Publications ORBi OA
Bookmark and Share    
Full Text
Peer Reviewed
See detailA new discontinuous Galerkin method for Kirchhoff-Love shells
Noels, Ludovic ULg; Radovitzky, Raúl

in Computer Methods in Applied Mechanics & Engineering (2008), 197

Discontinuous Galerkin methods (DG) have particular appeal in problems involving high-order derivatives since they provide a means of weakly enforcing the continuity of the unknown-field derivatives. This ... [more ▼]

Discontinuous Galerkin methods (DG) have particular appeal in problems involving high-order derivatives since they provide a means of weakly enforcing the continuity of the unknown-field derivatives. This paper proposes a new discontinuous Galerkin method for Kirchhoff–Love shells considering only the membrane and bending response. The proposed one-field method utilizes the weak enforcement in such a way that the displacements are the only unknowns, while the rotation continuity is weakly enforced. This work presents the formulation of the new discontinuous Galerkin method for linear elastic shells, demonstrates the consistency and stability of the proposed framework, and establishes the method’s convergence rate. After a description of the formulation implementation into a finite-element code, these properties are demonstrated on numerical applications. [less ▲]

Detailed reference viewed: 148 (18 ULg)
Full Text
Peer Reviewed
See detailComment je traite ... en optimisant le blocage du système rénine-angiotensine-aldostérone
SCHLEICH, FLorence ULg; Krzesinski, Jean-Marie ULg; Pierard, Luc ULg et al

in Revue Médicale de Liège (2008), 63

The blockade of the renin-angiotensin-aldosterone system (RAAS) has been shown to be useful, or even mandatory, in the management of arterial hypertension, congestive heart failure, post-myocardial ... [more ▼]

The blockade of the renin-angiotensin-aldosterone system (RAAS) has been shown to be useful, or even mandatory, in the management of arterial hypertension, congestive heart failure, post-myocardial infarction and nephropathy with albuminuria, due to diabetes or not. Such blockade can be obtained with an angiotensin converting enzyme inhibitor, a specific antagonist of angiotensin II AT1 receptors and/or recently a direct inhibitor of renin such as aliskiren. Various studies have demonstrated the advantage of optimising RAAS blockade in order to benefit of the best cardiorenal protection. The present article describes the various modalities to optimize the RAAS blockade, either by using a maximal dosage of a monotherapy, or by choosing a double inhibition of RAAS. New prospects for the RAAS blockade will be also briefly considered. [less ▲]

Detailed reference viewed: 230 (6 ULg)
Full Text
Peer Reviewed
See detailTechniques and applications for predictive metallurgy and ore
Lane, Geoff; Martin, Chris; Pirard, Eric ULg

in Minerals Engineering (2008), 21

Detailed reference viewed: 65 (7 ULg)
Full Text
Peer Reviewed
See detailHypertension artérielle et cerveau
Milicevic, Martina; Krzesinski, Jean-Marie ULg

in Revue Médicale de Liège (2008), 63(5-6), 269-279

The relationships between the brain and arterial hypertension are strong. The brain, through the hypothalamus, can quickly adapt the blood pressure level to maintain the cerebral blood flow. An acute ... [more ▼]

The relationships between the brain and arterial hypertension are strong. The brain, through the hypothalamus, can quickly adapt the blood pressure level to maintain the cerebral blood flow. An acute increase in blood pressure, if it overtakes the autoregulatory capacities, needs an urgent intervention to decrease neurological problems such as encephalopathy. In chronic situations, arterial hypertension is a frequent cause of stroke, either ischemic or hemorragic, both in patients free and those who have already suffered from brain damage. Hypertension is also an actor in the genesis of vascular, but also Alzheimer dementia. A strict control of blood pressure (but also in other atherosclerotic risk factors) into the normal range is needed to protect the brain, and this is more important than the choice of a particular class of antihypertensive agents, except the betablockers. The risk starts from the normal values of blood pressure. [less ▲]

Detailed reference viewed: 210 (6 ULg)
Full Text
Peer Reviewed
See detailAntibiotiques et patient dialysé: trois cas de toxicité neurologique du céfépime
Parotte, Marie-Christine ULg; Krzesinski, Jean-Marie ULg

in Revue Médicale de Liège (2008), 63

The metabolism of drugs is altered in dialysed patients. We report three clinical cases of neurological toxicity from cefepime in dialysed patient. This molecule can induce in renal insufficiency patients ... [more ▼]

The metabolism of drugs is altered in dialysed patients. We report three clinical cases of neurological toxicity from cefepime in dialysed patient. This molecule can induce in renal insufficiency patients various reversible neurological manifestations like metabolic encephalopathy, myoclonies, or a state of status epilepticus tha mimics sometimes a coma in spite of adequate dosing. [less ▲]

Detailed reference viewed: 193 (4 ULg)
Full Text
Peer Reviewed
See detailRecognition of homopyrimidine mismatches by distance-constrained macrocyclic bisintercalators
Bahr, Matthias; Gabelica, Valérie ULg; Granzhan, Anton et al

in Nucleic Acids Symposium Series (2008), 52

Binding of three macrocyclic bisintercalators to mismatch-containing duplexes was analyzed by thermal denaturation experiments, electrospray mass spectrometry studies (ESI-MS) and fluorescent intercalator ... [more ▼]

Binding of three macrocyclic bisintercalators to mismatch-containing duplexes was analyzed by thermal denaturation experiments, electrospray mass spectrometry studies (ESI-MS) and fluorescent intercalator displacement (FID) titrations. The macrocyclic bisintercalators bind to duplexes containing mismatched thymine bases with high selectivity over the fully matched one and affinity in the submicromolar range (Kd). The FID results also demonstrate that the macrocyclic naphthalene derivative BisNP preferentially binds to pyrimidine-pyrimidine mismatches compared to all other possible base mismatches. This ligand also efficiently competes with a DNA enzyme (M.TaqI) for binding to a duplex with a TT-mismatch [less ▲]

Detailed reference viewed: 27 (0 ULg)
Full Text
Peer Reviewed
See detailQuand doit-on réséquer les métastases hépatiques d'un cancer colorectal?
Honoré, Charles ULg; Detry, Olivier ULg; Deroover, Arnaud ULg et al

in Revue Médicale de Liège (2008), 63(10), 595-599

6000 new cases of colorectal cancer are diagnosed each year in Belgium. 50% of these patients shall develop liver metastasis. Resection remains the only chance of long term survival and must be considered ... [more ▼]

6000 new cases of colorectal cancer are diagnosed each year in Belgium. 50% of these patients shall develop liver metastasis. Resection remains the only chance of long term survival and must be considered as an endpoint from the beginning of the treatment. It is the result of a multidisciplinary discussion and a global approach of the disease. It is rarely directly feasible, but there are many techniques which may make it achievable in the end. Today, resection criteria are exclusively technical and neitherbad prognosis factors, nor the presence of extra-hepatic metastases should exclude liver resection. This resecability must be assessed by a confirmed hepatobiliary surgeon and must be proposed to all patients whatever their age as long as their global status is good. [less ▲]

Detailed reference viewed: 137 (9 ULg)
Full Text
See detailLes ruptures du quotidien sonore : une stratégie de pouvoir ? L’exemple liégeois dans la première moitié du XVIIe siècle
Corswarem, Emilie ULg; Delfosse, Annick ULg

in Gauthier, Laure; Traversier, Mélanie (Eds.) Mélodies urbaines. La musique dans les villes d’Europe (XVIe-XIXe s.) (2008)

The authors examine the possible links between a sound mobilisation in some urban places and the promotion of powers that are associated with these places (Palace, Town Hall, Cathedral…). They test their ... [more ▼]

The authors examine the possible links between a sound mobilisation in some urban places and the promotion of powers that are associated with these places (Palace, Town Hall, Cathedral…). They test their hypothesis in the frame of Liege where different powers live together – and often are faced: they try then to understand if the deliberate invitation of the music, the sound and the noise, integrated in a large spectacular system tied to specific places, contributes to assert the vitality of one or the other power. The historian and the musicologist want to know if the “noise” must to be foreseen as a tool in the hands of these authorities: the Bavarian prince-bishop who defends his sovereign interests, the Cathedral Chapter that wants to demonstrate his power or the local Magistrate increasingly opposed to his prince. [less ▲]

Detailed reference viewed: 229 (69 ULg)
Full Text
Peer Reviewed
See detailStudy of bendability of steel sheets
Ben Bettaieb, Mohamed ULg; Lemoine, Xavier; Duchene, Laurent ULg et al

in Steel Research International (2008), (79/1), 225-232

In the present contribution bending tests are modeled and the bendability of steel sheets is evaluated. Bendability refers to the ratio of the minimum bend radius to the initial sheet thickness at which ... [more ▼]

In the present contribution bending tests are modeled and the bendability of steel sheets is evaluated. Bendability refers to the ratio of the minimum bend radius to the initial sheet thickness at which the bending proc-ess is successfully accomplished [1]. The metallurgic microstructure of the studied sheet consists in two principal phases: a fully dense matrix (which may be itself composed by several metallurgic phases) and spherical voids. For that purpose, the Gurson Tvergaard Needleman law ([2], [3], [4]) is used and significantly modified. The behavior of the fully dense matrix is de-fined by the anisotropic Hill 48 function and the Swift hardening law. The width of the sheet is assumed to be large enough to neglect the transversal strains and the stress component in the thickness direction is also neglected. The bending operation can thus be modelled by a plane strain-plane stress loading. The influence of mechanical pa-rameters such as the initial porosity, the Lankford coefficient and the strain harden-ing exponent on the bendability is studied herein. The failure here is defined by the onset coalescence of neighbour voids and is checked by using Thomason [5], Pardoen [6] and Brunet [7] coalescence models. So the influence of other phenomena (like the shear band development and the localized necking) on the bendability is neglected here. [less ▲]

Detailed reference viewed: 402 (37 ULg)
Full Text
Peer Reviewed
See detailThe Numerical Modeling and Measurement of Demagnetization Effect in Bulk YBCO Superconductors Subjected to Transverse Field
Hong, Z.; Vanderbemden, Philippe ULg; Pei, R. et al

in IEEE Transactions on Applied Superconductivity (2008), 18(2), 1561-1564

In this paper, the crossed field demagnetization effect of the bulk type-II superconducting materials in a variety of external magnetic field condition has been investigated both numerically and ... [more ▼]

In this paper, the crossed field demagnetization effect of the bulk type-II superconducting materials in a variety of external magnetic field condition has been investigated both numerically and experimentally. A melt-textured YBCO bulk sample was magnetized along the axial direction and after that a transverse field perpendicular to the central axis applied. The collapse of the original trapped field was measured using a Quantum Design Physical Property Measurement System. A numerical solver based on critical state model is proposed to simulate the measured results. (C) 2008 IEEE. [less ▲]

Detailed reference viewed: 70 (33 ULg)
Full Text
Peer Reviewed
See detailCritical opalescence points to thermodynamic instability:relevance to small-angle X-ray scattering of resorcinol–formaldehyde gel formation at low pH
Gommes, Cédric ULg; Job, Nathalie ULg; Pirard, Jean-Paul ULg et al

in Journal of Applied Crystallography (2008), 41(4), 663-668

During the formation at low pH of resorcinol–formaldehyde gels with a structure in the micrometre range, small-angle X-ray scattering exhibits a nonmonotonic intensity variation as a function of reaction ... [more ▼]

During the formation at low pH of resorcinol–formaldehyde gels with a structure in the micrometre range, small-angle X-ray scattering exhibits a nonmonotonic intensity variation as a function of reaction time. The data are analyzed in terms of scattering by statistical fluctuations of polymer concentration, the amplitude of which is maximal close to the critical point for phase separation between polymer and solvent. The data do not carry any morphological information, but they unambiguously show that the driving force of the gel formation is a thermodynamic instability of the polymerizing solution. [less ▲]

Detailed reference viewed: 74 (17 ULg)
Full Text
Peer Reviewed
See detailDiet and foraging ecology of Roseate terns and lesser noddies breeding sympatrically on Aride Island, Seychelles
Monticelli, David; Ramos, J. A.; Tavares, P. C. et al

in Waterbirds (2008), 31(239), 248

Inferences on seabird ecology from stable isotopes ratios (δ13C, δ15N) and mercury concentrations analysis of feathers have been made for temperate and polar species but are far more rare for tropical ... [more ▼]

Inferences on seabird ecology from stable isotopes ratios (δ13C, δ15N) and mercury concentrations analysis of feathers have been made for temperate and polar species but are far more rare for tropical species. In this paper, we used this approach combined with analysis of regurgitations and feeding observations at colonies to examine diet segregation between Roseate Terns (Sterna dougallii) and Lesser Noddies (Anous tenuirostris) breeding sympatrically on Aride Island (Seychelles), western Indian Ocean. Our results indicated extensive overlap between the two species in trophic level and foraging area during the breeding season. Goatfish predominated (93-97%) in all diet samples of adults and chicks collected in the colonies, except in prey fed to mates by Roseate Terns, of which scad and tuna comprised 20%. The isotopic analyses of feathers replaced by adults during molt (primary and body feathers) suggested, however, that the two species differ in foraging ecology during the nonbreeding period. Roseate Tern adults had consistently lower δ15N values than Lesser Noddies which, in turn, had δ15N values comparable to those of chick feathers grown on Aride. Moreover, low but similar mercury levels were found in body feathers of Lesser Noddy adults and Roseate Tern chicks, whereas Roseate Tern adults were significantly more contaminated. Overall, these results support the hypothesis that the Lesser Noddy is largely sedentary, being associated with the same food web in the vicinity of the colonies year-round. In contrast, Roseate Terns rely on distinct prey during the molting (nonbreeding) season which may be also consistent with a change in food web (i.e., a migratory regime) although the assignment of potential wintering areas remain difficult without isotopic basemaps currently available for the Indian Ocean. [less ▲]

Detailed reference viewed: 150 (6 ULg)
Full Text
See detailLe juge constitutionnel et la fiscalité négociée : le maintien des effets d'une norme annulée, applicable une seule fois
Bouhon, Frédéric ULg

in Revue de la Faculté de Droit de l'Université de Liège (2008), 4

Detailed reference viewed: 82 (17 ULg)
Full Text
Peer Reviewed
See detailUndetected changes in visible stimuli influence subsequent decisions.
Laloyaux, Cédric ULg; Devue, Christel ULg; Doyen, Stéphane et al

in Consciousness & Cognition (2008), 17(3), 646-56

Change blindness-our inability to detect changes in a stimulus-occurs even when the change takes place gradually, without any disruption [Simons, D. J., Franconeri, S. L., & Reimer, R. L. (2000). Change ... [more ▼]

Change blindness-our inability to detect changes in a stimulus-occurs even when the change takes place gradually, without any disruption [Simons, D. J., Franconeri, S. L., & Reimer, R. L. (2000). Change blindness in the absence of a visual disruption. Perception, 29(10), 1143-1154]. Such gradual changes are more difficult to detect than changes that involve a disruption. Using this method, David et al. [David, E., Laloyaux, C., Devue, C., & Cleeremans, A. (in press). Change blindness to gradual changes in facial expressions. Psychologica Belgica] recently showed substantial blindness to changes that involve facial expressions of emotion. In this experiment, we show that people who failed to detect any change in the displays were (1) nevertheless influenced by the changing information in subsequent recognition decisions about which facial expression they had seen, and (2) that their confidence in their decisions was lower after exposure to changing vs. static displays. The findings therefore support the notion that undetected changes that occur in highly salient stimuli may be causally efficacious and influence subsequent behavior. Implications concerning the nature of the representations associated with undetected changes are discussed. [less ▲]

Detailed reference viewed: 47 (3 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of a Scroll Expander for Use in a Rankine Cycle
Lemort, Vincent ULg; Quoilin, Sylvain ULg; Lebrun, Jean ULg

(2008)

This paper presents two simulation models of scroll expanders for use in heat recovery Rankine cycle applications: a detailed reference model and a simplified model. The reference model associates a ... [more ▼]

This paper presents two simulation models of scroll expanders for use in heat recovery Rankine cycle applications: a detailed reference model and a simplified model. The reference model associates a detailed geometrical description of the expander to a thermodynamic modeling of the expansion process in the machine. Due to large computational effort, the reference model is not appropriate for simulation of the entire Rankine cycle system. The paper shows how a simplified model can be built from the reference model. This model involves a limited number of parameters, which describe the main features of the machine. An experimental study is carried out on a prototype of Rankine cycle working with HCFC-123. Based on detailed measurements, the validation of both models is conducted. It is found that both models are able to predict the mass flow rate, the delivered shaft power and the discharge temperature with a good accuracy. [less ▲]

Detailed reference viewed: 836 (41 ULg)
Full Text
Peer Reviewed
See detailAttention to self-referential stimuli: can I ignore my own face?
Devue, Christel ULg; Brédart, Serge ULg

in Acta Psychologica (2008), 128(2), 290-7

Auto-referential materials (i.e., the own name) have been described as particularly prone to capture attention. Some recent studies have questioned this view and shown that these own name effects are ... [more ▼]

Auto-referential materials (i.e., the own name) have been described as particularly prone to capture attention. Some recent studies have questioned this view and shown that these own name effects are temporary and appear only in specific conditions: when enough resources are available (Harris, C. R., & Pashler, H. (2004). Attention and the processing of emotional words and names: Not so special after all. Psychological Science, 15, 171-178) or when the own name is presented within the focus of attention if it is a task-irrelevant stimulus (Gronau, N., Cohen, A., & Ben-Shakhar, G. (2003). Dissociations of personally significant and task-relevant distractors inside and outside the focus of attention: A combined behavioral and psychophysiological study. Journal of Experimental Psychology: General, 132, 512-529). In the present study, a stimulus that is unique to each individual was used: the self-face. In Experiment 1, the self-face produced a temporary distraction when presented at fixation during a digit-parity task. However, this distraction was not different from that triggered by another highly familiar face. In Experiment 2, the self-face failed to produce interference when presented outside the focus of attention. These results confirm recent findings showing that auto-referential materials do not automatically summon attention and have a distractive power only in specific conditions. [less ▲]

Detailed reference viewed: 195 (99 ULg)
Full Text
Peer Reviewed
See detailPersonality and mental time travel: a differential approach to autonoetic consciousness.
Quoidbach, Jordi ULg; Hansenne, Michel ULg; Mottet, Caroline

in Consciousness & Cognition (2008), 17(4), 1082-92

Recent research on autonoetic consciousness indicates that the ability to remember the past and the ability to project oneself into the future are closely related. The purpose of the present study was to ... [more ▼]

Recent research on autonoetic consciousness indicates that the ability to remember the past and the ability to project oneself into the future are closely related. The purpose of the present study was to confirm this proposition by examining whether the relationship observed between personality and episodic memory could be extended to episodic future thinking and, more generally, to investigate the influence of personality traits on self-information processing in the past and in the future. Results show that Neuroticism and Harm Avoidance predict more negative past memories and future projections. Other personality dimensions exhibit a more limited influence on mental time travel (MTT). Therefore, our study provide an additional evidence to the idea that MTT into the past and into the future rely on a common set of processes by which past experiences are used to envision the future. [less ▲]

Detailed reference viewed: 167 (42 ULg)
Full Text
Peer Reviewed
See detailIf you can regulate sadness, you can probably regulate shame: Associations between trait emotional intelligence, emotion regulation and coping efficiency across discrete emotions
Mikolajczak, Moïra; Nelis, Delphine ULg; Hansenne, Michel ULg et al

in Personality & Individual Differences (2008), 44(6), 1356-1368

The construct of trait emotional intelligence [trait El] encompasses individual dispositions related to the perception, processing, regulation, and utilization of emotional information. These emotion ... [more ▼]

The construct of trait emotional intelligence [trait El] encompasses individual dispositions related to the perception, processing, regulation, and utilization of emotional information. These emotion-related dispositions are located at the lower levels of personality hierarchies. Prior studies found that trait El promoted the utilization of adaptive coping strategies to regulate stress. The present study examined (1) whether this effect would extend to other emotions and (2) whether the coping styles used to regulate a given emotion would mediate the effect of trait El on the propensity to experience that particular emotion. Analyses revealed that trait El promoted the choice of adaptive strategies not only in the case of stress, but also anger, sadness, fear, jealousy, and shame. Trait El also promoted the use of adaptive strategies to maintain joy. We also found that high trait El individuals' choice of adaptive strategies to down-regulate various negative emotions and maintain positive ones explained their decreased propensity to experience these negative emotions and their increased propensity to experience positive ones. (c) 2007 Elsevier Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 192 (12 ULg)