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See detailPulsational analysis of the Herbig Ae star HD 140237
Fumel, Aurélie ULg; Böhm, Torsten

in Communications in Asteroseismology (2008), 157

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See detailA sharp look at the gravitationally lensed quasar SDSS J0806+2006 with laser guide star adaptive optics at the VLT
Sluse, Dominique ULg; Courbin, F.; Eigenbrod, A. et al

in Astronomy and Astrophysics (2008), 492

We present the first VLT near-IR observations of a gravitationally lensed quasar, using adaptive optics and laser guide star. These observations can be considered as a test bench for future systematic ... [more ▼]

We present the first VLT near-IR observations of a gravitationally lensed quasar, using adaptive optics and laser guide star. These observations can be considered as a test bench for future systematic observations of lensed quasars with adaptive optics, even when bright natural guide stars are not available in the nearby field. With only 14 min of observing time, we derived very accurate astrometry of the quasar images and of the lensing galaxy, with 0.05´´ spatial resolution, comparable to the Hubble Space Telescope (HST). In combination with deep VLT optical spectra of the quasar images, we use our adaptive optics images to constrain simple models for the mass distribution of the lensing galaxy. The latter is almost circular and does not need any strong external shear to fit the data. The time delay predicted for SDSS J0806+2006, assuming a singular isothermal ellipsoid model and the concordance cosmology, is Δ t ≃ 50 days. Our optical spectra indicate a flux ratio between the quasar images of A/B = 1.3 in the continuum and A/B = 2.2 in both the Mg ii and in the C iii] broad emission lines. This suggests that microlensing affects the continuum emission. However, the constant ratio between the two emission lines indicates that the broad emission line region is not microlensed. Finally, we see no evidence of reddening by dust in the lensing galaxy. Based on observations collected at the European Southern Observatory, Paranal, Chile, ESO Program 079.A-0588(A). [less ▲]

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See detailThe driving mechanism of roAp stars : effects of global metallicity
Theado, S.; Dupret, Marc-Antoine ULg; Noels-Grötsch, Arlette ULg

in Communications in Asteroseismology (2008), 157

We have investigated the influence of global metallicity on the excitation mechanism of roAp star pulsations. Our computations show that the opacity in the driving region of the roAp modes is strongly ... [more ▼]

We have investigated the influence of global metallicity on the excitation mechanism of roAp star pulsations. Our computations show that the opacity in the driving region of the roAp modes is strongly sensitive to the metal content but surprisingly the roAp theoretical instability strip is only weakly affected by metallicity changes. [less ▲]

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See detailModelling Uncertainties in the Climate of the Last Millennium: the ASTER Project
Loutre, M.; Mouchet, Anne ULg; Fichefet, T. et al

Poster (2008, December 01)

The LOVECLIM model (Driesschaert et al., 2007; Goosse et al., 2007) is used to simulate the climate of the last millennium with several 'climate' parameter sets yielding different sensitivities of the ... [more ▼]

The LOVECLIM model (Driesschaert et al., 2007; Goosse et al., 2007) is used to simulate the climate of the last millennium with several 'climate' parameter sets yielding different sensitivities of the climate and the carbon cycle model. The purpose of these simulations is twofold. We intend to assess first the role of the carbon cycle on the climate, and second, the ability of the different selected parameter sets to drive the model within the range of the observed climate, and further to assess the uncertainty related to these parameters. The high frequency variability of the forcings is taken into account. For each set of parameters, LOVECLIM is driven by the natural evolution of insolation, solar irradiance and stratospheric aerosol concentrations due to volcanic activity as well as by changes caused by human activities such as deforestation, CO2 emission or concentration changes, changes in concentrations of greenhouse gases other than CO2 (including ozone) and in sulphate aerosol load. Several transient experiments are conducted for each parameter set. A first transient simulation (CONC) is forced with reconstructed atmospheric CO2 concentration. In the next two simulations, the emissions of carbon are taken into account, the model computing the corresponding atmospheric CO2 concentration. First (EMIS), the emissions due both to the land use changes and the fossil fuel burning are provided. Second (EFOR), only the emissions from fossil fuel burning are provided in addition to the vegetation change related to deforestation. The Northern Hemisphere annual mean temperatures simulated by the model according to the different parameter sets and carbon cycle sensitivities do not show striking differences. The general pattern shows slightly warmer conditions in the early part of the simulation and cooler ones during the Little Ice Age. At last, the global warming of the last century is also clearly simulated. The response of the carbon cycle to the evolution of forcings over the last millennium does not differ much among experiments although there is a much larger spread when considering different emission scenarios (e.g. EFOR and EMIS). Sensitivity tests to the amplitude of the variation of the total solar irradiance (TSI) are performed; a very first quick look at the simulations does not show significant differences in the pattern of the simulated climate in response to modification in the TSI amplitude. Further analysis must be conducted. Climate response to different schemes of deforestation will also be presented. Driesschaert E., Fichefet T., Goosse H., Huybrechts P., Janssens I., Mouchet A., Munhoven G., Brovkin V., and Weber S. L., 2007. Modelling the influence of Greenland ice sheet melting on the Atlantic meridional overturning circulation during the next millennia. Geophys. Res. Lett., 34:L1070, 2007. Goosse H., Driesschaert E., Fichefet T., and Loutre M.F., 2007. Information on the early Holocene climate constrains the summer sea ice projections for the 21st century Clim. Past 3, 683-692. [less ▲]

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See detailLa révision pacifiste des manuels scolaires. Les enjeux de la mémoire de la guerre 14-18 dans l’enseignement belge de l’Entre-deux-guerres
Bechet, Christophe ULg

in Cahier d’Histoire du Temps présent (2008), (20), 49-101

Le choix fait par la Belgique d’intégrer après la Première Guerre mondiale les rangs des organisations internationales et la détente de ses rapports avec l’Allemagne à partir du traité de Locarno a mené ... [more ▼]

Le choix fait par la Belgique d’intégrer après la Première Guerre mondiale les rangs des organisations internationales et la détente de ses rapports avec l’Allemagne à partir du traité de Locarno a mené tout naturellement les autorités du pays à modérer progressivement leur rhétorique revancharde et à adopter un discours mêlant désormais subtilement nationalisme et internationalisme. La transposition de cette politique de compromis dans l’enseignement belge est un phénomène complexe que nous étudions dans cet article en nous attardant tout spécialement sur la mémoire de la guerre 14-18 dans les manuels scolaires et en étudiant ses enjeux au niveau politique, académique et pédagogique. Sur le plan politique, les circulaires ministérielles montrent que le gouvernement belge a accueilli favorablement la propagande pacifiste sans pour autant cesser toute propagande patriotique. Sur le plan académique, le rapport rédigé par le professeur de l’ULB Frans Van Kalken, au nom du Comité national belge des sciences historiques, en vue du Congrès international sur l’enseignement de l’histoire tenu à la Haye en 1932, montre bien les préventions des milieux historiques belges à l’égard des propositions avancées par les pédagogues ‘internationalistes’ pour la révision de l’histoire de la Première Guerre mondiale. Sur le plan pédagogique, la procédure de révision des manuels scolaires mise en place par la Société des Nations – procédure Casarès – n’aura porté ses fruits en Belgique qu’à une seule occasion. De même, malgré l’activisme des nombreuses organisations pacifistes gravitant dans l’orbite de la SDN, comme par exemple la dotation Carnegie pour la paix internationale, leur volonté de réviser, entre autres, la littérature scolaire belge va être confrontée au départ à une inertie de la part des auteurs de manuels, principalement du côté francophone. Les auteurs belges sont peu au fait des critiques internationales et les changements opérés dans leurs manuels après 1926, vraisemblablement à la suite des directives émanant du ministère des Sciences et des Arts, ne seront pas toujours à la mesure des espérances pacifistes. À ce titre, les difficultés inhérentes à la révision des manuels scolaires en Belgique illustrent parfaitement les spécificités de la mémoire belge relative à la Grande Guerre, peu adaptable aux canons de la nouvelle morale internationale. [less ▲]

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See detailFrom bouncing to boxing
Terwagne, Denis ULg; Gilet, Tristan ULg; Vandewalle, Nicolas ULg et al

in Chaos (2008), 18(4),

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See detailDéveloppement d’un outil de prédiction de la probabilité de réussite à l’insémination chez la vache laitière à partir des données du Contrôle Laitier
Laloux, Laurent; Bastin, Catherine ULg; Glorieux, Géry et al

in 15ème Rencontres Recherches Ruminants, Paris, les 3 et 4 décembre 2008 (2008, December)

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See detailFaire escale de dix ans
Habrand, Tanguy ULg

Article for general public (2008)

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See detailTowards an Improved Single-Frequency Ionospheric Correction: Focus on Mid-Latitudes
Bidaine, Benoît ULg; Warnant, René ULg

in 4th ESA Workshop on Satellite Navigation User Equipment Technologies NAVITEC (2008, December)

The modelling of the Total Electron Content (TEC) plays an important role in global satellite navigation systems (GNSS) accuracy, especially for single frequency receivers, the most common ones ... [more ▼]

The modelling of the Total Electron Content (TEC) plays an important role in global satellite navigation systems (GNSS) accuracy, especially for single frequency receivers, the most common ones constituting the mass market. For the latter and in the framework of Galileo, the NeQuick model has been chosen for correcting the ionospheric error contribution. It has been designed to calculate the electron density at a given point of the ionosphere according to the time conditions and the solar activity. This electron density can be integrated along the path from the receiver to the considered satellite to provide the TEC. For Galileo, a parameter Az (“effective ionisation level”) will be provided to the model as solar activity information and will be daily updated by the ground stations. In order to reach the ionosphere error correction level objective (70% or 20 TECu whichever is larger), the model itself as well as its use for Galileo are investigated. Different situations have to be considered: different latitude regions (space conditions), different hours, seasons and years (time conditions) and specific phenomena appearance (magnetic storms, Travelling Ionospheric Disturbances – TIDs). In addition the results can be compared to different data sets among which GPS slant or vertical TEC (sTEC or vTEC) measurements, Global Ionospheric Maps, ionosonde profiles, topside soundings but also other ionosphere models results such as IRI. In our comparison process, we take benefit of various ionosphere data from several European stations (Chilton in UK, Dourbes in Belgium, El Arenosillo and Roquetes in Spain, Pruhonice in Czech Republic) where ionosonde and GPS TEC data are available for different solar activity levels. These data allow us to study NeQuick representation of the ionosphere at mid-latitudes. We investigate the difference between GPS-derived vTEC and corresponding values from NeQuick for the latest years (between solar maximum in 2000 and minimum in 2007) in order to observe the temporal dependencies towards Universal Time, season and solar activity. On the one hand, we use ionosonde data to constrain the model so that we can concentrate on its formulation of the profile only. We especially highlight the improvements from the latest (second) version of NeQuick and show the critical importance of the topside formulation. On the other hand, we analyse the model residual errors for the same situations computing vTEC through the Galileo algorithm. [less ▲]

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See detailDevelopment of products for GNSS users at the Belgian Solar-Terrestrial Centre of Excellence
Warnant, René ULg; Lejeune, Sandrine; Stankov, Stanimir et al

Conference (2008, December)

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See detailSéparation de fait - Commentaire pratique. La sécurité sociale
Michiels, Olivier ULg

in Michiels, Olivier (Ed.) Séparation de fait - Commentaire pratique (2008)

L'auteur analyse les conséquences de la séparation de fait des époux sur les prestations de sécurité sociale

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See detail6-Substituted 2-Oxo-2h-1-Benzopyran-3-Carboxylic Acid Derivatives in a New Approach of the Treatment of Cancer Cell Invasion and Metastasis
Kempen, I.; Hemmer, Marc ULg; Counerotte, Stéphane ULg et al

in European Journal of Medicinal Chemistry (2008), 43(12), 2735-50

Novel 6-substituted 2-oxo-2H-1-benzopyran-3-carboxylic acid derivatives were synthesized and their potency in reducing the invasive behaviour of HT 1080 fibrosarcoma cells was evaluated. Structure ... [more ▼]

Novel 6-substituted 2-oxo-2H-1-benzopyran-3-carboxylic acid derivatives were synthesized and their potency in reducing the invasive behaviour of HT 1080 fibrosarcoma cells was evaluated. Structure-activity relationships were deduced from biological results and will be used in further design of new active compounds. In particular, the acetoxymethyl substituent found at the 6-position of previously described active compounds can be replaced by an acetamidomethyl substituent without loss of potency; while the presence of an aryl ester function at the 3-position was preferred to a thioester or an amide function to induce marked biological activity. This work confirms the interest of aryl esters of 6-substituted coumarin-3-carboxylic acids as potential new anti-cancer agents. [less ▲]

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See detailEcoTransHy, Rapport final de conclusions
Andre, Jean; Brac, Jean; de Wolf, Daniel ULg et al

Report (2008)

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See detailL'image du mois. Myofibrosarcome dufémur distal
Netten, Alexandre ULg; Kurth, William ULg

in Revue Médicale de Liège (2008), 63(12), 697-698

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See detailPour envisager différemment les analyses de situation
Grignard, Sophie ULg; Goudet, Bernard; Vandoorne, Chantal ULg

in Education Santé (2008), (240), 13-17

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See detailNorme(s) linguistique(s) et représentations des enseignants. Aperçu du traitement des 'écarts' linguistiques au cours de français
El Karouni, Salima; Collès, Luc; Lucchini, Silvia ULg

in Enjeux : Revue de Formation Continuée et de Didactique du Français (2008), 73

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