References of "Scientific congresses and symposiums"
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See detailSolving the gas transmission problem with consideration of the compressors
Bakhouya, Bouchra; de Wolf, Daniel ULg

Conference (2008, February 25)

In [7], De Wolf and Smeers consider the problem of the gas distribution through a network of pipelines. The problem was formulated as a cost minimization subject to nonlinear flow-pressure relations ... [more ▼]

In [7], De Wolf and Smeers consider the problem of the gas distribution through a network of pipelines. The problem was formulated as a cost minimization subject to nonlinear flow-pressure relations, material balances and pressure bounds. This model does not reflect any more the current situation on the gas market. Today, the transportation and gas buying functions are separated. This work considers the new situation for the transportation company. The objective for the transportation company is to determine the flows in the network that minimize the energy used for the gas transport. This corresponds to the minimization of the power used in the compressors. [less ▲]

Detailed reference viewed: 91 (3 ULg)
See detailProtection cardiovasculaire et rénale chez le patient diabétique
Krzesinski, Jean-Marie ULg

Conference (2008, February 23)

Detailed reference viewed: 14 (11 ULg)
See detailProtection cardiovasculaire et rénale chez le patient diabétique
Krzesinski, Jean-Marie ULg

Conference (2008, February 23)

Detailed reference viewed: 12 (8 ULg)
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See detailUn usage du logiciel Nvivo : Expérience et illustration au travers de l'élaboration d'un argument
Melard, François ULg

Conference (2008, February 22)

Présentation de l'usage du logiciel Nvivo (analyse qualitative de données non-structurées) au travers de la construction progressive d'un argument socio-technique (selon l'approche dite de la sociologie ... [more ▼]

Présentation de l'usage du logiciel Nvivo (analyse qualitative de données non-structurées) au travers de la construction progressive d'un argument socio-technique (selon l'approche dite de la sociologie de la traduction - ANT). [less ▲]

Detailed reference viewed: 101 (12 ULg)
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See detailQuelques difficultés de l’empiriocriticisme
Dewalque, Arnaud ULg

Conference (2008, February 22)

L’idée centrale de Mach et d’Avenarius est que tous les concepts métaphysiques qui ne trouvent pas leur source directe dans l’expérience (et d’abord les deux grandes catégories traditionnelles de cause et ... [more ▼]

L’idée centrale de Mach et d’Avenarius est que tous les concepts métaphysiques qui ne trouvent pas leur source directe dans l’expérience (et d’abord les deux grandes catégories traditionnelles de cause et de substance) ne sont que des fictions qui répondent à des besoins pratiques et qui doivent être « éliminées » au moyen d’une description des faits empiriques et des relations de « dépendance » dans lesquelles ils se trouvent. Bien qu’insatisfaisante à bien des égards, la position empiriocritique recèle néanmoins, comme le remarque Moritz Schlick, des « contradictions instructives » . Ce sont ces contradictions ou ses difficultés que je tâcherai de faire apparaître. Je commencerai par donner un bref aperçu des deux versants du programme d’Avenarius, que j’appellerai respectivement – à la suite de Wundt – la théorie de l’expérience pure (1°) et la théorie de l’introjection (2°). Ensuite, j’examinerai trois critiques qui ont été adressées à la méthode empiriocriticiste par Wundt, Rickert et Schlick. Ces critiques concernent trois problèmes qui ont été très débattus au tournant du vingtième siècle en raison de la prédominance des courants positivistes : le problème de la description (3°), le problème du sujet connaissant (4°) et le problème de l’immanence (5°). [less ▲]

Detailed reference viewed: 36 (1 ULg)
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See detailDiagnostic des infections sexuellement transmissibles.
HUYNEN, Pascale ULg

Conference (2008, February 21)

Detailed reference viewed: 10 (0 ULg)
See detailBen Okri's Starbook: A Magical Pathway to Reality, or an Enchanted Road to Nowhere?
Tunca, Daria ULg

Conference (2008, February 21)

Detailed reference viewed: 34 (3 ULg)
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See detailQualité froment: L'amidon de blé, une matière première agricole aux caractéristiques et propriétés diverses mais maîtrisables
Bodson, Bernard ULg; Massaux, Carine; Paridaens, A. M. et al

in Livre Blanc: Céréales - Gembloux (2008, February 20)

Detailed reference viewed: 36 (0 ULg)
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See detailImplantation des cultures
Bodson, Bernard ULg; Roisin, Christian; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux (2008, February 20)

Detailed reference viewed: 3 (0 ULg)
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See detailLutte contre les maladies: les résultats des essais "protection fongicide" réalisés sur escourgeon sur le site de Lonzée en 2007
Monfort, Bruno; Bodson, Bernard ULg

in Livre Blanc: Céréales - Gembloux (2008, February 20)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailLe système éducatif de la Communauté française de Belgique
Baye, Ariane ULg

Conference (2008, February 19)

Detailed reference viewed: 7 (1 ULg)
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See detailPaclitaxel-loaded PEGylated nanocarriers: Preparation, physicochemical characterization and in vitro anti-tumoral activity
Danhier, F.; Lecouturier, N.; Vroman, Benoit et al

in Acta Clinica Belgica (2008, February 16), 63(2), 124

Detailed reference viewed: 13 (4 ULg)
See detailAlimentation pendant la première année de vie
Senterre, Thibault ULg

Conference (2008, February 16)

Detailed reference viewed: 34 (4 ULg)
See detailIntérêt des analyses d'urines en médecine interne
Krzesinski, Jean-Marie ULg

Conference (2008, February 16)

Detailed reference viewed: 1 (0 ULg)
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See detailOptimization of the Production of the Amyloidogenic Variants of Human Lysozyme
Menzer, Linda ULg; Tocquin, Pierre ULg; Dony, Nicolas et al

Poster (2008, February 16)

Detailed reference viewed: 24 (3 ULg)
See detailIR and UV spectroscopy of DNA ions stored in a quadrupole ion trap mass spectrometer
Gabelica, Valérie ULg; Rosu, Frédéric ULg; Gregoire, Gilles et al

Conference (2008, February 15)

Electrospray mass spectrometry (ESI-MS) can be used to transfer large biomolecular complexes from the solution to the gas phase. However, a longstanding question is whether the gas-phase multiply-charged ... [more ▼]

Electrospray mass spectrometry (ESI-MS) can be used to transfer large biomolecular complexes from the solution to the gas phase. However, a longstanding question is whether the gas-phase multiply-charged ions produced by ESI-MS keep a folded conformation in the absence of solvent. Nucleic acid secondary structures are determined by hydrogen bonding interactions between nucleic bases and by stacking interactions between neighboring base pairs. In solution, infrared (IR) and ultraviolet (UV) spectroscopies provide information on hydrogen bonding and stacking interactions in nucleic acids, respectively. Here we will show how IR and UV spectra of gas-phase ions can be recorded, and what can be learned on the structure of nucleic acids (double helices and quadruple helices) in the gas phase. The IR spectroscopy experiments on DNA negative ions were carried out at the CLIO free electron laser (FEL) center using an electrospray quadrupole ion trap mass spectrometer (Esquire 3000, Bruker Daltonics, Germany) modified to inject the IR beam in the trap through the ring electrode. IRMPD spectra are recorded by monitoring the relative fragmentation efficiency of mass-selected parent ions as a function of the excitation wavenumber, in the range 1000-2000 cm-1. Data interpretation on these large biomolecule ions is made using carefully chosen control experiments. The major finding is a fingerprint of hydrogen bonding in the gas phase in the guanine C6=O6 stretching mode, that allows probing the conservation of G-quartets in the gas phase. The experiments demonstrate the conservation of G-quadruplex hydrogen bonds in the human telomeric sequence d(TTAGGG)4. The UV spectroscopy experiments were carried out using a tunable OPO laser (Continuum Lasers, Santa Clara, CA, USA) with frequency doubling. The laser is interfaced with a Finnigan LCQ ESI-QIT mass spectrometer. The UV action spectra were recorded by monitoring electron detachment from DNA multiply charged anions as a function of the wavelength between 220 and 300 nm. Preliminary results suggest that stacking interactions are preserved in duplexes containing GC base pairs, and in G-quadruplexes containing inner cations. [less ▲]

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See detailValeur et signification chez Saussure. Quelques problèmes interprétatifs. Vers une question ontologique
Sofia, Estanislao ULg

Conference (2008, February 14)

On part de l’analyse des notes prises par Emile Constantin lors du troisième cours de linguistique générale donné par Saussure en 1910-1911. On s’intéresse aux concepts de « valeur » et de « signification ... [more ▼]

On part de l’analyse des notes prises par Emile Constantin lors du troisième cours de linguistique générale donné par Saussure en 1910-1911. On s’intéresse aux concepts de « valeur » et de « signification ». On constate que l’on trouve, pour chacun de ces termes, même si l’on se borne à une période relativement courte de l’enseignement saussurien (12 mai - 4 juillet 1911), des valeurs théoriques assez différentes, même parfois opposées. A partir de ce constat, on procéde en trois pas : 1) On essaye de comprendre et de réduire ces termes à deux notions théoriques fondamentales et pratiquement maniables : a) le rapport, intérieur au signe linguistique, entre « concept » et « image acoustique », et b) le rapport « entre » termes (dont les signes) faisant partie d’un système. 2) On montre que, si l’on ne considère que ces deux notions, d’autres problèmes philologiques et conceptuels se révèlent ou se clarifient. 3) On suggére que ces problèmes se réduisent peut-être à une question ontologique : Quelle conception d’entité linguistique Saussure a-t-il en tête ? Le dernier point n'est qu’amorcé, mais on émet l’hypothèse qu’il est possible de reconstruire chez Saussure deux modèles différents – quoique non clairement différenciés – d’« unité » linguistique : un modèle qui serait repris et perfectionné par la phonologie pragoise ; un autre modèle qui serait développé, non sans problèmes, par l’école genevoise de linguistique. [less ▲]

Detailed reference viewed: 186 (0 ULg)
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See detailL'actualité du droit des ententes 2007
Petit, Nicolas ULg

Conference (2008, February 14)

Detailed reference viewed: 9 (0 ULg)
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See detailLes barrages de travertin de la vallée du Hoyoux
Franco, Bruno ULg

Conference (2008, February 13)

Detailed reference viewed: 38 (9 ULg)
See detailREconstruction of COLOUR scenes
Sirjacobs, Damien ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Poster (2008, February 12)

Detailed reference viewed: 19 (2 ULg)
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See detailMonitoring soil organic carbon in croplands using imaging spectroscopy (moca project)
Stevens, Antoine; van Wesemael, Bas; Tychon, Bernard ULg et al

Conference (2008, February 12)

The detection of changes in soil organic carbon (SOC) concentration is essential in both the assessment of SOC sequestration and soil quality. Within the EU soil thematic strategy the depletion of organic ... [more ▼]

The detection of changes in soil organic carbon (SOC) concentration is essential in both the assessment of SOC sequestration and soil quality. Within the EU soil thematic strategy the depletion of organic matter is mentioned as one of the major threats to the soil resource. As one of the first countries Luxemburg has taken the initiative to monitor the SOC concentration of individual fields to allow for eventual CO2 credits and as an indicator for good agro-ecological conditions (GAEC). The aim of this project is to develop an efficient and operational methodology to detect SOC changes in croplands using Imaging Spectroscopy and to map the SOC contents of croplands with high resolution and minimal calibration. [less ▲]

Detailed reference viewed: 28 (3 ULg)
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See detailGlobal agricultural monitoring systems by integration of earth observation and modelling techniques (globam project).
Defourny, Pierre; Bériaux, Emilie; Tychon, Bernard ULg et al

Conference (2008, February 12)

Nowadays, food security and crop production variability become a major concern. Moreover, in spite of major technological and methodological EO improvements observed since the late 1990’s, very little ... [more ▼]

Nowadays, food security and crop production variability become a major concern. Moreover, in spite of major technological and methodological EO improvements observed since the late 1990’s, very little change has been observed in the operational systems. A major gap exists between the remote sensing operationally used and the current scientific state of the art in EO crop monitoring. There is a lack of relevant field data over large areas, and these data are very much needed to gain a better understanding of potential improvements of the operational systems. [less ▲]

Detailed reference viewed: 41 (3 ULg)
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See detailDividends and foreign performance signaling
Muller, Aline ULg; Joliet, Robert

Conference (2008, February 07)

Detailed reference viewed: 7 (0 ULg)
See detailAutour de mai 68 : anticipation et régression dans Mécréance et Discrédit 3
Cormann, Grégory ULg

Conference (2008, February 05)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailTalking while walking in multiple sclerosis: Increased difficulty of walking abilities, deficit of working memory, or both?
DELRUE, Gaël ULg; Gryglewicz, Céline; Leonard, Yves et al

Poster (2008, February 02)

Detailed reference viewed: 34 (6 ULg)
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See detailNeonatal on-line respiratory mechanics: Stability and effect of ventilatory mode
Rigo, Vincent ULg; Rigo, Jacques ULg

in Edition Spéciale SBP, Vol 1 (2008, February)

Detailed reference viewed: 15 (3 ULg)
See detailThe business failure process : an integrative model
Crutzen, Nathalie ULg

Conference (2008, February)

Detailed reference viewed: 31 (8 ULg)
Peer Reviewed
See detailMente e metafisica in Franz Brentano
Boccaccini, Federico ULg

Conference (2008, February)

Detailed reference viewed: 20 (0 ULg)
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See detailEvaluation of instability hazards in rock masses influenced by mining works in the coal basin of Liege.
Schroeder, Christian ULg; Flamion, B.; Berger, J.-L. et al

in Post-Mining 2008 (2008, February)

Detailed reference viewed: 41 (7 ULg)
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See detailL'invention du concert : Une révolution du sens musical
Ledent, David ULg

in Appareil (2008, February), 1

Detailed reference viewed: 12 (0 ULg)
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See detailLa promotion immobilière et les marchés publics
Durviaux, Ann-Lawrence ULg

in Jurimpratique (2008, February), 1

Detailed reference viewed: 43 (11 ULg)
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See detailA Study on Observability and Sensor Selection for Efficient Jet Engine Health Monitoring
Borguet, Sébastien ULg; Léonard, Olivier ULg

in Proceedings of ISROMAC-12 (2008, February)

Detailed reference viewed: 26 (3 ULg)
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See detailWhat is the Role for Regulatory T-Cells after Nonmyeloablative conditioning
Humblet-Baron, S.; CASTERMANS, Emilie ULg; Vanbellighen, J.-F. et al

in Biology of Blood & Marrow Transplantation (2008, February), 14(2), 136-137

Detailed reference viewed: 17 (4 ULg)
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See detailImproved one-dimensional numerical simulation of transient mixed flow in water pipes network
Kerger, François ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 2nd ENVITAM PhD Day (2008, January 29)

Detailed reference viewed: 57 (15 ULg)
See detailLe traitement de l'ostéoporose de la femme jeune
Bruyère, Olivier ULg

Conference (2008, January 26)

Detailed reference viewed: 27 (3 ULg)
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See detailOsteogenesis imperfecta
Kaux, Jean-François ULg

Conference (2008, January 25)

Detailed reference viewed: 64 (28 ULg)
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See detailInventaire des dégâts d'écorcement en peuplements résineux
Gheysen, Thibaut ULg; Lejeune, Philippe ULg; Arnal, Delphine et al

Poster (2008, January 25)

Une gestion des populations de cervidés en harmonie avec la forêt et les multiples fonctions qu’elle est aujourd’hui amenée à remplir nécessite notamment de pouvoir apprécier de manière objective et ... [more ▼]

Une gestion des populations de cervidés en harmonie avec la forêt et les multiples fonctions qu’elle est aujourd’hui amenée à remplir nécessite notamment de pouvoir apprécier de manière objective et précise la pression exercée par la grande faune sur les zones davantage réservées à la production ligneuse. Les recensements par observations directes constituent souvent la principale source d’informations à partir desquelles il est habituel d’estimer les populations de cervidés et d’établir les plans de gestion de ces populations. Ces méthodes présentent cependant le double désavantage d’être coûteuses en moyens humains et de produire des résultats dont la précision et l’objectivité laissent parfois à désirer. Aussi, certains auteurs préconisent-ils de remplacer ou, à tout le moins, de compléter ces recensements par une observation des dégâts frais affectant la végétation ligneuse. [less ▲]

Detailed reference viewed: 66 (21 ULg)
See detailPolar lipids analysis from the MFGM by SPE and HPLC-ELSD
Bodson, Pascal ULg; Danthine, Sabine ULg; Blecker, Christophe ULg et al

Poster (2008, January 23)

Detailed reference viewed: 33 (9 ULg)
Peer Reviewed
See detailDonner la parole aux exclus au théâtre, analyse d’une expérience Belge.
Brahy, Rachel ULg

Conference (2008, January 23)

Detailed reference viewed: 29 (8 ULg)
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See detailLa membrane du globule gras du lait (MFGM) : une composition et une structure originale.
Bodson, Pascal; Vanderghem, Caroline ULg; Danthine, Sabine ULg et al

Poster (2008, January 23)

Detailed reference viewed: 38 (7 ULg)
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See detailProduire des graines de lin riches en oméga-3 est possible en Belgique
Bodson, Bernard ULg; Parmentier, Renaud; Vancutsem, Françoise ULg et al

in Treizième carrefour des productions animales: L'élevage des ruminants en question: vérités et contre-vérités (2008, January 23)

Detailed reference viewed: 25 (2 ULg)
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See detailDosage des sels minéraux du lait par la spectrométrie du moyen-infrarouge. Outil pratique à destination des chercheurs, éleveurs et industriels laitiers
Soyeurt, Hélène ULg; Bruwier, Damien; Dardenne, Pierre et al

in 13ième Carrefour des Productions animales: L'élevage des ruminants en question: vérités et contre-vérités (2008, January 23)

Detailed reference viewed: 351 (6 ULg)
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See detailOptiVal: Vers de nouveaux outils de gestion pour les éleveurs laitiers wallons, Prédire la réussite à l’insémination
Laloux, Laurent; Bastin, Catherine ULg; Glorieux, Géry et al

Poster (2008, January 23)

Detailed reference viewed: 7 (3 ULg)
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See detailAnalyse des lipides polaires de la MFGM par SPE et HPLC-ELSD
Bodson, Pascal ULg; Danthine, Sabine ULg; Blecker, Christophe ULg et al

in CRAW Gembloux (Ed.) Treizième Carrefour des Productions Animales : Vérités et Contre-Vérités (2008, January 23)

Detailed reference viewed: 53 (11 ULg)
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See detailA profitable pickup and delivery problem with time windows
Arda, Yasemin ULg; Crama, Yves ULg; Pironet, Thierry ULg

Conference (2008, January 18)

In most pickup and delivery problems, usually the aim is to minimize either the trip length or duration or the fleet size. Transportation orders or customers are finite sets which should be performed or ... [more ▼]

In most pickup and delivery problems, usually the aim is to minimize either the trip length or duration or the fleet size. Transportation orders or customers are finite sets which should be performed or visited integraly. So, the total earning is supposed to be constant. Conversely, the costs related to trip length or duration or either to the fleet size are consequences of the operations management efficiency. Therefore, typically the objective function is reduced to a cost minimization. On the contrary, this model tends to maximize the global profit. Let’s consider a fleet of vehicles starting at different initial times from different locations and oblige to return to their final depots before fixed maximal times. On their way-back, these vehicles are performing full-truck-load transportation between pickup and delivery points and have to respect time windows for the loading and unloading operations. Realized transportation orders add positive contributions while linking paths generate costs. In summary, the goal for the fleet resides in the selection of transportations orders among available ones while fullfilling the final time requirements and the time restrictions for the un/loading operations. [less ▲]

Detailed reference viewed: 308 (24 ULg)
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See detailThe Myth of White Earth in Uncanny Australia
Delrez, Marc ULg

Conference (2008, January 17)

Detailed reference viewed: 15 (3 ULg)
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See detailMeasuring a conceptual model of early turnover : a longitudinal perspective.
Bertrand, Françoise ULg; Schreurs, B.; Hansez, Isabelle ULg

Conference (2008, January 11)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailRegulating safety behaviour : job-related effects and perceived safety climate.
Hansez, Isabelle ULg; Chmiel, N.

Conference (2008, January 11)

Detailed reference viewed: 10 (1 ULg)
See detailHydrodynamic modelling, damage evaluation and technical adaptation measures
Dewals, Benjamin ULg

Conference (2008, January 10)

Detailed reference viewed: 5 (2 ULg)
Peer Reviewed
See detailObservations and comments on the Walloon Competitive Clusters
Antoine, Mélanie ULg

Conference (2008, January)

In recent years, the promotion of R&D partnerships between universities, research labs and companies has become a key feature of innovation and development public policies. However, these collaborations ... [more ▼]

In recent years, the promotion of R&D partnerships between universities, research labs and companies has become a key feature of innovation and development public policies. However, these collaborations turn out to be fragile and their management very complex. In our literature review, the congruence between the nature of innovations (i.e. their radicalness) and the cooperation practices appears as a potentially powerful explanatory factor of interfirm innovation project’s outcome. Following this hypothesis, we explore, on two case studies of projects subsidized by the Walloon Competitive Clusters program, the way actors innovate and organize their actions. Though they face similar constraints, these projects illustrate diverse configurations, not only as to the nature of innovations but also as to cooperation practices. Besides, the analysis reveals that the criteria used to characterize the nature of innovations do not necessarily form a homogeneous set of factors. Considering these observations, we try to identify the main challenges faced by both projects’ partners. [less ▲]

Detailed reference viewed: 39 (5 ULg)
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See detailEffects of intravenous lidocaïne in healthy adult horses.
Amory, Hélène ULg; Lopez Arevaldo, Diégo; Maes, An et al

Poster (2008, January)

Detailed reference viewed: 13 (7 ULg)
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See detailLe pousse-pousse à gougouttes
Terwagne, Denis ULg; Eddi, Antonin; Fort, Emmanuel et al

Conference (2008, January)

Detailed reference viewed: 24 (1 ULg)
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See detailThe Hazar pull-apart along the East Anatolian Fault: Structure and active deformation
Hubert, Aurelia ULg; Garcia, D; Moernaut, J et al

Conference (2008, January)

Detailed reference viewed: 15 (0 ULg)
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See detailImpact des séminaires de formations certificatifs sur les attitudes et pratiques évaluatives des enseignants en 1er bac
Leduc, Laurent ULg

in Mottier Lopez, Lucie; Dizerens, Yann-Eric; Marcoux, Géry (Eds.) et al Entre la régulation des apprentissages et le pilotage des systèmes: évaluations en tension. Actes du 20e colloque de l'ADMEE-Europe (2008, January)

Créé par obligation décrétale avec pour mission de « conseiller, encadrer et former les enseignants en charge des étudiants de première génération », le Centre de Didactique Supérieure (CDS) de l’Académie ... [more ▼]

Créé par obligation décrétale avec pour mission de « conseiller, encadrer et former les enseignants en charge des étudiants de première génération », le Centre de Didactique Supérieure (CDS) de l’Académie Universitaire Wallonie-Europe a développé pour ses encadrants universitaires de première année de bachelier un catalogue d’offre de formations à deux vitesses. En effet, dans le prolongement de « Séances thématiques présentielles », activités de sensibilisation à diverses problématiques de Pédagogie Universitaire articulées autour de témoignages d’enseignants et d’exposés d’experts, ont été conçus des « Séminaires de suivi en ligne », séquences d’apprentissage certificatives, impliquant de la part des participants la réalisation d’un dispositif pédagogique adapté à une difficulté identifiée. La présente communication décrit la procédure mise en œuvre afin d’évaluer, pour trois de ces séminaires virtuels (intitulés respectivement « Améliorer la maîtrise du français », « Accroître la motivation des étudiants » et « Concevoir des simulations d’examens »), leur impact sur le niveau d’appropriation par chacun des enseignants certifiés par le CDS des principes de la Triple Concordance Objectifs-Méthodes-Evaluation et de la nécessité de définir les objectifs d’apprentissage à atteindre par les étudiants. A cette fin, des données qualitatives collectées au cours de focus interviews individuelles ont été traitées à l’aide d’une grille d’analyse construite à partir d’éléments empruntés à l’aphorisme de Conrad Lorenz, à la taxonomie de David Krathwohl et au modèle de Rolland Viau. [less ▲]

Detailed reference viewed: 99 (32 ULg)
See detailAssessment of functional connectivity in fMRI data using wavelet-based resampling method.
Eryilmaz, H.; Van De Ville, D.; Desseilles, Martin ULg et al

Conference (2008, January)

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See detailSoil physical fertility: thesis project for water-soil-plant model improvement
Beckers, Eléonore ULg; Degre, Aurore ULg

Poster (2008, January)

Quantities of nutrients like N, P and K in the soil are generally assumed to be the more important parameters of its fertility. The physical fertility of the soil such as water holding capacity, hydraulic ... [more ▼]

Quantities of nutrients like N, P and K in the soil are generally assumed to be the more important parameters of its fertility. The physical fertility of the soil such as water holding capacity, hydraulic conductivity…is often ignored. The present thesis project purposes the development of a physically-based model linking agricultural practices and changes on soil physical properties. [less ▲]

Detailed reference viewed: 92 (14 ULg)
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See detailEvaluation of traffic polluting gases emissions using OR techniques: the case of the city of Tunis
Guirat, Noomen; de Wolf, Daniel ULg

Conference (2008, January)

The purpose of this paper is to show how the operations research techniques can help to evaluate the emissions of polluting gases from road traffic in urban area. Our practical study case is the center of ... [more ▼]

The purpose of this paper is to show how the operations research techniques can help to evaluate the emissions of polluting gases from road traffic in urban area. Our practical study case is the center of Tunis city. To evaluate the emissions of several polluting gases (CO, CO2, SO2, NOx, CH4 and VOC), we have combined the traffic assignment model ATESAME [1] with new module implementing the CORINAIR [2] formulas. The traffic assignment model corresponds to a static User Equilibrium model that can be computed by solving a nonlinear optimization problem (See Sheffi [5]). This nonlinear convex model can be efficiently solved by using the classical Frank Wolfe technique. The CORINAIR formulas give an expression of the unitary emissions, i.e. the emissions per kilometer, as a function of the vehicle speed and of the current temperature. Several scenarios of traffic congestion and emperature conditions have been simulated for the center of Tunis City. We present here the mains results from the simulations for the center of Tunis city. [less ▲]

Detailed reference viewed: 86 (6 ULg)
See detailSkipping 2 or 3 years for reproduction: the environmental determinant and the evolutionary consequences
Girondot, Marc; Georges, Jean-Yves; Guirlet, Elodie ULg

Conference (2008, January)

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See detailAchievements and Challenges in the Field of sdB Asteroseismology
Fontaine, Gilles; Charpinet, Stéphane; Green, Elizabeth M. et al

in Leaflet - Astronomical Society of the Pacific (2008, January), 392

We review briefly the status of sdB star asteroseismology. We concentrate on the main achievements that have been obtained so far, and we discuss the current challenges that we now face in the field.

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See detailLe gender mainstreaming dans les politiques locales
Cornet, Annie ULg

Conference (2008, January)

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See detailAn Asteroseismological Study of the Rapidly Pulsating Subdwarf B Star PG 0911+456
Randall, Suzanna K.; Green, Elizabeth M.; Van Grootel, Valérie ULg et al

in Leaflet - Astronomical Society of the Pacific (2008, January), 392

We present the analysis and interpretation of 57 hours of time-series photometry obtained with the new Mont4kccd on Mt. Bigelow, Arizona, for the rapidly pulsating sdB star PG 0911+456. Thanks to the ... [more ▼]

We present the analysis and interpretation of 57 hours of time-series photometry obtained with the new Mont4kccd on Mt. Bigelow, Arizona, for the rapidly pulsating sdB star PG 0911+456. Thanks to the impressively high S/N of the data we were able to extract 7 independent periodicities in the 140-200 s range with amplitudes down to 0.05 % of the mean stellar brightness. On the basis of these we performed an asteroseismological search for the optimal model and derived the star's fundamental parameters. Given that there are now 12 sdB stars for which asteroseismology has been performed, the results are starting to become significant from a statistical point of view and evolutionary trends are slowly emerging. [less ▲]

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See detailConstraints on Seismic Models of Balloon 090100001 through High-Sensitivity Multicolour Photometry
Charpinet, Stéphane; Fontaine, Gilles; Brassard, Pierre et al

in Leaflet - Astronomical Society of the Pacific (2008, January), 392

We report on an analysis of high S/N ratio UBV multicolour photometry of the bright pulsating sdB star Balloon 090100001 gathered at the Canada-France-Hawaii Telescope with the help of the Montreal 3 ... [more ▼]

We report on an analysis of high S/N ratio UBV multicolour photometry of the bright pulsating sdB star Balloon 090100001 gathered at the Canada-France-Hawaii Telescope with the help of the Montreal 3-channel photometer LAPOUNE. Through an application of the color-amplitude method described in Randall et al. (2005), we were able to identify the degree index ℓ of several individual pulsation modes. These identifications provide extremely useful constraints on possible seismic models for Balloon 090100001. [less ▲]

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See detailAn Asteroseismological Analysis of the Pulsating B Subdwarf Feige 48 Taking into Account Rotation
Van Grootel, Valérie ULg; Charpinet, Stéphane; Fontaine, Gilles et al

in Leaflet - Astronomical Society of the Pacific (2008, January), 392

We present a new analysis of the short period pulsating sdB star Feige 48 using the same observations as done in our previous work, but exploiting, this time, our new period-matching codes that include ... [more ▼]

We present a new analysis of the short period pulsating sdB star Feige 48 using the same observations as done in our previous work, but exploiting, this time, our new period-matching codes that include the rotation of the star. The pulsation spectrum of Feige 48 shows the signature of rotational splitting with a mean frequency spacing of about 28 μHz between the components of three different frequency multiplets. In addition, Feige 48 has been shown to be a member of a close binary system with an invisible (most likely a white dwarf) companion. Assuming various internal rotation laws, we are now able to fit all nine observed frequencies simultaneously, and not only the four m = 0 components that we identified a priori in our previous effort. For solid body rotation, our optimal model shows slightly different structural parameters than those obtained previously on the basis of purely spherical models. Interestingly, that optimal model is also characterized by a rotation period of 9.028 h, which falls exactly on the value of the orbital period found independently from spectroscopy, namely, 9.024 ± 0.072 h. This very strongly implies that Feige 48 is tidally locked, a suggestion quite consistent with theoretical expectations for such a close binary system. In the same vein, our investigations also demonstrate explicitly that the idea of a fast rotating core can be eliminated for Feige 48. [less ▲]

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See detailAn Efficient Numerical Model for the Numerical Simulation of Forming Processes
Ponthot, Jean-Philippe ULg; Boman, Romain ULg; Papeleux, Luc ULg et al

in Khan, Akhtar; Farrokh, Babak (Eds.) Mechanics and Mechanisms of Finite Plastic Deformation : Proceedings of PLASTICITY'08, Fourteenth International Symposium on Plasticity and its Current Applications (2008, January)

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case ... [more ▼]

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case, this method allows the use of a refined mesh near the tools, leading to an accurate representation of the chip formation (metal cutting) and the bending of the sheet (roll forming) with a limited computational time. [less ▲]

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See detailPrecise demarcation of the breakpoint in a thoroughbred stallion carrying a ECA5 and ECA16 Translocation.
Durkin, Keith ULg; Raudsepp, T; Chowdhary, B.P.

in Proceedings of Plant & Animal Genome XVI (2008, January)

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See detailAsteroseismic Solutions for the Two Fast Subdwarf B Pulsators Balloon 090100001 and PG 1336-018
Charpinet, Stéphane; Van Grootel, Valérie ULg; Brassard, Pierre et al

in Leaflet - Astronomical Society of the Pacific (2008, January), 392

We present two new asteroseismic studies of the rapid sdB pulsator PG 1336-018 and the hybrid sdB pulsator Balloon (BAL) 090100001. For PG 1336-018, the analysis is based on 25 periods extracted from the ... [more ▼]

We present two new asteroseismic studies of the rapid sdB pulsator PG 1336-018 and the hybrid sdB pulsator Balloon (BAL) 090100001. For PG 1336-018, the analysis is based on 25 periods extracted from the white-light photometry of the Xcov17 Whole Earth Telescope campaign (Kilkenny et al. 2003). For BAL 090100001, we use 10 periods of high amplitudes for which constraints on the ℓ-index have been derived from high S/N multicolour photometry. From asteroseismology, we estimate important structural parameters for these two stars, including the stellar mass and the H-rich envelope thickness. The analyses presented here are of particular interest since the asteroseismic results can be tested using independent constraints, which confirm the robustness of the solutions in both cases. [less ▲]

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See detailEffects of two levels of energy allowances and of hibernation on growth in hatchling Testudo hermanni boettgeri (Mojsisovic, 1889)
Diez, Marianne ULg; Vanstrazeele, Boris; Detilleux, Johann ULg et al

in Fidgett, Andrea; Noble, Jacqueline E (Eds.) Abstract book of the 5th European Zoo Nutrition Conference (2008, January)

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See detailOptimal dimensioning of pipe networks: the new situation when the distribution and the transportation functions are disconnected
Bakhouya, Bouchra; de Wolf, Daniel ULg

Conference (2008, January)

In [9], De Wolf and Smeers consider the problem of the optimal dimensioning of a gas transmission network when the topology of the network is known. The pipe diameters must been chosen to minimize the sum ... [more ▼]

In [9], De Wolf and Smeers consider the problem of the optimal dimensioning of a gas transmission network when the topology of the network is known. The pipe diameters must been chosen to minimize the sum of the investment and operating costs. This two stage prob- lem was solved by application of the bundle method for nonsmooth optimization. This model does not re ect any more the current situation on the gas industry. Today, the transportation function and gas buying func- tion are separated. This work considers the new situation for the trans- portation company. The objective for the transportation company is to determine the ows in the network that minimize the energy used for the gas transport. This corresponds to the minimization of the power used in the compressors. We introduce in the investment problem new decision variables, namely the maximal power of the compressor. We present here rst results obtained on the belgian gas network and on a realistic network corresponding to a part of the french network. [less ▲]

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See detailMéthode des éléments finis et technique de perturbation pour la modélisation du contrôle non destructif par courants de Foucault
Dular, Patrick ULg

Conference (2008, January)

La méthode des éléments finis est par nature bien adaptée à la modélisation du contrôle non destructif par courants induits dans des structures à géométrie complexe. Elle peut en effet être appliquée à la ... [more ▼]

La méthode des éléments finis est par nature bien adaptée à la modélisation du contrôle non destructif par courants induits dans des structures à géométrie complexe. Elle peut en effet être appliquée à la géométrie réelle d'un système, constitué de matériaux conducteurs et magnétiques de formes complexes, pour à la fois les pièces à inspecter (régions courbes, arêtes, coins, etc.) et les sondes (avec noyaux de ferrite, bobines multiples et différentielles, etc.). Pour des raisons d'efficacité de calcul, son application brutale n'est néanmoins pas avantageuse et des simplifications ou adaptations de différentes natures sont les bienvenues. Cela est particulièrement vrai du fait de la nature très souvent tridimensionnelle des problèmes à résoudre et du caractère répétitif des calculs liés à des variations de caractéristiques géométriques et physiques. Notre méthodologie pour tendre vers une résolution efficace de tels problèmes est basée sur une approche par sous-problèmes avec calculs de perturbations de solutions associées. L'objectif est de tirer profit de résolutions antérieures plutôt que d'entamer un nouveau calcul pour chaque nouveau jeu de paramètres. Cette technique, dite de perturbation, porte sur la limitation du domaine d'étude à une portion réduite du système dans le voisinage des défauts. Le champ inconnu à calculer est plutôt directement la composante de perturbation du champ par le défaut (le champ perturbé moins le champ non perturbé), composante qui est par nature de très faible intensité devant le champ total. Des soustractions directes de champs très proches et issus de deux calculs différents, avec et sans défaut, donnent en effet lieu à d'importantes erreurs (l'erreur de discrétisation prenant le dessus sur l'écart relatif très faible des solutions avec et sans défaut, généralement inférieur à 1%), ce qui rend nécessaire l'utilisation d'un même maillage pour les calculs (présentant des erreurs de discrétisation équivalentes). La charge de calcul s'en voit alourdie, surtout par le fait que de nombreux calculs doivent s'enchaîner pour des positions relatives de sondes et défauts différentes. L'objectif des problèmes directs ainsi définis est en effet de relever des cartographies de variations d'impédances qui enrichiront la base de données d'un problème inverse devant prédire la position et la taille de défauts sur base de mesures. Le méthode de perturbation développée permet de calculer directement la déformation des courants induits due au défaut. La calcul est décomposé en un calcul sans défaut et une série de calculs de la déformation du champ magnétique, et du courant induit associé, due à des défauts de positions et de tailles différentes. Le champ non perturbé, i.e. en l'absence de défaut, est d'abord calculé sur une grande région en tirant parti d'éventuelles symétries ou de solutions analytiques. Il est ensuite appliqué comme source dans le défaut, généralement pour une série de positions et de tailles, pour un second calcul. Le transfert des sources d'un problème à un autre requiert la projection de solutions entre des espaces de discrétisation (maillages) et des discrétisations adéquates EF des champs impliqués satisfaisant certaines propriétés de conformité. Le champ perturbé peut alors être déterminé dans un domaine réduit autour du défaut, ce qui permet une discrétisation mieux adaptée à la taille du défaut, généralement très réduite par rapport au domaine entier considéré. La variation d'impédance des sondes est finalement calculée par une intégration limitée au défaut et à son voisinage immédiat. Différents exemples d'application permettront d'illustrer et de valider les différentes étapes de la méthode. [less ▲]

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See detailSecondary Consequences of the Distinction between Taxes an the other Modes of Financing Government Expenditure
Bourgeois, Marc ULg

in Peeters, B. (Ed.) The Concept of Tax (2008)

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

Poster (2008)

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