数值计算

The mild-slope equation with current effects is reformulated to an inhomogeneous Helmholtz equation. Applying the conventional boundary element method to this inhomogeneous equation, the inhomogeneous part will result in a domain integral which makes the computation complicated and messy. To improve this drawback, the DRBEM is adopted to transform the domain integral to boundary integral.

首先将含水流效应之缓坡方程式重新整理为非齐次之Helmholtz方程式，再利用Green公式改写为积分方程式，但利用一般传统边界元素法解析时，将存在一领域积分项，使得边界元素法显得繁杂且不完美，为改善此一缺陷，本文乃应用双互换边界元素法之技巧，以节省大量之数值计算时间。

The torsional model is solved by numerical method by considering the boundary condition and initial condition.

在给定初始条件和边界条件的情况下，采用数值计算方法求解了钻柱扭振模型。

Numerical calculation results are given and compared with those by the direct integral of the Collins formula and by using Wen's method.

给出了数值计算结果，并与直接积分Collins公式和使用Wen方法的结果作了比较。

By using the analytical formula and diffraction integral formula,some numerical simulation comparisons are done,and it is shown that the results of the two methods are completely coincident.

数值计算显示，应用解析表达式所得的结果与应用衍射积分公式所得的结果完全一致。

The vector surface integral equation can't be applied to numerical computation directly because its integrands possess the high order singularity.

矢量的面积分方程因其被积函数具有高阶奇异性，不能直接应用於数值计算。

Numeric computation indicated the best effective interferer could be attained with rational modeling.

数值计算表明：针对不同的激光波长，存在一个最佳的烟幕微粒参数，使对激光的干扰效果达到最佳。

The numerical calculation and influencing factors of casing well resistivity logging are studied.The response equation of resistivity logging is established based on the electromagnetic field theory and the distribution characteristics of the electric field in the intermediate zone.

根据电磁场理论和中场区电场分布特点，建立套管井地层电阻率测井测井响应方程，用传输线理论分析了套管井测井数值计算的可行性，分析了水泥环、地层电阻率、套管厚度等因素对测井响应的影响。

Numerical results show that there is no rigorous intermittency behavior in the frame of the model.

数值计算表明，在该模型中没有严格的间歇现象。

In this thesis,we will focus on the study of the syn-chronous chaos and on-off intermittency in coupled oscillator systems.Weobserve rich phenomena and find mechanisms underlying these phenomena.

在本文中，我们重点以耦合混沌振子系统为研究对象，在理论分析和数值计算的基础上，研究各种丰富的混沌同步及开关阵发现象，揭示其内在的规律性。

The basic principle of modern numerical computation is to preserve the intrinsical character of the original problems.

现代数值计算的基本原则是尽可能保持原问题的本质特征。

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