晶体

Because of the collective modulation of the periodic dielectric distribution to the incident electromagnetic waves, the directions of the group velocity and the phase velocity can be opposite, a photonic crystal slab can work as a negative refractive-index material.

由于介电函数的周期性分布对入射光的调制作用，使得特定频率区域的入射光在光子晶体中传播时的群速度方向和相速度方向相反，因而使得光子晶体平板表现出负折射特性。

The principles of laser frequency transformation and the theory of phase matching in nonlinear optic crystals are also discussed. Based on this theory, angle of phase match is calculated.

在总结激光频率变换的原理和非线性光学晶体的相位匹配理论的基础上，可以根据相位匹配理论进行晶体的相位匹配角的计算。

Based on the crystal growth elementary principle,a plagioclase crystalline velocity equation is suggested.

从晶体生长的基本原理出发，提出了按非连续机制生长的斜长石晶体结晶速率表达式。

A revised plane wave expansion method for calculating the band structure of photonic crystals is presented.

采用一种改进的平面波展开法，运用一种有效的设计二维各向异性光子晶体的方法，在低频和高频区域内获得了具有较大禁带的两种二维光子晶体。

Physicochemical properties of CPC/BMP compositeUnder scanning electron microscope the CPC/BMP composite was found to consist primarily of platy crystals, granular crystals and some small rod-like crystals with micropores about 5-50 urn in size.

一、CPC/BMP复合人工骨的理化特性通过扫描电镜可见CPC/BMP复合物由不规则的扁平状、颗粒状和棒状晶体构成，晶体颗粒互相连接附着，之间充满均匀而又不规则的孔隙，大小约为10～50μm。

The polytypic structure of crystal grown in the [1 ■00] direction perfectly succeeds to that of the seed,and thus polytype inclusions never occur during growth.

利用光学显微镜对晶体表面及腐蚀后的晶片进行观察，发现沿[1 ■00]方向生长出的单晶与传统方法沿[0001]方向生长单晶有很多的不同之处，多型对于籽晶的继承性非常强，但是在生长过程中多型夹杂不会发生，该方法生长的晶体中没有发现螺位错缺陷。

Characteristics and Significance of Polytypes and Chemical Compositions of Phengite in Lancang Group, Southwest Yunnan Province;2. The polytypic structure of crystal grown in the [1 ■00] direction perfectly succeeds to that of the seed,and thus polytype inclusions never occur during growth.

利用光学显微镜对晶体表面及腐蚀后的晶片进行观察，发现沿[1 ■00]方向生长出的单晶与传统方法沿[0001]方向生长单晶有很多的不同之处，多型对于籽晶的继承性非常强，但是在生长过程中多型夹杂不会发生，该方法生长的晶体中没有发现螺位错缺陷。

By thermally bonding the YAG crystal with 2 mm thick Nd∶YAG crystal,the Porro prism supplies multi-functions such as laser amplification,closuring the light path,polarization sensitivity to the 946 nm and so on.

直角棱镜由无掺杂的YAG晶体和2 mm厚的Nd∶YAG晶体热键合形成，可提供激光增益、光路闭合及对946 nm激光起偏等多种复合功能。角锥棱镜由熔融石英材料构成，在环形永磁铁作用下，提供法拉第旋转作用。

Potassium chloride crystal ; potassium bromide crystal ; xenon ion implantation ; color centers ; spectral parameters

氯化钾晶体；溴化钾晶体；氙离子注入；色心；光谱参数

With the improvement in the standard of living,in pursuit of jewelry - personalized. On the basis of the traditional gemstones, recent years, some beautiful new mineral into the jewelry market. It is more popular because of its beautiful and cheap. Prehnite is one of them.

随着人们生活水平的日益提高，人们对于宝石的需求日益多样化，葡萄石等一些矿物晶体受到了人们的喜爱，随之而来的以这些矿物晶体冒充高档宝玉石，以次充好等欺骗消费者的现象也开始出现。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。