Observations Of The Sky
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Characterization of traveling ionospheric disturbances over low latitude brazilian region associated to Perkins plasma instability generated at medium latitudes / Caracterização de distúrbios ionosféricos propagantes na região de baixas latitudes no setor brasileiro associados à instabilidade de plasma Perkins gerada em médias latitudes
With ground based measurements of OI 630 nm emission, by using all-sky imaging system installed at Cachoeira Paulista, we investigated the occurrence of specific events of Medium Scale Traveling Ionospheric Disturbances (MSTIDs), which occurred during nights geomagnetically quiet. Probably, these disturbances are associated with Perkins plasma instability ge
Publicado em: 2010
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2. Avaliação de modelos fotoquímicos de qualidade do ar e estudo das circulações atmosféricas nos processos de dispersão de poluentes / Evaluation of air quality photochemical models and atmospheric circulations in the pollution dispersion processes.
Throughout numerical simulations and near to surface measurements of pollutants concentrations, in this work some meteorological situations of relevance for high ozone concentrations episodes over the Metropolitan Area of Sao Paulo (MASP) were studied., between 1999 and 2006. Firstly, two photochemical models, CIT and SPM-BRAMS, were evaluated in the sense o
Publicado em: 2008
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3. Uma nova estratégia de otimização de arranjos interferométricos aplicada ao Brazilian Decimetric Array / A new strategy for array optimization applied to brazilian decimetric array
Radio interferometric arrays measure the Fourier transform of the sky brightness distribution in a finite set of points that are determined by the cross-correlation of different pairs of antennas of the array. The sky brightness distribution is reconstructed by the inverse Fourier transform of the sampled visibilities. The quality of the reconstructed images
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/03/2006
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4. PadrÃo de assentamento em sÃtios arqueolÃgicos na zona da mata norte de Alagoas e sul de Pernambuco
Several Indian populations occupied, per centurie, North Forest of Alagoas States and South of Pernambuco State. The first information concerning these populations appears with the publication of the columnistsâ texts and religious persons of the Brazilian colonial period. Later documents of the imperial and republican Brazilian State described the existenc
Publicado em: 2006
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5. A astronomia na formação continuada de professores e o papel da racionalidade pratica para o tema da observação do ceu / Astronomy in the training of teachers and the role of practical rationality in sky observation
Este trabalho analisa o avanço propiciado por um projeto de fonnação continuada para professores do ensino fundamental com o tema observação do céu em Astronomia, levando-se em conta as especificidades do conhecimento, o referencial do professor reflexivo e as práticas de tutoria. Para isto, foi realizado um curso de Astronomia para professores de Ci�
Publicado em: 2006
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6. Um mapa da emissão galática em 408 MHz. / A map of the galactic emission at 408 MHz.
We present a map of the Galactic Emission at 408 MHz prepared from the data collected with the radiotelescope of the Galactic Emission Mapping (GEM) project operating in the Owens Valleys desert (CA - USA) in April 1994. A total power receiver was used with the following characteristics: bandwidth of 28 MHz, noise temperature of 112 K, gain of 57. 8 KV-1, an
Publicado em: 2000
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7. Orographic enhancement processes of precipitation in Serra do Mar, São Paulo, Brazil. / Processos de Intensificação Orográfica da Precipitação na Serra do Mar em São Paulo.
This is the first Brazilian study on processes of orographic rainfall enhancement. The studied mountain range is Serra do Mar in the southeastern coast region of the São Paulo State, where the average annual accumulation exceeds 4000 mm. The used data set was composed by 30-minute recording raingauge network, 10-minute CAPPI maps from the Ponte Nova S-band
Publicado em: 1999
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8. An Analysis of Some Observations of Thermal Comfort in an Equatorial Climate
The analysis is introduced by a brief account of the development of work on thermal comfort. The observations, which are fully described in relation to the interior climates which were experienced, were made in Singapore in 1949-50. The climate of Singapore is typical of the equator, being warm, damp and windless; and the annual variation is almost negligibl
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9. Grs 1915+105: a superluminal source in the Galaxy.
We present the results of additional observations of the high energy source GRS 1915+105, which produces ejecta with apparent superluminal motions. The observations reported here were carried out with the Very Large Array at 3.5 cm and 20 cm. The 3.5-cm observations made during 1994 May allowed us to continue following the proper motions of the bright 1994 M
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10. Measuring the topology of the universe
Observations of microwave background fluctuations can yield information not only about the geometry of the universe but potentially about the topology of the universe. If the universe is negatively curved, then the characteristic scale for the topology of the universe is the curvature radius. Thus, if we are seeing the effects of the geometry of the uni
National Academy of Sciences.
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11. Compact steep-spectrum sources and the unified scheme.
The compact steep-spectrum sources (CSSs) are an interesting class of objects which are of subgalactic dimensions; they occur more frequently in high-frequency surveys because their spectra often turn over at lower frequencies. We have estimated the symmetry parameters of a well-defined sample of CSSs and compared these with the larger 3CR sources of similar
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12. Very-long-baseline radio interferometry observations of low power radio galaxies.
The parsec scale properties of low power radio galaxies are reviewed here, using the available data on 12 Fanaroff-Riley type I galaxies. The most frequent radio structure is an asymmetric parsec-scale morphology--i.e., core and one-sided jet. It is shared by 9 (possibly 10) of the 12 mapped radio galaxies. One (possibly 2) of the other galaxies has a two-si