Publications ORBi OA
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See detailFrom data collection to map validation: analytical and numerical modelling
Dassargues, Alain ULg; Popescu, Ileana Cristina

in Zwahlen, François (Ed.) Vulnerability and risk mapping for the protection of carbonate (karst) aquifers, COST620 final report (2003)

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See detailSuivi de la végétation en zone sèche par des produits d‘information dérivés de l‘imagerie spatiale
Crépeau, Christian; Bennouna, Taoufiq; Bicheron, Patrice et al

in Science et changements planétaires / Sécheresse (2003), 14(1), 56-57

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See detailIntrinsic vulnerability mapping using the PI method Néblon basin (Belgium)
Lomba, Valérie; Dassargues, Alain ULg

in Zwahlen, François (Ed.) Vulnerability and risk mapping for the protection of carbonate (karst) aquifers, COST620 final report (2003)

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See detailCombining stochastic simulations and inverse modelling for delineation of groundwater well capture zones
Rentier, Céline; Roubens, Marc ULg; Dassargues, Alain ULg

in Iu (Ed.) Computational Methods in Engineering and Science (2003)

In hydrogeology, protection zones of a spring or a pumping well are often delimited by isochrones that are computed using calibrated groundwater flow and transport models. In heterogeneous formations, all ... [more ▼]

In hydrogeology, protection zones of a spring or a pumping well are often delimited by isochrones that are computed using calibrated groundwater flow and transport models. In heterogeneous formations, all direct and indirect data, respectively called hard and soft data, must be used in an optimal way. Approaches involving in situ pumping and tracer tests, combined with geophysical and/or other geological observations, are developed. In a deterministic framework, the calibrated model is considered as the best representation of the reality at the current investigation stage, but result uncertainty remains unquantified. Using stochastic methods, a range of equally likely isochrones can be produced allowing to quantify the influence of our knowledge of the aquifer parameters on protection zone uncertainty. Furthermore, integration of soft data in a conditioned stochastic generation process, possibly associated with an inverse modeling procedure, can reduce the resulting uncertainty. A stochastic methodology for protection zone delineation integrating hydraulic conductivity measurements (hard data), head observations and electrical resistivity data (soft data) is proposed. [less ▲]

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See detailDevelopment of a database linked to a GIS for coupling with groundwater modelling tools
Ruthy, Ingrid ULg; Orban, Philippe ULg; Gogu, Radu Constantin et al

in Iu (Ed.) Computational Methods in Engineering and Science (2003)

Groundwater analysis strongly depends on the availability of large volumes of high-quality data. Putting all data in a coherent and logical structure supported by a computing environment helps ensure ... [more ▼]

Groundwater analysis strongly depends on the availability of large volumes of high-quality data. Putting all data in a coherent and logical structure supported by a computing environment helps ensure validity and availability and provides a powerful tool for hydrogeological studies. A hydrogeological Geographical Information System (GIS) database that offers facilities for hydrogeological modeling has been designed in Belgium for the Walloon Region. Interest is growing in the potential for integrating GIS technology and groundwater simulation models. A “loose-coupling” tool was created between the spatial database scheme and the groundwater numerical model interface GMS© (Groundwater Modeling System). Following time and spatial queries, the hydrogeological data stored in the database can be easily used within different groundwater numerical models. [less ▲]

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See detailNecrotizing varicella zoster virus folliculitis.
Nikkels, Arjen ULg; Pierard, Gérald ULg

in European Journal of Dermatology (2003), 13(6), 587-9

Although the usual clinical features of the varicella zoster virus (VZV)-induced lesions are readily recognized, the same virus is also responsible for a series of atypical lesions. A patient is presented ... [more ▼]

Although the usual clinical features of the varicella zoster virus (VZV)-induced lesions are readily recognized, the same virus is also responsible for a series of atypical lesions. A patient is presented with a single large infiltrated plaque on the abdomen. Although histology showed a necrotizing folliculitis surrounded by a dense perifollicular inflammatory infiltrate, the clinical presentation was not suggestive of folliculitis. Subtle cyto-histological clues for viral infection were suggested. Immunohistochemistry revealed the presence of VZV in the remnants of the follicular structures. This report underlines one of the protean clinical presentations of VZV skin infections and highlights the discreteness of typical VZV-related cyto-histological alterations. Complementary VZV identification methods such as immunohistochemistry, are helpful in order to increase the diagnostic accuracy of unusual VZV lesions. [less ▲]

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See detailL'image du mois. Un chancre mou.
Nikkels, Arjen ULg; Arrese Estrada, Jorge ULg; Pierard, Gérald ULg

in Revue Médicale de Liège (2003), 58(2), 64-6

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See detailStatistique bayésienne des processus ponctuels marqués. Le rôle des variables latentes dans la démarche de modélisation.
Bernier, Jacques; Parent, Eric; Boreux, Jean-Jacques ULg

Conference (2003)

En statistique bayésienne le raisonnement conditionnel est à la base de la solidarité étroite entre modélisation et calcul par algorithmes MCMC. Un des aspects les plus fructueux de son utilisation est l ... [more ▼]

En statistique bayésienne le raisonnement conditionnel est à la base de la solidarité étroite entre modélisation et calcul par algorithmes MCMC. Un des aspects les plus fructueux de son utilisation est l'utilisation explicite des variables latentes ou cachées. On présente trois exemples de séries météorologiques représentées par des modèles de processus ponctuels marqués de complexité croissante. Sur ces exemples on montre la souplesse de modélisation et les facilités de calcul apportées par les variables latentes en relation avec les techniques "d'augmentation de données de Tanner". [less ▲]

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See detailA dual thromboxane inhibitor and thromboxane receptor antagonist prevents pig myocardial infarction induced by coronary thrombosis
Rolin, S.; Petein, M.; Tchana-Sato, Vincent ULg et al

in European Heart Journal (2003), 24(Suppl. S), 325

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See detailUtopie et contre-utopie. La communication allégorique dans Le Comte de Monte-Cristo
Durand, Pascal ULg

in Arrous, M. (Ed.) Dumas, une lecture de l’histoire (2003)

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See detailL'enseignement en Communauté française : un haut degré d'iniquité
Baye, Ariane ULg; Nicaise, Julien; Straeten, Marie-Hélène et al

in Espace de Libertés : Magazine du Centre d'Action Laïque (2003), (316), 16-17

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See detailPurificazione delle proteine associate alla gestazione (PAG) nella bufala (Bubalus bubalis): risultati preliminari.
Barbato, O.; Melo de Sousa, Noelita ULg; Malfatti, A. et al

in Atti 2o Congresso Nazionale sull’Allevamento del Bufalo (2003)

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See detailLa motivation pour la lecture, au-delà d'une simple question de goût
Schillings, Patricia ULg

in Caractères (2003), 10(1), 11-12

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See detailDes profils de motivation pour la lecture en 6e primaire : une approche différenciée
Schillings, Patricia ULg

in Caractères (2003), 10(1), 13-21

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See detailOstie : la reprise des fouilles sur le site de la Schola du Trajan.
Morard, Thomas ULg

in Mélanges de l'Ecole Française de Rome. Italie et Méditérranée (2003), 115(1), 433-443

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See detailTime-dependent behaviour of oil reservoir chalk: A multiphase approach
De Gennaro, Vincenzo; Delage, Pierre; Cui, Yu Jun et al

in Soils and Foundations (2003), 43(4),

In the North Sea Ekofisk oilfield, oil is located in a 300 m thick layer of porous chalk (n = 40-50%) at a 3000 m depth. After the initial phase of depletion an enhanced oil recovery procedure was carried ... [more ▼]

In the North Sea Ekofisk oilfield, oil is located in a 300 m thick layer of porous chalk (n = 40-50%) at a 3000 m depth. After the initial phase of depletion an enhanced oil recovery procedure was carried out by injecting sea water (waterflooding). An unexpected consequence of this waterflooding has been the occurrence of a seafloor subsidence, corresponding up to now to a decrease of the seafloor level of approximately 10 m. It is now well recognised that hydro-mechanical coupling involving multiphase fluid interactions (oil and water) is determinant for the interpretation of the phenomenological aspects associated with the chalk compaction and the related subsidence observed in the North Sea oilfields (Ekofisk reservoir) when water flooded. The subsidence due to waterflooding is interpreted as a collapse phenomenon due to suction decrease, typical of loose and low plasticity unsaturated soils when wetted under load. On the other hand, time-dependent stress-strain behaviour of geomaterials is one of the major concerns in soil mechanics and, in effect, subsidence includes creep effects. A multiphase approach, including creep effects under controlled suction levels, is proposed in this paper; the preliminary results of this study are presented and discussed. Attention will be focused at first on the theoretical approach, supplying the essential elements for the work, and on the interpretation of the experimental results. This will provide secondly the base for formulation and validation of the constitutive law proposed for the description of the time-dependent mechanical behaviour of the chalk. [less ▲]

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