Atmospheric Heat
Mostrando 1-12 de 75 artigos, teses e dissertações.
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1. Um estudo das variações da temperatura do solo via equação do calor
Resumo Neste artigo, primeiramente será apresentada uma revisão do problema que relaciona a temperatura da superfície do solo com sua temperatura a uma dada profundidade, ou seja, através de variação periódica de temperatura na superfície do solo, deseja-se verificar a influência causada por essa a uma certa profundidade, ignorando influências dos
Rev. Bras. Ensino Fís.. Publicado em: 07/01/2019
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2. Nitrogen dopedTiO2photoactive in visible light
abstractIn this research TiO2 modified with nitrogen has been prepared. The synthesis method used was sol gel from the hydrolysis of titanium tetrabutoxide with urea solution, combined with a low temperature treatment at atmospheric pressure. The theoretical mole ratio N/Ti was equal to 0.5 and the theoretical mole ratio HNO3/TiO2 was equal to 0.5. The solid
Matéria (Rio J.). Publicado em: 2015-09
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3. Configuration Study of Structurally Integrated Thermal Protection Systems for a Sub-Orbital Platform
ABSTRACT: The atmospheric hypersonic flight of sub-orbital and space vehicles generates aerodynamic heating and high wall heat fluxes, inducing high temperatures on the vehicle's structures and affecting their mechanical behavior, besides degrading the operation of board equipment. Furthermore, since payload preservation is always mandatory, the use of effic
J. Aerosp. Technol. Manag.. Publicado em: 2015-06
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4. Trajectory Control During an Aeroassisted Maneuver Between Coplanar Circular Orbits
ABSTRACT: This paper presents the simulation results of an aeroassisted maneuver around the Earth, between coplanar circular orbits, from a geostationary orbit to a low orbit. The simulator developed considers a reference trajectory and a trajectory perturbed by external disturbances combined with non-idealities of sensors and actuators. It is able to operat
J. Aerosp. Technol. Manag.. Publicado em: 2014-06
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5. ESTIMATIVA DE BIOMASSA AÉREA E TEOR DE CARBONO DA ESPÉCIE RHIZOPHORA MANGLE L. / ABOVE-GROUND BIOMASS ESTIMATION AND CARBON STOCK IN RHIZOPHORA MANGLE L.
The interest in quantifying mangrove forest biomass has increased in recent years due to the potential that tropical forests have in accumulating atmospheric carbon. The high organic carbon in mangrove attributes an important role in the estimation of global carbon and the processes of climate change mitigation. The objective of this study was to develop all
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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6. Evapotranspiração em plantio de milho no cerrado.
RESUMO: O milho (Zea mays L.) é uma cultura de destaque no Cerrado e a disponibilidade de água é considerada um fator ambiental determinante na produtividade dessa cultura. Este trabalho teve como objetivo fornecer as taxas de evapotranspiração, relacionando-as com fatores ambientais em dias sem precipitação durante a estação chuvosa, de um plantio
Planaltina. Publicado em: 2011
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7. Medidas da emissão de poluentes e da eficiência na combustão assistida do glicerol residual de biodiesel. / Measurements of emissions and fuel efficiency of the assisted residual glycerol biodiesel.
With increased global production of biofuels in particular biodiesel, an excess of glycerol is being generated worldwide. This has caused a sharp drop in the price of this compound in the world market. Much thought has been given to a destination for this residue, since no one can lay it in the environment and one of the alternatives be to use would its calo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2010
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8. Reconstrução da hidrografia superficial do Atlântico Sul Ocidental desde o Último Máximo Glacial a partir do estudo de foraminíferos planctônicos / Sea surface hydrography reconstruction of the Western South Atlantic since the Last Glacial Maximum based on the study of planktonic foraminifera
The goal of this thesis is to document the paleoclimatic and paleoceanographic changes occurred at the millennial scale since the Last Glacial Maximum at the surface Western South Atlantic. Paleotemperature, paleosalinity and paleoproductivity estimates were obtained for this purpose based on faunal changes of foraminifera assemblages, carbon and oxygen stab
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/03/2010
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9. A finite element model for the ocean circulation driven by wind and atmospheric heat flux
A finite element model for solving ocean circulation forced by winds and atmospheric heat fluxes is presented. It is vertically integrated 1 1/2 layer model which solves the motion and continuity hydrodynamic equations coupled with the advection-diffusion transport equation for temperature. A space-time Petrov-Galerkin formulation is used to minimize the und
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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10. Sistema de monção da América do Sul: início e fim da estação chuvosa e sua relação com a Zona de Convergência Intertropical do Atlântico / The south american monsoon system: onset and demise of the rainy season and its relationship with the Atlantic Intertropical Convergence Zone
Physical, dynamic and thermodynamic aspects related to the South American Monsoon System (SAMS) are investigated for the 1979-2006 period. A new methodology to determine the onset and demise dates of the rainy season (ONR and DER, respectively) related to the SAMS is developed using the field of antisymmetric outgoing longwave radiation in relation to the eq
Publicado em: 2010
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11. Soldabilidade do aço USISAC350 na construção metálica
This study aimed to determine the welding characteristics of USISAC350 (16.0 and 37.5 mm thick) and ASTMA588B (16.0 mm thick) steel grades. These steel grades present similar mechanical strength and atmospheric corrosion resistance with a significant difference in alloy design. For this characterization, chemical and microstructural analyses as well as tensi
Publicado em: 2010
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12. Numerical investigation of aerothermodynamic in a reentry vehicle with surface discontinuity-like cavity / Investigação numérica da aerotermodinâmica de veículos na reentrada com imperfeições na superficie do tipo cavidade
In the design of hypersonic vehicles, the knowledge of factors that affects the thermal and aerodynamic loads acting on the vehicle surface becomes imperative. Usually, in the thermal load calculations, the analysis assumes that the vehicle has a smooth surface. However, discontinuities or imperfections are present on the surface of reentry vehicles. In this
Publicado em: 2010