%0 Journal Article %T Internal friction investigation of the natural and compressed birch (Betula pendula Roth) wood %A Russu, A.V. %A Shamaev, V.A. %A Razinkov, E.M. %A Zimelis, A.. %K internal friction of wood, natural and modified wood birch (Betula pendula Roth), Boltzmann superposition principle, modification, ultrasound, magnetic field %J Forestry Engineering Journal %D 2023 %N 13 %P 20 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov