Navegação Ciências Exatas e da Terra por Título
Resultados 1849-1868 de 6034
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Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons
(2020) [Artigo de periódico]Measurements of K∗(892)0 and φ(1020) resonance production in Pb–Pb and pp collisions at √sNN = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (|y| < ... -
Evidence of spectral evolution on the white dwarf sample from the Gaia mission
(2020) [Artigo de periódico]Since the Gaia data release 2, several works have been published describing a bifurcation in the observed white dwarf colour−magnitude diagram for GBP−GRP>0. Some possible explanations in the literature include the existence ... -
Evidence of spin-density-wave to spin-glass transformation in ynd alloys
(1995) [Artigo de periódico]Low-temperature ac and de magnetic susceptibility and specific-heat measurements have been carried out on YNd di1ute alloys, where the Nd concentrations are 1.9, 2.5, 4.5, 6.8, and 9.0 at. %. The most concentrated alloys ... -
Evidence of spin-orbital angular momentum interactions in relativistic heavy-ion collisions
(2020) [Artigo de periódico]The first evidence of spin alignment of vector mesons ( K * 0 and ϕ ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ 00 is measured at midrapidity ( | y | < 0.5 ) ... -
Evidence of thin helium envelopes in PG 1159 stars
(2008) [Artigo de periódico]We present evidence that PG 1159 stars could harbor He-rich envelopes substantially thinner than those predicted by current evolutionary models with current estimates of mass loss, which may be attributable to an extensive ... -
Evidências da formação de monocamada de óxido de alumínio sobre sílica, através de reações de enxerto
(2005) [Artigo de periódico]Aluminum oxide was dispersed on a commercial silica gel surface, using successive grafting reactions. The reaction products were characterized by N2 adsorption-desorption isotherms, scanning electron microscopy and infrared ... -
Evolução da prevalência de parasitoses intestinais em escolares em Caxias do Sul, RS
(2008) [Artigo de periódico]Relatos da prevalência das parasitoses intestinais no Brasil são pontuais e têm sido descritos em diferentes populações, tornando difícil um diagnóstico abrangente. Visando estudar a variação em 35 anos da prevalência de ... -
Evolução dinâmica de um curso a distância modelado por workflow
(2001) [Artigo de periódico]O objetivo deste artigo é caracterizar as mudanças dinâmicas que podem ocorrer no esquema conceitual de um curso para apoiar um ambiente na Web para oferecer o ensino em ambiente distribuído por meio de navegadores. Esta ... -
Evolução e elementos-chave do sistema de farmacovigilância do Brasil : uma revisão de escopo a partir da criação da Agência Nacional de Vigilância Sanitária
(2018) [Artigo de periódico]Esta revisão de escopo objetiva descrever e caracterizar o sistema de farmacovigilância do Brasil (SINAF) e averiguar o atendimento aos requisitos mínimos propostos pela Organização Mundial da Saúde para um desempenho ... -
Evolução paleotopográfica da margem continental brasileira durante o Fanerozoico: evidências a partir da termocronologia por traços de fissão em apatitas
(2019) [Artigo de periódico]Este trabalho explora banco de dados traços de fissão em apatitas com o objetivo de desenvolver uma visão sinóptica de padrões de denudação através do espaço-tempo na margem continental brasileira. A resposta geomorfológica ... -
Evolução tectono-estratigráfica e paleoclimática da formação maricá (Escudo Sul-Rio-Grandense, Brasil) : um exercício de geologia histórica e análise integrada de uma bacia sedimentar neoproterozóica
(2007) [Artigo de periódico]Significant improvement in the knowledge concerning the Neoproterozoic Maricá Formation of the Sul-riograndense Shield, southern Brazil, was obtained in the latest years. This contribution synthesizes recent data obtained ... -
Evolução termotectônica fanerozoica da margem continental na área do Rifte Recôncavo-Tucano-Jatobá
(2020) [Artigo de periódico]Foi realizada a reconstrução da história de denudação e evolução tectônica da margem continental do nordeste brasileiro na região do Rifte Recôncavo-Tucano-Jatobá, usando a termocronologia por traços de fissão em apatita ... -
Evolutionary origins of human apoptosis and genome-stability gene networks
(2008) [Artigo de periódico]Apoptosis is essential for complex multicellular organisms and its failure is associated with genome instability and cancer. Interactions between apoptosis and genome-maintenance mechanisms have been extensively documented ... -
Evolutionary plasticity determination by orthologous groups distribution
(2011) [Artigo de periódico]Background: Genetic plasticity may be understood as the ability of a functional gene network to tolerate alterations in its components or structure. Usually, the studies involving gene modifications in the course of the ... -
Evolutionary timescale of the pulsating white dwarf G117-B15A : the most stable optical clock known
(2000) [Artigo de periódico]We observe G117-B15A, the most precise optical clock known, to measure the rate of change of the main pulsation period of this blue-edge DAV white dwarf. Even though the obtained value is only within 1 σ, P = (2.3±1.4) x ... -
Evolution of diabetes in Brazil : prevalence data from the 2013 and 2019 Brazilian National Health Survey
(2022) [Artigo de periódico]The prevalence of diabetes has been growing worldwide. This study aimed to estimate the prevalence of self-reported diabetes in Brazil in 2019, to describe its evolution from 2013, and to evaluate the role of population ... -
Evolution of the accretion disc around the supermassive black hole of NGC 7213
(2017) [Artigo de periódico]We present observations of the double-peaked broad Hα profile emitted by the active nucleus of NGC7213 using the Gemini South Telescope in 13 epochs between 2011 September 27 and 2013 July 23. This is the first time that ... -
Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at √ sNN = 2.76 TeV
(2017) [Artigo de periódico]In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-pT trigger particle. Measurements of these correlations as a function of pseudorapidity ( η) ... -
Evolution of the nuclear accretion disk emission in NGC 1097 : getting closer to the black hole
(2003) [Artigo de periódico]We study the evolution of the broad, double-peaked H emission-line profile of the LINER/Seyfert 1 nucleus of NGC 1097, using 24 spectra obtained over a time span of 11 years—from 1991 November through 2002 October. While ... -
Evolution of TiO2 nanotubular morphology obtained in ethylene glycol/glycerol mixture and its photoelectrochemical performance
(2017) [Artigo de periódico]The evolution of TiO2 nanotubular morphology, synthesized in a mixture of fluorinated ethylene glycol and glycerol electrolyte, was studied as a function of the anodization time. The samples were characterized by FEG-SEM, ...