S.V. Avdeychik - Dr.Sc (Eng.), Associate Professor, Engineer, Ltd «Molder», Grodno, Republic of Belarus. E-mail: info@molder.by V.A. Struk - Dr.Sc. (Eng.), Professor, Chief Research Scientist, Yanka Kupala State University of Grodno, Republic of Belarus. E-mail: kaf_mirt@grsu.by V.G. Sarokin - Head of laboratory, Yanka Kupala State University of Grodno, Republic of Belarus. E-mail: sorvg@grsu.by A.S. Antonov - Senior lecturer, Yanka Kupala State University of Grodno, Republic of Belarus. E-mail: antonov.science@gmail.com