Zobrazeno 1 - 10 of 20 pro vyhledávání: '"B A Castilho"'
1
Be, V and Cu in the halo star CS 31082-001 from near-UV spectroscopy
Autor: H Ernandes, B Barbuy, A Friaça, V Hill, M Spite, F Spite, B V Castilho, C J Evans
The ‘First Stars’ programme revealed the metal-poor halo star CS 31082-001 to be r-process and actinide rich, including the first measurement of a uranium abundance for an old star. To better characterize and understand such rare objects, we pres
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a80aca92d8779c3f5435871e26aaaa5
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2
Preliminary Design of the Brazilian's National Institute for Space Research Broadband Radiometer for Solar Observations
Autor: Manuela Ramos Silva, Fernando L. Guarnieri, Luiz Angelo Berni, Manuela Barbosa, R. H. Branco, M. Nishimori, J. Santos, B. Vaz Castilho, J. M. Rodríguez Gómez, L. R. Alves, M. J. A. M. Sampaio, Luis Eduardo Antunes Vieira, F. R. Cardoso, Olenir Maria Mendes, J. V. Vilas Boas, Graziela da Silva Savonov, Franciele Carlesso, A. Dal Lago, A. Silva Paula, L. A. Silva
Publikováno v: Proceedings of the International Astronomical Union. 12:224-226
The Total Solar Irradiance (TSI), which is the total radiation arriving at Earth's atmosphere from the Sun, is one of the most important forcing of the Earths climate. Measurements of the TSI have been made employing instruments on board several spac
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::027d27eddbbdf89e9da77c0649838651
https://doi.org/10.1017/s1743921317003866
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3
Single and double ionization of the camphor molecule excited around the C 1s edge
Autor: M. O. Silva-Moraes, Alexsandre F. Lago, A. C. F. Santos, R. B. de Castilho, G. G. B. de Souza, Cecilia Veronica Nunez, Sergio Pilling, Teodorico C. Ramalho, L. H. Coutinho
Publikováno v: Rapid Communications in Mass Spectrometry. 28:1769-1776
RATIONALE An interesting class of volatile compounds, the monoterpenes, is present in some plants although their functions are not yet fully understood. We have studied the interaction of the camphor molecule with monochromatic high-energy photons (s
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8f4ed9a455c385af5a5d1c4f82efb644
https://doi.org/10.1002/rcm.6961
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4
Excitation and ionic fragmentation of the carvone molecule (C10H14O) around the O 1s edge
Autor: M. O. Silva-Moraes, Alexsandre F. Lago, L. H. Coutinho, Sergio Pilling, Cecilia Veronica Nunez, G. G. B. de Souza, R. B. de Castilho, C.A. Lucas, A. C. F. Santos
Publikováno v: Journal of Electron Spectroscopy and Related Phenomena. 192:61-68
The electronic excitation and associated ionic dissociation of the carvone molecule have been studied around the oxygen 1s edge, using synchrotron radiation and time-of-flight techniques. Photoabsorption spectrum (total ion yield) and mass spectra ha
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::252f11e72ab259bdb6a423fd9f83f72a
https://doi.org/10.1016/j.elspec.2014.01.015
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5
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays
Autor: R. B. de Castilho, L. H. de Coutinho, R. L. Cavasso-Filho, Alexsandre F. Lago, R. R. T. Marinho, Diana P. P. Andrade, G. G. B. de Souza, Heloisa M. Boechat-Roberty, Sergio Pilling, E. M. do Nascimento, A. N. de Brito
Publikováno v: Monthly Notices of the Royal Astronomical Society. 411:2214-2222
An experimental photochemistry study involving gas- and solid-phase amino acids (glycine, DL-valine, DL-proline) and nucleobases (adenine and uracil) under soft X-rays was performed. The aim was to test the molecular stabilities of essential biomolec
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::df3631690d4acb9096f4ca9eb80837c0
https://doi.org/10.1111/j.1365-2966.2010.17840.x
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6
Survival of gas phase amino acids and nucleobases in space radiation conditions
Autor: Diana P. P. Andrade, L. H. Coutinho, A. Naves de Brito, G. G. B. de Souza, Alexsandre F. Lago, Sergio Pilling, R. B. de Castilho, Heloisa M. Boechat-Roberty, R. L. Cavasso-Filho
Publikováno v: Proceedings of the International Astronomical Union. 4:371-376
We present experimental studies on the photoionization and photodissociation processes (photodestruction) of gaseous amino acids and nucleobases in interstellar and interplanetary radiation conditions analogs. The measurements have been undertaken at
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03c26cb06f7a64a73dc140e302181b08
https://doi.org/10.1017/s1743921308021996
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7
Dissociative photoionization of adenine following valence excitation
Autor: Sergio Pilling, G. G. B. de Souza, A. Naves de Brito, Alexsandre F. Lago, L. H. Coutinho, R. B. de Castilho
Publikováno v: Rapid Communications in Mass Spectrometry. 21:3646-3652
We present results on the valence level excitation, ionization and dissociation of adenine, using time-of-flight mass spectrometry and synchrotron radiation, in the vacuum ultraviolet (VUV) range of 12-21 eV. The measurements were performed using a g
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3208d131da889a7ddd5cf3af961870d8
https://doi.org/10.1002/rcm.3259
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10
Polarimetry of Li-rich giants
Autor: Antonio Pereyra, B. V. Castilho, Antonio Mário Magalhães
Publikováno v: Astronomy & Astrophysics. 449:211-222
Protoplanetary nebulae typically present non-spherical envelopes. The origin of such geometry is still controversial. There are indications that it may be carried over from an earlier phase of stellar evolution, such as the AGB phase. But how early i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42c8a2ab3fc85e78b462966ea7e6fb0a
https://doi.org/10.1051/0004-6361:20054270
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