@article{meng_liu_yu_wu_2012,  title={Time-frequency analysis of Hilbert spectrum of pressure fluctuation time series in a Kenics Static Mixer based on empirical mode decomposition},  volume={29},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322012000100018},  DOI={10.1590/S0104-66322012000100018},  number={1},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Meng, Huibo and Liu, Zhiqiang and Yu, Yanfang and Wu, Jianhua},  year={2012},  month={Jan},  pages={167–182} }