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Extração de matéria orgânica aquática por abaixamento de temperatura: Uma metodologia alternativa para manter a identidade da amostra
(2003-03-01)
In this work was developed an alternative methodology to separation of aquatic organic matter (AOM) present in natural river waters. The process is based in temperature decreasing of the aqueous sample under controlled ...
Sensores Multipixel CCD de Ultra Bajo Ruido de Lectura para Detección de Partículas
(2017-12-14)
Desde su invención en 1969, los dispositivos de acoplamiento de carga o Charge Coupled Devices (CCDs) se han usado intensamente en la detección de radiación dentro del espectro visible e infrarrojo cercano, tanto en ...
Cosmic reionization by primordial cosmic rays
(EDP Sciences, 2014-10)
Context. After the so-called cosmic recombination, the expanding universe entered into a period of darkness since most of the matter was in a neutral state. About a billion years later, however, the intergalactic space was ...
The role of John Milton's Paradise Lost in delineating the epic through fantasy in Philip Pullman’s His Dark Materials
(Universidade Tecnológica Federal do ParanáCuritibaBrasilLicenciatura em Letras Português/InglêsUTFPR, 2015-11-25)
In the field of literature, it is common to find literary works that interact among themselves creating a relation of intertextuality. Based on this, our research proposes to analyse the role of Paradise Lost by John Milton ...
Subterranean Desert Rodents (Genus Ctenomys) Create Soil Patches Enriched in Root Endophytic Fungal Propagules
(Springer, 2019-02)
Subterranean rodents are considered major soil engineers, as they can locally modify soil properties by their burrowing activities. In this study, the effect of a subterranean rodent of the genus Ctenomys on soil properties ...
Crossing the phantom divide with a classical Dirac field
(Springer, 2011-01)
In this paper we consider a spatially flat Friedmann-Robertson-Walker (FRW) cosmological model with cosmological constant, containing a stiff fluid and a classical Dirac field. The proposed cosmological scenario describes ...
Remarks on the properties of elliptical galaxies in modified Newtonian dynamic
(2011)
Context. Two incorrect arguments against MOND in elliptical galaxies could be that the equivalent circular velocity curves tend to become flat at much larger accelerations than in spiral galaxies, and that the Newtonian ...