查询词典 crystals

Fluorapatite is a crystal that contains fluoride, tooth enamel than in the general composition of hydroxyapatite crystals have a stronger corrosion resistance.

含氟是晶体，其中包含比一般的羟基磷灰石晶体组成的氟化物，牙齿珐琅质具有较强的耐腐蚀性。

ABSTRACT Yb-doped calcium fluorapatite single crystals were successfully grown by the Czochralski method.

摘 要 用高频感应提拉法生长了掺Yb3+氟磷酸钙晶体，获得了理想的生长工艺参数。

The fluorapatite crystals found in d.

这两种材料整合到一种单一的玻璃瓷中达到了光学与物理性能提升的结合。

To evaluate the bioactivity of the glass-ceramics,the specimens were soaked in the simulated body fluid. The results indicate that fluorapatite shows needle-like microstructure, which is similar to that in human bone and teeth. The formation of needle-like fluorapatite is related to the heat treatment procedure, which results in needle-like fluorapatite crystals by accelerating one-dimension growth along the c-axis through the screw dislocation growth mechanism. The mechanical properties of the glass-ceramics are close to those of the human bone and teeth. The bioactivity test results show that apatite layer is precipitated on the materials surface after 3 d immersion in SBF, which indicates the glass-ceramics have a good bioactivity.

研究结果表明：氟磷灰石相呈针状，与人体骨和牙齿的磷灰石形貌相似，有利于提高材料的生物活性和生物相容性；氟磷灰石的形成是材料被迅速加热至高温进行热处理，使磷灰石以螺旋位错生长机制沿c轴晶化长大所致；经热处理获得的材料具有优良的力学性能，基本满足骨科和齿科用生物材料的性能要求；材料在体外模拟体液中浸泡3 d后，样品表面已有磷灰石层生成，表明该材料具有较高的生物活性。

The problem with early fluorite optical systems was the difficulty in obtaining pure fluorite crystals of sufficient size.

早期使用英石的光学系统的问题是难以获得足够大的纯萤石晶体。

Metallic calcium also burns in fluorine gas, forming the fused fluoride, and occasionally minute crystals of fluorspar.

金属钙还烧伤的氟气，形成了融合氟化物，偶尔分钟和萤石晶体。

The X-ray diffraction data of single crystals were collected on a Bruker P4 four-cycle diffractometer.

本文中所有对称的和不对称的引发剂分子都是通过Wittig和Heck反应制备。

NOTES:litchi, yuzu, lemon, star magnolia, rose, freesia, amber crystals, musk and white woods.

荔枝，柚子，柠檬，木兰花，玫瑰，小苍兰，琥珀，麝香和白木。

In this thesis, we investigate frequency band structure characteristics in phononic crystals of multi-composition.

本文研究了复式晶格声子晶体的频带结构特性。

This shortly brought them to a bewitching spring, whose basin was incrusted with a frostwork of glittering crystals; it was in the midst of a cavern whose walls were supported by many fantastic pillars which had been formed by the joining of great stalactites and stalagmites together, the result of the ceaseless water-drip of centuries.

不久他们就到了一个美妙的泉水旁，水底下石头形似雪花状玲珑剔透，泉水位于石窟中间，四周石壁全由形状奇特的柱子撑着，这些石柱是大钟乳石和大石笋相连而构成的，是千万年来水滴不息的结果。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷