References of "Scientific congresses and symposiums"
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See detailLes réseaux dans le théâtre belge contemporain
Delhalle, Nancy ULg

Conference (2003, March 21)

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See detailAnalyse de deux études dans l'hypertension artérielle : ALLAT et ABPBN2
Krzesinski, Jean-Marie ULg

Conference (2003, March 20)

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See detailHydrodynamic and hydrodispersive behaviour of variably saturated chalk : a field investigation
Brouyère, Serge ULg

Conference (2003, March 19)

The presentation described field investigations on contaminant transport across unsaturated chalk rocks, including tracer tests

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See detailDesign of the cryo-optical test of the PLANCK reflectors
Roose, Stéphane ULg; Cucchiaro, Antonio ULg; De Chambure, Daniel

Conference (2003, March 18)

PLANCK is the third Medium size mission of the ESA long-term scientific plan Horizon 2000. This paper present the current design status of the design of the cryo-optical test for the Planck primary ... [more ▼]

PLANCK is the third Medium size mission of the ESA long-term scientific plan Horizon 2000. This paper present the current design status of the design of the cryo-optical test for the Planck primary reflector and Planck secondary reflector [less ▲]

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See detailL'orgie ou la boucle du temps dans le film noir hollywoodien
Tomasovic, Dick ULg

Conference (2003, March 17)

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See detailLes épilepsies : de la molécule aux symptômes
Martin, Didier ULg

Conference (2003, March 15)

Detailed reference viewed: 6 (0 ULg)
See detailAntiplasmodial and cytotoxic alkaloids from Strychnos species
Frederich, Michel ULg

Conference (2003, March 14)

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See detailApprentissage lexical et généralisation chez les enfants retardés mentaux
Elbouz, Mouna; Comblain, Annick ULg; Thibaut, Jean-Pierre

Conference (2003, March 14)

Pour de nombreux aspects du développement lexical, des données concernant les enfants retardés mentaux de diverses étiologies sont disponibles, la plus étudiée étant la personne trisomique 21. On a ainsi ... [more ▼]

Pour de nombreux aspects du développement lexical, des données concernant les enfants retardés mentaux de diverses étiologies sont disponibles, la plus étudiée étant la personne trisomique 21. On a ainsi montré que les enfants normaux et retardés mentaux acquièrent les mêmes premiers lexèmes et relations sémantiques, qu’ils appliquent les mêmes stratégies d’acquisition de nouveaux mots, qu’ils montrent les mêmes effets de prototypie dans les tâches lexicales et manifestent des effets de priming sémantique. [less ▲]

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See detailHydrodynamic and hydrodispersive behaviour of chalk under variably saturated conditions
Brouyère, Serge ULg

Conference (2003, March 11)

The presentation describes a conceptual and mathematical model for solute migration in variably saturated fractured dual porosity, dual permeability chalk

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See detailLes auteurs classiques et les écritures égyptiennes: Questions de terminologie
Winand, Jean ULg

Conference (2003, March 07)

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See detailCometary Organic Macromolecules in Interplanetary Dust Particles?
Aléon, J.; Arpigny, Claude ULg; Robert, F. et al

in Lunar and Planetary Institute Science Conference Abstracts 34 (2003, March 01)

Based on the determination of N concentrations in D-rich molecules in IDPs and new 14N/15N ratios in comets, it is proposed here that organic chemistry of IDPs may provide a direct link with comets.

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See detailThe Darwin Ground-based European Nulling Interferometry Experiment
Gondoin, P.; Absil, Olivier ULg; Fridlund, M. et al

in Lacoste, H. (Ed.) GENIE - DARWIN Workshop - Hunting for Planets (2003, March 01)

Darwin is one of the most challenging space pro jects ever considered by the European Space Agency (ESA). Its principal ob jectives are to detect Earth-like planets around nearby stars and to characterise ... [more ▼]

Darwin is one of the most challenging space pro jects ever considered by the European Space Agency (ESA). Its principal ob jectives are to detect Earth-like planets around nearby stars and to characterise their atmospheres. Darwin is conceived as a space nulling interferometer" which makes use of on-axis destructive interferences to extinguish the stellar light while keeping the o -axis signal of the orbiting planet. Within the frame of the Darwin program, the European Space Agency (ESA) and the European Southern Observatory (ESO) intend to build a ground-based technology demonstrator called GENIE (Ground based European Nulling Interferometry Experiment). Such a ground-based demonstrator built around the Very Large Telescope Interferometer (VLTI) in Paranal will test some of the key technologies required for the Darwin Infrared Space Interferometer. It will demonstrate that nulling interferometry can be achieved in a broad mid-IR band as a precursor to the next phase of the Darwin program. The present paper will describe the ob jectives and the status of the project. [less ▲]

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See detailConfigurations and Modulation Schemes Trade-off
Absil, Olivier ULg

in Lacoste, H. (Ed.) GENIE - DARWIN Workshop - Hunting for Planets (2003, March)

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 subsystems. 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 detailAnalysis of selected halogenated contaminants using SBSE-TD-PTV-GCxGC-IDTOFMS
Focant, Jean-François ULg; Sjodin; Needham et al

Poster (2003, March)

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See detailCombined implicit/explicit time integration algorithms for crashworthiness analysis and metal forming simulation
Noels, Ludovic ULg; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

in Proceedings of IMPLAST'2003, 8th International Symposium on Plasticity and Impact Mechanics (2003, March)

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See detailOptimal Pump Scheduling for Water Supply Using Genetic Algorithms
Kelner, Vincent ULg; Léonard, Olivier ULg

in Proceedings od Eurogen'03 (2003, March)

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See detailOn-Line Measurement Validation and Performance Monitoring Using Robust Kalman Filtering Techniques
Dewallef, Pierre ULg; Léonard, Olivier ULg

in 5th European Conference on Turbomachinery - Fluid Dynamics and Thermodynamics - Conference Proceedings (2003, March)

In an on-line engine performance monitoring, two tasks must be simultaneously carried out: an on-line engine health parameter estimation and an on-line engine state variables estimation. Estimation of the ... [more ▼]

In an on-line engine performance monitoring, two tasks must be simultaneously carried out: an on-line engine health parameter estimation and an on-line engine state variables estimation. Estimation of the state variables constitutes a general application of the Extended Kalman Filter theory, while the health parameter estimation is a classical recurrent regression problem. Recent advances show that both problems can be solved by two Kalman filters working jointly. Such filters are usually named Dual Kalman Filters. The present contribution aims at using a modified dual Kalman filter to provide robustness. This procedure should be able to cope with as much as 20 to 30% of faulty data. The resulting on-line validation method has been applied to a turbofan model developed in the frame of the OBIDICOTE 1 project. Several tests have been carried out to check the performance monitoring capability and the robustness that can be achieved [less ▲]

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See detailFDC-B1, a new monoclonal antibody directed against bovine follicular dendrititic cells.
Defaweux, Valérie ULg; Mélot, France ULg; Jolois, Olivier ULg et al

Poster (2003, March)

Follicular dendritic cells (FDCs) are unique immunological accessory cells located in the light and dark zones of the germinal centres in lymph follicles. Characterized by long branching processes forming ... [more ▼]

Follicular dendritic cells (FDCs) are unique immunological accessory cells located in the light and dark zones of the germinal centres in lymph follicles. Characterized by long branching processes forming a three-dimensional network, FDCs create particular microenvironments for germinal centre B and T cells and contribute to the maturation of B cells into memory cells. An involvement of the FDCs is suspected in various disorders affecting lymphoid tissues, malignant lymphoma or in some viral diseases. Moreover, in prion diseases, FDCs seem to be the major sites of extraneuronal cellular prion protein expression and the principal sites of the infectious agent accumulation in lymph organs. Because no antibody commercially available was specific to bovine FDCs, a new monoclonal antibody directed against bovine FDCs (FDC-B1) has been produced and characterized in our laboratory. The antigen detected by FDC-B1 is expressed on FDC surfaces in ruminant (bovine, ovine and caprine) lymphoid organs. This protein seems to be a membrane glycoprotein of more or less 28 kDa whose sequence will be soon determined. Moreover, FDC-B1 can be used in various applications: immunofluorescence, immunoperoxidase, immunogold labellings and western blotting. FDCs are potential targets for therapy or prophylaxis in natural TSEs, such as bovine spongiform encephalopathies and scrapie. Thus, it appears of great interest to identify bovine and ovine FDCs in routine lymphoid tissues sections. An other application of this antibody to immunofluorescence histochemistry techniques will enable the study of possible direct contacts between bovine FDCs and nerve endings and thus clarify prions neuroinvasion scheme in the case of BSE and scrapie. [less ▲]

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See detailEnseignement et coaching
Defays, Jean-Marc ULg

Conference (2003, March)

Detailed reference viewed: 11 (2 ULg)
See detailLe genou du sauteur : place de l’isocinétisme dans la prise en charge rééducative
Croisier, Jean-Louis ULg

in Actes du 3ème Meeting de Médecine et Traumatologie du Sport (2003, March)

Detailed reference viewed: 64 (0 ULg)
See detailIntérêt de l’isocinétisme dans l’encadrement sportif
Croisier, Jean-Louis ULg

in Actes des Assises de Médecine du Sport en Picardie (2003, March)

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See detailIsokinetic assessment of knee flexors and extensors in professional soccer players
Croisier, Jean-Louis ULg; Réveillon, Vincent; Ferret, J. M. et al

in Isokinetics & Exercise Science (2003, March), 11(1), 61-62

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See detailIsokinetic evaluation of muscular function in patients with chronic pain and fatigability
Maquet, Didier ULg; Croisier, Jean-Louis ULg; Moutschen, Michel ULg et al

in Isokinetics & Exercise Science (2003, March), 11(1), 73-74

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See detailInfluence of the range of motion on the isokinetic performances of the knee flexors and extensors
Croisier, Jean-Louis ULg; Voisin, P.; Elbouz, Leila ULg et al

in Isokinetics & Exercise Science (2003, March), 11

Detailed reference viewed: 20 (3 ULg)
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See detailOn dictatorship, economic development and stability
Artige, Lionel ULg

Conference (2003, March)

Detailed reference viewed: 28 (4 ULg)
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See detailShoulder isokinetic exploration following shoulder rotator cuff suture
Binet, J.; Forthomme, Bénédicte ULg; Bierlaire, J. P. et al

in Isokinetics & Exercise Science (2003, March), 11

Detailed reference viewed: 34 (4 ULg)
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See detailGeographical traceabilitiy of food products.
Tychon, Bernard ULg; Oger, Robert ULg

Conference (2003, March)

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See detailProposal for the assessment protocols for different shoulder muscles groups
Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Isokinetics & Exercise Science (2003, March), 11

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See detailWork environment changes and stress. The role of work to family conflict
De Zanet, Fabrice ULg; Stinglhamber, Florence; Vandenberghe, Christian et al

Conference (2003, March)

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See detailStates of awareness associated with memory for emotional and neutral pictures in older and younger adults
D'Argembeau, Arnaud ULg; Comblain, Christine; Van der Linden, Martial ULg et al

in Brain & Cognition (2003, March), 51(2), 220-221

Detailed reference viewed: 33 (4 ULg)
See detailPreoperative assessment of the patient undergoing chest surgery
Brichant, Jean-François ULg

Conference (2003, March)

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See detailImplicit high-order geometrically conservative scheme for the solution of flow problems on moving unstructured grids
Lepot, Ingrid; Vigneron, Didier ULg; Essers, Jean-André ULg et al

Conference (2003, March)

This paper presents a finite volume solver for the computation of three-dimensional unsteady flows of inviscid compressible perfect gases on moving unstructured meshes. This solver, based on a cell ... [more ▼]

This paper presents a finite volume solver for the computation of three-dimensional unsteady flows of inviscid compressible perfect gases on moving unstructured meshes. This solver, based on a cell-centered approach for arbitrary polyhedral cells, provides unconditional second-order space and time truncation error. A new way of satisfying the Discrete Geometric Conservation Law (DGCL) adapted to this scheme is proposed. Preliminary results are presented. [less ▲]

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See detailQuelles mesures de stérilité pour les blocs locorégionaux
Brichant, Jean-François ULg

Conference (2003, March)

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See detailA risk assessment tool (osterorisk) for identifying latin american women with osteoporosis
Sen, SS; Geling, O; Messina, OD et al

in Revista Metabolismo Oseo y Mineral (2003, March), 1(1), 39-40

Detailed reference viewed: 3 (1 ULg)
See detailSimenon et les médias
Tomasovic, Dick ULg

Conference (2003, February 22)

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See detailDevelopment of a metrology and figuring machine for large X-ray mirror
Gailly, Patrick ULg; de Chambure, Daniel; Collette, Jean Paul et al

Conference (2003, February 20)

To improve the image quality of X-ray replicated mirror, A new metrology machine has been built link to a ion beam figuring machine. The first one allows to accurately measure the shape of replicated X ... [more ▼]

To improve the image quality of X-ray replicated mirror, A new metrology machine has been built link to a ion beam figuring machine. The first one allows to accurately measure the shape of replicated X-ray mirrors. The machine is dedicated to cylindrical mirrors shape whose dimensions can vary from 50 to 800 mm in height and 600 to 800 mm in diameter. The present contribution will sum up the results achieved with this machine on an actual mirror. The machine calibration results and the data analysis to obtain the mirror final shape will be detailed. The final results are compared with other measurements performed by a traditional 3-D machine. The second one is a dedicated ion figuring machine dedicated for the figuring of the X-ray mirrors. The preliminary tests were undertaken to evaluate the ion figuring process on Nickel replicated surfaces. Those results were used to improve the design of the figuring machine, a detailed description of that machine follows. The reliability of the ion figuring process is shown through an actual problem. Finally, some leading remarks about the improvements of the ion figuring ion machine and the ion figuring process in general are drawn. [less ▲]

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See detailProperties of localized, high latitude, dayside aurora
Frey, H. U.; Immel, T. J.; Lu, G. et al

Conference (2003, February 19)

[1] The FUV instrument on the IMAGE spacecraft frequently observes intense ultraviolet (UV) emission from a localized dayside region poleward of the general auroral oval location. One type of these ... [more ▼]

[1] The FUV instrument on the IMAGE spacecraft frequently observes intense ultraviolet (UV) emission from a localized dayside region poleward of the general auroral oval location. One type of these emissions has been described as the signature of direct proton precipitation into the cusp after lobe reconnection during northward interplanetary magnetic field (IMF) and high solar wind dynamic pressure periods [Frey et al., 2002]. Here we describe a completely different type of high latitude aurora, which does not show any signature of precipitating protons. It also occurs during northward IMF conditions however, only during periods of very low solar wind dynamic pressure. It occurs at a much higher geomagnetic latitude than the normal cusp location and only during periods of positive IMF By. The intensity of the UV emission is somewhat anti-correlated with the solar wind dynamic pressure, much in contrast to the cusp emission. The brightness of the localized emission changes rapidly on time scales between 30 and 70 minutes without corresponding changes in solar wind properties. Coincident measurements by the FAST spacecraft verify that this is not the cusp, that ion precipitation is absent in these regions, and that strong precipitation of field-aligned accelerated electrons causes the aurora. We interpret this aurora as the optical signature of electron precipitation in the upward leg of a current system which closes the downward leg of the current system into the cusp in the ionosphere. [less ▲]

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See detailEvolution du fractionnement de la fumure azotée
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Destain, Jean-Pierre ULg et al

in Fumure et protection phytosanitaire des céréales (2003, February 19)

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See detailFongicides: quelle stratégie adpoter?
Vancutsem, Françoise ULg; Bodson, Bernard ULg

in Fumure et protection phytosanitaire des céréales (2003, February 19)

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See detailLes mesures agri-environnementales
Buyze, Olivier; Doguet, Marie-Paule; Bontemps, Pierre-Yves et al

in Fumure et protection phytosanitaire des céréales (2003, February 19)

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See detailLes conseils de fumure azotée
Bodson, Bernard ULg; Destain, Jean-Pierre ULg; Vancutsem, Françoise ULg et al

in Fumure et Protection phytosanitaire des céréales (2003, February 19)

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See detailDiabète et hypertension artérielle
Krzesinski, Jean-Marie ULg

Conference (2003, February 15)

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See detailEtude ALLHAT : intérêt
Krzesinski, Jean-Marie ULg

Conference (2003, February 13)

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See detailLe Campylobacter fetus.
HUYNEN, Pascale ULg

Conference (2003, February 05)

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See detailAchromatic four quadrants phase mask coronagraph using the dispersion of form birefringence
Mawet, Dimitri; Lenaerts, Cedric ULg; Moreau, Vincent et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2003, February 01)

We describe an alternative design for the 4-quadrant phase mask coronagraph described recently by Rouan et al. 2000. Based on the same principle, i.e. producing a very efficient nulling by mutually ... [more ▼]

We describe an alternative design for the 4-quadrant phase mask coronagraph described recently by Rouan et al. 2000. Based on the same principle, i.e. producing a very efficient nulling by mutually destructive interferences of the coherent light from the main source, our mask realises the pi phase shift using some properties of ZOGs (Zeroth Order Gratings) and according to an original scheme respecting the 4-quadrant symmetry. When the period of the one-dimension grating structure is smaller than the wavelength of the incident light, the structure becomes birefringent. The effective refractive indices depend on the wavelength. Using this feature, we can design a mask whose nulling e±ciency is maintained within a wide wavelength range. Numerical simulations were made according to the RCWT (Rigorous Coupled Wave Theory). [less ▲]

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See detailInfluence of optical path delay control on a ground-based nulling interferometer
Absil, Olivier ULg; Coude du Foresto, Vincent

in Traub, Wesley (Ed.) Interferometry for Optical Astronomy II (2003, February 01)

Atmospheric turbulence is a major source of noise in any fiber-linked interferometer through the piston effect between the two arms of the interferometer which induces an erratic movement of the fringes ... [more ▼]

Atmospheric turbulence is a major source of noise in any fiber-linked interferometer through the piston effect between the two arms of the interferometer which induces an erratic movement of the fringes. Because the stellar light has to be permanently cancelled by the central dark fringe, a ground-based nulling interferometer is not possible without stringent optical path delay (OPD) control. In this paper, we investigate the influence of the residual OPD error of a fringe tracking unit on the performances of a nulling interferometer. The accuracy required for this control system strongly depends on the observation wavelength. If we want to detect exozodiacal clouds ten times as dense as our zodiacal dust cloud in the near-infrared (L' band), the performances of the fringe tracker are crucial: the residual OPD should be about 20 nanometers RMS. This specification can only be reached if the fringe sensor is optimized for bright sources. In the mid-infrared (N band), the requirements are strongly relaxed: OPD control with an accuracy of 400 nm RMS is sufficient to be background-limited, but a lower residual OPD (about 50 nm RMS) is strongly recommended to reduce the stellar leakage. [less ▲]

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See detailInherent modulation: a fast chopping method for nulling interferometry
Absil, Olivier ULg; Karlsson, Anders; Kaltenegger, Lisa

in Shao, Michael (Ed.) Interferometry in Space (2003, February 01)

The reduction of the thermal background emission from the local and exozodiacal dust clouds is a critical element for the success of ESA's space mission, DARWIN. Internal modulation, a technique using ... [more ▼]

The reduction of the thermal background emission from the local and exozodiacal dust clouds is a critical element for the success of ESA's space mission, DARWIN. Internal modulation, a technique using fast signal chopping, isolating the planetary signal from these noise sources, was proposed by Mennesson and Léger. In this paper, a short review of internal modulation is given, and new configurations with internal modulation are proposed to reduce the complexity of the beam-combining optics. A modification to the implementation of internal modulation is then investigated. It provides similar performance with a single detector and a greatly simplified optical layout: the number of beam-combiners is reduced by a factor of about two. The principle of inherent modulation is different from internal modulation in that no sub-interferometers are used: different phase shifts are applied to the input beams before recombination such that an asymmetric transmission map is obtained directly, without plus or minuspi/2 modulation as used in internal modulation. By combining the phase shifts and the input beams differently a transposed transmission map is obtained, allowing the signal to be chopped. During operations, multiplexing between the two interferometers is performed, such that at any time only one interferometer is being used. [less ▲]

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See detailInfrared colours of star-forming galaxies and a flux calibration of ISOCAM ELAIS catalogues
Vaisanen, Petri; Morel, Thierry ULg

in Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age (2003, February 01)

We present J and K-band near-infrared photometry of a sample of ISOCAM sources detected by the European Large Area ISO-Survey (ELAIS). All of the high-reliability LW2 (6.7 μm) sources and 80 per cent of ... [more ▼]

We present J and K-band near-infrared photometry of a sample of ISOCAM sources detected by the European Large Area ISO-Survey (ELAIS). All of the high-reliability LW2 (6.7 μm) sources and 80 per cent of the LW3 (15 μm) sources are identified in the near-IR survey reaching K â 17.5 mag. The near- to mid-IR flux ratios can effectively be used to separate stars from galaxies in mid-IR surveys: at 6.7 μm, 80 per cent of the identified ELAIS objects are stars while at 15 μm 80 per cent are galaxies. The stars are then used to perform an accurate new calibration of the ELAIS ISOCAM data at both 6.7 and 15 μm: we adopt values of 1.23 and 1.05 ADU/gain/s/mJy for the LW2 and LW3 filters, respectively. The ISOCAM ELAIS survey is found to mostly detect strongly star-forming late-type galaxies. We show that near to mid-IR colour-colour diagrams can be used to further classify galaxies, as well as study star-formation. In a [15/2.2] vs. [6.7/2.2] plot the Hubble type of a galaxy can be roughly estimated from its position along the diagonal ([6.7/15] = 1) and the star-forming efficiency from a galaxys departure from the diagonal (eg. [6.7/15] <1). The ELAIS galaxies yield an average mid-IR flux ratio LW2/LW3 =0.67 ± 0.27. We discuss this [6.7/15] ratio as a star formation tracer using ISO and IRAS data of a local comparison sample. The [2.2/15] ratio is also found to be a good indicator of activity level in galaxies and conclude that the drop in the [6.7/15] ratio seen in strongly star-forming galaxies is a result of both an increase of 15 μm emission and an apparent depletion of 6.7 μm emission. [less ▲]

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See detailDesign and tests for the heliospheric imager of the STEREO mission
Defise, Jean-Marc ULg; Halain, Jean-Philippe ULg; Mazy, Emmanuel ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2003, February 01)

The Heliospheric Imager (HI) is part of the SECCHI suite of instruments on-board the two STEREO spacecrafts to be launched in 2005. The two HI instruments will provide stereographic image pairs of solar ... [more ▼]

The Heliospheric Imager (HI) is part of the SECCHI suite of instruments on-board the two STEREO spacecrafts to be launched in 2005. The two HI instruments will provide stereographic image pairs of solar coronal plasma and coronal mass ejections (CME) over a wide field of view (~90°), ranging from 13 to 330 R[SUB]0[/SUB]. These observations compliment the 15 R[SUB]0[/SUB] field of view of the solar corona obtained by the other SECCHI instruments (2 coronagraphs and an EUV imager). The key challenge of the instrument design is the rejection of the solar disk light, with total straylight attenuation of the order of 10[SUP]-13 [/SUP]to 10[SUP]-15[/SUP]. A multi-vane diffractive baffle system has been theoretically optimized to achieve the lower requirement (10[SUP]-13[/SUP] for HI-1) and is combined with a secondary baffling system to reach the 10[SUP]-15[/SUP] rejection performance in the second camera system (HI-2). This paper presents the last updates of the SECCHI/HI design concept, with the expected performance. A verification program is currently in progress. The on-going stray-light verification tests are discussed. A set of tests has been conducted in air, and under vacuum. The results are presented and compared with the expected theoretical data. [less ▲]

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See detailDarwin ground-based European nulling interferometer experiment (GENIE)
Gondoin, Philippe; Absil, Olivier ULg; Fridlund, C V Malcolm et al

in Traub, Wesley (Ed.) Interferometry for Optical Astronomy II (2003, February 01)

Darwin is one of the most challenging space projects ever considered by the European Space Agency (ESA). Its principal objectives are to detect Earth-like planets around nearby stars and to characterize ... [more ▼]

Darwin is one of the most challenging space projects ever considered by the European Space Agency (ESA). Its principal objectives are to detect Earth-like planets around nearby stars and to characterize their atmospheres. Darwin is conceived as a space "nulling interferometer" which makes use of on-axis destructive interferences to extinguish the stellar light while keeping the off-axis signal of the orbiting planet. Within the frame of the Darwin program, the European Space Agency (ESA) and the European Southern Observatory (ESO) intend to build a ground-based technology demonstrator called GENIE (Ground based European Nulling Interferometry Experiment). Such a ground-based demonstrator built around the Very Large Telescope Interferometer (VLTI) in Paranal will test some of the key technologies required for the Darwin Infrared Space Interferometer. It will demonstrate that nulling interferometry can be achieved in a broad mid-IR band as a precursor to the next phase of the Darwin program. The present paper will describe the objectives and the status of the project. [less ▲]

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See detailRegulation of training system for adults in educational technology
Denis, Brigitte ULg; Piette, Sylvie-Anne

in Stacey, E.; Davies, E. (Eds.) Quality education @ a distance (2003, February)

This paper reports the characteristics of a post graduate diploma on educational technologies based on a combination of face-to-face and distance activities and assesses its quality. We first define the ... [more ▼]

This paper reports the characteristics of a post graduate diploma on educational technologies based on a combination of face-to-face and distance activities and assesses its quality. We first define the bases of the training program and present several tools (logbook, portfolio and questionnaires) which have been used to evaluate and regulate both training and individual learning process. Our observations indicate an increase and better regulation of the quality of the educational and learning processes. On the basis of the results we achieved, we propose that our original design could be extended to similar adult training programs. The way this innovative system is integrated in the universities shows an evolution due to its success that implies a certain kind of return on investment due to the demand of such kinds of device. [less ▲]

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See detailRouting in a MPLS network featuring preemption mechanisms
Blanchy, François; Mélon, Laurent; Leduc, Guy ULg

in 10th IEEE International Conference on Telecommunications (2003, February)

In the context of Multiprotocol Label Switching (MPLS), we propose an integration of a computationally efficient preemption mechanism into a very dynamic Label Switched Paths (LSPs) routing scheme ... [more ▼]

In the context of Multiprotocol Label Switching (MPLS), we propose an integration of a computationally efficient preemption mechanism into a very dynamic Label Switched Paths (LSPs) routing scheme described in a previous paper. This preemption scheme includes a quick heuristic able to select the most interesting LSPs to reroute from a link. The efficiency of this algorithm is obtained through a very rigid but seemingly appropriate policy concerning which LSPs are appropriate for preemption. A feedback from preemption on the routing process is proposed, in order to regulate the rate of the reroutings and to tune the balance between stability and continuous reorganization in a network. This integrated traffic engineering entity is tested on the accuracy of the heuristic, the relevance of the feedback and the whole integration, the influence of the routing policy on the preemption mechanism and the reliability of the managed network. [less ▲]

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See detailDecentralized local backup LSP calculation with efficient bandwidth sharing
Mélon, Laurent; Blanchy, François; Leduc, Guy ULg

in 10th IEEE International Conference on Telecommunications (2003, February)

This paper focuses on the protection of virtual circuits (Label Switched Paths, LSPs) in a (G)MPLS (Generalised Multi-Protocol Label Switching) network. The proposed algorithm is designed to protect ... [more ▼]

This paper focuses on the protection of virtual circuits (Label Switched Paths, LSPs) in a (G)MPLS (Generalised Multi-Protocol Label Switching) network. The proposed algorithm is designed to protect traffic with strong delay requirements such as EF (Expedited Forwarding) ordered aggregates in a DiffServ domain. For this type of application endto- end recovery schemes are usually considered to be far too slow. Local, fast-rerouting is the only solution which can compete with restoration times offered by SONET self-healing ring. However local restoration has a cost in terms of extra bandwidth consumed for the backup paths. Our scheme thus includes a sophisticated resource aggregation mechanism based on the concepts of "backup-backup aggregation" and "backupprimary aggregation". The path selection algorithm is also designed to efficiently reduce the resource usage. Moreover, when considering LSPs at different preemption levels, our algorithm is able to correctly calculate the amount of bandwidth that can be preempted despite the sharing of resource. We show that our approach, though local, can compete with the state-of-theart end-to-end recovery schemes in terms of resource reservation. The major contribution of our scheme, the "backup-primary aggregation", was then also used in the context of end-to-end recovery and improved its performance substantially. [less ▲]

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See detailLa fibromyalgie : exploration fonctionnelle musculaire
Maquet, Didier ULg; Croisier, Jean-Louis ULg; Demoulin, Christophe ULg et al

in Abstract book des Mardis de la Kinésithérapie 2003 (2003, February)

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See detailHuman-Visual-System-Based Fusion of Multimodality 3D Neuroimagery using Brain-Shift-Compensating Finite-Element-Based Deformable Models
Verly, Jacques ULg; Vigneron, Lara; Petitjean, Nicolas et al

in Proceedings of SPIE (2003, February), 5029

Our goal is to fuse multimodality imagery to enhance image-guided neurosurgery. Images that need to be fused must be registered. Registration becomes a challenge when the imaged object deforms between the ... [more ▼]

Our goal is to fuse multimodality imagery to enhance image-guided neurosurgery. Images that need to be fused must be registered. Registration becomes a challenge when the imaged object deforms between the times the images to be fused are taken. This is the case when “brain-shift” occurs. We begin by describing our strategy for nonrigid registration via finite-element methods. Then, we independently discuss an image fusion strategy based on a model of the human visual system. We illustrate the operation of many components of the registration system and the operation of the fusion system. [less ▲]

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See detailPit-I and other somatotrope candidate genes to optimize selection for milk traits in bovine species: the 21 century's strategy.
Parmentier, Isabelle; Gillard, Nathalie; Abras, Sven et al

Poster (2003, February)

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See detailEtude de la sélectivité tissulaire d’un nouvel antagoniste des récepteurs au thromboxane A2, le BM-613
Hanson, Julien ULg; Rolin, S.; De Leval, X. et al

Poster (2003, January 31)

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See detailNouveaux analogues du cromakalim en tant qu’agents pharmacologiques potentials de la classe des activateurs des canaux KATP
Sebille, S.; Boverie, S.; De Tullio, Pascal ULg et al

Conference (2003, January 31)

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See detailSélection dans les conditions subtropicales d’une bactérie lactique aux propriétés probiotiques.
Bayane, A.; Diawara, B.; Roblain, D. et al

Poster (2003, January 22)

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See detailMéthode rapide de sélection de bactéries probiotiques par choc osmotique et marquage aux fluorochromes
Sow, M.; Roblain, D.; Thonart, Philippe ULg

Poster (2003, January 22)

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See detailPISA, a powerful tool to foster literacy development.
Lafontaine, Dominique ULg

Conference (2003, January 10)

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See detailCalcification and organic production of coccolithophorids Emiliania huxleyi under different atmospheric pCO2 in a mesocosm experiment
Delille, Bruno ULg; Harlay, Jérôme ULg; Chou, Lei et al

Poster (2003, January 07)

The response of primary production and calcification of the coccolithophorid Emiliania huxleyi to different partial pressures of CO2 (p CO2) have been investigated during a mesocosm bloom experiment in a ... [more ▼]

The response of primary production and calcification of the coccolithophorid Emiliania huxleyi to different partial pressures of CO2 (p CO2) have been investigated during a mesocosm bloom experiment in a Norwegian fjord. Glacial, present and next century atmospheric p CO2 conditions (respectively 180, 370 and 700 ppmV) have been simulated above the surface of large sea-water enclosures. If production of organic matter remains constant under elevated p CO2, the production of inorganic carbon appears to be affected in two ways. First, the beginning of calcification is delayed. Second, the production rate of inorganic carbon appears to be lowered by 40% in the future conditions, decreasing subsequently the calcification/photosynthesis ratio from 1 to 0.6. During the experiment a strong viral growth have been experienced, which have seriously depressed calcification as well. We propose the threshold of 5.10 6 cell/ml for E huxleyi virus abundance above which the production and calcification of the population of E. huxleyi are severely affected. [less ▲]

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See detailCharacterization of marine CaCO3 particles in the context of Global Change
Aerts, Katrien; Godoi, Ricardo; Harlay, Jérôme ULg et al

Poster (2003, January 07)

The expected increase in greenhouse gasses concentrations as a result of human activity is leading to significant climate change in the coming years. The fate of the anthropogenic CO2 has been intensively ... [more ▼]

The expected increase in greenhouse gasses concentrations as a result of human activity is leading to significant climate change in the coming years. The fate of the anthropogenic CO2 has been intensively studied. Being the largest reservoir of reactive carbon, the ocean acts as an important sink for anthropogenic CO2 and plays a significant role on the global biogeochemical cycle of carbon and its perturbations. There remain, however, large uncertainties concerning the uptake of carbon by the ocean, mainly due to insufficient knowledge of processes controlling the carbonate chemistry in surface waters. The effects of precipitation of calcium carbonate by calcifying organisms in the euphotic zone and redissolution of their skeletons have not been fully taken into account. This precipitation-dissolution process affects both the concentration of dissolved inorganic carbon and of total alkalinity and plays thus a significant role in the buffering capacity of seawater and its potential to act as a sink or a source of CO2 for the atmosphere. We aim to study the processes associated with the oceanic production and dissolution of CaCO3 in order to quantify the role of calcifying phytoplanktonic organisms in sequestering CO2. The calcareous skeletons of Coccolithophores, which comprise one of the main groups of calcifying organisms in the photic zone of the ocean, are analysed. The gut content of copepods, which grazes on coccolithophores is examined by different methods like Electron Probe Micro-Analysis (EPMA) and Micro X-Ray Fluorescence (M-XRF) in order to detect the possible dissolution features at the calcite surface. Automatic EPMA is used for the characterization of individual particles from ocean samples for their composition, morphology and size. Subsequent statistical processing techniques classifies the particles into specific particle clusters. [less ▲]

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See detailAssessment of the importance of the carbonate pump in surface waters of the Bay of Biscay
Harlay, Jérôme ULg; Chou, Lei; Dedonder, Virginie et al

Poster (2003, January 07)

Marine carbon research in the past decade has been mainly devoted to the understanding and quantification of processes controlling the fluxes of organic matter in the ocean. Little attention has been paid ... [more ▼]

Marine carbon research in the past decade has been mainly devoted to the understanding and quantification of processes controlling the fluxes of organic matter in the ocean. Little attention has been paid until now to the particulate inorganic carbon whose net fluxes to the sediments are comparable to those of the organic matter. There remains still a large uncertainty in the production and the fate of biogenic calcium carbonate in the oceanic carbon cycle. In the framework of the Belgian global change programme, we have developed a project devoted to the study of the inorganic carbon cycle in the Bay of Biscay where coccolithophorid blooms occur frequently. The study focuses on processes associated with the oceanic production and dissolution of calcium carbonate, by combining field investigations, laboratory experiments and modelling efforts. The rate of primary production and of calcification by phytoplankton is evaluated by 14C incubation experiments during a coccolithophorid bloom-forming period in the area of investigation. The relative production of organic matter and calcium carbonate in the photic zone along a transect from the continental shelf across the slope to deep waters will be presented. A tentative mass balance of the carbon fluxes for this area will be constructed. These preliminary results confirm the importance that the calcium carbonate pump may play in open ocean. [less ▲]

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See detailFonds de vallée : quelle gestion pour un développement durable ?
Rosillon, Françis ULg

in Actes du séminaire préalable à la définition d'un programme de recherche interdisciplinaire (2003, January)

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See detailApports de la recherche et outils mis en place pour la gestion et le contrôle de la qualité.
Sindic, Marianne ULg; Dardenne, Pierre

in L'avenir des filières de qualité différenciée. (2003, January)

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See detailCaractérisation physiologique de Bifidobactérium pour utilisation probiotique.
Majad, L.; Evrard, P.; Thonart, Philippe ULg

Poster (2003, January)

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See detailVariability of air-sea CO2 fluxes in the Southern Ocean inferred from CARIOCA drifters, ships and remotely sensed measurements
Boutin, J.; Rangama, Y.; Etcheto, J. et al

Poster (2003, January)

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See detailAppliquer le nez électronique pour reconnaître et suivre en continu de mauvaises odeurs dans l'environnement
Nicolas, Jacques ULg

Conference (2003, January)

Le nez électronique avec une configuration très simple fournit des résultats encourageants pour détecter une odeur dans l’environnement. Il existe un réel espoir de pouvoir fabriquer des instruments ... [more ▼]

Le nez électronique avec une configuration très simple fournit des résultats encourageants pour détecter une odeur dans l’environnement. Il existe un réel espoir de pouvoir fabriquer des instruments portables capables de prévoir une odeur inconnue en temps réel sur le terrain. Le monitoring des odeurs environnementales est un challenge, mais une simple estimation est suffisante, il n'y a pas besoin de conditions opératoires très rigoureuses. Il reste néanmoins beaucoup de travail à faire avant que le nez électronique ne devienne une réalité dans l’environnement. La communication présente ce challenge en l'illustrant par de nombreuses applications réalisées par l'équipe de recherche. [less ▲]

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See detailEtude de l'hyperactivité bronchique induite par l'administration pulmonaire de cyclodextrines chez la souris
Bertholet, Pascal; Guéders, Maud ULg; Barillaro, Valery et al

Conference (2003, January)

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See detailEtude in vivo d’une adsorption de probiotique (Lb. Plantarum) au niveau du tractus intestinal d’un poulet
Dubois Dauphin, Robin ULg; Amor, L.; Roblain, D. et al

Poster (2003, January)

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See detailLes facteurs de succès dans l'accompagnement du portage à distance de cours
Delfosse, Catherine ULg; Harmeling, Danielle; Poumay, Marianne ULg et al

in Actes du Colloque des deuxièmes rencontres du Kirchberg. (2003, January)

This paper presents a reflection about the key success factors involved in the process of turning traditional courses into on-line active courses. Within the context of ‘FORMADIS’ and other programmes ... [more ▼]

This paper presents a reflection about the key success factors involved in the process of turning traditional courses into on-line active courses. Within the context of ‘FORMADIS’ and other programmes, more than twenty projects have been accompanied by the LabSET in the past 3 years. The paper gives an overview of the tools and methods used for teacher support and training. It examines the projects ‘doing well’ and analyse what makes them sucessful. It considers the moment at which the success factors take place (before, during and after the various phases of development). It illustrates these key factors with practical examples. Whereas the majority of these factors seem to be obvious, this analysis will help considering the relations between them as well as the way of managing them successfully. [less ▲]

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See detail« Preuve et signature électronique des actes juridiques »,
Lecocq, Pascale ULg

in Delnoy, Paul (Ed.) Chronique de droit à l'usage des juges de paix et de police 2003 (2003, January)

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See detailExchange processes and nitrogen cycling on the shelf and slopes area of the Black Sea basin.
Grégoire, Marilaure ULg; Beckers, Jean-Marie ULg; Kostianoy, A. et al

Conference (2003, January)

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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 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 detailOn conspiracism as part of populist ideology
Jamin, Jérôme ULg

Conference (2003)

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