Publications ORBi OA     Results 26801-26820 of 48906.   1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346   Recalling semantic information about personally known faces and voicesBrédart, Serge ; Barsics, Catherine ; Hanley, Rickin European Journal of Cognitive Psychology (2009), 21(7), 1013-1021Detailed reference viewed: 64 (19 ULg) Detection of nonlinearity in a dynamic system using deformation modes obtained from the Wavelet Transfrom of measured responsesNguyen, Viet Ha ; Peeters, Maxime ; Golinval, Jean-Claude Conference given outside the academic context (2009)An efficient approach to Structural Health Monitoring of dynamical systems based on the Wavelet Transform (WT) and the concept of subspace angle is presented. The objective is to propose a detection ... [more ▼]An efficient approach to Structural Health Monitoring of dynamical systems based on the Wavelet Transform (WT) and the concept of subspace angle is presented. The objective is to propose a detection method that is sensitive to the onset of nonlinear behaviour in a dynamic system. For this purpose, instantaneous frequencies are identified first from output-only vibration signals using the Wavelet Transform. Time varying deformation shapes are then extracted by analyzing the whole measurement data set on the structure. From this information, different dynamic states of the structure may be detected by inspecting time variations of ‘modal’ features. The experimental structure considered here as application example is a clamped beam with a geometric nonlinearity. Detection of nonlinearity is carried out by means of the concept of subspace angles between instantaneous deformation modes extracted from measurement data using the continuous Wavelet Transform. The method consists in controlling the angular coherence between active subspaces of the current and reference states respectively. The proposed technique, which shows a good sensitivity to small changes in the dynamic behaviour of the structure, may also be used for damage detection. [less ▲]Detailed reference viewed: 112 (29 ULg) Parameter estimation and structural model updating using modal methods in the presence of nonlinearityGolinval, Jean-Claude Conference given outside the academic context (2009)Detailed reference viewed: 45 (8 ULg) The Masses and Radii of HD186753B and TYC7096-222-1B: The First M-dwarfs known to Eclipse A-type StarsBentley, S. J.; Smalley, B.; Maxted, P. F. L. et alin Astronomy and Astrophysics (2009)We present observations of two new single-lined eclipsing binaries, both consisting of an Am star and an M-dwarf, discovered by the Wide Angle Search for Planets transit photometry survey. Using WASP ... [more ▼]We present observations of two new single-lined eclipsing binaries, both consisting of an Am star and an M-dwarf, discovered by the Wide Angle Search for Planets transit photometry survey. Using WASP photometry and spectroscopic measurements we find that HD186753B has an orbital period of $P=1.9194$ days, a mass of $M=0.24\pm0.02 M_{\odot}$ and radius of $R=0.31^{+0.06}_{-0.06} R_{\odot}$; and that TCY7096-222-1B has an orbital period of $P=8.9582$ days, a mass of between 0.29 and 0.54 $M_{\odot}$ depending on eccentricity and radius of $R=0.263^{+0.02}_{-0.07} R_{\odot}$. We find that the Am stars have relatively low rotational velocities that closely match the orbital velocities of the M-dwarfs, suggesting that they have been "spun-down" by the M-dwarfs. [less ▲]Detailed reference viewed: 21 (8 ULg) Black British LiteratureLedent, Bénédicte in Birch, Dinah (Ed.) The Oxford Companion to English Literature, seventh edition (2009)Detailed reference viewed: 157 (13 ULg) Damage and functional recovery of the Atlantic cod (Gadus morhua) inner ear hair cells following local injection of gentamicinFaucher, Karine ; Aas-Hansen, Øyvind; Damsgård, Borge et alin International Journal of Audiology (2009), 48(7), 456-464This study addresses the ultrastructural and functional damage and subsequent recovery of the inner ear in the Atlantic cod following intrasaccular gentamicin injection. Inner ear damage was assessed ... [more ▼]This study addresses the ultrastructural and functional damage and subsequent recovery of the inner ear in the Atlantic cod following intrasaccular gentamicin injection. Inner ear damage was assessed using SEM and measurements of AEP following 250-Hz pure-tone stimuli. Data from gentamicin-treated fish were compared with control (no injection) and sham (injection of saline) fish. Control fish had normal response thresholds associated with welldeveloped hair cell bundles in their macula sacculi. Sham fish had higher response thresholds compared with control fish during the first week post-intervention, but response thresholds were subsequently normal. Treated fish displayed significant inner ear damage associated with an increased average AEP threshold on the third day following treatment. Thereafter, inner ear tissue displayed signs of progressive regeneration until it was comparable to controls from the 14th day. Response thresholds were similar to those of control fish from the 17th day following treatment. These observations suggest that the macula sacculi of Atlantic cod can regenerate towards a near-complete functional and ultrastructural recovery within 17-21 days following ototoxic gentamicin treatment. [less ▲]Detailed reference viewed: 37 (3 ULg) A rare-event approach to build security analysis tools when N-k (k > 1) analyses are needed (as they are in large-scale power systems)Belmudes, Florence ; Ernst, Damien ; Wehenkel, Louis in Proceedings of the 2009 IEEE Bucharest PowerTech (2009)We consider the problem of performing N − k security analyses in large scale power systems. In such a context, the number of potentially dangerous N − k contingencies may become rapidly very large when k ... [more ▼]We consider the problem of performing N − k security analyses in large scale power systems. In such a context, the number of potentially dangerous N − k contingencies may become rapidly very large when k grows, and so running a security analysis for each one of them is often intractable. We assume in this paper that the number of dangerous N − k contingencies is very small with respect to the number of non-dangerous ones. Under this assumption, we suggest to use importance sampling techniques for identifying rare events in combinatorial search spaces. With such techniques, it is possible to identify dangerous contingencies by running security analyses for only a small number of events. A procedure relying on these techniques is proposed in this work for steady-state security analyses. This procedure has been evaluated on the IEEE 118 bus test system. The results show that it is indeed able to efficiently identify among a large set of contingencies some of the rare ones which are dangerous. [less ▲]Detailed reference viewed: 55 (7 ULg) Policy search with cross-entropy optimization of basis functionsBusoniu, Lucian; Ernst, Damien ; De Schutter, Bart et alin Proceedings of the IEEE International Symposium on Adaptive Dynamic Programming and Reinforcement Learning (ADPRL-09) (2009)This paper introduces a novel algorithm for approximate policy search in continuous-state, discrete-action Markov decision processes (MDPs). Previous policy search approaches have typically used ad-hoc ... [more ▼]This paper introduces a novel algorithm for approximate policy search in continuous-state, discrete-action Markov decision processes (MDPs). Previous policy search approaches have typically used ad-hoc parameterizations developed for specific MDPs. In contrast, the novel algorithm employs a flexible policy parameterization, suitable for solving general discrete-action MDPs. The algorithm looks for the best closed-loop policy that can be represented using a given number of basis functions, where a discrete action is assigned to each basis function. The locations and shapes of the basis functions are optimized, together with the action assignments. This allows a large class of policies to be represented. The optimization is carried out with the cross-entropy method and evaluates the policies by their empirical return from a representative set of initial states. We report simulation experiments in which the algorithm reliably obtains good policies with only a small number of basis functions, albeit at sizable computational costs. [less ▲]Detailed reference viewed: 29 (9 ULg) Reactions cutanees indesirables des traitements par anticorps monoclonaux.Pierard, Claudine ; Pierard, Gérald in Revue Médicale de Liège (2009), 64(5-6), 339-46A number of adverse skin reactions can occur during some treatments using monoclonal antibodies. Some of the reactions are specifically linked to the pharmacological effect of the drug. Others are the ... [more ▼]A number of adverse skin reactions can occur during some treatments using monoclonal antibodies. Some of the reactions are specifically linked to the pharmacological effect of the drug. Others are the expression of more common drug reactions. Their early recognition and their adequate management are important to consider in order to avoid a morbidity severely altering the quality of life and even the life prognosis. [less ▲]Detailed reference viewed: 165 (1 ULg) Pathologies sociales de la communicationDurand, Pascal in Questions de Communication (2009), 15La communication, dans sa généralité et dans la perspective des travaux récents de l'Ecole de Francfort, est généralement pensée comme solution à diverses pathologies sociales (isolement, malentendus ... [more ▼]La communication, dans sa généralité et dans la perspective des travaux récents de l'Ecole de Francfort, est généralement pensée comme solution à diverses pathologies sociales (isolement, malentendus réciproques, aliénation, etc.). Le présent article l'envisage comme un vecteur de pathologies spécifiques : anomie, censure, propagande, production d'idéologèmes divers. [less ▲]Detailed reference viewed: 286 (58 ULg) Continuous formulation for bottom friction in free surface flows modellingMachiels, Olivier ; Erpicum, Sébastien ; Archambeau, Pierre et alin River Basin Management V (2009)Bottom friction modelling is an important step in river flows computation with 1D or 2D solvers. It is usually performed using empirical laws established for uniform flow conditions or a modern approach ... [more ▼]Bottom friction modelling is an important step in river flows computation with 1D or 2D solvers. It is usually performed using empirical laws established for uniform flow conditions or a modern approach based on turbulence analysis. Following the definition of the flow validity field of the main friction laws proposed in the literature, an original continuous formulation has been developed. It is suited to model river flows with a wide range of properties (water depth, discharge, roughness…). The efficiency of this new formulation, theoretically established and numerically adjusted, is demonstrated through various practical applications. [less ▲]Detailed reference viewed: 31 (5 ULg) Autonomic aspect of emotional response in depressed patients: relationships with personality.Mardaga, S.; Hansenne, Michel in Neurophysiologie Clinique = Clinical Neurophysiology (2009), 39(4-5), 209-16STUDY AIM: Affective symptoms are major descriptors of depression; therefore, a lot of studies investigated emotional-responsiveness modulation in depression, and reported either a potentiation of ... [more ▼]STUDY AIM: Affective symptoms are major descriptors of depression; therefore, a lot of studies investigated emotional-responsiveness modulation in depression, and reported either a potentiation of negative affects, a reduction of positive affects, or a reduction of both positive and negative affects. On the other hand, personality was classically found to be modulated in depression, with behavioral inhibition system (BIS)-related dimensions (namely harm avoidance (HA), neuroticism) showing higher scores in depressed subjects. The aim of this study was to investigate the relationships between emotional responsiveness (as measured by skin conductance response [SCR]) and personality in depression. METHODS: SCR was recorded following the presentation of neutral, pleasant, and unpleasant pictures in 20 depressed subjects and 20 controls. RESULTS: Pleasant pictures elicited more and larger responses than unpleasant ones in control but not in depressed subjects. This effect was not modulated by personality. Moreover, depressed subjects were found to show generally faster half-recovery times and to rate emotional pictures as less arousing than control subjects and these effects disappeared when BIS-related dimensions were controlled. CONCLUSIONS: These results suggest that BIS-related dimensions are independent from the specifically reduced responses to pleasant pictures, but are involved in the observed general affect reducing. [less ▲]Detailed reference viewed: 48 (9 ULg) Long-term glycaemic control with metformin– sulphonylurea–pioglitazone triple therapy in PROactive (PROactive 17)Scheen, André ; Tan, M. H.; Betteridge, D. J. et alin Diabetic Medicine : A Journal of the British Diabetic Association (2009), 26(10), 1033-1039Aims We assessed the long-term glycaemic effects and the safety profile of triple therapy with the addition of pioglitazone vs. placebo in patients with Type 2 diabetes treated with combined ... [more ▼]Aims We assessed the long-term glycaemic effects and the safety profile of triple therapy with the addition of pioglitazone vs. placebo in patients with Type 2 diabetes treated with combined metformin–sulphonylurea therapy in the PROspective pioglitAzone Clinical Trial In macroVascular Events (PROactive). Methods In a post-hoc analysis, we identified patients treated with metformin plus sulphonylurea combination therapy and not receiving insulin at baseline (n = 1314). In those patients, we compared the effects of pioglitazone (force-titrated to 45 mg⁄ day, n = 654) vs. placebo (n = 660) on glycated haemoglobin (HbA1c) reduction, concomitant changes in medications and initiation of permanent insulin use (defined as daily insulin use for a period of ‡ 90 days or ongoing use at death ⁄ final visit). Results Significantly greater reductions in HbA1c and greater proportions of patients with HbA1c at target were noted with pioglitazone vs, placebo, despite a decrease in the use of other oral glucose-lowering agents. Therewas an approximate twofold increase in progression to permanent insulin use in the placebo group vs. the pioglitazone group: 31.1 vs. 16.1%, respectively, when added to combination therapy. The overall safety of themetformin–sulphonylurea–pioglitazone triple therapy was good. Conclusions Intensifying an existing dual oral therapy regimen to a triple oral regimen by adding pioglitazone to the classical metformin–sulphonylurea combination resulted in sustained improvements in glycaemic control and reduced progression to insulin therapy. The advantages and disadvantages of adding pioglitazone instead of adding basal insulin should be assessed further. [less ▲]Detailed reference viewed: 35 (0 ULg) Thérapies biologiques et maladies inflammatoires chroniques intestinalesReenaers, Catherine ; Louis, Edouard ; Belaiche, Jacques in Revue Médicale de Liège (2009), 64(5-6), 301-304Detailed reference viewed: 56 (3 ULg) Insights into the Defense-Related Events Occuring in Plant Cells Following Perception of Surfactin-Type Lipopeptide from Bacillus subtilisJourdan, Emmanuel ; Henry, Guillaume; Duby, F. et alin Molecular Plant-Microbe Interactions [=MPMI] (2009), 22(4), 456-468Multiple strains of Bacillus subtilis were demonstrated to stimulate plant defense responses, and cyclic lipopeptides may be involved in the elicitation of this induced systemic resistance phenomenon ... [more ▼]Multiple strains of Bacillus subtilis were demonstrated to stimulate plant defense responses, and cyclic lipopeptides may be involved in the elicitation of this induced systemic resistance phenomenon. Here, we further investigated molecular events underlying the interaction between wuch lipopeptides and plant cells. Addition of surfactin but not fengycin or iturin in the micromolar range to tobacco cell suspensions induced defense-related early events such as extracellular medium alkalinization coupled with ion fluxes and reactive oxygen species production. Surfactin also stimulated the defense enzymes phenylalanine ammonia lyase and lipoxygenase and modified the pattern of phenolics produced by the elicited cells. The occurence of these surfactin-elicited early events is closely related to Ca2+ influx and dynamic changes in protein phosphorylation but is not associed with any marked phytotoxicity or adverse effect on the integrity and growth potential of the treated tobacco cells. [less ▲]Detailed reference viewed: 85 (30 ULg) New insights into short-chain prenyltransferases: structural features, evolutionary history and potential for selective inhibition.Vandermoten, Sophie ; Haubruge, Eric ; Cusson, M.in Cellular and Molecular Life Sciences : CMLS (2009), 66Isoprenoids form an extensive group of natural products involved in a number of important biological processes. Their biosynthesis proceeds through sequential 1'-4 condensations of isopentenyl diphosphate ... [more ▼]Isoprenoids form an extensive group of natural products involved in a number of important biological processes. Their biosynthesis proceeds through sequential 1'-4 condensations of isopentenyl diphosphate (C(5)) with an allylic acceptor, the first of which is dimethylallyl diphosphate (C(5)). The reactions leading to the production of geranyl diphosphate (C(10)), farnesyl diphosphate (C(15)) and geranylgeranyl diphosphate (C(20)), which are the precursors of mono-, sesqui- and diterpenes, respectively, are catalyzed by a group of highly conserved enzymes known as short-chain isoprenyl diphosphate synthases, or prenyltransferases. In recent years, the sequences of many new prenyltransferases have become available, including those of several plant and animal geranyl diphosphate synthases, revealing novel mechanisms of product chain-length selectivity and an intricate evolutionary path from a putative common ancestor. Finally, there is considerable interest in designing inhibitors specific to short-chain prenyltransferases, for the purpose of developing new drugs or pesticides that target the isoprenoid biosynthetic pathway. [less ▲]Detailed reference viewed: 75 (35 ULg) Préface à "Mot à Mot" de Henri DeleersnijderDurand, Pascal in Deleersnijder, Henri (Ed.) Mot à Mot (2009)Detailed reference viewed: 149 (22 ULg) Cardiac Power Output during Dobutamine StressSandersen, Charlotte ; Mc Entee, Kathleen ; Deleuze, Stefan et alin Journal of Equine Veterinary Science (2009)Detailed reference viewed: 38 (14 ULg) Ce que causer veut direDurand, Pascal in Durand, Pascal (Ed.) Entre presse et littérature. Le Mousquetaire, journal de M. Alexandre Dumas (1853-1857) (2009)Detailed reference viewed: 69 (27 ULg) Effects of oral contraception with ethinylestradiol and drospirenone on oxidative stress in women 18-35 years old.De Groote, D.; PERRIER d'HAUTERIVE, Sophie ; Pintiaux, Axelle et alin Contraception (2009), 80(2), 187-93Background Oral contraceptives (OCs) with estrogens and progestins may affect oxidative stress (OS) status. Study design A group of 32 women using oral contraceptives (OCU) containing 0.03 mg ... [more ▼]Background Oral contraceptives (OCs) with estrogens and progestins may affect oxidative stress (OS) status. Study design A group of 32 women using oral contraceptives (OCU) containing 0.03 mg ethinylestradiol and 3 mg drospirenone have been compared to a matched control group of 30 noncontraception users (NCU). Blood levels of antioxidants, trace elements and markers of lipid peroxidation were assessed by biochemical methods. A microarray analysis of whole blood mRNA levels of 200 genes involved in OS-dependant pathway was also performed. Results Levels of zinc, vitamin E and antibodies to oxidized low-density lipoproteins (LDLs) were not significantly different between the two groups. On the other hand, significant increases in the mean levels of lipid peroxides (+176%, p<.001), oxidized LDLs (+145%, p<.002), copper (+103%, p<.001), Cu/Zn ratio (+100%, p<.001) and a significant decrease in the mean level of β-carotene (−41%, p<.01) were observed in the OCU compared to NCU. There was a highly significant positive correlation between the lipid peroxide levels and the copper-to-zinc ratio. From the 200 genes tested by microarray, one coding for HSP70 was significantly up-regulated (log2 fold change=+ 0.45, p<.02) and one coding for inducible nitric oxide synthase significantly down-regulated (log2 fold change=−0.24, p<.05) in the OCU compared to the NCU. Conclusions The recently introduced combination of ethinylestradiol and drospirenone induced the heightening of lipid peroxidation correlated with high levels of copper, a situation that could be associated with increased cardiovascular risk. [less ▲]Detailed reference viewed: 105 (5 ULg)