Ch.Z. Nguyen¹, S.A. Alikov²,  A.G. Shein³, D.G. Kovtun4, E.M. Ilyin5

1-4 Volgograd State Technical University (Volgograd, Russia)

5 Moscow State Technical University. N.E. Bauman (Moscow, Russia)

Chong-Zu Nguyen1, D.G. Kovtun2

1,2 Volgograd State Technical University (Volgograd, Russia)

2 kdmob74@gmail.com