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See detail2D-Vertical Model for Free Surface Incompressible Flows: Validation and Applications
Detrembleur, Sylvain; Dewals, Benjamin ULg; Pirotton, Michel ULg

in Proc. 34th IAHR World Congress - Balance and Uncertainty (2011)

Efficient design of hydraulic structures such as weirs and bottom outlets requires a detailed description of the complex turbulent flows occurring on these structures. Compared to laboratory experiments ... [more ▼]

Efficient design of hydraulic structures such as weirs and bottom outlets requires a detailed description of the complex turbulent flows occurring on these structures. Compared to laboratory experiments, numerical modeling offers more flexibility and cost-effectiveness to test different designs. The non-hydrostatic 2D-vertical model presented here solves the RANS equations for incompressible flows in the vertical plane. It is based on the projection method for pressure-velocity coupling, while free surface tracking is conducted by means of the level set technique and Sussman’s velocity extension algorithm. It enables to predict accurately the flow pattern in the vertical plane and deals with multiple interfaces (jets, drops…). The solver has been validated for both steady and unsteady free surface flows, based on theoretical and experimental data. The paper will detail the application of the model to a pressurized flow and to a sloshing tank. [less ▲]

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See detailUne précision constitutionnelle du domaine d'application de la revalorisation des récompenses? Note sous C.const. 16 septembre 2010
Laruelle, Julie ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2011)

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See detailIntroduction au droit privé
Gerkens, Jean-François ULg

Learning material (2011)

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See detailDensity functional theory beyond the linear regime: Validating an adiabatic local density approximation
Helbig, N.; Fuks, J. I.; Casula, M. et al

in Physical Review. A (2011), 83

We present a local density approximation (LDA) for one-dimensional (1D) systems interacting via the soft-Coulomb interaction based on quantum Monte Carlo calculations. Results for the ground-state ... [more ▼]

We present a local density approximation (LDA) for one-dimensional (1D) systems interacting via the soft-Coulomb interaction based on quantum Monte Carlo calculations. Results for the ground-state energies and ionization potentials of finite 1D systems show excellent agreement with exact calculations obtained by exploiting the mapping of an N-electron system in d dimensions onto a single electron in N×d dimensions, properly symmetrized by the Young diagrams. We conclude that 1D LDA is of the same quality as its three-dimensional (3D) counterpart, and we infer conclusions about 3D LDA. The linear and nonlinear time-dependent responses of 1D model systems using LDA, exact exchange, and the exact solution are investigated and show very good agreement in both cases, except for the well-known problem of missing double excitations. Consequently, the 3D LDA is expected to be of good quality beyond the linear response. In addition, the 1D LDA should prove useful in modeling the interaction of atoms with strong laser fields, where this specific 1D model is often used. [less ▲]

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See detailDie neuinwertsetzung von betriebsbrachen in traditionellen industrieregionen. Ein Vergleich zwischen Lüttich und Sheffield
Guilliams, P.; Halleux, Jean-Marie ULg

in Matznetter, W.; Musil, R. (Eds.) Europa: metropolen in wandel (2011)

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See detailPenser et pratiquer la formation aujourd'hui : mise en perspective des approches psychosociales et ergonomiques de la formation
Faulx, Daniel ULg; Petit, Lucie

in Cahiers Internationaux de Psychologie Sociale (2011), 92(4), 423-444

Faced with new challenges from globalisation, technological changes and demographic change, organisational training take on today a crucial importance in the development of human resources in ... [more ▼]

Faced with new challenges from globalisation, technological changes and demographic change, organisational training take on today a crucial importance in the development of human resources in organisations. This area is at present dominated from both a scientific and practical viewpoint by two major currents: a psychosociological current and an ergonomic current. The contributions of each in organisational human resources development are unquestionable, but we have observed significant levels of misunderstanding between the two, as well as an absence of dialogue and scientific objectivity. The present contribution proposes to initiate this dialogue, with an eye toward developing training practices, and aiding those who seek to train personnel in orienting their choices of training, thanks to a better understanding of both main approaches. From this perspective, based as much on historical research as on more recent work, several points in common are apparent. (1) There is a desire to develop new learning strategies which draws substance from scientific research, and which constitutes a departure from school-based approaches. (2) There is a strong link between theory and action, together with practices that combine practice and knowledge. (3) A vision of learning as the result of action combined with reflection on action. (1) A concentration on groups from psychosociological approaches, as opposed to a concentration on work from ergonomic perspectives. (2) A concentration on functional and specific aspects of work in the ergonomic approach, and emphasis on relational and transversal aspects in the psychosociological approach. (3) Four points concerning which technical exchanges would be profitable. (4) A major controversy on the question of whether the link between work and training is necessary or not. By becoming aware of the complementarity of the two approaches (compatible and different), we become convinced that it is essential to begin a dialogue in order to make organisational training practices more understandable and more effective. [less ▲]

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See detailProper Orthogonal Decomposition for Nonlinear Radiative Heat Transfer Problems
Hickey, D.; Masset, Luc ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the ASME International Design Engineering Technical Conferences (2011)

Analysing large scale, nonlinear, multiphysical, dynamical structures, by using mathematical modelling and simulation, e.g. Finite Element Modelling (FEM), can be computationally very expensive ... [more ▼]

Analysing large scale, nonlinear, multiphysical, dynamical structures, by using mathematical modelling and simulation, e.g. Finite Element Modelling (FEM), can be computationally very expensive, especially if the number of degrees-of-freedom is high. This paper develops modal reduction techniques for such nonlinear multiphysical systems. The paper focuses on Proper Orthogonal Decomposition (POD), a multivariate statistical method that obtains a compact representation of a data set by reducing a large number of interdependent variables to a much smaller number of uncorrelated variables. A fully coupled, thermomechanical model consisting of a multilayered, cantilever beam is described and analysed. This linear benchmark is then extended by adding nonlinear radiative heat exchanges between the beam and an enclosing box. The radiative view factors, present in the equations governing the heat fluxes between beam and box elements, are obtained with a raytracing method. A reduction procedure is proposed for this fully coupled nonlinear, multiphysical, thermomechanical system. Two alternative approaches to the reduction are investigated, a monolithic approach incorporating a scaling factor to the equations, and a partitioned approach that treats the individual physical modes separately. The paper builds on previous work presented previously by the authors. The results are given for the RMS error between either approach and the original, full solution. [less ▲]

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See detailIs there really an Azores diversity enigma? Insights from the phylogeography of the heather Erica scoparia s.l.
Desamore, Aurélie ULg

Poster (2011)

The Azorean flora, in contrast to that of other archipelagos, is characterized by a paucity of evolutionary radiations and the widespread distribution of most endemics. Several hypotheses, including ... [more ▼]

The Azorean flora, in contrast to that of other archipelagos, is characterized by a paucity of evolutionary radiations and the widespread distribution of most endemics. Several hypotheses, including isolation from the continent, recent age, ecological homogeneity, and limited paleoclimatic variations, have been proposed to account for this pattern. These hypotheses are tested here within the context of the molecular phylogeography of the heather Erica scoparia s.l., a Mediterraneo-Atlantic species complex distributed across Macaronesia, North Africa and southwestern Europe. The marked molecular radiation of this species in the Azores, including an array of single-island endemics, suggests that the apparent homogeneity of the Azorean flora might, in fact, conceal undetected patterns of endemism that are similar to those observed in the Canarian flora for morphological data. Haplotype richness was higher in the Azores than in the Canaries and extensive dispersal mediated allopatry is apparent at the molecular level. The Azores were colonized at least twice independently by E. scoparia, whereas the Canarian haplotypes are monophyletic, suggesting that the greater distance between the Azores and the continent does not necessarily hamper the chances of successful colonization. [less ▲]

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See detailCarbon and nitrogen flows during a bloom of the coccolithophore Emiliania huxleyi: Modelling a mesocosm experiment
Joassin, Pascal ULg; Delille, Bruno ULg; Soetaert, Karline et al

in Journal of Marine Systems (2011), 85

A dynamic model has been developed to represent biogeochemical variables and processes observed during experimental blooms of the coccolithophore Emiliania huxleyi induced inmesocosms over a period of 23 ... [more ▼]

A dynamic model has been developed to represent biogeochemical variables and processes observed during experimental blooms of the coccolithophore Emiliania huxleyi induced inmesocosms over a period of 23 days. The model describes carbon (C), nitrogen (N), and phosphorus (P) cycling through E. huxleyi and the microbial loop, and computes pH and the partial pressure of carbon dioxide (pCO2) from dissolved inorganic carbon (DIC) and total alkalinity (TA). The main innovations are: 1) the representation of E. huxleyi dynamics using an unbalanced growthmodel in carbon and nitrogen, 2) the gathering of formulations describing typical processes involved in the export of carbon such as primary production, calcification, cellular dissolved organic carbon (DOC) excretion, transparent exopolymer (TEP) formation and viral lyses, and 3) an original and validated representation of the calcification process as a function of the net primary production with a modulation by the intra-cellular N:C ratio mimicking the effect of nutrients limitation on the onset of calcification. It is shown that this new mathematical formulation of calcification provides a better representation of the dynamics of TA, DIC and calcification rates derived from experimental data compared to classicaly used formulations (e.g. function of biomass or of net primary production without anymodulation term). In a first step, the model has been applied to the simulations of present pCO2 conditions. It adequately reproduces the observations for chemical and biological variables and provides an overall view of carbon and nitrogen dynamics. Carbon and nitrogen budgets are derived from the model for the different phases of the bloom, highlighting three distinct phases, reflecting the evolution of the cellular C:N ratio and the interaction between hosts and viruses. During the first phase, inorganic nutrients are massively consumed by E. huxleyi increasing its biomass. Uptakes of carbon and nitrogen are maintained at a constant ratio. The second phase is triggered by the exhaustion of phosphate (PO4 3−). Uptake of carbon and nitrogen being uncoupled, the cellular C:N ratio of E. huxleyi increases. This stimulates the active release of DOC, acting as precursors for TEP. The third phase is characterised by an enhancement of the phytoplankton mortality due to viral lysis. A huge amount of DOC has been accumulated in the mesocosm. [less ▲]

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See detailInventaire des archives de la Société anonyme d'Ougrée-Marihaye (1835-1955)
Delvaux, Anne-Catherine ULg

Book published by Archives générales du Royaume (2011)

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See detailApport au patrimoine commun et avance sur part de communauté: deux modalités originales. Note sous Liège, 7 septembre 2010
Rousseau, Laura ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2011)

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See detailVariable Neighborhood Search applied to the Vehicle Routing Problem
François, Véronique ULg

Learning material (2011)

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See detail11th Symposium on Fossil Cnidaria and Porifera, Liège, August 19-29, 2011: Abstracts
Aretz, Markus; Delculee, Sandrine; Denayer, Julien ULg et al

Book published by Kölner Forum für Geologie und Paläontologie (2011)

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See detailModélisation numérique de l'expérience SDZ pour l'Andra
Pardoen, Benoît ULg; Charlier, Robert ULg; Radu, Jean-Pol ULg

Report (2011)

An in situ ventilation test (SDZ) is performed by the French national radioactive waste management agency (ANDRA) in the Meuse/Haute-Marne underground research laboratory. The aim is to characterise the ... [more ▼]

An in situ ventilation test (SDZ) is performed by the French national radioactive waste management agency (ANDRA) in the Meuse/Haute-Marne underground research laboratory. The aim is to characterise the effect of the desaturation and possible resaturation of the damaged zone located around an experimental gallery due to controlled ventilation imposed in this gallery. Hydro and hydro-mechanical numerical modellings are realised in order to acquire a better understanding of clayey rock behaviour and transfers occurring during the test. [less ▲]

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See detailCommission on New Minerals, Nomenclature and Classification (CNMNC), Newsletter 10
Williams; Hatert, Frédéric ULg; Pasero, Marco et al

in Mineralogical Magazine (2011), 75(5), 2549-2561

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See detailDie Narrenburg im Waldwinkel. Theodor Storms Auseinandersetzung mit Adalbert Stifter
Leyh, Valérie ULg

in Sprachkunst. Beiträge zur Literaturwissenschaft (2011), 42(1), 1-28

Comme l'ont déjà évoqué plusieurs chercheurs, la nouvelle "Waldwinkel" (1874) de Theodor Storm montre de nombreuses correspondances avec le récit "Die Narrenburg" (1842) d'Adalbert Stifter. Or jusqu'à ... [more ▼]

Comme l'ont déjà évoqué plusieurs chercheurs, la nouvelle "Waldwinkel" (1874) de Theodor Storm montre de nombreuses correspondances avec le récit "Die Narrenburg" (1842) d'Adalbert Stifter. Or jusqu'à présent, ce rapport étroit entre ces deux textes narratifs n'a pas encore été étudié en profondeur. Cet article vise dès lors à analyser les continuités et discontinuités entre ces deux récits. Une étude minutieuse des stratégies narratives ainsi qu'une analyse comparative des personnages principaux permettent de constater que la nouvelle de Storm fait, certes, renaître le monde de Stifter, mais pour le faire apparaître comme un non-lieu, une utopie. La noblesse, qui chez Stifter parvient encore à se renouveler en s'alliant à la bourgeoisie, est ainsi, chez Storm, vouée au déclin. Le monde représenté dans "Waldwinkel" est, quant à lui, marqué par la réalité du capitalisme et du combat de tous contre tous. [less ▲]

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See detailRate of Malignancies and Infections in a Large Single Center Cohort of IBD Patients Treated With Thiopurines and Anti-TNF-Antibodies.
Ochsenkühn, T; Steinborn, A; Beigel, F et al

in Journal of Crohn’s and Colitis (2011)

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