查询词典 scatterer

This paper presents a fast algorithm based on the measured equation of invariance.Conformal meshes are made along the surface of two-dimensional scatterer.Renumbering of nodes changed the original sparse matrix into band one,and the consumption of computer memory and CPU time decrease from O(N2) to O.Via this new algorithm,electrically large problem can now be rapidly solved.

提要 本文基于不变性测试方程法提出一种快速算法，在二维散射体表面建立共形差分网格后，通过对节点的重新排序，将原问题中的稀疏矩阵变换为带状稀疏阵，从而使占用的计算机内存和计算时间均由O(N2)下降为O，可以解决原来无法计算的问题。

It is shown that the kernel of the integral equation characters the boundary of scatterer, which is determined by solving it by virtual of regularity method, meanwhile, some numerical tests are given.

并给出了正交各向异性介质识别的数值实验。

The research achievement are acquired as follows: 1From mathematical models for inverse scattering in two dimensional homogenous media including Dirichlet, Neumann, Robin,all kinds of probable mixed boundaries and cracks, direct and inverse scattering are discussed, and ill-posed integral equation and indicator function method are formulated for the diverse of boundary identification. It is shown that the kernel of the integral equation characters the boundary of scatterer, which is determined by solving it by virtual of regularity method, meanwhile, some numerical tests are given.

本研究取得了如下研究成果： 1）在二维均匀介质逆散射各种边界识别的数学模型（包括Dirichlet，Neumann，Robin，各种可能的混合边界问题，裂纹问题）下，分别考虑了正散射问题和逆散射问题，推导了上述各种边界识别的不适定积分方程以及指示函数方法，由于积分方程的核充分表征了散射物的边界，由此说明只要利用正则化方法求解该积分方程，就可以确定散射物的边界，并给出了一些数值实验。

An approximation method is presented. Through the use of the Taylor expansion in the vicinity of the scatterer,the problem is directly reduced to the solution of a polynomial equation which is simpler to treat.

给出了一种反演方法，通过在散射域附近Taylor展式的应用，使得问题直接转化为易为处理的多项式方程的求解。

Moreover, a semi-classical scatterer model is applied to study this system.

此外，还用一个半经典的散射模型来研究了这一系统。

Parameter estimation of radar target scatterer plays an important role in the process of target characteristics analysis and target recognition.

摘要雷达目标散射中心的参数估计对目标特性分析和目标识别有重要意义。

In the dissertation, we apply generally time-frequency analysis method to the MSS estimation and ultrasonic scatterer spacing imaging.

论文的主要工作在于

Average scatterer spacing is one of the important parameters in describing the biological tissue microstructure and its ultrasonic scattering characteristics.

生物组织散射元平均间距是描述生物组织微观结构和超声散射特性的重要参数。

According to the results, the optimum output of random laser can be obtained by designing the parameters of scatterer based on the properties of the gain medium.

由计算结果可知，可以根据增益介质的特性来选择散射体的参数以得到随机激光的最佳输出特性。

Mean scatterer spacing is an important parameter for describing the biological tissue microstructure and its ultrasonic scattering characteristics.

生物组织散射元平均间距是描述生物组织微观结构特性和生物组织超声散射特性的重要参数。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了