格林函数

Then with the intensity distribution being the optimization criterion,a new effective optimum way to design the structure of the Cassegrain reflective system is introduced here.

据此，本文提出了以该衍射效应作为卡塞格林反射系统结构优化设计的目标函数，该方法具有直观和量化的优点。

LBIE, based on the local boundary equation, adopts the traditional moving least squares approximation which depends on only the values of the nodes in the domain of the problem or along its boundary. The whole process of integration is carried on over a local domain or its local boundary centered at the node in question. The local boundary equation can be rewritten to represent the values of the unknown function at the point of interest, and the essential boundary conditions can be directly and easily enforced by using the Green formula and the characters of the Dirac function.

它以局部边界积分方程为基础，采用移动最小二乘近似函数，从而只需要分布在问题域内及其边界上的节点的信息值，无需划分单元；整个积分是在以节点为中心的局部域及其边界上实现，所以不需要背景积分网格；借助于格林公式及Dirac函数的性质，将局部边界积分方程转化为所考虑点的未知函数的边界积分表达式，便于直接施加本质边界条件。

In chapter one,we introduce the background of our work and give abrief review of polaron theory.

在第一章中，我们首先对极化子理论和格林函数理论作一个简单的综述，并综述了低维系统中的极化子理论的研究现状，进而引出本论文所要研究的主要问题。

For the dyadic Green's function, we have the constituent method, source dyadic method and the quasi source dyadic method.

对于并矢格林函数奇异性问题处理方法有：分量处理法、源并矢法和拟源并矢法等处理方法。

A new method is suggested in which velocity potential of a Kelvin source moving in infinite deep uniform fluid is taken as a basic Green function.

提出了将Kelvin源格林函数作为基本解的求解物体在分层流体中兴波问题的计算方法。

All available three-component time series are used to extract the Rayleigh and Love waves. The Signal-to-Noise Ratio at different periods and the azimuth distribution of the inter-station pairs with high SNR are discussed.

通过对三个分量记录的相关运算，获得了Rayleigh波和Love波的经验格林函数，分析了其信噪比随周期的变化和高信噪比台站对的方位分布。

Using the method of Green's function, the coupling between conformal antennas is analyzed. The mutual coupling between the E plane and the H plane are calculated, and the effect of the curvature and space between to the mutual coupling are discussed.

本文利用格林函数法分析了微带天线阵元之间的互耦效应，得到了矩形微带单元阵元之间E面、H面的互耦结果，并讨论了圆柱曲率半径和阵元的间距对阵元之间互耦的影响。

To calculate the Green function one requires the self-energy operator which is non-local and energy dependent.

为了计算格林函数，我们必须计算非局域的能量相关的自能算符。

In chapter two,we study the electron self-energy and its temperaturedependence in a polar-crystal slab using Green function method.Theinfinite-high-barrier square well is used.

在第二章中，我们利用格林函数理论讨论了极性晶体膜中极化子的性质。

In order to have an insight into the relation between the two forms of finite temperature field theory, we calculated directly the imaginary part of the"1-1"component of the twoloop self-energy in 〓 theory in TFD and gave the result in imaginary time formalism.

为了探讨温度场论两种形式之间的关系，本文以φ〓理论中的两圈自能图为例，在TFD的框架内首次直接计算了&1-1&分量格林函数的虚部，同时给出了虚时方法的结果。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。