Wet shotcrete, including wet steel fiber shotcrete and wet plain shotcrete, has been adopted for the temporary and permanent lining of Qinling Railway Tunnel and good results have been obtained.
What's more, with the light power obviously intensifying and tunnel noticeably increasing, fiber nonlinearities have become a mainly important limitation imposing on systems.
但是，随着光纤中信道数的增多、光功率的增加，已使光纤非线性效应成为影响系统性能的主要因素。
3
Taking scalar wave equation and tunnel effect for example, the similarity of fiber optics to quantum mechanics was shown.