introduction: to describe the underlay tympanoplasty technique using an acellular dermal graft(alloderm) for tympanic membrane (tm) reconstruction in a guinea pig model and to demonstrate the feasibility of the technique using alloderm tissue harvested from the prepuce as a source of tissue for future grafting in human tm reconstruction.   materials and methods: the prepuce was divided during c...

The (secondary) electron emission from multilayered Al$_2$O$_3$/TiN membranes has been investigated with a hemispherical collector system in scanning microscope for electrons energies between 0.3 and 10 keV. These ultra-thin are designed to function as transmission dynodes novel vacuum multipliers. Two different types, bi-layer tri-layer, have manufactured by means of atomic-layer deposition (A...

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