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See detailVers une réforme du Fonds des communes en Région wallonne
Husson, Jean-François ULg

in Courrier Hebdomadaire du CRISP (2004), (1849-1850), 5-74

This paper analyses the whole debate on the reform of the general grant mechanism ("Fonds des Communes") aimed at walloon municipalities. Developments in other Belgian Regions are also considered.

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See detailDynamic And Equilibrium Surface Tensions Of Surfactin Aqueous Solutions
Razafindralambo, Hary ULg; Thonart, Philippe ULg; Paquot, Michel ULg

in Journal of Surfactants and Detergents (2004), 7(1), 41-46

A homologous series of surfactins containing β-hydroxy fatty acids having 13, 14, or 15 carbon atoms were isolated from the supernatant of Bacillus subtilis strain S499 cultures. Their surface-active ... [more ▼]

A homologous series of surfactins containing β-hydroxy fatty acids having 13, 14, or 15 carbon atoms were isolated from the supernatant of Bacillus subtilis strain S499 cultures. Their surface-active properties at the air-water interface were then evaluated. Dynamic surface tension data were analyzed by the relaxation function γt=γm+(γo−γm)/[1+(t/t*)n]. Based on various parameters t*, n, vmax, γm calculated from this equation, the dynamic surface properties of surfactin were found to depend on both bulk concentration and hydrophobic character of the alkyl chain. At low concentrations of surfactin, the dynamic surface tension (γd) decreased with increasing carbon atom number of the surfactin alkyl chain (n=13 to 15). However, at high concentrations, the maximum decrease of 41-4 was achieved by surfactin-C14. In contrast, more strongly hydrophobic alkyl chains in surfactins always enhanced their ability in reducing the equilibrium surface tensions and their aptitude in forming micelles. [less ▲]

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See detailImpacts des aménagements de porcheries sur les émissions d'ammoniac et de gaz à effet de serre
Nicks, Baudouin ULg

in Proceedings de la quatrième journée Productions porcines et avicoles (2004)

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See detailHydro-mechanical numerical modelling of geotechnical problems using local second gradient models
Chambon, René; Collin, Frédéric ULg

in Vermeer, Peter; Ehlers, W.; Herrmann, H. J. (Eds.) Modelling of cohesive-Frictional Materials (2004)

The paper presents some applications of a local second gradient theory used to describe the mechanical behavior of a continua. This theory has been developed in order to avoid some well known drawbacks of ... [more ▼]

The paper presents some applications of a local second gradient theory used to describe the mechanical behavior of a continua. This theory has been developed in order to avoid some well known drawbacks of classical theories, when softening and/or localization occur in a computation. This theory is extended and then applied in a hydromechanical coupled problem, in the case of fully saturated geomaterials. The corresponding finite element method taking into account the geometrical non linearities is detailed. Preliminary results using the finite element code developed in this context are then discussed and allow to study post localization behavior. [less ▲]

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See detailGround-based FTIR measurements of O3- and climate-related gases in the free troposphere and lower stratosphere
De Mazière, M.; Barret, B.; Vigouroux, C. et al

in Zerefos, C. S. (Ed.) Proceedings Quadrennial Ozone Symposium (2004)

In the frame of the EC project UFTIR (Time series of Upper Free Troposphere observations from a European ground-based FTIR network), a common strategy for an optimal determination of the chemical ... [more ▼]

In the frame of the EC project UFTIR (Time series of Upper Free Troposphere observations from a European ground-based FTIR network), a common strategy for an optimal determination of the chemical composition in the free troposphere and lower stratosphere with ground-based Fourier-transform infrared (FTIR) spectrometers is being developed. The project focuses on 6 target species that are O3, CO, CH4, N2O, C2H6 and CHClF2 (HCFC-22). The strategy consists in selecting the most appropriate parameters to retrieve vertical concentration profiles from solar FTIR spectra. Among the important parameters are the spectral microwindows: they have been optimised to maximise the information content and to minimize the influence of poorly known spectroscopic data and interfering species. [less ▲]

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See detailDermatophytoses - Mise au point
Mignon, Bernard ULg

Conference given outside the academic context (2004)

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See detailEstimation de la fonction rénale chez le patient anorexique
Delanaye, Pierre ULg; Radermecker, Régis ULg; Saint-Remy, Annie ULg et al

in Diabètes & Métabolism (2004), 30

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See detailInteractions between vegetation and rock chemical weathering: A study with a coupled hydrological and biogeochemical model
François, Louis ULg; Bureau, M.; Carignan, J. et al

in Geochimica et Cosmochimica Acta (2004), 68(11), 437-437

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See detailVariability of the gas transfer velocity of CO2 in a macrotidal estuary (The Scheldt)
Borges, Alberto ULg; Vandenborght, Jean-Pierre; Schiettecatte, Laure-Sophie et al

in Estuaries (2004), 27(4), 593-603

We report a large set of 295 interfacial carbon dioxide (CO2) flux measurements obtained in the Scheldt estuary in November 2002 and April 2003, using the floating chamber method. From concomitant ... [more ▼]

We report a large set of 295 interfacial carbon dioxide (CO2) flux measurements obtained in the Scheldt estuary in November 2002 and April 2003, using the floating chamber method. From concomitant measurements of the air-water CO2 gradient, we computed the gas transfer velocity of CO2. The gas transfer velocity is well correlated to wind speed and a simple linear regression function gives the most consistent fit to the data. Based on water current measurements, we estimated the contribution of water current induced turbulence to the gas transfer velocity, using the conceptual relationship of O’Connor and Dobbins (1958). This allowed us to construct an empirical relationship to compute the gas transfer velocity of CO2 that accounts for the contribution of wind and water current. Based on this relationship, the spatial and temporal variability of the gas transfer velocity in the Scheldt estuary was investigated.Water currents contribute significantly to the gas transfer velocity, but the spatial and temporal variability (from daily to seasonal scales) is mainly related to wind speed variability. [less ▲]

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See detailLa capacité. Notions générales.
Leleu, Yves-Henri ULg

Book published by Larcier (2004)

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See detailA dynamic neighbourhood discovery protocol for active overlay networks
Martin, Sylvain ULg; Leduc, Guy ULg

in Lecture Notes in Computer Science (2004), 2982

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on ... [more ▼]

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on the IP routing table content augmented with traffic-based and dynamic refreshing techniques that allows it to react to virtual topology changes (nodes joining/leaving the overlay) as well as IP topology changes (broken and repaired link, route changes and moving nodes). This paper presents how the protocol detects overlay candidate nodes using probing capsules and the algorithms needed to select neighbours among the candidates. We also show how d-RADAR keeps the neighbouring table up to date and learns topology changes while keeping a low discovery and refresh overhead. A short summary of simulations carried out with our active network simulator illustrates how these algorithms actually behave. [less ▲]

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See detailObject tracking using a combined appearance and geometric model
Gabriel, Pierre F.; Piater, Justus ULg; Verly, Jacques ULg

Conference (2004)

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See detailMagnetic susceptibility applied as an age-depth-climate relative dating technique using sediments from Scladina Cave, a Late Pleistocene cave site in Belgium
Ellwood, B. B.; Harrold, F. B.; Benoist, S. L. et al

in Journal of Archaeological Science (2004), 31(3), 283-293

Here we demonstrate that magnetic susceptibility (MS) data from Scladina Cave, Belgium, provide a time-depth-climate relationship that is correlated to the marine oxygen isotopic record and thus yields a ... [more ▼]

Here we demonstrate that magnetic susceptibility (MS) data from Scladina Cave, Belgium, provide a time-depth-climate relationship that is correlated to the marine oxygen isotopic record and thus yields a high-resolution relative dating method for sediments recovered from many archaeological sites. This methodology will help resolve one of the major problems facing archaeologists, namely the difficulty of acquiring absolute dates with reasonable precision for the period from 40,000 to 400,000 years or so. The problem is that dating techniques applicable to most materials within this age range are subject to significant errors. Relative dating techniques.. such as magnetic secular variation or stable isotope methods, offer the potential to improve this precision. but both methods suffer from problems that make broad application to many sites impossible. However, for most archaeoloaical cave sites, MS measurements of cave sediments offers the potential for intra-site correlation and paleoclimate estimation. This is possible in protected cave environments because the MS of cave sediments results from climate processes active outside caves. which cause variations in magnetic properties of the sediments that ultimately accumulate inside caves. Once deposited, these materials are often preserved and their stratigraphy provides a time-depth-climate signal that can be identified. Therefore MS data can be used as an independent methodology, alongside conventional methods such as sedimentology and palynology, for relative age dates, and correlation within and between sites by tracing evidence of paleoclimatic change. This correlation has been used to infer an age of 90,000 +/- 7000 years for Neanderthal skeletal remains recovered from Scladina Cave, an important Middle Paleolithic archaeological site in Belgium. (C) 2003 Elsevier Ltd. All rights reserved. [less ▲]

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See detail"L'Egypte gréco-romaine révélée par les papyrus" : L'esclave (Recueil de documents papyrologiques)
Straus, Jean ULg

Book published by Université de Liège. Sciences de l'Antiquité. Langues et littératures classiques (2004)

A selection of 12 papyrological documents relative to slavery in Graeco-Roman Egypt (text, critical apparatus, translation, bibliography).

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