晶体

The anisotropic Bragg diffraction properties of volume gratings in photorefractive crystals were investigated by the method of the couple wave theory.

利用耦合波理论分析了光折变晶体中体光栅的各向异性衍射性能，研究了在不同初始记录光强比的条件下，记录光入射角的改变对光折变体光栅各向异性布喇格衍射性能的影响。

Fully regarded the piezoelectric effect, the electrooptic effect caused by the applied electric field and based on the equation of diffraction efficiency and Bragg condition, the of between the applied electric field, the writing beam ratio with respect to the writing angles are analyzed.

全面考虑了电场作用下晶体的压电和电光效应，基于衍射效率公式和光栅的布拉格条件，给出了为获得最佳衍射效率比时外加电场及写入光束比与记录角度间的关系曲线。

A rigorous coupled wave theory for the Bragg diffraction of a Gaussian beam in the uniaxial crystal is derived and a group of rigorous coupled wave equations and diffraction efficiency formula are obtained in terms of the proper coordinate transformation and Riemann method .

利用适当的坐标变换和黎曼方法建立了高斯光束在单轴晶体中布拉格衍射的严格的耦合波理论，获得了一组严格的耦合波方程和衍射效率计算公式，讨论了衍射效率随折射率调制量的关系以及波长选择性和角度选择性，同时分析了衍射效率对再现光宽度的要求。

Introducing the Darwin's method of treating x-ray diffraction in crystals into Bragg diffraction for multilayer structure, a series of analytical expressions are obtained, which can be used to calculate the reflectivity, the Darwin's width, the minimum number of periods and the energy resolution.

将晶体动力学衍射的Darwin理论运用到多层膜对称Bragg反射中，给出了一系列解析表达式，可计算强度比、反射线角宽度、最小周期数及能量分辨率等。

Similarly there emerges a new branch of dispersion relation curve in the original frequency gap.

首先简要概述了极性晶体中的极化激元的基本特性，它的研究历史和现状。

It consists of a bridgeable divide-by-8 prescaler with an integrated preamplifier, a 15-bit programmable divider, a crystal oscillator and a reference divider with two selectable divider ratios (512 / 1024), and a phase/frequency detector together with a charge pump which drives the tuning amplifier.

它包括一个集成前置放大器，一个15位可编程分频器，晶体振荡器和一个带有两个可选分率（512 / 1024），和相位/频率检测器连同参考分频器的弥合的分频8预分频器电荷泵的驱动器调谐放大器。

In addition, conditions for growing CdTe-based materials using the unseeded vertical Bridgeman technique were studied.

在此基础上，可用高质量的CdTe-基衬底，采用竖直进衬底、水平生长的垂直浸渍液相外延系统生长出组份均匀（△x≤0.002）、晶体结构均匀及质量高（平均FWHM≈35arcsec）、表面光亮的Hg〓Cd〓Te薄膜，其在77K的空穴浓度为（0.5~6）×10〓cm〓，迁移率大于150cm〓/V·s。

The new method presented in this paper, a modified non-vacuum Bridgeman method, is suitable for growing lead fluoride crystals with large size and excellent quality.

文章介绍的掺脱氧剂非真空生长新技术既摆脱了真空法中设备投资大和工艺复杂的缺点，而且生长出的晶体性能优越，其透光率、吸收边、透光均匀性、能量分辨率和抗辐照损伤能力均可满足实用要求，处于世界领先水平。

In this paper, a modified Bridgman method and the crystal defects are deeply researched.

针对于此，本文对改进的布里奇曼法生长CZT单晶体及晶体缺陷进行了深入研究。

Several types of macro-defects existed in the BGO crystal grown by the Bridgman method.

下降法生长的 BGO晶体中存在几种典型的宏观缺陷。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。