数值计算

A modified characteristic line method for numerical calculation of steady oscillating current is proposed.

本文研究了气液活塞泵的运动机理，提出了一种用于定常振荡流数值计算的"修正特征线法"。

It avoided the complicated number calculation of the characteristic matrix method ,and can get with the result with the characteristic matrix method homology.

它避免了常用的特征矩阵法中对反射率复杂的数值计算，并能得到与特征矩阵法相同的结果。

The effect of electric field and operation temperature onthe steady and transient state properties of chromophore orientation were discussed.

利用数值计算方法求解了这一方程，并讨论了外加电场、温度对生色团取向的稳态和动态特性的影响。

The isothermal time independent flow for power-law fluid in a helical pipe with circular section is studied with theoretic method and numerical method in the paper.

本论文在前人工作的基础上，采用理论方法和数值计算方法研究了幂律流体在圆截面螺旋管道内的等温定常流动。

A analytical expression of spectral bandwidth is obtained through retaining term of first order(when expanding circular frequence of wave vector in Taylor series).

利用该解析式，采用数值计算的方法，分别研究了带宽随信号光波长、抽运光波长和非共线角的变化规律。

The present method has not only solved the field distribution computation of irregular domain, but also overcomed limitations of mesh dividing of the multigrid method when"coarsen"meshes.

本文将一种高效、快速求解Laplacc边值问题的数值计算方法——多重网格法引入到求解电子光学旋转对称场分布问题。

Contain a "scientific and engineering numerical calculation method," a book full source code.

内容包含了《科学与工程数值计算算法》一书中全部的源代码。

A numerical calculation program is written up for the various solution methods in this paper and the program is being used in various aspects of inverse problem of environmental hydraulics, including inverse problem in reverse process of one-dimensional unstable diffusion, inverse problem in reverse process of convection-diffusion, inverse problem for the dispersion coefficient in water quality model, The inverse problem of coefficient identification for nonlinear Boussinesq equation, parameter identification inverse problem for water quality model, the inversion of parameter of BOD-DO water model, the inverse problem of the source of convection-diffusion, identification of the steady-state permeability for two dimensional isotropic medium, two-dimensional steady inverse problem of convection-diffusion and parameter identification inverse problem for two-dimensional parabolic equation, etc.

对本文提出的各种算法，编制了数值计算程序，并把它应用于环境水力学反问题诸多领域，包括污染物一维非恒定扩散逆过程反问题，对流扩散方程逆过程反问题，河流水质纵向弥散系数反问题，非线性Boussinesq方程反问题，河流水质多参数识别反问题，BOD-DO水质模型参数反演问题，对流—扩散方程源项反问题及二维恒定各向同性介质渗透系数反问题，二维定常对流——扩散方程及二维抛物型方程参数控制反问题等。

The paper also shows that the numerical analysis has played a very meaningful role in the cofferdam design. Based on the monitoring data, the feedback analysis and optimization validation of cofferdam is carried out.

再者文章深刻阐述了数值计算在围堰设计中的重要作用，并结合实测资料，分析了二期围堰的工作性状，进行了围堰的反馈分析和优化验证。

It is also shown for the first time that DQEM could be regarded as the combinations of the sub-domain method with the special mixed collocation method.

微分求积法和微分求积单元法是在近年里发展起来，并正在进一步发展的一种数值计算方法，本文对这两种方法的原理和它们在结构力学中的应用进行了较深入系统地研究。

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