time stationary process

T-F analysis method is an important ramification of non-stationary signal processing. It employs the joint function of time and frequency to represent, analyze and process the non-stationary signal.

T-F分析方法是非平稳信号处理的一个重要分支，它是利用时间和频率的联合函数来表示非平稳信号，并对其进行分析和处理。

Test shows that the proposed method is robust and the detection performance holds good results even if the background noise is a slowly time varying non stationary process.

实验结果表明，即使背景噪声具有缓变特性，利用该方法仍可得到良好的检测结果。

Especially, modern spectral estimation is not only of high resolution, but also able to process non stationary time series, so it is widely used.

特别是现代谱估计方法，既有高分辨率，又可以分析非平稳时间序列，具有广泛的应用。

Useful information about the kinetic features and the mechanism of catalytic reaction, which cannot be provided by stationary experiment, can be obtained from dynamic experiment, because the concentration of adsorbed species on the catalyst surface varies with time in dynamic process.

在动态过程中，由于表面上吸附物种的浓度随时间而变化，因此有可能提供稳态流动法不可能获得的信息。