Developed a feeding nozzle which have four double-feeding pipes with co-axial shaping gas distributes on circle orientation of laser beam with uniformity and symmetry.

研制了一种在以激光束为中心轴的圆周方向均匀对称分布四个具有同轴汇聚气的双层送粉管的送粉喷嘴。

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Besides, it was demonstrated that the (3, 9 + 2) -circle and (9 + 2, 3) -circle fractal sets are golden ones with symmetry breaking.

另外证实了(3,9 + 2)或(9 + 2,3)分圆分形花样是一个对称性破缺的黄金分形。

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