right circular cone

The experimental research on high narrow draft tubes with several different conical tube height has been made.

论述了窄高型尾水管配用不同高度直锥管的试验研究成果，对直锥管的有利高度进行了有益的探讨。

To improve the relatively great loss of normal Y branch optical splitter,the straight tapered waveguide instead of traditional straight waveguide is adopted to minish the size of components,and a new low-loss 1×3 optical splitter of three cascaded branches is used.

针对传统Y分支光分路器损耗较大的缺陷,采用直锥形波导代替传统的直波导来减小器件的尺寸,并且采用激模波导结构设计1×3分支波导。