The method for calculating the equal-section equivalent beam width is presented and the stiffness of the equivalent beam equals to the slab stiffness.
同时按刚度相等原则，给出了折算成等截面等代梁宽度的计算方法。
The mean-square width and the equivalent-beam width are put forward to investigate the spreading of vortex beam while propagating.
提出了均方根光斑尺寸以及等效光斑尺寸的定义，并分别采用这两种定义对涡旋光束的光斑展宽进行了分析。
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