N.P. Petrov1, S.N. Petrova2, N. V. Korzhavina3, E. V. Lisovsky4
1 Cheboksary Institute (branch) Moscow Polytechnic University (Cheboksary, Russia)
2,3 Technical University of the Ural Mining and Metallurgical Company (Verkhnyaya Pyshma, Russia)
3 Ural State Low University (Ekaterinburg, Russia)
2 Technical University of the Ural Mining and Metallurgical Company (Verkhnyaya Pyshma, Russia)
4 Kaluga branch of the Bauman Moscow State Technical University (Moscow, Russia)