晶体

Based on noncollinear optical parametric amplification in periodically poled lithium niobate which is realized by quasi-phase matching technology, we consider the possibility of semi-noncollinear phase matching method between collinear and noncollinear geometry.

基于周期性极化铌酸锂晶体的准相位匹配光参变放大过程，通过倾斜周期极化铌酸锂晶体中极化域一定角度，实现了介于共线匹配方式和非共线匹配方式之间的一种半非共线型准相位匹配方式，并以该匹配方式下的各光矢量几何关系得出相位匹配曲线，找到在特定抽运光和信号光波长下能获得宽带增益放大的周期极化长度。

The fabrics and crystals of one-year ice in the Bohai Sea show that the noncontiguous ice growth rate makes an ice sheet have level layers with different amount of air bubbles in lower part of the ice sheet; typical grain ice and columnar ice occur in the gray ice which grows in stable water; thaw-refrozen ice and rafted ice have their crystal characteristics.

作者中文名：李志军；康建成；蒲毅彬摘要：渤海一年冰的组构和晶体结构表现出的冰的非连续生长速率使得冰层底部具有气泡含量不同的许多分层；静水生长的灰冰具有典型的粒状冰和柱状冰；融化-重冻结冰和重叠冰具有特定的晶体结构。

Physical and chemic properties of Cr:LiSAF aresummed up. The characteristic of KN crystal is analyzed. At normal temperature, KN crystal can obtain noncritical phase match of 90 at wavelength of 857nm.

对Cr：LiSAF晶体的物理和光学性质进行了总结，同时对KN晶体各个面内的相位匹配角度和有效非线性系数进行了计算并对其相位匹配特性做了分析。

Currently, the main opacifier is zircon. Zircon crystals which formed in vitrified tiles have different refractive with glass caused light scattering, it makes vitrified tiles whiteness.

目前，玻化砖中乳浊剂主要采用的是锆英石，其增白机理是在玻化砖中形成硅酸锆晶体，利用硅酸锆晶体与玻璃相之间的折射率差使可见光发生散射，从而产生增白效果。

The structure analysis indicates that the reverse symmetry ligand H4LB molecules are linked into a 2D supermolecular network by two types of hydrogen bonds. One type occurs between the oxalamide oxygen group and the phenol hydroxyl qroup of the nearest molecule with d=2.906(2) and ∠O-H…O=151.8°. The other type is between the oxalamide nitrogen group and the oxalamide oxygen group of anther molecule with d=2.849(2),∠N-H…O=158.7°.

晶体结构研究表明配体H4L为顺式桥联分子，晶体中存在两种氢键，一种是草酰胺基团的O原子与苯环上的酚羟基形成O-H…O氢键[d=2.906(2)，∠O-H…O=151.8°]；另一种是草酰胺基团的氨基与相邻草酰胺基上的O原子形成N-H…O氢键[d=2.849(2)，∠N-H…O=158.7°]，通过上述两种氢键将化合物H4LB连接成二维网络结构。

The method of series rate is used to study the linear growth order of ammonium paratungstate crystal.

将结晶成核期后晶体的生长阶段作为线生长速率测定的时间范围，采用&串联速率法&研究了仲钨酸铵的晶体线生长级数。

This study on creep behavior of TiAl Polysynthetically Twinned crystals was carried out primarily to understand the effect of lamellar orientations on creep behavior in TiAl alloys with lamellar microstructure. It also provides a theory fundament for microstructure control and design for TiAl alloys.

为了研究片层取向对片层组织TiAl合金蠕变性能的影响，同时为合金的组织控制及设计提供理论依据，本文对TiAl金属间化合物PST晶体（Polysynthetically Twinned Crystal）的高温蠕变行为进行了较为细致的研究，并着重研究了片层相对于外力轴的取向对PST晶体蠕变性能的影响。

The structure characters of this kind of molecules were discussed. The results show that the phenyl group located in the 4- or 5- position of pyrryl ring are not coplanar with the pyrryl ring.

对这类吡咯环上4或5-位有芳环取代基时化合物的晶体结构特征进行了扼要讨论，晶体衍射实验结果表明，4， 5-位上的芳环与吡咯环本身处于非共平面结构。

The transmittance spectra and radioluminescence spectra at different positions along crys- tal growth orientation were measured and studied. The results show that the large size Y:PbWO4 crystal has good optical uniformity.

同时，对实验样品沿晶体生长方向不同部位的横向透过率及发射光谱进行了测试，结果表明，坩埚下降法生长的大尺寸Y：PbWO4晶体具有较好的光学均匀性。

One side, the endlessly single-mode property was illuminated, and the relation between V value and the structure parameter and wavelength has been given. On the other hand, the dispersion property of TIR-PCF was discussed reasonedly.

一方面，对光子晶体光纤的无尽单模特性进行了较详细研究，得到了归一化频率与结构参数以及光波波长的关系，为研制实际应用的光子晶体光纤提供了参考。

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。