A.D. Nikitin - Post-graduate Student, Department of Physics, MATI - Russian State Technological University. E-mail: nikitin_alex@bk.ru I.S. Nikitin - Dr. Sc. (Phys.-Math.), Professor, Department of Physics, MATI - Russian State Technological University; Leading Research Scientist, Institute of Computer Aided Design of the Russian Academy of Sciences (ICAD RAS). E-mail: i_nikitin@list.ru