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See detailThe spectrum of the roAp star HD 101065 (Przybylski's star) in the Li I 6708 A spectral region
Shavrina, A V; Polosukhina, N S; Pavlenko, Ya V et al

in Astronomy and Astrophysics (2003), 409

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See detailInvestigation of transverse cracks initiation in continuous steel casting using a finite element approach
Castagne, S.; Habraken, Anne ULg

in Advances in Computational & Experimental Engineering (2003)

A numerical model for steel at elevated temperature which is based on a mesoscopic finite element approach is presented. The objective of the research is the analysis of damage evolution in the material ... [more ▼]

A numerical model for steel at elevated temperature which is based on a mesoscopic finite element approach is presented. The objective of the research is the analysis of damage evolution in the material using information from the macroscopic and microscopic scales. As a final application our results are used to study the industrial process of continuous casting of low carbon steel. [less ▲]

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See detailFinite element analysis of continuous steel casting
Castagne, S.; Pascon, Frédéric ULg; Miesse, G. et al

in Proceedings of the First International Conference Finite element for process analysis (2003)

In order to analyse the behaviour of steel during continuous casting and to improve the process, two complementary models of steel continuous casting using the finite element code LAGAMINE have been ... [more ▼]

In order to analyse the behaviour of steel during continuous casting and to improve the process, two complementary models of steel continuous casting using the finite element code LAGAMINE have been developed. We propose here a description of both macroscopic and mesoscopic approaches. The first one describes the whole continuous casting process, from the free surface in the mould and through the entire machine, including thermal and mechanical behaviour of the steel. The second approach focuses on the prediction of cracks and is developed at the grain scale. Results concerning the optimisation of the mould taper and the analysis of transverse cracks initiation are presented as industrial applications. [less ▲]

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See detailDevelopments in finite element simulations of continuous casting
Castagne, S.; Pascon, Frédéric ULg; Bles, G. et al

in Proceedings of the 2nd International Conference on Thermal Process Modelling and Computer Simulations (ICTPMCS) (2003)

Two complementary approaches of steel continuous casting modelling using the finite element code LAGAMINE have been developed in the M&S Department. We propose here a description of the context in which ... [more ▼]

Two complementary approaches of steel continuous casting modelling using the finite element code LAGAMINE have been developed in the M&S Department. We propose here a description of the context in which the study started, then a description of both macroscopic and mesoscopic approaches. The first one describes the whole continuous casting process, from the free surface in the mould and through the entire machine, including thermal and mechanical behaviour of the steel. The second approach focuses on the prediction of cracks and is developed at the grain scale. Some results are also presented for both models. [less ▲]

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See detailEGF amplifies the replacement of parvalbumin-expressing striatal interneurons after ischemia.
Teramoto, Tetsuyuki; Qiu, Jianhua; Plumier, Jean-Christophe ULg et al

in Journal of Clinical Investigation (2003), 111(8), 1125-32

EGF promotes proliferation and migration of stem/progenitor cells in the normal adult brain. The effect of epidermal growth factor on neurogenesis in ischemic brain is unknown, however. Here we show that ... [more ▼]

EGF promotes proliferation and migration of stem/progenitor cells in the normal adult brain. The effect of epidermal growth factor on neurogenesis in ischemic brain is unknown, however. Here we show that intraventricular administration of EGF and albumin augments 100-fold neuronal replacement in the injured adult mouse striatum after cerebral ischemia. Newly born immature neurons migrate into the ischemic lesion and differentiate into mature parvalbumin-expressing neurons, replacing more than 20% of the interneurons lost by 13 weeks after ischemia and representing 2% of the total BrdU-labeled cells. These data suggest that administration of EGF and albumin could be used to manipulate endogenous neurogenesis in the injured brain and to promote brain self-repair. [less ▲]

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See detailBiostratigraphic correlation at the Late or/and Latest Famennian from Western, Central and Eastern European sections. State of the art.
Streel, Maurice ULg; Avkhimovitch, V.I.; Berkowski, B et al

in Newsletter. Subcommission on Devonian Stratigraphy (2003), 19

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See detailUne approche par les compétences pour l’apprentissage des soins infirmiers. Analyse des pratiques des enseignants.
Dury, Cécile ULg

in Recherche en Soins Infirmiers (2003), 73(Juin), 4-40

The aims of this qualitative research is to understand how the teaching methods of nursing teachers inhance the student's competencies development. Eight nursing teachers were interviewed in a non ... [more ▼]

The aims of this qualitative research is to understand how the teaching methods of nursing teachers inhance the student's competencies development. Eight nursing teachers were interviewed in a non-directive approach. The data were analysed with a qualitative method: "structural analysis method". The results showed that their methods are in majority in a transmissive and behavioral model; an inadequacy between teaching methods and pedagogical goals; an abivalent and unclear understanding of their role; a lack of coherence in the assesment methods. To conclude, various strategies are proposed on institutional and national levels to support the implementation of a competence-based approach in nursing training. [less ▲]

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See detailUne recherche-action pour développer les capacités de compréhension de l’écrit en 1re accueil … Premier bilan
Schillings, Patricia ULg; Poncelet, Débora

in Point sur la Recherche en Education (Le) (2003)

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See detailEstimation of habitat quality based on plant community, and effects of isolation in a network of butterfly habitat patches
Sawchik, J.; Dufrêne, Marc ULg; Lebrun, Philippe

in Acta Oecologica (2003), 24(1), 25-33

Minimum viable site networks are crucial for many threatened species but their design is always a difficult procedure. The present study investigated methods to estimate habitat quality of patches, in an ... [more ▼]

Minimum viable site networks are crucial for many threatened species but their design is always a difficult procedure. The present study investigated methods to estimate habitat quality of patches, in an ecological network for five butterfly species (Brenthis ino, Clossiana selene, Lycaena helle, Lycaena hippothoe, Proclossiana eunomia) inhabiting wet meadows. Abundance predictions were performed on the basis of botanical relevés with a multiple-species approach combining canonical correspondence analysis and multiple regression. Models are defined on a reference site set and are evaluated on a test site set. All the fitted models predicted the abundance of the butterfly species considerably well (from 61 to 86% of the variation). We evaluated the potential consequences of isolation on local populations, by comparing predicted and observed abundance. It was expected that greater differences would be observed when sites were more isolated. On the test set, differences between predicted and observed abundance were largely correlated to site isolation for L. helle and P. eunomia. The most isolated sites had greater chances to be empty, even if they had high-quality habitat. Reciprocally, when the sites were less isolated, the abundance observed was always greater than predicted, seeming to confirm the role of rescue effects. © 2003 Éditions scientifiques et médicales Elsevier SAS. All rights reserved. [less ▲]

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See detailMise au point d’une procédure de caractérisation quantitative des surfaces démolies en béton en vue de travaux de réfection
Bélair, Normand; Bissonnette, Benoît; Courard, Luc ULg

in Progression de la recherche québécoise sur les ouvrages d'art (2003)

Cet article présente l’état d’avancement d’un projet visant le développement et la validation d’une technique permettant de caractériser de façon quantitative l’intégrité mécanique d’une surface en béton ... [more ▼]

Cet article présente l’état d’avancement d’un projet visant le développement et la validation d’une technique permettant de caractériser de façon quantitative l’intégrité mécanique d’une surface en béton préparée (démolie) aux fins de travaux de réfections superficielles. Dans un premier temps, une étude de l’influence des variables de base (taille des pastilles métalliques, profondeur de forage, nature de l’adhésif, etc.) relatives à l’essai d’arrachement sur la cohésion du béton a été réalisée afin d’optimiser la procédure expérimentale. De plus, les performances comparatives de deux dispositifs d’essai disponibles commercialement ont été évaluées afin d’identifier l’appareil le mieux adapté (facilité et rapidité d’exécution, efficacité, reproductibilité, coût, etc.). Afin de valider le protocole expérimental retenu et d’évaluer quantitativement les effets du mode de démolition, des essais d’arrachement ont été réalisés en laboratoire sur une série d’éléments en béton dont la surface a été préparée au moyen de différentes méthodes de préparation, notamment le marteau pneumatique, la scarification, le jet de sable et le jet d’eau. Une technique de caractérisation quantitative de la rugosité de surface a également été élaborée. Sur la base de ces essais, il est possible d’établir l’influence du mode de démolition sur l’intégrité mécanique de la surface obtenue et d’émettre des recommandations préliminaires. [less ▲]

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See detailHydrodynamique et morphologie d'une bactérie filamenteuse dans un fermenteur à cuve agitée
Groslambert, Sylvie ULg; Blacher, Silvia ULg; Crine, Michel ULg

in Tribune de l'Eau (La) (2003), 56(622), 58-64

Afin d'étudier l'influence de l'hydrodynamique sur une bactérie filamenteuse, Actinomadura R39, nous l'avons cultivée dans un fermenteur de laboratoire de 5 litres à cuve agitée en faisant varier les ... [more ▼]

Afin d'étudier l'influence de l'hydrodynamique sur une bactérie filamenteuse, Actinomadura R39, nous l'avons cultivée dans un fermenteur de laboratoire de 5 litres à cuve agitée en faisant varier les conditions d'agitation. Les variables sont la vitesse de rotation et le type de mobile utilisé: turbines Rushton ou Intermig. Les deux mobiles se distinguent par leur géométrie et par les schémas d'écoulement qu'ils induisent dans la cuve. L'influence de l'hydrodynamique sur Actinomadura R39 est quantifiée par l'évolution de sa morphologie. Cette dernière est estimée par analyse d'images sur des échantillons prélevés lors des cultures. Parallèlement, nous avons caractérisé l'hydrodynamique du fermenteur dans un milieu artificiel reproduisant la rhéologie des fermentations en mesurant la puissance dissipée et en effectuant des essais de traceurs. Ces derniers sont utilisés pour la modélisation du fermenteur par un modèle compartimenté et le calcul du temps de mélange. Nous avons pu ainsi mettre en relation les modifications de la morphologie et des grandeurs caractérisant les écoulements dans le fermenteur. L'existence de corrélations entre les paramètres du modèle et la morphologie a également permis une validation de la signification physique de ce modèle. [less ▲]

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See detailMechanical behaviour of chalk reservoirs: numerical modelling of water sensitivity effects
Collin, Frédéric ULg; Cui, Yu Jun; Schroeder, Christian ULg et al

Conference (2003)

Chalk is the constituent material of numerous oil reservoirs in North Sea. The mechanical behaviour of a saturated chalk has been largely studied. However, different aspects of its behaviour are not yet ... [more ▼]

Chalk is the constituent material of numerous oil reservoirs in North Sea. The mechanical behaviour of a saturated chalk has been largely studied. However, different aspects of its behaviour are not yet well understood: material characteristics depend on the saturating fluids and chalk response is time-dependent. This paper proposes the PASACHALK numerical model: an elasto-plastic constitutive law is presented, which reproduces the different plastic mechanisms of the chalk (pore collapse and shear failure) and the influence of pore fluids. The water sensitivity of this soft rock is explained by the existence of suction effects in chalk. Finally, a simulation of a hypothetical reservoir is proposed to show the response of the elasto-plastic model during depletion phase and water injection phase. [less ▲]

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See detailEvolutionary ecology of paedomorphosis in the Alpine newt Triturus alpestris
Denoël, Mathieu ULg

Conference (2003)

Paedomorphosis, in which individuals retain ancestral characteristics in the adult stage, is widespread in newts and salamanders and is suspected to play an important role in evolution. In some species ... [more ▼]

Paedomorphosis, in which individuals retain ancestral characteristics in the adult stage, is widespread in newts and salamanders and is suspected to play an important role in evolution. In some species, paedomorphosis is facultative with some individuals skipping the metamorphic stage. Dimorphic populations of the Alpine newt inhabit a large variety of aquatic habitats such as permanent lakes and temporary ponds. The aim of this study was to determine the benefits of the alternatives in these different habitats. To this end, I focused on resource partitioning, energy intake, body condition and age structures in different populations composed of the two morphs. In deep lakes, there was a substantial trophic differentiation between morphs. Paedomorphs primarily preyed on plankton whereas metamorphs foraged on terrestrial invertebrates that fell to the water surface. By reducing competition, resource partitioning may contribute to the coexistence of the alternative morphs in heterogeneous habitats. On the contrary, in a small pond, resource use was similar in the two morphs. Maturity is reached earlier in the paedomorphs from this small pond than in metamorphs (progenetic process), favoring then a rapid turn-over of the population, while similar gonadal development was observed in one of the deep lakes (neotenic process). Body condition was generally higher in paedomorphs than in metamorphs in each studied population. These results show that facultative paedomorphosis is adaptive in varied habitats, but that different factors may favor it depending of the characteristics of the environment. Paedomorphic phenotypes can thus be selected in low altitude productive ponds and high altitude oligotrophic lakes. [less ▲]

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See detailOxytocin and vasopressin autocrine/paracrine signaling in small cell lung carcinoma
Pequeux, Christel ULg; Keegan, B. P.; Hagelstein, Marie-Thérèse ULg et al

in International Journal of Molecular Medicine (2003), 12/S1

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See detailDes différences liées au sexe : pas si simple
Blondin, Christiane ULg; Lafontaine, Dominique ULg

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2003), 15-16

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See detailLes interactions entre l'homme et les animaux familiers : quelques champs d'investigation et réflexions méthodologiques
Servais, Véronique ULg; Millot, Jean-Louis

in Baudouin, Claude (Ed.) L'éthologie appliquée aujourd'hui. Tome 3, l'éthologie humaine (2003)

Le paper synthetizes the main studies in the field of human-animal interactions and points to some pitfalls in the methodologies of many researches.

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See detailInfluence du contenu et des modalités d'évaluation sur les indicateurs d'équité
Lafontaine, Dominique ULg; Monseur, Christian ULg

in Actes du 16e colloque international de l'Admée-Europe, Liège, 4-6 septembre 2003 (2003)

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See detailDéverouiller le potentiel de l'eau en agriculture
Klohn, Wulf; Mollinga, Peter; Paranjape, K.J. Joy et Suhas et al

in Déverouiller le potentiel de l'eau en agriculture (2003)

A l’occasion du troisième Forum mondial de l’eau (WWF-3), qui se tient à Kyoto, au Japon, du 16 au 23 mars 2003, l’Organisation des Nations Unies pour l’alimentation et l’agriculture (FAO) présente un ... [more ▼]

A l’occasion du troisième Forum mondial de l’eau (WWF-3), qui se tient à Kyoto, au Japon, du 16 au 23 mars 2003, l’Organisation des Nations Unies pour l’alimentation et l’agriculture (FAO) présente un panorama des thèmes prioritaires que doivent aborder les responsables agricoles du monde entier en matière de mise en valeur des eaux en agriculture, et plus généralement de leurs répercussions sur la gestion des ressources en eau. La FAO a inscrit sa participation aux débats du WWF-3 de Kyoto sous le mot d’ordre «déverrouiller le potentiel de l’eau en agriculture». En effet, tous les renseignements statistiques confirment que l’agriculture est le secteur clé de la gestion de l’eau, pour le présent comme pour les décennies à venir. Pourtant, le secteur de la mise en valeur rurale des eaux se voit actuellement refuser un statut prioritaire dans les forums internationaux, par comparaison avec d’autres domaines concurrents. Il manque pour l’heure aux acteurs qui soutiennent ce secteur une stratégie valide et une présentation valorisante qui leur permettraient de maintenir l’attention sur ces questions. Des arguments nouveaux et puissants sont nécessaires pour remettre la mise en valeur rurale des eaux sur les rails. [less ▲]

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See detailZoogeography of the chromosomal races of the garden dormouse, Eliomys quercinus, in France
Ramalhinho, Maria da Graça; Libois, Roland ULg; Lestro, Maria et al

Poster (2003)

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See detailLa sous-traitance: développements récents
Kohl, Benoît ULg

in Vanwijck, Michèle (Ed.) Contrat d'entreprise et droit de la construction (2003)

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