Determination methodology of the subsidence speed of small-dispersed particles of different ranges of storage facilities by visual recordingValeriy Azarov, Daniil Dobrinskiy, Vladislav Lupinogin and Anastasia SakharovaE3S Web Conf., 126 (2019) 00072DOI: https://doi.org/10.1051/e3sconf/201912600072