Localized States
Mostrando 1-12 de 117 artigos, teses e dissertações.
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1. Towards development and validation of an intraoperative assessment tool for robot-assisted radical prostatectomy training: results of a Delphi study
ABSTRACT Introduction As urology training shifts toward competency-based frameworks, the need for tools for high stakes assessment of trainees is crucial. Validated assessment metrics are lacking for many robot-assisted radical prostatectomy (RARP). As it is quickly becoming the gold standard for treatment of localized prostate cancer, the development and
Int. braz j urol.. Publicado em: 2017-08
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2. N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions
N-F codoped TiO2 films were immobilized on stainless steel sheets through a combined approach involving a dip-coating technique and a hydrothermal treatment, followed by calcination at 400°C in the presence of air. Photocatalyst characterization was conducted using XRD, Raman and UV-VIS spectroscopy as well as SEM. The films were tested in a three-electrode
Mat. Res.. Publicado em: 23/02/2017
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3. Transporte elétrico e magnetotransporte em carbono granular
In this work we have studied the electrical conduction between localized states in samples with dierent volumetric densities of carbon-black, a kind of granular carbon. Firstly, we have shown that the Mott s variable range hopping (VRH) model t our data in a large range of temperatures. At low temperatures, we can see a deviation to a larger exponent, which
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/05/2011
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4. Localization of vibrational modes in low dimensional systems : an application to DNA / Localização de modos vibracionais em sistemas de baixa dimensionalidade : uma aplicação ao DNA
ln this work we studied the localization of vibrational modes of three simple models of DNA: unidimensional chain, double chain and the model of falir chains. ln these models, atomic groups were replaced by effective fiasses linked to each other by springs. For each model, the dynamic matrix was calculated and diagonalized obtaining the vibrational modes wit
Publicado em: 2009
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5. Estudos espectroscópicos e estruturais dos polímeros de coordenação 2D, ∞[Tb(DPA)(HDPA)] e ∞[Gd(DPA)(HDPA)]
This paper presents the synthesis of the coordination polymers ∞[Ln(DPA)(HDPA)] (DPA=2,6-pyridinedicarboxylate; Ln= Tb and Gd), their structural and spectroscopic properties. The structural study reveals that the ∞[Ln(DPA)(HDPA)] has a single Ln+3 ion coordinated with two H2DPA ligands in tridentade coordination mode, while two others H2DPA establish a s
Química Nova. Publicado em: 2009
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6. Estrutura eletrÃnica e propriedades espectroscÃpicas de compÃsitos polianilina/ouro: uma investigaÃÃo ab initio
In this dissertation we use ab initio quantum chemistry theoretical methods to examine possible effects that the presence of a small number of attached gold atoms could have upon the spectra of polyaniline (PANI) oligomers. We have investigated in special the theoretical fluorescence spectra of the gold-polyaniline composites, by using the Hartree-Fock appro
Publicado em: 2009
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7. Studies on the electrical and magnetic proprieties of GaMnAs nanostructure for use in spintronics / Estudos de propriedades elétricas e magnéticas em nanoestruturas de GaMnAs de uso em spintrônica
Um estudo da interação entre desordem e polarização de spin no GaMnAs ajuda a compreender a natureza dos estados, estendidos ou localizados, bem como as consequências para as transições observadas sobre as propriedades de transporte e às mudanças na ordem magnética de momentos magnéticos localizados em sítios de Mn. Este estudo pressupõe a ocorr
Publicado em: 2009
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8. Gamma-induced modification on optical band gap of CR-39 SSNTD
Effect of gamma irradiation on optical absorption of nuclear track detectors like CR-39 was studied in different absorbed doses using ultraviolet-visible (UV-VIS) spectroscopy. The existence of the peaks, their shifting and broadening as a result of gamma irradiation has been discussed. The width of the tail of localized states in the band gap (Eu) was evalu
Brazilian Journal of Physics. Publicado em: 2008-12
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9. Quantum percolation of one-electron states in power-law diluted chains
We investigate the nature of one-electron eigenstates in power-law diluted chains for which the probability of occurrence of a bond between sites separated by a distance r decays as p(r) = 1/r1+sigma. Using an exact diagonalization scheme on finite chains, we compute the spreading of an initially localized wave-packet, the time dependent participation number
Brazilian Journal of Physics. Publicado em: 2008-03
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10. Reformas neoliberais e política de formação continuada de professores nos Governos do novo Pará(1995-2006) / Neoliberal reforms and politics of continued formation of professors in the Governments of new Pará (1995-2006)
This work talks about the teachers formation, thought the often modality what is for the teachers of basic education, in high school, in the state of Pará, determined by the governmental politic, while the period with the name New Pará (1996-2006). Interrogating the configuration that assumed the politic of frequent formation executed by the governments of
Publicado em: 2008
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11. Fabricação e caracterização de dispositivos poliméricos emissores de luz com camada ativa de poli(2-metóxi, 5-(2-etil-hexilóxi)-1,4-fenileno vinileno) (MEH-PPV) / Fabrication and characterization of polymer light-emitting diodes with active layer composed by poly(2-methoxy, 5-(2-etil-hexilhoxy)-1,4-phenilene vinilene) (MEH-PPV).
Polymer light emitting diodes (PLEDs) have been widely investigated as candidate materials for display fabrication. The main advantages exhibited by PLEDs are the low-cost processing and possibility of large-area display fabrication, in comparison to the conventional liquid crystal displays (LCDs). Although the engineering aspects concerning device fabricati
Publicado em: 2008
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12. Optical and electrical characterization of photoconductive and photorefractive materials / Caracterização optica e eletrica de materiais fotocondutores e fotorrefrativos
The objective of this work was the characterization of photoconductive and photo-refractive materials using optical and electrical techniques. The most important property of these materials is photoconductivity so that we concentrated in the measurement of this quantity. One of the most studied materials in our laboratory, Bi12TiO20, is poorly photoconductiv
Publicado em: 2007