А.L. Tyukin - Post-graduate Student, P.G. Demidov Yaroslavl State University. E-mail: tyukin.alexx@gmail.co I.М. Lebedev - Post-graduate Student, P.G. Demidov Yaroslavl State University. E-mail: ilyaleb@gmail.com А.L. Priorov - Dr.Sc. (Eng.), Associate Professor, P.G. Demidov Yaroslavl State University. E-mail: andcat@yandex.ru