D.V. Ivanov1, V.A. Ivanov2, N.V. Ryabova3, V.V. Ovchinnikov4

1-4 Volga State University of Technology (Yoshkar-Ola, Russia)

A.A. Galiev1, A.I. Sulimov2, A.V. Karpov3

1–3 Kazan Federal University (Kazan, Russia)

1 ggalievv@mail.ru; 2 asulimo@gmail.com; 3 arkadi.karpov@kpfu.ru