E.Yu. Agu - Post-graduate Student, Kaluga branch of the Bauman MSTU E-mail: liza.kornyushina@gmail.com A.V. Chelenko - Post-graduate Student, Kaluga branch of the Bauman MSTU E-mail: apererva@yandex.ru D.K. Nikiforov - Ph. D. (Phys.-Math.), Deputy Director, Kaluga branch of the Financial University under the Government of RF E-mail: dm_nikif@rambler.ru K.G. Nikiforov - Dr. Sc. (Phys.-Math.), Professor, Kaluga State University named after K.E. Tsiolkovsky E-mail: kgn@kspu.kaluga.ru