The authors investigate the validity of Fourier's law in a two-dimensional monoatomic Toda lattice using the molecular dynamics method. The temperature profiles in the lattice exhibit an exponential behaviour with lattice position. The temperature dependence of thermal conductivity is necessarily derived from the spatial variation of the local temperature, and found to be inversely proportional to the local temperature. The validity of Fourier's law is confirmed by excluding the non-diffusive heat flow from the total heat currents.
Thermoluminescence (TL) and ESR phenomena induced by X-ray irradiation of the mixed samples of K2S0, and alkaline earth metal sulfate (MgSO, or BaSO,) were investigated in terms of the reactivities and the crystallographic properties. A high intensive TL resulted from the diffusion of a small amount of Mg'+ into K,SO, crystals. The amount formed of K2Mg2(S0,),, langbeinite, compound had a maximum at the stoichiometric composition. From the ESR measurements, SO,-radicals were found to be easily formed in the langbeinite by excitation. Both the TL and the ESR phenomena were hardly observed in the K,SO,-BaSO, system due to little diffusion of Ba" with much larger radius than Mg2 +. The results were mainly discussed on the basis of the radii of the component cations in these systems. In addition, the fundamental data as to the application to the ESR dosimetry were obtained.
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