Documents disponibles écrits par cet auteur

Local search-based metaheuristics for the split delivery vehicle routing problem / U. Derigs 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. 1356–1364 Titre : Local search-based metaheuristics for the split delivery vehicle routing problem Type de document : texte imprimé Auteurs : U. Derigs, Auteur ; B. Li, Auteur ; U. Vogel, Auteur Année de publication : 2011 Article en page(s) : pp. 1356–1364 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Heuristics  Local  search  Split  deliveries  Transport  Vehicle  routing Index. décimale : 001.424 Résumé : The split delivery vehicle routing problem is a variant of the standard vehicle routing problem where the single-visit assumption is waived and a customer might be served on more than one vehicle tour. In this article we report on a study where we have applied the standard local search-based metaheuristics using adaptations of the most widely used inter-tour and intra-tour exchange operators for solving the standard vehicle routing problem now allowing splitting and joining of deliveries. As we will show we could find new best solutions for 51 out of 57 benchmark instances, which have been defined for this problem class. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n9/abs/jors2009100a.html [article] Local search-based metaheuristics for the split delivery vehicle routing problem [texte imprimé] / U. Derigs, Auteur ; B. Li, Auteur ; U. Vogel, Auteur . - 2011 . - pp. 1356–1364. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 61 N° 9 (Septembre 2010) . - pp. 1356–1364 Mots-clés : Heuristics  Local  search  Split  deliveries  Transport  Vehicle  routing Index. décimale : 001.424 Résumé : The split delivery vehicle routing problem is a variant of the standard vehicle routing problem where the single-visit assumption is waived and a customer might be served on more than one vehicle tour. In this article we report on a study where we have applied the standard local search-based metaheuristics using adaptations of the most widely used inter-tour and intra-tour exchange operators for solving the standard vehicle routing problem now allowing splitting and joining of deliveries. As we will show we could find new best solutions for 51 out of 57 benchmark instances, which have been defined for this problem class. DEWEY : 001.424 ISSN : 0361-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v61/n9/abs/jors2009100a.html

Transmission electron microscopy study of stacking faults and their interaction with pyramidal dislocations in deformed Mg / B. Li in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 173–179 Titre : Transmission electron microscopy study of stacking faults and their interaction with pyramidal dislocations in deformed Mg Type de document : texte imprimé Auteurs : B. Li, Auteur ; P.F. Yan, Auteur ; M.L. Sui, Auteur Année de publication : 2010 Article en page(s) : pp. 173–179 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Dislocations  Stacking  fault  Magnesium  TEM Résumé : We present transmission electron microscopy (TEM) observations of stacking faults (SFs) and their interactions with pyramidal dislocations, in plastically deformed polycrystalline pure magnesium. We have observed well-defined fringes as well as streaking in diffraction patterns, typical of SFs. The basal SFs are decorated by a large number of dark speckles, which are created by the interaction with pyramidal dislocations that have both 〈c〉 and 〈a〉 components as revealed by our contrast analysis. The SFs do not appear to result from the splitting of unit dislocations, as the SFs are relatively wide and no dislocation nodes were observed. By tilting the specimen systematically inside TEM, the SFs and the associated dislocations in Mg are found to exhibit a rich variety of features in terms of their morphology and diffraction contrast. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005904 [article] Transmission electron microscopy study of stacking faults and their interaction with pyramidal dislocations in deformed Mg [texte imprimé] / B. Li, Auteur ; P.F. Yan, Auteur ; M.L. Sui, Auteur . - 2010 . - pp. 173–179. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 173–179 Mots-clés : Dislocations  Stacking  fault  Magnesium  TEM Résumé : We present transmission electron microscopy (TEM) observations of stacking faults (SFs) and their interactions with pyramidal dislocations, in plastically deformed polycrystalline pure magnesium. We have observed well-defined fringes as well as streaking in diffraction patterns, typical of SFs. The basal SFs are decorated by a large number of dark speckles, which are created by the interaction with pyramidal dislocations that have both 〈c〉 and 〈a〉 components as revealed by our contrast analysis. The SFs do not appear to result from the splitting of unit dislocations, as the SFs are relatively wide and no dislocation nodes were observed. By tilting the specimen systematically inside TEM, the SFs and the associated dislocations in Mg are found to exhibit a rich variety of features in terms of their morphology and diffraction contrast. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005904