References of "2006"
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See detailHotelling's T 2 control chart with double warning lines
Faraz, Alireza ULg; Parsian, Ahmad

in Statistical Papers (2006), 47(4), 569-593

Recent studies have shown that the T 2 control chart with variable sampling intervals (VSI) and/or variable sample sizes (VSS) detects process shitis faster than the traditional T 2 chart. This article ... [more ▼]

Recent studies have shown that the T 2 control chart with variable sampling intervals (VSI) and/or variable sample sizes (VSS) detects process shitis faster than the traditional T 2 chart. This article extends these studies for processes that are monitored with VSI and VSS using double warning lines ( T 2 - DWL ). It is assumed that the length of time the process remains in control has exponential distribution. The properties of T 2- DWL chart are obtained using Markov chains. The results show that the T 2 - DWL chart is quicker than VSI and/or VSS charts in detecting almost all shifts in the process mean. [less ▲]

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See detailA New Discontinuous Galerkin Formulation for Non-Linear Elasticity
Noels, Ludovic ULg; Chandran, Ram B; Radovitzky, Raul

Conference (2006)

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See detailCapital social et résultats sociaux de l'éducation
Baye, Ariane ULg; Mainguet, Christine ULg

in Houard, Jean; Jacquemain, M. (Eds.) Capital social et dynamique régionale (2006)

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See detailEffect of excavation induced fractures on radionuclide migration through the Boom Clay (Belgium)
Huysmans, Marijke; Berckmans, Arne; Dassargues, Alain ULg

in Applied Clay Science (2006), 33(3-4), 207-218

In Belgium, the Boom Clay is being evaluated as a potential host formation for the disposal of high-level nuclear waste. In order to investigate this option, an underground research facility composed of ... [more ▼]

In Belgium, the Boom Clay is being evaluated as a potential host formation for the disposal of high-level nuclear waste. In order to investigate this option, an underground research facility composed of two access shafts and 200m of galleries was excavated. Excavation induced fractures were observed in a zone of approximately 1 m around the galleries. In this study, the potential effect of these fractures on radionuclide migration in the Boom Clay is investigated. Therefore, a hydrogeological model of the clay is built with a radionuclide source in the middle of the clay layer surrounded by different fracture configurations. Two types of fracture configurations are inserted in the model. The first type of fracture properties is drawn stochastically from the probability distributions of the properties of the fractures observed around previously excavated galleries. These fracture patterns are considered to be realistic although in this study it is conservatively assumed that no self-sealing occurs. The model is run for a large number of stochastically drawn fracture configurations and the results are compared to a model without fractures. These calculations show that the radionuclide fluxes through the clay are not significantly influenced by these fractures. For the second type of fracture configurations, the fracture properties are varied over a much larger range. Hypothetical fractures with much higher values of fracture extent, aperture, dip and frequency than observed are modeled, With these hypothetical fracture configurations, the critical values of the fracture parameters are determined that must be exceeded to have a significant effect on the radionuclide fluxes through the clay. These calculations show that the extent of the fractured zone has the largest effect on radionuclide migration. The other fracture parameters (aperture, spacing and dip) have a limited effect on the radionuclide fluxes. To obtain a total radionuclide flux through the lower clay boundary that is respectively 10%, 50% and 100% larger than without a fractured zone, the extent of the hypothetical fractured zone should be respectively 27.97 m, 43.86 m and 46.92 m. Such fractures are not expected to be generated by mechanical excavation in the Boom Clay. The obtained critical extent values of the hypothetical fractures are a factor 30 to 40 higher than the measured values of the extent of the excavation disturbed zone. These calculations thus indicate that it is very unlikely that the extent of the fractured zone around the galleries will be large enough to have a significant effect on the radionuclide fluxes through the Boom Clay. This conclusion is further supported by the conservative assumption that no self-sealing occurs. These calculations can function as a preliminary robustness test in ongoing safety analysis studies. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailIl destino della scrittura (postfazione)
Ricciardi, Stefania ULg; Veronesi, Sandro

in Occhio per occhio: La pena di morte in 4 storie [1992] (2006)

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See detailManaging CSR in Complex Environments : Stakeholder Theory in Action
Xhauflair, Virginie ULg; Zune, Marc

in Allouche, José (Ed.) Corporate Social Responsibility : Performances and Stakeholders (2006)

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See detailHigh-Resolution GC Coupled to High-Resolution MS in the Analysis of Dioxins and Related Substances, Principles and Applications
Eppe, Gauthier ULg; De Pauw, Edwin ULg; Focant, Jean-François ULg

in Niessen, W. M. A. (Ed.) The Encyclopedia of Mass Spectrometry, Volume 8, Hyphenated Methods (2006)

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See detailLe rôle pivot des variables latentes pourle raisonnement statistique conditionnel. Exemples d'applications environnementales des processus ponctuels marqués.
Parent, E.; Bernier, J.; Boreux, Jean-Jacques ULg

in Revue de Statistique Appliquée (2006), 54(4), 85-111

En statistique bayésienne, le raisonnement conditionnel probabiliste fonde la solidarité étroite entre modélisation et inférence. Dans le cadre de ce raisonnement, un rôle pivot est joué par les variables ... [more ▼]

En statistique bayésienne, le raisonnement conditionnel probabiliste fonde la solidarité étroite entre modélisation et inférence. Dans le cadre de ce raisonnement, un rôle pivot est joué par les variables latentes. Ce mode de raisonnement peut s’avérer utile aussi en statistique fréquentiste. On présente trois séries hydrométéorologiques décrites par des modèles de processus ponctuels marqués de complexité croissante. Sur ces exemples, on montre comment récolter les fruits de la souplesse de modélisation et des facilités de calcul apportées par les variables latentes. Ces variables améliorent la conceptualisation de variables de structure dans les modèles statistiques et permettent aux calculs d’inférence de bénéficier des algorithmes MCMC en relation avec les techniques «d’augmentation de données». [less ▲]

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See detailCompte rendu de l'ouvrage collectif : Medieval Virginities
Delfosse, Annick ULg

in Moyen Age (Le) (2006), 112(2), 402-403

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See detailColour removal from wastewater by means of microbial treatment
Janeczko, M.; Georgiev, P.; Nicolova, M. et al

in Fecko, P. (Ed.) 10-th Conference on Environment and Mineral Processing (2006)

Water solutions of different dyes used in textile industry (Reactive Black 5, Acid Orange 7 and Disperse Yellow 5) were treated under laboratory conditions by means of different microorganisms or their ... [more ▼]

Water solutions of different dyes used in textile industry (Reactive Black 5, Acid Orange 7 and Disperse Yellow 5) were treated under laboratory conditions by means of different microorganisms or their metabolites. The following organisms were used in this study: Bacillus megatherium, B.subtilus, B.circulans, activated sludge from industrial w. w. teratment plant and a mixed enriched culture of flocculating bacteria. It was find out that the microbial effect towards the dyes was quite specific and the extent of colour removal varied in broad range. Very good results were achieved also by means of permeable reactive barriers inhabitated by flocculating bacteria and other independent microorganisms and operating under continuous flow conditions. The colour removal in these case varied in the range of about 80 - 90 % and was similar to that achieved by the well known chemical reagents used in the textile industry. [less ▲]

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See detailCompte rendu des actes du colloque : Identités franciscaines à l’âge des réformes
Delfosse, Annick ULg

in Moyen Age (Le) (2006), 112(3-4), 692-693

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See detailOrigine biogénétique des triterpènes pentacycliques présents dans la sécrétion défensive de Platyphora Kollari (Chrysomelidae)
Ghostin, Jean; Laurent, Pascal ULg; Daloze, Désiré et al

Poster (2006)

Les chrysomèles sont des insectes phytophages brillement colorés qui représentent une des famille (Chrysomelidae) les plus importante de l'ordre des coléoptères. Etant aposématiques, ils sont facilement ... [more ▼]

Les chrysomèles sont des insectes phytophages brillement colorés qui représentent une des famille (Chrysomelidae) les plus importante de l'ordre des coléoptères. Etant aposématiques, ils sont facilement repérables par des prédateurs potentiels et ont, au cours de l'évolution, développé des mécanismes de défense chimique élaborés. La découverte de glycosides triterpéniques basés sur le squelette oléanane a soulevé le problème de leur origine biogénétique. En effet, il est bien connu que les insectes ne possèdent pas la squalène synthase, une enzyme indispensable à la formation des stéroïdes et des triterpènes pentacycliques. Dès lors, une biosynthèse de novo de ce type de dérivé est peu probable. Par ailleurs, l'analyse de la plante hôte des chrysomèles a montré que la séquestration des glycosides au départ de cette plante est également exclue. Une troisième possibilité serait que l'insecte utilise un précurseur provenant de son alimentation pour fabriquer ses substances défensives. Un tel précurseur pourrait être la b-amyrine identifiée chez différentes plantes hôtes des chrysomèles ou l'acide oléanolique dont la structure de base se retrouve au niveau des triterpènes défensifs. Enfin, l'analyse des plantes hôtes a montré que celles-ci contiennent à la fois de la b-amyrine et de l'a-amyrine dans un rapport 1,76/1. Cependant aucun glycoside triterpénique basé sur le squelette ursane n'a été isolé jusqu'à présent chez les chrysomèles, ce qui suggère un mécanisme de transport sélectif en faveur de la b-amyrine. Dans le cadre de ce travail, nous présenterons les synthèses d'a-amyrine, de b-amyrine et d'acide oéanolique trideutériés, ainsi que les résultats d'incorporation des deux premiers précurseurs chez Platyphora kollari. [less ▲]

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See detailPolitiques actives d’emploi et professionnels de l’employabilité : critique et clinique
Orianne, Jean-François ULg

in Travail Emploi Formation (2006), 6/2006

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