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A Coruña, Spain

Andrade J.M.,University of runna | Cristoforetti G.,CNR Institute for Chemical and Physical Processes | Legnaioli S.,CNR Institute for Chemical and Physical Processes | Lorenzetti G.,CNR Institute for Chemical and Physical Processes | And 3 more authors.
Spectrochimica Acta - Part B Atomic Spectroscopy | Year: 2010

In this work we compare the analytical results obtained by traditional calibration curves (CC) and multivariate Partial Least Squares (PLS) algorithm when applied to the LIBS spectra obtained from ten brass samples (nine standards of known composition and one 'unknown'). Both major (Cu and Zn) and trace (Sn, Pb, Fe) elements in the sample matrix were analyzed. After the analysis, the composition of the 'unknown' sample, measured by X-ray Fluorescence (XRF) technique, was revealed. The predicted concentrations of major elements obtained by rapid PLS algorithms are in very good agreement with the nominal concentrations, as well as with those obtained by the more time-consuming CC approach. A discussion about the possible effects leading to discrepancies of the results is reported. The results of this study open encouraging perspectives towards the development of cheap LIBS instrumentation which would be capable, despite the limitations of the experimental apparatus, to perform fast and precise quantitative analysis on complex samples. © 2010 Elsevier Ltd. All rights reserved.


Suarez S.,University of runna | Leitao P.,Polytechnic Institute of Braganca | Adam E.,University of Valenciennes and HainautCambresis
Advances in Intelligent Systems and Computing | Year: 2013

Recursive Systems are often needed or recommended for automatically deploy or build a software system composed of multiple entities on a large network, or on distributed locations, without a central control. We use the recursive definitions proposed in holonic systems, as the recursiveness is an elemental structural property of their structure. Holonic systems are used to be implemented usingMAS technologies (platforms) on the basis of the shared functional properties of autonomy and cooperation of agents and holons. This paper discusses the adequacy of the actualMAS technologies for holonic recursiveness implementation. A comparison of MAS platforms is done through a framework that will guide the decisions of designers and developers. © Springer International Publishing Switzerland 2013.


Gomez-Aguirre L.C.,University of runna | Pato-Doldan B.,University of runna | Mira J.,University of Santiago de Compostela | Castro-Garcia S.,University of runna | And 4 more authors.
Journal of the American Chemical Society | Year: 2016

We present the first example of magnetic ordering-induced multiferroic behavior in a metal-organic framework magnet. This compound is [CH3NH3][Co(HCOO)3] with a perovskite-like structure. The A-site [CH3NH3]+ cation strongly distorts the framework, allowing anisotropic magnetic and electric behavior and coupling between them to occur. This material is a spin canted antiferromagnet below 15.9 K with a weak ferromagnetic component attributable to Dzyaloshinskii-Moriya (DM) interactions and experiences a discontinuous hysteretic magnetic-field-induced switching along [010] and a more continuous hysteresis along [101]. Coupling between the magnetic and electric order is resolved when the field is applied along this [101]: a spin rearrangement occurs at a critical magnetic field in the ac plane that induces a change in the electric polarization along [101] and [10-1]. The electric polarization exhibits an unusual memory effect, as it remembers the direction of the previous two magnetic-field pulses applied. The data are consistent with an inverse-DM mechanism for multiferroic behavior. © 2015 American Chemical Society.

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