AbstractsGeography &GIS

"The object of this investigation is to determine by analytical means the temperature within a homogeneous semi-infinite solid, as a function of time, while the solid is receiving heat periodically by radiation on its one flat surface. Periodic heat flow means that heat flow is a continuous function of time and repeats itself at regular intervals. A semi-infinite solid has only one bounding plane and extends to infinity in all other directions...Much of this work deals with the soil temperatures of the earth both at the surface and at various depths. The surface of the earth is subjected to daily and annual temperature changes that are nearly periodic in nature. A knowledge of these fluctuations is desirable in determining the depth at which to lay pipe lines and water mains to prevent damage or decreased performance due to the effects of low temperature" – p. 1.