D.V. Ivanov1, V.A. Ivanov2, M.I. Ryabova3, V.V. Ovchinnikov4, N.A. Konkin5

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

1 IvanovDV@volgatech.net, 2 IvanovVA@volgatech.net, 3 RyabovaMI@volgatech.net, 4 OvchinnikovVV@volgatech.net, 5 KonkinNA@volgatech.net