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See detailEhlers-Danlos syndrome.
HERMANNS-LE THI KIM, 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-Le, 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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See detailEight years of denosumab treatment in postmenopausal women with osteoporosis: results from the first five years of the freedom extension
Papapoulos, S; Lippuner, K; Roux, C et al

in Osteoporosis International (2014), 25(2), 46-47

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See detailEin Devon/Karbon-Grenzprofil im Untergrund Der Niederrheinischen Bucht Bei Krefeld.
Bless, M.J.M.; Brauckmann, C.; Conil, R. et al

in Fortschr. Geol. Rheinld. U. Westf (1998), 37

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See detailEin erhabener Affekt. Passions, émotions et raison chez Kant
Bolmain, Thomas ULg

Scientific conference (2009, April 03)

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See detailDas Eine und die Vielen in Neuägyptischen
Winand, Jean ULg

Scientific conference (1990, January 30)

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See detailEinfluss der Medienwelt auf vier moderne Kurzprosatexte. Versuch einer Deutung
Simons, Germain ULg

Master's dissertation (1988)

Ce mémoire analyse l'influence du monde des médias sur quatre "Kurzgeschichten" :"Paula" (1980) de E. Jelinek ; "Ein Pferd wird erschossen" (1982) de H. C. Buch ; "Wie ich lebe" (1979) de F. Hohler ; "Die ... [more ▼]

Ce mémoire analyse l'influence du monde des médias sur quatre "Kurzgeschichten" :"Paula" (1980) de E. Jelinek ; "Ein Pferd wird erschossen" (1982) de H. C. Buch ; "Wie ich lebe" (1979) de F. Hohler ; "Die Namen" (1979) de G. Neumann. [less ▲]

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See detailDer Einfluss von Imperfektionen in dünnwandigen geschweiBten Rechteckquerschnitten unter Druckbeanspruchung
Degée, Hervé ULg; Kuhlmann, U.; Detzel, A. et al

in Stahlbau (2008), 77(4), 257-265

This contribution presents the results of a research projects analysing some aspects of stability failure of thin-walled RHS compression members that are likely to exhibit combined global and local ... [more ▼]

This contribution presents the results of a research projects analysing some aspects of stability failure of thin-walled RHS compression members that are likely to exhibit combined global and local buckling. In particular the influence of various imperfections, namely residual stresses due to welding and local as well as global geometrical defects, on the load-carrying capacity is subjected to detailed experimental and numerical investigations. The insight into the structural behaviour leads to recommendations for standardized imperfections that should be used in the context of the numerical modelling of class-4 square and rectangular hollow section members subjected to compression. [less ▲]

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See detailEinführung
Küpper, Achim ULg

Scientific conference (2011, April 02)

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See detailEinführung
Küpper, Achim ULg

Scientific conference (2010, February 24)

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