%0 Journal Article %T Mathematical description of the stages of thermal expansion of pyrolysis waste wooden sleepers %A Savelev, A.. %A Khayrullina, E.. %A Khayrullina, M.. %A Tuntsev, D.. %A Romancheva, I.. %K wooden sleepers, drying, pyrolysis, condensation %J Actual directions of scientific researches of the XXI century: theory and practice %D 2015 %N 3 %P 4 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov