S.A. Nenashev1, I.A. Kirshina2, T.A. Pisklenov3, V.A. Nenashev4

1–4 St. Petersburg State University of Aerospace Instrument Engineering (St. Petersburg, Russia)

1 nenashev_sergey178@mail.ru, 2 zlata@guap.ru, 3 tim.kirp@mail.ru, 4 nenashev.va@yandex.ru