In this paper, the basic properties, behavior of residual microcrystal in industry glutamic acid mother liquid, especially secondary extraction of glutamic acid which is the key technology of“Glutamic acid extraction of non-waste process with double crystallization”are studied.

Virtual Experimental Design of the Quadratic Surface Base on Computer;

Determine line of intersection of quadratic surface revolution and surface of revolution;

The circle line of several kinds of common quadratic surfaces;

Research on free-form surface reconstruction based on quadric surface and self-organized system;

Auto Drawing of quadric surface and its length calculation;

The study on circle section of quadric surface by the characteristic root;

The cross iteration method on the intersection of two conicoids in CAD/CAM system;

Study on resolving anaberrational points of conicoid;

We use least squre method to form conicoid mathematic model and fit the point cloud which has been grouped by octree subdivision method.

Inner point and exterior point of a quadric and its plane of the type of contact plane;

The article gives a way by which a quadratic curve is processed by a linkage,and then a quadric can be formed by revolving the quadratic curve as a generatrix around the axis.