A method for making a quasi-incompressible phase-change material having low thermal conductivity includes combining with a phase-change material in liquid state a thickening agent selected to reduce significantly thermal convection, the formed material having, depending on the combinations performed, a gelled structure or a colloidal dispersed system. A positive write field is applied to a first region to align the moments of both ferromagnetic films with the positive field, and then a negative write field is applied to an adjacent region to align the moments of both ferromagnetic films with the negative field. Further, preclusion of attempted utilization of the restricted cell occurs when the user equipment unit attempts cell reselection. The sticky surface of the non-woven cloth is applied with activated carbon, or fragrant material able to give out fragrance or material able to remove bad smell in air.