By Fourier transform, we make an particular calculation on the formula of the multiple of the stretcher, and gain an integrity calculate formula.

采用傅立叶变换，对展宽倍数公式进行了详细的推导，得到一套完整的计算公式。

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On the assumption that the hydraulic conductivity field follows a lognormal distribution, the direct Fourier transform is introduced to generate multiple realizations of hydraulic conductivity field.

据以往研究，假设渗透系数场遵循对数正态分布，利用直接傅立叶变换方法来生成渗透系数随机场。

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The theory of multiple input-output frequency response functions estimation is studied based on the finite Fourier transform.

以有限富氏变换为基础，研究多输入-多输出频响函数估计的一般原理。

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