I. A. Vdovichenko Ph.D. (Phys.-Math.), Associate Professor,
Nizhny Novgorod State Technical University n.a. R.E. Alekseev
E-mail: physics@nntu.ru
G. S. Malyshev Post-graduate Student,
Nizhny Novgorod State Technical University n.a. R.E. Alekseev
E-mail: gr1g0r@yandex.ru
N. A. Novoselova Ph.D. (Eng.), Associate Professor,
Nizhny Novgorod State Technical University n.a. R.E. Alekseev
G. I. Shishkov Ph.D. (Eng.), Professor,
Nizhny Novgorod State Technical University n.a. R.E. Alekseev