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See detailLIBS : Identification rapide de composants chimiques. Application au recyclage des matériaux et détection de pollution du sol
Georges, Marc ULg

Conference (2011, May 13)

La technique LIBS (Laser Induced Breakdown Spectroscopy) permet une analyse rapide in situ des éléments chimiques sans préparation de l'échantillon. La LIBS consiste à illuminer un échantillon à analyser ... [more ▼]

La technique LIBS (Laser Induced Breakdown Spectroscopy) permet une analyse rapide in situ des éléments chimiques sans préparation de l'échantillon. La LIBS consiste à illuminer un échantillon à analyser avec une impulsion laser nanoseconde et concentrée par un système optique. Il en résulte la production en surface du matériau d'un plasma qui émet de la lumière dont le contenu spectral est ensuite analysé à distance. La LIBS a diverses applications dans le secteur de l'environnement. Dans la présentation, nous mettons en avant les applications dans la recherche de polluants ainsi que la possibilité de trier les vitrocéramiques dans les déchets verriers. Cette dernière application a été mise au point par le Centre Spatial de Liège avec le support financier de FOST Plus. [less ▲]

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See detailLicéité des baux au regard de la police de l'aménagement du territoire et de l'urbanisme
Delnoy, Michel ULg

in Actualités Juridiques des Baux (1999)

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See detailLa licéité des procédures conventionnelles en récusation d'arbitres
Caprasse, Olivier ULg

in Journal des Tribunaux (2012), (6476), 334-336

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See detailLicet et subjonctif, verbe ou conjonction ? seconde enquête
Purnelle, Gérald ULg

in Moussy, Claude (Ed.) De Lingua Latina Novae Questiones, Actes du Xe Colloque International de linguistique latine (Paris-Sèvres, 19-23 avril 1999) (2001)

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See detailThe lichen genus Pertusaria (Ascomycota) in Central Africa (Congo/Kivu, Rwanda and Burundi) and Western Kenya
Archer, Alan W.; Elix, John A.; Fischer, Eberhard et al

in Nova Hedwigia (2009), 88(3-4), 309-333

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See detailThe lichen genus Porina in Macaronesia, with description of two new species
Sérusiaux, Emmanuël ULg; Berger, Franz; Brand, Maarten et al

in Lichenologist (2007), 39

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See detailLe lichen sclereux vulvaire
Gillard, Patricia ULg; Vanhooteghem, Olivier ULg; Richert, Bertrand ULg et al

in Revue Médicale de Liège (2005), 60(7-8), 656-660

Vulvar lichen sclerosus is a frequent mucocutaneous disease especially affecting 50 to 60 year-old women but with a possible onset at very young age. Symptoms are most disabling including pruritus and ... [more ▼]

Vulvar lichen sclerosus is a frequent mucocutaneous disease especially affecting 50 to 60 year-old women but with a possible onset at very young age. Symptoms are most disabling including pruritus and dyspareunia. Vulvar mucosa gradually becomes more white and atrophied. Degeneration into epidermoid carcinoma is possible. Treatment only consists of topical corticosteroids. [less ▲]

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See detailLichenometric application to recent dynamics and sediment transport of a Corsican stream (Figarella River– France).
Gob, Frédéric ULg; Petit, François ULg; Bravard, J. P. et al

in Quaternary Science Reviews (2003)

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See detailHet Licht van Vlaanderen
Hendrickx, Kim ULg

Article for general public (2012)

A metaphorical reflection on police control in Flanders, and the creation of a suspicious Other

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See detailLiDAR derived ecological integrity indicators for riparian zones: Application to the Houille river in Southern Belgium/Northern France
Michez, Adrien ULg; Piégay, Hervé; Toromanoff, François ULg et al

in Ecological Indicators (2013), 34(0), 627-640

Riparian zones are central landscape features providing several ecosystem services and are exceptionally rich in biodiversity. Despite their relatively low area coverage, riparian zones consequently ... [more ▼]

Riparian zones are central landscape features providing several ecosystem services and are exceptionally rich in biodiversity. Despite their relatively low area coverage, riparian zones consequently represent a major concern for land and water resource managers confirmed within several European directives. These directives involve effective multi-scale monitoring to assess their conditions and their ability to carry out their functions. The objective of this research was to develop automated tools to provide from a single aerial LiDAR dataset new mapping tools and keystone riparian zone attributes assessing the ecological integrity of the riparian zone at a network scale (24 km reach). Different metrics were extracted from the original LiDAR point cloud, notably the Digital Terrain Model and Canopy Height Model rasters, allowing the extraction of riparian zones attributes such as the wetted channel (0.89 m; mean residual) and floodplain extents (6.02 m; mean residual). Different riparian forest characteristics were directly extracted from these layers (patch extent, overhanging character, longitudinal continuity, relative water level, mean and relative standard deviation of tree height). Within the riparian forest, the coniferous stands were distinguished from deciduous and isolated trees, with high accuracy (87.3 %, Kappa Index). Going further the mapping of the indicators, our study proposed an original approach to study the riparian zone attributes within different buffer width, from local scale (50 m long channel axis reach) to a network scale (ca 2 km long reaches), using a disaggregation/re-agraggation process. This novel approach, combined to graphical presentations of the results allow natural resource managers to visualise the variation of upstream-downstream attributes and to identify priority action areas. In the case study, results showed a general decrease of the riparian forests when the river crosses built-up areas. They also highlighted the lower flooding frequency of riparian forest patches in habitats areas. Those results showed that LiDAR data can be used to extract indicators of ecological integrity of riparian zones in temperate climate zone. They will enable the assessment of the ecological integrity of riparian zones to be undertaken at the regional scale (13000 km, completely covered by an aerial LIDAR survey in 2013). [less ▲]

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See detailLe LiDAR-t et la photogrammétrie pour modéliser des troncs irréguliers
Bauwens, Sébastien ULg

Scientific conference (2013, October 08)

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See detailLie group generalized-alpha time integration of constrained flexible multibody systems
Bruls, Olivier ULg; Cardona, Alberto; Arnold, Martin

in Mechanism & Machine Theory (2012), 48

This paper studies a Lie group extension of the generalized-alpha time integration method for the simulation of flexible multibody systems. The equations of motion are formulated as an index-3 ... [more ▼]

This paper studies a Lie group extension of the generalized-alpha time integration method for the simulation of flexible multibody systems. The equations of motion are formulated as an index-3 differential-algebraic equation (DAE) on a Lie group, with the advantage that rotation variables can be taken into account without the need of introducing any parameterization. The proposed integrator is designed to solve this equation directly on the Lie group without index reduction. The convergence of the method for DAEs is studied in detail and global second-order accuracy is proven for all solution components, i.e. for nodal translations, rotations and Lagrange multipliers. The convergence properties are confirmed by three benchmarks of rigid and flexible systems with large rotation amplitudes. The Lie group method is compared with a more classical updated Lagrangian method which is also formulated in a Lie group setting. The remarkable simplicity of the new algorithm opens interesting perspectives for real-time applications, model-based control and optimization of multibody systems. [less ▲]

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See detailLie group integrators for the numerical solution of DAE’s in flexible multibody dynamics
Cardona, Alberto; Bruls, Olivier ULg; Arnold, Martin

Conference (2010, November)

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See detailLie group vs. classical time integrators in multibody dynamics: Formulations and numerical benchmarks
Bruls, Olivier ULg; Cardona, Alberto

Conference (2009, September)

The dynamics of flexible multibody systems with large rotations is often described using large sets of index-3 differential-algebraic equations. In this context, the Lie group structure of the dynamic ... [more ▼]

The dynamics of flexible multibody systems with large rotations is often described using large sets of index-3 differential-algebraic equations. In this context, the Lie group structure of the dynamic system may be exploited in order to provide an elegant solution to the rotation parameterization problem. The talk discusses an original Lie-group extension of the classical generalized-alpha method, which can be used to solve index-3 differential-algebraic equations in multibody dynamics. Second-order accuracy is demonstrated at least in the unconstrained case and the performance is illustrated on several critical benchmarks with high rotational speeds. The remarkable simplicity of the new algorithms opens some interesting perspectives for real-time applications, model-based control and optimization of multibody systems. [less ▲]

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See detailLiebe und Tod in sommerlichen Gärten Erzählungen von Eduard von Keyserling
Pontzen, Alexandra ULg

in Literaturkritik.de (2005)

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See detailLiège
George, Philippe ULg

in Dictionnaire d’Histoire de l’art du Moyen Age occidental (2009)

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See detailLiège 1866-1991 : Mutations d’un espace urbain
Frankignoulle, Pierre ULg

in Gagnez (1991)

Detailed reference viewed: 42 (7 ULg)
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See detailLiège 2017: Connectez-vous
Brandt, Céline ULg

Article for general public (2012)

Le comité de Liège Expo 2017 a pris le parti de faire de la connectivité sa thématique phare: 4 scientifiques s'expriment au sujet de la connectivité.

Detailed reference viewed: 21 (4 ULg)
See detailLiège : site - évolution récente et perspectives…
Merenne-Schoumaker, Bernadette ULg

in De Saint-Lambert… au Pays de Liège, De septembre 705 à septembre 2005 (2005)

Courte présentation grand public sur le site de Liège, son évolution depuis 1950 et ses perspectives pour le futur

Detailed reference viewed: 8 (0 ULg)
See detailLiège : Territoires, Economie et Société (1960-2008)
Merenne-Schoumaker, Bernadette ULg

in Demoulin, Bruno (Ed.) Liège et le Palais des Princes-Evêques (2008)

Pour traduire la diversité des territoires, celle des hommes qui y vivent et des activités qui s’y sont développées, nous avons choisi une démarche par systèmes emboîtés depuis le quartier du palais ... [more ▼]

Pour traduire la diversité des territoires, celle des hommes qui y vivent et des activités qui s’y sont développées, nous avons choisi une démarche par systèmes emboîtés depuis le quartier du palais jusqu’à l’Euregio Meuse-Rhin (EMR). Ce cheminement, ponctué de nombreuses cartes, devrait permettre de découvrir les multiples facettes des mondes liégeois. [less ▲]

Detailed reference viewed: 15 (4 ULg)