TY JOUR TI INCREASING THE LEVEL OF SAFETY OF PERSONNEL DURINGTHE WORK, CALCULATIONS OF THE PARAMETERS IN THE MEANS OF INDIVIDUAL PROTECTION OF RESPIRATORY ORGANS KW security KW calculations of parameters for the means of individual protection of respiratory organs and sight KW a rescue device JO Problems of risk management in the technosphere AU Karov, K.A. AU Kalanin, I.I. AU Andrianov, R.S. PY 2017 IS 2017 PB Saint-Petersburg University of State Fire Service of Emercom of Russia