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See detailA web interface for griding arbitrarily distributed in situ data based on Data-Interpolating Variational Analysis (Diva)
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Troupin, Charles ULg et al

Conference (2009)

Spatial interpolation of observations on a regular grid is a common task in many ceanographic disciplines (and geosciences in general). It is often used to create climatological maps for physical ... [more ▼]

Spatial interpolation of observations on a regular grid is a common task in many ceanographic disciplines (and geosciences in general). It is often used to create climatological maps for physical, biological or chemical parameters representing e.g. monthly or seasonally averaged fields. Since instantaneous observations can not be directly related to a field representing an average, simple spatial interpolation of observations is in general not acceptable. Diva (Data-Interpolating Variational Analysis) is an analysis tool which takes the error in the observations and the typical spatial scale of the underlying field into account. Barriers due to the coastline and the topography in general and also currents estimates (if available) are used to propagate the information of a given observation spatially. Diva is a command-line driven application written in Fortran and Shell Scripts. The observations and parameters are specified by the user using text files. The analyzed field and the expected error variance are returned as NetCDF files. This form of interaction with Diva is very similar to other high-performance codes and is a familiar approach for ocean modelers. However it represents a steep learning curve for oceanographers from other disciplines not familiar with command-line applications and programming. To make Diva easier to use, a web interface has been developed (http://gher-diva.phys.ulg.ac.be). Installation and compilation of Diva is therefore not required. The user can directly upload his/her data in ASCII format and enter several parameters for the analysis. The analyzed field, location of the observations, and the error mask are presented as different layers using the Web Map Service protocol. They are visualized in the browser using the Javascript library OpenLayers allowing the user to interact with layers (for example zooming and panning). Finally, the results can be downloaded as a NetCDF file, Matlab file (also readable in Octave, an open source program similar to Matlab) and Keyhole Markup Language (KML) file for visualisation in applications such as Google Earth. [less ▲]

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See detailAcidity in Ionic liquids: from the determination of an acidity scale to the application in catalytic reactions
Olivier-Bourbigou, Hélène; Gilbert, Bernard ULg; Magna, Lionel et al

Conference (2009)

Detailed reference viewed: 22 (1 ULg)
See detailAnalyse de bijoux mérovingiens en Belgique
Mathis, François ULg; Othmane, Guillaume; Vrielynck, Olivier

Conference (2009)

Detailed reference viewed: 13 (2 ULg)
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See detailNon-native variëteiten van het Nederlands: verwerving en didactiek
Rasier, Laurent ULg

Conference (2009)

Detailed reference viewed: 12 (0 ULg)
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See detailA One-Field Discontinuous Galerkin Formulation of Non-Linear Kirchhoff-Love Shells
Noels, Ludovic ULg

Conference (2009)

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior. This is particularly appealing ... [more ▼]

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior. This is particularly appealing for problems involving high-order derivatives, since discontinuous Galerkin (DG) methods can also be seen as a means of enforcing higher-order continuity requirements. Recently, DG formulations of linear and non-linear Kirchhoff-Love shell theories have been proposed. This new one-field formulations take advantage of the weak enforcement in such a way that the displacements are the only discrete unknowns, while the C1 continuity is enforced weakly. The resulting one field formulation is a simple and efficient method to model thin structures and can be applied to various computational methods. [less ▲]

Detailed reference viewed: 52 (9 ULg)
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See detailSearching for traces of life in ancient stromatolites down to the nanoscale.
Lepot, Kevin ULg; Philippot, Pascal; Benzerara, Karim et al

Conference (2009)

Detailed reference viewed: 25 (1 ULg)
See detailThe socio-economic integration of migrants in Spain
Brey, Elisa ULg

Conference (2009)

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See detailEtude épidémiologique des comportements alimentaires au service de la promotion de la santé
Lair, ML; Alkerwi, A; Couffignal, S et al

Conference (2009)

Detailed reference viewed: 9 (4 ULg)
See detailLes premières plantes terrestres (Embryophytes) : origine et diversification - deuxième partie.
Gonez, Paul ULg; Prestianni, Cyrille ULg; Strullu-Derrien, Marie-Christine et al

Conference (2009)

Detailed reference viewed: 34 (1 ULg)
See detailThe Upper Palaeolithic of Uzbekistan
Kolobova, Ksenia; Flas, Damien ULg

Conference (2009)

Detailed reference viewed: 6 (0 ULg)
See detailQuelle politique fisale internationale pour la Belgique?
Bourgeois, Marc ULg

Conference (2009)

Detailed reference viewed: 3 (0 ULg)
See detailThe chick embryo as a model to study persistent effects of embryonic protein-undernutrition on postnatal growth and metabolism
Everaert, Nadia ULg; Métayer-Coustard, S.; Willemsen, H. et al

Conference (2009)

Detailed reference viewed: 9 (0 ULg)
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See detailEco-éthologie de la population de bonobos récemment découverte dans l’ouest de la République Démographique du Congo
Serckx, Adeline ULg; Huynen, Marie-Claude ULg; Beudels-Jamar, Roseline

Conference (2009)

The bonobo, Pan paniscus, an endemic primate of the DRC, forms with the chimpanzee, Pan troglodytes, the pair of species closest to humans. Classified as “Endangered” by the IUCN, it’s seriously ... [more ▼]

The bonobo, Pan paniscus, an endemic primate of the DRC, forms with the chimpanzee, Pan troglodytes, the pair of species closest to humans. Classified as “Endangered” by the IUCN, it’s seriously threatened by the degradation of the forests. Only the creation of protected areas large enough and properly managed can improve its status but requires a good knowledge of the eco-ethology of the local populations. Our project will focus on studying a bonobo population recently discovered in the region of the Lake Tumba, in the west of the DRC. It is characterized by densities never encountered elsewhere, and a preliminary study has revealed significant differences in habitat and food resources in comparison to these of eastern populations. We will contribute to a recently established WWF conservation program by gathering eco-ethological data on bonobos, data that will allow identifying areas to protect, their boundaries and management measures to implement. To do this, we will study the diet of bonobos via direct and indirect observations of their behavior. We will also study the party size and its composition and identify underlying environmental factors. We will assess the bonobos’ home range size and pattern of displacement, which we will correlate with the abundance of food resources to determine whether there is a pattern of occupation of time and space specific to this population. [less ▲]

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See detailLa vente de gré à gré
Kohl, Benoît ULg

Conference (2009)

Detailed reference viewed: 3 (0 ULg)
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See detailBody dermatitis in a donkey caused by the Psoroptes ovis
Mignon, Bernard ULg; Lekimme, Mireille ULg; Huynen, K. et al

Conference (2009)

Detailed reference viewed: 51 (10 ULg)
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See detailCalculation of mechanical properties of polymeric foams with closed cell structure produced on the basis of neoprene
Pyka, Grzegorz; Wevers, Martine; Kerckhofs, Greet ULg et al

Conference (2009)

Detailed reference viewed: 12 (0 ULg)
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See detailIRF3 is required for induction of allergic airway inflammation by dendritic cells
Marichal, Thomas ULg; Bedoret, Denis; Goriely, M. et al

Conference (2009)

Detailed reference viewed: 46 (11 ULg)
See detailLocal ionospheric activity – nowcast and forecast services
Stankov, Stanimir; Warnant, René ULg; Stegen, Koen et al

Conference (2009)

Detailed reference viewed: 15 (0 ULg)
See detailFootball, nationalisme et gouvernance
Tuñón, Jorge; Brey, Elisa ULg

Conference (2009)

Detailed reference viewed: 9 (0 ULg)
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See detailHyperfine Structure and Isotope Shifts in Iron Atoms
Krins, Stéphanie ULg; Oppel, S.; Huet, Nicolas ULg et al

Conference (2009)

Detailed reference viewed: 23 (2 ULg)
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See detailTerritorial reconversion and territorial knowledge: added-value of a territorial intelligence process in Flémalle (Belgium)
Breuer, Christophe ULg; Devillet, Guénaël ULg; Merenne-Schoumaker, Bernadette ULg

Conference (2009)

Our communication aims at spreading the participative approach implemented in Flémalle (“new governorship”), but also at discussing the contribution of the theorical and applied research undertaken within ... [more ▼]

Our communication aims at spreading the participative approach implemented in Flémalle (“new governorship”), but also at discussing the contribution of the theorical and applied research undertaken within the framework of the coordination action of the European Network of Territorial Intelligence for local projects (NTIC, participation, animation, analyzes….), the objective is to measure its added-value and transposability within territories of industrial tradition in a context of financial and temporal limitations. [less ▲]

Detailed reference viewed: 180 (34 ULg)
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See detailLe temps des tribus et des ghettos?
Delruelle, Edouard ULg

Conference (2009)

Detailed reference viewed: 4 (0 ULg)
See detailL'intégration sociale des immigrés en Espagne
Brey, Elisa ULg

Conference (2009)

Detailed reference viewed: 11 (3 ULg)
See detailDynamically constrained ensemble perturbations. Application to tides on the West Florida Shelf
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Beckers, Jean-Marie ULg et al

Conference (2009)

A method is presented to create an ensemble of perturbations that satisfies linear dynamical constraints. A cost function is formulated defining the probability of each perturbation. It is shown that the ... [more ▼]

A method is presented to create an ensemble of perturbations that satisfies linear dynamical constraints. A cost function is formulated defining the probability of each perturbation. It is shown that the perturbations created with this approach take the land-sea mask into account in a similar way as variational analysis techniques. The impact of the land-sea mask is illustrated with an idealized configuration of a barrier island. Perturbations with a spatially variable correlation length can be also created by this approach. The method is applied to a realistic configuration of the West Florida Shelf to create perturbations of the M2 tidal parameters for elevation and depth-averaged currents. The perturbations are weakly constrained to satisfy the linear shallow-water equations. Despite that the constraint is derived from an idealized assumption, it is shown that this approach is applicable to a non-linear and baroclinic model. The amplitude of spurious transient motions created by constrained perturbations of initial and boundary conditions is significantly lower compared to perturbing the variables independently or to using only the momentum equation to compute the velocity perturbations from the elevation [less ▲]

Detailed reference viewed: 17 (8 ULg)
See detailThermal manipulations of broiler embryos during late incubation and their immediate and long-lasting effects
Willemsen, H.; Everaert, Nadia ULg; Tona, K. et al

Conference (2009)

Detailed reference viewed: 9 (0 ULg)
See detailModelling error of a hydrodynamic model of the Mediterranean Sea
Vandenbulcke, Luc ULg; Rixen, M.; Beckers, Jean-Marie ULg et al

Conference (2009)

Detailed reference viewed: 14 (2 ULg)
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See detailContrastieve onderzoeksmodellen onder de loep
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2009)

Detailed reference viewed: 20 (1 ULg)
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See detailOperational Determination of Multiqubit Entanglement Classes
Bastin, Thierry ULg

Conference (2009)

Detailed reference viewed: 9 (3 ULg)
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See detailUltrahigh resolution laser spectroscopy and isotope shifts for iron atoms
Krins, Stéphanie ULg; Oppel, S.; Huet, Nicolas ULg et al

Conference (2009)

Detailed reference viewed: 22 (5 ULg)
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See detailDetecting preferential flow and transport in soils using electrical resistivity tomography
Vanderborght, Jan; Oberdoerster, Christoph; Garré, Sarah ULg et al

Conference (2009)

Detailed reference viewed: 45 (1 ULg)
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See detailResemantisation in varieties of Dutch
De Vos, Lien ULg

Conference (2009)

Detailed reference viewed: 21 (0 ULg)
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See detailDoes music education facilitate the perception of prosodic prominence in a foreign language?
Rasier, Laurent ULg; Degrave, Pauline; Hiligsmann, Philippe

Conference (2009)

Detailed reference viewed: 10 (0 ULg)
See detailNarrative roles of the particle isT
Gillen, Todd Jonathan ULg

Conference (2009)

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See detailCodes, chartes et labels de qualité : conséquences juridiques pour les entrepreneurs
Kohl, Benoît ULg

Conference (2008, December 19)

Detailed reference viewed: 23 (1 ULg)
See detailLa déontologie de l'information
Vanesse, Marc ULg

Conference (2008, December 18)

Journée de réflexion sur la déontologie de l'information avec plusieurs intervenants : un avocat pénaliste, le secrétaire général adjoint de l'Association des journalistes de Belgique, l'auteur d'une ... [more ▼]

Journée de réflexion sur la déontologie de l'information avec plusieurs intervenants : un avocat pénaliste, le secrétaire général adjoint de l'Association des journalistes de Belgique, l'auteur d'une recherche sur la caméra cachée, un journaliste d'investigation. [less ▲]

Detailed reference viewed: 22 (5 ULg)
See detailIntroduction to Fiscal Federalism in Belgium
Bourgeois, Marc ULg

Conference (2008, December 18)

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See detailÀ propos d’épiclèses « trans-divines » : le cas de Zeus et d’Athéna à Cos
Paul, Stéphanie ULg

Conference (2008, December 12)

Dans l’île de Cos, Zeus et Athéna sont honorés sous cinq épiclèses différentes : Polieus/Polias, Machaneus/Machanis, Alseios/Alseia, Phatrios/Phatria et Sôter/Sôteira. L’article présente une étude des ... [more ▼]

Dans l’île de Cos, Zeus et Athéna sont honorés sous cinq épiclèses différentes : Polieus/Polias, Machaneus/Machanis, Alseios/Alseia, Phatrios/Phatria et Sôter/Sôteira. L’article présente une étude des sources épigraphiques qui nous renseignent sur ces cultes, afin de proposer une interprétation de la manière dont fonctionnent ces différentes paires de divinités au sein du panthéon de la cité. Parmi celles-ci, le culte de Zeus Polieus et d’Athéna Polias fera l’objet d’une étude particulière, car il semble y occuper une place centrale. Ce sera également l’occasion de replacer ces cultes dans le contexte historique de la cité, qui a connu un synécisme, de mettre en parallèle le cas de Cos avec ceux de Rhodes et Athènes, et de poser diverses questions qui y sont liées, comme par exemple celle des divinités « poliades ». [less ▲]

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See detailTesi Samanunga : La littérature en langue thioise dans la Principauté de Liège
Vromans, Joseph ULg

Conference (2008, December 12)

Detailed reference viewed: 36 (1 ULg)
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See detailÀ l’Hôtel des Étrangers, repaire d’une bohème zutique
Saint-Amand, Denis ULg

Conference (2008, December 12)

Detailed reference viewed: 66 (4 ULg)
See detailLes mutations récentes du champ éditorial belge
Habrand, Tanguy ULg

Conference (2008, December 12)

Detailed reference viewed: 15 (2 ULg)
See detailDas Leben der Anderen
Hamers, Jérémy ULg

Conference (2008, December 11)

Detailed reference viewed: 20 (0 ULg)
See detailImmuno PCR : a new tool for the ultra-sensitive detection of biomolecules
Zorzi, Willy ULg; Elmoualij, Benaïssa ULg

Conference (2008, December 11)

Detailed reference viewed: 5 (0 ULg)
See detailCommunication, médiation, vulgarisation
Servais, Christine ULg

Conference (2008, December 11)

Detailed reference viewed: 49 (11 ULg)
See detailInvisible Computer for Design Activities
Safin, Stéphane ULg

Conference (2008, December 11)

Detailed reference viewed: 4 (0 ULg)
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See detailApproche physiopathologique du nouveau-né et de l'enfant en soins intensifs
Battisti, Oreste ULg

Conference (2008, December 10)

Detailed reference viewed: 43 (9 ULg)
See detailParliamentary TA Institutions as Indications of Reflexive Modernization
Delvenne, Pierre ULg

Conference (2008, December 10)

Detailed reference viewed: 8 (0 ULg)
See detailPoint de vue de la SBAR
Brichant, Jean-François ULg

Conference (2008, December 06)

Detailed reference viewed: 9 (0 ULg)
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See detailLes stratégies juridiques des entreprises en Europe
Petit, Nicolas ULg

Conference (2008, December 05)

Detailed reference viewed: 10 (2 ULg)
See detailInsuffisance rénale chronique : "Epidemiology of CVRF"
Krzesinski, Jean-Marie ULg

Conference (2008, December 05)

Detailed reference viewed: 4 (0 ULg)
See detailLe management cohérent de l'entreprise coopérative
Mertens de Wilmars, Sybille ULg

Conference (2008, December 04)

Detailed reference viewed: 13 (3 ULg)
Peer Reviewed
See detailLa base de données du CIEL
Dozo, Björn-Olav ULg; Vanderpelen, Cécile

Conference (2008, December 04)

Detailed reference viewed: 7 (1 ULg)
See detailTiO2 mesoporous thin films acting as photoelectrode in dye-sensitized solar cells
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Henrist, Catherine ULg

Conference (2008, December 03)

This study aims at developing thin films of nanocrystalline, mesostructured titanium dioxide in order to build low cost and efficient photovoltaic devices. The synthesis is based on the Evaporation ... [more ▼]

This study aims at developing thin films of nanocrystalline, mesostructured titanium dioxide in order to build low cost and efficient photovoltaic devices. The synthesis is based on the Evaporation Induced-Self Assembly method using titanium isopropoxide as inorganic source, block copolymers as structuring and porogeneous agents and ethanol as solvent. The films were obtained by dip-coating various substrates in the solution. The influence of different experimental parameters, such as dip-coating and ageing relative humidity, withdrawal speed, surfactant:Ti ratio, substrate, was studied. The post-deposition thermal treatment had to be accurately adjusted in order to maximise the crystallisation of the inorganic network while avoiding the collapse of the porous mesostructure. The final structure obtained is discussed in the light of the XRD results combined with TEM analysis. Moreover the cell performance is limited by the film thickness which is mainly responsible of the small amount of absorbed light. Therefore a multilayer deposition process was studied and the as-obtained mesostructure was characterized by TEM, RBS and environmental ellipsometry. [less ▲]

Detailed reference viewed: 19 (3 ULg)
See detailHypertension artérielle et alimentation
Krzesinski, Jean-Marie ULg

Conference (2008, December 02)

Detailed reference viewed: 9 (3 ULg)
See detailThe variation of different components of Jupiter's auroral emission
Nichols, J.; Clarke, J.; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

In this paper we use the extensive HST data set obtained over two month-long campaigns in 2007 to determine the long term variability of the different components of Jupiter's auroras. We define three ... [more ▼]

In this paper we use the extensive HST data set obtained over two month-long campaigns in 2007 to determine the long term variability of the different components of Jupiter's auroras. We define three regions on the planet's disc, i.e. the main oval, the low latitude, and high latitude auroras, and extract the UV auroral power emitted therefrom. The high latitude region was also further divided into the polar inner and polar outer regions. We discuss the temporal variation of these parameters with reference to the auroral morphology and estimated solar wind conditions projected to Jupiter's orbit from data obtained at Earth orbit. We show that the auroral morphology was very different between the first and second campaigns. In the first campaign the emitted power originated mainly from the main oval and the high latitude regions, which roughly correlated, and exhibited enhancements that are suggested to be associated with compression regions. In the second campaign the high latitude and main oval auroras were generally dimmer overall and less variable, while the low latitude region was populated with bright, patchy emission. We show that a particular auroral morphology is probably associated specifically with compression regions, i.e. over longitudes greater than approx. 180 degrees the main oval is bright and located approx. 1 degree poleward of its previous location, while over smaller longitudes the main oval is not bright or well defined. Instead there is bright emission originating from the contiguous poleward region in the afternoon/dusk sector where bright, sometimes multiple arcs form. It remains unclear, however, whether this state is a response to the initial shock or some other event within the rapidly-varying compression regions. We also show that the dawn storm events, typically associated with intense dawn side main oval auroras also result in the brightening of the high latitude auroras, even to the very highest latitude components, which presumably map to a very different region of the magnetosphere. However, apart from the dawn storms and bright poleward arcs in the afternoon/dusk sector, the power emitted from the poleward auroras is generally uncorrelated with that of the main oval. [less ▲]

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See detailCoordinated measurements of auroral processes at Saturn from the Cassini spacecraft and HST
Mitchell, D. G.; Kurth, William; Hospodarsky, G. B. et al

Conference (2008, December 01)

One of the primary Cassini mission objectives at Saturn is to characterize Saturn's aurora-its spatial morphology, associated particle energization, radio wave generation, and magnetospheric currents ... [more ▼]

One of the primary Cassini mission objectives at Saturn is to characterize Saturn's aurora-its spatial morphology, associated particle energization, radio wave generation, and magnetospheric currents, relationship with solar wind pressure and magnetic field, and its large scale mapping to the magnetosphere. By design, the Cassini orbital tour included high inclination and low periapsis orbits late in the prime mission specifically to address many of these topics. In this presentation, we will provide a snapshot of the current state of our investigation into the relationship between magnetospheric measurements of particles and fields, and the aurora. For in situ data, we will show measurements of upward traveling light ion conics (~30 keV to 200 keV), often accompanied by electron beams (<20 keV to ~1 MeV) and enhanced broadband noise (10 Hz to a few kHz), throughout the outer magnetosphere on field lines that nominally map from well into the polar cap (dipole L > 50) to well into the closed field region (dipole L < 10). Sometimes the particle phenomena and the broadband noise occur in pulses of roughly five-minute duration, separated by tens of minutes. At other times they are relatively steady over an hour or more. Magnetic signatures associated with some of the pulsed events are consistent with field aligned current structures. Correlative observations of solar wind (Cassini) and aurora (HST) have established a strong relationship between solar wind pressure and auroral activity (brightness) (Crary et al., Nature, 2005; Clarke et al., JGR, 2008). A similar correspondence between bright auroral arcs and ring current ion acceleration will be shown here. So while some auroral forms seem to be associated with the open/closed field boundary (i.e. in the cusp-Bunce et al., JGR, 2008), we also demonstrate that under some magnetospheric conditions for which protons and oxygen ions are accelerated once per Saturn magnetosphere rotation at a preferred local time between midnight and dawn, simultaneous auroral observations by the HST reveal a close correlation between these dynamical magnetospheric events and dawn-side transient auroral brightenings. Likewise, many of the recurrent energetic neutral atom enhancements coincide closely with bursts of Saturn kilometric radiation, again suggesting a linkage with high latitude auroral processes. Finally, we will show some intriguing results of auroral movie sequences from the Cassini UVIS instrument with corresponding ring current movies from the Magnetospheric Imaging Instrument Ion and Neutral Camera (MIMI/INCA). [less ▲]

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See detailIntérêt de l'évaluation de l'efficacité d'une prise en charge
Adam, Stéphane ULg

Conference (2008, December 01)

Detailed reference viewed: 8 (0 ULg)
See detailSaturn Auroral Movies from Cassini UVIS
Pryor, W. R.; Stewart, I.; Esposito, L. et al

Conference (2008, December 01)

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

Cassini's Ultraviolet Imaging Spectrograph (UVIS) has completed four years of study of Saturn's atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and FUV data from 111.5-191.3 nm. 64 spatial pixels along each slit are combined with slit motion to construct spectral images of Saturn. Auroral emissions are seen from electron-excited molecular and atomic hydrogen. In 2008 UVIS obtained data with the spacecraft well out of Saturn's ring plane, permitting UVIS to obtain a number of short movies of the rotating auroral structures. In some movies a cusp-like feature is present near noon inside the oval. One movie from 2008 day 201 shows parallel linear features on the day side almost at right angles to the main auroral oval that appear, then lengthen, separate in the middle, and then fade away. The same movie also shows one bright "polar flare" inside the oval. A few of the most recent images were obtained at sufficiently close range that 2 spacecraft slews were needed to completely cover the oval. These images provide almost 100 pixels of information across the oval and clearly show multiple arcs of emission on the main oval and scattered emissions inside the oval. We will discuss these features, their locations, and possible interpretations. [less ▲]

Detailed reference viewed: 47 (2 ULg)
See detailThe Ultraviolet Spectrograph (UVS) on Juno
Gladstone, G. R.; Persyn, S.; Eterno, J. et al

Conference (2008, December 01)

Juno, a NASA New Frontiers mission, plans for launch in August 2011, a 5-year cruise (including a flyby of Earth in October 2013 for a gravity boost), and 14 months around Jupiter after arriving in August ... [more ▼]

Juno, a NASA New Frontiers mission, plans for launch in August 2011, a 5-year cruise (including a flyby of Earth in October 2013 for a gravity boost), and 14 months around Jupiter after arriving in August 2016. The spinning (2 RPM), solar-powered Juno will study Jupiter from a highly elliptical orbit, in which the spacecraft (for about 6 hours once every 11 days) dives down over the north pole, skims the outermost atmosphere, and rises back up over the south pole. This orbit allows Juno avoid most of the intense particle radiation surrounding the planet and provides an excellent platform for investigating Jupiter's polar magnetosphere. Part of the exploration of Jupiter's polar magnetosphere will involve remote sensing of the far-ultraviolet H and H2 auroral emissions, plus gases such as methane and acetylene which add their absorption signature to the H2 emissions. This hydrocarbon absorption can be used to estimate the energy of the precipitating electrons; since more energetic electrons penetrate deeper into the atmosphere and the UV emissions they produce will show more absorption. Juno will carry an Ultraviolet Spectrograph (UVS) to make spectral images of Jupiter's aurora. UVS is a UV imaging spectrograph sensitive to both extreme and far ultraviolet emissions in the 70-205~nm range that will characterize the morphology and spectral nature of Jupiter's auroral emissions. Juno UVS consists of two separate sections: a dedicated telescope/spectrograph assembly and a vault electronics box. The telescope/spectrograph assembly contains a telescope which feeds a 0.15-m Rowland circle spectrograph. The telescope has an input aperture 40à 40~mm2 and uses an off-axis parabolic primary mirror. A flat scan mirror situated at the front end of the telescope (used to target specific auroral features at up to ±30° perpendicular to the Juno spin plane) directs incoming light to the primary. The light is then focused onto the spectrograph entrance slit, which has a 'dog- bone' shape 6° long, in three 2° sections of 0.2°, 0.05°, and 0.2° width (projected onto the sky). Light entering the slit is dispersed by a toroidal grating which focuses the UV bandpass onto a curved microchannel plate (MCP) cross delay line (XDL) detector with a solar blind UV- sensitive CsI photocathode, which makes up the instrument's focal plane. Tantalum shielding surrounds the detector assembly to protect the detector and the adjacent detector electronics from high-energy electrons. The main electronics box is located in the Juno vault. Inside are two redundant high-voltage power supplies (HVPS), two redundant low-voltage power supplies, the command and data handling (C&DH) electronics, heater/actuator activation electronics, scan mirror electronics, and event processing electronics. An overview of the UVS design and scientific performance will be presented. [less ▲]

Detailed reference viewed: 118 (8 ULg)
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See detailNeutral Ion Coupling Explorer satellite measurements of thermospheric composition, winds and temperatures.
Mende, S. B.; Immel, T. J.; England, S. et al

Conference (2008, December 01)

A new Small Explorer mission, the Neutral Ion Coupling Explorer (NICE) mission, was selected for study by NASA to specifically address neutral ion coupling in the Earth's atmosphere. The main goal of NICE ... [more ▼]

A new Small Explorer mission, the Neutral Ion Coupling Explorer (NICE) mission, was selected for study by NASA to specifically address neutral ion coupling in the Earth's atmosphere. The main goal of NICE is to study neutral-ion coupling at low latitudes where the densest plasma in geospace is created and where a number of remarkable interactions between the plasma and neutral gas occur even in the relative absence of high-latitude forcing. NICE will study this region from a ~24 degree inclination 550 km circular orbit, residing entirely on closed magnetic field lines. The relatively fast precession of low-inclination orbit is favorable for frequent sampling of all local times for the determination of tidal structures. It is now widely recognized that the neutral thermosphere has a strong influence on the ionosphere and that Earth's ionosphere at quiet times is actually tidally dominated. The NICE concept is unique in simultaneously providing measurements of the parameters relevant to ion production and motion across the entire altitude range of the low-latitude ionosphere. The science payload consists of 3 remote sensing instruments viewing the atmospheric limb (1) a dual Doppler Fabry-Perot Interferometer (FP), scanning in altitude to measure neutral wind vector and temperature altitude profiles in the E- and F-regions, (2) a Far Ultraviolet (FUV) imager to measure daytime neutral composition and image the nighttime F-layer intensity distributions, and (3) an Extreme Ultraviolet (EUV) altitude profiler to retrieve daytime F-layer properties. In addition, an Ion Velocity Meter (IVM) measures the in-situ ion drifts. NICE will take advantage of an elegant choice of orbit and instrument viewing geometries to make coordinated and complementary observations at all local times, with optimal conjunction of measurements occurring near the equator. The observations are accompanied by a suite of advanced numerical models and analysis techniques. [less ▲]

Detailed reference viewed: 80 (7 ULg)
Peer Reviewed
See detailElaboration of Magnetic Nanodots by Nanosphere Lithography : a Computerized Method for Order Quantification
Colson, Pierre ULg; Cloots, Rudi ULg; Henrist, Catherine ULg

Conference (2008, December 01)

Nanosphere lithography (NSL) is an ideal inexpensive fabrication tool for producing regular, nearly homogenous arrays of nanoparticules with different sizes. There are many different methods for the ... [more ▼]

Nanosphere lithography (NSL) is an ideal inexpensive fabrication tool for producing regular, nearly homogenous arrays of nanoparticules with different sizes. There are many different methods for the fabrication of the latex monolayer based on electrophoresis, the controlled evaporation of a solvent from the suspension containing latex particles, spincoating etc… We focused our work on this last method. The main problem with formation of 2D latex monolayers is that there are always a high number of different structural defects such as: point defects (vacancies), line defects (dislocations) and also many disordered areas. The influence of the different spincoating parameters on the amount of defects was determined by image analysis of SEM micrographies from the different samples. FePt and Co films were deposited onto quartz substrates through the polystryrene monolayers by magnetron sputtering. The nanopsheres were removed by sonication in toluene. Post-deposition annealing treatment was performed under reductive atmosphere for the FePt nanodots in order to transform the as-deposited chemically disoredered face-centered cubic (fcc) structure into the chemically ordered face-centered tetragonal (fct) phase (L10-phase). DRX , SEM and MFM analysis were performed on the different samples. [less ▲]

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See detailL'audit social. Evaluez les risques sociaux de votre entreprise !
Robert, Frédéric; Maréchal, Benoît ULg

Conference (2008, December 01)

This seminar introduce to the practice of the social audit with regard to compagnies. On basis of a list of social risks with regard to labour law and social security law, the Authors illustrated how ... [more ▼]

This seminar introduce to the practice of the social audit with regard to compagnies. On basis of a list of social risks with regard to labour law and social security law, the Authors illustrated how these risks could be examined and evaluated in the case of a social audit of the company. [less ▲]

Detailed reference viewed: 162 (4 ULg)
See detailRecent results from HST and ground-based observations of Saturn's aurora
Grodent, Denis ULg; Stallard, T.; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

Current observations of Saturn's aurora performed from Earth-orbit with HST and ground based instruments more than complement the in situ measurements obtained by the Cassini spacecraft. These remote ... [more ▼]

Current observations of Saturn's aurora performed from Earth-orbit with HST and ground based instruments more than complement the in situ measurements obtained by the Cassini spacecraft. These remote observations focus on two spectral windows revealing different facets of the same auroral phenomenon. The auroral photons captured in the ultraviolet bandwidth result from direct impact excitation of H and H2 by charged particles accelerated along magnetic field lines, while the thermal infrared emission involves additional steps in order to produce hot H3+ from the auroral energy. Each spectral window presents its own advantages. The high spatial and temporal resolution of the recent UV images obtained with HST make it possible to discriminate auroral sub-structures, such as short lived arcs and spots, and to map them into the magnetosphere where they can be associated with in situ observations. Infrared high resolution spectroscopy and emission-line imaging from ground observatories (IRTF, UKIRT) have more modest spatial resolution; however they recently pinned down emissions barely observed in the UV. Furthermore, they offer a direct measurement of the ion wind velocities in the auroral ionosphere. These ion flow patterns might then be used to untangle the origin of the auroral particles. The complementarity of observations obtained in the UV and IR bandwidths provides a powerful tool to study the auroral mechanisms in the Kronian magnetosphere and the atmospheric response to the auroral input. [less ▲]

Detailed reference viewed: 17 (7 ULg)
See detailThe Degree of Correlation of Jovian and Saturnian Auroral Emissions With Solar Wind Conditions
Clarke, J. T.; Nichols, J.; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

While the terrestrial aurorae are known to be driven primarily by the interaction of the Earth's magnetosphere with the solar wind, auroral emissions on Jupiter and Saturn are thought to be driven ... [more ▼]

While the terrestrial aurorae are known to be driven primarily by the interaction of the Earth's magnetosphere with the solar wind, auroral emissions on Jupiter and Saturn are thought to be driven primarily by internal processes, with the main energy source being the planets' rapid rotation. Limited evidence has suggested there might be some influence of the solar wind on Jupiter's aurorae, and indicated that auroral storms on Saturn can occur at times of solar wind pressure increases. To investigate in detail the dependence of auroral processes on solar wind conditions, a large campaign of observations of these planets has been undertaken using the Hubble Space Telescope, in association with measurements from planetary spacecraft and solar wind conditions both propagated from one AU and measured near each planet. The data indicate a consistent brightening of both the auroral emissions and Saturn Kilometric Radiation (SKR) at Saturn close in time to the arrival of solar wind shocks and pressure increases, consistent with a direct physical relationship between Saturnian auroral processes and solar wind conditions. This correlation has been strengthened by the final campaign observations in Feb. 2008. At Jupiter the situation is less clear, with increases in total auroral power seen near the arrival of solar wind forward shocks, while little increase has been observed near reverse shocks. In addition, auroral dawn storms have been observed when there was little change in solar wind conditions. The data are consistent with some solar wind influence on some Jovian auroral processes, while the auroral activity also varies independently of the solar wind. This extensive data set will serve to constrain theoretical models for the interaction of the solar wind with the magnetospheres of Jupiter and Saturn. [less ▲]

Detailed reference viewed: 55 (8 ULg)
See detailLong-term Brightness Variations of the Io UV Footprint
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2008, December 01)

Since the finding of the UV Io footprint in 1996, the successive UV instruments on board the Hubble Space Telescope (HST) allowed us to considerably improve the understanding of the Io-Jupiter electro ... [more ▼]

Since the finding of the UV Io footprint in 1996, the successive UV instruments on board the Hubble Space Telescope (HST) allowed us to considerably improve the understanding of the Io-Jupiter electro-magnetic interaction and its auroral counterpart. It has been shown that the Io footprint is generally formed by one bright spot preceded or followed by secondary spots whose relative positions are linked to the location of Io in the plasma torus. We also know that these spots experience brightness variations from minutes to hours. The Io footprint brightness varies over hours with the longitude of Io in the Jovian magnetic field (System III longitude) but until recently, huge gaps existed in the longitude coverage. Part of these gaps has now been filled during the latest HST imaging campaign and a more complete spot brightness versus Io System III longitude diagram emerges. Additionally, we compare spot brightness between images obtained a few minutes apart but from opposite hemispheres. Based on images gathered from 1997 to 2007 with the STIS and the ACS cameras, we also show that the footprint morphology and the spots brightness, including their relative brightness, can vary significantly from one year to another. Finally, we discuss the brightness variations from hours to years in terms of plasma torus density and position of Io in the plasma torus as well as in Jovian magnetic field. [less ▲]

Detailed reference viewed: 30 (5 ULg)
See detailEnjeux et conditions de l'enseignement des langues dans les universités
Defays, Jean-Marc ULg

Conference (2008, December)

Detailed reference viewed: 9 (2 ULg)
See detailIsothermal titration calorimetry as a tool for improving enzymatic lignocellulose hydrolysis
Razafindralambo, Hary ULg; Boquel, Pascal; Jacquet, Nicolas ULg et al

Conference (2008, December)

Detailed reference viewed: 21 (9 ULg)
See detailDevelopment of products for GNSS users at the Belgian Solar-Terrestrial Centre of Excellence
Warnant, René ULg; Lejeune, Sandrine; Stankov, Stanimir et al

Conference (2008, December)

Detailed reference viewed: 112 (22 ULg)
See detailLindane et goudron dans les shampoings: quelle toxicité ?
Theunis, Laetitia ULg

Conference (2008, December)

Detailed reference viewed: 16 (3 ULg)
Full Text
See detailTowards Another Summer
Delrez, Marc ULg

Conference (2008, November 28)

Detailed reference viewed: 5 (0 ULg)
See detailStimuli responsive nanogels for targeted drug delivery
Jérôme, Christine ULg

Conference (2008, November 28)

Detailed reference viewed: 10 (2 ULg)
See detailDesign of thermoresponsive inorganic nanoparticles
Aqil, Abdelhafid ULg; Jérôme, Christine ULg

Conference (2008, November 28)

Detailed reference viewed: 15 (4 ULg)
Full Text
See detailDesign of perfluorinated macroligand for the implementation of atom transfer radical polymerization in supercritical carbon dioxide
Grignard, Bruno ULg; Jérôme, Christine ULg; Calberg, Cédric ULg et al

Conference (2008, November 28)

Due to an increasing need for polymers with well-defined architecture (diblock-, graft-, star-shaped copolymers), molecular weight and/or functional end-groups, the use of controlled radical ... [more ▼]

Due to an increasing need for polymers with well-defined architecture (diblock-, graft-, star-shaped copolymers), molecular weight and/or functional end-groups, the use of controlled radical polymerization (CRP) in scCO2 has started to gain attention. Among all the controlled processes, Atom Transfer Radical Polymerization has emerged as a robust tool for the preparation of polymers with well-defined molecular weight, architecture and chain-end functionality. The goal of the research relies on the development of ATRP of vinyl monomers in scCO2. Perfluorinated polymethacrylate, i.e. poly2,2,2-trifluoroethyl methacrylate (PFMA), was successfully prepared by homogenous ATRP using a polymeric ligand in order to complex the copper catalyst. CO2-soluble poly(2,2,2-trifluoroethylmethacrylate) was also prepared in supercritical CO2 by supported ATRP using a “pseudo-homogeneous” catalyst consisting of copper (I) ligated by macroligand immobilized onto an inorganic support, that results in polymers with well defined molecular weight and low polydispersity. The first efficient dispersion ATRP of methyl methacrylate (MMA) in scCO2 using a fluorinated polymeric ligand that had a dual role, i.e., the complexation of the copper salt and the stabilization of PMMA growing particles was also reported and the concept of dispersion ATRP was extended to the dispersion ATRP of styrene, to the synthesis of diblock copolymers beads using PMMA beads as macroinitiators, leading to (co)polymers with predictable molecular weight and narrow polydispersity. Finally, because both ATRP and alkyne-azide Huisgen’s 1,3-dipolar cycloaddition relies on the use of a Cu(I) catalyst, synthesis of pyrene end-functionalized polymers by simultaneous dispersion ATRP and click reaction was also investigated in supercritical carbon dioxide, leading to the formation of PMMA of well defined characteristics that was collected as fluorescent micropheres. [less ▲]

Detailed reference viewed: 39 (6 ULg)