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See detailAssessing spatio-temporal variability and trends in modelled and measured Greenland Ice Sheet albedo (2000–2013)
Alexander, P.; Tedesco, M.; Fettweis, Xavier ULg et al

in Cryosphere (The) (2014), 8

Accurate measurements and simulations of Greenland Ice Sheet (GrIS) surface albedo are essential, given the role of surface albedo in modulating the amount of absorbed solar radiation and meltwater ... [more ▼]

Accurate measurements and simulations of Greenland Ice Sheet (GrIS) surface albedo are essential, given the role of surface albedo in modulating the amount of absorbed solar radiation and meltwater production. In this study, we assess the spatio-temporal variability of GrIS albedo during June, July, and August (JJA) for the period 2000–2013. We use two remote sensing products derived from data collected by the Moderate Resolution Imaging Spectroradiometer (MODIS), as well as outputs from the Modèle Atmosphérique Régionale (MAR) regional climate model (RCM) and data from in situ automatic weather stations. Our results point to an overall consistency in spatio-temporal variability between remote sensing and RCM albedo, but reveal a difference in mean albedo of up to ~0.08 between the two remote sensing products north of 70° N. At low elevations, albedo values simulated by the RCM are positively biased with respect to remote sensing products by up to ~0.1 and exhibit low variability compared with observations. We infer that these differences are the result of a positive bias in simulated bare ice albedo. MODIS albedo, RCM outputs, and in situ observations consistently indicate a decrease in albedo of −0.03 to −0.06 per decade over the period 2003–2013 for the GrIS ablation area. Nevertheless, satellite products show a decline in JJA albedo of −0.03 to −0.04 per decade for regions within the accumulation area that is not confirmed by either the model or in situ observations. These findings appear to contradict a previous study that found an agreement between in situ and MODIS trends for individual months. The results indicate a need for further evaluation of high elevation albedo trends, a reconciliation of MODIS mean albedo at high latitudes, and the importance of accurately simulating bare ice albedo in RCMs. [less ▲]

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See detailPsychopathie, adaptation et traitement du stimulus émotionnel
Grandjean, Sylvie; Englebert, Jérôme ULg

Scientific conference (2014, December 11)

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See detailLaïcité à la française : de la prétention universaliste à l'obsession identitaire
Jacquemain, Marc ULg

Conference (2014, December 11)

Le mot "laïcité" est revendiqué par des groupes d'extrême-droite ouvertement racistes et conspirationnistes comme "Riposte laïque". L'article montre que le même imaginaire conspirationniste, sous la même ... [more ▼]

Le mot "laïcité" est revendiqué par des groupes d'extrême-droite ouvertement racistes et conspirationnistes comme "Riposte laïque". L'article montre que le même imaginaire conspirationniste, sous la même structure narrative peut être retrouvé sous des formes débarrassée de leur racisme explicite dans des textes considérés comme "mainstream" au sein de la laïcité, en analysant un texte du Rappel. A partir de là, on tente de montrer que cette "dérivation conspirationniste" peut trouver des prises dans des formulations "progressistes" de la laîcité dès lors que ces formulations partent pour point de départ le point de vue à la fois holiste et idéaliste d'un "laos" toujours-dejà-là, comme chez Peña ruiz [less ▲]

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See detailCystic Fibrosis screening by simultaneous ELISA for IRT1 and PAP proteins. A pilot study.
BOEMER, François ULg

Scientific conference (2014, December 11)

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See detailImprovement of cellulose anaerobic digestion
Kinet, Romain ULg

Scientific conference (2014, December 11)

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See detailLa littérature contemporaine sur 14-18 adressée aux jeunes francophones: entre pacifisme militant et vision unilatérale du conflit
Delbrassine, Daniel ULg

Conference given outside the academic context (2014)

Analyse d'un corpus contemporain d'œuvres françaises adressées à la jeunesse et axées sur la guerre de 14-18. Mise en évidence de quelques phénomènes: unilatéralisme de la vision, transmission d'une ... [more ▼]

Analyse d'un corpus contemporain d'œuvres françaises adressées à la jeunesse et axées sur la guerre de 14-18. Mise en évidence de quelques phénomènes: unilatéralisme de la vision, transmission d'une mémoire stéréotypée et lacunaire, statut documentaire de ces textes. [less ▲]

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See detailRGD surface functionalization of the hydrophilic acrylic intraocular lens material to control posterior capsular opacification
Huang, Yi-Shiang ULg; Bertrand, Virginie ULg; Bozukova, Dimitriya et al

in PLoS ONE (2014), 9(12), 32

Posterior Capsular Opacification (PCO) is the capsule fibrosis developed on implanted IntraOcular Lens (IOL) by the de-differentiation of Lens Epithelial Cells (LECs) undergoing Epithelial Mesenchymal ... [more ▼]

Posterior Capsular Opacification (PCO) is the capsule fibrosis developed on implanted IntraOcular Lens (IOL) by the de-differentiation of Lens Epithelial Cells (LECs) undergoing Epithelial Mesenchymal Transition (EMT). Literature has shown that the incidence of PCO is multifactorial including the patient’s age or disease, surgical technique, and IOL design and material. Reports comparing hydrophilic and hydrophobic acrylic IOLs have shown that the former has more severe PCO. On the other hand, we have previously demonstrated that the adhesion of LECs is favored on hydrophobic compared to hydrophilic materials. By combining these two facts and contemporary knowledge in PCO development via the EMT pathway, we propose a biomimetically inspired strategy to promote LEC adhesion without de-differentiation to reduce the risk of PCO development. By surface grafting of a cell adhesion molecule (RGD peptide) onto the conventional hydrophilic acrylic IOL material, the surface-functionalized IOL can be used to reconstitute a capsule-LEC-IOL sandwich structure, which has been considered to prevent PCO formation in literature. Our results show that the innovative biomaterial improves LEC adhesion, while also exhibiting similar optical (light transmittance, optical bench) and mechanical (haptic compression force, IOL injection force) properties compared to the starting material. In addition, compared to the hydrophobic IOL material, our bioactive biomaterial exhibits similar abilities in LEC adhesion, morphology maintenance, and EMT biomarker expression, which is the crucial pathway to induce PCO. The in vitro assays suggest that this biomaterial has the potential to reduce the risk factor of PCO development. [less ▲]

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See detailImpact of net metering programs on optimal load management in US residential housing – a case study
Georges, Emeline ULg; Braun, J. E.; Groll, E. et al

in Proceedings of 9th International Conference on System Simulation in Buildings (2014, December 11)

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See detailSur quelques conditions médiatiques de la posture néo-réactionnaire
Durand, Pascal ULg

Conference (2014, December 10)

Ceux qu'il est convenu de rassembler sous l'étiquette sans doute trop extensible de « Nouveaux Réactionnaires » appartiennent pour la plupart à un système inséparablement journalistique et éditorial, dans ... [more ▼]

Ceux qu'il est convenu de rassembler sous l'étiquette sans doute trop extensible de « Nouveaux Réactionnaires » appartiennent pour la plupart à un système inséparablement journalistique et éditorial, dans lequel c’est avec une grande symétrie que se répondent et se rencontrent, d’un coté, des « intellectuels médiatiques », auteurs d’essais à rotation rapide leur garantissant de fortes couvertures de presse et un fort taux de présence dans les émissions de radio et de télévision et, de l’autre côté, des journalistes prolongeant leur propre activité par des recueils de chroniques ou des ouvrages sur des questions de politique ou de société. L’intersection de plus en plus forte de l’univers des médias, de l’univers de l’édition et de l’univers intellectuel est d’autant moins étrangère à ce courant de pensée et de discours que certains de ses représentants les plus visibles apparaissent à l’évidence comme les produits de cette intersection même. Les logiques à l’œuvre dans cette intersection sont bien connues : elles vont de l’emprise croissante de la télévision sur le champ journalistique à l’emprise à son tour croissante de ce champ sur l’univers de la production éditoriale et intellectuelle (comme encore sur les formes du débat et de la représentation politiques). L'objet de la présente communication est de mettre en évidence que la nouvelle parole pamphlétaire semble bien avoir trouvé, dans ce nouvel écosystème discursif dominé par le médium télévisuel et notamment les dispositifs du talk show, les conditions idéales à sa propre montée en force et à la propagation de ses effets. [less ▲]

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See detailIntegrating phylogenetic and environmental niche models to explore speciation mechanisms in the Erythrophleum genus in tropical Africa
Gorel, Anaïs ULg; Fayolle, Adeline ULg; Doucet, Jean-Louis ULg et al

Conference (2014, December 10)

In the context of global climate change, it is of primary importance to understand the species response to climate (habitat tracking or adaptation). In this study we investigated the evolutionary history ... [more ▼]

In the context of global climate change, it is of primary importance to understand the species response to climate (habitat tracking or adaptation). In this study we investigated the evolutionary history of the climatic niche between and within closely related tropical tree species of the Erythrophleum genus (Fabaceae, Caesalpinioideae): E. ivorense, E. suaveolens and E. africanum. Two major hypotheses, the refuge theory and the ecological gradient hypothesis, have been developed to explain the current distribution of tree clades across tropical Africa. To identify the speciation mechanisms, we used a combination of geographic data and environmental factors to quantify the degree of niche conservatism (or divergence). We used two sets of distribution data for the purpose of this study. Species distribution data for the whole of tropical Africa were gathered from herbarium records. Distribution data of the two sister species E. ivorense and E. suaveolens assigned to genetic cluster were available for the lowland tropical forests of western and central Africa. Using a Species Distribution Model (SDM) approach based on MaxEnt algorithm, we tested for the environmental differences (BIOCLIM data) between species and genetic clusters within species. We developed SDMs for each of the three Erythrophleum species (over the whole range) and for each of the five genetic clusters. We quantified the niche overlap using new niche similarity metrics. At species level, the climatic niches differed significantly and overlapped only sligthly, suggesting a parapatric speciation along a climatic gradient. Within the two sister species, the niche of the parapatric central African clusters strongly overlapped, suggesting a secondary contact following the recolonization from different forest refugia. The west African cluster however showed contrasted climatic niches possibly due to either recent (< 100 yrs) climate change in west Africa, or ongoing differentiation on the dry part of the climatic gradient. [less ▲]

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See detailBiopesticides: quand les biotechs se mettent au service d’une agriculture durable
Zune, Quentin ULg; Ongena, Marc ULg

Scientific conference (2014, December 10)

Présentation des différents outils de la biotechnologie (Omics et bioprocédés) pour mieux comprendre le fonctionnement des biopesticides microbiens afin d'améliorer leur efficacité lors de leurs ... [more ▼]

Présentation des différents outils de la biotechnologie (Omics et bioprocédés) pour mieux comprendre le fonctionnement des biopesticides microbiens afin d'améliorer leur efficacité lors de leurs applications sur les cultures. [less ▲]

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See detailPlaidoyer pour une recherche-compagne
Havelange, Carl ULg

Conference (2014, December 10)

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See detailClarice Lispector et le concept d'écriture féminine
Petteni, Oriane ULg

Scientific conference (2014, December 10)

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See detailLa communauté du ressentiment. Analyse d'une posture énonciative
Servais, Christine ULg

Conference (2014, December 10)

Cette communication propose de caractériser la posture énonciative des « nouveaux réactionnaires » en analysant la manière dont ils s’adressent à leurs destinataires en tant que communauté politique. Par ... [more ▼]

Cette communication propose de caractériser la posture énonciative des « nouveaux réactionnaires » en analysant la manière dont ils s’adressent à leurs destinataires en tant que communauté politique. Par conséquent, on n’y conduit pas une simple analyse des représentations, mais une analyse des postures énonciatives en termes d’adresse au récepteur, étant entendu que, en convoquant une référence, le discours convoque également le destinataire dans un monde, auquel et duquel celui-ci est appelé à répondre. C’est à caractériser cet « appel » au récepteur dans le discours des « nouveaux réactionnaires » que cette intervention est consacrée. [less ▲]

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See detailLa puissance divine en images. Les figures « panthées »
Veymiers, Richard ULg

Scientific conference (2014, December 10)

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See detailDevelopment and validation of a 3D kinematic-based method for determining gait events during overground walking
Boutaayamou, Mohamed ULg; Schwartz, Cédric ULg; Denoël, Vincent ULg et al

in IEEE International Conference on 3D Imaging (IC3D) (2014, December 09)

A new signal processing algorithm is developed for quantifying heel strike (HS) and toe-off (TO) event times solely from measured heel and toe coordinates during overground walking. It is based on a rough ... [more ▼]

A new signal processing algorithm is developed for quantifying heel strike (HS) and toe-off (TO) event times solely from measured heel and toe coordinates during overground walking. It is based on a rough estimation of relevant local 3D position signals. An original piecewise linear fitting method is applied to these local signals to accurately identify HS and TO times without the need of using arbitrary experimental coefficients. We validated the proposed method with nine healthy subjects and a total of 322 trials. The extracted temporal gait events were compared to reference data obtained from a force plate. HS and TO times were identified with a temporal accuracy ± precision of 0.3 ms ± 7.1 ms, and –2.8 ms ± 7.2 ms in comparison with reference data defined with a force threshold of 10 N. This algorithm improves the accuracy of the HS and TO detection. Furthermore, it can be used to perform stride-by-stride analysis during overground walking with only recorded heel and toe coordinates. [less ▲]

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See detailAn Introduction to the Additive Manufacturing of Metallic Materials - Two Case Studies on the Processing of Stainless Steel 316L and of Ti Alloy Ti-6Al-4V
Mertens, Anne ULg

Learning material (2014)

This powerpoint presentation was used as teaching material in a seminar given as part of the course “Ingénierie des matériaux métalliques” at Université de Liège. It outlines important current issues in ... [more ▼]

This powerpoint presentation was used as teaching material in a seminar given as part of the course “Ingénierie des matériaux métalliques” at Université de Liège. It outlines important current issues in the developments of additive technologies for the processing of metallic materials by discussing two case studies from researches carried out by the Metallic Materials Science Unit (ULg). In particular, two different metallic alloys, i.e. stainless steel 316L and Ti-6Al-4V, have been processed by laser beam melting under similar conditions, and their microstructures and mechanical behaviours have been compared in details. Under the investigated conditions, Ti-6Al-4V exhibits a more complex behaviour than stainless steel 316L with respect to the occurrence of microstructural and mechanical anisotropy. Moreover, Ti-6Al-4V appears more sensitive to the build-up of internal stresses when compared with stainless steel 316L, whereas stainless steel 316L appears more prone to the formation of “lack of melting” defects. This correlates nicely with the difference in thermal conductivity between the two materials. Thermal conductivity was also shown to increase strongly with increasing temperature. [less ▲]

Detailed reference viewed: 54 (3 ULg)