S.B. Makarov1, A.S. Nersisyan2, S.V. Volvenko3, H.G. Stepanyan4, A.K. Aharonyan5, V.H. Avetisyan6

1,3 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

2,4-6 Russian-Armenian University (Yerevan, Armenia)

1 makarov@cee.spbstu.ru; 2 anomonika@mail.ru; 3 svolvenko@spbstu.ru; 4 hrach8086@gmail.com; 5 aharon.aharonyan@rau.am; 6 avahan@mail.ru