A two particle hidden sector and the oscillations with photons

We present a detailed study of the oscillations and optical properties for vacuum, in a model for the dark sector that contains axion-like particles and hidden photons. In this model, both can couple to photons. We provide bounds for the couplings versus the mass, using current results from ALPS-I and PVLAS. We also discuss the challenges for the detection of models with more than one hidden particle in light shining trough wall-like experiments.Comment: 23 pages, 7 figures. Figures are coloure

Hydrogeological model of Mijas mountain aquifers under different climate conditions (Málaga, Spain)

Carbonate aquifers represent an important source of freshwater, both for urban and agricultural uses. This is particularly true in semiarid regions, where intensive pumping has often led to aquifer overexploitation. One example is the Mijas mountain carbonate diffuse flow system (80 km2), located to the SW of the city of Malaga, Spain. From a geolo-gical standpoint, this area consists of Triassic dolomitic and calcareous rocks, which overlay Palaeozoic metapelites. The geological structure is formed by ESE-WNW folds and the me-tapelites anticlinal cores have divided the study area into four aquifer systems. The recharge of Mijas mountain aquifers comes from direct infiltration of rainfall, while pumping is the main discharge. To improve the knowledge of geological and hydrodynamic parameters, and therefore to improve water resources management, a hydrogeological model has been developed with Processing Modflow 8.0.42. Piezometric level and spring flows have been modelled, under steady and transient-flow conditions for a 35-year period. Five future scenarios were simulated for different rainfall and pumping conditions. Outcomes confirm that the water level evolution is determined by the quantity and distribution of rainfall during the hydrological year, with the same pumping rate. The results also suggest that current trends are likely to raise sustainability issues in the future.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Linguistic and cultural crisis in Galicia, Spain.

To truly understand Spain, one must have more than just a basic knowledge of the country\u27s physical features or general traditions. If one investigates further into the history of ethnology of the name that is Spain, one discovers an intricate network of individual worlds that somehow revolve around one center, Madrid. Each patria chica or miniature country is a product of its location within the Peninsula, and each conserves its own institutions, values, and idiosyncracies. Today, the autonomous regions of Spain maintain and cherish their individuality with a certain degree of liberty thanks to the Constitution of 1978. Soon after the Reconquest of Iberia, the Catholic Sovereigns attained the unity of Spain. Consequently, the Castilian dialect of Latin became the official language of Spain and its overseas territories. The central power of Castile began its persecution of the regions. Castile succeeded greatly in homogenizing Spain by suppressing the very source of identity of its ethnic peoples--language. The installation of the Castilian language marked a new era in Spanish history. The linguistic supremacy of Castilian effectively arrested the cultural growth of the atrias chicas until very recently. Ample evidence of this is the virtual loss of the Leonese, Aragonese, Asturian, Navarrese, and Andalusian dialects of Latin along with the 400-year-old dialectalization of the Galician, Catalan, and Basque languages. Castilian dominance of Spain greatly degraded the state of education in Catalonia, Euzkadi, and Galicia. Not only did people from these regions lose an enormous part of their heritage, but Galicia, in particular, became the unwilling victim of generations of illiteracy and poverty. The year 1975 has come to represent the renaissance of the ethnic Spanish regions. Today, the historic autonomies of Spain can finally step out of the Castilian shadow and rediscover their pasts. One objective for them is certain--they must place their own languages at the forefront of their efforts to preserve their cultures. Their languages are their past, present, and future. Just how they will use them in this age of increasing global unity may make the future an interesting new era in Spain\u27s history

Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential

The ground state and spectral properties of Bose gases in double-well potentials are studied in two different scenarios: i) an interacting atomic Bose gas, and ii) a mixture of an atomic gas interacting with diatomic molecules. A ground state second-order quantum phase transition (QPT) is observed in both scenarios. For large attractive values of the atom-atom interaction, the ground-state is degenerate. For repulsive and small attractive interaction, the ground-state is not degenerate and is well approximated by a boson coherent state. Both systems depict an excited state quantum phase transition (ESQPT). For the mixed atom-molecule system the critical point of the ESQPT displays a discontinuity in the first derivative of the density of states.Comment: 25 pages, 18 figures. RevTex 4.1 (version to appear in Phys. Rev. E

Cambios en elrango de distribución dePotentilla tucumanensis (Rosaceae), una especie críptica en peligro de extinción

Una correcta identificación taxonómica es esencial para la preservación de la biodiversidad. En este trabajo se presentan caracteres morfológicos sencillos para diferenciar la nueva especip, Potentilla tucumanensis recientemente descripta. Esta especie, cuyo período reproductivo ocupa el 10% final de su ciclo de vida, es considerada críptica debido a que puede ser confundida por su similitud en estado vegetativo, con especies con las cuales cohabita y está aislada reproductivamente. Además, se muestra que en los últimos cien años, P. tucumanensis ha sufrido una dramática retracción de su hábitat: desde 1900 a 1925 se encontraron ejemplares de esta planta distribuidos en diferentes ambientes ecológicos de la reglón del noroeste argentino, mientras que en la actualidad, esta especie es raramente encontrada y siempre confinada a un sólo tipo de hábitat. Se discuten las posibles causas de este proceso de retracción. Si P. tucumanensis no hubiese sido reconocida como una especie nueva, probablemente hubiese desaparecido sin dejar rastro de su existencia.: A correct taxonomic identification is essential for the preservation of biodiversity. In this paper we present simple morphological characters for the identification of the new species recently described, Potentilla tucumanensis. The reproductive period of this species occupies about 10% of the last part of its lifecycle, is considered cryptic because in the vegetative stage it has many morphological similarities with other cohabiting related species; it can be easily confused with them and it is reproductively isolated. Our study also revealed that for the last hundred years P. tucumanensis has suffered a dramatic habitat retraction. Possible causes of this area retraction are discussed. IfPtucumanensis had not been recognized asa new species, it would have most likely disappeared without being noticed.Fil: Arias, Marta Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; ArgentinaFil: Diaz Ricci, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaFil: Castagnaro, Atilio Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentin

Actuación de tutores en un programa de formación de postgrado para profesores de matemáticas

Este estudio trata sobre la caracterización de la actuación de tutores en un programa de formación de postgrado para profesores de matemáticas. El programa contexto de la investigación, esta implementado en una modalidad de aprendizaje híbrido y los profesores en formación construyen los conocimientos sobre los organizadores del currículo –significado, uso técnico y uso práctico– y lo hacen cuando diseñan, implementan y evalúan una unidad didáctica sobre un tema de matemáticas escolares. Construimos una estructura de categorías y códigos conjugando una revisión de literatura, una visión del aprendizaje de los organizadores del currículo y los datos referidos a los comentarios escritos de los tutores a los trabajos de su grupo de tutorandos. Realizamos dos tipos de análisis: descriptivo y clúster. El primer análisis nos ha permitido caracterizar la actuación de los tutores por niveles de generalidad de acuerdo a la estructura de categorías y códigos propuesta, además de caracterizar el núcleo común de las actuaciones de los tutores en relación con sus comentarios escritos. Con el segundo análisis nos aproximamos a un conjunto de perfiles de tutores con base en sus diferencias y similitudes. La realización de este tipo de investigaciones da lugar a estudios de carácter explicativos, donde el análisis de la actuación de los tutores adquiere importancia cuando se tiene en cuenta para establecer su relación con los procesos de aprendizaje de los profesores en formación

Hacia una justicia victimal

[ES] Dedicatoria y reflexión realizada con razón del Encuentro Internacional en homenaje de Antonio Beristain Ipiña.[EU] Bilera Internazionala izanda eta, Antonio Beristain Ipiñarekiko omenaldia

Characterizing mentors’ performance in mathematics teacher education

This study describes the performance of the mentors in a blended graduate-level training program of teachers in the field of secondary school mathematics. We codified and analyzed the mentors’ comments on the projects presented by the groups of in-service teachers for whom they (the mentors) were responsible. To do this, we developed a structure of categories and codes based on a combination of a literature review, a model of teacher learning, and a cyclical review of the data. We performed two types of analysis: frequency and cluster. The first analysis permitted us to characterize the common actions shared by most of the mentors. From the second, we established three profiles of the mentors’ actions

A beyond mean field study of Bose gases in a double-well potential with a Feshbach resonance

The Bose-Hubbard model coupled to a Feshbach resonance is studied. Quantum phase transitions are analyzed within a beyond mean field framework in order to get finite size corrections to the simple mean field approach. Analytical results for the ground state energy and the first few energy gaps are presented

Núcleo común y perfiles de la actuación de tutores de profesores de matemáticas en formación

En este trabajo caracterizamos la actuación de los tutores en un programa híbrido de formación de postgrado para profesores de matemáticas de secundaria en ejercicio. Construimos una estructura de categorías y códigos conjugando una revisión de literatura, una visión del aprendizaje de los profesores en formación y una revisión cíclica de los datos. Con base en esta estructura, codificamos y analizamos los comentarios de los tutores a los trabajos de los grupos de profesores en formación a su cargo. El análisis de las frecuencias de los códigos nos permitió caracterizar el núcleo común de las actuaciones de los tutores. Establecimos tres perfiles de esa actuación a partir de un análisis clúster de los datos