TEMPERATURE FIELD OF A TWO-LAYER CYLINDER WITH VOLUMETRIC HEAT SOURCES AND NONSTATIONARY BOUNDARIES A. K. Sokolov UDC 536.21:669.041 A numerical-analytical solution of a differential heat-conduction equation is suggested. Analytical expressions relating the initial and boundary conditions of heat transfer to parabolic temperature distributions in the layers of the cylinder are obtained for the end of the calculated interval of time. The calculation of the temperature field is reduced to the solution of a system of two ordinary differential equations. The error of the solution is analyzed. JEPTER7492019993 JEPTER749203