References of "Scientific congresses and symposiums"
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See detailImpact of Prosthesis-Patient Mismatch on Survival following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2006)

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See detailMulti-area security assessment: results using efficient bounding method
Wehenkel, Louis ULg; Glavic, Mevludin; Ernst, Damien ULg

in Proceedings of the 38th North American Power Symposium (NAPS 2006) (2006)

We present our recent results on using previously introduced framework for multi-area security assessment in large interconnections. The basic idea of the framework is exchanging just enough information ... [more ▼]

We present our recent results on using previously introduced framework for multi-area security assessment in large interconnections. The basic idea of the framework is exchanging just enough information so that each operator can evaluate the impact in his control area of contingencies both internal and external to his area. We provide illustrations based on a localization concept known as efficient bounding method and recently introduced approximate DC model of the European interconnected system. In this paper we focus on four transmission system operators (within the approximate DC model): Belgium, France, Germany, and Netherlands (for both Summer and Winter-peak load conditions). [less ▲]

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See detailImpact of Prosthesis-Patient Mismatch on Survival After Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2006)

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See detailAutomatic learning of sequential decision strategies for dynamic security assessment and control
Wehenkel, Louis ULg; Glavic, Mevludin; Geurts, Pierre ULg et al

in Proceedings of the IEEE Power Engineering Society General Meeting 2006 (2006)

This paper proposes to formulate security control as a sequential decision making problem and presents new developments in automatic learning of sequential decision making strategies from simulations and ... [more ▼]

This paper proposes to formulate security control as a sequential decision making problem and presents new developments in automatic learning of sequential decision making strategies from simulations and/or information collected from real-life system measurements. The exploitation of these methods for the design of decision making strategies and control policies in the context of preventive and emergency mode dynamic security assessment and control is discussed and further opportunities for research in this area are highlighted. [less ▲]

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See detailBiological Image Classification with Random Subwindows and Extra-Trees
Marée, Raphaël ULg; Geurts, Pierre ULg; Wehenkel, Louis ULg

Conference (2006)

We illustrate the potential of our image classification method on three datasets of images at different imaging modalities/scales, from subcellular locations up to human body regions. The method is based ... [more ▼]

We illustrate the potential of our image classification method on three datasets of images at different imaging modalities/scales, from subcellular locations up to human body regions. The method is based on random subwindows extraction and the combination of their classification using ensembles of extremely randomized decision trees. [less ▲]

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See detailLes motifs concrets du front dans l’expression lyrique d’Apollinaire
Purnelle, Gérald ULg

in Debon, Claude (Ed.) L’Écriture en guerre de Guillaume Apollinaire. Actes du 19e colloque international de Stavelot (2006)

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See detailThe tropical collections of the University of Liège Museum of Zoology: diversity, database and access.
Loneux, Michèle ULg

in Segers, Hendrik; Desmet, P.; Baus (Eds.) Proceedings of the 3rd GBIF Science Symposium, Brussels 18-19 April 2005 - Tropical Biodiversity: Science, Data, Conservation. (2006)

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See detailEnsembles of extremely randomized trees and some generic applications
Wehenkel, Louis ULg; Ernst, Damien ULg; Geurts, Pierre ULg

in Proceedings of Robust Methods for Power System State Estimation and Load Forecasting (2006)

In this paper we present a new tree-based ensemble method called “Extra-Trees”. This algorithm averages predictions of trees obtained by partitioning the inputspace with randomly generated splits, leading ... [more ▼]

In this paper we present a new tree-based ensemble method called “Extra-Trees”. This algorithm averages predictions of trees obtained by partitioning the inputspace with randomly generated splits, leading to significant improvements of precision, and various algorithmic advantages, in particular reduced computational complexity and scalability. We also discuss two generic applications of this algorithm, namely for time-series classification and for the automatic inference of near-optimal sequential decision policies from experimental data. [less ▲]

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See detailEtude de l'influence des paramètres de pré-abattage sur le pH des carcasses de porc.
Sindic, Marianne ULg; Mertens, Gilles; Renkens, M. et al

in Viandes et Produits carnés - Hors série (2006)

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See detailNon Gaussian Response of Bridges Subjected to Turbulent Wind – Effect of the non Linearity of Aerodynamic Coefficients
Denoël, Vincent ULg; Degée, Hervé ULg

in Proceedings of the 3rd European Conference on Computational Solid and Structural Mechanics (2006)

In the context of a non linear quasi-steady wind loading, this paper shows the importance of the non linearity of the wind loading. More particularly, it focuses of the influence, on the structural ... [more ▼]

In the context of a non linear quasi-steady wind loading, this paper shows the importance of the non linearity of the wind loading. More particularly, it focuses of the influence, on the structural response, of the non linearity of the aerodynamic coefficients. It is shown that, in case of 2-D turbulent flow, the influence of this kind of non linearity may be significant. To do so, statistical characteristics of the loading as well as those of the response are computed in such a turbulent flow. [less ▲]

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See detailRole of histone deacetylases in myofibroblastic differenciation
Glénisson, Wendy; Waltregny, David ULg; Castronovo, Vincenzo ULg

Conference (2006)

Detailed reference viewed: 4 (0 ULg)
See detailThe lymphatic ring assay: a new in vitro model of lymphangiogenesis
Bruyère, F; Melen, L; Blacher, Silvia ULg et al

Conference (2006)

Detailed reference viewed: 10 (2 ULg)
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See detailEffects of MMP inhibition on emphysema development, Inflammation induced by cadmium in rats
Fievez, Laurence ULg; Kirschvinck, N.; Belleflamme, M. et al

in IUPHAR Congress, Pékin Japon, juillet 2006 (2006)

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See detailPractical use of dissipative connections in high rise frames with concentric bracings
Degée, Hervé ULg; Plumier, André ULg; Doneux, C. L.

in Proceedings of the ICMS Conference (2006)

A quantitative comparison of two 15 storey high framesdesigned to resist a 0.4g PGAhas been made: one frame corresponds to a standard design in which connections of diagonals are capacity designed to the ... [more ▼]

A quantitative comparison of two 15 storey high framesdesigned to resist a 0.4g PGAhas been made: one frame corresponds to a standard design in which connections of diagonals are capacity designed to the diagonal sections and the other one uses dissipative connections at the diagonals ends. The structures are designed by a standard elastic procedure under reduced forces. Pushover analysis and non linear dynamic analyses are then performed to assess the real behavior and performance of the structures. The advantages of using dissipative connections are confirmed in a high rise flexible building. [less ▲]

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See detailCoupled instabilities of steel box sections
Kuhlmann, U.; Detzel, A.; Degée, Hervé ULg

in Proceddings of the 6th European Solid Mechanics Conference ESMC 2006 (2006)

Thin walled columns are subject to stability failure on local (plate buckling) and global (column buckling) level. Both buckling phenomena interact. A proposal for the use of EBC for the determination of ... [more ▼]

Thin walled columns are subject to stability failure on local (plate buckling) and global (column buckling) level. Both buckling phenomena interact. A proposal for the use of EBC for the determination of the carrying capacity of welded steel box sections is given and compared to an extensive numerical simulation study. [less ▲]

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See detailStudy of thermal effects in bulk RE-BCO superconductors submitted to a variable magnetic field
Laurent, Philippe; Fagnard, Jean-François ULg; Mathieu, J.-P. et al

in Journal of Physics: Conference Series (2006), 43

When bulk RE-BCO superconductors are used as permanent magnets in engineering applications, they are likely to experience transient variations of the applied magnetic field. The resulting vortex motion ... [more ▼]

When bulk RE-BCO superconductors are used as permanent magnets in engineering applications, they are likely to experience transient variations of the applied magnetic field. The resulting vortex motion may cause a significant temperature increase. As a consequence the initial trapped flux is reduced. In the present work, we first focus on the cause of a temperature increase. The temperature distribution within a superconducting finite cylinder subjected to an alternating magnetic field is theoretically predicted. Results are compared to experimental data obtained by two temperature sensors attached to a bulk YBCO pellet. Second, we consider curative methods for reducing the effect of heat flux on the temperature increase. Hall-probe mappings on YBCO samples maintained out of the thermal equilibrium are performed for two different morphologies : a plain single domain and a single domain with a regularly spaced hole array. The drilled single-domain displays a trapped induction which is weakly affected by the local heating while displaying a high trapped field. [less ▲]

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See detailRange-dependence Issues in Multistatic STAP-based Radar
Neyt, Xavier; Acheroy, Marc; Verly, Jacques ULg

Conference (2006)

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See detailInteractions between numerical and physical modelling for the design and optimization of hydraulic structures - Example of a large hydroelectric complex
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Dewals, Benjamin ULg et al

in Proceedings of the International Symposium on Hydraulic Structures, XXII Congreso Latinoamericano de Hidráhulica (2006)

This paper describes the successful combination of both physical and numerical modelling techniques applied to the scale model study of a large hydroelectric complex in India. Thanks to accurate numerical ... [more ▼]

This paper describes the successful combination of both physical and numerical modelling techniques applied to the scale model study of a large hydroelectric complex in India. Thanks to accurate numerical simulations, the physical model layout and the time to studies have been drastically reduced. First, prior to the design of the scale model, a global numerical simulation of the dam reservoir has been carried out, on the basis of the entire set of available topographic data. The simulation results supply the flow conditions in the upstream reservoir, particularly in the vicinity of the dam and the spillway crest. Subsequently, a second numerical computation has been performed to simulate the flow in a scale model representing only a small part of the reservoir upstream of the dam. The suitable correspondence between flow conditions in both cases has been demonstrated. This two-steps approach has enabled a significant reduction in the size of the scale model, and hence, a lower cost as well as a shorter delay for building the model. Simultaneously, it has been possible to decrease the scale factor at constant cost. In conclusion, the present paper provides convincing evidence that the increase in computers performance and the efficiency of contemporary free-surface flow solvers lead to useful numerical information for the optimal design and exploitation of scale models. [less ▲]

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See detailRole of Sox 10 in the development of the inner ear
Bodson, M; Breuskin, I; Thelen, Nicolas ULg et al

Poster (2006)

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See detailAchromatic optical vortex coronagraph with subwavelength gratings
Mawet, Dimitri ULg; Riaud, Pierre ULg; Baudrand, J. et al

in Proceedings of the Coronagraph Workshop (2006)

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See detailEtude écopathologique des facteurs de risque des mammites dans les élevages laitiers en Wallonie
Delfosse, C.; Froidmont, E.; Curnel, Y. et al

Poster (2006)

La mammite a de multiples origines et est souvent de type subclinique, rendant contrôle et surveillance difficiles. La majorité des études relatives aux mammites se caractérise par une approche ... [more ▼]

La mammite a de multiples origines et est souvent de type subclinique, rendant contrôle et surveillance difficiles. La majorité des études relatives aux mammites se caractérise par une approche individuelle. Le cadre expérimental restreint de celles-ci ne permet pas une interprétation précise des observations, à la suite du nombre limité de facteurs étudiés. L’approche choisie pour cette étude se veut globale et implique un grand nombre d’exploitations. Elle a pour objectifs d’identifier et de hiérarchiser, au travers d’une enquête, les caractéristiques générales de traite et les conditions environnementales des élevages laitiers influençant le statut sanitaire du pis [less ▲]

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See detailIdentification of yield locus parameters of metals using inverse modeling and full field DIC
Lecompte, D.; Cooreman, S.; Sol, H. et al

in Proceedings of the 7th national congress on theoretical and applied mechanics (2006)

The basic principle of the inverse modeling procedure as it is used for parameter identification is the generation of a complex and heterogeneous deformation field that contains as much information as ... [more ▼]

The basic principle of the inverse modeling procedure as it is used for parameter identification is the generation of a complex and heterogeneous deformation field that contains as much information as possible about the parameters to be identified. One way of obtaining such a non-homogeneous deformation is by making the geometry of the specimen less regular. Another possibility is to make the loading conditions more complex. In this paper both options are actually combined by using the concept of a biaxial tensile test on a perforated cruciform specimen. In the present paper, the work hardening of the material is assumed to be isotropic and it is described by a Swift law. The yield locus is modeled by the anisotropic Hill48 criterion. The optimization technique used is a constrained gradient based Newton-type routine, which means that in every iteration step, a sensitivity calculation has to be performed in order to indicate the direction in which the parameters are to be optimized. The functional to be minimized is a least-squares expression of the discrepancy between the measured and the simulated strain fields at a certain load. The numerical routines as well as the identification results of the different parameters, based on simulated strain fields, are discussed. [less ▲]

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See detailWhat did we recently learned on and from equine Doppler echocardiography ?
Amory, Hélène ULg; Pirard, L; Sandersen, Charlotte ULg

in Proceedings of the Resident Meeting of the European College of Equine Internal medicine (ECEIM) (2006)

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See detailPituitary Diseases in Daily Clinical Pratice : Prevalence and Relevance 2006
Jaffrain-Réa, M. L.; Valle, L.; Daly, Adrian ULg et al

in Congrès Italien d'Endocrinologie : Florence, 2006 (2006)

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See detailRelationship between the progress of the foliar pathogens caused by Septoria tritici and the reduction of the photosynthetic vitality of plants in Grand-Duchy of Luxembourg in 2004.
El Jarroudi, Moussa ULg; Crumière, F.; Hausman, J.-F. et al

in Bibliotheca fragmenta agronomica - Book of proceedings (2006), 11(2), 643-644

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See detailInfluence of carbide precipitation on hot hardness of high speed steel rolls
Herman, M.; Breyer, J. P.; Lecomte-Beckers, Jacqueline ULg

in Proceedings of the Southern African Roll Users' Conference (SARUC) (2006)

This paper will illustrate the choice of the alloying elements and their content in the current grade. By using sophisticated laboratory examination techniques such as differential thermal analysis ... [more ▼]

This paper will illustrate the choice of the alloying elements and their content in the current grade. By using sophisticated laboratory examination techniques such as differential thermal analysis, scanning electron microscopy and image analysis, the metallurgical parameters of Aurora grade will be described and compared to those of the Kosmos grade. An attempt will also be made to connect all our laboratory results to the good behaviour of the alloy in operation in the early stands of Hot Strip Mills. [less ▲]

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See detailGrowth and carcass performances of Belgian Blue x Nelore and Bradford cattle in Bahia state Brazil
Leroy, Pascal ULg; Leroy, Emile ULg; Cassart, Renaud ULg

in World Congress on Genetics Applied to Livestock Production. Belo Horizonte, Brasil (2006)

Detailed reference viewed: 79 (8 ULg)
See detailCurrent generation arrays: current status, getting the most out of them and future development
Akeson, R.; ten Brummelaar, T.; Eisner, J. et al

in “Future Directions for Interferometry” (2006)

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See detailThe Future of Space-Based Interferometry
Carpenter, K. G.; Allen, R.; Benson, J. et al

in “Future Directions for Interferometry” (2006)

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See detailPlasma cystatin C for the detection of renal failure in obese patients
Delanaye, Pierre ULg; Cavalier, Etienne ULg; Radermecker, Régis ULg et al

in Nephrology Dialysis Transplantation (2006), 21(S4), 214

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See detailSimultaneous use of hydrogeological and geophysical data for groundwater protection zone delineation by co-conditional stochastic simulations
Rentier, Céline; Dassargues, Alain ULg

in Stauffer, Fritz; Dassargues, Alain (Eds.) Quantitative Geology from Multiple Sources: S10 Use of multiple sources in conditioning/calibrating groundwater flow and transport models (2006)

Delineation of protection zones is performed by the use of stochastic simulations integrating all available data. In practice, due to the few available measurements of the main parameters, it can be very ... [more ▼]

Delineation of protection zones is performed by the use of stochastic simulations integrating all available data. In practice, due to the few available measurements of the main parameters, it can be very useful to integrate other data to reduce the uncertainty of the results. Most of the solute spreading is governed by the hydraulic conductivity (K) spatial variability at different scales. A stochastic approach adding measured piezometric heads and electrical resistivity data is presented. Results are discussed on a synthetic and on a practical case. Delineating the ‘Capture zone Probability Distribution’ (CaPD) for a given time, it is shown how the uncertainty can be reduced. The methodology can be used in real applications when little or no information is available about the hydraulic properties, through the conditioning on other data sets. [less ▲]

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See detailInterim Report on clinical testing of a comprehensive solution for patient positioning and immobilization for high tech RT
Hideghéty, Katalin; Kahan, Zsuzsa; Thurzo, Laszlo et al

in Radiotherapy & Oncology (2006), 81(supplement 1), 434

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See detailLa vibrotonie corporelle totale : analyse critique et application sportive
Croisier, Jean-Louis ULg; Lehance, Cédric ULg; Jidovtseff, Boris ULg et al

in Abstract Book du Symposium « Actualités en électrothérapie » du CKULg (2006)

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See detailGraeco-Egyptian Alchemy in Byzantium
Mertens, Michèle ULg

in Magdalino, Paul; Mavroudi, Maria (Eds.) The Occult Sciences in Byzantium (2006)

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See detailFUNCTIONALITY OF SYNTHETIC POLYCATIONS FOR THE MASKING OF ANTIGENIC SITES BY MEANS OF OPTICAL METHODS
Relancio, MF; Riquelme, B; Dumas, D et al

in Proceeding of the 91st Annual Meeting of the Argentine Physics Association (2006)

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See detailThe effects of attentional level and test format on the resistance to false memories.
Dehon, Hedwige ULg; Lampinen, James Michael

Poster (2006)

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See detailDynamics of spontaneous ventricular fibrillation in acutely ischemic pigs
Desaive, Thomas ULg; Janssen, Nathalie ULg; Péters, F. et al

in Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology (2006), 8 (supplement 1)

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See detailProposition pour l'édition des sources primaires CCFM
Mazziotta, Nicolas ULg

Conference (2006)

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See detailHaubanage et gestion du risque
Campanella, Bruno ULg

Conference (2006)

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See detailHIV viraemic patients downregulate CD94/NKG2A inhibitory receptors on NK as well as CD8 T cells in comparison with aviraemic counterparts
Zeddou, Mustapha; Rahmouni, Souad ULg; VANDAMME, Arnaud ULg et al

Poster (2006)

Background: The CD94/NKG2 heterodimer is a C-type lectin receptor formed by the association of CD94 and one of the NKG2 molecules (namely NKG2A, -B, -C or –E). The interaction of CD94/NKG2A with non ... [more ▼]

Background: The CD94/NKG2 heterodimer is a C-type lectin receptor formed by the association of CD94 and one of the NKG2 molecules (namely NKG2A, -B, -C or –E). The interaction of CD94/NKG2A with non classical HLA-E molecules delivers inhibitory signals. CD94/NKG2A is normally expressed on most NK cells whereas less than 5% of peripheral resting CD8+ T cells are positive. Although several reports have clearly shown an upregulation of CD94 on CD8 T cells in HIV infection, the simultaneous expression of both subunits of the inhibitory receptor on NK and T cells and its relation with viral load is largely unknown. Methods: PBLs from 30 HIV-infected patients (16 viraemic and 14 aviraemic under HAART) and 18 healthy volunteers were analysed by flow cytometry after staining with the following monoclonal antibodies (Percp-conjugated anti-CD8, FITC-conjugated anti-CD3, APC-conjugated anti-CD94, PE-conjugated anti-NKG2A). Results: The proportion of CD8 T cells expressing the CD94/NKG2A inhibitory receptor was not significantly increased in HIV-infected patients (5.68 ± 3.72%) in comparison with non-infected controls (4.90±2.84%). Interestingly, patients with viral load < 50 copies/ml had a higher proportion of CD8 T cells expressing the inhibitory receptor (7.15 ± 3.63%) than patients with HIV viraemia (4.40 ± 3.40%), p= 0.041. The same pattern was observed for NK cells and was even more pronounced. In aviraemic individuals, 61.75 ± 20.39% of NK cells expressed the inhibitory receptor vs 42.88 ± 26.38% in viraemic patients. The proportion of CD94/NKG2A positive cells was correlated between NK and CD8 T cell subsets (p=0.0351) but there was no correlation with absolute or relative CD4 counts. Conclusions: Our results suggest that chronic stimulation with HIV antigens in viraemic patients could lead to decreased rather than increased expression of inhibitory receptors on NK and CD8 T cells. This could contribute to the abnormal activation of the immune system associated with advanced HIV disease. [less ▲]

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See detailMitochondrial UCPs: New insights into regulation and impact
Sluse, Francis ULg; Jarmuszkiewicz, Wieslawa; Navet, Rachel ULg et al

in Biochimica et Biophysica Acta-Bioenergetics (2006), 1757(5-6, Suppl 1), 101

Uncoupling proteins (UCPs) are mitochondrial inner membrane proteins sustaining an inducible proton conductance. They weaken the proton electrochemical gradient built up by the mitochondrial respiratory ... [more ▼]

Uncoupling proteins (UCPs) are mitochondrial inner membrane proteins sustaining an inducible proton conductance. They weaken the proton electrochemical gradient built up by the mitochondrial respiratory chain. Brown fat UCP1 sustains a free fatty acid (FA)-induced purine nucleotide (PN)-inhibited proton conductance. Inhibition of the proton conductance by PN has been considered as a diagnostic of UCP activity. However, conflicting results have been obtained in isolated mitochondria for UCP homologues (i.e., UCP2, UCP3, plant UCP, and protist UCP) where the FFA-activated proton conductance is poorly sensitive to PN under resting respiration conditions. Our recent work clearly indicates that the membranous coenzyme Q, through its redox state, represents a regulator of the inhibition by PN of FFA-activated UCP1 homologues under phosphorylating respiration conditions. Several physiological roles of UCPs have been suggested, including a control of the cellular energy balance as well as the preventive action against oxidative stress. In this paper, we discuss new information emerging from comparative proteomics about the impact of UCPs on mitochondrial physiology, when recombinant UCP1 is expressed in yeast and when UCP2 is over-expressed in hepatic mitochondria during steatosis [less ▲]

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See detailCaractéristiques de la gestion de crise au niveau international
Candela Soriano, Mercedes; Brunet, Sébastien ULg

in Rapports Belges au Congrès de l’Académie Internationale de Droit Comparé à Utrecht (2006)

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See detailLarge-scale groundwater flow and transport modelling : Methodology and application to the Geer basin, Belgium
Orban, Philippe ULg; Dassargues, Alain ULg; Brouyère, Serge ULg

in Stauffer, Fr.; Dassargues, Alain (Eds.) Quantitative Geology from Multiple Sources: S10 Use of multiple sources in conditioning/calibrating groundwater flow and transport models (2006)

Efficient and sustainable management of water resources should be considered from an integrated way, at the basin scale. For that purpose, physically-based, spatially distributed modelling tools has ... [more ▼]

Efficient and sustainable management of water resources should be considered from an integrated way, at the basin scale. For that purpose, physically-based, spatially distributed modelling tools has turned to be very useful. If regional groundwater flow model have been developed for years now, large scale contaminant transport models are still almost inexistent. The objective of this extended abstract is to present briefly new concepts for large transport modelling, more particularly a modelling approach, the Hybrid Finite Element Mixing Cell (HFEMC) developed by the Hydrogeology Group of the University of Liège 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 detailEffect of cross country on plasma levels of myeloperoxidase in saddle ponies
Art, Tatiana ULg; Franck, Thierry ULg; Gangl, M. et al

in Abstracts book of iceep (2006)

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See detailRegular events in travel behaviour research: setup of a longitudinal websurvey
Cools, Mario ULg; Moons, Elke; Wets, Geert

Conference (2006)

One of the leading paradigms in modern travel behaviour research is the activity based approach, which considers travel as a derivative from the activities that individuals and households need or wish to ... [more ▼]

One of the leading paradigms in modern travel behaviour research is the activity based approach, which considers travel as a derivative from the activities that individuals and households need or wish to perform. Longitudinal designs provide the required framework for a better understanding of the dynamics of travel behaviour. Longitudinal data can be used to analyze behavioural adjustments some time before (response leads) or after (response lags) the occurrence of an event, or for instance to analyze routine behaviour. The questionnaire used to collect the data will be an activity diary. The respondents are asked to fill in all their activities performed that day. The diaries have to be filled in at least twice a week. These moments are randomly selected, but in weeks when a special event occurs, the days around this special event are questioned as well. Performing a longitudinal study has certain drawbacks however. The respondent burden can cause different side-effects, such as panel attrition, decreasing representativeness and, reporting errors. Thus, next to refreshing the sample regularly, trying to keep the respondents motivated is essential. A first step in lowering the respondent burden is to make the activity diaries user-friendly. An internetbased questionnaire makes interaction with respondents possible. The respondent’s current results can be graphically displayed (e.g. geographical map of activity-pattern), potentially awakening or strengthening the interest in the study. Logical rules (e.g. two activities on two different locations require a trip in between) can be formulated, and the interaction with the respondents allows the researcher to get feedback on “strange” answers, or on missing values, thus improving the data quality. This paper describes some potential paths to minimise sample attrition (e.g. internet-based interaction with respondents) and ways to refresh the sample. These findings are applied to the study of travel behaviour of Flemish households around school holidays. [less ▲]

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See detailThe role of sleep in the consolidation of emotional memories in humans : a fMRI study
Sterpenich, Virginie; Albouy, Geneviève ULg; Boly, Mélanie ULg et al

Poster (2006)

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See detailStudy of the combined effects of temperature, pH and Aw on the growth rate of Trichoderma asperellum using a response surface methodology
Begoude, B. A. D.; Lahlali, R.; Friel, D. et al

Poster (2006)

Detailed reference viewed: 18 (1 ULg)
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See detailCardiac pumping reserve measured in healthy horses using a dobutamine stress test
Sandersen, Charlotte ULg; Detilleux, Johann ULg; Art, Tatiana ULg et al

in Proceedings of the 45th Congress of the British Equine Veterinary Association (2006)

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See detailUtilisation des microscories métallurgiques comme traceur de la sédimentation dans les plaines alluviales ardennaises
Houbrechts, Geoffrey ULg; Petit, François ULg

in l'érosion entre société, climat et paléoenvironnement (2006)

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See detailTranscriptional regulation of the mouse doublecortin gene in differentiating neurons
Plumier, Jean-Christophe ULg; Muller, Marc ULg; Rogister, Bernard ULg et al

in International Journal of Developmental Neuroscience (2006), 24

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See detailLes nouvelles orientations de l’enseignement de l’histoire à l’école secondaire en Communauté française de Belgique
Jadoulle, Jean-Louis ULg

in B. CAULIER & L. COURTOIS (Ed.) Québec-Wallonie. Dynamique des espaces et expériences francophones (2006)

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See detailStructural and electrical properties of tellurovanadate glasses containing Li2O
Krins, Natacha ULg; Vertruyen, Bénédicte ULg; Lepot, Laurent et al

Conference (2006)

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See detailStress constrained optimization using X-FEM and Level-Set description
Van Miegroet, Laurent ULg; Jacobs, Thibault; Lemaire, Etienne ULg et al

in Proceedings of III European Conference on Computational Mechanics. Solids, Structures and Coupled Problems in Engineering (2006)

This paper presents and describes an intermediate approach which takes its place between the two classical methods of shape and topology optimization. It is based on using the recent Level Set description ... [more ▼]

This paper presents and describes an intermediate approach which takes its place between the two classical methods of shape and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended Finite Element Method (X-FEM). The method benefits from the fixed mesh work using X-FEM and from the curves smoothness of the Level Set description. Design variables are shape parameters of basic geometric features. The number of design variables of this formulation remains small whereas various global and local constraints can be considered. A key problem which is investigated here is the sensitivity analysis and the way it can be carried out precisely and efficiently. Numerical applications revisit some classical 2D (academic) benchmarks from shape optimization and illustrate the great interest of using X-FEM and Level Set description together. The paper presents the results of stress constrained problems using the proposed X-FEM and Level Set based formulation. A central issue is the sensitivity analysis (related to the compliance and/or the stresses) and the way it can be carried out efficiently. A special attention is also paid to stress constrained problems which are often neglected in other Level Set Methods works. [less ▲]

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See detailAnalyse qualitative de la problématique de l’abandon de la natation de compétition en Communauté française de Belgique
Lefefvre, Fabien; Habsch, Ingrid; Cloes, Marc ULg

in Carlier, Ghislain; Bouthier, Daniel; Bui-Xuän, G. (Eds.) Intervenir en éducation physique et en sport. Recherches actuelles (2006)

Dans cette étude, nous aborderons le phénomène de l’abandon de la pratique compétitive de la natation en privilégiant une approche qualitative, contrairement à ce qui a déjà été proposé dans la ... [more ▼]

Dans cette étude, nous aborderons le phénomène de l’abandon de la pratique compétitive de la natation en privilégiant une approche qualitative, contrairement à ce qui a déjà été proposé dans la littérature. En récoltant des données chez les différents acteurs de clubs, nous ambitionnons de mieux cerner le phénomène et, surtout, de croiser les données issues des pratiquants avec celles des autres personnages clés de la réussite sportive. Mettre en exergue les solutions imaginées par les dirigeants sportifs pour lutter contre ce phénomène et offrir une base de réflexion et d’action aux praticiens constituent les finalités pratiques de cette étude. [less ▲]

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See detailÉtiquettes de médicaments, listes de drogues, prescriptions et réceptaires dans l'Égypte gréco-romaine et byzantine
Marganne, Marie-Hélène ULg

in Collard, Franck; Samana, Evelyne (Eds.) Pharmacopoles et apothicaires. Les "pharmaciens" de l'Antiquité au Grand Siècle (2006)

Survey of the greek papyri with drugs'names, lists of drugs, prescriptions and receptaries in Graeco-Roman and Byzantine Egypt

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See detailLa sélection des antagonistes de Penicillium expansum et Botrytis cinerea, deux parasites de post-récolte des pommes
Achbani, E. H.; Mounir, R.; El Jaafari, S. et al

Poster (2006)

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See detailCharacterization at nanometric scale of the interaction between fluoroquinolones (ciprofloxacin) and membrane lipids
Bensikaddour, Helmet; Fa, Nathalie; Deleu, Magali ULg et al

Poster (2006)

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See detailAdvantages of using dissipative connections in the diagonals of high rise concentric braced frames
Doneux, C. L.; Plumier, André ULg; Degée, Hervé ULg

in Mazzolani; Wada (Eds.) Proceedings of the STESSA Conference (2006)

The paper presents a quantitative comparison of two seismic design of a concentric braced frame of 15 storey height for a 0.4 g PGA: one classical design in which connections of diagonals are capacity ... [more ▼]

The paper presents a quantitative comparison of two seismic design of a concentric braced frame of 15 storey height for a 0.4 g PGA: one classical design in which connections of diagonals are capacity designed to the diagonal sections and one innovative design introducing dissipative connections at the ends of the diagonals. The structures are first designed by equivalent static design. Pushover analysis and non linear dynamic analyses are then performed to compare the real behavior and performance of the structures. The advantages of using dissipative connections are confirmed in a high rise flexible building. [less ▲]

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See detailThe processes of going into fatherhood: a clinical approach.
Naziri, Despina ULg; De Coster, L.

Poster (2006)

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See detailL’injustice de la responsabilisation
Andre, Géraldine ULg

Conference (2006)

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See detailSimple heuristic model of an aerosol filter
Lecocq, Rapahaël; Calvo, Sébastien ULg; Saroha, Anil et al

Poster (2006)

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See detailIron(III) species dispersed in porous silica through sol-gel chemistry: nature, size, and catalytic activity
Heinrichs, Benoît ULg; Rebbouh, Leila; Geus, John W. et al

Conference (2006)

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See detailNeoadjuvant Radiochemotherapy of Locally/Regionally Advanced Rectal Cancer is a standard treatment option
Farkas, Róbert; Al-Farhat, Yousuf; GULYBAN, Akos ULg et al

in Radiotherapy & Oncology (2006), 81(suppl1), 237

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See detailCharacterisation of fissured aquifers in the semi-arid region of the mid-Atlas plateau (Oulmès, Morocco)
Orban, Philippe ULg; Ruthy, Ingrid ULg; Elbatloussi, D. et al

in GIRE3D: International Congress on Integrated Water Resources management and Challenges of the Sustainable Development (2006)

The Oulmès plateau (mid-Atlas in Morocco) is known for its groundwater resources in this semi-arid region. In the studied zone (approximately 80 km2), the mineral water of ‘Sidi Ali’ is exploited as well ... [more ▼]

The Oulmès plateau (mid-Atlas in Morocco) is known for its groundwater resources in this semi-arid region. In the studied zone (approximately 80 km2), the mineral water of ‘Sidi Ali’ is exploited as well as the naturally semi-sparkling ‘mineral water of Oulmès’ which are main mineral waters marketed in Morocco. Their sources are located at less than four kilometers from each other. In the same time, the drinking water supply to the local rural populations is far from being sufficient, and even in some places non-existent. In addition the plateau is also the place where many fruit-bearing cultures have been undertaken for a few years. Irrigation and the use of pesticide and herbicide compounds as well as fertilizers could constitute threats for the groundwater quantity and quality and unpleasant consequences are expected for all dependent groundwater end-users. Thus, in this semi-arid zone, an acute problem of sustainable development arises in terms of groundwater quantity and quality. An extended study has involved data collection, measurement campaigns (piezometric levels, sampling & analysis of groundwater), shallow geophysical prospecting, pumping tests, building of a data base, estimation of the recharge spatial distribution and hydrogeological mapping. On the basis of this study, a better understanding is possible about the state and the particular hydrodynamic behaviour of groundwater in the fissured hard-rocks of this plateau. Results are expressed in maps providing explicit and useful information allowing future decisions which can be taken for the welfare of everyone and particularly for the local populations. [less ▲]

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See detailSTRATEGY FOR THE QUALITATIVE AND QUANTITATIVE ANALYSIS OF CROP SYRUP CONTAINING ISOMALTOOLIGOSACCHARIDES KNOWN AS EMERGING PREBIOTICS
Goffin, Dorothée ULg

Conference (2006)

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human ... [more ▼]

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human subjects, support the involvement of dietary oligosaccharides in physiological processes in the different intestinal cell type and also outside the gastrointestinal tract (e.g. hormone production, lipid and carbohydrate metabolism). IMOs consists of glucose monomers linked by at least one α-1-6, or in a lower proportion α -1-3 (nigerose family) or α -1-2 (kojibiose family) glucosidic linkages. In our case they are produced enzymatically from corn starch. It results in a very complex mixture with molecules characterized at the same time by their DP value (from 2 to ~20), linkages types (α-1-2, 3 or 6) and the proportion and position of each type of linkage (only α -1-6 or combined types). The challenge of this study was to find a qualitative and quantitative method to characterize the syrups. In a subsequent study, every unidentified peak could be determined by NMR or Mass spectrometry. Three different chromatographic methods have been tested and compared over their selectivity, sensibility, robustness, applicability and their quantitative power. The HPLC-RID (Refractive Index Detector) used with a Prevail Carbohydrate column (Alltech), adapted for carbohydrates with a certain value of DP, appear to be poorly selective due to the obligation of working in isocratic conditions. The HPLC-ELSD (Evaporating Light Scattering Detector) used with the same column gave a very good separation upon the DP as the Prevail accepts a wide range of solvant changing and even a separation of the different DP 2 molecules. The sensibility was also improved due to the stability of the baseline. The quantitative analysis is a bit more awkward due to the relatively limited linear portion of the calibration curve. High-performance Anion Exchange Chromatography coupled with Pulsed Amperometric Detection (HPAEC-PAD) appeared to deserve a special mention, since it provides selective separation and sensitive detection. In fact, this technique is the only chromatographic one to separate with effectiveness homologue molecules having a difference only in their DP (up to high DPs) or linkage types. This is due to the separation mode based on the difference in ionic force of the sugars in alkaline conditions (mainly due to the DP and the structure of the molecule). However, during the detection, the electrochemical behavior of carbohydrates can be affected by molecular weight as well as by structural differences giving rise to different response factors; as a consequence, HPAEC-PAD is not generally considered as suitable for quantitative studies of complex mixtures of oligosaccharides. In this work a methodological approach is presented in order to get a quantitative response through a rigorous methodology for our IMOs. It also opens the way to the theoretical determination of the response factor for the homologue molecules in relation with their structure and DP. [less ▲]

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See detailKnowledge-aided heterogeneity-compensation algorithm for STAP applicable to bistatic configurations and conformal antenna arrays
Ries, Philippe; De Grève, Sébastien; Lapierre, Fabian D. et al

Conference (2006)

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See detailPost-invasion evolution of an invasive plant : altitudinal differenciation in germination and growth
Monty, Arnaud ULg; Mahy, Grégory ULg

Conference (2006)

Senecio inaequidens DC. was introduced from South Africa to Europe more than one hundred years ago, in a few precise locations linked to wool industry and extended its distribution throughout Europe. In a ... [more ▼]

Senecio inaequidens DC. was introduced from South Africa to Europe more than one hundred years ago, in a few precise locations linked to wool industry and extended its distribution throughout Europe. In a context of global warming, the potential evolution in germination and growth during the invasion process was studied in relation to altitude and climate. Seeds were collected along two transects (both altitudinal and climatic) in Belgium and France, going from the sea level to high altitudes (respectively 485 m and 1700 m) through the introduction spots. Respectively four and five climatic zones per transect, two populations per zone and ten randomly selected individuals per population were sampled. Seeds were sorted in order to discard maternal effects. Ten seeds per parent individual were thereafter sown in pots in a common garden experiment in Gembloux (Belgium). Germination was checked every two days. Height and diameter of plants, enabling the calculation of plant volume, were measured every 25 days. Despite an important variability, linear regression of first germination time (since sowing) vs altitude was significant (p = 0.001) for the French gradient, but not for the Belgian one. No significant difference was found in germination rate between climatic zones. For each of the three measurement times of plant height and diameter, regression of plant volume vs altitude was also significant for the French transect (p varying from 0.025 to 0.000 according to time), but not for the Belgian one. French plants from elevated locations germinated later and grow slowlier. These preliminary results suggest that contrasted climatic conditions in the French gradient, going from the Mediterranean coast to the Pyrrenean high elevations led to genetic differenciation of Senecio populations during its invasion in southern France. Less contrasted climatic conditions, together with a supposed loss of genetic variability (Lafuma 2003), did not lead to a clear differenciation in Belgium. References : Lafuma, L. (2003). L'invasion de Senecio inaequidens (Asteraceae) en Europe: une approche évolutive. PhD thesis, Montpellier University. [less ▲]

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See detailBiosignatures morphologiques: quelques pistes de réflexion
Javaux, Emmanuelle ULg

Conference (2006)

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See detailThe power of hybrid acceleration
Boigelot, Bernard ULg; Herbreteau, Frédéric

in Lecture Notes in Computer Science (2006), 4144

This paper addresses the problem of computing symbolically the set of reachable configurations of a linear hybrid automaton. A solution proposed in earlier work consists in exploring the reachable ... [more ▼]

This paper addresses the problem of computing symbolically the set of reachable configurations of a linear hybrid automaton. A solution proposed in earlier work consists in exploring the reachable configurations using an acceleration operator for computing the iterated effect of selected control cycles. Unfortunately, this method imposes a periodicity requirement on the data transformations labeling these cycles, that is not always satisfied in practice. This happens in particular with the important subclass of timed automata, even though it is known that the paths of such automata have a periodic behavior. The goal of this paper is to broaden substantially the applicability of hybrid acceleration. This is done by introducing powerful reduction rules, aimed at translating hybrid data transformations into equivalent ones that satisfy the periodicity criterion. In particular, we show that these rules always succeed in the case of timed automata. This makes it possible to compute an exact symbolic representation of the set of reachable configurations of a linear hybrid automaton, with a guarantee of termination over the subclass of timed automata. Compared to other known solutions to this problem, our method is simpler, and applicable to a much larger class of systems. [less ▲]

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See detailTropical insects in collection at the University of Liège Museum of Zoology: a first approach
Loneux, Michèle ULg; Grogna, Philippe; Govers, Aurélie et al

in Segers, Hendrik; Desmet, P.; Baus, Erika (Eds.) Proceedings of the 3rd GBIF Science Symposium - Tropical Biodiversity: Science, Data, Conservation (2006)

The University of Liège Museum of Zoology holds some large and not well-known insect collections, which are still very well preserved, due to the work of famous entomologists and curators such as Fritz ... [more ▼]

The University of Liège Museum of Zoology holds some large and not well-known insect collections, which are still very well preserved, due to the work of famous entomologists and curators such as Fritz Carpentier and Noël Magis. Insects from tropical areas are very well presented in these collections and were collected all around the world. The expedition of Edouard van Beneden in Brazil (in company of two entomologists) provided numerous specimens, mainly Coleoptera. More than 8,500 insects were sent from Paraguay by the Estacion Entomologica ‘FABRE’ and are still preserved in the original mailing boxes. Due to investment of the University in cooperation projects with some African countries, numerous insects (mainly Lepidoptera and Coleoptera) were collected there between 1900 and 1990. The main source of exotic insect specimens is the “Léon Candèze’s collection of Lepidoptera from around the world”, which comprimes more than 9,500 specimens. A first inventory, which digitized all genera and families present in this collection, showed it contains at least five systematic types. However, the aforesaid collections need an in depth study from researchers interested in the genera and species they concern. Even though not every insect specimen is recorded in the handwritten registers or the collection database, the well- organised depositories allow finding them easy, and any request of study would be welcome. [less ▲]

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See detailFigurines en argent du limes danubien à l’effigie d’Isis et d’Harpocrate
Veymiers, Richard ULg; Bricault, Laurent

in Györy, Hedvig (Ed.) Aegyptus et Pannonia III. Acta Symposii anno 2004. In Memoriam László Kákosy (2006)

La présence isiaque le long du limes danubien est attestée par de très nombreux documents, de toutes natures. En Pannonie, outre Scarbantia et Savaria, dont les Iséums sont désormais bien connus ... [more ▼]

La présence isiaque le long du limes danubien est attestée par de très nombreux documents, de toutes natures. En Pannonie, outre Scarbantia et Savaria, dont les Iséums sont désormais bien connus, Carnuntum est un autre centre important de la diffusion isiaque, stimulée notamment par les visites de Caracalla dans ces régions. Plusieurs études ont déjà montré que certains ateliers locaux étaient à l’origine de nombreux isiaca (statuettes, gemmes) découverts le long du Danube. Une série très intéressante et fort originale de petites figurines en argent, à l’image d’Isis et d’Harpocrate, dont la provenance est probablement pannonienne, a pu être réunie. Son étude invite à y voir là encore une production locale, signe indiscutable de la vivacité de la présence des cultes isiaques en Pannonie aux IIe-IIIe s. apr. J.-C. [less ▲]

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See detailMulti-view object tracking using sequential belief propagation
Du, Wei ULg; Piater, Justus ULg

in Computer Vision – ACCV 2006 (2006)

Multiple cameras and collaboration between them make possible the integration of information available from multiple views and reduce the uncertainty due to occlusions. This paper presents a novel method ... [more ▼]

Multiple cameras and collaboration between them make possible the integration of information available from multiple views and reduce the uncertainty due to occlusions. This paper presents a novel method for integrating and tracking multi-view observations using bidirectional belief propagation. The method is based on a fully connected graphical model where target states at different views are represented as different but correlated random variables, and image observations at a given view are only associated with the target states at the same view. The tracking processes at different views collaborate with each other by exchanging information using a message passing scheme, which largely avoids propagating wrong information. An efficient sequential belief propagation algorithm is adopted to perform the collaboration and to infer the multi-view target states. We demonstrate the effectiveness of our method on video-surveillance sequences. [less ▲]

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