Radiative Transfer Models
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Comparison of spectral models in the computation of radiative heat transfer in participating media composed of gases and soot
Accurate combustion models are necessary to predict, among other effects, the production of pollutant gases and the heat transfer. As an important part of the combustion modeling, thermal radiation is often the dominant heat transfer mechanism, involving absorption and emission from soot and participating gases, such as water vapor and carbon dioxides. If th
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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2. Comparative analysis of mesoscale convective complexes using models simulations and satellite observations / Análise comparativa de complexos convectivos de mesoescala através de simulações de modelo e observações de satélite
In this study was analyzed the behavior of the Mesoscale Convective Complexes (MCC) that occurred in the South Central region of South America (40°S-15°S and 80°W e 30°W). The period chosen for the study of these systems was between September to March for the years 2007 and 2010. The FORTRAC tool was used to identify MCCs and found 43 systems. The period
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/09/2011
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3. Modelagem da radiação térmica em chamas laminares da combustão de metano em ar
This work analyses the effects of thermal radiation heat transfer on methane-air laminar diffusion flames. The analysis is based on the solution of the equations of continuity, fluid motion, species mass-fraction and enthalpy. The soot formation is accounted with a twoequation model while a chemistry mecanism with 112 reactions is used for the combustion of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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4. Application of artificial neural networks commitee machine in the solution of an inverse radiative transfer problem / Aplicação de máquinas de comitê de redes neurais artificiais na solução de um problema inverso em transferência radiativa
This work is based on the concept of neural networks committee machine and has the objective to solve the inverse radiative transfer problem in one-dimensional, homogeneous, absorbing and isotropic scattering media. The artificial neural networks committee machine adds and combines the knowledge acquired by an exact number of specialists which are represente
Publicado em: 2010
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5. Structural characterization from empirical modeling and GRART model evaluation in the Eucalyptus spp. canopies spectral characterization / Caracterização estrutural a partir de modelos empíricos e avaliação do modelo GRART na caracterização espectral de dosséis de Eucalyptus spp
Empirical modeling and models based on transfer theory have been applied to estimate quantitative information from spectral data and from their relationships with canopy biophysical parameters. Both modeling strategies have been explored here in order to estimate structural and spectral information from extit{Eucalyptus} spp. (eucalipto) canopies. Correlati
Publicado em: 2010
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6. Modelagem espectral da radiação em processos de combustão baseada no método do número de onda acumulado
O trabalho apresenta uma modificação do modelo do número de onda cumulativo (CW – Cumulative Wavenumber) para atender ao balanço de energia na determinação da transferência radiante de gases participantes não uniformes. De um modo geral, o modelo CW fornece resultados que se mostram precisos para o divergente do fluxo de calor radiante (ou taxa vol
Publicado em: 2010
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7. Estudos espectroscópicos de vidros sódio aluminofosfatos co-dopados com Yb3+ e Tm3+ / Spectroscopic studies of glasses sodium aluminophosphatos co-dopad with Yb3+ and Tm3+
This work presents a throughout near-infrared and visible spectroscopic characterization of two sets of Yb3+ and Tm3+ codoped sodium aluminophosphate glasses, prepared in nitrogen and ambient atmospheres. In these samples, the Yb3+ ions are employed as efficient sensitizers of 0.98 µm excitation, with subsequent energy transfer to Tm3+ ions. Results are dis
Publicado em: 2007
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8. Recuperação de perfis verticais de propriedades óticas inerentes a partir da radiação emergente da água / Reconstruction of vertical profiles of inherent optical properties from upwelling water radiances
The current work proposes a metodology for the reconstruction of inherent optical properties of natural waters, vertical profiles of the absorption and scattering coefficients, from multispectral radiometric data of the radiation emerging from water. The radiative transfer direct model is solved by the LTSN method and bio-optical models are employed to corre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2006
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9. Reconstruction of vertical profiles of inherent optical properties from upwelling water radiances / Recuperação de perfis verticais de propriedades óticas inerentes a partir da radiação emergente da água
The current work proposes a metodology for the reconstruction of inherent optical properties of natural waters, vertical profiles of the absorption and scattering coefficients, from multispectral radiometric data of the radiation emerging from water. The radiative transfer direct model is solved by the LTSN method and bio-optical models are employed to corre
Publicado em: 2006
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10. Albedo of an Amazon tropical rainforest: field measurements, remote sensing, modeling, and its influence on the regional climate / Albedo de uma floresta tropical Amazônica: medições de campo, sensoriamento remoto, modelagem, e sua influência no clima regional
Albedo is defined as a ratio between reflected solar radiation and incoming solar radiation over a surface. It is a main factor that affects the terrestrial radiation balance and has been frequently considered in the global and regional climate studies. Amazon is one of planets regions where the response of regional atmospheric circulation is more intense. S
Publicado em: 2006
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11. Validation of heat fluxes over the tropical atlantic: CPTEC coupled ocean-atmosphere model and observations / Validação dos fluxos de calor sobre o atlântico tropical: modelo acoplado oceano-atmosfera do CPTEC e observações
The goal of this work is to infer the importance of surface heat fluxes, estimated by several methods, in the determination of the Sea Surface Temperature (SST) fields in the tropical Atlantic using a set of general circulation ocean model Modular Ocean Model 3 (MOM 3) simulations and a Centro de Previsão de Tempo e Estudos Climáticos (CPTEC) coupled ocean
Publicado em: 2005
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12. Using HSB sensor to retrieval precipitable water and rainfall / Um estudo sobre o uso do sensor HSB na estimativa da água precipitável e da precipitação
This work exploits the capability of the Humidity Sensor Brazil (HSB) channel in retrieving Integrated Water Vapor Content and estimating precipitation. The data analyses of this study have been carried out in two stages: firstly using simulations of the HSB channel brightness temperatures from RTTOV and Kummerow radiative models, and secondly, using data fr
Publicado em: 2004