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See detailGiving up the Ghosts: Diaspora and its Hereafter in “Once in a Lifetime” by Jhumpa Lahiri
Munos, Delphine ULg

Conference (2009, May 23)

In spite of diasporic subjectivity being recurrently conceptualised through a rhetoric of “fluidity,” “multiple affiliations” and “national non-attachment,” today’s literature of the Indian diaspora ... [more ▼]

In spite of diasporic subjectivity being recurrently conceptualised through a rhetoric of “fluidity,” “multiple affiliations” and “national non-attachment,” today’s literature of the Indian diaspora reveals that the “un-transnational” ideology of the return is still running deep in the first and second-generation migrant imaginary. Vijay Mishra’s recent attempt to explore the idea of “writing diaspora” in an analogy with writing trauma or writing mourning is illuminating in this respect, because it constitutes a theoretical framework able to bear witness to the maintenance of a diasporic imaginary structured by the loss of the Motherland, whether this loss involves firsthand experience of migration or originates from a “phantom loss” refigured by the second generation. Drawing on Mishra’s theorizing of the diasporic imaginary, my paper will explore Jhumpa Lahiri’s representation of the second generation’s “inheritance of loss” in “Once in a Lifetime,” the short-story opening Unaccustomed Earth’s trilogy. By narrating Hema’s and Kaushik’s parallel journey from childhood to early adulthood, Lahiri rewrites the notion of return as melancholic attachments through which the unsymbolizable gap left by the absence of the Motherland can be represented, renegotiated and perhaps then, put to rest. In my paper, I wish to show that not only does Lahiri use melancholy as a means of representing second-generation subjectivities haunted by impossible mourning and unclaimed legacies, but also that she rehabilitates the notion of return as a way of envisaging a diasporic future that is swarming with ghosts. In that sense, Lahiri illustrates that the notion of homeland and the trope of the return can also be associated with a promise of futurity. [less ▲]

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See detailThe European Union Implementation of Sustainable Development
Michel, Quentin ULg

Conference (2009, May 22)

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See detailBehaviour of Deep Reinforced Concrete Beams under Monotonic and Reversed Cyclic Loading
Mihaylov, Boyan ULg; Bentz, Evan; Collins, Michael

Conference (2009, May 22)

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See detailCe qui "nous" force à penser. Proust 1943-1964
Cormann, Grégory ULg

Conference (2009, May 22)

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See detailUse of the supercritical fluid technology to prepare efficient nanocomposite foams for environmental protection purpose
Urbanczyk, Laetitia ULg; Thomassin, Jean-Michel ULg; Huynen, Isabelle et al

Conference (2009, May 19)

This work reports on the preparation of novel nanocomposite foams that are efficient broadband microwave absorbers. Carbon nanotubes are first successfully dispersed into PCL and PMMA by melt blending ... [more ▼]

This work reports on the preparation of novel nanocomposite foams that are efficient broadband microwave absorbers. Carbon nanotubes are first successfully dispersed into PCL and PMMA by melt blending. Then, foaming is promoted by supercritical CO2 by depressurization. Regular cellular structures are obtained in both cases with cells size around 10-50µm. The electromagnetic interference (EMI) shielding efficiency of these materials are then evaluated and compared to the non-foamed nanocomposites. [less ▲]

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See detailInfluence function of the error rate of classification based on clustering
Ruwet, Christel ULg; Haesbroeck, Gentiane ULg

Conference (2009, May 19)

Cluster analysis may be performed when one wishes to group similar objects into a given number of clusters. Several algorithms are available in order to construct these clusters. In this talk, focus will ... [more ▼]

Cluster analysis may be performed when one wishes to group similar objects into a given number of clusters. Several algorithms are available in order to construct these clusters. In this talk, focus will be on two particular cases of the generalized k-means algorithm : the classical k-means procedure as well as the k-medoids algorithm, while the data of interest are assumed to come from an underlying population consisting of a mixture of two groups. Among the outputs of these clustering techniques, a classification rule is provided in order to classify the objects into one of the clusters. When classification is the main objective of the statistical analysis, performance is often measured by means of an error rate. Two types of error rates can be computed: a theoretical one and a more empirical one. The first one can be written as ER(F, Fm) where F is the distribution of the training sample used to set up the classification rule and Fm (model distribution) is the distribution under which the quality of the rule is assessed (via a test sample). The empirical error rate corresponds to ER(F, F), meaning that the classification rule is tested on the same sample as the one used to set up the rule. This talk will present the results concerning the theoretical error rate. In case there are some outliers in the data, the classification rule may be corrupted. Even if it is evaluated at the model distribution, the theoretical error rate may then be contaminated. To measure the robustness of classification based on clustering, influence functions have been computed. Similar results as those derived by Croux et al (2008) and Croux et al (2008) in discriminant analysis were observed. More specifically, under optimality (which happens when the model distribution is FN = 0.5 N(μ1, σ) + 0.5 N(μ2, σ), Qiu and Tamhane 2007), the contaminated error rate can never be smaller than the optimal value, resulting in a first order influence function identically equal to 0. Second order influence functions need then to be computed. When the optimality does not hold, the first order influence function of the theoretical error rate does not vanish anymore and shows that contamination may improve the error rate achieved under the non-optimal model. The first and, when required, second order influence functions of the theoretical error rate are useful in their own right to compare the robustness of the 2-means and 2-medoids classification procedures. They have also other applications. For example, they may be used to derive diagnostic tools in order to detect observations having an unduly large influence on the error rate. Also, under optimality, the second order influence function of the theoretical error rate can yield asymptotic relative classification efficiencies. [less ▲]

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See detailDevelopment of a small-scale scroll expander-based ORC
Quoilin, Sylvain ULg

Conference (2009, May 19)

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See detailExtending the job Demands-Resources Model : safety behaviour and perceived safety climate.
Hansez, Isabelle ULg; Chmiel, N.

Conference (2009, May 16)

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Peer Reviewed
See detailLes standards internationaux : la place des situations et des contextes
Lafontaine, Dominique ULg

Conference (2009, May 15)

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See detailLes principles de l’Eco-conception
Reiter, Sigrid ULg

Conference (2009, May 15)

Detailed reference viewed: 72 (11 ULg)
See detailA Systems Biology Approach to Apoptosis Signalling
Schliemann, Monica ULg; Scheurich, Peter; Bullinger, Eric ULg

Conference (2009, May 15)

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See detailLes stratégies wallonnes en matière de simplification administrative
Thoreau, François ULg

Conference (2009, May 15)

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See detailLa couleur des dehors dans les traités d’architecture français, XVIe-XVIIIe siècle
Gilles, Isabelle ULg

Conference (2009, May 15)

Témoin fondamental pour l’étude du bâti, le traité d’architecture constitue une source textuelle et iconographique, et plus généralement un document contextuel, qui détermine les règles de l’architecture ... [more ▼]

Témoin fondamental pour l’étude du bâti, le traité d’architecture constitue une source textuelle et iconographique, et plus généralement un document contextuel, qui détermine les règles de l’architecture dans ses dimensions les plus vastes : culturelles, sociales, économiques, techniques… Ainsi, dans le domaine de la « peinture d’impression », les auteurs nous livrent aussi bien des informations d’ordre technique (matières et mises en œuvre) que les usages d’une architecture pensée et écrite avec soin, dans laquelle chaque élément – et chaque couleur – occupe une place bien déterminée. Si la couleur des « dedans » prend naturellement le dessus dans une conception française de l’architecture qui a poussé au plus haut point l’art de la distribution, la couleur des « dehors » n’est néanmoins pas négligée. Aussi trouverons-nous dans les traités d’architecture les techniques et les usages qui conviennent aux « dehors » ; informations qui sont susceptibles de guider le restaurateur dans les choix d’intervention qu’il projette sur le bâti ancien. [less ▲]

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See detailEco-conception : exemples d'écoquartiers
Marique, Anne-Françoise ULg

Conference (2009, May 15)

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See detailConformational analysis of new 5-HT1A ligands by molecular modeling
Dilly, Sébastien ULg; Graulich, Amaury; Liégeois, Jean-François ULg

Conference (2009, May 14)

5-HT1A receptors represent a major target for research and drug development due to their involvement in pathologies such as anxiety,1 depression,2 sleep and memory disorders,3,4 and schizophrenia.5 The ... [more ▼]

5-HT1A receptors represent a major target for research and drug development due to their involvement in pathologies such as anxiety,1 depression,2 sleep and memory disorders,3,4 and schizophrenia.5 The main feature of many drugs having a 5-HT1A affinity is the presence of arylpiperazine moiety.6 Indeed, the protonated nitrogen and the aromatic ring of the arylpiperazine compounds are considered crucial for the interaction with the receptor.7 Interestingly, an in vitro binding study realized in our laboratory reveals the presence of the 1,2,3,6-tetrahydropyridine instead of the piperazine moiety in 4-arylpiperazine-ethyl carboxamide derivatives is highly favourable for 5-HT1A affinity. In order to better understand the favourable effect of this chemical modification, we have performed a conformational analysis of these compounds mainly based on the position of the phenyl ring relative to the piperazine and tetrahydropyridine ones. In the piperazine compounds, the phenyl ring is found in a perpendicular orientation, whereas an almost planar orientation seems to be the most favourable conformation for the tetrahydropyridine compounds (See figure). Therefore, the almost planar orientation of the 4-substituted phenyl ring appears as an important spatial requirement for an optimal interaction with the receptor binding site. This finding could lead to new ideas in the design of high-affinity 5-HT1A ligands. [less ▲]

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See detailNovel Stealthy Gd(III)-DOTA/polymer Conjugates for Magnetic Resonance Imaging (MRI)
Grogna, Mathurin ULg; Bémelmans, Stéphanie ULg; Vanasschen, Christian ULg et al

Conference (2009, May 14)

Magnetic resonance imaging (MRI) is a routine diagnostic tool in modern clinical medicine. MRI has many advantages as a diagnostic imaging modality. It is noninvasive, delivers no radiation, and has ... [more ▼]

Magnetic resonance imaging (MRI) is a routine diagnostic tool in modern clinical medicine. MRI has many advantages as a diagnostic imaging modality. It is noninvasive, delivers no radiation, and has excellent (submillimeter) spatial resolution. Some Gadolinium(III) complexes are commonly used to enhance the contrast between adjacent tissues when the resolution/sensitivity of MRI is too low. Because free Gd3+ is very toxic in doses required for MRI, Gd(III) is chelated by poly(amino-carboxylate) such as diethylenetriamine pentaacetic acid (DTPA) or 1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA). Although DTPA/Gd3+ and DOTA/Gd3+ are water soluble, they have a very short circulation lifetime in blood, a low molecular weight and a short rotational time that make the contrast poor. To enhance the contrast, the Gd3+/complex doses have to be increased. In order to increase the sensitivity of the technique, while not increasing the concentration of the contrast agent, we were investigating different strategies to improve (i) the circulation lifetime in blood, (ii) the relaxation rate of Gd(III) (and consequently, the contrasting efficiency) and (iii) the targeting of the contrast agent. This presentation aims at reporting how a multifunctional (co)polymer can be designed and exploited for improving the contrasting ability and bioavailability of gadolinium-based complexes. [less ▲]

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See detailTagging with leisure needs
Pestieau, Pierre ULg

Conference (2009, May 14)

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See detailSocial and private LTC insurance with variable altruism
Pestieau, Pierre ULg

Conference (2009, May 14)

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See detailTraitements des arthrites septiques chez le veau
Sartelet, Arnaud ULg; Touati, Kamal ULg

Conference (2009, May 14)

Detailed reference viewed: 319 (60 ULg)
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See detailTraitement des fractures chez les bovins
Sartelet, Arnaud ULg; Mulon, Pierre-Yves

Conference (2009, May 14)

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See detailLe Dossier Professionnel Réflexif (DPR) en didactique des Langues et littératures modernes à l'ULg : un outil pour développer l'esprit critique et l'autonomie des futurs enseignants
Simons, Germain ULg

Conference (2009, May 13)

Depuis l'année académique 2007-2008, le service de didactique des Langues et littératures modernes de l'ULg a introduit un Dossier Professionnel Réflexif (DPR) qui clôture la formation de l'AESS du Master ... [more ▼]

Depuis l'année académique 2007-2008, le service de didactique des Langues et littératures modernes de l'ULg a introduit un Dossier Professionnel Réflexif (DPR) qui clôture la formation de l'AESS du Master/à finalité didactique. Ce DPR, sorte de "portfolio", vise à amener les étudiants à prendre distance par rapport à leur formation, à s'auto-évaluer en tant que professeur-stagiaire, et à imaginer des pistes de solution afin de s'améliorer dans le futur. La présente communication décrit et commente le dispositif mis en place et fournit quelques éléments d'évaluation. [less ▲]

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See detailAdolescents délinquants sexuels : délinquance et sexualité de ces adolescents à la lumière de leur timing pubertaire .
Glowacz, Fabienne ULg

Conference (2009, May 12)

De nombreuses recherches ( Haynie 2006, Kaltiala-Heino 2003, Parent, 2003, Beaver 2005, Lynne 2007,..) ont établi ces dernières années un lien entre le développement pubertaire et l’engagement dans des ... [more ▼]

De nombreuses recherches ( Haynie 2006, Kaltiala-Heino 2003, Parent, 2003, Beaver 2005, Lynne 2007,..) ont établi ces dernières années un lien entre le développement pubertaire et l’engagement dans des comportements délictueux, usage de drogue, conduites sexuelles et autres comportements exploratoires et déviants. Felson et Haynie (2002) affirment que le développement pubertaire a des effets sur différents types de délinquance, comparables à d’autres puissants prédicteurs de la délinquance. Bien que l’étude de Williams et Dunlop (1999) constate que les garçons à maturité précoce et tardive présentent des taux plus élevés de délinquance que leurs pairs à maturation normale, des recherches plus récentes (Ge 2002, Beaver 2005, Michaud 2006, Lynne 2007)…) soutiennent l’hypothèse de la précocité pubertaire en tant que facteur de risque : les garçons à puberté précoce ont un plus haut niveau d’engagement dans des comportements délinquants, agressifs et sexuels, alors que les garçons à puberté tardive s’engagent dans moins de délinquances (de type crime, violence, atteintes aux biens, usage de drogue et sexualité). Tous les auteurs reconnaissent la complexité des interactions entre facteurs biologiques et psychosociaux, et des liens entre puberté-comportements. La délinquance sexuelle juvénile, au croisement de la délinquance et de la sexualité, ne peut se dispenser d’un questionnement sur le développement pubertaire de ces adolescents . Dans le cadre de notre recherche « Adolescence, délinquances et processus pubertaires », nous avons évalué le timing pubertaire de 47 adolescents ayant commis une agression sexuelle que nous avons comparé à celui d’adolescents délinquants non sexuels (N=20) et d’adolescents non délinquants (N=249). Nos analyses confirment la pertinence de la prise en compte du développement pubertaire de l’adolescent et de ses répercussions psychologiques et sociales dans l’étude des conduites sexuelles délinquantes des adolescents. Les résultats reflètent une surreprésentation de « pubertés décalées » (avancées ou retardées) parmi les adolescents délinquants sexuels comparativement aux adolescents non délinquants, ainsi que des spécificités de la délinquance sexuelle par rapport à d’autres type délinquances. Ces résultats seront discutés dans une perspective biopsychosociale au travers d’une analyse des interactions entre timing pubertaire et socialisation, perception de soi et agressivité des adolescents délinquants sexuels. [less ▲]

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See detailObserver l’écoute : du paradoxe à l’enquête
Colon, Paul-Louis ULg

Conference (2009, May 11)

La communication faisait un état critique des techniques d'observation de la perception auditive qui tiennent compte de sa dimension sociale et culturelle.

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See detailHow much more Economics is the New Approach ?
Sibony, Anne-Lise ULg

Conference (2009, May 11)

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See detailModélisation de l’ionosphère pour les utilisateurs Galileo simple fréquence
Bidaine, Benoît ULg

Conference (2009, May 11)

Detailed reference viewed: 83 (24 ULg)
See detailLe lac Kivu: bilan des connaissances scientifiques et gestion de ses ressources
Darchambeau, François ULg; Descy, Jean-Pierre

Conference (2009, May 08)

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Peer Reviewed
See detailLe droit de la distribution
Petit, Nicolas ULg

Conference (2009, May 08)

Detailed reference viewed: 26 (4 ULg)
See detailL’état des stocks de poissons pélagiques : nouvelles évaluations par écho-sondages
Guillard, Jean; Darchambeau, François ULg

Conference (2009, May 08)

Detailed reference viewed: 8 (0 ULg)
See detailBiodegradable polymers-based nanofibers by electrospinning
Jérôme, Christine ULg

Conference (2009, May 07)

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See detailThéorie par l'exemple, théorie de l'exemple. À propos de Palimpsestes
Stienon, Valérie ULg

Conference (2009, May)

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See detailUne solution numérique au test de Cattell pour déterminer le nombre de composantes principales à retenir
Raîche, Gilles; Magis, David ULg; Walls, Ted et al

Conference (2009, May)

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See detailDiagnostic et traitement des troubles de la mobilité laryngée
FINCK, Camille ULg

Conference (2009, May)

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See detailImplementation of an active school project in a rural environment in Wallonia. A collaborative study
Cloes, Marc ULg; Dequenne, Aurélie

Conference (2009, May)

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See detailLes identités, filtre d'interprétation et d'action dans le cadre des réformes de l'administration publique ?
Rondeaux, Giseline ULg

Conference (2009, May)

Un changement planifié majeur tel qu’une réforme entraîne une transformation de multiples aspects de l’organisation : ses modes d’organisation, sa politique de GRH, ses stratégies, sa manière de concevoir ... [more ▼]

Un changement planifié majeur tel qu’une réforme entraîne une transformation de multiples aspects de l’organisation : ses modes d’organisation, sa politique de GRH, ses stratégies, sa manière de concevoir et de remplir ses missions, ses structures, ses valeurs, ses systèmes et réseaux, ses référents, etc. Cette transformation suppose la valorisation de modes de fonctionnement, de valeurs et de compétences différents, et a pour résultat un bouleversement de l’identité organisationnelle (plurielle et complexe) et des identités professionnelles des membres de cette organisation. Nous proposons, dans cette communication, de nous centrer sur la notion d’identité organisationnelle, définie comme la réponse à la question « qui sommes-nous en tant qu’organisation ? ». Ainsi, l’identité organisationnelle correspond à des moments dans l’histoire de l’organisation, des stades aisément identifiables (état stable, central et distinctif) (Albert et Whetten, 1985). L’analyse du contexte (discours et notes de politique générale, textes « fondateurs », plans et dispositifs de gestion) permet en effet de distinguer assez clairement les changements de ligne stratégique et, in fine, des orientations dans la définition de l’identité organisationnelle, au fil du temps. Dans cette perspective, une réforme peut être considérée comme un projet identitaire dans la mesure où elle propose une redéfinition de ce "qui sommes-nous ?". Telle est notamment la position de Du Gay (1996), selon lequel le New Public Management constitue un projet identitaire, en ce qu’il vise à redéfinir la main d’œuvre. Toutefois, l’identité organisationnelle ne peut être considérée comme une dimension monolithique. Chaque stade est en effet marqué par différentes interactions (différentes logiques identitaires dont certaines prédominent d’autres à certains moments). En effet, même si au sein d’une identité organisationnelle, une logique identitaire particulière semble prévaloir, d’autres logiques identitaires sont néanmoins présentes, ou apparaissent, sur un mode plus minoritaire. L’identité organisationnelle se conçoit donc comme hybride, composée d’une logique identitaire dominante et de logiques identitaires « secondaires ». Ainsi que le notent Meyer et Hammerschmit, « as different institutional logics entail different social identities with diverging positions, we can expect the process in which prevalent institutional logics are challenged or replaced to be contested and struggles over the legitimacy of a new orientation to take place » (2006: 1001). En d’autres termes, la logique identitaire dominante est celle qui est enactée (au sens de réalisée, mise en œuvre) et donc décelable dans l’identité organisationnelle. Les autres logiques identitaires sont présentes dans l’organisation, mais sur un mode minoritaire. Au moyen d’une démarche qualitative longitudinale menée durant deux ans dans un ministère fédéral belge, nous proposons une typologie des logiques et profils identitaires. La méthodologie mise en œuvre a consisté en deux séries d’interviews (10 interviews de contexte auprès d’acteurs clés de l’organisation, et 27 interviews d’identité, encadrés par un questionnaire semi-ouvert, auprès d’un échantillon diversifié), menés à 12-18 mois d’intervalle. A partir des données récoltées, nous avons procédé à une analyse de contenu et une analyse de terminologie. Nous distinguons trois grandes logiques identitaires, de manière archétypale, qui s’apparentent aux tendances pointées dans la littérature sous les termes « Service Public» pour l’une d’entre elles, soit les représentations, principes et valeurs traditionnellement associées à l’administration, et « Managérialisme Public» pour la deuxième logique, soit les principes, valeurs et représentations liés au courant du New Public Management. La troisième logique identitaire que nous avons décelée par ailleurs, est désignée sous le terme de « Pragmatisme ». Elle se constitue d’une combinaison des principes, valeurs et représentations des deux logiques précédentes, marquée par un degré de « dogmatisme » moins prononcé. En d’autres termes, les porteurs de cette troisième logique semblent s’attacher davantage aux réalisations tangibles et aux résultats, bref à l’action plutôt qu’à des principes et valeurs en tant que tels. Par ailleurs, la confrontation de la logique identitaire avec la perception du contexte peut conduire soit à une situation de congruence (par analogie avec les travaux de Rogers, 1951), dans laquelle la perception du contexte apparaît comme en continuité avec la logique identitaire, soit à une situation de dissonance (Festinger, 1965), faisant référence à une rupture entre les principes identitaires des individus, la logique identitaire qu’ils adoptent (comprise comme ensemble de croyances et de valeurs reliées entre elles et partagées par une communauté), et leur perception de la réalité (du contexte). Cette seconde partie de notre raisonnement nous mène à la notion de profil identitaire. Cette notion peut se définir comme la manière dont chacune des logiques identitaires interagit avec le contexte. Nous distinguons ainsi 7 profils identitaires : les invariants, les nostalgiques, les pragmatiques et pragmatiques dissonants, les professionnels, les désabusés et les démobilisés. Chacun de ces profils sera détaillé, en précisant notamment quelles sont leurs facteurs de dissonance et d’évolution. Ces différents éléments tendent à confirmer l’existence d’une hybridation du contexte (différentes logiques identitaires en présence, évolution des identités organisationnelles proposées à différents moments) et des acteurs (différentes perceptions du contexte, différents facteurs individuels de positionnement, différents profils identitaires). En conséquence, l’hypothèse qui charpente l’ensemble de notre réflexion est celle d’une co-structuration du contexte de l’administration publique dans le cadre de changements (réforme, mouvement de modernisation) et des identités : les réformes modifient en partie les identités, mais celles-ci façonnent également le cours des réformes. Cette co-structuration se traduit concrètement à différents niveaux d’appréhension, du plus global (spécificité du secteur public, ethos des fonctionnaires) au plus micro (niveau de l’individu), en passant par les niveaux intermédiaires que sont les niveaux organisationnel et professionnel. Notre approche longitudinale révèle par ailleurs les dynamiques identitaires, en identifiant notamment les processus de shift d’un profil à l’autre, et nous conduit à proposer un modèle des dynamiques identitaires contextualisé. L’identité constitue-t-elle un frein ou un levier pour le changement ? A l’instar de la culture d’entreprise, l’identité peut être appréhendée selon deux angles différents : d’une part, elle peut être considérée comme un facteur de cohésion (Hogg et Terry, 2000), de création de sens lors d’un changement (Salk et Shenkar, 2001) et, in fine, une source d’innovation et un avantage concurrentiel (Fiol, 1991, 2001). D’autre part, elle peut être assimilée à un facteur de stabilité organisationnelle (voire d’inertie) et de reproduction de l’existant. Dans cette deuxième perspective, l’identité organisationnelle serait alors un obstacle à la nécessaire évolution de toute organisation (Whetten et Godfrey, 1998). L’identité serait ainsi, en d’autres termes, facteur de résistance au changement (Reger et al., 1994), notamment si ce dernier est perçu comme cause d’éloignement des missions de base historiques de l’organisation (Kletz, 2002). Les résultats de notre analyse mettent en évidence l’ampleur des obstacles que les problématiques identitaires peuvent constituer face au changement. Ils font également apparaître des leviers potentiels de changement. Dans la mesure où ils auront pu être identifiés, ces éléments peuvent ultérieurement constituer une base pour le développement d’une approche, de méthodes voire d’outils relatifs à la gestion du changement : utiliser les identités organisationnelles comme indicateur clé voire comme levier de changement. [less ▲]

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See detailAirglow and aurora
Gérard, Jean-Claude ULg

Conference (2009, May)

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See detailThe ontogenetic dynamic of skull shape disparity in damselfishes (Pomacentridae)
Frederich, Bruno ULg; Vandewalle, Pierre ULg

Conference (2009, May)

Damselfishes (Pomacentridae) are among the most speciose of coral-reef fishes, with > 350 species world-wide, most of which live on coral reefs. They have a life history with two distinct phases: a ... [more ▼]

Damselfishes (Pomacentridae) are among the most speciose of coral-reef fishes, with > 350 species world-wide, most of which live on coral reefs. They have a life history with two distinct phases: a dispersive pelagic larval phase and a sedentary benthic adult phase. The larval stage ends at coral reef settlement. All larvae feed on planktonic preys whereas juveniles and adults associated to the coral reef show a higher diversity of diets: zooplanktivorous, herbivorous, coral polyp feeders and omnivorous species. Morphological disparity is a major theme in paleobiology. Most studies of disparity have focused on its temporal dynamics over a geological time scale. Surprisingly, the relationship between ontogeny and disparity has received little attention. Using landmark-based geometric morphometrics, this study aims to test the hypothesis that the ontogenetic change in diet is related to an increase of shape disparity in head skeletal units (neurocranium, suspensorium + opercle, mandible and premaxilla) during the post-settlement growth in eight species of damselfishes. At the end of the larval stage (coral reef settlement), all skeletal units are already species-specific. By comparing levels of shape disparity between species at three developmental stages (at settlement, at 60 mm SL and at maximum adult body size), we found that disparity increases significantly during ontogeny. The ontogenies of shape were also compared to identify evolutionary changes in developmental processes modifying shape disparity. The ontogenetic patterns are highly divergent among species. At least, evolutionary changes affected three parameters of ontogenetic trajectories of shape in this group: (1) the allometric patterns (the direction in which the vector representing the ontogeny of shape point), (2) the amount of change undergone during the post-settlement phase and (3) the rate of shape changes. From a functional point of view, the ontogenetic transformations enhance suction-feeding and/or algae scraping (e.g. heightening of the suspensorium and opercle, shortening of the mandible). [less ▲]

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See detailComparison of O2 IR and NO UV night airglow variations on Mars and Venus
Brecht; Bougher, S. W.; Gérard, Jean-Claude ULg et al

Conference (2009, May)

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See detailDynamic Hedge Fund Style Analysis with Errors-in-Variables
Bodson, Laurent ULg

Conference (2009, May)

This paper revisits the traditional return-based style analysis (RBSA) in presence of time-varying exposures and errors-in-variables (EIV). We first apply a selection algorithm using the Kalman filter to ... [more ▼]

This paper revisits the traditional return-based style analysis (RBSA) in presence of time-varying exposures and errors-in-variables (EIV). We first apply a selection algorithm using the Kalman filter to identify the more appropriate benchmarks for the analyzed fund return. Then, we compute their corresponding higher moment estimated errors-in-variables, i.e. the measurement error series introducing the (cross) moments of order three and four. We adjust the selected benchmarks by subtracting their higher moments estimated EIV from the initial return series, to obtain an estimate of the true uncontaminated benchmarks. We finally run the Kalman filter on these adjusted regressors. Analyzing EDHEC alternative indexes styles, we show that this technique improves the factor loadings and permits to identify more precisely the return sources of the considered hedge fund strategy. [less ▲]

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See detailA drop of spectroscopy
Terwagne, Denis ULg; Gilet, Tristan ULg; Vandewalle, Nicolas ULg et al

Conference (2009, May)

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See detailENZYMATIC INTERESTERIFICATION OF PALM OIL AND FRACTIONS
Gibon, Véronique; Danthine, Sabine ULg; De Clercq, Nathalie et al

Conference (2009, May)

Detailed reference viewed: 13 (1 ULg)
See detailDecoherence-enhanced measurements
Braun, Daniel; Martin, John ULg

Conference (2009, May)

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See detailMeasuring positive and negative aspects of well-being at work: Intern and extern validity of the PNOSI.
Barbier, Marie ULg; Hansez, Isabelle ULg

Conference (2009, May)

With the emergence of positive psychology, research interest in workers positive responses to work conditions has gained ground fast. In the beginning of the 21st century, our unit developed the PNOSI, a ... [more ▼]

With the emergence of positive psychology, research interest in workers positive responses to work conditions has gained ground fast. In the beginning of the 21st century, our unit developed the PNOSI, a new tool for measuring Positive and Negative Occupational Stress. Negative occupational stress was defined as the response of workers facing demands they feel they have to manage but for which they doubt necessary resources are available. Positive occupational stress was defined as the response of workers facing demands they feel they have to manage and for which they perceive necessary resources are available. Exploratory analyses (Barbier & Hansez, 2008) have identified a two-factor structure, one measuring Positive Occupational Stress (POSI) and the other measuring Negative Occupational Stress (NOSI). The following research has two goals: establishing PNOSI intern structure through a cross-validation strategy using calibration and validation samples (goal 1), and testing its convergent and discriminant validity (goal 2). As regards to goal 1, structural equation modelling using Lisrel 8.80 was performed on 2,713 data collected in a Belgian electricity company. Results show that the two-factor solution suits data best than an alternative one “wellbeing” factor solution. Moreover, eliminating two items leads to better fit. We then fitted this reduced two-factor structure on more than 15,000 data collected in six companies. Results show that the reduced two-factor solution should be preferred to the alternative one in all six samples. PNOSI intern structure is thus replicated. As regards to goal 2, we calculated correlations between NOSI and POSI scales, and constructs of burnout, engagement, workaholism and commitment. Data were collected in a Belgian public institution (N = 954). NOSI was moderately correlated to our burnout measure, and can thus be considered as a different, even if related, construct. POSI was highly correlated to our measure of engagement, challenging our hypothesis that the two are different constructs. Finally, NOSI was moderately and negatively correlated to commitment and positively correlated to workaholism, whereas the reverse was true for POSI. It seems thus that NOSI is distinct from burnout, workaholism and commitment, whereas POSI is distinct from workaholism and commitment. To conclude, we can say that PNOSI two-factor structure is established. NOSI shows convergent validity with the similar construct of burnout, but is distinct from it. Results are less clear concerning POSI and engagement. Finally, NOSI and POSI are differently related to constructs of commitment and workaholism; their discriminant validity is thus established. [less ▲]

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See detailBiogeochemical changes in the North Pacific in response to a shut down of the Atlantic meridional overturning
Menviel, L.; Timmermann, A.; Timm, O. et al

Conference (2009, May)

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See detailA test of the Job Demands-Resources model with alternative measures of strain and well-being
Barbier, Marie ULg; Hansez, Isabelle ULg

Conference (2009, May)

Since the beginning of the 21st century, the Job Demands-Resources model (Demerouti, Bakker, Nachreiner & Schaufeli, 2001) has given rise to numerous studies aimed at a better understanding of positive ... [more ▼]

Since the beginning of the 21st century, the Job Demands-Resources model (Demerouti, Bakker, Nachreiner & Schaufeli, 2001) has given rise to numerous studies aimed at a better understanding of positive and negative aspects of wellbeing at work. The existence of a motivational and an energetic process leading to, respectively, engagement and strain has been demonstrated several times, as well as cross-links between the two. However, these studies mainly rely on two measurement tools: the MBI-GS as a measure of strain and the UWES as a measure of engagement. The aim of our study is to test the model using alternative measures. Strain was measured using the NOSI subscale, and engagement using the POSI subscale of the PNOSI, a new tool measuring positive and negative wellbeing. Structural and external validity of this tool have been demonstrated previously (Barbier, Peters & Hansez, submitted). According to the JDR model, we hypothesise that high job demands would lead to strain and then to health problems. Our second hypothesis is that job resources would lead to engagement and then to low intent to leave. Structural equation modelling was performed using Lisrel 8.80 on 954 data collected in a Belgian public institution. As regards to measurement model, results show that a six-factor model (demands, resources, strain, engagement, health problems and intent to quit or IQ) shows good fit to data. We first tested the traditional JDR model, but it showed bad fit. Fit was improved when adding a path from resources to strain, from strain to IQ and from engagement to health problems. This alternative model showed better fit than the initial one. This study makes three main contributions. First, it tests the well-established JDR model using alternative measures of positive and negative sides of well-being. Second, it asks questions as to the respective outcomes of strain and engagement. More specifically, the path between engagement and IQ became not significant when a path from strain to IQ was added. That is, IQ seems to be more a product of strain than of (lack of) engagement. Finally, it emphasizes the important role of resources. It may be that the link between resources and low IQ would be mediated by low level of strain rather than by high level of engagement. Similarly, the relation between engagement and health problem is positive, which raises questions as to the pre-supposed positive effects of engagement. [less ▲]

Detailed reference viewed: 230 (5 ULg)
See detailThe ultraviolet nitric oxide emission in the nightside atmospheres of Venus and Mars
Cox, Cédric ULg; Gérard, Jean-Claude ULg; Bertaux, J. L.

Conference (2009, May)

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See detailComparaison empirique des méthodes classiques de détection du fonctionnement différentiel d’items en psychométrie
Magis, David ULg; De Boeck, Paul; Raîche, Gilles

Conference (2009, May)

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See detailLa compensation des pertes
Richelle, Isabelle ULg

Conference (2009, May)

Detailed reference viewed: 7 (1 ULg)
See detailSense, Nonsense and Context
Gauvry, Charlotte ULg

Conference (2009, May)

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See detailMilitary cultures and education: harmonizing or standardizing Europe?
Paile, Sylvain ULg

Conference (2009, May)

Detailed reference viewed: 18 (0 ULg)
See detailIntentionality and Meaning in Heidegger and Wittgenstein
Gauvry, Charlotte ULg

Conference (2009, May)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailHow to deal with radical changes in downsizing strategies of global companies? Territorial renewal and adaptative institutionalization
Naedenoen, Frédéric ULg; Pichault, François ULg; Xhauflair, Virginie ULg

Conference (2009, May)

A large part of the empirical literature devoted to the question of territorial governance and downsizing still refers to a planning view on corporate strategies (Mintzberg, 1994). A particular ... [more ▼]

A large part of the empirical literature devoted to the question of territorial governance and downsizing still refers to a planning view on corporate strategies (Mintzberg, 1994). A particular restructuring strategy, once being designed and announced, should be implemented as such, in a sequential way. Most studies do not consider the probability, quite high in a context of global uncertainty, of radical reorientations of the downsizing strategy. This is exactly what occurred in the Liege area, where a big steel group decided successively - and according to how the way the economic climate goes - (1) to stop an important part of its activity, (2) to reopen it and lastly (3) to suspend it again. In those conditions - 3 radical changes in less than 5 years - one can easily understand that a linear view on territorial reconversion must be questioned. [less ▲]

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See detailSciences Institutions Responding to Reflexive Modernization
Delvenne, Pierre ULg

Conference (2009, April 30)

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See detailLes sutures en dentisterie : cours théorique et travaux pratiques
LAMBERT, France ULg

Conference (2009, April 30)

Detailed reference viewed: 15 (3 ULg)
See detailApproche pratique face à l'hypertension non contrôlée
Krzesinski, Jean-Marie ULg

Conference (2009, April 28)

Detailed reference viewed: 8 (2 ULg)
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See detailAnalyse des incidents médicamenteux au CHU de Liège
Bottari, Ludovic; Maesen, Didier ULg; Van Hees, Thierry ULg

Conference (2009, April 28)

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See detailImmunoCAP© ISAC: interest in allergy diagnosis
Gadisseur, Romy ULg; Chapelle, Jean-Paul ULg; Cavalier, Etienne ULg

Conference (2009, April 28)

Detailed reference viewed: 16 (0 ULg)
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See detailA new mechanism of upwelling generated filaments based on potential vorticity balance
Troupin, Charles ULg; Mason, Evan; Beckers, Jean-Marie ULg et al

Conference (2009, April 27)

Detailed reference viewed: 8 (0 ULg)
See detailLa construction d'une identité jésuite : le corps et la mémoire
Delfosse, Annick ULg

Conference (2009, April 24)

Detailed reference viewed: 18 (4 ULg)
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See detailDiscours critiques face au modèle dominant dans les sciences de la gestion
Robert, Jocelyne ULg

Conference (2009, April 23)

Detailed reference viewed: 35 (21 ULg)
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See detailThe 1958-2008 Greenland ice sheet surface melt and the mid-tropospheric atmospheric circulation
Fettweis, Xavier ULg

Conference (2009, April 23)

With the aim to study the impact of the mid-tropospheric circulation on the Greenland ice sheet (GrIS) surface melt simulated by the regional climate model MAR, we developed an automatic Circulation Type ... [more ▼]

With the aim to study the impact of the mid-tropospheric circulation on the Greenland ice sheet (GrIS) surface melt simulated by the regional climate model MAR, we developed an automatic Circulation Type Classification (CTC) based on the 500hPa geopotential height from reanalyses over the period 1958-2008. This CTC shows that the dominant mode of the regional atmospheric summer variability around the GrIS is linked to the North Atlantic Oscillation (NAO) and that the surface melt anomalies are highly correlated to the general circulation. It explains notably why a record surface melt was observed during the summers 2007 and 2008. In addition, the climate conditions occurring the 27th August of 2003, where the GrIS temperature was 10°C higher than the normal, were the consequence of an almost unique 500 hPa circulation in the 50 last years. [less ▲]

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See detailGround water flow simulation in mining works: Application of the Hybrid Finite Element Mixing Cell method
Wildemeersch, Samuel ULg; Orban, Philippe ULg; Brouyère, Serge ULg et al

Conference (2009, April 22)

Hydrogeological models can greatly help simulating groundwater flow in the particular context of mining works. However, classical modeling techniques are not so suited in this context because the medium ... [more ▼]

Hydrogeological models can greatly help simulating groundwater flow in the particular context of mining works. However, classical modeling techniques are not so suited in this context because the medium is strongly disturbed by shafts and networks of galleries. Consequently, specific modeling techniques have been developed. Box model techniques require only few parameters but they calculate only mean water levels in exploited zones and do not consider interactions between exploited and unexploited zones. Conversely, physically-based and spatially-distributed techniques represent explicitly both exploited and unexploited zones and take into account interactions between them but they require a lot of parameters sometimes difficult to estimate. The Hybrid Finite Element Mixing Cell (HFEMC) method is a new modeling technique constituting a compromise between simple and complex techniques used in mining context. The principle of this method is to fully couple a representation of exploited zones by a group of mixing cells possibly interconnected by pipes and a representation of unexploited zones by classical finite elements. Interactions between mixing cells and finite elements of the mesh are taken into account through 3rd type (Fourier) internal boundary conditions. With this method, exploited zones are characterized by mean water levels while spatially-distributed hydraulic heads are calculated for the entire adjacent and overlaying unexploited zones. Additionally, thanks to the coupling between mixing cells and finite elements, water exchanges between exploited and unexploited zones are explicitly taken into account. The HFEMC method allows also simulating groundwater rebound following mine closure and associated phenomena such as water inrushes. Concepts and equations of the HFEMC method are presented and illustrated using test cases. First results of an application on an abandoned coalfield in the region of Liege (Belgium) are also proposed. [less ▲]

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See detailPrion: Biosafety Level 3-unconventional transmissible agent
Zorzi, Willy ULg; Elmoualij, Benaïssa ULg

Conference (2009, April 22)

Detailed reference viewed: 18 (1 ULg)
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See detailThe location and topology of electron beams in Io‘s wake
Jacobsen, Sven; Saur, Joachim; Neubauer, Friz et al

Conference (2009, April 22)

The Galileo spacecraft measured hot field aligned electron beams near Io during three flybys. We apply our 3D MHD model of the Io-Jupiter interaction to constrain the location and shape of field aligned ... [more ▼]

The Galileo spacecraft measured hot field aligned electron beams near Io during three flybys. We apply our 3D MHD model of the Io-Jupiter interaction to constrain the location and shape of field aligned electron beams for the individual flyby scenarios. Io continuously generates MHD waves by disturbing the Jovian magnetoplasma. Currents carried by Alfvén waves propagate predominantly along the magnetic field lines. The waves accelerate electrons as the number of charge carriers decreases on their way to Jupiter. These energetic electrons precipitate into the Jovian ionosphere, visible as prominent Io footprint emission in the Jovian aurora. On the other hand electrons have to be accelerated upward to form the beams measured by Galileo. Unlike the beam formation, the position and spatial structure of these beams has been poorly discussed. We adopt our 3D MHD model initial conditions to the individual flyby scenario and determine the spatial morphol- ogy of beams in Io’s orbital plane. We compare our findings to Galileo observations and find very good agreement. Moreover, we use our model to further investigate in detail a recent concept which involves cross-hemisphere electron beams to explain certain auroral features of the Io footprint emission such as a leading spot and secondary spots [Bonfond et al., 2008]. Our results indicate that besides geometrical properties, such as Io’s position in the torus, the incoming plasma density controls the travel path and topology of an electron beam. [less ▲]

Detailed reference viewed: 16 (1 ULg)