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See detailSelective epitaxial growth of III-V semiconductor on large-area Si substrate for advanced logic CMOS technologies
Nguyen, Ngoc Duy ULg; Brammertz, Guy; Wang, Gang et al

Conference (2010)

The continued downscaling of the metal-oxide semiconductor (MOS) transistor for sub-22 nm logic circuits with boosted performance will require the introduction of new channel materials with carrier ... [more ▼]

The continued downscaling of the metal-oxide semiconductor (MOS) transistor for sub-22 nm logic circuits with boosted performance will require the introduction of new channel materials with carrier mobility higher than that of Si, such as Ge for pMOS. The use of III-V compounds for nMOS devices poses however additional challenges related to the hetero-epitaxial growth of a polar semiconductor on a non-polar surface. Furthermore, these high-mobility materials have to be fabricated on large-area Si substrates, in the perspective of application in a standard low-cost very-large-scale integration scheme. In this work, we report on the successful growth of GaAs on 200 mm Si wafers by means of metal-organic vapor deposition using a modified Crius Close-Coupled Showerhead system from AIXTRON AG. We used Si (100) wafers with off-axis orientation (6° miscut towards <111>) in order to avoid the formation of anti-phase domains which lead to Ga-Ga and As-As bonds at their boundaries that have strong detrimental effects on the electrical conduction. In our approach, based on Ge virtual substrates with low threading dislocation (TD) density, the lattice mismatch between Si and GaAs is accommodated and, thus, no additional TD is introduced in the deposited III-V film. Our results show that smooth GaAs layers can be epitaxially grown on large-area Si substrates with high wafer-scale thickness uniformity. The excellent quality of the deposited GaAs was confirmed by photoluminescence and electron microscopy. Our process also demonstrates very high selectivity on patterned wafers with SiO2 mask and enabled the fabrication of capacitor structures using an integration process flow very similar to standard high volume Si manufacturing lines. The capacitance-voltage characteristics were similar to the ones obtained on a bulk GaAs substrate, and showed extremely tight within-wafer and wafer-to-wafer distributions as is standard to Si manufacturing. [less ▲]

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See detailNeurobiologie de la dépression
Scantamburlo, Gabrielle ULg

Conference (2010)

Detailed reference viewed: 50 (2 ULg)
Peer Reviewed
See detailModulation of the lipopeptide pattern secreted by Bacillus subtilis upon colonization of different plant roots
Ongena, Marc ULg; Cawoy, H.; Margiassi, M. et al

Conference (2010)

Detailed reference viewed: 15 (3 ULg)
Peer Reviewed
See detailQuelle psychologie scolaire en Belgique ?
Frenkel, Stéphanie ULg

Conference (2010)

Detailed reference viewed: 63 (17 ULg)
See detailL’e-learning, un moyen pour retrouver l’enseignement à la Socrate ?
Baeyens, Jean-Pierre ULg; Rorive, Dominique ULg; Maron, Séverine ULg

Conference (2010)

Le Campus Virtuel en Gestion a été créé à l’initiative de professeurs de trois grandes Ecoles de gestion en Communauté Française de Belgique. Ils ont pris conscience qu’ils ne pouvaient pas aborder le e ... [more ▼]

Le Campus Virtuel en Gestion a été créé à l’initiative de professeurs de trois grandes Ecoles de gestion en Communauté Française de Belgique. Ils ont pris conscience qu’ils ne pouvaient pas aborder le e-learning seuls et se sont entourés d’une équipe technico-pédagogique. Cette équipe a organisé un accompagnement de chaque professeur. La méthode de travail mise en place se centre d'une part sur le professeur et d'autre part sur les apprenants. Le professeur est à la fois l’auteur, l’expert contenu, il fixe les objectifs du cours et la méthodologie est structurée en fonction de ses besoins. Par contre, ce qui est nouveau pour lui c’est l’approche e-learning, le fait que celle-ci doit apporter de la valeur ajoutée pédagogique, obligeant dès lors l’enseignant à procéder à un redécoupage de son cours et à concevoir de nouvelles activités d’apprentissage à distance et en présentiel. En acceptant d’entrer dans cette démarche, il s’engage à développer de nouvelles compétences et entre dans une réflexion pédagogique sur son métier d’enseignant. [less ▲]

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See detailHow large is the Io UV footprint?
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010)

Located close to the feet of the magnetic field lines connecting Io to each Jovian hemisphere, the Io footprint is the auroral signature of the electromagnetic interaction between Io and Jupiter's ... [more ▼]

Located close to the feet of the magnetic field lines connecting Io to each Jovian hemisphere, the Io footprint is the auroral signature of the electromagnetic interaction between Io and Jupiter's magnetosphere. It consists of several spots followed downstream by an extended tail. The size of the main spot is expected to scale to the size of the interaction region close to Io. Consequently, this quantity is crucial to understand the processes involved. However, the main spot size is a controversial issue as previously published values range from ~400 km to ~10000 km, leading to contradictory conclusions. Based on observations carried on with the Hubble Space Telescope STIS and ACS FUV instruments from 1997 to 2009, we estimate the size of the main footprint spot on a much larger image sample than previously. Additionally, we carefully selected the images in order to avoid viewing geometry ambiguities when measuring the spatial extent of the different features. The main spot length along the footpath is ~900 km while its width perpendicular to the footpath is <200 km. The spot length is larger than the projected diameter of Io along unperturbed magnetic field lines, which appears to be consistent with recent simulations. The vertical extent and the peak altitude of the main spot are similar to those measured in the tail. Nevertheless, the secondary spot attributed to trans-hemispheric electron beams has been measured to peak at ∼200 km below the main spot and the tail, which confirms their different origins. [less ▲]

Detailed reference viewed: 34 (0 ULg)
Peer Reviewed
See detailSocial enterprise
Defourny, Jacques ULg

Conference (2010)

Detailed reference viewed: 18 (4 ULg)
See detailMorphemes in the mind: Are there graded effects of semantic similarity on morphological processing in children?
Deacon, Hélène; Downing, Jennifer; Gonnerman, Laura et al

Conference (2010)

Detailed reference viewed: 14 (0 ULg)
Peer Reviewed
See detailGender and Diversity: the intersectionality and transversality stakes
Cornet, Annie ULg; Johnson

Conference (2010)

Detailed reference viewed: 31 (2 ULg)
See detailMagnetic Susceptibility of Frasnian reefs and mounds from Eastern Belgium.
Demaude, Nicolas; Boulvain, Frédéric ULg; Cornet, Pierre et al

Conference (2010)

Detailed reference viewed: 19 (1 ULg)
See detailManipulating tissue metabolism by amino acids
Tesseraud, S.; Everaert, Nadia ULg; Boussaid-Om Ezzine, S. et al

Conference (2010)

Detailed reference viewed: 12 (0 ULg)
See detailModern approaches to Corpus Linguistics
Longrée, Dominique ULg

Conference (2010)

Detailed reference viewed: 2 (1 ULg)
Peer Reviewed
See detailIs left ventricular longitudinal function related to metabolic abnormalities and fat distribution?
Laret, V; Magne, Julien ULg; O'Connor, K et al

Conference (2010)

Detailed reference viewed: 4 (0 ULg)
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See detailCarbon dioxide and methane dynamics in estuaries
Borges, Alberto ULg; Abril, G.

Conference (2010)

Detailed reference viewed: 10 (0 ULg)
See detailFormer des enseignants en communauté française de Belgique
Longrée, Dominique ULg

Conference (2010)

Detailed reference viewed: 9 (4 ULg)
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See detailPratiques nouvelles en conception industrielle: adaptation des acteurs, des objets médiateurs et des modalités de travail.
Elsen, Catherine ULg; Dawans, Arnaud ULg

Conference (2010)

Une intervention in situ de deux mois au sein d’une équipe de conception de produits industriels (designers, dessinateurs), construite sur les méthodologies et théories de l’approche ergonomique « ... [more ▼]

Une intervention in situ de deux mois au sein d’une équipe de conception de produits industriels (designers, dessinateurs), construite sur les méthodologies et théories de l’approche ergonomique « compréhensive », interroge les pratiques nouvelles de ces métiers depuis l’avènement de la CAO. Les « objets médiateurs » sont considérés selon leurs apports respectifs et complémentaires et non plus selon une approche dichotomique, et leur étude structure l’ensemble du recueil des données. Une méthodologie de traitement et d’analyse des informations récoltées est présentée (approche chronologique et analyses « verticales » sur base de lignes du temps). Celle-ci nous permet de tracer les nombreuses adaptations dont font preuve les acteurs tout au long de leur processus: adaptations de leurs outils et représentations, de leurs modalités de travail individuelles ou collaboratives, adaptations et développement de nouvelles compétences. [less ▲]

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See detailEffects of Polychlorinated Biphenyls on Thyroid Hormone Physiology and Metabolism of European sea bass (Dicentrarchus labrax)
Schnitzler, Joseph ULg; Klaren, Peter; Celis, Niko et al

Conference (2010)

Studies in the laboratory have shown that a number of synthetic and natural chemicals can interfere with the endocrine system in fish. Among them, organic compounds such as pesticides and ... [more ▼]

Studies in the laboratory have shown that a number of synthetic and natural chemicals can interfere with the endocrine system in fish. Among them, organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters. Of particular interest are effects on thyroid function, but data on effects of PCB exposure on these hormones and related metabolism has been lacking. We propose here a thorough approach to assess effects of these compounds on the thyroid function of European sea bass (Dicentrarchus labrax). An experimental exposure of sea bass to commercial PCB mixtures has been designed to understand underlying toxicity mechanisms and effects on the thyroid system. After 120 days of exposure, muscular thyroid hormone concentrations and the main metabolic pathways for thyroid hormones (deiodination, glucuronidation and sulfatation) were assessed. Exposure to environmental relevant doses of PCB (from 0.3 to 0.9 ppm [7 ICES PCB]). alters hepatic T4 outer ring deiodinase and T4 sulfatation whereas T4 glucuronidation was not affected. Owing to the extensive autoregulatory feedback at both central and peripheral levels, the thyroid hormone concentrations were preserved despite the PCB induced changes in thyroid hormone dynamics. At 10 times higher concentrations (10 ppm [7 ICES PCB]). an important depression of muscular T3 and T4 levels could be observed which are apparently caused by other mechanisms than metabolic pathways. Further analysis is required to evaluate thyroid gland function and secretion. These results support the observations made in our field study in wild sea bass (Dicentrarchus labrax) from coastal regions near several important European rivers mouths. [less ▲]

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See detailNiveau de contamination et spéciation des métaux lourds dans l'Oued Fès et l'Oued Sebou.
Bouezmarni, Mohamed ULg; Debbaut, Vincent ULg; Diouri, S. El Edrissi et al

Conference (2010)

Detailed reference viewed: 52 (7 ULg)
Peer Reviewed
See detailPolychlorinated Biphenyls affect Histological Appearance of European sea bass (Dicentrarchus labrax) Thyroids
Schnitzler, Joseph ULg; Klaren, Peter; Celis, Niko et al

Conference (2010)

Polychlorobiphenyls (PCBs) are well-described endocrine disrupters and of particular interest are effects on thyroid function. We propose here a thorough approach to assess effects of these compounds on ... [more ▼]

Polychlorobiphenyls (PCBs) are well-described endocrine disrupters and of particular interest are effects on thyroid function. We propose here a thorough approach to assess effects of these compounds on the thyroid function of European sea bass (Dicentrarchus labrax). An experimental exposure of sea bass to commercial PCB mixtures has been designed to understand underlying toxicity mechanisms and effects on the thyroid system. After 120 days of exposure histological appearance of thyroid tissue was assessed by light and electron microscopy. The follicle area, perimeter, diameter, length and with of every follicle cross section were interactively measured. The shape of the follicles was described with three dimensionless shape descriptors: roundness, form factor and aspect ratio. The histomorphometrical analysis showed a greater heterogeneity of thyroid follicle diameter and especially higher epithelial cell heights in sea bass exposed to environmental relevant doses of PCB (from 0.3 to 0.9 μg g-1 [7 ICES PCB]). Ultrastructural histological investigations showed that the epithelial cells surrounding the bigger follicles present an higher accumulation of colloid droplets. This was interpreted to be the result of increased stimulation of follicular cells. No differences in shape could be identified among the different treatment groups The size of the follicles and the form of the follicular cells gives an indication of the secretary activity of the gland. These observations support the hypothesis that the contamination of PCB mixtures can induce a hyperactivity of the thyroid tissue. These observations were confirmed by measurements of muscular thyroid hormone concentrations and activity thyroid hormone metabolism. [less ▲]

Detailed reference viewed: 79 (1 ULg)
See detailSlide seminar: Recurrent nevus
QUATRESOOZ, Pascale ULg

Conference (2010)

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See detailDE LA CULTURE ITINERANTE SUR BRULIS AUX JACHERES ENRICHIES PRODUCTRICES DE CHARBON DE BOIS, EN R. D. DU CONGO
Peltier, Régis; Bisiaux, Franck; Dubiez, Emilien et al

Conference (2010)

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of ... [more ▼]

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of degraded forest. Estimated fuelwood consumption is in the range of 3 to 6 million tones of fuelwood equivalent per year (representing 0.6 to 1.2 MT of charcoal per year if all the wood were charcoaled). The Mampu project was designed as the pilot phase of a reforestation project covering 100 000 hectares of sandy soil on the Bateke plateau and aiming to remedy wood and charcoal scarcities. Despite the conflicts, about 8000 hectares of Acacia auriculiformis were planted, mainly from 1987 to 1993. From about 1994, the Mampu plantation was divided into 25 hectare plots for 320 farming families. Cultivation mainly follows the agroforestry pattern based on improved fallows, which draws on traditional slash-and-burn farming. Total charcoal production from the plantation varies from 8 000 to 12 000 tonnes per year, in addition to 10 000 T/year of cassava, 1 200 T/year of maize and 6 T/year of honey. The success of the project is an incentive to apply the model to the savanna lands on the Bateke plateaus, taking traditional land rights into consideration and continuing activities to diversify and process production locally. This will help to cover a larger share of urban needs for renewable energy while also creating rural employment. However, other agroforestry systems deserve to be tested or developed for different ecological and social or economic conditions across the country, such as management of the natural regrowth of local multiple-use species as applied with the traditional system of fallow enrichment (Nkunku) in the Lower Congo. [less ▲]

Detailed reference viewed: 87 (22 ULg)
See detailLes concepts de l'égalité et de la diversité
Cornet, Annie ULg

Conference (2010)

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See detailHow bright is the Io UV footprint?
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010)

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint ... [more ▼]

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint emissions in both hemispheres. Recent results showed that this footprint is formed of several spots and an extended tail. Each feature is suggested to correspond to a different step in the propagation of the perturbation and in the electron energization processes. The present study focuses on the variations of the spots' brightness at different timescales from minutes to years through the rotation period of Jupiter. It relies on FUV images acquired with the STIS and ACS instruments onboard the Hubble Space Telescope. Since the footprint is composed of several localized features, a good understanding of the emission region geometry is critical to derive the actual vertical brightness and thus the precipitated energy flux. We developed a 3D emission model in order to assess as precisely as possible the respective contribution of each individual feature and to correctly estimate the precipitating energy flux. As far as the brightness variations on timescales of minutes are concerned, we will present results from the high time resolution campaign executed during summer 2009. On timescale of several hours, we will show that the variation of the emitted power as a function of the location of Io in the plasma torus suggests that the Jovian surface magnetic field strength is an important controlling parameter. Finally, the measured precipitated power and particle fluxes will be discussed in comparison with recent simulations considering both Alfvén waves filamentation and electron acceleration when the Alfvén waves become inertial. [less ▲]

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See detailAppétence et adhérence des systèmes de réparation : importance de la préparation du support
Courard, Luc ULg

Conference (2010)

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ... [more ▼]

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ainsi que de l’environnement dans lequel le contact est créé. Elle s’exprime habituellement en termes de variations dimensionnelles, de perméabilité et de propriétés chimiques et électrochimiques. Ces propriétés sont évoquées ou développées pour chacun des matériaux mis en présence : rugosité, porosité, cohésion superficielle et eau interstitielle pour le béton ; retrait, fluage, rigidité, absorption capillaire pour les produits de réparation. Trois conditions fondamentales nécessaires et suffisantes au développement de l’adhérence en tant que signe de la compatibilité entre matériaux sont évoquées et illustrées pour le cas particulier de la préparation de surface : sablage, burinage, hydro démolition, marteau-piqueur, … ont un effet spécifique non seulement sur la rugosité, et donc l’accrochage mécanique du système de réparation, mais aussi sur la cohésion de la couche superficielle du béton [less ▲]

Detailed reference viewed: 54 (1 ULg)
See detailUVIS FUV spectra of Saturn’s aurora
Gustin, Jacques ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2010)

Detailed reference viewed: 11 (0 ULg)
See detailDe la "fabrication" à la perception d’une action publique : la lutte contre le travail des enfants au Burkina Faso
Wouango, Joséphine ULg

Conference (2010)

Ma communication présente deux parties de ma thèse. La première partie concerne l’analyse historique et thématique des réponses de différents acteurs à la lutte contre le travail des enfants au Burkina ... [more ▼]

Ma communication présente deux parties de ma thèse. La première partie concerne l’analyse historique et thématique des réponses de différents acteurs à la lutte contre le travail des enfants au Burkina Faso: les pouvoirs publics, les acteurs de la société civile, les partenaires techniques et financiers, les partenaires sociaux. La deuxième partie présente l’analyse des résultats des deux enquêtes ethnographiques auprès des enfants et jeunes travailleurs. En m’appuyant sur la théorie de l’acteur social et des bases théoriques du nouveau paradigme de la sociologie de l’enfance (James & Prout, 1990), je confronterai les attentes, les expériences individuelles et collectives des enfants travailleurs aux réponses politiques et associatives de lutte contre le travail des enfants au Burkina Faso. [less ▲]

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See detailEnjeux fonciers et exploitation du bois-énergie en périphérie de Kinshasa, RDC
Vermeulen, Cédric ULg; Mutambwe, Shango; Dubiez, Emilien et al

Conference (2010)

L’identification des acteurs, des finages, des dynamiques sociales locales et du rapport à la terre et aux ressources naturelles constitue un préalable à toute intervention dans les zones péri-urbaines ... [more ▼]

L’identification des acteurs, des finages, des dynamiques sociales locales et du rapport à la terre et aux ressources naturelles constitue un préalable à toute intervention dans les zones péri-urbaines soumises à forte pression anthropique. En République Démocratique du Congo, la capitale Kinshasa, mégapole en pleine extension, engendre une pression considérable sur les ressources ligneuses dans les finages des villages situés dans sa grande périphérie. La présente communication décrit les rapports des acteurs aux espaces-ressources dans deux zones (Bas-Congo et plateau Bateke) situées en périphérie de cette ville, zones considérées comme des bassins d’approvisionnement en bois-énergie. Les deux sites différent en termes de pression foncière (très élevée dans le Bas-congo, centrée sur les forêts galerie sur les plateaux Bateke) mais présentent les mêmes faciès de surexploitation des ressources ligneuses. Dans les deux cas, la gestion locale, aux mains des chefs de villages ou des chefs de lignée, a failli. La volonté de reboisement est aussi grande au Bas-Congo qu’elle semble moins développée sur les plateaux. Dans les deux situations, la pratique du retour rapide sur la formation végétale (pour l’agriculture ou pour l’exploitation du charbon de bois) hypothèque la possibilité de régénération de la plupart des essences locales. [less ▲]

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See detailOceanic CO2 sink: the contribution of the marine cryosphere
Delille, Bruno ULg; Vancoppenolle, M.; Tilbrook, B. et al

Conference (2010)

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Peer Reviewed
See detailEffect of rosemary extract and related flavonoid carnosol on chondro-protection and on the bone-cartilage crosstalk
Horcajada, Marie-Noelle; Sanchez, Christelle ULg; Scalfo, Fanny et al

Conference (2010)

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See detailComment la confiance envers le supérieur hiérarchique influence la créativité et le voice des employés. Le rôle du sentiment de responsabilité.
De Zanet, Fabrice ULg

Conference (2010)

Les entreprises attendent de plus en plus de leurs employés qu’ils soient proactifs et prennent des initiatives. Or, un employé qui est proactif prend un risque, car son initiative peut être perçue ... [more ▼]

Les entreprises attendent de plus en plus de leurs employés qu’ils soient proactifs et prennent des initiatives. Or, un employé qui est proactif prend un risque, car son initiative peut être perçue négativement par la hiérarchie. Detert et Burris (2007) postulent ainsi que la décision d’être proactif résulte d’un calcul coûts-bénéfices. Par ailleurs, un employé est d’autant plus enclin à prendre des risques qu’il fait confiance à son supérieur hiérarchique (Mayer, Davis, & Schoorman, 1995). En conséquence, la confiance des employés envers leur supérieur hiérarchique est certainement un facteur clé dans l’adoption par les employés de comportements proactifs. Néanmoins, il reste encore à comprendre le mécanisme à travers lequel la confiance envers le supérieur hiérarchique influence la proactivité des employés. L’objectif de cet article est de montrer comment la confiance des employés envers le supérieur hiérarchique influence - via le sentiment de responsabilité des employés - l’adoption de deux comportements proactifs, à savoir la créativité, c'est-à-dire le fait de proposer des idées innovantes et utiles, et le voice, c'est-à-dire le fait de faire remonter des informations potentiellement critiques à propos du fonctionnement de l’organisation. Les analyses réalisées sur 111 paires employés-supérieurs montrent que la confiance envers le supérieur hiérarchique agit sur le niveau créativité et de voice des employés et que cette influence est médiée par le fait que ces derniers se sentent davantage responsables d’apporter des changements constructifs dans leur travail. [less ▲]

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See detailStrengthening local innovations in rice processing through video in Benin
Zossou, Espérance; Van Mele, P.; Vodouhe, D. S. et al

Conference (2010)

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before ... [more ▼]

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before milling. Parboiling is a transformation process that enhances the quality of rice. This important income generating activity is exclusively done by women from rice producing communities. In Benin, the traditional parboiling method is still prevailing and does not lead to quality rice. To address this, an improved rice parboiling technology was developed. AfricaRice subsequently developed a video where rural women explain how to use this improved technology. Four NGOs in central Benin publicly screened the video in 80 villages. After women watched the video, they started using the improved parboiler equipment individually or collectively. Women who didn’t have the financial support to buy the improved equipment understood its principle and developed creative solutions based on the idea of pre-cooking paddy with steam. Video watching also made women pay attention to reducing the loss of steam and to use local resources innovatively to conserve energy. Women also improved the quality of their parboiled rice by removing dirt, properly washing rice and drying rice on tarpaulins. On the other hand, in the north and south of Benin where there were no public video screenings, the traditional rice parboiling method is still predominant. This study shows the potential of farmer-to-farmer video to improve farmers’ practices and their attitudes to work collectively in agro-processing and marketing. [less ▲]

Detailed reference viewed: 53 (12 ULg)
Peer Reviewed
See detailInterplay between non-death and death TNFR in inflammation.
Dejardin, Emmanuel ULg

Conference (2010)

Detailed reference viewed: 9 (4 ULg)
See detailLa biopolitique et les nouveaux pouvoirs sur la vie
Caeymaex, Florence ULg

Conference (2010)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailPerceiving prosodic prominence in a second language
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2010)

Detailed reference viewed: 17 (0 ULg)
See detailEnsemble-based assimilation of high-frequency radar surface currents in regional ocean models
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Beckers, Jean-Marie ULg et al

Conference (2010)

The results of coastal ocean models depend critically on the accuracy of boundary and initial conditions and atmospheric forcing. The precision of coastal ocean models is limited among others by ... [more ▼]

The results of coastal ocean models depend critically on the accuracy of boundary and initial conditions and atmospheric forcing. The precision of coastal ocean models is limited among others by uncertainty in those forcing fields. Since high-frequency (HF) radar installations provide measurements over a relatively large area, the assimilation of these data has a high potential to reduce the errors in ocean models and to provide a dynamically consistent estimation of the ocean circulation. The assimilation of HF radar data is not without its own challenges: the spatial variation of the surface currents uncertainty, the high temporal resolution of HF radar data, the simultaneous presence of a wide range of processes with distinct spatial and temporal scales (tides and other surface gravity waves, mesoscale and wind-driven circulation), and the generally strong sensitivity of regional models to errors in the boundary conditions and atmospheric forcings. These processess are important aspects to consider in the application of data assimilation methods to HF radar measurements. The results of two data assimilation experiments on the West Florida Shelf (WFS) and the German Bight are presented. HF radar currents are assimilated in a nested West Florida Shelf based on an ensemble of model realizations with different wind forcings. The model is sequentially updated and a filter is implemented to reduce spurious surface-gravity waves. Results of the WFS model assimilating surface currents show an improvement of the model currents not only at the surface but also at depth compared to independent ADCP observations. This West Florida Shelf assimilation experiment does not include tides. Tides are not generated within the domain, but are rather propagated inside the domain through the boundary conditions. The potential of using HF radar data to reduce errors in tidal boundary conditions is shown in a model setup of the German Bight. For improving the modeled tidal variability it is not sufficient to update the model state without updating the boundary conditions. An ensemble smoother to improve the tidal boundary values is presented and validated with independent HF radar measurements and tide-gage data. The ensemble-scheme is also applied to improve the wind forcing by assimilation of surface currents. The improvement of the analyzed wind forcing is assessed by using in-situ wind measurements. [less ▲]

Detailed reference viewed: 29 (2 ULg)
See detailla gestion des âges
Cornet, Annie ULg

Conference (2010)

Detailed reference viewed: 48 (18 ULg)
Peer Reviewed
See detailL’entrepreneurship senior
Cecchini, Isabelle ULg; huby, E.; Cornet, Annie ULg

Conference (2010)

Detailed reference viewed: 23 (4 ULg)
See detailThe Lower to Middle Devonian transitional flora from Dechra-Aït-Abdallah (Morocco).
Prestianni, Cyrille ULg; Meyer-Berthaud, Brigitte; Gerrienne, Philippe ULg

Conference (2010)

Detailed reference viewed: 13 (1 ULg)
See detailEvolution of anatomical complexity, including an early type of cambium, in Psilophyton-grade plants.
Strullu-Derrien, Marie-Christine; Gensel, Patricia G.; Gerrienne, Philippe ULg

Conference (2010)

Detailed reference viewed: 20 (1 ULg)
See detailLes dispositifs en faveur de l’égalité hommes-femmes.
Cornet, Annie ULg

Conference (2010)

Detailed reference viewed: 18 (2 ULg)
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See detailProsodic marking of information status in Dutch and French as foreign languages. Production and perception
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2010)

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailStudy of the degradation mechanisms of Prussian Blue in paint layers by X-ray absorption spectroscopy
Samain, Louise ULg; Silversmit, Geert; Vekemans, Bart et al

Conference (2010)

Detailed reference viewed: 63 (8 ULg)
Peer Reviewed
See detailUnraveling the roles of lipopeptides on ISR
Ongena, Marc ULg; Jourdan, E.; Henry, G. et al

Conference (2010)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailTool use and site function in the European Middle Palaeolithic
Rots, Veerle ULg

Conference (2010)

Detailed reference viewed: 16 (2 ULg)
See detailElectronic spectroscopy of nucleic acids in the gas phase
Gabelica, Valérie ULg; Rosu, Frédéric ULg; Joly, Laure ULg et al

Conference (2010)

DNA polyanions trapped in a mass spectrometer undergo electron detachment following UV irradiation. Photodetachment is a single-photon process. Its efficiency depends on the nature of the DNA bases, the ... [more ▼]

DNA polyanions trapped in a mass spectrometer undergo electron detachment following UV irradiation. Photodetachment is a single-photon process. Its efficiency depends on the nature of the DNA bases, the ion's charge, and the excitation wavelength. Photodetachment can therefore be used to perform ion spectroscopy experiments, which probe electronic excitation within the initial charge state of the nucleic acids. Ion spectroscopy experiments on trapped nucleic acid cations and anions were performed from 4 to 20 eV using an OPO laser or using synchrotron radiation. Photoelectron spectroscopy experiments were also performed on multiply charged anions to probe direct detachment cross sections and electronic excitations within the final charge. The electronic spectra obtained from photodetachment integral cross sections show several resonances, provided that the photon energy is larger than the electron binding energy. We will also discuss whether the electronic spectra obtained via photodetachment can be used to probe gas phase ion structure. [less ▲]

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See detailTNFR-induced activation of MAP3K14/NIK enhances TNFR1-induced cell death
Boutafalla, Layla; Bertrand, Mathieu; Remouchamps, Caroline ULg et al

Conference (2010)

Detailed reference viewed: 31 (6 ULg)
See detailEnsemble smoother for optimizing tidal boundary conditions and wind forcing by assimilation of High-Frequency Radar surface currents measurements of the German Bight
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Staneva, Joanna et al

Conference (2010)

An ensemble smoother scheme is presented to assimilate HF radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To create an ensemble of ... [more ▼]

An ensemble smoother scheme is presented to assimilate HF radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To create an ensemble of dynamically realistic tidal boundary conditions, a cost function is formulated which is directly related to the probability of each perturbation. This cost function ensures that the perturbations are spatially smooth and that the structure of the perturbations satisfies approximately the harmonic linearized shallow water equations. Based on those perturbations an ensemble simulation is carried out using the full three-dimensional General Estuarine Ocean Model (GETM). Optimized boundary values are obtained using all observations within the assimilation period using the covariances of the ensemble simulation. The approach acts like a smoother scheme since all observations are taken into account. Since the scheme aims to derive the optimal perturbation, it might be called Ensemble Perturbation Smoother. The final analysis is obtained by rerunning the model using the optimal perturbation to the boundary conditions. The analyzed model solution satisfies thus the model equations exactly and does not suffer from spurious adjustments often observed with sequential assimilation schemes. Model results are also compared to independent tide gage data. The assimilation did also reduce the model error compared to those sea level observations. The same scheme has also been used to correct surface winds. Surface winds are crucial for accurately modeling the marine circulation in coastal waters. The method is validated directly by comparing the analyzed wind speed to in situ measurements and indirectly by assessing the impact of the corrected winds on sea surface temperature (SST) relative to satellite SST. [less ▲]

Detailed reference viewed: 19 (1 ULg)
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See detailIsotope shifts and hyperfine structure of the Fe I 372-nm resonance line
Oppel, S.; Krins, Stéphanie ULg; Huet, Nicolas ULg et al

Conference (2010)

Detailed reference viewed: 44 (16 ULg)
See detailExpériences belges en matière d’équité salariale
Cornet, Annie ULg

Conference (2010)

Detailed reference viewed: 47 (4 ULg)