查询词典 symmetry

M.C. Escher is a great modern Dutch printer, and his works are outstanding for their artistic combination of ration and imagination and of science and art, which is closely related to his study on mathematical methods, especially the principles of symmetry in geometry.

荷兰现代版画家M.C。埃舍尔的作品兼备理性与幻想、融合了科学与艺术的双重特性，这与他坚持不懈的对数学方法，特别是几何方法中对称原理的研究有着内在联系。

We use a hybrid distance measure by the combination of the symmetry distance and the Euclidean distance.

在本论文中我们提出改进的方法，藉由使用欧几里德距离与对称性距离混合的方式作为分群基准来解决上述的问题。

When a solid region in three-space has an axis of symmetry, the evaluation of triple integrals overis often facilitated by using cylindrical coordinates.

当空间立体区域有一个对称轴时，计算上的三重积分通常使用柱坐标比较容易。

Symmetry methods play a key role in the researches of exact solutions of partial differential equation.

对称群方法在研究偏微分方程精确解的过程中扮演着重要的角色。

The variance of stress about particular points that situate on the edge where maximum stress point locates as the object function, we introduce complex method to optimize the position of exterior load point about pylon along the voyage direction and the angle between anti-swing stop and right-and-left symmetry plane about pylon under the determinate loads. We also compare the unoptimizable stress curves with the optimized to validate the feasibility and correctness of the optimization method.

将挂架上最大内应力点所在棱边的特征点的内应力方差作为目标函数，采用复合形方法对一定载荷状态下，挂架外载荷点沿航向的位置及防摆止动器与挂架左、右对称面间的夹角进行了优化设计，并将优化前、后的内应力曲线进行比较，验证了优化方法的可行性、正确性。

XRD and TEM confirmed that the novel mesoporous silica has a diamonded face centered cubic structure with Fd3m symmetry, which was first reported up to date.

同时对它的物理性能包括比表面积、孔容和孔径通过N〓吸附-脱附技术进行了测定，考察了合成条件对其结构形成的影响。

Methods An unsupervised local and global features extraction method was adopted for the localization of facial features of frontal view face image. First, a threshold was used to segment the image into foreground and background, and the nose was localized by considering the symmetry of the face. Second, Harris operator was adopted to detect interest points in a rectangular area covering all the facial features, and then local maximum of the interest points were detected. And finally, Kmeans clustering method was used to cluster the points and obtain the facial features localization.

针对红外正面脸部图像，采用一种无监督的局部和全局的特征提取方法，首先通过阈值法区分出前景和背景，并根据面部特征对称性在前景中确定鼻区；然后在面部确定一个包含所有特征的矩形区域，利用Harris算子在该区域检测出角点，并找出这些点的局部最大值点；最后用Kmeans方法对这些点进行聚类。

Based on site projection operator,a systematic method is proposed to factorize the single-particle π Hamiltonian into irreducible representations of the maximal symmetry of the molecule.

基于位置投影算子，提出了一个系统的方法，用来按照分子的最大对称群，彻底地分解π电子共轭体系的哈密顿。

Dr George Fieldman, a psychologist at Buckingham Chilterns University College who specialises in research into ***ual attraction, said: It's certainly true that people look for symmetry in a mate.

白金汉郡切尔登大学学院的心理学博士乔治·费尔德曼对性吸引力做了专门研究，他说：人们在择偶时确实会把身体的平衡度作为一个标准。

Dr George Fieldman, a psychologist at Buckingham Chilterns University College who specialises in research into sexual attraction, said: It's certainly true that people look for symmetry in a mate.

白金汉郡切尔登大学学院的心理学博士乔治·费尔德曼对性吸引力做了专门研究，他说："人们在择偶时确实会把身体的平衡度作为一个标准。"

Now she was hungry and angry.She began to smoulder.

现在她又饿又气，她开始流露难以抑制的怒火。

You have placed our iniquities before You, Our secret sins in the light of Your presence.

诗90：8 你将我们的罪孽摆在你面前、将我们的隐恶摆在你面光之中。