Spray deposited MnO2 thin films onto glass substrate were subjected to a post-deposition heat treatment and the effects of temperature on electrical transport properties were studied in details. The heating and cooling cycles of the samples are reversible after successive heat-treatments in air...

Undoped MnO2 thin films have been prepared by a modified spray pyrolysis technique under various deposition conditions and the effects of different variables on electrical and optical properties have been studied in detail. It is found that substrate temperature, spray rate, solution...

Based on the comparison between the stationary renewal survival of a new device with the parent survival of a used one, new classes of life distributions are introduced. These classes are the new renewal better than used, the new renewal better than used in expectation and the harmonic new...