TY JOUR TI THEORETICAL JUSTIFICATION OF THE MINIMUM DROP HEIGHT OF A SPHERICAL GRAIN INTO THE DEVELOPER SOLUTION KW grain material KW grain cleaning machine KW Archimedes force KW surface tension KW spherical grain JO Vestnik of Kazan State Agrarian University AU Sysuev, V.A. AU Saitov, V.E. AU Farafonov, V.G. AU Saitov, A.V. AU Malyh, T.V. PY 2020 IS 15 PB Kazan state agrarian University