Results 51 to 60 of about 43,582 (121)

Impact of stellar spots on the high-resolution transmission spectra of a giant planet around a Sun-like star

Astronomy & Astrophysics
Context. Transmission spectroscopy has enabled the analysis of exoplanet atmospheres. However, a major challenge in this field is the “noise” from host stars, caused by stellar activity such as dark spots and bright plages.
Lucero Jennifer P., Demangeon O. D. S., Cristo E., Dethier W., Santos N. C.   +4 more
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Análise por FT-IR (UATR e PAS) de microbicidas em filmes poliméricos de tintas comerciais

Polímeros, 2014
Este trabalho mostra a avaliação de duas técnicas de espectroscopia no infravermelho por transformada de Fourier (FT-IR), Universal Reflexão Total Atenuada (UATR) e Detecção Fotoacústica (PAS), para a caracterização dos microbicidas, OIT, carbendazim e ...
Ricardo Pedro, Rita de Cássia Lazzarini Dutra, Jeferson José Moraes, Milton Faria Diniz, Elizabeth da Costa Mattos   +4 more
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ADN – THE NEW OXIDIZER AROUND THE CORNER FOR AN ENVIRONMENTALLY FRIENDLY SMOKELESS PROPELLANT. doi:10.5028/jatm.2009.0102153160

Journal of Aerospace Technology and Management, 2011
The search for a smokeless propellant has encouraged scientists and engineers to look for a chlorine-free oxidizer as a substitute for AP (ammonium perchlorate).
Márcio Y. Nagamachi, José Irineu S. Oliveira, Aparecida M. Kawamoto, Rita de Cássia L. Dutra   +3 more
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THE ROLE OF ANTIOXIDANT ON PROPELLANT BINDER REACTIVITY DURING THERMAL AGING. doi: 10.5028/jatm.2010.02027310

Journal of Aerospace Technology and Management, 2011
Thermal aging of hydroxy-terminated polybutadiene (HTPB) stabilized with 2,6-di(tert-butyl)hydroxytoluene (BHT) was carried out at 60°C from 1 to 11 weeks.
Luciene Dias Villar, Rafael Filadelfo da Silva, Milton Faria Diniz, Marta Ferreira K. Takahashi, Luis Claúdio Rezende   +4 more
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MICROWAVE ABSORBING PAINTS AND SHEETS BASED ON CARBONYL IRON AND POLYANILINE: MEASUREMENT AND SIMULATION OF THEIR PROPERTIES. doi: 10.5028/jatm.2010.02016370

Journal of Aerospace Technology and Management, 2011
This paper presents the processing and characterization of electromagnetic radiation absorbing paints and sheets based on magnetic and dielectric materials dispersed in polymeric matrices.
Luiza de C. Folgueras, Mauro A. Alves, Mirabel C. Rezende   +2 more
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OPTIMIZATION OF THE PROCESS TO OBTAIN GLYCIDYL AZIDE POLYMER. doi: 10.5028/jatm.2009.01012934

Journal of Aerospace Technology and Management, 2011
This paper describes the action and results achieved during the optimization of Glycidyl Azide Polymer (GAP) characterization and process. Under different conditions, three different kinds of catalysts, BF3,
Jairo Sciamareli, Jorge R da Costa, Marta Ferreira K. Takahashi, Koshun Iha, Agda Alvarenga V. Berdugo, Milton F Diniz, Miriam H. Miyano, Carlos Ferreira   +7 more
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Exploring the surface of HD 189733 via Doppler shadow analysis of planetary transits

Astronomy & Astrophysics
Context. Transmission spectroscopy has advanced our understanding of exoplanet atmospheres, but it can be hindered by contamination originating in stellar heterogeneities, mainly coming from line-of-sight effects.
Gonçalves E. C., Cristo E., Dethier W., Santos N. C., Sousa S. G., Viana P. T. P., Azevedo Silva T., Allart R., Bourrier V.   +8 more
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Synthesis, Characterization and Applications of Iron Oxide Nanoparticles - a Short Review

Journal of Aerospace Technology and Management, 2015
Iron oxide is a polymorphous crystalline mineral, including hematite, a-Fe2O3, magnetite, Fe3O4 and maghemite, g-Fe2O3. In the area of solid propulsion, nanoparticulate materials such, hematite and maghemite, exhibit high performance on thermal ...
Eunice Aparecida Campos, Denise Villela Barcza Stockler Pinto, José Irineu Sampaio de Oliveira, Elizabeth da Costa Mattos, Rita de Cássia Lazzarini Dutra   +4 more
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CHARACTERIZATION OF SURFACE LEVEL WIND IN THE CENTRO DE LANÇAMENTO DE ALCÂNTARA FOR USE IN ROCKET STRUCTURE LOADING AND DISPERSION STUDIES DOI 10.5028/jatm.2012.04014911

Journal of Aerospace Technology and Management, 2012
We present wind data collected for ten days during the dry season in 2008 during the Murici II Campaign, which was carried out in the area of the Centro de Lançamento de Alcântara (CLA).
Edson R Marciotto, Gilberto Fisch, Luiz E Medeiros   +2 more
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Study of Conservation on Implicit Techniques for Unstructured Finite Volume Navier-Stokes Solvers

Journal of Aerospace Technology and Management, 2014
The work is a study of conservation on linearization techniques of time-marching schemes for the unstructured finite volume Reynolds-averaged Navier-Stokes formulation.
Carlos Junqueira-Junior, Leonardo Costa Scalabrin, Edson Basso, João Luiz F. Azevedo   +3 more
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