N.R. Kazakova - Post-graduate Student, St. Petersburg University of State Fire Service of EMERCOM of Russia. E-mail: kazakova-nadenka@mail.ru A.K. Chernykh - Dr. Sc. (Eng.), Associate Professor, Professor, St. Petersburg Mmilitary Institute of Internal Troops of MIA of Russia. E-mail: nadezhda.m90@mail.ru