A.K. Alimuradov1, A.Yu. Tychkov2, M.I. Yuskaev3, D.S. Dudnikov4, M.A. Tyurin5, P.P. Churakov6, Z.M. Yuldashev7

1–6 Penza State University (Penza, Russia)

7 St. Petersburg State Electrotechnical University "LETI" (Saint Petersburg, Russia)