proper quadric

There is the term of “real 2000 Dan”in the historical materials of Han dynasty.

汉代史料有“真二千石”之名目,注释家如淳、颜师古、司马贞等及若干当代学者皆以为汉官秩有“真二千石”之秩级。

This paper introduces the specific establishment process of a quasi-2D control field and a transformation and its mathematic model from the quasi-2D control field to a virtual real-2D field.

介绍了建立准二维控制场的详细过程和准二维控制场至虚拟真二维控制场的变换及其数学模型,分 析了摄站点坐标误差对此变换的影响,提出了建立数字畸变模型和使用此模型对像点各类畸变进行总体改 正的新理论。

The relations among real efficient secondary electron emission coefficient at high energy,the incident angle of primary electron and depth;

高能有效真二次电子发射系数与逸出深度和入射角的关系

This paper discusses the relation of energy power of higher energy range primary electrons which belong to the same energy band and primary electron energy and real efficient secondary electron emission coefficient in metal in theory.

论述了某一个能区入射电子对金属平均射程的能量幂次与入射能量、金属的有效真二次电子发射系数的关系,并简化推导了表达式。