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See detailEgypte ancienne et Elevage d'Autruche
Njikam Nsangou, Ibrahim ULg

Article for general public (2007)

Il y a environ 20 à 60 millions d’années, l’autruche se retrouvait autour de la Méditerranée à l’Ouest, en Chine à l’Est et en Mongolie au nord. Une polémique anime les milieux scientifiques, surtout les ... [more ▼]

Il y a environ 20 à 60 millions d’années, l’autruche se retrouvait autour de la Méditerranée à l’Ouest, en Chine à l’Est et en Mongolie au nord. Une polémique anime les milieux scientifiques, surtout les paléontologues : les autruches ont-elles migrés d’Afrique vers l’Eurasie ou l’inverse ? Cependant, se référant aux autres espèces, il est unanimement admis qu’ il y a 1 million d’année seulement que plusieurs grands mammifères terrestres ont migré vers le sud en Afrique, les autruches aussi(voir Carte 1). En chine, on a retrouvé dans des caves occupées il y a 2500 ans avant l’ère actuelle, des coquilles d’œufs d’autruche (Anita Holtzhausen & Marlene Kotzé, 1990) La domestication de l’autruche remonte à la plus haute antiquité, et c’est tout naturellement dans le nord de l’Afrique que se rencontrent les témoignages des plus anciennes relations entre l’homme et l’autruche (Njikam N.I., 1997 ; Bruno Cornette et Lebailly, 1998). L’autruche, bien connu des Egyptiens, figure parmi les pictogrammes de l’écriture hiéroglyphique. [less ▲]

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See detail"L'Egypte gréco-romaine révélée par les papyrus" : L'esclave (Recueil de documents papyrologiques)
Straus, Jean ULg

Book published by Université de Liège. Sciences de l'Antiquité. Langues et littératures classiques (2004)

A selection of 12 papyrological documents relative to slavery in Graeco-Roman Egypt (text, critical apparatus, translation, bibliography).

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See detailL'Egypte hors d'Egypte: deux mille ans d'égyptomanie en Europe et ailleurs
Winand, Jean ULg

Conference given outside the academic context (2006)

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See detailL'Egypte imaginaire : de la Renaissance à Champollion
Droixhe, Daniel ULg; Grell, Chantal

Book published by Presses de l'Université Paris-Sorbonne (2001)

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See detailL’Égypte médicale de Pline l’Ancien
Marganne, Marie-Hélène ULg

in Sabbah, Guy (Ed.) Le latin médical. La constitution d’un langage scientifique (1991)

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See detailL'Égypte pharaonique
Laboury, Dimitri ULg

Book published by Le Cavalier Bleu éditions (2001)

Étant donné la place exceptionnelle dont elle jouit dans l'imaginaire collectif occidental depuis près de 4.000 ans, l'Égypte pharaonique est de nos jours l'objet de nombreuses idées reçues, qui, pour la ... [more ▼]

Étant donné la place exceptionnelle dont elle jouit dans l'imaginaire collectif occidental depuis près de 4.000 ans, l'Égypte pharaonique est de nos jours l'objet de nombreuses idées reçues, qui, pour la plupart, remontent à l'Antiquité. L'examen que l'ouvrage propose des principales idées reçues générées par notre société à propos de l'Égypte antique vise à constituer un éveil autant à l'Égyptologie, à l'étude de ce que fut réellement la civilisation pharaonique, qu'à la manière dont celle-ci fut récupérée, exploitée et parfois déformée par notre système culturel, à ce que l'on appelle en Histoire la réception culturelle de l'Égypte. [less ▲]

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See detailL'Égyptien et la Mort. Rotes et croyances funéraires dans l'Égypte pharaonique
Laboury, Dimitri ULg

in Warmenbol, Eugène (Ed.) Ombres d'Égypte. Le peuple de Pharaon. Catalogue de l'exposition créée au Musée du Malgré-Tout à Treignes (Belgique) du 20 juin au 12 décembre 1999 (1999)

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See detailEHBT: An efficient protocol for group key management
Rafaeli, S.; Mathy, Laurent ULg; Hutchison, D.

in LNCS 2233 (2001)

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See detailEHEC dialogue with eucaryotic cells
Mainil, Jacques ULg

Conference (2007)

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See detailEHF and IHS: two complementary bodies
Schoenen, Jean ULg

in Ekbom, K. (Ed.) Migraine in General Practice: basic concepts (1993)

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See detailEhlers-Danlos syndrome type VIII: a rare cause of leg ulcers in young patients.
Ronceray, Sophie; Miquel, J.; Lucas, A. et al

in Case Reports in Dermatological Medicine (2013), 2013

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See detailEhlers-Danlos syndrome.
Hermanns-Lê, Trinh ULg; REGINSTER, Marie-Annick ULg; Franchimont, Claudine ULg et al

in Stirling, J; Curry, A; Eyden, B (Eds.) Diagnostic electron microscopy (2013)

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See detailEhlers-Danlos-like dermal abnormalities in women with recurrent preterm premature rupture of fetal membranes.
Hermanns-Lê, Trinh ULg; Pierard, Gérald ULg; Quatresooz, Pascale ULg

in American Journal of Dermatopathology (2005), 27(5), 407-10

Preterm premature rupture of membranes (PPROM) likely results from weakening of the constituent connective tissue. It is uncertain if the alterations are limited to the fetal membranes or are also present ... [more ▼]

Preterm premature rupture of membranes (PPROM) likely results from weakening of the constituent connective tissue. It is uncertain if the alterations are limited to the fetal membranes or are also present in other sites such as the skin. The aim of the study was to compare the dermal structure of women suffering from recurrent PPROM with the dermis of both non-pregnant women and women with uneventful gestation. Skin biopsies were taken from 42 women who recently underwent PPROM, 33 women with uneventful gestation and 33 non-pregnant women. Histochemistry, immunohistochemistry, and electron microscopy were performed on these specimens and analyzed blindly. Morphologic changes were found in the dermis of most (33 of 42 at optical microscopy and 40 of 42 at ultrastructure) of the women suffering from PPROM. They were reminiscent of those found in some types of Ehlers-Danlos Syndrome (EDS). However, there was no clinical evidence suggesting a recognized form of EDS. We conclude that some cases of PPROM are a systemic connective tissue disorder representing a yet unidentified type of EDS. [less ▲]

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See detailEigenproblem formulation for electromechanical microsystem pull-in voltage optimization
Lemaire, Etienne ULg; Van Miegroet, Laurent ULg; Tromme, Emmanuel ULg et al

Conference (2013)

Electrostatic actuators are often used in MEMS since they are relatively easy to manufacture and provide a short response time. Previous studies have already considered topology optimization of such micro ... [more ▼]

Electrostatic actuators are often used in MEMS since they are relatively easy to manufacture and provide a short response time. Previous studies have already considered topology optimization of such micro-actuators like the work by Raulli and Maute [1] and by Yoon and Sigmund [2]. Raulli considers maximization of the actuator output displacement for given electric potential input locations. The paper by Yoon et al. goes further by replacing the staggered modeling used by Raulli by a monolithic approach where both physical fields (electric and mechanical) are solved at once. However, electrostatic micro-actuators possess a limit input voltage called the pull-in voltage, beyond which they become unstable. If a voltage greater than the pull-in voltage is applied to the device, elastic forces of the suspension system are not able to balance electrostatic forces and electrodes stick together. In some cases, the pull-in effect can damage the device. Previous researches by the authors [3] have considered the possibility to control pull-in voltage using topology optimization. In this first approach, pull-in voltage itself was included in the optimization problem and treated as objective function. Nevertheless, in some applications, the developed pull-in voltage optimization procedure suffers from design oscillations that prevent from reaching solution. As illustrated in this paper, the issue is similar to the mode switching problem that arises in eigenvalue optimization problems. The classical solution to this issue consists in including several eigenvalues in a ‘max-min’ formulation. However as the classical pull-in voltage optimization problem is not formulated as an eigenproblem, direct application is not possible. Indeed, pull-in being a nonlinear instability phenomenon, strictly speaking, it is only possible to compute one instability mode and upcoming instability modes cannot be captured. Therefore, this paper is dedicated to the development of a linear eigenproblem approximation for the nonlinear stability problem after the work on nonlinear buckling by Lindgaard and Lund [4]. The proposed stability eigenproblem leads to an alternative optimization procedure aiming at maximizing pull-in voltage. The first eigenmode corresponds to the actual pull-in mode while higher order modes allow estimating upcoming instability modes. Using a multiobjective formulation to maximize the smallest eigenvalue of the stability problem, it is possible to circumvent oscillation issues met with pull-in voltage optimization. Moreover, numerical results show that even if the eigenproblem formulation is an approximation of the actual pull-in voltage optimization problem, eigenproblem formulation leads to significant improvement of pull-in voltage. References [1] M. Raulli and K. Maute, Topology optimization of electrostatically actuated Microsystems, Struct. & Mult. Opt., 30(5):342-359, November 2005. [2] G.H. Yoon and O. Sigmund, A monolithic approach for topology optimization of electrostatically actuated devices, Comput. Methods Appl. Mech. Engrg., 194:4062-4075, 2008. [3] E. Lemaire, V. Rochus, J.-C. Golinval, and P. Duysinx, Microbeam pull-in voltage topology optimization including material deposition constraint, Comput. Methods Appl. Mech. Engrg., 194:4040-4050, 2008. [4] E. Lindgaard and E. Lund, Nonlinear bucking optimization of composite structures, Comput. Methods Appl. Mech. Engrg., 199:37-40, 2010. [less ▲]

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See detailEigenschappen van glucosamine
Reginster, Jean-Yves ULg; Halkin, V

in Medi-Sfeer (2000), 116

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See detailEigenvector-based approach to neutrino mixing
Aristizabal Sierra, Diego ULg; Houet, Eric; Ivo, Medeiros Varzielas

in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2013), 87

We propose a model-independent analysis of the neutrino mass matrix through an expansion in terms of the eigenvectors defining the lepton mixing matrix, which we show can be parametrized as small ... [more ▼]

We propose a model-independent analysis of the neutrino mass matrix through an expansion in terms of the eigenvectors defining the lepton mixing matrix, which we show can be parametrized as small perturbations of the tribimaximal mixing eigenvectors. This approach proves to be powerful and convenient for some aspects of lepton mixing, in particular when studying the sensitivity of the mass matrix elements to departures from their tribimaximal form. In terms of the eigenvector decomposition, the neutrino mass matrix can be understood as originating from a tribimaximal dominant structure with small departures determined by data. By implementing this approach to cases when the neutrino masses originate from different mechanisms, we show that the experimentally observed structure arises very naturally. We thus claim that the observed deviations from the tribimaximal mixing pattern might be interpreted as a possible hint of a ``hybrid'' nature of the neutrino mass matrix. [less ▲]

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