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See detailReconstruire la ville sur la ville - Recyclage des espaces dégradés
De Keersmaecker, M.-L.; Barthe-Bastalle, Hélène; Gérard, Sabine et al

Report (2004)

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See detailOPEN-LOOP STABILIZATION OF 2D IMPACT JUGGLING
Ronsse, Renaud; Lefèvre, Philippe; Sepulchre, Rodolphe ULg

in Proceedings of 6th IFAC Symposium on Nonlinear Control Systems (2004, September)

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2D impact juggling. It is shown that some periodic orbits that are unstable in the elastic xed wedge become ... [more ▼]

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2D impact juggling. It is shown that some periodic orbits that are unstable in the elastic xed wedge become exponentially stable in the (non-)elastic vibrating wedge. These orbits are linked with some classical juggling patterns, providing an interesting benchmark for the study of the frequency-locking properties in human rhythmic tasks. [less ▲]

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See detailSTABILIZATION THROUGH WEAK AND OCCASIONAL INTERACTIONS : A BILLIARD BENCHMARK
Gerard, Manuel; Sepulchre, Rodolphe ULg

in Proceedings of the 6th IFAC Symposium on Nonlinear Control Systems (2004, September)

The paper addresses the stabilization of periodic orbits in a wedge billiard with actuated edges. It is shown how the rich dynamical properties of the open-loop dynamics, e.g. ergodicity properties and ... [more ▼]

The paper addresses the stabilization of periodic orbits in a wedge billiard with actuated edges. It is shown how the rich dynamical properties of the open-loop dynamics, e.g. ergodicity properties and KAM curves, can be exploited to design robust stabilizing feedbacks with large basins of attraction. [less ▲]

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See detailEstrogen and pain: a study in aromatase knock-out mice using the formalin model.
Multon, Sylvie ULg

Conference (2004, September)

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See detailInnover ... ou périr !
Van Caillie, Didier ULg

Article for general public (2004)

This short chronicle recalls the strong link between innovation ability and performance and highlights the fact that failing firms are also often firm suffering from a lack of innovation.

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See detailGrafting of alkoxyamine end-capped (co)polymers onto multi-walled carbon nanotubes
Lou, Xudong; Detrembleur, Christophe ULg; Sciannamea, Valérie et al

in Polymer (2004), 45(18), 6097-6102

Multi-walled carbon nanotubes (MWNTs) have been successfully modified by polystyrene, poly(epsilon-caprolactone), and their block copolymers by addition reaction of the alkoxyamine-terminated precursors ... [more ▼]

Multi-walled carbon nanotubes (MWNTs) have been successfully modified by polystyrene, poly(epsilon-caprolactone), and their block copolymers by addition reaction of the alkoxyamine-terminated precursors. Polymer-modified MWNTs are easily dispersed in good solvents for the grafted polymer, such as toluene and THF. This observation has been confirmed by TEM analysis. The grafting ratio of polystyrene chains at the surface of MWNTs depends on the polymer molecular weight. [less ▲]

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See detailBulletin agrométéorologique - Juillet 2004
Tychon, Bernard ULg; Ozer, Pierre ULg; Horion, S. et al

in Bulletin Agrométéorologique (2004), 3(4), 1-4

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See detailDynamical study of the pentaquark antidecuplet
Stancu, Floarea ULg

in Physics Letters B (2004), 595

Dynamical calculations are performed for all isomultiplets of the flavour antidecuplet to which the newly discovered pentaquark Theta(+) belongs. The framework is a constituent quark model where the short ... [more ▼]

Dynamical calculations are performed for all isomultiplets of the flavour antidecuplet to which the newly discovered pentaquark Theta(+) belongs. The framework is a constituent quark model where the short-range interaction has a flavour-spin structure. In this model the lowest pentaquarks have positive parity. Each antidecuplet member is described by a variational solution with the Pauli principle properly taken into account. By fitting the mass of Theta(+) of minimal content uudd, the mass of Xi(--), of minimal content ddss (u) over bar, is predicted at approximately 1960 MeV. The influence of the octet-antidecuplet mixing on the masses of the Y = I and 0 pentaquarks is considered within the same model and the role of the hyperfine interaction in this mixing is pointed out. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailLes territoires paysagers de Wallonie, première étape de connaissance en vue de la mise en œuvre de la Convention européenne du paysage en Région wallonne
Droeven, Emilie ULg; Kummert, Magali

in Conférence de la Convention européenne du paysage à l’occasion de son entrée en vigueur. Conseil de l’Europe, Palais de l’Europe, Strasbourg 17 juin 2004. Rapport (2004)

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See detailFocii determination of an off axis ellipsoid : Theory to practice
Houbrechts, Yvette ULg; Roose, Stéphane ULg; Stockman, Yvan ULg

in Osten, W.; Novak, E. (Eds.) Proceedings of the Eighth International Conference on Laser and Laser Information Technologies (2004, August 02)

In the frame of cryogenic test on an off axis ellipsoid, it has been required to set-up an unambiguous method to determine and track the foci position during temperature transitions. This procedure was ... [more ▼]

In the frame of cryogenic test on an off axis ellipsoid, it has been required to set-up an unambiguous method to determine and track the foci position during temperature transitions. This procedure was mandatory to avoid: (1) impact of the operator skills working on triple shift scheme to assure continuously monitoring of the ellipsoid shape during cool down. (2) correctly dissociate the impact of the thermal deformation on the mirror shape with respect to alignment errors. This paper will demonstrate the process, starting from ideal ellipsoid shape, then introducing 3D metrology data in a model, and finally presents the results in a practical situation. [less ▲]

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See detailAbout the methods of preparation of poly(ethylene oxide)-b-poly(epsilon-caprolactone) nanoparticles in water. Analysis by dynamic light scattering
Vangeyte, Patrick; Gautier, Sandrine; Jérôme, Robert ULg

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2004), 242(1-3), 203-211

Self-assembly of nonionic amphiphilic poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) and poly(ethylene oxide)-b-poly(γ-methyl-ε-caprolactone) (PEO-b-PMCL) has been studied in water by dynamic ... [more ▼]

Self-assembly of nonionic amphiphilic poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) and poly(ethylene oxide)-b-poly(γ-methyl-ε-caprolactone) (PEO-b-PMCL) has been studied in water by dynamic light scattering (DLS). The aqueous solutions have been prepared by three methods, i.e., dialysis of solutions in a common organic solvent against water, rapid addition of water to organic solutions, and rapid addition of organic solutions into water. Several common organic solvents have been used: tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc) and dimethylsulfoxide (DMSO). The dialysis method is not reproducible and leads to very large and polydispersed particles (~1µm). In contrast, nanoparticles are formed by the two other methods with a low polydispersity and a size in the 30-10 nm range, depending on the organic solvent used. The particle size increases when the concentration in the organic solvent is decreased. The effect of temperature and length of the hydrophobic block has also been studied. [less ▲]

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See detailOn the determination of oxygen abundances in chromospherically active stars
Morel, Thierry ULg; Micela, G.

in Astronomy and Astrophysics (2004), 423

We discuss oxygen abundances derived from [O I] λ6300s and the O I triplet in stars spanning a wide range in chromospheric activity level, and show that these two indicators yield increasingly discrepant ... [more ▼]

We discuss oxygen abundances derived from [O I] λ6300s and the O I triplet in stars spanning a wide range in chromospheric activity level, and show that these two indicators yield increasingly discrepant results with higher chromospheric/coronal activity measures. While the forbidden and permitted lines give fairly consistent results for solar-type disk dwarfs, spuriously high O I triplet abundances are observed in young Hyades and Pleiades stars, as well as in individual components of RS CVn binaries (up to 1.8 dex). The distinct behaviour of the [O I]-based abundances which consistently remain near-solar suggests that this phenomenon mostly results from large departures from LTE affecting the O I triplet at high activity level that are currently unaccounted for, but also possibly from a failure to adequately model the atmospheres of K-type stars. These results suggest that some caution should be exercised when interpreting oxygen abundances in active binaries or young open cluster stars. Based on observations collected at the European Southern Observatory, Chile (Proposals 64.L-0249 and 071.D-0260). Table \ref{tab_data} is only available in electronic form at http://www.edpsciences.org [less ▲]

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See detailSynthesis of data availability for the river Meuse and the aquifer located in the alluvial plain in the Walloon Meuse catchment region
Batlle-Aguilar, Jordi; Popescu, Ileana-Cristina; Orban, Philippe ULg et al

Report (2004)

During the three first months of the AQUATERRA project, the Group of Hydrogeology and Environmental Geology from the University of Liège (HGULg) has performed a general inventory of data sources and ... [more ▼]

During the three first months of the AQUATERRA project, the Group of Hydrogeology and Environmental Geology from the University of Liège (HGULg) has performed a general inventory of data sources and availability for the Walloon part of the Meuse basin in Belgium. This deliverable provides the information in the form of a summary table that gives a general description of data types, accessibility (public or confidential, free or charged…) and, if existing, a website with further useful information. In this synthesis, emphasis is put on hydrogeological information. However, general information on surface water is also provided when available. In the following months, needed data will be collected for the Meuse/Basin experimental sites in the Walloon region. Collected datasets will be introduced into the Hydrogeological Database HYGES developed by HGULg. This database is presently updated for the needs of the AQUATERRA Project. This synthesis will be further updated when new information and data sources are available. [less ▲]

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See detailOrganisation of « sport + studies programmes » at secondary school level: the perceptions of the students and the staff
Cloes, Marc ULg

in Klissouras, V.; Kellis, S.; Mouratidis, I. (Eds.) Proceedings of the 2004 Pre-Olympic Congress. Sport Science through the Ages. (2004, August)

It is undeniable that sporting success requires an intensive practice, increasingly early and strictly supervised. This necessarily implies that the young athltes find a balance btween the sporting and ... [more ▼]

It is undeniable that sporting success requires an intensive practice, increasingly early and strictly supervised. This necessarily implies that the young athltes find a balance btween the sporting and school education. All around the world, seceral organisations were proposed in order to facilitate the task of the sporting hopes and to enable them to encure their future life as well as possible. [less ▲]

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See detailMigration of contaminants through the unsaturated zone overlying the Hesbaye chalky aquifer in Belgium: a field investigation
Brouyère, Serge ULg; Dassargues, Alain ULg; Hallet, Vincent

in Journal of Contaminant Hydrology (2004), 72(1-4), 135-164

This paper presents the results of a detailed field investigation that was performed for studying groundwater recharge processes and solute downward migration mechanisms prevailing in the unsaturated zone ... [more ▼]

This paper presents the results of a detailed field investigation that was performed for studying groundwater recharge processes and solute downward migration mechanisms prevailing in the unsaturated zone overlying a chalk aquifer in Belgium. Various laboratory measurements were performed on core samples collected during the drilling of boreholes in the experimental site. In the field, experiments consisted of well logging, infiltration tests in the unsaturated zone, pumping tests in the saturated zone and tracer tests in both the saturated and unsaturated zones. Results show that gravitational flows govern groundwater recharge and solute migration mechanisms in the unsaturated zone. In the variably saturated chalk, the migration and retardation of solutes is strongly influenced by recharge conditions. Under intense injection conditions, solutes migrate at high speed along the partially saturated fissures, downward to the saturated zone. At the same time, they are temporarily retarded in the almost immobile water located in the chalk matrix. Under normal recharge conditions, fissures are inactive and solutes migrate slowly through the chalk matrix. Results also show that concentration dynamics in the saturated zone are related to fluctuations of groundwater levels in the aquifer. A conceptual model is proposed to explain the hydrodispersive behaviour of the variably saturated chalk. Finally, the vulnerability of the chalk to contamination issues occurring at the land surface is discussed. (C) 2003 Elsevier B.V. All rights reserved. [less ▲]

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See detailPorous poly(α-hydroxyacid)/Bioglass® composite scaffolds for bone tissue engineering. I: preparation and in vitro characterisation
Maquet, Véronique; Boccaccini, Aldo R.; Pravata, Laurent et al

in Biomaterials (2004), 25(18), 4185-4194

Highly porous composites scaffolds of poly-D,L-lactide (PDLLA) and poly(lactide-co-glycolide) (PLGA) containing different amounts (10, 25 and 50wt%) of bioactive glass (45S5 bioglass®) were prepared by ... [more ▼]

Highly porous composites scaffolds of poly-D,L-lactide (PDLLA) and poly(lactide-co-glycolide) (PLGA) containing different amounts (10, 25 and 50wt%) of bioactive glass (45S5 bioglass®) were prepared by thermally induced solid-liquid phase separation (TIPS) and subsequent solvent sublimation. The addition of increasing amounts of bioglass® into the polymer foams decreased the pore volume. Conversely, the mechanical properties of the polymer materials were improved. The composites were incubated in phosphate buffer saline at 37°C to study the in vitro degradation of the polymer by measurement of water absorption, weight loss as well as changes in the average molecular weight of the polymer and in the pH of the incubation medium as a function of the incubation time. The addition of bioglass®to polymer foams increased the water absorption and weight loss compared to neat polymer foams. However, the polymer molecular weight, determined by size exclusion chromatography, was found to decrease more rapidly and to a larger extent in absence of bioglass®. The presence of the bioactive filler was therefore found to delay the degradation rate of the polymer as compared to the neat polymer foams. Formation of hydroxyapatite on the surface of composites, as an indication of their bioactivity, was recorded by EDXA, X-ray diffractometry and confirmed by Raman spectroscopy. [less ▲]

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See detailAnalysis of the volleyball spike: relationships between several parameters and the speed of the ball
Cloes, Marc ULg; Croisier, Jean-Louis ULg; Barsin, M. et al

Poster (2004, August)

In volleyball, the spike's effectiveness is a determining element of the team's success. To perform at a high level, a player must be able to produce spikes characterized by a speed of the ball that ... [more ▼]

In volleyball, the spike's effectiveness is a determining element of the team's success. To perform at a high level, a player must be able to produce spikes characterized by a speed of the ball that increase the defence's uncertainly. A high speed spike needs technical and muscular qualities. ... [less ▲]

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See detailImprovement of students’ motivation in a pe class. An action-research project
Cloes, Marc ULg; Viseur, C.; Motter, Pascale

in Klissouras, V.; Kellis, S.; Mouratidis, I. (Eds.) Proceedings of the 2004 Pre-Olympic Congress. Sport Science through the Ages. (2004, August)

Adolescents' motivation is a major concern of PE teachers. Many students, especially girls, are characterized by unmotivated behaviours in the gym. For two decades, quantitative research has been ... [more ▼]

Adolescents' motivation is a major concern of PE teachers. Many students, especially girls, are characterized by unmotivated behaviours in the gym. For two decades, quantitative research has been conducted to better understand the problem. More recently, some qualitative studies have been proposed. ... [less ▲]

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See detailAnalysis of anthropometric caracteristics and jumping ability in junior top level volleyball athletes. Comparison by role
Ciccarone, G.; Fontani, G.; Albert, Adelin ULg et al

Poster (2004, August)

This study is focused on the comparison of the players characteristics in youth Italian top level volleyball athletes according to the role on the game.

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See detailPE teachers’ competencies: which ones are considered as the most important and where are they acquired?
Cloes, Marc ULg; Laraki, Nadine; Piéron, Maurice

Poster (2004, August)

It is well accepted that teacher prepration is a long term process during which a large array of competencies are progressively developed. Since 2001, in the French Community of Belgium, a decree lists ... [more ▼]

It is well accepted that teacher prepration is a long term process during which a large array of competencies are progressively developed. Since 2001, in the French Community of Belgium, a decree lists the competencies that teachers should develop to achieve their role within the educational system. This study aimed to identify competencies taht PE teachers consider as important and to determine, from their point of view, in which context these competencies are developed. [less ▲]

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