晶体

Based on crystalline plasticity slip and strain hardening model, a rate-independent polycrystalline plasticity model was developed and introduced into finite element method.

基于晶体塑性变形的滑移机理和微观硬化机制，建立了相应的运动学描述和基于率无关的晶体本构方程。

The absorption properties of Nd:YVO4 crystals with various doping levels and lengths are reported.The 1 064 nm laser properties are compared,and the effective stimulated emission crosssections of different doping levels are calculated with upper-level life-times we have measured.Our investigation give a good advice for the optimization of LD end-pumped Nd:YVO4 laser.

对多种掺杂浓度、长度的Nd：YVO4晶体进行了吸收性质、激光性质的研究和对比，根据实验结果和测得的上能级寿命计算了不同掺杂浓度Nd：YVO4晶体的有效受激发射截面，对激光二极管端面泵浦Nd：YVO4固体激光器的最优化有实际指导意义。

A method for making Bisphenol A with a purity of more than 99.7% by reacting phenol and acetone using an acid catalyst, separating a BPA-phenol adduct by crystallisation and removing phenol from the adduct, in which involves continuous suspension crystallisation with a total dwell time of more than 4 hours in at least 3 crystallisers, by cooling first to 50-70 C in two parallel crystallisers and then to 40-50 C in a third crystalliser connected in series with the first two.; A method for the production of Bisphenol A with a purity of more than 99.7%, by reacting phenol with acetone in presence of an acid catalyst, separating a BPA-phenol adduct from the product mixture by crystallisation, filtration and washing, and removing the phenol from the adduct, in which stage involves continuous suspension crystallisation in at least three crystallisers connected in such a way that the mixture is first cooled to 50-70 C in two crystallisers in parallel and then cooled to 40-50 C in a third crystalliser in series with the first two, the total residence time of the mixture over all crystallisers being more than 4 hours.

描述用于生产纯度大于99.7％的双酚例如，双酚A(BPA的方法，这种方法包含苯酚和丙酮在有酸性催化剂参与的情况下反应形成一个包含双酚的产物混合物；通过结晶、过滤和洗涤从该产物混合物中以双酚/苯酚复合物的形式除去至少一部分双酚以提供双酚A/苯酚复合物晶体；并且从双酚/苯酚复合物晶体中除去至少一部分的苯酚以提供纯度大于99.7％的双酚；其中结晶过程包括连续的混悬液结晶，并且是在至少三个结晶装置中进行的，装置的排列使得产物混合物首先在结晶过程的第一阶段在第一个结晶装置和并联的第二个结晶装置中被冷却到50至70℃的温度，随后在结晶过程的第二阶段在与第一和第二个结晶装置下游串联的第三个结晶装置中被冷却到40至50℃的温度，并且其中产物混合物在结晶过程中的总驻留时间在4小时以上。

Product: KTiOPO4 crystal is a non linear optical crystal with excellent performance. It is characterized by large non linear coefficient, large sufferance temperature and angle, stable chemical quality and hard to be deliquesced,heat and concussion resistance, suitable mechanical toughness and up

产品：磷酸钛氧钾晶体是一种性能非常优良的非线性光学晶体，它具有非线性系数大，容许温度和容许角度大，化学性质稳定，不易潮解、抗热冲击性能好，机械强度适中，倍频转化效率高达70％以上等特性，是Nd：YAG激光器（1064nm→532nm）的最佳倍频材料。

It is characterized by large non linear coefficient, large sufferance temperature and angle, stable chemical quality and hard to be deliquesced,heat and concussion resistance, suitable mechanical toughness and up to 70% octave band transforming rate etc., so it is a best octave band material for Nd: YAG laser generator（1064nm→532nm）.

产品：磷酸钛氧钾晶体是一种性能非常优良的非线性光学晶体，它具有非线性系数大，容许温度和容许角度大，化学性质稳定，不易潮解、抗热冲击性能好，机械强度适中，倍频转化效率高达70％以上等特性，是Nd：YAG激光器（1064nm→532nm）的最佳倍频材料。

Based on the sense of Glass constant in photovoltaic effect,a theoretical model for carriers competition effect in photovoltaic solitons forming proces...

基于此，分析了折射率变化为负的光生伏打晶体在背景光和信号光Glass常量比大于1条件下的载流子竞争效应，得到了与实验现象和已知理论分析相一致的结论。研究表明，背景光引起的载流子竞争效应是影响晶体自散焦向自聚焦特性转换的内在物理本质。

In the case of short light pulses irradiance, photovoltaic effect has no effect on the writing and erasing photorefractive gratings in the LiNbO3 crystal.

因此，在短脉冲光入射光折变晶体材料情况下，考虑光生伏打效应与不考虑光伏效应，对短脉冲光在光折变LiNbO3晶体中写入和擦除光栅基本没有影响。

Slow crystal formation gives quite pure crystals that probably need not be recrystallized for the optical activity studies.

缓慢的结晶过程会给出十分纯的晶体，在光学活性的研究中，这些晶体很可能不需要进行再结晶了。

Based on analyzing the optical activity of BSO and the principle and structure of the BSO-based optical-addressed spatial light modulator, the influences of the optical activity of BSO on the performance of SLM are concluded.

对BSO晶体的旋光效应特性及BSO基光寻址空间光调制器的结构及工作原理的研究表明晶体旋光效应会影响空间光调制器的图像转换质量。

Most are crystal oscillators that take advantage of the inherent resonance of a crystal to obtain frequency stability.

大多数是晶体振荡器，它利用晶体固有共振的优点，所以频率稳定。

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。