Troposphere
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Error Analysis of the Numerical Method for Correcting the Propagation of EM waves in the Troposphere
Abstract Electromagnetic (EM) waves do not travel in straight lines in the troposphere due to refraction. This leads to errors in many engineering applications. In order to correct these errors, a numerical solution based on the difference method has been proposed, which can reveal the degree of EM wave bending owing to atmospheric refraction, moreover, it c
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
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2. “Direct Me, I Beseech You, To Carcosa”: A Case Study of Literature, Plagiarism, and Retranslation
Abstract: This research delineates an interface between literature, plagiarism, and retranslation - having Jorge Luis Borges’ (1979) concept of creative infidelity as main theoretical framework - based on my own principles and experience as a literary translator. More specifically, I use the software WCopyFind for comparing my retranslation of “An Inhabi
Ilha Desterro. Publicado em: 29/08/2019
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3. Patrones de Circulación Atmosféricos-Oceánicos a Meso-Escala Vinculados a las Sequías Severas y Extensas en Venezuela
Abstract Monthly-averaged oceanic and atmospheric variables in the Tropical Atlantic and Pacific Oceans, during the occurrence of extensive droughts in the Venezuelan territory, were studied using the quarterly-timescale Standardized Precipitation Index for the period of 1950-2000. Monthly rainfall time series obtained mainly from the Instituto Nacional de M
Rev. bras. meteorol.. Publicado em: 2016-12
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4. Eventos extremos de precipitação no leste da Amazônia. / Extreme events of rainfall in Eastern Amazon.
The aim of this study was to characterize the extreme events of rainfall in Eastern Amazon, to analyze on ocean-atmosphere conditions in global scale associated with intense occurrence periods of these events, to contribute for temporal variation comprehension of rainfall extreme events, as well as of determinant phenomena to its occurrence and to make furth
Publicado em: 2010
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5. ESTUDO DO CICLO DIÁRIO DA CAMADA LIMITE PLANETÁRIA ATRAVÉS DA SIMULAÇÃO DOS GRANDES TURBILHÕES / STUDY OF DAILY CYCLE OF PLANETARY BOUNDARY LAYER BY LARGE EDDY SIMULATION
The PBL is the region on the troposphere characterized by existence of turbulence (BUSINGER, 1981). Turbulent flow is that when the fluctuations of the variables that describe the flow are amplified in time and space (LANDAU; LIFSHITZ, 1959). The study of the planetary boundary layer (PBL) through the computational fluid dynamics, particularly the large eddi
Publicado em: 2008
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6. Um estudo observacional da incursão de sistemas frontais no nordeste brasileiro e sua influência na atmosfera do Centro de Lançamento de Alcântara (CLA) / Observacional study of the incursion on frontal systems on northeast Brazil and its influence in the atmosphere of the Alcantara Launching Center (CLA)
In this work, an observational synoptic configuration pattern study was performed over the South America (SA) and in the South Atlantic (SAO) and South Pacific Oceans (SPO), in events of Frontal Systems (FSs) that reached the Brazilian northeast coast and created an intense cloudiness in the region of the Alcântara Launching Center (ALC). Seven cases were s
Publicado em: 2008
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7. Study of methane emission on Pantanal of Matogrosso do Sul / Estudo da emissão de metano no Pantanal Sul Matogrossense
The results of an evaluation of the tropical wetland regions contribution to the methane burden are presented. In this study, a total of eight campaigns were performed during the years of 2004 and 2005 inside the Pantanal region of Matogrosso do Sul State in seven sites, near the Miranda River. Static chamber technique with polyurethane syringe sampling was
Publicado em: 2007
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8. Estudo da emissão de metano no Pantanal Sul Matogrossense / Study of methane emission on Pantanal of Matogrosso do Sul
Apresentam-se os resultados de uma avaliação da contribuição das áreas alagadas tropicais no balanço atmosférico de metano. Neste estudo, foram realizadas oito campanhas na região Sul-Matogrossense do Pantanal durante os anos de 2004 e 2005, com coletas de amostras em sete diferentes locais escolhidos próximos ao Rio Miranda. Utilizou-se a técnica
Publicado em: 2007
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9. "Os fluxos turbulentos de partículas e de compostos orgânicos voláteis, e a distribuição vertical de aerossóis na baixa troposfera da Amazônia" / Measurement of turbulent fluxes of particles and volatile organic compounds, and the aerosol vertical distribution at the Amazonian low troposphere
A Amazônia constitui um ecossistema complexo, no qual a biosfera e a atmosfera estão intrinsecamente relacionadas. Às fontes biogênicas naturais somam-se emissões de queimadas, que alteram significativamente as características da população de aerossóis, e que afetam processos importantes no funcionamento do ecossistema. O presente trabalho integra o
Publicado em: 2006
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10. Cavados em médios níveis no hemisfério sul: climatologia, energética e ciclogênese em superfície / Midtropospheric trough in southern hemisphere: climatology, energetic and surface cyclogenesis
Southern Hemisphere and its relationship with the Southern America surface cyclogenesis. An objective method of trough identification and tracking was developed, which was applied for 24 years of NCEP/NCAR reanalysis 500 hPa geopotencial height data. We found, in mean, 868 troughs per year, with positive trend. The winter season (summer) presented greater (s
Publicado em: 2005
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11. Study of generation and propagation of the atmospheric gravity waves / Estudos de geração e propagação de ondas de gravidade atmosféricas
In this study the generation and propagation of the atmospheric gravity waves were investigated. The gravity waves in the mesopause region were observed by airglow all sky imaging technique at Cachoeira Paulista (23°S, 45°W), near tropic of Capricorn, and at São João do Cariri (7°S, 36°W), in the equatorial region. A reverse ray tracing method was test
Publicado em: 2004
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12. EFFECTS OF ATMOSPHERIC MULTIPATH IN LINE-OF -SIGHT MICROWAVE SYSTEMS / EFEITOS DE MULTIPERCURSOS ATMOSFÉRICOS EM ENLACES DE MICROONDAS EM VISIBILIDADE
The variations which happen in the troposphere layers throughout the time in relation to the median condition of the signal cause various phenomena that change the received signal level at digital radio relay systems randomly. The random changes are named fading. Fading is normally classified as fast or slow. The former is normally associated with the atmosp
Publicado em: 2004