[Todos] RECORDATORIO SEMINARIOS IFLP/DTO FÍSICA

[tierno]

SEMINARIOS  DEL IFLP Y DEL DEPARTAMENTO DE FÍSICA 

MARTES 14 DE JULIO- 10.30HS - AULA CHICA 

TÍTULO: MAGNESIUM-BASED NANOMATERIALS FOR HYDROGEN STORAGE: DESIGN AND
CRITICAL EVALUATION OF SPD PROCESSING ROUTES 

EXPOSITOR: DR. DANIEL RODRIGO LEIVA. UNIVERSIDAD FEDERAL DE SAN CARLOS
(SP, BRASIL). 

RESUMEN: 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. 

  

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SEMINARIO DEL IFLP Y DEL DEPARTAMENTO DE FÍSICA 

MIÉRCOLES 15 DE JULIO- 14:00HS. – AULA CHICA 

TÍTULO: PROBING THE ELECTRO-WEAK SYMMETRY BREAKING MECHANISM USING
DI-HIGGS EVENTS AT THE LHC WITH THE ATLAS DETECTOR. 

EXPOSITOR: EDSON CARQUIN LÓPEZ  

RESÚMEN: 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. 

 
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