Evaluation of lower natural frequencies of axisymmetric vibrations of laminate circular plates clamped on the boundary

Abstract

The new mathematical approach to the treatment of positron annihilation lifetime data in humidity-sensitive MgAlO ceramics are proposed. It is shown that watersorption processes in these ceramics leads to increase in positron trapping rates of extended defects located near intergranual boundaries. The fixation of direct positron lifetime components allows refining the most significant changes in positron trapping rate.