查询词典 method of approximation

Based on the above results, the problems of the electromagnetic interaction between a perfect conducting plate and 1-D/2-D conducting slightly random rough surface and the problems of the electromagnetic interaction between a dielectric spherical particle and dielectric slightly random rough surface are investigated. By using the reciprocity theorem, Small Perturbation Method and Physical Optics approximation, the solution for the composite scattering field from the composite target is derived and evaluated, and the numerical results are discussed and analyzed.

在此基础上，用互易性原理分别研究了一维、二维导体微粗糙面与其上方金属导体平板目标的复合电磁散射及介质粗糙面与其上方球形粒子的复合电磁散射，结合互易性原理和粗糙面散射微扰法及物理光学近似导出了复合散射场的计算公式并进行了数值计算，对计算结果进行了讨论和分析。

First introduced the lattice-value information systems knowledge, and to partial order for the basis has been a new relationship: advantage, given the reduction and the core, the concept of simplifying the classification of features, it is also given on the approximation, and the approximate reduction of matrix determined theorem and the concept of identification, the final adoption of specific reduction of examples to illustrate this method is effective.

首先介绍了格值信息系统的相关知识，并以偏序关系为基础得到了一种新的关系：优势关系，给出了约简和核心，简化了概念的分类特征，也给出了上近似、下近似及约简的判定定理和辨识矩阵的概念，最后通过具体的例子说明这种约简方法是有效的。

Selection of response surface method with highly accurate and efficient approximation is greatly important in its application.

工程应用中选用拟合精度和拟合效率较高的响应面建模方法是其应用的关键。

In chapter 10, we propose the random weighting approximation method for distribution of sample mean under simple random sampling in one-dimensional finite population.

第十章 将随机加权法首次应用到简单随机抽样方案下的样本均值分布逼近问题中，从数字特征角度说明了随机加权方法在抽样理论中的可用性，从而拓广了随机加权法的应用范围。

They. separate the G matrix into a barenucleon-nucleon interaction V and correction term △ G. The projection method isonly applied to the correlation term △ G; which is parameterized by fourpseudo-mesons. Then the nucleon self-energy in the DBHF can be calculated with theG matrix in the relativistic Hartree-Fock approximation.

研究表明，我们利用G矩阵新的分解方法计算得出的不对称核物质自能，特别是中子物质标量自能、有效质量的结果与简单方法有很大的差别，如有效质量相差200MeV左右。

Impsons Integration: In numerical analysis, Simpson s rule is a method for numerical integration, the numerical approximation of definite integrals.

pecifically：：辛普森整合：数值分析中，辛普森法则是一种方法，数值积分，数值逼近定积分。具体来说

Using the elasticity and the singular integral equation method,an analysis of a pure bending beam containing a rigid linear inclusion is carried out under the Saint-Venant s approximation.

使用弹性力学和奇异积分方程方法，在Saint-Venant近似的精度下，对带有刚性线夹杂的纯弯曲直梁作了分析，求得了夹杂两侧的干扰界面应力及夹杂端点的应力强度因子，结果对带夹杂零件的强度设计有参考价值。

While for the sinusoidal approximation method, a detail derivation of the amplitude of each sinusoidal function is re-derived for completeness.

为完整性，文中亦详细推导正弦函数近似法中各个频率之振幅。

Its discretization is based on spectral elements in space and central differences method in time. The numerical result, shows that this approximation has spectral accuracy in space and up to second-order in time.

该解法引入一阶Clayton-Engquist-Majda吸收边界条件，在空间上利用谱元方法，在时间上利用中心差分的积分方法得到波动方程的离散形式，并给出具体算例进行了验证。

The false scattering and ray effect in spherical harmonics method ,including P-1 and P-3 approximation,is studied.

从辐射传输方程的近似求解过程出发，在定性分析的基础上构造物理模型，通过数值模拟研究球谐函数法(P1和P3近似法)的假散射和射线效应。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。