S. G. Aliushina, P. E. Denisenko, O. G. Morozov, I. R. Sadykov, O. A. Stepuschenko

A.V. Ermolaev - Ph. D. (Phys.-Math.), Volgograd State Technical University. E-mail: magnetton@rambler.ru
O.A. Olennikova - Undergraduate, Department «Physics», Volgograd State Technical University. E-mail: kovolum@yandex.ru
A.G. Shein - Dr. Sc. (Phys.-Math.), Professor, Department «Physics», Volgograd State Technical. University. E-mail: professor@mail.ru
I.V. Polyakov - Ph. D. (Phys.-Math.), Associate Professor, Department «Physics», Volgograd State Technical University. E-mail: liichkap@mail.ru