Browsing Exact and Earth Sciences by Title
Now showing items 3778-3797 of 5964
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Orthogonality and the hausdorff dimension of the maximal measure
(1986) [Journal article]In this paper the orthogonality properties of iterated polynomials are shown to remain valid in some cases for rational maps. Using a functional equation fulfilled by the generating function, the author shows that the ... -
O oscilador linearmente amortecido
(1997) [Journal article]Neste trabalho, estudamos o oscilador harmônico amortecido (OHA) admitindo uma força de atrito de contato, que depende somente do sinal da velocidade. Apresentamos a solução deste sistema e uma comparação com a solução do ... -
Oscillatory interlayer coupling and magnetoresistance in magnetic metallic multilayers
(1992) [Journal article]The oscillations of the interlayer exchange coupling and the giant magnetoresistance effect in magnetic metallic multilayers have been intensively investigated both experimentally and theoretically. The current status of ... -
Oscillatory interlayer exchange and magnetoresistance in Fe/Cu multilayers
(1991) [Journal article]We have studied the magnetic and magnetotransport properties of Fe/Cu mu1tilayers prepared by sputtering. We find oscillations of the inter1ayer coupling as a function of the Cu thickness with the same long period as in ... -
Ostracoda (crustacea) from the Archipelago of São Pedro and São Paulo, equatorial Atlantic, with emphasis on a new hemicytheridae genus
(2013) [Journal article]The present study is a further contribution to the systematic knowledge of the shallow water marine ostracodes from the Brazilian oceanic islands. A total of 14 species belonging to 10 genera and eight families is herein ... -
Ostracodes (crustacea) from Cananéia-Iguape estuarine/lagoon system and geographical distribution of the mixohaline assemblages in southern and southeastern Brazil
(2007) [Journal article]As assembléias de ostracodes do sistema estuarino-lagunar de Cananéia-Iguape são pela primeira vez aqui discutidas em detalhe. Foram coletadas amostras em trinta e quatro pontos, eqüidistantes aproximadamente 1 km, incluindo ... -
Otimização do processo de transesterificação em duas etapas para produção de biodiesel através do planejamento experimental Doehlert
(2016) [Journal article]In this work, Doehlert experimental design was used to optimize the Transesterification Double Step Process (TDSP) method of methyl soybean oil biodiesel production which starts with a basic catalysis followed by an acidic ... -
Outdiffusion of Be during rapid thermal annealing of high dose be implanted gaas
(1990) [Journal article]The outdiffusion of Be implanted into GaAs has been found to be identical after capless or capped (Si3N4 or Si02 ) rapid thermal annealing (RTA) at 900-1000 ºC and to depend on the Be dose and its proximity to the surface. ... -
Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20
(2019) [Journal article]We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 × 1.9 kpc2 of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) ... -
Outflows, inflows, and young stars in the inner 200 pc of the Seyfert galaxy NGC 2110
(2019) [Journal article]We present a 2D mapping of stellar population age components, emission-line fluxes, gas excitation, and kinematics within the inner ∼200 pc of the Seyfert 2 galaxy NGC 2110. We used the Gemini North Integral Field Spectrograph ... -
Outflows in the inner kiloparsec of NGC1566 as revealed by molecular (ALMA) and ionized gas (Gemini-GMOS/IFU) kinematics
(2019) [Journal article]Context. Tracing nuclear inflows and outflows in active galactic nuclei (AGNs), determining the mass of gas involved in them, and their impact on the host galaxy and nuclear black hole requires 3D imaging studies of both ... -
Outflows in the narrow-line region of bright Seyfert galaxies : I. GMOS-IFU data
(2018) [Journal article]We present two-dimensional maps of emission-line fluxes and kinematics, as well as of the stellar kinematics of the central few kpc of five bright nearby Seyfert galaxies –Mrk 6, Mrk 79, Mrk 348, Mrk 607, and Mrk 1058 – ... -
Outliers : multicolour photometry guiding the search for evolved binary systems in the globular cluster 47Tucanae
(2018) [Journal article]We use Hubble Space Telescope multicolour photometry of the globular cluster 47 Tucanae to uncover a population of 24 objects with no previous classification that are outliers from the single-star model tracks in the ... -
Out-of-equilibrium dynamics of the Hopfield model in its spin-glass phase
(2000) [Journal article]In this paper, we study numerically the out-of-equilibrium dynamics of the Hopfield model for associative memory inside its spin-glass phase. Aside from its interest as a neural network model, it can also be considered as ... -
Overpressurized bubbles versus voids formed in helium implanted annealed silicon
(1997) [Journal article]The formation of helium induced cavities in silicon is studied as a function of implant energy (10 and 40 keV) and dose (131015, 131016, and 531016 cm22). Specimens are analyzed after annealing (800 °C, 10 min) by transmission ... -
Óxidos de ferro em cambissolos brunos no Rio Grande do Sul e sul de Minas Gerais
(1984) [Journal article]A mineralogia dos óxidos de ferro em horizontes B incipientes em ferropans e crostas de ferro de Cambis-solos Brunos do Rio Grande do Sul e de Minas Gerais, foi analisada por difratometria de raios X. A goethita é o óxido ... -
Óxidos de ferro em latossolos tropicais e subtropicais brasileiros em plantio direto
(2008) [Journal article]O sistema plantio direto (SPD) altera a taxa dos processos que ocorrem no solo, porém pouco se conhece sobre sua influência na mineralogia de solos tropicais e subtropicais. Este estudo teve por objetivo avaliar o efeito ... -
Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity–luminosity relation
(2023) [Journal article]We present oxygen abundances relative to hydrogen (O/H) in the narrow line regions (NLRs) gas phases of Seyferts 1 (Sy 1s) and Seyferts 2 (Sy 2s) active galactic nuclei (AGNs). We used fluxes of the optical narrow emission ... -
Oxygen reaction-diffusion in metalorganic chemical vapor deposition HfO/sub 2/ films annealed in O/sub 2/
(2002) [Journal article]Composition, atomic transport, and chemical reaction were investigated following annealing in O2 of ultrathin HfO2 films deposited on Si substrates thermally nitrided in NO. The as-prepared thin film composition was ... -
Oxygen species in HfO/sub 2/ films : an in situ x-ray photoelectron spectroscopy study
(2007) [Journal article]The chemical bonding of O atoms in HfO2 films on Si was investigated by in situ x-ray photoelectron spectroscopy in the O 1s spectral region. In addition to trivial O forming only O-Hf bonds, O 1s signals corresponding to ...
