Drift Waves
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Simulation of Current Pulses and Sound Waves Resulting from Partial Discharges in a Needle-Plane Geometry in Air
Abstract Partial discharges can occur in different types of electric equipment and cause progressive insulation deterioration, so there is interest in monitoring partial discharges for assessing the state of the isolation of an electric system and to predict failures. Techniques to detect partial discharges, such as detecting ultrasonic emission, have been p
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Combination of surveillance tools reveals that Yellow Fever virus can remain in the same Atlantic Forest area at least for three transmission seasons
BACKGROUND In Brazil, the Yellow Fever virus (YFV) is endemic in the Amazon, from where it eventually expands into epidemic waves. Coastal south-eastern (SE) Brazil, which has been a YFV-free region for eight decades, has reported a severe sylvatic outbreak since 2016. The virus spread from the north toward the south of the Rio de Janeiro (RJ) state, causin
Mem. Inst. Oswaldo Cruz. Publicado em: 29/04/2019
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3. Dinâmica da desembocadura do rio Itanhém, Alcobaça, BA / Morphodynamics at the Itanhaém Inlet, Alcobaça, BA
The morphodynamic processes at inlet systems are related to a variety of forcing conditions that create unique hydrodynamic conditions. The interaction of tidal currents, wave conditions, and river discharge at different levels result in complex dynamic patterns. The present work aims to understand the processes that control the dynamics of the Itanhaém Riv
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/10/2010
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4. Transporte caótico causado por ondas de deriva / Chaotic Transport Driven by Drift Waves
Um dos problemas enfrentados pelos cientistas para o confinamento de plasma em Tokamaks, para se obter fusão termonuclear controlada, é o transporte radial de partículas pela borda do plasma. Nessa dissertação, estudamos o transporte através de um modelo que relaciona as flutuações eletrostáticas na borda do plasma às ondas de deriva. Essas ondas c
Publicado em: 2010
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5. Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region / Assinaturas nos campos elétricos e magnéticos às ondas de gravidade e ondas planetárias de 2-dias na região E equatorial
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/02/2009
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6. Assinaturas nos campos elétricos e magnéticos às ondas de gravidade e ondas planetárias de 2-dias na região E equatorial / Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic an
Publicado em: 2009
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7. Processos dinÃmicos e evolutivos da zona costeira de Itamaracà por sensoriamento remoto e medidas in situ
The coastal zone of Itamaracà is like a highly dynamic environment where land and oceanic processes interact altering frequently coastal characteristics. In this context, this current study examines the responsible processes of such changes from the development and application of methodologies, which includes digital image processing and the obtaining of in
Publicado em: 2009
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8. Migração lateral da desembocadura do Rio Itapocú, Santa Catarina - Brasil: evolução morfológica e condicionantes físicas / Lateral migratin of the Itapocú Inlt, SC -Brazil: morphological evolution and forcing conditions
Inlets are highly dynamic environments subjected to the complex interaction between stabilizing and destabilizing factors. Depending on this interaction, inlets have a tendency to migrate along sandy barriers. One of the most effective mechanisms for transporting sediment alongshore and consequently controlling the migration of inlets, are currents generated
Publicado em: 2008
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9. Chaotic transport in plasmas / Transporte caótico em plasmas
This work presents a study of the particle transport through the edge of a plasma cofined in a tokamak. A model, with an infinite number of drift waves superposed to an equilibrium electrostatic potential, in addition to an uniform magnetic field, is introduced, what puts the problem in the form of mappings. Two mappings are analysed, viz. the standard map a
Publicado em: 2008
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10. Resposta da Plataforma Continental Sudeste a ventos sazonais e sinóticos de verão: estudos numéricos / Response of the South Brazil bight to summer seasonal and synoptic winds: numerical studie
In order to study the pertubations caused on the South Brazil Bigth (SBB) caused by the passage of a cold front during Summer, a mean basic state for currents was obtained using the POM (Princeton Ocean Model) through diagnostic simulation, followed by a short round prognostic. The mean currents modeled are in certain instancies similar to the currents measu
Publicado em: 2008
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11. Transporte de partículas induzido por ondas de deriva / Particle transport induced by drift waves
We investigate the chaotic particle transport by resonant drift waves propagating in tokamaks plasma edges with ~E × ~B poloidal zonal flow, a critical problem for the understanding of the confinement properties of fusion plasmas. We assume, for large aspect ratio tokamaks, a non integrable hamiltonian model (proposed by Horton) to describe the non linear d
Publicado em: 2007
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12. Patterns of sediment dispersion coastwise the State of Bahia - Brazil
Using the average directions of the main wave-fronts which approach the coast of Bahia State - coinciding with that of the main wind occurring in the area - and of their periods, we define a wave climate model based on the construction of refraction diagrams. The resulting model of sediment transport was able to reproduce, in a general way, the sediment disp
Anais da Academia Brasileira de Ciências. Publicado em: 2000-06