Index ellipsoid

The optic axial angle of biaxial crystal is calculated by coordinate transforming the index ellipsoid equation x~2/n_1~2+y~2/n_2~2+z~2/n_3~2=1 from the principal dielectric coordinate system to another new coordinate system.

通过坐标变换把折射率椭球方程x~2/n_1~2+y~2/n_2~2+z~2/n_3~2=1从主介电坐标系Oxyz转换到另一个新的坐标系Ox′y′z′中,这个新的坐标系Ox′y′z′可以通过将坐标系Oxyz绕原点旋转得到。

In this paper, the direction of the palaeostructural stress field of the Baisha syncline is determined by computing the reflectance ellipsoid of vitrinite in the coal samples, and it is found that it has no relations with the metamorphic zoning of coal.

对耒阳—临武经向构造带内的白沙含煤向斜用计算机计算镜质组反射率椭球确定了古构造应力场方向,发现其与煤变质分带没有联系。

Propagation constants in a nonlinear weakly-guiding elliptic graded-index fiber;

非线性弱导椭圆梯度折射率光纤的传播常数