散射

Its distinct advantages are simple implement,and that the calculation of any far field component depends only on the value of near field component at the same time over a closed surface.

论文还改进了时域有限差分方法中的总场散射场的分离技术，消除了原来因为分离带来的计算误差，提高了散射计算的精度。

Results indicate that each land cover type has uniform rule of backscatter coefficient variation in different time.

研究结果表明，虽然同种类型的地物在同一景雷达图像上的后向散射系数存在一定的差异，但是其后向散射系数随时间的变化规律却是一致的。

Therefore, to find efficient computational methods is one of important subject in this research field.

光学和电磁学等领域中的散射和反散射问题是数学物理中的一个重要的研究领域，有着广泛的应用背景。

The competition between constructive interference and stimulated electronicRaman scattering via equal-frequency hybrid excitation in a Na2-Na system isexperimentally observed for the first time.

在基于等频混合激发而产生受激电子喇曼散射的实验中，首次观察到相干相长与受激电子喇曼散射之间的竞争效应。

Take the method of "subarea" and "conjunction" to segment the whole request model to three parts. Making use of boundary continuousness between medium and lining structure at stress and displacement, construct a wave function that can satisfy the stress boundary condition at horizontal surface by the scattering of SH-waves in circular part. And then, availing of the wave function, conjoin the circular part into the semi-circular hollow space at common boundary. The problem can be reduced to solve the question that can only meet the condition of "conjunction". Finally, the solution of the problem can be summarized to a series of algebraic equations and solved numerically by truncating the finite terms of the infinite algebraic equations.

采用"分区"与"契合"的方法，将整个求解区域分割成三部分，利用介质与衬砌结构在边界上的应力、位移的连续性，构造一个可以自动满足水平界面上应力边界条件的圆域对SH波散射的波函数；再利用这一波函数将圆域与半圆形凹陷半空间的"公共边界"进行"契合"，将问题简化成对一个只需满足'契合'边界条件的散射问题的求解；最终归结为对一组无穷代数方程组的求解问题，利用截断有限项的方法对其进行计算。

At last,a optical engineering software is introduced to simulate optical scattering in the deep sea water ,and studys the corelation between scattering and relative refractive index,particle density and particle size in the sea water.

最后通过光学工程软件对海水中的散射进行仿真实验，研究散射与海水中粒子密度、粒子大小和相对折射率的关系。

A detailed calculation on the scattering of a conduct disk is given by means of Incremental Length Diffraction Coefficient method and Phyzical Optics method. The relation between Radar cross section of the conduct disk and the incident angle and the relation between the optimal polarization and the incident angle are investgated and the calculation results from ILDC and that from PO are compared.

用微分边缘绕射系数法和物理光学法对金属圆盘的散射作了详细地分析计算，讨论了其极化散射特性给出了雷达截面积随角度的变化曲线并与用物理光学法计算的结果进行了对比，同时还给出了其最优极化随角度变化时的分布图。

We also have done some work about it. In this dissertation, the first, the common fluorescence spectrophotometer is used to study the ion-associated systems of cadmium-phenanthorline-bromophenol blue system and zinc-thiocyanate- crystal violet system.

同时由于目前共振光散射技术在基础理论方面尚不很完善，还需做大量的实验研究和理论探索工作，本文也在共振光散射技术理论方面进行了初步探讨。

In Chapter 6, the self-induced geometric phase of laser field when possessing cyclic attractors and the complex Berry's phase under the adiabatic evolution of backscattering coefficients when not, including the case of having noises, are considered in a two-mode ring laser with backscattering.

在第6章中讨论了具有后向散射的双模环形激光具有周期吸引子时的自诱导几何相和不具有周期吸引子时在后向散射系数绝热演化下的复Berry相。

Based on wave function expansion method, the potential functions of scattered waves are expanded into Fourier-Bessel series; and a set of cylindrical coordinate systems is utilized in such a way that it allows to solve the problem of multiple scattering; the solution is determined by imposing continuity and equilibrium conditions at the soil-pile interfaces.

采用波函数展开法，将散射波的势函数展开成Fourier-Bessel级数的形式，利用一组可以求解多散射问题的圆柱坐标系统和桩土界面处位移连续的条件，以及刚性桩的动力平衡条件，得到问题的理论解。

John Robbins lives with his family in Santa Cruz, California.

约翰罗宾和家人居住在加利福尼亚州的圣克鲁斯县。

The international background is mainly the economic ties among different nations tented to be widen and deepen at the peace and development times.

国际背景主要是和平与发展时代条件下的世界各国经济贸易联系的日益加深。