References of "2012"
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See detailTrusting the source as far as it can be trusted: al-Maqrīzī and the Mongol book of laws (Yāsah)
Bauden, Frédéric ULiege

Scientific conference (2012, April 03)

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See detailÉduCoP case study: the Community of Practice of learners in Educational Sciences at the University of Liège.
Denis, Brigitte ULiege; Bomgart, Marie-Laure ULiege

in Hodgson; Jones, C; de Laat, J (Eds.) et al Proceedings of the Eighth International Conference on Networked Learning 2012 (2012, April 03)

The concept of Community of Practice (CoP) takes nowadays a great part in the formal or informal learning domain. In addition, computerised tools are often used to sustain the activities of these ... [more ▼]

The concept of Community of Practice (CoP) takes nowadays a great part in the formal or informal learning domain. In addition, computerised tools are often used to sustain the activities of these communities (Wenger, White & Smith, 2009). The ÉduCoP case study deals with the creation and the animation process of a CoP that was launched in 2010 at the University of Liège. Initiated by a master student in educational sciences, it aims at developing and making durable a community of practice composed of learners in this field and supported by Information and Communication Technologies. This paper presents several actions undertaken to develop this CoP: the analysis of the potential members' needs, stakes and motivations of students to enrol in this project; the choice of useful and usable technological tools to provide them (here, the eGroupWare platform) and the training sessions linked to its efficient uses; the activities conducted to develop the CoP's members identity and to lead them to debate about common topics, to produce and share resources. The CoP's evolution was observed through qualitative and quantitative data collection processes (e.g. interviews about the members' implication and roles, support from animator, obstacles, feeling to belong to a CoP, analysis of the topics presented in the posted documents and messages, uses of the technological tools, frequency of connection...). The results are discussed here and perspectives are evoked for this CoP. If the actions undertaken show encouraging results, neverthless obstacles to the creation and the evolution of such a CoP have been identified (e.g. lack of technological culture among some members, reluctance to share personal productions). Some perspectives are considered to overcome these problems. Since October 2011, this initiative has been recognised at the institutional level: the university is interested in lessons learned in order to implement CoP into other faculties that would be willing to start networking and create communities of learners or of practice. [less ▲]

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See detailLa querelle territoriale entre Samos et Priène : réponse à une invitation au débat
Famerie, Etienne ULiege

Scientific conference (2012, April 03)

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See detail"The Other Half of the Sun": Ideology in Chimamanda Ngozi Adichie's Half of a Yellow Sun
Tunca, Daria ULiege

Conference (2012, April 03)

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See detailNanotechnologies. Qu'est devenu le principe de précaution?
Thoreau, François ULiege; Feltz, Bernard

Article for general public (2012)

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See detailSimuler la ressource forestière à l'échelle d'un massif : application de SIMMEM et GYMNOS
Ligot, Gauthier ULiege; Vallet, Patrick; Perin, Jérôme ULiege et al

Conference (2012, April 02)

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See detailQuels modes de gouvernance pour la PMI tunisienne? Les enseignements de la littérature
Ghorbel, Jihene ULiege; Van Caillie, Didier ULiege

Conference (2012, April 02)

Les Petites et Moyennes Entreprises (PME), et tout particulièrement les Petites et Moyennes Industries (PMI), constituent un des piliers de l’économie tunisienne. Néanmoins, malgré l’abondance des études ... [more ▼]

Les Petites et Moyennes Entreprises (PME), et tout particulièrement les Petites et Moyennes Industries (PMI), constituent un des piliers de l’économie tunisienne. Néanmoins, malgré l’abondance des études consacrées aux PME dans le monde, rares sont les recherches scientifiques qui portent sur les spécificités des PME industrielles dans ce contexte géographique donné. Simultanément, face au phénomène de mondialisation croissante de l'économie et aux crises économiques et financières qui marquent la vie économique mondiale en cette première décennie du nouveau millénaire, un consensus émerge dans la littérature conduisant au constat que les PME et les PMI doivent impérativement renforcer et améliorer à la fois leurs systèmes de contrôle et de gouvernance si elles veulent jouer un rôle majeur dans leur tissu économique respectif et si elles souhaitent consolider leur crédibilité auprès de l'ensemble de leurs partenaires externes (banquiers, Pouvoirs Publics, organes de contrôle externes, ...). Notre contribution se propose dès lors, à partir d’une analyse de la littérature relativement limitée spécifique à l'objet de recherche particulier que constitue la PMI tunisienne, de mettre en évidence les spécificités de la PMI tunisienne et ses conséquences sur le design d'un système de gouvernance qui permettrait d'asseoir leur crédibilité et donc leur assise dans le paysage économique tunisien. [less ▲]

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See detailLes dysphasies : sémiologie et hypothèses explicatives
Maillart, Christelle ULiege

Conference given outside the academic context (2012)

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See detailInstitutional Change and Legislative Stability: Explicit and Contested Decision-Making in the EU Council (1995-2010)
Van Aken, Wim ULiege

E-print/Working paper (2012)

In contrast to general expectations the growth of EU membership as well as European treaty reform has not had any significant impact on the Council’s overall legislative and roll call activity. On the ... [more ▼]

In contrast to general expectations the growth of EU membership as well as European treaty reform has not had any significant impact on the Council’s overall legislative and roll call activity. On the basis of a new dataset representing the total population of public roll calls and recorded votes in the Council this paper explains why the EU Council has been so successful in guaranteeing legislative and roll call stability between 1995 and 2010. The quantitative and qualitative analysis finds that frontloading legislation, changing voting behaviour, reinforcement of existing coalition patterns and the successful adjustment of newer Member States to the EU Council have contributed to the EU Council’s decision-making capacity during the observed 16 years. In explaining the apparent contradiction between institutional change and the Council’s legislative stability this paper contributes to our knowledge of the functioning, the decision-making processes and the geography of contestation in the EU Council. [less ▲]

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See detailDimension Reduction and Measure Transformation in Stochastic Multiphysics Modeling
Arnst, Maarten ULiege; Ghanem, Roger; Phipps, Eric et al

Conference (2012, April 02)

We present a computational framework based on stochastic expansion methods for the efficient propagation of uncertainties through multiphysics models. The framework leverages an adaptation of the Karhunen ... [more ▼]

We present a computational framework based on stochastic expansion methods for the efficient propagation of uncertainties through multiphysics models. The framework leverages an adaptation of the Karhunen-Loeve decomposition to extract a low-dimensional representation of information passed from component to component in a stochastic coupled model. After a measure transformation, the reduced-dimensional interface thus created enables a more efficient solution in a reduced-dimensional space. We demonstrate the proposed approach on an illustration problem from nuclear engineering [less ▲]

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See detailStochastic Dimension Reduction Techniques for Uncertainty Quantification of Multiphysics Systems
Phipps, Eric; Arnst, Maarten ULiege; Constantine, Paul et al

Conference (2012, April 02)

Uncertainty quantification of multiphysics systems represents numerous mathematical and computational challenges. Indeed, uncertainties that arise in each physics in a fully coupled system must be ... [more ▼]

Uncertainty quantification of multiphysics systems represents numerous mathematical and computational challenges. Indeed, uncertainties that arise in each physics in a fully coupled system must be captured throughout the whole system, the so-called curse of dimensionality. We present techniques for mitigating the curse of dimensionality in network-coupled multiphysics systems by using the structure of the network to transform uncertainty representations as they pass between components. Examples from the simulation of nuclear power plants will be discussed. [less ▲]

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See detailThree quasi-stellar objects acting as strong gravitational lenses
Courbin, F.; Faure, C.; Djorgovski, S. G. et al

in Astronomy and Astrophysics (2012), 540

We report the discovery of three new cases of quasi-stellar objects (QSOs) acting as strong gravitational lenses on background emission line galaxies: SDSS J0827+5224 (z[SUB]QSO[/SUB] = 0.293, z[SUB]s ... [more ▼]

We report the discovery of three new cases of quasi-stellar objects (QSOs) acting as strong gravitational lenses on background emission line galaxies: SDSS J0827+5224 (z[SUB]QSO[/SUB] = 0.293, z[SUB]s[/SUB] = 0.412), SDSS J0919+2720 (z[SUB]QSO[/SUB] = 0.209, z[SUB]s[/SUB] = 0.558), SDSS J1005+4016 (z[SUB]QSO[/SUB] = 0.230, z[SUB]s[/SUB] = 0.441). The selection was carried out using a sample of 22,298 SDSS spectra displaying at least four emission lines at a redshift beyond that of the foreground QSO. The lensing nature is confirmed from Keck imaging and spectroscopy, as well as from HST/WFC3 imaging in the F475W and F814W filters. Two of the QSOs have face-on spiral host galaxies and the third is a QSO+galaxy pair. The velocity dispersion of the host galaxies, inferred from simple lens modeling, is between σ = 210 and 285 km s[SUP]-1[/SUP], making these host galaxies comparable in mass with the SLACS sample of early-type strong lenses. Based on data obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. Also based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #GO12233. [less ▲]

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See detailDes racines au faîte : Hubert Nyssen romancier
Durand, Pascal ULiege

in Bon-A-Tirer : Revue Littéraire en Ligne (2012), 156

Aspects esthétiques et politiques de l'imaginaire romanesque d'Hubert Nyssen, par ailleurs fondateur des éditions Actes Sud.

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See detailEvidence for a physically bound third component in HD 150136
Mahy, Laurent ULiege; Gosset, Eric ULiege; Sana, H et al

in Astronomy and Astrophysics (2012), 540

Context. HD 150136 is one of the nearest systems harbouring an O3 star. Although this system was considered for a long time as a binary, more recent investigations have suggested the possible existence of ... [more ▼]

Context. HD 150136 is one of the nearest systems harbouring an O3 star. Although this system was considered for a long time as a binary, more recent investigations have suggested the possible existence of a third component. <BR /> Aims: We present a detailed analysis of HD 150136 to test its triple nature. In addition, we investigate the physical properties of the individual components of this system. <BR /> Methods: We analysed high-resolution, high signal-to-noise data collected through multi-epoch runs spread over ten years. We applied a disentangling program to refine the radial velocities and to obtain the individual spectra of each star. With the radial velocities, we computed the orbital solution of the inner system, and we describe the main properties of the orbit of the outer star such as the preliminary mass ratio, the eccentricity, and the orbital-period range. With the individual spectra, we determined the stellar parameters of each star by means of the CMFGEN atmosphere code. <BR /> Results: We offer clear evidence that HD 150136 is a triple system composed of an O3V((f[SUP]∗[/SUP]))-3.5V((f[SUP]+[/SUP])), an O5.5-6V((f)), and an O6.5-7V((f)) star. The three stars are between 0-3 Myr old. We derive dynamical masses of about 64, 40, and 35 M[SUB]&sun;[/SUB] for the primary, the secondary and the third components by assuming an inclination of 49° (sin[SUP]3[/SUP]i = 0.43). It currently corresponds to one of the most massive systems in our galaxy. The third star moves with a period in the range of 2950 to 5500 d on an outer orbit with an eccentricity of at least 0.3. However, because of the long orbital period, our dataset is not sufficient to constrain the orbital solution of the tertiary component with high accuracy. <BR /> Conclusions: We confirm there is a tertiary star in the spectrum of HD 150136 and show that it is physically bound to the inner binary system. This discovery makes HD 150136 the first confirmed triple system with an O3 primary star. Table 1 is available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A> [less ▲]

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See detailRossiter-McLaughlin effect measurements for WASP-16, WASP-25 and WASP-31★
Brown, D J A; Cameron, A Collier; Anderson, D R et al

in Monthly Notices of the Royal Astronomical Society (2012)

We present new measurements of the Rossiter-McLaughlin (RM) effect for three Wide Angle Search for transiting Planets (WASP) planetary systems, WASP-16, WASP-25 and WASP-31, from a combined analysis of ... [more ▼]

We present new measurements of the Rossiter-McLaughlin (RM) effect for three Wide Angle Search for transiting Planets (WASP) planetary systems, WASP-16, WASP-25 and WASP-31, from a combined analysis of their complete sets of photometric and spectroscopic data. We find a low-amplitude RM effect for WASP-16 (T[SUB]eff[/SUB]= 5700 ± 150 K), suggesting that the star is a slow rotator and thus of an advanced age, and obtain a projected alignment angle of ?. For WASP-25 (T[SUB]eff[/SUB]= 5750 ± 100 K), we detect a projected spin-orbit angle of λ= 14°.6 ± 6°.7. WASP-31 (T[SUB]eff[/SUB]= 6300 ± 100 K) is found to be well aligned, with a projected spin-orbit angle of λ= 2°.8 ± 3°.1. A circular orbit is consistent with the data for all three systems, in agreement with their respective discovery papers. We consider the results for these systems in the context of the ensemble of RM measurements made to date. We find that whilst WASP-16 fits the hypothesis of Winn et al. that 'cool' stars (T[SUB]eff[/SUB] < 6250 K) are preferentially aligned, WASP-31 has little impact on the proposed trend. We bring the total distribution of the true spin-orbit alignment angle, ψ, up to date, noting that recent results have improved the agreement with the theory of Fabrycky & Tremaine at mid-range angles. We also suggest a new test for judging misalignment using the Bayesian information criterion, according to which WASP-25 b's orbit should be considered to be aligned. [less ▲]

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See detailDivision IV / Working Group on Massive Stars
Puls, Joachim; Leitherer, Claus; Owocki, Stan et al

in Transactions of the International Astronomical Union, Series B (2012), 28

Our Working Group (WG) studies massive, luminous stars, both individually and in resolved and unresolved populations, with historical focus on early-type (OB) stars, A-supergiants, and Wolf-Rayet stars ... [more ▼]

Our Working Group (WG) studies massive, luminous stars, both individually and in resolved and unresolved populations, with historical focus on early-type (OB) stars, A-supergiants, and Wolf-Rayet stars. Our group also studies lower mass stars (e.g., central stars of planetary nebulae and their winds) which display features similar or related to those present in massive stars, and thus may improve our understanding of the physical processes occurring in massive stars. In recent years, massive red supergiants that evolve from hot stars have been included into our activities as well. We emphasize the role of massive stars in other branches of astrophysics, particularly regarding the First Stars, long duration Gamma-Ray bursts, formation of massive stars and their feedback on star formation in general, pulsations of massive stars, and starburst galaxies. [less ▲]

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See detailGlobal Modeling of X-Ray Spectra Produced in O-type Star Winds
Hervé, Anthony ULiege; Rauw, Grégor ULiege; Nazé, Yaël ULiege et al

in Astrophysical Journal (2012), 748

High-resolution X-ray spectra of O-type stars revealed less wind absorption than expected from smooth winds with conventional mass-loss rates. Various solutions have been proposed, including porous winds ... [more ▼]

High-resolution X-ray spectra of O-type stars revealed less wind absorption than expected from smooth winds with conventional mass-loss rates. Various solutions have been proposed, including porous winds, optically thick clumps, or an overall reduction of the mass-loss rates. The latter has a strong impact on the evolution of the star. Our final goal is to analyze high-resolution X-ray spectra of O-type stars with a multi-temperature plasma model in order to determine crucial stellar and wind parameters such as the mass-loss rate, the CNO abundances, and the X-ray temperature plasma distribution in the wind. In this context we are developing a modeling tool to calculate synthetic X-ray spectra. We present here the main ingredients and physics necessary for such a work. Our code uses the most recent version of the AtomDB emissivities to compute the intrinsic emissivity of the hot plasma as well as the CMFGEN model atmosphere code to evaluate the opacity of the cool wind. Following the comparison between two formalisms of stellar wind fragmentation, we introduce, for the first time in X-rays, the effects of a tenuous inter-clump medium. We then explore the quantitative impact of different model parameters on the X-ray spectra such as the position in the wind of the X-ray emitting plasma. For the first time, we also show that the two formalisms of stellar wind fragmentation yield different results, although the differences for individual lines are small and can probably not be tested with the current generation of X-ray telescopes. As an illustration of our method, we compare various synthetic line profiles to the observed O VIII λ18.97 line in the spectrum of ζ Puppis. We illustrate how different combinations of parameters can actually lead to the same morphology of a single line, underlining the need to analyze the whole spectrum in a consistent way when attempting to constrain the parameters of the wind. [less ▲]

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