查询词典 crystal system

According to the transnational periodically symmetry of crystal plane in its space,the author introduce the Thomas-Fermi equation in crystal planar channeling electric fields;then calculate the electric fields of single crystal Si(110)and its critical angle.

根据同一晶向的晶面具有平移周期对称性，将托马斯费米方程引入晶体的平面沟道中求解Si(110 )平面沟道内的电场；然后把求得的结果用于计算平面沟道临界角。

Because the liquid crystal material is birefringent, light passing through one polarizing filter is rotated by the liquid crystal helix as it passes through the liquid crystal layer, allowing it to pass through the second polarized filter.

因为液晶材料是双折射，光线穿过一个两极化的过滤器是旋转液晶螺旋，因为它通过液晶层，允许它通过第二偏振过滤器。

It indicates that the different parts of the cattle-egg stone samples in different colours all mainly compose of pyrophyllite, coexisted by two kinds of polytype of monoclinic and triclinic pyrophyllite, and the average crystal structural formula is Al4.04 Si7.89 Al0.11O204. The aggregation of pyrophyllite arranges with no direction, and the crystal size of the single pyrophyllite crystal in the weathering skin is a little bigger than that in the basal part.

结果表明，不同颜色牛蛋石样品的不同部位皆以叶腊石为主要成分，并以叶腊石的单斜和三斜两种多型共存，其平均晶体结构化学式为Al4.04[Si7.89Al0.11O20]4；其叶腊石集合体呈无定向排列，风化皮中叶腊石单晶的粒度略大于基体中的。

It is found that there is a mineral association, micro-crystal muscovite and phengite, in this deposit. The mineral assemblage contains about 80% micro-crystal muscovite and about 20% phengite. Their crystallinity is very high and their polytype is 2M1. Both of them are dioctahedral because the d and b of micro-crystal muscovite and phengite are 0.1502 nm, 0.9012 nm and 0.1505 nm, 0.9030 nm, respectively. For their d and b are larger than those of common muscovite, the reason why Fe(superscript 2+)+Fe(superscript 3+) and Mg(superscript 2+) are high in the ore is that Al(superscript 3+) in the octahedron is replaced by Fe(superscript 2+)+Fe(superscript 3+) and Mg(superscript 2+), and this is a phengite series mineral association formed through isomorphic replacement.

该矿物组合中的微晶白云母和多硅白云母结晶度高，多型为2M1，其含量分别为80%和20%左右；二者都属二八面体型白云母类矿物，但d060和b值偏大，微晶白云母的d060=0.1502nm，b=0.9012nm，多硅白云母的d060=0.1505nm，b=0.9030nm；微晶白云母矿铝含量较低、铁镁含量较高，其原因是白云母晶体铝氧八面体中的Al离子被Fe、Mg等离子所取代，这一矿物组合是通过矿物类质同象作用所形成一种多硅白云母系列矿物。

The mode field of photonic crystal fiber structured with hexagon symmetry hole cladding was analyzed by coupled-mode, and the effective indexes of base mode of different wave length were got. The characteristics of this photonic crystal fiber grating were computed and simulated by coupled-mode method and transmission matrix method. Moreover, the differences were compared between conventional fiber grating and photonic crystal fiber grating on their reflection spectrum and delay.

利用多极法对包层空气孔为正六边形对称结构光子晶体光纤的模式场进行了分析，计算出不同波长下基模的有效折射率，结合使用模式耦合理论和传输矩阵法对基于光子晶体光纤的布拉格光栅特性进行了计算和仿真，对比了常规单模光纤所成光栅与相同光栅周期的光子晶体光纤布拉格光栅反射谱及时延特性之间的差异。

Crystal qicai raised ultraviolet VFX, that is, fast-curing properties of the Crystal, the ink holdout colorless, unscented, non-volatile, cured yellow screen leakage membership card after line non-proliferation, there are the obvious Crystal, having raised emergent, smooth and join qicai foil powder, with extremely colourful, in the light, people from different angles to watch, there will be an honour for the extraordinary variety of art refringence for free!

水晶七彩瘪下殊效，即诳骗紫外线飞快固化水晶油不朱的共性，其不朱层无色透明、无气息、不挥发，固化后不泛黄，丝网漏会员卡制息后线条不清除，有水晶般的明不隐瘪下突现，晶莹剔透，平滑细致，参增七彩箔粉后，又明灭着极其灿艳的色彩，在光芒照射下，人们从差别的角度观察，会有不别致的耻辱幻变反射般的艺术吃苦。

Product main úúú have natural tourmaline, blonde crystal, miscellaneous fat crystal, red pomegranates,é, white crystal, citrine, topaz, violet topaz, amethyst, jade Dongling, purple agate, red agate,, Johor jade, rose quartz, even stone beads, etc., even shaped, non-stereotyping, have necklaces, bracelets, carvings, shell carving, carving spar, miscellaneous pieces of sculpture, tag, angle and other products.

产品主要有天然碧玺、金发晶、杂发晶、红石榴、绿幽灵、白水晶、茶晶，黄晶，紫黄晶、紫水晶、东陵玉，紫玛瑙、红玛瑙、虎眼石、新山玉、粉晶，什石等圆珠，什形，不定型，有项链、手链、雕刻品、贝壳雕刻、晶石雕刻，杂件雕刻，吊牌，角度等系列产品。

Holding on to a faceted clear crystal star, his body shines in Golden Shadow crystal. The tail has a star-shaped Crystal Fabric application for a special effect.

手握一颗透明切割水晶心，冬日松鼠的身体以金色魅影水晶制成，尾巴的星形水晶饰布打造出特别的效果。

According to piezoelectric equation and vibration theory of quartz crystal, we studied the elastic wave＇s transmission characteristic in a AT-cut thickness-shear-vibration quartz crystal, and the frequency conditions of which quartz crystal resonator formed stationary wave in electrode district.

根据石英晶体的压电方程和晶体振动理论，研究了AT-切石英晶体厚度切变振动模式下振动频率与结构参数间的关系，以及石英晶体谐振器在电极区形成稳衡驻波的频率条件及电极区外波的传播特性。

The results indicate that, comparing with the crystallization without urea, the time of crystal occurrence is 1.5 times longer, the density of suspensoid is raised by 50%, both of crystal length and crystal width are increased, especially...

粒度分布的定量分析显示，尿素硫酸摩尔比为 3.6：1、过程温度80℃时，硫酸钙的成核速率减少了25%，但结晶成长速率增加了1.2倍，结晶粒度分布中心由72.8mm 增大到 142.8mm，平均粒径由70.98mm 增加为 105.45mm 。

Article 144 The Government of the Hong Kong Special Administrative Region shall maintain the policy previously practised in Hong Kong in respect of subventions for non-governmental organizations in fields such as education, medicine and health, culture, art, recreation, sports, social welfare and social

第一百四十四条香港特别行政区政府保持原在香港实行的对教育、医疗卫生、文化、艺术、康乐、体育、社会福利、社会工作等方面的民间团体机构的资助政策。原在香港各资助机构任职的人员均可根据原有制度继续受聘。

Small wonder, then, that the Chinese spend more in the shop than any other group of foreign visitors do .

这样的小惊喜，使中国顾客比任何国家的人消费得更多。