DCT_CT http://hdl.handle.net/10362/1445 2013-05-21T20:38:00Z 2013-05-21T20:38:00Z Santos, João Ricardo Ramos Mota dos http://hdl.handle.net/10362/9361 2013-04-19T08:49:50Z 2011-01-01T00:00:00Z

Title: Comportamento geotécnico de solos argilosos do vale diapírico de Sesimbra Authors: Santos, João Ricardo Ramos Mota dos Abstract: A presente dissertação tem como objectivo a obtenção de parâmetros de compressibilidade e permeabilidade dos terrenos pelíticos do vale diapírico de Sesimbra, pertencentes à “Formação-de-Dagorda”, de idade hetangiana, e discutir a sua influência em problemas registados em estruturas aí implantadas. A escolha deste local deve-se ao facto de ser uma zona com características geológicas muito particulares, onde se tem verificado crescente interesse na construção de residências de férias. Inicialmente, apresentam-se algumas considerações teóricas, bem como todos os conceitos que interessaram para este trabalho. Faz-se também um breve balanço dos estudos já realizados naqueles terrenos. Para a presente dissertação, foram utilizadas duas amostras ocorrentes nas zonas mais superficiais e meteorizadas da referida formação pelítica. À fase de recolha de amostras, seguiu-se um período onde foram efectuados diversos ensaios de identificação. Por fim, e com vista ao cumprimento do objectivo proposto, foram realizados ensaios edométricos para a determinação dos parâmetros de compressibilidade e consolidação das amostras. Para complementar o estudo, e obter uma comparação de resultados, foram utilizados provetes remoldados e indeformados. Por último, são apresentadas as principais conclusões retiradas no decorrer desta dissertação e, também, algumas propostas de trabalhos a realizar no futuro. Description: Dissertação para obtenção de Grau de Mestre em Engenharia Geológica (Geotecnia)

2011-01-01T00:00:00Z Rocha, R. B. http://hdl.handle.net/10362/5062 2011-02-09T09:50:30Z 2010-01-01T00:00:00Z

Title: Paleontologia e evolução a problemática da espécie em Paleozoologia Authors: Rocha, R. B. Abstract: The concept of species in Paleontology is of paramount importance since the correct taxonomic determinations are essential to establish the age of the beds where fossils are collected. Particularly since 1940, the concept of species from a biological context, corresponding to the variability of a set of interpopulation compatibility, led us to a new approach, in which a typological conception has been replaced by a populationist one. If the notion of species is not necessarily identical for all living organisms, the greater the difficulties of interpretation in the private world of cephalopod fossils. The latter, lend themselves well to population systematics, and where this concept of species rests primarily on the morphological similarities. Thus, the introduction of general ideas analyse "typological species", "biological species", the problem of the definition of a "population" in Paleontology, and also the importance of the biometric analysis of fossil associations. The classic examples of polymorphism amd polytypism, in existing or extinct organisms, show that the concept of fossil species, observed in a well-defined period of its lifetime, is no different from that of biological species. The study of the evolution of fossil organisms allow us to understand the modelities of evolution and the mechanisms of speciation here synthesized and fully documented, namely the anagenesis or sequential evolution and the cladogenesis or divergent evoltuion; these mechanisms are the basis of the synthetic or gradualist theory of evolution developed by Dobzhansky, Mayr, Huxley, Rensch and impson. This summary ends with a reference to the theory of punctuated (or intermittent) equilibria proposed by Gould and Eldredge, who presented a more objective interpretation of morphological gaps, considered as elements of evolution itself. The interdisciplinary collaboration between zoologists, geneticists and paleontologists, is compulsory in this domain. Paleozoology has a key role since it conveys the dynamism and depth to the dimension of space-time duality.

2010-01-01T00:00:00Z Lézin, C. Bonnet, L. Rey, J. Caetano, P. S. Gonçalves, P. Rocha, F. Rocha, R. B. http://hdl.handle.net/10362/5050 2011-07-14T13:54:11Z 2010-01-01T00:00:00Z

Title: Orbital forcing of stratal patterns in an inner platform carbonate sucession: an example from an Upper Hauterivian series of the Lusitanian Basin, Portugal Authors: Lézin, C.; Bonnet, L.; Rey, J.; Caetano, P. S.; Gonçalves, P.; Rocha, F.; Rocha, R. B. Abstract: With an example taken from a late-Hauterivian series of the Lusitanian Basin (Portugal), we will demonstrate the sedimentary record of orbital pattern variations and, consequently, climate variations in an inner platform environment with patterns and isolation changes, allows us to establish 4 major orders of periodicity related to orbital components:- The large cycles ob bed thickness variation, constituted by 31-32 beds, recording the 400 ky eccentricity cycle component;- The medium cycles, represented by byndles of 8-9 beds, related to the 100 ky eccentricity cycle component; - The small cycles, of 3-5 beds, recording the 41 ky obliquity components;- The very small cycles, of 2 beds, related to the 22 ky and 26 ky precession components. The mean duration of each bed is around 11.8 ky, a number very close to that of the precession hemi-cycle. Climatic control on qualitative production is confirmed by the close relation between the bed thickness variations, the insolation variability and the variation of micritized elements concentrations.

2010-01-01T00:00:00Z Rocha, R. B. Soares, A. F. http://hdl.handle.net/10362/4918 2011-01-21T10:25:13Z 2007-01-01T00:00:00Z

Title: Serge Jean Marcel Elmi (1936 – 2007) Authors: Rocha, R. B.; Soares, A. F.

2007-01-01T00:00:00Z