Testing of semi - conducting inorganic materials ; determining the orientation of single crystals by means of x - ray diffraction 无机半导体材料的检验.第1部分:采用x射线衍射现象对
An experimental setup is presented in which the ghost diffraction phenomenon can be observed for two un - entangled photons in the same mode 摘要设计了一个实验装置，经理论计算表明，用此装置进行实验，应当可以观察到鬼衍射现象。
In order to interpret the experimental results , the radiative transfer theory is modified and the diffraction effects are considered in the modified theory 为了解释这种衍射现象，将衍射效应考虑进辐射传输模型，对辐射传输理论进行了修正。
According to the modified model , theoretical calculation is executed for light transmitted properties of chicken muscle tissues and the result is well matched with the experimental results 修正后的辐射传输理论不仅能定性地说明肌肉组织衍射现象的成因，而且其数值结果与实验现象吻合较好，说明了修正后辐射传输理论的正确性。
2 ) in order to solve the scattering and diffraction of sound radiation , in this dissertation , based on helmholtz equation and its boundary equations , modeling of three - dimensional fem is given for computing low frequency sound transfer function in small enclosures 2 )为解决声音在传播过程中所发生的散射和衍射现象，本文基于有源helmholtz方程及其边界条件，建立了求解小尺度封闭空间内低频声传递函数的三维有限元模型。
At the different recording angles , the raman - nath diffraction and bragg diffraction phenomenon are observed , respectively . then , the wavelength selectivity and the relationship of diffraction efficiency and polarization state are discussed when the recording angle of 60 ? formed by two writing beam 分别观察到了写入光束夹角不同时光栅的拉曼-奈斯衍射和布拉格衍射现象，并对双光束夹角为60时写入光栅的波长选择性及衍射效率与入射光偏振态的关系进行讨论。
In chapter 2 , firstly the physics concept of mtf and the measurement principle of irfpa mtf are shown , the main measurement methods are described in detail ; secondly the diffraction of the measurement system is analyzed from two aspects : target diffraction and crosstalk interfere ; finally the algorithm method for eliminating statistical errors of mtf is discussed 第二章从mtf的物理意义出发，首先研究了irfpamtf的测试原理，具体分析了irfpamtf的主要测试方法，讨论了适用于本项目的刀口测试法；其次，从目标衍射和串音干扰两个方面分析了测试系统的衍射现象；最后讨论了减小统计误差的mtf计算方法。
The paper introduces the fundamental theories and characters of wavelet transform , especially the multi - resolution analysis and band - pass filtering characters , puts forward the optical realization of wavelet transform of 1 - d and 2 - d signals , analyzes the optical filter systems with wavelet transform , improves the feasibility and advantages of wavelet transform used into optical information processing . as a practical and typical application of optical - wavelet - transform in the field of optical information processing , the paper makes a fairly detailed study on the special information extraction of an optical image with a wavelet - filtering system 本文详细介绍了小波变换的基本理论和性质，重点叙述了小波变换的多分辨率特性和带通滤波特性，分析了光的衍射现象与小波变换之间的内在的联系，提出了广义小波变换的概念，为光学小波分析奠定了理论基础，给出了一维和二维信号小波变换的光学实现方法，用小波变换分析了光学滤波系统，证实了小波变换用于光学信息处理的可行性和优越性。
