The expression of a tangent cone family with one parameter about a quadric surface is discussed.
讨论了二阶曲面的单参数切锥族的表示方法,导出了单参数切锥族的包络面的方程。
The intersection of hyper-quadric surfaces,or linear subspace and hyperquadric surfaces,can be solved easily by quadrictransformations
利用平方变换可以使每一类超二阶曲面和线性子空间，以及超二阶曲面之间的定位问题的解法得以简化。
The paper showed the configurational properties of the Klein s representation in PG (5,q) of the regulus and regular spread of PG (3,q ) { (q≥5) is a odd integer}.
ｑ）（ｑ≥＝５是奇数）的半二阶曲面和正则展形在ＰＧ（５。
New Forms of Differential Geometry of Second Order Surface and Their Application to Gear Drive;
二阶曲面微分几何新形式及在齿轮传动中的应用
The Simplification Problem About Equtionof Curve of Order 2 on Projective Plane;
射影平面上二阶曲线方程的化简问题
Several Methods to Solve Asymptotic Line of Curve of Second Order on the Projective Plane;
射影平面上二阶曲线渐近线的几种求法
Feature Extraction of Sectional Curve in Reverse Engineering Based on Two Orders Discrete Curvature
基于二阶离散曲率的截面线特征提取算法
The Hypersurfaces in Unite Sphere with Semi-parallel and 2-order Parallel Mbius Second Fundamental Form;
球面中具有半平行和二阶平行Mbius第二基本形式的超曲面
tangent-cone of a qualric
二次曲面的切线锥面
conjugate diametral plane
共轭径面 -二次曲面的
conjugate diametral planes of a quadric
二次曲面的共轭径面
Study and Application of C-Bézier Curves and Surfaces of Degree n;
高阶C-Bézier曲线曲面性质研究及其应用
Degree Reduction of the Said-Ball Curves and Surfaces;
Said-Ball曲线曲面的降阶逼近
Research on Approximate Degree Reduction for Interval Rational Bezier Curves and Surfaces;
区间有理Bezier曲线、曲面的降阶逼近研究
The Study of Degree Reduction Approximation Algorithm for Wang-ball Curves and Surfaces
Wang-ball曲线、曲面的降阶逼近算法的研究
We call this surface the stress quadric.
我们称这个曲面为应力二次曲面。
double generator of a ruled surface
直纹曲面的二重母线
second fundamental form of a surface
曲面的第二基本形式
conjugate lines in a quadric
二次曲面的共轭直线
bifocal chord of a quadric
二次曲面的两焦点弦
Exact Observability for Second Order Quasilinear Hyperbolic Equations
二阶拟线性双曲型方程的精确能观性