A.E. Kiselnikov – Post-graduate Student, P.G. Demidov Yaroslavl State University

E-mail: a.kiselnikov@uniyar.ac.ru

A.L. Priorov – Dr.Sc (Eng.), Associate Professor, P.G. Demidov Yaroslavl State University

E-mail: andcat@yandex.ru

M.A. Dubov – Ph.D (Eng.), Associate Professor, P.G. Demidov Yaroslavl State University E-mail: m.dubov@yandex.ru