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See detailLe retour du saumon et l'écologie des poissons migrateurs en Ourthe-Vesdre-Amblève
Ovidio, Michaël ULiege

Conference given outside the academic context (2017)

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See detailSystem Eigenvalue Identification Of Mistuned Bladed Disks Using Least-Squares Complex Frequency-Domain Method
Huang, Yuan; Kielb, Robert E.; Li, Jing et al

in Proceeding of the Turbomachinery Technical Conference & Exposition TURBO EXPO 2017 (2017, June 26)

This paper presents the results from a research effort on eigenvalue identification of mistuned bladed rotor systems using the Least-Squares Complex Frequency-Domain (LSCF) modal parameter estimator. The ... [more ▼]

This paper presents the results from a research effort on eigenvalue identification of mistuned bladed rotor systems using the Least-Squares Complex Frequency-Domain (LSCF) modal parameter estimator. The LSCF models the frequency response function (FRF) obtained from a vibration test using a matrix-fraction description and obtains the coefficients of the common denominator polynomial by minimizing the least squares error of the fit between the FRF and the model. System frequency and damping information is obtained from the roots of the denominator; a stabilization diagram is used to separate physical from mathematical poles. The LSCF estimator is known for its good performance when separating closely spaced modes, but few quantitative analyses have focused on the sensitivity of the identification with respect to mode concentration. In this study, the LSCF estimator is applied on both computational and experimental forced responses of an embedded compressor rotor in a three-stage axial research compressor. the LSCF estimator is first applied to computational FRF data obtained from a mistuned first-torsion (1T) forced response prediction using FMM (Fundamental Mistuning Model) and is shown to be able to identify the eigenvalues with high accuracy. Then the first chordwise bending (1CWB) computational FRF data is considered with varied mode concentration by varying the mistuning standard deviation. These cases are analyzed using LSCF and a sensitivity algorithm is developed to evaluate the influence of the mode spacing on eigenvalue identification. Finally, the experimental FRF data from this rotor blisk is analyzed using the LSCF estimator. For the dominant modes, the identified frequency and damping values compare well with the computational values. [less ▲]

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See detailUntangling glycaemia and mortality in critical care
Uyttendaele, Vincent ULiege; Dickson, Jennifer L.; Shaw, Geoffrey M. et al

in Critical Care (2017), 21(1), 152

Background: Hyperglycaemia is associated with adverse outcomes in the intensive care unit, and initial studies suggested outcome benefits of glycaemic control (GC). However, subsequent studies often ... [more ▼]

Background: Hyperglycaemia is associated with adverse outcomes in the intensive care unit, and initial studies suggested outcome benefits of glycaemic control (GC). However, subsequent studies often failed to replicate these results, and they were often unable to achieve consistent, safe control, raising questions about the benefit or harm of GC as well as the nature of the association of glycaemia with mortality and clinical outcomes. In this study, we evaluated if non-survivors are harder to control than survivors and determined if glycaemic outcome is a function of patient condition and eventual outcome or of the glycaemic control provided. Methods: Clinically validated, model-based, hour-to-hour insulin sensitivity (SI) and its hour-to-hour variability (%ΔSI) were identified over the first 72 h of therapy in 145 patients (119 survivors, 26 non-survivors). In hypothesis testing, we compared distributions of SI and %ΔSI in 6-hourly blocks for survivors and non-survivors. In equivalence testing, we assessed if differences in these distributions, based on blood glucose measurement error, were clinically significant. Results: SI level was never equivalent between survivors and non-survivors (95% CI of percentage difference in medians outside ±12%). Non-survivors had higher SI, ranging from 9% to 47% higher overall in 6-h blocks, and this difference became statistically significant as glycaemic control progressed. %ΔSI was equivalent between survivors and non-survivors for all 6-hourly blocks (95% CI of difference in medians within ±12%) and decreased in general over time as glycaemic control progressed. Conclusions: Whereas non-survivors had higher SI levels, variability was equivalent to that of survivors over the first 72 h. These results indicate survivors and non-survivors are equally controllable, given an effective glycaemic control protocol, suggesting that glycaemia level and variability, and thus the association between glycaemia and outcome, are essentially determined by the control provided rather than by underlying patient or metabolic condition. [less ▲]

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See detailLe contrôle du respect des droits fondamentaux de ses condamnés par la Cour pénale internationale : théorie et pratique naissante
Deprez, Christophe ULiege

Conference (2017, June 23)

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2017 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 23 juin 2017 par l ... [more ▼]

Cette présentation PowerPoint a servi de support à une communication orale dans le cadre de l'édition 2017 de la Conférence des Assistants en droit de Belgique (ACCA), organisée le 23 juin 2017 par l'Université de Liège. [less ▲]

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See detailQuatre années d'un chantier au XVIe siècle : la façade méridionale de la collégiale Saint-Martin de Liège
Joly, Emmanuel ULiege

Conference (2017, June 23)

Bien que peu étudiée jusqu'ici, la reconstruction de la collégiale Saint-Martin est une des entreprises monumentales majeures du XVIe siècle à Liège. Le bâti et les archives conservées permettent d ... [more ▼]

Bien que peu étudiée jusqu'ici, la reconstruction de la collégiale Saint-Martin est une des entreprises monumentales majeures du XVIe siècle à Liège. Le bâti et les archives conservées permettent d'appréhender, parfois avec précision, la chronologie et les modalités de la reconstruction de cette église. Ainsi, au chantier du chœur, dont la première pierre est posée en 1511, succède le chantier du transept et de la nef, qui fait l'objet d'un contrat signé en 1539 entre le chapitre et le maître maçon Paul de Richelle. Dans cette communication, nous proposons un focus sur les quatre premières années du chantier de la nef et du transept. La période située entre 1539 et 1543 constitue en effet un moment riche en événements clefs. En mars 1540, le chapitre de la collégiale demande explicitement à ce que la façade sud de l'église soit construite en priorité. En plus de nous fournir les motivations esthétiques et pratiques de ce choix, la décision prise par les chanoines nous permet de circonscrire avec précision les travaux qui sont entamés dans un premier temps, et ainsi de pouvoir les analyser finement. De plus, cette première phase est marquée par le décès tragique de Paul de Richelle en 1541, ainsi que par l'implication dans le chantier d'une des personnalités majeures du milieu de la construction en vallée mosane. Cette communication aura donc pour but de mettre en lumière le déroulement du chantier, d'en présenter les acteurs majeurs et de mettre au jour les nombreux changements qui se sont produits dans l'intervalle de ces quatre années. En mettant en relation les données archivistiques, dont la plupart sont inédites, avec les données acquises grâce à l'étude du bâti, nous analyserons l'impact de l'ensemble de ces éléments, tant sur l'organisation du chantier que sur les choix formels et esthétiques. [less ▲]

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See detailCassava Mosaic and Brown Streak Diseases: Current Perspectives and Beyond
Rey, M.E.C.; Vanderschuren, Hervé ULiege

in Annual Review of Virology (2017), 4

Cassava is the fourth largest source of calories in the world but is subject to economically important yield losses due to viral diseases, including cassava brown streak disease and cassava mosaic disease ... [more ▼]

Cassava is the fourth largest source of calories in the world but is subject to economically important yield losses due to viral diseases, including cassava brown streak disease and cassava mosaic disease. Cassava mosaic disease occurs in sub-Saharan Africa and the Asian subcontinent and is associated with nine begomovirus species, whereas cassava brown streak disease has to date been reported only in sub-Saharan Africa and is caused by two distinct ipomovirus species. We present an overview of key milestones and their significance in the understanding and characterization of these two major diseases as well as their associated viruses and whitefly vector. New biotechnologies offer a wide range of opportunities to reduce virus-associated yield losses in cassava for farmers and can additionally enable the exploitation of this valuable crop for industrial purposes. This review explores established and new technologies for genetic manipulation to achieve desired traits such as virus resistance. [less ▲]

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See detailLes directeurs de prison et le savoir: objet et sens d'une recherche
Dubois, Christophe ULiege

Scientific conference (2017, June 23)

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See detailLes rouleaux littéraires coptes de papyrus (fin du IIIe - VIIe siècle)
Carlig, Nathan ULiege

Conference (2017, June 23)

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See detailLatest results with LBTI's Vortex coronagraph: real-time tip/tilt sensing, new data reduction algorithms, and YSO observations
Defrere, Denis ULiege; Hinz, Philip; Absil, Olivier ULiege

Speech/Talk (2017)

Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They enhance the dynamic range at very small inner working angle ... [more ▼]

Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They enhance the dynamic range at very small inner working angle (down to the diffraction limit of the telescope) and provide a clear 360 degree discovery space for high-contrast direct imaging of exoplanets. In 2013, we installed and commissioned an L-band coronagraph in LBTI/LMIRCam and obtained outstanding images of the four planets around HR8799 during the first hours on sky. In this presentation, we will present the results of the latest data reduction performed with the VIP software that is developed at the University of Liège and that features state-of-the-art image processing algorithms inherited from the field of background subtraction in computer vision (including machine learning algorithms and low rank modeling algorithms). We will also present the results obtained with the second L- and M-band coronagraph that was recently installed in LMIRCam to enable binocular Vortex observations. During the first observations (October 2016), we tested and validated a new real-time post-coronagraphic tip-tilt sensing technique (called QACITS) to quickly align each beam on the center of their respective Vortex coronagraph and obtained observations of a young star showing disk features near the resolution limit of each aperture. Finally, we will present some exciting prospects for the Vortex coronagraph that will be installed on VISIR and ELT/METIS. [less ▲]

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