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See detail"Emboîtements cinématographiques : du prétexte narratif au discours imagé"
Belloi, Livio ULg

Conference (2011, August 25)

Si un récit romanesque peut accueillir en abyme une réplique en miniature (Lucien Dällenbach), si, dans le même esprit, un tableau de peinture peut ouvrir son espace à un autre tableau de peinture (Victor ... [more ▼]

Si un récit romanesque peut accueillir en abyme une réplique en miniature (Lucien Dällenbach), si, dans le même esprit, un tableau de peinture peut ouvrir son espace à un autre tableau de peinture (Victor Stoichita), l’image de cinéma n’est pas en reste à cet égard : très tôt, elle s’est mise au miroir, par le procédé devenu canonique du film dans le film. En pareil cas d’espèce, le film premier convoque un film second, identifiable ou non, qui en constitue la glose ou la mise en ironie, selon des structures de redoublement variables. J'aborde ce phénomène de métadiscursivité au travers de deux sites d’images spécifiques : d’une part, le cinéma des premiers temps ; de l’autre, le cinéma expérimental contemporain. Dans le champ du cinéma des premiers temps, il s’agit d’examiner des occurrences assez précoces de réflexivité, au sein desquelles l’image seconde tient essentiellement lieu d’embrayeur narratif. Ainsi, dans "Erreur tragique" (1912) de Louis Feuillade, le personnage principal, assistant à une projection dans une salle de cinéma, a la surprise de voir apparaître sa propre épouse à l’écran, au bras d’un autre homme – prélude à un intense mélodrame conjugal. S’agissant du cinéma expérimental contemporain, l’image seconde se prête généralement à un enchâssement plus complexe au sein du film qui l’inclut et obéit plutôt à une exigence d’interrogation critique du cinéma par lui-même. Ce cas de figure sera envisagé au travers de "Tails" (1976) de Paul Sharits, œuvre méconnue dans laquelle le cinéaste, prolongeant le geste pionnier de Ken Jacobs ("Tom, Tom, the Piper’s Son", 1969), refilme des fragments de pellicule en mouvement et libère l’image seconde des contraintes imposées par le dispositif de projection, la mettant en situation de discourir muettement sur les propriétés physiques du film qui l’expose. [less ▲]

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See detailThe Tell-Tale Heart of Political Science: Literal vs. Metaphorical Use of Narrative in Analysing Power Relations
Claisse, Frédéric ULg; Delvenne, Pierre ULg

Conference (2011, August 25)

Judging by their current uses in policy analysis, the merits of notions such as ‘policy narrative’ and ‘meta-narrative’ seem to reside more in their evocative or suggestive character than in any capacity ... [more ▼]

Judging by their current uses in policy analysis, the merits of notions such as ‘policy narrative’ and ‘meta-narrative’ seem to reside more in their evocative or suggestive character than in any capacity to “tell a story”. Narratives constructed by political scientists mostly have a representational content that bears little similarity with what narratology as a discipline studies. Breaking up with this metaphorical use, we propose to take the storytelling dimension of policy narrative more seriously, ie. more literally. Though narratives proved useful in understanding the articulation of discursive patterns and power struggles in policy processes, we think it paradoxically failed to provide a consistent analysis of what is at stake when agents and institutions get “entangled in stories” (to take the expression of German phenomenologist Wilhelm Schapp). What would happen to policy narratives if, according to the strictly technical, narratological sense of the word, we suddenly turned actors and agents into “characters”, who get transformed through a series of trials and tests? Similarly, if we restored the notion of perspective (what narratologists call ‘focalization’), what would be the consequence for the policy analyst to be envisaged as a narrator? [less ▲]

Detailed reference viewed: 173 (7 ULg)
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See detailSmall islands in popular culture. An imagery of vulnerability
Gemenne, François ULg

Conference (2011, August 25)

Detailed reference viewed: 16 (0 ULg)
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See detailWalt Disney chorégraphe. Vers une redéfinition de l’art du mouvement dessiné
Tomasovic, Dick ULg

Conference (2011, August 19)

Detailed reference viewed: 38 (9 ULg)
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See detailClimate-carbon cycle feedback during glacial cycles
Ganopolski, A; Brovkin, V; Calov, R et al

Conference (2011, August 15)

Paleoclimate records reveal a close link between global ice volume and atmospheric CO2 concentration, at least, through the last 800,000 years. Despite many efforts over the last two decades, mechanisms ... [more ▼]

Paleoclimate records reveal a close link between global ice volume and atmospheric CO2 concentration, at least, through the last 800,000 years. Despite many efforts over the last two decades, mechanisms of glacial-interglacial CO2 variability and its role for the glacial cycles remain elusive. Here using the Earth system model of intermediate complexity CLIMBER-2 which includes all major components of the Earth system – atmosphere, ocean, land surface, ice sheets, terrestrial biota, eolian dust and marine biogeochemistry – we performed simulations of the last glacial cycles employing variations in the Earth’s orbital parameters as the only prescribed climatic forcing. In the experiments with constant CO2 concentration, temporal dynamics of the simulated glacial cycles strongly depend on the CO2 level. For CO2 concentrations about and above preindustrial one, the model simulates only short glacial cycles with precessional and obliquity frequencies. However, for lower CO2 concentrations the model simulates long glacial cycles with dominant 100 kyr periodicity. Simulated glacial cycles agreed favorably with paleoclimate reconstructions, but their amplitude is underestimated compared to those of the simulations with time-dependent CO2 concentration. These results confirm that the positive climate-carbon cycle feedback plays an important role in amplification of long glacial cycles. Experiments with fully interactive CO2 shed some light on the mechanism of climate-carbon cycle feedback during glacial cycles. Forced by orbital variations only, the model is able to reproduce the main features of CO2 changes: the 40 ppmv CO2 drop during glacial inception, the minimum concentration at the last glacial maximum being 80 ppmv lower than the Holocene value, and the relatively abrupt CO2 rise during the deglaciation. The main drivers of atmospheric CO2 evolve with time: changes in sea surface temperature and volume of bottom water of southern origin exert CO2 control during glacial inception and deglaciation, while changes in carbonate chemistry and marine biology are dominant during the first and second parts of the glacial cycles, respectively. [less ▲]

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See detailLa surveillance des maladies de la faune sauvage en Belgique.
Linden, Annick ULg; Moinet, M; Wirtgen, M et al

Conference (2011, August 14)

Detailed reference viewed: 2 (1 ULg)
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See detailThe Hidden Recess of a Global City: La République Marseille
Van Cauwenberge, Geneviève ULg

Conference (2011, August 13)

Detailed reference viewed: 16 (3 ULg)
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See detailPneumonia with Aeromonas sobria in a Carpet Python
Gandar, Frederic ULg; Szalo, Ioan Mihai ULg; Marlier, Didier ULg

Conference (2011, August 11)

Aeromonas sobria was isolated and identified upon post-mortem examination from the respiratory tract and the blood of a carpet python (Morelia spilota variegata). The snake was referred to the Faculty of ... [more ▼]

Aeromonas sobria was isolated and identified upon post-mortem examination from the respiratory tract and the blood of a carpet python (Morelia spilota variegata). The snake was referred to the Faculty of Veterinary Medicine of Liège for necropsy, just the day after it suddenly died without previous clinical sign. Lung and liver biopsies were performed and fixed in neutral buffered 10% formalin and paraffin embedded. Blood samples were collected via cardiocentesis, and air sac abscesses were cultured. Bacterial strains were identified as Aeromonas sobria by 16S rDNA sequencing. Based on histological and bacterial examinations, the death of this snake was attributed to a septicemia, following an acute primary, or secondary exudative pneumonia. Aeromonas sp. is established as a potential pathogen in reptiles. Among this genus, Aeromonas hydrophila is the most frequently isolated. A. sobria has been reported as a primary pathogen in farmed perch (Perca fluviatilis) and humans. Conversely, few data are available concerning the pathogenicity of A. sobria in reptiles. Other non-bacterial agents (virus, fungus, endoparasites) or predisposing factors (such as obesity) can also be responsible for respiratory tract disease in snakes . Unfortunately, in the current case, virological investigations were not performed. [less ▲]

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See detailValue and the self in the medial prefrontal cortex
D'Argembeau, Arnaud ULg

Conference (2011, August 04)

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Peer Reviewed
See detailFuture thinking and the self
D'Argembeau, Arnaud ULg

Conference (2011, August 04)

Detailed reference viewed: 43 (4 ULg)
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See detailCase study of contamination by Listeria monocytogenes in raw goat milk cheese: development of a quantitative risk assessment model of the production chain
Korsak Koulagenko, Nicolas ULg; Delhalle, Laurent ULg; Daube, Georges ULg

Conference (2011, August 03)

Introduction: Quantitative Risk assessment could be applied in industries as a tool to control and manage the safety of food products. Purpose: A contamination by Listeria monocytogenes of cheeses made ... [more ▼]

Introduction: Quantitative Risk assessment could be applied in industries as a tool to control and manage the safety of food products. Purpose: A contamination by Listeria monocytogenes of cheeses made from raw milk was reported by the Belgian food agency. This contamination was caused by the presence of an asymptomatic “shedder” goat in the herd. With field and laboratory collected data, a quantitative risk assessment model of the production chain was developed. Methods: A modular risk model was built to simulate the food production pathway covering the milking of goats until the final product for the customers. A dynamic square root model was used to predict the growth rate in relation with the temperature, the pH and the water activity along the production chain with predictive microbiology modules. Results: The shedder goat was identified from the herd and milk samples were taken from the two different parts of the mammary gland with 2.6 log cfu (colonies forming units) Listeria monocytogenes/ml for the right part and absence in 25 ml for the left part of the mammary gland. Numbering of Listeria monocytogenes was carried out on the final products with 3.6 log cfu/g in the fresh not ripened cheeses. The modular risk assessment shows a significant growth of Listeria monocytogenes during chilling and storage of the milk collected the day before the cheese production (increase of 0.6 log cfu/ml) and during adjunction of ferment and rennet to milk (increase of 0.8 log cfu/ml). The model confirms the results obtained in the final products. Significance: The modular risk model gives valuable informations to identify and to control critical steps in the food production chain of goat cheese made from raw milk. Only one shedder goat can cause a high risk to become ill for the consumers of contaminated products. [less ▲]

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See detailFood provisioning and agonistic behaviours in commensal long-tailed macaque (Macaca fascicularis) at Uluwatu Temple, Bali (Indonesia)
Brotcorne, Fany ULg; Huynen, Marie-Claude ULg; Wandia, I. Nengah

Conference (2011, August)

Most previous research on nonhuman primates reported increased levels of agonistic behaviors associated with food provisioning by humans. To further investigate the permanence of this effect of increased ... [more ▼]

Most previous research on nonhuman primates reported increased levels of agonistic behaviors associated with food provisioning by humans. To further investigate the permanence of this effect of increased social competition in long-term commensal-living primates, we examined the immediate impact of food provisioning on agonistic behavior rates in a commensal population of long-tailed macaques (Macaca fascicularis) at Uluwatu Temple, Bali (Indonesia). We compared proportions of agonistic behaviors between various food provisioning levels defined by the absence/presence and the quantity of food provisioned. We collected data using focal and scan sampling methods during a four-month study period (June to October 2010). We performed non-parametric statistical tests (Wilcoxon Test & Friedman Test; p < .05) on a population sample of 66 individuals. Results did not show obvious impact of provisioning on agonism rates, nor increase of potential appeasement strategies such as sexual behaviours, grooming or self-directed behaviours, often associated with the presence of provisioned food. These data suggest that the long-tailed macaques at Uluwatu Temple are responding effectively to high provisioning level, that is, without increasing social competition. We hypothesize that the high spatiotemporal abundance of human food, associated with the species’ eco-behavioural flexibility and the long term story of human-macaque commensal relationships in Uluwatu may explain the absence of provisioning impact on agonistic rates. [less ▲]

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See detailUV-IR comparison: Jupiter aurora
Gérard, Jean-Claude ULg; Grodent, Denis ULg

Conference (2011, August)

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See detailVortex deformation and stepper motors
Silhanek, Alejandro ULg

Conference (2011, August)

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See detailLa chimie verte. Principes généraux et illustration pour la valorisation des agroressources
Richel, Aurore ULg

Conference (2011, August)

Le concept de « chimie verte » se décrit comme un ensemble cohérent de 12 principes ayant pour objectif de réduire ou d’éliminer l’utilisation et la génération de substances dangereuses émanant de la ... [more ▼]

Le concept de « chimie verte » se décrit comme un ensemble cohérent de 12 principes ayant pour objectif de réduire ou d’éliminer l’utilisation et la génération de substances dangereuses émanant de la synthèse et de l’application des produits chimiques. Parmi ces 12 principes, la réduction des déchets à la source, la diminution de l’utilisation des réactifs toxiques, la conservation de l’énergie et l’exploitation de matières premières renouvelables sont présentés et discutés sur base de quelques exemples choisis. [less ▲]

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See detailMechanochemistry of a single polypeptide molecule: Study of force-induced conformational transitions
Willet, Nicolas ULg; Hinterdorfer, Peter; Lecommandoux, Sébastien et al

Conference (2011, August)

The aim of this study is to investigate the mechanochemical behavior of homopolypeptides able to change their conformation is a stimuli-responsive way. The peptidic secondary structures were studied in ... [more ▼]

The aim of this study is to investigate the mechanochemical behavior of homopolypeptides able to change their conformation is a stimuli-responsive way. The peptidic secondary structures were studied in detail by atomic force microscopy (AFM) at the single-molecule level. Synthetic copolymers containing a polypeptide block were prepared by N-carboxyanhydride amino acid ring-opening polymerization. The polymer chains were grafted as a dilute brush onto gold surfaces via disulfide end-groups. Their mechanochemical behavior was then studied by AFM single-molecule force spectroscopy (SMFS). The investigated polypeptide blocks were based on poly(L-glutamic acid), which undergoes a transition from alpha-helix to random coil. This can be induced by external stimuli (pH, ionic strength, temperature) or simply by applying a force. We were able to study the mechanically driven unfolding of the peptide by stretching-release cycles of the biomacromolecule. Stretching the helical peptide resulted in original features in the force-distance traces. Plateaus that are specific for the helical conformation were detected, quantified and discussed. Pulling-relaxing SMFS experiments eventually led to a better understanding of the force induced unfolding of a alpha-helix and the reversibility of the phenomenon. [less ▲]

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See detailHow to improve the ship efficiency
Caprace, Jean-David ULg

Conference (2011, August)

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See detailMicroorganisms from aphid honeydew attract natural enemies and tending ants
Verheggen, François ULg; Leroy, Pascal; Fischer, Christophe ULg et al

Conference (2011, August)

Aphids are some of the most serious pests of cultivated crops worldwide, causing major yield and economic losses. Previous works have demonstrated ants and natural enemies (including ladybeetles and ... [more ▼]

Aphids are some of the most serious pests of cultivated crops worldwide, causing major yield and economic losses. Previous works have demonstrated ants and natural enemies (including ladybeetles and hoverflies) to be able to use aphid volatile chemicals to locate aphid colonies. Here, we report the first isolation of a bacterium from the pea aphid Acyrthosiphon pisum honeydew, Staphylococcus sciuri, which produces kairomones used by the aphidophagous hoverfly Episyrphus balteatus and the Asian Ladybeetle Harmonia axyridis during their search for prey colonies. Some specific semiochemicals produced by S. sciuri were identified as attractants and ovipositional stimulants. Similarly, we have shown scouts of the aphid tending ant species, Lasius niger, to orientate their foraging behaviour toward an Aphis fabae infested plant and we have demonstrated that the odours released by this aphid honeydew were attractive for ant scouts. Again, bacteria were involved in the production of these honeydew semiochemicals. Interestingly, ant scouts were also able to discriminate honeydew odour from A. fabae (usually attended by L. niger) and A. pisum (unattendedby L. niger). Comparison of the volatile and bacteria composition of both aphid species honeydew were attended. [less ▲]

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See detailConsequences of selection for milk quality and robustness traits
Bastin, Catherine ULg; Berry, D. P.; Coffey, M. P. et al

Conference (2011, August)

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See detailThe use of liquid biofuels in heating systems: a review
Makaire, Danielle ULg; Sartor, Kevin ULg; Ngendakumana, Philippe ULg

Conference (2011, August)

European Union has set the 2020 strategy to increase the share of renewable energy use to 20% by 2020. Currently, most attention is focussed on the use of alternative fuels from biomass for energy ... [more ▼]

European Union has set the 2020 strategy to increase the share of renewable energy use to 20% by 2020. Currently, most attention is focussed on the use of alternative fuels from biomass for energy purposes. These alternative fuels are called bioliquids. This paper reviews the current experimental works that have been performed on the combustion of vegetable oil, biodiesel and bioethanol in various heating combustion units. This review focuses on the feasibility of bioliquids use in heating systems as well as their “environmental friendly” potential. [less ▲]

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See detailThe federal electoral constituency in Belgium: deliberative perspectives
Dodeigne, Jérémy ULg

Conference (2011, August)

Belgium constitutes a good illustration of Mill’s statement about public opinion in divided societies: “the united public opinion…cannot exist [in a country which citizens] read and speak different ... [more ▼]

Belgium constitutes a good illustration of Mill’s statement about public opinion in divided societies: “the united public opinion…cannot exist [in a country which citizens] read and speak different languages” (1993: 391-7). However, according to Lijphart (2007), sociological and political divisions are not problematic. On the contrary, his seminal work on consociationalism promotes such separations among social groups through power-sharing and self-rule. Concerning its electoral system, Belgium represents a striking case of consociational design; whereas criticised by several due to its consequences on the Belgian political system. Indeed, it implies an ethnicisation of political life while it favours intra-groups’ claims escalation as well as it prevents inter-groups communication. In this respect, the proposal for a federal electoral constituency (FEC) in Belgium was put back on the agenda in 2007. First proposed in 1979, the proposal was quite fairly debated during the electoral campaign and government formation.This proposal offers deliberative perspectives to that question. Indeed, electoral studies do not tackle citizens’ perceptions, at least not directly, nor do they focus on reasons of citizens’ opinions. Yet, a specific deliberative methodology (scenario workshop) can explore this research path. Based on data collected during autumn 2009, we can offer tentative answers to crucial questions relating to citizens’ opinions about the FEC: what do they think? Do they feel involved and concerned by this debate? Do they agree or disagree with the electoral reform proposal? And, more importantly, why do they think so when invited to deliberate with other citizens, politicians and experts? [less ▲]

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See detailResting-state fMRI activity in tinnitus
MAUDOUX, Audrey ULg

Conference (2011, August)

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See detailA note about non stationary multiresolution analysis
Simons, Laurent ULg

Conference (2011, July 28)

An orthonormal basis of wavelets of $L^2(\mathbb{R})$ is an orthonormal basis of $L^2(\mathbb{R})$ of type \[ \psi_{j,k}=2^{j/2}\psi(2^j\cdot-k),\quad j,k\in\mathbb{Z}. \] A classical method to obtain ... [more ▼]

An orthonormal basis of wavelets of $L^2(\mathbb{R})$ is an orthonormal basis of $L^2(\mathbb{R})$ of type \[ \psi_{j,k}=2^{j/2}\psi(2^j\cdot-k),\quad j,k\in\mathbb{Z}. \] A classical method to obtain such bases consists in constructing a multiresolution analysis. When the mother wavelet $\psi$ depends on the scale (i.e. the index $j$), a non stationary version of multiresolution analysis is then used. We generalize different characterizations of orthonormal bases of wavelets to the non stationary case (as main reference for the stationary case, we used results presented in "A First Course of Wavelets" of E. Hernandez and G. Weiss). [less ▲]

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See detailRobustness properties of the TCLUST procedure
Ruwet, Christel ULg; García-Escudero, Luis Angel; Gordaliza, Alfonso et al

Conference (2011, July 27)

The TCLUST procedure is a robust clustering procedure introduced by García-Escudero et al. (2008). It performs clustering with the aim of fitting clusters with different scatters and weights. As the ... [more ▼]

The TCLUST procedure is a robust clustering procedure introduced by García-Escudero et al. (2008). It performs clustering with the aim of fitting clusters with different scatters and weights. As the corresponding objective function can be unbounded, a restriction is added on the eigenvalues-ratio of the scatter matrices. The robustness of the method is guaranteed by allowing the trimming of a given proportion of observations. As García-Escudero and Gordaliza (1999) have done for the k-means and trimmed k-means methodologies, the robustness properties of the TCLUST procedure are studied by means of the influence function and the breakdown point. In order to be able to compare the robustness of TCLUST with other clustering methods, dissolution point and isolation robustness (Hennig, 2008) are also considered. It turns out that the TCLUST procedure has a behavior close to that of the trimmed k-means. [less ▲]

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See detailChemical and physical factors involved in the aggregation behaviour of Harmonia axyridis Pallas
Durieux, Delphine ULg; Fischer, Christophe ULg; Deneubourg, Jean-Louis et al

Conference (2011, July 27)

Detailed reference viewed: 55 (8 ULg)
See detailLe renversement du monde dans le message de Simon Kimbangu
Melice, Anne ULg; Sarró, Ramon

Conference (2011, July 26)

Detailed reference viewed: 37 (2 ULg)
See detailL’image politique de Kimbangu et du kimbanguisme au Congo belge
Melice, Anne ULg

Conference (2011, July 25)

Detailed reference viewed: 35 (0 ULg)
See detailDimension Reduction and Measure Transformation in Stochastic Simulations of Coupled Systems
Arnst, Maarten ULg; Ghanem, Roger; Phipps, Eric et al

Conference (2011, July 25)

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See detailEvidence of complex phylogeographic structure for the threatened rodent Leopoldamys neilli endemic to limestone karsts of Thailand
Latinne, Alice ULg; Waengsothorn, Surachit; Herbreteau, Vincent et al

Conference (2011, July 21)

Limestone karsts are highly threatened biodiversity hotspots supporting huge levels of endemic species. Karsts are patchy distributed within Southeast Asia and their isolation from one another give them ... [more ▼]

Limestone karsts are highly threatened biodiversity hotspots supporting huge levels of endemic species. Karsts are patchy distributed within Southeast Asia and their isolation from one another give them the features of “islands on the continent”. We have studied the phylogeography of Neill’s Rat Leopoldamys neilli, a threatened murine rodent species endemic to limestone karsts of Thailand, in order to assess the influence of its endemicity to karst habitat on its phylogeographic pattern. Two hundred twenty-two individuals of L. neilli were collected in 26 limestone karsts throughout the geographical range of this species and were used in this study. Phylogeographic structure and population genetics of L. neilli were investigated on the basis of two mitochondrial markers, the cytochrome b gene and the cytochrome c oxydase subunit I gene, two nuclear fragments, the β-fibrinogen intron 7 and the intron 1 of the X-linked gene G6pd, and 12 microsatellite loci. Our study gave evidence of a complex and strong geographic structure of the genetic diversity for L. neilli. Several highly differentiated genetic lineages were observed throughout Thailand. These results suggest a severe fragmentation of L. neilli’s populations, correlated to the fragmented distribution of its habitat and highlight its high endemicity to limestone karsts. In conclusion, this study revealed an unexpected high level of intraspecific diversity within L. neilli. These results consolidate the importance to strengthen the protection of limestone habitats and to preserve not only their huge interspecific but also intraspecific diversity. [less ▲]

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See detailDe la torture à la désobéissance civile: quid pour les psychologues?
Mormont, Christian ULg

Conference (2011, July 20)

Theoretically, it is strictly forbidden to psycholgists to commit torture. In reality things are more complicated and the position of APA is not absolutely clear.

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See detailA Bayesian person fit evaluation for polytomous response data
Béland, Sébastien; Hoijtink, Herbert; Raîche, Gilles et al

Conference (2011, July 19)

Studies about Person-fit are generally produced under a frequentist approach. For example, Meijer & Sijtsma (2001) discussed many parametric and non-parametric indexes in their review on this topic ... [more ▼]

Studies about Person-fit are generally produced under a frequentist approach. For example, Meijer & Sijtsma (2001) discussed many parametric and non-parametric indexes in their review on this topic. However, it exists also few papers about the investigation of person-fit in a Bayesian context (e.g. Glas & Meijer, 2003; Van Der Linden & Guo, 2008). In this talk, we present a new method based on the evaluation of informative hypotheses using the Bayes factor. This approach is non-parametric in nature and can be applied to a large variety of situations and many types of data. Here, we focus on the use of Bayesian person-fit methods that can be used with polytomous response data. This presentation is divided in two sections. First, we present the technical aspects of this approach by discussing some hypotheses of interest, the nature of the prior and the nature of the posterior. Second, we present results from a real data matrix. The first analysis shows that Bayesian person-fit evaluation is efficient and can be easily applied to small data matrices. [less ▲]

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See detailOptimization of the PML in the Discrete Context for Wave-Like Problems
Modave, Axel ULg; Delhez, Eric ULg; Geuzaine, Christophe ULg

Conference (2011, July 18)

The Perfectly Matched Layer (PML) is widely used for unbounded problems. However its performances depend critically on both an absorption coefficient and the numerical method. The coefficient is generally ... [more ▼]

The Perfectly Matched Layer (PML) is widely used for unbounded problems. However its performances depend critically on both an absorption coefficient and the numerical method. The coefficient is generally tuned by using optimization procedures. In this talk we will present some efficient profiles of the coefficient that overcome every tuning in discrete contexts. These profiles and others will be compared by using benchmarks with different numerical methods. [less ▲]

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See detailUncertain Handshaking for Coupled Physics
Phipps, Eric; Arnst, Maarten ULg; Red-Horse, John et al

Conference (2011, July 18)

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See detailMonitoring delivery chains in a supply chain using multivariate control charts
Faraz, Alireza ULg; Heuchenne, Cédric ULg; Saniga, Erwin et al

Conference (2011, July 13)

The theory of the delivery chain considers the delivery of goods and services to customers within a specific time interval. Nowadays, organizations are focusing to satisfy their customers’ demands not ... [more ▼]

The theory of the delivery chain considers the delivery of goods and services to customers within a specific time interval. Nowadays, organizations are focusing to satisfy their customers’ demands not only to meet the expectations for products quality but also in delivery times through managing delivery chains. Obviously it is desirable that a company has minimum delivery time of goods and services to its customers. Therefore, establishing economic and reliable control charts for monitoring the key characteristics of delivery chain is of great importance especially for managers to improve the whole delivery chains performance. On the other hand, as we shall see in the present paper, the performance of a delivery chain is multivariate in nature because customers do not evaluate a delivery performance with a univariate mindset and also there are usually several production and delivery sites, and variety of different methods of transportation of goods and services. In this paper, we propose a relatively new application of the economic statistical design of the multivariate T2 control chart to monitor the delivery chain performance and it is illustrated through a case study in the TNT express mail in Iran. [less ▲]

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See detailIs there value in maintaining small populations ? Example of the Dual-Purpose Belgian Blue breed.
Gengler, Nicolas ULg; Soyeurt, Hélène ULg; Bastin, Catherine ULg et al

Conference (2011, July 13)

Current status of thinking on genomic selection in dairy cattle is mostly major breed centric (e.g., Holstein) and only for traditional traits (e.g., milk yields). Once you depart from this, it becomes ... [more ▼]

Current status of thinking on genomic selection in dairy cattle is mostly major breed centric (e.g., Holstein) and only for traditional traits (e.g., milk yields). Once you depart from this, it becomes obvious that different, often related, issues appear (e.g., lack of large training populations, need for expensive recording of new phenotypes). Also, there is an urgent need to rethink issues that are important for sustainability of dairy production (e.g., added value foods, animal robustness). In this context, small populations (breeds/lines) could represent a potential source of extra information to justify their maintenance. As marker densities increase, efficient dissection of different selection histories of divergent breeds or lines, potentially identifying pockets of unexploited variability will increase. A current example from the Belgian (Walloon) perspective is the Dual Purpose (DP) line of the Belgian Blue Breed (BBB), with presently around 4500 breeding females, for historical reason of which only 1500 have good pedigrees, and which is present in Belgium and northern France. Recent research, done on this line, showed its tendency to produce less saturated milk fat and to have better fertility. Results indicated that it could stay competitive in specific markets, especially because of largely increased meat value. Currently, the myostatin mutation is largely used for breeding purposes. To assess the genetic diversity of the breed, recently, over 200 genotypes (SNP50K) for nearly all breeding bulls of the last 20 years became available. HD genotypes should be available in the near future, also allowing to access selection history of this breed as being in between the 2 extreme breeds: Beef BBB (with which it shares a recent history) and Holstein-Friesian (which is related through its geographic proximity over centuries). Finally, genomic selection for DP-BBB will need to consider a single step type approach without the need of reference population and potentially relying heavily on SNP3K of cows, also with the objective to recreate relationships between animals of interest. [less ▲]

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See detailMémoire versus souvenir: photographie, torture et cinéma
Hamers, Jérémy ULg

Conference (2011, July 12)

Detailed reference viewed: 92 (11 ULg)
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See detailNatural and invariant quantizations
Radoux, Fabian ULg

Conference (2011, July 12)

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See detailA recursive method of approximation of the inverse of genomic relationships matrix
Faux, Pierre ULg; Gengler, Nicolas ULg; Misztal, Ignacy

Conference (2011, July 11)

Genomic evaluations by some procedures such as genomic BLUP (GBLUP) or single-step GBLUP (ssGBLUP) use the inverse of the genomic relationship matrix (G). The cost to create such an inverse is cubic and ... [more ▼]

Genomic evaluations by some procedures such as genomic BLUP (GBLUP) or single-step GBLUP (ssGBLUP) use the inverse of the genomic relationship matrix (G). The cost to create such an inverse is cubic and becomes prohibitively expensive after 30–100k genotypes. The purpose of this study was to develop methodologies, which eventually could compute a good approximation of G−1 at reduced cost. A recursive approximation of the inverse is based on a decomposition similar to that for the pedigree-based relationship: G−1 = (T−1)’D−1T−1, where T is a triangular and D a diagonal matrix. In the first step, animals are processed from the oldest to the youngest. For each animal, a subset of ancestors is selected with coefficients of genomic relationship to that animal greater than a threshold. A system of equations is created where the coefficients of G for the selected ancestors are in the left hand side and the coefficients of G for the given animal corresponding to the ancestors are the right hand side. The solution to that system of equation is stored in one line of T. Then, D is computed as diagonal elements of T−1G(T−1)’. If off-diagonals of D are too large, the approximation to G can be improved by repeated applications of G−1 = (T−1)’D−1T−1 and D = T−1G(T−1)’. After n rounds, the approximation of G inverse is a product of 2n triangular matrices and one diagonal matrix. This recursive method has been assessed on a sample of 1,718 genotyped dairy bulls. The correlation between GEBV using the complete or approximated G were 0.54 in the first round, 0.96 in the second, and 0.99 in the third. The cost of the proposed method depends on the population structure. It is likely to be high for closely related animals but lower for populations where few animals are strongly related. Additional research is needed to identify near-sparsity in T and D to eliminate unimportant operations. [less ▲]

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See detailInside the Jupiter Main Auroral Emissions: Flares, Spots, Arc...and Satellite Footprints?
Bonfond, Bertrand ULg; Vogt, M. F.; Yoneda, M. et al

Conference (2011, July 11)

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See detailA recursive method of approximation of the inverse of genomic relationship matrix
Faux, Pierre ULg; Misztal, Ignacy; Gengler, Nicolas ULg

Conference (2011, July 11)

Approximation of the inverse of the genomic relationship matrix is obtained by a similar algorithm to that of the pedigree-based relationship matrix. A recursive use of this algorithm returns a better ... [more ▼]

Approximation of the inverse of the genomic relationship matrix is obtained by a similar algorithm to that of the pedigree-based relationship matrix. A recursive use of this algorithm returns a better approximation of the inverse after each round of recursion, until it reaches the real inverse. [less ▲]

Detailed reference viewed: 40 (6 ULg)
See detailMapping Jupiter's auroral features to magnetospheric sources: Comparing results from three different models for Jupiter's ionospheric magnetic field
Vogt, M. F.; Kivelson, M. G.; Khurana, K. K. et al

Conference (2011, July 11)

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See detailLe royaume de Mari et les Amorrites au 19ème siècle av.-JC
Colonna d'Istria, Laurent ULg

Conference (2011, July 11)

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See detailA capacity game in transportation management
Amand, Guillaume ULg; Arda, Yasemin ULg

Conference (2011, July 10)

This study analyzes the contractual relation between a retailer and a carrier with the aim of determining possible deviations from the optimal system performance. In order to face a random demand, the ... [more ▼]

This study analyzes the contractual relation between a retailer and a carrier with the aim of determining possible deviations from the optimal system performance. In order to face a random demand, the retailer submits a contract to the carrier based on the number of units transported and on the number of truck used. Then, before uncertainty is resolved, the carrier decides of the number of trucks that he reserves. Once the demand is known, the carrier may also request additional trucks at a higher cost. The result shows that the proposed contract does not coordinate the supply chain. [less ▲]

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See detailLegitimacy in social enterprises: is it also a question of governance?
Rijpens, Julie ULg

Conference (2011, July 09)

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See detailHow to measure quality in job transitions?
Levêque, Audrey ULg; Orianne, Jean-François ULg; Pichault, François ULg

Conference (2011, July 08)

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See detailManaging Hybridity: (Inter-)Organizational Strategies in the Fair Trade Field
Huybrechts, Benjamin ULg

Conference (2011, July 07)

This paper aims to examine the concrete strategies through which organizations may reach compromises between conflicting logics. To reach this goal, this paper tries to capture some of the interactions ... [more ▼]

This paper aims to examine the concrete strategies through which organizations may reach compromises between conflicting logics. To reach this goal, this paper tries to capture some of the interactions between the organizational, inter-organizational and field levels in terms of management and diffusion of plural logics, using the case of social enterprises in the Fair Trade field. [less ▲]

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See detailHorseshoeing styles comparison and detection of subclinic equine digit discomfort during movement
Noble, Prisca ULg; Lejeune, Jean-Philippe ULg; Serteyn, Didier ULg et al

Conference (2011, July 07)

Introduction: For the sound equine forelimb, ground reaction force (GRF) peaks to ~0.8-1 BodyWeight (BW) during the trot (4m/s). Little work investigates the effect of different horsehoeing styles ... [more ▼]

Introduction: For the sound equine forelimb, ground reaction force (GRF) peaks to ~0.8-1 BodyWeight (BW) during the trot (4m/s). Little work investigates the effect of different horsehoeing styles, directly on the limb GRF distribution and indirectly on the equine digit comfort during movement. This study investigates GRF distribution after application of different aluminium horseshoeing styles during movement. Methods: Two horses (H1,H2; mean 575kg) were used. However H2 had an old healed flexor tendons lesion, the horses were judged to be sound on locomotor examination (without lameness). According to the rules that respect the foot biomechanical balance, they were trimmed and shod with a non-broken foot-pastern axis. On the day of the tests, they were led on a treadmill at a trot (4m/s). Kinetics were collected, using a F-Scan system, during 3 following sessions : to both forehooves after application of classic roller, eggbarr and equi+ horseshoes. For each session, data from 3 strides for each left forelimb of each horse were averaged and kinetics (GRF) were obtained. Results: For the classic roller, eggbarr and equi+ horseshoes, GRF peaked respectively to 0.57+-0.006;0.36+-0.005;0.83+-0.009BW for H1 and 0.61+-0.007;0.84+-0.007;0.51+-0.009BW for H2. Theses horseshoes loading differences show a dynamic load transfer from the forelimbs to the hindlimbs, that is the result of a subclinic (without lameness) equine digit discomfort during movement. Conclusions: Subclinic equine digit discomfort after application of horshoes has been detected using the F-Scan system during movement. These results confirm the interest of the equi+ horseshoes on horses without flexor tendon lesion. [less ▲]

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See detailChoisir des cas exemplaires La Strategic litigation dans la lutte contre les discriminations liées à l’emploi en Belgique
Lejeune, Aude ULg; Orianne, Jean-François ULg

Conference (2011, July 07)

Dans plusieurs pays européens, les organismes publics nationaux de promotion de l’égalité des chances et de lutte contre les discriminations, appelés Equality Bodies, recourent à une pratique de « ... [more ▼]

Dans plusieurs pays européens, les organismes publics nationaux de promotion de l’égalité des chances et de lutte contre les discriminations, appelés Equality Bodies, recourent à une pratique de « Strategic litigation ». Inspirée par les pratiques anglo-saxonnes de common law, elle consiste à utiliser l’arène judiciaire pour faire avancer la jurisprudence dans certaines matières. Il s’agit plus précisément de sélectionner, parmi les cas individuels que traitent ces organismes, les dossiers qui sont exemplaires et qui pourront permettre aux magistrats de créer une jurisprudence positive dans certains domaines particuliers du droit. Au-delà de la contrainte budgétaire qui les empêche de défendre tous les cas, leur objectif est de se positionner comme un acteur stratégique en utilisant les cours et tribunaux comme des espaces d’action politique. Notre communication s’appuie sur une recherche de terrain qui traite des discriminations liées à l’emploi en Belgique. Notre matériau empirique se compose principalement d’entretiens et d’observations dans les deux centres chargés de la promotion de l’égalité des chances en Belgique (le Centre pour l’égalité des chances et la lutte contre le racisme et l’Institut pour l’égalité des femmes et des hommes) : entretiens de juristes de première et de seconde lignes, entretiens avec les plaignants, observation d’interactions aux « guichets » et au sein des équipes. En outre, nous avons réalisé une vaste analyse documentaire : consultation de dossiers depuis le dépôt de la plainte jusqu’au jugement, examen de rapports d’activité, de notes de travail internes aux services, etc. Enfin, nous avons procédé à des entretiens complémentaires d’avocats et de magistrats en charge de ces dossiers. Ce riche matériau nous permet d’analyser le processus de choix de cas exemplaires et ses implications. L’étude met tout d’abord en lumière les arguments auxquels se réfèrent les juristes qui sont amenés à sélectionner les dossiers en qualifiant certains cas « d’exemplaires ». Ensuite, elle examine l’articulation entre les revendications individuelles des plaignants, liées à leur propre histoire personnelle, avec les stratégies collectives de publicisation de ces centres. Enfin, elle interroge la stratégie judiciaire qui, dans un pays de droit continental, peut nourrir d’autres stratégies de lobbying politique en dehors des cours et tribunaux. [less ▲]

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See detailMorpho-Imaging : a veterinary website of anatomy and imaging
Noble, Prisca ULg; van Thielen, Bert; Verhelle, Filip et al

Conference (2011, July 07)

Introduction: The Morpho-Imaging website is based on an interactive multi-dimensional presentation of the anatomy and its relevant imaging. Its objective is to teach a practical approach of veterinary ... [more ▼]

Introduction: The Morpho-Imaging website is based on an interactive multi-dimensional presentation of the anatomy and its relevant imaging. Its objective is to teach a practical approach of veterinary anatomy that must be adapted to the clinician work. Methods: From domestic animals : imaging (Radiography, Magnetic Resonance Imaging, Computed Tomography and Echography) was performed and correspondant dissections (Osteology, Arthrology and Myology) were photographed. Morpho-Imaging and its content was produced using Adobe programs. It was hosted on the RVC1 multimedia platform and linked to the educational Philips iSiteTM Picture Archiving and Communication System (PACS) of the VUB5. Results: Morpho-Imaging consists of three major components named anatomy, imaging and pathological imaging. The pages are transversally and vertically connected with others, and always surmounted by a navigation bar with drop-down menus (DDM). The first DDM corresponds to the anatomy menu by species, the second and third DDMs correspond to the normal and pathological Imaging respectively. The Morpho-Imaging website is linked towards to WikiVet1 and the PACS5 by means of URL’s. Conclusion: The three dimensional viewing of anatomy and pathology is better presented using modern visualization tools and techniques, such as Volume Rendering Technique and Multi Planar Reconstruction. In addition, a real anatomic related atlas of multiple imaging sources is available for the users. Morpho-Imaging is a valuable tool used to challenge the cognitive process during training sessions of veterinary anatomy and imaging. [less ▲]

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See detailLes éco-quartiers : une alternative à l'étalement urbain ?
Halleux, Jean-Marie ULg; Strée, Julie ULg; Fiebig, B.

Conference (2011, July 07)

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See detailPrésentation d’une méthodologie d’évaluation qualitative de l’environnement sonore dans trois communes belges
Colon, Paul-Louis ULg

Conference (2011, July 06)

The paper presents a methodology of qualitative souyndscape assessment in three communities in Belgium. It aims to improve the management of environmental noise, taking into account the feeling and ... [more ▼]

The paper presents a methodology of qualitative souyndscape assessment in three communities in Belgium. It aims to improve the management of environmental noise, taking into account the feeling and experience of the sonic environment. After a brief presentation of the implementation of the project, I will present its theoretical assumptions and methodological difficulties and the prospects it opens. [less ▲]

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See detailIntervention en tant que "Grand Témoin"
Poumay, Marianne ULg

Conference (2011, July 06)

En clôture du séminaire de la DGSIP, cette intervention en tant que "Grand Témoin" retrace les éléments marquants de deux jours de conférence et les place en perspective de la situation belge.

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See detailLe SoTL en action : Une forme de recherche « en classe »
Poumay, Marianne ULg

Conference (2011, July 06)

Cette conférence introduit, puis illustre le courant SoTL (Scholarship of Teaching and Learning). Elle présente six recherches menées par des enseignants inscrits au Master Complémentaire "Formasup", de l ... [more ▼]

Cette conférence introduit, puis illustre le courant SoTL (Scholarship of Teaching and Learning). Elle présente six recherches menées par des enseignants inscrits au Master Complémentaire "Formasup", de l'Université de Liège, dans lequel chaque enseignant inscrit est appelé à mener une recherche à l'échelle de sa propre classe. Ces six illustrations sont présentées avec leurs impacts, ce qui permet une réflexion sur l'intérêt de ce type de recherche en classe et la façon dont il se distingue de la recherche en éducation. [less ▲]

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See detailAccompagner les enseignants à la pédagogie universitaire numérique : quelles questions ? Quelles commpétences ?
Poumay, Marianne ULg

Conference (2011, July 05)

Après avoir évoqué quelques principes liés à l'accompagnement des enseignants et posé les jalons du métier de conseiller pédagogique, la conférence se centre sur le conseil techno-pédagogique. Elle aborde ... [more ▼]

Après avoir évoqué quelques principes liés à l'accompagnement des enseignants et posé les jalons du métier de conseiller pédagogique, la conférence se centre sur le conseil techno-pédagogique. Elle aborde ensuite la façon d'aider les enseignants à devenir conseillers, pour terminer sur quelques défis, ou missions de ces conseillers. [less ▲]

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See detailRandom Handshaking and Information Recovery Between Scales and Models
Ghanem, Roger; Arnst, Maarten ULg; Phipps, Eric et al

Conference (2011, July 05)

Detailed reference viewed: 27 (4 ULg)
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See detailOverview of performance evaluation tools and their relevance to social enterprises
Mouchamps, Hugues ULg

Conference (2011, July 05)

This paper reviews a broad range of performance evaluation tools available for social enterprises and compare them. Therefore we develop an analytical framework based on the specificities of social ... [more ▼]

This paper reviews a broad range of performance evaluation tools available for social enterprises and compare them. Therefore we develop an analytical framework based on the specificities of social enterprises and on performance management theory. This framework incorporates the most relevant criteria that will allow to determine whether a tool includes the ideal characteristics to evaluate performance in social enterprises and to what extent. Three of the most representative and widespread tools, the balanced scorecard, the social return on investment and the global reporting initiative framework, are then studied and compared through this analytical framework. [less ▲]

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See detailRegional scale groundwater flow and transport modelling: from conceptual challenges to pragmatic numerical solutions
Wildemeersch, Samuel ULg; Goderniaux, Pascal ULg; Leroy, Mathieu et al

Conference (2011, July 05)

National and international regulations require the management of groundwater resources at the regional scale, considering the physical limits of hydrogeological systems. Physically-based, spatially ... [more ▼]

National and international regulations require the management of groundwater resources at the regional scale, considering the physical limits of hydrogeological systems. Physically-based, spatially-distributed groundwater flow and transport models allow representing in a realistic and reliable way the dynamics of regional groundwater systems and processes and accounting for negative or positive feedbacks induced by a changed stress factors or particular measures set up in the basin such as increase in pumping, use of fertilizers or artificial recharge. Such models are complex and their development and implementation are challenging for several reasons related to numerical difficulties but also to data acquisition and management, conceptualization, calibration and validation. Variably-saturated, regional flow and transport models have been developed using two finite element simulators SUFT3D and HydroGeoSphere specifically suited to regional-scale applications. A complex synthetic case has been used as a reference model to test the impact on predictions made and computing times of various conceptual and technical choices such as spatial and time discretization, simplified unsaturated laws or boundary conditions. Real cases have been developed for regional groundwater bodies (from 500 to 1700 km²) to deliver relevant information such as the estimation and evolution with time of groundwater reserves, under different stress conditions such as climate changes and for the evaluation of regional groundwater quality status and nitrate trend assessment under alternative management scenarios and mitigation measures. Results provide guidelines for the conceptualisation, the calibration and the use of regional-scale groundwater flow and transport models for decision making. [less ▲]

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See detailFinite element simulation of canine humeral condylar fractures
D'Otreppe, Vinciane ULg; Böhme, Béatrice; Balligand, Marc ULg et al

Conference (2011, July 04)

Humeral condylar fractures are common in dogs. Different types of fractures (lateral, medial, bicondylar) may occur, depending on the age of the dog and the position of its elbow during the impact. The ... [more ▼]

Humeral condylar fractures are common in dogs. Different types of fractures (lateral, medial, bicondylar) may occur, depending on the age of the dog and the position of its elbow during the impact. The goal of this work is to understand the effects of bone posture and skeletal development on canine humeral fractures by means of the finite element method. Four distinct finite element simulations were performed, corresponding to an immature and a mature dog elbow, respectively in extension and flexion. To create the finite element models, subject-specific finite element meshes were extracted from the CT-data. Appropriate material properties were used for cortical bone, trabecular bone and cartilage. The modified Mohr-Coulomb failure criterion was implemented to take account for strength asymmetry. Lateral humeral fractures are obtained for both the young and adult dog elbow, in extension and flexion. This is in agreement with clinical observations, in which lateral condylar fractures are most common. [less ▲]

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See detailManagers’ competences in social enterprises: what specificities?
Moreau, Charlotte ULg; Mertens de Wilmars, Sybille ULg

Conference (2011, July 04)

In any enterprise, the manager keeps a determining and real leeway which is susceptible to stimulate, give directions to the organization (Pichault, 2009), and is determining in the capability to innovate ... [more ▼]

In any enterprise, the manager keeps a determining and real leeway which is susceptible to stimulate, give directions to the organization (Pichault, 2009), and is determining in the capability to innovate (King, 1990; Osborne, 1998; Schin & McClomb, 1998). That leadership style needs therefore to be adapted to the specific internal context of the organization (Schmid, 2006). The paper examines what are the specific competencies of the manager in social enterprises, by constructing a competencies model, the emblematic tool of the competence-based management, relevant to social enterprises (Collin & Grasser, 2007; Retour & Rapiaux, 2006; Oiry & Sulzer, 2002). Our hypothesis is standing that certain competencies mobilized by managers in social enterprises are specific, regarding to the particular internal and external context of social enterprises, etc. First of all, we propose a theoretical competencies model for the managers in social enterprises, based on a review of the literature and the conduction of 12 semi-structured interviews of experts and managers. Then, we propose a competencies model for the manager in social enterprises. Finally, group interviews with some managers of social enterprises are conducted in various European countries as this research takes place in a European research on long-life learnings. [less ▲]

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See detailSudden crash or long torture: the timing of market reactions to operational loss events
Muller, Aline ULg; Biell, Elizabeth

Conference (2011, July 01)

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See detailPara una sociología de las posesiones : El papel de las tecnicas dentro del reconocimiento identaria
Melard, François ULg

Conference (2011, July)

Este coloquio tiene por tema inaugural: “la Ciencia y la tecnologiá para la inclusión social”. Mi contribución va a intentar alimentar nuestra reflexión sobre teoría/ciencia y técnica/democracia (en el ... [more ▼]

Este coloquio tiene por tema inaugural: “la Ciencia y la tecnologiá para la inclusión social”. Mi contribución va a intentar alimentar nuestra reflexión sobre teoría/ciencia y técnica/democracia (en el sentido de la construcción de la ciudadanía). Cómo pensar grupos que no tiene todavía una realitad estabilizada en la sociedad y que se definen por medio de su relación con non-humanos ? Para esto, voy a poner en el centro de mi intervención el papel que pueden jugar las ciencias y las técnicas en la producción de nuevo modos de existencias, pero sobre todo de hacerlo proponiendo un marco teórico ad hoc. En este sentido, se trata aún más de proponer un programa de investigación que de presentar resultados de un análisis. Las cuestiones que lo animan proceden de un campo de investigación en plena extensión: las controversias medioambientales… con sus complejidades y sus urgencias. [less ▲]

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See detailDe quoi est fait le temps judiciaire? Réflexions provisiores sur la question de l'accélération à partir d'une étude comparative.
Bastard, Benoit; Delvaux, David ULg; Mouhanna, Christian et al

Conference (2011, July)

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See detailHow many species in the Black rat complex (Rattus rattus sensu lato) in Southeast Asia?
Pagès, Marie ULg; Galan, Maxime; Chaval, Yannick et al

Conference (2011, July)

Black rats are among the major invasive vertebrates with severe ecological, economic and health impacts. Remarkably, the evolutionary history of black rats has received little attention and there is no ... [more ▼]

Black rats are among the major invasive vertebrates with severe ecological, economic and health impacts. Remarkably, the evolutionary history of black rats has received little attention and there is no firm agreement as how many species should be recognized within the Rattus rattus complex. Members of the species complex are native from India and Southeast Asia. Current taxonomy suggests that four taxa live in sympatry in several places of Thailand and Cambodia where the present study was conducted: three accepted species (R. tanezumi, R. losea, R. argentiventer) and an additional lineage of unclear taxonomic status sometimes referred as Rattus R3. We used an extensive sampling, morphological data and diverse genetic markers of different evolutionary rates and parental inheritance (two mtDNA genes, one nuclear gene and eight microsatellite loci) to assess the genetic structure among the four taxa. Genetic analyses revealed discordant patterns between the mt and the nuclear data. The mt phylogeny identified three reciprocally monophyletic clades corresponding to the four putative taxa while the nuclear phylogeny failed to separate tanezumi and R3. Within geographic localities, microsatellites revealed free gene flow between tanezumi and R3 but no gene flow between those two taxa and losea or argentiventer. Altogether theses analyses do not support the taxon R3 as a valid species and advocate for synonymy with tanezumi. As a consequence, R. tanezumi becomes paraphyletic with respect to losea. Simulation analyses are now ongoing to determine whether a recent speciation event between tanezumi and losea, or an incomplete lineage sorting within tanezumi could explain this uncommon pattern. [less ▲]

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See detailAurora : Global features
Gérard, Jean-Claude ULg

Conference (2011, July)

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See detailDelivering bad news to customers: The role of employee emotional and technical competences
Delcourt, Cécile ULg; Van Riel, Allard ULg; van Birgelen, Marcel et al

Conference (2011, July)

Detailed reference viewed: 38 (7 ULg)
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See detailMultidimensional GCxGC Fingerprinting for Environmental and Biological Forensics
Patterson Jr; Sandau; Focant, Jean-François ULg

Conference (2011, July)

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See detailImmunogenetics as a tool to assess Hantavirus risk in wild rodents
Guivier, Emmanuel; Galan, Maxime; Pagès, Marie ULg et al

Conference (2011, July)

Immunogenetics, the analysis of genetic polymorphisms in specific recognition and immune regulation, is at the core of the study of host-parasite coevolution. We present here a synthesis of our recent ... [more ▼]

Immunogenetics, the analysis of genetic polymorphisms in specific recognition and immune regulation, is at the core of the study of host-parasite coevolution. We present here a synthesis of our recent works based on immune gene polymorphism to illustrate the power of this approach in improving our knowledge of rodent / hantavirus interactions. Two candidate genes (encoding Mx2 protein and β3 integrin) were first investigated at the inter-specific level. Sequence and/or expression polymorphism were compared among twenty murid species, some of them being reservoirs and some others being non reservoirs of hantaviruses. Our results showed that SNPs as well as patterns of selection acting on these genes differed between these rodent species and could mediate their susceptibility to hantaviruses. Four candidate genes (Mx2 gene and three genes from the Major Histocompatibility Complex) were next analyzed among populations of bank voles (Myodes glareolus), the reservoir of Puumala virus (PUUV). We revealed the existence of positive associations between Mhc alleles and PUUV infection in one hand and negative relationships between Tnf-α or Mx2 expression levels and PUUV prevalence in the other hand. These results suggested that tolerance to PUUV could have evolved in endemic areas. Such tolerance could be selected in response to the costs of immune responses that are activated against PUUV. We will conclude on the advantages to combine this immune gene candidate approach with more recent analyses based on genome scan, to deepen our investigation of this intra- and inter-specific variability of rodent tolerance / susceptibility to hantaviruses. [less ▲]

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See detailImplications of tribimaximal lepton mixing for leptogenesis
Aristizabal Sierra, Diego ULg

Conference (2011, July)

In models featuring exact mixing patterns the mass matrices that define the effective light neutrino mass matrix -and the light neutrino matrix itself- are form-diagonalizable. We study leptogenesis in ... [more ▼]

In models featuring exact mixing patterns the mass matrices that define the effective light neutrino mass matrix -and the light neutrino matrix itself- are form-diagonalizable. We study leptogenesis in type I seesaw models in these contexts pointing out that the CP asymmetry in right-handed neutrino decays vanishes as a consequence of the mass matrices being form-diagonalizable. A non-vanishing CP asymmetry arises once deviations from the exact mixing scheme, induced by higher order effective operators, is allowed. Finally we discuss alternative pathways to viable leptogenesis in these kind of models. [less ▲]

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See detailhave/be no need: the interaction between negation and modality in verbonominal pathways of changes
Brems, Lieselotte ULg; davidse, kristin; van linden, an

Conference (2011, July)

We investigate how modal meanings can emerge in nominal patterns, an under-researched source construction for modal meanings. We specifically look at how the combination of the noun need/needs with ... [more ▼]

We investigate how modal meanings can emerge in nominal patterns, an under-researched source construction for modal meanings. We specifically look at how the combination of the noun need/needs with negation markers of various kinds leads to such modal meanings related to the deontic and epistemic domain. [less ▲]

Detailed reference viewed: 32 (2 ULg)
Peer Reviewed
See detailGlobal multivariate analysis of the plant life history: a reflection about the concept of evolutionary success
Cascales - Miñana, Borja ULg; Cleal, Christopher J.; Diez, José B.

Conference (2011, July)

Detailed reference viewed: 10 (0 ULg)
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Peer Reviewed
See detailImproving 3D measurements accuracy with camera information redundancy
Schwartz, Cédric ULg; Fringuellini, Anthony ULg; Bruls, Olivier ULg et al

Conference (2011, July)

The accuracy of the Codamotion system for 3D measurement depends mainly on the signal level of the sensors and the resolution of the system at the marker localization. When using several units to cover a ... [more ▼]

The accuracy of the Codamotion system for 3D measurement depends mainly on the signal level of the sensors and the resolution of the system at the marker localization. When using several units to cover a large field of view, the estimated position of the different units might differ. We propose a method taking both resolution and signal level in to account, instead of only the signal level as in the built-in weighting process. This new method offers improved accuracy. [less ▲]

Detailed reference viewed: 122 (32 ULg)