In the paper aiming at the problem of low frequency noise transmission through double panel structure, feedback active noise control technique is adopted to control noise transmission.
本文对于低频噪声在双层板结构中传播的问题，探讨采用反馈的主动噪声控制技术以达到控制噪声传播的目的。
Proton NMR two dimensional time-domain data are collected based on the inversion-recovery technique. Double Fourier transformation of those data yields the two dimensional frequency-domain data.
基于反转恢复法建立质子nmr二维时域数据，经双重付里叶变换获得二维频域数据。
Proton NMR two dimensional time-domain data are collected based on the inversion-recovery technique. Double Fourier transformation of those data yields the two dimensional frequency-domain data.
基于反转恢复法建立质子nmr二维时域数据，经双重付里叶变换获得二维频域数据。
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