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See detailLe(s) génocide(s) vu(s) par des jeunes : représentations et localisations
Grandjean, Geoffrey ULg

Conference (2010, May 10)

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See detailLe(s) génocide(s) vu(s) par des jeunes : représentations et localisations
Grandjean, Geoffrey ULg

in Breux, Sandra; Reuchamps, Min; Loiseau, Hugo (Eds.) Carte mentale et science politique : Regards et perspectives critiques sur un l’emploi d’un outil prometteur (2011)

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See detailLead angles and emitting electron energies of Io-controlled decameter radio arcs
Hess, S. L. G.; Petin, A.; Zarka, P. et al

in Planetary and Space Science (2010), 58(10), 1188-1198

The Io-controlled radio arcs are emissions in the decametric radio range which appear arc shaped in the time-frequency plane. Their occurrence is controlled by Io's position, so it has been for long ... [more ▼]

The Io-controlled radio arcs are emissions in the decametric radio range which appear arc shaped in the time-frequency plane. Their occurrence is controlled by Io's position, so it has been for long inferred that they are powered by the Io-Jupiter electrodynamic interaction. Their frequency ranges correspond to the electron cyclotron frequencies along the Io Flux tube, so they are expected to be generated by cyclotron maser instability (CMI). The arc shape was proposed to be a consequence of the strong anisotropy of the decametric radio emissions beaming, combined with the topology of the magnetic field in the source and the observation geometry. Recent papers succeeded at reproducing the morphologies of a few typical radio arcs by modeling in three dimensions the observation geometry, using the best available magnetic field model and a beaming angle variation consistent with a loss-cone driven CMI. In the continuation of these studies, we present here the systematic modeling of a larger number of observations of the radio arcs emitted in Jupiter's southern hemisphere (including multiple arcs or arcs exhibiting abrupt changes of shape), which permits to obtain a statistical determination of the emitting field line localization (lead angle) relative to the instantaneous Io field line, and of the emitting particle velocities or energies. Variations of these parameters relative to Io's longitude are also measured and compared to the location of the UV footprints of the Io-Jupiter interaction. It is shown that the data are better organized in a reference frame attached to the UV spot resulting from the main Alfven wing resulting from the Io-Jupiter interaction. It is proposed that the radio arcs are related to the first reflected Alfven wing rather than to the main one. (C) 2010 Elsevier Ltd. All rights reserved. [less ▲]

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See detailLead isotopic analysis for the identification of Late Bronze Age pottery from Hala Sultan Tekke (Cyprus)
Renson, Virginie; Coenaerts, J.; Nys, K. et al

in Archaeometry (2011), 53(1), 37-57

Lead isotopic compositions were measured for 65 sherds from five pottery wares (Plain White, Coarse, Canaanite, White Slip and Base-ring) excavated from the Late Bronze Age site of Hala Sultan Tekke ... [more ▼]

Lead isotopic compositions were measured for 65 sherds from five pottery wares (Plain White, Coarse, Canaanite, White Slip and Base-ring) excavated from the Late Bronze Age site of Hala Sultan Tekke (Cyprus). The elemental composition and isotopic signature of the sherds were compared with those of 65 clay samples collected in south-east Cyprus, mainly in the surroundings (<20 km) of Hala Sultan Tekke. This work shows the effectiveness of using lead isotopic analysis in provenance studies, along with other analytical techniques, such as X-ray diffraction (XRD) and a scanning electron microscope (SEM) equipped with an energy dispersive X-ray detection (EDX) facility, to identify the composition of pottery wares and the clay sources used for pottery ware production. [less ▲]

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See detailA leader-follower game in competitive facility location
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

in Computers & Operations Research (2012), 39(2), 437-448

We address the problem of locating new facilities of a firm or franchise that enters a market where a competitor operates existing facilities. The goal of the new entrant firm is to decide the location ... [more ▼]

We address the problem of locating new facilities of a firm or franchise that enters a market where a competitor operates existing facilities. The goal of the new entrant firm is to decide the location and attractiveness of its new facilities that maximize its profit. The competitor can react by opening new facilities, closing existing ones, and adjusting the attractiveness levels of its existing facilities, with the aim of maximizing its own profit. The demand is assumed to be aggregated at certain points in the plane and the new facilities of both the firm and the competitor can be located at predetermined candidate sites. We employ the gravity-based rule in modeling the behavior of the customers where the probability that a customer visits a certain facility is proportional to the facility attractiveness and inversely proportional to the distance between the facility site and demand point. We formulate a bilevel mixed-integer nonlinear programming model where the firm entering the market is the leader and the competitor is the follower. We propose heuristics that combine tabu search with exact solution methods. [less ▲]

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See detailLes leaders immigrés et la construction identitaire
Martiniello, Marco ULg

Scientific conference (1992, December 04)

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See detailLeadership et genre
Cornet, Annie ULg; Bonnivert, S.

in Cornet, Annie; Laufer, Jacqueline; Belghiti, Sophia (Eds.) Genre et GRH, Les défis de l'égalité hommes-femmes (2008)

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See detailLeadership et genre : le piège des compétences sexuées
Cornet, Annie ULg

Conference (2010)

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See detailLeadership et genre : regard croisé de la gestion et de la psychanalyse
Cornet, Annie ULg; CADALEN, Sophie

in Sala, F.; Gueret-Talon, L. (Eds.) Etre homme ou femme dans les organisations: Contribution à l’éclosion de l’économie de la connaissance (2010)

analyse de la littérature sur le leadership féminin et/ou sexué

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See detailLeadership et genre : regard croisé de la gestion et de la psychanalyse
Cornet, Annie ULg; Cadalen, Sophie

in Gazette Cournot (La) (2010), 47

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See detailLeadership et genre : une réalité multiculturelle ?
Cornet, Annie ULg; Bonnivert, S.

Conference (2008, November)

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See detailLeadership et genre : regard croisé de la gestion et de la psychanalyse
Cornet, Annie ULg; Cadalen, Sophie

Scientific conference (2009, May)

La féminisation croissante des différents niveaux du management et l’augmentation du nombre de femmes occupant d e s p o s t e s à responsabilité ont s u s c i t é différentes recherches comparatives sur ... [more ▼]

La féminisation croissante des différents niveaux du management et l’augmentation du nombre de femmes occupant d e s p o s t e s à responsabilité ont s u s c i t é différentes recherches comparatives sur les styles de leadership mobilisés par les hommes et les femmes. Malgré les nombreuses études réalisées sur le sujet, on est très loin du consensus d’une part, sur l’existence ou non de différences dans le leadership féminin et masculin et d’autre part, sur les explications formulées pour avancer ces résultats. [less ▲]

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See detailLeadership et genre : un regard croisé avec la psychanalyse
Cornet, Annie ULg; Cadalen, Sophie

Article for general public (2009)

La féminisation croissante des différents niveaux du management et l’augmentation du nombre de femmes occupant d e s p o s t e s à responsabilité ont s u s c i t é différentes recherches comparatives sur ... [more ▼]

La féminisation croissante des différents niveaux du management et l’augmentation du nombre de femmes occupant d e s p o s t e s à responsabilité ont s u s c i t é différentes recherches comparatives sur les styles de leadership mobilisés par les hommes et les femmes. Malgré les nombreuses études réalisées sur le sujet, on est très loin du consensus d’une part, sur l’existence ou non de différences dans le leadership féminin et masculin et d’autre part, sur les explications formulées pour avancer ces résultats. [less ▲]

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See detailLeadership et modèles de gestion des ressources humaines
Pichault, François ULg

in Cobbut, Eric (Ed.) Vers un leadership de qualité. Rêve ou réalité ? (2007)

Studies the contextual conditions under which a quality-based leadership may be efficient

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See detailLeadership et pouvoir dans les communautés d’origine immigrée
Martiniello, Marco ULg

Scientific conference (1993, February 08)

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See detailLe leadership ethnique en Belgique
Martiniello, Marco ULg

Scientific conference (1992, April 22)

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See detailLeaf carbohydrate controls over Arabidopsis growth and response to elevated CO2: an experimentally based model
Rasse, Daniel; Tocquin, Pierre ULg

in New Phytologist (2006), 172(3), 500-513

Transient starch production is thought to strongly control plant growth and response to elevated CO2. We tested this hypothesis with an experimentally based mechanistic model in Arabidopsis thaliana ... [more ▼]

Transient starch production is thought to strongly control plant growth and response to elevated CO2. We tested this hypothesis with an experimentally based mechanistic model in Arabidopsis thaliana. Experiments were conducted on wild-type (WT) A. thaliana, starch-excess (sex1) and starchless (pgm) mutants under ambient and elevated CO2 conditions to determine parameters and validate the model. The model correctly predicted that mutant growth is approx. 20% of that in WT, and the absolute response of both mutants to elevated CO2 is an order of magnitude lower than in WT. For sex1, direct starch unavailability explained the growth responses. For pgm, we demonstrated experimentally that maintenance respiration is proportional to leaf soluble sugar concentration, which gave the necessary feedback mechanism on modelled growth. Our study suggests that the effects of sugar-starch cycling on growth can be explained by simple allocation processes, and the maximum rate of leaf growth (sink capacity) exerts a strong control over the response to elevated CO2 of herbaceous plants such as A. thaliana. [less ▲]

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See detailLeaf carbohydrate status in Lolium temulentum during the induction of flowering
Périlleux, Claire ULg; Bernier, Georges ULg

in New Phytologist (1997), 135(1), 59-66

Unifoliated plants of Lolium temulentum L. ev. Ceres, a qualitative long-day grass, were induced to flower by one 24-h long day (LD) or by one 8-h short day (SD) advanced by 1 2 h in the normal regime, so ... [more ▼]

Unifoliated plants of Lolium temulentum L. ev. Ceres, a qualitative long-day grass, were induced to flower by one 24-h long day (LD) or by one 8-h short day (SD) advanced by 1 2 h in the normal regime, so-called 'displaced short day' (DSD). Standard light for SD and DSD was a mixture of fluorescence and incandescence at 400 µmol m2 s-1 whereas the extension period of the 24-h LD was solely incandescence at 10-15 µmol m2 s-1. The DSD system was first characterized by the timings of floral induction, stimulus translocation and apical development. Carbohydrates in the blade tissues and in leaf exudate were analysed comparatively in vegetative and induced plants. Fructans were not detected in the leaf tissues whereas sucrose and starch were found to be present in similar amounts. In SD, their contents exhibited a diurnal fluctuation and were not in large excess. The common change observed during the two inductive treatments was that starch remained at a high level during the LD extension, even though the lighting was unsuitable for photosynthesis, and increased transiently in DSD. Sucrose was the major sugar contained in the leaf exudate. Its content increased when flowering was induced, but not at the same time in the two systems. In LD, sucrose exudation rose when plants were returned to standard light after the inductive cycle, i.e. after the LD stimulus had left the leaf blade. By contrast, during the DSD, sucrose was transported at the same time as the floral stimulus. Results are discussed together with the methods used to time stimulus translocation and their implications. [less ▲]

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See detailLeaf fall impact on diversity and trophic ecology of vagile macrofauna associated with exported P.oceanica litter
Remy, François ULg; Mascart, Thibaud ULg; Dauby, Patrick ULg et al

Poster (2012, August 20)

In the Mediterranean Sea, Posidonia oceanica meadows produce a huge amount of detritus, evaluated up to 300 to 2000 g dry wt m-2 yr-1. This litter is mainly composed of dead leaves but also of uprooted P ... [more ▼]

In the Mediterranean Sea, Posidonia oceanica meadows produce a huge amount of detritus, evaluated up to 300 to 2000 g dry wt m-2 yr-1. This litter is mainly composed of dead leaves but also of uprooted P.oceanica shoots and drift macro-algae from adjacent rocky bottoms. Although rich in refractory materials (lignin) and poor in P and N, these underwater accumulations of leaves are colonised by fungi, micro-algae (like diatoms), bacteria, but also by micro and macrofauna assemblages. These organisms could play an important role in leaf litter degradation and enrichment, but also in energy and carbon transfer from P.oceanica to higher trophic levels in adjacent coastal ecosystems. In this study we focus on the vagile macro-fauna (invertebrates with a size > 500µm) inhabiting the exported litter accumulations of the Calvi Bay (France). We took standardised samples at two different sites (a sheltered one and an exposed one) before and after leaf fall. We emphasised that crustaceans represent 65 – 85% of the biodiversity, followed by annelids and molluscs, representing respectively 10-20% and 10-15% of the diversity. That general pattern differs between sampling sites and we highlighted changes after leaf fall at both sites. In order to assess the impact of the autumn period litter input on the trophic structure of these invertebrates, we conducted gut contents observations and “bulk” stable isotope analysis. The isotopic compositions of C and N stable isotopes of the potential detritic food sources and of the most abundant invertebrate’s species were measured using EA-IRMS. We finally focused on the two most abundant Gammaridean Amphipoda species representing up to about 60% of the vagile macrofauna found in litter accumulations: Gammarella fucicola and Gammarus aequicauda. The results of their isotopic measurements were used in the “SIAR” Bayesian mixing model to calculate the potential contribution of their potential food sources. [less ▲]

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