宇宙基本常数，比如电磁力强度之类的精细结构常数，符号位“alpha ”，它们因为被假定为不变量而得名。
Fundamental constants such as the strength of the electromagnetic force - the so-called fine-structure constant, or alpha - get their name from the fact that they are supposedly the same everywhere.
但理论研究表明，只有特定的几何约束结构，才具有射影不变量。
However, researches show that only some special geometric constrained structures possess projective invariants.
该标架系统可建立两条同源曲线几何不变量之间的解析关系，用于变形过程几何结构改变的分析。
The frame with its formula can set up analytic relationships among the geometric invariants of two homologous curves, and can be used to analyze the deformation process of geometric structures.
实验验证了文中提出的几何约束结构具有不随物体成像视点改变的射影不变量。
The experimental results show that the proposed structure has projective invariant which does not change with the variation of the viewpoints.
介绍了湍流不变量图在圆管湍流研究中的应用，分析了离壁距离和雷诺数对管流湍流结构的影响。
The anisotropy invariant map was also introduced briefly. The effect of the distance away from the wall and the Reynolds number on the turbulence structure in a pipe flow was also analysed.
图像的微分结构信息是图像结构的一种重要表示方法，可用微分不变量进行描述。
The image differential structure information, which can be described by using the differential invariants, is an important method to characterize the image structure information.
图像的微分结构信息是图像结构的一种重要表示方法，可用微分不变量进行描述。
The image differential structure information, which can be described by using the differential invariants, is an important method to characterize the image structure information.
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