E.R. Babicheva - Ph.D. (Phys.-Math.), Associate Professor, Admiral Ushakov Maritime State University G.V. Babicheva - Ph.D. (Phys.-Math.), Associate Professor, Admiral Ushakov Maritime State University. E-mail: 405092@mail.ru G.P. Sinjavskiy - D.Sc. (Phys.-Math.), Professor, Southern Federal University. E-mail: sinyavsky@sfedu.ru