Phase-matched filter is applied to extract phase of fundamental surface wave, and then time-variable filter is used to correct amplitude spectrum in order to isolate fundamental mode signs.

使用相匹配滤波技术提取基阶面波振型的相位，然后再利用时变滤波进行振幅谱校正，以此分离出基阶振型面波信号。

youdao

The term numbers of free energy expansion are studied during the phase transition process when the order parameter is more than one variable.

本文讨论了序参量是多变数情况下相变过程中自由能展开式应保留的项数。

youdao