Navegação Ciências Exatas e da Terra por Título
Resultados 3758-3777 de 5965
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Optical and mid-infrared neon abundance determinations in star-forming regions
(2013) [Artigo de periódico]We have used observational spectroscopic data of star-forming regions compiled from the literature and photoionization models to analyse the neon ionic abundances obtained using both optical and mid-infrared emission lines. ... -
Optical and near-ir spectrophotometry of the galaxy ngc 3310
(1993) [Artigo de periódico]We present spectrophotometric observations in the optical and near-infrared of the nucleus and six H11 regions in the spiral galaxy NGC 3310. Four of the regions are circumnuclear at less than 400 pc from the nucleus, and ... -
Optical and structural properties of Si nanocrystals produced by Si hot implantation
(2007) [Artigo de periódico]It was already demonstrated that Si hot implantation followed by high-temperature annealing induces the formation of Si nanocrystals Si NCs which when excited in a linear excitation regime present two photoluminescence PL ... -
Optical band gaps and composition dependence of hafnium–aluminate thin films grown by atomic layer chemical vapor deposition
(2005) [Artigo de periódico]We report the optical properties of unannealed hafnium–aluminate HfAlO films grown by atomic layer chemical vapor deposition ALCVD and correlate them with the aluminum contents in the films. Vacuum ultraviolet spectroscopic ... -
Optically monitored dip coating as a contactless viscometry method for liquid films
(2005) [Artigo de periódico]Real-time interferometric monitoring of the dip coating process is applied to the study of properties of flowing liquids. Nonvolatile Newtonian oils are considered, allowing validity of a simple model after the steady state ... -
Optical-near-IR analysis of globular clusters in the IKN dwarf spheroidal : a complex star formation history
(2015) [Artigo de periódico]Context. Age, metallicity, and spatial distribution of globular clusters (GCs) provide a powerful tool for reconstructing major starformation episodes in galaxies. IKN is a faint dwarf spheroidal (dSph) in the M 81 group ... -
Optical properties of Peaked Spectrum radio sources
(2022) [Artigo de periódico]In this work, we study the optical properties of compact radio sources selected from the literature in order to determine the impact of the radio-jet in their circumnuclear environment. Our sample includes 58 Compact Steep ... -
Optical spectroscopic properties of a sample of interacting galaxies
(1997) [Artigo de periódico]We present spectroscopic observations of 83 galaxies from a sample of 49 pairs of optically selected interacting galaxies, most of them previously unobserved. These pairs consist of a main galaxy (component A) and a companion ... -
Optical spectroscopy and narrow-band images of the variable Seyfert 1 galaxy NGC 3783
(1992) [Artigo de periódico]We present narrow-band images centered on [O III] λ5007, Hα, and adjacent continua of the Seyfert 1 galaxy NGC 3783. The continuum images evidence that the bar emission is mainly due to old stars. The [O III] λ5007 image ... -
Optical substructure and BCG offsets of Sunyaev–Zel’dovich and X-ray-selected galaxy clusters
(2018) [Artigo de periódico]We used optical imaging and spectroscopic data to derive substructure estimates for local Universe (z < 0.11) galaxy clusters from two different samples. The first was selected through the Sunyaev–Zel’dovich (SZ) effect ... -
Optimal cut-off points for waist circumference in the definition of metabolic syndrome in Brazilian adults : baseline analyses of the Longitudinal Study of Adult Health (ELSA-Brasil)
(2018) [Artigo de periódico]Background: Waist circumference (WC) has been incorporated in the definition of the metabolic syndrome (MetS) but the exact WC cut-off points across populations are not clear. The Joint Interim Statement (JIS) suggested ... -
Optimally adapted multistate neural networks trained with noise
(1999) [Artigo de periódico]The principle of adaptation in a noisy retrieval environment is extended here to a diluted attractor neural network of Q-state neurons trained with noisy data. The network is adapted to an appropriate noisy training overlap ... -
Optimization of an analytical protocol for the extraction, fractionation and determination of aromatic and aliphatic hydrocarbons in sediments
(2012) [Artigo de periódico]Neste trabalho foram aperfeiçoadas as etapas para determinação de hidrocarbonetos alifáticos e aromáticos em sedimentos. Durante as etapas de extração e concentração foram avaliados fatores determinantes como tempo, solvente ... -
Optimizing strategies to identify high risk of developing type 2 diabetes
(2023) [Artigo de periódico]Introduction: The success of diabetes prevention based on early treatment depends on high-quality screening. This study compared the diagnostic properties of currently recommended screening strategies against alternative ... -
Ore extensions and jacobson rings
(1992) [Artigo de periódico] -
Organizational capability deployment analysis for technology conversion into processes, products and services
(2013) [Artigo de periódico]This article discusses Organizational Capabilities as the basic components of business models that emerged under the New Product Development Process and Technological Management. In the context of the new Technology Based ... -
Orientation and morphology of Pt nanoparticles in γ-alumina processed via ion implantation and thermal annealing
(2020) [Artigo de periódico]Structure and chemistry of metal/metal-oxide interfaces are critical for many catalytic processes and sensing. Pristine interfaces of Pt and γ -Al2O3 were fabricated using high-energy ion implantation and thermal processing. ... -
Origem social e escolha pelo curso de graduação : inferências a partir de dados do ENADE
(2021) [Artigo de periódico]Neste trabalho analisamos dados de 861 mil estudantes que realizaram o Exame Nacional de Desempenho dos Estudantes entre 2016 e 2018, em relação aos motivos que levam à escolha de um curso de graduação. Realizamos análises ... -
Origin of the magnetization reversal of an Fe thin film on Si(111)
(2000) [Artigo de periódico]The magnetic behavior of a 60-Å Fe film grown on Si (111) is reported and discussed. Scanning tunneling microcopy images showed Fe stripes along one of the (110) directions in the (111) plane, which favors easy magnetization ... -
Oríkì òrìsà : canção e poesia oral iorubana no Brasil
(2023) [Artigo de periódico]Oríkì é um dos gêneros literários iorubá-africanos mais difundidos no Brasil, especialmente o oríkì òrìsà. No entanto, como parte do racismo linguístico e epistêmico, o seu potencial é pouco explorado nos cursos de Letras, ...
