References of "Scientific congresses and symposiums"
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See detailModern techniques for flood risk analysis: quasi-3D simulations in a GIS environment
Archambeau, Pierre ULg; Erpicum, Sébastien ULg; Dewals, Benjamin ULg et al

in Geophysical Research Abstracts (2005), 7(09348),

Human beings have continuously attempted to adapt their environment to their needs. However, many natural phenomena still remain challenging to control and the populations must undergo sometimes heavily ... [more ▼]

Human beings have continuously attempted to adapt their environment to their needs. However, many natural phenomena still remain challenging to control and the populations must undergo sometimes heavily damaging consequences. It is consequently essential to study these phenomena in order to assess their potential hazards. In particular, the scope of the present paper focus on floods. The intense floods met these last years showed the importance of this phenomenon as well as its many devastating effects. Thanks to recent important breakthroughs, both in the field of conceptual and numerical modelling of complex flows and in the calculation power of computers, it is henceforth possible to study the effects of potential floods on the basis of numerical simulations, with an accuracy never reached beforehand. The Laboratory of Applied Hydrodynamics and Hydraulic Constructions (HACH) of the University of Liege has always made this kind of study one of its core competencies, thanks to • the development of modern and powerful modelling tools (quasi-three dimensional software for flow simulation by finite volume), • the use of a broad range of data enabling a proper representation of the studied fields (topography, occupation of the ground...) • the systematic validation of simulation results. These tools are currently intensively used within the framework of a general study of the flood-prone zones of the Walloon area of Belgium, which corresponds to more than 800 km of rivers. [less ▲]

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See detailEffect of FEM choices in the modelling of incremental forming of aluminium sheets
He, S.; Van Bael, A.; Van Houtte, P. et al

in Banabic, D. (Ed.) Proceedings of the 8th ESAFORM Conference on Material Forming (2005)

This paper investigates the process of single point incremental forming of an aluminium cone with a 50-degree wall angle. Finite element (FE) models are established to simulate the process. Different FE ... [more ▼]

This paper investigates the process of single point incremental forming of an aluminium cone with a 50-degree wall angle. Finite element (FE) models are established to simulate the process. Different FE packages have been used. Various aspects associated with the numerical choices as well as the material and process parameters have been studied. The final geometry and the reaction forces are presented as the results of the simulations. Comparison between the simulation results and the experimental data is also made. [less ▲]

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See detailUpdate of diagnostic preoperative images using low-field interventional MRI for neurosurgery: rigid-body registration
Kavec, Martin; Wikler, David; Phillips, Christophe L. et al

Conference (2005)

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See detailSubchondral Bone Osteoblasts Induce Phenotypic Changes in Human Osteoarthritic Chondrocytes
Sanchez, Christelle ULg; Deberg, Michelle ULg; Piccardi, Nathalie et al

in Osteoporosis International (2005), 16(Suppl.3), 55-56

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See detailPaysage et projets urbains
Teller, Jacques ULg

in Actes du Colloque de la CPDT – Territoire, urbanisation et paysages du 19 novembre 2004 (2005)

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See detailAdvanced particle characterization for improved understanding of cold spray coating quality
Pirard, Eric ULg; Campana, Florent; Janssen, Jean-Pierre

in Pawlowski, Lech (Ed.) 2e Rencontres Int. Projection Thermique (2005)

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See detailRobustness of Planar Shape Descriptors of Particles
Pirard, Eric ULg; Dislaire, Godefroid

in Chung, C.-F. (Ed.) Proceedings Mathematical Geology Congress (2005)

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See detailApplication of an advanced transient stability assessment and control method to a realistic power system
Cirio, D.; Lucarella, D.; Vimercati, G. et al

in Proceedings of the 15th Power System Computation Conference (PSCC 2005) (2005)

The paper presents a technical overview of a large research project on Dynamic Security Assessment (DSA) supported by EU. Transient Stability Assessment and Control, which was one of the main goals of the ... [more ▼]

The paper presents a technical overview of a large research project on Dynamic Security Assessment (DSA) supported by EU. Transient Stability Assessment and Control, which was one of the main goals of the project, is taken into consideration by presenting the fundamental theoretical methodology and possible applications. A specific prototype installation for a realistic power system is then reported by presenting and commenting some of the obtained results. [less ▲]

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See detailNew developments in the application of automatic learning to power system control
Wehenkel, Louis ULg; Glavic, Mevludin; Ernst, Damien ULg

in Proceedings of the 15th Power System Computation Conference (PSCC 2005) (2005)

In this paper we present the basic principles of supervised learning and reinforcement learning as two complementary frameworks to design control laws or decision policies within the context of power ... [more ▼]

In this paper we present the basic principles of supervised learning and reinforcement learning as two complementary frameworks to design control laws or decision policies within the context of power system control. We also review recent developments in the realm of automatic learning methods and discuss their applicability to power system decision and control problems. Simulation results illustrating the potentials of the recently introduced fitted Q iteration learning algorithm in controlling a TCSC device aimed to damp electro-mechanical oscillations in a synthetic 4-machine system, are included in the paper. [less ▲]

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See detailDiagnostic de l'intoxication aiguë par les insecticides organophosphorés basés sur la détermination de l'activité cholinestérasique
Turcant, A.; Dehon, B.; Ganière-Monteil, C. et al

Poster (2005)

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See detailFEM applied in hydro-mechanical coupled analysis of a slope
Yanakieva, A.; Datcheva, Maria; Iankov, R. et al

Conference (2005)

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See detailUnified approach of coupled constitutive laws
Collin, Frédéric ULg; Laloui, Lyesse; Charlier, Robert ULg

Conference (2005)

A number of geomaterials constitutive models have been proposed for the coupling of the mechanical behaviour with i) multi-phase fluid flow and suction level, ii) the thermal field changes and iii) more ... [more ▼]

A number of geomaterials constitutive models have been proposed for the coupling of the mechanical behaviour with i) multi-phase fluid flow and suction level, ii) the thermal field changes and iii) more recently the chemical concentration evolution. Most of these models follow a common framework that will be first emphasised and then particularised for the 3 considered couplings. [less ▲]

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See detailOn the numerical modeling of shear banding around an excavation
Collin, Frédéric ULg; Li, Xiang Ling; Lambarki, A. et al

Conference (2005)

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See detailLarge strain elasto/viscoplastic constitutive model. Theory and numerical scheme
Ponthot, Jean-Philippe ULg; GARCIA-GARINO, C.; MIRASSO, A.

in MECOM 2005, Mecanica Computational (2005)

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See detailBehaviour of seismic resistant braced frames with innovative dissipative (INERD) connections
Vayas, I.; Thanopoulos, P.; Castiglioni, C. et al

in Proceedings of the EUROSTEEL Conference 2005 (2005)

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See detailRobust Non-Rigid Object Tracking Using Point Distribution Models
Mathes, Tom; Piater, Justus ULg

in British Machine Vision Conference (2005)

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See detailObject Tracking Using Color Interest Points
Gabriel, Pierre; Hayet, Jean-Bernard; Piater, Justus ULg et al

in International Conference on Advanced Video and Signal based Surveillance (2005)

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See detailInteractive Learning of Mappings from Visual Percepts to Actions
Jodogne, Sébastien ULg; Piater, Justus ULg

in 22nd International Conference on Machine Learning (2005)

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See detailTask-Driven Learning of Spatial Combinations of Visual Features
Jodogne, Sébastien ULg; Scalzo, Fabien; Piater, Justus ULg

in Proc. of the IEEE Workshop on Learning in Computer Vision and Pattern Recognition (2005)

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See detailReinforcement Learning of Perceptual Classes using Q Learning Updates
Jodogne, Sébastien ULg; Piater, Justus ULg

in Proc. of the 23rd IASTED International Conference on Artificial Intelligence and Applications (2005)

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See detailProsodie, syntaxis en informatiestructuur in het Frans en in het Nederlands: een studie in Functionele Grammatica
Rasier, Laurent ULg

in Hiligsmann, Philippe; Beheydt, Ludovic; Degand, Liesbeth (Eds.) et al Neerlandistiek in Frankrijk en Franstalig België / Les études néerlandaises en Belgique francophone et en France (2005)

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See detailEarly pregnancy detection in sheep. Secondary communication
Karen, Aly; Beckers, Jean-François ULg; Sulon, Joseph ULg et al

Poster (2005)

A szerzők a juhok vemhességének korai megállapítására összehasonlították a progeszteron- (P4) és a vemhességi fehérje (PAG) RIA-tesztek megbízhatóságát. A PAG-teszttel a nem vemhes állatok nagyobb ... [more ▼]

A szerzők a juhok vemhességének korai megállapítására összehasonlították a progeszteron- (P4) és a vemhességi fehérje (PAG) RIA-tesztek megbízhatóságát. A PAG-teszttel a nem vemhes állatok nagyobb biztonsággal voltak felismerhetők. Nagyszámú állaton (n=949 és 764) végzett rectalis ultrahangvizsgálattal a vemhességet pontosabban tudták megállapítani, ha az állatokat 12 óráig koplaltatták és vizsgálat közben a hasfalat a tőgy előtt felemelték. Az ultrahangvizsgálat és a PAG-teszt eredményeinek összehasonlításával megállapították, hogy az utóbbi megbízhatóbb eredményt ad. [less ▲]

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See detailAllergie systémique à l'insuline: traitement médical ou chirurgical (greffe de pancréas vascularisé)?
Leonet, J.; RADERMECKER, Régis ULg; Malaise, J. et al

in Diabète & Métabolisme (2005), 31

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See detailContre la poésie, tout contre
Denis, Benoît ULg

Conference (2005)

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See detailOxidants and airway inflammation
Kirschvink, N.; Lekeux, Pierre ULg

in 3rd World Equine Airways Symposium (WEAS) (2005)

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See detailEvolution possible de la PAC à l'horizon 2020. Poursuite du glissement vers "le 2ème pilier", cadrage par rapport à l'OMC. Quels sont les scénarios, les adaptations possibles ?
Burny, Philippe ULg

in Centre wallon de Recherches Agronomiques (Ed.) La 11ème Journée Fourrage Actualités "Comment prendre en compte le long terme dans l'orientation donnée à nos systèmes d'élevages herbagers ?" (2005)

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See detailEffect of oral and inhaled corticosteroids on bronchial reactivity and airway inflammation in a feline model of asthma
Kirschvink, Nathalie; Leemans, Jérôme ULg; Delvaux, François ULg et al

in In proceedings: 15th Congress European College of Veterinary Internal Medicine – companion animals (2005)

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See detailHard pomeron contribution to forward elastic scattering
Cudell, Jean-René ULg; Lengyel, A.; Martynov, E. et al

in Nicolescu, B. (Ed.) Conference On Elastic And Diffractive Scattering: Towards High Energy Frontiers: The 20th Anniversary Of The Blois Workshops (2005)

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See detailTheophylline increases glutathione in BAL of cadmium-exposed rats
Kirschvink, Nathalie; Fievez, Laurence ULg; Desmet, C. et al

in Proceedings of the American Thoracic Society, San Diego, California (2005)

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See detailEvaluation of the bronchoprotective effects of inhaled salmeterol, fenoterol and oxitropium in healthy cats
Kirschvink, Nathalie; Leemans, Jérôme ULg; Delvaux, F. et al

in Fundamental & Clinical Pharmacology (2005), 19

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See detailA lattice model for BNE and RBNE
Ludewig, François ULg; Vandewalle, Nicolas ULg

in Powders and Grains 2005 (2005)

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See detailComment concevoir un quartier « multifonction » pour promouvoir un développement urbain durable ?
Teller, Jacques ULg; Becue, V.

in Proc. du colloque Développement urbain durable, gestion des ressources et gouvernance (2005)

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See detailPhylogeography of Harbour Porpoise (Phocoena phocoena) in the Eastern North Atlantic and in the Black Sea Explored by the Analyses of Nuclear and Mitochondrial DNA
Fontaine, Michaël; Baird, C.; Stuart, J. E. et al

Poster (2005)

Study of the genetic population structure and the demographic history of the harbour porpoise (Phocoena phocoena) has been nearly comprehensive throughout its distribution in North Atlantic, most studies ... [more ▼]

Study of the genetic population structure and the demographic history of the harbour porpoise (Phocoena phocoena) has been nearly comprehensive throughout its distribution in North Atlantic, most studies using the mitochondrial control region as a genetic marker. Although these studies have shown population structure in some parts of the North Atlantic, mitochondrial DNA is a single, maternally inherited locus and therefore insufficient to fully characterize population structure and history. Polymorphism at 11 microsatellite loci was analyzed in harbour porpoises collected throughout the range of the species in the Central and Eastern North Atlantic from the Iberian peninsula northward to Arctic waters (Portugal, Spain, bay of Biscay, Irish waters, English Channel, the southern bay of the North Sea, Norway, Faroe Islands, and Iceland) and also along the coasts of the Black Sea (Turkey, Ukraine, Bulgaria and Georgia). Multilocus tests for allele frequency differences and population structure estimates indicate complete genetic isolation between Atlantic and Black Sea porpoises. No fine population structure was observed within the Black Sea, and this population displayed a low genetic diversity compared to those of Atlantic. These results can be interpreted in the light of the demographic history of this relict population and the strong founder effect and bottleneck it may have undergone in its past evolution. In Eastern North Atlantic waters, microsatellite data revealed fine scale partitioning of the genetic variation. These results will be compared to the pattern previously reported based on the analysis of the mtDNA control region, and seem to correlate with variation in oceanographic features. [less ▲]

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See detailLes productions de l’atelier de potiers des « Quatre Bornes » aux Rues-des-Vignes (Nord)
Deru, Xavier ULg

in Rivet, Lucien (Ed.) Actes de la Société française d’étude de la céramique en Gaule, Blois 2005 (2005)

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See detailMalattia e introspezione
Dondero, Maria Giulia ULg

in Marrone, Gianfranco (Ed.) Il discorso della salute. Verso una sociosemiotica medica (2005)

Cet article étudie le genre photographique du portrait et celui de la nature morte en les mettant en relation avec la représentation de la maladie et de la déformation corporelle. On analyse un corpus ... [more ▼]

Cet article étudie le genre photographique du portrait et celui de la nature morte en les mettant en relation avec la représentation de la maladie et de la déformation corporelle. On analyse un corpus d’images photographiques de l’artiste J.-P. Witkin qui mettent en scène des corps affectés par le dysfonctionnement des organes. Ces derniers ne sont pas représentés comme des corps vivants et uniques, différemment de ce qui se passe dans le genre pictural du portrait (qui implique une forme de vie singularisante), mais ils figurent comme des objets de design ou comme des natures mortes. Cette recherche met donc en évidence l’écart entre les genres stabilisés dans la tradition picturale et les genres photographiques. [less ▲]

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See detailInfluence of depth perception on performance and time evaluation in minimal access surgery
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2005)

This study aimed to evaluate the impact of depth perception on surgical tasks performance and time evaluation. 98 novice subjects performed a fine surgical task with a new laparoscopic technology (da ... [more ▼]

This study aimed to evaluate the impact of depth perception on surgical tasks performance and time evaluation. 98 novice subjects performed a fine surgical task with a new laparoscopic technology (da Vinci robotic system). They were divided in two groups, one using 3D view option and another using 2D view option. We measured time performance and asked subjects to evaluate their time performance. Our results showed subjects performed significantly quicker with robotic system in 3D than with robotic system in 2D. We obtained a significant interaction between time performance and time evaluation: in 2D condition, subjects accurately evaluated their time performance while in 3D condition, subjects evaluated their time performance as being longer than their real performance and even than real or evaluated performances of subjects in 2D condition. Our findings emphasize the role of 3D in improving performance and the contradictory feeling about time evaluation in 2D and 3D. [less ▲]

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See detailSelective inhibition of AP-1 activity in airway immune cells ameliorates experimental asthma
Desmet, Christophe ULg; Gosset, P.; Garzé, V. et al

in Proceedings: The American Thoracic Society (2005)

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See detailAbnormalities of smooth muscles in human GI motility disorders revealed by novel immunomarkers
Wedel, Theo; van Eys, G.; Glénisson, Wendy et al

Poster (2005)

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See detailRelationship between leptin and adiposity in three cattle breeds
Daix, Marie; Pirotte, Cécile; Bister, Jean-Loup et al

in Acta Physiologica 2005; Volume 185 (2005)

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See detailFaudrait-il donc se résoudre à réparer les dégâts ?
Guillaume, Jean-François ULg

in Pelleriaux, Koen (Ed.) Vivre ensemble ? Pistes de réflexion pour une accessibilité des associations de jeunesse en Flandre, à Bruxelles et en Wallonie (2005)

Dans la sphère des activités d’éducation et d’encadrement de la jeunesse, l’école et la famille ont longtemps occupé une position prépondérante. Mais leur place et leur rôle se sont considérablement ... [more ▼]

Dans la sphère des activités d’éducation et d’encadrement de la jeunesse, l’école et la famille ont longtemps occupé une position prépondérante. Mais leur place et leur rôle se sont considérablement modifiés avec les changements survenus dans l’organisation politique des sociétés et dans les échanges intergénérationnels. L’affaiblissement des programmes éducatifs « traditionnels » contribue à remodeler les frontières entre les différents acteurs institutionnels et à susciter de nouvelles attentes à leur égard. Dans ce contexte, quelles questions peuvent aider à orienter l’action des associations de jeunesse ? [less ▲]

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See detailEncéphalocéle frontoethimoidale: Encéphalite herpétique comme premier signe d'une méningite récurrente
Leroy, P.; Daron, A.; Weerts, E. et al

in Revista de Neurologia (2005)

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See detailDentin sialophosphoprotein expression correlates with progression markers in human prostate cancer
Chaplet, Michael; Waltregny, David ULg; Detry, Cédric ULg et al

in Journal of Bone and Mineral Research (2005), 20(Suppl. 2), 45

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See detailA role for external representations in architectural design ?
Decortis, F.; Safin, Stéphane ULg; Leclercq, Pierre ULg

in Gero, John; Bonnardel, Nathalie (Eds.) Proceedings of Studying Designers '05 (2005)

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See detailPrevention of perinatal GBS infections: update and guidelines
MELIN, Pierrette ULg

Conference (2004, December 17)

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See detailStudy of a novel elicitor produced by Pseudomonas putida BTP1 in the ISR on bean
Jourdan, Emmanuel ULg; Ongena, Marc ULg; Schaffer, M. et al

Poster (2004, December 17)

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See detailEvaluation of food born lactic acid bacteria for their use as protective cultures in food
Dortu, C.; Thonart, Philippe ULg

Poster (2004, December 17)

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See detailDiscovery of non-biodegradable fossil cellulose.
Lechien, V.; Rodriguez, Ch.; Grandjean, Jean ULg et al

Poster (2004, December 17)

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See detailSaturn's UV Aurora Imaged with HST during the Cassini Approach to Saturn
Clarke, J. T.; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Poster (2004, December 13)

A series of HST STIS UV images of Saturn's aurora were obtained on 13 days in Jan. 2004 as the Cassini spacecraft measured the approaching solar wind properties. Clear general correlations have been found ... [more ▼]

A series of HST STIS UV images of Saturn's aurora were obtained on 13 days in Jan. 2004 as the Cassini spacecraft measured the approaching solar wind properties. Clear general correlations have been found between the auroral power and a) Saturn's kilometric radiation, and b) the solar wind dynamic pressure, but not with the direction of the interplanetary magnetic field. While these general correlations are now well established, a closer examination of the data raises many interesting questions. Saturn's auroral emissions exhibit both local time and co-rotational properties, the auroral oval does not appear centered on the magnetic and rotational pole, the auroral emissions exhibit large and unexpected motions in latitude with time and/or planetary rotation, and the auroral oval does not appear continuous, but broken with longitude. This talk will present a more detailed look at Saturn's aurora from the HST images, with a comparison of auroral emission properties to those at the Earth and Jupiter. [less ▲]

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See detailLa fin de la Belgique ou la fin du modèle régionaliste
Hermans, Michel ULg

Conference (2004, December 13)

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See detailTraitements conservateurs de la lombalgie.
TOMASELLA, Marco ULg

in Abstract Book of 2nd International Symposium of the Belgium Back Society. Prise en charge interdisciplinaire de la lombalgie. (2004, December 11)

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See detailPrepartum management of severe preeclampsia
Brichant, Jean-François ULg

Conference (2004, December 11)

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See detailScreening or not for Group B Streptococci: Screening is necessary
MELIN, Pierrette ULg

Conference (2004, December 09)

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See detailEvaluation de l’effet d’oubli induit à la récupération dans le vieillissement normal
Hogge, Michaël; Adam, Stéphane ULg; Collette, Fabienne ULg

Poster (2004, December 04)

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See detailAn Ecology of Knowledges and Practices : The Salamanca Island Project (Colombia)
Melard, François ULg

Conference (2004, December 03)

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See detailPolycationes: interacciones con estructuras biológicas y futuras aplicationes
Grandfils, Christian ULg; Foresto, Patricia; Valverde, N et al

Conference (2004, December 02)

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See detailStroop interference and negative priming in normal aging
Hogge, Michaël; Adam, Stéphane ULg; Collette, Fabienne ULg

Poster (2004, December 02)

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See detailCensure et vérité. A propos de la “critique radicale” des médias
Durand, Pascal ULg

Conference (2004, December 02)

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See detailBinaries in the Hipparcos data: Keep digging, I. Search for binaries without `a priori' knowledge of their orbital elements: Application to barium stars
Jorissen, A.; Jancart, Sylvie ULg; Pourbaix, D.

in Hensberge, H; Pavlovski, K.; Hilditch, R.W. (Eds.) Spectroscopically and Spatially Resolving the Components of the Close Binary Stars (2004, December 01)

This work makes use of Hipparcos data to test the algorithms of (i) binary detection and (ii) orbital-parameters determination, which could possibly be used in the GAIA pipeline. The first item is ... [more ▼]

This work makes use of Hipparcos data to test the algorithms of (i) binary detection and (ii) orbital-parameters determination, which could possibly be used in the GAIA pipeline. The first item is addressed in this paper, whereas the second one is addressed in a companion paper by Pourbaix, Jancart, & Jorissen (2004, this volume). Here we test the ability of the algorithm to detect binaries from scratch, i.e., from the astrometric data without any a priori knowledge of the orbital elements. The Hipparcos Intermediate Astrometric Data of a complete sample of 163 barium stars (supposed to be all members of binary systems from theoretical considerations) are used as a test bench. When \varpi > 5 mas and P < 4000 d, the binary detection rate is close to 100%, but it falls to 22% when considering the whole sample, because many barium stars have small parallaxes or very long periods. [less ▲]

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See detailOn the Characteristics and Source Regions of Dayside Proton Precipitation
Chua, D. H.; Dymond, K. F.; Budzien, S. A. et al

Conference (2004, December 01)

The source regions of precipitating protons on the dayside and their dependence on solar wind conditions are studied using far-ultraviolet (FUV) spectral observations and imaging. The High-resolution ... [more ▼]

The source regions of precipitating protons on the dayside and their dependence on solar wind conditions are studied using far-ultraviolet (FUV) spectral observations and imaging. The High-resolution Ionospheric and Thermospheric Spectrograph (HITS) aboard the Advanced Research and Global Observation Satellite (ARGOS) observes Doppler-shifted H Lyman-α emissions from precipitating protons with a spectral resolution of 1.5 Angstroms. The shapes of these Doppler spectra are indicative of the energy and pitch angle distributions of the proton precipitation. Global images of H Lyman-α emissions obtained by the SI-12 instrument on the IMAGE spacecraft are examined to relate the spectral observations to the dayside morphology of the proton aurora. During periods of sustained southward interplanetary magnetic field (IMF), the dayside proton aurora spectra exhibit broad Doppler shifts and are similar to those observed on the nightside with inferred mean energies typical of plasma sheet protons of magnetospheric origin. Global images of proton aurorae under these conditions show continuous regions of H Lyman-α emissions across the dayside extending from the nightside. In contrast, during periods of northward or variable IMF, proton aurora emissions on the dayside often appear in an isolated spot in the noon to late afternoon MLT sector. The Doppler-spectra of the proton emissions in these regions are narrow, indicating precipitation with low mean energies and from a different origin than that observed in the southward IMF cases. These spectra may be indicative of magnetosheath protons that have direct access to the ionosphere through high-latitude dayside reconnection. This study further quantifies the characteristics of dayside proton precipitation under various states of the magnetosphere and highlights the importance of IMF orientation on the coupling between the high-latitude, dayside ionosphere and its plasma sources at higher altitudes. [less ▲]

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See detailLimits for the application of spectroscopic mode ID methods
Zima, W.; Kolenberg, K.; Briquet, Maryline ULg et al

in IAU Symposium, No. 224, The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. (2004, December 01)

Spectroscopic mode identification techiques, which monitor intensity variations across an absorption line, provide the possibility of determining the quantum numbers l and m, the inclination and the ... [more ▼]

Spectroscopic mode identification techiques, which monitor intensity variations across an absorption line, provide the possibility of determining the quantum numbers l and m, the inclination and the intrinsic pulsation amplitude of a star. Of course, the uncertainties of the mode identification are dependent on the quality of the observations and the identification method applied. We have focused on the Pixel-by-pixel method/Direct line profile fitting (Mantegazza 2000) and the Moment method (Balona 1987, Briquet & Aerts 2003) for pinpointing mode parameters and tested the impact of various observational effects and stellar properties on the identification. [less ▲]

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See detailBinaries in the Hipparcos data: keep digging II. Modeling the IAD of known spectroscopic systems
Pourbaix, D.; Jancart, Sylvie ULg; Jorissen, A.

in Hensberge, H.; Pavlovski, K.; Hilditch, R. W. (Eds.) Spectroscopically and Spatially Resolving the Components of the Close Binary Stars (2004, December 01)

We reprocess the Hipparcos Intermediate Astrometric Data of know spectroscopic binaries (retrived from the 9th catalogue of spectroscopic binary orbits, http://sb9.astro.ulb.ac.be) to see whether the ... [more ▼]

We reprocess the Hipparcos Intermediate Astrometric Data of know spectroscopic binaries (retrived from the 9th catalogue of spectroscopic binary orbits, http://sb9.astro.ulb.ac.be) to see whether the orbital inclination, and thus the mass of the secondary, can be derived. Several statistical tests (Pourbaix & Arenou 2001) are used to ensure the reliability of the fit. About 70 systems (originally processed as single stars) out of 863 benefit from the orbital model. [less ▲]

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See detailThe PEGASE project: characterisation of "Pegasi planets" and Brown Dwarfs
Baudoz, P.; Rouan, D.; Schneider, J. et al

in Combes, F.; Barret, D.; Contini, T. (Eds.) et al SF2A-2004: Semaine de l'Astrophysique Francaise (2004, December 01)

I will present the PEGASE project proposed within the framework of the CNES call for idea on flights in formation. This ambitious project, gathering a dozen laboratories, proposes an interferometry ... [more ▼]

I will present the PEGASE project proposed within the framework of the CNES call for idea on flights in formation. This ambitious project, gathering a dozen laboratories, proposes an interferometry mission in infrared I(1.5 to 6 µm) with spectroscopic capabilities. The bases of the interferometer will reach up to 500m, giving to PEGASE a resolution higher than the milli-arcsecond. The interferometric recombination includes a very simple mode, measurement of the visibility by excursion of the optical path difference and a mode in black fringe or nulling. The very high angular resolution of the instrument and high dynamical range with the nulling mode will allow to consider exciting scientific objectives: the characterization of Pegasids or hot Jupiters, the study of the internal structure and the atmospheres of brown dwarfs and the analysis of the internal areas of proto-planetary disks. I will first of all describe the basic configuration of the mission and will show that its simplicity ensures the feasibility of the project. I will explain then the relevance of such an instrument for the characterization of Pegasids. I will detail finally the various possible technical options to be attached to the initial version, in order to increase the effectiveness of the mission and to extend its scientific objectives. [less ▲]

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See detailFUV remote sensing of the isotropic boundary and magnetotail stretching
Blockx, Caroline ULg; Gérard, Jean-Claude ULg; Meurant, M. et al

Conference (2004, December 01)

Several studies attempted to identify the Isotropic Boundary (IB) defining the limit between the adiabatic and non-adiabatic trajectories of the trapped protons along closed magnetic field lines. This ... [more ▼]

Several studies attempted to identify the Isotropic Boundary (IB) defining the limit between the adiabatic and non-adiabatic trajectories of the trapped protons along closed magnetic field lines. This boundary is an indicator of the amount of magnetic field lines' stretching in the magnetotail. These studies are based on in situ measurements, resulting in spatially and temporally restricted samples. To avoid this limitation, we propose to use global data obtained with the FUV-SI12 proton imager on board IMAGE spacecraft. We determine at each magnetic local time the position of an optical boundary equivalent to IB and thereby the stretching of the magnetic field lines. We show that the correspondence between the latitude of the maximum proton precipitation observed by SI12 and the IB measured by DMSP satellites is statistically established and depends on the magnetic local time. The relation between the position of the maximum proton precipitation as well as the intensity of this maximum and the magnetic field's distortion is determined by comparison with GOES-8 data. We thus suggest that SI12 can be used as a tool for the global determination of the isotropic boundary and to monitor the amount of stretching in the magnetotail. [less ▲]

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See detailA search for radial magnetic field gradients in Ap atmospheres
Nesvacil, N.; Hubrig, S.; Jehin, Emmanuel ULg et al

in Zverko, J. (Ed.) The A-Star Puzzle (2004, December 01)

For the first time the possible presence of radial gradients of magnetic fields in the atmospheres of three magnetic Ap stars has been critically examined by measurements of the mean magnetic field ... [more ▼]

For the first time the possible presence of radial gradients of magnetic fields in the atmospheres of three magnetic Ap stars has been critically examined by measurements of the mean magnetic field modulus from spectral lines resolved into magnetically split components lying on the different sides of the Balmer jump. A number of useful diagnostic lines below and above the Balmer discontinuity, only slightly affected by blends, with simple doublet and triplet Zeeman pattern have been identified from the comparison between synthetic spectra computed with the SYNTHMAG code and the high resolution and S/N spectra obtained in unpolarized light with the ESO-VLT UVES spectrograph. For all three stars of our sample, HD 965, HD 116114 and 33 Lib (HD 137949), an increase of the magnetic field strength of the order of a few hundred Gauss has been detected bluewards of the Balmer discontinuity. These results should be taken into account in future modelling of the geometric structure of Ap star magnetic fields and the determination of the chemical abundances in Ap stars with strong magnetic fields. [less ▲]

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See detailComparison of intense nightside shock induced aurora and substorms activity
Meurant, M.; Gérard, Jean-Claude ULg; Blockx, Caroline ULg et al

Conference (2004, December 01)

Variations of the solar wind dynamic pressure induce perturbation of magnetospheric processes. These perturbations frequently induce dayside enhancements of activity with particular features such as low ... [more ▼]

Variations of the solar wind dynamic pressure induce perturbation of magnetospheric processes. These perturbations frequently induce dayside enhancements of activity with particular features such as low latitude proton flash, low latitude arcs and aurora propagating eastward and westward from noon to the night sector. In some cases, these shocks may also induce an enhancement of the nightside activity during which the power precipitated in the night sector may reach values as high as observed during substorms. Various studies have shown that high precipitated powers are more likely during period of negative values of the North - South IMF components. Liou et al (2003) have shown that substorm-like activity is not frequent after a shock and they concluded that a shock may not be considered as a substorm trigger. The question addressed in this study is to know up to what point the substorm like nightside activity triggered by a shock is comparable to a classical substorm. For this purpose, we analyze four events presenting nightside activity morphologically similar to substorms and occurring within a short time (less than 20 minutes) after the arrival of a pressure pulse on the front of the magnetosphere. Different features of these events such as the mean energy of precipitated electrons, the motion of boundaries before and after onset and the power precipitated in the nightside region are compared to typical substorms. Except for the absence of southward motion of activity before onset, shock induced substorms appear very similar to isolated substorms. We investigate the ability of a shock to trigger a substorm during periods characterized by particular conditions. We suggest that the sign of B[SUB]z[/SUB] plays an important role as well as the history of solar wind and interplanetary magnetic field and the resulting state of the magnetosphere. [less ▲]

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See detailOn the way of understanding the adaptation to extreme pH of family 11 xylanases: Structural comparison and mutational analysis
De Lemos Esteves, Frédéric ULg; Ruelle, Virginie; Gouders, Thierry et al

Poster (2004, December)

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See detailFluid Bearings in LOX
Bozet, Jean-Luc ULg

Conference (2004, December)

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See detailAragonite Undersaturation in the High-Latitude Surface Ocean Within the 21st Century
Orr, J. C.; Fabry, Véronique ULg; Aumont, O. et al

Conference (2004, December)

The surface ocean is everywhere saturated with calcium carbonate (CaCO[SUB]3[/SUB]). Yet increasing atmospheric CO[SUB]2[/SUB] reduces ocean pH and carbonate ion concentration and thus the level of ... [more ▼]

The surface ocean is everywhere saturated with calcium carbonate (CaCO[SUB]3[/SUB]). Yet increasing atmospheric CO[SUB]2[/SUB] reduces ocean pH and carbonate ion concentration and thus the level of saturation. Here we show with ocean data and models that due to this anthropogenic acidification, some surface waters will become undersaturated within decades. When atmospheric CO[SUB]2[/SUB] reaches 550 ppmv, in year 2050 under the IS92a business-as-usual scenario, Southern Ocean surface waters begin to become undersaturated with respect to aragonite, a metastable form of CaCO[SUB]3[/SUB]. By 2100 as atmospheric CO[SUB]2[/SUB] reaches 788 ppmv, undersaturation extends throughout the entire Southern Ocean (<60[SUP]o[/SUP]S) and into the surbarctic Pacific. Meanwhile, Weddell Sea surface waters also become undersaturated with respect to calcite, the stable form of CaCO[SUB]3[/SUB]. These transient changes are much larger than seasonal, interannual, and decadal variability. They threaten high-latitude aragonite secreting organisms including cold-water corals, which provide essential fish habitat, and shelled pteropods, i.e., zooplankton that serve as an abundant food source for marine predators. [less ▲]

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See detailCollective Motion: Bistability and Trajectory Tracking
Paley, Derek; Leonard, Naomi; Sepulchre, Rodolphe ULg

in Proceedings of the 43rd IEEE Conference on Decision and Control (2004, December)

This paper presents analysis and application of steering control laws for a network of self-propelled, planar particles. We explore together the two stably controlled group motions, parallel motion and ... [more ▼]

This paper presents analysis and application of steering control laws for a network of self-propelled, planar particles. We explore together the two stably controlled group motions, parallel motion and circular motion, for modeling and design purposes. We show that a previously considered control law simultaneously stabilizes both parallel and circular group motion, leading to bistability and hysteresis. We also present behavior primitives that enable piecewise-linear network trajectory tracking. [less ▲]

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See detailA Long-Term Slip-Rate Study Along The North Anatolian Fault, Eksik, Turkey Using Cosmogenic 36Cl
Kozaci, O; Dolan, J; Finkel, R et al

in EOS : Transactions, American Geophysical Union (2004, December)

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See detailRelationships between incremental and cumulative fold growth with neotectonic examples from the southern Tianshan, China
Suppe, J; Hubert, Aurelia ULg; Wang, Xin

in EOS : Transactions, American Geophysical Union (2004, December)

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See detailClues for Differential Diagnosis of atypical myopathy
Votion, Dominique ULg; Amory, Hélène ULg; Sandersen, Charlotte ULg et al

in Proceeding of the Maastricht International Congress on Equine Medicine (MICEM) (2004, December)

Atypical myopathy (AM), also called “atypical myoglobinuria”, is a frequently and rapidly fatal myopathy of unknown origin occurring sporadically in grazing horses. As opposed to the exertional ... [more ▼]

Atypical myopathy (AM), also called “atypical myoglobinuria”, is a frequently and rapidly fatal myopathy of unknown origin occurring sporadically in grazing horses. As opposed to the exertional rhabdomyolysis syndrome (ERS), clinical signs of AM are not induced by exercise. The condition has been reported in several European countries including Belgium, France, Germany and Great Britain. Clinical signs of AM are characterised by muscular weakness, stiffness, recumbency, sweating and when urine is observed, myoglobinuria. These signs are characteristic but not pathognomonic of the disease; the differential diagnosis of sudden weakness, severe myopathy and/or unexpected death includes several neurogenic and myopathic disorders. The main pathologies that share clinical similarities with AM include the acute form of grass sickness (GS), acute piroplasmosis, botulism, ERS, the hyperkalemic periodic paresis (HPP), nutritional myopathy (NM; i.e. vitamin E and/or selenium deficiency), plants or drugs (i.e. ionophores intoxication) intoxication, tetanus and postanaesthesia myopathy. This report aims at reviewing key facts in history, clinical signs, clinical examination and laboratory findings that contribute towards the diagnosis of AM and/or invalidate the diagnosis of other pathologies. [less ▲]

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See detailOn the Robustness of Air-Sea Flux Estimates of Carbon Dioxide from Ocean Inversions
Mikaloff Fletcher, S. E.; Gruber, N. P.; Jacobson, A. et al

Conference (2004, December)

Inverse methods analogous to those used for atmospheric inversions have been adapted to estimate regional air-sea fluxes of carbon dioxide using ocean interior observations of dissolved inorganic carbon ... [more ▼]

Inverse methods analogous to those used for atmospheric inversions have been adapted to estimate regional air-sea fluxes of carbon dioxide using ocean interior observations of dissolved inorganic carbon and related tracers and an Ocean General Circulation Model (OGCM). We estimate seperately the preindustrial component and the component due to the anthropogenic perturbation of atmospheric carbon dioxide. Previous sensitivity studies have shown that model circulation is one of the most important sources of error in the ocean inversion. We present estimates of preindustrial and anthropogenic air-sea carbon dioxide exchange using a suite of nine different OGCM's in order to quantify the robustness of our results and explore the role of different representations of ocean circulation in the inversion. Most of the large scale features of the inverse estimates are robust across all models. The preindustrial inverse estimates generally follow the expected pattern of uptake at high latitudes and out gassing in the tropics; however, all of the models call for out gassing in the Southern Ocean between 44S and 58 S. The greatest anthropogenic carbon uptake occurs at mid- to high- latitudes, with a large anthropogenic carbon sink in the Southern Ocean, while the bulk of the anthropogenic carbon storage occurs at mid-latitudes. Preliminary results also suggest interesting, robust differences between these inverse estimates and estimates from forward model simulations. Both the preindustrial and anthropogenic carbon dioxide flux estimates are most robust at mid and high northern latitudes, except for the high latitude North Atlantic. The carbon dioxide flux estimates are most uncertain in the Southern Ocean, where the inverse estimates are strongly dependent on the rates of deep water ventilation in the OGCM. The preindustrial inverse estimates for the Indian Ocean are also sensitive to the choice of OGCM, and the anthropogenic estimates have significant uncertainties in the tropical Pacific. Over large spatial scales, inverse estimates based on different OGCM's are in better agreement than estimates based on forward simulations of the same models, but this is not necessarily true for smaller model regions. [less ▲]

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See detailLa carte des territoires paysagers de Wallonie
Droeven, Emilie ULg; Kummert, Magali

Poster (2004, December)

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See detailSeismic Diagrams for beta Cephei stars; A database for COROT
Thoul, Anne ULg

Conference (2004, December)

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See detailMultiwavelength and multi-epoch imaging of RXS J1131-1231
Sluse, Dominique ULg

Conference (2004, December)

We report results from a large set of multi-wavelength images of the quadruply imaged quasar RXS J1131-1231. We show images of this system and of the Einstein ring from the visible to the near infrared ... [more ▼]

We report results from a large set of multi-wavelength images of the quadruply imaged quasar RXS J1131-1231. We show images of this system and of the Einstein ring from the visible to the near infrared. We infer from these images an improved astrometry and we compare various simple models. Based on the flux variations observed in various filters during a 1.5 year period, we deduce two likely microlensing scenarios. Finally, we try to explain the observed chromatic variations of the flux ratios and we discuss the occurence of a flux ratio anomaly in this system. [less ▲]

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See detailCharacterization of inulin stored at different relative humidities by MDSC and X-ray diffraction, related to soption isotherms.
Ronkart, Sébastien; Fougnies, C.; Paquot, Michel ULg et al

Poster (2004, December)

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See detailBiomaterials, their potential in medicine and their actual side effects
Grandfils, Christian ULg

Conference (2004, November 29)

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See detailESR studies of the in-situ nitroxide-mediated polymerization (NMP) of styrene using a nitrone
Sciannamea, Valérie; Bernard, M.; Catala, J.-M. et al

Conference (2004, November 26)

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