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Periodic thermal processes and periodic temperature fields are well represented in nature and technology. In nature, they occur largely due to periodic processes such as one year Earth's orbital motion, day and night cycle of the Earth's rotation around its own axis, etc. With conductive heat transfer mechanism daily temperature fluctuations almost damp in a layer thickness of about 1 m, annual temperatures do it in layer of 18 to 21 m thick. In the case where periodic heating by the Sun coincides with the mass tr...