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Sedimentary processes on the NW Iberian continental Shelf since the late Little...
Martins, V.; Figueira, R.C.L.; França, E.J.; Ferreira, P.A.L.; Martins, P.; Santos, J.F.; Dias, J.M.A.; Laut, L.M.; Ferreira da Silva, E.; Rocha, F.The OMEX core CD110 W90, retrieved from the Douro Muddy Patch (DMP) off the River Douro in the north of Portugal, records the last ≈150 years, i.e. the period since the late Little Ice Age (LIA). The core chronology is mainly based upon 210Pb and 137Cs activities. Geochemical, granulometric and microfaunal (benthic foraminifera) data suggest the occurrence of precipitation changes which may have been, at least ...
Shelf-Ocean material exchange influencing the Atlantic chemical composition off...
Silva, T.; Martins, V.; Santos, J. F.; Dias, J. A.; Ferreira da Silva, E.; Rocha, F.; Ribeiro, S.Rivers are the main conduit of sediment to the shelf. The basin geology, the drainage area and the discharge rate are the major factors that determine their sediment load (Milliman and Syvistski, 1992). Besides suspended particles, dissolved components may also give some information on the eroded crust. Sr isotopes in carbonate shells of biological organisms have been used to study, in the geological record, th...
Learning roadmap studio : new approaches and strategies for efficient learning ...
Oliveira, Miguel; Serrano, José Artur Ferreira da Silva e ValeLearning systems have emerged in a set of different information systems, oriented for different kinds of organizations and institutions, such as learning management systems, knowledge management systems and learning content management systems, which can be integrated or merged with others. From past experience, it has been denoted that strategies and pedagogical processes are tasks that can be created, enriched...
Resonant tunneling of polarized electrons through nonmagnetic III-V semiconduct...
Araújo,C. Moysés; Silva,A. Ferreira da; Silva,E. A. de Andrada eThe quantum transport of spin-polarized electrons across nonmagnetic III-V semiconductor multiple barriers is considered theoretically. We have calculated the spin dependent transmission coeficient, for conducting electrons transversing lattice-matched In0. 53Ga0. 47As/GaAs0. 5Sb0: /In0. 53Ga0. 47As/ InP/In0. 53Ga0. 47As nanostructures with different numbers of asymmetric double barriers, as a function of elect...
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