Estudio de un sistema solar térmico utilizando dispositivos sombreadores de edificios

En esta tesis se analiza un nuevo captador solar térmico integrado en dispositivo sombreador de edificio. Este tipo de captadores se utilizan para producir sombra en las ventanas o superficies acristaladas, al mismo tiempo que calientan el agua que pasa por su interior. Los objetivos alcanzados en esta tesis son los siguientes: * Descripción de un nuevo cpatador solar sombreador, definiendo los parámetros geométricos que lo determinan y cuantificando la energía captada. * Estudio del modelo de operación del captador para diferentes configuraciones propuestas, analizando las transferencias energéticas de los diferentes elementos que la componen. * Validación del modelo mediante estudio experimental. * Evaluación de aplicación del captador solar integrado para un sistema de agua caliente, donde se realizó el estudio de viabilidad económica y la estimación de dióxido de carbono que se deja de emitir a la atmósfera por usar este sistema

Acoetidae (Annelida, Polychaeta) from the Iberian Peninsula, Madeira and Canary islands, with description of a new species

Six species of acoetid polychaetes are reported from the Iberian Peninsula and Macaronesia: Euarche tubifex Ehlers, 1887, Euarche cristata Núñez, n. sp., Eupanthalis kinbergi McIntosh, 1876, Eupolyodontes gulo (Grube, 1855), Polyodontes maxillosus (Ranzani, 1817), and Panthalis oerstedi (Kinberg, 1856). Material was collected during several sublittoral benthic surveys. Descriptions, figures, and a key for the six species are included. The new species Euarche cristata is characterized by its prostomium with cristate or serrated posterior margin

Application of net zero extended exergy buildings concept for sustainable buildings analysis

[EN] Different Zero-Energy Building (ZEB)-related definitions considering its four main dimensions, such as zero energy, zero carbon, zero exergy and zero cost, have been proposed by different investigators. Among these, exergy-based definitions are relatively low in numbers. In this regard, the main objective of this present study is to propose net zero extended exergy buildings as a new concept, which combines extended exergy and net zero exergy building concepts and is a measure of the exergetic footprint. This concept setups a balance between extended exergy accounting of electricity from the grid and electricity generated in building. The proposed methodology is applied to a building available in the literature for heating and cooling seasons. Results show that 450Wp peak power and 44.181 kWh electrical energy must be obtained for meeting the electricity demand of the building. Another novel result is that the extended exergy accounting of the electricity generated by PV panels is bigger than the extended exergy of the electricity taken from the gird meaning that exergetic footprint of the electricity generated by PV panels is bigger. However, this result must be interpreted for the whole life time of the system.S

Carbon nanostructured films modified by metal nanoparticles supported on filtering membranes for electroanalysis

A novel methodology to prepare sensors based on carbon nanostructures electrodes modified by metal nanoparticles is proposed. As a proof of concept, a novel bismuth nanoparticle/carbon nanofiber (Bi-NPs/CNF) electrode and a carbon nanotube (CNT)/gold nanoparticle (Au-NPs) have been developed. Bi-NPs/CNF films were prepared by 1) filtering a dispersion of CNFs on a polytetrafluorethylene (PTFE) filter, and 2) filtering a dispersion of Bi-NPs chemically synthesized through this CNF/PTFE film. Next the electrode is prepared by sticking the Bi-NPs/CNF/PTFE film on a PET substrate. In this work, Bi-NPs/CNF ratio was optimized using a Cd2+ solution as a probe sample. The Cd anodic stripping peak intensity, registered by differential pulse anodic stripping voltammetry (DPASV), is selected as target signal. The voltammograms registered for Cd stripping with this Bi-NPs/CNF/PTFE electrode showed well-defined and highly reproducible electrochemical. The optimized Bi-NPs/CNF electrode exhibits a Cd2+ detection limit of 53.57 ppb. To demonstrate the utility and versatility of this methodology, single walled carbon nanotubes (SWCNTs) and gold nanoparticles (Au-NPs) were selected to prepare a completely different electrode. Thus, the new Au-NPs/SWCNT/PTFE electrode was tested with a multiresponse technique. In this case, UV/Vis absorption spectroelectrochemistry experiments were carried out for studying dopamine, demonstrating the good performance of the Au-NPs/SWCNT electrode developed.Ministerio de Economía y Competitividad (CTQ2014-61914-EXP, CTQ2014-55583-R, TEC2014-51940-C2-2R, CTQ2015-71955-REDT) and Junta de Castilla y León (BU033-U16)Ministerio de Economía y Competitividad (CTQ2014-61914-EXP, CTQ2014-55583-R, TEC2014-51940-C2-2R, CTQ2015-71955-REDT) and Junta de Castilla y León (BU033-U16

Entre víctimas y victimarios: La construcción mediática de la crisis en la educación. El caso del «conflicto docente» en los medios nacionales

En este trabajo nos proponemos indagar estrategias discursivas de la prensa escrita en ocasión de las acciones de lucha planteadas por los gremios docentes en demanda de recomposición salarial y apertura de paritarias docentes, previas al inicio del ciclo lectivo 2017. En un contexto de mediatización de la cultura en particular, y de la sociedad en general (Da Porta, 2015), nos interesa reconocer de qué modo los medios hegemónicos abordan problemáticas vinculadas con la educación, particularmente aquellas surgidas a partir de la suspensión de las paritarias nacionales por parte del Estado nacional. Consideramos central este análisis en tanto entendemos que el papel de los medios no se limita a darvisibilidad a los hechos a través de la construcción de una agenda noticiosa, sino que constituyen espacios de producción de acontecimientos sociales, a decir de Verón, desde los cuales se propone un modo de comprender la realidad, naturalizando formas de nombrar y significar.Fil: Llimós, Ana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Centro de Estudios Avanzados; ArgentinaFil: Palmero, Paula Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Centro de Estudios Avanzados; ArgentinaFil: Piretro, Ana Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Centro de Estudios Avanzados; Argentin

Dissolved CH4 coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll a in anoxic waters of reservoirs

Methane (CH4) emissions from reservoirs are responsible for most of the atmospheric climatic forcing of these aquatic ecosystems, comparable to emissions from paddies or biomass burning. Primarily, CH4 is produced during the anaerobic mineralization of organic carbon in anoxic sediments by methanogenic archaea. However, the origin of the recurrent and ubiquitous CH4 supersaturation in oxic waters (i.e., the methane paradox) is still controversial. Here, we determined the dissolved CH4 concentration in the water column of 12 reservoirs during summer stratification and winter mixing to explore CH4 sources in oxic waters. Reservoir sizes ranged from 1.18 to 26.13 km(2). We found that dissolved CH4 in the water column varied by up to 4 orders of magnitude (0.02-213.64 mu mol L-1), and all oxic depths were consistently supersaturated in both periods. Phytoplanktonic sources appear to determine the concentration of CH4 in these reservoirs primarily. In anoxic waters, the depth-cumulative chlorophyll a concentration, a proxy for the phytoplanktonic biomass exported to sediments, was correlated to CH4 concentration. In oxic waters, the photosynthetic picoeukaryotes' abundance was significantly correlated to the dissolved CH4 concentration during both the stratification and the mixing. The mean depth of the reservoirs, as a surrogate of the vertical CH4 transport from sediment to the oxic waters, also contributed notably to the CH4 concentration in oxic waters. Our findings suggest that photosynthetic picoeukaryotes can play a significant role in determining CH4 concentration in oxic waters, although their role as CH4 sources to explain the methane paradox has been poorly explored

An oleuropein β-glucosidase from olive fruit is involved in determining the phenolic composition of virgin olive oil

Phenolic composition of virgin olive oil is determined by the enzymatic and/or chemical reactions that take place during olive fruit processing. Of these enzymes, β-glucosidase activity plays a relevant role in the transformation of the phenolic glycosides present in the olive fruit, generating different secoiridoid derivatives. The main goal of the present study was to characterize olive fruit β-glucosidase genes and enzymes responsible for the phenolic composition of virgin olive oil. To achieve that, we have isolated an olive β-glucosidase gene from cultivar Picual (OepGLU), expressed in Nicotiana benthamiana leaves and purified its corresponding recombinant enzyme. Western blot analysis showed that recombinant OepGLU protein is detected by an antibody raised against the purified native olive mesocarp β-glucosidase enzyme, and exhibits a deduced molecular mass of 65.0 kDa. The recombinant OepGLU enzyme showed activity on the major olive phenolic glycosides, with the highest levels with respect to oleuropein, followed by ligstroside and demethyloleuropein. In addition, expression analysis showed that olive GLU transcript level in olive fruit is spatially and temporally regulated in a cultivar-dependent manner. Furthermore, temperature, light and water regime regulate olive GLU gene expression in olive fruit mesocarp. All these data are consistent with the involvement of OepGLU enzyme in the formation of the major phenolic compounds present in virgin olive oil

The "greening" of environmental sciences studies in Spain

Presentamos los resultados de un proceso de identificación de la presencia de la Educación Ambiental (EA) en los grados de Ciencias Ambientales (CA) en España. Para ello hemos indagado en las páginas web de las universidades, señalando la presencia de la EA, su carácter optativo/obligatorio, los departamentos responsables de la misma y los indicadores de EA y de metodología docente en sus guías docentes. Por otro lado se aplicó una encuesta a una muestra de estudiantes universitarios del grado de CA sobre su interés hacia la EA, la naturaleza de esta y su grado de acuerdo con los indicadores anteriores. Los resultados evidencian una implantación parcial de la EA y una esperanzadora actitud de los estudiantes hacia dicha presencia.We show the results of a process of identifying the presence of Environmental Education (EE) in Environmental Sciences degrees (ES) in Spain. So we have searched into the websites of universities, pointing the presence of EE, the optional/compulsory character, the departments responsible for it, and indicators of EE and teaching methodology in their teaching guides. On the other hand a survey was applied to a sample of students of university degree of ES including their interest in the EE, the nature of this, and how much they agree with the above indicators. The results show a partial implementation of the EE and a hopeful attitude of students towards such presence

Job´s syndrome and to miliary tuberculosis

El síndrome de hiper IgE también denominado síndrome de Job, es una inmunodeficiencia primaria poco frecuente, cuyo modo de herencia puede ser autosómico recesivo o dominante. Se caracteriza por altos niveles de IgE, eosinofilia, abscesos cutáneos, eccema, candidiasis mucocutánea crónica e infecciones pulmonares recidivantes que contribuyen al desarrollo de neumatoceles y bronquiectasias. El germen más frecuentemente aislado es el Staphylococcus aureus. En la actualidad, ante la mayor supervivencia de los pacientes se han comunicado infecciones oportunistas y linfomas. Existen escasas publicaciones de pacientes con enfermedad por Mycobacterium tuberculosis asociada a síndrome de hiper IgE, por lo que consideramos relevante comunicar el caso de un paciente con antecedentes de una tuberculosis pulmonar, que presentó una tuberculosis miliar con grave compromiso respiratorio, con buena respuesta al tratamiento estándar con drogas de primera línea.The hyper Immunoglobulin E syndrome, also known as Job´s syndrome, is a rare primary immunodeficiency, its mechanisms of inheritance maybe recessive or dominant autosomal. It is characterized by high levels of IgE, eosinophilia, skin abscesses, eczema, chronic mucocutaneous candidiasis and recurrent pulmonary infections all of which contribute to the development of pneumatoceles and bronchiectasis. The most frequently isolated bacteria is Staphylococcus aureus. Currently, despite the highest survival of patients, lymphomas and other opportunistic infections have been reported. There are few reports of patients with Mycobacterium tuberculosis infection associated with hyper IgE syndrome. Therefore it is relevant that we report a case history of a patient with pulmonary tuberculosis, presenting miliary tuberculosis and severe respiratory compromise, who responded positively to standard anti-tuberculous treatment with first line drugs.Fil: Gamberale, Ana. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas ; ArgentinaFil: Moreira, Ileana. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños ; ArgentinaFil: Bartoletti, Bruno. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas ; ArgentinaFil: Cruz, Víctor. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas ; ArgentinaFil: Bezrodnik, Liliana. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños ; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Alberti, Federico. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas ; ArgentinaFil: Castro Zorrilla, Liliana. Universidad de Buenos Aires; ArgentinaFil: Palmero, Domingo. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas ; Argentin