Two novel spherical helical antennas are designed by projecting the planar equiangular spiral antenna onto the surfaces of hemisphere and partial sphere.
将平面等角螺旋天线投影到半球面和部分球面上，得到半球面螺旋天线和部分球面螺旋天线两种新型球面螺旋天线。
The spherical gradient refractive index micro-lens with small volume and short optical path can be easily shaped and conveniently adjusted, and has no spiral rays and low spherical aberration.
球对称梯度折射率微球透镜具有体积小、光路短、外形易加工、使用易调整，且无螺旋光线、像差小等优越性能。
The spiral stairway is one of the main auxiliary equipments of large spherical vessels.
作为大型球形容器主要附属设备之一的盘梯，其最佳设计方案应该是等倾角上升的。
The spiral stairway is one of the main auxiliary equipments of large spherical vessels.
作为大型球形容器主要附属设备之一的盘梯，其最佳设计方案应该是等倾角上升的。
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