Based on the features of existing structure, the nonstationary random process model of resistance for existing structure is proposed.
根据服役结构的特点，提出了服役结构抗力的非平稳随机过程模型。
The second nonstationary random process mathematical model, which is based on data, is the a modification to the first nonstationary random process mathematical model.
基于数据的第二种非平稳随机过程数学模型是第一种非平稳随机过程数学模型的继续。
The Doppler blood flow signal is inherently a nonstationary Gaussian random process whose time-frequency representation associates with the time-varying velocity of blood flow and its variations.
多普勒超声血流信号是一个非平稳的高斯随机过程，其时频分布与血流的速度及其变化有密切的关系。
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