D.V. Ivanov1, V.A. Ivanov2, N.V. Ryabova3, Yu.A. Vedernikova4, A.A. Chernov5

1-5 Volga State University of Technology (Yoshkar-Ola, Russia)

1 IvanovDV@volgatech.net; 2 IvanovVA@volgatech.net; 3 RyabovaNV@volgatech.net; 4 VedernikovaYA@volgatech.net; 5 ChernovAA@volgatech.net