%0 Journal Article %T ESTIMATION OF THERMAL INSULATION THICKNESS AND DEPTH OF UNDERGROUND POLYETHYLENE HEAT SUPPLY PIPELINES IN REGIONS WITH PERMAFROST %A Akimov, M.P. %A Mordovskoy, S.D. %A Starostin, N.P. %K heat equation, pipeline, heat supply, permafrost, temperature, finite difference method, thawing depth, thermal insulation thickness %J Bulletin of Belgorod State Technological University named after. V. G. Shukhov %D 2020 %N 5 %P 8 %I Belgorod State Technological University named after V.G. Shukhov