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Sample entropy (SampEn) and intrinsic mode entropy (IMEn) are used to evaluate the fluctuation characteristics in a novel circulating jet tank (CJT). SampEn analysis indicates that the fluctuation complexity of intrinsic mode functions (IMF) reaches a maximum in the first scale and then decreases with the increase of the decomposed scales. When the frequency bands are less than 36.25 Hz, the fluctuation...
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