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See detailModélisation des grands systèmes chimiques: travaux pratiques
Gerkens, Carine; Leruth, Alexandre; Léonard, Grégoire ULg et al

Learning material (2012)

Notes de Travaux pratiques à l'attention des étudiants 1ere master ingénieur civil chimiste et sciences des matériaux

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See detailModélisation des impacts des changements climatiques sur les ressources en eaux souterraines
Dassargues, Alain ULg

Scientific conference (2004, March 15)

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See detailModélisation des impacts des changements climatiques sur les ressources en eaux souterraines
Dassargues, Alain ULg

Scientific conference (2004, March 17)

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Peer Reviewed
See detailModélisation des mouvements aérodynamiques générés par le chauffage en culture protégée.
Aubinet, Marc ULg; Deltour, Jules; Nijskens, J.

in Bulletin des Recherches Agronomiques de Gembloux (1991), 26(1), 39-58

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See detailModélisation des occupations biophysiques du sol issues des traitements d'images XS de Spot : exemple de l'agglomération de Luxembourg
Nadasdi, Istvan; Marchal, Denis; Binard, Marc ULg

in Actes CNES " Conférence internationale d'une décennie de réalisations ... à une décennie de promesses" (1996)

Many phenomena, especially physical ones are by nature continuous. Others, although discrete, can be transformed in statistical surfaces by means of potential functions. The construct generated in this ... [more ▼]

Many phenomena, especially physical ones are by nature continuous. Others, although discrete, can be transformed in statistical surfaces by means of potential functions. The construct generated in this way from land cover maps allow the quantitative, qualitative and geographic study of the phenomenon. It is advantageous to consider these statistical surfaces as geographical models. This is particularly true of urban potential surface. The potential fields are new generalised bands and can be utilised for realisation of color composite images called “colorama”. Further the potential fields allow to form a synthetic image which can by submitted to an automatic classification. The result is a chloropleth map of ecological landscape units. [less ▲]

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See detailModélisation des phénomènes thermomécaniques dans une lingotière de coulée continue
Pascon, Frédéric ULg; Habraken, Anne ULg; Bourdouxhe, M. et al

in Mécanique & Industries (2000), 1

Modelling of the thermomechanical phenomena in a mould of continuous casting. The surface and internal quality of continuous cast products depends very much on the behaviour of the strand in the mould ... [more ▼]

Modelling of the thermomechanical phenomena in a mould of continuous casting. The surface and internal quality of continuous cast products depends very much on the behaviour of the strand in the mould during solidification. Among the parameters likely to influence this behaviour, the mould taper takes a prominent part. We developed a thermomechanical 2D model of the strand in the mould using the finite element code LAGAMINE. A slice of the strand is defined perpendicularly to the casting axis with the following boundary conditions: symmetry with principal axes of the section (double symmetry), frictional unilateral contact with the mould surface and imposed mould temperature. The approach uses the generalised plane strain state that allows a variable thickness of the slice in time, and provides one equation for the vertical force equilibrium. The ferrostatic pressure is also taken into account. Due to the mould taper, the geometry of the mould is not constant, but varies as the slice is moving down. The thermal exchange conditions are also modified, depending on contact condition between the strand and the mould. After a two years work, the model is now in checking to predict behaviour of the strand in different cases (shape of the strand cross section, mould taper, etc.). [less ▲]

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See detailModélisation des réflexions diffuses en acoustique des salles: état de la question
Embrechts, Jean-Jacques ULg

in Actes du 6è Congrès Français d'Acoustique (2002)

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See detailModélisation des ressauts en ruissellement hydrologique quasi-tridimensionnel sur terrains quelconques
Pirotton, Michel ULg

in "Hydraulic Research and its Application in the next century, Vol 1: Integration of Research approaches and applications (1995)

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See detailModélisation des systèmes biologiques
Dauby, Pierre ULg

Learning material (2009)

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See detailModélisation des tensions circonférentielles en simulation méridienne d'écoulements en turbomachines
Thomas, Jean-Philippe ULg

Doctoral thesis (2012)

The systematic use of three-dimensional Navier-Stokes simulations being too demanding in turbomachinery design phase, throughflow simulation, two-dimensional, simpler and faster, is used extensively on an ... [more ▼]

The systematic use of three-dimensional Navier-Stokes simulations being too demanding in turbomachinery design phase, throughflow simulation, two-dimensional, simpler and faster, is used extensively on an industrial scale. However, its limitation is its need for empirical information to reproduce the action of the blades and the effect of three-dimensional components of the flow, higher-order elements compared to the classical throughflow. We propose to lead to a decrease of empiricism needed by the classical throughflow by obtaining this information autonomously. Obtaining information of a circumferential order may be considered in resolving all the components of the flow with a purely three-dimensional code or by accommodating an approximate solution with a reduced numerical cost, the way chosen in this contribution. To do this, we propose to extend to the circumferential case the He's "nonlinear harmonic method", of proved efficiency in the case of approximate reproduction of unsteadiness. Adapting this technique to the throughflow model passes through a reformulation of the presence of blades. Indeed, the use of Fourier series requires a continuous circumferential evolution of flow, prohibiting the existence of local impermeability condition. To work around this feature of the circumferential case, the effect of the blades is modeled by a force field sufficiently continuous and formalized by the Peskin's "immersed boundary method". The validation of the new technique, resulting from an innovative combination of the harmonic and immersed boundary methods inside a throughflow code, is performed on the case of inviscid flow around a cylinder. It illustrates the capabilities of the harmonic throughflow to access higher order information, that enrich the mean flow but also make available the circumferential view of the flow from the Fourier modes resolved. Finally, the harmonic throughflow is applied to a stator airfoil and a single-stage compressor. It is shown that after adjusting the model to the specific geometry of thin profiles, it is possible to access information of higher order. In particular, the model captures the potential characteristics of circumferential non-uniformities on the entire vein and the viscous characteristics near meridional walls. [less ▲]

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See detailModélisation déterministe des écoulements et du transport de contaminants pour la détermination des zones de protection en Belgique
Dassargues, Alain ULg; Hallet, Vincent

in Milieux poreux et transferts hydriques - Bulletin du Groupe Francophone Humidimétrie et Transferts en Milieux Poreux, Strasbourg (2000)

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See detailModélisation du bilan de masse de surface Antarctique : quelle stratégie et quelle validation ?
Agosta, Cécile ULg; Favier, Vincent; Fettweis, Xavier ULg et al

Conference (2013, January)

Le bilan de masse de surface (BMS) Antarctique est encore mal connu, bien qu'on sache qu'il contribue de façon significative à l'évolution actuelle du niveau des mers et que sa contribution soit supposée ... [more ▼]

Le bilan de masse de surface (BMS) Antarctique est encore mal connu, bien qu'on sache qu'il contribue de façon significative à l'évolution actuelle du niveau des mers et que sa contribution soit supposée s'intensifier au cours des prochains siècles. Outre son effet direct sur le niveau des mers, le BMS est également un champs de forçage primordial pour les modèles de calotte. Enfin, alors qu'il existe des mesures directes de l'écoulement de la glace vers l'océan et des variations de masse totales (surface+écoulement) de la calotte, il n'existe pas de mesure directe du bilan de masse de surface à l'échelle du continent. La climatologie actuelle du BMS Antarctique est donc estimée principalement à partir de résultats de modélisation. Il est donc crucial de modéliser correctement le bilan de masse de surface Antarctique. Or cette modélisation n'est pas aisée, car il existe peu de modèles de climat, globaux ou régionaux, dont la physique soit appropriée pour modéliser l'atmosphère sur des surfaces englacées. De plus, la résolution a une influence importante sur la représentation du BMS, ce qui oblige à faire des compromis entre résolution et complexité des modèles pour conserver des coûts de calcul raisonnables. Nous présentons la méthodologie que nous avons adoptée pour modéliser le BMS Antarctique sur plusieurs siècles et à haute résolution. Elle s'appuie sur une cascade de modèles adaptés aux conditions polaires à différentes échelles. Nous nous penchons également sur l'épineux problème de l'évaluation du BMS modélisé à partir de données de terrain. En effet, un effort important a été réalisé pour répertorier les données de BMS de qualité en Antarctique, mais ces données restent éparses et échantillonnent mal le continent. L'utilisation d'autres types de données, satellites ou aéroportées par exemple, semble nécessaire et nous ferons un état des lieux des limitations qui restent à dépasser pour y parvenir. [less ▲]

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