References of "Scientific congresses and symposiums"
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See detailQui est la Kourotrophos athénienne ?
Pirenne-Delforge, Vinciane ULg

in Dasen, Véronique (Ed.) Naissance et petite enfance dans l'Antiquité, Actes du colloque de Fribourg, 28 novembre-1er décembre 2001 (2004)

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See detailChanges in carcass and meat composition during the finishing of Belgian Blue double-muscled cull cows
Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg; Istasse, Louis ULg et al

in Book of absracts of the 55th Annual Meeting of the European Association for Animal Production (2004)

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See detailProper Orthogonal modes for the characterisation of nonlinear dynamic systems
Kerschen, Gaëtan ULg; Lenaerts, Vincent; Golinval, Jean-Claude ULg et al

in Euromech Colloquim on Nonlinear Modes of Vibrating Systems, Frejus, 2004 (2004)

Modal analysis is extensively used for the analysis and design of structures. However, a major concern for structural dynamicists is that its validity is limited to systems showing a linear behaviour. New ... [more ▼]

Modal analysis is extensively used for the analysis and design of structures. However, a major concern for structural dynamicists is that its validity is limited to systems showing a linear behaviour. New developments have thus been proposed in order to tackle nonlinear systems among which the theory based on the nonlinear normal modes is indubitably the most appealing. In this study, a different approach is adopted and the modes extracted from the proper orthogonal decomposition are considered for the characterization of nonlinear systems. [less ▲]

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See detailProposition d’une méthode de typologie hydro-géomorphologique des cours d’eau et tes sur un sous-bassin du Rhône (Bassin de l’Yzeron).
Schmitt, Laurent; Valette, L.; Valin, K. et al

in MOSELLA, XXIX (3-4) (2004)

Proposal of a method of hydro-geomorphological typology of rivers and test of a sub-basin of the Rhône River (Yzeron basin). The paper proposes a hydro-geomorphological typology method of watercourses ... [more ▼]

Proposal of a method of hydro-geomorphological typology of rivers and test of a sub-basin of the Rhône River (Yzeron basin). The paper proposes a hydro-geomorphological typology method of watercourses that might potentially be used in western Europe. The method was tested in the Yzeron basin (France). Field data were collected and analysed by multivariate statistics. Statistical results were consistent with the results of the typology model. Some recommendations are also made for the future development of automatic methods of characterization-sectorization of rivers. [less ▲]

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See detailSubcellular localization of the Bovine Leukemia Virus (BLV) R3 and G4 accessory proteins in BLV producing cells.
Dimitrov, P.; Russev, Russi; Shikova, E. et al

Poster (2004)

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See detailGeneration of digital surface models and orthophotos of urban areas with IKONOS stereopairs
Devriendt, Dennis; Goossens, Rudi; Binard, Marc ULg

(2004)

The purpose of the presented research project is to investigate how present-day EO-technology can support local and regional decision-making, particularly in Belgium, and to develop prototype versions of ... [more ▼]

The purpose of the presented research project is to investigate how present-day EO-technology can support local and regional decision-making, particularly in Belgium, and to develop prototype versions of value-added products that fulfill some of the actual information needs, as expressed by Belgian authorities at the local and at the regional level. One of the technical research modules is focussing on the geometrical aspects of VHR data processing. Due to the capability of the IKONOS sensor up to an angle of 26° off-nadir, the satellite can take stereo image pairs. An IKONOS stereo pair consists of two images of the same location taken from two different perspectives on the same orbital pass. Although it is possible to obtain a stereopair from two images from different orbital passes and with a large time interval, it is proved that the stereopairs ordered from Spaceimaging or resellers gives better results (2004, Taillieu et al.). This paper describes the method applied for DSM generation from an IKONOS stereopair, over an urban area. The geometrical accuracy of the DSM is compared with the accuracy of a DSM, derived from aerial photography at scales of 1:12000 and 1:4000. The satellite-derived DSM is used for ortho-rectification of VHR imagery. The accuracy of the ortho-rectified images is compared with ortho-rectifications of the same images, based on the aerial photo DSM. [less ▲]

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See detailInversion of the Biot-Savart Law: an approach based on discrete sine and cosine transforms
Dirickx, Michel; Denis, Samuel ULg; Vanderheyden, Benoît ULg et al

in Johansen, T. H.; Shantsev, D. V. (Eds.) Magneto-Optical Imaging, Proceedings of the NATO Advanced Research Workshop, held in Øystese, Norway, 28-30 August 2003 (2004)

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See detailAn attempt to derive a DEM and Ortho-photo map from hyperspectral data in the high resolution mode (Casi/SWIR)
Devriendt, Dennis; Goossens, Rudi; De Wulf, Alain et al

in Goossens, Rudi (Ed.) Remote Sensing in Transition (2004)

Future Remote Sensing data will include hyperspectral data more and more. This study frames in the preliminary studies to investigate the possibilities of these types of data. In this framework ... [more ▼]

Future Remote Sensing data will include hyperspectral data more and more. This study frames in the preliminary studies to investigate the possibilities of these types of data. In this framework experimental flights were organised by VITO (Flemish Institute for Technological Research) and OSTC (Federal Office for Scientific, Technical and Cultural Affairs) on 13th of September 2002 with a Dornier 228 aircraft carrying the CASI/SWIR sensor, over different test sites in Belgium. The flights were done by NERC and VITO and framed in the STEREO-program of OSTC. This paper deals with the “Ghent test site” over a peri-urban area, and focuses on the 3D-geometry of these data. These hyperspectral data are characterised by relief-displacement and differences in relief. These displacements occur in a direction away from the centre of the image. For remotely sensed images this is the direction away from the flight-line. In the monoscopic analysis of such images, these displacements will disturb the interpretation, the classification and the mapping of the image information. These distortions can be compensated for with a DEM. Very often this DEM has to come from an external data source such as laser scanning or aerial photography. However, when hyperspectral data is taken stereoscopically, it is possible to derive a DEM from these stereoscopic hyperspectral images, and so avoiding the cost to purchase an external DEM. To obtain stereoscopic imagery, two images were taken with an overlap of 80% in the so called “metrical mode” i.e. with a high spatial resolution (0.5m) and a lower spectral resolution. A third image was taken in “spectral mode”, for interpretation issues. A DEM and orthophoto were generated from the hyperspectral data by means of digital photogrammetry. A number of Ground Control Points were collected for absolute orientation, by means of DGPS. The geometric precision of the DEM and orthophoto derived from these data are evaluated using DEM and orthophoto derived from aerial pictures on different scales. [less ▲]

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See detailMédecine grecque et papyrologie : bilan et perspectives
Marganne, Marie-Hélène ULg

in Leclant, Jean; Jouanna, Jacques (Eds.) Actes du XIVe Colloque de la Villa grecque Kérylos "La Médecine grecque antique" organisé à Beaulieu-sur-mer, les 10 et 11 octobre 2003 (2004)

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See detailMale hypogonadism caused by insolated LH deficiency : From pathology to gene, from gene to physiology
Valdes Socin, Hernan Gonzalo ULg; Salvi, R.; Pralong, F. et al

in 12th International Congress of Endocrinology - Abstract book (2004)

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See detailEffects of interleukin-1 beta and dexamethasone on the expression by chondrocytes of antioxidant enzymes
Mathy, Marianne ULg; Devel, Philippe; Sanchez, Christelle ULg et al

in Osteoarthritis and Cartilage (2004), 12(Suppl. B), 51-52

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See detailActivator protein-1 activity in bronchial brushing samples from horses with recurrent airway obstruction
Couëtil, L.; Art, Tatiana ULg; Bureau, Fabrice ULg et al

in Proceedings of the 22nd Symposium of the Veterinary and Comparative Respiratory Society (2004)

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See detailMathematical modelling applied to caspase activation reveals a requirement for additional control
Eißing, T.; Conzelmann, H.; Gilles, E. D. et al

Poster (2004)

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See detailPrise en charge multimodale de la chirurgie abdominale majeure
Kaba, Abdourahmane ULg; Joris, Jean ULg

in La réhabilitation post-opératoire (2004)

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See detailLandscape metrics for the evaluation of trend reliability in remote sensing imagery.
Bogaert, Jan ULg

in Abstracts of the Second International SPOT/VEGETATION Users Conference (2004)

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See detailCharacterisation of thermophysical properties of semi-solid steels for thixoforming
Lecomte-Beckers, Jacqueline ULg; Rassili, Ahmed ULg; Carton, Marc ULg et al

in Proceedings of the 8th International Conference on Semi-Solid Processing of Alloys and Composites (S2P) (2004)

Major challenge for semi-solid processing includes broadening the range of alloys that can be successfully thixoformed and developing alloys specifically for thixoforming. One important parameter is ... [more ▼]

Major challenge for semi-solid processing includes broadening the range of alloys that can be successfully thixoformed and developing alloys specifically for thixoforming. One important parameter is appropriate solidus-liquidus interval. The wider the solidification interval, the wider the processing window. This study is related to the experimental determination of this critical parameter on eight different steel compositions. This parameter was obtained using Differential Scanning Calorimetry. This technique allows to obtain the solid fraction versus temperature. The paper also presents the results of thermophysical properties determination such as thermal diffusivity, heat capacity and thermal conductivity. These properties were measured from room temperature to semi-solid state in one particular steel. The thermal diffusivity was measured using the Laser Flash method and the heat capacity using a DSC calorimeter. The thermal conductivity was obtained by calculation knowing the thermal dilatation measured with a dilatometer. All these measurements were performed for temperatures up to the liquidus. These parameters are difficult to measure but they are important to determine for the conductive heating phase of a semi-solid forming (SSM) process. [less ▲]

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See detailUn sanctuaire thérapeutique du dieu lunaire Mên à Antioche de Pisidie
Nissen, Cécile ULg

in Musajo-Somma, Alfredo (Ed.) Actes du 39ème Congrès International d'Histoire de la Médecine : Bari-Metaponto, 5-10 September 2004, vol. I (2004)

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See detailSpectroscopic anatomy of a meteor with the Very Large Telescope (ESO)
Jehin, Emmanuel ULg; Jenniskens, P.; Laux, C. O. et al

in 35th COSPAR Scientific Assembly (2004)

A meteor spectrum in the range 637 - 1050 nm was recorded serendipitously at the ESO Very Large Telescope during a long exposure in long-slit spectroscopic mode with FORS1. The meteor crossed the narrow 1 ... [more ▼]

A meteor spectrum in the range 637 - 1050 nm was recorded serendipitously at the ESO Very Large Telescope during a long exposure in long-slit spectroscopic mode with FORS1. The meteor crossed the narrow 1" x 7' slit during normal service mode operation on May 12, 2002. To our knowledge, this is the first observation of a spatially resolved spectrum across a meteor trail. The trail is wider than expected and the plasma excitation temperature varies only from about 4,300 to 4,365 K across the trail, based on the ratio of atomic and molecular nitrogen emissions. The observed width could originate from a range of fragments that have spread significantly at the time of the observation. Finally, carbon atom emission is not detected in the relatively unexplored range above 900 nm. [less ▲]

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See detailStudy of the impact of satellite data assimilation into a hydrodynamical model of the ligurian sea. Comparison between sst fields and sst satellite-based predicted fields
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Rixen, M. et al

Conference (2004)

The verification of a 3D hydrodynamic model of the Ligurian Sea is presented. Two assimilation experiments have been carried out with this model: the assimilation of real SST, and the assimilation of SST ... [more ▼]

The verification of a 3D hydrodynamic model of the Ligurian Sea is presented. Two assimilation experiments have been carried out with this model: the assimilation of real SST, and the assimilation of SST forecasted by a statistical predictor. The aim of the study is to establish the skill of the model in these two configurations. The assimilation of predicted SST can help to increase the model skill when observations are not available, and preliminary results show that both approaches obtained similar results. The verification is done in a multi-scale approach, by decomposing the model results and the observations into several spatial scales, using 2D discrete wavelet transforms. At each scale the error between the model and the observations is calculated, and the scales where the biggest errors occur can be identified. The variability distribution of the model and the observations is also examined at each scale, to study the impact of the assimilation on the model variability. This methodology provides a scale-dependent insight in the study of the assimilation of SST and predicted SST. The differences between both assimilated data and how these differences affect the model results are examined. [less ▲]

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See detailSampling protocols and risk of error significance in molecular detection tests for fruit trees certification.
Kummert, Jean; Malice, Marie ULg; Marbot, Sophie et al

in Acta Horticulturae (2004), (657), 541-546

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See detailMeasurement of selected halogenated contaminants in human serum and milk using GCxGC-IDTOFMS
Focant, Jean-François ULg; sjodin, Andreas; Turner, Wayman et al

in Organohalogen Compounds (2004)

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See detailA new high-order high-frequency integral equation method for the solution of scattering problems. II. Multiple scattering configurations
Bruno, O.; Geuzaine, Christophe ULg; Reitich, F.

in Proceedings of the 20th Annual Review of Progress in Applied Computational Electromagnetics, ACES 2004 (2004)

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See detailDynamical behaviour of electro-mechanical coupled problem
Rochus, Véronique ULg; rixen, Daniel; Golinval, Jean-Claude ULg

Conference (2004)

MEMS are very small devices in which electric as well as mechanical dynamics phenomena appear. Because of the microscopic scale, some strong coupling effects between the different physical fields appear ... [more ▼]

MEMS are very small devices in which electric as well as mechanical dynamics phenomena appear. Because of the microscopic scale, some strong coupling effects between the different physical fields appear, and some forces, which are negligible at macroscopic scales, have to be taken into account. In order to make a good design of these micro-systems, it is important to analyse the coupling between the electrical and mechanical fields. This paper concerns the modelling of the strong electromechanical coupling appearing in micro-electro-mechanical systems (MEMS). The finite element method (FEM) is used to perform dynamical analysis taking into account large mesh displacements. Analysing the vibration of microsystems is a fundamental issues in the design of a broad range of sensors and actuators. The state of the art currently consists in using staggered procedures to compute quasi-static configurations based on the iteration between a structural model loaded by electrostatic forces and an electrostatic model defined on a domain following the deformation of the structure. Staggered iteration then leads to a static equilibrium position. Performing a perturbation analysis around the static equilibrium yields the electromechanical linearized stiffness needed for computing the eigenfrequencies. Obviously, performing the perturbation analysis to evaluate the tangent stiffness for every degree of freedom leads to very high computing costs and therefore onlythe tangent stiffness associated with presumed modes (typically some purely structural modes) are computed. Such a procedure can lead to important inaccuracies for designs where the electrostatic coupling is not quasi-uniform. In our work, we have developed a fully coupled electro-mechanical formulation that allows to find static equilibrium positions in a non-staggered way and which provides fully consistent tangent stiffness matrices for vibration analysis. The efficiency of the approach will be illustrated on modes of micro-electromechanical devices. The results obtained indicate that using this approach pull-in can be computed very accurately and at low computational cost. Also the coupled electromechanical modes obtained in the vicinity of equilibrium positions can be significantly different from the approximations obtained using a structural reduction at forehand. Numerical results are checked against analytical results where appropriate. The formulation developed for the strongly coupled electromechanical problem allows consistent vibration analysis of the system and yields more accurate vibration eigenmodes and frequencies than the classical staggered approaches. A second interest of the coupled tangent matrix is the computation of the dynamical behaviour of the coupled problem when we apply suddenly a voltage to the electrodes. Even under the pull-in voltage, the overshoot of the dynamical response may reduce the distance between the plate so that the electric force becomes dominant and the plates stick together. This phenomenon is called the dynamical pull-in. We will also treat it in this research. [less ▲]

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See detailData Assimilation in a Nested Model of the Gulf of Lions
Vandenbulcke, Luc ULg; Barth, Alexander ULg; Ben Bouallegue, Z. et al

Conference (2004)

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See detailBehavioural impact of food presentation: How to find an ideal number od weaned pigs per feeding place?
Laitat, Martine ULg; Vandenheede, Marc ULg; Desiron, Alain et al

in Kirkwood, J. K.; Roberts, E. A.; Vickery, S. (Eds.) Proceedings of the Universities Federation for Animal Welfare (2004)

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See detailPotential valorization for the finest particles of Automotive Shredder Residue (ASR) as filler in bituminous concrete
Bareel, Pierre-Francois; Courard, Luc ULg; Bastin, David ULg et al

in Proceedings of REWAS'04 - Global Symposium on Recycling, Waste Treatment and Clean Technology (2004)

Car manufacturers are faced with increasingly severe European regulations concerning End of Live Vehicles (ELV) recycling. Issues for the coarse fractions of Automotive Shredder Residue (ASR) are now ... [more ▼]

Car manufacturers are faced with increasingly severe European regulations concerning End of Live Vehicles (ELV) recycling. Issues for the coarse fractions of Automotive Shredder Residue (ASR) are now quite largely studied. However, the European objectives could only be achieved by considering the processing and valorization of the fine ASR fraction (< 2mm) which usually represents 5 to 10 wt.% of shredded ELV. A laboratory study was carried out on the fine ASR fraction. By combining granulometric, gravimetric and magnetic separations, four valorizable fractions were identified. This paper presents the valorization of the finest fraction (< 250 μm) as filler in bituminous concrete. Physical and chemical properties were first determined. Bituminous concrete samples were then prepared with different substitution levels of calcareous filler by fine ASR. Marshall tests (mechanical properties) and leaching tests were performed without compromising results. [less ▲]

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See detailMarble classification using scale spaces
Dislaire, Godefroid; Pirard, Eric ULg; Vanrell, Maria

in Prykryl, R. (Ed.) Dimension Stone (2004)

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See detailCorrespondences between the conception principles of sustainable public spaces and the criteria of outdoor comfort
Reiter, Sigrid ULg

in de Wit, M. H. (Ed.) Plea 2004 - Proceedings of the 21th International Conference on Passive and Low Energy Architecture (2004)

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See detailMonde sauvage et monde civilisé dans le mythe : le cas d'Orion
Renaud, Jean-Michel ULg

in Charpentier, Marie-Claude (Ed.) Les espaces du sauvage dans le monde antique. Approches et définitions (2004)

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See detailEglises liégeoises en chantier au XIIIe et au XIVe siècle
Hoffsummer, Patrick ULg; Tourneur, Francis; Eeckhout, Jérôme ULg et al

in Van den Bossche, Benoît (Ed.) La cathédrale gothique Saint-Lambert à Liège, une église et son contexte (2004)

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See detailThe impact of resistograph on tree decay
Toussaint, André ULg; Baudoin, Jean-Pierre ULg; Campanella, Bruno ULg et al

Conference (2004)

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See detailLe projet de plate-forme électronique de construction et de gestion qualité de tests standardisés e-C&QCST
Gilles, Jean-Luc ULg; Piette, Sylvie-Anne ULg; Detroz, Pascal ULg et al

in Arzola, S. (Ed.) World education for educational research (WAER) : XIV congreso mundial de ciencias de la educacion : educatores para una nueva cultura : summary of papers abstracts (2004)

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See detailDietary aspects of ruminal acidosis
Nguyen, Patrick; Dumon, Henri; Siliart, Brigitte et al

in Proceedings of the ACVIM Forum 2004 (2004)

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See detailEffect of elevated PCO2 on optical properties of the coccolithophorid Emiliania huxleyi grown under nitrate limitation
Denis, M.; Sciandra; Harlay, Jérôme ULg et al

in Cytometry. Part A : The Journal of the International Society for Analytical Cytology (2004), 59A(1), 105

Side scatter and red fluorescence properties of the coccolithophore Emiliania huxleyi were investigated by flow cytometry when NO3-limited continuous cultures were submitted to a CO2 partial pressure ... [more ▼]

Side scatter and red fluorescence properties of the coccolithophore Emiliania huxleyi were investigated by flow cytometry when NO3-limited continuous cultures were submitted to a CO2 partial pressure (pCO2) increase from 400 to 700 ppm. Cultures renewed at the rate of 0.5 d-1 and were submitted to saturating light level. pCO2 was controlled by bubbling CO2-rich or CO2- free air in the cultures. Most of the analyses were repeated 5 times and the average SD were < 1.6%, 0.1 and 0.2% for counting, fluorescence and side scatter respectively. Considering the possible decalcification induced by the increase of CO2 in the chemostat atmosphere, the maximum variation that can be expected for side scatter is that provided by the coccolith depletion upon acidification of the cell suspension. The acidification induced a large (36%) decrease of the side scatter signal but had no detectable effect on the red fluorescence. A control was run with a non-calcifying species, Dunaliella tertiolecta, where acidification induced no detectable change, both on fluorescence and side scatter. During the time of the experiment, the decline of side scatter in chemostat 1 never approached the potential 36% change observed when coccoliths are fully dissolved. Interestingly, the specific chl a fluorescence of E. huxleyi slightly increased during the period of high CO2 level. At the end of the experiment this increase amounted to a significant 2.8% of the initial signal. Furthermore, it progressed linearly with time over the period of observation. However, the experiment did not last enough to know if the fluorescence increase had already reached its maximum value. The acidification experiment supported the use of side scatter as a relevant parameter to trace potential changes in calcification. Since the estimated 25% decrease in calcification induced by the rise in CO2 atmosphere did not result in dramatic changes in side scatter values, we can conclude that the number of cocoliths and the overall shape and granulosity of cells was not significantly affected by this decrease. Changes must have only affected tiny structure details of the coccoliths which is supported by scanning electron microscopy observations. The small but significant increase of the fluorescence signal can be considered as a physiological response to the CO2 rise. This suggests a more dynamic photosynthetic process that would result in a higher rate of organic matter production providing that the system is not nutrient limited as in the present situation. [less ▲]

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See detailMesoscopic model of intergranular cracks in low carbon steel during cooling of continuous casting
Castagne, S.; Pascon, Frédéric ULg; Lecomte-Beckers, Jacqueline ULg et al

in Lamberigts, M. (Ed.) Proceedings of the 2nd international conference of thermomechanical processing of steels (TMP 2004) (2004)

This paper addresses the problem of transverse cracking during the continuous casting of low carbon steel. The damage mechanisms occurring at high temperature during this process are identified and a ... [more ▼]

This paper addresses the problem of transverse cracking during the continuous casting of low carbon steel. The damage mechanisms occurring at high temperature during this process are identified and a numerical approach for the modelling of these phenomena at the grain scale is proposed. Experiments allowing the identification of the model’s parameters are described. Finally, the first results obtained with the model are presented. [less ▲]

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See detailThe nitrogen isotope ratio in a few Oort Cloud comets
Jehin, Emmanuel ULg; Arpigny, Claude ULg; Manfroid, Jean ULg et al

in 35th COSPAR Scientific Assembly (2004)

In the past few years, high-resolution (R ˜ 70,000) and high quality spectra of the CN B^2Sigma^+ - X^2Sigma^+ (0,0) band (at 388 nm) of several Oort Could comets have been collected by our team in ... [more ▼]

In the past few years, high-resolution (R ˜ 70,000) and high quality spectra of the CN B^2Sigma^+ - X^2Sigma^+ (0,0) band (at 388 nm) of several Oort Could comets have been collected by our team in different observatories and have allowed the first optical detections of [SUP]12[/SUP]C[SUP]15[/SUP]N. Observations with first class spectrographs on large 8m telescopes, such as UVES at the ESO VLT, have shown that such very efficient equipment are able to provide isotopic ratios for comets as faint as m_r ˜ 9 (heliocentric magnitude), opening up the possibility of carrying out a systematic analysis over a significant sample of comets. While the measured [SUP]12[/SUP]C/[SUP]13[/SUP]C isotope ratios in the different comets are in good agreement with the Solar system value (89), the derived [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios are only about half the value in Earth's atmosphere (272), indicating an excess of [SUP]15[/SUP]N by a factor of about 2 with respect to the "cosmic" value. It is striking to note that the optical determinations of [SUP]14[/SUP]N/[SUP]15[/SUP]N in the different comets are consistent with each other (140 � 30), but not with the ratios derived for comet Hale-Bopp from sub-millimeter measurements on HCN, generally believed to be the main parent of CN. This discrepancy could indicate the existence of (an) other unknown parent(s) of CN, with an even higher [SUP]15[/SUP]N excess. Organic compounds like those found in interplanetary dust particles (IDPs) are good candidates. Further determinations from HCN are now badly needed in other comets. Obtaining the value of the N isotopic ratio in Jupiter-family short-period comets would be of great significance in view of their presumed different place of birth. Much is also expected in this respect, as in many others, from several space missions such as Deep Impact, Stardust, and Rosetta. [less ▲]

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See detailLa réduction chirurgicale de la masse tumorale des adénomes hypophysaires améliore le contrôle médical de l'acromégalie par les analogues de la Somatostatine
Petrossians, Patrick ULg; Borges-Martins, L.; Espinoza, C. et al

in XXIème Congrès de la Société Française d'Endocrinologie - Abstract book (2004)

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See detailCadmium-induced oxidative stress and lung emphysema in rats
Kirschvink, Nathalie; Delvaux, F.; Vincke, G. et al

in Prostaglandins, Leukotrienes, and Essential Fatty Acids (2004), 71

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See detailElaboration d’une typologie hydro-géomorphologique de cours d’eau dans l’Euregio Meuse-Rhin
Hallot, Eric ULg; Schmitt, L.; Mols, J. et al

in Mosella - XXIX, 3-4 (2004)

This paper shows the first results of a method of river hydro-geomorphological typology applied on the Euregio Maas-Rhine. This is based on non factorial multivariate analysis (clusters) of only ... [more ▼]

This paper shows the first results of a method of river hydro-geomorphological typology applied on the Euregio Maas-Rhine. This is based on non factorial multivariate analysis (clusters) of only quantitative data automatically extracted from DEM or obtained by field measurements with a simplified protocol. The regional differentiation of variables allows the automatic characterization of rivers especially with the specific stream power. [less ▲]

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See detailUse of heterologous and homologous radioimmunoassay (RIA) for ovine pregnancy-associated glycoprotein (ovPAG) determination to detect pregnancy in sheep
Vandaele, L.; Verberckmoes, S.; De Cat, S. et al

in Reproduction (Cambridge, England). Abstract Series (2004), 31

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See detailAffections respiratoires bovines : évolution des lésions pulmonaires et rapidité d’intervention
Lekeux, Pierre ULg; Coghe, J.

in Proceedings: Congrès de la Société Française de Buiatrie (2004)

Respiratory disease is the principal cause of loss of young cattle worldwide. The syndrome arises from a number of factors, including those involving the animal, e.g., age, general condition and immune ... [more ▼]

Respiratory disease is the principal cause of loss of young cattle worldwide. The syndrome arises from a number of factors, including those involving the animal, e.g., age, general condition and immune status; its environment, e.g., changes in food, temperature and humidity that lead to stress; and the presence of infectious agents, e.g., bacteria, viruses and mycoplasmas. The syndrome, in a method proposed by the author, can be classified into four grades: Grade 1, subclinical disease; Grade 2, compensated clinical disease; Grade 3, noncompensated clinical disease; and Grade 4, irreversible clinical disease. The increase in frequency and economic impact of bovine respiratory disease complex can be correlated with the escalating industrialisation of cattle production. In intensive operations, commingling of animals from multiple sources, exposure to many organisms, stress and management practices are all factors that can lead to disease. The predisposition of cattle, especially beef calves, to respiratory problems is related to their lack of functional pulmonary hardiness. Selection of breeds that demonstrate adequate pulmonary function and sufficient ventilatory reserve may help in the control of the bovine respiratory disease complex, but this approach is difficult to implement and slow to produce results. Prophylactic measures, including vaccination programmes and modifying management practices to reduce stress, also have a place in preventing the bovine respiratory disease complex. Unfortunately, these measures are not always easy to put into operation and cannot completely eradicate the problem. Therapeutic strategies to minimise the economic impact of the syndrome include use of early antibacterial therapy, modulation of the pulmonary inflammatory reaction and correction of mechanical disorders [less ▲]

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See detailLaboratory investigation of inlays and surface treatments for the decoration of copper based alloy objects from the imperial roman period
Mathis, François ULg; Descamps, Sophie; Robcis, Dominique et al

in 34th INTERNATIONAL SYMPOSIUM ON ARCHAEOMETRY (2004)

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See detailLandscape ecology: focus on spatio-temporal patterns.
Bogaert, Jan ULg

Conference (2004)

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See detailIntégration numérique de fonctions singulières introduites par la méthode X-FEM pour la fissuration
Minnebo, Hans; Béchet, Eric ULg; Moës, Nicolas et al

Conference (2004)

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See detailEnterotoxaemia in foods animals
Linden, A.; Manteca, C.; Daube, G. et al

Conference (2004)

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See detailRadioimmunoassay of bovine placental lactogen (bPL) using an antiserum raised in guinea pigs: measurement in foetal plasma
Alvarez-Oxiley, A. V.; Melo de Sousa, Noelita ULg; Touati, Kamal ULg et al

in Reproduction (Cambridge, England). Abstract Series (2004), 31

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See detailAnalysis of glucosinolates and their breakdown compounds
Wathelet, Jean-Paul ULg

Conference (2004)

Glucosinolates are a class of ca. 120 secondary plant metabolites generally found in Brassicaceae. These compounds have a similar structure characterised by a common part containing a beta thioglucose ... [more ▼]

Glucosinolates are a class of ca. 120 secondary plant metabolites generally found in Brassicaceae. These compounds have a similar structure characterised by a common part containing a beta thioglucose coupled with a sulfonated oxim group and by a variable organic side chain constituted with alkyl, alcenyl, hydroxy-alcenyl, aryl, indolyl, sulfinyl, sulfonyl or thio residues. Present in high or low level (00 varieties) in rapeseed/canola seeds and in rapeseed/canola meals, these molecules are easily broken down during animal digestion, leading to compounds with detrimental and antinutritional characteristics. They are known to interfere with the thyroid and to damage vital organs (Fenwick et al., 1983). [less ▲]

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See detailGaseous emissions in the raising of weaned pigs on fully slatted floor or on straw-bases deep litter
Nicks, Baudouin ULg; Laitat, Martine ULg; Farnir, Frédéric ULg et al

in Clement, G.; Madec, F. (Eds.) Proceedings of the in- between congress of the International Society for Animal Hygiene (2004)

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See detailBootstrap and the parameters of pion nucleon resonances
Semenov-Tyan-Shanskiy, Kirill ULg; Vereshagin, Alexander; Vereshagin, Vladimir

in AIP Conference Proceedings (2004), 717

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See detailImproved separation of the 209 PCBs using GCxGC-TOFMS
Focant, Jean-François ULg; Sjödin, Andreas; Patterson, Donald G.

in Organohalogen Compounds (2004), 66

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See detailLlandovery biostratigraphy of the Paraná Basin, East Paraguay
Mendlowicz Mauller, P.; Pereira, E.; Grahn, Y. et al

Conference (2004)

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See detailConvergence and conditionning issues with X-FEM in fracture mechanics
Béchet, Eric ULg; Minnebo, Hans; Moës, Nicolas

in Computational Mechanics (2004)

Numerical crack propagation schemes were augmented in an elegant manner by the X-FEM method applied to fracture mechanics. The use of special tip enrichment functions, as well as a discontinuous function ... [more ▼]

Numerical crack propagation schemes were augmented in an elegant manner by the X-FEM method applied to fracture mechanics. The use of special tip enrichment functions, as well as a discontinuous function along the sides of the crack allows one to do a complete crack analysis virtually without modifying the underlying mesh, which is of an evident industrial interest. The conventional approach for crack tip enrichment (described in [2,3]) is that only a specific layer of elements are enriched around the crack tip. We show that this “topological” approach does not yield an increase of the order of the asymptotic convergence rate when compared to unenriched finite elements, as when the crack is part of the mesh. It rather modifies the proportionality factor of the asymptotic convergence rate. In this study, we propose another enrichment scheme which yields a convergence rate that appears to be close to that of regular finite elements used when the solution field does not show singularities. The enriched basis in X-FEM degrades the rigidity and mass matrices condition numbers (the mass matrix typically appears in case of time dependent problems such as wave propagation in cracked bodies). To recover the condition number of non enriched matrices, we introduce a preconditioning strategy which acts block-wise on the set of enriched degrees of freedom associated to each node. This strategy uses a local (nodal) Cholesky based decomposition. Another issue is brought by the integration scheme used to build the matrices. The nature of the asymptotic functions are such that any Gauss-Legendre based integration scheme will only poorly converge with respect of the order of the quadrature. We propose a modified integration scheme to handle that issue. We apply the new technique developed to the estimation of stress intensity factors along the crack front of 3D cracks and use these SIFs for crack propagation using a Paris type fatigue law. [less ▲]

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See detailEffect of number of lambs, their sex and birth weignt on ovine pregnancy associated glycoprotein (ovPAG) concentrations
Vandaele, L; Verberckmoes, S; De Cat, S et al

in Journal of Reproduction & Fertility. Abstract Series (2004), 16(2), 192193

Early pregnancy detection and prediction of the number of lambs would be profitable for sheep breeders, as this enables nourishment of pregnant ewes to their individual needs. Nonpregnant ewes can be ... [more ▼]

Early pregnancy detection and prediction of the number of lambs would be profitable for sheep breeders, as this enables nourishment of pregnant ewes to their individual needs. Nonpregnant ewes can be separated and sold before winter. Prediction of sex is interesting for the curiosity of impatient breeders. Early pregnancy detection (before 45 days after mating) by means of ovine pregnancy-associated glycoproteins (ovPAGs) has proved to be a more reliable test than the commonly used transrectal ultrasound. The concentration of ovPAG has been claimed to be related to the number of lambs, their sex and birth weight, but contradictory results were obtained in different small-scale studies. In this study the correlation between number of lambs, their sex and birth weight and the ovPAG concentration in the serum of the ewes was examined. In a field trial, 160 and 70 ewes of the Texel and Suffolk breed, respectively, housed on 6 different farms, were synchronized by means of intravaginal sponges impregnated with 40 mg cronolone (Chronogest®, Intervet, Boxmeer, The Netherlands). At the moment of synchronisation (T0) and at 25 (T25), 35 (T35) and 45 (T45) days after mating or artificial insemination, blood samples were taken by jugular vein puncture. A heterologous radioimmunoassay (RIA) was used to determine the ovPAG concentration. In the heterologous RIA boPAG molecules were used as tracer, and ovPAG molecules as standard, while rabbit antibodies against ovPAG were used as antiserum. At parturition, number, sex and birth weight of the lambs were registered and their effect on ovPAG concentrations was statistically evaluated. No significant difference in ovPAG concentration was found between ewes pregnant of a single male or female lamb (P = 0.29). ovPAG concentrations were affected by the total birth weight (P < 0.05). In ewes pregnant with multiples, the ovPAG concentrations were higher (P < 0.01) than in ewes pregnant with singles at T25, T35 and T45, respectively. Because ovPAG concentrations were affected by the farm, it was impossible to predict the number of lambs by the ovPAG level. In conclusion, ovPAG concentrations were not affected by the sex of the lamb. However, ovPAG concentrations were related to the total birth weight. Within the farm, increased ovPAG concentrations may indicate pregnancy of multiples. [less ▲]

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See detailInvestigating relationships between Landsat ETM+ data and LAI in a semi-arid grassland of northwest China
Lu, L; Li, X; Ma, M G et al

in Geoscience and Remote Sensing Symposium, 2004. Proceedings IGARSS '04. (2004)

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See detailIsolation and characterisation of seven alien monosomic addition lines of Gossypium australe F. Muell. on G. hirsutum L.
Ahoton, L.; Lacape, J. M.; D'Hont, A. et al

in World Cotton Research Conference - 3. Cotton production for the new Millenium (2004)

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See detailLe non-lieu de l'exil dans le cinéma de Belgique francophone
Mélon, Marc-Emmanuel ULg

in Bajomée, Danielle; Mabrour, Abdelouahed (Eds.) Exils imaginaires et exils réels dans le domaine francophone. Théorie, histoire, figures, pratiques (2004)

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See detailBootstrap Equations for String-Like Amplitude
Semenov-Tyan-Shanskiy, Kirill ULg

in Dubinin, M.; Savrin, V. (Eds.) High energy physics and quantum field theory. Proceedings, 18th International Workshop, QFTHEP 2004, St. Petersburg, Russia, June 17-23, 2004 (2004)

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See detailStratégie régionale de gestion de l’activité cynégétique en périphérie du parc du W (Bénin, Burkina Faso, Niger)
Boulet, H.; Vermeulen, Cédric ULg; Aladji-Boni, A. S. et al

in Game and Wildlife Science (2004), 21(3), 663-673

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See detailInfluence of selenium enriched fertilizers on the selenium content in grass and the selenium status in a suckling herd offered selenium enriched grass, silage and barley
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in Book of Abstracts of the 55th Annual Meeting of the European Association for Animal Production (2004)

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See detailReconstruction of missing data in geophysical fields. resolution of moving patterns
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Rixen, M. et al

Conference (2004)

A method for the reconstruction of missing data in large data sets is presented. The method, DINEOF (Data INterpolating Empirical Orthogonal Functions), calculates the missing data from an optimal number ... [more ▼]

A method for the reconstruction of missing data in large data sets is presented. The method, DINEOF (Data INterpolating Empirical Orthogonal Functions), calculates the missing data from an optimal number of EOFs determined by cross-validation. A Lanczos method has been used for the EOF decomposition, in order to work with large matrices. DINEOF has been applied to two data sets of sea surface temperature: a set of 105 images in the Adriatic Sea and a set of 216 images in Tanganyika Lake. These data sets present 52% and 37% of missing data respectively, due to cloud coverage. Several validation studies have been carried out: comparison with in situ data and reconstruction of increasing amounts of missing data, from 40% to 80% of the total data, by artificially adding clouds. All tests show that results are robust. DINEOF uses a classical EOF decomposition. In this work we also present a different EOF decomposition, known as Extended EOF (ExEOF) or Singular Spectrum Analysis (SSA). This technique consists in using a lagged version of the matrix being analysed. By taking into account both the spatial and temporal correlation of the data, the ExEOF technique resolves spatio-temporal moving patterns in a more accurate way. Preliminary results show that this technique helps to better reconstruct the missing data in our data sets. [less ▲]

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See detailInfluence of the section and of the insulation type of the equivalent time
Cadorin, Jean-François; Pérez Jiménez, C.; Franssen, Jean-Marc ULg

in Bradley, D. (Ed.) Proceedings of the 4th International Seminar Fire and Explosion Hazards (2004)

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See detailLaparoscopic sigmoidectomy for fistulized diverticulitis
Laurent, S; DETROZ, Bernard ULg; DETRY, Olivier ULg et al

in Acta Gastro-Enterologica Belgica (2004), 67

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See detailLe nimbe et le jurème
Brausch, Géraldine ULg

in Brausch, Géraldine; Delruelle, Edouard (Eds.) La droit sans la justice : Actes de la rencontre autour du 'Cap des tempêtes' de L. François (2004)

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See detailAnalyse explicative des influences observables de la reconnaissance et de la validation des compétences : le cas du PMTIC.
Pierrard, Jean-François; Brundseaux, Marie-France ULg; Georges, François ULg et al

in L'évaluation des compétences: entre reconnaissance et validation des acquis de l'expérience (2004)

L’article présente une réflexion théorique argumentée sur le manque de justifications empiriquement fondées de la mise en place de la reconnaissance et de la Validation des Acquis de l’Expérience et sur ... [more ▼]

L’article présente une réflexion théorique argumentée sur le manque de justifications empiriquement fondées de la mise en place de la reconnaissance et de la Validation des Acquis de l’Expérience et sur les effets observables que celle-ci est censée avoir sur tous ceux et toutes celles qui en bénéficient. Pour étoffer la réflexion théorique, l’article présente, en outre, les résultats provisoires d’une étude de terrain réalisée, en Belgique francophone, sur les acteurs du Plan Mobilisateur aux Technologies de l’Information et de la Communication (PMTIC) ; acteurs qui reçoivent, chacun à leur échelon, la reconnaissance et la validation de leurs compétences par l’acteur de l’échelon supérieur. [less ▲]

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See detailLa Femme et le cloître à l’époque moderne. Bilan historiographique et perspectives de recherches
Henneau, Marie-Elisabeth ULg

in Leduc, Guyonne (Ed.) Nouvelles sources et nouvelles méthodologies de recherche dans les études sur les femmes (2004)

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See detailA generic approach for image classification based on decision tree ensembles and local sub-windows
Marée, Raphaël ULg; Geurts, Pierre ULg; Piater, Justus ULg et al

in Proceedings of the 6th Asian Conference on Computer Vision (2004)

A novel and generic approach for image classification is presented. The method operates directly on pixel values and does not require feature extraction. It combines a simple local sub-window extraction ... [more ▼]

A novel and generic approach for image classification is presented. The method operates directly on pixel values and does not require feature extraction. It combines a simple local sub-window extraction technique with induction of ensembles of extremely randomized decision trees. We report results on four well known and publicly available datasets corresponding to representative applications of image classification problems: handwritten digits (MNIST), faces (ORL), 3D objects (COIL-100), and textures (OUTEX). A comparison with studies from the computer vision literature shows that our method is competitive with the state of the art, an interesting result considering its generality and conceptual simplicity. Further experiments are carried out on the COIL-100 dataset to evaluate the robustness of the learned models to rotation, scaling, or occlusion of test images. These preliminary results are very encouraging [less ▲]

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See detailHpatitis C infection: eligibility for antiviral therapies
El souda, R; DELWAIDE, Jean ULg; GERARD, Christiane ULg et al

in Acta Gastro-Enterologica Belgica (2004), 67

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See detailImmunology of dermatophytosis
Mignon, Bernard ULg; Vermout, S.; Tabart, J. et al

Conference (2004)

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See detailNEO 2003 EH_1, the Quadrantid Shower Parent
Jenniskens, P.; Lyytinen, E.; Jehin, Emmanuel ULg et al

in 35th COSPAR Scientific Assembly (2004)

Near Earth Object 2003 EH_1, first seen by LONEOS on 2003 March 6, was identified in early December as the parent of the Quadrantid shower based on the orbit calculated from 48 days of observations ... [more ▼]

Near Earth Object 2003 EH_1, first seen by LONEOS on 2003 March 6, was identified in early December as the parent of the Quadrantid shower based on the orbit calculated from 48 days of observations following its discovery [1]. The Quadrantids is our most intense annual shower and was until now the only major shower with no parent body. The orbit matches the inclination, semi-major axis, and argument of perihelion of the Quadrantid meteoroids, but has a perihelion distance outside of Earth orbit. It was shown that frequent close encounters with Jupiter result in a rapid dispersion of perihelion distances, accounting for the current orbit of the parent body. The dispersion of orbits in the meteor shower implies a young ˜ 500 year age and the large mass in the stream suggests formation during a comet breakup. This leaves open the possibility that comet C/1490 Y1 was a sighting of the object shortly after it broke up near aphelion, but to match the perihelion time with that of the backward integrated orbit of 2003 EH_1, a better orbit solution is needed. In December and January of 2003, we recovered the object with the ESO New Technology Telescope and computed a much improved orbit. We used that new orbit to study the formation of the Quadrantid stream for various epochs of ejection. In the context of evaluating the NEO impact hazard, those meteoroids trace the orbital evolution of other possible fragments from the breakup 500 years ago that may now be on a collision course with Earth. [1] P. Jenniskens, B.G. Marsden (2003) IAU Circular 8252 - December 08, 2003 (D.W.E. Green, ed.); P. Jenniskens (2004) 2003 EH_1 is the Quadrantid shower parent comet. Astronomical Journal (in press); http://leonid.arc.nasa.gov [less ▲]

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See detailRecombination and somatic elimination of a Gossypium australe chromosome in G. hirsutum
Sarr, D.; Baudoin, Jean-Pierre ULg; Mergeai, Guy ULg

in Proceedings of the Beltwide cotton improvement conference (2004)

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See detailDevelopment of Space Weather related services for real time GPS applications in the frame of the SIDC Space Weather Pilot Project
Warnant, René ULg; Bavier, Michaël; Lejeune, Sandrine et al

Conference (2004)

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See detailOperation rules determined by risk analysis for special protection systems at Hydro-Québec
Huang, Jinan; Vanier, Guy; Valette, Alain et al

(2004)

This paper describes a new approach used by Hydro-Québec to determine the rules of automatic devices installed in its main power plants to maintain secure operation under extreme contingencies. An example ... [more ▼]

This paper describes a new approach used by Hydro-Québec to determine the rules of automatic devices installed in its main power plants to maintain secure operation under extreme contingencies. An example of application of this approach is given to illustrate how to apply data mining technique for the rules of the automatic generator rejection and remote load shedding system (RPTC: Rejet de Production et Télédélestage de Charges in French) installed at the Churchill Falls hydroelectric power plant (5500 MW) in Labrador. Real time snapshots of the Hydro-Québec power system collected over several years data have been used to generate large amounts of results (database) by transient stability simulations. The database is processed by the data mining software developed by the University of Liege to construct the decision trees. This approach gives the most relevant parameters and finds optimal settings for the RPTC system at the Churchill Falls, minimizing the number of generator rejection while maintaining the same performance in terms of security coverage. New operation rules have thus been established. [less ▲]

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See detailStrontium ranelate reduces the risk of vertebral and non-vertebral fractures in Caucasian women with post-menopausal osteoporosis.
Adami, S; Meunier, J; Devogelaer, JP et al

in Calcified Tissue International (2004), 74(S1), 37-38

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See detailBiological control of storage rots on apple by postharvest treatment with NEX0101
Creemers, P.; Van Laer, S.; Dickburt, C. et al

Conference (2004)

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See detailIsolation and characterisation of new alien monosomic addition lines of Gossypium australe F. Muell. on G. hirsutum L.
Mergeai, Guy ULg; Sarr, D.; Ahoton, L. et al

in Proceedings of the 2004 International cotton initiative workshop (2004)

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See detailNash equilibria and reinforcement learning for active decision maker modelling in power markets
Krause, Thilo; Andersson, Goran; Ernst, Damien ULg et al

in Proceedings of the 6th IAEE European Conference: Modelling in Energy Economics and Policy (2004)

In this paper, we study the behavior of power suppliers who submit their bids to the market place in order to maximize their payoffs. The market clearing mechanism is based on the locational marginal ... [more ▼]

In this paper, we study the behavior of power suppliers who submit their bids to the market place in order to maximize their payoffs. The market clearing mechanism is based on the locational marginal price. To study the interaction of the power suppliers, we rely on two different approaches and compare the results obtained. One approach consists of computing the Nash equilibria of the market, and the other models each player’s behavior by using reinforcement learning algorithms. Simulations are carried out on a five node power system. [less ▲]

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See detailAn immunohistochemical study of eosinophilic bronchopneumopathy in dogs.
Peeters, Dominique ULg; Day, M. J.; Clercx, Cécile ULg

in Proceedings of the 14th Annual Congress of the ECVIM-CA (2004)

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See detailShould the safety and ethical evaluation of GMOs be based on the process or on the product of the novel gene combination?
du Jardin, Patrick ULg

in du Jardin, Patrick (Ed.) Science, Ethics & Society - 5th Congress of the European Society for Agricultural and Food Ethics (2004)

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See detailRenormalization programme for effective theories
Vereshagin, Vladimir; Semenov-Tyan-Shanskiy, Kirill ULg; Vereshagin, Alexander

in Lipatov, L.; Kim, V. (Eds.) Proceedings of First International Workshop, Hadron Structure and QCD, from low to high energies, Repino, St. Petersburg, Russia, 18-22 May 2004 (2004)

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See detailLingopti project: semi-continuous casting process of copper-nickel alloys
Pecquet, Etienne ULg; Volles, Ralf; Lecomte-Beckers, Jacqueline ULg et al

in Proceedings of the 21st International Congress of Theoritical and Applied Mechanics (2004)

The following text deals with casting of copper-nickel alloys. They are high added values materials. The research contains two main parts. Laboratory tests (completed with bibliography) that provide ... [more ▼]

The following text deals with casting of copper-nickel alloys. They are high added values materials. The research contains two main parts. Laboratory tests (completed with bibliography) that provide thermal and mechanical properties of the ingot and the mould but also heat transfer coefficients between the ingot and its environment (mould, air and water). These parameters are required in the second part : development and validation of numerical modelization by the finite element method to optimise the industrial process. [less ▲]

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