TY JOUR TI Average speed of gravity of motion particles in the bed KW speed KW acceleration KW a particle layer separation. JO Actual directions of scientific researches of the XXI century: theory and practice AU Bykov, V.. AU Kutishchev, D.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov