对称元素

对称元素在解释帕脱逊图中的应用

Application of symmetry elements in the interpreta-tion of Patterson diagram

晶体结构空间群对称元素分布

Distribution of Symmetry Elements of Space Group in Crystal Structure

本文描述了分子结构中较为抽象的对称元素&象转轴Sn并揭示了象转轴与有机物旋光性的关系。

Rotation-reflection axis Sn , an abstract symmetry element in molecular structure , is described and the relation between rotation-reflection axis and optical activity of organic compounds is revealed in the paper .

引进一个有限羣，其元素乃是分布于一个磁原胞内的空间羣的元素。该羣的对称元素作用于次晶格的自旋密度上，使热力势保持不变。

A finite group , formed of those elements of the space group which are distributed within a magnetic unit cell , is introduced .

结合实例设计并制作了分子的对称元素及其对称操作以及分子的10种点群的计算机三维动画。

The symmetric elements , symmetric operation , and ten kinds of molecular point groups combined with typical examples were designed and displayed in the form of the three dimentional animation .

本文通过研究与晶体中轴性对称元素相联系的基本对称操作对应的变换矩阵，提出了一个关于晶体对称性定理的完全证明。

This short note presents a complete proof of the Theorem of Symmetry of Crystals by studying the transformation matrixes corresponding to the primary symmetry operations associated with the axial symmetry elements in crystals .

在BZ代数中引入元素周期的概念，并讨论了零对称BZ代数元素周期的重要性质。

The notion of periods of elements in BZ algebras is introduced , and its important properties in the frame of zero symmetric BZ algebras are discussed .

零对称BZ-代数元素周期的性质

Properties of periods of elements in zero-symmetric BZ-algebras

由于积分困难，常用近似积分求得刚度矩阵，这种近似积分对于靠近旋转对称轴的元素，误差很大，所以，长期以来，被认为不满意的办法。

It is difficult to obtain the rigidity matrix by exact integration , and as approximations close to the symmetrical axis , the accuracy of this approximation deteriorates very rapidly .

三维非对称静电系统边界元素法的数值分析及应用软件

Numerical Analysis and Applied Software of Non-Rotational Symmetry 3D Electrostatic Systems Using Boundary Element Method

定义了与编织材料几何结构对称群有关的对称操作和对称元素等概念；

Symmetric operations and symmetric elements of braided geometric structures are defined .

定义一种新的对称性，以恢复调制结构失去的对称元素。

A new kind of symmetry is defined so as to restore the lost symmetry elements of a modulated structure .