TY JOUR TI DEVELOPMENT OF A MODULAR FOAM GENERATOR WITH ADJUSTABLE PARAMETERS KW foam generator KW foam ratio KW fire extinguishing KW flammable liquids KW modular design KW 3D-printing KW dispersing elements JO Problems of risk management in the technosphere AU Khafizov, I.F. AU Popova, E.V. AU Safargalin, A.R. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia