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)

T.T. Magkoev1, D.G. Mustafaeva2

1 North Ossetian State University (Vladikavkaz, Russia)

2 North Caucasus Mining and Metallurgical Institute (State Technological University) (Vladikavkaz, Russia)

1 t_magkoev@mail.ru, 2 dzhamilya79@yandex.ru