B.E. Zhelezovsky - Dr.Sc. (Phys.-Math.), Professor, Head of the Department of Physics and Methodical and Information Technologies, Physics Faculty, Saratov State University n.a. N.G. Chernyshevsky. E-mail: kafedrafimit@yandex.ru E.V. Kalyanov - Ph.D. (Phys.-Math.). E-mail: ervask@mail.ru