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See detailNew pH-sensitive flower micelles for drug delivery systems
Cajot, Sébastien ULg; Van Butsele, Kathy; Jérôme, Christine ULg

Poster (2008, June 23)

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See detailDevelopment of a decision-making tool to manage forest storm damage in the Walloon Region (Belgium)
Riguelle, Simon ULg; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, June 03)

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the ... [more ▼]

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the concerned owners as well as by the whole sector of wood transformation. The aim of this research, which is a regional priority, relates to the realization of a decision-making tool thought not under the constraint of the urgency, when trees are lying down on the ground, but established on the basis of real dramatic cases already experienced in the past. The tool is dedicated to political and administrative services but, to be effective, calls upon a broad collaboration with all the partners of the wood sector. [less ▲]

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See detailSupercritical carbon dioxide, a tool for the dispersion ROP of lactone and PCL foaming: Part A
Grignard, Bruno ULg; Urbanczyk, Laetitia ULg; Stassin, Fabrice et al

Poster (2008, June 02)

Aliphatic polyesters, namely polylactide (PLA) and poly-ε-caprolactone (PCL) are biodegradable and biocompatible materials that find applications as resorbable suture (PLA) and drugs delivery vectors (PCL ... [more ▼]

Aliphatic polyesters, namely polylactide (PLA) and poly-ε-caprolactone (PCL) are biodegradable and biocompatible materials that find applications as resorbable suture (PLA) and drugs delivery vectors (PCL). Nevertheless, these polymers were mainly prepared by ring opening polymerization using aluminum alkoxide or tin alkoxide initiators in organic media. Recently, the use of supercritical carbon dioxide as polymerization medium was proposed as a potential alternative to the use toxic organic solvents. Nevertheless, due to the non-solubility of PCL in this medium, the growing chains rapidly precipitate during their synthesis leading to the formation of a bulky material that is typical of a precipitation polymerization. This work aims at investigating the dispersion ring-opening polymerization (ROP) of ε-caprolactone in the presence of fluoropolymer-based stabilizers, that were prepared by combining the ring opening polymerization of ε-caprolactone and atom transfer radical polymerization of heptadecafluorodecylacrylate (AC8) and so, stabilizing PCL micrometric particles in supercritical carbon dioxide. In practice, the ROP of CL was initiated by dibutyltin dimethoxide in the presence of PCL-b-PAC8 diblock stabilizers of differents molecular weight and composition. After 24h at 40°C, PCL was collected as a powder that consists of small-sized microspheres. Finally, post-polymerization purification of PCL (removal of tin catalyst that may lead to toxicological problems) was demonstrated to be quite feasible by supercritical fluid extraction (SFE) leading to the preparation of PCL with low catalytic residues. The second goal of this work aims at reporting on the use of sc CO2 for the preparation of foams of poly(epsilon-caprolactone) (PCL), that could be useful in the packaging sector and/or the biomedical sector as potential scaffolds for tissue engineering but also as substitutes for polystyrene thermoformed trays. The method that consists of saturating a polymer with a compressed or supercritical fluid, such as carbon dioxide followed by depressurization and polymer expansion was investigated. Indeed, no residual product is left in the foam, no toxic gas is produced and no resort to hydrocarbon solvents is required. Moreover, CO2 is cheap, non-toxic, recyclable, non-flammable and the technology of CO2-assisted foaming can be used in either a batch mode or in a continuous mode within a high-pressure extruder. [less ▲]

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See detailClimatology and circulation of the Azores-Canary region by Data-Interpolation Variational Analysis
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Poster (2008, June 02)

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See detailEfficiency of sieving or classification for dry fractionation of aot mills and beta-glucans enrichment.
Roiseux, Olivier; Vanderbeke, E.; Blecker, Christophe ULg et al

Poster (2008, June)

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See detailStatistical validation of the Positive and Negative Occupational Stress Inventory.
Barbier, Marie ULg; Peters, Stéphanie ULg; Hansez, Isabelle ULg

Poster (2008, June)

With the emergence of positive psychology a decade ago, focus on psychology has shifted from human weaknesses to human resources. In work psychology, researchers are interested not only in negative ... [more ▼]

With the emergence of positive psychology a decade ago, focus on psychology has shifted from human weaknesses to human resources. In work psychology, researchers are interested not only in negative responses to professional demands, but also in positive responses. The Positive and Negative Occupational Stress Inventory (PNOSI) was designed to measure both constructs with separate items. This idea was later confirmed by Schaufeli, Salanova, Gonzalez-Roma & Bakker (2002) , according to which positive and negative occupational stress are distinct constructs with different causes and consequences, and should be measured with different items. We first asked 150 psychology students to generate words describing positive and negative stress. This enabled us to elaborate 34 items relating to emotional, cognitive, behavioural and physiological stress manifestations. These items were administered to 152 workers. Exploratory factor analyses showed a two-factor underlying structure. The first factor consisted of eleven items measuring Negative Occupational Stress (NOS), the second consisted of eight items measuring Positive Occupational Stress (POS). This structure was tested on another sample of 4666 workers. Exploratory factor analyses confirmed the two-factor structure. The two subscales have good psychometric properties, α = .87 and α = .84 for NOS and POS, respectively. Results show that the PNOSI can be considered a valid tool for measuring positive and negative sides of well-being at work. Further confirmatory factor analyses should first try to confirm and replicate this structure on different samples. Second, convergent and discriminant validity with related concepts, such as burnout and engagement, should also be tested. [less ▲]

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See detailImpact of pre-treatment processing on cereal by-products valorisation through enzymatic extraction of ferulic acid.
Barberousse, Hélène; Roiseux, Olivier; Deroanne, Claude et al

Poster (2008, June)

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See detailFast mapping between grammatical constructions and meaning: An experiment in French children aged 3 to 4
Parisse, Christophe; Dupont, Fanny; Bourdoux, Françoise et al

Poster (2008, June)

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See detailMolecular modelling study of bis-isoquinolinium derivatives as small conductance Ca2+ - activated K+ channel blockers
Dilly, Sébastien ULg; Graulich, Amaury; Chavatte, Philippe et al

Poster (2008, May 30)

Small conductance calcium-activated potassium channels (SK) are widely expressed throughout the central nervous system and the periphery. Three subtypes of SK channels have been identified so far in ... [more ▼]

Small conductance calcium-activated potassium channels (SK) are widely expressed throughout the central nervous system and the periphery. Three subtypes of SK channels have been identified so far in different parts of the brain. Activation of SK channels by a rise in intracellular calcium leads to the hyperpolarisation of the membrane, hence reducing cell excitability. Blocking the SK channels might be beneficial for the treatment of depression, Parkinson’s disease and cognitive disorders. In this context, starting from the scaffold of N-methyl-laudanosine (NML) which is a known SK channel blocker (Scuvée-Moreau et al., 2002), a series of original bis-isoquinolinium derivatives were synthezised and evaluated for their affinity on the apamin-sensitive sites (Graulich et al., 2007). These quaternary compounds are powerful blockers, and the most active ones have 10 times more affinity for SK channels than dequalinium. Based on a conformational analysis, a molecular modeling study was also performed. The heads of the various conformational families were compared to a pharmacophoric model previously described (Dilly et al., 2005). The in silico results are well correlated by the in vitro binding studies. Firstly, a 6,7-dimethoxy or a 6,7,8-trimethoxy substitution is shown to be favourable. Secondly, although the length of the linker has no significant influence in the alkane derivatives, the ortho and meta linkers lead to more favourable conformations than the para linker in the xylene derivatives. [less ▲]

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See detailNeural network involved in self-judgment in young and elderly adults
Feyers, Dorothée ULg; Collette, Fabienne ULg; D'Argembeau, Arnaud ULg et al

Poster (2008, May 29)

In agreement with the literature, we have recently observed that the ventro-medial prefrontal cortex (VMPFC) is activated both in young and elderly subjects during a adjective judgment task requiring ... [more ▼]

In agreement with the literature, we have recently observed that the ventro-medial prefrontal cortex (VMPFC) is activated both in young and elderly subjects during a adjective judgment task requiring judgment about self vs. other in the context of a first (1PP) or third (3PP) perspective-taking (Ruby et al., submitted). Here, we have performed functional connectivity analyses to determine the network of cerebral areas associated to the performance of young and elderly subjects. <br />Results indicate that, in the 1PP condition, activity of the VMPFC is related to the inferior frontal gyrus, parahippocampal gyrus in elderly but to the occipital cortex only in young subjects. In the 3PP condition, functional connectivity exist between the VMPFC and medial frontal gyrus, inferior frontal gyrus and superior temporal areas in elderly, but with occipital and parietal areas only in young subjects. <br />The cerebral areas associated to VMPFC activity in young subjects were previously described as involved both in autobiographical memory retrieval and mentalizing processes. With regard to elderly, the cerebral network evidenced is related to retrieval of semantic and episodic memories (parahippocampal and superior temporal) but also to the attribution of emotional valence to the adjectives (inferior frontal) and perspective taking (medial frontal gyrus). <br />These results indicate (1) that the VMPFC is connected to a larger cerebral network in elderly than in young subjects during self judgements; (2) that young subjects perform the task on the basis of autobiographical information retrieval only, while elderly subjects use supplementary, more reflexive, cognitive processes. [less ▲]

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See detailChlamydomonas reinhardtii proteomics adaptations in response to the absence of the energy-dissipating alternative oxidase
Mathy, Grégory ULg

Poster (2008, May 28)

The Alternative oxidase (AOX) is an ubiquinol-oxygen oxidoreductase found in the mitochondrial inner membrane of plants, fungi and protists. In mitochondria, AOX activation creates an electron ... [more ▼]

The Alternative oxidase (AOX) is an ubiquinol-oxygen oxidoreductase found in the mitochondrial inner membrane of plants, fungi and protists. In mitochondria, AOX activation creates an electron partitioning between the cytochrome pathway (CIII + CIV) and AOX. This partitioning leads to a decrease of proton pumping efficiency by the respiratory chain complexes per O2 consumed. Two closely related physiological roles are attributed to AOX: First, AOX in conjunction with rotenone insensitive NADH dehydrogenases, generates a fully non-coupled (energy dissipative) electron transport chain in the mitochondria, which is believed to play an important role in regenerating oxidized cofactors required for others metabolic demands. The second proposed role of AOX is to prevent an important increase the QR/Qt ratio and consequently, to prevent reactive oxygen species (ROS) production. In Chlamydomonas reinhartii AOX is encoded by two different genes, the AOX1 gene being much more transcribed than AOX2. In addition, the expression of the AOX1 gene is generally unresponsive to a number of known AOX allosteric effectors, but is down-regulated by ammonium and up-regulated by nitrate. In the present work, we performed a comparative proteomic study of isolated mitochondria by using the 2D-DIGE methodology to evidence the effects of AOX1 silencing on Chlamydomonas mitochondrial soluble proteome cultivated on nitrate in myxotrophic conditions [less ▲]

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See detailDéveloppement d'un outil d'aide à la décision pour la gestion des chablis en Région wallonne (Belgique)
Riguelle, Simon ULg; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, May 27)

L’apparition inopinée d’un chablis de grande ampleur nécessite une réaction appropriée et rapide de la part des pouvoirs publics, des propriétaires concernés et des partenaires de la filière bois. Hélas ... [more ▼]

L’apparition inopinée d’un chablis de grande ampleur nécessite une réaction appropriée et rapide de la part des pouvoirs publics, des propriétaires concernés et des partenaires de la filière bois. Hélas, la multitude de cas de figure, l’importance des dégâts, la complexité de la situation et le désarroi profond des acteurs ne permettent généralement pas d’avoir une vision globale et fiable du problème dans un délai qui doit nécessairement être très bref, s’agissant d’un matériau biologique périssable. L’objectif de cette recherche, qui est une priorité régionale, porte sur la réalisation d’un outil d’aide à la décision conçu non pas sous la contrainte de l’urgence, mais établi sur base de cas réels vécus lors des derniers épisodes dramatiques. [less ▲]

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See detailMicroscopie virtuelle appliquée à l'anatomie du bois
Jourez, Benoît ULg; Hérin, Michel; Gheysen, Thibaut ULg et al

Poster (2008, May 27)

La microscopie virtuelle est une approche innovante, complémentaire à la microscopie optique classique. Elle permet le traitement et la transmission d'images de coupes anatomiques digitalisées à très ... [more ▼]

La microscopie virtuelle est une approche innovante, complémentaire à la microscopie optique classique. Elle permet le traitement et la transmission d'images de coupes anatomiques digitalisées à très haute résolution. Les images peuvent être observées à l'écran, sous différents grossissements, mais aussi annotées et organisées en bases de données. Ce nouvel outil ouvert au dialogue et à l’auto-apprentissage est destiné à servir de support didactique dans le cadre de formations sur l'anatomie du bois. Le logiciel prévoit la sélection d’une coupe identifiée par l’essence et un plan ligneux dans une base de données accessible par Internet et organise la prospection de cette coupe selon différents grossissements. Au stade de développement actuel, le logiciel permet de se familiariser à la reconnaissance des plans ligneux de différentes essences forestières et met à la disposition de l'utilisateur divers outils interactifs. Il permet également à l'enseignant de pointer des éléments caractéristiques visibles à différents grossissements et d'y adjoindre des explications ou, a contrario, à pointer des éléments qui devront être identifiés par les étudiants. [less ▲]

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See detailRelation sylviculture - qualité du bois du douglas (Pseudotsuga menziesii) en Région wallonne
Henin, Jean-Marc; Pollet, Caroline; Ponette, Quentin et al

Poster (2008, May 27)

A partir d'un échantillon de peuplements présentant des sylvicultures contrastées, le projet a pour objectif de déterminer les limites de vitesse de croissance qui garantissent l’adéquation de la ... [more ▼]

A partir d'un échantillon de peuplements présentant des sylvicultures contrastées, le projet a pour objectif de déterminer les limites de vitesse de croissance qui garantissent l’adéquation de la production ligneuse à la demande de l’industrie. C’est pourquoi le projet vise à étudier les relations entre les propriétés du bois et les caractéristiques du traitement sylvicole appliqué aux peuplements de douglas dans les conditions environnementales de la Région wallonne. [less ▲]

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See detailAnalyse des caractéristiques intrinsèques du bois de robinier (Robinia pseudoacacia L.)
Pollet, Caroline; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, May 27)

Compte tenu de ses nombreuses qualités tant écologiques (fleurs mellifères, fixation de l’azote atmosphérique, fixation des sols) que technologiques (très bonne durabilité naturelle,très bonnes ... [more ▼]

Compte tenu de ses nombreuses qualités tant écologiques (fleurs mellifères, fixation de l’azote atmosphérique, fixation des sols) que technologiques (très bonne durabilité naturelle,très bonnes résistances mécaniques), reportées par des études menées en Amérique du nord et en Europe de l’Est, le robinier permettrait d’apporter un élément de réponse aux objectifs de gestion durable et de diversification de nos forêts. Un premier objectif du projet consiste à caractériser la ressource sur base de paramètres décrivant les arbres sur pied, un second à analyser les caractéristiques intrinsèques du bois sur base de ses propriétés physiques, mécaniques et de durabilité naturelle. Un troisième objectif s'attache à déterminer les potentialités d'utilisation industrielle du bois de robinier dans des usages valorisants tels que la fabrication de châssis de fenêtre et de lames de plancher. [less ▲]

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See detailConstruction and Validation of a Phonological Awareness Test Battery for Nursery School Pre-Reading Children
Gabriel, Audrey ULg; Poncelet, Martine ULg

Poster (2008, May 26)

Many studies have shown that the level of development of phonological skills at nursery school is a good indicator of future success in reading acquisition. The aim of this project was to construct and ... [more ▼]

Many studies have shown that the level of development of phonological skills at nursery school is a good indicator of future success in reading acquisition. The aim of this project was to construct and validate a comprehensive phonological awareness test battery for French speaking children. For preschool-level French speaking children, validated phonological awareness test batteries are still lacking. A longitudinal study design was used from a sample of sixty-four children provided education for in the French Community of Belgium. The battery was designed to assess phonological awareness at the rhyme, syllable and phoneme level. A further characteristic of this battery was to use attractive pictorial material enhancing task compliance, and to use identification tasks targeting epiphonological processes as well as manipulation tasks targeting metaphonological processes. At first grade, the same children were given spelling and reading tests in order to determinate the predictif characteristic of this battery. This article briefly presents normative data of the most predictive and discerning tasks of future success in reading and spelling acquisition. [less ▲]

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See detailGd(III)-DOTA conjugate with furtive targeting copolymer poly(AMPEO-co-HEA) by click chemistry for magnetic resonance imaging
Grogna, Mathurin ULg; Bémelmans, Stéphanie; Vanasschen, Christian et al

Poster (2008, May 22)

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See detailSuperhydrophobic surfaces by electrospinning of polymer mixtures
Grignard, Bruno ULg; Vaillant, Alexandre; De Coninck, Joel et al

Poster (2008, May 22)

Hydrophobic surfaces have found great interest in environment resist coating, antifouling marine structures and low friction devices whereas superhydrophobic materials, with contact angle higher than 150° ... [more ▼]

Hydrophobic surfaces have found great interest in environment resist coating, antifouling marine structures and low friction devices whereas superhydrophobic materials, with contact angle higher than 150°, are of special interest in self-cleaning surfaces and stain resistant textiles. (Super)hydrophobicity is a key property that depends on both the surface chemistry and surface roughness. Numerous methods were reported for the preparation of superhydrophobic surfaces by either increasing the surface roughness of an inherently hydrophobic material or decreasing the surface free energy of a rough surface by post-treatment. For instance, controlled crystallization, lithography , etching were reported in the literature for the production of such surfaces. Nevertheless, all these techniques suffer from some drawback such as high cost, time consuming and expensive processes. As an alternative approach, electrospinning was proposed for the production of superhydrophobic surfaces with controlled roughness, morphology and/or porosity. For instance, Acatay et Al. reported on the preparation of electrospun fibers starting from a poly(AN-co-TMI)/fluorolink-D mixture followed by the annealing of these material in order to enable the reorientation of the perfluorinated groups to the solid-air interface. Rutledge et al. described the preparation of superhydrophobic surfaces by combining electrospinning of PCL and initiated chemical vapor deposition of perfluoroalkyl ethyl methacrylate. Allcock et al. prepared superhydrophibic nanofibers by electrospinning of an organic-soluble poly[bis(2,2,2-trifluoroethoxy)phosphazene]. In order to simplify the experimental protocols described in the literature on the preparation of superhydrophobic surfaces and decrease the cost related to the use of pure fluoropolymers, electrospinning of homopolymer/semifluorinated diblock copolymer mixture, i.e. a polyisobornylacrylate/poly(isobornyl acrylate-b-heptadecafluorodecyl acrylate) mixture, onto aluminum plates is proposed in this study. In practice, a diblock copolymer based on 1H,1H,2H,2H heptadecafluorodecyl acrylate and isobornyl acrylate was prepared by RAFT polymerization. In a second step, electrospinning of PIBA/PAC8-b-PIBA mixtures of different compositions was investigated. At high fluorine content ([PIBA]/[PAC8-b-PIBA] = 50/50), the electrospun mats show high surface roughness (microparticles of undefined morphologies) and a superhydrophic character. By decreasing the fluorine content, the morphology of the films changed from particles to beaded fibers (([PIBA]/[PAC8-b-PIBA] = 70/30) or fibers (([PIBA]/[PAC8-b-PIBA] = 85/15), which is consistent with an increase of the solution viscosity, but the surfaces still demonstrate or tend to superhydrophobicity. [less ▲]

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See detailNovel biodegradable pH-sensitive flower micelle
Cajot, Sébastien ULg; Van Butsele, Kathy; Jérôme, Christine ULg

Poster (2008, May 22)

Detailed reference viewed: 50 (12 ULg)
See detailKey role of metal-coordination in cobalt mediated radical polymerization
Debuigne, Antoine ULg; Poli, Rinaldo; Jérôme, Christine ULg et al

Poster (2008, May 22)

Detailed reference viewed: 7 (1 ULg)
See detailPolyolefin matrixes with permanent antibacterial activity: preparation, antibacterial activity, and action mode of the active species
Lenoir, Sandrine; Pagnoulle, Christophe; Galleni, Moreno ULg et al

Poster (2008, May 22)

Detailed reference viewed: 41 (12 ULg)
Peer Reviewed
See detailCognition in Chronic Fatigue Syndrome as compared with major depression
Gillain, B.; Adam, Stéphane ULg; Seron, Xavier et al

Poster (2008, May 21)

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See detailAxions & Polarisation of Quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

Poster (2008, May 21)

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See detailStudy of neuronal cells preconditioning by ESR
Guelluy, Pierre-Henri ULg; Deby-Dupont; Hoebeke, Maryse ULg

Poster (2008, May 16)

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See detailSyntheses of well-defined PLA and PLA-PEO-PLA copolymers from PEO block
Köttgen, Cindy; Grandfils, Christian ULg

Poster (2008, May 16)

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See detailAltération des traitements séquentiels chez les enfants dysphasiques
Gabriel, Audrey ULg; Maillart, Christelle ULg; Meulemans, Thierry ULg

Poster (2008, May 15)

Contexte : Peu de travaux ont été consacrés au développement des habiletés non linguistiques des enfants dysphasiques. Ce constat est paradoxal car des études montrent que les enfants porteurs de troubles ... [more ▼]

Contexte : Peu de travaux ont été consacrés au développement des habiletés non linguistiques des enfants dysphasiques. Ce constat est paradoxal car des études montrent que les enfants porteurs de troubles dits « spécifiques » présentent d’autres troubles non langagiers associés, notamment des troubles séquentiels (Ellis Weismer et al., 2005). D’un point de vue clinique, le pronostic concernant leur évolution semblerait parfois plus lié aux résultats obtenus aux épreuves non linguistiques (particulièrement celles impliquant un traitement séquentiel) qu’à la sévérité du déficit langagier ou à des caractéristiques langagières précises. Objectifs : Ce projet vise une meilleure compréhension de l’implication des traitements séquentiels dans l’origine de cette pathologie à des fins d’éclaircissement de l’étiologie et d’optimisation de prise en charge de ces patients, parfois très hétérogènes. Méthodologie : Apprentissage d’informations séquentielles et simultanées présentées visuellement et évaluation de son maintien auprès d’enfants dysphasiques âgés entre 6 et 12 ans, appariés à des sujets contrôles au niveau de l’âge chronologique et du QIP. Résultats : les résultats seront discutés ultérieurement. Toutefois, nous émettons l’hypothèse que les enfants dysphasiques obtiendraient des performances en dessous de la moyenne des enfants de même âge chronologique à toutes les épreuves faisant appel à un traitement séquentiel, contrairement aux épreuves faisant appel au traitement simultané. Conclusion : Les tâches qui requerraient un traitement séquentiel seraient altérées chez les enfants dysphasiques. Ceci n’a rien de surprenant étant donné que le langage est lui-même une activité séquentielle dans laquelle le mot constitue un ordre défini de phonèmes (Keele et al., 2003). [less ▲]

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See detailExophthalmos and strabismus associated with a frontal mucocele in a 6-month-old puppy
Monclin, Sébastien ULg; Saulnier-Troff F.; Bolen, Géraldine ULg et al

Poster (2008, May)

Detailed reference viewed: 27 (10 ULg)
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See detailBrain responses following sleep loss are predicted by a polymorphism in PERIOD3 as assessed in humans using fMRI
Vandewalle, Gilles ULg; Archer, Simon N; Wuillaume, Catherine et al

Poster (2008, May)

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See detailA drop of spectroscopy
Terwagne, Denis ULg; Gilet, Tristan ULg; Vandewalle, Nicolas ULg et al

Poster (2008, May)

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See detailInvestigation of methane production in Tunisian MSW landfills
Hiligsmann, Serge ULg; Mhiri, F.; Belaid, S. et al

Poster (2008, May)

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See detailReducing human salmonellosis in Belgium from minced pork meat with quantitative risk assessment scenarios
Delhalle, Laurent ULg; Bollaerts, K.; Messens, W. et al

Poster (2008, May)

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See detailA drop of spectroscopy
Terwagne, Denis ULg; Gilet, Tristan ULg; Vandewalle, Nicolas ULg et al

Poster (2008, May)

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See detailArchitecture of a Grid-Enabled Lattice-Boltzmann Middleware
Dethier, Gérard ULg; Marchot, Pierre ULg; de Marneffe, Pierre-Arnoul ULg

Poster (2008, May)

Lattice-Boltzmann (LB) simulation methods constitute a family of computational fluid dynamics methods that can deal with complex multiphysics models and are easily parallelizable. They are based on ... [more ▼]

Lattice-Boltzmann (LB) simulation methods constitute a family of computational fluid dynamics methods that can deal with complex multiphysics models and are easily parallelizable. They are based on modified lattice-gas automata. The algorithm of LB simulations is quite simple. Space is discretized into a lattice. Each node of this lattice has a state. This state indicates the proportion of particules moving along fixed directions (these proportions are generally called “fields”). At each time step, the state of all lattice nodes is updated. Each node first receives fields coming from its neighbors and then “collides” them by applying a collision operator which generates the new state. Grid computing can be defined as “coordinated resource sharing and problem solving in dynamic, multi-institutional collaborations”. In practice, a Grid user (which can be a software component) submits a job composed of tasks to the Grid. The tasks are automatically run on available computational resources across organizational boundaries (i.e. clusters of multiple departments). LaBoGrid is an application combining the concepts of LB modelling and Grid computing. It is able to run LB simulations on an arbitrary number of computational resources from a Grid. It deals with operating system and hardware performance heterogeneity. The former because LaBoGrid is written in Java. The latter thanks to load-balancing. This is essential because all LaBoGrid tasks are inter- connected and depend on information from one another. A slow LaBoGrid task will slow down the overall process. LaBoGrid is based on asynchronous agents exchanging messages. The two main agents are the Controller agent (CA) and the distributed agent (DA). In a deployed LaBoGrid system, the CA exists in only one instance. It keeps track of the DAs and their topology. A task agent running some arbitrary code can be attached to the CA (CAT) and the DAs (DAT). In LaBoGrid, LB-specialized task agents are used (this system could be adapted to other problems). A configuration file parsed by the LB CAT gives the parameters of an LB simulation. The LB CAT configures automatically the LB DATs which handle the simulation code. Currently, LB simulations are done on 3D fluids with 19 fields per state. However, the code can be adapted very easily to other fluid dimensions and different state definitions, storage and computation precisions and collision types. [less ▲]

Detailed reference viewed: 105 (14 ULg)
See detailThe XMM-Newton view of the rich cluster Cyg OB2
Rauw, Grégor ULg; De Becker, Michaël ULg; Nazé, Yaël ULg et al

Poster (2008, May)

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See detailFalse memory and surprise: round #3
Willems, Sylvie ULg; Dehon, Hedwige ULg

Poster (2008, May)

Three experiments examined the links between surprise feeling and a false memory phenomenon, the Deese-Roediger-McDermott (DRM) effect. In DRM paradigm, subjects studied lists of related words (NIGHT ... [more ▼]

Three experiments examined the links between surprise feeling and a false memory phenomenon, the Deese-Roediger-McDermott (DRM) effect. In DRM paradigm, subjects studied lists of related words (NIGHT, DREAM, etc.) that were associated with non-presented critical word (e.g., SLEEP) for which high false recognition rate is after noted. Roediger and coll. (in press) suggested that this effect occur because critical words are highly activated by their semantic association with words that are in the list. Whittlesea et al. (2005) proposed an alternative explanation, based on the discrepancy-attribution hypothesis. According to that account, false recognition results when a feeling of surprise comes from a discrepancy between subject’s expectation about processing fluency and real processing fluency. When Whittlesea and coll. have provided a range of evidences for this account, Roediger and coll. found that subjects were not surprised when they encountered non-presented critical word during recognition test. We explained these discrepant findings by methodology differences between these two studies. Whittlesea et al. noted that various procedures that eliminate surprise eliminate the false memories. However, they used a modified DRM procedure (e.g., RSVP presentations and recognition judgment for each critical word directly after the study of each list of related words). In contrast, Roediger and coll. used a classical DRM procedure but did not eliminate surprise feeling. Rather, they investigated whether subjects experienced the critical word as surprising by asking them to make judgments of surprise on a recognition test. In this study, we used various procedures that eliminate surprise like Whittlesea but we used classical DRM paradigm like Roediger. Experiment 1 replicates the DRM effect. Experiment 2 & 3 shows that the DRM effect is decreased but not abolished when participants are prevented from being surprised by critical word. It is proposed that experience of surprise participate to DRM effect, but not alone. [less ▲]

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See detailThe Mere Exposure Effects Depends on the Way You Look!
Willems, Sylvie ULg; Dedonder, Jonathan

Poster (2008, May)

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See detailFalse memories and Surprise: Round #3
Willems, Sylvie ULg; Dehon, Hedwige ULg

Poster (2008, May)

Three experiments examined the links between feeling of surprise and a false memory phenomenon, the Deese-Roediger-McDermott (DRM) effect. In DRM paradigm, subjects studied lists of related words (NIGHT ... [more ▼]

Three experiments examined the links between feeling of surprise and a false memory phenomenon, the Deese-Roediger-McDermott (DRM) effect. In DRM paradigm, subjects studied lists of related words (NIGHT, DREAM, etc.) that were associated with non-presented critical word (e.g., SLEEP) for which high false recognition rate is after noted. Whittlesea et al. (2005) proposed that false recognition results when a feeling of surprise comes from a discrepancy between subject’s expectation about processing fluency and real processing fluency. When Whittlesea and coll. have provided a range of evidences for this account, Roediger and coll. (in press) found that subjects were not surprised when they encountered non-presented critical word during recognition test. We explained these discrepant findings by methodology differences between these two studies. Whittlesea et al. noted that various procedures that eliminate surprise eliminate the false memories. However, they used a modified DRM procedure (e.g., RSVP presentations). In contrast, Roediger and coll. used a classical DRM procedure but did not eliminate surprise feeling. Rather, they investigated whether subjects experienced the critical word as surprising by asking them to make judgments of surprise on a recognition test. In this study, we used various procedures that eliminate surprise like Whittlesea but we used classical DRM paradigm like Roediger. Experiment 1 replicates the DRM effect. Experiment 2 & 3 shows that the DRM effect is decreased but not abolished when participants are prevented from being surprised by critical word. It is proposed that experience of surprise participate to DRM effect, but not alone. [less ▲]

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See detailCerebral correlates of false memories and illusory recollection after sleep and sleep deprivation.
Darsaud, A.; Dehon, Hedwige ULg; et al.

Poster (2008, May)

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See detailL’Inventaire Systémique de Qualité de Vie pour Enfants (ISQV-E©) : Etude de validation
Missotten, Pierre ULg; Lemétayer, Fabienne; Spitz, Elisabeth et al

Poster (2008, May)

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See detail6-Substituted benzopyran derivatives as potent KATP channel openers: synthesis and biological in vitro evaluation
Florence, X.; De Tullio, Pascal ULg; Lebrun, P. et al

Poster (2008, May)

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See detailTime Reversal of Atomic Matter Waves
Martin, John ULg; Georgeot, Bertrand; Shepelyansky

Poster (2008, May)

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See detailNew results on the UV Io footprint morphology and brightness
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Poster (2008, April 18)

The Io UV footprint is an auroral feature on Jupiter caused by the electromagnetic interaction between the satellite Io and the Jovian magnetosphere. The footprint morphology and the spots multiplicity ... [more ▼]

The Io UV footprint is an auroral feature on Jupiter caused by the electromagnetic interaction between the satellite Io and the Jovian magnetosphere. The footprint morphology and the spots multiplicity have been found to vary with the location of Io in the plasma torus. We show recent Hubble Space Telescope (HST) images that reveal a new feature in the footprint: a faint leading spot that appears upstream of the main spot in one hemisphere when Io is close to the opposite border of the torus. A possible interpretation relates the leading spots and one downward secondary spot to electron beams generated by downstream currents in the opposite hemisphere. We also present a 3D model of the Io footprint emissions in the 100 to 170 nm wavelength range. Comparisons between this model and the HST images enable us to study the actual size and shape of the different Io footprint features. It also allows to measure the footprint brightness on the new images with a better estimation of the geometric effects (e.g. limb brightening). The observations presented here provide critical constraints to the Io-plasma torus interaction modeling. [less ▲]

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See detailFunctional Development of Advanced Driver Assistance Systems by means of Driving Simulators
Christen, Fréderic ULg; Benmimoun, A.; Deutschle, S.

Poster (2008, April 16)

Der Beitrag beschreibt die Funktionsentwicklung von Fahrerassistenzsystemen an der Forschungsgesellschaft Kraftfahrwesen mbH Aachen (fka) und am Institut für Kraftfahrwesen (ika) der RWTH Aachen mittels ... [more ▼]

Der Beitrag beschreibt die Funktionsentwicklung von Fahrerassistenzsystemen an der Forschungsgesellschaft Kraftfahrwesen mbH Aachen (fka) und am Institut für Kraftfahrwesen (ika) der RWTH Aachen mittels Fahrsimulatoren. Dabei wird konkret auf die Entwicklung eines Kreuzungsassistenten sowie eines sogenannten KONVOI-Systems eingegangen. Beide Systeme wurden u.a. unter Verwendung des statischen Fahrsimulators InDriveS entwickelt. Der in diesem Beitrag vorgestellte Ansatz eines Kreuzungsassistenten basiert auf Kommunikation: Fahrzeug-Fahrzeug-Kommunikation (C2C) und Infrastruktur-Fahrzeug- Kommunikation (I2C). Hierfür wurden in der Verkehrsfluss- und Fahrsimulation verschiedene Systemvarianten betrachtet, um unterschiedliche Stufen der Systemkomplexität und unter- schiedliche Zeitrahmen für die Realisierung eines solchen Assistenten zu berücksichtigen. Jede dieser Systemvarianten wurde hinsichtlich deren Wirkung auf die Verkehrssicherheit bewertet. Daneben wurde auch die Benutzerakzeptanz unter Berücksichtigung verschiedener Mensch-Maschine-Schnittstellen betrachtet. Die Ergebnisse zeigen, dass die Kommunikationsreichweite der wichtigste Parameter für die Systemauslegung und -spezifikation darstellt. Für die Wirkung des Kreuzungsassistenten auf die Verkehrssicherheit ist in erster Linie der Ausrüstungsgrad entscheidend. Für die Benutzerakzeptanz ist die Detektionsrate von möglichen Konfliktsituationen und die Vermeidung von kritischen Situationen entscheidend. Das dargestellte KONVOI-System ermöglicht die Automatisierung von Nutzfahrzeugkolonnen auf Autobahnen. Neben der Funktionsentwicklung zur automatischen Abstandsregelung und Querführung werden in dem Projekt die Auswirkungen von KONVOIs auf den übrigen Verkehr analysiert und die bei den Fahrern auftretenden Belastungen und die Akzeptanz des Systems untersucht. Begleitend werden rechtliche Aspekte der kommerziellen Nutzung von Lkw-KONVOIs in Deutschland weiterentwickelt. Um die Komplexität der zu entwickelnden Lösungen zur Funktionserweiterung der Fahrzeuge zu bewältigen und eine hohe Zuverlässigkeit der Systeme zu gewährleisten, erfolgt die Systementwicklung mit Hilfe von Simulationswerkzeugen (MATLAB/Simulink, Stateflow, Verkehrsflusssimulation PELOPS und Lkw- Fahrsimulator InDriveS). Abschließend geht der Beitrag auf den neuen dynamischen Fahrsimulator der RWTH Aachen ein. [less ▲]

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See detailNew pH-sensitive flower micelles for potential tumour targeting
Cajot, Sébastien ULg; Van Butsele, Kathy; Jérôme, Christine ULg

Poster (2008, April 16)

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See detailA record negative Greenland ice sheet surface mass balance rate in 2007
Fettweis, Xavier ULg

Poster (2008, April 15)

Results made with the regional climate model MAR show a record surface melt (592 km³/yr = a global sea level rise of 1.6 mm/yr) of the Greenland ice sheet (GrIS) during summer 2007 compared with 1970-2006 ... [more ▼]

Results made with the regional climate model MAR show a record surface melt (592 km³/yr = a global sea level rise of 1.6 mm/yr) of the Greenland ice sheet (GrIS) during summer 2007 compared with 1970-2006. This record melt, detected also in the microwave satellite data, is associated with very low snowfall (508 km³/yr) inducing a negative Surface Mass Balance (SMB) rate of -65 km³/yr. Such a negative simulated SMB rate is unprecedented in the recent Greenland history. The summer 2007 is associated with a positive SST anomaly, a negative 2006-2007 GrIS winter accumulation and anomalous advection of warm air masses over the GrIS. Sensitivity experiments carried out by the MAR model evaluate the impacts of these anomalies on the Greenland climate and SMB. The main impacts of a warmer SST anomaly in the MAR model are more precipitation over Greenland due to an enhanced evaporation above the ocean and, an increase of surface melt induced by the advection of warmer oceanic air (>0°C) into the continent by the atmospheric part of MAR. A negative winter accumulation anomaly exposes ice and old snow (with a lower albedo) earlier than previous years in the ablation zone which significantly increases the melting given the albedo feedback. Finally, changes in the boundaries forcing of the MAR model test the consequence of the anomalous persistent southerly airflow during June and July. [less ▲]

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See detailImpacts of ice sheet mask and resolution on estimating the surface mass balance of the Greenland ice sheet
Fettweis, Xavier ULg

Poster (2008, April 15)

The impacts of the spatial resolution and a Greenland ice sheet (GrIS) mask on modelling the Surface Mass Balance (SMB) are studied with the regional climate model MAR coupled with a complex energy ... [more ▼]

The impacts of the spatial resolution and a Greenland ice sheet (GrIS) mask on modelling the Surface Mass Balance (SMB) are studied with the regional climate model MAR coupled with a complex energy balance/snowpack model. On the one hand, too coarse resolution prevents the model from resolving adequately the steep ice sheet margin and the ablation zone, not wider than 100 km in Greenland, where substantial seasonal melting occurs. The resolution affects also the precipitation modelling. On the other hand, a too large ice sheet mask (i.e. with low-altitude ice pixels in the model, where there is no ice in reality) leads to an overestimation of the run-off. In addition, due to the albedo feedback, biases in the ice sheet mask have also consequences on the surface energy balance. [less ▲]

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See detailThree-dimensional analysis of oceanographic data with the software DIVA
Troupin, Charles ULg; Ouberdous, Mohamed ULg; Machín, Francisco et al

Poster (2008, April 13)

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See detailScreening for chronic kidney disease and other associated risk factors in rural congolese oil company in the Democratic Republic of Congo (DRC).
Sumaili, Ernest; Zinga, Chantal; Nseka, Nazaire et al

Poster (2008, April 10)

This study indicates that CKD and traditional risk factors for CKD are very prevalent in this rural Oil Company. Screenings for these conditions are thus imperative to put high on the health agenda ... [more ▼]

This study indicates that CKD and traditional risk factors for CKD are very prevalent in this rural Oil Company. Screenings for these conditions are thus imperative to put high on the health agenda. Additional studies are needed of the causes of CKD in this company and probably in other areas of the DRC. [less ▲]

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See detailDIVA-4.2.1: presentation of the new features
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Poster (2008, April 03)

Detailed reference viewed: 14 (0 ULg)
See detailDiversité moléculaire des cyanobactéries planctonniques dans les eaux de surface belges
Lara, Yannick ULg; Lambion, Alexandre ULg; Simon, Patricia ULg et al

Poster (2008, April 02)

Les développements massifs de cyanobactéries ou ‘blooms’ sont devenus un phénomène récurrent et de plus en plus important dans les eaux douces du monde entier durant la dernière décennie. Ces ... [more ▼]

Les développements massifs de cyanobactéries ou ‘blooms’ sont devenus un phénomène récurrent et de plus en plus important dans les eaux douces du monde entier durant la dernière décennie. Ces efflorescences présentent des risques potentiels majeurs pour la santé humaine et animale et interfèrent négativement avec l'utilisation des eaux de surface par exemple, pour le captage d'eau potable, les loisirs nautiques, l'irrigation, les exploitations piscicoles. Entre 25 et 70% des blooms sont toxiques. Comme beaucoup de pays la Belgique n'a pas échappé au problème des efflorescences de cyanobactéries toxiques, mais il y a encore relativement peu de données. Durant la dernière décennie, trois projets européens et nationaux (MIDICHIP 1999-2003, B-BLOOMS 2003-2005, B-BLOOMS 2 2007-2011) se sont intéressés à la diversité des cyanobactéries dans les eaux de surfaces belges. Nous présentons ici un arbre phylogénétique élaboré à partir d’ un pool de 249 séquences partielles du gène codant pour l’ARNr 16S obtenu à partir de 31 échantillons d’eaux belges issus de ces projets. Cet arbre représente la mise à jour d’une base de données qui constitue l’inventaire des cyanobactéries d’eaux douces belges. Cette base de données permet le suivi de l’évolution de la diversité observable de ces organismes en Belgique et la surveillance de l’apparition d’espèces tropicales comme conséquence aux changements climatiques globaux. [less ▲]

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See detailAutomatic 1958-2007 daily weather pattern classification applied to an analysis of climatic conditions of wildfires in eastern Belgium
Erpicum, Michel ULg; Fettweis, Xavier ULg; Mabille, Georges ULg et al

Poster (2008, April)

The daily atmospheric circulation patterns classification is founded on a 100 km regular grid centred on Belgium. The geopotential heights of 500, 850 and 1000 hPa levels were extracted <br />from the ERA ... [more ▼]

The daily atmospheric circulation patterns classification is founded on a 100 km regular grid centred on Belgium. The geopotential heights of 500, 850 and 1000 hPa levels were extracted <br />from the ERA-40 database on the period 1958-2002 and from ECMWF operational analysis until the end of year 2007. The classification was based on a similarity index calculated on the orientation of exaggerated slopes of different daily geopotential fields. Wildfire occurrences were analyzed in April and September (which are the two months with the most frequent wildfire-days in Belgium) together with monthly frequencies and persistences of daily atmospheric circulation pattern classes as well as with yearly variability of weather climate conditions. [less ▲]

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See detailStudy of the acid hydrolysis of pectin extracted from sugar beet pulp
Valepyn, Emmanuel ULg; Robert, Christelle; Paquot, Michel ULg

Poster (2008, April)

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See detailCarbon dioxide dynamics in lake Kivu during the dry and wet seasons
Borges, Alberto ULg; Delille, Bruno ULg; Descy, J.-P. et al

Poster (2008, April)

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See detailImpact of cristallinity index on the stability and physical properties of inulin during moisture uptake.
Ronkart, Sébastien; Paquot, Michel ULg; Fougnies, C. et al

Poster (2008, April)

Detailed reference viewed: 11 (2 ULg)
See detailAnalyse bioinformatique de différents marqueurs génétiques pour la caractérisation taxonomique et génotypique des algues bleues.
Lara, Yannick ULg; Wilmotte, Annick ULg

Poster (2008, April)

Les cyanobactéries (ou algues bleues) sont des organismes procaryotes photosynthétiques considérés comme les ancêtres des plastes des végétaux eucaryotes. Présentes dans différents types d’habitats ... [more ▼]

Les cyanobactéries (ou algues bleues) sont des organismes procaryotes photosynthétiques considérés comme les ancêtres des plastes des végétaux eucaryotes. Présentes dans différents types d’habitats terrestres ou aquatiques, elles peuvent produire des composés bioactifs d’intérêt pour des industries pharmaceutiques, ou encore des toxines présentant un risque potentiel pour la santé humaine et animale. Il est donc important de pouvoir caractériser différentes espèces et différents génotypes de ces organismes de manière indubitable pour pouvoir détecter leur présence/absence, évaluer leur rôle au sein de leur écosystème, ainsi que l’influence des facteurs environnementaux sur leur cycle de vie. La caractérisation taxonomique des cyanobactéries a longtemps été réalisée par l’étude des critères morphologiques. Cependant cette approche s’avère délicate quand ces critères peuvent être altérés par la mise en culture. De plus, cette approche requiert une expérience importante et ne permet pas de différencier des génotypes toxiques. La séquence du gène codant pour l’ARN ribosomique 16S est utilisée pour différencier les cyanobactéries jusqu’au genre et parfois jusqu’à l’espèce. Mais, dans certains cas, elle ne coïncide ni avec la description morphologique spécifique, ni avec la production de certaines toxines. Dans le cadre de cette étude, nous proposons d’évaluer l’information taxonomique et génotypique de marqueurs génétiques singuliers présents dans les génomes de cyanobactéries séquencés d la base de données Genbank. Les distances génétiques entre les parties de 32 génomes suffisamment conservées pour être alignées ont été mesurées. Ces distances ont ensuite été comparées par régression linéaire aux distances génétiques de différents loci précis (ARNr 16S, kaiC, lexA, rpoC1, recA). Les résultats préliminaires montrent un R2 de 0,9141 pour la régression linéaire entre les distances génétiques du gène recA et des régions conservées des génomes séquencés appartenant au genre Prochlorococcus. Ce résultat suggère que recA serait potentiellement un bon marqueur pour génotyper des organismes du genre Prochlorococcus. [less ▲]

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See detailCarbonyl fluoride (COF2) vertical information above Jungfraujoch by FTIR and multi-spectra fitting: error budget and comparisons with KASIMA 3-D CTM model calculations
Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg; Ruhnke, Roland et al

Poster (2008, April)

The major sources of fluorine in the stratosphere are CFC-11 and CFC-12. During the decomposition process, fluorine is first present in the form of carbonyl compounds (e.g. carbonyl fluoride (COF2 ... [more ▼]

The major sources of fluorine in the stratosphere are CFC-11 and CFC-12. During the decomposition process, fluorine is first present in the form of carbonyl compounds (e.g. carbonyl fluoride (COF2)). Given its long life time, COF2 is the second most abundant stratospheric fluorine reservoir. Earliest, COF2 vertical distributions were derived from occultation measurements performed by the ATMOS instrument during the SPACELAB-3 Space Shuttle mission in 1985. The Canadian FTIR spectrometer ACE-FTS, onboard the SCISAT-1 satellite, is the first instrument since the last ATMOS flight in 1994, to record COF2 vertical profiles from space. Four years of ACE-FTS occultation measurements are presently available. Several COF2 IR absorption lines located either in the so-called InSb (1-5 µm) and MCT (2-16 µm) spectral ranges can be used to determine its total column from ground-based high-resolution FTIR observations. In addition, we have proposed, during the EGU General Assembly 2007, an original retrieval procedure that allows us to derive information on the COF2 vertical distribution, between 17 and 30 km, from ground-based FTIR spectra recorded at Jungfraujoch. This “multi-microwindows multi-spectra” approach, using the SFIT-2 v3.91 algorithm, has been completely characterized in terms of fitting strategy and information content. Some examples of COF2 vertical profiles inversions were also presented. This year, we will complete the characterization of the multi-microwindows multi-spectra fitting procedure by exposing the full error budget affecting our COF2 partial and total columns products. Also, comparisons with COF2 model runs generated by the 3D CTM KASIMA (KArlsruhe SImulation model of the Middle Atmosphere) will be presented and critically discussed. [less ▲]

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See detailObservations of halogens, CO, CH4, and H2CO at Ile de La Réunion from ground-based FTIR and MAXDOAS campaign measurements
De Mazière, Martine; Vigouroux, Corinne; Hendrick, François et al

Poster (2008, April)

Ile de La Réunion is a complementary site in the Network for the Detection of Atmospheric Composition Change (NDACC), situated in the southern tropics, at 21°S, 55°E. In support of a better understanding ... [more ▼]

Ile de La Réunion is a complementary site in the Network for the Detection of Atmospheric Composition Change (NDACC), situated in the southern tropics, at 21°S, 55°E. In support of a better understanding of atmospheric chemistry and physics above tropical regions, we have implemented new ground-based MAX-DOAS (multi-axis DOAS) and FTIR (Fourier transform infrared) observations at this site, on a campaign basis since 2002. At present, we have data from 2002 (month of October), 2004 (August to October) and 2007 (end of May until the end of October). Additional campaigns are planned until the availability of a new infrastructure for permanent observations at the Maido (~ 2000 masl), around 2010. Here, we report on the available time series for a number of tropospheric species (CO, H2CO and CH4,) and stratospheric halogen species, comparisons between MAX-DOAS and FTIR data of H2CO, and comparisons of ground-based and satellite data. [less ▲]

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