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See detailLes formes de dysphasies : classifications actuelles et réflexions
Maillart, Christelle ULg

Conference given outside the academic context (2012)

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See detailOn being enrolled as an "embedded humanist" with nanotechnologists
Thoreau, François ULg

Conference (2012, January 13)

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See detailEvaluation et axes de rééducation des troubles articulatoires et phonologiques
Maillart, Christelle ULg

Conference given outside the academic context (2012)

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See detailEvidence-based Practice et dysphasie
Maillart, Christelle ULg

Conference given outside the academic context (2012)

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See detailFirst evidence of pulsations in Vega?. Results of today's most extensive spectroscopic search
Böhm, T.; Lignières, F.; Wade, G. et al

in Astronomy and Astrophysics (2012), 537

Context. The impact of rapid rotation on stellar evolution theory remains poorly understood as of today. Vega is a special object in this context as spectroscopic and interferometric studies have shown ... [more ▼]

Context. The impact of rapid rotation on stellar evolution theory remains poorly understood as of today. Vega is a special object in this context as spectroscopic and interferometric studies have shown that it is a rapid rotator seen nearly pole one, a rare orientation particularly interesting for seismic studies. In this paper, we present a first systematic search for pulsations in Vega. <BR /> Aims: The goal of the present work is to detect for the first time pulsations in a rapidly rotating star seen nearly pole-on. <BR /> Methods: Vega was monitored in quasi-continuous high-resolution echelle spectroscopy. A total of 4478 spectra were obtained. More precisely in 2008 we obtained 1213 spectra during 19.9 h on 3 nights (26th, 27th and 29th of July 2008) with NARVAL/TBL (at R = 65 000 and R = 75 000), in 2009 we obtained 1293 spectra during 13.7 h on 3 nights (9th-11th of September 2009) with ESPaDOnS/CFHT (at R = 68 000) and in 2010 we gathered again 1972 with NARVAL/TBL during 28.8 h on five nights (July 15th-19th). This data set should represent the most extensive high S/N, high resolution quasi-continuous survey obtained on Vega as of today. Least square deconvolved (LSD) profiles were obtained for each spectrum representing the photospheric absorption profile potentially deformed by the presence of pulsations. In addition, we calculated for each spectrum a telluric line LSD profile subsequently used as radial velocity reference. LSD profile centroids were adjusted and velocity differences (stellar-telluric) determined. These residual velocities were analysed and periodic low amplitude variations, potentially indicative of stellar pulsations, detected. In a subsequent step, the temporal line profile variations during the longest (2010) data set was calculated for each individual velocity bin of 1.8 km s[SUP]-1[/SUP] by computing a 2D (velocity-frequency) Lomb-Scargle periodogram. <BR /> Results: Based on high resolution echelle spectroscopy, we have obtained indications of periodic variations of very small amplitudes within the residual radial velocity curves of Vega. All three data sets revealed the presence of residual periodic variations: 5.32 and 9.19 d[SUP]-1[/SUP] (A ≈ 6 m s[SUP]-1[/SUP]) in 2008, 12.71 and 13.25 d[SUP]-1[/SUP] (A ≈ 8 m s[SUP]-1[/SUP]) in 2009 and 5.42 and 10.82 d[SUP]-1[/SUP] (A ≈ 3-4 m s[SUP]-1[/SUP]) in 2010. However, it is too early to conclude that the variations are due to stellar pulsations, and a confirmation of the detection with a highly stable spectrograph is a necessary next step. <BR /> Conclusions: If pulsations are confirmed, their very small amplitudes show that the star would belong to a category of very "quiet" pulsators. Based on observations obtained at the Bernard Lyot Telescope (TBL, Pic du Midi, France) of the Midi-Pyrénées Observatory, which is operated by the Institut National des Sciences de l'Univers (INSU) of the Centre National de la Recherche Scientifique of France (CNRS), and at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, INSU/CNRS and the University of Hawaii. [less ▲]

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See detailQuels modèles de mesure pour l’évaluation des compétences ?
Burton, Réginald; Flieller, André; Frenette, Eric et al

Conference (2012, January 12)

De plus en plus de dispositifs d’évaluation (évaluation formative, monitoring, épreuves d’orientation scolaire, …) ont recours aux Modèles de Réponse à l’Item pour estimer les compétences scolaires des ... [more ▼]

De plus en plus de dispositifs d’évaluation (évaluation formative, monitoring, épreuves d’orientation scolaire, …) ont recours aux Modèles de Réponse à l’Item pour estimer les compétences scolaires des élèves au départ de tests papier-crayon ou d’épreuves proposées sur ordinateur. Ces modèles de mesure – dont les propriétés laissaient entrevoir des progrès et des avantages considérables – se sont d’abord imposés comme standards de référence dans les enquêtes internationales pour être ensuite transposés dans des contextes locaux, notamment pour l’évaluation externe des compétences des élèves. Cependant, la technicité des MRI, leur nature stochastique et leurs composantes statistiques relativement complexes n’ont pas toujours permis une approche cartésienne et prudente de leur exploitation. On a cru pendant longtemps que la transposition de ces modèles à l’évaluation des compétences était naturelle et ne souffrait d’aucun obstacle fondamental. Mais les objectifs, les caractéristiques et les exigences de l’évaluation des compétences sont parfois bien éloignés des préoccupations internationales. Nous nous proposons donc, au départ des résultats empiriques et/ou des réflexions théoriques des intervenants de la table ronde, de déterminer dans quelles conditions l’application des MRI à l’évaluation des compétences est pertinente? Dans cette perspective, plusieurs critères d’analyse seront envisagés : la nature théorique des modèles (les MRI sont-ils adaptés pour atteindre les objectifs des dispositifs d’évaluation des compétences?), les caractéristiques psychométriques des évaluations (les conditions d’application des MRI sont-elles toujours remplies dans le cadre des évaluations de compétences?) et les méthodes de validation des modèles (les méthodes pour évaluer l’adéquation des modèles sont-elles adaptées à l’évaluation des compétences?). Pour ne pas conclure, les intervenants s’interrogeront sur l’opportunité de développer de nouveaux modèles de mesure pour l’évaluation des compétences. Trois questions principales structureront les échanges : Question 1: Quelles sont les caractéristiques psychométriques des dispositifs d’évaluation des compétences ? Question 2: Les Modèles de Réponse à l’Item sont-ils adaptés pour évaluer les compétences ? Question 3: Est-il opportun de développer de nouveaux modèles pour l’évaluation des compétences ? Si oui, quelles devraient en être les caractéristiques ? [less ▲]

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See detailConclusions de la journée d'étude "Socialisation et création littéraire"
Saint-Amand, Denis ULg; Lahire, Bernard

Conference (2012, January 12)

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See detailThat's not my job! Job control, safety citizenship and safety violations.
Chmiel, Nik; Hansez, Isabelle ULg

Conference (2012, January 12)

Detailed reference viewed: 12 (2 ULg)
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See detailGeoelectrical investigations (DC) on a contaminated site during biostimulation: monitoring results and resolution analysis
Caterina, David ULg; Nguyen, Frédéric ULg

Conference (2012, January 12)

In Belgium, as in many other countries, relatively anarchic economical and industrial development of the past century has resulted in a significant number of contaminated sites. When one of these sites ... [more ▼]

In Belgium, as in many other countries, relatively anarchic economical and industrial development of the past century has resulted in a significant number of contaminated sites. When one of these sites poses a risk to human or ecosystem, measures need to be taken to clean it up. Among these measures, methods using in situ bioremediation are beginning to become more important because of their ease of implementation and their relatively low cost. However, it is often difficult to ensure their effectiveness except by carrying out extensive drilling and sampling, which can be long and expensive while offering only punctual information. Thus, it becomes necessary to use other techniques to overcome these shortcomings. Recently, an increasing interest is being born to use geophysical methods as tools for remediation monitoring. As part of our work, we conducted several electrical resistivity tomography campaigns on a bus station located in Bassenge (Belgium) which has undergone a contamination of hydrocarbons (gasoline) for several years and on which a biostimulation remediation device was set up in order to clean it up. The aim of our investigations was to study the electrical response of the contaminated area during the remediation phase and whether electrical resistivity tomography allowed to monitor its effectiveness. After a year of monitoring, the time lapse images obtained show a significant decrease of electrical resistivities (up to -40%) during biostimulation at the location of the main contaminant plume and an increase again of resistivities from the time the biostimulation was stopped. The electrical response during the biostimulation is in agreement with the models presented by several authors in the literature. The increase again of resistivities after the stimulation is however more surprising and can be explained by several physico-chemical (sorption-desorption processes) or biological (decrease of conductive biofilms) assumptions. The results obtained tend to suggest that it is possible to use electrical resistivity tomography as a tool for qualitative control during the remediation of a contaminated site. However, for a more quantitative use of resistivity models, it is important to assess their reliability through the use of resolution indicators. We therefore developed a methodology to address this issue based on the creation of synthetic models representing simplified cases of field resistivities and we applied it on our case study. The results obtained provided us important information about the reliable parts of the resistivity models. These findings may lead in the future to the development of mathematical models that can link quantitatively geophysical properties to the level of (de)contamination of a site. [less ▲]

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See detailUpdate on laboratory diagnosis of acute viral gastroenteritis.
HUYNEN, Pascale ULg

Conference (2012, January 12)

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See detailgender issues in ISRD survey
Gavray, Claire ULg

Conference (2012, January 11)

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See detailAbiotic and biotic control of methanol exchanges in a temperate mixed forest
Laffineur, Quentin ULg; Aubinet, Marc ULg; Schoon, N. et al

in Atmospheric Chemistry and Physics (2012), 12

Methanol exchanges over a mixed temperate forest in the Belgian Ardennes were measured for more than one vegetation season using disjunct eddy-covariance by a mass scanning technique and Proton Transfer ... [more ▼]

Methanol exchanges over a mixed temperate forest in the Belgian Ardennes were measured for more than one vegetation season using disjunct eddy-covariance by a mass scanning technique and Proton Transfer Reaction Mass Spectrometry (PTR-MS). Half-hourly methanol fluxes were measured in the range of −0.6 μgm−2 s−1 to 0.6 μgm−2 s−1, and net daily methanol fluxes were generally negative in summer and autumn and positive in spring. On average, the negative fluxes dominated (i.e. the site behaved as a net sink), in contrast to what had been found in previous studies. An original model describing the adsorption/desorption of methanol in water films present in the forest ecosystem and the methanol degradation process was developed. Its calibration, based on field measurements, predicted a mean methanol degradation rate of −0.0074 μgm−2 s−1 and a half lifetime for methanol in water films of 57.4 h. Biogenic emissions dominated the exchange only in spring, with a standard emission factor of 0.76 μgm−2 s−1. The great ability of the model to reproduce the long-term evolution, as well as the diurnal variation of the fluxes, suggests that the adsorption/desorption and degradation processes play an important role in the global methanol budget. This result underlines the need to conduct long-term measurements in order to accurately capture these processes and to better estimate methanol fluxes at the ecosystem scale. [less ▲]

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See detailAuroral evidence of Io's control over the magnetosphere of Jupiter
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

in Geophysical Research Letters (2012), 39

Contrary to the case of the Earth, the main auroral oval on Jupiter is related to the breakdown of plasma corotation in the middle magnetosphere. Even if the root causes for the main auroral emissions are ... [more ▼]

Contrary to the case of the Earth, the main auroral oval on Jupiter is related to the breakdown of plasma corotation in the middle magnetosphere. Even if the root causes for the main auroral emissions are Io's volcanism and Jupiter's fast rotation, changes in the aurora could be attributed either to these internal factors or to fluctuations of the solar wind. Here we show multiple lines of evidence from the aurora for a major internally-controlled magnetospheric reconfiguration that took place in Spring 2007. Hubble Space Telescope far-UV images show that the main oval continuously expanded over a few months, engulfing the Ganymede footprint on its way. Simultaneously, there was an increased occurrence rate of large equatorward isolated auroral features attributed to injection of depleted flux tubes. Furthermore, the unique disappearance of the Io footprint on 6 June appears to be related to the exceptional equatorward migration of such a feature. The contemporary observation of the spectacular Tvashtar volcanic plume by the New-Horizons probe as well as direct measurement of increased Io plasma torus emissions suggest that these dramatic changes were triggered by Io's volcanic activity. [less ▲]

Detailed reference viewed: 30 (15 ULg)