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Structural characterization and barrier properties of hybrid sol-gel films applied on tinplate
No full textSeveral hybrid sol-gel formulations applied on tinplate were studied. The organic precursor was vinyltrimethoxysilane (VTMS) and the inorganic one was tetraethylorthosilane (TEOS). The characterization was performed by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and Fourier Transform Infrared Spectroscopy (FTIR). The optimization of the curing parameters was made by kinetics analysis based on Differential Scanning Calorimetry (DSC) measurements. The barrier properties were evaluated by Electrochemical Impedance Spectroscopy (EIS) technique. The results indicated that only sol-gel solutions with high inorganic precursor ratios are able to form a continuous film, necessary to provide good barrier properties. Thus, tinplate coated with 25% VTMS and 75% TEOS formulation exhibited the better protection properties in the studied medium
Mar Caldas. Argaceira (serie Facedoras do Baixo Miño)
No full textARGACEIRA (SERIE FACEDORAS DO BAIXO MIÑO). Fotografía dixital. Impresión con tintas minerais K3, montaxe sobre Dibond e enmarcado en madeira 120 x 110 c
Los puntos de conexión del Impuesto sobre Sucesiones y Donaciones en el Concierto Económico
No full text[Inicio] El presente trabajo tiene como objeto un estudio de los. puntos de conexión del impuesto sobre Sucesiones y Donaciones en la Ley del Concierto Económico, incidiendo
en las modificaciones, de gran calado, operadas por la Ley 10/2017 de 28 de diciembre, dirigidas a adecuar la normativa reguladora de los referidos puntos de conexión a
las exigencias del mercado interior.
A tal efecto, se explicará, en primer lugar, el origen de la problemática de la normativa anterior en relación con el mercado interior, y se reflexionará sobre si la solución
adoptada es suficiente. Además, se plantearán algunos problemas de otra naturaleza
que presentan los puntos de conexión en el Impuesto sobre Sucesiones y Donaciones
en la Ley del Concierto Económico.
Finalmente, se realizarán unas reflexiones finales a modo de comparación entre el
modo en que el legislador vasco ha afrontado el problema referido y el modo en que lo
ha hecho el legislador español, concluyendo que el respeto al Derecho de la Unión es
posible, aun en un Estado descentralizado como el nuestro. [...
La circulación de modelos en los paisajes del románico de Galicia: de Compostela a la Ribeira Sacra
Get PDFBernardo II y la memoria de la Compostela medieval
No full textEl Arzobispado de Santiago desarrolló a lo largo de 2025 un proyecto de investigación, conservación y puesta en valor de la figura del arzobispo Bernardo II, retirado al priorato de Sar, donde fue enterrado tras su fallecimiento en el año 1240. Su sepulcro, actualmente ubicado en el lateral de la iglesia de Santa María la Real de Sar, es el más antiguo que se conserva de un arzobispo compostelano y, por su epigrafía e imagen yacente, constituye una obra de gran interés, adscrita a los talleres artísticos herederos del Maestro Mateo. En este volumen, estudios de reconocidos especialistas abordan, a partir de la figura de Bernardo II, un período fundamental de la historia de Compostela en la Edad Media.Deputación de A CoruñaArcebispado de Santiago de CompostelaUniversidade de Vig
Revisiting the omitted price bias in the estimation of production functions
No full textThe lack of information on quantities presents significant challenges for estimating production functions. As shown by Klette and Griliches in 1996, deflating nominal variables using aggregate price indices leads to biased estimators. In this paper, we show that a similar problem arises when firm-specific prices are recovered from reported firm-specific price changes via a recursive formula. This recursion formula depends on an initial condition given by the unobserved price level in the base year, which then appears in the empirical production function as a firm-specific fixed effect. The standard practice is to ignore these fixed effects by setting the firm-specific prices in the base year to a constant value common to all firms, usually unity (zero in logs). We show that this practice generates biased estimators. We examine this bias via Monte Carlo simulations and with an empirical application. Solving this problem is not straightforward and requires further assumptions because these fixed effects generate nonlinear measurement errors
Classic hypotheses of area, time, and climatic stability fall short in explaining high tropical species richness
Get PDFAim Tropical biodiversity overshadows the number of species inhabiting other regions. Age, area, and stability constitute three classical ideas used to explain the higher richness in these warm and humid zones. In this study, we measured the global dynamics of tropical, arid, temperate, cold, and polar climate zones over the last 5 million years (Ma). We aimed to evaluate whether the age, area, and stability of these climate zones contribute to explain the observed differences in species richness. Location Global land. Taxa Amphibians, birds, and mammals. Methods We classified the paleoclimatic layers generated by the PALEO‐PGEM climatic emulator—temperature and precipitation for the last 5 Ma at 1000‐year intervals—into the main Köppen‐Geiger climate zones: tropical, arid, temperate, cold, and polar. We then calculated three variables: age, area, and stability. Age represents the duration that each map cell has remained within its current climate zone since its last change (map cell‐based measure). Area quantifies the total extent of each climate zone over time by summing all map cells corresponding to that climate zone (climate zone‐based measure). Stability indicates the number of times a given map cell changed between climate zones over time (map cell‐based measure). We implemented regression and correlation tests, Structural Equation Models, and decision trees to measure the relationship between these estimates and current global patterns of amphibian, bird, and mammal richness. Results Our results indicate that age, area, and stability do not account for the observed differences in species richness among the 5 climate zones. Main Conclusions None of these classical hypotheses alone can explain the high vertebrate tropical richness observed. Further investigation, incorporating additional taxa (e.g. invertebrates or plants), or integrating new perspectives (such as the influence of local variations in diversification processes) will provide a more comprehensive understanding of the factors shaping large‐scale biodiversity patterns.Agencia Estatal de Investigación | Ref. PID2021-123202NA-I00Universidade de Vigo | Ref. 00VI 131H 6410211Xunta de GaliciaMinisterio de Universidades | Ref. CT31/2
Interdisciplinary learning situations based on neuroscience inputs
No full textLa evolución constante del campo educativo exige adaptación continua para enfrentar las cambiantes demandas sociales. En este contexto, la interdisciplinariedad y la inclusión de conocimientos provenientes de la neurociencia suponen elementos de gran interés para diseñar experiencias educativas más efectivas, potenciando el aprendizaje de manera integral. El objetivo general consistió en diseñar e
implementar situaciones de aprendizaje interdisciplinares y recursos específicos con base en la neurociencia. Esto implicaba incluir sus principios clave en el diseño curricular, desarrollar el proceso formativo-práctico y evaluar las acciones llevadas a cabo. La metodología propuesta para abordar este proyecto se fundamentó en un enfoque crítico-descriptivo y un diseño de investigación-acción participativo. Se difundieron algunos de los recursos audiovisuales obtenidos y se probaron en
contexto real, con estudiantes de Educación Primaria, algunas de las experiencias programadas.The constant evolution of the educational field requires continuous adaptation to meet changing social demands. In this context, interdisciplinarity and the inclusion of knowledge from neuroscience are elements of great interest to design more effective educational experiences, enhancing learning in a comprehensive manner. The overall objective was to design and implement interdisciplinary learning situations and specific resources based on neuroscience. This involved including its key principles
in the curriculum design, developing the training-practical process and evaluating the actions carried out. The methodology proposed for this project was based on a critical-descriptive approach and a participatory action research design. Some of the audiovisual resources obtained were disseminated and some of the programmed experiences were tested in a real context with primary school students