A.G. Shein - Dr.Sc. (Phys.-Math.), Professor, Department of Physics, Volgograd State Technical University E-mail: professor39@mail.ru D.A. Baryshev - Ph.D. (Phys.-Math.), Department of Physics, Volgograd State Technical University E-mail: graf.d@bk.ru D.I. Stepanenko - Post-graduate Student, Department of Physics, Volgograd State Technical University E-mail: di-stepanenko@yandex.ru