V.V. Glotov1, I.V. Ostroumov2, I.V. Sviridova3, S.M. Fedorov4

1–4 Voronezh State Technical University (Voronezh, Russia)

1 vadik-livny@mail.ru, 2 vanik07@mail.ru, 3 ri-ss-ka@mail.ru, 4 zar36@yandex.ru