TY JOUR TI LUMINESCENCE PROPERTIES OF GROUND FEED GRAIN WITH VARYING FAT CONTENT KW photoluminescence KW grain fat concentration KW wheat KW oats KW barley KW emission spectrum KW photoluminescence flux KW statistical parameters JO Bulletin of KSAU AU Belyakov, M.V. AU Pyatchenkov, D.S. PY 2025 IS 0 PB Krasnoyarsk State Agrarian University