References of "Scientific congresses and symposiums"
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See detailAnalyse des incidents médicamenteux au CHU de Liège
Bottari, Ludovic; Maesen, Didier ULg; Van Hees, Thierry ULg

Conference (2009, April 28)

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See detailA new mechanism of upwelling generated filaments based on potential vorticity balance
Troupin, Charles ULg; Mason, Evan; Beckers, Jean-Marie ULg et al

Conference (2009, April 27)

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See detailDetection and characterization of tilted peptides in amyloid proteins
Crowet, Jean-Marc ULg; Lins, Laurence ULg; Brasseur, Robert ULg

Poster (2009, April 25)

The study of amyloidogenic proteins is of interest in biochemistry because these proteins undergo conformational changes and aggregation. Both processes are largely implicated in several diseases ... [more ▼]

The study of amyloidogenic proteins is of interest in biochemistry because these proteins undergo conformational changes and aggregation. Both processes are largely implicated in several diseases including Alzheimer’s, Parkinson’s or Creutzfeldt-Jakob’s disease. These phenomena are not completely understood, either at a structural or energetical point of view. Tilted peptides are short protein fragment (11 to 19 residues) that adopt a tilted orientation when inserted into biological membranes and destabilise them. Recently, tilted peptides have been detected in two amyloidogenic proteins involved in neurodegenerative diseases; the amyloid  peptide responsible for Alzheimer’s disease, and the PrP protein that causes Creutzfeldt-Jakob’s disease. Tilted peptides could be responsible for the neurotoxic effects of these proteins. Due to their destabilising properties, they could interact directly with the membrane leading to cell death. Tilted peptides could also be involved in the transconformational process of the proteins. The aim of this work is to detect tilted fragments in other amyloidogenic proteins by molecular modelling and to study some of these peptides experimentally to evidence their lipid destabilizing properties, their structure and their toxicity. Twenty-four tilted peptides from 18 different proteins have been detected among 53 amyloidogenic proteins and 7 peptides were tested experimentally. The results support the hypothesis that some tilted peptides could be involved in transconformational processes and/or cytotoxicity related to amyloidogenic proteins. [less ▲]

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See detailLa construction d'une identité jésuite : le corps et la mémoire
Delfosse, Annick ULg

Conference (2009, April 24)

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See detailNovel (co)polymers by cobalt-mediated radical polymerization
Debuigne, Antoine ULg; Piette, Yasmine ULg; Poli, Rinaldo et al

Poster (2009, April 24)

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See detailThe 1958-2008 Greenland ice sheet surface mass balance variability simulated by the regional climate model MAR
Fettweis, Xavier ULg

Poster (2009, April 24)

Results made with the regional climate model MAR over 1958-2008 show a very high interannual variability of the Greenland ice sheet (GrIS) surface mass balance (SMB) modelled in average to be 330 +/- 130 ... [more ▼]

Results made with the regional climate model MAR over 1958-2008 show a very high interannual variability of the Greenland ice sheet (GrIS) surface mass balance (SMB) modelled in average to be 330 +/- 130 km^3/yr. To a first approximation, the SMB variability is driven by the annual precipitation anomaly minus the meltwater run-off rate variability. Sensitivity experiments carried out by the MAR model evaluate the impacts on the surface melt of (i) the summer SST around the Greenland, (ii) the snow pack temperature at the beginning of the spring, (iii) the winter snow accumulation, (iv) the solid and liquid summer precipitations and (v) the summer atmospheric circulation. This last one, by forcing the summer air temperature above the ice sheet, explains mainly the surface melt anomalies. [less ▲]

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See detail3D modelling of the Black Sea ecosystem
Capet, Arthur ULg; Beckers, Jean-Marie ULg; Joassin, Pascal et al

Poster (2009, April 24)

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See detailTransferring a calibration model and a spectral library to a soil analysis laboratories network
Genot, Valérie ULg; Colinet, Gilles ULg; Dardenne, Pierre et al

in EGU 2009 Book of abstracts (2009, April 23)

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See detailDiscours critiques face au modèle dominant dans les sciences de la gestion
Robert, Jocelyne ULg

Conference (2009, April 23)

Detailed reference viewed: 39 (22 ULg)
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See detailComparison of transport in lysimeters with undisturbed loamy sand and silty soil using non invasive imaging with electrical resistivity tomography.
Garré, Sarah ULg; Koestel, Johannes; Vanderborght, Jan et al

in Geophysical Research Abstracts (2009, April 23)

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See detailThe 1958-2008 Greenland ice sheet surface melt and the mid-tropospheric atmospheric circulation
Fettweis, Xavier ULg

Conference (2009, April 23)

With the aim to study the impact of the mid-tropospheric circulation on the Greenland ice sheet (GrIS) surface melt simulated by the regional climate model MAR, we developed an automatic Circulation Type ... [more ▼]

With the aim to study the impact of the mid-tropospheric circulation on the Greenland ice sheet (GrIS) surface melt simulated by the regional climate model MAR, we developed an automatic Circulation Type Classification (CTC) based on the 500hPa geopotential height from reanalyses over the period 1958-2008. This CTC shows that the dominant mode of the regional atmospheric summer variability around the GrIS is linked to the North Atlantic Oscillation (NAO) and that the surface melt anomalies are highly correlated to the general circulation. It explains notably why a record surface melt was observed during the summers 2007 and 2008. In addition, the climate conditions occurring the 27th August of 2003, where the GrIS temperature was 10°C higher than the normal, were the consequence of an almost unique 500 hPa circulation in the 50 last years. [less ▲]

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See detailGround water flow simulation in mining works: Application of the Hybrid Finite Element Mixing Cell method
Wildemeersch, Samuel ULg; Orban, Philippe ULg; Brouyère, Serge ULg et al

Conference (2009, April 22)

Hydrogeological models can greatly help simulating groundwater flow in the particular context of mining works. However, classical modeling techniques are not so suited in this context because the medium ... [more ▼]

Hydrogeological models can greatly help simulating groundwater flow in the particular context of mining works. However, classical modeling techniques are not so suited in this context because the medium is strongly disturbed by shafts and networks of galleries. Consequently, specific modeling techniques have been developed. Box model techniques require only few parameters but they calculate only mean water levels in exploited zones and do not consider interactions between exploited and unexploited zones. Conversely, physically-based and spatially-distributed techniques represent explicitly both exploited and unexploited zones and take into account interactions between them but they require a lot of parameters sometimes difficult to estimate. The Hybrid Finite Element Mixing Cell (HFEMC) method is a new modeling technique constituting a compromise between simple and complex techniques used in mining context. The principle of this method is to fully couple a representation of exploited zones by a group of mixing cells possibly interconnected by pipes and a representation of unexploited zones by classical finite elements. Interactions between mixing cells and finite elements of the mesh are taken into account through 3rd type (Fourier) internal boundary conditions. With this method, exploited zones are characterized by mean water levels while spatially-distributed hydraulic heads are calculated for the entire adjacent and overlaying unexploited zones. Additionally, thanks to the coupling between mixing cells and finite elements, water exchanges between exploited and unexploited zones are explicitly taken into account. The HFEMC method allows also simulating groundwater rebound following mine closure and associated phenomena such as water inrushes. Concepts and equations of the HFEMC method are presented and illustrated using test cases. First results of an application on an abandoned coalfield in the region of Liege (Belgium) are also proposed. [less ▲]

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See detailThe location and topology of electron beams in Io‘s wake
Jacobsen, Sven; Saur, Joachim; Neubauer, Friz et al

Conference (2009, April 22)

The Galileo spacecraft measured hot field aligned electron beams near Io during three flybys. We apply our 3D MHD model of the Io-Jupiter interaction to constrain the location and shape of field aligned ... [more ▼]

The Galileo spacecraft measured hot field aligned electron beams near Io during three flybys. We apply our 3D MHD model of the Io-Jupiter interaction to constrain the location and shape of field aligned electron beams for the individual flyby scenarios. Io continuously generates MHD waves by disturbing the Jovian magnetoplasma. Currents carried by Alfvén waves propagate predominantly along the magnetic field lines. The waves accelerate electrons as the number of charge carriers decreases on their way to Jupiter. These energetic electrons precipitate into the Jovian ionosphere, visible as prominent Io footprint emission in the Jovian aurora. On the other hand electrons have to be accelerated upward to form the beams measured by Galileo. Unlike the beam formation, the position and spatial structure of these beams has been poorly discussed. We adopt our 3D MHD model initial conditions to the individual flyby scenario and determine the spatial morphol- ogy of beams in Io’s orbital plane. We compare our findings to Galileo observations and find very good agreement. Moreover, we use our model to further investigate in detail a recent concept which involves cross-hemisphere electron beams to explain certain auroral features of the Io footprint emission such as a leading spot and secondary spots [Bonfond et al., 2008]. Our results indicate that besides geometrical properties, such as Io’s position in the torus, the incoming plasma density controls the travel path and topology of an electron beam. [less ▲]

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See detailPrion: Biosafety Level 3-unconventional transmissible agent
Zorzi, Willy ULg; Elmoualij, Benaïssa ULg

Conference (2009, April 22)

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See detailHigh-resolution Climatology of the North-East Atlantic using Data-Interpolating Variational Analysis
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Conference (2009, April 21)

Detailed reference viewed: 28 (3 ULg)
See detailModelling uncertainties in the climate of the last millennium : The ASTER project
Loutre, M. F.; Mouchet, Anne ULg; Fichefet, T. et al

Poster (2009, April 21)

Detailed reference viewed: 8 (0 ULg)
See detailMiddle Miocene climate and vegetation modelling with PLASIM and CARAIB
Henrot, Alexandra ULg; François, Louis ULg; Favre, Eric ULg et al

Conference (2009, April 21)

In a long-term climatic cooling trend, the Middle Miocene represents one of the last warm periods of the Neogene, culminating with the Miocene Climatic Optimum, MCO (17-15 My). Palynological studies ... [more ▼]

In a long-term climatic cooling trend, the Middle Miocene represents one of the last warm periods of the Neogene, culminating with the Miocene Climatic Optimum, MCO (17-15 My). Palynological studies suggest that the warmer climatic conditions prevailing during the MCO allowed warm forests to expand poleward of the subtropical zone, with evergreen forests proliferating in North America and Europe (Jimenez-Moreno and Suc, 2007, Palaeogeogr. Palaeoclimatol. Palaeoecol. 253: 208-225). In this work, we used the Planet Simulator (Fraedrich et al., 2005, Meteorol. Z. 14: 299-304 and 305-314), an Earth system model of intermediate complexity, to carry out several simulation experiments, where we have assessed the effects of the absence of ice on the continents, the opening of the Central American and Eastern Tethys seaways, the lowering of the topography on land and the effect of various atmospheric CO2 concentrations, in agreement with the values reported in the litterature. We then produced several vegetation distributions, using the dynamic vegetation model CARAIB (Galy et al., 2008, Quat. Sci. Rev. 27: 1396-1409), to analyse if the climatic forcings considered are sufficient to explain the expansion of warmer forest types to higher latitudes. Our results indicate that an increase of atmospheric CO2 concentration, higher than the present-day one, is necessary to allow subtropical forest types to expand poleward. This result agrees with recent paleo-atmospheric CO2 reconstruction from stomatal frequency analysis, which suggests 500 ppmv of CO2 during the MCO. However, the required warming may be due to processes not considered in our setup (e.g. full oceanic circulation or other greenhouse gases). [less ▲]

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See detailEvolution of Western Mediterranean Sea Surface Temperature between 1985 and 2005
Troupin, Charles ULg; Lenartz, Fabian; Sirjacobs, Damien ULg et al

Conference (2009, April 20)

Detailed reference viewed: 34 (3 ULg)
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See detailInterannual variability of CO2 fluxes and yield by a winter wheat crop (Triticum aestivum L.)
Dufranne, Delphine ULg; Vancutsem, Françoise ULg; Moureaux, Christine ULg et al

Poster (2009, April 20)

In this study, two winter wheat (Triticum aestivum L.) cropping seasons were compared at the Lonzée (Belgium) experimental site. The site, crop management, sowing and harvest dates were similar on the two ... [more ▼]

In this study, two winter wheat (Triticum aestivum L.) cropping seasons were compared at the Lonzée (Belgium) experimental site. The site, crop management, sowing and harvest dates were similar on the two years. The main difference between the seasons was due to to climate conditions. Continuous eddy-covariance fluxes, leaf scale photosynthesis measurements and crop development monitoring were performed during the whole vegetation periods. Globally, the two years were characterised by a higher than normal air temperature (9.9 °C and 11.9 °C respectively against 9.4 °C for standard) and lower than normal rainfalls (595.1 mm and 675.1 mm respectively against 772 mm for standard). In addition, the second season (2006-2007) was characterised by an exceptionally mild winter, dry and hot conditions in April and by humid and cloudy conditions during the last vegetation phases. These particular conditions induced earlier growth stages and the comparison of global fluxes gives contrasting results: gross primary productivity (GPP) was larger in 2007 but, on the contrary, net primary productivity (NPP) and crop productivity were lower on this year. The bad yields could be explained, on one hand by the drought in April 2007 that induced abnormally small flag leaves, on the other hand by cloudy and humid conditions from end May to harvest, that induced an assimilation reduction due to low radiation and favoured disease development. The simultaneous higher GPP and lower NPP and productivity in 2006-2007 raise the question of carbon allocation. It suggests that the excess carbon assimilated in 2006-2007 was not stored in grain or straw and thus that it would have been stored in the roots or in vegetation parts that decompose before the harvest. Further biomass measurements (and especially root biomass) are necessary to confirm this hypothesis. [less ▲]

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See detailBiogeochemistry and carbon budget during a coccolithophorid bloom in the northern Bay of Biscay (June 2006)
Harlay, Jérôme ULg; Borges, Alberto ULg; De Bodt, Caroline et al

Poster (2009, April 19)

Carbon cycling processes (primary production (PPp), calcification (CAL), bacterial production and pelagic community respiration (PCR)) and variables (partial pressure of CO2 (pCO2) and total alkalinity ... [more ▼]

Carbon cycling processes (primary production (PPp), calcification (CAL), bacterial production and pelagic community respiration (PCR)) and variables (partial pressure of CO2 (pCO2) and total alkalinity (TA)) were measured in early June 2006 at several stations in the northern Bay of Biscay. These measurements were characterized with respect to the coccolithophorid blooming (growth or decline) based on satellite remote sensing (high reflectance (HR)) and other biogeochemical measurements i.e. inorganic nutrients, chlorophyll-a (Chl-a), phaeopigments (Phaeo), particulate inorganic carbon (PIC), particulate organic carbon (POC) and particulate nitrogen (PN)). The major HR patch was located over the shelf, along the continental margin and corresponded to declining bloom conditions characterized by moderate Chl-a <1.0 µg L-1, dissolved phosphate (PO4) depletion, low (<2.0 µmol L-1) dissolved silicate (DSi), low potential primary production (<0.25 µmol C L-1 h-1) and calcification rates (0.02-0.10 µmol C L-1 h-1). Yet, surface waters were undersaturated in CO2 with respect to atmospheric equilibrium. We present a coherent scheme of the C dynamics of a coccolithophorid bloom along the continental margin of the Bay of Biscay, an active hydrodynamic area, based on standing stocks and processes including 14C-based particulate primary production, CAL and PCR. A carbon budget obtained by integrating PPp, CAL and PCR over the water column highlights the importance of C extracellular production to sustain the bacterial demand in the twilight zone, which has also several repercussions on the fate of organic and inorganic C production in the photic zone during the different stages of the bloom. [less ▲]

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See detailS,T-climatologies of the North Sea using the Variational Inverse Method
Scory, Serge; Ouberdous, Mohamed ULg; Troupin, Charles ULg et al

Poster (2009, April 19)

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See detailA new mechanism of upwelling generated filaments based on potential vorticity balance
Troupin, Charles ULg; Mason, Evan; Beckers, Jean-Marie ULg et al

Poster (2009, April 19)

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See detailFaux jumeaux et bisexualité dans les arts premiers et préhistoriques
Mélon, Jean; Jacob, Laurent; Stassart, Martine ULg

Conference (2009, April 19)

The author compares paleo- and neolithical artistic productions ( objects and pictures of the paleolithical art - 30 to 10.000 years bef. JC - and the neolithical -5 t 2.000 bef. JC) with modern or tribal ... [more ▼]

The author compares paleo- and neolithical artistic productions ( objects and pictures of the paleolithical art - 30 to 10.000 years bef. JC - and the neolithical -5 t 2.000 bef. JC) with modern or tribal sculptures. It appears that the most pregnant theme of these socalled primitive arts is symbolical bisexuality. [less ▲]

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See detailFhit implication in the control of tumor invasion process
Joannes, A; Bonnomet, Arnaud; Polette, Myriam et al

Poster (2009, April 18)

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See detailRegulation of CXCL8/IL-8 expression by Zonula Occludens-1 in human breast cancer cells.
Mestdagt, M; Polette, M; Bindels, S et al

Poster (2009, April 18)

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See detailAdvanced Driver Assistance Systems in Commercial Vehicles and their Safety Potentials
Christen, Fréderic ULg; Zlocki, A.; Becher, T.

in 1. Automotive Colloquium Munich 2008 "Assistance Systems, Drive Units and Drive Trains" (2009, April 16)

Advanced driver assistance systems do not only promise higher driving comfort, but potential benefit for an increase of safety especially for commercial vehicles. Accidents with involve- ment of ... [more ▼]

Advanced driver assistance systems do not only promise higher driving comfort, but potential benefit for an increase of safety especially for commercial vehicles. Accidents with involve- ment of commercial vehicles normally have severe consequences. The Institut für Kraftfahr- zeuge (ika) of the RWTH Aachen University with support from the Institute of Road and Traffic Engineering (isac) of the RWTH Aachen University have investigated in cooperation with the Federal Highway Research Institute (BASt) current and future ADAS for commercial vehicle in order to determine the potential for their benefit to increase road safety. Based on the accidents of official statistics and in-depth analysis of accidents from the GIDAS data base, relevant accident reasons are assessed systematically for a possible interference with selected ADAS. The qualitatively estimated safety potential results from the superposition of the main accident characterisation, the accident type and the accident category. A detailed estimation of the safety potential is conducted by means of simulations with the traffic flow simulation tool PELOPS. A cost-benefit analysis of the investigated systems is conducted. [less ▲]

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See detailTennis et paris sportifs truqués
Fincoeur, Bertrand ULg

Conference (2009, April 16)

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See detailImages, spectacles et médias: quelle place? quelles responsabilités?
Fincoeur, Bertrand ULg

Conference (2009, April 16)

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See detailL’aide juridique belge : entre expertise juridique et défense de causes politiques
Lejeune, Aude ULg

Conference (2009, April 14)

Dans nos sociétés où le recours au droit devient de plus en plus fréquent, de nombreuses initiatives sont mises en place tant par des professionnels du droit, des associations que par les pouvoirs publics ... [more ▼]

Dans nos sociétés où le recours au droit devient de plus en plus fréquent, de nombreuses initiatives sont mises en place tant par des professionnels du droit, des associations que par les pouvoirs publics afin de favoriser l’accès au droit et à la Justice pour l’ensemble des citoyens. Cette communication analyse l’apparition et la constitution d’un mouvement de contestation du système d’aide juridique belge et les stratégies utilisées par ce mouvement pour faire valoir son point de vue auprès des autorités publiques et des professionnels du droit concernés. Depuis les années 1960, l’aide juridique belge est marquée par deux orientations : une approche légaliste portée par les avocats dans le cadre de consultations organisées par les Ordres, permettant à tout citoyen d’avoir accès à l’expertise juridique d’un professionnel, et une approche militante dans le cadre de consultations dans des associations, des syndicats ou des "boutiques de droit", orientées vers une action de type politique. Suite au lobbying exercé par les avocats, la loi de 1998 relative à l’aide juridique soutient très majoritairement l’aide juridique qui s’inscrit dans la première conception de l’accès au droit. Face à cela, un mouvement de contestation, constitué d’avocats militants, d’associations spécialisées dans l’information juridique et d’hommes politiques, revendique un accès au droit qui ne se limite pas à une consultation « neutre » d’un expert du droit, mais à pratiquer une montée en généralités et à construire, à partir des situations singulières, des causes politiques . [less ▲]

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See detailPEGASE : UN MODÈLE INTÉGRÉ BASSIN HYDROGRAPHIQUE / RIVIÈRES POUR LA DIRECTIVE CADRE EUROPÉENNE
Deliège, Jean-François ULg; Everbecq, Etienne ULg; Grard, Aline ULg et al

Conference (2009, April 09)

Presentation of the PEGASE model (Planification Et Gestion de l’ASsainissement des Eaux), developed by the Aquapole Aquapole. New operational way to assess the evolution of the river quality in terms of ... [more ▼]

Presentation of the PEGASE model (Planification Et Gestion de l’ASsainissement des Eaux), developed by the Aquapole Aquapole. New operational way to assess the evolution of the river quality in terms of presures on them, as well as a tool to help competent authorities to optimise the cost/efficiency ratio of the measures foreseen to reduce the impact of these pressures. [less ▲]

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See detailCognitive and affective mechanisms involved in hallucination-proneness
Laroi, Frank ULg

Conference (2009, April 09)

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See detailPeut-on expliquer les patrons d’agrégation spécifiques d’arbres tropicaux à partir de leurs traits ? Une analyse de l’échelle locale à l’échelle régionale.
Rejou-Mechain, Maxime; Bourland, Nils ULg; Flores, O. et al

in Laboratoire d'Ecologie de la FUSAGx (Ed.) ECOVEG 5 - Cinquième colloque d'écologie des communautés végétales (2009, April 08)

Les processus qui génèrent la répartition spatiale des arbres tropicaux ont fait l’objet de nombreuses études. Trois processus semblent déterminants pour la répartition des végétaux : la dispersion ... [more ▼]

Les processus qui génèrent la répartition spatiale des arbres tropicaux ont fait l’objet de nombreuses études. Trois processus semblent déterminants pour la répartition des végétaux : la dispersion limitée, l’histoire de la zone (perturbations anthropiques et histoire climatique) et la différenciation de niche. Leur importance relative est aujourd’hui largement débattue et dépend certainement de l’échelle spatiale considérée. Dans cette étude notre objectif général est de comprendre quels sont les principaux mécanismes qui génèrent les patrons spatiaux des espèces et à quelles échelles ils interviennent. Les données traitées proviennent d’inventaires botaniques réalisés à grande échelle (460000 ha) par des sociétés forestières, en Afrique Centrale (Cameroun et République Centrafricaine). Des mesures d’agrégation spatiale sont réalisées sur 121 espèces d’arbre (individus > à 30 cm de diamètre), dans 4 sites différents et à 3 échelles spatiales : l’échelle locale (0-1 km), l’échelle intermédiaire (1-10 km) et l’échelle du paysage (> à 10 km). Nous testons la relation entre l’agrégation spatiale spécifique et une série de caractéristiques propres aux espèces : le type de diaspore, la tolérance à l’ombre, le type biologique, le système de reproduction et le type phytogéographique. Nos résultats montrent que les patrons d’agrégation spécifiques sont cohérents à travers les sites, jusqu’à l’échelle intermédiaire, mais que les caractéristiques propres aux espèces permettent peu de les prédire. La variation de l’agrégation entre sites pour une même espèce est toutefois très importante et suggère que les patrons d’agrégation observés sont en grande partie dépendants des sites et de leur histoire. Nos résultats suggèrent que les patrons spatiaux spécifiques sont liés à une dispersion limitée à une échelle très locale alors que les patterns observés à des échelles supérieures sont principalement dus à l’histoire des sites et dans certains cas à une forte hétérogénéité environnementale. [less ▲]

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See detailHileôs tôi phorounti. Sérapis sur les gemmes et les bijoux antiques
Veymiers, Richard ULg

Conference (2009, April 06)

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See detailDetecting weeds by artificial vision in carrots: towards optimization of herbicide use
Piron, Alexis ULg; Destain, Marie-France ULg

Conference (2009, April 03)

A method of determining the position of weeds growing in soil amongst horticultural crops is described.

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See detailLes plages d'Agnès. Une pendule sans aiguille
Havelange, Carl ULg

Conference (2009, April 03)

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See detailPlant growth promotion of tomato under field conditions in Burundi
Cawoy, Hélène ULg; Nihorimbere, Venant; Kakana, Pascal et al

Poster (2009, April 02)

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See detailNanocoatings of inorganic surfaces by the layer by layer (LbL) technology
Faure, Emilie ULg; Zocchi, Germaine ULg; Lenoir, Sandrine et al

Poster (2009, April 02)

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See detailDesign of smart polymer micelles for pH triggered drug delivery systems
Jérôme, Christine ULg

Conference (2009, April 02)

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See detailDetermination of phospholipids extracted from Tsukamurella paurometabola C-924 after freeze-drying and during the subsequent storage.
Coulibaly, Ibourahema ULg; Yao, Amenan Anastasie ULg; Dubois Dauphin, Robin ULg et al

Poster (2009, April 01)

The total lipids of Tsukamurella paurometabola C-924 were analysed after freeze-drying. Seven individual lipids classes were identified namly neutral lipids (NLs), fatty acids (FAs), phospholipids (PLs ... [more ▼]

The total lipids of Tsukamurella paurometabola C-924 were analysed after freeze-drying. Seven individual lipids classes were identified namly neutral lipids (NLs), fatty acids (FAs), phospholipids (PLs), sterol ester (SEs), triglycerides (TGs), diglycerides (DGs) and monoglycerides (MGs). The principal fatty acids identified in most lipid classes were palmitic (C16:0), palmitoleic (C16:1), oleic (C18:1), linoleic (C18:2), and linolenic (C18:3). PLs were the major constituents and accounted for 50-60% of the total lipids. PLs were fractionated. . PLs of Tsukamurella paurometabola content phosphatidic acid (PA), phosphatidylethanolamine (PE), phosphatidylinositol (PI), phosphatidylcholine (PC), sphingomyelin (SM), lysophosphatidylcholine (LPC) and phosphatidylglycerol (PG). It was observed that PG had the highest proportion at most points relative to other PLs and was the predominant component of PLs (30%-56%). Evolution of individual rate was followed during stored at 20°C and 40°C with or without lithothamne400®, respectively. [less ▲]

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See detailNew magnetic field measurements of beta Cephei stars and slowly pulsating B stars
Hubrig, Swetlana; Briquet, Maryline ULg; De Cat, P. et al

in IAU Symposium (2009, April 01)

We present the results of the continuation of our magnetic survey with FORS 1 at the VLT of a sample of B-type stars consisting of confirmed or candidate β Cephei stars and Slowly Pulsating B stars ... [more ▼]

We present the results of the continuation of our magnetic survey with FORS 1 at the VLT of a sample of B-type stars consisting of confirmed or candidate β Cephei stars and Slowly Pulsating B stars. Roughly one third of the studied β Cephei stars have detected magnetic fields. The fraction of magnetic Slowly Pulsating B and candidate Slowly Pulsating B stars is found to be higher, up to 50%. We find that the domains of magnetic and non-magnetic pulsating stars in the H-R diagram largely overlap, and no clear picture emerges as to the possible evolution of the magnetic field across the main sequence. [less ▲]

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See detailActivation of the complement by PLGA nanoparticles : an in vitro study.
Sevrin, Chantal ULg; Cerda, B; Patronidou, C et al

Poster (2009, April 01)

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See detailBiodegradable microcarriers for tissue engineering.
Tsoy, A; Markvicheva, E; Lespineux, David et al

Poster (2009, April 01)

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See detailLight scattering properties of exopolysaccharide solutions.
Lespineux, David; Sevrin, Chantal ULg; Freitas, F et al

Poster (2009, April 01)

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See detailPhysico-chemical characterization of new polyhydroxyburates (PHB).
Ottevaere, M; Lespineux, David; Sevrin, Chantal ULg et al

Poster (2009, April 01)

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See detailPreparations and characterisations of semi-solid formulations containing a hydrophilic drug for vaginal administration
Coia, Isabelle ULg; Evrard, Brigitte ULg; Piette, Marie ULg

Poster (2009, April 01)

The purpose of this study is to demonstrate the effect of different types of semi-solid formulations (aqueous gels, liquid jellified emulsions and hydrophilic or lipophilic creams) for vaginal ... [more ▼]

The purpose of this study is to demonstrate the effect of different types of semi-solid formulations (aqueous gels, liquid jellified emulsions and hydrophilic or lipophilic creams) for vaginal administration on the release kinetic of a hydrophilic drug. This drug is an acidic and hydrophilic (log P (octanol/water) = -3.3) molecule with an aqueous solubility upper than 170mg/ml at pH 6-8. The formulations characterisations consisted in the in vitro evaluation of the drug release kinetic and the measure of all formulations viscosity as well as the creams stability and emulsions droplets size. [less ▲]

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See detailAnomalous behaviour in the diffusion of polyethylene oxide through dialysis membrane
Vignisse, Julie ULg; Gustin, Audrey; Lespineux et al

Poster (2009, April 01)

Dialysis is a common technique adopted in biochemistry to purify biopharmaceutical drugs. This methodology is also of interest in macromolecular chemistry and pharmaceutical nanotechnology in order to ... [more ▼]

Dialysis is a common technique adopted in biochemistry to purify biopharmaceutical drugs. This methodology is also of interest in macromolecular chemistry and pharmaceutical nanotechnology in order to purify synthetic macromolecules and nanodrug carriers designed for drug delivery purposes. However, based on their original applications, the diffusion characteristic of the dialysis membrane is given in respect to the diffusion rate of globular proteins. So the diffusion capacity is function of molecular weight cut-off, i.e. corresponding to the maximum molecular weight of a globular macromolecule to be able to cross the membrane. The diffusion kinetics of synthetic macromolecules is expected to differ significantly from globular proteins due to at least the following differences : Specific relationship between hydrodynamic diameter and molecular weight, Flexibility Ionic density Solubility/miscibility/adsorption behaviour with the dialysis membrane Polymer chain entanglement above a critical concentration. In view to validate the application of this technique to purify synthetic macromolecules, we have compared the diffusion ability of neutral polyethyetylene oxide (PEO) standards or poly(dimethyl-aminoethyl-methacrylate) (PMADAM) to protein standards (human insulin and ovalbumin). [less ▲]

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See detailHemoreactivity of poly (dimethyl-aminoethyl-methacrylate) designed for the production of stealth red blood cells
Cerda, B; Pérez, E; Flores, H et al

Poster (2009, April 01)

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See detailGene expression data analysis using spatiotemporal blind source separation
Sainlez, Matthieu ULg; Absil, Pierre-Antoine; Teschendorff, Andrew E.

in Verleysen, Michel (Ed.) ESANN'2009 proceedings, European Symposium on Artificial Neural Networks - Advances in Computational Intelligence and Learning. (2009, April)

We propose a “time-biased” and a “space-biased” method for spatiotemporal independent component analysis (ICA). The methods rely on computing an orthogonal approximate joint diagonalizer of a collection ... [more ▼]

We propose a “time-biased” and a “space-biased” method for spatiotemporal independent component analysis (ICA). The methods rely on computing an orthogonal approximate joint diagonalizer of a collection of covariance-like matrices. In the time-biased version, the time signatures of the ICA modes are imposed to be white, whereas the space-biased version imposes the same condition on the space signatures. We apply the two methods to the analysis of gene expression data, where the genes play the role of the space and the cell samples stand for the time. This study is a step towards addressing a question first raised by Liebermeister, on whether ICA methods for gene expression analysis should impose independence across genes or across cell samples. Our preliminary experiment indicates that both approaches have value, and that exploring the continuum between these two extremes can provide useful information about the interactions between genes and their impact on the phenotype. [less ▲]

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See detailDétection des sapovirus porcins par RT-PCR en temps réel
Mauroy, Axel ULg; Scipioni, Alexandra; Mathijs, Elisabeth et al

Poster (2009, April)

Les sapovirus appartiennent à la famille virale des Caliciviridae. Ces virus sont responsables de gastroentérites épidémiques dans l’espèce humaine et sont actuellement majoritairement détectés en Asie ... [more ▼]

Les sapovirus appartiennent à la famille virale des Caliciviridae. Ces virus sont responsables de gastroentérites épidémiques dans l’espèce humaine et sont actuellement majoritairement détectés en Asie. Des souches de sapovirus ont également été isolées dans l’espèce porcine. Trois pays européens seulement ont rapporté la présence de souches de sapovirus porcins dans leurs troupeaux: la Hongrie (Reuter et al., 2007), l’Italie (Martella et al., 2008) et tout récemment la Belgique (Mauroy et al., 2008). La détection moléculaire de la présence de séquences de sapovirus porcins dans des pays où densités d’élevages et de population humaine se conjuguent posent des questions d’ordre zoonotique, problème déjà en discussion pour des virus qui leur sont proches: les norovirus humains et animaux (Scipioni et al., 2008). De plus l’identification de ces nouveaux pathogènes pour l’espèce porcine suggèrent également d’en évaluer les impacts économique, sanitaire et clinique pour cette filière. Ces questions ne pourront être correctement évaluées que si ces virus sont recherchés et que des méthodes fiables de détection sont développées. Dans une précédente étude (Mauroy et al., 2008), le couple d’amorce p289/p290, développé par Jiang et collaborateurs (1999) pour la détection des calicivirus humains (norovirus et sapovirus), avait permis la détection de séquences génomiques de sapovirus et de norovirus porcins. Les amorces p289/290 ont été utilisées dans cette étude dans une RT-PCR en temps réel mettant à profit la technologie SYBR green. L’étude des courbes de dissociation obtenues nous a permis de pouvoir différencier des échantillons de matières fécales positifs pour la présence de séquences génomiques de sapovirus porcins de ceux qui étaient positifs pour la présence de différents calicivirus humains ou animaux (norovirus humains, sapovirus humains, norovirus bovin et porcin, vésivirus félin isolé de tractus respiratoire, vésivirus félin isolé de tractus digestif). Cette méthode devra être dans un premier temps appliquée à un échantillon plus important de matières fécales confirmées positives pour la présence de sapovirus porcins pour pouvoir être validée. La validation de cette méthode pourra ensuite permettre aux laboratoires de diagnostic de disposer d’une méthode rapide et fiable de détection de ces virus dans les filières concernées. [less ▲]

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See detailLes sutures en dentisterie : théorie et travaux pratiques
LAMBERT, France ULg

Conference (2009, April)

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See detailEffect of single annual infusion of zoledronic acid on bone turnover markers versus daily oral risedronate in patients with glucocorticoid-induced osteoporosis
Sambrook, P.; Reid, D.; Devogelaer, Jean-Pierre et al

in Osteoporosis International (2009, April), 20(Suppl.1), 128-129

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See detailConfidence Levels for the Cycles Found in Air Temperature Data
Mabille, Georges ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg et al

Poster (2009, April)

Recently, new cycles have been observed in air temperature data and proxy series using a wavelet-based methodology. Although many evidences attest the validity of this method applied to climatic data, no ... [more ▼]

Recently, new cycles have been observed in air temperature data and proxy series using a wavelet-based methodology. Although many evidences attest the validity of this method applied to climatic data, no systematic study of its efficiency has been carried out. Here, we estimate the confidence levels for this approach and show that the observed cycles are significant. [less ▲]

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See detailExperimental evaluation of flux footprint by natural tracer experiment
Arriga, N.; Aubinet, Marc ULg; Carrara, A. et al

Poster (2009, April)

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See detailPlant species extinction debt in a biodiversity hotspot: community and species approaches
Piqueray, Julien ULg; Bisteau, Emmanuelle; Cristofoli, Sara et al

Conference (2009, April)

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See detailLes services d'intérêt économique général en Europe : Le cas de la gestion de l'eau en Belgique
Gathon, Henry-Jean ULg; Collignon, Aubry ULg

Conference (2009, April)

Le secteur de l'eau en Belgique, production, distribution, traitement des eaux usées.

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See detailExit Taxes
Richelle, Isabelle ULg

Conference (2009, April)

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See detailLocal electron density reconstruction from simultaneous ground-based GNSS and ionosonde measurements
Stankov, Stanimir; Warnant, René ULg; Stegen, Koen

in Geophysical Research Abstracts (2009, April), 11(Abs. No EGU2009-10956),

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See detailMeasuring Total Electron Content with GNSS: Investigation of Two Different Techniques
Bidaine, Benoît ULg; Warnant, René ULg

in The Institution of Engineering and Technology 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009) (2009, April)

The ionosphere widely affects Global Navigation Satellite Systems (GNSS) applications, inducing among others a delay in GNSS measurements. This delay is closely linked to the Total Electron Content (TEC ... [more ▼]

The ionosphere widely affects Global Navigation Satellite Systems (GNSS) applications, inducing among others a delay in GNSS measurements. This delay is closely linked to the Total Electron Content (TEC) of the ionosphere, a major parameter which can hence be monitored using GNSS. To this extent, phase measurements are taken as a basis for their lower noise level. Levelling strategies have then to be defined for the phase measurements are obtained with an initial unknown number of cycles called ambiguity. The most common technique, referred to as carrier-to-code levelling, consists in using the differences between code and phase measurements and their average on a continuous set of epochs. This option, chosen at the Royal Meteorological Institute (RMI) of Belgium to compute TEC for Belgian GPS stations, requires code hardware delays estimation. Another has been proposed which takes benefit from Global Ionospheric Maps (GIMs) to compute a reference TEC used for ambiguity resolution. In order to understand the consequences of using one method or the other, we compare slant TEC data obtained from both techniques for a mid-latitude station (Brussels) during a high solar activity period (2002). We observed large differences (6.8 TECu on average) showing features apparently related to ionospheric and geomagnetic activity. We attribute these observations to a combination of effects originating in code delays estimation, multipath and noise as well as GIMs errors. We try to differentiate between these effects by focusing on several days and satellites. We concentrate for example on days presenting large TEC differences and geomagnetic disturbances simultaneously (or not) or on satellites displaying recurrent patterns on consecutive days. Finally we highlight the impact of the choice of GIMs involved in sTEC calibration. To this extent, we analyse vertical TEC statistics showing a general underestimation from RMI data. The highest bias (5.8 TECu) is obtained for the UPC GIMs used in the second levelling technique. [less ▲]

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See detail3D characterisation of the structure of activated carbon packed beds using X-ray microtomography
Almazan, Maria del Carmen; Léonard, Angélique ULg; López-Garzón, J. et al

in 3rd International Workshop on Process Tomography (CD Rom) (2009, April)

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See detailFeasibility study of the diluted combustion in a domestic heating boiler
SEGGIO, Giovanni; Ngendakumana, Philippe ULg; PESENTI, Barbara et al

in 4th European Combustion Meeting (ECM2009) (2009, April)

The diluted combustion (called also flameless oxidation) has been already applied in furnaces technology to get high process thermal efficiency with low NOx emissions. The principle of this type of ... [more ▼]

The diluted combustion (called also flameless oxidation) has been already applied in furnaces technology to get high process thermal efficiency with low NOx emissions. The principle of this type of combustion consists in providing a high level of dilution of the reactants with flue gases before combustion reaction occurs, to get a slower reaction in a much larger volume than in classical combustion. The resulting lower local heat release leads to a more homogeneous temperature field in the furnace, without peak values responsible of high thermal NOx formation. There are two requirements for working in diluted combustion: the dilution level of reactants by the flue gases has to be high enough and the temperature level in the combustion chamber has to be above a threshold (the auto-ignition temperature of the mixture). The aim of this work is to assess the technical feasibility and highlight the specific problems of application of diluted combustion in a medium scale boiler. The main difficulty is due to the high geometrical confinement and heat losses of a typical boiler combustion chamber. That prevents from getting the minimum level of reactants dilution and temperature needed to reach diluted combustion regime. The idea is to use a natural gas jet-burner (to preheat the combustion chamber) along with a secondary gas injector in order to get a high entrainment of the flue gases by the reactant jets. In fact the air (through the jet-burner) and the gas (through the secondary gas injector) are injected separately in order to get a high dilution of the reactants and a mixture temperature above the auto-ignition threshold. Our test bench consists in a Viessmann hot water boiler whose nominal output power is 370 kW. The combustion chamber of this boiler is cylindrical (length = 1.41 m, diameter = 0.56 m) and is water-cooled. A preliminary CFD study (Fluent ®) has first been performed to select on the market a jet burner and to determine the position of the air and gas injectors able to generate the requirements of diluted combustion. The influence of the operating conditions (firing rate and excess air) has also been studied numerically. The simulation results show the possibility to obtain a temperature field quite homogenous (typical of diluted combustion) but with a light increase of the CO level at the exit of the combustion chamber. These numerical results (obtained with a simple combustion model) have to be validated experimentally. A first experimental study has been carried out in classical combustion on the boiler equipped with the selected jet-burner. The temperature field has been measured in the median plane of the combustion chamber for different excess air and firing rate. These measurements allowed us to verify that the preheating obtained with the jet-burner was important enough for getting a temperature level above the auto-ignition temperature near everywhere in the combustion chamber. A second experimental study in diluted combustion on the combustion chamber equipped with the secondary gas injector will allow the validation the corresponding numerical results. [less ▲]

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See detailGreenland ice sheet projections from IPCC AR4 global models
Franco, Bruno ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg et al

Poster (2009, April)

The atmosphere-ocean general circulation models (AOGCMs) used for the IPCC 4th Assessment Report (IPCC AR4) are evaluated for the Greenland ice sheet (GrIS) current climate modelling. The most efficient ... [more ▼]

The atmosphere-ocean general circulation models (AOGCMs) used for the IPCC 4th Assessment Report (IPCC AR4) are evaluated for the Greenland ice sheet (GrIS) current climate modelling. The most efficient AOGCMs are chosen by comparison between the 1970-1999 outputs of the Climate of the twentieth Century experiment (20C3M) and reanalyses (ECMWF, NCEP/NCAR). This comparison reveals that surface parameters such as temperature and precipitation are highly correlated to the atmospheric circulation (500 hPa geopotential height) and its interannual variability (North Atlantic oscillation). The outputs of the three most efficient AOGCMs are then used to assess the changes planned by three IPCC greenhouse gas emissions scenarios (SRES) for the 2070-2099 period. Future atmospheric circulation changes should dampen the west-to-east circulation (zonal flow) and should enhance the Meridional Overturning Circulation (MOC). As a consequence, this provides more heat and moisture to the GrIS, increasing temperature on the whole ice sheet and precipitation on the north-eastern region. It is also shown that the GrIS surface mass balance (SMB) anomalies from the SRES A1B scenario are about -300 km³/yr with respect to the 1970-1999 period, leading to 5 cm of global sea-level rise (SLR) for the end of the 21st century. This work helps to choose the boundaries conditions for AOGCMs downscaled future projections. [less ▲]

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See detailEffects of aging and daytime recovery sleep on N-REM slow oscillations
Lafortune, M; Viens, I; Poirier, J et al

Poster (2009, April)

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See detailLayer-by-layer self-assembled chitosan coating on electrospun nanofibers
Croisier, Florence ULg; Aqil, Abdelhafid ULg; Detrembleur, Christophe ULg et al

Poster (2009, April)

By combining electrospinning technique and layer-by-layer deposition, we produced a new material made of multilayered, chitosan-based nanofibers. Layer-by-layer (LBL) is a well-known method for surface ... [more ▼]

By combining electrospinning technique and layer-by-layer deposition, we produced a new material made of multilayered, chitosan-based nanofibers. Layer-by-layer (LBL) is a well-known method for surface coating, based on electrostatic interactions. It enables the controllable deposition of a variety of polyions including synthetic and natural materials, with designable layer structure, defined wall thickness and size. Electrospinning (ESP) technique allows the fabrication of polymer fibers ranging from nanometers to a few microns in diameter, depending on the polymer characteristics (a.o. molecular weight, solution viscosity and conductivity) and processing conditions (electric potential, distance between syringe-capillary and collection plate, concentration, flow rate). Mats of nanofibers produced by ESP display a very large surface area-to-volume ratio and high porosity with very small pore size. The nanometric scale of electrospun fibers also proves a positive effect on cellular growth, as fibers mats mimic extracellular matrix structure. The association of these two techniques with the use of biocompatible and biodegradable polymers such as chitosan, gives outstanding prospects in the field of biomedical applications, especially for the preparation of wound dressings, artificial skin or tissue engineering scaffolds. In the present study, a charged copolymer, poly(methylmethacrylate-block-methacrylic acid), was added to a poly(ε-caprolactone) or poly(D,L-lactide) solution before electrospinning in order to obtain charges on fibers surface. Oppositely charged polyelectrolytes – chitosan and poly(styrene sulfonate) or hyaluronic acid – were then alternately deposited on these aliphatic polyester fiber “cores” using LBL method. The aliphatic polyester core was also removed selectively to confirm the existence of a multilayered shell, obtaining hollow fibers. [less ▲]

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See detailSeismic behavior of the 1943 segment of the North Anatolian Fault
Hubert, Aurelia ULg; Fraser, J. S.; Vanneste, K. et al

in TMMOB Jeoloji Mühendisleri Odasi (Ed.) 62nd Geological Kurultai of Turkey. Abstracts Book: 13-17 April, 2009‬ (2009, April)

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See detailThe Earthquake Sedimentary record of The Lake Hazar along the East Anatolian Fault in Turkey
Boes, Xavier; Hubert, Aurelia ULg; Garcia, David et al

in Geophysical Research Abstracts (2009, April), 11

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See detailEffects of consolidation of procedural motor memory traces on slow and fast spindles
Barakat, M; Doyon, J; Debas, K et al

Poster (2009, April)

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See detailSur la consistance du lissage des contraintes par convolution
Debongnie, Jean-François ULg

in Agouzoul, Mohammed (Ed.) Actes du neuvième congrès de mécanique (2009, April)

This paper is devoted to the analysis of a stress-smoothing procedure by convolution. The key result is that any convolution kernel does not generally lead to accurate results, it is to say, a consistency ... [more ▼]

This paper is devoted to the analysis of a stress-smoothing procedure by convolution. The key result is that any convolution kernel does not generally lead to accurate results, it is to say, a consistency condition has to be verified. Consistent kernels are then developed. [less ▲]

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See detailOn the TEC short-term forecast with corrections based on the average ionospheric response to background and storm-time geomagnetic conditions
Stankov, Stanimir; Warnant, René ULg; Kozarev, R.

in Geophysical Research Abstracts (2009, April), 11(Abs. No EGU2009-13283),

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See detailNewborn Screening for Sickle Cell Disease using Tandem Mass Spectrometry
BOEMER, François ULg

Conference (2009, April)

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See detailTime series of 12CO and 13CO at northern mid-latitudes: Determination of Partial Column and δ13C seasonal and interannual variations
Mahieu, Emmanuel ULg; Duchatelet, Pierre ULg; Rinsland, C. P. et al

in Geophysical Research Abstracts (2009, April), 11(EGU2009-10017-1),

Carbon monoxide (CO) is an important reactive gas in the troposphere. It is emitted at the ground level by fossil fuel combustion and biomass burning. Biogenic sources and oceans as well as oxidation of ... [more ▼]

Carbon monoxide (CO) is an important reactive gas in the troposphere. It is emitted at the ground level by fossil fuel combustion and biomass burning. Biogenic sources and oceans as well as oxidation of methane and nonmethane hydrocarbons complete the emissions budget. Large uncertainties still affect the relative contributions of the identified anthropogenic and natural sources. Destruction by the hydroxyl radical (OH) is the main removal process for CO in both the troposphere and the stratosphere. The resulting average tropospheric lifetime of CO varies from several weeks to a few months. Two approaches have been developed and optimized to independently retrieve abundances of 12CO and 13CO from high-resolution ground-based infrared solar spectra, using sets of carefully selected lines and the SFIT-2 (v3.91) algorithm which implements the optimal estimation method. The corresponding products will be described and characterized in terms of error budget and information content. These strategies have allowed us to produce partial column time series of 12CO and 13CO, using spectra recorded on a regular basis at the Jungfraujoch station (46.5ºN, 8.0ºE, 3580 m asl, Swiss Alps), a site of the Network for the Detection of Atmospheric Composition Change (NDACC). The seasonal and interannual changes observed in the 12CO,13CO and δ13C (13C/12C) data sets will be presented and discussed. Complementary zonal mean time series derived from occultation measurements collected by the ACE-FTS instrument onboard the Canadian SCISAT-1 platform since 2004 will also be included and analyzed, focusing on the upper troposphere-lower stratosphere region of the atmosphere. Finally, we will use GEOS-Chem 3-D chemistry transport model results to help in the interpretation of the short and long-term variations characterizing the ground-based and satellite data sets, focusing on the factors influencing the partitioning between the two CO isotopologues. [less ▲]

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