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See detailArtificial Abelian gauge potentials induced by dipole-dipole interactions between Rydberg atoms
Cesa, Alexandre ULg; Martin, John ULg

Poster (2014, March 19)

We analyze the influence of dipole-dipole interactions between Rydberg atoms on the generation of Abelian artificial gauge potentials and fields. When two Rydberg atoms are driven by a uniform laser field ... [more ▼]

We analyze the influence of dipole-dipole interactions between Rydberg atoms on the generation of Abelian artificial gauge potentials and fields. When two Rydberg atoms are driven by a uniform laser field, we show that the combined atom-atom and atom-field interactions give rise to nonuniform, artificial gauge potentials. We identify the mechanism responsible for the emergence of these gauge potentials. Analytical expressions for the latter indicate that the strongest artificial magnetic fields are reached in the regime intermediate between the dipole blockade regime and the regime in which the atoms are sufficiently far apart such that atom-light interaction dominates over atom-atom interactions. We discuss the differences and similarities of artificial gauge fields originating from resonant dipole-dipole and van der Waals interactions. We also give an estimation of experimentally attainable artificial magnetic fields resulting from this mechanism and we discuss their detection through the deflection of the atomic motion. [less ▲]

Detailed reference viewed: 23 (10 ULg)
See detailArtificial grammar learning and amnesia
Meulemans, Thierry ULg; Van der Linden, Martial ULg

in French, Robert; Cleeremans, Axel (Eds.) Implicit learning and consciousness : an empirical, philosophical, and computational consensus in the making (2002)

Detailed reference viewed: 23 (3 ULg)
See detailArtificial insemination and embryo transfer as efficient tools to better control infectious diseases transmission
Gonzalez, F; Cabrera, F; Rodriguez, N et al

in Proceeding of artificial insemination and embryo transfer as efficient tools to better control infectious diseases transmission (2002, October 10)

Detailed reference viewed: 2 (0 ULg)
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See detailArtificial intelligence applied to on-line transient stability assessment of electric power systems
Wehenkel, Louis ULg; Van Cutsem, Thierry ULg; Pavella, Mania ULg

in Proc. 25th IEEE Conf. on Decision and Control (CDC) (1986)

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See detailArtificial intelligence design for real-time strategy games
Safadi, Firas ULg; Fonteneau, Raphaël ULg; Ernst, Damien ULg

in NIPS Workshop on Decision Making with Multiple Imperfect Decision Makers (2011, December)

For now over a decade, real-time strategy (RTS) games have been challenging intelligence, human and artificial (AI) alike, as one of the top genre in terms of overall complexity. RTS is a prime example ... [more ▼]

For now over a decade, real-time strategy (RTS) games have been challenging intelligence, human and artificial (AI) alike, as one of the top genre in terms of overall complexity. RTS is a prime example problem featuring multiple interacting imperfect decision makers. Elaborate dynamics, partial observability, as well as a rapidly diverging action space render rational decision making somehow elusive. Humans deal with the complexity using several abstraction layers, taking decisions on different abstract levels. Current agents, on the other hand, remain largely scripted and exhibit static behavior, leaving them extremely vulnerable to flaw abuse and no match against human players. In this paper, we propose to mimic the abstraction mechanisms used by human players for designing AI for RTS games. A non-learning agent for StarCraft showing promising performance is proposed, and several research directions towards the integration of learning mechanisms are discussed at the end of the paper. [less ▲]

Detailed reference viewed: 170 (9 ULg)
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See detailAn Artificial Intelligence Framework for On-Line Transient Stability Assessment of Power Systems
Wehenkel, Louis ULg; Van Cutsem, Thierry ULg; Pavella, Mania ULg

in IEEE Transactions on Power Systems (1989), 4(2), 789-800

A framework is proposed to tackle the online transient stability problem of power systems. Based on artificial intelligence, it successively makes use of an inductive inference method to build decisions ... [more ▼]

A framework is proposed to tackle the online transient stability problem of power systems. Based on artificial intelligence, it successively makes use of an inductive inference method to build decisions automatically and a deductive inference method to apply them online. The authors lay the foundations of an inductive inference method, where the rules explicitly relate a system's stability with relevant parameters of it. A simple but realistic power system is treated to illustrate important features of the method and to suggest how the derived decision rules could be used online. [less ▲]

Detailed reference viewed: 54 (3 ULg)
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See detailAn artificial neural network analysis of factors controlling ecosystem metabolism in the coastal ocean
Rochelle Newall, Emma J.; Winter, Christian; Barrón, Cristina et al

in Ecological Applications (2007), 17(5), 185196

Knowing the metabolic balance of an ecosystem is of utmost importance in determining whether the system is a net source or net sink of carbon dioxide to the atmosphere. However, obtaining these estimates ... [more ▼]

Knowing the metabolic balance of an ecosystem is of utmost importance in determining whether the system is a net source or net sink of carbon dioxide to the atmosphere. However, obtaining these estimates often demands significant amounts of time and manpower. Here we present a simplified way to obtain an estimation of ecosystem metabolism. We used artificial neural networks (ANNs) to develop a mathematical model of the gross primary production to community respiration ratio (GPP:CR) based on input variables derived from three widely contrasting European coastal ecosystems (Scheldt Estuary, Randers Fjord, and Bay of Palma). Although very large gradients of nutrient concentration, light penetration, and organic-matter concentration exist across the sites, the factors that best predict the GPP:CR ratio are sampling depth, dissolved organic carbon (DOC) concentration, and temperature. We propose that, at least in coastal ecosystems, metabolic balance can be predicted relatively easily from these three predictive factors. An important conclusion of this work is that ANNs can provide a robust tool for the determination of ecosystem metabolism in coastal ecosystems. [less ▲]

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See detailArtificially generating sediment incipient motion in natural conditions
Gob, Frédéric ULg; Houbrechts, Geoffrey ULg; Linares Carreté, Alba et al

Poster (2010)

Incipient motion thresholds for gravel bed rivers are studied in flumes and natural rivers. Flume studies allow variables such as channel slope, water velocity, water depth, sediment size and sediment ... [more ▼]

Incipient motion thresholds for gravel bed rivers are studied in flumes and natural rivers. Flume studies allow variables such as channel slope, water velocity, water depth, sediment size and sediment composition to be controlled. Meanwhile, in the field, the incipient motion of particles is studied in natural conditions allowing the structure of the bed and the flood characteristics to be considered. Though much less developed, an intermediate possibility also exists. By artificially accelerating near bottom velocity of the water flow in a small portion of the bed, it is possible to initiate sediment transport. This allows sediment incipient motion to be observed in natural conditions while controlling the water velocities. The Cemagref (HHLY) has developed a device which confines water flow in a small tunnel on the bottom of the riverbed. It was developed in order to create a boundary layer similar to the one generated by natural flow. Water is injected into a filter which smoothes the flow before it enters a Plexiglas tunnel where sediment motion is observed. The flow is accelerated by two large pumps that allow flow velocities of up to 2.5 m/s in a small area 40 cm long, 20 cm wide and 12 cm high. As the water flow is confined, large scale turbulence similar to that occurring in natural rivers cannot be reproduced using the device. The velocity profile in the tunnel is stable and in equilibrium with the riverbed. Sediment motion was observed using this device on three Belgian gravel bed rivers (3.5 cm <D50<8 cm). The incipient critical velocities measured were coherent in the three rivers sampled, ranging between 1.3 m/s and 1.7 m/s. A progressive increase in velocity in the tunnel permitted size selective entrainment to be observed. Analysis of the particle entrainment schemes and associated velocities allowed the role played by the armoured layer and the Di/D50 ratio to be more fully understood. Critical velocities measured using the device were also compared to critical velocities observed in natural conditions, determined during several pebble tracing campaigns. This revealed that incipient motion velocities of the largest particles recorded in artificial conditions were systematically larger than those observed in natural conditions. This demonstrates the roles played by large scale turbulence and the vertical component of the flow velocity in single particle entrainment. Due to its inherent characteristics, both of these flow components are weak in the artificial conditions generated by the device. In conclusion, our study demonstrates that this type of device is a useful tool in observing and studying incipient motion processes and, in particular, the role played by the bed structure (armouring, protrusion, etc.). However, some improvements are still required in order to more accurately measure critical velocities, allowing critical discharges to be determined. [less ▲]

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See detailL’artillerie dans le discours politique aux confins des XVe–XVIe siècles : le cas français
Dumont, Jonathan ULg

Scientific conference (2014, April 26)

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailArtisanal gill-net fishery catches of the catfish, Schilbe intermedius (Tleostei:Schilbeidae), in two tributaries of the Ouémé River, Benin, West Africa
Laleyé, Philippe; Salako, Osmane; Chikou, Antoine et al

in African Journal of Aquatic Science (2005), 30(2), 163-166

Detailed reference viewed: 18 (4 ULg)
See detailArtisanat et économie du fer en France méditerranéenne de l’Antiquité au début du Moyen Âge : une approche interdisciplinaire
Pagès, Gaspard ULg

Book published by éditions monique mergoil (2010)

L’Auteur propose ici un panorama de l'artisanat et de l'économie du fer autour des rivages français de la Méditerranée, sur la longue durée. La démarche archéologique intègre une approche archéométrique ... [more ▼]

L’Auteur propose ici un panorama de l'artisanat et de l'économie du fer autour des rivages français de la Méditerranée, sur la longue durée. La démarche archéologique intègre une approche archéométrique spécialement adaptée à l’analyse de la sidérurgie ancienne, utilisant métallographie et pétrographie. La question est traitée dans son ensemble, non seulement sur la base des connaissances déjà acquises, à partir d’inventaires bibliographiques précis, mais aussi à partir des études inédites et détaillées de douze contextes métallurgiques « témoins », significatifs de problématiques propres. Ils sont documentés par l’ensemble des données archéologiques et, spécialement, sur la base d’une description rigoureuse des aménagements, du tri de près de 28 000 pièces métallurgiques – objets et scories – et de l’analyse archéométrique de 169 d’entre elles. L’ouvrage se structure autour des trois grandes activités qui se dégagent de la chaîne opératoire de la métallurgie du fer directe : la production du matériau fer (la réduction directe du minerai), la fabrication des objets (forgeage) et le commerce du matériau fer sous une forme semi-finie (la circulation des demi-produits). Ainsi, à travers l’évolution de ces trois types d’activités économiques, il met en évidence les choix et les comportements qui ont été adoptés pour un même exercice, des cadres antiques à l’orée de la réforme carolingienne pour, finalement, contribuer à une meilleure connaissance de l’économie et de la société entre l’époque romaine et le début du Moyen Âge en Gaule du Sud. [less ▲]

Detailed reference viewed: 19 (2 ULg)
See detailLes artisans-producteurs face aux problèmes de conservation.
Sindic, Marianne ULg; Rolland, Sandrine

in Dieta (2000), (20), 6-7

Detailed reference viewed: 10 (0 ULg)
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See detailL'artiste belge entre le mot et l'image (quelques éléments de comparaison entre Hergé, Michaux, Magritte)
Defays, Jean-Marc ULg

in Texte : Revue de Critique et de Théorie Littéraire (1997), 21-22

Detailed reference viewed: 22 (1 ULg)
See detailL'artiste commissaire : cycle de 4 conférences à L'ISELP
Bawin, Julie ULg

Conference given outside the academic context (2009)

Detailed reference viewed: 8 (2 ULg)
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See detailL’artiste commissaire : postures et statuts
Bawin, Julie ULg

in 8e congrès de l’Association des cercles francophones d’histoire et d’archéologie de Belgique (2010)

Detailed reference viewed: 83 (8 ULg)
See detailL’artiste commissaire
Bawin, Julie ULg

Scientific conference (2013, December 19)

Detailed reference viewed: 14 (3 ULg)
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See detailL'artiste commissaire
Bawin, Julie ULg

Conference (2010)

Detailed reference viewed: 10 (1 ULg)