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See detailThe influence of laboratory-induced Meld score differences on liver allocation: more reality than myth.
Schouten, J. N.; Francque, S.; Van Vlierberghe, H. et al

in Clinical Transplantation (2012), 26(1), 62-70

Background: Liver allocation in Eurotransplant (ET) is based on the MELD score. Interlaboratory MELD score differences in INR and creatinine determination have been reported. The clinical implication of ... [more ▼]

Background: Liver allocation in Eurotransplant (ET) is based on the MELD score. Interlaboratory MELD score differences in INR and creatinine determination have been reported. The clinical implication of this observation has not been demonstrated. Methods: MELD scores were calculated in 66 patients with liver cirrhosis using bilirubin, creatinine, and INR analyzed in six liver transplant centers. Based on allocation results of ET, patients transplanted from December 2006 to June 2007 were divided according to MELD score in four groups. For each group, the influence of the match MELD on the probability of receiving a transplant was studied (Cox proportional hazards model). Results: Laboratory-dependent significant differences in MELD score were demonstrated. Cox proportional hazards model showed a significant association between MELD score and the probability of organ allocation. The unadjusted hazard ratio for receiving a liver transplant was significantly different between group 2 and group 4 (group 2: MELD 19–24; group 4: MELD > 30). Conclusion: Laboratory-dependent significant differences in MELD score were observed between the six transplant centers. We demonstrated a significant association between the MELD score and the probability of organ allocation. The observed interlaboratory variation might yield a significant difference in organ allocation in patients with high MELD scores. [less ▲]

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See detailGestion de la diversité: nouveaux enjeux
Cornet, Annie ULg

Conference (2012, January)

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See detailConception d'un référentiel comme colonne vertébrale d'un Master en alternance en génie analytique
Dupont, Chantal ULg; Francois, Dominique ULg; Walravens, Thérèse et al

in Actes du 24e colloque de l’Admée-Europe : L’évaluation des compétences en milieu scolaire et en milieu professionnel (2012, January)

Confrontée au défi d’adapter sa formation, un master en alternance en génie analytique, à la réalité et aux besoins émergents des industries, l’équipe de coordination a entrepris de définir un référentiel ... [more ▼]

Confrontée au défi d’adapter sa formation, un master en alternance en génie analytique, à la réalité et aux besoins émergents des industries, l’équipe de coordination a entrepris de définir un référentiel de compétences. Cette communication présente la méthodologie utilisée pour élaborer ce référentiel et décrit le dispositif de formation ainsi que les nécessaires ajustements à réaliser pour veiller à sa cohérence. Elle met en évidence les implications d’une telle réflexion aussi bien au niveau institutionnel que pédagogique. [less ▲]

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See detailTables de contingence à trois dimensions : aspects théoriques, applications et analogie avec l'analyse de la variance à trois critères de classification
Claustriaux, Jean-Jacques ULg; Palm, Rodolphe ULg; Ferrandis Vallterra, Salvador ULg et al

in Notes de Statistique et d'Informatique (2012), (1), 19

For contingency table, concepts of independence are not so easy to understand in statistical practice. So, theoretical aspects of the log-linear model are described and applied to a three levels example ... [more ▼]

For contingency table, concepts of independence are not so easy to understand in statistical practice. So, theoretical aspects of the log-linear model are described and applied to a three levels example; an analogy with analysis of variance is also established. [less ▲]

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See detailSynthesis of star and H-shape polymers via a combination of cobalt-mediated radical polymerization and nitrone mediated radical coupling reactions
Detrembleur, Christophe ULg; Debuigne, Antoine ULg; Altintas, Ozcan et al

in Polymer Chemistry (2012), 3(1), 135-147

Via consecutive cobalt-mediated radical polymerization (CMRP), nitrone-mediated radical coupling (NMRC) and copper catalyzed azide-alkyne cycloaddition (CuAAC), polymers with mikto-arm star and H-shape ... [more ▼]

Via consecutive cobalt-mediated radical polymerization (CMRP), nitrone-mediated radical coupling (NMRC) and copper catalyzed azide-alkyne cycloaddition (CuAAC), polymers with mikto-arm star and H-shape architecture were synthesized. Poly(vinyl acetate)40-block-poly(acrylonitrile)78-Co(acac)2 polymers were synthesized via CMRC and subsequently coupled using an alkyne functional nitrone. The coupling efficiency of the NMRC process was assessed employing N-tert-butyl a-phenyl nitrone (PBN), which is structurally very similar to the later employed coupling agent. Generally, coupling efficiencies of close to 90% or higher were observed in all cases. Since the coupling reaction yields triblock copolymers bearing an alkoxyamine functionality (and thus also an alkyne group) in the middle of the chain, well defined PEG conjugates could be obtained via CuAAC. Miktoarm star polymers of the structure (PVAc-b-PAN)2-PEG were generated as well as H-shaped material of the structure (PVAc-b-PAN)2-PEG-(PVAc-b-PAN)2 via conjugation with bifunctional PEG. In all cases, very narrow molecular weight material was obtained. Molecular weight analysis of the intermediate and the final products reveals that the hydrodynamic volume of the miktoarm star and the H-shaped materials is not substantially increased during the final conjugation reaction despite the fact that the absolute molecular weight increases by more than a factor of two in the latter case. Success of the conjugation reactions was confirmed via composition analysis via NMR. [less ▲]

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See detailConsumer valuation of improved rice parboiling technologies in Benin
Matty, Demont; Zossou, Enangnon ULg; Pieter, Rutsaert et al

in Food Quality & Preference (2012), 23(1), 63-70

In Benin, traditional parboiling is still widely practiced among rice processors, resulting in inferior grain quality. A new parboiler was introduced to improve the milling yield and intrinsic quality of ... [more ▼]

In Benin, traditional parboiling is still widely practiced among rice processors, resulting in inferior grain quality. A new parboiler was introduced to improve the milling yield and intrinsic quality of local rice. We conducted Vickrey second price auctions to elicit rural Beninese consumers’ willingness to pay for rice obtained through the new parboiler and two locally innovated parboilers. The individual auctions were followed by a group discussion during which consensus was reached on socially acceptable prices. Relative to traditionally parboiled rice, consumers were willing to pay price premiums of 9–13% for rice obtained through a local parboiler using a container of which the bottom is a perforated metal, 27% for rice obtained through a local parboiler using wooden sticks at the bottom of the pot, and 25–34% for rice parboiled through the improved parboiler. Bids were influenced by the presentation order of the products according to perceived quality. Bids were also higher when participants had been informed on the benefits of improved parboiling techniques, which is a crucial insight for developing marketing and communication strategies for this improved quality product. Group bids were not significantly different from individual bids which suggests that the latter are within the range of socially acceptable prices defined through group consensus. [less ▲]

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See detailMiR-146a an angiostatic miRNA elevated in peripartum cardiomyopathy
Halkein, Julie ULg; Tabruyn, Sébastien ULg; Haghikia, Arash et al

Poster (2012, January)

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See detailLongitudinal field study on bovine Babesia spp. and Anaplasma phagocytophilum infections during a grazing season in Belgium
Lempereur, Laetitia ULg; Lebrun, Maude; Cuvelier, Pascale et al

in Parasitology Research (2012), 110(4), 1525-1530

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See detailALE Simulations of Metal Forming Processes
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Akhtar S. Khan; Farhoud Kabirian; Jian Liu (Eds.) Non-linear Response of Conventional & Advanced Materials, and Multi-scale Modeling (2012, January)

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See detailPlurilinguismes à la Renaissance italienne
Moreno, Paola ULg

in Culture, le Magazine Culturel de l'Université de Liège (2012)

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See detailTable ronde : Comment assurer l’évaluation diagnostique des compétences scolaires ?
Fagnant, Annick ULg; Dierendonck, Christophe

Conference (2012, January)

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See detailContribution of GC×GC-TOFMS to tobacco analysis
Brokl, Michal ULg; Bishop; Liu et al

Conference (2012, January)

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See detailNumerical computations of hypersonic boundary layer roughness induced transition on a at plate
Serino, Gennaro ULg; Pinna, Fabio; Rambaud, Patrick et al

Scientific conference (2012, January)

The work is focused on numerical simulations of roughness induced transition for hypersonic ow on a at plate wall mounted roughness element. Numerical simulations are compared to experimental results in ... [more ▼]

The work is focused on numerical simulations of roughness induced transition for hypersonic ow on a at plate wall mounted roughness element. Numerical simulations are compared to experimental results in order to resemble the physics highlighted in the tests. In particular, stress has been placed on the detection of the vortices in the wake behind the roughness element and on the onset of transition. [less ▲]

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See detailMultilocus-based phylogeny and species recognition within the cosmopolitan Peltigera neopolydactyla-dolichorhiza complex
Magain, Nicolas ULg; Miadlikowska, Jolanta; Lutzoni, François et al

Poster (2012, January)

The Peltigera neopolydactyla/dolichorhiza complex is broadly distributed, growing in boreal and temperate regions from northern Norway to southern Chile, as well as in tropical mountains. Observed ... [more ▼]

The Peltigera neopolydactyla/dolichorhiza complex is broadly distributed, growing in boreal and temperate regions from northern Norway to southern Chile, as well as in tropical mountains. Observed morphotype and chemotype variation within this complex suggested the presence of multiple undescribed species. We inferred the phylogeny of Peltigera section Polydactylon with a special focus on the Peltigera neopolydactyla/dolichorhiza complex to determine the full breadth of this species complex, and to assess if taxa from different parts of the worlds but with similar morphological features share a most recent common ancestor. About 525 ITS sequences representing 104 distinct haplotypes were generated for representatives of Peltigera section Polydactylon. We selected a representative of each broadly defined phylotype for which three protein-coding loci: RPB1.1, b-tubulin and EFT2.1 were sequenced. Each of the three protein coding loci provided equivalent or more resolution and support than the ITS locus. The greatest proportion of significantly supported nodes across the tree resulted from β-tubulin alone. Many specimens identified as P. neopolydactyla and P. dolichorhiza are placed outside of this species complex. As currently defined both species represent polyphyletic assemblages of taxa including several potentially undescribed species. Our phylogenies suggest the presence of putatively new species within several complexes across the section. [less ▲]

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See detailLes PCB non apparentés aux dioxines (non dioxin-like PCB) dans les denrées alimentaires et les aliments pour animaux: mise en place d'une législation européenne
Eppe, Gauthier ULg

Article for general public (2012)

La famille des PolyChloroBiphényles ou PCB regroupe un ensemble de 209 composés différents (dénommés usuellement congénères) se différenciant par le nombre (1 à 10 atomes) et la position des atomes de ... [more ▼]

La famille des PolyChloroBiphényles ou PCB regroupe un ensemble de 209 composés différents (dénommés usuellement congénères) se différenciant par le nombre (1 à 10 atomes) et la position des atomes de chlore sur la molécule biphényle. Cette famille de composés peut être divisée en deux catégories selon leurs propriétés toxicologiques, et plus particulièrement les effets tératogènes des PCB. Le premier groupe, composé de 12 congénères, se caractérise par des propriétés toxicologiques similaires aux dioxines, et il est par conséquent désigné par le terme ‘PCB de type dioxine’ (dioxin-like PCB, DL-PCB). L’autre groupe de PCB non apparenté aux dioxines (non dioxin-like PCB, NDL-PCB), présente d’autres mécanismes de toxicité pris en compte dans la gestion du risque PCB. Parmi ces 197 NDL-PCB, une sous-catégorie de six congénères relativement abondants dans l’environnement et dans les chaînes alimentaires (PCB 28, 52, 101, 138, 153 et 180), représente ce que nous appelons communément les PCB indicateurs. De par leurs propriétés de persistance, de bioaccumulation et de biomagnification, l’ensemble des PCB (DL-PCB et NDL-PCB) se retrouve fréquemment dans l’alimentation humaine et dans les aliments pour animaux. La fixation de teneurs maximales en NDL-PCB dans divers aliments fait l’objet d’une nouvelle réglementation européenne qui entrera en vigueur dès 2012. Cet article fait le point sur l’impact de ces nouvelles propositions par rapport au niveau de bruit de fond des principales classes d’aliments mais également sur l’évolution des méthodes d’analyse nécessaires pour atteindre les performances requises. [less ▲]

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See detailHigher-Moment Risk Exposures in Hedge Funds
Lambert, Marie ULg; Hübner, Georges ULg; Papageorgiou, Nicolas

Conference (2012, January)

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See detailDynamic Prediction of Energy Delivery Capacity of Power Networks : Unlocking the Value of Real-Time Measurements.
Schell, Peter; Jones, Lauren; Mack, Philippe et al

in Proceedings of the third IEEE PES Conference on Innovative Smart Grid Technologies (2012, January)

This paper describes recent advances in prediction software using advanced data-mining tools, and shows how this can significantly increase the operational value of the data gathered. These new tools ... [more ▼]

This paper describes recent advances in prediction software using advanced data-mining tools, and shows how this can significantly increase the operational value of the data gathered. These new tools allow for new operational procedures to be defined that increase the usages of the network without decreasing security of supply. We will use the example of dynamic line rating, i.e. determining the thermal rating of an overhead line based on real-time environmental parameters (temperature, wind speed & direction and solar radiation) to highlight how the use of numerical data-mining tools can help us reliably predict future behavior of power networks. [less ▲]

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See detailApplication of the restoring force surface method to a real-life spacecraft structure
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg; Newerla, Alfred

in Proceedings of the International Modal Analysis Conference (IMAC) XXX (2012, January)

Many nonlinear system identification methods have been introduced in the technical literature during the last thirty years. However, few of these methods were applied to real-life structures. In this ... [more ▼]

Many nonlinear system identification methods have been introduced in the technical literature during the last thirty years. However, few of these methods were applied to real-life structures. In this context, the objective of the present paper is to demonstrate that the Restoring Force Surface (RFS) method can provide a reliable identification of a nonlinear spacecraft structure. The nonlinear component comprises an inertia wheel mounted on a support, the motion of which is constrained by eight elastomer plots and mechanical stops. Several adaptations to the RFS method are proposed, which include the elimination of kinematic constraints and the regularization of ill-conditioned inverse problems. The proposed methodology is demonstrated using numerical data. [less ▲]

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