Documents disponibles écrits par cet auteur

Cu deficiency in multi-stage co-evaporated Cu(In,Ga)Se2 for solar cells applications / R. Caballero in Acta materialia, Vol. 58 N° 9 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3468–3476 Titre : Cu deficiency in multi-stage co-evaporated Cu(In,Ga)Se2 for solar cells applications : Microstructure and Ga in-depth alloying Type de document : texte imprimé Auteurs : R. Caballero, Auteur ; V. Izquierdo-Roca, Auteur ; X. Fontané, Auteur Année de publication : 2011 Article en page(s) : pp. 3468–3476 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Cu  content  Cu(In,Ga)Se2  thin  films  Raman  spectroscopy  Scanning  electron  microscopy  Solar  cells Résumé : The objective of this work is to study the influence of the maximum Cu content during the deposition of Cu(In,Ga)Se2 (CIGSe) by multi-stage co-evaporation on the phases present in the final film, the film structure and the electrical properties of resulting solar cell devices. The variation of the composition is controlled by the Cu content in stage 2 of the deposition process. The different phases are identified by Raman spectroscopy. The in-depth Ga gradient distribution is investigated by in-depth resolved Raman scattering and secondary neutral mass spectroscopy. The morphology of the devices is studied by scanning electron microscopy. Efficiencies of 9.2% are obtained for ordered-vacancy-compound-based cells with a Cu/(In + Ga) ratio = 0.35, showing the system’s flexibility. This work supports the current growth model: a small amount of Cu excess during the absorber process is required to obtain a quality microstructure and high performance devices. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001072 [article] Cu deficiency in multi-stage co-evaporated Cu(In,Ga)Se2 for solar cells applications : Microstructure and Ga in-depth alloying [texte imprimé] / R. Caballero, Auteur ; V. Izquierdo-Roca, Auteur ; X. Fontané, Auteur . - 2011 . - pp. 3468–3476. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3468–3476 Mots-clés : Cu  content  Cu(In,Ga)Se2  thin  films  Raman  spectroscopy  Scanning  electron  microscopy  Solar  cells Résumé : The objective of this work is to study the influence of the maximum Cu content during the deposition of Cu(In,Ga)Se2 (CIGSe) by multi-stage co-evaporation on the phases present in the final film, the film structure and the electrical properties of resulting solar cell devices. The variation of the composition is controlled by the Cu content in stage 2 of the deposition process. The different phases are identified by Raman spectroscopy. The in-depth Ga gradient distribution is investigated by in-depth resolved Raman scattering and secondary neutral mass spectroscopy. The morphology of the devices is studied by scanning electron microscopy. Efficiencies of 9.2% are obtained for ordered-vacancy-compound-based cells with a Cu/(In + Ga) ratio = 0.35, showing the system’s flexibility. This work supports the current growth model: a small amount of Cu excess during the absorber process is required to obtain a quality microstructure and high performance devices. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001072

Planning federal public investment in Mexico using multiobjective decision making / B. Cobacho in Journal of the operational research society (JORS), Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 61 N° 9 (Septembre 2010) . - pp. 1328–1339 Titre : Planning federal public investment in Mexico using multiobjective decision making Type de document : texte imprimé Auteurs : B. Cobacho, Auteur ; R. Caballero, Auteur ; M. González, Auteur Année de publication : 2011 Article en page(s) : pp. 1328–1339 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Public  investment  planning  Human  development  Multiobjective  decision  making  Metaheuristic  method  Interactive  method Index. décimale : 001.424 Résumé : The scope of this article is showing how multicriteria decision making can be an efficient tool to manage public investment planning in complex situations. For this aim, we will analyse the problem in all its aspects: building the model from data using econometrical tools, solving the resulting highly complex model using modern efficient techniques (multiobjective meta-heuristics) and helping the decision maker to introduce his preferences in order to achieve the most preferred solution. This holistic approach let us provide an efficient solution to a complex public investment planning situation, improving the current state of the country relating not only economical aspects, but also social and human development aspects. The real situation studied is focused on Mexico, where, in recent decades, has undergone remarkable improvements in terms of economic growth, which has not been matched by significant improvements in several other basic aspects of human development, nor by reductions in regional inequalities. This suggests the need to establish policies aimed at improving these aspects and reducing inequalities. Federal public investment is an important tool in regional policy to promote and improve these aspects; so we introduce a multiobjective programming problem for planning federal public investment in Mexico. This model will focus on improving national levels in four main dimensions of human development (economic growth, education, health and housing), and on reducing regional inequalities for those dimensions. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n9/abs/jors2009101a.html [article] Planning federal public investment in Mexico using multiobjective decision making [texte imprimé] / B. Cobacho, Auteur ; R. Caballero, Auteur ; M. González, Auteur . - 2011 . - pp. 1328–1339. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 61 N° 9 (Septembre 2010) . - pp. 1328–1339 Mots-clés : Public  investment  planning  Human  development  Multiobjective  decision  making  Metaheuristic  method  Interactive  method Index. décimale : 001.424 Résumé : The scope of this article is showing how multicriteria decision making can be an efficient tool to manage public investment planning in complex situations. For this aim, we will analyse the problem in all its aspects: building the model from data using econometrical tools, solving the resulting highly complex model using modern efficient techniques (multiobjective meta-heuristics) and helping the decision maker to introduce his preferences in order to achieve the most preferred solution. This holistic approach let us provide an efficient solution to a complex public investment planning situation, improving the current state of the country relating not only economical aspects, but also social and human development aspects. The real situation studied is focused on Mexico, where, in recent decades, has undergone remarkable improvements in terms of economic growth, which has not been matched by significant improvements in several other basic aspects of human development, nor by reductions in regional inequalities. This suggests the need to establish policies aimed at improving these aspects and reducing inequalities. Federal public investment is an important tool in regional policy to promote and improve these aspects; so we introduce a multiobjective programming problem for planning federal public investment in Mexico. This model will focus on improving national levels in four main dimensions of human development (economic growth, education, health and housing), and on reducing regional inequalities for those dimensions. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n9/abs/jors2009101a.html

Scatter tabu search for multiobjective clustering problems / R. Caballero in Journal of the operational research society (JORS), Vol. 62 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 11 (Novembre 2011) . - pp. 2034–2046 Titre : Scatter tabu search for multiobjective clustering problems Type de document : texte imprimé Auteurs : R. Caballero, Auteur ; M. Laguna, Auteur ; R. Martí, Auteur Année de publication : 2011 Article en page(s) : pp. 2034–2046 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : SSPMO  Multiobjective  optimization  Scatter  and  tabu  search  Combinatorial  data  analysis  Partitioning Index. décimale : 001.424 Résumé : We propose a hybrid heuristic procedure based on scatter search and tabu search for the problem of clustering objects to optimize multiple criteria. Our goal is to search for good approximations of the efficient frontier for this class of problems and provide a means for improving decision making in multiple application areas. Our procedure can be viewed as an extension of SSPMO (a scatter search application to nonlinear multiobjective optimization) to which we add new elements and strategies specially suited for combinatorial optimization problems. Clustering problems have been the subject of numerous studies; however, most of the work has focused on single-objective problems. Clustering using multiple criteria and/or multiple data sources has received limited attention in the operational research literature. Our scatter tabu search implementation is general and tackles several problems classes within this area of combinatorial data analysis. We conduct extensive experimentation to show that our method is capable of delivering good approximations of the efficient frontier for improved analysis and decision making. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n11/abs/jors2010180a.html [article] Scatter tabu search for multiobjective clustering problems [texte imprimé] / R. Caballero, Auteur ; M. Laguna, Auteur ; R. Martí, Auteur . - 2011 . - pp. 2034–2046. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 11 (Novembre 2011) . - pp. 2034–2046 Mots-clés : SSPMO  Multiobjective  optimization  Scatter  and  tabu  search  Combinatorial  data  analysis  Partitioning Index. décimale : 001.424 Résumé : We propose a hybrid heuristic procedure based on scatter search and tabu search for the problem of clustering objects to optimize multiple criteria. Our goal is to search for good approximations of the efficient frontier for this class of problems and provide a means for improving decision making in multiple application areas. Our procedure can be viewed as an extension of SSPMO (a scatter search application to nonlinear multiobjective optimization) to which we add new elements and strategies specially suited for combinatorial optimization problems. Clustering problems have been the subject of numerous studies; however, most of the work has focused on single-objective problems. Clustering using multiple criteria and/or multiple data sources has received limited attention in the operational research literature. Our scatter tabu search implementation is general and tackles several problems classes within this area of combinatorial data analysis. We conduct extensive experimentation to show that our method is capable of delivering good approximations of the efficient frontier for improved analysis and decision making. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n11/abs/jors2010180a.html