Planificación multinivel eficiente con aprovisionamiento dinámico en grids y clouds

La consolidación de las grandes infraestructuras para la Computación Distribuida ha resultado en una plataforma de Computación de Alta Productividad que está lista para grandes cargas de trabajo. Los mejores exponentes de este proceso son las federaciones grid actuales. Por otro lado, la Computación Cloud promete ser más flexible, utilizable, disponible y simple que la Computación Grid, cubriendo además muchas más necesidades computacionales que las requeridas para llevar a cabo cálculos distribuidos. En cualquier caso, debido al dinamismo y la heterogeneidad presente en grids y clouds, encontrar la asignación ideal de las tareas computacionales en los recursos disponibles es, por definición un problema NP-completo, y sólo se pueden encontrar soluciones subóptimas para estos entornos. Sin embargo, la caracterización de estos recursos en ambos tipos de infraestructuras es deficitaria. Los sistemas de información disponibles no proporcionan datos fiables sobre el estado de los recursos, lo cual no permite la planificación avanzada que necesitan los diferentes tipos de aplicaciones distribuidas. Durante la última década esta cuestión no ha sido resuelta para la Computación Grid y las infraestructuras cloud establecidas recientemente presentan el mismo problema. En este marco, los planificadores (brokers) sólo pueden mejorar la productividad de las ejecuciones largas, pero no proporcionan ninguna estimación de su duración. La planificación compleja ha sido abordada tradicionalmente por otras herramientas como los gestores de flujos de trabajo, los auto-planificadores o los sistemas de gestión de producción pertenecientes a ciertas comunidades de investigación. Sin embargo, el bajo rendimiento obtenido con estos mecanismos de asignación anticipada (early-binding) es notorio. Además, la diversidad en los proveedores cloud, la falta de soporte de herramientas de planificación y de interfaces de programación estandarizadas para distribuir la carga de trabajo, dificultan la portabilidad masiva de aplicaciones legadas a los entornos cloud...

Realidad Aumentada en el Museo de Informática García Santesmases (MIGS++)

El principal objetivo del presente proyecto ha sido el desarrollo de una aplicación móvil de exploración aumentada para el Museo de Informática García Santesmases. Esta aplicación servirá para la inclusión de contenidos audiovisuales (imágenes, vídeo, texto) sobre las piezas existentes en el propio museo, aumentando la información que actualmente se puede observar en el museo.

Deposition of Intrinsic a-Si:H by ECR-CVD to Passivate the Crystalline Silicon Heterointerface in HIT Solar Cells

We have deposited intrinsic amorphous silicon (a-Si:H) using the electron cyclotron resonance (ECR) chemical vapor deposition technique in order to analyze the a-Si:H/c-Si heterointerface and assess the possible application in heterojunction with intrinsic thin layer (HIT) solar cells. Physical characterization of the deposited films shows that the hydrogen content is in the 15-30% range, depending on deposition temperature. The optical bandgap value is always comprised within the range 1.9- 2.2 eV. Minority carrier lifetime measurements performed on the heterostructures reach high values up to 1.3 ms, indicating a well-passivated a-Si:H/c-Si heterointerface for deposition temperatures as low as 100°C. In addition, we prove that the metal-oxide- semiconductor conductance method to obtain interface trap distribution can be applied to the a-Si:H/c-Si heterointerface, since the intrinsic a-Si:H layer behaves as an insulator at low or negative bias. Values for the minimum of D_it as low as 8 × 10^10 cm^2 · eV^-1 were obtained for our samples, pointing to good surface passivation properties of ECR-deposited a-Si:H for HIT solar cell applications.

Limitations of high pressure sputtering for amorphous silicon deposition

Amorphous silicon thin films were deposited using the high pressure sputtering (HPS) technique to study the influence of deposition parameters on film composition, presence of impurities, atomic bonding characteristics and optical properties. An optical emission spectroscopy (OES) system has been used to identify the different species present in the plasma in order to obtain appropriate conditions to deposit high purity films. Composition measurements in agreement with the OES information showed impurities which critically depend on the deposition rate and on the gas pressure. We prove that films deposited at the highest RF power and 3.4 × 10^−2 mbar, exhibit properties as good as the ones of the films deposited by other more standard techniques.

El surrealismo en la obra poética de Federico García Lorca

The main objective of this investigation is the retrieval of the study of possible Surrealism in Federico García Lorcás poetic work, a poet who enjoyed in his time prestige and international fame for decades, and still does. Numerous articles in magazines and newspapers of his time speak of his writings, literary activities and stand as a testimony of how well-regarded he was during his lifetime and even after his tragic murder death at the hands of fascists right after the outbreak of the Spanish civil war back in July 1936. Nevertheless, and for diverse reasons, literary ,social, as well as the extent of the studies, researches and abundant biographies about him, the study of Surrealism in all his works, such as in his playwrights for instance, has not been sufficiently expanded, and has been overlooked by the extensive bibliographies written about him. We have limited the investigation to his poetic works only. The extensive bibliographies written about him, is a fact that hindered and held back our efforts, as we had to resort to resources from different libraries, such as the Faculty of Philology of the UCM General Library, the Faculty of Information Science, the Student Residence, as well as the National Library. In addition to the analysis and commentary of his works, not to mention that current publications on him, various literary magazines and articles from the poet’s time have been consulted as well...

Edición y estudio del libro segundo de "La crónica de los muy valientes y esforçados e invencibles cavalleros don Florisel de Niquea..."

Los libros de caballerías castellanos suponen uno de los géneros más destacados y transcendentales del siglo XVI, por encima de otros que, aparentemente, tuvieron una enorme relevancia para sentar las bases de la narrativa moderna; nos referimos a la ficción pastoril, la picaresca, la sentimental o la bizantina. Señalamos como principio y origen del mismo la publicación de la primera edición del Amadís de Gaula de Garci Rodríguez de Montalvo, a partir de la versión primitiva medieval, en 1508. Tuvieron un éxito sin precedentes en la época, como lo corroboran los más de ochenta títulos que forman parte del corpus caballeresco y una difusión de casi dos siglos, desde finales del siglo XV hasta comienzos del siglo XVII, tanto de manera impresa como de forma manuscrita. Sin duda, podemos asegurar que eran los best-seller de la época, convirtiéndose en todo un fenómeno literario, con una notoriedad que traspasó nuestras fronteras peninsulares, tanto en Europa como en América. Prueba de ello son las numerosas traducciones que se hicieron en Italia, Francia, Alemania, Holanda, Inglaterra, Portugal e incluso hasta una versión hebrea del primer libro del Amadís de Gaula. En cuanto a su influencia en el Nuevo Mundo no podemos dejar de mencionar, a modo de curiosidad, cómo estos libros dejaron su huella a través de los conquistadores. Así, Magallanes llamó patagones a los aborígenes de la región austral de Sudamérica por influencia del Primaleón, del que deriva el topónimo Patagonia y Las Sergas de Esplandián, de Montalvo, fue fuente de inspiración para otros dos topónimos: California y Amazonas...

Insulator-to-metal transition in vanadium supersaturated silicon: variable-range hopping and Kondo effect signatures

We report the observation of the insulator-to-metal transition in crystalline silicon samples supersaturated with vanadium. Ion implantation followed by pulsed laser melting and rapid resolidification produce high quality single-crystalline silicon samples with vanadium concentrations that exceed equilibrium values in more than 5 orders of magnitude. Temperature-dependent analysis of the conductivity and Hall mobility values for temperatures from 10K to 300K indicate that a transition from an insulating to a metallic phase is obtained at a vanadium concentration between 1.1 × 10^(20) and 1.3 × 10^(21) cm^(−3) . Samples in the insulating phase present a variable-range hopping transport mechanism with a Coulomb gap at the Fermi energy level. Electron wave function localization length increases from 61 to 82 nm as the vanadium concentration increases in the films, supporting the theory of impurity band merging from delocalization of levels states. On the metallic phase, electronic transport present a dispersion mechanism related with the Kondo effect, suggesting the presence of local magnetic moments in the vanadium supersaturated silicon material.

En torno a la imagen literaria de Alfonso V de Aragón: Fortún García de Ercilla y su traducción castellana del De dictis de Antonio Beccadelli. Edición y estudio

Alfonso V of Aragon (1396-1458), who won from his contemporaries the title “the Magnanimous”, became one of the most brilliant fifteenth century monarchs, not only because of being a shrewd politician and king of one of the main kingdoms in the Iberian Peninsula, but also due to his cultural activity. Thanks to him the Aragonese territories were extended throughout the Mediterranean up to Naples, where he established a magnificent court that turned into maybe the most remarkable centre of intellectual vitality and development of Humanism. His patronage attracted a considerable number of leading poets of the period, as well as the most important Italian humanists. The presence of so many writers and outstanding scholars, together with the academic environment that the monarch encouraged, promoted an enormous literary production in four languages: Latin, Spanish, Catalan and Italian. Additionally, the valuable library gathered by the king and the Academy founded in order to spread knowledge illustrate part of his intellectual concerns. This way, through his love to literature and generosity to men of letters, Alfonso the Magnanimous boosted the culture of that time. The principal protagonist in the cultural activities of the circle of erudites formed around the sovereign was Antonio Beccadelli, called Panormita (1394-1471). He, one of the most prominent personalities of Italian Humanism, assumed the role of main royal advisor. His work De dictis et factis Alphonsi regis (The sayings and deeds of king Alfonso), which will be studied in our dissertation, became a very popular text about Alfonso’s personality, as a kind of biography based on anecdotes of the Magnanimous’ life by way of exempla to be imitated. The success of these episodes lasted for a long time and they are appreciated even nowadays. The work was valued as specula principum and had great impact in sixteenth century, when De dictis was republished several times and translated from Latin into Spanish. One of these translations, the one by Fortún García de Ercilla, caught our interest since it is in a manuscript signed by Ercilla himself and this version is still unpublished...

El teatro cómico de Enrique García Álvarez

Enrique García Álvarez (Madrid, 1883-1931) belonged to the group of writers who stood out in the late nineteenth century and early twentieth in what was known as “género chico”, label used to oppose this kind of theater to the dramaturgy considered serious. It was composed of brief and comic works whose intention was to generate a fun time for the spectators. Our author was one of the leading representatives and his numerous creations appeared profusely in the posters of the theaters per hour. In the twentieth century, he adapted to the new forms imposed on the scene. Despite his enormous fame at the time, nowadays Enrique García Álvarez remains completely unknown, not only in the eyes of the general public but also to the more knowledgeable circles of our literature. Studies of his dramatic work are almost nonexistent and basically limited to their collaborations with other authors who had more luck as Arniches or Muñoz Seca. The purpose of this thesis is, therefore, to complete a thorough study of the figure and production of Enrique García Álvarez, as well as its impact on the literature. The opening chapter is a reconstruction of the life and work of the author. In the following chapters, we proceeded to the analysis of structural features such as theme, time, space, and characters of his dramatic world. At the end of these pages, we have included a photographic appendix that illustrates some moments of his personal and professional career. We have also developed appendices to classify his librettos chronologically, by collaborator and by genre...