Stark Effect
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Short-term overreaction in equity ETFs following extreme one-day returns
Resumo O presente artigo investiga a previsibilidade a curto prazo dos preços de Exchange Trade Funds (ETFs) norte-americanos de ações em reação a retornos extremos ocorridos em um dia. Também avaliamos as características transversais associadas à super-reação dos preços após movimentos extremos de preço. A literatura sobre a super-reação de c
Rev. contab. finanç.. Publicado em: 25/03/2019
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2. Investigação teórica da quimisssorção do ânion metanossulfonato em eletrodos de platina (111) e (100) via método semi-empírico
Several electrochemical processes, such as electrocatalysis of organic substrates, make use of mediators. One of the mediators is the most commonly used anion methanesulfonate, CH3SO3, which has several advantages for such use, and chemical stability considered one of them. However, experimental studies indicate the possibility of this compound suffer the ad
Publicado em: 2010
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3. Molecular ressonances in cold Rydberg atoms / Ressonâncias Moleculares em átomos de Rydberg frios
The understanding of ultralong-range interaction involving cold Rydberg atoms is the main step for use this system in quantum computation. In this work, we have studied interaction involving $nD$ states in a new experimental setup, which allows us to control the electric field in a more efficient way. More specifically, we have studied the collision process
Publicado em: 2009
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4. Assistência clínica materna e neonatal às diferentes condições obstétricas em bovinos da raça Holandesa / Maternal and neonatal clinical assistance under distinct obstetrical conditions in Holstein cattle
The novel reproductive biotechnologies (ET, IVF and Cloning) require more accurate control of pregnancy and parturition, due to obstetrical problems as a result of the large offspring syndrome or reduced calf vitality associated with placental anomalies. Hence, the reduction in neonatal mortality is justifiable as research in this area progresses, aiming mat
Publicado em: 2008
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5. Propriedades eletrônicas e estruturais de nanotubos de dióxido de titânio por primeiros princípios
In this work, we perform first-principles calculations based on the Density Functional Theory (DFT) to study structural and electronic properties of TiO2 nanotubes. Firstly, we address structural aspects. For this purpose we consider a model in which the nanotubes are obtained by rolling up layers of anatase TiO2 oriented in the (001) direction. The stabilit
Publicado em: 2007
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6. Da epidemiologia para a neurociÃncia: entendendo NeurÃnios disparantes acoplados eletricamente atravÃs do Modelo sirs estocÃstico na rede hipercÃbica
The response function of individual sensory spiking neurons (ring rate vs. stimulus intensity) has a small dynamic range. For example, in olfactory sensory neurons, only ~ 10 dB of stimulus intensity can be reasonably coded, if saturation and low-stimulus noise were to be avoided. This is in stark contrast with the large dynamic range observed in the next sy
Publicado em: 2006
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7. STUDY OF THE CHARACTERISTICS OF MODULATORS OF AMPLITUDE MANUFACTURED WITH SEMICONDUCTING STRUCTURES INALAS/INGAAS AND ALGAAS/GAAS MQW / ESTUDO DAS CARACTERÍSTICAS DE MODULADORES DE AMPLITUDE FABRICADOS COM ESTRUTURAS SEMICONDUTORAS INALAS/INGAAS E ALGAAS/GAAS MQW
In this thesis work, is made an evaluation of modulators of amplitude based in the electrum-absorption effect. The structures used for the devices were multiple quantum wells of InAlAs/InGaAs and AlGaAs/GaAs. The structures of InAlAs/InGaAs are used to work in the commercial band of the telecommunications (1,55 µm). This is the reason it is important to opt
Publicado em: 2005
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8. Stark effect in CdTe/Cd1-xMn xTe strained double quantum wells
We report a detailed analysis of how the existence of interface roughness can change exciton localization in CdTe/Cd1-xMn xTe strained double quantum wells (DQW´s) taking into account magnetic and electric field effects. We consider that the potential, effective mass, and the intrinsic magnetization are dependent on the profile of the Mn molar fraction at t
Brazilian Journal of Physics. Publicado em: 2004-06
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9. Anomalous shift of the recombination energy in single asymmetric quantum wells
Self-consistent numerical calculation and photoluminescence (PL) measurements have been used to investigate the temperature dependence of the optical Stark effect in n-doped GaAs/AlGaAs single asymmetric quantum wells (SAQWs), grown by molecular beam epitaxy. In the low-temperature regime (5 to 40 K) a remarkable blue shift (9.8 meV) is observed in the PL pe
Brazilian Journal of Physics. Publicado em: 2002-06
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10. Socioeconomic conditions and other determinants of child height in southern Brazil: a multilevel analysis / CONDIÇÕES SOCIOECONÔMICAS E OUTROS DETERMINANTES DA ALTURA EM CRIANÇAS NO SUL DO BRASIL: UMA ANÁLISE MULTINÍVEL
A cross-sectional household population based study of height among 12-59 months children (n = 2632) was conducted in the city of Porto Alegre, Brazil. Multilevel linear regression was applied to investigate the effect of socio-economic and demographic conditions, physical and social environment, and health conditions on childrens height, measured by the heig
Publicado em: 2001
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11. PROJETO DE MODULADORES A EFEITOS STARK E SIMULAÇÃO DE SUAS PROPRIEDADES DE GUIA DE ONDA / DESIGN OF MODULATORS BASED ON THE STARK EFFECT AND SIMULATION OF THE WAVEGUIDING PROPRERTIES
The development of external modulators is fundamental since the presence of chirping deteriotates the direct modulation of laseres ati high frequencies. In this work a project of an amplitude modulator for high bit-rate telecommunication systems using the Stark effect in semiconductors was undertaken. In the proposed semiconductor structure the electro-absor
Publicado em: 1996
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12. Ressonâncias Stark e tunelamento em heteroestruturas semicondutoras. / Stark resonances and quantum tunnel effect in semiconductor heterostructures.
Neste trabalho determinamos a estrutura dos níveis dos estados quase-ligados e virtuais em sistemas de poços quânticos acoplados de AlGaAs-GaAs na presença de um campo elétrico externo (Voltagem) perpendicular às camadas semicondutoras. As heteroestruturas de AlGaAs-GaAs são modeladas por um conjunto de poços quânticos de potencial unidimensionais.
Publicado em: 1987