center of sphere

On the Graphic Method That Proves the Theorem About the Locus of the Center of the Sphere Tangent to Two Skew Lines in General Position

关于与两交错直线等距离的点的轨迹的图解定理

Deformations of the sphere include elastic-plastic deformation and full plastic deformation . The plastic deformation first appeared in the center of the sphere and the suddenly formation of cavit was found .

球体的变形可分为弹-塑性变形阶段和完全塑性变形阶段，球体中心首先形成塑性变形区域，并有空穴的突然生成；

Determine : the center of the smallest sphere which is tangent to four non-parallel unlimited skew lines in general positions

求与空间四条异面直线相切的球中最小的球

Research on the nature of the conjugate image of the point on the major axis at a distance from the center of a large-aperture sphere mirror

大孔径球面镜轴外点的共轭象性质研究环状复球面镜谐振腔的衍射积分方程

From analytical expressions and calculating results we can observe that there is concentration of the dynamic stress at the center of a solid sphere and periodical oscillation due to the continual reflection of stress wave at the external boundary of the solid sphere .

从热动应力的解析表达式和计算结果可以发现圆心处的动应力具有动应力集中现象，并且随着应力波在球体外边界的不断反射而产生周期性振荡。

In order to explain the densities of haphazard packing of sphers , the author proposed a mathematical model . In the model there is an envelope sphere of radius 2R with a center at the center of core sphere of radius R.

为了对球体任意堆积的密度作出理论的解析，作者提出，以核心球中心为中心，2R为半径，作一个包裹球的数学模型。

There exist three possible stationary motions of the sphere . The permanent rotations about its symmetric axis with the center of mass , lower or higher the center of sphere , and the regular precession with a definite nutation angle .

分析表明，刚球存在三种可能的稳态运动，即质心低于或高于球心绕对称轴作永久转动，或以某个确定章动角作规则进动。

A straight line connecting the center of a circle with two points on its perimeter ( or the center of a sphere with two points on its surface ) .

两个尖端在圆的周界上并且连接中心的直线（或尖端在球体表面上连接球中心）。

While the center changing spherical method may be employed in solving the intersecting lines of quadratic surface of non revolution and annular torus ( quartic surface ), the conventional method is incompetent in determining the center of the center changing sphere .

对于二次非回转曲面体与圆环（四次曲面体）的相贯线求解，可以采用变心球面法，但用常规方法无法求出变心球的球心。