晶体

XRD experimental results show that the doping of Cerium change the crystal assembling and it turn out to be a kind of minicrystal which is an intergradation from crystal to unformed structure, and this structure makes the material more active catalyze performance.

XRD表征结果表明，铈的加入改变了铁氧化物载体的晶体结构，形成了介于晶体和无定型之间的微晶体结构，利于其表现出较高的催化活性。

With some examples, the correlat ions between the thermal expansion coefficients of minerals and the types of cr ystal structures, the nature of chemical bonds, the valencies of ions , the interionic distances, the percentage ionic characters, the electronic conf igurations of ions and the chemical compositions are discussed and summarised . The crystal chemistry approach has been used in the calculation of the th ermal expansion coefficients for minerals with simple structures and composition s.

晶体化学方法是研究矿物热膨胀系数的有效方法，但由于矿物的热膨胀系数和晶体化学参数之间的定量关系尚未完全弄清，目前仅仅能对简单结构矿物的热膨胀系数进行计算，结构、成分较复杂的矿物的热膨胀系数计算尚缺乏好的晶体化学模型。

Results of XRD,SEM,and UV-Vis indicated that ZnS nanocrystals can grow in and fill in the void of opal template,and SiO2 microspheres of templates are dissolved so as to form some three dimensional ordered porous structure and to form the inverse opal ZnS photonic crystals. Compared with opal templates,ZnS-opal and inverse opal ZnS photonic crystals assembled with SiO2 spheres in the same diameter show good optical properties and exhibited photonic band gap. The photonic band gap position of inverse opal ZnS moves towards UV area compared with opal and ZnS-opal.

结果表明：溶剂热法多次充填可使ZnS纳米晶在模板密堆积形成的空隙中均匀成核；经过酸处理的ZnS-opal中SiO2微球溶解、坍塌，形成蜂窝状三维有序介孔和反opal结构ZnS基光子晶体；相同粒径SiO2微球组装的opal模板、ZnS-opal以及反opal结构ZnS光子晶体均表现出光子带隙特性，但反opal结构ZnS光子晶体带隙位置相比前两者发生了蓝移。

Keywords: piezoelectric crystal; isomorph; First-principle; crystal growth

中文关键词：压电晶体；异质同构晶体；第一性原理计算；晶体生长

The method can be used to both crystal crystal and isotropic medium crystal interfaces.

这一方法既能应用于晶体-晶体界面，也能应用于各向同性媒质-晶体界面。

Cerium-doped lutetium pyrosilicate crystal was grown by using the Czochralski method. A series of problems during growth, such as volatilization of the melt, crack and sandwich inclusions, were discussed.

用提拉法生长了Lu2Si2O7：Ce晶体，讨论了晶体生长过程中的几个问题：(1)熔体挥发；(2)晶体开裂；(3)层状包裹。

On the view of crystallography, the forming process of crystal structure of MgO during the burning of magnesite and the effect on its chemical activity were discussed.

讨论了菱镁矿烟烧过程中MgO晶体结构的形成过程以及对MgO活性的影响，当菱镁矿的煅烧温度低于800℃时，由菱镁矿的晶体结构逐渐转变形成的MgO晶体结构中存在较多的缺陷，赋予MgO高的化学活性，这些缺陷位置是其与MgCl_2水溶液进行化学反应形成5.1.8相的物化活性点。

Fig.1 Shape of KDP crystal grown on a Z-cut plate seed from a metaphosphate doped solution

由这些实验现象推测，多磷酸盐能够被晶体生长表面吸附并进入晶体内部，从而严重影响晶体的光学质量。

The result showed that the Lens Image Analysis System could detect the level of lens opacification in vivo objectively and quantitatively.

通过上述实验，结果显示：晶体图像分析系统能够对活体晶体混浊程度进行实时定量检测和分析，是活体晶体混浊程度客观评价的可靠手段，对白内障的早期诊断、流行病学调查和抗白内障药物疗效评价具有重要意义。

After the transient temperature distribution has reached dynamic equilibrium, because of radius temperature gradient periodically changing with time, the optical path difference between center and edge beam is also periodically changing with time.

当晶体温度达到周期性分布后，由于晶体径向温度梯度的周期性变化，引起通过晶体的平面光波的中心和边缘光线相对光程差也随时间作周期性变化。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。