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See detailNanotechnologies. Qu'est devenu le principe de précaution?
Thoreau, François ULg; 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 ULg; Vallet, Patrick; Perin, Jérôme ULg 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 ULg; Van Caillie, Didier ULg

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 detailDamping rates of solar-like oscillations across the HR diagram. Theoretical calculations confronted to CoRoT and Kepler observations
Belkacem, K.; Dupret, Marc-Antoine ULg; Baudin, F. et al

in Astronomy and Astrophysics (2012), 540

The space-borne missions CoRoT and Kepler are providing a rich harvest of high-quality constraints on solar-like pulsators. Among the seismic parameters, mode damping rates remains poorly understood and ... [more ▼]

The space-borne missions CoRoT and Kepler are providing a rich harvest of high-quality constraints on solar-like pulsators. Among the seismic parameters, mode damping rates remains poorly understood and are thus barely used to infer the physical properties of stars. Nevertheless, thanks to the CoRoT and Kepler spacecrafts it is now possible to measure damping rates for hundreds of main-sequence and thousands of red-giant stars with unprecedented precision. By using a non-adiabatic pulsation code including a time-dependent convection treatment, we compute damping rates for stellar models that are representative of solar-like pulsators from the main-sequence to the red-giant phase. This allows us to reproduce the observations of both CoRoT and Kepler, which validates our modeling of mode damping rates and thus the underlying physical mechanisms included in the modeling. By considering the perturbations of turbulent pressure and entropy (including the perturbation of the dissipation rate of turbulent energy into heat) by the oscillation in our computation, we succeed in reproducing the observed relation between damping rates and effective temperature. Moreover, we discuss the physical reasons for mode damping rates to scale with effective temperature, as observationally exhibited. Finally, this opens the way for the use of mode damping rates to probe turbulent convection in solar-like stars. [less ▲]

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

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 detailCLUPI, a high-performance imaging system on the ESA-NASA rover of the 2018 ExoMars mission to discover biofabrics on Mars
Josset, J.-L.; Westall, F.; Hofmann, B. A. et al

in EGU General Assembly Conference Abstracts (2012, April 01)

The scientific objectives of the ESA-NASA rover of the 2018 mission of the ExoMars Programme are to search for traces of past or present life and to characterise the near-sub surface. Both objectives ... [more ▼]

The scientific objectives of the ESA-NASA rover of the 2018 mission of the ExoMars Programme are to search for traces of past or present life and to characterise the near-sub surface. Both objectives require study of the rock/regolith materials in terms of structure, textures, mineralogy, and elemental and organic composition. The 2018 rover ExoMars payload consists of a suite of complementary instruments designed to reach these objectives. CLUPI, the high-performance colour close up imager, on board the 2018 ESA-NASA Rover plays an important role in attaining the mission objectives: it is the equivalent of the hand lens that no geologist is without when undertaking field work. CLUPI is a powerful, highly integrated miniaturized (<700g) low-power robust imaging system, able to operate at very low temperatures (-120°C). CLUPI has a working distance from 10cm to infinite providing outstanding pictures with a color detector of 2652x1768. At 10cm, the resolution is 7 micrometer/pixel in color. The focus mechanism and the optical-mechanical interface are a smart assembly in titanium that can sustain a wide temperature range. The concept benefits from well-proven heritage: Proba, Rosetta, MarsExpress and Smart-1 missions… Because the main science objective of ExoMars concerns the search for life, whose traces on Mars are likely to be cryptic, close up observation of the rocks and granular regolith will be critical to the decision as whether to drill and sample the nearby underlying materials. Thus, CLUPI is the essential final step in the choice of drill site. But not only are CLUPI's observations of the rock outcrops important, but they also serve other purposes. CLUPI, could observe the placement of the drill head. It will also be able to observe the fines that come out of the drill hole, including any colour stratification linked to lithological changes with depth. Finally, CLUPI will provide detailed observation of the surface of the core drilled materials when they are in the sample drawer at a spatial resolution of 15 micrometer/pixel in color. The close-up imager CLUPI on the ESA-NASA rover of the 2018 mission will be described together with its capabilities to provide important information significantly contributing to the understanding of the geological environment and could identify outstanding potential biofabrics (stromatolites...) of past life on Mars. [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 detailMilk production of Holsteins under Mediterranean conditions: case of the Tunisian population
Ben Gara, Abderrahmen; Borni, Jemmali; Hammami, Hedi ULg et al

in Rekik, Boulbaba (Ed.) Milk Production (2012)

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See detailGlobal Modeling of X-Ray Spectra Produced in O-type Star Winds
Hervé, Anthony ULg; Rauw, Grégor ULg; Nazé, Yaël ULg 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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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 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 detailEvidence for a physically bound third component in HD 150136
Mahy, Laurent ULg; Gosset, Eric ULg; 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 detailThe optimization of microsatellite genotyping and genetic sexing of non-invasively collected polar bear tissue: Implications for monitoring and census.
Harris, Christopher; Van Coeverden De Groot, Peter; Kamookak, L et al

Conference (2012, April)

The monitoring of Polar Bears in Canada has been completed largely through management unit (MU) wide capture-mark-recapture (CMR) surveys. While this data is very useful at the time of collection, these ... [more ▼]

The monitoring of Polar Bears in Canada has been completed largely through management unit (MU) wide capture-mark-recapture (CMR) surveys. While this data is very useful at the time of collection, these surveys are expensive and take time to plan and execute; cannot be feasibly executed across the polar bear range at intervals that reflect the expected rapid environmental changes in the Arctic; and are disdained by the Inuit as being invasive. As part of recent efforts to explore less expensive and non-invasive methods to monitor polar bears (see Wong et al & Van Coevderden de Groot et al this conference) we are evaluating genetic information obtained from non-invasively collected polar bear tissue. In this work we report on the genetic data obtained from non-invasively collected harisnags recovered from sampling stations erected between May-June 2006-2009 in M’Clintock Channel, Nunavut. Across the 4 years 344 hair snags were collected; following Paetkau (2004) we optimized 6 microsatellite loci to reliably amplify polar bear DNA from this tissue and we modified the procedure of Pages et al (2009) to reliably genetically sex these tissues. Our estimates for two common errors with this type of tissue across all loci – allelic dropout (0.026) and false allele (0.03) - were both less than p =.05. This suggests these errors are not going to significantly affect the accuracy of the consensus genotypes collected from these data. Using consensus genotypes from relevant hairsnags, we posit a minimum of 59 (max 82) unique bears entered our sampling stations. Of these, 24% were female, 64% were male, and 12% could not be sexed. We resampled 2 bears in 2006, 1 in 2007, 0 bears in 2008 and 14 bears in 2009 – the 2009 value reflects significantly increased sampling effort in 2009. Five bears were re-sampled between the non-invasive surveys in 2006-2009. When comparing our data to a subset of cubs and subadults captured during the Taylor et al. (2006) CMR survey of M’Clintock Channel (MU), we found 6 genotype matches. Our sampling stations may have a male bias as the sex ratio from the 1998-2000 CMR study was 42.1% ♂ (Taylor et al 2006) vs. 64% ♂ (this study). We cannot accurately determine the age bias (but see Wong et al this conference). Genetic data from Polar bear faecal samples may provide an unbiased sex and age sample of polar bears in any MU. Any data from these samples will help refine hairsnag derived MKNA estimate of polar bears from any MU. Here we report on our efforts to genotype and genetically sex 95 faecals we have collected from M’Clintock Channel from 2006-2009. Finally, we discuss the implications of these findings, results from other noninvasive work (Wong et al & Van Coevderden de Groot et al this conference) and ongoing/proposed work in the context of i) a non-invasive Inuit-based polar bear activity and health survey, and ii) a more rigorous census method which may allow more precise adjustments of harvest levels than currently possible using infrequently collected CMR data only. [less ▲]

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See detailDiscrimination thresholds of the reverberation in large volumes by naïve listeners
Billon, Alexis ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the Acoustics 2012 Nantes conference (2012, April)

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See detailThe size and book-to-market effects revisited
Lambert, Marie ULg; Hübner, Georges ULg

E-print/Working paper (2012)

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See detailETAPE - Rapport d’évaluation des résultats
Vanmeerbeek, Marc ULg; Bednarek, Stéphanie; Lachaussée, Sophie et al

Report (2012)

Contexte et objectifs ETAPE est un programme d’intervention précoce à domicile au bénéfice de familles à risque de négligence parentale. Le programme prend en charge des enfants de 0 à 30 mois, ainsi que ... [more ▼]

Contexte et objectifs ETAPE est un programme d’intervention précoce à domicile au bénéfice de familles à risque de négligence parentale. Le programme prend en charge des enfants de 0 à 30 mois, ainsi que leurs parents, au rythme d’une à deux visites à domicile par semaine. L’intervention consiste en des massages du bébé, des jeux psychomoteurs. Un temps important est en outre consacré à l’accompagnement et à la guidance du rôle parental. L’originalité du projet est qu’il est centré sur le développement psychomoteur et affectif du bébé en lien avec son ou ses parents. L’étude cherche à mesurer l’efficacité du programme en termes de développement psychomoteur de l’enfant, de qualité d’attachement au sein de la dyade parent-enfant et de compétences éducatives des parents. Méthodologie Les aptitudes psychomotrices de l’enfant ont été mesurées au moyen du test de Brunet et Lézine modifié, au début, en milieu et en fin d’intervention. Le caractère sécure ou non de l’attachement a été mesuré chez le caregiver par Q-Sort en début et en fin d’intervention. Les compétences parentales ont été évaluées tous les six mois durant l’intervention au moyen d’un questionnaire développé par l’équipe de recherche en 2008 (MASPIN) et complété par les intervenants sur base de leurs observations. Résultats Douze enfants ont été étudiés. Les trois quarts ont été pris en charge avant 1 an ; la durée moyenne d’intervention est de 11,3 mois. En moyenne, les enfants gagnent nettement en score de développement moteur global, gagnent un peu en socialisation, sont stables en développement moteur fin. La plupart régressent au score de langage, ce qui influence négativement le score global de développement. Deux enfants sur douze sont sécures au début et à la fin de l’intervention (mais ce ne sont pas les mêmes). Aucun ne termine l’intervention significativement insécurisé, mais la relation dans la dyade n’est en général pas optimale. Les résultats de MASPIN permettent d’étoffer les autres résultats obtenus et de mieux comprendre l’évolution au cas par cas. Discussion Les résultats, mesurés par les tests de Brunet-Lézine et le Q-Sort semblent modestes dans certains domaines, mais doivent être analysés à la lumière des conditions d’intervention. MASPIN a donné une vue beaucoup plus précise de la réalité et de son évolution. Ce questionnaire a aussi permis de monitorer l’intervention. Toutefois, la finesse des observations et l’aspect subjectif de la cotation empêchent une analyse globale des résultats ; la fidélité intercotateur doit encore être validée. MASPIN permet en outre de donner des repères pour le dialogue avec d’autres professionnels impliqués dans le suivi des situations, et fournit un canevas qui facilite la discussion avec les familles sur l’exercice de la parentalité et les objectifs d’intervention. L’analyse des résultats permet de prendre conscience que certaines compétences (par ex., le langage) méritent d’être mieux soutenues et stimulées par les intervenants de terrain.) Des collaborations extérieures devront être développées (par ex : psychologue, aide sociale). L’investissement requis de la part des intervenants est important. Le risque de découragement est grand ; ils doivent être soutenus et supervisés de façon efficace dans ce travail. L’instauration d’un vrai esprit d’équipe est indispensable Conclusion Le rendement de ce programme, destiné à un public particulièrement difficile, est intéressant mais variable selon les situations prises en charge, que ce soit en termes de développement psychomoteur ou d’attachement à la figure parentale. L’outil MASPIN se révèle précieux dans de multiples aspects de la prise en charge, depuis le dialogue avec les professionnels qui identifient la situation, jusqu’au monitorage des objectifs au fil de l’intervention, en passant par la construction des objectifs d’intervention avec les parents. [less ▲]

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See detailToward a Taxonomy of Key Success Factors for SME’s in a Changing Environment : the case of the Luxury Industry
Riguelle, France ULg; Van Caillie, Didier ULg

in Proceedings of the The 12th IAMB Conference (2012, April)

This paper aims at proposing a synthetic taxonomy of key success factors (KSF) for SME's in the luxury industry. Both typologies of KSF for SME's in overall on the one hand, and for companies of the ... [more ▼]

This paper aims at proposing a synthetic taxonomy of key success factors (KSF) for SME's in the luxury industry. Both typologies of KSF for SME's in overall on the one hand, and for companies of the luxury industry on the other hand, constructed on a basis of a critical literature review regarding the two domains concerned (SME's performance management and performance management of companies of the luxury industry) are gathered to propose a single synthetic taxonomy of KSF for SME's of the luxury industry. [less ▲]

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See detailL’homme de lettres en personnage générique. La ‘‘sociologie-fiction’’ des Physiologies
Stienon, Valérie ULg

in Dozo, Björn-Olav; Glinoer, Anthony; Lacroix, Michel (Eds.) Imaginaires de la vie littéraire. Fiction, figuration, configuration (2012)

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See detailDynamique forestière et enrichissements forestiers. Site de Mbang. Rapport n° 8.
Doucet, Jean-Louis ULg; Amandé, Jean; Bracke, Charles et al

Report (2012)

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