Electric Density Profile
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Um novo método para síntese de vidros fotônicos baseado na sinergia entre as técnicas VAD e ALD / A new method for synthesis of photonic glasses based on the synergy between VAD and ALD techniques
This study aimed to establish a new method for synthesis of photonic glasses through the synergy of Vapor-phase Axial Deposition (VAD) and Atomic Layer Deposition (ALD) techniques. Having the intention to obtain a completely transparent material containing a uniform distribution of dopant element both radial and axial position. In the first stage of this stu
Publicado em: 2011
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2. Optimizing the e-beam profile of a single carbon nanotube field emission device for electric propulsion systems
Abstract: Preliminary studies on field emission (FE) arrays comprised of carbon nanotubes (CNT) as an electron source for electric propulsion system show remarkably promising results. Design parameters for a carbon nanotube (CNT) field-emission device operating on triode configuration were numerically simulated and optimized in order to enhance the e-beam fo
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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3. Análise de DFA e de agrupamento do perfil de densidade de poços de petróleo
In recent years, the DFA introduced by Peng, was established as an important tool capable of detecting long-range autocorrelation in time series with non-stationary. This technique has been successfully applied to various areas such as: Econophysics, Biophysics, Medicine, Physics and Climatology. In this study, we used the DFA technique to obtain the Hurst e
Publicado em: 2009
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4. Projeto e fabricação de nao-estruturas por litografa interferometrica / Design and fabrication of nano-structures by interforometric lithography
In this work the interferometric lithography technique was developed for recording periodic relief nano-structures, one and bi-dimensional, on silicon and glass substrates. In particular, the work is focused in two directions: the study of the profile of the structures recorded in photorresist, through the superimposition of interference light patterns, and
Publicado em: 2008
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5. Impactos causados pela universalização do acesso e uso da energia elétrica
Public electric utilities have legal and contractual obligation to supply service to the market of their concession areas, without customer discrimination. New connections used to be accomplished partly with financial support of interested consumers, and the amount of investment of the distribution companies were established in regulations. This practice mad
Publicado em: 2007
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6. Perfil dos produtores de arroz irrigado da fronteira oeste do RS, ligados a Pirahy Alimentos / Profile of the producers irrigated rice(Orizum sativum L.), suppliers-partners of the agroindustria Pirahy Foods
The present work had how I aim to obtain informations on current situation of producers irrigated rice (orizum sativum l.), suppliers-partners of the Agroindústria Pirahy Food, in Saint western Borja-frontier of the Rio Grande do Sul, carried out through pesquiza carried out with producers of irrigated rice located in the local authorities of Saint Borja, I
Publicado em: 2007
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7. Synthesis and dielectric properties of the lase sintered Ba1-xCaxTiO3 (0 ≤ x ≤ 0.30) nanostructured ceramics / Síntese e propriedades dielétricas de cerâmicas nanoestruturadas de Ba1xCaxTiO3 (0 menor igual x menor igual 0.30) sinterizadas a laser
Ba1-xCaxTiO3 (0 ≤ x ≤ 0.30) nanocrystalline powders were successfully synthesized for the first time at relative low temperature (500 °C) by a modified polymeric precursor method. The densification of the ceramics was made by two distinct techniques: conventional sintering using an electric furnace; and by a laser sintering process in which a CO
Publicado em: 2006
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8. Espectroscopia Ãptica nÃo linear em sistemas atÃmicos envolvendo nÃveis de Rydberg
In this thesis we study nonlinear optical effects in alkali vapors, in which Rydberg levels play the role of near resonant intermediate levels, focusing our attention in processes such as: four wave mixing (FWM), two photon absorption, sum frequency generation (SF) and difference frequency generation (DF). We analyze a FWM process with two-photon transitions
Publicado em: 2002
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9. Aquecimento do plasma por radio frequencia na maquina linear lisa
We show in this work the characteristics of an experimental device assembled in the Instituto de Física, Universidade Federal Flurninense (Linear Mirror Type Machine LISA) to produce Helium plasma by RF and to study its behavior when confined by a magnetic field with mirrors. The plasma was produced by a micro-wave generator of, fRF = 2.45 GHz, PRF = 800 Wa
Publicado em: 1986
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10. Tamoxifen inhibits BK channels in chick cochlea without alterations in voltage-dependent activation
Large-conductance, Ca2+-activated, and voltage-gated potassium channels (BK, BKCa, or Maxi-K) play an important role in electrical tuning in nonmammalian vertebrate hair cells. Systematic changes in tuning frequency along the tonotopic axis largely result from variations in BK channel kinetics, but the molecular changes underpinning these functional variatio
American Physiological Society.
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11. Intracortical and corticothalamic coherency of fast spontaneous oscillations.
We report that fast (mainly 30- to 40-Hz) coherent electric field oscillations appear spontaneously during brain activation, as expressed by electroencephalogram (EEG) rhythms, and they outlast the stimulation of mesopontine cholinergic nuclei in acutely prepared cats. The fast oscillations also appear during the sleep-like EEG patterns of ketamine/xylazine
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12. Permeation through an open channel: Poisson-Nernst-Planck theory of a synthetic ionic channel.
The synthetic channel [acetyl-(LeuSerSerLeuLeuSerLeu)3-CONH2]6 (pore diameter approximately 8 A, length approximately 30 A) is a bundle of six alpha-helices with blocked termini. This simple channel has complex properties, which are difficult to explain, even qualitatively, by traditional theories: its single-channel currents rectify in symmetrical solutions