Following the principle and feature equations of the PSD, it is found that the output signal of PSD is nonlinear when there exists background light.
根据PSD的原理及特征方程，分析了存在背景光时psd输出信号是非线性的。
When there exists a free surface, jointed rock masses will behave highly nonlinear with large deformation.
在有临空面时，节理岩体将表现出显著的几何非线性和大变形。
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