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<p><span>Les agradezco la difusión del </span><span>anuncio</span><span> del próximo </span><span>seminario</span><span> del </span><strong>ciclo de Coloquios y Seminarios que se organizan en el Instituto de Física La Plata</strong><span>/ </span><strong>Departamento de Física. </strong>Se adjunta archivos para compartir en carteleras. </p>
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<p style="text-align: left;" align="center"><strong><span style="text-decoration: underline;">SEMINARIOS DEL IFLP y DEL DEPARTAMENTO DE FÍSICA</span></strong></p>
<p style="text-align: left;" align="center"><strong><span style="text-decoration: underline;">MARTES 14 de Julio- 10.30hs </span></strong><strong><span style="text-decoration: underline;">- AULA CHICA</span></strong></p>
<p style="text-align: left;"><strong><span style="text-decoration: underline;">TÍTULO:</span></strong><strong> Magnesium-based Nanomaterials for Hydrogen Storage: Design and Critical Evaluation of SPD Processing Routes</strong></p>
<p style="text-align: left;"><strong style="font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; white-space: pre-wrap;"><span style="text-decoration: underline;">EXPOSITOR</span></strong><strong style="font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; white-space: pre-wrap;">:</strong><strong style="font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; white-space: pre-wrap;"> </strong><strong style="font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; white-space: pre-wrap;">Dr. Daniel Rodrigo Leiva. Universidad Federal de San Carlos (SP, Brasil).</strong></p>
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<p class="Default" style="text-align: left;"><strong><span style="text-decoration: underline;">Resumen:</span></strong><strong><span style="text-decoration: underline;"> </span></strong> Different families of severe plastic deformation (SPD) processing techniques are being explored to produce hydrogen storage materials, in particular based on magnesium, its alloys or hydride. SPD can generate ultra-fine or even nanocrystalline microstructures with reduced consumption of time and energy during processing, when compared to high-energy ball milling (HEBM), with the additional benefit of increased air resistance. It is well known that the main aspects which control the hydrogen storage properties are the level of refinement of the microstructure, including the dispersion of additives (the so-called 'catalysts', as Fe or FeF3, among others), the deformation texture, the density of defects and the specific surface area of the material. In this presentation, we compare the structural characteristics and hydrogen storage properties of different Mg alloys or composites processed by different SPD routes, including ECAP (equal-channel angular pressing), cold rolling (CR) and cold forging (CF). We also have used selected process variables to produce different Mg-based materials with good hydrogen absorption and desorption kinetics at 623 K. We observed that the use of a short-time HEBM step in combination with SPD has remarkable effects on hydrogen capacity and kinetic properties. CR and CF of Mg alloys are particularly attractive when compared to ECAP, due to high-level of grain refinement and the possibility of producing directly highly deformed thin foils, oriented along [0002], and therefore with enhanced activation (first hydrogenation) time.</p>
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<p style="text-align: left;" align="center"><strong><span style="text-decoration: underline;">SEMINARIO DEL IFLP y DEL DEPARTAMENTO DE FÍSICA</span></strong></p>
<p style="text-align: left;" align="center"><strong><span style="text-decoration: underline;">Miércoles 15 de Julio- 14:00hs. – AULA CHICA</span></strong></p>
<p style="text-align: left;"><strong><span style="text-decoration: underline;">TÍTULO:</span></strong><strong> Probing the electro-weak symmetry breaking mechanism using di-Higgs events at the LHC with the ATLAS detector.</strong></p>
<p style="text-align: left;"><strong><span style="text-decoration: underline;">EXPOSITOR</span></strong><strong>: </strong><strong>Edson Carquin López </strong></p>
<p style="text-align: left;"><strong><span style="text-decoration: underline;">RESÚMEN:</span></strong> In the month of July of 2012 the two biggest LHC experiments, ATLAS and CMS, have announced the first evidence of the existence of a new particle with a mass of ~125 GeV. Subsequent studies (comprising the analysis of the whole LHC Run I data) tends to strongly support the fact that the recently discovered particle is indeed the largely sought Higgs boson particle. The knowledge of the mass value of the Higgs boson was eagerly expected, since it can tells us more about the underlying electro-weak symmetry breaking mechanism, particularly about the coefficients of the Higgs potential terms in the SM Lagrangian (self-couplings). The most direct experimental probe of the existence of trilinear terms comes from the measurement of the di-Higgs (+j) production, for which the SM cross section is very low ~40 fb, making this measurement only accesible at the future HL-LHC. On the other hand, many beyond the SM theories predict large enhancements of the di-Higgs production, either in a resonant or a non-resonant way, making this process accesible already at the LHC Run II, which is going to start in June. In this talk I will review the status of searches for di-Higgs production in Run I made by the ATLAS detector, and will describe the expectations for this measurement in the Run II for a number of BSM scenarios. </p>
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