E.S. Pavlov - Researcher, Kotelnikov IRE RAS (Saratov Branch). Е-mail: gekapavlov@gmail.com Yu.A. Filimonov - Dr.Sc. (Phys.-Math.), Head of the Kotelnikov IRE RAS (Saratov Branch)

E.S. Pavlov - Scientific Researcher, Kotelnikov SBIRE RAS E-mail: gekapavlov@gmail.com A.V. Sadovnikov - Ph.D. (Phys.-Math.), Scientific Researcher, Saratov State University named after N.G. Chernyshevskii Yu.A. Filimonov - Dr.Sc. (Phys.-Math.), Director of Kotelnikov SBIRE RAS

A.Kh. Abduev1, A.Sh. Asvarov2, A.K. Akhmedov3, S.V. Agasieva4, V.V. Belyaev5, D.V. Generalov6, D.V. Nikolaeva7, E.A. Smetanin8, Jonathan Andes Tirado Rosero9

1,4–9 Peoples Friendship University of Russia (Moscow, Russia)

2,3 Institute of Physics of Dagestan Federal Research Center of Russian Academy of Sciences (Makhachkala, Russia) 5 Moscow Region State University (Mytishchi, Russia)