Results 121-140 of 54540.
Bookmark and Share    
Full Text
See detailCarte géologique de Wallonie à l'échelle 1:25 000. Hamoir-Ferrières n°49/1-2
Marion, Jean-Marc ULiege; Barchy, Laurent

Cartographic material (in press)

New geological map of Wallonia published at the scale of 1/25 000, based on a new field work and using previous scientific data produced since the previous editions of Lohest and Fourmarier (1900)

Full Text
Peer Reviewed
See detailElectric Power Network State Tracking from Multirate Measurements
Alcaide-Moreno, Boris; Fuerte-Esquivel, Claudio; Glavic, Mevludin ULiege et al

in IEEE Transactions on Instrumentation and Measurement (in press)

This paper proposes a novel tracking state estimator to process both fast-rate synchronized phasor and slow rate SCADA measurements. The former are assumed to be in limited number. The latter are ... [more ▼]

This paper proposes a novel tracking state estimator to process both fast-rate synchronized phasor and slow rate SCADA measurements. The former are assumed to be in limited number. The latter are exploited as and when they arrive to the control center. In order to restore observability, after each execution of the tracking state estimator, forecasted SCADA measurements are used as pseudo-measurements in the next estimation. An event detection analysis allows assessing if the system is in quasi steady-state. If so, an innovation analysis is performed to identify and eliminate erroneous SCADA measurements. The system state is computed by Hachtel’s augmented matrix method. The option of exploiting time-tagged SCADA measurements is also considered. The method is illustrated through detailed dynamic simulations of a test system evolving towards voltage collapse, with and without emergency control. [less ▲]

Detailed reference viewed: 24 (6 ULiège)
Full Text
See detailDroit constitutionnel belge (année académique 2017-2018) - Principes de droit constitutionnel belge
Behrendt, Christian ULiege

Book published by ... (in press)

Syllabus pour le cours de Droit constitutionnel (DROI1203-4) en baccalauréat en droit de l'Université de Liège, Faculté de Droit.

Detailed reference viewed: 20357 (4176 ULiège)
Full Text
Peer Reviewed
See detailPaper Formats of the Mamluk Period: The Contribution of Mamluk Chancery Paper
Bauden, Frédéric ULiege

in Journal of Islamic Manuscripts (in press)

Detailed reference viewed: 71 (2 ULiège)
Full Text
Peer Reviewed
See detailCharleroi, the 'placerelle'
Bianchi, Michaël ULiege

in Masterclass Bridges (in press)

Detailed reference viewed: 24 (1 ULiège)
Full Text
Peer Reviewed
See detailEléments de réflexions à propos de l’occupation de la parcelle de la Schola del Traiano (IV, V, 15-16)
Morard, Thomas ULiege

in De Ruyt, Claire; Morard, Thomas; Van Haeperen, Françoise (Eds.) Ostia Antica. Nouvelles études et confrontation des recherches sur les quartiers occidentaux de la cité (in press)

Detailed reference viewed: 36 (14 ULiège)
Full Text
Peer Reviewed
See detailTwo-loop-induced neutrino masses: A model-independent perspective
Aristizabal Sierra, Diego ULiege

in PoS - Proceedings of Science (in press)

We disucuss Majorana neutrino mass generation mechanisms at the two-loop order. After briefly reviewing the systematic classification of one-loop realizations, we then focus on a general two-loop ... [more ▼]

We disucuss Majorana neutrino mass generation mechanisms at the two-loop order. After briefly reviewing the systematic classification of one-loop realizations, we then focus on a general two-loop classification scheme which provides a model-independent catalog for neutrino mass models at the two-loop order [less ▲]

Detailed reference viewed: 16 (2 ULiège)
Full Text
Peer Reviewed
See detailLe IIe style en reliefs : les ensembles de stucs de la Domus aux Bucranes à Ostia Antica
Morard, Thomas ULiege; Girard, Thibault

in Bragantini, Irene; Flazone, Stella; Fortini, Patrizia (Eds.) et al Pitture frammentarie di epoca romana da Roma e dal Lazio : nuove ricerche (in press)

The publication of the book Nani in Festa. Iconografia, religione e politica in Ostia durante il secondo triumvirato (C. Bocherens ed., Edipuglia, 2012) was the occasion to highlight the exceptional ... [more ▼]

The publication of the book Nani in Festa. Iconografia, religione e politica in Ostia durante il secondo triumvirato (C. Bocherens ed., Edipuglia, 2012) was the occasion to highlight the exceptional decorative system of the “Domus aux Bucranes” and, especially, to put forward the frieze of dwarfs and its interpretation. With the discovery of these paintings, in the œcus, we have discovered a remarkable collection of stuccos, until today remains unpublished. This article gives a first description and an initial analysis of the fragments of stucco. Their placement on the wall and their relationship with pavements, frescoes and painted ceilings are studied, as well as the iconography they carrying, in close relation with the context of the domus, and, more generally, with Ostia in the late-republican period. [less ▲]

Detailed reference viewed: 65 (17 ULiège)
Full Text
Peer Reviewed
See detailUtiliser les potentialités phénoménotechniques de la Théorie Anthropologique du Didactique : quel prix payer ?
Schneider-Gilot, Marguerite ULiege

in Travaux relatifs à la Théorie Anthropologique du Didactique (Université de Toulouse) (in press)

Detailed reference viewed: 17 (2 ULiège)
Full Text
Peer Reviewed
See detailL’emblématique de Louise de Savoie
Fagnart, Laure ULiege; Girault, Pierre-Gilles

in Armas e Troféus. Rivista de Historia, Heraldica, Genealogia (in press)

A l'occasion de cette étude, à la suite des travaux d'Anne-Marie Lecoq (1987), nous sommes revenus sur le discours héraldique de la comtesse et duchesse d'Angoulême, Louise de Savoie, l'influente mère de ... [more ▼]

A l'occasion de cette étude, à la suite des travaux d'Anne-Marie Lecoq (1987), nous sommes revenus sur le discours héraldique de la comtesse et duchesse d'Angoulême, Louise de Savoie, l'influente mère de François Ier. Nous avons présenté et explicité ses devises favorites, à savoir la cordelière, qui évoque autant le nœud de Savoie que la cordelière franciscaine, le vol, sans doute choisi puisque l’aile évoque le L de Louise par homophonie, le bouquet de lis ou le cygne « navré », mais aussi les écus et les monogrammes qui lui sont associés et qui ponctuent enluminures, tapisseries, bas-reliefs et éléments sculptés de l’architecture. Notre intention a été de montrer d’une part comment Louise de Savoie manifeste, par l’intermédiaire de ces signes emblématiques, son identité et son pouvoir, d’autre part comment elle construit, par leur biais, un patrimoine, mental, susceptible de renforcer son clan et ses héritiers. [less ▲]

Detailed reference viewed: 79 (3 ULiège)
Full Text
Peer Reviewed
See detailConscience interne et connaissance de soi. Descartes et Brentano
Dewalque, Arnaud ULiege

in Pradelle, Dominique; Riquier, Camille (Eds.) Descartes et la phénoménologie (in press)

J'examine ici l’approche cartésiano-brentanienne de la conscience. Cette approche comporte une thèse psychologique ("tout ce qui est mental est conscient") et une double thèse épistémologique ("toute ... [more ▼]

J'examine ici l’approche cartésiano-brentanienne de la conscience. Cette approche comporte une thèse psychologique ("tout ce qui est mental est conscient") et une double thèse épistémologique ("toute conscience interne est évidente"/'aucune perception externe n'est évidente"). On a souvent considéré que ces thèses se heurtaient à d’imposantes difficultés et rendaient l’approche cartésiano-brentanienne de la conscience particulièrement problématique. Contre ces critiques, certains commentateurs ont récemment suggéré qu’on pouvait toutefois donner un sens acceptable à la thèse psychologique. Je voudrais suggérer, pour ma part, qu’on peut aussi donner un sens acceptable à la double thèse épistémologique. Dans la section 2, je reconstruit la position cartésiano-brentanienne en termes d'asymétrie épistémique entre perception interne et perception externe. Dans les sections 3 et 4, je discute les objections soulevées par Husserl et par Ryle, et je suggère que la théorie brentaniexnne permet de réfuter ces objections. [less ▲]

Detailed reference viewed: 79 (5 ULiège)
Full Text
See detailAdaptive Facades Performance Assessment, interviews with facade experts
Attia, Shady ULiege; Bilir, Senem; Safy, Taha

Report (2018)

Adaptive facades can ensure step-change progresses in the energy efficiency and the use of renewable energy while improving the comfort of the occupants. Therefore, the purpose of this structured ... [more ▼]

Adaptive facades can ensure step-change progresses in the energy efficiency and the use of renewable energy while improving the comfort of the occupants. Therefore, the purpose of this structured interview is to assess advantages, disadvantages and future expectations considering the adaptive facades. This work is a part of actions of The COST Action TU1403 Adaptive Façade Network. The objective of this report is to gain an understanding of how experts currently define adaptive façade systems, which simulation tools they use, the major strengths, weaknesses, opportunities and treats of adaptive façade systems, key performance indicators they use and their vision for the future of adaptive facades. With this information gathered, it is anticipated that adaptive façade professionals will carry on assessment of adaptive facades. A qualitative study design was employed, using semi-structured interviews. Interviewees working in academia and practice were selected. The interviewees represented the range of possible adaptive facade professionals, from researchers and designers considered optimization in the assessment of adaptive facades. Also, every interviewed expert was asked to approve their responses and add any additional comment to their answers. [less ▲]

Detailed reference viewed: 24 (7 ULiège)
Full Text
Peer Reviewed
See detailEvaluation of Adaptive Facades: A case study of the Swiss School in Dubai
Bilir, Senem; Attia, Shady ULiege

in Luible, Andreas (Ed.) Adaptive Facades (2018, October)

Adaptive facades are performance based envelopes that are able to respond dynamically to climatic conditions. One of the recognized adaptive façade technologies is electrochromic glazing. However, very ... [more ▼]

Adaptive facades are performance based envelopes that are able to respond dynamically to climatic conditions. One of the recognized adaptive façade technologies is electrochromic glazing. However, very few studies evaluated the performance of electrochromic glazing on the building level. Therefore, we selected a case study of a certified educational building with a nearly zero energy building performance that includes an electrochromic facade. The overall aim of the research is to understand the performance requirements of electrochromic glazing and its overall contribution to energy saving s and thermal and visual comfort improvement. The performance of the Swiss International School in Dubai was analyzed based on interviews with the design and build team, monitored data and post occupancy evaluation. A systematic process mapping took place to review the performance indicators, simulation tools and team responsibilities during the design, construction and operation stages of the building. The paper identifies the key performance criteria of electrochromic glazing in relation to energy and comfort. Finally, we assess the significance of using electrochromic glazing from a technical point of view and share the learned lessons for architects and facade engineers [less ▲]

Detailed reference viewed: 27 (6 ULiège)
Full Text
See detailAn Optimal Control Formulation of Pulse-Based Control Using Koopman Operator
Sootla, Aivar; Mauroy, Alexandre; Ernst, Damien ULiege

E-print/Working paper (2018)

In many applications, and in systems/synthetic biology in particular, it is desirable to compute control policies that force the trajectory of a bistable system from one equilibrium (the initial point) to ... [more ▼]

In many applications, and in systems/synthetic biology in particular, it is desirable to compute control policies that force the trajectory of a bistable system from one equilibrium (the initial point) to another equilibrium (the target point), or in other words to solve the switching problem. It was recently shown that, for monotone bistable systems, this problem admits easyto-implement open-loop solutions in terms of temporal pulses (i.e., step functions of fixed length and fixed magnitude). In this paper, we develop this idea further and formulate a problem of convergence to an equilibrium from an arbitrary initial point. We show that this problem can be solved using a static optimization problem in the case of monotone systems. Changing the initial point to an arbitrary state allows to build closed-loop, event-based or open-loop policies for the switching/convergence problems. In our derivations we exploit the Koopman operator, which offers a linear infinite-dimensional representation of an autonomous nonlinear system. One of the main advantages of using the Koopman operator is the powerful computational tools developed for this framework. Besides the presence of numerical solutions, the switching/convergence problem can also serve as a building block for solving more complicated control problems and can potentially be applied to non-monotone systems. We illustrate this argument on the problem of synchronizing cardiac cells by defibrillation. Potentially, our approach can be extended to problems with different parametrizations of control signals since the only fundamental limitation is the finite time application of the control signal. [less ▲]

Detailed reference viewed: 23 (3 ULiège)
Full Text
See detailDes indices pour la définition de l'état des masses d'eau en milieu marin, mises au point, applications et aide à la gestion
Gobert, Sylvie ULiege; Richir, Jonathan ULiege

in L’eau pour le développement La Gestion Intégrée des Ressources en Eau dans les Pays en développement (2018, February)

Comme les écosystèmes dulçaquicoles, les écosystèmes marins sont soumis à une pression humaine croissante qui altère la qualité de l’eau et les communautés aquatiques. Près de 98 pourcents de l’eau de ... [more ▼]

Comme les écosystèmes dulçaquicoles, les écosystèmes marins sont soumis à une pression humaine croissante qui altère la qualité de l’eau et les communautés aquatiques. Près de 98 pourcents de l’eau de notre planète bleue est contenue dans les océans qui constituent le réceptacle final de tout ce que nous rejetons comme déchets (volontairement ou non). Moins accessible, les océans sont méconnus, souvent oubliés ou négligés et considérés comme une zone inépuisable et où tout se dilue ; actuellement encore 80% des eaux usées sont rejetées en mer sans traitement préalable, à peine 2 % des surfaces marines sont protégées. La Méditerranée est particulière à plus d’un égard, bassin de concentration, de faible surface (1% des océans) abritant pourtant plus de 10% de la biodiversité mondiale. Cette petite mer est un modèle pour les océanographes : en mesurant ce qui s’y passe, nous pouvons prédire ce que se déroulera à court ou moyen terme dans le reste des océans. Le laboratoire d’Océanologie est activement impliqué depuis une quinzaine d’années dans la mise au point d’indice de la qualité des masses d’eau côtières. Ces indices sont construits sur base des connaissances du milieu (variations naturelles), par la mesure des niveaux de contamination et des effets (observation et contamination en mésocosme) de cette pollution sur les communautés. Nous avons développé et validé des indices biologiques (PREI : Posidonia Rapid and Easy Index, ICAR Indice Caulerpa cylindracea ; espèce envahissante), de pollution (TEPI : Trace Element Pollution Index, TESVI : Trace Element Spatial Variation Index), de qualité paysagère (LIMA LIttoral MArin) … Ces indices sont utilisés actuellement dans le cadre de la DCE (Directive Cadre Eau), la DCSMM (Directive Cadre Stratégie pour le Milieu Marin) et dans des réseaux de surveillance en Méditerranée, ils sont un relais et un moyen de communication entre les scientifiques et les politiques, les gestionnaires. L’exportation et l’apprentissage de l’utilisation de ces indices sont un atout pour une gestion globale de l’eau à l’échelle de la Méditerranée. Leurs applications sur l’ensemble de la façade méditerranéenne ont, entre autre, mis en évidence l’impact positif de l’application de directives européennes en matière de gestion des eaux par rapport aux côtes de Nord de l’Afrique. [less ▲]

Detailed reference viewed: 23 (2 ULiège)
Full Text
Peer Reviewed
See detailHeterogeneous incidence and propagation of spreading depolarizations
Kaufmann, D; SCHOENEN, Jean ULiege

in Journal of Cerebral Blood Flow & Metabolism (2018)

Full Text
See detailLes systèmes électoraux de la Belgique. 2e édition
Bouhon, Frédéric ULiege; Reuchamps, Min

Book published by Bruylant (2018)

Il s'agit de la seconde édition d'un ouvrage collectif publié pour la première fois en 2012 qui propose une étude multidisciplinaire des élections en Belgique.

Detailed reference viewed: 46 (3 ULiège)
Full Text
Peer Reviewed
See detailIndependent conditional clauses with argumentative function in Dutch
D’Hertefelt, Sarah; Van linden, An ULiege

in Text & Talk (2018)

This study offers an analysis of independent conditional clauses (ICCs) that are used with argumentative functions in spoken Dutch. ICCs are used as arguments when they serve to motivate the speaker’s ... [more ▼]

This study offers an analysis of independent conditional clauses (ICCs) that are used with argumentative functions in spoken Dutch. ICCs are used as arguments when they serve to motivate the speaker’s implied standpoint regarding a preceding propositional content, termed the trigger. Two basic types of argumentative ICCs can be distinguished, which are termed ‘direct’ and ‘indirect’ arguments. Direct arguments express a contextually given premise on the basis of which a conclusion about the speaker’s standpoint regarding a preceding trigger can be drawn. Indirect arguments, by contrast, express a condition that – if it had held – would have warranted the conclusion, but its counterfactual interpretation resulting from hypothetical backshift signals that the speaker knows that this condition is not fulfilled, and hence that the implied standpoint regarding a trigger is not valid either. We argue that direct and indirect ICCs instantiate independent instances of epistemic non-predictive conditionals and hypothetical predictive conditionals (Dancygier 1993, 1998) respectively, and that they set up propositional-logic arguments of different classic forms, i.e. the modus ponendo ponens form (direct ICCs) and the denying the antecedent form (indirect ICCs). However, they do not explicitly express the conclusion of the argument, as they lack a main clause, but leave it to be inferred by the addressee. [less ▲]

Detailed reference viewed: 23 (0 ULiège)
Full Text
Peer Reviewed
See detailEffects of agricultural land use on fluvial carbon dioxide, methane and nitrous oxide concentrations in a large European river, the Meuse (Belgium)
Borges, Alberto ULiege; Darchambeau, F.; Lambert, T et al

in Science of the Total Environment (2018), 610–611

We report a data-set of CO2, CH4, and N2O concentrations in the surface waters of the Meuse river network in Belgium, obtained during four surveys covering 50 stations (summer 2013 and late winter 2013 ... [more ▼]

We report a data-set of CO2, CH4, and N2O concentrations in the surface waters of the Meuse river network in Belgium, obtained during four surveys covering 50 stations (summer 2013 and late winter 2013, 2014 and 2015), from yearly cycles in four rivers of variable size and catchment land cover, and from 111 groundwater samples. Surface waters of the Meuse river network were over-saturated in CO2, CH4, N2O with respect to atmospheric equilibrium, acting as sources of these greenhouse gases to the atmosphere, although the dissolved gases also showed marked seasonal and spatial variations. Seasonal variations were related to changes in freshwater discharge following the hydrological cycle, with highest concentrations of CO2, CH4, N2O during low water owing to a longer water residence time and lower currents (i.e. lower gas transfer velocities), both contributing to the accumulation of gases in the water column, combined with higher temperatures favourable to microbial processes. Inter-annual differences of discharge also led to differences in CH4 and N2O that were higher in years with prolonged low water periods. Spatial variations were mostly due to differences in land cover over the catchments, with systems dominated by agriculture (croplands and pastures) having higher CO2, CH4, N2O levels than forested systems. This seemed to be related to higher levels of dissolved and particulate organic matter, as well as dissolved inorganic nitrogen in agriculture dominated systems compared to forested ones. Groundwater had very low CH4 concentrations in the shallow and unconfined aquifers (mostly fractured limestones) of the Meuse basin, hence, should not contribute significantly to the high CH4 levels in surface riverine waters. Owing to high dissolved concentrations, groundwater could potentially transfer important quantities of CO2 and N2O to surface waters of the Meuse basin, although this hypothesis remains to be tested. [less ▲]

Detailed reference viewed: 75 (3 ULiège)
Full Text
Peer Reviewed
See detailA fully coupled hydro-mechanical model for the modeling of coalbed methane recovery
Bertrand, François ULiege; Cerfontaine, Benjamin ULiege; Collin, Frédéric ULiege

in Natural Gas science and Engineering (2018)

Most coal seams hold important quantities of methane which is recognized as a valuable energy resource. Coal reservoir is considered not conventional because methane is held adsorbed on the coal surface ... [more ▼]

Most coal seams hold important quantities of methane which is recognized as a valuable energy resource. Coal reservoir is considered not conventional because methane is held adsorbed on the coal surface. Coal is naturally fractured, it is a dual-porosity system made of matrix blocks and cleats (i.e fractures). In general, cleats are initially water saturated with the hydrostatic pressure maintaining the gas adsorbed in the coal matrix. Production of coalbed methane (CBM) first requires the mobilization of water in the cleats to reduce the reservoir pressure. Changes of coal properties during methane production are a critical issue in coalbed methane recovery. Indeed, any change of the cleat network will likely translate into modifications of the reservoir permeability. This work consists in the formulation of a consistent hydro-mechanical model for the CBM production modeling. Due to the particular structure of coal, the model is based on a dual-continuum approach to enrich the macroscale with microscale considerations. Shape factors are employed to take into account the geometry of the matrix blocks in the mass exchange between matrix and fractures. The hydro-mechanical model is fully coupled. For example, it captures the sorption-induced volumetric strain or the dependence of permeability on fracture aperture, which evolves with the stress state. The model is implemented in the finite element code Lagamine and is used for the modeling of one production well. A synthetic reservoir and then a real production case are considered. To date, attention has focused on a series of parametric analyses that can highlight the influence of the production scenario or key parameters related to the reservoir. [less ▲]

Detailed reference viewed: 139 (11 ULiège)