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Energy levels in Si and SrTiO3-based quantum wells with charge image effects
Pereira,T. A. S.; Bezerra,M. G.; Freire,J. A. K.; Freire,V. N.; Farias,G. A.In the present work we develop a theoretical study to analyze how the image charges effects can modify the electronic properties in Si and SrTiO3-based quantum wells. We have used the method based on the calculation of the image charge potential by solving Poisson equation in cylindrical coordinates. The numerical results show that the electron-heavy hole recombination energy can be shifted by more than 200 meV...
Contribution of the charge image potential to carrier confinement in graded Si-...
Pereira,T. A. S.; Caetano,E. W. S.; Freire,J. A. K.; Freire,V. N.; Farias,G. A.In order to analyze the charging effects on electronic spectrum of Silicon (Si) based quantum wells (QW's), we use a method based on the calculation of the image charge potential by solving Poisson equation in cylindrical coordinates. The numerical results shows that the confined electron ground state energy level can be shifted by more than 50 meV due to the contribution of the image charges to the confinement...
Individualized monitoring of the therapy with gentamycin using pharmacokinetic ...
Carvalho, A; Serviço de Medicina, Serviços Farmacêuticos, Hospital de S. Francisco Xavier, Lisboa.; Fonseca, C; Falcão, F; Pereira, T A; Freitas, OGentamicin has an excellent cost/efficacy ratio for gram negative infections treatment. Its use is often limited in clinical practice by its narrow safety margins and a high incidence of toxicity. Gentamicin related nephrotoxicity is a major adverse effect, mostly in patients with other concomitant potential risk factors. As many other Authors we have found in our Internal Medicine Service during 1992 a gentami...
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