查询词典 plane symmetry

Firstly, we calculate the Lie point symmetry of 1+2-dimensional nonlinear evolution equation:Which arises from the motion of plane curves in affine geometry.

我们首先计算了来自射影几何的平面曲线运动的非线性发展方程：所容许的李点对称群。

Due to the symmetry of the plate, there are symmetric and antisymmetric mode vibrations with respect to the median plane of the plate.

首先建立了在偏压电场作用下压电介质的运动微分方程，进而根据对称模态和反对称模态的特点，分别在自由表面电学开路和电学短路情况下得到了Lamb波传播的相速度方程。

The theory and method of simulating axial symmetry field by plane resistance net-work are intreduced in this paper.

本文介绍了利用平面电阻网格模拟轴对称场的原理和方法，这种方法与目前采用的电解槽法相比，具有测试方法简便、重复性好等优点。

Porous media, as well as the axial symmetry plane seepage flow calculation.

详细说明：孔隙介质中的轴对称渗流以及平面渗流计算方法。

On the axis of symmetry on certain distance from geometric center of the surface, depending on the position of the cropping plane.

当抛物面切割面垂直于对称轴，就得到一个圆形的抛物面，它的焦点位于正中央，即对称轴上距离抛物面几何中心一定距离的地方，。

Where the left hand term in the equation represents the integral of the pressure forces acting on the chamber and nozzle, projected on a plane normal to the nozzle axis of symmetry, as shown in the figure.

而左手的任期在方程代表积分的压力势力对总商会及喷嘴，预计对飞机正常的喷嘴轴线对称，显示在数字。

If a cut plane goes through an axis or a symmetry line of standard components, they can be drawn as if they were not cut away.

当剖切平面通过标准产品的轴线或对称中心线时，可按不剖画出其外形。

Firstly, enhanced bit- plane entropy is introduced to avoid the influence of the symmetry of entropy.

该算法采用改进的位平面熵来消除熵的对称性对检索效果造成的影响。

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 diffraction theory of Kirchhoff is applied to the four-pinhole aperture diffraction screens, the intensity, the zero-contour of the real and imaginary parts of complex amplitude and the phase distribution in deep Fresnel diffraction region are simulated, and it is found that the bright spots in interference field show central symmetry distribution. When the observation plane close to the diffraction screen, the zero-value points of light intensity can form line segment, on which the eccentricities of the light intensity isoline are close or equal to 1, the intensity changes very fast on both sides of the zero-line of light intensity.

利用基尔霍夫衍射理论计算了四圆孔径衍射屏在菲涅尔深区形成的的干涉光场的强度、零值线和相位的分布，发现干涉光场亮斑关于中心呈对称分布，在距离衍射屏较近的观察面上，光强值为的零点组成光强零值线段，该线段上光强等值线的离心率都接近或等于1，其两侧的光强值变化非常剧烈。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。