References of "2012"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailToward a High Order Throughflow - Investigation of the Nonlinear Harmonic Method Coupled With an Immersed Boundary Method for the Modeling of the Circumferential Stresses
Thomas, Jean-Philippe ULg; Léonard, Olivier ULg

in Journal of Turbomachinery (2012), 134(1),

Capturing a level of modeling of the flow inside a multi-stage turbomachine, such as unsteadiness for example, can be done at different degrees of details, either by capturing all deterministic features ... [more ▼]

Capturing a level of modeling of the flow inside a multi-stage turbomachine, such as unsteadiness for example, can be done at different degrees of details, either by capturing all deterministic features of the flow with a pure unsteady method or by settling for an approximated solution at a lower computational cost. The harmonic methods stand in this second category. Amongst them the "Nonlinear Harmonic Method'' from He revealed the most efficient. This method consists of solving the fully nonlinear 3D steady problem and a linearized perturbation system in the frequency domain. As it has been shown by the authors that the circumferential variations exhibit a harmonic behavior, it is proposed here to adapt this method to the throughflow model, where the main nonlinear system would be the common throughflow equations and the auxiliary system would give access to the circumferential stresses. As the numerical local explicit impermeability conditions are unsupported by Fourier series, the adaptation of this technique to the throughflow model passes through a reformulation of the blade effect by a smooth force field as in the "Immersed Boundary Method'' from Peskin. A simple example of an inviscid flow around a cylinder will illustrate the preceding developments, bringing back the mean effect of the circumferential non uniformities into the meridional flow. [less ▲]

Detailed reference viewed: 85 (8 ULg)
Full Text
Peer Reviewed
See detailSecteur Régulé : La Commission européenne condamne l’opérateur historique polonais de télécommunications pour avoir abusé de sa position dominante en entravant l’accès de nouveaux entrants au marché de l’Internet
Sibony, Anne-Lise ULg; Marty, Frédéric

in Concurrences : Revue des Droits de la Concurrence (2012), 1-2012

Comm. eur., 22 juin 2011, Telekomunikacja Polska, aff. COMP/39525 La Commission européenne condamne l’opérateur historique polonais de télécommunications pour avoir abusé de sa position dominante en ... [more ▼]

Comm. eur., 22 juin 2011, Telekomunikacja Polska, aff. COMP/39525 La Commission européenne condamne l’opérateur historique polonais de télécommunications pour avoir abusé de sa position dominante en entravant l’accès de nouveaux entrants au marché de l’Internet. [less ▲]

Detailed reference viewed: 52 (5 ULg)
Full Text
Peer Reviewed
See detailLes PCB non apparentés aux dioxines (non dioxin-like PCB) dans les denrées alimentaires et les aliments pour animaux: mise en place d'une législation européenne
Eppe, Gauthier ULg

Article for general public (2012)

La famille des PolyChloroBiphényles ou PCB regroupe un ensemble de 209 composés différents (dénommés usuellement congénères) se différenciant par le nombre (1 à 10 atomes) et la position des atomes de ... [more ▼]

La famille des PolyChloroBiphényles ou PCB regroupe un ensemble de 209 composés différents (dénommés usuellement congénères) se différenciant par le nombre (1 à 10 atomes) et la position des atomes de chlore sur la molécule biphényle. Cette famille de composés peut être divisée en deux catégories selon leurs propriétés toxicologiques, et plus particulièrement les effets tératogènes des PCB. Le premier groupe, composé de 12 congénères, se caractérise par des propriétés toxicologiques similaires aux dioxines, et il est par conséquent désigné par le terme ‘PCB de type dioxine’ (dioxin-like PCB, DL-PCB). L’autre groupe de PCB non apparenté aux dioxines (non dioxin-like PCB, NDL-PCB), présente d’autres mécanismes de toxicité pris en compte dans la gestion du risque PCB. Parmi ces 197 NDL-PCB, une sous-catégorie de six congénères relativement abondants dans l’environnement et dans les chaînes alimentaires (PCB 28, 52, 101, 138, 153 et 180), représente ce que nous appelons communément les PCB indicateurs. De par leurs propriétés de persistance, de bioaccumulation et de biomagnification, l’ensemble des PCB (DL-PCB et NDL-PCB) se retrouve fréquemment dans l’alimentation humaine et dans les aliments pour animaux. La fixation de teneurs maximales en NDL-PCB dans divers aliments fait l’objet d’une nouvelle réglementation européenne qui entrera en vigueur dès 2012. Cet article fait le point sur l’impact de ces nouvelles propositions par rapport au niveau de bruit de fond des principales classes d’aliments mais également sur l’évolution des méthodes d’analyse nécessaires pour atteindre les performances requises. [less ▲]

Detailed reference viewed: 83 (16 ULg)
Full Text
See detailla méthode conductive selon Petho
Battisti, Oreste ULg

Learning material (2012)

introduction et illustration par un film de la méthode conductive selon Petho, avec le film "je veux le faire tout seul"

Detailed reference viewed: 104 (5 ULg)
See detailAnalysis of synthetic canine training aids GCxGC-TOFMS
Stadler; Forbes; Focant, Jean-François ULg

Conference (2012, January)

Detailed reference viewed: 11 (1 ULg)
Full Text
See detailContribution à la résolution de la conjecture S-adique
Leroy, Julien ULg

Doctoral thesis (2012)

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailStudy of 2-Ethanolamine degradation
Léonard, Grégoire ULg; Toye, Dominique ULg; Heyen, Georges ULg

Conference (2012, January)

One major drawback of the post-combustion CO2 capture using conventional amine solvents is solvent degradation, which can be due to thermal as well as oxidative mechanisms. Degradation affects the CO2 ... [more ▼]

One major drawback of the post-combustion CO2 capture using conventional amine solvents is solvent degradation, which can be due to thermal as well as oxidative mechanisms. Degradation affects the CO2 capture process since it may cause corrosion, foaming and fouling, possibly inducing a decrease of the solvent efficiency and high additional operating costs due to solvent replacement. In order to study degradation of conventional amine solvents as well as degradation of novel solvents, a degradation test rig has been built at the University of Liège in collaboration with the company Laborelec, member of the GDF SUEZ group. Since degradation generally occurs within a few months in real plant conditions, this equipment has been designed to allow the study of different degradation mechanisms under accelerated conditions, at high temperatures (up to 140°C) and high partial pressures in oxygen and CO2 (total pressure up to 20 bar with varying gas composition). An advantage of this degradation test rig is that it can be used in batch as well as in semi-batch mode with constant gas flow. High gas-liquid contact efficiency is also ensured thanks to a mechanical agitation system combined with gas bubbling. For a typical run, 300g of aqueous amine solution (30 wt % MEA in water) is introduced into the reactor and degraded during two weeks. The degraded solutions are then analysed using high pressure liquid chromatography (HPLC) for MEA quantification and gas chromatography with flame ionization detector (GC-FID) for the characterization of degradation products. The gas phase is analysed by Fourier Transform Infra Red spectroscopy. The final objective of this work is to implement the data obtained from experimental results on the degradation test rig into an existing simulation model that has been developed based on an existing pilot plant. [less ▲]

Detailed reference viewed: 217 (1 ULg)
See detailHeisenberg-limited metrology without entanglement
Braun, Daniel; Martin, John ULg

Conference (2012, January)

Detailed reference viewed: 14 (2 ULg)
Full Text
See detailUnsteady Navier-Stokes simulation of low-Reynolds stall flutter
Yabili, Sacha ULg; Smith, Marilyn; Dimitriadis, Grigorios ULg

in Proceedings of the 50th AIAA Aerospace Sciences Meeting (2012, January)

A solver has been developed within the OpenFoam framework to compute large amplitude motion of two-dimensional rigid configurations. The results obtained with this code were successfully validated on ... [more ▼]

A solver has been developed within the OpenFoam framework to compute large amplitude motion of two-dimensional rigid configurations. The results obtained with this code were successfully validated on rigid airfoils at static and dynamic conditions, as well as correlated with experimental data and numerical solutions from similar unsteady solvers. The results demonstrate that current computational methods are, within the constraints imposed by spatial grids, temporal integration and turbulence modeling, capable of capturing the self-sustained oscillations characterizing stall flutter event with reasonable accuracy, including the mechanisms of energy transfer. [less ▲]

Detailed reference viewed: 83 (13 ULg)
Full Text
Peer Reviewed
See detailLife-cycle assessment of residential buildings in three different European locations, basic tool
Rossi, Barbara ULg; Marique, Anne-Françoise ULg; Glaumann, Mauritz et al

in Building & Environment (2012), 51

The paper deals with the development of a tool used for the life cycle assessment of residential buildings located in three different European towns: Brussels (Belgium), Coimbra (Portugal) and Luleå ... [more ▼]

The paper deals with the development of a tool used for the life cycle assessment of residential buildings located in three different European towns: Brussels (Belgium), Coimbra (Portugal) and Luleå (Sweden). The basic tool focuses on the structure and the materials of the buildings and permits the evaluation of the Embodied energy, Embodied carbon and yearly energy consumption. For that purpose, a different set of original data is taken into account for each location, in which the monthly temperatures, energy mix, heating and cooling systems are defined. The energy consumption, being for heating space or water, for cooling or for lighting is transformed into CO2 emissions to deduce the Operational carbon as well. The influence of the energy mix can therefore be assessed in the basic tool. As a matter of fact, the heating and cooling systems habitually used in the three countries are also of great importance. The District Heating system, is, for instance, incorporated in the basic tool. The presence of solar water heater or photovoltaic panels is also strongly influencing the operational carbon. After a short literature review on building LCA and the description of the basic tool, the software Pleiades+Comfie combined with Equer is used to achieve the complete LCA for one building using two different load bearing frames. The results of the calculations for Brussels climate are verified against these software results. The dependence of the results to parameters such as climate, energy mix and habits is then discussed in the companion paper. [less ▲]

Detailed reference viewed: 128 (47 ULg)
Full Text
See detailLife in the cold: proteomics of the Antarctic bacterium Pseudoalteromonas haloplanktis
Piette, Florence ULg; Struvay, Caroline ULg; Godin, Amandine ULg et al

in Heazlewood, J. L.; Petzold, C. J. (Eds.) Proteomic Applications in Biology (2012)

Detailed reference viewed: 77 (35 ULg)
Full Text
Peer Reviewed
See detailHBV infection in Belgium: results of the BASL observatory of 1456 HBsAg carriers.
Deltenre, P.; Laleman, W.; Van Gossum, M. et al

in Acta Gastro-Enterologica Belgica (2012), 75(1), 35-41

Introduction : Nationwide studies are mandatory to assess changes in the epidemiology of HBV infection in Europe. Aim : To describe epidemiological characteristics of HBsAgpositive patients, especially ... [more ▼]

Introduction : Nationwide studies are mandatory to assess changes in the epidemiology of HBV infection in Europe. Aim : To describe epidemiological characteristics of HBsAgpositive patients, especially inactive carriers, and to evaluate how practitioners manage HBV patients in real life. Methods : Belgian physicians were asked to report all chronically infected HBV patients during a one-year period. Results : Among 1,456 patients included, 1,035 (71%) were classified into one of four phases of chronic infection : immune tolerance (n = 10), HBeAg-positive hepatitis (n = 248), HBeAgnegative hepatitis (n = 420) and inactive carrier state (n = 357 HBeAg-negative patients with ALT < upper limit of normal (ULN) and HBV DNA < 2,000 IU/mL). Using less restrictive criteria for ALT (1-2 ULN) or HBV DNA (2,000-20,000 IU/mL), 93 unclassified patients were added to the group of inactive carriers. These 93 additional inactive carriers were younger, more frequently males, with similar risk factors for HBV infection and histological features compared to inactive carriers according to recent guidelines. Recent guidelines on management of HBV patients were generally followed, but systematic HBV DNA measurements and HDV coinfection screening should be reinforced. Conclusion : In Belgium, an inactive carrier state was a common form of chronic HBV infection. Using less restrictive criteria for classification of inactive carriers did not modify their main characteristics and seemed better adapted to clinical practice. Recent guidelines on management of HBV patients should be reinforced. [less ▲]

Detailed reference viewed: 30 (3 ULg)
Full Text
Peer Reviewed
See detailReconstruction of a human mitochondrial complex I mutation in the unicellular green alga Chlamydomonas.
Larosa, Véronique ULg; Coosemans, Nadine ULg; Motte, Patrick ULg et al

in Plant Journal (The) (2012), 70

Defects in complex I (NADH:ubiquinone oxidoreductase) are the most frequent cause of human respiratory disorders. The pathogenicity of a given human mitochondrial mutation can be difficult to demonstrate ... [more ▼]

Defects in complex I (NADH:ubiquinone oxidoreductase) are the most frequent cause of human respiratory disorders. The pathogenicity of a given human mitochondrial mutation can be difficult to demonstrate because the mitochondrial genome harbors large numbers of polymorphic base changes that have no pathogenic significance. In addition, mitochondrial mutations are usually found in the heteroplasmic state, which could hide the biochemical effect of the mutation. We propose that the unicellular green alga Chlamydomonas could be used to study such mutations because (1) respiratory-deficient mutants are viable and mitochondrial mutations are found in the homoplasmic state, (2) transformation of the mitochondrial genome is feasible, (3) Chlamydomonas complex I is close to that of humans. To illustrate that, we have introduced a Leu157Pro substitution in the Chlamydomonas ND4 subunit of complex I of two different recipient strains by biolistic transformation, demonstrating that site-directed mutagenesis of the Chlamydomonas mitochondrial genome is possible. This substitution did not lead to any respiratory enzyme defect when it is present in the heteroplasmic state in a patient presenting chronic progressive external ophthalmoplegia. When present in the homoplasmic state in the alga, the mutation does not prevent the assembly of the 950 kDa whole complex I which conserves nearly all the NADH dehydrogenase activity of the peripheral arm. However, the NADH:duroquinone oxidoreductase activity is strongly reduced, suggesting that the substitution could affect ubiquinone fixation to the membrane domain. The in vitro defects are correlated in vivo with a decrease in dark respiration and growth rate. [less ▲]

Detailed reference viewed: 52 (8 ULg)
Full Text
Peer Reviewed
See detailSpatial correlation of OH Meinel and O2 Infrared Atmospheric nightglow emissions observed with VIRTIS-M on board Venus Express
Gérard, Jean-Claude ULg; Soret, Lauriane ULg; Piccioni, G. et al

in Icarus (2012)

We present the two-dimensional distribution of the O2 a1∆-X3Σ (0-0) band at 1.27 µm and the OH ∆v=1 Meinel airglow measured simultaneously with the Visible and Infrared Thermal Imaging Spectrometer ... [more ▼]

We present the two-dimensional distribution of the O2 a1∆-X3Σ (0-0) band at 1.27 µm and the OH ∆v=1 Meinel airglow measured simultaneously with the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on board Venus Express. We show that the two emissions present very similar spatial structures. A cross-correlation analysis indicates that the highest level of correlation is reached with only very small relative shifts of the pairs of images. In spite of the strong spatial correlation between the morphology of the bright spots in the two emissions, we also show that their relative intensity is not constant, in agreement with earlier statistical studies of their limb profiles. We conclude that the two emissions have a common precursor that controls the production of both excited species. We argue that atomic oxygen, which produces O2(1∆) molecules by three-body recombination and is the precursor of ozone formation, also governs to a large extent the OH airglow morphology through the H + O3 → OH* + O2 reaction. [less ▲]

Detailed reference viewed: 35 (8 ULg)
Full Text
Peer Reviewed
See detailNeuropathie ulnaire au coude : étude combinée des muscles abductor digiti minimi et interosseus I
WANG, François-Charles ULg

in Lettre du Neurologue (La) : le Courrier du Spécialiste (2012), XVI(1), 33

Detailed reference viewed: 30 (2 ULg)
Full Text
See detailSystemisch-entzuendliche Reaktion beim Hochleistungssportpferd
Sandersen, Charlotte ULg; Lejeune, Jean-Philippe ULg; Votion, Dominique ULg et al

Book published by Leipziger Blaue Hefte (2012)

Detailed reference viewed: 32 (7 ULg)
Full Text
See detailPlurilinguismes à la Renaissance italienne
Moreno, Paola ULg

in Culture, le Magazine Culturel de l'Université de Liège (2012)

Detailed reference viewed: 16 (9 ULg)
Full Text
See detailMadeleine Bourdouxhe, la pudeur et l'ellipse
Demoulin, Laurent ULg

in Kovacshazy, Cécile (Ed.) Relire Madeleine Bourdouxhe. Regards croisés sur son oeuvre littéraire (2012)

La modernité de Madeleine Bourdouxhe passe par des figures de la narration, comme la métalipse et ce que l'on se propose d'appeler ici "figure Stendhal" et "figure Flaubert".

Detailed reference viewed: 43 (0 ULg)
See detailPersonality modulation of (un)conscious processing: Novelty seeking and performance following supraliminal and subliminal reward cues
Bustin, Gaëlle ULg; Quoidbach, Jordi; Hansenne, Michel ULg et al

Poster (2012, January)

This study provides evidence that personality traits associated with responsiveness to conscious reward cues also influence responsiveness to unconscious reward cues. Participants with low and high levels ... [more ▼]

This study provides evidence that personality traits associated with responsiveness to conscious reward cues also influence responsiveness to unconscious reward cues. Participants with low and high levels of Novelty Seeking (NS) performed updating tasks in which they could either gain 1 euro or 5 cents. Gains were presented either supraliminally or subliminally at the beginning of each trial. Results showed that low NS participants performed better in the high-reward than in the low-reward condition, whereas high NS participants’ performance did not differ between reward conditions. Interestingly, we found that low NS participants performed significantly better when rewards were presented unconsciously, whereas high NS participants’ performance did not differ whether reward cues were presented subliminally or supraliminally. Our findings highlight the necessity to take personality into account in unconscious cognition research. They also suggest that whether implicit and explicit motives have similar or complementary influences might be determined by individual differences. [less ▲]

Detailed reference viewed: 64 (13 ULg)