Moldes de fundición de las Edades del Bronce y del Hierro en la Submeseta Norte española

La presencia de un importante volumen de moldes de fundición en la Submeseta Norte evidencia una producción metalúrgica autóctona de cierta complejidad en un contexto que abarca desde las primeras etapas de la Edad del Bronce hasta la Primera Edad del Hierro. El presente artículo pretende complementar la panorámica de la metalurgia prehistórica en esta área peninsular a partir del análisis de estas evidencias y su evolución desde diferentes perspectivas.The presence of an important volume of castings moulds in the North Spanish Basin shows a complex autoctonal metalwork since the first stages of the Bronze Age to the First Iron Age. This article tries to complete a panoramic overview of the prehistoric metalwork in this peninsular area, trough the analyse of these evidence and it's evolution from different perspectives

Molecular Dynamics Simulations of Lead and Lithium in Liquid Phase

Pb17Li is today a reference breeder material in diverse fusion R&D programs worldwide. Extracting dynamic and structural properties of liquid LiPb mixtures via molecular dynamics simulations, represent a crucial step for multiscale modeling efforts in order to understand the suitability of this compound for future Nuclear Fusion technologies. At present a Li-Pb cross potential is not available in the literature. Here we present our first results on the validation of two semi-empirical potentials for Li and Pb in liquid phase. Our results represent the establishment of a solid base as a previous but crucial step to implement a LiPb cross potential. Structural and thermodynamical analyses confirm that the implemented potentials for Li and Pb are realistic to simulate both elements in the liquid phase

New simulations to qualify eutectic lithium-lead as breeder material

Pb17Li is today a reference breeder material in diverse fusion R&D programs worldwide. One of the main issues is the problem of liquid metals breeder blanket behavior. The knowledge of eutectic properties like optimal composition, physical and thermodynamic behavior or diffusion coefficients of Tritium are extremely necessary for current designs. In particular, the knowledge of the function linking the tritium concentration dissolved in liquid materials with the tritium partial pressure at a liquid/gas interface in equilibrium, CT =f(PT ), is of basic importance because it directly impacts all functional properties of a blanket determining: tritium inventory, tritium permeation rate and tritium extraction efficiency. Nowadays, understanding the structure and behavior of this compound is a real goal in fusion engineering and materials science. Atomistic simulations of liquids can provide much information; not only supplementing experimental data, but providing new tests of theories and ideas, making specific predictions that require experimental tests, and ultimately helping to a deeper understandin

Social catalogs: analysis in the Public Libraries of Castilla y León

Trabajo de Fin de Grado de Información y Documentación, curso 2016-2017[ES] Se realiza un proyecto de investigación sobre el grado de utilización de las características sociales del catálogo en línea de la Red de Bibliotecas Públicas de Castilla y León (RABEL) con el objetivo de conocer si este tipo de herramientas son realmente utilizadas por los usuarios o no. Para ello, incluye una recogida de datos minuciosa en las nueve bibliotecas principales de la Red así como un análisis claro y exhaustivo de los mismos. Finalmente se establecen una serie de recomendaciones, instrucciones y posibilidades de mejora que permitan fomentar la utilización de las herramientas sociales que presenta este catálogo por parte de sus principales usuarios. [EN] A project on the degree of use the social characteristics in the online catalog of the Network Public Libraries of Castilla y León (RABEL) is carried out to know if this type of tools are actually used by the users or not. For this, it includes a detailed data collection in the nine main libraries of the network as well as a clear and exhaustive analysis of the same. Finally, a series of recommendations, instructions and possibilities of improvement are established that allow to promote the use of the social tools presented in this catalog by its main users

Estudio del programa de Historia de España en las secciones bilingües del Ministerio Español en Polonia

Con el estudio del programa de Historia de España se pretende analizar el proceso de enseñanza-aprendizaje que se viene aplicando en las Secciones Bilingües de español en Polonia. A partir de mi experiencia docente, desde hace ya cuatro años, se tratará de evaluar entre otros aspectos, su funcionamiento, la valoración que realizan los estudiantes y el profesorado español que imparte esta materia, respecto al nivel de consecución de objetivos, los contenidos de enseñanza, la metodología que se viene aplicando en las aulas, los recursos que se emplean y el sistema de evaluación. Dicho estudio tiene como finalidad no sólo conocer los resultados en la aplicación de dicho programa, sino recoger de los propios participantes en el estudio, las propuestas de mejora con objeto de conseguir una mejor eficiencia en el cumplimiento de los objetivos previstos y en sus resultadosDepartamento de Didáctica de las Ciencias Experimentales, Sociales y de la Matemátic

Big Data en las bibliotecas universitarias y científicas

Trabajo de Fin de Máster en Sistemas de Información Digital, curso 2017-2018.[ES] Se realiza un trabajo de investigación sobre el grado de conocimiento e implantación del término Big Data y sus características principales en las bibliotecas universitarias y científicas españolas inscritas en REBIUN y el CSIC respectivamente, con el objetivo de observar si estas instituciones se encuentran capacitadas para el aprovechamiento de las ventajas proporcionadas por el tratamiento masivo de datos. Para ello, se realiza una recogida de datos a través de un cuestionario cuya respuesta proviene de fuentes de las diferentes bibliotecas. Por último, se establecen una serie de conclusiones junto a unas propuestas de mejora y líneas de trabajo futuras que permitan la correcta implantación, uso y aprovechamiento del Big Data en la oferta de servicios y funciones de las bibliotecas universitarias y científicas españolas. [EN] A research work is carried out on the degree of knowledge and implementation of the term Big Data and its main characteristics in the Spanish university and scientific libraries registered in REBIUN and the CSIC respectively, with the objective of observing if these institutions are qualified for the use of the advantages provided by the massive data processing. For this, a complete data collection is carried out through a questionnaire whose response comes from different library sources. Finally, a series of conclusions are established together a proposals for improvement and future lines of work that allow the correct implementation, use and exploitation of Big Data in the offer of services and functions of the Spanish university and scientific libraries.[EN] A research work is carried out on the degree of knowledge and implementation of the term Big Data and its main characteristics in the Spanish university and scientific libraries registered in REBIUN and the CSIC respectively, with the objective of observing if these institutions are qualified for the use of the advantages provided by the massive data processing. For this, a complete data collection is carried out through a questionnaire whose response comes from different library sources. Finally, a series of conclusions are established together a proposals for improvement and future lines of work that allow the correct implementation, use and exploitation of Big Data in the offer of services and functions of the Spanish university and scientific libraries

A General Asymmetric Formal Synthesis of Aza-Baylis–Hillman Type Products under Bifunctional Catalysis

This is the peer reviewed version of the following article: Chemistry A European Journal 24.13 (2018): 3117-3121, which has been published in final form at https://doi.org/10.1002/chem.201705218. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived VersionsWeinheim A new organocatalytic strategy for the synthesis of enantioenriched aza-Baylis–Hillman type products via a frustrated vinylogous reaction is presented. This process proceeds under mild conditions with good yields, completed Z/E selectivity and excellent enantioselectivities. Moreover, easy derivatizations of the final products led to important building blocks of organic synthesis such as 1,3-aminoalcohols and Lewis base catalystsFinancial support from the Spanish Government (CTQ2015-64561-R), the European Research Council (ERC-CG, contract number: 647550), is also gratefully acknowledge

Optimizing the Density of Holes of EWT Solar Cells Taking Into Consideration Mechanical Aspects

EWT solar cells start from drilled wafers with approximately 100 holes/cm2. These holes act as stress concentrators leading to a reduction in the mechanical strength of this type of wafers. The viability of cells with higher density of holes has been studied. To this end, sets of wafers with different density of holes have been characterized. The ring on ring test has been employed and FE models have been developed to simulate the test. The statistical evaluation permits to draw conclusions about the reduction of the strength depending on the density of holes. Moreover, the stress concentration around the holes has been studied by means of the FE method employing the sub-modeling technique. The maximum principal stress of EWT wafers with twice the density of holes of commercial ones is almost the same. However, the mutual interaction between the stress concentration effects around neighboring holes is only observed for wafers with a density of 200 holes/cm