Navegação Ciências Exatas e da Terra por Título
Resultados 21-40 de 6034
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About the existence of warm H-rich pulsating white dwarfs
(2020) [Artigo de periódico]Context. The possible existence of warm (Teff ∼ 19 000 K) pulsating DA white dwarf (WD) stars, hotter than ZZ Ceti stars, was predicted in theoretical studies more than 30 yr ago. These studies reported the occurrence of ... -
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Absolutely continuous invariant mesures for a class of affine interval exchange maps
(1995) [Artigo de periódico]We consider a class A of affine interval exchange maps of the interval and we analyse several ergodic properties of the elements of this class, among them the existence of absolutely continuous invariant probability measures. ... -
Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
(2022) [Artigo de periódico]The central part of the Galaxy hosts a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner halo, inner thick disc, inner thin disc, ... -
Abundances from integrated spectra of 47 Tucanae (NGC 104)
(2020) [Artigo de periódico]47 Tucanae is among the most studied and observed globular clusters, given its proximity. The aim of this work is to study in detail the integrated spectrum of 47 Tucanae, as a template, in order to have a list of reliable ... -
Acacia bark residues as filler in polypropylene composites
(2015) [Artigo de periódico]Large amounts of acacia bark residues are produced each day after tannin extraction with hot water, being generally burned. This by-product was chemically characterized and used as filler in polypropylene (PP) composites, ... -
A acao das ongs e as novas formas de insercao profissional da geografia
(1998) [Artigo de periódico] -
Accessing the strong interaction between baryons and charged kaons with the femtoscopy technique at the LHC
(2023) [Artigo de periódico]The interaction between baryons and kaons/antikaons is a crucial ingredient for the strangeness S = 0 and S = −2 sector of the meson–baryon interaction at low energies. In particular, the K might help in understanding the ... -
Access to diabetes diagnosis in Brazil based on recent testing and consultation : the Brazilian national health survey, 2013 and 2019
(2023) [Artigo de periódico]Background: Screening for undiagnosed diabetes using glucose testing is recommended globally to allow preventive action among those detected. Our aim was to evaluate the access to glucose testing to screen for diabetes in ... -
Acciones para el cultivo de una Comunidad de Práctica Virtual de profesores de Física : análisis de los procesos de Participación Periférica Legítima a través de un curso virtual sobre Recursos Educativos Abiertos para la enseñanza de la Física
(2020) [Artigo de periódico]La literatura destaca la existencia de una significativa brecha entre la investigación educativa y las prácticas docentes. Por otro lado, existen estudios sobre Comunidades de Práctica (CoP) conformadas por docentes en ... -
Accumulation horizons and period adding in optically injected semiconductors lasers
(2007) [Artigo de periódico]We study the hierarchical structuring of islands of stable periodic oscillations inside chaotic regions in phase diagrams of single-mode semiconductor lasers with optical injection. Phase diagrams display remarkable ... -
Accuracy of the maximum entropy method
(1980) [Artigo de periódico]Although the maximum entropy method is capable of giving the period of a pure sine wave with very few data points, it is very sensitive to noise. The half power width of a spectral peak obtained by this method is proportional ... -
Accurate atmospheric parameters at moderate resolution using spectral indices : preliminary application to the MARVELS survey
(2014) [Artigo de periódico]Studies of Galactic chemical, and dynamical evolution in the solar neighborhood depend on the availability of precise atmospheric parameters (effective temperature Teff, metallicity [Fe/H], and surface gravity log g) for ... -
Acerca da mecânica estatística
(2006) [Artigo de periódico] -
Acerca de um mito: o vórtice de Coriolis no ralo da pia
(2000) [Artigo de periódico]A explicação usual que afirma ser a força de Coriolis responsável pelos redemoinhos ou vórtices em ralos de pias, tanques ou banheiras é questionada. Descrevem-se os experimentos realizados por Shapiro (1962), com o objetivo ... -
Acerca de viagens aéreas
(2006) [Artigo de periódico] -
Acesso a terra e exploração mineira em Moçambique : que implicações para as comunidades locais
(2014) [Artigo de periódico]Em Moçambique a terra desempenha um papel fundamental nas comunidades locais, onde a mesma para além de ser uma fonte de reprodução social desses grupos, ela se torna extensão dos mesmos, por sedimentar uma ligação com os ... -
Achievement of treatment goals and mortality in individuals with diabetes : the ELSA-Brasil study
(2023) [Artigo de periódico]Background: To prevent diabetes complications, the American Diabetes Association (ADA) has recommended the treatment of blood glucose, blood pressure, and LDL-cholesterol (LDL-c) to target levels. Our aim is to characterize ... -
Ácidos naftênicos no petróleo
(2012) [Artigo de periódico]Brazilian petroleum is known by its high acidity due to the presence of acidic constituents, especially naphthenic acids (NA). The total characterization of the NA in petrochemical samples has been receiving special attention ... -
Ações de atores territoriais: a construção do Porto de Rio Grande-RS, Brasil, como um nó estratégico no território do sul do Brasil
(2019) [Artigo de periódico]A formação de um território passa pela ação de atores territoriais que estabelecem estratégias mediante seus objetivos e necessidades. O trabalho tem como finalidade reconhecer a atuações dos atores na formação e transformação ...