A.N. Yakimov1, A.R. Bestugin2, I.A. Kirshina3, O.P. Kurkova4

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

1 y_alder@mail.ru; 2 fresguap@mail.ru; 3 ikirshina@mail.ru; 4 aljaskaolga@mail.ru