1,721,397 research outputs found
Sistema embebido para procesamiento digital de señales (SEPRODIS)
No full textTesis (Ingeniería en Sistemas Computacionales), Instituto Politécnico Nacional, ESCOM, 2014, 1 archivo PDF, (153 páginas). tesis.ipn.m
ARENAS, Luis (2021) Capitalismo cansado. Tensiones (eco)políticas del desorden global. Madrid: Trotta. :
Full text linkReseña de ARENAS, Luis (2021). Capitalismo cansado. Tensiones (eco)políticas del desorden global. Madrid: Trotta
ARENAS, Luis (2021) Capitalismo cansado. Tensiones (eco)políticas del desorden global. Madrid: Trotta.
Full text linkReseña de ARENAS, Luis (2021). Capitalismo cansado. Tensiones (eco)políticas del desorden global. Madrid: Trotta
Less is enough. De l’utopie d’une pauvreté luxueuse
No full textArenas, Luis, “Less is enough. De l’utopie d’une pauvreté luxueuse », in : Ferrero, Corinne, Aragüés, Juan Manuel, Créer le présent, imaginer l’avenir. Dissidences po/éthiques de la littérature et de la philosophie contemporaines, Collection Dissidences / Disidenci@s 2, Pessac-Pau, PUPPA, 2024, 107-116
Arenas, Luis (2021). Capitalismo cansado. Tensiones (eco)políticas del desorden global. Trotta. 202 pp.
No full text(Al ser una nota crítica no se debe adjuntar un resumen, pero se hace igualmente por su obligatoriedad en la plataforma).
El presente texto señala algunas de las intersecciones del libro ARENAS, Luis (2021). Capitalismo cansado. Tensiones (eco)políticas del desorden global con otras aproximaciones que, de manera crítica, están analizando el presente. Se muestran sus argumentos principales y principales tesis de discusión, realzando sus virtudes.
Flow Cell Characterisation: Flow Visualisation, Pressure Drop and Mass Transport at 2D Electrodes in a Rectangular Channel
Full text linkAiming to demonstrate the importance and facility of characterising the reaction environment in new commercial laboratory-scale flow cells, fluid flow, pressure drop and space averaged mass transport coefficient were studied in the C-Flow® Lab 5 × 5 cell. A flow-by configuration with smooth, planar electrodes in a rectangular channel was used. Electrolyte mean linear velocities of 2 to 10 cm s−1 past the electrode surface and channel Reynolds numbers of 53 to 265 were considered. The effect of a turbulence promoter next to the working electrode was evaluated. Flow distribution was explored by a qualitative flow visualization study, while the relevance of pressure drop was shown by measurements over the flow channel and the whole cell as a function of mean linear velocity. The electrochemical performance was quantified from the limiting current, permitting the determination of the mass transport coefficient at the electrodes over the same range of flow rates. Reactant conversion in the batch recirculation mode and normalised space velocity were predicted from the electrochemical plug flow reactor design equation. Results were compared to well-characterised electrochemical flow reactors found in the literature. The significance of characterisation techniques and basic reactor models during the development of new processes is emphasised
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Redox flow batteries for energy storage: their promise, achievements and challenges
No full textRedox flow batteries continue to be developed for utility-scale energy storage applications. Progress on standardisation, safety and recycling regulations as well as financing has helped to improve their commercialisation. The technical progress of redox flow batteries has not considered adequately the significance of electrolyte flow velocity, mass transfer and plug flow reactor modelling, despite steps in the right direction. 3D simulations of fluid flow, pressure drop, current distribution and mechanical resistance using commercial software are becoming more common, but satisfactory validation by experiments is still unusual. The majority of research tends to report short term studies on small electrodes, often in poorly defined flow channels; long term evaluation of electrode and membrane durability on a pilot scale is needed. Digital imaging of electrode structure using X-ray computed tomography is increasingly being used. Much activity is directed to organic and non-aqueous systems. However, scale-up and high, sustained charge capacity using electrolytes of moderate cost which are environmentally acceptable to source, store, transport and handle require considerable attention. Recommendations for future work are discussed
Zinc–cerium and related cerium-based flow batteries: progress and challenges
No full textThe Zn–Ce flow battery (FB) has drawn considerable attention due to its ability to achieve open-circuit voltages of up to 2.5 V, which surpasses any other aqueous, hybrid FB or Zn-based FB chemistry. This Zn–Ce FB was introduced in the early 2000s, building upon the proven industrial electrolysis of cerium ions for mediated organic electrosynthesis and specialist oxidative cleaning together with the classical use of zinc in discharging battery anodes. The half-cell reactions involve the Ce3+/Ce4+and Zn/Zn2+redox couples at the positive and negative electrodes, respectively. Electrode kinetics, electrode materials, and electrolyte compositions, including mixed acids, have been studied. Lately, hydrodynamic simulations of the positive half-cell and life-cycle analysis have been performed, in addition to more extended charge/discharge cycling. Scale-up tests have involved 0.25 m2membrane-divided cells with composite carbon high-density-polyethylene bipolar electrodes coated with Ti and Pt by physical vapor deposition and a discharge power density of 2 kW m−2. In view of the moderate cost of cerium, variants have been developed to complement the positive electrode reaction, resulting in V–Ce and Ti–Ce FBs, H2–Ce half-fuel cells, and, more recently, novel chemistries based on inorganic and organic Ce complexes. Recommended R & D studies to further research knowledge and aid industrial development are highlighted.</p
- …
