References of "Scientific congresses and symposiums"
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See detailTransient drop behaviour of single drops in reactive extraction
Kalem, Murat; Pfennig, Andreas ULg

Conference (2008)

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See detailTests and design of stainless steel lipped channel section columns
Rossi, Barbara ULg; Rondal, Jacques ULg; Cescotto, Serge ULg et al

in European conference on steel and composite structures : Eurosteel2008, Gratz 3-5 September 2008 (2008)

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See detailGeneration of arbitrary Dicke states in remote qubits using linear optics
Maser, A.; Thiel, C.; Schilling, U. et al

Conference (2008)

Detailed reference viewed: 1 (0 ULg)
See detailAspects fiscaux du droit de la famille
Bourgeois, Marc ULg

Conference (2008)

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See detailDEVELOPMENT OF AN INTRAPERITONEAL IMPLANT FOR THE ENDOMETRIOSIS TREATMENT
Krier, Fabrice ULg; Nizet, Dominique; Riva, Raphaël ULg et al

Poster (2008)

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See detailProduction of alarm pheromone by developing aphids varies in response to their social environment
Verheggen, François ULg; Haubruge, Eric ULg; Demoraes, Consuelo et al

Poster (2008)

Aphid alarm pheromone—the volatile sesquiterpene (E)-β-farnesene (Eβf) in most species—is released in response to predation and other stresses and typically causes nearby aphids who receive the signal to ... [more ▼]

Aphid alarm pheromone—the volatile sesquiterpene (E)-β-farnesene (Eβf) in most species—is released in response to predation and other stresses and typically causes nearby aphids who receive the signal to cease feeding, drop from their host plant, and disperse. Because aphid alarm pheromone confers apparent fitness benefits on recipients while its production and release likely entail costs for the emitting aphid, it could be adaptive for aphids to regulate their Eβf production in response to variation in the social environment. To explore this possibility we compared the production of Eβf by Acyrthosiphon pisum (Harris) individuals reared from first-instar larvae to the adult stage in isolation to that of individuals reared among conspecifics or among individuals of a different aphid species, Myzus persicae (Sulzer). Levels of EβF produced in each treatment were assayed by GC-FID quantification of EβF in volatiles collected from crushed aphids. Production of EβF by A. pisum reared in isolation (14.4ng/aphid) was significantly lower than that of aphids reared in a colony of conspecifics (49.1ng/aphid), reared in a M. persicae colony (31.5ng/aphid) or reared among conspecifics of another aaphid clone (52.7ng/aphid). Though A. pisum individuals in our experiments produced less EβF when reared among M. persicae than among conspecifics, this difference was not statistically significant. In a separate experiment we reared A. pisum individuals in isolation and exposed them to the odor of conspecifics. Under these conditions, EβF production was similar to that of aphids reared among conspecifics, suggesting that aphids use volatile cues to assess their social environment and regulate their production of alarm pheromone accordingly. [less ▲]

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See detailGeneration of symmetric Dicke states
Thiel, C.; von Zanthier, J.; Bastin, Thierry ULg et al

Poster (2008)

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See detailTransfer in interlanguage phonology: the case of prosody
Rasier, Laurent ULg

Conference (2008)

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See detailVariable selection for dynamic treatment regimes: a reinforcement learning approach
Fonteneau, Raphaël ULg; Wehenkel, Louis ULg; Ernst, Damien ULg

Conference (2008)

Dynamic treatment regimes (DTRs) can be inferred from data collected through some randomized clinical trials by using reinforcement learning algorithms. During these clinical trials, a large set of ... [more ▼]

Dynamic treatment regimes (DTRs) can be inferred from data collected through some randomized clinical trials by using reinforcement learning algorithms. During these clinical trials, a large set of clinical indicators are usually monitored. However, it is often more convenient for clinicians to have DTRs which are only defined on a small set of indicators rather than on the original full set. To address this problem, we analyse the approximation architecture of the state-action value functions computed by the fitted Q iteration algorithm - a RL algorithm - using tree-based regressors in order to identify a small subset of relevant ones. The RL algorithm is then rerun by considering only as state variables these most relevant indicators to have DTRs defined on a small set of indicators. The approach is validated on benchmark problems inspired from the classical ‘car on the hill’ problem and the results obtained are positive. [less ▲]

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See detailTowards high performance virtual routers on commodity hardware
Egi, N.; Greenhalgh, A.; Handley, M. et al

in Proceedings of the 2008 ACM CoNEXT Conference (2008)

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See detailHistoires parallèles de la sculpture moderne
Bawin, Julie ULg

Conference (2008)

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See detailMulti-Step toolpath approach to overcome forming limitations in single point incremental forming
Verbert, J.; Belkassem, B.; Henrard, Christophe ULg et al

in Boisse, P. (Ed.) Proceedings of the 11th International ESAFORM Conference on Material Forming (2008)

Although Incremental Forming offers distinct advantages over traditional forming processes, such as short lead times and low setup costs, the process still has some drawbacks. Besides the obtainable ... [more ▼]

Although Incremental Forming offers distinct advantages over traditional forming processes, such as short lead times and low setup costs, the process still has some drawbacks. Besides the obtainable accuracy, one of the main challenges of the process are the process limits. Many workpiece geometries cannot be manufactured due to the fact that the maximum wall angle that can be formed is limited for a certain sheet material and thickness to a given angle. Different solutions to this approach have been proposed and this paper further investigates one of those solutions, the multi step approach for single point incremental forming. Experiments were performed and compared with simulations to better understand the phenomena underlying the improved process performance. [less ▲]

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See detailLes figures de bourgeois dans le Roman de Guillaume d’Orange en prose
Henrard, Nadine ULg

in Moreno, Paola; Palumbo, Giovanni (Eds.) Autour du XVe siècle. Journées d'étude en l'honneur d'Alberto Vàravaro. (Liège, 10-11 mai 2004) (2008)

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See detailLes dédicaces latines des motets et "Sacrae Cantiones" de René del Mel
Corswarem, Emilie ULg

in Bossuyt, Ignace; Gabriëls, Nele; Sacré, Dirk (Eds.) et al Cui dono lepidum novum libellum ? Dedicating Latin Works and Motets in the Sixteenth Century Theory and Practice (2008)

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See detailLa peinture murale à Liège au XVIe siècle : analyse technologique d'une peinture de la cathédrale Saint-Paul de LIège
Oger, Cécile ULg; Denoël, Sophie; Strivay, David ULg et al

in Denoël, Sophie (Ed.) Les peintures murales. Les techniques (2008)

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See detailBackground considerations on masonry structures for the preparation of the Belgian national annex to Eurocode 8
Degée, Hervé ULg; Plumier, André ULg

in Proceedings of the Conference "Seismic Risk - Earthquake in North-Western Europe" (2008)

This contribution summarizes considerations developed to allow a reasonable and consistent definition of the national parameters to be introduced in the Belgian national annex to chapter 9 of Eurocode 8 ... [more ▼]

This contribution summarizes considerations developed to allow a reasonable and consistent definition of the national parameters to be introduced in the Belgian national annex to chapter 9 of Eurocode 8 dealing with seismic design of masonry structures. The different aspects considered are material properties (resistance and ductility), detailing of wall-wall and wall-floor connections and rules for simple masonry buildings. The result is a set of rules consistent with the national practice and defining (i) what is allowed in Belgium for the different seismic zones, (ii) minimal requirements for simple non-engineered buildings and (iii) a procedure that can be followed to improve these rules for materials and structural systems exhibiting better properties than the minimal requirements of Eurocode 8. [less ▲]

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See detailPotential implication of host/symbiont recognition mechanisms in coral bleaching
Vidal-Dupiol, Jérémie; Mitta, Guillaume; Roger, Emmanuel et al

Poster (2008)

Bleaching in corals can be attributed to loss of endosymbiotic zooxanthellae and/or loss of photosynthetic pigments within zooxanthellae. This major disturbance of the reef ecosystem is principally ... [more ▼]

Bleaching in corals can be attributed to loss of endosymbiotic zooxanthellae and/or loss of photosynthetic pigments within zooxanthellae. This major disturbance of the reef ecosystem is principally induced by increases in water temperature. Since the beginning of the 80ís and the onset of global climate change, this phenomenon has been occurring at increasing rates and scales, and with increasing severity. In this study, we focused on finding early regulated genes involved in bleaching. In aquaria, one set of Pocillopora damicornis nubbins was subjected to a gradual seawater temperature increase from 28°C to 32°C over 15 days, and a second control set remained at constant temperature (28°C). Bleaching was monitored by measuring zooxanthellae density. The mRNA differentially expressed between the stressed state (sampled just before the onset of bleaching) and the non stressed state (control) were isolated from the nubbins by Suppression Subtractive Hybridization. The corresponding cDNA were sequenced and confronted to sequence databases to obtain gene similarities. Finally, transcription rates of the most interesting genes were conducted by Q-PCR. Two particularly interesting candidate genes showed an important decrease in their transcription rates following thermal stress and before zooxanthellae loss. These two genes show similarities with genes involved in host/symbiont and host/parasite models. The implication of these molecular actors suggests a possible role of recognition mechanisms between the host and its symbiont, in the breakdown of the symbiosis during the bleaching phenomenon. Experiments such as RACE-PCR, in situ hybridization and immunohistochemistry are currently underway to confirm our hypotheses. [less ▲]

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See detailAventures historiographiques. Contextes et stratégies d’interprétations métalittéraires
Provenzano, François ULg

in Houdebine, Anne-Marie; Klinkenberg, Jean-Marie (Eds.) Les aventures de l'interprétation (2008)

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See detailA PERIOD3 polymorphism predicts fMRI assessed brain responses following sleep loss
Vandewalle, Gilles ULg; Archer, Simon; Wuillaume, Catherine et al

in Sleep (2008), 31(Suppl. 1),

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See detailConsistency of fuzzy model-based reinforcement learning
Busoniu, Lucian; Ernst, Damien ULg; Babuska, Robert et al

in Proceedings of the 2008 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE-08) (2008)

Reinforcement learning (RL) is a widely used paradigm for learning control. Computing exact RL solutions is generally only possible when process states and control actions take values in a small discrete ... [more ▼]

Reinforcement learning (RL) is a widely used paradigm for learning control. Computing exact RL solutions is generally only possible when process states and control actions take values in a small discrete set. In practice, approximate algorithms are necessary. In this paper, we propose an approximate, model-based Q-iteration algorithm that relies on a fuzzy partition of the state space, and a discretization of the action space. Using assumptions on the continuity of the dynamics and of the reward function, we show that the resulting algorithm is consistent, i.e., that the optimal solution is obtained asymptotically as the approximation accuracy increases. An experimental study indicates that a continuous reward function is also important for a predictable improvement in performance as the approximation accuracy increases. [less ▲]

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See detailMechanical characterization of porous structures by the combined use of micro-CT and in-situ loading
Kerckhofs, Greet ULg; Schrooten, Jan; Elicegui, Laida et al

Conference (2008)

Detailed reference viewed: 13 (2 ULg)
See detailAIRE role in melanoma
Conteduca, Giuseppina ULg

Poster (2008)

Polymorphisms of AIRE, a transcription factor that up-regulates intrathymic expression of tissue-specific antigens including melanoma-associated antigens (MAAs), may variably affect the selection of MAAs ... [more ▼]

Polymorphisms of AIRE, a transcription factor that up-regulates intrathymic expression of tissue-specific antigens including melanoma-associated antigens (MAAs), may variably affect the selection of MAAs-specific thymocytes, generating T-cell repertoires protecting or predisposing individuals to melanoma. We found that AIRE single nucleotide polymorphisms (SNPs) rs1055311, rs1800520 and rs1800522 were significantly more frequent in healthy subjects than in melanoma patients, independently from sex, age and stages of melanoma. The presence of these SNPs was associated with increased frequency of two T-cell clonotypes specific for MAGE-1 linking their protective effect to selection/expansion of MAA-specific T cells. Interestingly, mRNA transcribed on the rs1800520 SNP showed increased free energy than the wild type suggesting that its reduced stability may be responsible for the different activity of the polymorphic AIRE molecule. This finding may contribute at identifying subjects with increased risk of developing melanoma or patients with melanoma that may take benefit from immunotherapy. [less ▲]

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See detailElectrophysiologic contribution to cervical pain
WANG, François-Charles ULg; TOMASELLA, Marco ULg

in Revue du Rhumatisme et des Maladies Osteo-Articulaires (2008)

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See detailBiomarkers of heart disease
Amory, Hélène ULg; Deleuze, Stefan ULg; Sandersen, Charlotte ULg

in Proceedings of the Second Resident Meeting of the European College of Equine Internal medicine (ECEIM) (2008)

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See detailRocking behaviour of prefabricated concrete frames subjected to earthquake action
Degée, Hervé ULg; Denoël, Vincent ULg

in Proceedings of ACOMEN 2008, Advanced Computational Methods in Engineering (2008)

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See detailApplication of an electromagnetic modeling method for railway grounding systems subjected to lightning strikes
Jacqmaer, P.; Geuzaine, Christophe ULg; Driesen, J.

in 13th International Conference on Harmonics and Quality of Power (ICHQP XIII) (2008)

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See detailEstimation de densité par ensemble aléatoire de poly-arbres
Ammar, Sourour; Leray, Philippe; Wehenkel, Louis ULg

(2008)

La notion de mélange de modèles simples aléatoires est de plus en plus utilisée et avec succès dans la littérature de l’apprentissage supervisé ces dernières années. Parmi les avantages de ces méthodes ... [more ▼]

La notion de mélange de modèles simples aléatoires est de plus en plus utilisée et avec succès dans la littérature de l’apprentissage supervisé ces dernières années. Parmi les avantages de ces méthodes, citons l’amélioration du passage à l’échelle des algorithmes d’apprentissage grâce à leur aspect aléatoire et l’amélioration de l’exactitude de la prédiction des modèles induits grâce à une flexibilité plus élevée en ce qui concerne le compromis biais/variance. Dans le présent travail, nous proposons d’explorer cette idée dans le contexte de l’estimation de la densité. Nous proposons une nouvelle famille de méthodes d’apprentissage non-supervisé à base de mélange de grands ensembles aléatoires de poly-arbres. La caractéristique spécifique de ces méthodes est leur passage à l’échelle, aussi bien en terme de nombre de variables que de données à traiter. Cette étude, exploratoire, compare empiriquement ces méthodes sur un ensemble de problèmes de test discrets de taille et de complexité croissantes et ouvre de nombreuses perspectives auxquelles nous prévoyons de nous intéresser. [less ▲]

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See detailFamilial pituitary tumors involving the Aryl Hydrocarbon Receptor Interacting Protein (AIP1)
Beckers, Albert ULg

in 11th International Workshop on Multiple Endocrine Neoplasia - Symposium 1 "Multiple Tumors and tje pituitary" - Abstract book (2008)

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See detailA new method for absolute quantification of allergens in food: the "Heavy Peptides method".
Fourdrilis, Séverine; Bourgeon, Cédric; Kirsch, Stéphanie ULg et al

Poster (2008)

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See detailDetailed 2D numerical modeling for flood extension forecasting
Erpicum, Sébastien ULg; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Proceedings of the 4th International Conference on Fluvial Hydraulics: River Flow 2008 (2008)

In the global framework of recurrent large flood events all over the world and in Europein particular, relevant and detailed inundation maps represent a tool of prime interest fordecision makers ... [more ▼]

In the global framework of recurrent large flood events all over the world and in Europein particular, relevant and detailed inundation maps represent a tool of prime interest fordecision makers, emergency services or insurance companies. In 2003 in Belgium, following a Regional Government decision, hydraulic 2D numerical modelling has been chosen to compute inundation maps on 800 km of the main rivers of the Walloon Region, using high resolution Digital Elevation Models. The present paper covers a detailed description of the state-of-the-art 2D finite volume model used to fulfil this task. As a part of this project, the model has been extensively validated by comparisons with observations during recent real flood events. It shows a very good agreement with observations, in particular regarding free surface elevations. Following this first step toward flood management, the Belgian National project “ADAPT” is presented. It aims to develop an efficient decision support tool for the integrated assessment ofadaptation measures against climate change induced flooding. In this scope, the model has been applied to predict inundations induced by floods, taking into account different climate change scenarios. The results of these simulations serve as input for a subsequent economic, social and ecological analysis by other scientific research teams. [less ▲]

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See detailL'économie céréalière : aspects prospectifs
Burny, Philippe ULg

Conference (2008)

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See detailThe influence of affective valence on false recognition in the DRM procedure.
Dehon, Hedwige ULg; Laroi, Frank ULg; Van der Linden, Martial

Poster (2008)

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See detailA mechanobioregulatory model for the study of bone fracture healing
Geris, Liesbet ULg; Gerisch, A.; Weiner, R. et al

in Proceedings of the European Conference on Mathematical and Theoretical Biology (2008)

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See detailA Perturbation Finite Element Method for Modeling Electrostatic MEMS without Remeshing
Boutaayamou, Mohamed ULg; V Sabariego, Ruth ULg; Dular, Patrick ULg

in Proceedings of the 9th International Conference on Thermal, Mechanical and Multiphysics Simulation and Experiments in Micro-Electronics and Micro-Systems (EuroSimE2008) (2008)

This paper deals with the coupled electrostatic- mechanical analysis of electrostatically actuated MEMS. An iterative perturbation procedure in conjunction with the finite element method is used to solve ... [more ▼]

This paper deals with the coupled electrostatic- mechanical analysis of electrostatically actuated MEMS. An iterative perturbation procedure in conjunction with the finite element method is used to solve the coupled problem without the need of remeshing the whole electric domain. The method offers the advantage of overcoming degenerated finite elements in the mesh of some electric regions where the deflection of the MEMS moving parts is critical. The actuation of such systems is achieved by applying either an electric voltage or a global charge. [less ▲]

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See detailInfluence of natural and synthetic peptides on biomimetic membranes
Kouzayha, Achraf; Wattraint Olivier; Nasir, Mehmet Nail ULg et al

Poster (2008)

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See detailOn the design of ferritic stainless steel lipped channel
Rossi, Barbara ULg; Degée, Hervé ULg

in International Conference on Coupled instabilities in metal structures: CIMS2008, Sydney 23-25 June 2008 (2008)

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See detailOn the complementarity of contrastive linguistics and interlanguage studies
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2008)

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See detailPrediction of the sound pressure levels using a diffusion model: numerical validations and experimental comparisons
Billon, Alexis ULg; Picaut, Judicaël

in Journal of the Acoustical Society of America (2008), 123(5), 3924-3924

redictions of sound propagation in urban areas have attracted a considerable over the years. If the sound energy is assimilated to particles with a constant energy, their movement can be described by a ... [more ▼]

redictions of sound propagation in urban areas have attracted a considerable over the years. If the sound energy is assimilated to particles with a constant energy, their movement can be described by a transport equation. In canyon streets, this transport equation can be reduced to a diffusion equation whose expression is more simple. In this presentation, sound absorption at the boundaries (buildings facades and ground), as well as atmospheric sound attenuation are introduced. The problem is then solved numerically using a finite elements method for the configuration of a canyon street. A systematic validation of the obtained model is carried out in terms of sound pressure level by comparison to numerical simulations taken from the literature. Comparisons with experimental data are then conducted. Finally, applications in more complex configurations are presented. [less ▲]

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See detailThe problem of the consumer may be the solution. Sustainable production from the consumers perspective: the emergence of the "Gaume grassland steer" in Belgium
Stassart, Pierre M ULg

in Stassart, Pierre M (Ed.) Proceedings of the "Sustainable Consumption Alternative Agrifood Systems (2008)

This paper examines the question of sustainable consumption through the consumer’s contribution to the various dimensions of sustainability. The consumer’s participation reveals legitimacy conflicts in ... [more ▼]

This paper examines the question of sustainable consumption through the consumer’s contribution to the various dimensions of sustainability. The consumer’s participation reveals legitimacy conflicts in the process of designing new production systems. The different dimensions of sustainability can be linked to different legitimacy models. When the building of new systems entails a concerted process involving dialogue and deliberation among stakeholders from the agricultural and environmental sectors, various legitimacy principles are mobilized and confront each other through the spokespeople who represent the interests involved. This specific case concerns beef produced from the ”Gaume grassland steer,” a system that can be characterized as agroecological and territorial. The consumers who were involved contributed, through deliberative processes, to the coexistence of various legitimacy principles and stakeholder cooperation. This capacity could be linked to their multiple and fuzzy identities because their identities were shown to be flexible, changing with the institutional setting, which was sometimes consumer-oriented and sometimes territory-driven. This allowed them to act as mediators between environmentalists and farmers. To do this they had to be able to accept the limits of each legitimacy principle and contest the possibility of imposing only one principle on all the others. In so doing they helped the heterogeneous actors to reach compromises by referring to a kind of patrimonial common good. [less ▲]

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See detailAn experimental analysis of effects induced by moving bodies in shallow water
Kerger, François ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Proc. 2nd International Junior Researcher and Engineer Workshop on Hydraulic Structures (2008)

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See detailA One-Phase Thermomechanical Constitutive Model for the Numerical Simulation of Semi-Solid Thixoforming
Koeune, Roxane ULg; Ponthot, Jean-Philippe ULg

in Proceedings of ESAFORM 2008, Conference on material forming (2008)

A thermo mechanical one-phase elasto-visco-plastic constitutive law has been developed in order to model thixoforming processes. The simulation of a simple academic 2D test has revealed the forces and ... [more ▼]

A thermo mechanical one-phase elasto-visco-plastic constitutive law has been developed in order to model thixoforming processes. The simulation of a simple academic 2D test has revealed the forces and weaknesses of the proposed model. [less ▲]

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See detailProfile of methylaion of tumour related genes in breast cancer in Tunisian women
Hachana, Mohamed Ridha ULg; Trimeche, Mounir; Ziadi, Sonia et al

in European Journal of Cancer (2008), 6(9), 195

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See detailVenus night airglow and implications for thermospheric composition and dynamics
Gérard, Jean-Claude ULg; Saglam, Adem ULg; Cox, Cédric ULg et al

Conference (2008)

Spatially resolved spectra of the NO delta and gamma ultraviolet bands have been obtained from 80 to 130 km on the Venus night side with the SPICAV instrument on board Venus Express. This NO airglow ... [more ▼]

Spatially resolved spectra of the NO delta and gamma ultraviolet bands have been obtained from 80 to 130 km on the Venus night side with the SPICAV instrument on board Venus Express. This NO airglow emission results from radiative recombination of oxygen and nitrogen atoms created on the dayside and transported by the subsolar to antisolar global circulation. Spectral images of the O2 (1 â delta g ) at 1.27 µm have also been made with the VIRTIS-M instrument both at nadir and at the limb. The O2 (1 â g ) emission is produced by three-body recombination of O atoms giving rise to an airglow layer near 96 km. The brightness of both emissions changes by over an order of magnitude. They also show variations in the altitude of the peak emission, with larger variability of the NO airglow. The characteristics of both airglows and their implications on global circulation and vertical transport on the nightside will be discussed. Concurrent observations of both limb airglows will be described. It will be shown that limb observations of the vertical and latitudinal distribution of the 1.27 µm emission make it possible to remotely determine the density of atomic oxygen in the upper mesosphere and improve current atmospheric models. One-dimensional models of the O and N distributions will be presented and global properties of the 1-D parameterization of turbulent transport will be discussed. [less ▲]

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See detailA systematic procedure to predict flows induced by major dysfunctions on complexes or cascades of dams
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 3rd IAHR-International Symposium on Hydraulic Structures (2008)

Hazard analysis of dams arranged in complex or in cascade may involve the assessment of a large number of different scenarios of combined failures. However, a tremendous computation time would be needed ... [more ▼]

Hazard analysis of dams arranged in complex or in cascade may involve the assessment of a large number of different scenarios of combined failures. However, a tremendous computation time would be needed to perform a detailed modeling of the flows generated by all possible scenarios. Therefore, the present paper describes a rational methodology for analyzing the flows induced by the most relevant incidents occurring on a complex or in a cascade of dams and reservoirs. The methodology combines several hydrodynamic models, including the twodimensional flow solver WOLF 2D and a simplified lumped hydrodynamic model, to simulate (i) the flows induced on the dams complex, (ii) the potential breaching in cascade of other dams, as well as (iii) the propagation of the flood wave in the whole downstream valley. The application of the methodology to a practical case study involving a complex of five dams is also described. [less ▲]

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See detailNumerical, analytical and experimental investigations on the response of steel and composite buildings further the loss of a column
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg; Luu, Nguyen Nam Hai ULg

in Proceedings of the Colloquium on structural design of constructions subjected to exceptional or accidental actions (2008)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. Accord-ing to Eurocodes and some ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. Accord-ing to Eurocodes and some different other national design codes, the structural integrity of civil engineering constructions should be ensured through appropriate measures but, in most of the cases, no precise practical guidelines on how to achieve this goal are provided. A European RFCS project entitled “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines ensuring the structural integrity of steel and composite structures under exceptional events through an appropriate robustness. In particular, one substructure test simulating the loss of a column in a composite building has been performed at Liège University. Present paper describes ana-lytical, numerical and experimental investigations carried out at Liège University as part of this European project. [less ▲]

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See detailAffective valence influences participant’s susceptibility to false memories and illusory recollection
Dehon, Hedwige ULg; Laroi; Van der Linden, Martial

Poster (2008)

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See detailAnalyse quantitative par spectroscopie proche infrarouge: Application au test d'unifomité de teneur des comprimés
Ginot, Y. M.; Bernard-Moulin, P.; Cinier, R. et al

Conference (2008)

La spectroscopie Proche infrarouge présente un large potentiel d'applications dans l'industrie pharmaceutique par sa capacité à transmettre des informations reliées à la fois à la structure chimique des ... [more ▼]

La spectroscopie Proche infrarouge présente un large potentiel d'applications dans l'industrie pharmaceutique par sa capacité à transmettre des informations reliées à la fois à la structure chimique des échantillons et à leur état physique. Elle peut être mise à profit pour des analyses qualitatives, telles l'identification des matières premières, et également pour des analyses quantitatives telles le dosage d'un principe actif dans un comprimé. Avec pour avantage une rapidité inégalée pour délivrer un résultat comparée aux techniques classiques en vigueur. Attrayante par ses performances, cette spectroscopie nécessite cependant une prise en main qui doit respecter une démarche minutieuse et souvent déroutante par son aspect heuristique (allers-retours) et à la mise en oeuvre d'outils d'analyse statistique multivariée. Si de nombreuses publications témoignent de la puissance de cet outil, il est apparu opportun de rassembler en un même texte la démarche de développement à suivre et les repères à connaître pour permettre son utilisation en analyse quantitative dans un contexte de libération pharmaceutique. Le travail de cette commission a été de rassembler les éléments issus de la pratique industrielle en se concentrant sur l'un des essais les plus intéressants: celui de l'uniformité de teneur des comprimés. Ce test est en effet l'une des applications où la rapidité de mise en oeuvre est le plus appréciable, tout en étant celui qui peut poser le plus de questions quant à la validité des résultats et la prise de décision pharmaceutique. [less ▲]

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See detailAn explicit projection method for solving incompressible Navier-Stokes equations
Detrembleur, Sylvain ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 2nd International Junior Researcher and Engineer Workshop on Hydraulic Structures (2008)

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See detailProsthesis-Patient Mismatch is an independent Predictor of Short-term Mortality Following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2008)

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See detailMaking sense of the Chaos: Model-based CVS monitoring and decision support in critical care
Shaw, G. M.; Chase, J. G.; Hann, C. E. et al

in Proceedings of the NZ Physiological Society 2008 Medical Science Congress (MedSci 2008) (2008)

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See detailModel-based detection of pulmonary embolism using an extended physiologically relevant, cardiovascular model
Kok, K.; Starfinger, C.; Hann, C. E. et al

in Proceedings of Engineering & Physical Sciences in Medicine and Australian Biomedical Engineering Conference (EPSM ABEC 2008) (2008)

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See detailQuasar Host Orientation and Polarization: Insights into the Type 1/Type 2 Dichotomy
Borguet, Benoît ULg; Hutsemekers, Damien ULg; Letawe, Géraldine ULg et al

in Revista Mexicana de Astronomía y Astrofísica (2008), 32

We investigate correlations between the optical linear polarization position angle and the orientation of the host galaxy/extended emission of Type 1 and Type 2 Radio-Loud (RL) and Radio-Quiet (RQ ... [more ▼]

We investigate correlations between the optical linear polarization position angle and the orientation of the host galaxy/extended emission of Type 1 and Type 2 Radio-Loud (RL) and Radio-Quiet (RQ) quasars. We have used high resolution Hubble Space Telescope (HST) data and deconvolution process to obtain a good determination of the host galaxy orientation. With these new measurements and a compilation of data from the literature, we find a significant correlation between the polarization position angle and the position angle of the major axis of the host galaxy/extended emission. The correlation appears different for Type 1 and Type 2 objects and depends on the redshift of the source. Interpretations in the framework of the unification model are discussed. [less ▲]

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See detailCauses of death of harbor porpoises (Phocoena phocoena) stranded on the Dutch coast
Jauniaux, Thierry ULg; Bergerie, H.; Camphuysen, K. et al

in proceeding of the annual conference (2008)

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See detailQuantum imaging with uncorrelated single photon sources
Bastin, Thierry ULg; Thiel, C.; Solano, E. et al

Conference (2008)

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See detailVapor phase doping: an atomic layer deposition approach to n-type doping in classical chemical vapor deposition epitaxy
Takeuchi, Shotaro; Nguyen, Ngoc Duy ULg; Leys, Frederik et al

Conference (2008)

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See detailQuantum imaging with trapped ions
von Zanthier, J.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2008)

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See detailDigital Cooperative Studio 07-08
Kubicki, Sylvain; Bignon, Jean-Claude; Elsen, Catherine ULg et al

in Pawar, Kulwant S.; Gonçalves, Ricardo; Thoben, Klaus-Dieter (Eds.) Proceedings of the 14th International Conference on Concurrent Enterprising : ICE 2208, A New Wave of Innovation in Collaborative Networks (2008)

Teaching cooperation-related issues to AEC (Architecture, Engineering and Construction) students is a major stake nowadays. There are many reasons for that: construction projects become more and more ... [more ▼]

Teaching cooperation-related issues to AEC (Architecture, Engineering and Construction) students is a major stake nowadays. There are many reasons for that: construction projects become more and more complex and cooperation practices are evolving in both organizational and IT-based ways. It is notably for these reasons that the issue of IT is addressed in most of the AEC-oriented schools and universities. Traditionally IT is taught to support the tasks of each specific construction field (e.g. CAD for architects, simulation tools for static engineers etc.). The Digital Cooperative Studio, presented in this article, considers IT as a support to cooperation and especially its communication and coordination dimensions. Moreover, we describe here a living lab involving students, teachers and researchers. This strong link between research and teaching allows both the students to be “analysts” of their real project situations and the researchers to experiment their development in real project situations. [less ▲]

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See detailEfficiency of Targeted Energy Transfers in Coupled Nonlinear Oscillators Associated with 1:1 Resonance Captures
Sapsis, T.; Vakakis, Alexander F.; Gendelman, O. V. et al

in 45th Technical Meeting of the Society of Engineering Science, Urbana Champaign, 2008 (2008)

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See detailComparing Simulations and Measurements of Prestressed MEMS
Hannot, Stephan; Rochus, Véronique ULg; Rixen, Daniel

in ECCOMAS (2008)

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See detailPerturbation Finite Element Method for Refining Magnetic Circuit Models
Dular, Patrick ULg; V Sabariego, Ruth ULg; Ferreira da Luz, Mauricio Valencia et al

in Proceedings of the XX Symposium Electromagnetic Phenomena in Nonlinear Circuits (EPNC2008) (2008)

Model refinements of magnetic circuits are performed via a subproblem finite element method based on a perturbation technique. An approximate problem considering ideal flux tubes is first solved. It gives ... [more ▼]

Model refinements of magnetic circuits are performed via a subproblem finite element method based on a perturbation technique. An approximate problem considering ideal flux tubes is first solved. It gives the sources for finite element perturbation problems considering all the details of the exterior regions, thus accounting for leakage fluxes. The procedure simplifies both meshing and solving processes. It quantifies the gain given by each model refinement on both local and global quantities. [less ▲]

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See detailACMEG-TS: A unified elasto-plastic constitutive model to simulate coupled processes in non-isothermal unsaturated soils.
François, Bertrand ULg; Laloui, Lyesse

in 1st European Conf. on Unsaturated Soils (2008)

Research interest in the thermo-mechanical behaviour of unsaturated soils is growing as a result of an increasing number of geomechanical problems involving both thermal and unsaturated effects. A new ... [more ▼]

Research interest in the thermo-mechanical behaviour of unsaturated soils is growing as a result of an increasing number of geomechanical problems involving both thermal and unsaturated effects. A new constitutive model dealing with partially saturated soils under non-isothermal conditions is presented through a unified and highly coupled constitutive approach. In the context of the elasto-thermoplasticity and the critical state theory, the so-called ACMEG-TS model uses the concepts of multi-mechanism and bounding surface theory. The generalized effective stress framework is adopted to represent the stress state in the soil. This model brings advancements on the thermo-hydraulic couplings that directly affect the mechanical behaviour of the materials. The constitutive relations based on the evolutions of the two key parameters (the reconsolidation pressure and the air-entry suction) make it possible to reproduce the main features of the thermo-mechanical behaviour of unsaturated soils. Theoretical aspects of the paper are supported by comparisons between numerical simulations and experimental results extracted from literature. [less ▲]

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See detailLa marche du sujet fibromyalgique et d’un sujet dépressif est-elle différenciable ? Exploration de deux affections « voisines » à partir d’un accéléromètre tri-axial.
Maquet, Didier ULg; Jaspar, J.; Lecart, Marie-Paule ULg et al

in Revue du Rhumatisme (2008), 75

Objectif : Analyser la marche de populations souffrant d’affections présentant certaines similitudes en termes de symptomatologie (fatigue, stress, anxiété, ralentissement psychomoteur, …) et pour ... [more ▼]

Objectif : Analyser la marche de populations souffrant d’affections présentant certaines similitudes en termes de symptomatologie (fatigue, stress, anxiété, ralentissement psychomoteur, …) et pour lesquelles le diagnostic différentiel apparaît parfois malaisé. Patients et méthodes : Cette étude inclut 32 sujets fibromyalgiques (46  10 ans), 20 sujets hospitalisés pour un état dépressif (49  14 ans) et 20 sujets volontaires contrôles (49  16 ans). L’analyse tri-dimensionnelle de la marche est réalisée à partir d'un système ambulatoire d'accélérométrie triaxial (Locometrix® Centaure Metrix, France) et d'une ligne de chronométrage. Le sujet marche à sa vitesse de confort, équipé de l'accéléromètre fixé à l'aide d'une ceinture élastique. L'épreuve, composée de 6 trajets rectilignes de 40 mètres, permet de suivre le profil des paramètres analysés tout au long de la distance totale parcourue (240 mètres). Les paramètres analysés sont : la vitesse de marche, la fréquence de pas, la longueur de pas, la symétrie et la régularité des pas, la puissance mécanique suivant les axes antéro-postérieur, crânio-caudal et médio-latéral, le coût énergétique. Résultats : La marche de la population fibromyalgique présente diverses altérations significatives non seulement en comparaison de la population contrôle mais aussi de la population dépressive. Nous observons chez le fibromyalgique une réduction significative (p < 0,05) de la vitesse de marche, de la longueur de pas, des activités suivant les axes antéro-postérieur et crânio-caudal. En outre, cette population présente une marche moins régulière (p < 0,05) alors que le coût énergétique de la marche est diminué (p < 0,05). Les paramètres de marche enregistrés au sein de la population dépressive apparaissent intermédiaires entre sujets contrôles et fibromyalgiques. Cependant, aucune modification significative ne s’observe entre populations contrôle et dépressive. Des travaux ultérieurs tenteront en outre de mettre en relation l’altération des paramètres de marche avec le degré d’anxiété et de dépression objectivé. Discussion : Bien que l’on évoque régulièrement un ralentissement fonctionnel chez les sujets souffrant de ces 2 affections « voisines », ce travail démontre que la marche d’un sujet dépressif et d’un sujet fibromyalgique semble différenciable. Ce dernier adopte une marche plus lente, moins régulière et visant à une « économie » d’énergie comme l’atteste le coût énergétique et les activités suivant les 3 axes. Conclusion : Cette épreuve pourrait constituer un outil original dans la caractérisation d’une population pathologique et le suivi longitudinal d’un patient. [less ▲]

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See detailUn modèle de comportement thermo-plastique pour les sols-non-saturés: Application aux stockages de déchets nucléaires.
François, Bertrand ULg

in 26eme Rencontres Universitaires de Génie Civil (2008)

Un modèle constitutif thermo-hydro-mécanique dédié aux sols fins a été développé afin de prédire le comportement des géomatériaux intervenant dans la problématique du confinement des déchets nucléaires en ... [more ▼]

Un modèle constitutif thermo-hydro-mécanique dédié aux sols fins a été développé afin de prédire le comportement des géomatériaux intervenant dans la problématique du confinement des déchets nucléaires en couche géologique profonde. Ce modèle considère l’aspect couplé des processus thermique, hydrique et mécanique. Les équations constitutives sont présentées. L’implémentation de cette loi de comportement dans deux logiciels d’éléments finis a permis une étude rigoureuse de plusieurs scénarios rencontrés dans les sols entourant les futurs déchets radioactifs. Les enseignements de chacune de ces études ainsi que l’apport du modèle utilisé sont présentés. [less ▲]

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See detailPregnancy diagnosis in ruminant species.
Melo de Sousa, Noelita ULg; Szenci, O.; Taverne, M. A. M. et al

in Reproduction in Domestic Animals (2008), 43(Suppl 5), 104

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See detailAphid honeydew is not only a sugary and amino-acid secretion
Leroy, Pascal ULg; Heuskin, Stéphanie ULg; Sabri, Ahmed ULg et al

Poster (2008)

Aphids, feeding from the phloem sap of plants, are the most common honeydew producing insects. This aphid excretory product consists in an aqueous mixture of different chemical compounds of which the most ... [more ▼]

Aphids, feeding from the phloem sap of plants, are the most common honeydew producing insects. This aphid excretory product consists in an aqueous mixture of different chemical compounds of which the most important are sugars (90-95% of the dry weight) and amino acids. This excretory product, used by parasitoids and predators, plays a crucial role in the tritrophic interactions : (1) honeydew is an important food complement and (2) honeydew acts as a volatile and a contact kairomone. These characteristics could be exploited for enhancing the biological control in fields through the use of an « artificial honeydew ». [less ▲]

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See detailMechanical quantification of porous structures by the combined use of micro-CT and in-situ loading
Kerckhofs, Greet ULg; Schrooten, Jan; Elicegui, Laida et al

in Proceedings book WCNDT 2008 (2008)

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See detailQuantum imaging using single photon sources
von Zanthier, J.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2008)

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See detailComputational modelling of peri-implant healing
Amor, Nadia; Geris, Liesbet ULg; Vander Sloten, Jos et al

in Middleton, J.; Jones, M. L.; Shrive, N. (Eds.) Proceedings of the 8th interantional symposium on Computer Methods in Biomechanics and Biomedical Engineering (2008)

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See detailDu crayon au stylo numérique : influences des interprétations numériques sur l'activité graphique en tâches de conception.
Safin, Stéphane ULg; Juchmes, Roland ULg; Leclercq, Pierre ULg

in IHM 2008: Proceedings of the 20th international conference on Francophone sur l'Interaction Homme-Machine (2008)

Notre recherche s'inscrit dans le cadre du développement de logiciels basés sur le dessin à main levée dans le domaine de l'architecture. Dans cet article, nous étudions l’activité de "mise au net" de ... [more ▼]

Notre recherche s'inscrit dans le cadre du développement de logiciels basés sur le dessin à main levée dans le domaine de l'architecture. Dans cet article, nous étudions l’activité de "mise au net" de dessins lors de la phase d'esquisse préliminaire et cherchons à identifier des modifications de cette activité in-duites par un environnement logiciel. Nous observons quatre activités de conception, deux sur papier-crayon et deux sur environnement numérique et déduisons des conclusions opérationnelles pour le dé-veloppement de logiciels destinés à supporter le croquis d'architecture. [less ▲]

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See detailEffects of short chain fructo-oligosaccharides on insulin sensitivity and gene expression of fat tissues in obese dogs
Respondek, F.; Swanson, K.; Herpigny, F. et al

in Proceedings of the Nutrition Society (2008), 67

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See detailCoupling of N Qubits to Any Dicke State via Projective Measurements
Thiel, C.; Maser, A.; Bastin, Thierry ULg et al

Conference (2008)

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See detailStudy of the QSO HE0354-5500 with combined HST imaging and VLT spectroscopy . An example of a deconvolution-based method for probing the QSOs host galaxies characteristics
Letawe, Yannick ULg; Magain, Pierre ULg; Letawe, Géraldine ULg et al

in Memorie della Società Astronomica Italiana : Journal of the Italian Astronomical Society (2008), 79

The host galaxy of the QSO HE0354-5500 (M_B=-24.7, z=0.2674) is studied on the basis of high resolution HST optical images and spatially resolved VLT slit spectra. The morphology and dynamics of the host ... [more ▼]

The host galaxy of the QSO HE0354-5500 (M_B=-24.7, z=0.2674) is studied on the basis of high resolution HST optical images and spatially resolved VLT slit spectra. The morphology and dynamics of the host are described. The gas ionization and velocity are mapped as a function of the distance to the central QSO. Reflection or scattering of the QSO Halpha line from remote regions of the galaxy is detected. The line shifts show that the matter responsible for the light reflection moves away from the QSO, likely accelerated by its radiation pressure. Moreover, different resolved emission regions are found in the central kpc, both in the images and the spectra. [less ▲]

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See detailOperational Modal Analysis using Second-Order Blind Identification
Poncelet, Fabien ULg; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in 26th International Modal Analysis Conference, Orlando, 2008 (2008)

For modal analysis of large structures, it is unpractical and expensive to use artificial excitation (e.g., shakers). However, engineering structures are most often subject to ambient loads (e.g., traffic ... [more ▼]

For modal analysis of large structures, it is unpractical and expensive to use artificial excitation (e.g., shakers). However, engineering structures are most often subject to ambient loads (e.g., traffic and wind) that can be exploited for modal parameter estimation. One difficulty is that the actual loading conditions cannot generally be measured, and output-only measurements are available. This paper proposes to explore the utility of blind source separation (BSS) techniques for operational modal analysis. The basic idea of BSS is to recover unobserved source signals from their observed mixtures. The feasibility and practicality of the proposed method are demonstrated using an experimental application. [less ▲]

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See detailThe SK channel blocker AG525E1 increases locomotor activity and in vivo dopamine release in the rat nucleus accumbens
Neny, M.; Lemmer, Y.; Graulich, A. et al

in Phillips, P. E. M.; Sandberg, S. G.; Ahn, S. (Eds.) et al Monitoring Molecules in Neuroscience - Proceedings of the 12th International Conference on In Vivo Methods (2008)

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See detailA far infrared/terahertz micromechanical sensor based on surface plasmons resonance
Hastanin, Juriy ULg; Renotte, Yvon ULg; Fleury-Frenette, Karl ULg et al

in Proceedings of SPIE (2008), 7113

This paper describes a new concept related to the bolometric micromechanical sensors for detecting far IR and THz radiation. We believe that this concept permits a low cost and ease of fabrication of ... [more ▼]

This paper describes a new concept related to the bolometric micromechanical sensors for detecting far IR and THz radiation. We believe that this concept permits a low cost and ease of fabrication of large bi-dimensional array of sensors with an enhanced signal-to-noise ratio. The micromechanical sensor comprises a thermo-sensitive bi-material (multimaterial) micro-cantilever beam with a selective absorber dedicated to far IR and THz radiation energy, and optical readout system based on surface plasmon resonance for detecting the bending of the micro-cantilever element. To increase the radiation detector sensitivity, the SPR phenomenon is used for cantilever deflection monitoring. [less ▲]

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See detailDes appétits nouveaux pour les produits de terroir ?
Duquesne, Brigitte ULg

Conference (2008)

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See detailDevonian mio-and megaspores in Western Gondwana
Steemans, Philippe ULg; Breuer, Pierre; Miller, M.

Conference (2008)

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See detailSerum dioxin and PCB levels among PCB waste processing plant workers
Eppe, Gauthier ULg; Dupas, D.; Chisacof, I. et al

in Organohalogen Compounds (2008), 70

A clinical investigation and a biological monitoring were carried out to evaluate the occupational exposure of workers in contact with pyralen in a PCB-transformer and capacitor decontamination plant in ... [more ▼]

A clinical investigation and a biological monitoring were carried out to evaluate the occupational exposure of workers in contact with pyralen in a PCB-transformer and capacitor decontamination plant in France. The aim of this study was to assess the body burden of polychlorinated dibenzo-p- dioxin (PCDDs), polychlorinated dibenzofurans (PCDFs), dioxin-like (DL) PCBs and marker PCBs for those workers. We examined 8 representative workers (34-44 years old). The subjects of this study worked from 5 years to 19 years at the plant. All workers reported daily multiple contacts with various metal and wood parts of dismantled transformers during working hours. On a yearly basis, the exposed subjects were examined by the occupational health physician for a check-up. Basic parameters such as liver function and lipid statement were performed. [less ▲]

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See detailDuplex stainless steel columns and beam-columns in case of fire
Lopes, N.; Vila Real, P. M. M.; Simoes da Silva, L. et al

in Kodur, Venkatesh; Tan, Kang Hai (Eds.) Proceedings of the Fifth International Conference Structures in Fire (2008)

It is the purpose of this paper to evaluate the accuracy and safety of the currently prescribed design rules in Eurocode 3: Part 1.2 for the evaluation of the resistance of duplex stainless steel columns ... [more ▼]

It is the purpose of this paper to evaluate the accuracy and safety of the currently prescribed design rules in Eurocode 3: Part 1.2 for the evaluation of the resistance of duplex stainless steel columns and beam-columns. This evaluation is carried out by performing numerical simulations on Class1 and Class 2 stainless steel H-columns. These numerical simulations are performed using the program SAFIR. Eurocode 3 states that stainless steel structural members, subjected to high temperatures, must be designed with the same formulae used for carbon steel members. However, as these two materials have different constitutive laws, it should be expected that, different formulae for the calculation of member stability should be used for fire design. It is considered buckling in the two main cross-section axis, and, in the case of the beam-columns, different bending moment diagrams. Parametric studies of the behaviour of the duplex EN 1.4462 stainless steel grade (austenitic-ferritic in Eurocode 3) columns and beam-columns subjected to fire are presented. [less ▲]

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