273 research outputs found
El ICMA instala un nuevo detector de neutrones en el Institut Laue-Langevin
Página web divulgativa.El Instituto de Ciencia Materiales de Aragón (ICMA) ha desarrollado un detector de neutrones, y ya lo está instalando en el Institut Laue-Langevin (ILL) de Grenoble (Francia), centro de referencia mundial en técnicas neutrónicas. Además, el Instituto gestionará para toda España los instrumentos españoles del ILL.Peer Reviewe
Predicting performance in team games: The automatic coach
This is an electronic version of the paper presented at the 3rd International Conference on Agents and Artificial Intelligence, held in Rome on 2011A wide range of modern videogames involves a number of players collaborating to obtain a common goal.
The way the players are teamed up is usually based on a measure of performance that makes players with a
similar level of performance play together. We propose a novel technique based on clustering over observed
behaviour in the game that seeks to exploit the particular way of playing of every player to find other players
with a gameplay such that in combination will constitute a good team, in a similar way to a human coach.
This paper describes the preliminary results using these techniques for the characterization of player and team
behaviours. Experiments are performed in the domain of Soccerbots.This work has been partly supported by: Spanish
Ministry of Science and Education under grant
TIN2009-13692-C03-03, TIN2010-19872 and Spanish
Ministry of Industry under grant TSI, 020110-
2009-205
Quantum entanglement patterns in the structure of atomic nuclei within the nuclear shell model
Quantum entanglement offers a unique perspective into the underlying
structure of strongly-correlated systems such as atomic nuclei. In this paper,
we use quantum information tools to analyze the structure of light and medium
mass berillyum, oxygen, neon and calcium isotopes within the nuclear shell
model. We use different entanglement metrics, including single-orbital
entanglement, mutual information, and von Neumann entropies for different
equipartitions of the shell-model valence space and identify mode/entanglement
patterns related to the energy, angular momentum and isospin of the nuclear
single-particle orbitals. We observe that the single-orbital entanglement is
directly related to the number of valence nucleons and the energy structure of
the shell, while the mutual information highlights signatures of proton-proton
and neutron-neutron pairing. Proton and neutron orbitals are weakly entangled
by all measures, and in fact have the lowest von Neumann entropies among all
possible equipartitions of the valence space. In contrast, orbitals with
opposite angular momentum projection have relatively large entropies. This
analysis provides a guide for designing more efficient quantum algorithms for
the noisy intermediate-scale quantum era.Comment: Submitted to EPJA Topical Issue "Quantum computing in low-energy
nuclear theory
Towards a feasible and scalable production of bio-xerogels
© 2015 Elsevier Inc. Hypothesis: The synthesis process of carbon xerogels is limited, mainly due to two drawbacks that prevent their introduction onto the market: (i) the long time required for producing the material and (ii) the reagents used for the synthesis, which are costly and harmful to the environment. Microwave radiation is expected to produce a reduction in time of more than 90%, while the use of tannin instead of resorcinol will probably result in a cost-effective carbonaceous material. Experiments: Resorcinol-tannin-formaldehyde xerogels containing different amounts of tannin, either with or without a surfactant (sodium dodecyl sulphate), were synthesized by means of two different heating methods: conventional and microwave heating. The effects of the surfactant, the heating method and the addition of tannin upon the porous structure and the chemical composition of the final materials were evaluated. Findings: It was found that the addition of surfactant is essential for obtaining highly porous xerogels when using tannins. The heating method also plays an important role, as conventionally synthesized samples display a greater volume of large pores. However, tannins are less sensitive to microwave radiation and their use results in tannin-formaldehyde xerogels that have a porous structure and chemical composition similar to those of resorcinol-formaldehyde xerogels.Financial support from the Ministerio de Economía y Competitividad of Spain MINECO (under Projects MAT2011-23733, IPT-2012-0689-420000 and CTQ2013-49433-EXP) is greatly acknowledged. NRR is also grateful to MINECO for her predoctoral research grant. The French authors also gratefully acknowledge the financial support of the CPER 2007–2013 “Structuration du Pôle de Compétitivité Fibres Grand’Est” (Competitiveness Fibre Cluster), through local (Conseil Général des Vosges), regional (Région Lorraine), national (DRRT and FNADT) and European (FEDER) funds.Peer Reviewe
Activation of aromatic C−C bonds of 2,2’-bipyridine ligands
4,4’-Disubstituted-2,2′-bipyridine ligands coordinated to Mo and Re cationic fragments become dearomatized by an intramolecular nucleophilic attack from a deprotonated N-alkylimidazole ligand in cis disposition. The subsequent protonation of these neutral complexes takes place on a pyridine carbon atom rather than at nitrogen, weakening an aromatic C−C bond and affording a dihydropyridyl moiety. Computational calculations allowed for the rationalization of the formation of the experimentally obtained products over other plausible alternatives.Financialsupport from Ministerio de Economía y Competitividad/FEDER (grant CTQ2015-70231-P) and Principado de Asturias (grant GRUPIN14-103) is gratefully acknowledged. J.D.thanks COMPUTAEX for granting access to LUSITANIA supercomputing facilities.Peer Reviewe
Mujer e investigación en el CSIC de Aragón
2011: Año de la mujer investigadora.Peer Reviewe
Mujer e investigación
2 pdfs. de los paneles correspondientes a la Exposición "Mujer e investigación", organizada en 2011 por la Delegación del CSIC en Aragón
The Spatial Extent of (U)LIRGs in the mid-Infrared I: The Continuum Emission
We present an analysis of the extended mid-infrared (MIR) emission of the
Great Observatories All-Sky LIRG Survey (GOALS) sample based on 5-15um low
resolution spectra obtained with the IRS on Spitzer. We calculate the fraction
of extended emission as a function of wavelength for the galaxies in the
sample, FEE_lambda. We can identify 3 general types of FEE_lambda: one where it
is constant, one where features due to emission lines and PAHs appear more
extended than the continuum, and a third which is characteristic of sources
with deep silicate absorption at 9.7um. More than 30% of the galaxies have a
median FEE_lambda larger than 0.5 implying that at least half of their MIR
emission is extended. Luminous Infrared Galaxies (LIRGs) display a wide range
of FEE in their warm dust continuum (0<=FEE_13.2um<=0.85). The large values of
FEE_13.2um that we find in many LIRGs suggest that their extended MIR continuum
emission originates in scales up to 10kpc. The mean size of the LIRG cores at
13.2um is 2.6kpc. However, once the LIR of the systems reaches the threshold of
~10^11.8Lsun, all sources become clearly more compact, with FEE_13.2um<=0.2,
and their cores are unresolved. Our estimated upper limit for the core size of
ULIRGs is less than 1.5kpc. The analysis indicates that the compactness of
systems with LIR>~10^11.25Lsun strongly increases in those classified as
mergers in their final stage of interaction. The FEE_13.2um is also related to
the contribution of an active galactic nucleus (AGN) to the MIR. Galaxies which
are more AGN-dominated are less extended, independently of their LIR. We
finally find that the extent of the MIR continuum emission is correlated with
the far-IR IRAS log(f_60um/f_100um) color. This enables us to place a lower
limit to the area in a galaxy from where the cold dust emission may originate,
a prediction which can be tested soon with the Herschel Space Telescope.Comment: 18 pages, 8 figures, accepted for publication in Ap
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