Ediacaran Obduction of a Fore-Arc Ophiolite in SW Iberia: A Turning Point in the Evolving Geodynamic Setting of Peri- Gondwana

The Calzadilla Ophiolite is an ensemble of mafic and ultramafic rocks that represents the transition between lower crust and upper mantle of a Cadomian (peri-Gondwanan) fore arc. Mapping and structural analysis of the ophiolite demonstrates that it was obducted in latest Ediacaran times, because the Ediacaran-Early Cambrian sedimentary series (Malcocinado Formation) discordantly covers it. The ophiolite and emplacement-related structures are affected by Variscan deformation (Devonian-Carboniferous), which includes SW verging overturned folds (D1) and thrusts (D2), upright folds (D3), extensional faults (D4), and later faults (D5). These phases of deformation are explained in the context of Variscan tectonics as the result of the progressive collision between Gondwana and Laurussia. Qualitative unstraining of Variscan deformation reveals the primary geometry of Ediacaran-Cambrian structures and uncovers the generation of east verging thrusts as responsible for the primary obduction of the Calzadilla Ophiolite. Restoration of planar and linear structures associated with this event indicates an Ediacaran, east directed obduction of the ophiolite, that is, emplacement of the Cadomian fore arc onto inner sections of the northern margin of Gondwana. According to regional data, the obduction separates two extension-dominated stages in the tectonic evolution of the African margin of northern Gondwana preserved in southern Europe. Preobduction extension brought about the onset and widening of fore-arc and back-arc basins in the external part of the continent, while postobduction extension facilitated the formation of extensional migmatitic domes, an oceanward migration of back-arc spreading centers across peri-Gondwana, and the eventual opening of a major basin such as the Rheic Ocean

Uso del modelo EFQM como contraste del nivel de gestión de la calidad en los servicios deportivos municipales

The new demands of the users have pressed to the sports sector to undertake deep remodelings in his structures, being basic the quality in the service. In this study, it is evaluated, through the European Model of Excellence, the quality level of ten town halls of the Region of Murcia, with less than 10.000 inhabitants. The sample was formed by 66 workers, 41 men (62.1 %) and 25 women (37.9 %). The statistical techniques used were construct validity, confirmatory factorial analysis, reliability by Cronbach's alpha (.098), level of significance of p = .05. The profile of the sports services allows to know their strong points: key results 97 points (64.4 %) out of 150 of the model and their weak points: alliances and resources 45 points (50.3 %) out of 90 maximum of the model. Globally they obtained 580 points (57.1 %) out of the 1000 that could be reached, therefore their level of quality, according to the model, is acceptable.Las nuevas demandas de los usuarios han presionado al sector deportivo a emprender profundas remodelaciones en sus estructuras, siendo primordial la calidad en el servicio. En este estudio, se evalúa a través del Modelo Europeo de Excelencia el nivel de calidad de diez ayuntamientos de la Región de Murcia con menos de 10.000 habitantes. La muestra formada por 66 trabajadores, 41 hombres (62.1%) y 25 mujeres (37.9%). Validez de constructos análisis factorial confirmatorio, fiabilidad Alfa de Cronbach (.098), nivel de significación de p ≤.05. El perfil de los servicios deportivos permite conocer sus puntos fuertes: resultados clave 97 puntos (64.4%) sobre 150 del modelo y sus puntos débiles: alianzas y recursos 45 puntos (50.3%) de los 90 máximo del modelo. Globalmente consiguen 580 puntos (57.1%) de los 1000 que se pueden alcanzar, por lo que su nivel de calidad, según el modelo, es aceptable

Structural properties of various sodium thiogermanate glasses through DFT-based molecular dynamics simulations

We present a study of the structural properties of (x)Na$_2$S-(1-x)GeS$_2$ glasses through DFT-based molecular dynamics simulations, at different sodium concentrations ($0<x<0.5$). We computed the radial pair correlation functions as well as the total and partial structure factors. We also analyzed the evolution of the corner- and edge-sharing intertetrahedral links with the sodium concentration and show that the sodium ions exclusively destroy the former. With the increase of the sodium concentration the ``standard'' FSDP disappears and a new pre-peak appears in the structure factor which can be traced back in the Na-Na partial structure factor. This self organization of the sodium ions is coherent with Na-rich zones that we find at high modifier concentration.Comment: 9 pages, 7 figures; to be published in Phys. Rev.

A fog computing based cyber-physical system for the automation of pipe-related tasks in the Industry 4.0 shipyard

[Abstract] Pipes are one of the key elements in the construction of ships, which usually contain between 15,000 and 40,000 of them. This huge number, as well as the variety of processes that may be performed on a pipe, require rigorous identification, quality assessment and traceability. Traditionally, such tasks have been carried out by using manual procedures and following documentation on paper, which slows down the production processes and reduces the output of a pipe workshop. This article presents a system that allows for identifying and tracking the pipes of a ship through their construction cycle. For such a purpose, a fog computing architecture is proposed to extend cloud computing to the edge of the shipyard network. The system has been developed jointly by Navantia, one of the largest shipbuilders in the world, and the University of A Coruña (Spain), through a project that makes use of some of the latest Industry 4.0 technologies. Specifically, a Cyber-Physical System (CPS) is described, which uses active Radio Frequency Identification (RFID) tags to track pipes and detect relevant events. Furthermore, the CPS has been integrated and tested in conjunction with Siemens’ Manufacturing Execution System (MES) (Simatic IT). The experiments performed on the CPS show that, in the selected real-world scenarios, fog gateways respond faster than the tested cloud server, being such gateways are also able to process successfully more samples under high-load situations. In addition, under regular loads, fog gateways react between five and 481 times faster than the alternative cloud approach

Seasonality of picophytoplankton chlorophyll a and biomass in the central Cantabrian Sea, southern Bay of Biscay

Seasonal changes in the abundance and biomass of cyanobacteria (Synechococcus and Prochlorococcus) and picoeukaryotes were studied by flow cytometry in the upper layers of the central Cantabrian Sea continental shelf, from April 2002 to April 2006. The study area displayed the typical hydrographic conditions of temperate coastal zones. A marked seasonality of the relative contribution of prokaryotes and eukaryotes was found. While cyanobacteria were generally more abundant for most of the year (up to 2.4 105 cells mL− 1), picoeukaryotes dominated the community (up to 104 cells mL− 1) from February to May. The disappearance of Prochlorococcus from spring through summer is likely related to shifts in the prevailing current regime. The maximum total abundance of picophytoplankton was consistently found in late summer–early autumn. Mean photic-layer picoplanktonic chlorophyll a ranged from 0.06 to 0.53 µg L− 1 with a relatively high mean contribution to total values (33 ± 2% SE), showing maxima around autumn and minima in spring. Biomass (range 0.58–40.16 mg C m− 3) was generally dominated by picoeukaryotes (mean ± SE, 4.28 ± 0.27 mg C m− 3) with an average contribution of cyanobacteria of 30 ± 2%. Different seasonality of pigment and biomass values resulted in a clear temporal pattern of picophytoplanktonic carbon to chlorophyll a ratio, which ranged from 10 (winter) to 140 (summer). This study highlights the important contribution of picoplanktonic chlorophyll a and carbon biomass in this coastal ecosystem.Versión del edito

Efectos de un programa de actividad física en la imagen corporal de escolares con tdah

Este artículo se centra en estudiar los efectos de un programade actividad física sobre la imagen corporal de un grupo de escolares conTDAH. Han participado 12 escolares (12 niños), entre los 7 y los 12 años deedad. La imagen corporal se ha medido mediante las siluetas de Stunkard.El procedimiento ha sido: pre-test, intervención y pos-test. La intervenciónha consistido en 2 días a la semana de actividad física, 60 minutos al día,durante 12 semanas. Se han producido mejoras significativas en la imagencorporal (p=0,039). El programa utilizado es eficaz para mejorar la imagencorporal de niños con TDAH