TY JOUR TI COMPARISON OF DIFFERENT SYSTEMS FOR CALIBRATION OF THE HEAT FLUX METERS KW thermal flux KW radiation KW heat flux gauges KW heat flux measurement KW calibrating KW black body KW radiometer JO Problems of risk management in the technosphere AU Sharkov, A.V. AU Korablev, V.A. AU Nekrasov, A.S. PY 2015 IS 2015 PB Saint-Petersburg University of State Fire Service of Emercom of Russia