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See detailArchaeometry at the Centre Européen d'Archéométrie
Calvo Del Castillo, Helena ULg

Conference (2008)

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See detailRisk-aware decision making and dynamic programming
Defourny, Boris ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

Conference (2008)

This paper considers sequential decision making problems under uncertainty, the tradeoff between the expected return and the risk of high loss, and methods that use dynamic programming to find optimal ... [more ▼]

This paper considers sequential decision making problems under uncertainty, the tradeoff between the expected return and the risk of high loss, and methods that use dynamic programming to find optimal policies. It is argued that using Bellman's Principle determines how risk considerations on the return can be incorporated. The discussion centers around returns generated by Markov Decision Processes and conclusions concern a large class of methods in Reinforcement Learning. [less ▲]

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See detailLes marqueurs de l'alcoolisme
Charlier, Corinne ULg

Conference (2008)

Detailed reference viewed: 17 (1 ULg)
See detailImagerie fonctionnelle et coma: implications pronostiques
Vanhaudenhuyse, Audrey ULg

Conference (2008)

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See detailMultidisciplinary approach to study of design cognitive process: the case of human errors in architectural preliminary design
Safin, Stéphane ULg; Leclercq, Pierre ULg; Blavier, Adelaïde ULg

Conference (2008)

This contribution aims to show a multidisciplinary method to understand and formalize design process, from a cognitive point of view, in the particular case of human errors in architectural preliminary ... [more ▼]

This contribution aims to show a multidisciplinary method to understand and formalize design process, from a cognitive point of view, in the particular case of human errors in architectural preliminary design process. We first emphasize the importance of error detection and recovery in the sketching phase in architecture. After the description of our methodology, we explain the general theory and model on human error, the short study we made and our proposition of a model on hu- man error in architectural design. We finally conclude by giving some first re- quirements from this model in order to improve to the development of sketch- based CAD tools. [less ▲]

Detailed reference viewed: 47 (2 ULg)
Peer Reviewed
See detailOn the complementarity of contrastive linguistics and interlanguage studies
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2008)

Detailed reference viewed: 20 (1 ULg)
Peer Reviewed
See detailEnglish and Spanish Size Noun-constructions, a locus of ongoing grammaticalization
Brems, Lieselotte ULg; Verveckken, Katrien

Conference (2008)

Detailed reference viewed: 6 (1 ULg)
See detailAperture imaging beyond the classical resolution limit by using incoherent photons
Thiel, C.; Bastin, Thierry ULg; von Zanthier et al

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailThe grammaticalization of English and French type nouns
Brems, Lieselotte ULg; Willemse, Peter; Davidse, Kristin

Conference (2008)

Detailed reference viewed: 4 (1 ULg)
Peer Reviewed
See detailAssessment of stress level in horses (Equus caballus): behavioural and physiological measurements in hospital.
Peeters, Marie ULg; Péters, F.; Sulon, J. et al

Conference (2008)

Detailed reference viewed: 41 (7 ULg)
Peer Reviewed
See detailLe champ d'application de la loi Breyne
Kohl, Benoît ULg

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
See detailCoupling of N Qubits to Any Dicke State via Projective Measurements
Thiel, C.; Maser, A.; Bastin, Thierry ULg et al

Conference (2008)

Detailed reference viewed: 8 (0 ULg)
See detail(Inter)subjectification in the Middle English Passive construction
Petré, Peter ULg

Conference (2008)

Detailed reference viewed: 7 (0 ULg)
See detailQuantum imaging with uncorrelated single photon sources
Bastin, Thierry ULg; Thiel, C.; Solano, E. et al

Conference (2008)

Detailed reference viewed: 4 (1 ULg)
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Peer Reviewed
See detailMarine and fresh water palynomorphs from the Jauf Formation, Northwest Saudi Arabia
Miller, A.; Breuer, P.; Al-Ghazi, A. et al

Conference (2008)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailArchaeometry at the Centre Européen d’Archéométrie-Université de Liège
Calvo Del Castillo, Helena ULg; Mathis, François ULg; Garcia Moreno, Renata et al

Conference (2008)

Detailed reference viewed: 34 (3 ULg)
See detailA Nested Model of the West Florida Shelf: Assimilation of High-Frequency Radar Currents and study of Loop Current generated flow
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Zheng, L. et al

Conference (2008)

High-Frequency Radar Currents are assimilated in a West Florida Shelf (WFS) model based on the Regional Ocean Model System (ROMS) which is nested in the Atlantic Hybrid Coordinate Ocean Model (HYCOM) to ... [more ▼]

High-Frequency Radar Currents are assimilated in a West Florida Shelf (WFS) model based on the Regional Ocean Model System (ROMS) which is nested in the Atlantic Hybrid Coordinate Ocean Model (HYCOM) to include both local and deep-ocean forcing, particularly the Gulf of Mexico Loop Current (LC). An ensemble simulation of the WFS ROMS model is carried out under different wind forcings in order to estimate the error covariance of the model state vector and the covariance between ocean currents and winds. Radial currents measured by HF-Radar antennas near St. Petersburg and Venice, FL, are assimilated using this ensemble-based error covariance. Different assimilation techniques using a time-average ensemble, a filter to reduce surface-gravity waves and an extended state vector including wind stress were tested. Results of WFS ROMS model assimilating surface currents show an improvement of the model currents not only at the surface but also at depth. The LC is a highly unstable current which generates large anticyclones traveling to the West but also a series of smaller anticyclones and filaments moving to the East and affecting the West Florida shelf. An additional tracer is included in the model simulation to track the presence of LC water. With this tracer, the total amount of LC water reaching the shelf and its mechanism is studied. [less ▲]

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Peer Reviewed
See detailHealthy and safe food for everybody
Jijakli, Haissam ULg

Conference (2008)

Detailed reference viewed: 3 (1 ULg)
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See detailConformal doping of FINFET's : a fabrication and metrology challenge
Vandervorst, Wilfried; Eyben, Pierre; Mody, Jay et al

Conference (2008)

Detailed reference viewed: 45 (0 ULg)
Peer Reviewed
See detailArchaeometry At The Tomb Of Menna, Theban Necropolis, Egypt: A Multi-Method Analytical Approach
Garcia Moreno, Renata; Mathis, François ULg; Van Elslande, Elsa et al

Conference (2008)

Detailed reference viewed: 26 (0 ULg)
Peer Reviewed
See detailHistoires parallèles de la sculpture moderne
Bawin, Julie ULg

Conference (2008)

Detailed reference viewed: 2 (0 ULg)
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See detailPseudomonas aeruginosa and severity of ventilator associated pneumonia
BROUSSE, Murielle; LAYIOS, Nathalie ULg; LEDOUX, Didier ULg et al

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
See detailTotal Electron Content monitoring using triple frequency GNSS data: a three-step approach
Spits, Sandrine; Warnant, René ULg

Conference (2008)

Detailed reference viewed: 16 (2 ULg)
See detailQuantum imaging with single photon sources
Thiel, C.; Bastin, Thierry ULg; von Zanthier, J. et al

Conference (2008)

Detailed reference viewed: 2 (0 ULg)
See detailIonospheric Products and Services from the Regional Warning Centers of the International Space Environment Service (ISES) for GNSS Users
Kunches, J.; Terkildsen, M.; Stanislawska, I. et al

Conference (2008)

Detailed reference viewed: 14 (0 ULg)
See detailLe droit scolaire
Maréchal, Benoît ULg

Conference (2008)

Seminar on the rights and duties at school and the admninistrative proceedings in case of litigation.

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See detailDes appétits nouveaux pour les produits de terroir ?
Duquesne, Brigitte ULg

Conference (2008)

Detailed reference viewed: 34 (8 ULg)
Peer Reviewed
See detailProbable microfossils in 3.2 Ga-old shallow-water siliciclastic deposits
Javaux, Emmanuelle ULg; Marshall, Craig; Bekker, Andrey

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
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See detailPrix de l’alimentation : une hausse sans faim
Duquesne, Brigitte ULg

Conference (2008)

Detailed reference viewed: 25 (5 ULg)
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See detailSpécificités et contraintes de la mesure des odeurs dans l'environnement par réseaux de capteurs
Nicolas, Jacques ULg

Conference (2008)

L'estimation de la nuisance olfactive dans l'environnement est une tâche rendue particulièrement difficile par la multiplicité des sources, leur grande variabilité, leur caractère parfois très diffus et ... [more ▼]

L'estimation de la nuisance olfactive dans l'environnement est une tâche rendue particulièrement difficile par la multiplicité des sources, leur grande variabilité, leur caractère parfois très diffus et fugitif et surtout par la subjectivité de l'appréciation de la gêne. Aussi faut-il mettre en œuvre plusieurs méthodes complémentaires qui vont de l'analyse chimique (GCMS) aux enquêtes de riverains, en passant par l'olfactométrie dynamique impliquant un panel de personnes reniflant différentes dilutions d'un échantillon prélevé sur le terrain. Or, aucune de ces méthodes ne permet un suivi continu des odeurs qui viserait, par exemple, à détecter l'émergence d'une émission particulière dans une ambiance. A ce niveau, la technologie des nez électroniques semble très prometteuse et particulièrement attractive. Basée sur la réponse globale d'un réseau de capteurs non spécifiques, elle permet non seulement d'identifier qualitativement une source particulière, mais également de la suivre en continu. L'unité "Surveillance de l'Environnement" de l'ULg applique cette technique pour suivre les odeurs en périphérie de sites émetteurs et notamment un centre de compostage. Les appareils développés sont basés sur des capteurs commerciaux à oxydes métalliques. La méthode exige une calibration préalable afin de créer et de valider le modèle de reconnaissance et la loi qui relie les signaux des capteurs à une variable quantitative comme la concentration d'odeur. Bien que testée avec succès autour d'installations en vraie grandeur, la technique des "nez électroniques" reste soumise à de nombreuses limitations et contraintes. Parmi ces contraintes, il faut citer la dérive des capteurs, l'influence de l'humidité et de la température, la difficulté de trouver un gaz étalon représentatif des odeurs environnementales ou encore celle de calculer un indicateur global qui serait l'image "électronique" de la nuisance olfactive. En général, la méthode du nez électronique peut être envisagée pour le suivi d'odeurs ponctuelles à la source, par exemple dans un hall de compostage ou dans un bâtiment d'élevage, pour autant que l'ambiance ne soit pas trop agressive. L'unité de recherche teste actuellement le principe de réseaux de nez électroniques placés tout autour d'un site. En ajoutant l'information en provenance d'une station météorologique, un tel système permet la prédiction en temps réel de zones de nuisance olfactive dans l'environnement. Cependant, dès que l'on s'éloigne de l'émission et que l'on s'intéresse à la mesure de l'ambiance olfactive à proximité des habitations des riverains, la technique des nez électroniques présente une limitation sévère due au seuil de détection des capteurs. En effet, le nez humain est parfois sensible à de très faibles concentrations de composés volatils qui ne sont pas détectées par les capteurs. Il devient alors indispensable de piéger ces composés dans des dispositifs de pré-concentration en ligne. De tels dispositifs, actuellement en développement, autoriseraient un élargissement du champ d'application des nez électroniques, notamment vers le domaine très vaste de l'environnement intérieur. [less ▲]

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See detailATOMIC STRUCTURES OF HEAVY ELEMENTS : RECENT PROGRESS AND PERSPECTIVES
Biémont, Emile ULg; Fivet, V.; Palmeri, P. et al

Conference (2008)

In the present paper, we discuss some recent advances concerning the determination of new radiative parameters (transition probabilities, oscillator strengths, radiative lifetimes, branching fractions ... [more ▼]

In the present paper, we discuss some recent advances concerning the determination of new radiative parameters (transition probabilities, oscillator strengths, radiative lifetimes, branching fractions, Landé factors) in heavy ions. We also emphasize the difficulties that are frequently met in the field and that sometimes prevent obtaining accurate atomic data for the transitions of astrophysical interest. We concentrate particularly on the determination of radiative parameters for selected rare-earth (RE) ions (lanthanides and actinides) and for some atoms and ions of the sixth row of the periodic table. [less ▲]

Detailed reference viewed: 12 (2 ULg)
See detailWave-particle duality in a two atom interferometer
Schilling, U.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2008)

Detailed reference viewed: 3 (1 ULg)
Peer Reviewed
See detailChanges in plankton dynamics and biodiversity in the oligotrophic Bay of Calvi (Corsica, Northwestern Mediterranean): response to climate change
Goffart, Anne ULg; Hecq, Jean-Henri ULg

Conference (2008)

The development of the winter-spring phytoplankton bloom is investigated in the Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. A drastic reduction of phytoplankton biomass is ... [more ▼]

The development of the winter-spring phytoplankton bloom is investigated in the Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. A drastic reduction of phytoplankton biomass is evidenced over the last three decades. Changes in phytoplankton dynamics and biodiversity are discussed in relation to long-term changes in wind stress, NAO conditions and environmental conditions. As a consequence, time-series results enlighten that the entire food web dynamics is affected and that ecosystem resilience is threatened. [less ▲]

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See detailDéveloppement rural et coopération interuniversitaire
Dang Vu, Binh; Vu Dinh, Ton; Lebailly, Philippe ULg et al

Conference (2008)

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See detailExtraction, caractérisation et activités antimicrobiennes de quelques huiles essentielles des plantes du haut et moyen atlas du Maroc
Dahak, K.; Lakhmili, S.; Wathelet, Jean-Paul ULg et al

Conference (2008)

Notre étude a porté sur l'extraction des huiles essentielles (HE) de certaines plantes Marocaines du haut Atlas: région de Marrakech (Citrus aurantium, Lavandula dentata et Feoniculum vulgare) et du moyen ... [more ▼]

Notre étude a porté sur l'extraction des huiles essentielles (HE) de certaines plantes Marocaines du haut Atlas: région de Marrakech (Citrus aurantium, Lavandula dentata et Feoniculum vulgare) et du moyen Atlas: région d’azilal (Ouaouizerth) (Laurus nobilis et Lavandula officinalis). [less ▲]

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See detailEvolution of the clinical expression of Bluetongue in Belgian cattle during year 2006 vs 2007
Guyot, Hugues ULg; Mauroy, Axel ULg; Rollin, Frédéric ULg et al

Conference (2008)

In August 2006, Belgium notified its first cases of Bluetongue (BT), serotype 8, in cattle and sheep. The disease was also observed at this time in the neighboring countries. The resurgence of BT was ... [more ▼]

In August 2006, Belgium notified its first cases of Bluetongue (BT), serotype 8, in cattle and sheep. The disease was also observed at this time in the neighboring countries. The resurgence of BT was observed in Northern Europe in 2007. The aim of the study was to compare clinical signs of BT observed in 2006 vs 2007 in Belgian cattle. The description of clinical signs was based on the observation of 38 and 39 cows in 2006 and 2007, respectively. BT cases were only included if they were confirmed by one or both laboratory diagnostic tests (competitive ELISA test and/or RT-qPCR). The inventory of clinical signs was made with a standardised clinical form for BT. This form is divided into general, cutaneous, locomotor, digestive, respiratory, neurological and reproductive clinical signs. Case data were summarised to determine changes in clinical presentation of BT between 2006 and 2007. A Fischer’s exact probability test was performed to compare (P<0.05) the frequency of clinical signs between the two years. Regarding general clinical signs, hyperthermia and tiredness were more often observed in 2007, compared to 2006. All clinical signs about skin and annexes were not significantly different between the two years. Locomotor signs such as prostration, incapacity to get up, reluctance to move, lameness and amyotrophy were more frequent in 2007. Loss of appetite, difficulties in grasping feed, salivation and drooling were the digestive signs more often observed in 2007. A purulent nasal discharge was the only respiratory sign more commonly observed in 2007. Apathy, generalised weakness and paresis or paralysis were more often encountered in 2007. The most important changes between the two years concerned reproduction. A higher incidence of abortion, premature calving and stillbirth was observed during 2007 outbreak. The frequency of most of the clinical signs of BT was higher in 2007 in Belgian cattle. Confirmed cases of BT in Belgian cattle were only 296 in 2006 compared to 4187 in 2007. These data do not represent the real situation of BT infection because the farmers do not notify all cases. Nevertheless, it seems that the 2007 outbreak was more severe regarding the number of cases and the frequency of clinical signs. The mild winter and wet 2007 summer might have favored the persistence of the vectors. [less ▲]

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See detailLong-term fluctuations (1979 – 2008) of the phytoplankton dynamics in the Bay of Calvi (Corsica, NW Mediterranean): relations with wind stress variability and NAO index
Goffart, Anne ULg; Hecq, Jean-Henri ULg

Conference (2008)

The development of the winter-spring phytoplankton bloom is investigated in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. Time-series results enlighten that ... [more ▼]

The development of the winter-spring phytoplankton bloom is investigated in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. Time-series results enlighten that changes in environmental conditions in the Corsican sector have altered the coastal phytoplankton dynamics and induced a drastic reduction of the winter-spring phytoplankton biomass over the last three decades. At the local scale, variations in winter wind stress control the development of the winter-spring phytoplankton bloom and the structure of the phytoplankton assemblages. Results emphasize that the total phytoplankton biomass (chl a) is higher during high winter wind stress years. From a specific point of view, flagellates are always the dominant component of the phytoplankton bloom communities. However, diatoms tend to be more abundant during high winter wind stress years. At a wider scale, a link between the intensity of the phytoplankton bloom and the winter NAO index is established. Lastly, the decrease in phytoplankton abundance coincides with changes in zooplankton populations. As a consequence, the entire pelagic food web dynamics is affected by climate variations and the ecosystem resilience is threatened. [less ▲]

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See detailDe l'esquisse à la maquette digitale : transformation des représentations graphiques en modèles numériques pour l'ingénierie de conception.
Elsen, Catherine ULg; Leclercq, Pierre ULg

Conference (2008)

Ce projet s’intéresse à la place que tient aujourd’hui l’esquisse et les représentations 3D au sein du processus de conception, et plus particulièrement au sein des phases amont de la création chez les ... [more ▼]

Ce projet s’intéresse à la place que tient aujourd’hui l’esquisse et les représentations 3D au sein du processus de conception, et plus particulièrement au sein des phases amont de la création chez les designers de produit. La question posée est la pertinence de l’esquisse au sein du système global des représentations externes et sa place actuelle dans le monde des possibles offerts par la CAO. La finalité de la recherche est l’objectivation d’un concept IHM pouvant effectivement et efficacement supporter les designers en phase créative. [less ▲]

Detailed reference viewed: 115 (29 ULg)
See detailJacques Derrida et l'analyse spectrale de l'oeuvre d'art
Steinmetz, Rudy ULg

Conference (2008)

Detailed reference viewed: 22 (3 ULg)
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See detailVers quelle alimentation « soutenable » ?
Duquesne, Brigitte ULg

Conference (2008)

Detailed reference viewed: 28 (4 ULg)
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Peer Reviewed
See detailVapor phase doping: an atomic layer deposition approach to n-type doping in classical chemical vapor deposition epitaxy
Takeuchi, Shotaro; Nguyen, Ngoc Duy ULg; Leys, Frederik et al

Conference (2008)

Detailed reference viewed: 14 (1 ULg)
Peer Reviewed
See detailWelcome & Introduction to Liège Image Days 2008: Medical Imaging
Verly, Jacques ULg

Conference (2008)

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailIn Anticipation of the Loop : Stein’s Four Saints
Delville, Michel ULg

Conference (2007, December 21)

Detailed reference viewed: 20 (0 ULg)
Peer Reviewed
See detailLes applications de la logique modale dans l’étude des modalités linguistiques
Polis, Stéphane ULg

Conference (2007, December 20)

Detailed reference viewed: 9 (0 ULg)
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See detailUsing survey data to resolve the exchange risk exposure puzzle
Muller, Aline ULg; Jongen, Ron; Verschoor, Willem

Conference (2007, December 20)

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See detailAnalyse pluviométrique au Niger : récentes modifications et impacts environnementaux. Focus sur la région de Gouré, Niger oriental.
Ozer, Pierre ULg

Conference (2007, December 13)

Depuis la fin des années 1960, la région sahélienne est touchée par une terrible sécheresse. Cet article analyse les variations climatiques enregistrées dans la région de Gouré, Niger oriental, entre 1936 ... [more ▼]

Depuis la fin des années 1960, la région sahélienne est touchée par une terrible sécheresse. Cet article analyse les variations climatiques enregistrées dans la région de Gouré, Niger oriental, entre 1936 et 2003. Il apparaît que la zone étudiée est sortie de la « Grande Sécheresse » à la fin des années 1980. Cependant, les conséquences de ce retour à des conditions plus humides ne se seraient pas accompagné d’une amélioration significative de la longueur de la saison des pluies. [less ▲]

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See detailLes glomérulonéphrites
Krzesinski, Jean-Marie ULg

Conference (2007, December 11)

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See detailDecontamination of Resistant Emerging Pathogens
Melin, Pierrette ULg

Conference (2007, December 11)

Detailed reference viewed: 2 (0 ULg)
See detailThe role of Constitutional Courts as positive framework-legislators
Behrendt, Christian ULg

Conference (2007, December 11)

Conference in comparative constitutional law given in 2007 at the Law Faculty of the Erasmus University of Rotterdam (Erasmus Law School), and exposing the results of my PhD research, published in 2006 ... [more ▼]

Conference in comparative constitutional law given in 2007 at the Law Faculty of the Erasmus University of Rotterdam (Erasmus Law School), and exposing the results of my PhD research, published in 2006, on the role of Constitutional Courts as framework-legislators. [less ▲]

Detailed reference viewed: 56 (0 ULg)
See detailNumerical and experimental characterization of flow in a radial flow cell with aspect ration one.
Detry, Jean; Jensen, B.; Koitzsch, R. et al

Conference (2007, December 10)

Detailed reference viewed: 6 (3 ULg)
See detailSalt, hypertension and the kidneys
Krzesinski, Jean-Marie ULg

Conference (2007, December 07)

Detailed reference viewed: 4 (0 ULg)
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See detailConciliation qualité de vie au travail et qualité de vie en général
Etienne, Anne-Marie ULg

Conference (2007, December 07)

Detailed reference viewed: 14 (0 ULg)
See detailRisque cardiovasculaires chez les jeunes étudiants
Krzesinski, Jean-Marie ULg

Conference (2007, December 07)

Detailed reference viewed: 3 (1 ULg)
See detailLes apories du matérialisme dialectique
Seba, Jean-Renaud ULg

Conference (2007, December 07)

Detailed reference viewed: 31 (2 ULg)
See detailMeasured Correlations of Auroral Emissions from Jupiter and Saturn With Solar Wind Variations
Clarke, J. T.; Nichols, J.; Gérard, Jean-Claude ULg et al

Conference (2007, December 01)

An extended set of Hubble Space Telescope (HST) observations of the UV auroral emissions from Jupiter and Saturn has been carried out in three campaigns over Jan.-June 2007. This is by far the most ... [more ▼]

An extended set of Hubble Space Telescope (HST) observations of the UV auroral emissions from Jupiter and Saturn has been carried out in three campaigns over Jan.-June 2007. This is by far the most extensive series of remote high resolution imaging of planetary aurora to date, and provides new physical insight into the cause and effect relationships governing the controlling processes for the giant planet auroral emissions. Simultaneous in situ measurements of local solar wind and magnetospheric plasma conditions have been made during two of these campaigns by Cassini at Saturn in Jan. 2007 and by the New Horizons mission approaching Jupiter in Feb. 2007. The UV auroral emission brightness and distributions have also been compared with estimates of the solar wind conditions near each planet extrapolated from near-Earth measurements, which can be verified by comparison with Cassini and New Horizons in situ data. It has been found that there is a good correlation at both planets between total auroral power and solar wind dynamic pressure, at least for the major solar wind disturbances arriving at each planet. At the same time, the nature of the auroral brightenings differs between Jupiter and Saturn, and the source regions of auroral activity are quite different in the two magnetospheres. In this presentation, the HST and solar wind data and the nature of the correlations will be presented. The physical significance of the correlations will be discussed, based on the much denser set of measurements now available. [less ▲]

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See detailTitan Airglow Spectra from Cassini UVIS
Ajello, J. M.; Gustin, Jacques ULg; Stevens, M. et al

Conference (2007, December 01)

We present the first UV airglow observations of Titan's atmosphere by the Ultraviolet Imaging Spectrograph (UVIS) on Cassini. The known UV emissions of Titan have been examined with higher spectral ... [more ▼]

We present the first UV airglow observations of Titan's atmosphere by the Ultraviolet Imaging Spectrograph (UVIS) on Cassini. The known UV emissions of Titan have been examined with higher spectral resolution (0.4 nm FWHM) by the Cassini UVIS than in the past by the Voyager Ultraviolet Spectrometer (UVS) (3.0 nm FWHM). The UVIS observations, confirming Voyager UVS results, have shown that molecular nitrogen is the major constituent of the upper atmosphere of Titan. Using one spectral channel in the EUV from 56--118 nm and one in the FUV from 112--191 nm, the UVIS observed the disk on 13 December, 2004. The combined EUV and FUV spectral region is a probe of the stratosphere-mesosphere-thermosphere-exosphere region from about 300--2000 km. The EUV spectrum consists of three band systems of N2 (b {1}Πu, b' {1}Σu+, c{4'} {1}Σ{u+}--X {1}Σ{g+}), while the FUV spectrum consists of one N2 (a {1}Πg--X {1}Σ{g+}). The UVIS observations reveal that the c{4'}(0)--X(0) vibrational band near 95.8 nm is suppressed, and that N \sc{i} multiplets near 95.32 and 96.45 nm are present instead. Magnetospheric particle excitation is weak on this orbit, since the nightside EUV spectrum shows no observable N2 emission features and only H Lyman-β. The absence of significant darkside emission demonstrates that nitrogen emissions are predominantly excited on this orbit by photoelectrons near 900 km in the thermosphere. Above 145 nm most of the observed signal is due to sunlight reflected by N2 in the Titan mesosphere-stratosphere and modified by aerosol and hydrocarbon absorption. Mixing ratios of C2H2, C4H2, C2H4 and tholins have been derived from the reflected sunlight emission between 145 and 190 nm, using a Rayleigh scattering model. Assuming that the energy deposition at these wavelengths occurs near 300 km, these mixing ratios are in good agreement with recent photochemical models and previous Voyager observations in the IR. We also present the first geometric albedo measurement of Titan from 150--190 nm. [less ▲]

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See detailAuroral Movies and Spectroscopy from Cassini UVIS
Pryor, W. R.; West, R.; Stewart, I. et al

Conference (2007, December 01)

Cassini's Ultraviolet Imaging Spectrograph (UVIS) has completed three years of study of Saturn's atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and ... [more ▼]

Cassini's Ultraviolet Imaging Spectrograph (UVIS) has completed three years of study of Saturn's atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and FUV data from 111.5-191.3 nm. 64 spatial pixels along each slit are combined with slit motion to construct spectral images of Saturn. Auroral emissions are seen from electron-excited molecular and atomic hydrogen. In 2007 UVIS obtained data with the spacecraft well out of Saturn's ring plane, permitting us to create images, spectra, and at times movies. We will present an auroral movie from 2007-145 that has been processed to remove flat-fielding artifacts and deconvolved to remove scattering along the slit. The movie shows near co- rotation of N polar auroral features with the planet's rotation. An auroral oval is present. The oval appears doubled on the midnight side. Other images from this year show emissions inside the auroral oval. We will discuss these images and their spectra. Additional images and movies are planned in coming months. [less ▲]

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See detailFaisabilité de la mise en place d’un outil de mesure de la charge de travail des magistrats destiné au siège : conclusions d’une recherche.
Delvaux, David ULg

Conference (2007, December)

Présentation des résultats d'une recherche mandatée par la Politique Scientifique Fédérale et le Ministère de la Justice et intitulée: "Etude de faisabilité de la mise en place d'un outil de mesure de la ... [more ▼]

Présentation des résultats d'une recherche mandatée par la Politique Scientifique Fédérale et le Ministère de la Justice et intitulée: "Etude de faisabilité de la mise en place d'un outil de mesure de la charge de travail destiné au siège". [less ▲]

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See detailLa Culture céramique de Terqa au troisième millénaire
Mas, Juliette ULg

Conference (2007, December)

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See detailApplication du protocole Ovsynch au traitement du kyste ovarien chez la vache
Hanzen, Christian ULg

Conference (2007, December)

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See detailApplication de la GnRH au traitement de l'infertilité chez la vache
Hanzen, Christian ULg

Conference (2007, December)

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Peer Reviewed
See detailLactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris)
Habran, Sarah ULg; Debier, Cathy; Lepoint, Gilles ULg et al

Conference (2007, November 30)

Northern elephant seals, Mirounga angustirostris, are exceptional mammals: females fast entirely during nursing while their pups may quadruple in weight over the 25-day suckling period. Females thus lose ... [more ▼]

Northern elephant seals, Mirounga angustirostris, are exceptional mammals: females fast entirely during nursing while their pups may quadruple in weight over the 25-day suckling period. Females thus lose approximately a third of body mass and produce energy-rich milk with a high fat content. Stable carbon and nitrogen isotope ratios (d13C and d15N used as diet markers) and total mercury concentrations (Hg) were measured in tissues (blood cells, serum, full blood, milk and blubber) from 20 mother-pup pairs on days 4 and 21 of lactation. A systematic difference was observed between isotopic values in blood cells and serum of the mothers, linked to diet and distinct biochemical composition between blood components. d13C differed between inner and outer blubber layers and were similar between inner blubber and milk. High Hg concentrations (up to 350 ng.g-1ww at the beginning of lactation) were found in the blood of mother elephant seals linked to their high d15N values in blood cells. Hg transfer through placenta and milk was observed between mothers and pups. A significant increase of blood Hg concentration in mothers (+285 ng.g-1ww) and a decrease in pups (-93 ng.g-1ww) were observed between days 4 and 21 of lactation. Both processes were explained by a remobilization of proteins and lipids during fasting and milk production in mothers and by a dilution of Hg in pups due to their high mass increase during this period. This study confirms that lactation modifies stable nitrogen isotope ratios in tissues, as well as mercury levels in blood from mothers and pups, and highlights the existence of a transplacental and transmammary transfer of mercury in northern elephant seals. Therefore, physiological processes and body condition should be considered carefully when interpreting stable isotope ratios and Hg concentrations in the framework of biomonitoring. [less ▲]

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See detailThe Definition of the Concept of Tax
Bourgeois, Marc ULg

Conference (2007, November 29)

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See detailA dynamic model of an experimental bloom of coccolithophores Emiliania huxleyi
Joassin, Pascal ULg; Borges, Alberto ULg; Chou, Lei et al

Conference (2007, November 27)

A dynamic model has been developed to represent biogeochemical events observed during an experimentally induced bloom of coccolithophores Emiliania huxleyi. This bloom occurred in a mesocosm experiment ... [more ▼]

A dynamic model has been developed to represent biogeochemical events observed during an experimentally induced bloom of coccolithophores Emiliania huxleyi. This bloom occurred in a mesocosm experiment (Bergen 2001 experiment) during which ecosystem development was followed over a 23-days period through changes of the stocks of inorganic nutrients (nitrate, ammonium and phosphate), dissolved inorganic carbon and pCO2, O2 concentration, pigments, particulate organic carbon and nitrogen, dissolved organic carbon, the production of Transparent Exopolymeric Particles (TEP), primary production, alkalinity, calcification and particulate inorganic carbon. The dynamic model is based on unbalanced algal growth and balanced growth for bacteria as described in Van den Meersche et al. (2004). In addition, in order to adequately reproduce the observations, the model has been extended by including an explicit description of calcification, T.E.P production and an enhanced mortality due to viruses. This last process, based on a critical promiscuity between cellular hosts and viral agents, successfully contributed to reproduce the bloom extinction as observed in the mesocosm experiment. This model will be implemented in a coupled physical-biogeochemical model of the Black Sea ecosystem in the framework of the EU Sesame project and in the Gulf of Biscay in the frame of the Belgian PEACE project. [less ▲]

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Peer Reviewed
See detailPrinciples of European Contract Law and Consumer Construction Law
Kohl, Benoît ULg

Conference (2007, November 27)

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Peer Reviewed
See detailLateral-torsional buckling of Stainless steel I-beams in case of fire
Vila Real, Paulo; Lopes, Nuno; Da Silva, Luis et al

Conference (2007, November 27)

Detailed reference viewed: 14 (0 ULg)