Now showing items 21-24 of 24
Diffusion phenomena of the oxygen and nitrogen in niobium by mechanical spectroscopy
(Defect and Diffusion Forum, 2010-05-19) [Trabalho apresentado em evento]
The short-range diffusion phenomenon (Snoek Effect) was investigated by mechanical spectroscopy measurements between 300 K and 650 K, in a polycrystalline niobium sample, containing oxygen and nitrogen, using a torsion ...
Optical and transport properties of rare-earth trivalent ions located at different sites in sol-gel SnO2
(Journal of Physics: Conference Series, 2010-12-01) [Trabalho apresentado em evento]
Photoluminescence and photo-excited conductivity data as well as structural analysis are presented for sol-gel SnO2 thin films doped with rare earth ions Eu3+ and Er3+, deposited by sol-gel-dip-coating technique. ...
On the photonic dispersion of periodic superlattices made of left-handed materials
(NATO Science for Peace and Security Series B: Physics and Biophysics, 2010-02-12) [Trabalho apresentado em evento]
Studies of the band gap properties of one-dimensional superlattices with alternate layers of air and left-handed materials are carried out within the framework of Maxwell's equations. By left-handed material, we mean a ...
Excitons in undoped AlGaAs/GaAs wide parabolic quantum wells
(Journal of Physics: Conference Series, 2010-04-12) [Trabalho apresentado em evento]
In this work the electronic structure of undoped AlGaAs/GaAs wide parabolic quantum wells (PQWs) with different well widths (1000 and 3000 ) were investigated by means of photoluminescence (PL) measurements. Due to the ...