%0 Journal Article %T Crack formation in natural and pressure-modified silver birch (Betula pendula Roth) wood: the effect of the internal friction index under the influence of external disturbances %A Russu, A.V. %A Shamaev, V.A. %A Zimelis, A.. %K internal friction of wood, diagnostics of cracks in wood, natural and modified wood, drooping birch (Betula pendula Roth), ultrasound, pulsed magnetic field %J Forestry Engineering Journal %D 2023 %N 13 %P 16 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov