Astronomical Models
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Os modelos no Ensino de Ciências: Reações de estudantes ao utilizar um objeto-modelo mecânico concreto analógico didático (OMMCAD)
Resumo Neste manuscrito apresentamos a noção de objeto-modelo mecânico concreto analógico didático (OMMCAD), um tipo de modelo didático nascido na fusão da epistemologia Bungeana dos modelos (modelos científicos) com a didática das ciências (modelos didáticos), desenvolvido para fins de ensino-aprendizagem da temática astronômica do a) movimento
Rev. Bras. Ensino Fís.. Publicado em: 10/01/2020
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2. Dark Energy and The Accelerating Universe: Conceptual Aspects and Observational Tests / Energia escura e aceleração do Universo: Aspectos conceituais e testes observacionais
In the last decade, the extraordinary progress of the astronomical observations (distances with supernovas, matter and cosmic background radiation (CBR) power spectrum, X-ray surface brightness of galaxy clusters, etc) associated with important theoretical developments turned Cosmology one of the most exciting frontiers of contemporary science. In this thesi
Publicado em: 2010
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3. Optical polarimetry and modelling of the polar FL Ceti / Polarimetria óptica e modelagem da polar FL Ceti
Cataclysmics variables (CV) are binary systems of short orbital period composed by a white dwarf and a red dwarf star that fills its Roche lobe and transfers matter to the white dwarf. In polars, a particular subclass of CVs, matter follows the magnetic field lines of the white dwarf (about 10^7 Gauss on the surface) and gives rise an accretion column. Near
Publicado em: 2009
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4. Fundo estocástico de ondas gravitacionais gerados por buracos negros pré-galáctiocs / Stochastic Background of Gravitational Waves Generated By pre-galactic Black Hole Formation
Observation of the Cosmic Microwave Background Radiation (CMB) provide us with a clear information about the status of matter and radiation at the decoupling era like a snapshot of the Universe 300.000 years after the Big-Bang. Nowadays, through observations of the cosmic structure, we can build-up the history of the Universe from one billion years after the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2008
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5. Fundo estocástico de ondas gravitacionais gerados por buracos negros pré-galáctiocs / Stochastic Background of Gravitational Waves Generated By pre-galactic Black Hole Formation
Observation of the Cosmic Microwave Background Radiation (CMB) provide us with a clear information about the status of matter and radiation at the decoupling era like a snapshot of the Universe 300.000 years after the Big-Bang. Nowadays, through observations of the cosmic structure, we can build-up the history of the Universe from one billion years after the
Publicado em: 2008
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6. Acelaração do universo e criação gravitacional de matéria escura fria: novos modelos e testes observacionais
Recent astronomical observations (involving supernovae type Ia, cosmic background radiation anisotropy and galaxy clusters probes) have provided strong evidence that the observed universe is described by an accelerating, flat model whose space-time properties can be represented by the FriedmannRobertsonWalker (FRW) metric. However, the nature of the substanc
Publicado em: 2008
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7. The shape of space after WMAP data
What is the shape of space is a long-standing question in cosmology. I review recent advances in cosmic topology since it has entered a new era of experimental tests. High redshift surveys of astronomical sources and accurate maps of the Cosmic Microwave Background radiation (CMB) are beginning to hint at the shape of the universe, or at least to limit the w
Brazilian Journal of Physics. Publicado em: 2006-03
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8. "Geographic Cosmography: the astronomy in geography teaching" / "Cosmografia geográfica: a astronomia no ensino de geografia"
This research relates Astronomy Teaching to Geography Teaching and approaches a great number of subjects that express important relations between the terrestrial knowledge and the celestial knowledge. We have studied a field that is part of Cosmography and consists in a new reading in the Geography area, which is designated as "Geographic Cosmography", inste
Publicado em: 2006
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9. Alternative dark energy models: an overview
A large number of recent observational data strongly suggest that we live in a flat, accelerating Universe composed of ~ 1/3 of matter (baryonic + dark) and ~ 2/3 of an exotic component with large negative pressure, usually named Dark Energy or Quintessence. The basic set of experiments includes: observations from SNe Ia, CMB anisotropies, large scale struct
Brazilian Journal of Physics. Publicado em: 2004-03
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10. A system for treatment and visualization of astronomical spectral data / Um sistema para tratamento e visualização de dados astronômicos espectrais
The Brazilian Solar Spectroscope (BSS) is a radiotelescope that features high sensitivity and high spectral and temporal resolutions. The BSS is currently being used for the observation of solar explosions, in the decimetric bandwidth, at the Brazilian Institute for Space Research (INPE). An acquisition system was developed to digitise BSS signals up to 35 M
Publicado em: 1999
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11. Laboratory evidence for a key intermediate in the Venus atmosphere: Peroxychloroformyl radical
For two decades, the peroxychloroformyl radical, ClC(O)OO, has played a central role in models of the chemical stability of the Venus atmosphere. No confirmation, however, has been possible in the absence of laboratory measurements for ClC(O)OO. We report the isolation of ClC(O)OO in a cryogenic matrix and its infrared and ultraviolet spectral signatures. Th
National Academy of Sciences.
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12. Spectrum of 100-kyr glacial cycle: Orbital inclination, not eccentricity
Spectral analysis of climate data shows a strong narrow peak with period ≈100 kyr, attributed by the Milankovitch theory to changes in the eccentricity of the earth’s orbit. The narrowness of the peak does suggest an astronomical origin; however the shape of the peak is incompatible with both linear and nonlinear models that attribute the cycle to e
The National Academy of Sciences of the USA.