710 resultados para DÍAZ ORTIZ, JUAN SEBASTIÁN


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Mode of access: Internet.

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Mode of access: Internet.

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En algunos ejemp., t. I también con fecha 1830 en port.

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Special t.-p.: Apuntes históricos sobre las agresiones del dictador argentino D. Juan Manuel Rosas contra la independencia de la República Oriental del Uruguay. Artículos escritos en 1845 para el Nacional de Montevideo ... 1828 á 1838.

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El Caribe ha sido reconocido por considerarse una pluralidad de espacios que simultáneamente son solo uno. Contrario al contexto de su fragmentada geografía, su segregada historia colonial y su diversidad racial y lingüística, los intelectuales caribeños han establecido puentes de unidad cultural con la intención de configurar una identidad pan-caribeña. Por consiguiente, los ensayistas del siglo XX se enfrentan a la necesidad de examinar críticamente los factores que formulan sus respectivas identidades, en contraste con aquellas tradicionalmente impuestas bajo el discurso colonial y metropolitano. Desde el tercer cuarto del siglo, pensadores como Aimé Césaire (1913-2008), Fernando Ortiz (1881-1969), Fidel Castro (1926-), George Lamming (1927-), Kamau Brathwaite (1930-), Juan I. Jiménes-Grullón (1903-1983), Hubert Devonish (1953-), Edouard Glissant (1928-2011), Antonio Benítez-Rojo (1931-2005), Arcadio Díaz Quiñones y Maryse Condé (1937-), entre otros, cuestionan el sistema colonial, los procesos étnicos y las propuestas lingüísticas, relacionándolos con conceptos tales como la hibridez, el sincretismo, la transculturación y la heterogeneidad. Estas teorías culturales, de alguna manera, reescriben ideas antecedentes en reacción a discursos hegemónicos previos como consecuencia de los cambios políticos que trajeron las guerras de independencia en América Latina durante el siglo XIX. En mi tesis demuestro que estos planteamientos delinean un mapa de modelos epistemológicos de la cultura del Caribe. Para indicar que estas propuestas constituyen metáforas que muestran una consciencia cultural, las proposiciones acerca de la cultura de Jorge Luis Borges (1899-1986) y Hayden White (1928-) sirven como marco teórico apropiado. Así, a través de las representaciones literarias ensayísticas de los modelos metafóricos de la cultura caribeña, este trabajo redefine algunos aspectos importantes de la identidad cultural vis a vis la mirada parcial que usualmente se utiliza para estudiar el archipiélago antillano. Igualmente, incluso aunque estos modelos proponen una representación metafórica de la cultura pan-caribeña, la construcción de un modelo del Caribe puede ser utilizado en otras regiones y espacios culturales en el contexto de la globalización, ya que elucida una gnoseología cultural que sirve para describir distintas realidades globales.

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Previous studies about the strength of the lithosphere in the Iberia centre fail to resolve the depth of earthquakes because of the rheological uncertainties. Therefore, new contributions are considered (the crustal structure from a density model) and several parameters (tectonic regime, mantle rheology, strain rate) are checked in this paper to properly examine the role of lithospheric strength in the intraplate seismicity and the Cenozoic evolution. The strength distribution with depth, the integrated strength, the effective elastic thickness and the seismogenic thickness have been calculated by a finite element modelling of the lithosphere across the Central System mountain range and the bordering Duero and Madrid sedimentary basins. Only a dry mantle under strike-slip/extension and a strain rate of 10-15 s-1, or under extension and 10-16 s-1, causes a strong lithosphere. The integrated strength and the elastic thickness are lower in the mountain chain than in the basins. These anisotropies have been maintained since the Cenozoic and determine the mountain uplift and the biharmonic folding of the Iberian lithosphere during the Alpine deformations. The seismogenic thickness bounds the seismic activity in the upper–middle crust, and the decreasing crustal strength from the Duero Basin towards the Madrid Basin is related to a parallel increase in Plio–Quaternary deformations and seismicity. However, elasto–plastic modelling shows that current African–Eurasian convergence is resolved elastically or ductilely, which accounts for the low seismicity recorded in this region.

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Fossil associations from the middle and upper Eocene (Bartonian and Priabonian) sedimentary succession of the Pamplona Basin are described. This succession was accumulated in the western part of the South Pyrenean peripheral foreland basin and extends from deep-marine turbiditic (Ezkaba Sandstone Formation) to deltaic (Pamplona Marl, Ardanatz Sandstone and Ilundain Marl formations) and marginal marine deposits (Gendulain Formation). The micropalaeontological content is high. It is dominated by foraminifera, and common ostracods and other microfossils are also present. The fossil ichnoasssemblages include at least 23 ichnogenera and 28 ichnospecies indicative of Nereites, Cruziana, Glossifungites and ?Scoyenia-Mermia ichnofacies. Body macrofossils of 78 taxa corresponding to macroforaminifera, sponges, corals, bryozoans, brachiopods, annelids, molluscs, arthropods, echinoderms and vertebrates have been identified. Both the number of ichnotaxa and of species (e. g. bryozoans, molluscs and condrichthyans) may be considerably higher. Body fossil assemblages are comparable to those from the Eocene of the Nord Pyrenean area (Basque Coast), and also to those from the Eocene of the west-central and eastern part of South Pyrenean area (Aragon and Catalonia). At the European scale, the molluscs assemblages seem endemic from the Pyrenean area, although several Tethyan (Italy and Alps) and Northern elements (Paris basin and Normandy) have been recorded. Palaeontological data of studied sedimentary units fit well with the shallowing process that throughout the middle and late Eocene occurs in the area, according to the sedimentological and stratigraphical data.

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As a result of a floristic survey carried out in riparian habitats of northern Spain, new chorological data are provided for 9 alien and 6 native plant species. Some species are reported for the first time at regional scale, such as Carex strigosa, Helianthus x laetiflorus and Persicaria pensylvanica in Cantabria. Also noteworthy is the finding of naturalised populations of the North American grass Muhlenbergia schreberi at the Urumea river basin, which represents the second reference for the Iberian Peninsula.