晶体

Crystal structural analysis reveals that, because water molecules bond to Cu atoms, the dhbd ligand can only adopt a hydroxyl oxygen atom to bridge two reversed U-shaped subunits into a novel centrosymmetric dual-U-shaped tetranuclear Cu structure. Each U-shaped frame consists of two crystallographically distinct Cu atoms, two dpphen ligands and one coordinated water molecule.

晶体结构分析表明，由于水的配位阻断， 2，3-二羟基丁二酸根仅通过单羟基氧桥联两个U形双核亚单元形成具有一个对称中心的双U形四核结构，其中U型亚单元包含晶体学上不对称的2个Cu原子、1个2，3-二羟基丁二酸根、2个4，7-二苯基-1，10-邻菲咯啉和1个配位H2O分子。

Based on the problem of various types of catalyst and according to the features of carbonylation catalysts reactions, our team has been designed a series of new metal complexes of benimidazoles, which can be used for carbonylation catalyst of industry. Seven new benzimidazole derivatives were prepared by the o-phenylenediamine、oxalic acid、glycolic acid、monomethyl monopotassium malonate、ethyl cyanoacetate、succinic anhydride. The structures of them were confirmed by IR、Elemental analsis. The crystal structures of d and e were determined by X-ray single crystal diffraction of Germanic Bruker Smart APEX II CCD. The catalysis of them was tested by carbonylation reactions.

本文设计以邻苯二胺和草酸、羟基乙酸、丙二酸单甲酯、氰基乙酸乙酯、丁二酸单甲酯为原料采用PPA催化和无机酸催化法，合成了4种苯并咪唑-2-羧酸衍生物并进行了表征；培养了2个化合物d、e的晶体并测定和讨论了晶体结构；制备了3种未见报道的苯并咪唑金属配合物，对配合物在羰基化法制醋酐-醋酸反应的催化作用进行了初步试验。

The as-grown sapphire boule (φ110×80mm3) turns out colorless and transparent after being decolourized and decarbonized in air and hydrogen successively at high temperature.

将TGT法生长的Al2O3晶体(φ110×80mm3)依次经过高温氧化气氛、高温还原气氛脱碳、去色退火实验，即&两步法&退火实验，晶体变成无色、透明。

On the basis of developing a new technology to synthesize sodium diacetate successfully without any pollution,the culture of bigger crystal in perfect shape and single crystal of small dimension suitable for X-ray diffraction was attained.

在研究成功双乙酸钠零污染合成工艺的基础上，培养成功了晶型完美的大尺寸晶体和适宜进行X光结构分析的小尺寸单晶，并进一步应用四圆衍射仪测得其晶体结构。

The crystal monochromator is a key device of the X-ray beamline. It uses crystals as dispersive elements to diffract and separate the synchrotron radiation, and provide X-ray monochmmatic light with a given energy bandwidth.

晶体单色仪是X射线光束线上的关键设备，它用晶体作为色散元件，衍射、分离具有连续光谱的同步辐射，向用户提供一定带宽的X射线单色光。

PAM can induce the formation of calcium oxalate dihydrate crystals and change the morphology of COD and calcium oxalate monohydrate crystals.

PAM可以诱导二水草酸钙晶体生成并改变COD和一水草酸钙晶体的形貌。

Superior chemical stability was found for both glass-ceramics before or after heat-pressing.7. In this experiment, all-ceramic restoratives were made with experimental lithium disilicate glass-ceramic using dental heat-pressing technique.

结果表明：热压铸对实验二硅酸锂玻璃陶瓷的晶相组成和晶体含量无显著影响，热压前后玻璃陶瓷均是以二硅酸锂为主晶相；热压后二硅酸锂晶体尺寸轻度增大，呈现出一定程度的定向排列趋势；热压前后实验二硅酸锂玻璃陶瓷均表现出良好的化学稳定性。7。

CuS and CdS nano-particulate films were obtained with these two methods, and some interesting phenomena were observed: under the Gibbs film formed by CTAB, CuS nano-rods were obtained at the oil/water interface, and disklike aggregates of CdS nano-crystals were obtained at both the air/water and oil/water interfaces; under the Langmuir film formed by NaAOT at air/water interface, disk-like aggregates of CdS were also obtained.

利用此两种反应技术，制备了CuS和CdS颗粒膜，并研究了它们的一些光电性质；在Gibbs膜下，得到了棒状CuS纳米晶。由发现的表面活性剂形成的带状物，提出棒状CuS晶体是以带状聚集体为模板形成的；在液-液、气-液界面Gibbs膜下反应中，发现CdS纳米颗粒的盘状聚集体的形成，这是由于表面活性剂在界面上形成的二维胶束而造成的；在气-液界面上Langmuir下的反应中，也发现CdS盘状晶体的生成。

In contrast with the detected space group of the crystal, the newly discovered ditrigonal scalenohedral negative crystal inclusions showed the m symmetry of the crystal with space group symmetry R 3c.

晶体中发现复三方偏三角面体的负晶包裹体，其宏观对称属3m，它与空间群R3c相对应，但与测出晶体结构的空间群有矛盾。X射线结构测定已否定了其空间群为R3m的看法。

One inclusion was formed within the exosporium and remained with the spore after mother cell lysis.

当芽胞形成细胞裂解后，一种晶体被释放出来，形成自由的伴胞晶体，另一种则始终和芽胞粘连在一起。

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。