A produção animal nos ecossistemas do semi-árido é influenciada pela variabilidade espacial e interanual da oferta quantitativa e qualitativa de recursos forrageiros. A dinâmica da acumulação de fitomassa para a maioria das diferentes espécies da caatinga é pouco conhecida, o…

This paper presents a group of elements to improve the teaching and learning in technological education, applied to Information and Communication Technologies (ICT). These elements are based on some contributions issued from contemporary education models, namely, the thematic approach, meaningful…

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Adaptive finite element methods (FEM) have been widely used in applications for over 20 years now. In practice, they converge starting from coarse grids, although no mathematical theory has been able to prove this assertion. Ensuring an error reduction rate…

A new computable a posteriori error estimator is introduced, which relies on the solution of small discrete problems on stars. It exhibits built-in flux equilibration and is equivalent to the energy error up to data oscillation without any saturation assumption.…

Data oscillation is intrinsic information missed by the averaging process associated with finite element methods (FEM) regardless of quadrature. Ensuring a reduction rate of data oscillation, together with an error reduction based on a posteriori error estimators, we construct a…

En marge des recherches archéologiques traditionnelles, nous retrouvons aujourd’hui des compagnies privées qui contractent des accords et obtiennent des permis leur donnant le droit de prélever des objets à des fins lucratives sur les vestiges archéologiques submergés. Ces pratiques commerciales…

Tanto en sus escritos narrativos como en los políticos, sociológicos e históricos, es posible percibir en José Victorino Lastarria un idealismo latente –cifrado en la máxima «combatir la ignorancia»– que va construyendo una filantropía señera en las coordenadas latinoamericanas. La…

Many college students and their families are concerned about the high costs of textbooks. A company called Flat World Knowledge both gives away and sells open-source textbooks in a way it believes to be financially sustainable. This article reports on…

Despite integration of advanced functions that enable Femto Access Points (FAPs) to be deployed in a plug-and-play manner, the femtocell concept still cause several opened issues to be resolved. One of them represents an assignment of Physical Cell Identifiers (PCIs)…