晶体群

5维不定空间中晶体群的分类

Classification of crystallographic groups in 5 - dimensional indefinite space

具有平面晶体群和扩张模群对称的三维镶嵌图的计算机可视化

The Visualization of 3D Tiling Patterns with the Symmetries of Planar Crystallographic Groups and the Extended Modular Group

稍次些的则由细小的晶体群组成，称为“圆粒钻石”和“黑钻石”。

Less perfect forms , known as " boart " and " carbonado ", are clusters of tiny crystals .

广义晶体群及其在准晶体电镜研究结果分析中的应用

Generalized Crystal Group and Its Applications in the Analysis of Research Result of Electron Microscopy of Quasicrystal

相变温度上下晶体点群分别为4mm和m。

The point groups above and below the transition temperature are Amm and m respectively .

另一套为已知晶系情况下应用CBED测定晶体点群的实验流程图，它适用于已有X射线衍射或选区电子衍射数据的情况。

The second is a special flow chart for point group determination by CBED when the crystal system of the specimen have been determined by XRD or SAED .

本文设计了两套应用会聚束电子衍射（CBED）测定晶体点群的优化实验流程图。

In this paper , two sets of flow charts for point group determination by convergent beam electron diffraction ( CBED ) were given .

Na2CO3和Na2SO4杂质的存在，降低了铝酸钠溶液的分解率，使分解析出氢氧化铝的粒度粗化，析出氢氧化铝晶体颗粒群的分维数随溶液中碳酸钠和硫酸钠杂质浓度的增加而不断增大。

Both sodium carbonate and sodium sulfate in sodium aluminate solution could reduce the precipitation ratio and make the size of aluminum hydroxide precipitation coarser . The fractal dimension of PSD went up with the increase of the concentration of sodium carbonate or sodium sulfate .

周期性极化晶体的群速匹配飞秒脉冲光学参量放大

Femtosecond Optical Parametric Amplification with Group Velocity Matching for Periodically Poled KTP

一水盐酸环丙沙星晶体空间群的确定

Determination of the Space Group for Ciprofloxacin Hydrochloride Monohydrate Crystals

会聚束电子衍射测定晶体点群的实验流程

Experimental process for point-group determination by convergent-beam electron diffraction

晶体点群和SO（3），O（3）群的关系

The Relation Between Symmetrical Point Groups and SO ( 3 ), O ( 3 ) Groups

实验发现丙氨酸晶体的空间群P212121对称性没有改变。

No change in the space group P212121 symmetry was observed .

光子晶体光纤中群速度失配对脉冲俘获的影响

Influence of group velocity mismatch on pulse trapping in photonic crystal fiber

晶体结构空间群对称元素分布

Distribution of Symmetry Elements of Space Group in Crystal Structure

厚度递减的光子晶体多通道群延迟的实现

Realization of multichannel group delay based on thickness-tapered photonic crystals

晶体结构空间群的变化

Change variation of space group of crystal structure

应用等效折射率模型对折射率导模光子晶体光纤的群速度色散特性进行了详细的讨论。

The group velocity dispersion properties of photonic crystal fiber ( PCF ) were investigated in detail by equivalent index model .

根据x光衍射及铁电测量，确定了在室温时晶体的点群。

The point groups of the crystals at room temperature were determined by means of X & ray diffraction and ferroelectric measurement .

基于标量近似理论，使用有效折射率方法对光子晶体光纤的群速度色散特性进行了详尽研究。

Based on a scalar approximation , the group-velocity-dispersion properties of photonic crystal fiber ( PCF ) were investigated in detail by equivalent-index model .

在此基础上，设计了超短脉冲三倍频群速度补偿方案，方案采用了晶体双折射群速度补偿、以及极化旋转技术。

Based on phase mismatch compensation , a scheme of group velocity compensation in frequency tripling is designed by compensation principle of birefringence and polarization rotation .

文中详细描述了各个晶体的空间群、晶胞参数、晶体衍射参数及各种键长、键角数据。

Different kinds of bond lengths and angles , space group , crystal cell parameters and crystal diffraction parameters were described in detail in this paper .

初步Χ射线晶体学研究确定：此酶晶体属於C2空间群，不对称单位内含有半个分子，分子坐落在二重轴上。

The preliminary crystallographic study shows that GAPDH crystal belongs to C2 space group , there is only half molecule per asymmetric unit and the molecule located at the 2-fold axis .

本文介绍了双轴晶体五种点群有效二阶非线性系数d（eff）~Ⅰ、d（eff）~Ⅱ在光率体主轴坐标平面上的解析表达式。

The paper introduces the analytic representation of the effective second nonlinear coefficients for 5 groups of biaxial crystals in the coordinate planes of optical ellipsoid .

层状结构的Ti3SiC2陶瓷属于六方晶体结构，空间群为P63/mmc。

The layered ceramic material Ti_3SiC_2 has a hexagonal crystallographic structure with space group P6_3 / mmc .

由Kronig-Penney模型导出了光波在一维光子晶体中传播的群速度的解析表达式，利用传输矩阵法对一维光子晶体的色散关系和群速度分布特征进行了数值研究。

The group velocity of optical waves through one-dimensional photonic crystals is investigated based on Kronig-Penney model , whose exact analytic expression is derived via the transfer matrix method . The dispersion relation and the characteristics of group velocity distribution are discussed .

光子晶体波导中的群速减慢及群速色散

The Simulation Analysis of Slow Light and Group Velocity Dispersion in Photonic Crystal Waveguides

该类化合物为层状的六方晶体结构，空间群为P63/mmc；

The compounds are layered hexagonal structures with group space of P6 3 / mmc .

因此，本文重点研究了如何在光子晶体波导中实现群速可控。

The emphases of this paper is to realize the group velocity controllable in photonic crystal waveguides .

主要完成的工作和成果如下：（1）设计了群速度色散的计算方法。通过群速度计算方法计算出光子晶体缺陷模式的群速度色散。

The main works and innovative results are listed as follow : ( 1 ) Here we design the calculation method for group velocity dispersion , and calculate group velocity dispersion of defect mode from group velocity simulated by previous simulation .