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Melt index (MI) is one of the most important quality variables determining the product's grade and quality control in practical propylene polymerization process. In this paper, the MI series is proved to be chaotic, where its Hurst index is calculated to be 0.9391, and the maximum Lyapunov exponent is 0.1560. Then, the phase space of the MI series is reconstructed through Cao's method based on the...
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