TY JOUR TI IMPROVING ENVIRONMENTAL SAFETY OF DIESEL ENGINES BY CHANGING FUEL INJECTION DURATION KW environmental safety KW diesel engine KW exhaust gases KW injection duration KW fuel 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