It is efficient since the wave field in the interiors of the unit cells are never calculated .

由于不需要计算 单元内部的波场，该方法显得很有效。

The regularity in these microstructures offers useful means of characterising these materials through the use of unit cells .

通过建立 胞 元，这些微观结构里的规律提供了有效的途径来表征这些材料。

AFM results show that with increasing dopant content the surface of the films first become rough and then smooth finally rough again which may be related to the expansion and shrinkage of anatase and rutile unit cells . 3 .

AFM结果显示随着掺杂增加，薄膜的表面首先逐渐变得粗糙，接着变得平整，然后又变得粗糙，这可能与相变过程中锐钛矿相和 金红石相的 晶格膨胀和收缩有关。

Deriving the smallest primitive unit cells necessary to describe the translational periodicity of a crystal structure is the first step toward choosing the correct space group .

导出反映晶体结构周期的最小素 单 胞是正确判断空间群的第一步，其中以还原 单 胞的选择最为理想。

Negative index materials ( NIMs ) are a new type of synthetic structures with both negative permeability and permittivity showing negative refraction properties which may be obtained by engineering the arrangement and size of unit cells .

负折射材料是一种新型的人工材料，通过设计构成材料的基本 单元及其排列方式，可以同时实现负的磁导率和介电常数，从而表现出负折射率特性。

The marching step makes use of the DtN maps for two-dimensional unit cells in each layer where the structure is invariant in the direction of the cylinder axes .

推进步骤中包括在每一排圆柱轴不变层上使用二维 单元上的DtN映射。

This is achieved by using the DtN maps which map the wave field on the boundaries of the unit cells to its normal derivative .

该方法通过使用DtN映射完成，其在 单元边界上将波场映射到其法向导数。

Effect of number of unit cells of fcc photonic crystal on property of band gaps

晶格数目对面心 立方结构光子晶体带隙的影响

It is only when the number of inner unit cells in both width and height directions is large enough Specimen 's shear modulus is nearly a constant .

当沿宽度方向 单 胞数目较大时，整体编织试件和裁剪所得试件的剪切模量相近。

Based on the unit-cell model of 3-D braided composites the composite structure is meshed by the unit cells then the stiffness of the cell-element is formulated .

本文从三维编织复合材料的细观单胞模型出发，将结构单胞作为离散 单元对三维编织复合材料进行宏观网格剖分，建立了细观单 胞元刚度矩阵的求解方法。

The defined unit cells have the brick shape which height is equal to the braiding pitch and oriented in the same reference coordinate as the composites .

该 单 胞模型为一六面体形状，其取向平行于预制件的表面，且高为编织花节长。

In order to improve the electric performance of SOFC unit cells the electrolyte membrane anode microstructure and preparation technology were studied systematically .

为了提高 SOFC模拟 电池的放电性能，对其电解质薄膜、阳极的微观结构及制备方法进行了研究，并对其综合性能进行了测试。

The character of Raman spectra is determined by vibration modes of electrons in unit cells . The intensities and frequencies are corresponded to the peaks of phonon spectrum .

拉曼光谱的特征主要来自于 原 胞中带电原子的振动模式，其峰强和频率对应声子谱中各个振动峰，本质上拉曼光谱项来自电子极化率的变化。

For the unit cells with non-zero thickness the induced current is continuous at the edges .

由于阵 单元的厚度不为零，导致阵 单元棱边上产生的感应电流不再间断。

Based on the locally resonance we design a type of two-dimensional holey phononic crystal with unit cells of resonators in this thesis .

本文即是基于局域共振机理，设计了一种含共振 单元的二维多孔声子晶体。

The Ge clusters sit preferentially on the halves of the ( 7 × 7 ) unit cells and have similar shape and uniform size .

构成超晶格的Ge团簇均位于（7×7）亚 单 胞的位置上，而且它们的形状和大小基本保持一致。

In this paper we utilize the diffraction character of X ray to analyze the parameters of unit cells and crystallinity of NaY sieves by diffractometer and make the comparison of the activity to find out the relationship between the crystallinity and the activity .

从X射线的衍射特征，分析了NaY分子筛的 单个 晶胞和结晶度的参数，并比较了它们的活性，从而找到了结晶度和活性之间的规律。

The static tensile test of unit cells was simulated by finite element method . The theoretical results were compared with the practically experimental results and the rationality and feasibility of the micro-mechanical model was checked .

对代表 单元 体模型在静态加载条件下的拉伸情况进行有限元模拟，将计算得到的理论应力应变曲线与Cu纳米／微米晶复合材料实际拉伸曲线进行比较，验证该模型的合理性与可行性。

Pseudo-Membrane Method for Analysis of Two-Dimensional Heterogeneous Materials / Structures with Periodic Unit Cells

具有周期性 单 胞的二维非均质材料/结构的拟膜分析法

The structure of the two step rectangle 3D braided composites with five direction and three demension is truly described and analyzed . Three kinds of unit cells have been divided .

对二步法方型三维 编织复合材料的三维五向结构进行了真实的描述与分析。

According to the topological analysis of the unit cells the relationship between the braiding parameters is established such as braiding angle braiding pitch fiber volume fraction dimension of composites etc.

经过对三维 编织细观结构的拓扑分析，建立了编织工艺参数之间的关系，如编织角、编织花节长、纤维体积含量、复合材料的尺寸等。

The effect of number of unit cells of the fcc photonic crystals on the property of the band gaps was investigated experimentally .

对晶格数目对面心 立方结构光子晶体带隙的影响进行了详细的实验研究。

A New Method for Dividing 4-directional Rectangular Braided Composite into Unit Cells

四向矩形编织复合材料 单 胞的新划分方法

The unit cell is established based on the measured microstructure parameters of the 2-D woven composites according to the hypothesis that woven composites are composed of repeated unit cells .

假设材料是由许多可重复的单胞组成，根据实测的二维编织复合材料细观结构参数及其周期性建立了复合材料的 单 胞。

Our teaching practice shows that the effect is very good in providing students with an understanding of the relationships among the unit cells as well as in mastering the knowledge .

教学实践证明，由于这 套模型的使用，对学生了解 晶胞间的内在联系和掌握记忆这方面知识均收到较好的效果。

According to the mechanical and electrical continuity conditions the transfer matrix between two consecutive unit cells is obtained .

根据界面上力电连续条件，推导了结构中相邻 单 胞间的传递矩阵。

Composite reciprocal lattice unit cells for cubic twins

立方孪晶的复合倒易点阵 单 胞

For different unit cells the truncation criterion of infinite series is discussed .

针对不同形状的阵 单元，本文还讨论了三维谱域法中无穷级数的截断准则。