Modulation instability resulted from cross phase modulation(XPM) in decreasing dispersion fiber(DDF) is presented from nonlinear Schrodinger equation.

从非线性薛定谔方程出发得到了色散缓变光纤（DDF）中交叉相位调制（XPM）不稳定增益谱。

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Due to the multi modes and dispersion nature of acoustic emission (AE) propagating in pipeline, traditional cross correlation technique do not perform well for acoustic leak location.

由于泄漏声发射信号的多模态特性和在管道内传播过程中的频散特性，使得通过相关分析进行管道泄漏定位的效果很差。

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Indicates that the evenness of short-whiplash can he determined by analyzing the high dispersion of diameter and flatness of cross-section of raw silk.

认为短鞘丝匀度可根据生丝非常扁平、其直径离散性大等特征进行判知。

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