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See detailLichens et champignons lichénicoles nouveaux ou intéressants pour la flore de Belgique et des régions voisines. VII.
van den Boom, Pieter; Diederich, Paul; Sérusiaux, Emmanuël ULg

in Bulletin de la Société des Naturalistes Luxembourgeois (1996), 97

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See detailLes lichens foliicoles: concept, classification écologique et position systématique
Sérusiaux, Emmanuël ULg

in Naturalistes Belges (Les) (1977), 58

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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 formalisms in flexible multibody dynamics
Bruls, Olivier ULg

Conference (2013, September)

This course presents a recently-developed Lie group approach for the analysis of flexible multibody systems with large rotations and kinematic constraints in a parameterization-free setting. More ... [more ▼]

This course presents a recently-developed Lie group approach for the analysis of flexible multibody systems with large rotations and kinematic constraints in a parameterization-free setting. More precisely, the equations of motion are formulated as differential-algebraic equations (DAE) on a matrix Lie group and are then solved using a Lie group time integration method. Based on a nonlinear finite element approach, the lecture shows how the kinematics of a flexible multibody system, including the description of nodal frames, velocity fields, constraints, and flexible bodies, are described in the Lie group framework. The general structure of the equations of motion are derived from the Hamilton principle in a general and unifying approach. A Lie group generalized-alpha time integration scheme is proposed for DAEs on a Lie group and practical implementation issues are discussed. Finally, semi-analytical algorithms for sensitivity analysis on a Lie group are proposed for optimization purpose. The theoretical concepts and the numerical properties of the algorithms are illustrated with a number of examples. [less ▲]

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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)

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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: 29 (5 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

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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 ▲]

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See detailLiège à la veille de 1914: entre France et Allemagne...
Lanneau, Catherine ULg

in Maréchal, Christine; Schloss, Claudine (Eds.) 1914-1918: vivre la guerre à Liège et en Wallonie (2014)

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See detailThe Liege Acromegaly Survey (LAS) : A new software tool for the study of acromegaly
PETROSSIANS, Patrick ULg; Tichomirowa, M; Stevenaert, Achille ULg et al

in Annales d'Endocrinologie (2012), 73

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See detailLiège Acromegaly Survey (LAS): First snapshot
Petrossians, Patrick ULg; Chanson, P.; Sievers, C. et al

in European Neuroendocrine Association - Liège, 22-25 septembre 2010 (2010, September)

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See detailThe Liège Acromegaly Survey
Tichomirova, M.; Daly, Adrian ULg; Petrossians, Patrick ULg et al

in 23ème Congrès de la Société Française d'Endocrinologie - Abstract book (2006)

Detailed reference viewed: 10 (2 ULg)