晶体

Since Bloch's Theorem applies only to periodic potentials, and since unceasing random movements of atoms in a crystal disrupt periodicity, Bloch's Theorem is only an approximation, but it has proven to be a tremendously valuable approximation, without which most solid-state physics analysis would be intractable.

由于布洛赫定理仅对周期性势场的情况严格成立，而由于实际的晶体中不可避免的有各种缺陷或者原子相对于平衡位置的位移，所以布洛赫定理对于实际晶体来说只是一个近似。但是布洛赫定理对于固体物理的研究不可或缺。

The generating origin of the light field with SPDC expounded with the interaction of the pumping photons with the nonlinear crystals.

分析了单色泵浦光子流和量子真空噪声对非线性晶体的综合作用，从泵浦光与非线性晶体的相互作用过程解释了自发参量下转换光场的产生根源，推导了SPDC双光子态的数学表达式，并给出其几率解释

On the basis of analyzing the principles of interleaver filters of the interference of polarized light and planar lightwave circuit-type lattice structure, the equivalent mathematical representation of the spectral transmittance of the two kinds of interlearers is revealed. The equivalent relationships of the structural parameters of them are given.

在分析比较双折射晶体偏振光干涉型和平面波导环形格子结构型光交错复用滤波器原理的基础上，揭示了两者在光谱透射率的数学上的等效性，给出了两者结构参量之间的等效关系，可以直接利用经简单傅里叶级数对比法获得的晶体的结构参量对平面波导环形格子结构型光交错复用滤波器进行结构设计。

Rough crystals of spodumene have been found in gigantic proportions, one of the largest was a single crystal measuring over 47 feet long and weighing 90 tons!

有些锂辉石的原石晶体巨大，世界上最大的锂辉石单一晶体曾达到47英寸长，重达90吨。

The results show that the electrodeposited calcium phosphate coating was converted to pure needle-like hydroxyapatite crystals in alkaline solution, the size of crystals become stout with the increase of current density and concentration of salts, the crystals structural was changed to squama structural with elevating the temperature of electrolyte, the volume of coating increase with the increase of quantity of electric charge.

结果表明：电沉积磷酸钙盐涂层经低温碱液处理后得到纯的羟基磷灰石涂层，羟基磷灰石晶体呈针状结构；随电流密度、主盐浓度的增加，晶粒变粗，随电解液温度的升高，晶体发生变化，出现鳞片状结构；涂层质量随沉积电量的增加而增大。

On the one hand,the stimulated emission is strengthened with the increasing of the photonic crystals′ priod.

同时，光子晶体的长度和介电常量虚部的大小都会影响晶体的受激辐射。

The constitutional supercooling and internal growth striation in the SNLN crystals have been overcome and the optical homogeneity of the crystals have been improved by employing optimum growth co...

采用最佳的生长和工艺条件克服了铌酸锶钠锂晶体的组分过冷和内部生长条纹，提高了晶体的光学均匀性。

The effect of additives on the control of crystal size for sodium sulphate is discussed in the paper.

研究结果表明：十二烷基苯磺酸钠的加入增大了硫酸钠结晶过程的界面能，从而抑制自发成核过程的发生，促进晶体的生长，改善晶体的粒度。

The distribution of the cluster s in the supersaturated KDP solution and the relations between the growth driving force and the rate of temperature dropping were discussed in this article.

本文主要研究了过饱和KDP溶液中晶胚的分布情况、降温过程中晶体生长驱动力与降温速度之间的关系，并分析了KDP晶体实际生长过程中影响溶液稳定性的主要因素。

The crystallite-covered samples were immersed in the supersaturated solution, and the crystallites grew to uniform calcium phosphate coatings.

再将磷酸钙晶体覆盖的Ti6Al4V浸入过饱和溶液后，表面的磷酸钙晶体迅速生长成为均匀的磷酸钙涂层。

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。