By the theory of ray optics, the bend losses of fiber as function of fiber parameters such as core index, cladding index, core radius and bend radius are set up.
利用光线理论研究光纤弯曲损耗与弯曲半径、纤芯折射中以及包层折射率的关系。
Tube bending is a process by which a straight piece of tube is formed to a selected radius and angle of bend.
弯管工艺是指将平直的管子按选定的半径和弯曲角度弯曲成形。
Secondly, different changes in river programs, it's outside of river bend shows erosion status in different flood frequencies. And the localscour depth is different with different bend radius.
不同改河方案在不同洪水频率下河流弯道外侧呈现出冲刷状态，而内侧则呈现淤积状态，并且弯道半径不同，局部冲刷深度也不同；
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