TY JOUR TI EXPERIMENTAL STUDY ON CARBON RESIDUE ELECTRICAL RESISTANCE OF PVC POLYMERIC MATERIALS KW carbon residue KW PVC KW electrical resistance KW experimental research JO Problems of risk management in the technosphere AU Berov, K.K. AU Belshina, J.N. AU Sharapov, S.V. PY 2013 IS 2013 PB Saint-Petersburg University of State Fire Service of Emercom of Russia