Browsing Exact and Earth Sciences by Title
Now showing items 21-40 of 5712
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About the existence of warm H-rich pulsating white dwarfs
(2020) [Journal article]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) [Journal article]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) [Journal article]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) [Journal article]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) [Journal article]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) [Journal article] -
Access to diabetes diagnosis in Brazil based on recent testing and consultation : the Brazilian national health survey, 2013 and 2019
(2023) [Journal article]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) [Journal article]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) [Journal article]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) [Journal article]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) [Journal article]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) [Journal article] -
Acerca de um mito: o vórtice de Coriolis no ralo da pia
(2000) [Journal article]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) [Journal article] -
Ácidos naftênicos no petróleo
(2012) [Journal article]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) [Journal article]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 ... -
Ações desenvolvidas na REMAT : revista eletrônica da matemática com vistas à acessibilidade digital
(2017) [Journal article]A REMAT: Revista Eletrônica da Matemática (e-ISSN 2447-2689) tem como missão compartilhar práticas educativas e resultados de pesquisas que se relacionam com a matemática. Em busca da consolidação da revista perante a ... -
Activated carbon from sewage sludge for removal of sodium diclofenac and nimesulide from aqueous solutions
(2016) [Journal article]Sludge based activated carbons (ACs) were used to remove selected pharmaceuticals such as diclofenac (DCF) and nimesulide (NM) from aqueous solutions. The powered sewage sludge was mixed with different proportions of ZnCl2. ... -
Activated carbon obtained from sapelli wood sawdust by microwave heating for o-cresol adsorption
(2017) [Journal article]Activated carbon (AC) was prepared from sapelli wood sawdust using a microwave heating process. The biomass was mixed with inorganic components (lime + ZnCl2 and FeCl3) to form a homogeneous paste. The AC samples are denoted ...
