Gravitational waves from a Weyl-Integrable manifold: a new formalism

We study the variational principle over an Hilbert-Einstein like action for an extended geometry taking into account torsion and non-metricity. By extending the semi-Riemannian geometry, we obtain an effective energy-momentum tensor which can be interpreted as physical sources. As an application we develop a new manner to obtain the gravitational wave equations on a Weyl-integrable manifold taking into account the non-metricity and non-trivial boundary conditions on the minimization of the action, which can be identified as possible sources for the cosmological constant and provides two different equations for gravitational waves. We examine gravitational waves in a pre-inflationary cosmological model.Comment: Accepted in Physics of the Dark Univers

The art of the embroidery in Santiago de Compostela. New information on embroiderers of the 16th and 17th centuries

En este artículo se aportan nuevos datos de bordadores compostelanos de los siglos XVI y XVII. Se incluyen noticias relacionadas con la vida de estos artífices y con la producción artística de los mismos, es decir, contratos, conciertos, etc. Es el resultado de un minucioso trabajo de investigación en el archivo de la Catedral de Santiago de Compostela y en el Histórico Universitario de la misma ciudad. Con ello pretendemos profundizar en esta parcela de la historia del arte gallega por muchos olvidada y marcar un punto de partida a futuras investigacionesIn this article there is contributed new information from Santiago de Compostela embroiderers of the 16th and 17th century. There includes news related to the life of these makers and to the artistic production of the same ones, that is to say, contracts, concerts, etc. It is the result of a meticulous work of investigation in the file of the Cathedral of Santiago de Compostela and in the Historical University of the same city. With it we try to penetrate into this plot of the Galician history of the art for many forgotten and to mark a point of item to future investigations

El antiguo terno de difuntos de la Catedral de Santiago de Compostela (1561-1563), obra del bordador vallisoletano Hernando de Saldaña

En el presente artículo damos a conocer un documento conservado en el Archivo de la Catedral de Santiago de Compostela donde se constata la realización de un temo de difuntos por parte del bordador vallisoletano Hernando de Saldaña. Asimismo analizamos la capa pluvial del citado conjunto, única pieza conservada.In this article we present a document preserved in the records of the Cathedral of Santiago de Compostela where he finds conducting a suit for the dead by the embroiderer of Valladolid Hernando de Saldaña. It then discusses the cope of that parcel, the only part preserved

The ancient suit for the dead of the Catedral of Santiago de Compostela( 1561-1563) by Hernando de Saldaña, embroiderer of Valladolid

En el presente artículo damos a conocer un documento conservado en el Archivo de la Catedral de Santiago de Compostela donde se constata la realización de un terno de difuntos por parte del bordador vallisoletano Hernando de Saldaña. Asimismo analizamos la capa pluvial del citado conjunto, única pieza conservada.In this article we present a document preserved in the records of the Cathedral of Santiago de Compostela where he finds conducting a suit for the dead by the embroiderer of Valladolid Hernando de Saldaña. It then discusses the cope of that parcel, the only part preserved

Formação e desenvolvimento do conceito de justiça educacional na Argentina

En este texto se presenta un análisis del itinerario del concepto de justicia educativa en Argentina en la transición del siglo XXI. A partir de una perspectiva apoyada en el análisis conceptual de los discursos, la historia conceptual y en planteamientos sobre la externalización del enfoque de educación comparada, se analiza la producción académica y oficial. Se plantea que la emergencia del concepto de justicia educativa se explica, entre otras razones, debido a las crecientes desigualdades sociales y en el campo educativo, así como a los procesos de externalización de los discursos nacionales, que han propiciado una hibridación original, que forma parte de una historia conceptual a distintas escalas que está por hacerse. Se concluye que el concepto de justicia educativa implica una doble dimensión: como descripción de cierto campo de experiencia y más enfáticamente como un horizonte optimista de expectativas sobre la mejora de las escuelas, las relaciones educativas, los sistemas escolares y las comunidadesThis paper presents an analysis of the itinerary of the concept of educational justice in Argentina in the turn of the 21st century. From a perspective based in conceptual history, the academic and official productions are analyzed using approaches to externalization from comparative education and conceptual analysis of discourse. It is argued that the emergence of the concept of educational justice is explained mainly by growing social inequalities and inequalities in the field of education, and by the externalization of national discourses, which have led to an original hybridization, as part of conceptual history at multi scale that is yet to be done. It is concluded that the concept of educational justice has a dual dimension: a description of certain field experience and, more strongly, an optimistic horizon of expectations concerning the improvement of schools, educational relationships, school systems, and communitiesNeste trabalho é feita uma análise do itinerário do conceito de justiça educacional na Argentina na transição do século XXI A partir de uma perspectiva conceitual apoiado em análise do discurso, história e abordagens conceptuais sobre a abordagem de terceirização na educação comparada, produção acadêmica e oficial é analisada. Ele argumenta que o surgimento do conceito de justiça educacional explicado, entre outras razões, devido às crescentes desigualdades sociais e da educação, bem como processos de terceirização dos discursos nacionais, o que levou à hibridização original, que é parte de uma história conceitual em diferentes escalas é para ser feito. Conclui-se que o conceito de justiça educativa implica duas dimensões: uma descrição de alguma experiência de campo e mais enfaticamente como um horizonte otimista das expectativas em escolas, melhorando as relações educacionais, sistemas de ensino e comunidade

Ornamentos de Miguel Gregorio Molero en el Museo Nacional de Artes Decorativas

La fábrica de Miguel Gregorio Molero, especializada en ornamentos litúrgicos, fue una de las manufacturas sederas más importantes con las que contó la ciudad de Toledo en los siglos XVIII y XIX. En este trabajo presentamos y estudiamos varias piezas conservadas en el Museo Nacional de Artes Decorativas pertenecientes al citado taller

Improving the Evolutionary Coding for Machine Learning Tasks

The most influential factors in the quality of the solutions found by an evolutionary algorithm are a correct coding of the search space and an appropriate evaluation function of the potential solutions. The coding of the search space for the obtaining of decision rules is approached, i.e., the representation of the individuals of the genetic population. Two new methods for encoding discrete and continuous attributes are presented. Our “natural coding” uses one gene per attribute (continuous or discrete) leading to a reduction in the search space. Genetic operators for this approached natural coding are formally described and the reduction of the size of the search space is analysed for several databases from the UCI machine learning repository.Comisión Interministerial de Ciencia y Tecnología TIC1143–C03–0