I.M. Lebedev - Post-graduate Student, P.G. Demidov Yaroslavl State University. E-mail: ilyaleb@gmail.com A.L. Tyukin - Post-graduate Student, P.G. Demidov Yaroslavl State University. E-mail: tyukin.alexx@gmail.com A.L. Priorov - Dr.Sc. (Eng.), Associate Professor, P.G. Demidov Yaroslavl State University. E-mail: tyukin.alexx@gmail.com A.V. Prozorov - Post-graduate Student, P.G. Demidov Yaroslavl State University. E-mail: alexprozoroff@gmail.com