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See detailACLALS @ Buckingham Palace: A Cynical Scholar's Report on the Celebration of the Commonwealth's Diamond Anniversary
Tunca, Daria ULg

in Davis, Geoffrey V.; Delrez, Marc; Ledent, Bénédicte (Eds.) ACLALS Newsletter (2009)

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See detailDesign Procedure of a Nonlinear Vibration Absorber Using Bifurcation Analysis
Viguié, Régis ULg; Kerschen, Gaëtan ULg

in 27th International Modal Analysis Conference, Orlando, 2009 (2009)

A nonlinear energy sink (NES) is characterized by its ability to passively realize targeted energy transfer as well as multimodal damping. This latter feature seems to make this device very well suited ... [more ▼]

A nonlinear energy sink (NES) is characterized by its ability to passively realize targeted energy transfer as well as multimodal damping. This latter feature seems to make this device very well suited for reducing the vibration level of MDOF linear structures. The perspective of dealing with MDOF linear primary structures requires the development of an efficient NES design procedure. This paper poses the basis of such a procedure based upon the bifurcation analysis of a system composed of a linear oscillator coupled to a NES, using the software MatCont. [less ▲]

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See detailChallenges for Biomarker Discovery in Body Fluids Using SELDI-TOF-MS
De Bock, Muriel ULg; De Seny, Dominique ULg; Meuwis, Marie-Alice ULg et al

in Journal of Biomedicine & Biotechnology (2009)

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See detailEtudier à l'université : le poids des pairs et du capital culturel face aux aspirations d'étude.
Dupriez, Vincent; Monseur, Christian ULg; Van Campenhoudt, Maud

in Cahiers de Recherche en Éducation et Formation (2009), 75

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See detailOptimisation des calendriers d'irrigation pour le périmètre irrigué de la Vallée du Kou à l'aide du logiciel SIMIS
Wellens, Joost ULg; Nitcheu, Martial; Sawadogo, Brehima et al

in Journées Scientifiques 2iE; 2009 (2009)

La vallée du Kou, situé dans le Sud-ouest du Burkina Faso, a été depuis le milieu des années 70, le lieu d’un développement rapide de l’irrigation. Reconnue comme une excellente plaine à vocation agricole ... [more ▼]

La vallée du Kou, situé dans le Sud-ouest du Burkina Faso, a été depuis le milieu des années 70, le lieu d’un développement rapide de l’irrigation. Reconnue comme une excellente plaine à vocation agricole, notamment pour la riziculture en raison de ses potentialités hydrauliques, le périmètre irrigué de la vallée du Kou revêt une importance majeure dans les économies à proximité. Malheureusement, ce périmètre de 1.260 ha est aujourd’hui peu performant. Les causes principales sont les pénuries en eau chroniques dues à une intensification des utilisateurs en amont du périmètre et la mauvaise gestion de l’eau sur le périmètre. C’est dans ce sens qu’il a été jugé nécessaire d’entreprendre une stratégie d’amélioration de la gestion de l’irrigation sur le périmètre. Après avoir élaboré un diagnostic des efficiences en irrigation, le logiciel SIMIS (Mateos et al., 2002) a été mis en place afin de proposer des scénarii d’irrigation fiables et équitables. [less ▲]

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See detailLe périmètre irrigué de la Vallée du Kou: Diagnostic des efficiences hydro-agricole et élaboration des calendriers d'irrigation à l'aide de SIMIS (étude de cas)
Wellens, Joost ULg; Nitcheu, Martial

Report (2009)

La vallée du Kou a été depuis le milieu des années 70, le lieu d’un développement rapide de l’irrigation. Reconnue comme une excellente plaine à vocation agricole notamment pour la riziculture, en raison ... [more ▼]

La vallée du Kou a été depuis le milieu des années 70, le lieu d’un développement rapide de l’irrigation. Reconnue comme une excellente plaine à vocation agricole notamment pour la riziculture, en raison de ses importantes potentialités hydrauliques le périmètre irrigué de la vallée du Kou revêt une importance majeure dans les économies des communautés rurales et urbaines situées à proximité. D’une superficie totale aménagée de 1.260 ha, l’aménagement dudit périmètre à vocation rizicole a été réalisé de 1969 à 1970 dans le cadre de l’autosuffisance alimentaire. Malheureusement, ce périmètre est aujourd’hui peu performant à cause de la réduction progressive des surfaces emblavées au fil des années et de la faible productivité. De 7 t/ha environ de paddy par campagne pendant les premières années après l’aménagement, les rendements sont passés à 4 t/ha dans les dernières années. Actuellement, en station d’essai, les rendements atteignent 7 à 8 t/ha. Cela montre donc clairement les possibilités d’accroître les rendements sur les périmètres irrigués. Les causes principales de cette contre performance sont des pénuries en eau chroniques due à une intensification des utilisateurs en amont du périmètre et la mauvaise gestion de l’eau sur le périmètre. La question de la gestion de l’eau d’irrigation devient alors primordiale. C’est dans ce sens qu’il a été jugé nécessaire d'entreprendre une stratégie d'amélioration de la gestion de l'irrigation sur le périmètre. Après avoir élaboré un diagnostic des efficiences en irrigation, le logiciel SIMIS a été mis en place afin de proposer des scénarii d’irrigation fiables et équitables. [less ▲]

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See detailDroit et philosophie du langage ordinaire
Pieret, Denis ULg

in Dissensus (2009), 3

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See detailAnthropologie et migrations africaines : une généalogie des recherches
Kuczynski; Razy, Elodie ULg

in Revue Européenne des Migrations Internationales (2009), 25(3), 79-100

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See detailInsuline detemir (Levemir) dans l'etude predictive: resultats obtenus chez les patients diabetiques de type 1 de la cohorte belge.
Philips, Jean-Christophe ULg; Scheen, André ULg

in Revue Médicale de Liège (2009), 64(3), 124-30

Insulin detemir (Levemir) is a soluble human insulin analogue acylated with a 14-carbon fatty acid, which reversibly binds to albumin, thereby providing a more prolonged metabolic effect with lower ... [more ▼]

Insulin detemir (Levemir) is a soluble human insulin analogue acylated with a 14-carbon fatty acid, which reversibly binds to albumin, thereby providing a more prolonged metabolic effect with lower variability as compared to NPH insulin taken as reference. Thanks to this pharmacokinetic and pharmacodynamic profile, insulin detemir is essentially used within a basal-bolus regimen. We report the results obtained in 232 type 1 diabetic patients recruited in Belgium in the frame of the international observational, open, prospective PREDICTIVE study. In patients initially treated with either NPH insulin or glargine, followed for 26 weeks, the shift to insulin detemir did not change HbA1c levels, but significantly reduced both the mean and the variability of fasting blood glucose levels while diminishing the risk of hypoglycaemic episodes, especially at night. Therefore, insulin detemir was associated with significantly improved quality of life. These changes were obtained with a slight increase in daily insulin doses but without weight gain. [less ▲]

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See detailEnhancing temporal correlations in EOF expansions for the reconstruction of missing data using DINEOF
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Sirjacobs, Damien ULg et al

in Ocean Science (2009), 5(4), 475-485

DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based technique for the reconstruction of missing data in geophysical fields, such as those produced by clouds in sea surface ... [more ▼]

DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based technique for the reconstruction of missing data in geophysical fields, such as those produced by clouds in sea surface temperature satellite images. A technique to reduce spurious time variability in DINEOF reconstructions is presented. The reconstruction of these images within a long time series using DINEOF can lead to large discontinuities in the reconstruction. Filtering the temporal covariance matrix allows to reduce this spurious variability and therefore more realistic reconstructions are obtained. The approach is tested in a three years sea surface temperature data set over the Black Sea. The effect of the filter in the temporal EOFs is presented, as well as some examples of the improvement achieved with the filtering in the SST reconstruction, both compared to the DINEOF approach without filtering. [less ▲]

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See detailAppropriate myocardial revascularization: a joint viewpoint from an interventional cardiologist and a cardiac surgeon.
Wijns, William; Kolh, Philippe ULg

in European Heart Journal (2009), 30(18), 2182-5

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See detailNumerical modelling of timber connections under fire loading using a component model
Cachim, Paulo B.; Franssen, Jean-Marc ULg

in Fire Safety Journal (2009), 44

This paper describes a component model for dowelled timber connections under fire loading. The component model of the dowelled connection is first developed and calibrated for room temperature. The ... [more ▼]

This paper describes a component model for dowelled timber connections under fire loading. The component model of the dowelled connection is first developed and calibrated for room temperature. The constitutive relations for dowel–timber interaction are detailed and compared with experimental results. In the fire situation, a two-step approach is used: first, three-dimensional (3D) thermal analysis of the connection is performed using a conductive model with timber properties defined in Eurocode 5 in order to calculate the temperatures in the fasteners and timber; afterwards, the mechanical analysis using a component model is carried out using mechanical properties of the steel dowel and of timber adjusted to the temperatures obtained by the thermal analyses. These properties are reduced according to Eurocode 3 and Eurocode 5, respectively. Numerical simulations are presented that allow evaluation of the model behaviour and performance. Obtained results show good agreement with available experimental data, indicating that regardless of its simplicity, the component model has the capability to accurately model timber connections under fire loading [less ▲]

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See detailReinforcement learning versus model predictive control: a comparison on a power system problem
Ernst, Damien ULg; Glavic, Mevludin; Capitanescu, Florin ULg et al

in IEEE Transactions on Systems, Man & Cybernetics : Part B (2009), 33(2), 517-519

This paper compares reinforcement learning (RL) with model predictive control (MPC) in a unified framework and reports experimental results of their application to the synthesis of a controller for a ... [more ▼]

This paper compares reinforcement learning (RL) with model predictive control (MPC) in a unified framework and reports experimental results of their application to the synthesis of a controller for a nonlinear and deterministic electrical power oscillations damping problem. Both families of methods are based on the formulation of the control problem as a discrete-time optimal control problem. The considered MPC approach exploits an analytical model of the system dynamics and cost function and computes open-loop policies by applying an interior-point solver to a minimization problem in which the system dynamics are represented by equality constraints. The considered RL approach infers in a model-free way closed-loop policies from a set of system trajectories and instantaneous cost values by solving a sequence of batch-mode supervised learning problems. The results obtained provide insight into the pros and cons of the two approaches and show that RL may certainly be competitive with MPC even in contexts where a good deterministic system model is available. [less ▲]

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See detailL-band and C-band studies of African volcanic areas
Wauthier, Christelle ULg; Oyen, A.; Marinkovic, P. et al

in Proc. of Geoscience and Remote Sensing Symposium, 2009 IEEE International, IGARSS 2009 , July 13-17 2009, Cape Town, Africa (2009)

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See detailLes prix littéraires : construire la littérature, soulager le public
Spinoy, Erik ULg

Article for general public (2009)

Literary prizes are an increasingly important tool for the construction of literature, in an era where more traditional literary institutions are subject to erosion. In contributing to constructing ... [more ▼]

Literary prizes are an increasingly important tool for the construction of literature, in an era where more traditional literary institutions are subject to erosion. In contributing to constructing literature, they relieve the public of the anxiety it feels when it is confronted with the pluriformity of the literary 'Real', by choosing 'for it'. [less ▲]

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See detailContribution of a Dense Population of the Brittle Star Acrocnida brachiata (Montagu) to the Biogeochemical Fluxes of CO2 in a Temperate Coastal Ecosystem
Davoult, D.; Harlay, Jérôme ULg; Gentil, F.

in Estuaries and Coasts (2009), 32(6), 1103-1110

The production of organic matter and calcium carbonate by a dense population of the brittle star Acrocnida brachiata (Echinodermata) was calculated using demographic structure, population density, and ... [more ▼]

The production of organic matter and calcium carbonate by a dense population of the brittle star Acrocnida brachiata (Echinodermata) was calculated using demographic structure, population density, and relations between the size (disk diameter) and the ash-free dry weight (AFDW) or the calcimass. During a 2-year survey in the Bay of Seine (Eastern English Channel, France), organic production varied from 29 to 50 g(AFDW) m(-2) year(-1) and CaCO3 production from 69 to 104 g(CaCO3) m(-2) year(-1). Respiration was estimated between 1.7 and 2.0 mol(CO2) m(-2) year(-1). Using the molar ratio (psi) of CO2 released: CaCO3 precipitated, this biogenic precipitation of calcium carbonate would result in an additional release between 0.5 and 0.7 mol(CO2) m(-2) year(-1) that represented 23% and 26% of total CO2 fluxes (sum of calcification and respiration). The results of the present study suggest that calcification in temperate shallow environments should be considered as a significant source of CO2 to seawater and thus a potential source of CO2 to the atmosphere, emphasizing the important role of the biomineralization (estimated here) and dissolution (endoskeletons of dead individuals) in the carbon budget of temperate coastal ecosystems. [less ▲]

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See detailOrganic surface coating on Coccolithophores - Emiliania huxleyi: Its determination and implication in the marine carbon cycle
Godoi, R. H. M.; Aerts, K.; Harlay, Jérôme ULg et al

in Microchemical Journal (2009), 91(2), 266-271

Most of the marine precipitation of CaCO3 is due to the biological activities of planktonic and benthic organisms in waters largely oversaturated with respect to calcium carbonates. This saturation state ... [more ▼]

Most of the marine precipitation of CaCO3 is due to the biological activities of planktonic and benthic organisms in waters largely oversaturated with respect to calcium carbonates. This saturation state is expected to decrease as CO2 increases in seawater. A conventional view in oceanography suggests that calcium carbonates organisms are preserved in oversaturated waters and dissolve only below the lysocline. However. it has be postulated that a fraction of the CaCO3 precipitated biogenically could dissolve in oversaturated waters due to the formation of microenvironments in which respired CO2 decreases the saturation state of seawater (Omega) in the vicinity of CaCO3 crystals. In the present study, cells of the coccolithophore Emiliania huxleyi obtained from laboratory cultures and field samples collected in the Gulf of Biscay, were examined using "variable-energy" electron-probe microanalysis. to determine the presence and thickness of their organic coating. In addition, a new approach for transferring micrometer-sized particles from a filter onto transmission electron microscope grids using manipulators was used to investigate individual coccolithophores. The dry thickness of an organic coating over the coccolithophore surface was found to range between 280 and 350 nm. The resemblance of this coating to the carbohydrates produced and released by the cell is discussed as well as their potential for constituting a microenvironment that hosts bacteria. The properties of this organic coating and its role in the preservation/dissolution and export of biogenic carbonates in the water column are one of the major issues of carbonate geochemistry. (C) 2009 Elsevier B.V. All rights reserved. [less ▲]

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See detailMeasuring home-range quality in the frugivorous gibbon (Hylobates lar)
Hambuckers, Alain ULg; Huynen, Marie-Claude ULg; Savini, Tommaso

Conference (2009)

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See detailPlace des fibrates dans le traitement de patients avec une dyslipidemie atherogene.
Ducobu, J.; Scheen, André ULg; Legat, P. et al

in Revue Médicale de Liège (2009), 64(10), 512-8

The demography of dyslipidemia has changed towards a more complex atherogenic dyslipidemia involving increased levels of LDL cholesterol, in particular highly atherogenic small dense particles ... [more ▼]

The demography of dyslipidemia has changed towards a more complex atherogenic dyslipidemia involving increased levels of LDL cholesterol, in particular highly atherogenic small dense particles, hypertriglyceridemia and low HDL cholesterol, together with increased levels of markers of inflammation, thrombogenesis and endothelial dysfunction. Statins were shown to significantly lower cardiovascular morbidity and mortality, but treated patients are still left with a high residual risk, in particular for those with metabolic syndrome, type 2 diabetes, or low HDL cholesterol levels. Fibrates have been shown to reduce plasma triglycerides and increase HDL cholesterol, while improving inflammation, thrombogenesis and endothelial dysfunction. Clinical trials with fibrates have demonstrated their potential to reduce cardiovascular morbidity and mortality too, often through other mechanisms than those of statins. Combination trials of statins with fibrates have shown a more complete improvement of lipid profile and risk markers than each class separately. In contrast with gemfibrozil, fenofibrate does not interact significantly with the pharmacokinetics of statins, and its combination with statins has been shown to have a low risk of muscular side-effects or liver toxicity. The ACCORD outcome trial is exploring possible benefits of the combination of fenofibrate with statins on morbidity and mortality of patients with type 2 diabetes. [less ▲]

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See detailEvaluation of network equivalents for voltage optimization in multi-area power systems
Phulpin, Yannick; Miroslav, Begovic; Petit, Marc et al

in IEEE Transactions on Power Systems (2009), 24(2), 729-743

The paper addresses the problem of decentralized optimization for a power system partitioned into several areas controlled by different transmission system operators (TSOs). The optimization variables are ... [more ▼]

The paper addresses the problem of decentralized optimization for a power system partitioned into several areas controlled by different transmission system operators (TSOs). The optimization variables are the settings for taps, generators’ voltages and compensators’, and the objective function is either based on the minimization of reactive power support, the minimization of active power losses, or a combination of both criteria. We suppose that each TSO assumes an external network equivalent for its neighboring areas and optimizes without concern for the neighboring systems’ objectives its own optimization function. We study, in the context where every TSO adopts the same type of objective function, the performance of an iterative scheme, where every TSO refreshes at each iteration the parameters of its external network equivalents depending on its past internal observations, solves its local optimization problem, and then, applies its “optimal actions” to the power system. In the context of voltage optimization, we find out that this decentralized control scheme can converge to nearly optimal global performance for relatively simple equivalents and simple procedures for fitting their parameters. [less ▲]

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