TY JOUR TI DIAGNOSTICS OF EMISSION CHARACTERSTICS OF VEHICLES DIESEL ENGINES WHEN MONITORING THE TECHNICAL CONDITION UNDER UNSTEADY LOAD KW diesel engine KW diagnostics KW environmental performance KW greenhouse gas emissions KW speed mode KW correction coefficients JO Problems of risk management in the technosphere AU Savelyev, A.P. AU Shkrabak, V.S. AU Shkrabak, R.V. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia