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Ostracodos do Toarciano de Rabaçal (região de Coimbra): novos dados biostratigr...
Loureiro, I. M.; Cabral, M. C.; Duarte, L. V.; Azerêdo, A. C.Foram estudados os ostracodos de 58 amostras margosas representativas de toda a série toarciana do corte de Rabaçal. Esta série margo-calcária, depositada em meio marinho profundo, é rica em macrofauna nectónica e bentónica, estando bem calibrada biostratigraficamente por amonóides e nanofósseis calcários. Os novos resultados agora obtidos para os ostracodos permitem estabelecer uma escala biostratigráfica para...
Definition of the Portuguese frameworks with international relevance as an inpu...
Brilha, J.; Cunha, Pedro P.; Azerêdo, A.; Barriga, F. J. A. S.; Azeredo, A.; Cachão, M.; Couto, H.; Andrade, C.; Crispim, J. A.; Dantas, P.This work constitutes the first contribution for the systematisation of the geological heritage knowledge in Portugal, following the international recomendations for the characterisation of geological heritage (IUGS, ProGEO). The application of the ProGEO methodology has resulted on the creation of fourteen frameworks with international relevance, established by consensus among the Portuguese geological communi...
Bending of light in the framework of R + R2 gravity
Accioly,A.; Azeredo,A.D.; Rey Neto,E.C. de; Mukai,H.We present a tree level approach to the issue of the deflection of photons by the gravitational field of the Sun, treated as an external field, on the basis of R + R2 gravity. We show that the deflection angle of a photon grazing the surface of the Sun is exactly the same as that given by general relativity. An explanation for this strange coincidence is provided.
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