TY JOUR TI KINEMATICS OF THE MOVEMENT OF SEPARATED GRAIN ON A FLAT SIEVE PERFORMING TRANSVERSE OSCILLATIONS KW flat sieve KW transverse vibrations KW motion kinematics KW differential equation KW separated grain JO Vestnik of Omsk SAU AU SABIEV, U.K. AU SHUMEL, I.I. PY 2026 IS 61 PB FSBEI HE Omsk SAU