E.S. Yanov1, A.V. Antsev2, M.S. Vorotilin3, E.I. Minakov4, S.V. Prokopchina5

1 JSC NPO «SPLAV named after. A.N. Ganichev» (Tula, Russia)

2–4 Tula State University (Tula, Russia)

5 Financial University under Government of Russian Federation (Moscow, Russia)

1dexaik@mail.ru