TY JOUR TI ASSESSMENT OF THE POSSIBILITY OF FIRE EXTINGUISHING BY SANITARY MEANS OF THE UNITS CIVIL DEFENSE OF EMERCOM OF RUSSIA KW fire extinguishing KW SF-2U KW sulfonol KW penetrating ability KW foaming agent JO Problems of risk management in the technosphere AU Meshcheryakov, I.V. AU Alekseik, E.B. PY 2025 IS 2025 PB Saint-Petersburg University of State Fire Service of Emercom of Russia