TY JOUR TI RESEARCH OF PNEUMATIC SEPARATOR FOR FRACTIONAL SEPARATION AND CLEANING OF GRAIN KW grain heap KW pneumatic gravity separator KW air flow JO Vestnik of Omsk SAU AU BEGUNOV, M.A. AU KOROSTELEV, D.N. AU BEGUNOV, M.A. AU KOROSTELEV, D.N. PY 2025 IS 58 PB FSBEI HE Omsk SAU