Coherent Instabilities
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. 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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2. 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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3. Longitudinal phase space density manipulation in synchrotron light sources / Manipulação da densidade eletronica no espaço de fase longitudinal em fontes de luz sincrotron
Esta tese investiga a dinâmica longitudinal não-linear do feixe de elétrons de alta intensidade circulante no anel de armazenamento do Laboratório Nacional de Luz Síncrotron (LNLS). Em particular, analisamos os efeitos sobre os modos de oscilação coerentes instáveis e sobre as características de equilíbrio dos pacotes de elétrons decorrentes da ma
Publicado em: 2007
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4. ANÁLISE DO RISCO DE UM FUNDO DE AÇÕES PASSIVO EM UM MERCADO SUJEITO A INSTABILIDADES FINANCEIRAS / RISK ANALYSIS OF A PASSIVE MANAGEMENT STOCK FUND IN A MARKET SUBJECT TO FINANCIAL INSTABILITIES
The dissertation is an analysis of the market risk that an investor faces in a passive management stock fund linked to the IBOVESPA, supposing that the Brazilian financial market is subject to financial instabilities, which in theory can make the returns to become distant from a normal distribution. The risk is measured through the VaR and ETL, the latter be
Publicado em: 2004
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5. Dinamica de sistemas quanticos : atomos em cavidades de ions aprisionados
In this thesis we studied the dynamics of two quantum systems: atoms in a cavity and trapped ions. For atoms in a cavity ( QED ) , we studied the dynamics of field prepared in a superposition of coherent states and a statistical mixture. In this system, using a Intensity-Dependence Jaynes-Cummings model (DNJCM) we discuss some aspects of the dynamics of atom
Publicado em: 2002
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6. REFLECTOMETRIA COERENTE APLICADA AO ESTUDO DA INSTABILIDADE DE FREQÜÊNCIA E EFEITOS TÉRMICOS EM LASERS DE REALIMENTAÇÃO DISTRIBUÍDA / STUDY OF FREQUENCY INSTABILITY AND THERMAL EFFECTS IN DISTRIBUTAL FEEDBACK LASERS WITH COHERENT REFLECTOMETRY
Coherente reflectometry has been an important technique for characterization of optinal and optoeletronics devices used in communications systems. In this work, Coherente frequency domain reflectometry was used in the study of the Distributed-Feedback Semiconductor lasers characteristics. The measurement of thermal response of the laser module, linearity of
Publicado em: 1994
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7. Spectral bifurcations in dispersive wave turbulence
Dispersive wave turbulence is studied numerically for a class of one-dimensional nonlinear wave equations. Both deterministic and random (white noise in time) forcings are studied. Four distinct stable spectra are observed—the direct and inverse cascades of weak turbulence (WT) theory, thermal equilibrium, and a fourth spectrum (MMT; Majda, McLaughlin, Tab
The National Academy of Sciences.