查询词典 symmetry

For a quantized subgroup of the symmetry group of Hamiltonian of a molecule,a site projection operator is defined to produce symmetry-adapted wave functions from the functions with the symmetry of the subgroup.

对于哈密顿的对称群的量子化子群，可以定义一个位置投影算子，来从具有该子群对称性的轨道产生完全的对称性匹配轨道。

Secondly,the condition under which the Noether symmetry is a Lie symmetry is obtained.Finally,a generalization of Hojman theorem is given and two examples are given to illustrate the application of the result. analytical mechanics ; holonomic system ; symmetry ; conserved quantity

新近出现的形式不变性理论也取得进展[6～8]，文献[9]研究了完整力学系统由Lie对称性导致的Hojman守恒量，本文继文献[9]，研究完整力学系统由Noether对称性导致的Hojman守恒量。1 系统的Noether对称性与守恒量完整力学系统的运动微分方程为 Es=Qs (s=1，…，n)(1)其

Of arbitrary isogon of arbitrary linear symmetry transformation , breaking the former only for a fixed linear symmetry transformation , eliminating the symmetry of the fixed line every time when the importation of trouble

详细说明：这是关于任意正多边形关于任意直线的对称变换，打破了以前的只能对于一个固定的直线的对称变换，省去了关于固定直线对称时每次都要输入的麻烦

The fermionic fields rotate oppositely according to κ symmetry. The symmetry of the twisted dual is the symmetry of the moduli space.

这种对偶变换的对称性不是超弦作用量的对称性，它是解的模空间的对称性。

The medium term and the long term cycles of datum plane are made of symmetry structures by the two half cycles of rising and falling, and the short term cycle of datum plane are divided into two basic types of symmetry and non symmetry.

中、长期基准面旋回由上升、下降2个半旋回构成对称型结构，短期基准面旋回分为对称型和非对称型结构。

Based on a comprehensive study of drilling and log data, sequences of short-term base-level cycle of turbidite fan in Yanchang Formation of Triassic in Longdong area are divided into three basic structure types: up - deepening non - symmetry, up -shallowing non ?symmetry and symmetry ones according to recognition sign of the interface of the short - term base - level cycle.

以高分辨率层序地层学理论和技术方法为指导，以钻井、测井资料的综合研究为基础，运用短期基准面旋回界面的识别标志将陇东地区三叠系延长组浊积扇短期基准面旋回层序划分为向上"变深"非对称型、向上"变浅"非对称型和对称型3种基本结构类型。

In chapter 4, we compute the symmetry group, variational symmetry group, divergence symmetry group of some operator equation.

在第四章中计算了一些偏微分算子方程的对称群，变分对称群以及散度对称群。

This can be done using computer vision technique and from symmetry property of potteries. The problem of recovering the 3D shape of a surface of revolution from images is addressed. The algorithm makes use of the symmetry properties of a surface of revolution and its silhouette to rectify the image such that the resulting silhouette exhibits bilateral symmetry.

在该方法的实现过程中，首先利用旋转平台获取了旋转体的影像，然后基于物方的空间圆重建方法精确测量旋转体的上口，从而得到旋转体的旋转轴，再根据影像的方位元素对影像进行纠正，使得旋转体的轮廓线在影像上的成像左右对称，最后直接用纠正后的影像精确计算旋转体的形状。

First, the color-image was preprocessed with grayscaling, smoothing. The vertical gradient components of the image were found using the vertical mask of Sobel operator. Then the candidate areas with sufficient amount of edges were determined by calculating the gradient of edges. After finding possible vehicle candidates, the proposed method measured the prominent vertical symmetry of candidate areas and verified all possible candidates, as symmetry is an important feature of vehicle. The proposed method also figured out the vertical axis of symmetry and the width of the candidate vehicle.

算法首先对图像进行灰度化、平滑去噪等预处理，使用Sobel算子垂直方向掩模计算图像感兴趣区域内的边缘梯度，确定候选区域；而后根据车辆图像垂直边缘具有对称性的特点，分析候选区域的对称性强弱，并计算其对称轴位置和车辆宽度。

Based on a comprehensive study of drilling and log data, sequences of short-term base-level cycle of turbidite fan in Yanchang Formation of Triassic in Longdong area are divided into three basic structure types: up - deepening non - symmetry, up -shallowing non ?symmetry and symmetry ones according to recognition sign of the interface of the short - term base - level cycle.

以高分辨率层序地层学理论和技术方法为指导，以钻井、测井资料的综合研究为基础，运用短期基准面旋回界面的识别标志将陇东地区三叠系延长组浊积扇短期基准面旋回层序划分为向上&变深&非对称型、向上&变浅&非对称型和对称型3种基本结构类型。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。