对称中心

NONE A continent lying chiefly within the Antarctic Circle and asymmetrically centered on the South Pole.

南极洲：主要位于南极圈内，以南极为不对称中心的大陆。

A continent lying chiefly within the Antarctic Circle and asymmetrically centered on the South Pole.

南极洲：主要位于南极圈内，以南极为不对称中心的大陆。

By this device, we can determine the symmetry center of the parts and then locate the parts.

通过设计特定的辅助装置，确定零件的对称中心，并将其定位。

The same holds true for any molecule with a center of symmetry .

对任何有对称中心的分子同样是对的。

If the screwed fastening piece and solid piece are longitudinally sectioned and the cut plane goes through the center of symmetry, these parts are represented as though they were not sectioned.

对于螺纹紧固件及实心件若按纵向剖切且剖切平面通过其对称中心时，这些零件按不剖画出。

The symcenter of conoscopic interference pattern is corresponding to vertical incident light and crystal birefractive index is proportional to interference order m. Decimal fraction of interference order m is calculated by the placement of central dark fringe and integer part is ascertained by self-consistent method.

干涉图的对称中心对应于正入射光线，双折射率正比于此点的干涉级m，m的小数部分主要由中央暗条纹的位置决定，m的整数部分由自洽的办法求出。

Based on the model of DLA, this paper simulates the process of aggregation's growth for random walk particles from local area on two-dimension Euclidean plane. The aggregation is confined to Euclidean circular plane for large enough particle walking area and far enough partial source distance. The centre of the Euclidean circular plane is on the line between the particle source's symmetric centre and the seed particle, and is more closer to the particle source than the seed particle. Though the rate of aggregation growth is different in different directions, the whole aggregation shows fractal structure.

以DLA模型为基础，模拟研究了在二维欧几里德平面上由局部区域内产生随机运动粒子的聚集生长过程，发现对于足够大的粒子运动区域和足够远的粒子源距离，凝聚集团大体上被限制在欧氏圆形面内，圆心在粒子源对称中心和种粒子的连线上，且比种粒子更加接近粒子源；凝聚集团朝各个方向的平均生长速率虽然不同，但整体仍呈分形结构。

In chapter 3,we dig out two families of invariant quartic curves of a quadratic system.

第五章讨论向量场具有对称中心的二次系统，利用系统的不变双曲线及不变四次曲线，我们确定了一个对应极限环（1.1）分布的二维参数区域，其边界的构成为如下几种常见的极限环分枝：霍夫分析，庞加莱分枝，同宿分枝和异宿分枝。

The scheme is directly obtained by the time integration of the fluid flows. The new contribution of this part is to show analytically that the singularity is removable and the momentum vanishes at the center.

本部分的主要贡献在于理论上证明了对称中心处流体的速度为零以及源项奇异性的可去性。

The disorder of the thienyl ring and〓 groups in 11, 12 and the disorder of water in the packing of 14 may be responsible for their triboluminescent activities.Ⅲ. A dinuclear triboluminescent complex,〓(15)(where TTA=2- thenoyltrifluoroacetone, PyO=N-oxide pyridine), was synthesised and its crystal structure and triboluminescence spectrum were determined.

X-射线结构分析表明，四个配合物中的铕原子均呈现出八配位的四方反锥几何构型。11、12及13均为有对称中心结构配合物，11、12中的噻吩环及〓的无序以及配合物14晶胞中水分子的无序可能对它们的摩擦发光活性起了很重要的作用。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。