TY CONF TI EVALUATION OF SANY SY245F CRAWLER EXCAVATOR HARVESTER OPERATION IN SUMMER AND WINTER TEMPERATURE CONDITIONS KW harvester based on crawler excavator KW efficiency KW productivity KW winter and summer temperature conditions JO OPERATOR EQUATIONS AND SOME RELATED ISSUES IN APPLIED MATHEMATICS AU Pautov, D.A. AU Kuznetsov, A.V. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov