V.N. Ruchkin1, B.V. Kostrov2, V.A. Fulin3, E.V. Ruchkina4

1, 3 Ryazan State University n. a. C.A. Esenin (Ryazan, Russia) 

2 Ryazan State Radio-Engineering University n. a. V.F. Utkin (Ryazan, Russia)

4 Ryazan State Agrotechnological University named after P. A. Kostychev (Ryazan, Russia)