Abstract The optical behaviour, stoichiometry, surface configuration of Cu 2 Se nanostructured thin layers prepared at different reaction times by the chemical process has been considered. band gap deposited films decreases from 2.92 eV to 2.08 for first transition and 2.18 1.2 second transition. In addition, it was shown that Urbach energy is independent film thickness, tail values localized s...

URBACH-WIETHE is a very rare autosomally recessive disorder characterized by infiltration of hyaline material into skin,oral cavity,larynx,and internal organs.in this report we persent a case of a 22 year old woman with small scars on her face,hoarseness,firm tongue and beaded papules along the margins of eyelids,who was referred to the deparment of ophthalmology of Kerman university No3: hospi...

A 10-year-old girl born of consanguineous marriage presented with hoarseness of voice and difficulty in protruding tongue since last five years. No other family member was affected. Cardiovascular, ophthalmological and neurological examination was normal. Hematological profile was normal, including X-ray skull. Cutaneous examination showed classical multiple beaded papules along the eyelid marg...

The optical transmission, photoluminescence, and reflection spectra have been measured on a high-quality wurtzite indium nitride (InN) single crystal in the range of 0.5–20.0 eV. The fundamental bandgap of intrinsic InN has been extracted by taking into account the Burstein–Moss shift, bandgap renormalization and Urbach band tail effects, and found to be very close to the recent strongly re-est...

We report on ab initio calculations of electronic states of two large and realistic models of amorphous silicon generated using a modified version of the Wooten-Winer-Weaire algorithm and relaxed, in both cases, with a Keating and a modified Stillinger-Weber potentials. The models have no coordination defects and a very narrow bond-angle distribution. We compute the electronic density-of-states...

In this paper, properties of slab deformation in sizing press mill as one of the slab reduction processes in hot rolling mills have been evaluated using the elastoviscoplastic finite element method with explicit formulation. Effect of prarameters such as initial slab width and thickness, reduction, feed pitch, and anvil speed on factors such as dogbone formation, head and tail fishtail profile,...

We employ three highly sensitive spectrometers: a photoacoustic spectrometer, a photothermal common-path interferometer and a whispering-gallery-resonator-based absorption spectrometer, for a comparative study of measuring the absorption coefficient of nominally transparent undoped, congruently grown lithium niobate for ordinarily and extraordinarily polarized light in the wavelength range from...