S.А. Kapustin – Post-graduate Student,

Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: kapustin_1994@mail.ru

N.А. Novoselova – Ph.D. (Eng.), Associate Professor,

Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: physics@nntu.ru

A.A. Titarenko – Dr.Sc. (Eng.), Professor,

Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: physics@nntu.ru