TY JOUR TI IMPROVING THE ENVIRONMENTAL PERFORMANCE OF DIESEL ENGINES IN TRACTOR VEHICLES KW harmful emissions KW cooling KW supercharged air KW diesel engine KW exhaust gases KW catalytic converter JO Problems of risk management in the technosphere AU Melbert, A.A. AU Mashenskaya, E.A. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia