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See detailLiaison autoroutière « CHB » : la Wallonie s’empêtre dans des choix dépassés
Lamarche, Caroline; Leprince, Pierre ULg; Outers, Jean-Luc et al

Article for general public (2007)

Magnétique, l'affiche mobilisatrice pour la marche « Ensemble pour le climat et la solidarité » de ce 8 décembre à Bruxelles, ces humains nus convergeant vers notre planète à protéger. Superbe symbole qui ... [more ▼]

Magnétique, l'affiche mobilisatrice pour la marche « Ensemble pour le climat et la solidarité » de ce 8 décembre à Bruxelles, ces humains nus convergeant vers notre planète à protéger. Superbe symbole qui ne doit pas nous faire oublier l'avertissement placé en tête d'affiche : « Ça commence ici ». « Ici », on nous le répète, c'est ma maison où je peux fermer le robinet, visser des ampoules économiques, baisser le chauffage, placer du double vitrage. Mais il y a un autre « ici » : notre beau coin d'Europe, nos villes et nos campagnes. Et là, pour Noël, le gouvernement wallon s'apprête à déposer un énorme cadeau dans nos petits souliers. Un truc neuf ? Non, vieux de presque un demi-siècle. Pas trop crade ? De luxe au contraire : 400 millions d'euros. Au moment de la conférence de Bali sur le changement climatique, ça a à voir avec le climat ? Mais oui ! Et c'est… ? Un permis de construire. Des canaux, des voies ferrées, des trams ? Non. Une nouvelle autoroute. [...] [less ▲]

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See detailDarwin: required performance (invited)
Absil, Olivier ULg

Scientific conference (2007, December 06)

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See detailFrom the numerisation of the Soil Map of Wallonia to a real information and management tool
Legrain, Xavier ULg; Bah, Boubacar Billo ULg; Veron, Philippe et al

Poster (2007, December 05)

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See detailNulling interferometry: performance comparison between Antarctica and other ground-based sites
Absil, Olivier ULg; Coudé Du Foresto, V.; Barillot, M. et al

in Astronomy and Astrophysics (2007), 475

Context: Detecting the presence of circumstellar dust around nearby solar-type main sequence stars is an important pre-requisite for the design of future life-finding space missions such as ESA's Darwin ... [more ▼]

Context: Detecting the presence of circumstellar dust around nearby solar-type main sequence stars is an important pre-requisite for the design of future life-finding space missions such as ESA's Darwin or NASA's Terrestrial Planet Finder (TPF). The high Antarctic plateau may provide appropriate conditions to perform such a survey from the ground. Aims: We investigate the performance of a nulling interferometer optimised for the detection of exozodiacal discs at Dome C, on the high Antarctic plateau, and compare it to the expected performance of similar instruments at temperate sites. Methods: Based on the currently available measurements of the atmospheric turbulence characteristics at Dome C, we adapt the GENIEsim software (Absil et al. 2006, A&A, 448, 787) to simulate the performance of a nulling interferometer on the high Antarctic plateau. To feed a realistic instrumental configuration into the simulator, we propose a conceptual design for ALADDIN, the Antarctic L-band Astrophysics Discovery Demonstrator for Interferometric Nulling. We assume that this instrument can be placed above the 30-m thick boundary layer, where most of the atmospheric turbulence originates. Results: We show that an optimised nulling interferometer operating on a pair of 1-m class telescopes located 30 m above the ground could achieve a better sensitivity than a similar instrument working with two 8-m class telescopes at a temperate site such as Cerro Paranal. The detection of circumstellar discs about 20 times as dense as our local zodiacal cloud seems within reach for typical Darwin/TPF targets in an integration time of a few hours. Moreover, the exceptional turbulence conditions significantly relax the requirements on real-time control loops, which has favourable consequences on the feasibility of the nulling instrument. Conclusions: The perspectives for high dynamic range, high angular resolution infrared astronomy on the high Antarctic plateau look very promising. [less ▲]

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See detailDetermination du profil en acides gras du lait par spectroscopie moyen infrarouge.
Dehareng, Frédéric; Soyeurt, Hélène ULg; Veselko, Didier et al

in 14 emes Recontres autour des recherches sur les ruminants, Paris, les 5et 6 Decembre 2007 (2007, December 01)

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See detailTitan airglow spectra from Cassini Ultraviolet Imaging Spectrograph (UVIS): EUV analysis
Ajello, Joseph M.; Stevens, Michael H.; Stewart, Ian et al

in Geophysical Research Letters (2007), 34

We present the first UV airglow observations of Titan's atmosphere by the Ultraviolet Imaging Spectrograph (UVIS) on Cassini. Using one spectral channel in the EUV from 561-1182 Å and one in the FUV from ... [more ▼]

We present the first UV airglow observations of Titan's atmosphere by the Ultraviolet Imaging Spectrograph (UVIS) on Cassini. Using one spectral channel in the EUV from 561-1182 Å and one in the FUV from 1115-1913 Å, UVIS observed the disk on 13 December, 2004 at low solar activity. The EUV spectrum consists of three band systems of N[SUB]2[/SUB] (b [SUP]1[/SUP]∏[SUB]u[/SUB], b' [SUP]1[/SUP]∑[SUB]u[/SUB] [SUP]+[/SUP], c[SUB]4[/SUB]' [SUP]1[/SUP]∑[SUB]u[/SUB] [SUP]+[/SUP] -> X [SUP]1[/SUP]∑[SUB]g[/SUB] [SUP]+[/SUP]), while the FUV spectrum consists of one (a [SUP]1[/SUP]∏[SUB]g[/SUB] -> X [SUP]1[/SUP]∑[SUB]g[/SUB] [SUP]+[/SUP]). Both the EUV and FUV spectra contain many N I and N II multiplets that are produced primarily by photodissociative ionization. Spectral intensities of the N[SUB]2[/SUB] c[SUB]4[/SUB]' [SUP]1[/SUP]∑[SUB]u[/SUB] [SUP]+[/SUP](v' = 0) -> X [SUP]1[/SUP]∑[SUB]g[/SUB] [SUP]+[/SUP](v'' = 0-2) progression from 950-1010 Å are resolved for the first time. The UVIS observations reveal that the c[SUB]4[/SUB]' [SUP]1[/SUP]∑[SUB]u[/SUB] [SUP]+[/SUP](0) -> X [SUP]1[/SUP]∑[SUB]g[/SUB] [SUP]+[/SUP] (0) vibrational band near 958 Å is weak and undetectable, and that N I multiplets near 953.2 and 964.5 Å are present instead. Magnetospheric particle excitation may be weak or sporadic, since the nightside EUV spectrum on this orbit shows no observable nitrogen emission features and only H Ly-β. [less ▲]

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See detailCharacterization of the hot Neptune GJ 436 b with Spitzer and ground-based observations
Demory, B*-O; Gillon, Michaël ULg; Barman, T. et al

in Astronomy and Astrophysics (2007), 475

We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ 436 b. The observations were obtained using the 8-mum band of the InfraRed Array Camera (IRAC). The data ... [more ▼]

We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ 436 b. The observations were obtained using the 8-mum band of the InfraRed Array Camera (IRAC). The data spanning the predicted time of secondary eclipse show a clear flux decrement with the expected shape and duration. The observed eclipse depth of 0.58 mmag allows us to estimate a blackbody brightness temperature of T[SUB]p[/SUB] = 717 ± 35 K at 8 mum. We compare this infrared flux measurement to a model of the planetary thermal emission, and show that this model reproduces properly the observed flux decrement. The timing of the secondary eclipse confirms the non-zero orbital eccentricity of the planet, while also increasing its precision (e = 0.14 ± 0.01). Additional new spectroscopic and photometric observations allow us to estimate the rotational period of the star and to assess the potential presence of another planet. Our final secondary eclipse, photometric and Ca II H+K index time series are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/475/1125 [less ▲]

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2007)

Comète 17P/Holmes; Mars dort-il ?; Du neuf sur l'effet de serre sur Mars et Vénus; Mars Express sonde les dépôts les plus insolites de la Planète Rouge; I Zwicky 18; Un petit disque au coeur de la fourmi ... [more ▼]

Comète 17P/Holmes; Mars dort-il ?; Du neuf sur l'effet de serre sur Mars et Vénus; Mars Express sonde les dépôts les plus insolites de la Planète Rouge; I Zwicky 18; Un petit disque au coeur de la fourmi; A la recherche des quasars manquants; Galaxies en interaction; Existe-t-il des galaxies sans étoiles? [less ▲]

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See detailRadial Velocities and Atmospheric Parameters of Field Stars Suitable for RAVE Tests
Valentini, Marica ULg; Munari, U.; Tantalo, R. et al

in From Stars to Galaxies: Building the Pieces to Build Up the Universe (2007, December 01)

With the Asiago 1.82m telescope + Echelle spectrograph we have obtained high resolution spectra of 25 RAVE targets well distributed in atmospheric parameters. From them we have derived radial velocities ... [more ▼]

With the Asiago 1.82m telescope + Echelle spectrograph we have obtained high resolution spectra of 25 RAVE targets well distributed in atmospheric parameters. From them we have derived radial velocities and T_{eff}, log g, [M/H], V_{rot} sin i to the aim of serving as an external test for corresponding values derived from RAVE spectra. [less ▲]

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See detailARCS: the Asiago Red Clump Spectroscopic Survey
Valentini, Marica ULg; Barbon, R.; Munari, U. et al

in From Stars to Galaxies: Building the Pieces to Build Up the Universe (2007, December 01)

The Asiago Red Clump Spectroscopic survey derives from high resolution optical spectra accurate multi-epoch radial velocities and atmospheric parameters (T_{eff}, log g, [M/H], V_{rot}sin i, [α/Fe], ξ ... [more ▼]

The Asiago Red Clump Spectroscopic survey derives from high resolution optical spectra accurate multi-epoch radial velocities and atmospheric parameters (T_{eff}, log g, [M/H], V_{rot}sin i, [α/Fe], ξ) for a well selected sample of ˜500 equatorial Red Clump stars belonging to the solar neighborhood. These results coupled with astrometric and photometric external data are used in investigation of galactic structure and dynamics. [less ▲]

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See detailRising Sea Levels threatens the Nile Delta
Attia, Shady ULg

in 'scape : The International Magazine of Landscape Architecture and Urbanism (2007), 2

Like many other deltas, Egypt is particularly vulnerable to the effects of global warming. A relative rise in sea-level of 1 m would submerge much of the delta region within 30 km of the coast during the ... [more ▼]

Like many other deltas, Egypt is particularly vulnerable to the effects of global warming. A relative rise in sea-level of 1 m would submerge much of the delta region within 30 km of the coast during the next 100 years. Rising sea levels would have significant long-term impacts on physical, biological and socio-economic conditions of the Nile Delta. These include the damage and destruction of buildings near beaches, erosion of beaches, salt-water intrusion, and flooding more than 1,200 km2 of Egypt’s Delta Coastline. [less ▲]

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See detailLe financement public des cultes et de la laïcité
Husson, Jean-François ULg

in Politique : Revue de Débats (2007), (52), 14-17

This article summarizes the public financing of religious and philosophical communities in Belgium. It discusses the way theses means are shared and the future of this model.

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See detailIdentités et capital social en Wallonie
Italiano, Patrick ULg; Fontaine, Sébastien ULg; Pieters, Jérôme ULg et al

Report (2007)

Le rapport analyse les résultats d'une enquête en face à face en Wallonie et à Bruxelles sur les identités (belge, wallonne, européenne), le capital social (confiance, insertion sociale, participation ... [more ▼]

Le rapport analyse les résultats d'une enquête en face à face en Wallonie et à Bruxelles sur les identités (belge, wallonne, européenne), le capital social (confiance, insertion sociale, participation associative), la satisfaction quant à différents domaines de vie et le sentiment de sécurité. [less ▲]

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See detailAtelier 1: la démarche expérimentale comme référent externe à l'autorité du professeur ... ou quand le bruit et l'action sont synonymes d'apprentissage et de compétences...
Hindryckx, Marie-Noëlle ULg; Daussogne, Christine

in Puzzle (2007), (23), 28-29

Comment mener une démarche expérimentale en classe de sciences. Mise en situation concrète du public pour dégager des pistes de réponses aux questions suivantes: que fait-on en classe lorsqu'on ... [more ▼]

Comment mener une démarche expérimentale en classe de sciences. Mise en situation concrète du public pour dégager des pistes de réponses aux questions suivantes: que fait-on en classe lorsqu'on expérimente? Quel est le rôle de l'élève? Celui du professeur? Quels sont les avantages de travailler de la sorte? Qui fait "Autorité" dans tout cela?... Réflexions étayées par des résultats de recherche-action au fondamental [less ▲]

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See detailLabor et Complexe, c'est fini
Habrand, Tanguy ULg

Article for general public (2007)

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See detailUn label pour la librairie indépendante
Habrand, Tanguy ULg

Article for general public (2007)

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See detailLa circonscription fédérale : un placebo administré à un malade incurable?
Bouhon, Frédéric ULg

E-print/Working paper (2007)

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See detailEtude comparative des performances de production laitiere de brebis de race Mouton Laitier Belge avec celles de brebis de race Lacaune.
Gillon, Alain ULg; Rondia, Pierre; Gengler, Nicolas ULg et al

in 14ièmes Recontres Recherches Ruminants, Paris, les 5 et 6 Décembre 2007 (2007, December)

La Wallonie compte une dizaine de producteurs de lait de brebis avec un cheptel variant de 30 à 250 individus par exploitation, pour la plupart de race « Mouton Laitier Belge » (MLB). Il s’agit d’un ... [more ▼]

La Wallonie compte une dizaine de producteurs de lait de brebis avec un cheptel variant de 30 à 250 individus par exploitation, pour la plupart de race « Mouton Laitier Belge » (MLB). Il s’agit d’un animal de type exclusivement laitier qui s’apparente fortement au mouton laitier frison dont l’effectif s’élève à un millier de têtes. La présence simultanée de brebis Lacaune (LAC) et de brebis MLB sur une même exploitation a permis la comparaison de leurs performances respectives grâce à une maîtrise du facteur « mode de conduite ». L’effectif restreint des populations étudiées constitue une limite à une extrapolation des résultats à l’ensemble des individus des races concernées mais donne néanmoins une certaine indication de leur potentiel de production respectif en région wallonne. [less ▲]

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See detailPredatory boreholes in Tournaisian (Lower Carboniferous) spiriferid brachiopods
Mottequin, Bernard ULg; Sevastopulo, George

in Budd, G. E.; Streng, M.; Daley, A. C. (Eds.) et al Programme with abstracts of the 51st Palaeontological Association Annual Meeting (2007, December)

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