3) Wang-Said type generalized Ball basis
Wang-Said型广义Ball基
5) generalized Ball curve
广义Ball曲线
1.
G~2 Beta constraint of generalized Ball curves
组合广义Ball曲线的G~2Beta约束
2.
As a kind of generalized Ball curves, Wang Ball curves have shown greatly efficient effects on evaluating parametric curves, degree elevation and degree reduction.
Wang Ball曲线作为一种广义Ball曲线已经在参数曲线求值、升降阶计算中显示出极其有效的作用 。
3.
Enveloping theorems of B e zier and B-spline curves have been developed by su[4], In this paper,euveloping theorem of generalized Ball curve will be discussed .
Bzier曲线和B样条曲线的包络性质已在[4]中讨论过,本文研究广义Ball曲线的包络性质。
6) generalized Ball surface
广义Ball曲面
补充资料:ball valve
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CAS号:
性质:又称球心旋塞,球心阀。是旋塞阀的变形,启闭件(球形栓塞)绕垂直于通路的轴线旋转的阀门。阀门体内装有球体栓塞,栓塞中开有圆形通道,与旋塞比较,除旋塞之优点外,它可用于压力或温度较高而口径较大的管路。
CAS号:
性质:又称球心旋塞,球心阀。是旋塞阀的变形,启闭件(球形栓塞)绕垂直于通路的轴线旋转的阀门。阀门体内装有球体栓塞,栓塞中开有圆形通道,与旋塞比较,除旋塞之优点外,它可用于压力或温度较高而口径较大的管路。
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