加第三类边界条件是计算血液与组织间对流换热的一种近似计算方法。

In Chapter 2 of this thesis,we show that the rate of convergence to equilibrium is Ot~(-∞,by using a method developed for the Boltzmann equation without external force in.

在本论文的第二章，通过使用对无外力的Boltzmann方程进行证明的一种方法，我们证明了VPB系统以近似指数阶的速度Ot~(-∞收敛到全局Maxwellian状态。

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。

Firstly, some fundamental knowledge, such as the describing of laser field, the Kind of electron-atom scattering in a laser field, and so on, are introduced. Then a compution method which is called the Second-order Born approximation and is used to calculate the cross section of electron-atom scattering in a laser field, is provided.

本文首先介绍了激光场的描述、激光场中电子—原子散射的分类等相关理论，接着详细描述了一种计算激光场中电子—原子散射截面的方法——二阶玻恩近似理论。

In chapter 5 a 2D inverse technique is presented, in which the distorted Born approximation is used to speed up the convergence and the preceding INMM is employed to achieve a high speed.

第五章介绍二维低频电磁问题反演方法。为了加速收敛，采用了变形Born近似。

Due to the restriction of computational complication and precision,WRM boundary collocation method can only be used to simulate temperature fields of single-particle model,as for the case of some more complicated particle geometry shape it is very hard to obtain sufficient approximation solutions.Thus,BEM is adopted to analyze the thermal conduction problem of composites with particle of arbitrary geometry.

由于受计算复杂程度和计算精度的限制，采用加权残值法只能分析单夹杂问题，且对于更复杂的夹杂形状很难得到良好的近似解，因此接下来采用边界元方法分析了具有任意形状夹杂复合材料的温度场问题。

Due to the influence of the vdriation of the temperatures of the surrounding air and water in the reservoir, the decks and the buttresses of a buttress dam often have different temperatures.

在气温和水温的作用下，支墩与壩面具有不同的温度，因此而产生十分复杂的温度应力。本文提供一个近似的计算方法。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新