133 research outputs found

    The cost overrun of depopulation to improve energy efficiency in buildings: A case study in the Mediterranean Region

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    The implementation of energy efficiency measures in public buildings is a complex process that hinges on multiple factors. A factor relevant for some European regions is their ongoing depopulation. In these regions, building energy retrofitting presents additional challenges to those in urban areas, such as over-dimensioned public buildings and low occupancy levels. This work analyses these challenges in the province of Teruel (Spain), one of the regions with the highest depopulation levels in Spain. To this end, a methodology has been developed to assess the effect of depopulation on the cost of upgrading public buildings to improve their energy efficiency. The results show that the investment required per inhabitant for building retrofitting is approximately four times as high in depopulated areas as in urban areas. Furthermore, the low occupancy levels of public buildings can triple the payback time of some energy efficiency measures. To overcome these barriers, in addition to specific policies for depopulated areas, energy planning is essential. An adequate action plan, combining the implementation of energy efficiency measures and the integration of renewable energies in buildings, is the most effective tool to improve the sustainability of public buildings circumventing the barriers created by depopulation

    Análisis de la transferencia de calor en la zona convectiva de una caldera de oxi-combustión

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    En este proyecto se analiza la transferencia de calor en la zona convectiva de una caldera que opera en modo oxi-combustión y los factores que influyen en dicha transferencia. Para ello, se va a describir este modo de combustión y a comparar con el modo de combustión tradicional, esto es, con aire. Cada modo de combustión produce unos gases de salida con una composición distinta, lo cual hace que estos tengan diferentes propiedades termodinámicas que pueden afectar a la transferencia de calor en la zona convectiva de la caldera. Para comparar cada caso, se va a utilizar un modelo de fluidodinámica computacional desarrollado por el Grupo de Fluidodinámica Numérica (GFN) de la universidad de Zaragoza, con el que se simulará la zona convectiva de una caldera experimental. Esta caldera forma parte de la Fundación de la Ciudad de la Energía (CIUDEN), situada en la provincia de León, y puede operar en los dos modos, esto es, aire y oxi-combustión

    Potencial e impacto económico, social y ambiental de la biomasa: Aragón como caso de estudio

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    Los bosques y cultivos de Aragón atesoran una fuente de riqueza desaprovechada: la biomasa residual. Los pélets fabricados a partir de restos agrícolas y forestales son un combustible limpio y barato que está siendo infrautilizado. El propósito de este Trabajo de Fin de Grado es cuantificar el potencial de recurso agrícola y forestal en Aragón y estudiar qué beneficios traería su explotación para la economía, el medio ambiente y la sociedad rural. Para ello, empleará metodologías ya asentadas y desarrollará otras novedosas. Así mismo, este trabajo pretende determinar cuales son los efectos del tamaño de las plantas de peletizado en la sostenibilidad del proceso y cuál es el tamaño óptimo de las mismas.Para lograr sus objetivos, este trabajo se basará en estudios previos, aplicándolos al caso de Aragón. Mediante sistemas de información geográfica, determinará el potencial de biomasa de cada municipio y establecerá tres estrategias de aprovechamiento del recurso, en función del tamaño de la planta. Por último, comparará las distintas estrategias en función de su rentabilidad económica, sus emisiones de gases de efecto invernadero y su contribución a la lucha contra la despoblación.<br /

    Self-Assembled Lanthanide Antenna Glutathione Sensor for the Study of Immune Cells

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    This work was supported by grants CTQ2017-85658-R, BFU2015-67284-R, and PID2019-104366RB-C22 funded by MCIN/AEI/10.13039/501100011033/FEDER "Una manera de hacer Europa"; grant PID2020-114256RB-I00 funded by MCIN/AEI/10.13039/501100011033; grant A-FQM-386-UGR20 funded by FEDER/Junta de Andalucia-Consejeria de Transformacion Economica, Industria, Conocimiento y Universidades, and the CSIC grant 201580E073. Funding for open access charge: Universidad de Granada/CBUA.The small molecule 8-methoxy-2-oxo-1,2,4,5- tetrahydrocyclopenta[de]quinoline-3-carboxylic acid (2b) behaves as a reactive non-fluorescent Michael acceptor, which after reaction with thiols becomes fluorescent, and an efficient Eu3+ antenna, after self-assembling with this cation in water. This behavior makes 2b a highly selective GSH biosensor, which has demonstrated high potential for studies in murine and human cells of the immune system (CD4+ T, CD8+ T, and B cells) using flow cytometry. GSH can be monitored by the fluorescence of the product of addition to 2b (445 nm) or by the luminescence of Eu3+ (592 nm). 2b was able to capture baseline differences in GSH intracellular levels among murine and human CD4+ T, CD8+ T, and B cells. We also successfully used 2b to monitor intracellular changes in GSH associated with the metabolic variations governing the induction of CD4+ naiv̈ e T cells into regulatory T cells (TREG).MCIN/AEI/FEDER "Una manera de hacer Europa" CTQ2017-85658-R BFU2015-67284-R PID2019-104366RB-C22MCIN/AEI PID2020-114256RB-I00FEDER/Junta de Andalucia-Consejeria de Transformacion Economica, Industria, Conocimiento y Universidades A-FQM-386-UGR20CSIC grant 201580E073Universidad de Granada/CBU

    Rendimiento de uniones clavija de tipo perno encolado usando elementos finitos

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    Centro de Información Tecnológica[ES] Se presenta un estudio sobre las tecnologías de unión en nudos de estructuras de madera, centrándose sobre todo en aquellas de tipo perno encolado. Se buscó comparar el rendimiento de estas uniones con las de tipo clavija sin encolar y se compararon los resultados obtenidos por tres métodos: i) aplicando las ecuaciones analíticas contempladas en las normas oficiales y la literatura; ii) realizando estudios mediante el método de los elementos finitos; iii) y realizando ensayos de laboratorio de estos mismos diseños propuestos. Para realizar el estudio por el método de los elementos finitos, se prepararon varios modelos paramétricos que permitieron englobar todas las variaciones posibles de las variables que afectan a la unión. Los resultados permitieron determinar como la modificación de las variables estudiadas afectan al rendimiento en cada caso.[EN] A study is presented on knot-joining technologies for wooden structures, focusing especially on those of the glued bolt type. An attempt was made to compare the performance of these joints with those of the unglued pin type and the results obtained were compared by three methods: i) applying the analytical equations contemplated in the official standards and the literature; ii) carrying out studies using the finite element method; iii) and carrying out laboratory tests of these same proposed designs. To carry out the study using the finite element method, several parametric models were prepared that allowed all possible variations of the variables that affect the union to be included. The results allowed us to determine how the modification of the studied variables affects performance in each case.Junta de Castilla y Leó

    Selecting FRET pairs for visualizing amyloid aggregation

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    This work was supported by grant CTQ2017–85658-R funded by MCIN/AEI/10.13039/501100011033/FEDER “Una manera de hacer Europa” and grants PID2019–104366RB-C22 and PID2020–114256RBI00 funded by MCIN/AEI/10.13039/ 501100011033. A.R.-A. thanks the Spanish Ministerio de Educación y Formación Profesional for an FPU Ph.D. studentship.In a recent work, we reported a methodology for imaging the different stages of amyloid aggregation in quantitative multiparametric dual-color fluorescence lifetime imaging (FLIM) and superresolution microscopy by using a pair of dyes capable of binding aggregates and undergoing subsequent intra-aggregate energy transfer (FRET) (RuizArias et al. Sensors Actuat. B, 2022, 350:130882). In this microarticle we present the optimization process for choosing the best pair of dyes through a screening of different naphthalimides and quinolimides and other known amyloid-binding dyes.Spanish Ministerio de Educación y FormaciónGrant CTQ2017–85658-R funded by MCIN/AEI/10.13039/501100011033/FEDER “Una manera de hacer Europa”Grants PID2019–104366RB-C22 and PID2020–114256RBI00 funded by MCIN/AEI/10.13039/ 50110001103

    Análisis de tensiones en uniones de tres barras de cerchas ligeras de madera realizadas con placas-clavo

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    [ES] Este trabajo presenta un estudio de las tensiones que aparecen en una unión de tres barras, de una cercha ligera de madera, realizada con placas-clavo. El objetivo fue determinar el efecto de las variables más significativas, como el porcentaje de esfuerzo transmitido por contacto directo entre piezas que trabajan a compresión, el espesor de la placa, el nivel de cargas y el diseño de la unión. Para realizar el estudio, se desarrollaron modelos paramétricos de elementos finitos de la unión. Del análisis de los resultados, se concluye que existe un valor de la holgura entre piezas a partir del cual el contacto aparece, y otro por debajo del cual el porcentaje de la contribución de la transmisión de esfuerzo por contacto se estabiliza. También se observa que estos valores no se ven afectados por el espesor de la placa o el diseño de la unión

    Exchangeable Self-Assembled Lanthanide Antennas for PLIM Microscopy

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    This is the published manuscript version of the following manuscript: Exchangeable Self-Assembled Lanthanide Antennas for PLIM Microscopy, Angew. Chem. Int. Ed. 2023, e202314595 doi: https://doi.org/10.1002/anie.202314595 This article may be used for non-commercial purposes in accordance with Wiley Sharing Policies. Supplementary Materials accompanying this article can be found on-line at the publisher’s site.Lanthanides have unique photoluminescence (PL) emission properties, including very long PL life- times. This makes them ideal for biological imaging applications, especially using PL lifetime imaging micro- scopy (PLIM). PLIM is an inherently multidimensional technique with exceptional advantages for quantitative biological imaging. Unfortunately, due to the required prolonged acquisitions times, photobleaching of lantha- nide PL emission currently constitutes one of the main drawbacks of PLIM. In this study, we report a small aqueous-soluble, lanthanide antenna, 8-methoxy-2-oxo- 1,2,4,5-tetrahydrocyclopenta[de]quinoline-3-phosphonic acid, PAnt, specifically designed to dynamically interact with lanthanide ions, serving as exchangeable dye aimed at mitigating photobleaching in PLIM microscopy in cellulo. Thus, self-assembled lanthanide complexes that may be photobleached during image acquisition are continuously replenished by intact lanthanide antennas from a large reservoir. Remarkably, our self-assembled lanthanide complex clearly demonstrated a significant reduction of PL photobleaching when compared to well- established lanthanide cryptates, used for bioimaging. This concept of exchangeable lanthanide antennas opens new possibilities for quantitative PLIM bioimaging.Grant PID2020-114256RB-I00 funded by AEI/10.13039/501100011033Grant PID2019- 104366RB-C22 funded by AEI/10.13039/501100011033/ FEDER “Una manera de hacer Europa”Grants P21_00212, A-FQM-386-UGR20 and 2021/00627/001-FEDER_UJA_ 2020 funded by FEDER/Junta de Andalucía-Consejería de Transformación Económica, Industria, Conocimiento y UniversidadesCSIC grant 202180E073Acción 1 from Universidad de JaénFunding for open access charge: Universidad de Granada/CBUASpanish Ministerio de Educación y Formación Profesional for the FPU Ph.D. scholarshi

    ATP-Dependent Lon Protease Controls Tumor Bioenergetics by Reprogramming Mitochondrial Activity

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    We generated mice deficient in Lon protease (LONP1), a major enzyme of the mitochondrial quality control machinery. Homozygous deletion of Lonp1 causes early embryonic lethality, whereas its haploinsufficiency protects against colorectal and skin tumors. Furthermore, LONP1 knockdown inhibits cellular proliferation and tumor and metastasis formation, whereas its overexpression increases tumorigenesis. Clinical studies indicate that high levels of LONP1 are a poor prognosis marker in human colorectal cancer and melanoma. Additionally, functional analyses show that LONP1 plays a key role in metabolic reprogramming by remodeling OXPHOS complexes and protecting against senescence. Our findings demonstrate the relevance of LONP1 for cellular and organismal viability and identify this protease as a central regulator of mitochondrial activity in oncogenesis
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