Navegação Ciências Exatas e da Terra por Título
Resultados 1028-1047 de 5930
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As cores da lua cheia
(2008) [Artigo de periódico] -
Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
(2020) [Artigo de periódico]Cu1−xFexO nanoparticles were prepared using a freeze-drying process followed by heat treatment. The particles were then characterized using Mössbauer spectroscopy and magnetization techniques. The results revealed complex ... -
Core-softened fluids, water-like anomalies, and the liquid-liquid critical points
(2011) [Artigo de periódico]Molecular dynamics simulations are used to examine the relationship between water-like anomalies and the liquid-liquid critical point in a family of model fluids with multi-Gaussian, core-softened pair interactions. The ... -
Coricladus quiteriensis gen. et sp. nov., a new conifer in Southern-Brazil Gondwana (Lower Permian, Paraná Basin)
(2005) [Artigo de periódico]Um novo taxon de coníferas (Coricladus quiteriensis) é descrito a partir de fragmentos de megafósseis vegetais do nível de roof-shale do Afloramento Quitéria (Formação Rio Bonito – Permiano Inferior – Sul da Bacia do Paraná ... -
Coronal-line forest active galactic nuclei I. Physical properties of the emission-line regions
(2021) [Artigo de periódico]Coronal-line forest (CLiF) active galactic nuclei (AGNs) are characterized by strong high-ionization lines, which contrasts with what is found in most AGNs. Here, we carry out a multiwavelength analysis aimed at understanding ... -
Coronal line forest AGN : II. Analysis of the spectral energy distribution
(2023) [Artigo de periódico]Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are characterized by strong, high-ionization lines, which are in contrast to what is found in typical AGNs. Here, we carry out an infrared analysis aimed at understanding ... -
Corpo negro e determinação experimental da constante de Planck
(2005) [Artigo de periódico]Este trabalho visa contribuir na área de instrumentação para o ensino de Física, apresentando uma nova proposta para a determinação da constante de Planck utilizando diodos de emissão de luz, LED's (Light Emitting Diode) ... -
Corpos hipabissais correlacionados à formação Serra Geral na região do cerro do Coronel, RS : geologia e petrologia
(2014) [Artigo de periódico]A Formação Serra Geral é caracterizada por um expressivo volume de derrames básicos de composição toleítica e pela presença muito subordinada de vulcanitos ácidos. Inúmeros corpos intrusivos (soleiras e diques) são ... -
Os corpos negros : questões étnico-raciais, de gênero e suas intersecções na Física e na Astronomia brasileira
(2020) [Artigo de periódico]Em referência metafórica à clássica “questão do corpo negro” na Física do século XIX, problematizo, no presente ensaio, a realidade das pessoas negras nas áreas de Física e Astronomia no Brasil contemporâneo, empreendendo ... -
Correlação entre avaliações por testes de múltipla escolha e por provas analítico-expositivas : crítica e proposta metodológica
(1996) [Artigo de periódico]O objetivo deste trabalho é fazer uma crítica à metodologia utilizada por Pinho (1995), no estudo da correlação entre as avaliações por testes de escolha múltipla e por provas analítico-expositivas no concurso vestibular ... -
Correlation between giant magnetoresistence and magnetic interactions in a Co/Ag multilayed/granular system
(1997) [Artigo de periódico]Magnetizing, demagnetizing, and remanent magnetization curves for [Co (12 Å)/Ag(60 Å)]x15 multilayered/granular films thermally treated have been measured. The changes of the giant magnetoresistance and the interaction ... -
Correlation between magnetic interactions and giant magnetoresistance in melt-spun co/sub 10/cu/sub 90/ granular alloys
(1997) [Artigo de periódico]The effects of annealing on the structural, magnetic, and magnetotransport properties of melt-spun Co10Cu90 granular alloys were investigated. The interaction effects were studied from both remanent magnetization and ... -
A correlation between the highest energy cosmic rays and nearby active galactic nuclei detected by Fermi
(2010) [Artigo de periódico]We analyze the correlation of the positions of γ -ray sources in the Fermi Large Area Telescope (LAT) First Source Catalog (1FGL) and the First LAT Active Galactic Nuclei (AGNs) Catalog (1LAC) with the arrival directions ... -
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors
(2008) [Artigo de periódico]We report on magnetization and magnetoresistance measurements of single-crystal, melt-processed, and polycrystalline YBa2Cu3O7− samples with the purpose of disclosing the connection between the magnetic irreversibility ... -
A correlation between the stellar and [Fe II] velocity dispersions in active galaxies
(2013) [Artigo de periódico]We use near-infrared (near-IR) spectroscopic data from the inner few hundred parsecs of a sample of 47 active galaxies to investigate possible correlations between the stellar velocity dispersion (σ ), obtained from the ... -
Correlation decay and partial coherence in nonlinear wave interactions
(2003) [Artigo de periódico]In the present analysis we study the broad-band triplet interaction in regimes of large amplitudes. Linear response theories associated with nonlinear arguments are used to show that even though coherence of highfrequency ... -
Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at √sNN=8.16 TeV
(2021) [Artigo de periódico]Event-by-event long-range correlations of azimuthal anisotropy Fourier coefficients (vn) in 8.16 TeV pPb data, collected by the CMS experiment at the CERN Large Hadron Collider, are extracted using a subevent four-particle ... -
Correspondence analysis applied to ethnografic data : case examples
(1992) [Artigo de periódico]Resumo não disponível -
Corrosion and wear resistance of carbon films obtained by electrodeposition on ferritic stainless steel
(2015) [Artigo de periódico]In improving the corrosion and hardness proprieties of ferritic stainless steel, the use of protective coatings becomes an interesting alternative. In this study, a carbon layer was deposited on AISI 430 by electrodeposition ... -
Corrosion behavior of steel coated with thin film tin/ti composites
(1993) [Artigo de periódico]Thin film multilayered TiN/Ti composites are investigated as a possible alternative for protective coating of steels. Corrosion tests based in cyclovoltametry made in a buffered acetic acid solution reveal that multilayered ...