46 research outputs found

    Cooling Process Analysis of a 5-Drum System for Radioactive Waste Processing

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    A cooling system design for the processing of radioactive waste drums is investigated in this work, with the objective of providing insights for the determination of the air flow rate required to ensure an acceptable slag temperature (323 K or below) after 5 days. A methodology based on both 3D and 2D axisymmetric Computational Fluid Dynamics (CFD) modelling is developed. Transient temperature distributions within the drums in time and space determined by the heat transfer characteristics are studied in detail. A sensitivity analysis is also carried out assuming different physical properties of the radioactive slag. It was found out that for all variations analyzed, the maximum temperature of slag at the end of five days cooling is below 323 K, where the maximum outlet air temperature for a minimum air inlet velocity of 1 m/s is between 320 K and 323 K depending on the radioactive slag properties. When glass-like radioactive slag properties are assumed, the internal heat conduction within the slag is limiting the overall heat transfer, therefore requiring significantly longer cooling times

    Aportaciones al conociento del género Equisetum L. I. Descripción de los microcaracteres de E. Palustre L.

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    Se realiza una descripción detallada de los caracteres anatomo histológicos de Equisetum palustre L. On réalise une description détaillée des caractères anatomo histologiques de quisetu palustre L

    Recuperación y reintroducción de Marsilea quadrifolia en los arrozales del delta del Ebro (Tarragona, España).

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    [email protected] [email protected] quadrifolia ha llegado a ser una especie desaparecida en el Delta del Ebro. En este trabajo se describe el proceso de recuperación de la especie por localización de esporocarpos en el suelo, germinación de los mismos en el laboratorio y cultivo en maceta de las plántulas obtenidas, a partir de las cuales se procede a la reintroducción de Marsilea quadrifolia en antiguos arrozales dentro del terreno del Parque Natural, así como las medidas de conservación ex situ aplicadas sobre esta especie que tradicionalmente formaba parte de las comunidades de Orizetea sativae Miyawaki 1960 en esta zona.Marsilea quadrifolia has got to be a extincted species in the Ebro’s Delta. In this work the process of recovery of the species is described by sporocarps localization in the soil, germination of the same ones in the laboratory and cultivation in pots of the obtained sporelings, from which we proceeded to the reintroduction of Marsilea quadrifolia in old rice fields inside the land of the Natural Park, as well as the conservation measures ex situ applied on this species that traditionally took part of the communities of Orizetea sativae Miyawaki 1960 in this area

    Aportaciones al conocimiento del género Equisetum L. II. E. x litorale Rupr.

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    Se realiza una descripción detallada de los caracteres morfológicos y anatomo-histológicos de Equisetum n litorale Rupr. (E. arvense x E. fluviatile).On réalise una description détaillée des caractères anatomo-histologiques et morphologiques de Equisetum x litorale Rupr. (E. arvense x E. fluviale )

    Aproximación al estudio de las equisetáceas ibéricas, III. Acerca del cono del género Hippochaete Milde

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    Se realiza una descripción anatómica de cada una de las partes que constituye el cono de las especies ibéricas del género Hippochaete (H. ramosissima (Desf.) Bruhin, H. hyemalis (L.) Bruhin e H. variegata (Schleicher) Bruhin).An anatomic description of every constituent part of the genus Hippochaete (H. ramosissima (Desf.) Bruhin, H. hyemalis (L.) Bruhin and H. variegata (Schleicher) Bruhin) is expose

    Sobre la distribución del almidón en las Lycopodyales

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    Se realiza una descripción de las zonas donde se acumula almidón, tanto en el tallo erecto como en el rastrero de Lycopodiales, observando que su disposición depende, en las especies estudiadas, del biótipo y de la anatomía.A detailed description of the zones where the starch is stored, both in the aerial shoot and the creeping stem of the Lycopodiales is done, correlating it with the biotypes and anatomy of the studied species

    Sobre la distribución del almidón en las Lycopodyales

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    A detailed description of the zones where the starch is stored, both in the aerial shoot and the creeping stem of the Lycopodiales is done, correlating it with the biotypes and anatomy of the studied species.Se realiza una descripción de las zonas donde se acumula almidón, tanto en el tallo erecto como en el rastrero de Lycopodiales, observando que su disposición depende, en las especies estudiadas, del biótipo y de la anatomía

    Data from Experimental Analysis of the Performance and Load Cycling of a Polymer Electrolyte Membrane Fuel Cell

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    Fuel cells are electrochemical devices that convert the chemical energy stored in fuels (hydrogen for polymer electrolyte membrane (PEM) fuel cells) directly into electricity with high e ciency. Fuel cells are already commercially used in di erent applications, and significant research e orts are being carried out to further improve their performance and durability and to reduce costs. Experimental testing of fuel cells is a fundamental research activity used to assess all the issues indicated above. The current work presents original data corresponding to the experimental analysis of the performance of a 50 cm2 PEM fuel cell, including experimental results from a load cycling dedicated test. The experimental data were acquired using a dedicated test bench following the harmonized testing protocols defined by the Joint Research Centre (JRC) of the European Commission for automotive applications. With the presented dataset, we aim to provide a transparent collection of experimental data from PEM fuel cell testing that can contribute to enhanced reusability for further research.Ministerio de Ciencia, Innovación y Universidades de España ENE2017-91159-EXPMinisterio de Economía y Competitividad UNSE15-CE296

    La sección Rhamnastrum Rouy (Rhamnus, Rhamnaceae) en el norte de la Península Ibérica

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    Se presenta un estudio anatómico y morfológico de los táxones pertenecientes a la sección Rhamnastrum Rouy presentes en el Norte de la Península Ibérica. Los datos obtenidos se tratan estadísticamente mediante la utilización de técnicas de clasificación y se concluye que pueden reconocerse tres especies (Rhmnus alpina L.. Rhamnus legionensis Rothm. y Rhamnus pumila Turra)A taxonomic study of the section Rhamnastrum Rouy in the Northem of Iberian Peninsula is presented. The study involves an anatomic and morphologic assay. The results were analyzed by means of multivariate techniques and three species were recognized: Rhamnus alpina L., Rhamnus legionensis Rothm. and Rhamnus pumila [email protected] [email protected] [email protected] [email protected]
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