References of "Scientific congresses and symposiums"
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See detailPhysical processes study in the transition zone of the Northwest African upwelling: climatological data analysis
Elmoussaoui, Abdellali; Djenidi, Salim ULg; Kostianoy, Andrey

(2003)

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See detailGENIE: a ground-based precursor for the IRSI-Darwin mission
Absil, Olivier ULg

in Aime, Claude; Soummer, Rémi (Eds.) Astronomy with High Contrast Imaging (2003)

During the preliminary phase A of the Ground-based European Nulling Interferometer Experiment (GENIE), a number of interferometric configurations have been studied, in the cases of exozodiacal cloud and ... [more ▼]

During the preliminary phase A of the Ground-based European Nulling Interferometer Experiment (GENIE), a number of interferometric configurations have been studied, in the cases of exozodiacal cloud and hot Jupiter detection. Their expected performances have been computed in light of the measured or expected performances of the VLTI sub-systems. A simple Bracewell nulling interferometer, formed of two Unit Telescopes and working in the L' or N bands, has been identified as a good candidate configuration for exozodiacal cloud detection. External or internal chopping, fringe tracking and intensity matching will be critical issues for this configuration. In the case of hot Jupiter detection, a double Bracewell with internal modulation in the L' band seems well appropriate, and should allow to carry out low resolution spectroscopy on a few bright exoplanets. The basic assumptions and computations which have lead to these candidate configurations are described in this paper. [less ▲]

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See detailNumerical mdeling of hydro-mechanical fracture behaviour
Guiducci, Chiara; Collin, Frédéric ULg; Radu, Jean-Pol ULg et al

Conference (2003)

A numerical approach for modeling coupled Hydro-Mechanical fracture behavior in 2D is presented in this paper. This approach accounts for the strong dependence of the flow characteristics on fracture ... [more ▼]

A numerical approach for modeling coupled Hydro-Mechanical fracture behavior in 2D is presented in this paper. This approach accounts for the strong dependence of the flow characteristics on fracture apertures and offers an anisotropic description of the flow propagation in the fracture. An interface finite element and a constitutive model are developed . In order to validate the applicability of the model to general geomechanic problems, 2D simulations were performed. Results show the good application of the mathematical model and the fundamental hydraulic role played by the fractures. [less ▲]

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See detailIdentification of elastoplastic model parameters in large deformation problems using gamma methods
Jeunechamps, Pierre-Paul ULg; Walmag, J.; Mathonet, V. et al

in Proceedings of the 5th World Congress on Structural and Multidisciplinary Optimization (2003)

This paper reports on preliminary results of parameter identification problems in finite element non-linear analyses such as metal forming simulations. Two approaches are compared. The first one is the ... [more ▼]

This paper reports on preliminary results of parameter identification problems in finite element non-linear analyses such as metal forming simulations. Two approaches are compared. The first one is the classic Levenberg-Marquardt algorithm. The second one is a trust-region algorithm based on a quadratic model. The two algorithms are compared on two cases, one of them being an actuel experiment. [less ▲]

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See detailWalking for pleasure in Belgium
Hanocq, Philippe ULg

in Busi, Roberto; Pezzagno, Michèle (Eds.) Living and walking in cities 8th International conference (2003)

Description of an original and ambitious project of the regional Walloon government (Belgium) intending for the promotion of not motorised travelling modes : the “RAVeL project”.

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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 detailKarsts en roches cristallines silicatées non carbonatées.. Cas dans les métagabbros : grotte de Guessédoundou, Niger occidental
Willems, Luc ULg; Pouclet, André; Vicat, Jean-Paul

in Rodet, Joël (Ed.) Actes des Journées Européennes de l'AFK 2003 (2003)

Since the Seventies, a séries of phenomena developed in non carbonated silicated rocks question the traditional vision of karst. The term of karst is used in the meaning of "any feature of the classical ... [more ▼]

Since the Seventies, a séries of phenomena developed in non carbonated silicated rocks question the traditional vision of karst. The term of karst is used in the meaning of "any feature of the classical karst morphology (caves, sink-holes, lapiaz...) where dissolution plays the main genetic action and this in any kind of rocks". The cave of Guéssédoundou illustrâtes a karst in métagabbros. It opens at the top of a small hill, in a dépression twenty meters long and three to four meters deep. The walls of this dépression are subvertical and the bottom is partially occupied by angular pluridecimetric blocks. The cave is opened on several meters in the southern side of the dépression and is prolonged in the form of too narrow conduits to be explore. The bedrock is a metagabbro with fine grains, slightly weathered, crossed by decimetric quartzose veins. Gabbroïc texture is preserved, as well as part of magmatic plagioclases. The remainder is transformed into a mixture of white feldspar and clinozoisite. Pyroxene are pseudomorphosed in actinote and chlorite. The site dépression was created along a N 10° shear zone where rocks suffered important fracturation and fluid transfers, as shown by its silification and ferruginisation.. Moreover, a East-West schistosity, former to shearing, structures the gabbro. The présence of angular blocks of variable size and the absence of human activity trace on the site show that the dépression was formed naturally by collapse of the roof of a more vast cavity whose current cave would be the visible residual prolongation. The absence of flow traces and mechanical abrasion means that this cavity is due only to chemical érosion . At the cave entry and on the subvertical walls of the dépression were formed by alveoli a few centimètres to a few décimètres in diameter. Thèse alveoli of wall are known in other lithologies, in particular in limestones. The absence of salts within the rock draws aside a formation by sait weathering. The smooth aspect and non fractured walls of the cells cannot resuit from a corrosion to a fracturing node. The closed aspect of the dépression and the absence of flow trace eliminate the assumptions from formation by water swirls or eolisation. The genesis of the cave must be earlier to the installation of a weathering cover since the rock is little deteriorated and the alveoli are not developed on a quite particular level which would correspond to a précise pedogenic horizon. Only a generalized dissolution of the métagabbros, in relation to a slow solution circulation, being carried out with the favour of the fracturing plans of the shearing zone makes it possible to explain the formation of the alveoli. The inversion of relief results from a weaker érosion of the rocks made more résistant to this place by the quartz seam mainstay and by the ferruginisation along the shearing zone. In the other hand, the crushed rocks, become porous, drained the infiltrations of meteoric water, facilitating the dissolution processes. The study of the site of Guéssédoundou shows that karstic phenomena can also exist in silico-aluminous formations of crystalline rocks. [less ▲]

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See detailHeat generation and transfer due to friction and plastic dissipation - a coupled thermomechanical approach
Adam, L.; Ponthot, Jean-Philippe ULg

in Proceedings of HEFAT 2003, 2nd International conference on Heat Transfer, Fluid Mechanics and Thermodynamics (2003)

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See detailL'histoire des religions et les représentations du temps. En guise de préambule
Pirenne-Delforge, Vinciane ULg

in Pirenne-Delforge, Vinciane; Tunca, Önhan (Eds.) Représentations du temps dans les religions. Actes du Colloque organisé par le Centre d'histoire des religions de l'Université de Liège (2003)

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See detailEffects of grassed buffer strip management on potential denitrification in a belgian agricultural watershed
Cors, Marie; Tychon, Bernard ULg

Conference (2003)

Riparian buffer strips are managed for the enhancement of water quality through control of non point source pollution. Denitrification in riparian buffer strips is thought to be the major process -with ... [more ▼]

Riparian buffer strips are managed for the enhancement of water quality through control of non point source pollution. Denitrification in riparian buffer strips is thought to be the major process -with nitrate uptake by plant growth- that reduces nitrate input in surface water. We investigated the Denitrifier Enzyme Activity (DEA) to test how the buffer strip management modifies the denitrification process. The experimental site is composed of a crop field and a 11 m wide grassed buffer strip at the border between the crop field and a tributary to the Attert river, South-East Belgium. Soil samples from the crop field and the buffer strip have been submitted to different imposed conditions combining glucose, nitrate and water saturation to investigate how antecedent water regime, nitrate and carbon content affect denitrification. The work included DEA measurements on undisturbed soil cores freshly sampled. Experiments on undisturbed soil cores identify the buffer strip as more effective in denitrification (p < 0.001) than the cropped field. However, experiments on samples conditioned under imposed carbon and/or nitrate contents emphasised the importance of micro-topography. [less ▲]

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See detailKarsts en roches cristallines silicatées non carbonatées. Cas dans des gneiss : la grotte de Mfoula, Sud Cameroun
Willems, Luc ULg; Pouclet, André; Vicat, Jean-Paul

in Actes des Journées Européennes de l'AFK 2003 (2003)

Since the Seventies, a séries of phenomena developed in non carbonated silicated rocks question the traditional vision of karst. The term of karst is used in the meaning of "any feature of the classical ... [more ▼]

Since the Seventies, a séries of phenomena developed in non carbonated silicated rocks question the traditional vision of karst. The term of karst is used in the meaning of "any feature of the classical karst morphology (caves, sink-holes, lapiaz...) where dissolution plays the main genetic action and this in any kind of rocks". The cave of Guéssédoundou illustrâtes a karst in métagabbros. It opens at the top of a small hill, in a dépression twenty meters long and three to four meters deep. The walls of this dépression are subvertical and the bottom is partially occupied by angular pluridecimetric blocks. The cave is opened on several meters in the southern side of the dépression and is prolonged in the form of too narrow conduits to be explore. The bedrock is a metagabbro with fine grains, slightly weathered, crossed by decimetric quartzose veins. Gabbroïc texture is preserved, as well as part of magmatic plagioclases. The remainder is transformed into a mixture of white feldspar and clinozoisite. Pyroxene are pseudomorphosed in actinote and chlorite. The site dépression was created along a N 10° shear zone where rocks suffered important fracturation and fluid transfers, as shown by its silification and ferruginisation.. Moreover, a East-West schistosity, former to shearing, structures the gabbro. The présence of angular blocks of variable size and the absence of human activity trace on the site show that the dépression was formed naturally by collapse of the roof of a more vast cavity whose current cave would be the visible residual prolongation. The absence of flow traces and mechanical abrasion means that this cavity is due only to chemical érosion . At the cave entry and on the subvertical walls of the dépression were formed by alveoli a few centimètres to a few décimètres in diameter. Thèse alveoli of wall are known in other lithologies, in particular in limestones. The absence of salts within the rock draws aside a formation by sait weathering. The smooth aspect and non fractured walls of the cells cannot resuit from a corrosion to a fracturing node. The closed aspect of the dépression and the absence of flow trace eliminate the assumptions from formation by water swirls or eolisation. The genesis of the cave must be earlier to the installation of a weathering cover since the rock is little deteriorated and the alveoli are not developed on a quite particular level which would correspond to a précise pedogenic horizon. Only a generalized dissolution of the métagabbros, in relation to a slow solution circulation, being carried out with the favour of the fracturing plans of the shearing zone makes it possible to explain the formation of the alveoli. The inversion of relief results from a weaker érosion of the rocks made more résistant to this place by the quartz seam mainstay and by the ferruginisation along the shearing zone. In the other hand, the crushed rocks, become porous, drained the infiltrations of meteoric water, facilitating the dissolution processes. The study of the site of Guéssédoundou shows that karstic phenomena can also exist in silico-aluminous formations of crystalline rocks [less ▲]

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See detailOrigine et impact des risques biologiques, physiques et chimiques
Samb, Babacar; Schiffers, Bruno ULg

in Proceedings Bio-Scope - Atelier "Responsable Assurance Qualité Totale" (2003)

La préservation de la santé des consommateurs est devenue une préoccupation majeure en ce début de nouveau millénaire marqué par le poids de la société civile en général et des ligues de consommateurs en ... [more ▼]

La préservation de la santé des consommateurs est devenue une préoccupation majeure en ce début de nouveau millénaire marqué par le poids de la société civile en général et des ligues de consommateurs en particulier. Les exigences en termes de qualité sanitaire et de traçabilité, qui figurent non seulement dans des réglementations toujours plus strictes mais aussi dans des référentiels de qualité ou des cahiers de charge imposés aux producteurs, traduisent la volonté des consommateurs européens de savoir où, comment et quand les aliments qu'ils ont dans leur assiette ont été produits. [less ▲]

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See detailA probabilistic approach to power system network planning under uncertainties
Vassena, Stefano; Mack, Philippe; Druet, Christophe et al

in Proceedings of the IEEE Bologna Power Tech Conference (2003)

This work proposes a methodology and a practical tool for the study of long-term network planning under uncertainties. In this approach the major external uncertainties during the planning horizon are ... [more ▼]

This work proposes a methodology and a practical tool for the study of long-term network planning under uncertainties. In this approach the major external uncertainties during the planning horizon are modeled as macroscenarios at different future time instants. On the other hand, the random nature of actual operating conditions is taken into account by using a probabilistic model of microscenarios based on past statistics. Massive Monte-Carlo simulations are used to generate and simulate a large number of scenarios and store the detailed results in a relational database. Data mining techniques are then applied to extract information from the database so as to rank scenarios and network reinforcements according to different criteria. [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 detailEtude des modifications environnementales à partir des données pluviométriques et NDVI de NOAA-AVHRR en Afrique de l’Ouest
Hountondji, Yvon ULg; Ozer, Pierre ULg; Tychon, Bernard ULg

in Schmitz, Serge; Meert, Henk (Eds.) Les Journées des Géographes Belges: Evaluer la capacité du milieu (2003)

Since the late 1960s, The Sahel of West Africa is affected by a long-term drought and increasing human pressure on the environment leading to desertification processes. The Normalised Difference ... [more ▼]

Since the late 1960s, The Sahel of West Africa is affected by a long-term drought and increasing human pressure on the environment leading to desertification processes. The Normalised Difference Vegetation Index (NDVI), calculated from satellite imagery, is a reliable index of the vegetation status as the vegetation response to rainfall is very strong in semiarid environments. This article presents the NDVI and rainfall evolution from 1981 to 1999 in nine locations along a north-south transect from north-western Niger to north-eastern Benin. These two parameters are then statistically analysed to identify breaks in the trends within the datasets. Over the 19 years analysed, it appears that five out of the nine locations have recorded a significant increase of rainfall, while only two presented a significant increase in NDVI. This dichotomy in observed trends may highlight the on-going slow processes of environmental degradation. [less ▲]

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See detailA longitudinal study of isokinetic characteristics of young athletes and prevention of muscular and joint injury: Preliminary results - Abstract
Amato, M.; Afriat, P.; Portero, P. et al

in Isokinetics & Exercise Science (2003), 11(1), 53-54

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See detailSept cas de réussite "atypique" éclairée par des données longitudinales familiales et scolaires
Schillings, Patricia ULg; Poncelet, Débora

in Actes du 16ème colloque international de l'ADMEE-Europe Evaluation: entre efficacité et équité (2003)

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See detailDes indicateurs d'équité : une question de point de vue
Baye, Ariane ULg

in L'école, dans quel(s) sens ? Actes du 2e congrès des chercheurs en éducation, Louvain-la-Neuve, 12-13 mars 2002 (2003)

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See detailIndividualized versus standardized exercise training for claudicant patients.
Magne, Julien ULg; Boccalon, H; Bouley, M et al

Conference (2003)

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See detailElectromagnetic force density in a ferromagnetic material
Henrotte, François; Vande Sande, Hans; Deliège, Geoffrey ULg et al

Conference (2003)

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See detailForecasting Skill Assessment of a Doubly, Two-Way Nested Model of the Ligurian Sea driven by Assimilation of Sea Surface Temperature
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Rixen, M. et al

Conference (2003)

The GHER 3D primitive equation model is implemented with threedifferent resolutions: a low resolution model (1/4Ž°) coveringthe whole Mediterranean Sea, an intermediate resolution model (1/20Ž°)of the ... [more ▼]

The GHER 3D primitive equation model is implemented with threedifferent resolutions: a low resolution model (1/4Ž°) coveringthe whole Mediterranean Sea, an intermediate resolution model (1/20Ž°)of the Liguro-Provençal basin and a high resolution model (1/60Ž°)simulating the fine mesoscale structures in the Ligurian Sea. Boundaryconditions and the averaged fields (feedback) are exchanged betweentwo successive nesting levels. The model of the Ligurian Sea is also coupled with the assimilationpackage SESAM. It allows to assimilate satellite data and in situobservations using the local adaptative SEEK (Singular EvolutiveExtended Kalman) filter. Instead of evolving the error space by thenumerically expensive Lyapunov equation, a simplified algebraicequation depending on the misfit between observation and modelforecast is used. Starting from the 1st January 1998 the low and intermediate resolutionmodels are spun up for 18 months. The initial conditions for theLigurian Sea are interpolated from the intermediate resolutionmodel. The three models are then integrated until August 1999. Duringthis period AVHRR Sea Surface Temperature of the Ligurian Sea isassimilated. The results are validated by using CTD and XBT profilesof the SIRENA cruise from the SACLANT Center. In a second validation exercise,the AVHRR SST and model forecast %(not yet affected by the SST used for validation) are decomposed at different scalesusing a horizontal wavelet transform.The processes characteristic for each scale are isolated in the model and the SST images.The error statistics calculated on the wavelet amplitudes can thus be related to the ability of the model in forecasting the correspondingmarine processes. In a second validation exercise, the AVHRR SST and model forecast areboth decomposed at different scales using a horizontal wavelet transform.The characteristic processes for each scale are isolated in the modeland the SST images. The error statistics calculated on the waveletamplitudes can thus be related to the ability of the model inforecasting the corresponding marine processes. [less ▲]

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See detailIntegral and derivative dispersion relations in the analysis of the data on p p and anti-p p forward scattering
Cudell, Jean-René ULg; Martynov, E.; Selyugin, Oleg V

in Ukrainian Journal of Physics (2003), 48(Nos. 11- 12, 2003),

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See detailThe State of the Art in Multiple Object Tracking Under Occlusion in Video Sequences
Gabriel, Pierre F.; Verly, Jacques ULg; Piater, Justus ULg et al

Conference (2003)

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See detailDisorders of lambs thyroid by a glucosinolate metabolite: the 5-vinyl-l,3-oxazolidine-2-thione (5-VOT)
Mabon, N.; Mandiki, S.; Bister, J.-L. et al

Conference (2003)

The impact of 5-VOT on thyroid was studied in two lambs. They received ad libitum water, hay and concentrates without rapeseed from ten days of age till weaning (65 days of age). At 85 days of age, one of ... [more ▼]

The impact of 5-VOT on thyroid was studied in two lambs. They received ad libitum water, hay and concentrates without rapeseed from ten days of age till weaning (65 days of age). At 85 days of age, one of them was fed with the same diet but mixed with 100g/d of a rapeseed containing high level of progoitrin: 71.4µmol/g DM (variety Jet Neuf). Blood samples were taken fortnightly for the determination of TSH (Thyroid Stimulating Hormone), T3 (Tri-iodothyronin) and T4 (thyroxin) plasma concentrations. [less ▲]

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See detailMultifunctionality : realities and local stakes construction
Vanloqueren, Gaetan; Stassart, Pierre M ULg; Baret, Philipppe

Conference (2003)

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See detailSWAP: Sun watcher using APS detector on-board PROBA-2, a new EUV off-axis telescope on a technology demonstration platform
Defise, Jean-Marc ULg; Berghmans, David; Hochedez, Jean-Francois E et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2003)

SWAP (Sun Watcher using Active Pixel System detector and Image Processing) is an instrument that has been selected to fly on the PROBA-II technology demonstration platform, a program of the European Space ... [more ▼]

SWAP (Sun Watcher using Active Pixel System detector and Image Processing) is an instrument that has been selected to fly on the PROBA-II technology demonstration platform, a program of the European Space Agency (ESA) to be launched in 2006. This paper presents the instrument concept and its scientific goals. SWAP uses an off-axis Ritchey Chretien telescope that will image the EUV solar corona at 19.5 nm on a specifically fabricated extreme ultraviolet (EUV) sensitivity enhanced CMOS APS detector. This type of detector has advantages that promise to be very profitable for solar EUV imaging. The SWAP design is built on a similar concept as the MAGRITTE instrument suite for the NASA Solar Dynamics Observatory (SDO) mission to be launched in 2007. The optics have been adapted to the detector size. The SWAP PROBA-2 program will be an opportunity to demonstrate and validate the optical concept of MAGRITTE, while it will also validate space remote sensing with APS detectors. On the science outcomes, SWAP will provide solar corona images in the Fe XII line on a baselined 1-min cadence. Observations with this specific wavelength allow detecting phenomena, such as solar flares or 'EIT-waves", associated with the early phase of coronal mass ejections. Image recognition software will be developed that automatically detects these phenomena and sends out space weather warnings. Different modules of this software will run both on the ground system as well as on the onboard computer of PROBA II. The SWAP data will complement the observations provided by SOHO-EIT, and STEREO-SECCHI. [less ▲]

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See detailPhosphate mineral occurrences in Lake Baïkal sediments : Paleo-environment or diagenesis record ?
Fagel, Nathalie ULg; Alleman, L. Y.; André, Luc et al

Poster (2003)

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See detailSelective adsorption of dioxins and PCBs from marine oils on activated carbon
De Meulenaer, Bruno; Maes, Jeroen; Van Heerswynghels, Peter et al

in Organohalogen Compounds (2003)

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See detailCould diffuse modes of failure be analyzed by a material instability condition?
Darve, Félix; Servant, Guillaume; Collin, Frédéric ULg et al

Conference (2003)

Localized modes of failure are classically analyzed by a plastic strain localization criterion given by the vanishing values of the determinant of the acoustic tensor. However, some failure modes do not ... [more ▼]

Localized modes of failure are classically analyzed by a plastic strain localization criterion given by the vanishing values of the determinant of the acoustic tensor. However, some failure modes do not exhibit any localization pattern and a crucial question appears : what is the proper criterion for diffuse failure ? An answer attempt is proposed in this paper in both frameworks of continuum mechanics and discrete mechanics through the second order work criterion. [less ▲]

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See detailParameter identification for inverse problems in metal forming simulation
KLEINERMANN, J. P.; Ponthot, Jean-Philippe ULg; Hogge, Michel ULg

in Proceedings of FIELD ANALYSIS FOR DETERMINATION OF MATERIAL PARAMETERS. EXPERIMENTAL AND NUMERICAL ASPECTS (2003)

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See detailVLT Observations of two Unusual BAL Quasars
Hall, Patrick; Hutsemekers, Damien ULg

in Active Galactic Nuclei: From Central Engine to Host Galaxy. ASPC 290 (2003)

The SDSS has confirmed the existence of populations of broad absorption line quasars with extreme properties. I will discuss the discovery of redshifted absorption troughs (confirmation of a rotating disk ... [more ▼]

The SDSS has confirmed the existence of populations of broad absorption line quasars with extreme properties. I will discuss the discovery of redshifted absorption troughs (confirmation of a rotating disk wind?), absorption from FeIII but not FeII (a very large column density of moderately ionized gas?), extremely reddened objects (extinction curves even steeper than that of the SMC), objects with overlapping troughs that remove 90% of the flux below MgII, and two mysterious objects which may or may not be unusual BALs. Implications of these objects for quasar and BAL outflow models will be discussed, along with preliminary results of various followup observations. [less ▲]

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See detailStudy of the behaviour of welded joints between elliptical hollow sections
Pietrapertosa, C.; Jaspart, Jean-Pierre ULg

in Proceedings of the 10th International Symposium on Tubular Structures (2003)

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See detailLevels of PCDDs, PCDFs and PCBs in International Fast Food Samples
Focant, Jean-François ULg; Pirard, Catherine; De Pauw, Edwin ULg

in Organohalogen Compounds (2003), 60-65

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See detailLa leptine et les hormones métaboliques chez trois races de bovins viandeux
Pirotte, Cécile ULg; Bister, J. L.; Cabaraux, Jean-François ULg et al

in 10èmes Rencontres autour des Recherches sur les Ruminants (2003)

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See detailOxidant activity of rabbit synoviocytes (HIG-82) demonstrated by oxymetry and ethylene production.
Schneider, Nicole ULg; Lejeune, Jean-Philippe ULg; Mouithys-Mickalad, Ange ULg et al

Poster (2003)

We are interested in a possible role of synoviocytes in the ROS production implicated in osteoarthritis, therefore we studied the response of a rabbit synoviocyte cell line (HIG-82) to variable oxygen ... [more ▼]

We are interested in a possible role of synoviocytes in the ROS production implicated in osteoarthritis, therefore we studied the response of a rabbit synoviocyte cell line (HIG-82) to variable oxygen tensions and the oxidant activity of these cells in response to stimuli. Synoviocytes were cultured at 5 and 21 % O2, their O2 consumption (cellular respiration, monitored with Clark electrode) was measured at 21% O2 and after anoxia, before and after stimulation with phorbol myristate acetate (PMA), and their oxidant response to PMA stimulation was quantified by measuring ethylene (gas chromatography) released when the substrate, alpha-keto-gamma-methylbutyric acid, is oxidised by the ROS produced by the cells. Cell growth was faster at 21 % O2 than at 5% O2, and microscopic observation revealed 2 cell populations: a few small round cells in suspension and many adherent cells. By oxymetry, we observed that a 106 synoviocytes suspension in 2 ml completely consumed O2 within 15 min, that anoxia (7 min) slightly slowed the respiration rate down and that PMA stimulation increased O2 consumption (150 % increase). The oxidant activity (ethylene production) of the cells was stimulated by PMA in a dose-dependent manner (10-9 to 10-7M) but the cell response was highly variable (from 150 to 1500 % increase) and was largely reduced by diphenyliodonium, an inhibitor of NADPH-oxidase and NO-synthase. The capacity to produce free radical species was confirmed for the small round cells by detection of an electron paramagnetic resonance (EPR) signal after stimulation. These results thus demonstrate a sensibility to O2 and an oxidant activity of synoviocytes at least related to ROS production by NADPH-oxidase activity. [less ▲]

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See detailTesting and modelling of welded joints between elliptical hollow sections
Bortolotti, E.; Jaspart, Jean-Pierre ULg; Pietrapertosa, C. et al

in Proceedings of the 10th International Symposium on Tubular Structures (2003)

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See detailEstimation of genetic parameters of test-day records for milk yield for the first three lactations of French Holstein cows
Druet, Tom ULg; Jaffrézic, F.; Ducrocq, V.

in Book of Abstracts of the 54th Annual Meeting of the European Association for Animal Production (2003)

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See detailEntomopathogenic activity of Beauveria bassiana against Psoroptes cuniculi
Lekimme, M.; Mignon, Bernard ULg; Tombeux, S. et al

Poster (2003)

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See detailPresent day and geologic deformation rates in the Ardenne and the lower Rhine embayment (North-western Europe)
Van Camp, Michel; Camelbeeck, Thierry; Vanneste, K. et al

Conference (2003)

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See detailMorale et conscience chez Dom Gerberon
Vanhoorne, Frédérick ULg

in L’Ordre de Saint-Benoît et Port-Royal : Actes du colloque de Paris, 19-21 septembre 2002 (2003)

Dom Gabriel Gerberon (1628-1711) publie en 1688 un petit ouvrage in-12 intitulé La Règle des mœurs contre les fausses maximes de la morale corrompue. Ce volume s’intègre dans la longue polémique autour de ... [more ▼]

Dom Gabriel Gerberon (1628-1711) publie en 1688 un petit ouvrage in-12 intitulé La Règle des mœurs contre les fausses maximes de la morale corrompue. Ce volume s’intègre dans la longue polémique autour de la casuistique et du probabilisme. Il défend vigoureusement la position des rigoristes, en parfait accord avec l’argumentation pascalienne et port-royaliste. Mais le but que poursuit Gerberon dans son ouvrage n’est pas de rédiger un abrégé de morale pratique. L’auteur entend plutôt analyser de manière critique les différents principes, critères et moyens par lesquels les individus parviennent à la connaissance et à l’application des principes de morale. Gerberon met en évidence le rôle central de la conscience dans ce processus et s’attache à en détailler les tenants et les aboutissants. Au cours de son exposé, qui constitue un plaidoyer pour les droits de la conscience, il s’appuye sur les analyses thomistes classiques, mais en les rappelant dans un contexte polémique au sein d’un siècle absolutiste, il développe un discours audacieux, dont le caractère individualiste résonne d’accents port-royalistes. [less ▲]

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See detailP2X1-induced activation of Ca2+ calmodulin leads to myosin light chain and ERK2 phosphorylation in human platelets.
Toth-Zsamboki, Emese; Oury, Cécile ULg; De Vos, Rita et al

in Journal of Thrombosis and Haemostasis [=JTH] (2003)

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See detailThe use of DORIS as a tool to study the Earth ionosphere
Warnant, René ULg; Morel, Laurent; Stankov, Stanimir et al

Conference (2003)

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See detailSpectroscopic characterisation of Pd/SiO2 sol-gel prepared catalysts
Beketov, Gennadiy; Heinrichs, Benoît ULg; Lambert, Stéphanie ULg et al

Poster (2003)

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See detailOn-axis VLT spectroscopy of quasar host galaxies: HE 1503+0228, at z=0.135
Courbin, F.; Letawe, Géraldine ULg; Magain, Pierre ULg et al

in Active Galactic Nuclei: From Central Engine to Host Galaxy (2003)

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See detailLa dendrochronologie de l'architecture
Hoffsummer, Patrick ULg

in Au-delà de l'écrit: les hommes et leurs vécus matériels au Moyen Âge à la lumière des sciences et des techniques, nouvelles perspectives (2003)

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See detailDeficient splines wavelets
Bastin, Françoise ULg; Laubin, P.; Kerner, R. et al

in Group 24 : Physical And Mathematical Aspects Of Symmetries (2003), 173

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See detailIn vivo detection of three Microsporum canis subtilisin-like serine protease mRNAs in infected guinea-pigs
Descamps, F.; Brouta, F.; Vermout, S. et al

Conference (2003)

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See detailGlycoprotein Ib and integrin alphaIIbbeta3 contribute to GPVI-dependent vWF-collagen induced thrombus formation under flow
Kuijpers, Marijke; Oury, Cécile ULg; Schulte, V. et al

in Journal of Thrombosis and Haemostasis [=JTH] (2003)

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See detailThe novel somatostatin analog SOM230 has a broad spectrum of inhibitory action on hormone release by human somatotroph, corticotroph and PRL-secreting pituitary adenomas in vitro
Hofland, L. J.; Van Der Hoek, J.; Van Koetsveld, P. M. et al

in The 85th Annual Meeting of the Endocrine Society - Abstract book (2003)

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See detailEtude de l'origine biosynthétique de composes défensifs de Chrysomellidae
Dooms, Cédric; Ghostin, Jean; Laurent, Pascal ULg et al

Poster (2003)

Les chrysomèles sont des insectes brillamment colores, formant des agrégats denses sur leur plante-hôte et sont considérées comme de véritables fléaux pour les cultures. La présence de glandes défensives ... [more ▼]

Les chrysomèles sont des insectes brillamment colores, formant des agrégats denses sur leur plante-hôte et sont considérées comme de véritables fléaux pour les cultures. La présence de glandes défensives a été mise en évidence chez les larves et chez les adultes de nombreuses espèces de cette famille. La récente découverte de glycosides triterpéniques dérivés de la b-amyrine (comme par exemple le ligatoside A) dans la sécrétion défensive de plusieurs espèces appartenant a la sous tribu Doryphorina est tout a fait inattendue et soulève le problème de leur origine biogénétique. Une biosynthèse de novo de ce type de dérivé par les chrysomèles est en effet peu probable étant donne que les insectes ne disposent pas des enzymes nécessaires a la fabrication des stéroïdes et des triterpènes. La séquestration des produits tels quels au départ de la plante-hôte est également peu probable. En effet, la composition chimique de la sécrétion défensive de ces chrysomèles est indépendante des plantes-hôte et celles-ci ne contiennent pas de tels dérivés. Une troisième possibilité serait la modification par les chrysomèles d'un précurseur commun a ces différents triterpènes et présent dans leur alimentation. Un tel précurseur pourrait être la b-amyrine, identifiée chez différentes plantes-hôte des chrysomèles, ou 1'acide oléanolique dont le squelette se retrouve au niveau des triterpènes défensifs. Dans le cadre de ce travail, nous présenterons les synthèses de la b-amyrine et de 1'acide oléanolique marqués au deutérium et les premiers résultats d'incorporation de ces précurseurs chez Platyphora kollari. Par ailleurs, nous présenterons également la synthèse de 1'a-amyrine tri-deuteriée. Ce triterpène a en effet été mis en évidence dans les plantes-hôtes des chrysomèles alors qu'aucun composé défensif basé sur le squelette ursane n'a été isolé jusqu'a présent de ces insectes. Il serait donc intéressant d'observer si le précurseur deuterié est incorporé ou non par Platyphora kollari. [less ▲]

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See detailProcessing GPS measurements during periods of high ionospheric activity
Warnant, René ULg; Grevesse, Jonathan; Pottiaux, Eric

in Proceedings of EUREF 2002 Symposium (2003)

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See detailStochastic modelling of the hydrogeological environment in low permeability sediment
Huysmans, Marijke; Berckmans, Arne; Feyen, Luc et al

in Proceedings of IAMG 2003 (2003)

In Belgium, the Boom Clay is being considered as a potential host formation for the disposal of nuclear waste. Part of the safety assessment and feasibility studies of a potential nuclear waste disposal ... [more ▼]

In Belgium, the Boom Clay is being considered as a potential host formation for the disposal of nuclear waste. Part of the safety assessment and feasibility studies of a potential nuclear waste disposal consists of hydrogeological modeling. In order to model the groundwater flow and possible radionuclide transport in the clay, the spatial distribution of the hydraulic conductivity of the clay has to be assessed. In this study, geostatistical methods are used to characterize the hydraulic conductivity field. More specific, direct sequential simulation of the hydraulic conductivity is carried out, using measurements of hydraulic conductivity and 4 types of soft data or secondary variables: resistivity logs, gamma ray logs, grain size measurements and descriptions of the lithology. The primary and secondary information is analyzed with geostatistical tools and combined to generate 100 fields of the hydraulic conductivity of the Boom Clay. Next, each field is input to a groundwater flow model to predict the advective travel time of constituents released from the disposed waste in the Boom Clay to the aquifers surrounding the Boom Clay. Statistical analysis of the ensemble of model predictions results in a predictive distribution for the advective travel time. This distribution reflects the uncertainty of the advective travel time that results from the uncertainty of the spatial distribution of the hydraulic conductivity of the Boom Clay [less ▲]

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See detailThe eggshell approach for the computation of electromagnetic forces in 2D and 3D
Henrotte, François; Deliège, Geoffrey ULg; Hameyer, Kay

in Sixth International Symposium on Electric and Magnetic Fields, EMF 2003: Aachen, Germany, October 6-9, 2003 (2003)

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See detailInfluence of social and non-social environmental enrichment on the behaviour of caged rabbits.
Vandenheede, Marc ULg; Halloy, D.

in Ferrante, V. (Ed.) Proceedings of the 37th International Congress of the International Society for Applied Ethology (2003)

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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 detailFeeding behaviour of weaned pigs fed either pellets or meal: effects of the number of aniamls per feeding place
Laitat, Martine ULg; Vandenheede, Marc ULg; Desiron, Alain et al

in Ferrante, V. (Ed.) Proceedings of the 37th International Congress of the International Society for Applied Ethology (2003)

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See detailSynthèse d'analogues de tétraponérines, alcaloïdes défensifs des fourmis du genre Tetraponera
Rouchaud, Anne; Durvaux, Christophe; Laurent, Pascal ULg et al

Poster (2003)

Les fourmis du genre Tetraponera appartiennent a la sous-famille des Pseudomyrmecinae et sont exceptionnelles par leur comportement défensif particulier. En effet, en cas d'attaque, ces fourmis disposent ... [more ▼]

Les fourmis du genre Tetraponera appartiennent a la sous-famille des Pseudomyrmecinae et sont exceptionnelles par leur comportement défensif particulier. En effet, en cas d'attaque, ces fourmis disposent leur abdomen latéralement et badigeonnent la cuticule de 1'adversaire au moyen de leur aiguillon en forme de tire-ligne. L'injection en chromatographie gazeuse capillaire de cette sécrétion a montre qu'elle était constituée de huit dérivés, les tétraponérines T-1 à T-8. Ces molécules se rattachent a des squelettes tricycliques originaux et possèdent des propriétés neurotoxiques et insecticides. Dans le cadre d'une étude structure-activité de ces alcaloïdes, nous nous sommes intéressés à la synthèse d'analogues basés sur un squelette décahydro-dipyrido[l,2-a : 1’,2'-c]pyrimidine. Ce travail s'inspire d'une synthèse des tétraponérines T-1, T-2, T-5 et T-6 basée sur la réaction « one pot» entre deux molécules de 1-pyrroline et du malonate de diéthyle pour former un lactame tricyclique. Les différentes conditions réactionnelles utilisées pour synthétiser la molécule à partir de 1-pipéridéine et de malonate de diéthyle, ainsi que la nature et la détermination de structure des produits obtenus dans chaque cas seront discutées. [less ▲]

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See detailSeismic performance of ductile steel moment frames designed according to Eurocode 3 and Eurocode 8. First step for Eurocode calibration
Sanchez-Ricart, L.; Plumier, André ULg

in Proceedings of the STESSA 2003 Conference (2003)

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See detailInfluence de la taille de la matrice des projections sur la résolution et l’uniformité en tomoscintigraphie avec collimateur sténopé.
Seret, Alain ULg

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2003), 27(9), 460

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See detailEffects of O2 tension and glucose concentration on the cellular respiration of equine articular chondrocytes in culture.
Schneider, Nicole ULg; Lejeune, Jean-Philippe ULg; Mouithys-Mickalad, Ange ULg et al

Poster (2003)

In vivo, articular chondrocytes are exposed to 5 to 10% O21,2. Chondrocytes are also suspected to produce reactive oxygen species when submitted to anoxia/re-oxygenation3,4. We were interested to study ... [more ▼]

In vivo, articular chondrocytes are exposed to 5 to 10% O21,2. Chondrocytes are also suspected to produce reactive oxygen species when submitted to anoxia/re-oxygenation3,4. We were interested to study the effects of O2 and glucose variations on cellular respiration, glucose consumption and lactate production. Equine articular chondrocytes were cultured in suspension for 2 days under 5 or 21 % O2 in the gaseous phase, and with 0, 1.0 or 4.5 g/L glucose. The viable cells were then counted and the respiration rate (O2 consumption) of 10.106 cells was monitored by oxymetry for 2 hours; after oxymetry, glucose and lactate were measured in the medium (enzymatic assays). After 2 days, the cell viability was the best at 5% O2 and 1g/L glucose; it decreased at 4.5 g/L glucose and was the worst at 0g/L glucose, for the two O2 tensions (n=3). There was no obvious difference of the respiration rate between cells cultured at 5 and 21% O2, but respiration of chondrocytes was surprisingly low. When cells were submitted to 20 min anoxia at 0% O2, the O2 consumption was doubled at re-oxygenation for cells previously cultured at 21% O2. Glucose and lactate values found in the medium after oxymetry : lactate release in medium was similar (36.23 and 34.57 mg/L respectively) for cells cultured with 1g glucose and 5 or 21% O2 conditions; lactate values were low (2.03 and 8,63 mg/L respectively) for 4.5 g glucose and 5 or 21% O2. Glucose uptake was not different whatever the culture conditions. These results indicate a low cellular respiration with a lactate production linked to the glucose concentration in the medium, and raise the question of the capacity of chondrocytes to produce ROS in vivo starting from the mitochondrial chain. [less ▲]

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See detailDecidability of invariant validation for paramaterized systems
Fontaine, Pascal; Gribomont, Pascal ULg

in Lecture Notes in Computer Science (2003), 2619

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

Poster (2003)

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See detailSedimentology of the Frasnian carbonate platform of Belgium, Facies and magnetic susceptibility
Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg

in Abstract book 12th Bathurst meeting of carbonate sedimentologists (2003)

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See detailGlucosinolates metabolites in plasma, milk and thyroid of gestating and lactating ewes
Mabon, N.; Mandiki, S.; Derycke, G. et al

Poster (2003)

The effects of high level of rapeseed meal in the diet on the concentration of antinutritional factors (glucosinolates metabolites) in blood plasma, milk and thyroid were studied in 90 ewes. From the ... [more ▼]

The effects of high level of rapeseed meal in the diet on the concentration of antinutritional factors (glucosinolates metabolites) in blood plasma, milk and thyroid were studied in 90 ewes. From the 100th day of gestation, ewes bearing two foetuses were divided into three groups and were fed with pasture hay ad libitum and 500 g/d of diet containing 0 or 40% rapeseed meal obtained from either Apex or Synergy variety. During the 47 first days of lactation, 1200 g/d of the same meal were given. Thereafter, during 3 weeks, the ewes were only fed with hay. Blood and milk samples were taken fortnightly for the determination of SCN- and 5-vinyl-1,3- oxazolidine-2-thione (5-VOT) concentrations. One ewe from each group was slaughtered at the end of rapeseed meal distribution and another one three weeks later for thyroid analyses. SCN- and 5-VOT concentrations in blood plasma increased significantly (P<0.05) and regularly until one month of rapeseed supplementation to the withdrawal of rapeseed in the diet. One to three weeks after the end of rapeseed meal distribution, the SCN- and 5-VOT plasma concentrations came back at the basal level. Some changes were also observed for SCN- and 5-VOT contents in milk. The results indicated a great capacity of the ewes to excrete SCN- and 5-VOT by the milk. A 5-VOT accumulation was observed in the thyroid according to the level of progoitrin in the diet, but no SCN- accumulation. The 5-VOT concentration in thyroid of the ewes fed during three weeks with hay came back to zero. The thyroid analysis showed the reversible aspect of the thyroid hypertrophy due to 5-VOT accumulation. [less ▲]

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See detailFe/SiO2 sol-gel catalysts synthesised from various iron complexes for N2O decomposition and C3H6 oxidation by N2O
Heinrichs, Benoît ULg; Maxim, Nicolae; Abbenhuis, Hendrikus C L et al

Poster (2003)

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See detailSynthesis of [18F]fluorinated a-methyl-a-amino acids by phase transfer catalysis for potential PET application.
Wouters, L.; Lemaire, Christian ULg; Plenevaux, Alain ULg et al

in Journal of Labelled Compounds & Radiopharmaceuticals (2003), 46

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See detailValidation and discussion of CALUX analysis for marine samples
Windal, Isabelle; Van Wouwe, Nathalie; Carbonnelle, Sophie et al

in Organohalogen Compounds (2003)

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See detailThe hunt for early eukaryotes in Archean and Proterozoic oceans
Javaux, Emmanuelle ULg; Knoll, A. H.; Marshall, C. P. et al

Poster (2003)

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See detailComplex Hydrogeological Study of the Alluvial Transboundary Aquifer of Szamos/Somes (Romania-Hungary)
Lenart, Laszlo; Madarasz, Tamas; Miko, Lajos et al

in Water resources management in the 21th century. Subtheme 4, Relevance and sustainability of the intensive groundwater developments (2003)

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See detailLe modèle WOLF : outil de modélisation d'écoulement de crue, de dimensionnement et de gestion des ouvrages hydrauliques
Pirotton, Michel ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Actes du colloque annuel du CEBEDEAU : Gestion des eaux pluviales et assainissement (2003)

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See detailThe Hybrid Scalar and Vector Potential Formulation for Magnetic Field Computations by means of the FE Method
Gyselinck, J.; Vandevelde, L.; Geuzaine, Christophe ULg et al

in Proceedings of the 14th Conference on the Computation of Electromagnetic Fields, COMPUMAG 2003 (2003)

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See detailFirst experiences with a Water Vapour Radiometer at the Royal Observatory of Belgium
Pottiaux, Eric; Warnant, René ULg

in Proceedings of EUREF 2002 Symposium (2003)

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See detailFormer des étudiants de première candidature universitaire à des compétences transversales : lesquelles et comment ?
Leclercq, Dieudonné ULg

in L'école, dans quel(s) sens ? Actes du 2e congrès des chercheurs en éducation, Louvain-la-Neuve, 12-13 mars 2002 (2003)

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See detailBelgian Report to the IAG-subcommission “EUREF”
Bruyninx, Carine; Defraigne, Pascale; Ducarme, Bernard et al

in Proceedings of EUREF 2002 Symposium (2003)

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See detailNormes et textes en vigueur pour la validation
Hubert, Philippe ULg

Conference (2003)

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See detailT cell subsets in the respiratory tract of dogs without respiratory disease : preliminary results.
Peeters, Dominique ULg; Day, M. J.; Moore, P. et al

in Proceedings of the 13th Annual Congress of the ECVIM-CA (2003)

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See detailSolid lipid Nanoparticles for drug Pumonary Administration
Sanna, Vanna; Kirschvink, Nathalie; Gustin, Pascal ULg et al

in Proceedings of 30th International Symposium on Controlled Release of Bioactive Materials (2003)

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