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See detailLa nationalité et l'accès au notariat
Onclin, François ULg

in Chroniques notariales (vol. 57) (2013, April)

Ce court flash évoque plusieurs arrêts prononcés le 24 mai 2011 par la Cour de justice de l'Union européenne (CJUE) à propos de la condition de nationalité pour l'accès à la profession de notaire dans les ... [more ▼]

Ce court flash évoque plusieurs arrêts prononcés le 24 mai 2011 par la Cour de justice de l'Union européenne (CJUE) à propos de la condition de nationalité pour l'accès à la profession de notaire dans les Etats membres [less ▲]

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See detailTowards a better understanding of the respiratory distress syndrome in full-term newborn calves
Rollin, Frédéric ULg; Guyot, Hugues ULg

in XVIII Congreso Internacional Anembe de Medicina Bovina (2013, April)

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See detailL'actualité en matière de sanctions d'urbanisme
Onclin, François ULg

in Chroniques notariales (vol. 57) (2013, April)

Cette contribution fait le point sur l'actualité (principalement jurisprudentielle) récente en matière de sanctions d'urbanisme

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See detailON THE MODELING OF ADHESIVE CONTACT AND STICTION FAILURE IN MICRO-SWITCHES
Wu, Ling ULg; Noels, Ludovic ULg; Golinval, Jean-Claude ULg

in Ouisse (FEMTO-ST – ENSMM, France); Deü (CNAM, FR), J.F. (Eds.) MEDYNA 2013 Proceedings (2013, April)

Undesirable stiction, which results from contact between surfaces, is a major failure mode in micro-switches. Indeed the adhesive forces can become so important that the two surfaces remain permanently ... [more ▼]

Undesirable stiction, which results from contact between surfaces, is a major failure mode in micro-switches. Indeed the adhesive forces can become so important that the two surfaces remain permanently glued, limiting the life-time of the MEMS. This is especially true when contact happens between surfaces where elasto-plastic asperities deform permanently until the surfaces reach plastic accommodation, increasing the surface forces. To predict this behavior, a micro adhesive-contact model is developed, which accounts for the surfaces topography evolutions during elasto-plastic contacts. This model can be used at a higher scale to study the MEMS behavior, and thus its life-time. For illustration purpose, an electrostatic-structural analysis is performed on a micro-switch. [less ▲]

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See detailEffect of current flow on bipolar plate/gas diffusion layer interfacial contact resistance in Proton Exchange Membrane fuel cells (PEMFC)
Stergiopoulos, Vaios ULg; Lafort, Adeline; Maseri, Fabrizio et al

in Proceedings of the Fundamentals and Development of Fuel cells 2013 conference (2013, April)

Stainless steel bipolar plates can be excellent alternative to graphite bipolar plates since they display better mechanical properties and the manufacturing procedure is easier and cheaper. However, they ... [more ▼]

Stainless steel bipolar plates can be excellent alternative to graphite bipolar plates since they display better mechanical properties and the manufacturing procedure is easier and cheaper. However, they are chemically instable in the corrosive environment of PEMFCs, and a thin oxide layer is developed on the plate’s surface. This layer causes a significant increase in the interfacial contact resistance (ICR) between the plates and gas diffusion layers. In an effort to characterize various stainless steel samples, before and after their exposure to the corrosive environment of a PEMFC, the interfacial contact resistance (ICR) between the plates and a commercial gas diffusion layer (GDL) was studied as a function of the pressure applied on the assembly. The ICR was studied in the range of 0-500 N/cm2 of pressure applied to the assembly; the ICR value was determined by means of galvanostatic potentiometry, where a constant current is applied to the assembly and the average value of the potential over time is recorded. The ICR is then calculated, after appropriate simplifications, as: ICR = Rtot = Iapplied / Vmonitored (1) It was observed that, besides the expected exponential reduction of ICR versus pressure, the value of the current applied to the assembly impacted greatly the obtained values for the ICR, irrespective of the applied pressure. This indicates that the observed phenomenon is not caused by any morphological changes on the interface. A possible explanation is that, at higher currents, the temperature increases locally due to ohmic heating, inducing thus changes in the GDL’s resistivity. [less ▲]

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See detailA nation-wide project for the revision of the Belgian Nursing Minimum Dataset: from concept to implementation
THONON, Olivier ULg

in Proceedings of the Saudi International Conference of Excellence in Patient Care -Saudi Organizer Co. (2013, April)

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See detailOptimized Schwarz Algorithm with Double Sweep Preconditioner for the Helmholtz Equation
Vion, Alexandre ULg; Geuzaine, Christophe ULg

in Proceedings of the 9th International Symposium on Electric and Magnetic Fields, EMF 2013 (2013, April)

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See detailPreliminary Characterization of monovarietal virgin olive oils produced in eastern area of Morocco
Mansouri, F.; Ben Moumen, A.; Lopez, G. et al

in Book of Proceedings InsideFood Symposium (2013, April)

Traditional olive oil production is limited by its high cost, mainly due to labour expenses for harvesting and pruning. New olive cultivars (e.g. Arbequina, Arbosana, Koroneiki) with greater adaptability ... [more ▼]

Traditional olive oil production is limited by its high cost, mainly due to labour expenses for harvesting and pruning. New olive cultivars (e.g. Arbequina, Arbosana, Koroneiki) with greater adaptability to modern irrigated high-density orchards and producing good quality olive oils are highly demanded by an olive oil industry in continuous change The aim of this study is the characterization of monovarietal virgin olive oils from three cultivars (Arbequina, Arbosana and Koroneiki) recently introduced in east of Morocco, and the comparison with traditional local Picholine Marocaine olive oil. Several analytical parameters were evaluated; including quality index, Triacylglycerol, fatty acids, phenolic and chlorophyll contents and oxidative stability. Significant differences between the analysed olive oils were detected. Olive oils from Koroneiki and Arbosana cultivars had higher values of oleic acid (respectively 76.24 and 75.68 %); Picholine olive oil, had the lowest one 67.49%. Koroneiki olive oil was noteworthy for its higher content of phenolic compounds (459.48 mg/ kg) and a high oxidative stability (93.16 h). We concluded that the recently introduced cultivars are well adapted to the eastern area of Morocco and could be of great interest for producing monovarietal olive oils. [less ▲]

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See detailTrace Minerals Management in Cattle
Rollin, Frédéric ULg; Guyot, Hugues ULg

in XVIII Congreso Internacional Anembe de Medicina Bovina (2013, April)

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See detailTendinopathies et lésions particulières de la cheville et du pied du sportif
Crielaard, Jean-Michel ULg; Kaux, Jean-François ULg

in Abstract book du 21ème Séminaire hivernal de Médecine sportive 2013 (2013, April)

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See detailThérapeutiques récentes des tendinopathies du sportif (ondes de choc, injections de plaquettes, ...)
Crielaard, Jean-Michel ULg; Kaux, Jean-François ULg

in Abstract book du 21ème Séminaire hivernal de Médecine sportive 2013 (2013, April)

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See detailTheorical study of a volumetric hot air Joule cycle engine
Oudkerk, Jean-François ULg; Lemort, Vincent ULg

in Proceedings of the 3rd International Conference on Microgeneration and Related Technologies (2013, April)

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See detailPanorama des migrations en région liégeoise : aspects économiques, culturels et politiques
Molina Marmol, Maïté ULg

in Migrations in the Waloon Region (2013, April)

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See detailConception des pseudo-articulations à col paraboique
Debongnie, Jean-François ULg

in Agiuzoul, Mohammed (Ed.) 11ème Congrès de Mécanique - Actes du Congrès (2013, April)

The elastic behaviour of parabolic notch hinges submitted to the classical sollicitations of a beam is studied. For each sollicitation, an analytical solution is given first. Its asymptotic expression for ... [more ▼]

The elastic behaviour of parabolic notch hinges submitted to the classical sollicitations of a beam is studied. For each sollicitation, an analytical solution is given first. Its asymptotic expression for very narrow hinges is then obtained and finally,, an approximate factor relating the exact solution to the asymptotic one is proposed. [less ▲]

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See detailA comparison of piston, screw and scroll expanders for small scale Rankine cycle systems
Lemort, Vincent ULg; Guillaume, Ludovic ULg; Legros, Arnaud ULg et al

in Proceedings of the 3rd International Conference on Microgeneration and Related Technologies (2013, April)

This paper aims at helping the designer of micro-scale Rankine Cycle heat engines to best select the expander among piston, screw and scroll machines. The first part of the paper presents a state of the ... [more ▼]

This paper aims at helping the designer of micro-scale Rankine Cycle heat engines to best select the expander among piston, screw and scroll machines. The first part of the paper presents a state of the art of these three technologies of positive displacement machines. The technical constraints inherent to each machine (rotational speed, pressure ratios, maximum temperatures, volumetric expansion ratios, etc.) are listed and the performance mentioned in the open technical and scientific literature is presented. The second part of the paper deals with the modeling of such expanders. Different simulation models are proposed: black-box, grey-box and white-box models. These three categories of modeling are specifically adapted to different purposes: design of the expander, design of the micro-CHP system, and dynamic simulation/control of the CHP unit. The last part of the paper presents a graphical methodology of selection of expansion machines and working fluids based on operating maps. It is stressed that the selections of both the expansion machine and working fluid should be conducted simultaneously. [less ▲]

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See detailComparative study of four safflower oils (Carthamus tinctorius) varieties grown in eastern of Morocco
Ben Moumen, A.; Mansouri, F.; Zraibi, L. et al

in Book of Proceedings InsideFood Symposium (2013, April)

In this study, four safflower varieties, originating from Spain (Rancho), India (Sharda) and Morocco (Cartamar and Cartafri) cultivated at the experimental station of OUJDA (semi-arid region of Eastern ... [more ▼]

In this study, four safflower varieties, originating from Spain (Rancho), India (Sharda) and Morocco (Cartamar and Cartafri) cultivated at the experimental station of OUJDA (semi-arid region of Eastern Morocco) were evaluated for their oil yield and seed oil quality. The analysis of results revealed significant differences among varieties for all traits. Indeed, our result show that seeds of the four varieties have important oil content ranged between 35.38% (Rancho) and 28.84% (Cartamar). Characterization of these oils showed a low value of acidity index less than 0.7% for all the varieties but significant differences in their peroxide values ranged between 4.5 meq O2/Kg (Cartamar) and 31.21 mEqO2/Kg (Rancho) and high value of phenolic content between 143 ppm (Rancho) and 97 ppm (Sharda). Analysis of the fatty acids shows that linoleic acid is the main fatty acid ranged between 77.94% (Cartamar) and 79.98% (Sharda). Oils of those four varieties can be classified in the linoleic acid group. The analysis of triglycerides by HPLC shows 10 molecular species of TAG (LLL, LPL, LLO, PLO, LLS, POP, OOO, POO, SOO, PPL). The trilinoleate (LLL) is the main molecular species with more than 50%. Safflower seed oil cultivated in eastern Morocco presents good physicochemical proprieties (polyphenols and Omega 6 richness); therefore, safflower culture could be suggested for all areas of Morocco, including the areas of low pluviometry, while the potential for culture of other oilseeds is more limited. [less ▲]

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See detailModélisation régionale et locale sur base des données de la carte géologique
Orban, Philippe ULg

in Renard, José (Ed.) La carte hydrogéologique de Wallonie : un outil au service de tous - Synthèse des exposés (2013, April)

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See detailLes équations allométriques pan-tropicales plurispécifiques sont-elles valables en Afrique centrale ?
Fayolle, Adeline ULg; Doucet, Jean-Louis ULg; Gillet, Jean-François ULg et al

in Picard, Nicolas; Henry, Mathieu (Eds.) Compte-rendu de l'Atelier scientifique régional sur les équations allométriques en Afrique Centrale : PREREDD, Yaoundé 2-5 avril 2013 (2013, April)

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See detailNonparametric subspace identification of nonlinear structures - Application to a spacecraft
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (2013, April)

The objective of the present paper is to address the identification of a strongly nonlinear satellite structure by exploiting a new nonlinear subspace identification method formulated in the frequency ... [more ▼]

The objective of the present paper is to address the identification of a strongly nonlinear satellite structure by exploiting a new nonlinear subspace identification method formulated in the frequency domain, referred to as the FNSI method. The modal parameters of the underlying linear structure and the coefficients of the nonlinear internal forces will be estimated by this approach. Moreover, because a priori knowledge about nonlinear behaviour may be limited, the paper also proposes a nonparametric spline-based modelling strategy, encapsulated in the FNSI method. The application of interest is the SmallSat spacecraft developed by EADS-Astrium, which possesses an impact-type nonlinear device consisting of eight mechanical stops limiting the motion of an inertia wheel mounted on an elastomeric interface. [less ▲]

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See detailL’indice paysager Caulerpa racemosa “I.Ca.r”
Cariou, Nicolas; Chery, Aurélia; Jousseaume, Matthieu et al

in Ifremer (Ed.) CARtographie des HAbitats Marins Benthiques : de l'Acquisition à la Restitution (2013, March 27)

Depuis 2002, l’algue invasive Caulerpa racemosa var. cylindracea a été signalée au niveau de la Corse. Elle apparaît pour la première fois, en 2008, au niveau de la baie de Calvi (Corse). Depuis cette ... [more ▼]

Depuis 2002, l’algue invasive Caulerpa racemosa var. cylindracea a été signalée au niveau de la Corse. Elle apparaît pour la première fois, en 2008, au niveau de la baie de Calvi (Corse). Depuis cette époque, le nombre et la surface des sites envahis augmentent. L'analyse fine de l'évolution spatio-temporelle de sa distribution dans la zone prospectée confirme que C. racemosa colonise d'abord les sites profonds. A partir des différents stades de colonisation, un indice paysager (Indice Caulerpa racemosa: "I.Ca.r") adapté à la plongée en scaphandre autonome a été élaboré. "I.Ca.r" qui tient compte de l'expérience du plongeur, du type de substrat et de la superficie colonisée est un code à 8 caractères. Il permet une comparaison spatiale de sites colonisés et également une analyse de l'évolution temporelle de la colonisation. Mis au point en Baie de Calvi, l'indice paysager "I.Ca.r" peut être appliqué sur la Corse et sur l'ensemble de La Méditerranée. La méthodologie simple, résumée sur une fiche pourrait être distribuée dans les clubs de plongée et les informations envoyées au réseau Caulerpe par exemple. [less ▲]

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See detailDynamiques complexes de rebonds d'une goutte placée sur un bain vibré: résonances et anti-résonances
Hubert, Maxime ULg; Vandewalle, Nicolas ULg

in Hubert, Maxime; Vandewalle, Nicolas (Eds.) Comptes-rendus de la 16e Rencontre du Non-linéaire Paris 2013 (2013, March 25)

We present herebelow a model for bouncing droplets consisting of two masses joined by a spring and a damper bouncing onto an oscillating plate. We analyze the dynamics through the bouncing threshold and ... [more ▼]

We present herebelow a model for bouncing droplets consisting of two masses joined by a spring and a damper bouncing onto an oscillating plate. We analyze the dynamics through the bouncing threshold and spatio-temporal diagrams. We obtain an analytic expression for the threshold. Resonance and Anti-resonance phenomena are found and investigated. The behavior of the bouncing spring is compared to the bouncing droplet dynamics. In particular, key features of the bouncing droplet dynamics are reproduced. [less ▲]

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See detailMyeloperoxidase activity decreases in equine semen freezing extenders
Ponthier, Jérôme ULg; Franck, Thierry ULg; Niesten, Ariane ULg et al

in Amir, Arav (Ed.) Proceedings of the 3rd Cryo Congress (2013, March 23)

Myeloperoxidase (MPO) is a pro-oxidant enzyme contained in and released by neutrophils, and associated with decreased post-thaw motility of equine semen. This study aimed to compare MPO activity in pure ... [more ▼]

Myeloperoxidase (MPO) is a pro-oxidant enzyme contained in and released by neutrophils, and associated with decreased post-thaw motility of equine semen. This study aimed to compare MPO activity in pure equine freezing extender, raw and post-thaw semen. Active MPO Concentration (AMC) was measured with Specific Immunologic Extraction Followed by Enzymatic Detection in 20 ejaculates. Raw semen intra cellular AMC was determined in the supernatant after membrane lysis, each pellet containing 100x106 spermatozoa. AMC was also assayed in supernatants of semen frozen following a conventional method using INRA FreezeTM (IMV, France). Effect of freezing procedure on AMC was tested by experimentally adding 500ng of purified active MPO (Calbiochem, Germany) in 4 samples either with 5ml of PBS or INRA FreezeTM before assay. AMC was higher in sperm-rich pellet (0.306ng/ml) than in post-thaw semen (0.002ng/ml) (p=0.058). After experimental MPO addition, no activity variation was observed during the freezing procedure (after dilution, 1, 2 hours of cooling and post-thawing) within the same medium. Purified MPO activity was decreased in INRA FreezeTM when compared to PBS at all timings of sampling (p=0.0286). When all samples were pooled, remaining activity in INRA FreezeTM was 23.93±13.13%. MPO fixation on large proteins contained in the extender experimentally reduces AMC, as previously observed in plasma. However, AMC decrease observed during semen freezing is more important than after experimental addition. That could be explained by a MPO interaction with seminal plasma, a partial MPO release or a MPO inactivation during equine semen freezing. [less ▲]

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See detailHow to use Diigo for allowing the students from large classes to become active ?
Colaux, Catherine ULg

in 7th International Technology, Education and Development Conference Valencia, Spain. 4-5 March, 2013. (2013, March 04)

Teaching in the early bachelor’s degrees at the university often comes down to classical ex cathedra courses for which the students take a passive role leading progressively to the lost of their ... [more ▼]

Teaching in the early bachelor’s degrees at the university often comes down to classical ex cathedra courses for which the students take a passive role leading progressively to the lost of their motivation which may result in school failure. In this work, we demonstrate that the use of a collaborative social bookmarking, such as Diigo, can help for preserving and promoting the student motivation within large classes. Diigo is a free online tool used in a bachelor class of Bio Engineering (270 students) at the Gembloux Agro Bio Tech Faculty (University of Liege, Belgium) in order to allow students to work actively in small groups of 6 students. During this activity, which is supervised by a tutor who is also a teacher, the students prepare themselves the subject of the course. The impacts of this learning activity are clear: the motivation is substantially increased and the teacher can assist each group in its research through the Network rather than merely transmit his knowledge to a large audience without close interactions with the students. bookmarking, such as Diigo, can help for preserving and promoting the student motivation within large classes. Diigo is a free online tool used in a bachelor class of Bio Engineering (270 students) at the Gembloux Agro Bio Tech Faculty (University of Liege, Belgium) in order to allow students to work actively in small groups of 6 students. During this activity, which is supervised by a tutor who is also a teacher, the students prepare themselves the subject of the course. The impacts of this learning activity are clear: the motivation is substantially increased and the teacher can assist each group in its research through the Network rather than merely transmit his knowledge to a large audience without close interactions with the students. [less ▲]

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See detailAn abundance study of the red giants in the seismology fields of the CoRoT satellite
Morel, Thierry ULg; Miglio, A.; Lagarde, N. et al

in European Physical Journal Web of Conferences (2013, March 01)

A precise characterisation of the red giants in the seismology fields of the CoRoT satellite is a prerequisite for further in-depth seismic modelling. The optical spectra obtained for 19 targets have been ... [more ▼]

A precise characterisation of the red giants in the seismology fields of the CoRoT satellite is a prerequisite for further in-depth seismic modelling. The optical spectra obtained for 19 targets have been used to accurately estimate their fundamental parameters and chemical composition. The extent of internal mixing is also investigated through the abundances of Li, CNO and Na (as well as [SUP]12[/SUP]C/[SUP]13[/SUP]C in a few cases). [less ▲]

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See detailDifferential population studies using asteroseismology: Solar-like oscillating giants in CoRoT fields LRc01 and LRa01
Miglio, A.; Chiappini, C.; Morel, Thierry ULg et al

in European Physical Journal Web of Conferences (2013, March 01)

Solar-like oscillating giants observed by the space-borne satellites CoRoT and Kepler can be used as key tracers of stellar populations in the Milky Way. When combined with additional photometric ... [more ▼]

Solar-like oscillating giants observed by the space-borne satellites CoRoT and Kepler can be used as key tracers of stellar populations in the Milky Way. When combined with additional photometric/spectroscopic constraints, the pulsation spectra of solar-like oscillating giant stars not only reveal their radii, and hence distances, but also provide well-constrained estimates of their masses, which can be used as proxies for the ages of these evolved stars. In this contribution we provide supplementary material to the comparison we presented in Miglio et al. (2013) between populations of giants observed by CoRoT in the fields designated LRc01 and LRa01. [less ▲]

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See detailImpact of climate change on inundation hazard along the river Meuse
Dewals, Benjamin ULg; Drogue, Gilles; Erpicum, Sébastien ULg et al

in Transboundary Water Management in a Changing Climate (2013, March)

As a part of the effort to scientifically inform the development of the adaptation strategy for the Meuse basin, we detail hereafter the generation of integrated climate and hydrological scenarios for the ... [more ▼]

As a part of the effort to scientifically inform the development of the adaptation strategy for the Meuse basin, we detail hereafter the generation of integrated climate and hydrological scenarios for the whole basin. We also present the setup of a first coordinated hydraulic modelling from spring to mouth of the river Meuse. The latter has enabled to compute the range of change in inundation hazard under the “wet” transnational hydrological scenario for the time slices 2021-2050 and 2071-2100. A significantly higher impact of climate change has been found in the middle part of the Meuse basin, compared to the upper and the lower parts. These conclusions have been further confirmed by a refined analysis conducted for a 100 km-long stretch of the river Meuse crossing the Belgian-Dutch border. [less ▲]

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See detailThe development and validation of nursing related groups based on the Belgian Nursing Minimum Dataset
THONON, Olivier ULg; VAN HERCK, Pieter; GILLAIN, Daniel ULg et al

in SHEERIN, Fintan; SERMEUS, Walter; EHRENBERG, Anna (Eds.) ACENDIO 2013 - Proceedings of 9th European Conference of ACENDIO (2013, March)

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See detailMulti-method monitoring of odor emissions in agricultural biogas facilities.
Nicolas, Jacques ULg; Adam, Gilles ULg; Ubeda, Yolanda et al

in Proceedings of the 5th IWA conference on odours and air emissions, San Francisco, USA, March, 4-7, 2013 (2013, March)

The production of farm-based biogas and electricity is an area of alternative-energy interest to many livestock producers. However, it is still insignificant in comparison to the maximum potential of ... [more ▼]

The production of farm-based biogas and electricity is an area of alternative-energy interest to many livestock producers. However, it is still insignificant in comparison to the maximum potential of farms all over the world. Market penetration should involve better confidence in the technique and better understanding of its possible assets and limits. For instance, is the environmental impact of biomethanation positive or negative? What are the possible ways to avoid or to control process imbalances? In the context of a European project, the research group attempted to tackle those questions under the angle of gas emission and more particularly of odor annoyance. A multi-method approach was applied to monitor biogas and odor emissions, both at the laboratory level on pilot plants and at real scale in 4 agricultural biogas facilities, in Belgium, Luxembourg, France and Germany. Results show that digested material is generally less odorant than crude manure or slurry, while preserving all the amendment and fertilizing qualities of the original material. Possible annoyance of agricultural biogas facilities in the surroundings remains limited and can be solved through simple techniques. [less ▲]

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See detailA Verification-Based Approach to Memory Fence Insertion in PSO Memory Systems
Linden, Alexander ULg; Wolper, Pierre ULg

in Proceedings of the 19th international conference on Tools and algorithms for the construction and analysis of systems (2013, March)

This paper addresses the problem of verifying and correcting programs when they are moved from a sequential consistency execution environment to a relaxed memory context. Specifically, it considers the ... [more ▼]

This paper addresses the problem of verifying and correcting programs when they are moved from a sequential consistency execution environment to a relaxed memory context. Specifically, it considers the PSO (Partial Store Order) memory model, which corresponds to the use of a store buffer for each shared variable and each process. We also will consider, as an intermediate step, the TSO (Total Store Order) memory model, which corresponds to the use of one store buffer per process. The proposed approach extends a previously developed verification tool that uses finite automata to symbolically represent the possible contents of the store buffers. Its starting point is a program that is correct for the usual Sequential Consistency (SC) memory model, but that might be incorrect under PSO with respect to safety properties. This program is then first analyzed and corrected for the TSO memory model, and then this TSO-safe program is analyzed and corrected under PSO, producing a PSO-safe program. To obtain a TSO-safe program, only store-load fences (TSO only allows store-load relaxations) are introduced into the program. Finaly, to produce a PSO-safe program, only store-store fences (PSO additionally allows store-store relaxations) are introduced. An advantage of our technique is that the underlying symbolic verification tool makes a full exploration of program behaviors possible even for cyclic programs, which makes our approach broadly applicable. The method has been tested with an experimental implementation and can effectively handle a series of classical examples. [less ▲]

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See detailDevelopment of advanced models for transition to turbulence in hypersonic flows and prediction of transition under uncertainties
Serino, Gennaro ULg; Terrapon, Vincent ULg; Magin, Thierry et al

in Serino, Gennaro (Ed.) Review of the VKI Doctoral Research 2012-2013 (2013, March)

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See detail2. Implantation des cultures
Eylenbosch, Damien ULg; Pierreux, Jérome ULg; Dufranne, Delphine et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail3. Contrôle des populations de mauvaises herbes
Jaunard, Delphine ULg; Monty, Arnaud ULg; Mahy, Grégory ULg et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail4. La fumure azotée
Meza Morales, Walter; Monfort, Bruno; Dumont, Benjamin ULg et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail5. Les régulateurs de croissance
Meza Morales, Walter; Seutin, Benoît ULg; Monfort, Bruno et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail11. Perspectives - 2. La culture en association de froment et de pois: une opportunité pour réduire l'abondance des pucerons en été
Lopes, T.; Bodson, Bernard ULg; Francis, Frédéric ULg

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail6. Lutte intégrée contre les maladies
Duvivier, Maxime; Mahieu, Olivier; Heens, B. et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail10. Environnement et gaz à effet de serre
Moureaux, Christine ULg; Aubinet, Marc ULg; Bodson, Bernard ULg

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detailObject-Based Approach and Tree-Based Ensemble Classifications for Mapping Building Changes
El Mansouri, Loubna ULg

in GEOProcessing 2013, The Fifth International Conference on Advanced Geographic Information Systems, Applications, and Ser vices (2013, February 24)

The aim of this paper is to efficiently detect and identify the building changes from newly registered very high spatial resolution (VHSR) image by comparing with outdated map. The whole process is ... [more ▼]

The aim of this paper is to efficiently detect and identify the building changes from newly registered very high spatial resolution (VHSR) image by comparing with outdated map. The whole process is performed mainly on four steps. First, the image was segmented to generate primitives, which are then represented by a feature vector composed from spectral, geometric, textural and contextual attributes. Thereafter, tree-based ensemble methods (Bagging, Random Forest and Extremely Randomized Trees) are used in a classification step. The final objects' prediction is deducted thanks to better classifier error rate. Last, a post classification change detection step allows to identify the segments which represent building changes. The data used in this research concerns the city of Rabat (Morocco). A Quickbird image has been used with an old map at the scale of 1:10,000. Regardless of the quality of the detected buildings' shape, the method achieves good rates of completeness (94%) and correctness (92%). [less ▲]

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See detailEffects of 3 months of controlled whole body vibrations with low exposure period on the risk of falls among nursing home residents
Beaudart, Charlotte ULg; Maquet, Didier ULg; Mannarino, Mélanie et al

in Proceeding of the meeting (2013, February 22)

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See detailFunctional screening of a metagenomic library from algal biofilms
Martin, Marjolaine ULg; Barbeyron, Tristan; Michel, Gurvan et al

in Smagghe, Guy; Boeckx, Pascal; Bossier, Peter (Eds.) et al Communications in Agricultural and Applied Biological Sciences (2013, February 08)

Macroalgae, and particularly their lignin-free polysaccharides, are increasingly used for their gelling and therapeutic properties and for the production of biofuels and renewable chemical compounds. To ... [more ▼]

Macroalgae, and particularly their lignin-free polysaccharides, are increasingly used for their gelling and therapeutic properties and for the production of biofuels and renewable chemical compounds. To extract, hydrolyze and purify this biomass, algae hydrolyzing enzymes are needed. Our work aims to identify and characterize algal biomass hydrolyzing enzymes expressed by microorganisms living on the surface of algae, by functional metagenomics. Therefore, a microbial DNA extraction method was developed to isolate the gDNA from the microorganisms of the brown algae Ascophyllum nodosum and a metagenomic library was constructed in Escherichia coli. The library was screened for diverse enzymatic activities (esterases, xylanases, cellulases, α-amylases, arabinanases, caseinases and β-glucosidases) on agar plates with specific enzymes substrates. Several new microbial enzymes (esterases, β-glucosidases, α-amylases and cellulases) were identified revealing the wealth of our library. Furthermore, those enzymes had less than 50% sequence identity with known protein sequences; meaning that our approach allows to identify new microbial enzymes expressed by uncultured microorganisms. Plate tests for medium-throughput screening of specific enzymes hydrolyzing algal polysaccharides (agarases, carrageenases and alginate lyases) are currently being developed. Our approach will probably allow us to identify new families of those ill-known enzymes, with particular enzymatic activities. [less ▲]

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See detailX-ray emission of interacting wind binaries in Cyg OB2
Nazé, Yaël ULg; Cazorla, Constantin ULg; Rauw, Grégor ULg

in EAS Publications Series (2013, February 01)

Cyg OB2 #5, #8A, and #9 are binary or multiple massive stars in the Cyg OB2 association displaying several peculiarities, such as bright X-ray emission and non-thermal radio emission. Our X-ray monitoring ... [more ▼]

Cyg OB2 #5, #8A, and #9 are binary or multiple massive stars in the Cyg OB2 association displaying several peculiarities, such as bright X-ray emission and non-thermal radio emission. Our X-ray monitoring of these stars reveals the details of their behaviours at high energies, which can be directly linked to wind-wind collisions (WWCs). In addition, the X-ray emission of Cyg OB2 #12, an evolved massive star, shows a long-term decrease, which could hint at the presence of a companion (with associated colliding winds) or indicate the return to quiescence of the star following a recent eruption. [less ▲]

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See detailInteracting winds in massive binaries
Rauw, Grégor ULg

in Pavlovski, Kresimir; Tkachenko, Andrew; Torres, Guillermo (Eds.) EAS Publications Series (2013, February 01)

Massive stars feature highly energetic stellar winds that interact whenever two such stars are bound in a binary system. The signatures of these interactions are nowadays found over a wide range of ... [more ▼]

Massive stars feature highly energetic stellar winds that interact whenever two such stars are bound in a binary system. The signatures of these interactions are nowadays found over a wide range of wavelengths, including the radio domain, the optical band, as well as X-rays and even γ-rays. A proper understanding of these effects is thus important to derive the fundamental parameters of the components of massive binaries from spectroscopic and photometric observations. [less ▲]

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

in 8th International Neonatal Conference (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 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 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 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 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 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 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 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 detailNutritional requirements for premature infants
SENTERRE, Thibault ULg

in 8th International Neonatal Conference (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 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 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 detailGrowth, development and metabolic programming in premature infants
SENTERRE, Thibault ULg

in 8th International Neonatal Conference (2013, February)

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

in Abstract book of the NCCR Annual Research Forum (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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 detailA nap to recap: Reward strengthens relational memory during daytime sleep
Igloi, Kinga; Gaggioni, Giulia Alice ULg; Eryilmaz, Hamdi et al

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

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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 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 detailQuelques considérations sur la préservation de l'authenticité des quartiers résidentiels modernes du nord de Bucarest
Dawans, Stéphane ULg; Houbart, Claudine ULg

in Crisan, Rodica (Ed.) Conservation / Regeneration. The modernist neighborhood (2013)

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See detailPerceptual andMotor Inhibition in ADHD:Evidence for a specific impairment?
Catale, Corinne ULg; Geurten, Marie ULg; Lejeune et al

in Abstracts book (2013)

Objective: Inhibition, one of the core executive processes in executive functioning (Miyake et al., 2000) is generally not considered as an unitary construct (see for example, Friedman & Miyake, 2004 ... [more ▼]

Objective: Inhibition, one of the core executive processes in executive functioning (Miyake et al., 2000) is generally not considered as an unitary construct (see for example, Friedman & Miyake, 2004; Nassauer & Halperin, 2003). Following the perceptual versus motor dissociation proposed by Nassauer and Halperin (2003), we studied perceptual and motor inhibition in children with AttentionDeficit andHyperactivity Disorder (ADHD). Participants and Methods: Sixteen 7-12 years old children with ADHD and 30 matched control children were administered a version of the Conflict Resolution task (Nassauer & Halperin, 2003) adapted for children. In this task, the perceptual inhibition task required the children to respond to the direction of a dog (running towards the left or the right) while ignoring its location (left or right) on a computer screen. In the motor inhibition task, the children had to press a key corresponding to the opposite direction of a centrally running dog. Results: Comparisons analyses of inhibition performances between ADHD children and matched controlled subjects showed that ADHD children performed significantly less accurately for stimulus-stimulus characteristic conflicts (i.e., perceptual inhibition) than for stimulus- response conflicts (i.e., motor inhibition), which suggests a specific impairment in perceptual inhibition in our group of ADHD children. Conclusions: In conclusion, this study supports the presence of two forms of inhibition which can be differentiated and specifically impaired in 7- to 12-year-old ADHD children. [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 detailL'avènement des Hommes modernes en Belgique
Otte, Marcel ULg; Noiret, Pierre ULg

in Bodu, Pierre; Chehmana, Lucie; Klaric, Laurent (Eds.) et al Le Paléolithique supérieur ancien de l'Europe du Nord-Ouest (2013)

In Belgium, Palaeolithic research goes back to the early 19th century, in the wake of mining and quarry work. Geology and paleontology developed early and rapidly and were economically important. As a ... [more ▼]

In Belgium, Palaeolithic research goes back to the early 19th century, in the wake of mining and quarry work. Geology and paleontology developed early and rapidly and were economically important. As a result, the earliest human history was reconstructed here entirely independently, by defining the Mousterian (Engis, 1830), Aurignacian (Montaigle), Gravettian (Trou Magrite) and Magdalenian (Chaleux) periods. Belgium, due to its central position, is in addition particularly representative of the wave of "modernity" that suddenly was adopted across northwest Europe, overlying a highly diverse and innovative cultural base during the time of the Neandertals. At this point in time, as in others, Belgium played the role of intermediary and incubator between the British Isles and the Rhineland, extending as far as the Loire. [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 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 detailOn differential passivity of physical systems
Forni, Fulvio ULg; Sepulchre, Rodolphe ULg; van der Schaft, Arjan

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

Differential passivity is a property that allows to check with a pointwise criterion that a system is incrementally passive, a property that is relevant to study interconnected systems in the context of ... [more ▼]

Differential passivity is a property that allows to check with a pointwise criterion that a system is incrementally passive, a property that is relevant to study interconnected systems in the context of regulation, synchronization, and estimation. The paper investigates how restrictive is the property, focusing on a class of open gradient systems encountered in the coenergy modeling framework of physical systems, in particular the Brayton-Moser formalism for nonlinear electrical circuits. [less ▲]

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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 detailLes besoins sociaux et économiques de la collectivité dans le droit de l’aménagement du territoire et de l’urbanisme
Pâques, Michel ULg; Donnay, Luc ULg; Vercheval, Cécile ULg

in Delnoy, Michel; Born, Charles-Hubert; Van Damme, Nathalie (Eds.) Le droit de l’aménagement du territoire et de l’urbanisme, 50 ans après la loi organique (2013)

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See detailOrganic Rankine Cycle Systems: A Techno-Economic Overview
van den Broeck, Martijn; Quoilin, Sylvain ULg; Declaye, Sébastien ULg et al

in Proceedings of EMC 2013 (2013)

The potential of organic Rankine cycle (ORC) technology for waste heat recovery in industry is discussed. This survey includes a market overview, a discussion of the key differences with steam turbine ... [more ▼]

The potential of organic Rankine cycle (ORC) technology for waste heat recovery in industry is discussed. This survey includes a market overview, a discussion of the key differences with steam turbine technology, some main selection issues (components and working fluid) and an outlook on the future of the technology. [less ▲]

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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 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 detailCitations et usages de l'art du Moyen Empire à l'époque thoutmoside
Laboury, Dimitri ULg

in Bickel, Susanne (Ed.) Vergangenheit und Zukunft. Studien zum historischen Bewusstsein in der Thutmosidenzeit (2013)

The article aims at characterizing forms and functions of the uses of Middle Kingdom art in royal and court productions during the Thutmosid Period. In order to assess this artistic phenomenon as a ... [more ▼]

The article aims at characterizing forms and functions of the uses of Middle Kingdom art in royal and court productions during the Thutmosid Period. In order to assess this artistic phenomenon as a conscious revival and not just a survival of the Past and of the tradition, the analysis starts with a brief examination of the disruption that was felt and expressed during the Second Intermediate Period. It then goes on investigating the evolution of the references to Middle Kingdom art from the dawn of the 18th Dynasty to the time of Hatshepsut and Thutmosis III, when some sorts of artistic quotations replaced a global renaissance of Middle Kingdom forms of expression. A special attention is paid to the relationship between creativity and archaism under the reign of Hatshepsut, and leads to conclude the article with some theoretical deductions on the study of Ancient Egyptian archaism and a tentative definition of how innovation was conceptualized in Ancient Egyptian culture. [less ▲]

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See detailMagnetic fields in O stars
Nazé, Yaël ULg

in proceedings of "Putting A-stars into context" (2013)

Over the last decade, large-scale, organized (generally dipolar) magnetic fields with a strength between 0.1 and 20 kG were detected in dozens of OB stars. This contribution reviews the impact of such ... [more ▼]

Over the last decade, large-scale, organized (generally dipolar) magnetic fields with a strength between 0.1 and 20 kG were detected in dozens of OB stars. This contribution reviews the impact of such magnetic fields on the stellar winds of O-stars, with emphasis on variability and X-ray emission. [less ▲]

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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 detailLectio bilingue, bilinguismo della lectio sull’accentazione grafica nei papiri latini: sondaggi dai PNess. II 1 e 2
Scappaticcio, Maria Chiara ULg

in Bilinguisme et digraphisme dans le monde gréco-romain: l’apport des papyrus latins (2013)

Detailed reference viewed: 25 (4 ULg)