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Peer Reviewed
See detailEquivalence of item difficulties across national versions in PIRLS and PISA reading assessment
Grisay, Aletta; Monseur, Christian ULg; Gonzalez, E.

Conference (2008, March)

Detailed reference viewed: 5 (0 ULg)
See detailPlus efficaces ou plus équitables, faut-il choisir ?
Monseur, Christian ULg

Conference (2008, March)

Detailed reference viewed: 2 (0 ULg)
See detailSpontaneous emission from a tunneling atom
Braun, Daniel; Martin, John ULg

Conference (2008, March)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailTunable Random Packings
Lumay, Geoffroy ULg

Conference (2008, March)

Detailed reference viewed: 3 (2 ULg)
See detailL'Europe à l'épreuve de l'anthropologie: une identité introuvable?
Seba, Jean-Renaud ULg

Conference (2008, March)

Detailed reference viewed: 15 (2 ULg)
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Peer Reviewed
See detailComparison of bovine and human O26 EHEC strains by the Whole Genome PCR Scanning
Bardiau, Marjorie ULg; Ogura, Y.; Hayashi, T. et al

Conference (2008, March)

Detailed reference viewed: 9 (0 ULg)
See detailScreenings Toxicologiques: apport d'un système HPLC/DAD
Denooz, Raphael ULg; Dubois, Nathalie ULg

Conference (2008, March)

Detailed reference viewed: 14 (3 ULg)
Peer Reviewed
See detailMX dynamins and the innate resistance opposed to influenza virus.
Garigliany, Mutien-Marie ULg; Baise, Etienne; Cloquette, Karine et al

Conference (2008, March)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailThe salience of morphemic units for dyslexic and normal readers of English and French.
Duncan, Lynne; Quemart, Pauline ULg; Casalis, Séverine

Conference (2008, March)

Detailed reference viewed: 15 (1 ULg)
See detailHDAC6 Inhibition compensates for the transport deficit in Huntington’s Disease by increasing tubulin acetylation
Godin, Juliette ULg; Dompierre; Charrin, Bénédicte C. et al

Conference (2008, March)

Detailed reference viewed: 8 (1 ULg)
See detailLes cadets de l’Alcazar. Parcours francophones d’une mythologie franquiste
Denis, Benoît ULg

Conference (2008, March)

Detailed reference viewed: 11 (1 ULg)
Peer Reviewed
See detailParental presence in the PICU
VIELLEVOYE, Renaud ULg; TRIPPAERTS, Marc ULg

Conference (2008, February 29)

Detailed reference viewed: 14 (0 ULg)
See detailLe Traité de Lisbonne: Traité simplifié ou constitution cachée?
Petit, Nicolas ULg

Conference (2008, February 29)

Detailed reference viewed: 36 (3 ULg)
Full Text
See detailQualité paysagère, montage immobilier et compétitivité régionale
Halleux, Jean-Marie ULg; Henneberry, J.

Conference (2008, February 27)

Detailed reference viewed: 10 (2 ULg)
Full Text
Peer Reviewed
See detailUn problème de chargement/déchargement profitable d'une flotte de véhicules soumise à des fenêtres de temps
Arda, Yasemin ULg; Crama, Yves ULg; Pironet, Thierry ULg

Conference (2008, February 26)

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: 153 (30 ULg)
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Peer Reviewed
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: 73 (2 ULg)
See detailProtection cardiovasculaire et rénale chez le patient diabétique
Krzesinski, Jean-Marie ULg

Conference (2008, February 23)

Detailed reference viewed: 5 (4 ULg)
See detailProtection cardiovasculaire et rénale chez le patient diabétique
Krzesinski, Jean-Marie ULg

Conference (2008, February 23)

Detailed reference viewed: 7 (6 ULg)
Full Text
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: 16 (1 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: 86 (8 ULg)
Full Text
See detailDiagnostic des infections sexuellement transmissibles.
HUYNEN, Pascale ULg

Conference (2008, February 21)

Detailed reference viewed: 9 (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: 28 (3 ULg)
Peer Reviewed
See detailLe système éducatif de la Communauté française de Belgique
Baye, Ariane ULg

Conference (2008, February 19)

Detailed reference viewed: 5 (1 ULg)
See detailAlimentation pendant la première année de vie
Senterre, Thibault ULg

Conference (2008, February 16)

Detailed reference viewed: 25 (4 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 ▲]

Detailed reference viewed: 35 (1 ULg)
Peer Reviewed
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: 68 (0 ULg)
Peer Reviewed
See detailL'actualité du droit des ententes 2007
Petit, Nicolas ULg

Conference (2008, February 14)

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailLes barrages de travertin de la vallée du Hoyoux
Franco, Bruno ULg

Conference (2008, February 13)

Detailed reference viewed: 24 (5 ULg)
Full Text
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: 17 (2 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: 30 (1 ULg)
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Peer Reviewed
See detailDividends and foreign performance signaling
Muller, Aline ULg; Joliet, Robert

Conference (2008, February 07)

Detailed reference viewed: 5 (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: 4 (0 ULg)
See detailThe business failure process : an integrative model
Crutzen, Nathalie ULg

Conference (2008, February)

Detailed reference viewed: 30 (8 ULg)
Peer Reviewed
See detailMente e metafisica in Franz Brentano
Boccaccini, Federico ULg

Conference (2008, February)

Detailed reference viewed: 9 (0 ULg)
See detailLes attitudes des jeunes de 15 ans à l’égard des sciences.
Baye, Ariane ULg

Conference (2008, January 29)

Detailed reference viewed: 2 (1 ULg)
See detailLe traitement de l'ostéoporose de la femme jeune
Bruyère, Olivier ULg

Conference (2008, January 26)

Detailed reference viewed: 8 (3 ULg)
Full Text
See detailOsteogenesis imperfecta
Kaux, Jean-François ULg

Conference (2008, January 25)

Detailed reference viewed: 60 (26 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: 25 (8 ULg)
Full Text
Peer Reviewed
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: 274 (24 ULg)
Peer Reviewed
See detailThe Myth of White Earth in Uncanny Australia
Delrez, Marc ULg

Conference (2008, January 17)

Detailed reference viewed: 8 (2 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)
Peer Reviewed
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: 9 (0 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 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 ▲]

Detailed reference viewed: 52 (3 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: 12 (0 ULg)
Full Text
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 ▲]

Detailed reference viewed: 48 (4 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)

Detailed reference viewed: 7 (0 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: 29 (5 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: 15 (0 ULg)
Full Text
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: 74 (6 ULg)
See detailLe gender mainstreaming dans les politiques locales
Cornet, Annie ULg

Conference (2008, January)

Detailed reference viewed: 25 (1 ULg)
Peer Reviewed
See detailEnglish and Spanish Size Noun-constructions, a locus of ongoing grammaticalization
Brems, Lieselotte ULg; Verveckken, Katrien

Conference (2008)

Detailed reference viewed: 8 (5 ULg)
See detailUsing monovariate and multivariate EOFs to reconstruct missing data with DINEOF
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Sirjacobs, Damien ULg et al

Conference (2008)

DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based method to reconstruct missing data in geophysical data sets. DINEOF can be used to reconstruct monovariate data sets (as sea ... [more ▼]

DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based method to reconstruct missing data in geophysical data sets. DINEOF can be used to reconstruct monovariate data sets (as sea surface temperature (SST), chlorophyll, etc), and multivariate data sets with little increase in complexity. For multivariate reconstructions, extended EOFs are used, which take into account the interrelationships between related variables to infer data at missing locations. Spatial maps of the standard deviation of the reconstruction error can be also calculated. In the past, DINEOF has been compared to Optimal Interpolation (OI) techniques for the Adriatic Sea SST. The results showed that DINEOF was faster than OI, making it very suitable for operational applications. DINEOF was also more accurate when compared to in situ data. Another advantage of DINEOF is that there is no need for a priori knowledge of the statistics of the reconstructed data set (such as covariance or correlation length), thus reducing the subjectivity of the analysis. DINEOF has been successfully used to reconstruct a large variety of domains over the world ocean, mostly at the regional scale. In addition to an overview of the technique's capabilities, limitations and future developments, recent work aimed to improve the quality of the reconstructions at the global and local scales will be presented. [less ▲]

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See detailDistributed Collaborative Design Studio : a sketch-based environment to support rich distant collaboration. Workshop.
Safin, Stéphane ULg; Delfosse, Vincent ULg; Elsen, Catherine ULg et al

Conference (2008)

An increasing number of large scale projects requires that distant teams collaborate together remotely. At the same time, the current CAD tools only offer minimal support for partial and asynchronous ... [more ▼]

An increasing number of large scale projects requires that distant teams collaborate together remotely. At the same time, the current CAD tools only offer minimal support for partial and asynchronous interactions. The application we propose enables full synchronous and remote sketch-based collaborative design. This setup is a combination of a virtual desktop (a remote meeting table), a standard videoconference system, a gesture recognition module and a networked, real-time, collaborative drawing software (SketSha). The solution as a whole is multimodal in essence (gestures, speech, drawing…) supporting immersive remote collaborative design. [less ▲]

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See detailHeat pumping and reversible air conditioning : how to make the best use of HVAC equipment ?
Bertagnolio, Stéphane ULg; Lebrun, Jean ULg; Andre, Philippe ULg et al

Conference (2008)

Substituting a heat pump to a boiler may save more than 50% of primary energy, if electricity is produced by a modern combined cycle power plant (and even more if a part of that electricity is produced ... [more ▼]

Substituting a heat pump to a boiler may save more than 50% of primary energy, if electricity is produced by a modern combined cycle power plant (and even more if a part of that electricity is produced using renewable sources). Two of the most attractive heat pumps applications consist in recovering the heat rejected by the condenser of an existing chiller and in using this chiller in reversible mode. This is the topic of the IEA-ECBCS Annex 48 project (“Heat pumping and reversible air conditioning”). An overview of the project is presented and the work of the different participants is briefly explained. Case studies are also briefly presented and more details are given on one of them. [less ▲]

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See detailFrom strokes to model: a bottom-up approach for sketching activities analysis. Workshop.
Safin, Stéphane ULg; Juchmes, Roland ULg; Elsen, Catherine ULg et al

Conference (2008)

This paper proposes a framework for sketches analysis that could be useful for sketch-based interfaces development, in the particular context of preliminary activity-centred design. We will first describe ... [more ▼]

This paper proposes a framework for sketches analysis that could be useful for sketch-based interfaces development, in the particular context of preliminary activity-centred design. We will first describe our previous works on sketch-based support tools for the preliminary design phases and the context of these researches. The next chapter declares the concrete objectives of our approach, then the methodology of sketches analysis we propose is presented with a concrete example, and finally the last section is dedicated to the expected results and specifications of a sketch-based support tool that would follow our framework. [less ▲]

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See detailStrained silicon on wafer level by wafer bonding: materials processing, strain measurements and strain relaxation
Reiche, M.; Moutanabbir, O.; Himcinschi, C. et al

Conference (2008)

Detailed reference viewed: 28 (1 ULg)
See detailLa nostalgie du passé colonial belge. Approche comparative
Rubbers, Benjamin ULg

Conference (2008)

Detailed reference viewed: 42 (4 ULg)
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See detailImpact of prosthesis-patient mismatch on short-term mortality following mitral valve replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2008)

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See detailImpact of Prosthesis-Patient Mismatch on Short-term Mortality Following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2008)

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See detailThermocline characterization on modeled and observed temperature profiles: a technique for model error evaluation
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg

Conference (2008)

The thermocline position in the water column is an important variable in hydrodynamic modeling. Its characterization allows to verify the model accuracy, and analyze the parameter choice made by the ... [more ▼]

The thermocline position in the water column is an important variable in hydrodynamic modeling. Its characterization allows to verify the model accuracy, and analyze the parameter choice made by the modeler, such as the choice of the turbulence closure. A correct representation of the surface ocean boundary layer is also very important in order to correctly represent the air-sea exchanges. Moreover, coupled physicalbiological models require a good representation of the thermocline position, in order to correctly represent the population dynamics at the surface layers. We present a technique to calculate the parameters of the thermocline: depth, width and temperature. These are calculated by a least-squares fitting of individual temperature profiles (from model and observations) to a sigmoid function. The residual is also obtained, giving an estimate of the goodness of the fit. The parameters calculated allow for a comparison of the model thermocline to observations. Our approach consists in comparing the model thermocline depth, width and temperature to observations. By examining separately the accuracy of the model thermocline depth and temperature, we gain insight in the processes that need correction in the model. For example, if the model thermocline is too deep compared to observations, or the width of the thermocline is incorrect, mixing parameters and surface momentum fluxes should be revised. However, if the depth is well represented but the temperature is incorrect, the surface heat fluxes may be the source of the error. By simply comparing model and observed temperature profiles we are not able to differentiate between error sources. The technique presented here stands therefore as a useful method for model evaluation. [less ▲]

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See detailRisk-aware decision making and dynamic programming
Defourny, Boris ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

Conference (2008)

This paper considers sequential decision making problems under uncertainty, the tradeoff between the expected return and the risk of high loss, and methods that use dynamic programming to find optimal ... [more ▼]

This paper considers sequential decision making problems under uncertainty, the tradeoff between the expected return and the risk of high loss, and methods that use dynamic programming to find optimal policies. It is argued that using Bellman's Principle determines how risk considerations on the return can be incorporated. The discussion centers around returns generated by Markov Decision Processes and conclusions concern a large class of methods in Reinforcement Learning. [less ▲]

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See detailThe Hybrid Finite-Element Mixing-Cell method: a new flexible method for large scale groundwater modelling
Orban, Philippe ULg; Brouyère, Serge ULg; Wildemeersch, Samuel ULg et al

Conference (2008)

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from ... [more ▼]

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from black-box models to physically based distributed models have been used in various hydrogeological conditions. Black-box models, such as transfer functions, have been applied for example to model groundwater in large scale hydrological models, to model karstic systems, in particular for the interpretation of isotopic data. Their concepts are simple and attractive because they require relatively few data. The main drawbacks are however that modelling results are not spatially distributed and their predictive capability is questionable due to the semi-empirical nature of process descriptions. On the contrary, due to a more advanced description of ongoing processes, physically-based distributed models are expected to have better predictive capabilities than black-box models. However, because such models require more data, they are generally applied for case studies that are better characterized from a hydrogeological point of view, for which the distribution of water levels or solute concentrations in the groundwater systems are needed. For large-scale modelling purposes, black-box models and physically-based distributed models have both proved their utilities and have their own justifications, advantages and disadvantages. However, few attempts have been made to combine the advantages of these two categories of approaches in a unified modelling application. A new flexible modelling approach, the Hybrid Finite-Element Mixing-Cell method (HFEMC), has been developed that allows combining in a single model, and in a fully integrated way, different mathematical approaches of various complexities for groundwater modelling in complex and large scale environments. This method has been implemented in the groundwater flow and solute transport numerical code SUFT3D. The approach has been first tested and illustrated using basic and advanced “synthetic” examples that allow validating and discussing its advantages over existing modelling concepts. The HFEMC approach is now applied for the development of a large scale groundwater flow and solute transport model in different groundwater basins in Belgium. [less ▲]

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See detailConstruction et droit de la consommation: propos introdutifs
Kohl, Benoît ULg

Conference (2008)

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See detailA distinctive marginal marine palynological assemblage from the Pridoli of Northwestern Saudi Arabia
Al-Hajri, S.; Verniers, J.; Paris, F. et al

Conference (2008)

This paper describes a rare occurrence of a rich and diverse palynological assemblage from a controversial stratigraphic unit in well EW8 in northwestern Saudi Arabia. The composition of this assemblage ... [more ▼]

This paper describes a rare occurrence of a rich and diverse palynological assemblage from a controversial stratigraphic unit in well EW8 in northwestern Saudi Arabia. The composition of this assemblage strongly suggests a Pridoli age and therefore it is referred here to the Tawil Formation. The assemblage encountered contains very characteristic chitinozoans, acritarchs, tasmanities, scolecodontsm, eurypterid cuticle and common land-derived miospores and hilate cryptospores. Chitinozoans such as Margachitina elegans, Ancyrochitina fragilis brevis, Ancyrochitina fragilis, Sphaerochitina sphaerocephala, Urnochitina urna, Pseudochlathrochitina carmenchui and Lagenochitina brevicollis confer the Pridoli age assignment. This assemblage of chitinozoans correlates very well with Assemblage D from the Alternances Gréso-Argileuses Formation of the A1-61 well in northwestern Libya. Among the acritarchs present are: Cymbosphaeridium pilar, Leoniella carminae,Diexallophasis spp., Tunisphaeridium cf caudatum, Leiofusa estrecha and Eupoikilofusa striatifera. <br /> <br />Furthermore, the join occurrence of U. urna, P. carmenchui and M. elegans is clearly indicative of the middle part of the Pridoli as in the Libyan well A1-61, and in many wells in Algeria. This corresponds to what is considered to be a transgressive mid Pridoli event in the Algerian Sahara, with non marine intervals bracketing this brief marine sea level rise. This event is likely to have extended into all of north Gondwana including Arabia. [less ▲]

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See detailRestoration assessment of calcareous grasslands in Belgium : soil conditions and floristic diversity
Piqueray, Julien ULg; Bottin, Gaëtan; Bisteau, Emmanuelle et al

Conference (2008)

Detailed reference viewed: 23 (4 ULg)