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See detailEtat de l'Environnement Wallon – Chapitre "Odeur"
Nicolas, Jacques ULg

Report (2006)

The report constitutes a part of the Walloon Environmental status. It refers to environmental odours. It inventories the potential odour sources in Wallonia and presents the available data concerning ... [more ▼]

The report constitutes a part of the Walloon Environmental status. It refers to environmental odours. It inventories the potential odour sources in Wallonia and presents the available data concerning complaints and responses of the society to cope with the odour problems. [less ▲]

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See detailContribution à l'état de l'environnement wallon - Partie : pollutions intérieures
Nicolas, Jacques ULg

Report (2006)

The document is a draft version for a contribution to the Walloon environmental state. It concerns the indoor air pollution. It inventory the possibles pollutants, their sources, their health risks, the ... [more ▼]

The document is a draft version for a contribution to the Walloon environmental state. It concerns the indoor air pollution. It inventory the possibles pollutants, their sources, their health risks, the methods to measure them and their actual guideline values. [less ▲]

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See detailRegulated discharge produces important changes of fish community in the grayling zone of a small salmonid stream.
Ovidio, Michaël ULg; Capra, Hervé; Orban, Patrice et al

Conference (2006, June)

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See detailModeling and computing ternary projective relations between regions
Clementini, Eliseo; Billen, Roland ULg

in IEEE Transactions on Knowledge and Data Engineering (2006), 18(6), 799-814

Current spatial database systems offer limited querying capabilities beyond binary topological relations. This paper introduces a model for projective relations between regions to support other ... [more ▼]

Current spatial database systems offer limited querying capabilities beyond binary topological relations. This paper introduces a model for projective relations between regions to support other qualitative spatial queries. The relations are ternary because they are based on the collinearity invariant of three points under projective geometry. The model is built on a partition of the plane into separate zones that are obtained from projective properties of two reference objects: Then, by considering the empty/ nonempty intersections of a primary object with these zones, the model is able to distinguish between 34 different projective relations. Then, the paper proposes original algorithms for computing the relations under the assumption that regions of the plane are stored as vector polygons in a spatial database. These algorithms run in optimal O(n log n) time. [less ▲]

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See detailGroundwater flow and transport delivered for groundwater quality trend forecasting by TREND T2
Orban, Philippe ULg; Brouyère, Serge ULg

Report (2006)

In the framework of Workpackage R3 Meuse, the Hydrogeology Group of the University of Liège (HGULg) develops a groundwater flow and transport model for the Geer sub-catchment (tributary of the Meuse ... [more ▼]

In the framework of Workpackage R3 Meuse, the Hydrogeology Group of the University of Liège (HGULg) develops a groundwater flow and transport model for the Geer sub-catchment (tributary of the Meuse) (Figure 1, Deliverable R3.16 (Orban et al 2006)). In the scope of TREND T2, the model will be used to develop trend forecasting tools. The objective of the deliverable is to describe new concepts for large-scale transport modelling, more particularly a modelling approach, the Hybrid Finite Element Mixing Cell (HFEMC) developed by HGULg and implemented in the 3D simulator SUFT3D. First steps for the application to the Geer basin are also presented. [less ▲]

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See detailSpringback and Twist Prediction of Roll Formed Parts
Bui, Quoc Viet; Boman, Romain ULg; Papeleux, Luc ULg et al

in Santos, Abel D.; Barata da Rocha, A. (Eds.) Proceedings of the IDDRG 2006 International Deep Drawing Research Group, Drawing the things to come, Trends and Advances in Sheet Metal Forming (2006, June)

In the construction market, Roll Forming is the reference forming process. Numerous parts are achieved in such a way: purlins, steeldecks or suspended ceiling parts are examples of it. Roll Forming is ... [more ▼]

In the construction market, Roll Forming is the reference forming process. Numerous parts are achieved in such a way: purlins, steeldecks or suspended ceiling parts are examples of it. Roll Forming is also more and more used in the automotive industry, as it constitutes a good alternative to forming for High Strength Steels. Among the major requirements to obtain a defect-free product are outlined: the accurate geometry of the part, the taking into account of the springback as well as the prediction of twist. Furthermore, the roll forming operation could be only the first forming operation: the part could be curved or locally deep drawn afterwards. FE codes could allow fulfilling these requirements. However, they need significant advances in terms of material model description and numerical development. This paper presents the work done in order to predict the geometry and the behaviour of a roll formed part: First the material is characterized in complex strain paths in order to identify elaborated microstructural model like Teodosiu’s one. This model is able to take into account Bauschinger effect, orthogonal strain paths, isotropic/kinematic hardening. The METAFOR code is then used to have a better understanding of the mechanics of the deformation of the strip during the forming process. Several experimental campaigns were performed on the I-R&D ARCELOR roll forming machine to define a strong database in order to validate the numerical results. The geometry of machine as well as the shape of the channels inside and outside the RF machine were measured. Some experiments were even carried out in order to generate defects like twist in the roll formed profile. [less ▲]

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See detailThe Belgian pilot project for early rehabilitation of nursing personnel suffering from low back pain.
Mairiaux, Philippe ULg; CREYTENS, G.; DELARUELLE, D. et al

in Proceedings ICOH 2006 (2006, June)

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See detailEtude des flux de phosphore à l'exutoire du bassin versant de la Fontaine du Theil (35)
Louvet, Jean-Noël ULg

Master's dissertation (2006)

e phosphore est l’élément de déclenchement et de maîtrise de l’eutrophisation dans les milieux aquatiques continentaux. Afin d’évaluer les rejets de phosphore dus à l’activité agricole, Arvalis Institut ... [more ▼]

e phosphore est l’élément de déclenchement et de maîtrise de l’eutrophisation dans les milieux aquatiques continentaux. Afin d’évaluer les rejets de phosphore dus à l’activité agricole, Arvalis Institut du Végétal en partenariat avec le Cemagref de Rennes a suivi de 1998 à 2004 la qualité de l’eau d’un bassin versant agricole de 128 ha situé à une trentaine de kilomètres au Nord Est de Rennes. Ce bassin est principalement dédié à l’élevage laitier et les agriculteurs, sensibilisés à la protection de l’environnement, ont mis en place des bandes enherbées en bordure du ruisseau de La Fontaine du Theil. Une enquête a montré que les quelques habitations situées sur le bassin et en bordure du bassin, ne rejettent pas de phosphore vers le cours d’eau. Le bassin est donc exclusivement agricole, le pourcentage de surface agricole utile étant de 90%. Dans ces conditions, l’eau du ruisseau a été de bonne qualité si l’on se réfère aux normes du ministère de l’environnement. Cependant les concentrations de phosphore total et de P orthophosphorique se sont avérées très variables en fonction du débit du ruisseau. Chaque crue a provoqué une augmentation brutale des concentrations de P qui ont régulièrement atteint des maxima de 250 µg/L pour le P ortho et de 1000 µg/L pour le P total. En l’absence de crues, les concentrations ont été faibles, proches de 30 µg/L pour le P ortho et de 50 µg/L pour le P total, ce qui correspond à une eau peu propice au déclenchement de l’eutrophisation. Du fait des variations de teneur en P lors des crues, dont la plupart n’a pas été échantillonnée, le calcul des flux de P véhiculés par le ruisseau a nécessité la mise au point d'une équation de prédiction de l’évolution des concentrations de P ortho pendant les crues. Cette équation prédit la concentration moyenne de la crue à partir de la concentration en début de crue et de la variation du débit pendant la crue avec un r 2 égal à 0,81. Pour le P total, une autre équation a permis de prédire le flux de P déplacé par la crue à partir de la lame d’eau et de l’accroissement du débit avec un r 2 égal à 0,95. Ce dernier résultat a toutefois été obtenu en excluant de la régression trois crues exceptionnelles. Ces résultats ont montré que l’évaluation précise du flux de P véhiculé à l’échelle d’un bassin versant, implique une méthode d’échantillonnage adaptée, permettant de prendre en considération les fortes variations de concentrations de P associées aux variations de débit du cours d’eau. [less ▲]

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See detailMatrix elements of SU(6) generators for baryons at arbitrary N-c
Matagne, Nicolas; Stancu, Floarea ULg

in Physical Review D (2006), 73(11),

We present explicit formulas for the matrix elements of the SU(6) generators for totally symmetric spin-flavor states, relevant for baryon spectroscopy in large N-c QCD. We rely on the interplay between ... [more ▼]

We present explicit formulas for the matrix elements of the SU(6) generators for totally symmetric spin-flavor states, relevant for baryon spectroscopy in large N-c QCD. We rely on the interplay between two different methods to calculate these matrix elements. As an outcome, general analytic formulas of the corresponding SU(6) isoscalar factors are derived for arbitrary N-c. These results can be used to study excited states of nonstrange and strange baryons. [less ▲]

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See detailPharmacokinetic study of a new synthetic MMP inhibitor (Ro 28-2653) after IV and oral administration of cyclodextrin solutions
Piette, Marie ULg; Evrard, Brigitte ULg; Frankenne, Francis et al

in European Journal of Pharmaceutical Sciences (2006), 28(3), 189-195

Ro 28-2653 (5-biphenyl-4-yl-5-[4-(4-nitro-phenyl)-piperazin-1-yl]-pyrimidine-2,4,6-trione) is a new synthetic inhibitor of matrix metalloproteinases (MMPs) with a high selectivity towards MMP2, MMP9 and ... [more ▼]

Ro 28-2653 (5-biphenyl-4-yl-5-[4-(4-nitro-phenyl)-piperazin-1-yl]-pyrimidine-2,4,6-trione) is a new synthetic inhibitor of matrix metalloproteinases (MMPs) with a high selectivity towards MMP2, MMP9 and membrane type 1-MMP. It has been shown that cyclodextrins (CDs) are able to form inclusion complexes with Ro 28-2653 and to increase its aqueous solubility. The aim of this study is to demonstrate that an increase in Ro 28-2653 solubility, via ternary complex formation, can lead to an increase in the oral bioavailability of this drug. This study shows that a synergistic effect exists between hydroxypropyl-beta-cyclodextrin (HP-beta-CD) and L-lysine. The use of this multicomponent system enabled the preparation of oral and intravenous solutions of Ro 28-2653. In vivo evaluation of the oral solution of the inclusion complex of Ro 28-2653 in comparison with a suspension of the same uncomplexed drug showed a significant (p < 0.05) increase in absolute bioavailability. The area under curve (AUC) and the peak serum concentration (C-max) were approximately 10 times higher than those obtained with the suspension, while the time (T-max) to reach C-max was reduced. Moreover, in vivo administration of Ro 28-2653 solutions highlighted some information about the pharmacokinetic behavior of Ro 28-2653: a long biologic half-life (about 15.5 h) and a small overall volume of distribution (81). (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailAnalyse de la survie et de la qualité de vie à long terme post-arrêt cardio-respiratoire extra-hospitalier en région liégeoise
Stipulante, Samuel ULg

Master's dissertation (2006)

INTRODUCTION Selon les recommandations - Utstein Style - , de nombreuses études indiquent que la mortalité à court terme après un arrêt cardio-respiratoire extra-hospitalier est élevée dans les différents ... [more ▼]

INTRODUCTION Selon les recommandations - Utstein Style - , de nombreuses études indiquent que la mortalité à court terme après un arrêt cardio-respiratoire extra-hospitalier est élevée dans les différents pays industrialisés étudiés. L’analyse des effets à long terme d’une telle affection relève d’une démarche en santé publique. Dès lors, la présente enquête a étudié le retentissement sur le devenir de ces patients en considérant deux variables : la survie et la qualité de vie. Ces données ont été comparées respectivement avec les normes des populations générales wallonne et liégeoise. METHODOLOGIE Il s’agit d’une étude transversale ayant inclu tous les patients victimes d’un arrêt cardio-respiratoire extra-hospitalier, entre 1997 et 2000, en région liégeoise. La fonction de survie est calculée grâce à la méthode statistique « produit-limite » de Kaplan-Meier ; le niveau de qualité de vie est quant à lui analysé sur base de l’échelle - Medical Outcome Study Short Form 36 -. RESULTATS A 5 ans post arrêt cardio-respiratoire, la proportion cumulée de survivants liégeois est de 61% pour l’ensemble des patients et de 65% pour le sous-groupe - Utstein Style-. La fonction de survie à 5 ans de la population générale wallonne est quant à elle de 94%. Au niveau de la qualité de vie, l’ensemble des patients a montré un niveau de qualité de vie significativement plus élevé que la population générale liégeoise. Dans le sous-groupe - Utstein Style -, la relation est inversée. CONCLUSIONS Au terme de cette étude, la population liégeoise ayant subit un arrêt cardio- respiratoire extra-hospitalier peut se caractériser comme suit : • Espérance de vie réduite par rapport à la population wallonne standardisée âge-sexe • Niveau de qualité de vie supérieure à la population liégeoise standardisée âge-sexe ; cette tendance est inversée pour le sous-groupe - Utstein Style - . [less ▲]

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See detailReversal of temporal and spatial heterogeneities in tumor perfusion identifies the tumor vascular tone as a tunable variable to improve drug delivery
Martinive, Philippe ULg; DE WEVER, Julie; BOUZIN, Caroline et al

in Molecular Cancer Therapeutics (2006), 5(6), 16207

Maturation of tumor vasculature involves the recruitment of pericytes that protect the endothelial tubes from a variety of stresses, including antiangiogenic drugs. Mural cells also provide mature tumor ... [more ▼]

Maturation of tumor vasculature involves the recruitment of pericytes that protect the endothelial tubes from a variety of stresses, including antiangiogenic drugs. Mural cells also provide mature tumor blood vessels with the ability to either relax or contract in response to substances present in the tumor microenvironment. The observed cyclic alterations in tumor blood flow and the associated deficit in chemotherapeutic drug delivery could in part arise from this vasomodulatory influence. To test this hypothesis, we focused on endothelin-1 (ET-1), which, besides its autocrine effects on tumor cell growth, is a powerful vasoconstrictor. We first document that an ETA receptor antagonist induced relaxation of microdissected tumor arterioles and selectively and quantitatively increased tumor blood flow in experimental tumor models. We then combined dye staining of functional vessels, fluorescent microsphere-based mapping, and magnetic resonance imaging to identify heterogeneities in tumor blood flow and to examine the reversibility of such phenomena. Data from all these techniques concurred to show that administration of an ETA receptor antagonist could reduce the extent of underperfused tumor areas, proving the key role of vessel tone variations in tumor blood flow heterogeneity. We also provide evidence that ETA antagonist administration could, despite an increase in tumor interstitial fluid pressure, improve access of cyclophosphamide to the tumor compartment and significantly influence tumor growth. In conclusion, tumor endogenous ET-1 production participates largely in the temporal and spatial variations in tumor blood flow. ETA antagonist administration may wipe out such heterogeneities, thus representing an adjuvant strategy that could improve the delivery of conventional chemotherapy to tumors. [Mol Cancer Ther 2006;5(6):1620–7] [less ▲]

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See detailMere exposure effect : a consequence of direct and indirect fluency-preference links
Willems, Sylvie ULg; Van der Linden, Martial ULg

in Consciousness & Cognition (2006), 15(2), 323-341

In three experiments, picture quality between test items was manipulated to examine whether subjects' expectations about the fluency normally associated with these different stimuli might influence the ... [more ▼]

In three experiments, picture quality between test items was manipulated to examine whether subjects' expectations about the fluency normally associated with these different stimuli might influence the effects of fluency on preference or familiarity-basea recognition responses. The results showed that fluency due to pre-exposure influenced responses less when objects were presented with high picture quality, suggesting that attributions of fluency to preference and familiarity are adjusted according to expectations about the different test pictures. However, this expectations influence depended on subjects' awareness of these different quality levels. Indeed, imperceptible differences seemed not to induce expectations about the test item fluency. In this context, fluency due to both picture quality and pre-exposure influenced direct responses. Conversely, obvious, and noticed, differences in test picture quality did no affect responses, suggesting that expectations moderated attributions of fluency only when fluency normally associated with these different stimuli was perceptible but difficult to assess. (c) 2005 Elsevier Inc. All rights reserved. [less ▲]

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See detailRimonabant improves cardiometabolic risk factors in overweight/obese patients irrespective of treatment with statins: Pooled data from the RIO program
Despres, J. P.; Van Gaal, L.; Scheen, André ULg et al

in Atherosclerosis Supplements (2006, June), 7(3), 329

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See detailVisions d'artistes (éditorial)
Havelange, Carl ULg

in Voir (barré) (2006), 32

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See detailOptimization of a Rolling and Floating Lock Gate for the Port of Antwerp
Richir, Thomas; Pecket, J.-P.; Toderan, C. et al

in ICCC-ASCE: 2006, Int'l Conf. on Computing in Civil Engineering of ASCE, Joint International Conference on Computing and Decision Making in Civil and Building Engineering, Montreal, Canada, June 2006, Paper IC-23, pp155-163 (2006, June)

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See detailSevere pulmonary embolism: Pulmonary artery clot load scores and cardiovascular parameters as predictors of mortality
Ghaye, Benoît ULg; Ghuysen, Alexandre ULg; Willems, V. et al

in Radiology (2006), 239(3), 884-891

Purpose: To retrospectively evaluate pulmonary artery (PA) clot load scores and computed tomographic (CT) cardiovascular parameters as predictors of mortality in patients with severe pulmonary embolism ... [more ▼]

Purpose: To retrospectively evaluate pulmonary artery (PA) clot load scores and computed tomographic (CT) cardiovascular parameters as predictors of mortality in patients with severe pulmonary embolism (PE). Materials and Methods: Institutional review board approval was obtained with waiver of informed consent. A total of 82 consecutive patients (42 women, 40 men; mean age +/- standard deviation, 61 years +/- 15) were admitted to the intensive care unit for PE-related conditions and were evaluated by using CT pulmonary angiography. Two independent readers who were blinded to clinical outcome quantified PA clot load by using four scoring systems. Cardiovascular measurements included right ventricular (RV) and left ventricular (LV) short-axis measurements; RV short axis to LV short axis (RV/LV) ratios; main PA, ascending aorta, azygos vein, and superior vena cava diameters; and main PA diameter to aorta diameter ratios. Reflux of contrast medium into the inferior vena cava, leftward bowing of the interventricular septum, pleural or pericardial effusion, pulmonary consolidation, infarct, platelike atelectasis, and mosaic ground-glass opacity were also recorded. Results were correlated with patient outcome during hospital stay by using the Wilcoxon rank sum and x(2) tests. Results: Twelve patients died within 1-14 days. RV and LV short axis; RV/LV ratio; azygos vein, superior vena cava, and aorta diameters; and contrast medium reflux into the inferior vena cava were significantly different between survivors and nonsurvivors (P <.05). No significant relationship was found between PA clot load and mortality rate. RV/LV ratio and azygos vein diameter allowed correct prediction of survival in 89% of patients (P <.001). Conclusion: RV/LV ratio and azygos vein diameter are predictors of mortality in patients with severe PE. (c) RSNA, 2006 [less ▲]

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