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See detailAn unexpected result for the V444 Cyg binary
Nazé, Yaël ULg; Lomax, J.; Hoffman, J.

in EAS Publications Series (2013, February 01)

V444 Cyg is a short-period (4 d) binary composed of two massive objects, a WN star and an O star. The winds of the two massive components collide, generating X-ray emission. A monitoring campaign in the ... [more ▼]

V444 Cyg is a short-period (4 d) binary composed of two massive objects, a WN star and an O star. The winds of the two massive components collide, generating X-ray emission. A monitoring campaign in the high-energy domain was performed using Swift and XMM-Newton, with surprising results on the collision geometry (wide shock opening angle, clear Coriolis deflection). Polarimetric data further help to understand the system properties. This new information places strong constraints on the physical parameters of the two stars. [less ▲]

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See detailLes clauses 'abusives' du contrat de travail
Kefer, Fabienne ULg; Mortier, Aurélie ULg

in Les clauses abusives dans les contrats usuels (2013, February 01)

Dans les relations de travail, l’équilibre du rapport contractuel s’établit par une conjugaison permanente des techniques du droit des obligations et de celles propres au droit du travail. L'article 1134 ... [more ▼]

Dans les relations de travail, l’équilibre du rapport contractuel s’établit par une conjugaison permanente des techniques du droit des obligations et de celles propres au droit du travail. L'article 1134 du Code civil ou la théorie de la cause sont autant de facteur de rééquilibrage du rapport contractuel que la liberté du travail ou les limitations du pouvoir potestatif de l'employeur. La sanction des clauses est également étudiées ainsi que les possiblités de renonciation à la protection légale. [less ▲]

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See detailLungenfibrose
Clercx, Cécile ULg

in Proceedings of the 34. Internationaler Fortbildungskurs Kleintierkrankheiten : “Thorax – Herz- und Lungenerkrankungen" - Flims -Switzerland (2013, February)

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See detailA Continuum Damage Mechanics Model for the Analysis of the Crashworthiness of Composite Structures: A work in progress
Chiu, Louis N S; Falzon, Brian G; Boman, Romain ULg

in Proceedings of the 15th Australian Aeronautical Conference (2013, February)

The crashworthiness capability of an aircraft structure is dependent on its ability to attenuate crash loading via the controlled deformation of energy absorbing devices. An energy-based constitutive ... [more ▼]

The crashworthiness capability of an aircraft structure is dependent on its ability to attenuate crash loading via the controlled deformation of energy absorbing devices. An energy-based constitutive relation was employed to model the behaviour of carbon fibre reinforced epoxy resin composite material under crush loading. Each of the damage modes in the fibre and matrix was treated separately with its own damage initiation and progression relationships as well as a damage parameter that tracks damage progression. Each damage parameter dictates the reduction in stiffness in the respective principal loading directions. This model was implemented for a 3D solid brick element in contrast to shell-based formulations currently available. Crushing composite structures were modelled and the results validated against experimental data. The force-displacement response / specific energy absorption and the failure modes obtained from the simulation show that the underlying physics of the crushing have been captured by the proposed model but that further work is required for reliable quantitative correlation. [less ▲]

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See detailGrowth, development and metabolic programming in premature infants
SENTERRE, Thibault ULg

in 8th International Neonatal Conference (2013, February)

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See detailRelating Local Permeability Changes to the Deformation of Preforms during the Manufacture of Complex-Shaped Composite Structures
Pierce, Robert S; Falzon, Brian G; Boman, Romain ULg

in Proceedings of the 15th Australian Aeronautical Conference (2013, February)

The transition to using carbon-fibre composites in the primary structure of passenger aircraft is now well established with focus shifting towards reducing manufacturing costs. This study reports on ... [more ▼]

The transition to using carbon-fibre composites in the primary structure of passenger aircraft is now well established with focus shifting towards reducing manufacturing costs. This study reports on initial results in the development of accurate numerical process modelling tools for resin-infused composite structures. A continuum-based, finite element material model has been developed to simulate the draping of a dry carbon fibre fabric, accurately tracking the changes in the warp and weft fibre orientations. A multiple ply draping example demonstrates the large variation of shear angles that are prevalent in forming processes. The relationship between shear angle and permeability was studied experimentally as it is integral to the accuracy of the resin infusion modelling process. The anisotropic permeability of the plain weave fabric was observed to increase by a factor of five as the shear locking angle was approached, with principal permeability values, K1 and K2, increasing and decreasing by a factor of approximately two, respectively. [less ▲]

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See detailAutomated platform for the quality control of PET-CT scanners following AFCN/FANC recommendations
Bernard, Claire ULg; Paulus, Cyril; JODOGNE, Sébastien ULg et al

in Proceedings of the Belgian Hospital Physicists Association Symposium (2013, February)

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See detailA nap to recap: Reward strengthens relational memory during daytime sleep
Igloi, Kinga; Gaggioni, Giulia ULg; Eryilmaz, Hamdi et al

in Abstract book of the NCCR Annual Research Forum (2013, February)

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See detailL'intérêt des races mixtes dans les systèmes laitiers : enseignements du projet BlueSel
Muchembled, A.; Beguin, E.; Glorieux, G. et al

in 18ième Carrefour des Productions animales : Nouvelles approches pour une optimisation de nos élevages laitiers (2013, February)

La « Bleue Mixte » (BM) est une race à petit effectif localisée de part et d’autre de la frontière franco-belge. Menacée de disparition, elle bénéficie d’un projet transfrontalier BlueSel soutenu par le ... [more ▼]

La « Bleue Mixte » (BM) est une race à petit effectif localisée de part et d’autre de la frontière franco-belge. Menacée de disparition, elle bénéficie d’un projet transfrontalier BlueSel soutenu par le programme européen INTERREG IV et les autorités françaises et wallonnes. L’objectif de ce projet est d’assurer la conservation, la sélection et la promotion de la BM. L’un des volets du programme a consisté à étudier la rentabilité économique des troupeaux BM. Il s’est appuyé sur un réseau de 16 fermes de références mis en place fin 2008 jusque mi 2012. La collecte des données techniques et économiques sur les 4 années comptables de 2007 à 2010 a reposé sur la méthodologie mise en oeuvre au sein du dispositif français des Réseaux d’élevage. Les exploitations BM ont été regroupées selon deux systèmes, herbivore et polyculture-élevage, et comparées aux exploitations laitières Prim’Holstein (PH) du Réseau d’élevage de Nord-Picardie. Les résultats démontrent la capacité des éleveurs de vaches BM à obtenir de bonnes performances économiques malgré de plus faibles productivité laitière (4225 l/VL) et taux (3,70 % de MG et 3,22 % de protéines), et un moindre prix du lait, grâce notamment à une conduite de troupeaux bien maîtrisée, des surfaces fourragères très bien valorisées, et la mixité lait-viande très affirmée de la race qui atténue les fluctuations du prix du lait. En système herbivore, les exploitations BM s’avèrent économes et autonomes avec une excellente valorisation des prairies. En système de polyculture-élevage, les troupeaux sont conduits de façon à peine plus intensive qu’en système herbivore, contrairement aux troupeaux PH. [less ▲]

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See detailPhysical and numerical modelling in low-head structures design
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Rulot, François ULg et al

in Bung, Daniel; Pagliara, Stefano (Eds.) Proceedings of the International Workshop on Hydraulic Design of Low-Head Structures (2013, February)

Physical and numerical modelling may be combined within so-called composite or hybrid modelling. This enables to optimally take benefit of the respective strengths of each modelling approach, while ... [more ▼]

Physical and numerical modelling may be combined within so-called composite or hybrid modelling. This enables to optimally take benefit of the respective strengths of each modelling approach, while compensating for their specific drawbacks. Different types of composite modelling may be identified, such as embedding a detailed physical model within a broader scale numerical model, interconnecting different physical and numerical models focusing each on specific processes, or validating a numerical model from experimental data before exploiting the numerical model to generate more results than availa-ble from the experimental facility. Besides, specifically in more basic research, composite modelling may also be used to improve in-depth understanding of the relative importance of different processes which act simultaneously in the experimental test and may be artificially separated in numerical simulations. [less ▲]

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See detailContexte géologique des sites mésolithiques de la Heid de Fer et de L’Ourlaine à Becco (Theux, Belgique)
Marion, Jean-Marc ULg; Simons, Justine; Mottequin, Bernard ULg

in Autour de l'hématite - Circulation et transformation au cours de la préhistoire récente. Méthodes d'analyse (2013, February)

The use of natural resources is a major source of information to study the socio-economic organization of the population from Prehistory to Antiquity, due to the fact that their exchange networks and ... [more ▼]

The use of natural resources is a major source of information to study the socio-economic organization of the population from Prehistory to Antiquity, due to the fact that their exchange networks and behaviors changed together with their lifestyles and know-how. If flint or other materials such as shale have been extensively studied, haematite, and particularly the oolitic haematite, remains hardly investigated as a material in terms of its origin and technical methods of utilization. The mesolithic sites of "L'Ourlaine" and the "Heid de Fer" (Becco, Theux, southern Belgium) are very close to an important Famennian (Upper Devonian) oolitic haematite outcrop. [less ▲]

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See detailFrequency-domain subspace identification of nonlinear mechanical systems - Application to a solar array structure
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg; Foltête, Emmanuel et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXI (2013, February)

The present paper addresses the experimental identification of a simplified realisation of a solar array structure in folded configuration. To this end, a nonlinear subspace identification technique ... [more ▼]

The present paper addresses the experimental identification of a simplified realisation of a solar array structure in folded configuration. To this end, a nonlinear subspace identification technique formulated in the frequency domain, referred to as the FNSI method, is exploited. The frequency response functions of the underlying linear structure and the nonlinear coefficients are estimated by this approach. Nonlinearity is caused by impacts between adjacent panels and friction and gaps appearing in their clamping interfaces. This application is challenging for several reasons, which include high modal density and the complicated nature of the involved nonlinear mechanisms. [less ▲]

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See detailEtude de la variabilité des aptitudes à la transformation laitière en Région wallonne basée sur l'utilisation de la spectrométrie infrarouge
Colinet, Frédéric ULg; Troch, Thibault ULg; Vanden Bossche, S. et al

in 18ième Carrefour des Productions animales : Nouvelles approches pour une optimisation de nos élevages laitiers (2013, February)

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See detailLa transition des territoires périurbains vers un modèle plus durable : perspectives pour le renouvellement périurbain.
Marique, Anne-Françoise ULg; Reiter, Sigrid ULg

in Van Ypersele, Jean-Pascal; Hudon, Marek (Eds.) 1er Congrès interdisciplinaire du Développement Durable : Quelle transition pour nos sociétés ? Thème 3 : Logement et Aménagement du territoire. Recueil. (2013, February)

L’article aborde la question du recyclage des quartiers périurbains existants sous l'angle énergétique. Deux leviers d’actions sont mobilisés à cet effet : la forme urbaine, qui est étudiée en ... [more ▼]

L’article aborde la question du recyclage des quartiers périurbains existants sous l'angle énergétique. Deux leviers d’actions sont mobilisés à cet effet : la forme urbaine, qui est étudiée en complémentarité de l’échelle du bâtiment individuel, et la mobilité, car l’étalement urbain est entretenu et favorisé, en grande partie par la dépendance à la voiture individuelle. Deux indicateurs principaux (les besoins de chauffage de différents types de formes périurbaines et un indice de performance des déplacements) sont développés et discutés pour mettre en évidence les scénarios de renouvellement les plus adaptés et répondre à deux questions : « comment intervenir dans les quartiers périurbains existants ? » et « où intervenir ? ». Des pistes concrètes visant à l’opérationnalisation d’un « renouvellement périurbain » plus durable sont ensuite proposées. [less ▲]

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See detailSur la voie de l’élevage laitier de précision en Wallonie - 2. ValLait, OptiVal et OptiVal+ : valoriser des données du contrôle des performances
Bastin, Catherine ULg; Gillon, A.; Massart, X. et al

in 18ème Carrefour des Productions agricoles: Nouvelles approches pour une optimisation de nos élevages laitiers (2013, February)

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See detailNutritional requirements for premature infants
SENTERRE, Thibault ULg

in 8th International Neonatal Conference (2013, February)

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See detailCan changes in nutritional practice alter necrotizing enterocolitis ?
SENTERRE, Thibault ULg

in 8th International Neonatal Conference (2013, February)

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See detailBronchiektasie
Clercx, Cécile ULg

in Proceedings of the 34. Internationaler Fortbildungskurs Kleintierkrankheiten : “Thorax – Herz- und Lungenerkrankungen" - Flims -Switzerland (2013, February)

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See detailChronische. Bronchitis Hund
Clercx, Cécile ULg

in Proceedings of the 34. Internationaler Fortbildungskurs Kleintierkrankheiten : “Thorax – Herz- und Lungenerkrankungen" - Flims -Switzerland (2013, February)

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See detailBakterielle und virale Pneumonien
Clercx, Cécile ULg

in Proceedings of the 34. Internationaler Fortbildungskurs Kleintierkrankheiten : “Thorax – Herz- und Lungenerkrankungen" - Flims -Switzerland (2013, February)

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See detailRobustness of steel building structures following a column loss
Huvelle, Clara ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in IABSE Workshop Helsinki 2013 "Safety, Failures and Robustness of Large Structures" Report (2013, February)

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See detailEosinophile Bronchopneumonie
Clercx, Cécile ULg

in Proceedings of the 34. Internationaler Fortbildungskurs Kleintierkrankheiten : “Thorax – Herz- und Lungenerkrankungen" - Flims -Switzerland (2013, February)

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See detail7. Lutte intégrée contre les ravageurs
Chavalle, Sandrine; Censier, Florence ULg; De Proft, Michel

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2013, February)

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See detailOrthanc - Lightweight, scriptable DICOM server for image management in radiotherapy departments
JODOGNE, Sébastien ULg; Sobczak, Sonia; DEVILLERS, Magali ULg et al

in Proceedings of the Belgian Hospital Physicists Association Symposium (2013, February)

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See detailNouveaux modes d’action publique en faveur de la transition des quartiers urbains vers un développement durable.
Ruelle, Christine ULg; Stangherlin, Gregor; Teller, Jacques ULg

in Van Ypersele, Jean-Pascal; Hudon, Marek (Eds.) 1er Congrès Interdisciplinaire du Développement Durable - Thème 5: Rôle des pouvoirs publics dans la transition. (2013, January 31)

L’article aborde la question de l’action publique visant à promouvoir le développement durable des quartiers urbains existants. En particulier, il envisage la pertinence de développer cette action à ... [more ▼]

L’article aborde la question de l’action publique visant à promouvoir le développement durable des quartiers urbains existants. En particulier, il envisage la pertinence de développer cette action à partir d’une réorientation de la « politique des quartiers », modalité de l’action publique héritée de la fin du XXème siècle. Les structures publiques de quartier mises en place dans le cadre de cette politique pourraient en effet jouer un rôle d’accélérateurs de la transition de ces quartiers. Elles ont le potentiel pour cela, notamment grâce au réseau social qu’elles développent au sein de la population locale, sans l’engagement de laquelle les pouvoirs publics peuvent bien peu de choses. L’article envisage ensuite la pertinence d’une généralisation de cette politique à tous les quartiers urbains, selon des intensités variables et en complémentarité avec les politiques urbaines plus stratégiques, afin d’assurer un développement équilibré de nos territoires. [less ▲]

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See detailA multiaxial constitutive model for concrete in the fire situation
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

in Proceedings of the 13th Fire and Materials Conference (2013, January 28)

Performance-based design in fire engineering leads to increasing demand for advanced temperature-dependent material models for the load bearing materials used in building structures. These models must be ... [more ▼]

Performance-based design in fire engineering leads to increasing demand for advanced temperature-dependent material models for the load bearing materials used in building structures. These models must be valid in natural fire situations including cooling down phase and must be sufficiently robust for complex numerical calculations such as, for example, the analysis of tensile membrane action in composite slabs. Although structural concrete is widely used in civil engineering, proper modelling of its thermo-mechanical behaviour remains a challenging issue for engineers mainly because of the complexity of the phenomena that result from the microcracking process in this material and because of the necessity to ensure the numerical robustness of the models. This paper presents a new multiaxial concrete model based on a plastic-damage formulation and developed to meet the specific requirements of structural fire engineers and researchers. The model, which incorporates an explicit term for transient creep strain and encompasses a limited number of material parameters, has been implemented in a finite element software dedicated to the nonlinear analysis of structures in fire. The paper presents a series of numerical simulations conducted to highlight the model ability to capture the main phenomena that develop in concrete under fire (permanent strains, degradation of the elastic properties, unilateral effect) as well as its ability to be used for the fire analysis of large-scale structural elements. As an example, the new concrete model is used in the numerical analysis of a full scale fire test on a composite steel-concrete slab and it is shown that the computed and measured results agree. [less ▲]

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See detailCoRoT Observations of O Stars: Diverse Origins of Variability
Blomme, R.; Briquet, Maryline ULg; Degroote, P. et al

in Astronomical Society of the Pacific Conference Series (2013, January 01)

Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsations in some of these ... [more ▼]

Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsations in some of these stars (HD 46202 and the binaries HD 46149 and Plaskett's star). These cover both opacity-driven modes and solar-like stochastic oscillations, both of importance to the asteroseismological modeling of O stars. Additional effects can be seen in the CoRoT light curves, such as binarity and rotational modulation. Some of the hottest O-type stars (HD 46223, HD 46150 and HD 46966) are dominated by the presence of red-noise: we speculate that this is related to a sub-surface convection zone. [less ▲]

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See detail2009: A Colliding-Wind Odyssey
Fahed, R.; Moffat, A. F. J.; Zorec, J. et al

in Astronomical Society of the Pacific Conference Series (2013, January 01)

We present the results from two optical spectroscopic campaigns on colliding-wind binaries (CWB) which both occurred in 2009. The first one was on WR 140 (WC7pd + O5.5fc), the archetype of CWB, which ... [more ▼]

We present the results from two optical spectroscopic campaigns on colliding-wind binaries (CWB) which both occurred in 2009. The first one was on WR 140 (WC7pd + O5.5fc), the archetype of CWB, which experienced periastron passage of its highly elliptical 8-year orbit in January. The WR 140 campaign consisted of a unique and constructive collaboration between amateur and professional astronomers and took place at half a dozen locations, including Teide Observatory, Observatoire de Haute Provence, Dominion Astrophysical Observatory, Observatoire du Mont-Mégantic and at several small private observatories. The second campaign was on a selection of 5 short-period WR + O binaries not yet studied for colliding-wind effects: WR 12 (WN8h), WR 21 (WN5o + O7 V), WR 30 (WC6 + O7.5 V), WR 31 (WN4o + O8), and WR 47 (WN6o + O5). The campaign took place at Leoncito Observatory, Argentina, during 1 month. We provide updated values of most of these systems for the orbital parameters, new estimates for the WR and O star masses and new constraints on the mass-loss rates and colliding wind geometry. [less ▲]

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See detailGAUFRE: a tool for an automated determination of atmospheric parameters from spectroscopy
Valentini, Marica ULg; Morel, Thierry ULg; Miglio, Andrea et al

in 40th Liege International Astrophysical Colloquium 'Ageing low-mass stars: from red giants to white dwarfs' (2013, January 01)

We present an automated tool for measuring atmospheric parameters (T_eff, log(g), [Fe/H]) for F-G-K dwarf and giant stars. The tool, called GAUFRE, is written in C++ and composed of several routines ... [more ▼]

We present an automated tool for measuring atmospheric parameters (T_eff, log(g), [Fe/H]) for F-G-K dwarf and giant stars. The tool, called GAUFRE, is written in C++ and composed of several routines: GAUFRE-RV measures radial velocity from spectra via cross-correlation against a synthetic template, GAUFRE-EW measures atmospheric parameters through the classic line-by-line technique and GAUFRE-CHI2 performs a chi^2 fitting to a library of synthetic spectra. A set of F-G-K stars extensively studied in the literature were used as a benchmark for the program: their high signal-to-noise and high resolution spectra were analysed by using GAUFRE and results were compared with those present in literature. The tool is also implemented in order to perform the spectral analysis after fixing the surface gravity (log(g)) to the accurate value provided by asteroseismology. A set of CoRoT stars, belonging to LRc01 and LRa01 fields was used for first testing the performances and the behaviour of the program when using the seismic log(g). [less ▲]

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See detailX-Ray Plasma Temperature Distribution in the Wind of ζ Puppis
Hervé, Anthony ULg; Rauw, Grégor ULg; Nazé, Yaël ULg

in Astronomical Society of the Pacific Conference Series (2013, January 01)

Different scenarios try to explain the X-ray production in the O-type star wind (magnetic confinement, embedded shocks…) and their plasma temperature distribution. In this context, we have developed a new ... [more ▼]

Different scenarios try to explain the X-ray production in the O-type star wind (magnetic confinement, embedded shocks…) and their plasma temperature distribution. In this context, we have developed a new modeling code which computes synthetic spectra as a function of plasma temperature, abundances, and localization of the X-ray emitting shell in the wind. Then we combine several synthetic spectra in order to fit the observed high-resolution spectra. Our preliminary results on ζ Puppis reveal a non-porous wind as well as non-solar abundances for the CNO elements. More important, an extended region with a low temperature plasma begins to emit close to the star surface while small shells with hotter temperature plasmas emit farther in the wind. [less ▲]

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See detailQuantitative NIR Spectroscopy of Massive Stars
Sana, H.; Stap, F. A.; de Koter, A. et al

in Astronomical Society of the Pacific Conference Series (2013, January 01)

Interest for near-infrared (NIR) spectroscopy of massive stars has been dramatically increasing over the last decade. Because it allows one to observe objects inaccessible at optical wavelengths due to ... [more ▼]

Interest for near-infrared (NIR) spectroscopy of massive stars has been dramatically increasing over the last decade. Because it allows one to observe objects inaccessible at optical wavelengths due to absorption, the infrared domain offers a privileged window to study highly extinguished objects. Yet, a detailed calibration of the massive star properties at NIR wavelength is still missing. Following the lines of the work of Repolust et al. (2005), we have acquired high resolution spectroscopy of several nearby massive stars using VLT/CRIRES, focusing on spectral lines of interest in the J, H, K, and L bands. In this work, we present the earliest results of our quantitative spectroscopic analysis of the main sequence stars in our sample. Using the unique combination of a genetic algorithm approach with the state-of-the-art non-LTE atmosphere model FASTWIND, we compare the stellar and wind properties as derived from the optical and the NIR regime. [less ▲]

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See detailNew INTEGRAL Observations of η Carinae Close to Periastron
Leyder, J.-C.; Walter, R.; Rauw, Grégor ULg

in Astronomical Society of the Pacific Conference Series (2013, January 01)

The soft X-ray thermal emission of η Carinae varies strongly around the periastron, following the orbital period of 5.5 yr. We studied the hard X-ray non-thermal emission of η Car using new INTEGRAL ... [more ▼]

The soft X-ray thermal emission of η Carinae varies strongly around the periastron, following the orbital period of 5.5 yr. We studied the hard X-ray non-thermal emission of η Car using new INTEGRAL observations taken close to periastron. We showed that the hard X-ray emission is very likely to be associated with η Car, and not with any other source found within the INTEGRAL error circle. We also showed that the 3-σ detection during the soft X-ray minimum is consistent with a hydrogen column density that does not exceed 6×10[SUP]23[/SUP] cm[SUP]-2[/SUP]. [less ▲]

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See detailAre Magnetic OB Stars More Prone to Mixing? Still an Unsettled Issue
Morel, Thierry ULg

in Astronomical Society of the Pacific Conference Series (2013, January 01)

We review our knowledge of the mixing properties of magnetic OB stars and discuss whether the observational data presently available support, as predicted by some theoretical models, the idea that ... [more ▼]

We review our knowledge of the mixing properties of magnetic OB stars and discuss whether the observational data presently available support, as predicted by some theoretical models, the idea that magnetic phenomena favour the transport of chemical elements. A (likely statistical) relationship between enhanced mixing and the existence of a field has been emerging over the last few years. As discussed in this contribution, however, a clear answer to this question is presently hampered by the lack of large and well-defined samples of magnetic and non-magnetic stars. [less ▲]

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See detailMassive Non-Thermal Radio Emitters: New Data and their Modeling
Volpi, D.; Blomme, R.; De Becker, Michaël ULg et al

in Astronomical Society of the Pacific Conference Series (2013, January 01)

During recent years some non-thermal radio emitting OB stars have been discovered to be binary or multiple systems. The non-thermal emission is due to synchrotron radiation that is emitted by electrons ... [more ▼]

During recent years some non-thermal radio emitting OB stars have been discovered to be binary or multiple systems. The non-thermal emission is due to synchrotron radiation that is emitted by electrons accelerated up to high energies. The electron acceleration occurs at the strong shocks created by the collision of radiatively-driven winds. Here we summarize the available radio data and more recent observations for the binary Cyg OB2 No. 9. We also show a new emission model which is being developed to compare the theoretical total radio flux and the spectral index with the observed radio light curves. This comparison will be useful in order to solve fundamental questions, such as the determination of the stellar mass-loss rates, which are perturbed by clumping. [less ▲]

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See detailQu’est-ce qu’une preuve de développement de compétence ? Témoignages autour de la récolte et de l’analyse critique de preuves de développement de compétences dans deux programmes faisant usages du portfolio pour l’évaluation finale de leurs étudiants
Poumay, Marianne ULg; Georges, François ULg

in Actes du 25ème colloque de l’ADMEE-Europe Fribourg - Evaluation et autoévaluation, quels espaces de formation (2013, January)

Il n’est pas « naturel » pour l’apprenant d’entrer dans une logique par laquelle il lui revient de démontrer ses progrès. Dans le présent article, nous tentons de mieux cerner la notion de preuves au ... [more ▼]

Il n’est pas « naturel » pour l’apprenant d’entrer dans une logique par laquelle il lui revient de démontrer ses progrès. Dans le présent article, nous tentons de mieux cerner la notion de preuves au travers de portfolios réalisés par des enseignants et formateurs inscrits dans deux programmes de l’université de Liège (Belgique). [less ▲]

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See detailA nap to recap: Reward strengthens relational memory during daytime sleep
Igloi, Kinga; Gaggioni, Giulia ULg; Eryilmaz, Hamdi et al

in Abstract book of the ABIM meeting (2013, January)

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See detailLinearized Power Flow Equations Based Predictive Control of Transmission Voltages
Hajian, Mahdi; Rosehart, William; Glavic, Mevludin et al

in Proceedings of the 46th Hawaii International Conference on System Sciences (HICSS-46) (2013, January)

In this paper, an approach based on the concept of Model Predictive Control (MPC) is used to control transmission voltages and prevent long-term voltage instability. The MPC model is based on a linearized ... [more ▼]

In this paper, an approach based on the concept of Model Predictive Control (MPC) is used to control transmission voltages and prevent long-term voltage instability. The MPC model is based on a linearized steady-state system model derived from power flow equations. Simulation results are presented for the case of Nordic32 test system. [less ▲]

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See detailWindelband on Beurteilung
Dewalque, Arnaud ULg

in Van der Schaar, Maria (Ed.) Judgement and the Epistemic Foundation of Logic (2013, January)

A main challenge for philosophers of the late nineteenth and early twentieth century was to construct judgements as acts of decision or position (thesis) rather than as acts of combination or synthesis ... [more ▼]

A main challenge for philosophers of the late nineteenth and early twentieth century was to construct judgements as acts of decision or position (thesis) rather than as acts of combination or synthesis. Let us call this the thetic view. Franz Brentano (1838–1917) is usually regarded as the best supporter of this view, since he takes advantage of the Kantian-Herbartian notion of ‘position’ (Setzung) to break with the traditional definition of judgement as symplokè (Martin 2006, 64 sq.; see Brentano 2008, 335). Generally speaking I think this usual line of interpretation is quite cor- rect, yet it could benefit from a more detailed account of the Brentano reception. What I would like to suggest is this: At stake in Brentano’s legacy is not just the rejection of the synthetic view but also the way in which the thetic dimension is itself conceived. There are, in fact, various ways of constructing judgements as thetic or positional phenomena. Brentano’s notion of ‘existential assertion’ is not the only way to do so. [less ▲]

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See detailFrom Fritz Teufel to Leo Bassi : Happening and provocation. Just a History of Overbidding and Inflation?
Hamers, Jérémy ULg

in Utopia and Critical Thinking in the Creative Process (2013, January)

Ludico-symbolic coups and assassination attempts, make-believe funerals and degeneration of trials into grotesque rhetorical jousting : everywhere throughout Europe and the United States in the mid ... [more ▼]

Ludico-symbolic coups and assassination attempts, make-believe funerals and degeneration of trials into grotesque rhetorical jousting : everywhere throughout Europe and the United States in the mid sixties, political happenings thrived. The acts/performances, which were for the most part carried out by groups or individuals close to the Marxist and pacifist student protest movement, can’t be dissociated from a situationnist understanding of the urban milieu, transformed into one large stage for militant theatre. Founded on the principal of diversion and provocation, these actions quickly led to inflation and overbidding. Caught in a hectic whirl which forced them to always push the limit further in order to evade, if only temporarily, a process of institutionalisation that threatens any act of provocation, they soon begin to loose their political effectiveness. Born from a common political and artistic origin as the leaders of the student left movement, several “terrorist” groups harden their tone at the beginning of the seventies and perpetrate acts of violence with a revolutionary intention. Breaking away from the theatrical and ludic student activity while also retaining their situationnist obedience and a certain theatrical conception of the urban place, these armed groups think up actions in the beginning of the seventies which induce a rupture in the performative and theatrical tradition of the end of the sixties. These acts have been the subject of in depths studies by authors who, however conscious of the theatrical origins of the actions of the extreme left terrorists, refer to a terminology which imposes a distinction between action (or happening/performance) and “terrorist” acts. On the basis of this terminological distinction, we will demonstrate not only that these actions of the beginning of the seventies must be considered in a direct lineage with the political-theatrical creation of the end of the sixties, but that they also offer a first escape route, politically efficient, to the inflation which threatens any act of provocation. If the actions of the RAF, the Red Brigades or the Weathermen evade institutionalisation which threatens any act of provocation, they nevertheless remain politically unsustainable and condemn those who imagine them as well as those who execute them to an inevitably tragic ending, incompatible with the pursuit of creative practice. This paradigm will guide us in identifying some more recent creative processes (fake conferences of the Yes Men, shows/performances of Leo Bassi) which try to overcome in turn the political precariousness of their predecessors in endowing themselves with an (auto)reflexive dimension. Beyond their heterogeneity, these actions/shows shall thus be perceived as objects which surpass the act of provocation, inevitably destined to wear out. Because, in actively implicating the spectator to a point where he becomes a full fledge component of an engaged and reflexive creative process, these practices reinstate the politico-theatrical performance in its indispensable efficiency. [less ▲]

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See detailComparison of shear and pull-off tests for testing adhesion of different content limestone fillers mortars used as repair system
Chendes, Remus; Dan, Sorin; Courard, Luc ULg

in STOIAN, Valeriu; DAN, Daniel; BOB, Corneliu (Eds.) et al Construction sustainability: efficient solution for design, execution and rehabilitation of the building (2013)

When a repair operation is performed and a new concrete or mortar is applied on the old concrete substrate, it is very important to have a good bond between the old concrete layer and the repair concrete ... [more ▼]

When a repair operation is performed and a new concrete or mortar is applied on the old concrete substrate, it is very important to have a good bond between the old concrete layer and the repair concrete system. The bond strengths usually determinate using pure tensile tests (pull-off tests) because of the field applicability of this category of tests. However, in most of the applications, shear stress is the main reason of the bond failure. In general, bond strength under tensile is considered smaller than bond strength in shear stress conditions. The objective of this paper is to compare the results obtained from tensile and shear tests and to potentially determine a mathematical relation between shear and tension. The materials used for tests are Ordinary Portland Cement and modified limestone fillers mortars. Specific humidity storage conditions have been selected. [less ▲]

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See detailAre Designers Sufficiently Instructed to Make the Most Rewarding Use of the Latest Steel Codes?
Maquoi, René ULg

in 2013 SSRC Stability Conference (2013)

Series of comments stressing some points of Eurocode 3 which must be duly mastered to enable more economical design of steel structures.

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See detailPlanification Optimiste dans les Processus Décisionnels de Markov avec Croyance
Fonteneau, Raphaël ULg; Busoniu, Lucian; Munos, Rémi

in 8èmes Journées Francophones de Planification, Décision et Apprentissage pour la conduite de systèmes (JFPDA'13) (2013)

Cet article décrit l'algorithme BOP (de l'anglais ``Bayesian Optimistic Planning''), un nouvel algorithme d'apprentissage par renforcement Bayésien indirect (c'est à dire fondé sur un modèle). BOP étend l ... [more ▼]

Cet article décrit l'algorithme BOP (de l'anglais ``Bayesian Optimistic Planning''), un nouvel algorithme d'apprentissage par renforcement Bayésien indirect (c'est à dire fondé sur un modèle). BOP étend l'approche de l'algorithme OP-MDP (de l'anglais ``Optimistic Planning for Markov Decision Processes'', voir [Busoniu2011,Busoniu2012]) au cas où les probabilités de transitions du MDP sous-jacent sont initialement inconnues, et doivent être apprises au travers d'interactions avec l'environnement. Les connaissances sur le MDP sous-jacent sont représentées par une distribution de probabilités sur l'ensemble de tous les modèles de transitions à l'aide de distributions de Dirichlet. L'algorithme BOP planifie dans l'espace augmenté état-croyance obtenu par concaténation du vecteur d'état avec la distribution postérieure sur les modèles de transitions. On montre que BOP atteint l'optimalité Bayésienne lorsque le paramètre de budget tend vers l'infini. Quelques expériences préliminaires montrent des résultats encourageants. [less ▲]

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See detailNew capabilities of the INCL4.6 model implemented into high-energy transport codes
Leray, S.; Boudard, A.; Braunn, B. et al

in Proceedings of Shielding Aspects of Accelerators, Targets and Irradiation Facilities 2011 (2013)

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See detail"Penser la technique" : clé pour un développement durable
du Jardin, Patrick ULg

in Ypersele, Jean-Pascal; Hudon, Marek (Eds.) 1er colloque interdisicplinaire du développement durable : Namur 31 janvier au 1er février 2013 (2013)

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See detailDu Grand Monarque au Mouton Blanc. Souvenirs d'écrivains
Droixhe, Daniel ULg

in Droixhe, Daniel (Ed.) Spa, carrefour de l'Europe des Lumières. Les hôtes de la cité thermale au XVIIIe siècle, sous la dir. de Daniel Droixhe, avec la collaboration de Muriel Collart (2013)

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See detailEffects of aging on task- and stimulus-related attention during a working memory task
Kurth, Sophie ULg; Hagelstein, Catherine ULg; Collette, Fabienne ULg et al

in Proceedings of the Annual Meeting of the Belgian Association for Psychological Sciences (2013)

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See detail(Bio)synthesis, extraction and purification of garlic derivatives showing therapeutic properties
DETHIER, Bérénice ULg; Nott, Katherine ULg; Fauconnier, Marie-Laure ULg

in Smagghe, Guy; Boeckx, Pascal; Bossier, Peter (Eds.) et al Communications in Agricultural and Applied Biosciences 2013 (2013)

Garlic has been used worldwide for centuries for its taste but also for its health benefits. Garlic's therapeutic compounds are mostly organosulfur compounds, recognized for their antioxidant, anticancer ... [more ▼]

Garlic has been used worldwide for centuries for its taste but also for its health benefits. Garlic's therapeutic compounds are mostly organosulfur compounds, recognized for their antioxidant, anticancer, anti-inflammatory and antimicrobial activity and their effect on cardiovascular diseases (reviewed by Block, 2010). When the cloves are crushed, allicin is synthesized as the vacuolar enzyme alliinase meets its substrate, the cytoplasmic alliin. Allicin is unstable and undergoes rearrangements to form three main groups of derivatives: allyl sulfides, ajoenes and vinyldithiins. The garlic processing method has a major influence on the products released both in terms of chemical composition and yields. For example, the type of medium (aqueous or oily) and the temperature can favour the formation of specific compounds. Our work aims at studying the influence of - the garlic origin, - the reaction conditions and - the extraction procedures (solvent, microwaves) on the organosulfur compounds formed. Particular attention is given to the stereochemistry and the stability of the compounds. Better understanding of the formation of high value natural molecules is important in order to lead further studies on the biological activity of the compounds or to use them as nutraceuticals. [less ▲]

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See detailMaternal transisition of dietary omega-3 fatty acids: effects on zootechnical performance and health status of the broiler progeny
Koppenol, A.; Franssens, L.; Everaert, Nadia ULg et al

in Proceedings of the 17th European Society of Veterinary and Comparative Nutrition Congress (2013)

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See detailEcologia funcional e filtros ambientais no campo rupestre
Negreiros, Daniel; Le Stradic, Soizig ULg; Fernandes, Geraldo Wilson et al

in Anais do 64º Congresso Nacional de Botânica: botânica sempre viva e XXXIII ERBOT Encontro Regional de Botânicos MG, BA e ES. (2013)

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See detailLe bol de Wellin et son "parent" de Valsgärde?
Van Wersch, Line ULg; Mathis, François ULg

in Lorren, Claude (Ed.) La Gaule, le monde insulaire et l'Europe du Nord au haut Moyen Age (2013)

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See detailModelling agricultural strategies to protect groundwater resources in the Hesbaye aquifer (Belgium)
Sohier, Catherine ULg; Degré, Aurore ULg

in Fraters, Dico; Kovar, Karel (Eds.) International Interdisciplinary Conference on Land Use and Water Quality, Reducing Effects of Agriculture, The Hague, the Netherlands, 10-13 June 2013 (2013)

Groundwater quality is spoiled by various substances resulting from human activities. In addition to pesticides, one of the most problematic substances is nitrate. Pumping prevention areas are strategic ... [more ▼]

Groundwater quality is spoiled by various substances resulting from human activities. In addition to pesticides, one of the most problematic substances is nitrate. Pumping prevention areas are strategic zones in terms of struggle against diffuse pollution by nitrate. In order to reduce diffuse pollution of waters by nitrate, different strategies of agricultural practices can be implemented. Their impact can be evaluated either by monitoring water quality or using an agro-hydrological model. The advantage of modelling is to be able to test long term impacts of implemented measures and impacts of complementary measures. Using EPICgrid distributed agro-hydrological model, we reproduced the current agricultural practices. We calculated nitrate leaching but also the nitrate stock in the root zone. These results were validated through a comparison with a lot of nitrogen stock measurements. (These measurements are compulsory in the Walloon context.) The nitrate concentration in pumping wells was also used to assess the efficiency of the model. After this calibration phase, we modelled several scenarios of more water-protective agricultural practices. Indeed, the Hesbaye galleries represent an important source of drinking water in the Walloon region, it is therefore highly probable that further mitigation measures are going to be imposed in the pumping prevention area. An increase in the area cultivated with cereals, a strong limitation of mineral fertilisation as well as a conversion to grasslands were tested and combined. The results of these simulations show how some agricultural practices scenarios can lead to an important decrease in diffuse pollution by nitrate. Prospective simulations taking into account possible future climate evolution (global change scenarios) are carried out to assess nitrate concentrations near the groundwater table for the deadlines of the WFD (2015, 2021 and 2027). Due to the transfer time through the vadose zone (more than 20 years in some subregions), it is showed that an increase in groundwater nitrate concentrations will occur, in some areas, until at least 2030 before new agricultural practices can impact positively the groundwater quality. [less ▲]

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See detailApplication of Ultrasonic Spectroscopy to Quantify Sedimentation of Polydisperse Emulsions
Aunyindee, I; Cano Castro, A; Chuttrakul et al

in Minisymposium der Verfahrenstechnik (2013)

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See detailComposite joints under M-N at elevated temperatures - Experimental investigations and analytical model
Demonceau, Jean-François ULg; Haremza, Cécile; Jaspart, Jean-Pierre ULg et al

in Proceeding of the Composite Construction VII conference (2013)

The Eurocodes recognise robustness as a way to ensure the structural integrity of a building frame subjected to an unforeseen event and therefore to avoid a so-called “progressive failure” mode in extreme ... [more ▼]

The Eurocodes recognise robustness as a way to ensure the structural integrity of a building frame subjected to an unforeseen event and therefore to avoid a so-called “progressive failure” mode in extreme loading situations. However few practical guidelines exist nowadays which would allow a designer to design a structure accordingly. Within the European RFCS ROBUSTFIRE project, the behaviour of steel and composite car parks subjected to localised fire leading to a column loss was investigated. Under such a scenario, the beam-to-column joints play a key role in the global structural response. Indeed, these joints, initially loaded in bending, may be subjected to elevated temperatures and to combined axial load “N” and bending moment “M”. In this paper, a methodology to predict the mechanical response of bolted composite beam-to-column joints at elevated temperatures under M-N is presented and validated through comparison to experimental tests conducted at the University of Coimbra. [less ▲]

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See detailThermal manipulations during embryogenesis induce long-lasting changes in the regulation of energy metabolism
Loyau, T.; Métayer-Coustard, S.; Crochet, S. et al

in Proceedings of the 6th Combined Workshop on Fundamental Physiology and Perinatal Development in Poultry (2013)

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See detailClassification of MCI and AD patients combining PET data and psychological scores
Segovia-Román, Fermín ULg; Bastin, Christine ULg; Salmon, Eric ULg et al

in International Workshop on Advances in Regularization, Optimization, Kernel Methods and Support Vector Machines: theory and applications (2013)

This study’s aim was to measure the advantages of using psychological test data in the automatic classification of functional brain images in order to assist the diagnosis of neurodegenerative disorders ... [more ▼]

This study’s aim was to measure the advantages of using psychological test data in the automatic classification of functional brain images in order to assist the diagnosis of neurodegenerative disorders such as Alzheimer’s disease (AD). Several computer-aided diagnosis systems for AD based on PET images were developed. Some of them used psychological scores beside the image data in the classification step and others did not. The results show the ones that take into account the psychological scores achieve higher accuracy rates. [less ▲]

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See detailGénéralisation Min Max pour l'Apprentissage par Renforcement Batch et Déterministe : Relaxations pour le Cas Général T Etapes
Fonteneau, Raphaël ULg; Ernst, Damien ULg; Boigelot, Bernard ULg et al

in 8èmes Journées Francophones de Planification, Décision et Apprentissage pour la conduite de systèmes (JFPDA'13) (2013)

Cet article aborde le problème de généralisation minmax dans le cadre de l'apprentissage par renforcement batch et déterministe. Le problème a été originellement introduit par [Fonteneau, 2011], et il a ... [more ▼]

Cet article aborde le problème de généralisation minmax dans le cadre de l'apprentissage par renforcement batch et déterministe. Le problème a été originellement introduit par [Fonteneau, 2011], et il a déjà été montré qu'il est NP-dur. Deux schémas de relaxation pour le cas deux étapes ont été présentés aux JFPDA'12, et ce papier présente une généralisation de ces schémas au cas T étapes. Le premier schéma fonctionne en éliminant des contraintes afin d'obtenir un problème soluble en temps polynomial. Le deuxième schéma est une relaxation lagrangienne conduisant également à un problème soluble en temps polynomial. On montre théoriquement que ces deux schémas permettent d'obtenir de meilleurs résultats que ceux proposés par [Fonteneau, 2011]. [less ▲]

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See detailActive network management: planning under uncertainty for exploiting load modulation
Gemine, Quentin ULg; Karangelos, Efthymios ULg; Ernst, Damien ULg et al

in Proceedings of the 2013 IREP Symposium - Bulk Power Systems Dynamics and Control - IX (2013)

This paper addresses the problem faced by a distribution system operator (DSO) when planning the operation of a network in the short-term. The problem is formulated in the context of high penetration of ... [more ▼]

This paper addresses the problem faced by a distribution system operator (DSO) when planning the operation of a network in the short-term. The problem is formulated in the context of high penetration of renewable energy sources (RES) and distributed generation (DG), and when flexible demand is available. The problem is expressed as a sequential decision-making problem under uncertainty, where, in the first stage, the DSO has to decide whether or not to reserve the availability of flexible demand, and, in the subsequent stages, can curtail the generation and modulate the available flexible loads. We analyze the relevance of this formulation on a small test system, discuss the assumptions made, compare our approach to related work, and indicate further research directions. [less ▲]

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See detailAssessment of landslides activity in Maily‐Say Valley, Kyrgyz Tien Shan
Schlögel, Romy; Fernandez-Steeger, Tomas; Braun, Anika et al

in Landslide Science and Practice (2013)

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See detailInfluence de facteurs environnementaux influençant la teneur en urée dans le lait de vache en Wallonie et estimation des rejets azotés
Dufrasne, Isabelle ULg; Knapp, Emilie ULg; Istasse, Louis ULg et al

in Vandenberghe, Christophe; Colinet, Gilles; Destain, Jean-Pierre (Eds.) et al 2ème Atelier Nitrate-Eau, évaluation du programme de gestion durable de l'azote (2013)

En Wallonie, les teneurs en urée du lait de tank sont déterminées dans toutes les fermes lors de chaque livraison à la laiterie par le comité du lait. Un total de 8295337 données récoltées pendant l'année ... [more ▼]

En Wallonie, les teneurs en urée du lait de tank sont déterminées dans toutes les fermes lors de chaque livraison à la laiterie par le comité du lait. Un total de 8295337 données récoltées pendant l'année 2000 et la période 2002-201 ont été analysées à l'aide d'un modèle linéaire. [less ▲]

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See detailAn Optimistic Posterior Sampling Strategy for Bayesian Reinforcement Learning
Fonteneau, Raphaël ULg; Korda, Nathan; Munos, Rémi

in NIPS 2013 Workshop on Bayesian Optimization (BayesOpt2013) (2013)

We consider the problem of decision making in the context of unknown Markov decision processes with finite state and action spaces. In a Bayesian reinforcement learning framework, we propose an optimistic ... [more ▼]

We consider the problem of decision making in the context of unknown Markov decision processes with finite state and action spaces. In a Bayesian reinforcement learning framework, we propose an optimistic posterior sampling strategy based on the maximization of state-action value functions of MDPs sampled from the posterior. First experiments are promising. [less ▲]

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See detailCONTROLLED AND AUTOMATIC MEMORY RETRIEVAL IN ALZHEIMER’S DISEASE
Bastin, Christine ULg; Genon, Sarah ULg; Willems, Sylvie ULg et al

in Proceedings of the 8th Panhellenic Interdisciplinary Conference of Alzheimer's Disease and Related Disorders (2013)

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See detailGerontechnologies: State of the art and technology validation
LEJEUNE, Christophe ULg

in Med@Tel : Global Telemedicine and eHealth updates (2013)

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See detailContrast enhanced nanoCT for 3D quantitative and spatial analysis of in vitro manufactured extracellular matrix in metallic tissue engineering scaffolds
Sonnaert, Maarten; Papantoniou, Ioannis; Geris, Liesbet ULg et al

in Abstract book User Meeting Bruker MicroCT 2013 (2013)

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See detailNumerical modeling and digital image correlation strain measurements of coated metal sheets submitted to large bending deformation
Duchene, Laurent ULg; Ben Bettaieb, Amine ULg; Tuninetti Vásquez, Victor ULg et al

in Proceedings of the 16th ESAFORM conference on Material Forming (2013)

The recently developed SSH3D solid-shell element, which is based on the Enhanced Assumed Strain (EAS) and the Assumed Natural Strain (ANS) techniques, is utilized for the modeling of a severe bending ... [more ▼]

The recently developed SSH3D solid-shell element, which is based on the Enhanced Assumed Strain (EAS) and the Assumed Natural Strain (ANS) techniques, is utilized for the modeling of a severe bending sheet forming process. To improve the element's ability to capture the through thickness gradients, a specific integration scheme was developed. In this paper, the performances of this element for the modeling of the T-bent process were assessed thanks to comparison between experimental and numerical results in terms of the strain field at the outer surface of the sheet. The experimental results were obtained by Digital Image Correlation. It is shown that a qualitative agreement between experimental and numerical results is obtained but some numerical parameters should be optimized to improve the accuracy of the simulation predictions. In this respect, the influence of the penalty coefficient of the contact modeling was analyzed. [less ▲]

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See detailArt on the lagoon: Eliasson at the Biennale of Venice
Szanto, Catherine ULg; Gay, Fabrizio; Ballarin, Matteo

in Newman, Conor; Nussaume, Yann; Pedroli, Bas (Eds.) Landscape and Imagination. Towards a new baseline for education in a changing world (2013)

The Biennales of Venice are not limited to exhibitions in national pavilions. Every year artists and architects choose to confront the site and more specifically, the lagoon. In the edition of 2005, the ... [more ▼]

The Biennales of Venice are not limited to exhibitions in national pavilions. Every year artists and architects choose to confront the site and more specifically, the lagoon. In the edition of 2005, the artist O. Eliasson proposed an installation (Your black horizon, 2005) where the visitors left the wide expanse and intense light of the lagoon to enter a darkened enclosed space with subtle light effects. These aesthetic experiences enhanced the visitors’ perception of light by changing the usual spatiality and temporality of colour. We will analyze the role of memory in the rite of the visit, and look at how the museal strategies of the artist create a play with spatial memory and sense of orientation in relation to the outdoor space of the lagoon. [less ▲]

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See detailBuilding an Annotated Corpus of Late Egyptian. The Ramses Project: Review and Perspectives
Polis, Stéphane ULg; Honnay, Anne-Claude ULg; Winand, Jean ULg

in Polis, Stéphane; Winand, Jean (Eds.) Texts, Languages & Information Technology in Egyptology. Selected papers from the meeting of the Computer Working Group of the International Association of Egyptologists (Informatique & Égyptologie), Liège, 6-8 July 2010 (2013)

This paper reviews the experience of the Ramses Project in constructing a richly annotated corpus of Late Egyptian that consists of 300 000 words in 2011 (and is expected to grow up to more than 1 million ... [more ▼]

This paper reviews the experience of the Ramses Project in constructing a richly annotated corpus of Late Egyptian that consists of 300 000 words in 2011 (and is expected to grow up to more than 1 million words in coming years). During the first five years of the project, this corpus has been encoded in hieroglyphic script, translated in French or English and received annotations for part-of-speech information, lemmatization, and morphological analysis. The methodology and working tools that have been developed in order to build this corpus are here discussed and future developments are presented. [less ▲]

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See detailProfiling workers’ activity-travel behavior based on mobile phone data
Liu, Feng; Janssens, Davy; Wets, Geert et al

in Proceedings of the Third International Conference on the Analysis of Mobile Phone Datasets (NetMob) (2013)

Activity-based micro-simulation models typically predict 24-hour activity-travel patterns for each individual in a study area. These patterns reflect the characteristics of the available transportation ... [more ▼]

Activity-based micro-simulation models typically predict 24-hour activity-travel patterns for each individual in a study area. These patterns reflect the characteristics of the available transportation infrastructure and land-use system as well as individuals’ lifestyles and needs. However, the lack of a reliable benchmark to evaluate the generated patterns has been a major concern. To address this issue, we explore the possibility of using mobile phone data to build such a validation measure. Our investigation consists of three steps. First, the daily trajectory of locations, where a user performed activities, is constructed from the mobile phone records. To account for the discrepancy between the movements revealed by the call data and the real traces that the user has made, the daily trajectories are then transformed into travel sequences. Finally, all the inferred travel sequences are classified into typical activity-travel patterns which, in combination with their relative frequencies, define a profile. The established profile represents the activity-travel behavior in the study area, and thus can be used as a benchmark for the validation of the activity-based models. By comparing the benchmark profiles derived from the call data with statistics that stem from activity-travel surveys, the validation potential is demonstrated. In addition, a sensitivity analysis is carried out to assess how the results are affected by the different parameter settings defined in the profiling process. [less ▲]

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See detailDéterminants de la masse grasse et de la masse maigre chez les prématurés
Simon, Laure; Frondas-Chauty, Anne; SENTERRE, Thibault ULg et al

in Société Française de Néonatologie (Ed.) XXèmes Journées Francophones de Recherche en Néonatologie (2013)

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See detailConsiderations about the optimum design of piano key weirs
Erpicum, Sébastien ULg; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Proceedings of Africa 2013 Conference (CD-Rom) (2013)

Piano Key Weirs, a recent innovation in the Labyrinth Weirs geometry, have been studied for years by several research centers and laboratories all over the world. The first prototypes have already been ... [more ▼]

Piano Key Weirs, a recent innovation in the Labyrinth Weirs geometry, have been studied for years by several research centers and laboratories all over the world. The first prototypes have already been built, mainly in France, and others are under construction in Vietnam, Algeria and India. Despite some general design equations have been proposed recently, no optimum geometry has been defined yet. Whatever its geometry, a PKW is more efficient than a standard linear weir of same width. It is also more efficient than a labyrinth weir with the same cycle shape. But the PKW geometry may appear as complex as it involves a large set of parameters. Optimization of the weir design is thus not straightforward. Using the results of a large number of systematic scale model tests carried out to analyse the effect of the main geometric parameters on the PKW discharge capacity, the paper shows how a single optimum design doesn’t exist. This is especially true when economic and technical criteria are considered instead of a single hydraulic performance criteria. Despite this observation, some general rules to design a PKW can be suggested, as well as considerations about the best value of the main ratios defining the structure geometry. The relative influence of these parameters on the PKW efficiency is also highlighted. [less ▲]

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See detailLes centres de langues universitaires à la croisée des chemins, face à la globalisation
Defays, Jean-Marc ULg

in DEVIVRY-PLARD; FAURE, Pascaline; BRUDERMANN, Cédric (Eds.) Apprendre les langues à l’Université au 21e siècle (2013)

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See detailDevelopment of organic farming in Wallonia
Burny, Philippe ULg; Debode, Frédéric

in Bran, Florina; Ioan, Ildiko; Maruntelu, Tudor-George (Eds.) et al 5th International Conference "Ecological performance in a competitive economy", Bucharest 7-8 March 2013 : proceedings (2013)

Belgium is a highly densely populated country where agricultural methods usually consume large quantities of inputs, including pesticides and chemical fertilizers. However, organic farming is practiced ... [more ▼]

Belgium is a highly densely populated country where agricultural methods usually consume large quantities of inputs, including pesticides and chemical fertilizers. However, organic farming is practiced since many years and has registered a significant development during the last years, reaching 7% of the number of farmers in Wallonia (South of Belgium) and 7% of the Walloon agricultural area. Presently, the Walloon Minister for Agriculture strongly supports this sector and has proposed a strategic development plan of organic farming, the target being to reach 14% of the Walloon agricultural area in 2020. This paper presents and discusses the situation of organic farming in Wallonia and the main features and challenges of the new strategic development plan. [less ▲]

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See detailRaymond De Becker : une certaine idée de la Belgique. Réflexions sur une identité nationale et culturelle
Lanneau, Catherine ULg

in Dard, Olivier; Deschamps, Etienne; Duchenne, Geneviève (Eds.) Raymond De Becker (1912-1969). Itinéraire et facettes d’un intellectuel réprouvé (2013)

Au fil de ses écrits des années trente – brochures, articles, tribunes libres –, Raymond De Becker (1912-1969), intellectuel et journaliste à la réputation aujourd'hui sulfureuse au vu de son parcours ... [more ▼]

Au fil de ses écrits des années trente – brochures, articles, tribunes libres –, Raymond De Becker (1912-1969), intellectuel et journaliste à la réputation aujourd'hui sulfureuse au vu de son parcours dans la collaboration, s’est beaucoup interrogé sur la Belgique et son histoire. Il est donc possible d’appréhender la mission qu’il lui assigne ou sa définition de l’union nationale mais, surtout, de décrypter l’analyse qu’il fait des rapports entre Flamands, Wallons et Bruxellois et de voir comment il articule cette analyse avec l’évolution de sa pensée sur la notion de race, d’ethnie et de nationalité. Soulever ces différentes questions conduit à interroger, mais en surface, son rapport aux pays voisins et sa vision de l’Europe et de l’Occident. Quelle Belgique idéale Raymond De Becker veut-il construire ? [less ▲]

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See detailStatistical tests for group comparison of manifold-valued data
Collard, Anne ULg; Phillips, Christophe ULg; Sepulchre, Rodolphe

in Proceedings of the 52nd IEEE Conference on Decision and Control (2013)

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See detailA multi-scale computational scheme for anisotropic hydro-mechanical couplings in saturated heterogeneous porous media
Mercatoris, Benoît ULg; Massart, T. J.; Sluys, L. J.

in Proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013 (2013)

This contribution discusses a coupled two-scale framework for hydro-mechanical problems in saturated heterogeneous porous geomaterials. The heterogeneous nature of such materials can lead to an anisotropy ... [more ▼]

This contribution discusses a coupled two-scale framework for hydro-mechanical problems in saturated heterogeneous porous geomaterials. The heterogeneous nature of such materials can lead to an anisotropy of the hydro-mechanical couplings and non-linear effects. Based on an assumed model of the mesostructure, the average macroscopic hydro-mechanical behaviour is extracted by means of a computational homogenisation procedure in a monolithic way. The ingredients needed to upscale the hydro-mechanical couplings are outlined. The two-scale simulation results are compared with direct numerical simulation for the consolidation of a particle-matrix porous material. [less ▲]

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See detailSatellitenbasiertes Kollisionsvermeidungssystem
Christen, Fréderic ULg; Katriniok, Alexander; Eckstein, Lutz et al

in Eckstein, Lutz; Tschöke, Helmut; Krahl, Jürgen (Eds.) et al Innovative Automobiltechnik IV (2013)

Gegenwärtig entwickelt die RWTH Aachen University im Rahmen des Projekts "Galileo above" (Anwendungszentrum für bodengebundenen Verkehr ) ein Kollisionsvermeidungssystem (Collision Avoidance System, CAS ... [more ▼]

Gegenwärtig entwickelt die RWTH Aachen University im Rahmen des Projekts "Galileo above" (Anwendungszentrum für bodengebundenen Verkehr ) ein Kollisionsvermeidungssystem (Collision Avoidance System, CAS) unter Einbeziehung von Galileo-Daten. Ziel des CAS ist - wie der Name suggeriert - Fahrzeuge zu erkennen, die sich auf Kollisionskurs mit dem eigenen Fahrzeug befinden und automatisch eine kollisionsvermeidende Maßnahme (Bremsen und/oder Lenken) einzuleiten, insofern der Fahrer nicht rechtzeitig reagiert. Der begrenzte Erfassungsbereich und die Einschränkungen, der die verwendete kosten-optimierte Sensorik unter unterschiedlichsten Umgebungsbedingungen unterliegt, sind häufig ein begrenzender Faktor für die Realisierbarkeit und Robustheit von Fahrerassistenzsystemen (FAS). Der Einsatz von GNSS (Global Navigation Satellite System) in Verbindung mit einer digitalen Karte und Fahrzeug-zu-Fahrzeug- bzw. Fahzeug-zu-Infrastruktur-Kommunikation bietet das Potenzial, den Erfassungsbereich der Sensorik deutlich zu erweitern und diese unter schwierigen Umgebungsbedingungen zu stützen. Für die Entwicklung des CAS wird das Galileo Testzentrum automotiveGATE in Al-denhoven genutzt. Das automotiveGATE erweitert das Aldenhoven Testing Center um sogenannte Pseudoliten (Pseudo-Satelliten), welche Galileo-ähnliche Navigati-onsdaten in einem begrenzten Gebiet ausstrahlen. Das automotiveGATE ermöglicht somit die Entwicklung und Erprobung von Galileo-basierten Applikationen vor der Inbetriebnahme des eigentlichen Galileo-Satellitennavigationssystems. Im Rahmen dieses Beitrags werden Erläuterungen zur Perzeption und Sensorfusion, zur Deeskalationsstrategie und Eingriffsentscheidung sowie zu Testergebnissen bei Auffahrsituationen des CAS gegeben. [less ▲]

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See detailInnovative Learning for Collaborative Design in Ergonomics
Folcher, Viviane; Zreik, Khaldoun; Ben Rajeb, Samia ULg et al

in Stouffs, Rudy; Sariyildiz, Sevil (Eds.) Computation and Performance (2013)

The proposed article deals with introducing collaborative architectural design into the training of ergonomists at the Master 2 level. The collaborative design workshop aims to confront ergonomists with ... [more ▼]

The proposed article deals with introducing collaborative architectural design into the training of ergonomists at the Master 2 level. The collaborative design workshop aims to confront ergonomists with the difficulties any design project involves, and which challenge architects, designers, engineers and so on: collaboration between people with different skills and different expertise; powerful time constraints; need for their work to converge; working together and/or at a distance; sharing documents; decision-making, etc. The article will present a short review of work carried out in the domains of architecture and design, and of the contribution of ergonomics within architectural projects. We shall then present the workshop’s educational aims, and give details of the way it functioned. Finally, observation results will be presented and discussed. [less ▲]

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See detailFlowOS: A Programmable Platform for Commodity Hardware Middleboxes
Abdul, Alim; Bezahaf, Mehdi; Mathy, Laurent ULg

in Proceedings of CFI 2013 (2013)

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See detailDevelopment of a simplified measuring procedure for ammonia emission from agricultural constructions
Vranken, Erik; Cabaraux, Jean-François ULg; Berckmans, Daniel

in Berckmans, D.; Vandermeulen, J. (Eds.) Precision Livestock Farming ‘13 (2013)

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See detailSeeing the corona with the solar probe plus mission: the wide-field imager for solar probe+ (WISPR)
Vourlidas, A.; Howard, R. A.; Plunkett, S. P. et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2013)

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See detailGrammatical Markers and Grammatical Relations in the Simple Clause in Old French
Mazziotta, Nicolas ULg

in Hajičovà, Eva; Gerdes, Kim; Wanner, Leo (Eds.) Proceedings of the Second International Conference on Dependency Linguistics (DepLing 2013) (2013)

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See detailPossibilities and limitations of the Prevost model for the modelling of cohesionless soil cyclic behaviour
Cerfontaine, Benjamin ULg; Charlier, Robert ULg; Collin, Frédéric ULg

in Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering (2013)

The Prevost’s model is currently used to model cyclic behaviour of soils especially in earthquake engineering. The original model is able to capture the main features of cyclic behaviour: pore pressure ... [more ▼]

The Prevost’s model is currently used to model cyclic behaviour of soils especially in earthquake engineering. The original model is able to capture the main features of cyclic behaviour: pore pressure build up and plastic deformation accumulation. But accurate modelling of laboratory tests requires improvements. Enhanced models exist but require a lot of parameters that make them cumbersome for practical purpose. A suction caisson, part of a tripod offshore foundation for wind turbines is modelled. Possibilities of the Prevost’s model are highlighted compared with a classical Drucker-prager model. [less ▲]

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See detailLocalizing and comparing weight maps generated from linear kernel machine learning models
Schrouff, Jessica ULg; CREMERS, Julien ULg; GARRAUX, Gaëtan ULg et al

in 2013 Third International Workshop on Pattern Recognition in NeuroImaging (PRNI 2013): proceedings (2013)

Recently, machine learning models have been applied to neuroimaging data, allowing to make predictions about a variable of interest based on the pattern of activation or anatomy over a set of voxels ... [more ▼]

Recently, machine learning models have been applied to neuroimaging data, allowing to make predictions about a variable of interest based on the pattern of activation or anatomy over a set of voxels. These pattern recognition based methods present undeniable assets over classical (univariate) techniques, by providing predictions for unseen data, as well as the weights of each voxel in the model. However, the obtained weight map cannot be thresholded to perform regionally specific inference, leading to a difficult localization of the variable of interest. In this work, we provide local averages of the weights according to regions defined by anatomical or functional atlases (e.g. Brodmann atlas). These averages can then be ranked, thereby providing a sorted list of regions that can be (to a certain extent) compared with univariate results. Furthermore, we defined a “ranking distance”, allowing for the quantitative comparison between localized patterns. These concepts are illustrated with two datasets. [less ▲]

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See detailWorkshops as tools for creative collaboration: finding a balance between facilitation and auto-organization
Elsen, Catherine ULg; Cornet, Adeline; Antoine, Mélanie

in Proceedings of Co-Create 2013 (2013)

This paper analyses four settings of so-called collaborative “creative workshops” (their methods, logistics, regulation processes) and provide peepholes on their respective features, with the informed ... [more ▼]

This paper analyses four settings of so-called collaborative “creative workshops” (their methods, logistics, regulation processes) and provide peepholes on their respective features, with the informed goals of defining criteria for comparison, finding shared essence and distinctive characteristics. Key aspects such as time, facilitation and auto-organization shape a “creative continuum” that formalizes how creativity can be stimulated and how participants might collaboratively develop creative behaviors. [less ▲]

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See detailIntegration of Inland Waterway Transport in the Intermodal Supply Chain: a Joint Research Agenda
Caris, An; Limbourg, Sabine ULg; Macharis, Cathy et al

in Rigo, Philippe; Wolters, Milou (Eds.) Proceedings of the PIANC SMART Rivers Conference 2013 (2013)

This paper identifies research opportunities which will enable the further integration of inland waterway transport in the intermodal supply chain. Intermodal transport may be interpreted as a chain of ... [more ▼]

This paper identifies research opportunities which will enable the further integration of inland waterway transport in the intermodal supply chain. Intermodal transport may be interpreted as a chain of actors who supply a transport service. Inland navigation can play a crucial role in increasing supply chain service performance. A first group of research challenges has the objective to encourage efficient operations in IWT: development of a system wide model for IWT, integration of operational planning systems and analysis of bundling networks. A second group of research efforts is directed towards shippers and consignees who use the intermodal transport chain to send or receive their goods: further development of models that integrate intermodal transport decisions with supply chain decisions and creation of green supply chains. A third group of research challenges concerns the problem domain of external cost calculations. Finally detailed time series data on freight transport should be collected to support these future research tracks. [less ▲]

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See detailLe corps dans la médecine des moines au Moyen Age : autour de quelques Régimes de santé monastiques
Xhayet, Geneviève ULg

in Hüe, Denis; De Gramont, Jérôme; Baillaud, Bernard (Eds.) Corps et encyclopédies : Actes du colloque de Cerisy, 10-14 septembre 2008 (2013)

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See detailL’imaginaire linguistique des historiens de la littérature, en France et en périphéries
Provenzano, François ULg

in Moussa, Sarga (Ed.) Le XIXe siècle et ses langues (2013)

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See detailCharacterisation of cyclicity and relative sea-level fluctuations using magnetic susceptibility, Late Devonian (Frasnian) Hull platform, Canning Basin, Australia.
Da Silva, Anne-Christine ULg; George; Chow et al

in Whalen; Osadetz; Richards (Eds.) et al IGCP-580/596, Geophysical and Geochemical techniques : a window on the Paleozoic world, Abstract book (2013)

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See detailDe la signification du Noaillien et du Rayssien
Touzé, Olivier ULg

in de la Heras, Carmen; Lasheras, José Antonio; Arrizabalaga, Alvaro (Eds.) et al Pensando el Gravetiense: nuevos datos para la región cantábrica en su contexto peninsular y pirenaico (2013)

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See detailSurface properties of concrete and criteria for adhesion of repair systems
Courard, Luc ULg; Garbacz, Andrzej; Piotrowski, Tomasz et al

in Van Gemert, Dionys; Kabashi, Naser; Nushi, Violeta (Eds.) et al Proceedings of the 1st Symposium on Polymers in Concrete (2013)

Before any repair operation, an effective assessment of the concrete substrate has to be performed. Usually next to the surface reparation of concrete, evaluation of the cohesion of the superficial ... [more ▼]

Before any repair operation, an effective assessment of the concrete substrate has to be performed. Usually next to the surface reparation of concrete, evaluation of the cohesion of the superficial concrete is requested for adhesion and durability reasons. Many authors describe the influence of the surface preparation technique on the superficial cohesion of concrete or the adhesion. However, the real effects of surface preparation technique only begin to be investigated in terms of superficial microcracking or roughness quantification. This project was performed in regards to the influence of concrete substrate strength and preparation technique efficiency. The effect of the concrete removal/preparation technique is most likely dependent upon the nature and the quality of the concrete substrate. Preparation techniques are compared from the point of view of concrete removing but also potential deterioration. The visual observation of the concrete surfaces indicates that the high pressure water jetting technique induces a particular texture characterized by large waves mostly parallel to the water flow. The concrete slabs have afterwards been covered with a Self-Compacting Repair Mortar and adhesion has been characterized. [less ▲]

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See detailApports des configurations spatiales augmentées aux activités de formation par projet
Ben Rajeb, Samia ULg; Leclercq, Pierre ULg

in van de Leemput, Cécile; Chauvin, Christine; Hellemans, Catherine (Eds.) Activités humaines, technologies et bien être (2013)

Cet article présente et discute l’analyse des implications de quatre configurations spatiales augmentées (CSA) sur des activités collaboratives en formation par projet. Ces configurations sont permises ... [more ▼]

Cet article présente et discute l’analyse des implications de quatre configurations spatiales augmentées (CSA) sur des activités collaboratives en formation par projet. Ces configurations sont permises grâce au dispositif Studio Digital Collaboratif, dont le logiciel SketSha (Sketch Sharing) permet le partage d’annotations et de documents graphiques à distance et en temps réel. L’analyse de ces implications est conduite ici de façon qualitative et selon quatre axes, mettant en évidence leurs atouts et limitations : - la réalisation de soi : développement des compétences en situations de conception collaborative; - la production collective : requalification du document comme objet intermédiaire pour la collaboration; - les relations entre les acteurs : reconsidération de la hiérarchie et émergence d'une synchronisation cognitive; - la requalification des espaces de travail : remise en cause de la dichotomie co-présence / à distance dans les collaborations synchrones. [less ▲]

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See detailA journey across scales, borders and data sources: minimum commute distance (MCD) analysis of home-to-work trips in Belgium
Teller, Jacques ULg; Cools, Mario ULg

in Hesse, Markus; Caruso, Geoffrey; Gerber, Philippe (Eds.) et al Proceedings of the BIVEC-GIBET Transport Research Days 2013 (2013)

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See detailUpbrella and BIM: Rethinking the construction process in residential construction
Forgues, Daniel; Schmitz, Dimitri ULg; Tahrani, Souha

in Hajdu, Miklos; Skibniewski, Miroslaw (Eds.) Proceedings Creative Construction Conference 2013 (2013)

The problems of productivity, predictability and quality in design and delivery of the building product are well documented. Prefabrication, process reengineering and digitalization are proposed as ... [more ▼]

The problems of productivity, predictability and quality in design and delivery of the building product are well documented. Prefabrication, process reengineering and digitalization are proposed as potential solutions to address these issues. One issue that is rarely addressed, however, is the management of the changes required to move from existing to a new paradigm of practices. Organization of work in construction, as opposed to other industries, has barely evolved in the last centuries. The research project studies the impact of the introduction of a new high-rise building construction system and BIM related technologies on the organization of work within a multi- residential project. The aim is to develop a concept of operation on how to reorganize work process within and between practices and trades. Ethnographic methods were used to identify issues regarding the management of information, the organization of work and the perceptions regarding BIM associated technologies and tools such as electronic tablets. Benchmarking and lean production tools such as value stream mapping were also utilized to identify problems of productivity and waste. Waste related to poor management of workflows and information flow was a major issue and had a strong impact on productivity. Contractual context in which there are no incentives for professionals and trades to improve their overall performance (no share responsibilities and fragmented obligations) was identified as the principal obstacle to changes in existing practices. Traditional project management practices proved to be inefficient to compensate the lack of coordination and collaboration between the project stakeholders. However, even if the use of BIM proved to be impractical in this context, tablets were well received as a way to improve collaboration and coordination of the work. A concept of operation was derived from the lessons learned that will be validated in the next pilot project. [less ▲]

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See detailAggregating Optimistic Planning Trees for Solving Markov Decision Processes
Kedenburg, Gunnar; Fonteneau, Raphaël ULg; Munos, Rémi

in Advances in Neural Information Processing Systems 26 (2013) (2013)

This paper addresses the problem of online planning in Markov decision processes using a randomized simulator, under a budget constraint. We propose a new algorithm which is based on the construction of a ... [more ▼]

This paper addresses the problem of online planning in Markov decision processes using a randomized simulator, under a budget constraint. We propose a new algorithm which is based on the construction of a forest of planning trees, where each tree corresponds to a random realization of the stochastic environment. The trees are constructed using a “safe” optimistic planning strategy combining the optimistic principle (in order to explore the most promising part of the search space first) with a safety principle (which guarantees a certain amount of uniform exploration). In the decision-making step of the algorithm, the individual trees are aggregated and an immediate action is recommended. We provide a finite-sample analysis and discuss the trade-off between the principles of optimism and safety. We also report numerical results on a benchmark problem. Our algorithm performs as well as state-of-the-art optimistic planning algorithms, and better than a related algorithm which additionally assumes the knowledge of all transition distributions. [less ▲]

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See detailScientific and Technological Payloads Aboard the B3LSat CubeSat of the QB50 Network
Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg; Delabie, Tjorven et al

in Proceedings of the 2nd IAA Conference on University Satellite Missions and Cubesat Workshop (2013)

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See detailLexicografía e informática: sí, pero... / Lexicographie et informatique: oui, mais...
Baiwir, Esther ULg

in Ruiz Miyares, Leonel; Álvarez Silva, María Rosa; Muñoz Alvarado, Alex (Eds.) Actualizaciones en Comunicación Social - Vol. 1 (2013)

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See detailDynamic Computation and Design of a World’s Record Death-Ride
Denoël, Vincent ULg; Canor, Thomas ULg; Demanet, Johan

in Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (2013)

A death-ride is a long cable anchored between two dead ends, allowing the crossing of wide valleys. Besides these mobility purposes, it is also operated in rescue operations, or simply for leisure. From a ... [more ▼]

A death-ride is a long cable anchored between two dead ends, allowing the crossing of wide valleys. Besides these mobility purposes, it is also operated in rescue operations, or simply for leisure. From a serviceability viewpoint, a death-ride design should offer a comfortable and/or enjoyable journey to the riders, which is typically expressed in terms of maximum velocity. From a strength viewpoint, a death-ride should be designed in order to safely withstand the cable self-weight, wind forces, the rider’s load and at last but not least, the initial tension in the cable. Actually, the tensioning operation is usually subtle. Indeed, in case of a loose cable, the rider may be stopped in the in-span sagging area. Conversely a too tight cable will generate large stresses but also large outlet velocity at the end of the ride. The design of a death-ride is a tradeoff between all these aspects. The paper presents the dynamic model that was used for the design of a 1.2km long death-ride, with an only 10-mm diameter, a constraint fixed in the very first stages of this project for compatibility reasons, with the existing equipment. This death-ride, built and used in May 2010 in a Grimp competition [1], has a world record of the longest death-ride in urban area. The structural part of the dynamic model is rather common, with a co-rotational description of the cable by means of a chain-like model [2]. An interesting feature, however, concerns the interaction between the rider and the cable. In fact, because the pulley is rolling on the cable, the position of the force acting on the cable, resulting from the ride, depends on the rider’s velocity, which itself depends on the cable inclination. This coupling is solved in a staggered manner, and the details of the algorithm are given in the full paper. In some limiting cases, a comparison with analytical solutions is also provided, where these analytical solutions are available [3]. Experimental validation and observation of the operated death-ride will also be presented. [less ▲]

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