O presente trabalho, resultado das pesquisas do Grupo de Morfologia Histórica do Português, procura estudar os aspectos semânticos do sufixo -ista no português e no galego, baseando-se na afirmação de VIARO (2005), segundo a qual a semântica da base é diferente da semântica do sufixo e da semântica da palavra formada pela derivação com este, e ressaltando, que não necessariamente a semântica da palavra formada é a soma das semânticas do sufixo e base. Desde esta ótica, traça-se, inicialmente, um panorama histórico e um mapeamento geral da semântica das palavras derivadas com o sufixo proveniente da terminação grega -#953;στης em várias línguas, e, posteriormente, faz-se um estudo em corpora das línguas portuguesa e galega, propondo-se uma classificação semântica das palavras formadas com o sufixo -ista, a qual, detalhada por perspectivas históricas e etimológicas, conduz a uma classificação semântica do sufixo -ista, no português e no galego. / The present work, which is the result of the researches carried out by the Grupo de Morfologia Histórica do Português [\"Group of Historical Morphology of the Portuguese Language\"], studies the semantic aspects of the suffix -ista, in Portuguese and Galician, based on VIARO\'s (2005) assertion, according to which the base semantics is different from the suffix semantics and also different from the semantics of the word formed by the derivation with this suffix, and the semantics of the word formed isn\'t necessarily the sum of the base semantics with the suffix semantics. From this standpoint, we initially draw a historical overview and a general map of the semantics of the words derived with the suffix originating from the Greek ending -ιστης, in several languages. Based on an analysis of the Portuguese corpora and the Galician corpora, we subsequently propose a semantic classification of the words formed by the suffix -ista, which, after providing a detailed historical and etymological perspective, leads to a semantic classification of the suffix -ista, in the Portuguese and Galician languages.

O presente trabalho, resultado das pesquisas do Grupo de Morfologia Histórica do Português, procura estudar os aspectos semânticos do sufixo -ista no português e no galego, baseando-se na afirmação de VIARO (2005), segundo a qual a semântica da base é diferente da semântica do sufixo e da semântica da palavra formada pela derivação com este, e ressaltando, que não necessariamente a semântica da palavra formada é a soma das semânticas do sufixo e base. Desde esta ótica, traça-se, inicialmente, um panorama histórico e um mapeamento geral da semântica das palavras derivadas com o sufixo proveniente da terminação grega -#953;στης em várias línguas, e, posteriormente, faz-se um estudo em corpora das línguas portuguesa e galega, propondo-se uma classificação semântica das palavras formadas com o sufixo -ista, a qual, detalhada por perspectivas históricas e etimológicas, conduz a uma classificação semântica do sufixo -ista, no português e no galego. / The present work, which is the result of the researches carried out by the Grupo de Morfologia Histórica do Português [\"Group of Historical Morphology of the Portuguese Language\"], studies the semantic aspects of the suffix -ista, in Portuguese and Galician, based on VIARO\'s (2005) assertion, according to which the base semantics is different from the suffix semantics and also different from the semantics of the word formed by the derivation with this suffix, and the semantics of the word formed isn\'t necessarily the sum of the base semantics with the suffix semantics. From this standpoint, we initially draw a historical overview and a general map of the semantics of the words derived with the suffix originating from the Greek ending -ιστης, in several languages. Based on an analysis of the Portuguese corpora and the Galician corpora, we subsequently propose a semantic classification of the words formed by the suffix -ista, which, after providing a detailed historical and etymological perspective, leads to a semantic classification of the suffix -ista, in the Portuguese and Galician languages.

Geólogo / Isla de Pascua es una isla oceánica ubicada sobre la Placa de Nazca, en el borde occidental de la Dorsal Asísmica de Pascua. Está generada a partir de un hotspot del cual se discute su posición. Esta isla se encuentra a aproximadamente 350 km al este del Eastern Pacific Rise (EPR) y la Microplaca de Pascua. La isla posee un alineamiento de estructuras en dirección NE-SW. Sin embargo, no se sabe la causa de este alineamiento. El presente trabajo pretende encontrar, mediante el estudio de datos sismológicos y modelación de esfuerzos, las causas tectónicas para el alineamiento de estructuras presentes en la isla, y crear un modelo general de formación de ésta. Además, se pretende estudiar la presencia de movimiento magmático actual bajo la isla. Para esto, se analizaron datos sismológicos de la estación VA02 de dos años, en busca de sismos volcánicos y tectónicos. También, se analizaron datos de mecanismo de foco de sismos catalogados por el Centroid Moment Tensor Project (CMT) y United States Geological Survey (USGS) para encontrar posibles fallas y caracterizar el movimiento de la litósfera. Finalmente, se utilizó la información obtenida de dichos datos para generar un modelo tectónico y analizar los esfuerzos traspasados desde la EPR a la Placa de Nazca, utilizando el software COMSOL Multiphysics . Al observar los datos de mecanismo focal de la Microplaca de Pascua, se puede establecer una primera aproximación para caracterizar la posición, rumbo y movimiento de las dorsales oceánicas de dicha placa, los cuales difieren de Bird (2003). Analizando los mecanismos focales en la región cercana a la isla, se muestra una zona de extensión de dirección NW-SE sobre Isla de Pascua, la cual concuerda con lo descrito anteriormente por Vezzoli & Acocella (2009). Esta extensión se debería a fallas creadas durante la formación de la corteza al pasar por una zona de esfuerzos extensionales, y que permanecen activas en la actualidad. Estas fallas serían aprovechadas por esfuerzos creados sobre la corteza a raíz de un levantamiento termal producido por la Pluma de Pascua para crear un rifting activo en la zona, el cual daría lugar a la extrusión de magma para la formación de Isla de Pascua. Actualmente, no existe una pluma mantélica en la zona somera cercana a la isla (Zhao, 2007), por lo que la isla estaría pasando por un proceso de subsidencia termal y un consiguiente rifting pasivo, lo que explicaría la presencia de sismos de tipo extensional en la región en la actualidad.

Frank Dobbins in memoriam In 1976 Louise Litterick proposed that Cambridge, Magdalene College, Pepys Library MS 1760 was originally prepared for Louis XII and Anne of Brittany of France but was gifted to Henry VIII of England in 1509. That the manuscript actually was prepared as a wedding gift from Louis to his third wife Mary Tudor in 1514, however, is indicated by its decorative and textual imagery, which mirrors the decoration of a book of hours given by Louis to Mary and the textual imagery used in her four royal entries. Analysis of the manuscript’s tabula and texts suggests that MS 1760 was planned by Louis’s chapelmaster Hilaire Bernonneau (d. 1524) at the king’s behest. The new theory elucidates the content and significance of Gascongne’s twelve-voice canon Ista est speciosa, which appeared beneath an original portrait of Mary Tudor and was intended to mirror the perfection of the Blessed Virgin and her ‘godchild’ Mary.

This thesis presents the mathematical analysis of a continuous-times system for sparse signal recovery. Sparse recovery arises in Compressed Sensing (CS), where signals of large dimension must be recovered from a small number of linear measurements, and can be accomplished by solving a complex optimization program. While many solvers have been proposed and analyzed to solve such programs in digital, their high complexity currently prevents their use in real-time applications. On the contrary, a continuous-time neural network implemented in analog VLSI could lead to significant gains in both time and power consumption. The contributions of this thesis are threefold. First, convergence results for neural networks that solve a large class of nonsmooth optimization programs are presented. These results extend previous analysis by allowing the interconnection matrix to be singular and the activation function to have many constant regions and grow unbounded. The exponential convergence rate of the networks is demonstrated and an analytic expression for the convergence speed is given. Second, these results are specialized to the L1-minimization problem, which is the most famous approach to solving the sparse recovery problem. The analysis relies on standard techniques in CS and proves that the network takes an efficient path toward the solution for parameters that match results obtained for digital solvers. Third, the convergence rate and accuracy of both the continuous-time system and its discrete-time equivalent are derived in the case where the underlying sparse signal is time-varying and the measurements are streaming. Such a study is of great interest for practical applications that need to operate in real-time, when the data are streaming at high rates or the computational resources are limited. As a conclusion, while existing analysis was concentrated on discrete-time algorithms for the recovery of static signals, this thesis provides convergence rate and accuracy results for the recovery of static signals using a continuous-time solver, and for the recovery of time-varying signals with both a discrete-time and a continuous-time solver.

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