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See detailIntroduction au séminaire
Francois, Jeromine ULg; Regibeau, Julien ULg

Conference (2016, March 09)

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See detailAdaptive versus linear testing: selected examples from psychology, education and medicine
Magis, David ULg

Scientific conference (2016, March 08)

Most often data from psychological, educational or medical research are collected by administering questionnaires to the participants. Such questionnaires are usually made of the same set of items (i.e ... [more ▼]

Most often data from psychological, educational or medical research are collected by administering questionnaires to the participants. Such questionnaires are usually made of the same set of items (i.e. questions) and are designed to precisely target the studied latent trait: this is referred to as "linear testing". However, linear testing can be counterproductive in some specific situations. For instance, not all items can accurately target the latent trait (e.g., "easy" items are not informative for "highly able" participants), so that the duration of the test can be uselessly extended. Adaptive testing is an emerging paradigm that aims at selecting and administering each item on the basis of previously selected items and the responses of the participants. The selectuion of the item is made optimally so that the most informative item for the respondent is chosen. This permits, among others, to better target the true latent trait to be estimated, shortening then the test duration. In this talk, linear and adaptive testing will be sketched from an educational testing approach. Then, selected examples from the psychological, educational and medical litterature will be briefly reviewed to illustrate the potentially usefulness of adaptive testing. Pros and cons of this method will also be outlined. [less ▲]

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See detailExtinction of fish-shaped marine reptiles associated with reduced evolutionary rates and global environmental volatility
Fischer, Valentin ULg; Bardet, Nathalie; Benson, Roger et al

in Nature Communications (2016), 7(10825), 1-11

Despite their profound adaptations to the aquatic realm and their apparent success throughout the Triassic and the Jurassic, ichthyosaurs became extinct roughly 30 million years before the end-Cretaceous ... [more ▼]

Despite their profound adaptations to the aquatic realm and their apparent success throughout the Triassic and the Jurassic, ichthyosaurs became extinct roughly 30 million years before the end-Cretaceous mass extinction. Current hypotheses for this early demise involve relatively minor biotic events, but are at odds with recent understanding of the ichthyosaur fossil record. Here, we show that ichthyosaurs maintained high but diminishing richness and disparity throughout the Early Cretaceous. The last ichthyosaurs are characterized by reduced rates of origination and phenotypic evolution and their elevated extinction rates correlate with increased environmental volatility. In addition, we find that ichthyosaurs suffered from a profound Early Cenomanian extinction that reduced their ecological diversity, likely contributing to their final extinction at the end of the Cenomanian. Our results support a growing body of evidence revealing that global environmental change resulted in a major, temporally staggered turnover event that profoundly reorganized marine ecosytems during the Cenomanian. [less ▲]

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See detailUtilisation dans QGIS des Web Map Services (WMS) du Géoportail de Wallonie
Lejeune, Philippe ULg; Handerek, Daphné

Cartographic material (2016)

Note technique expliquant comment accéder aux Webservices du géoportail de Wallonie avec le logiciel QGIS. Ce guide est accompagné d'un projet QGIS rassemblant les WMS les plus utiles (ortho-images ... [more ▼]

Note technique expliquant comment accéder aux Webservices du géoportail de Wallonie avec le logiciel QGIS. Ce guide est accompagné d'un projet QGIS rassemblant les WMS les plus utiles (ortho-images, cadastre, fond topographique, plans de secteurs) [less ▲]

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See detailDes styles historiques à l'Art nouveau
Charlier, Sébastien ULg

Conference given outside the academic context (2016)

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See detailUnfolding Time with Gail Jones: an Interview
Belleflamme, Valérie-Anne ULg

Diverse speeche and writing (2016)

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See detailSpecialization SIAMU : past, present and future
Servotte, Jean-Christophe ULg

Conference (2016, March 08)

Présentation de l'histoire de la spécialisation SIAMU avec un focus sur la simulation.

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See detailAOP/IGP : Gage d'origine et de spécificités ?
Tielemans, Magali ULg; Sindic, Marianne ULg

Conference given outside the academic context (2016)

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See detailMOOCs in business administration - An overview of assessment practice
Gherib, Camelia; Dujardin, Jean-Marie ULg; Verpoorten, Dominique ULg

in Proceedings of the Conference of the European Association for Practitioner Research on Improving Learning (EAPRIL) 2015, Issue 2 (2016, March 07)

The study explores 31 MOOCs in the field of business administration, equipped with a conceptual framework documenting 18 facets of assessment design. As a second step, the data collected on 3 MOOCs about ... [more ▼]

The study explores 31 MOOCs in the field of business administration, equipped with a conceptual framework documenting 18 facets of assessment design. As a second step, the data collected on 3 MOOCs about assessment is submitted to university members in charge of external courses accreditation procedures in order to ascertain its possible influence on their decision to credit a MOOC or not. Main results indicate that, a) the typical profile of the assessment procedure for MOOCs in business administration is: QCM-based, automatic, continuous, individual, product-centred, standardized, b) secure ways (proctoring, test-centres) to warrant learners’ identity for the tests can already be found in some MOOCs of this field, and c) concerns of course accreditors bear first and foremost on these student authentication aspects. [less ▲]

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See detailLa 3D : la technologie qui a changé l'histoire du monde
Verly, Jacques ULg

Conference given outside the academic context (2016)

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See detailPerformance variation of common ragweed (Ambrosia artemisiifolia L.) across invasion levels in Western Europe
Ortmans, William ULg; Mahy, Grégory ULg; Chauvel, Bruno et al

in Flora (2016), 220

The occurrence of an invasive plant across a continent is generally not homogeneous; typically, some areas are highly invaded whereas others show moderate or low invasion levels. This situation might be a ... [more ▼]

The occurrence of an invasive plant across a continent is generally not homogeneous; typically, some areas are highly invaded whereas others show moderate or low invasion levels. This situation might be a snapshot of an ongoing spread, but it could also remain stable under the pressure of factors that constrain the invasion. Among those factors, plant performance variation among invasion levels can explain an invasion slowdown. However, few studies have investigated the large-scale variation of invasive plant performance in the field. Ambrosia artemisiifolia L. in Western Europe represents a good opportunity to address this issue, with areas of high, moderate and low invasion levels being documented across a ca. 1000 km transect. In this study, we compared in situ plant performance-related traits in 12 populations from areas of contrasting invasion levels. We also tested whether performance-related traits were influenced by the intra-and inter-specific competition, by the local climatic conditions or by latitude (a proxy for growing season length). Overall, we did not find differences in performance-related traits across invasion levels, and intra-and inter-specific competition had low effects on plant performance. This study highlights the fact that A. artemisiifolia individuals express similar performance across invasion levels, even beyond what can be considered the present invasion front. Further research has to expand this study northwards, and assess other factors that could constrain the invasion in order to highlight if the species invasion northward is constrained or if it has the potential to invade new areas. [less ▲]

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See detailThe Many AUrorae of Jupiter : Auroral Ffilaments, Flares, Transient features of the main oval, Swirls, Polar dawn spots, Injection signatures and Satellite footprints
Bonfond, Bertrand ULg

Conference (2016, March 07)

The presentation is a review of the many features of the Jovian aurorae in the frame of the imminent arrival of the Juno spacecraft around Jupiter, with a special focus on the most recent results.

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See detail"Macbeth", de Shakespeare à Orson Welles
Tomasovic, Dick ULg

Conference given outside the academic context (2016)

Analyse de l'adaptation cinématographique du Macbeth de Shakespeare par Orson Welles en 1948.

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See detailUNESCO et politique internationale de la culture : historique de la diversité culturelle
Vlassis, Antonios ULg

Scientific conference (2016, March 07)

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See detailDynamic calibration of piezoelectric transducers for ballistic high-pressure measurement
Elkarous, Lamine ULg; Robbe, Cyril; Pirlot, Marc et al

in International Journal of Metrology and Quality Engineering (2016)

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See detailPerformance of a radial-inflow turbine integrated in an ORC system and designed for a WHR on truck application: An experimental comparison between R245fa and R1233zd
Guillaume, Ludovic ULg; Legros, Arnaud ULg; Desideri, Adriano ULg et al

in Applied Energy (2016)

The goal of this study is to experimentally compare the performance of an Organic Rankine Cycle (ORC) system equipped with a radial-inflow turbine for two working fluids: R245fa and R1233zd. The radial ... [more ▼]

The goal of this study is to experimentally compare the performance of an Organic Rankine Cycle (ORC) system equipped with a radial-inflow turbine for two working fluids: R245fa and R1233zd. The radial- inflow turbine is a small-scale prototype designed to convert the waste heat from the exhaust gases of a truck combustion engine and was developed mainly using components of truck turbochargers. It is directly connected to a high-speed synchronous generator. The bearings system of the turbine and the generator have the innovative particularity to be respectively lubricated and cooled down by the working fluid so no additional lubricant or coolant is needed. The experimental comparison is carried out over a test-rig equipped with the radial turbine. The heat wasted by the truck through the exhaust gases is sim- ulated using an electric oil boiler coupled to the ORC loop. The electrical power supplied by the turbine, limited to a maximum of 3.5 kWel by the generator, is then dissipated in a load bank composed of truck fans while the condenser is cooled by a water loop. Measurements in steady-state are performed in order to evaluate the performance of the turbine-generator set when varying the pressure ratio, the rotational speed, the inlet temperature and the mass flow rate of the turbine and the lubrication flow rate of the bearings for various oil temperatures and mass flow rates. In order to identify the most suitable fluid for the Waste Heat Recovery (WHR) application, three comparison methods are proposed and discussed based on the measurements. Finally, because the turbine-generator set is the first oil-free prototype developed by the manufacturer, potential sources of improvements are discovered and discussed. [less ▲]

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See detailLe casier judiciaire : un instrument mémoriel au passé tourmenté mais à l’avenir empreint de sérénité ?
Seron, Vincent ULg

in Journal des Tribunaux (2016)

Profondément réformé en 1997, le casier judiciaire n’en finit pas de faire l’objet de remaniements et de prêter le flanc à la critique. Des modifications régulièrement opérées s’agissant de la délivrance ... [more ▼]

Profondément réformé en 1997, le casier judiciaire n’en finit pas de faire l’objet de remaniements et de prêter le flanc à la critique. Des modifications régulièrement opérées s’agissant de la délivrance de ses extraits à sa mise à jour lacunaire, nombreux sont les éléments qui témoignent des difficultés récurrentes auxquelles cet instrument séculaire est confronté. En quatre temps, cet article propose de remettre en perspective les principaux éléments explicatifs de l’état transitoire au sein duquel le casier judiciaire est confiné depuis près de deux décennies, d’analyser son fonctionnement actuel, de focaliser l’attention sur les récents changements apportés à son contenu ainsi qu’à la communication des données qu’il contient, et de s’interroger sur la prétendue non fiabilité de ce casier. [less ▲]

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See detailPropositions pour penser la notion d'erreur en photographie
Havelange, Carl ULg

Conference (2016, March 04)

Detailed reference viewed: 16 (0 ULg)