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See detailFlexible multibody system modelling: A geometric local frame approach on SE(3)
Sonneville, Valentin ULiege

Scientific conference (2015, October 30)

In order to improve computational costs in the frame of flexible multibody system modelling, we propose a geometrically exact framework relying on a local frame description. Thanks to this framework ... [more ▼]

In order to improve computational costs in the frame of flexible multibody system modelling, we propose a geometrically exact framework relying on a local frame description. Thanks to this framework, geometric non-linearities are strongly reduced for two reasons. Firstly, the equations of motion can be solved without introducing a global parametrization of the motion, which also leads to a naturally singularity-free description of large rotations. Secondly, the equations of motion are expressed in a local frame, both at position and rotation level, leading to intrinsic equations. Accordingly, these equations are insensitive to large amplitude motions, such that the geometric non-linearities are naturally filtered. The mathematical developments are carried out in a Lie group setting which, albeit more abstract than classical treatments, provides generic and powerful well established tools. So far, several elements have been formulated in this framework: rigid body, kinematic joints and a flexible beam finite element. A shell finite element and a super-element are also under development. Some interesting numerical advantages are observed following the reduction of geometric non-linearities, e.g., the iteration matrix depends on relative motion within the elements only and is thus invariant under rigid body motions. [less ▲]

Detailed reference viewed: 126 (18 ULiège)
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See detailFlexible Technique for Multiple Organ Procurement in Rats: A Training and Research Tool in Transplantation
D'Silva, M.; Pirenne, J.; Bonnet, Pierre ULiege et al

in Microsurgery (1993), 14(5), 342-9

Multiple organ procurement techniques are increasingly popular in many transplant centers. This paper describes a technique for multiorgan unit(s) explantation in rats. The procedure involves in situ ... [more ▼]

Multiple organ procurement techniques are increasingly popular in many transplant centers. This paper describes a technique for multiorgan unit(s) explantation in rats. The procedure involves in situ preliminary dissection, cold perfusion of the thoracic and abdominal organ units as separate procedures, explantation, and finally the ex situ isolation of various organ units as single and/or multiple organ combination units. The procedure is feasible, allows for flexibility in the separation of combination organ units, and is reproducible. The exercise is provided as a training and research tool for clinical and research transplant surgeons. The technique is also presented as an animal model for clinical organ sharing. [less ▲]

Detailed reference viewed: 35 (0 ULiège)
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See detailFlexible transparent conductive materials based on silver nanowire networks: a review
Langley, Daniel ULiege; Giusti, Gael; Mayousse, Céline et al

in Nanotechnology (2013), 24(45), 452001

The class of materials combining high electrical or thermal conductivity, optical transparency and flexibility is crucial for the development of many future electronic and optoelectronic devices. Silver ... [more ▼]

The class of materials combining high electrical or thermal conductivity, optical transparency and flexibility is crucial for the development of many future electronic and optoelectronic devices. Silver nanowire networks show very promising results and represent a viable alternative to the commonly used, scarce and brittle indium tin oxide. The science and technology research of such networks are reviewed to provide a better understanding of the physical and chemical properties of this nanowire-based material while opening attractive new applications. [less ▲]

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See detailFlexible Transparent Electrodes based on Silver Nanowire Networks: Nanoscale Characterisation, Electrical Percolation, and Integration into Devices
Sannicolo, T.; Lagrange, M.; Xian, S. et al

Conference (2016, September)

The most efficient and widely used transparent conducting material (TCM) is currently indium tin oxide (ITO). However the indium scarcity associated to the lack of flexibility of ITO as well as relatively ... [more ▼]

The most efficient and widely used transparent conducting material (TCM) is currently indium tin oxide (ITO). However the indium scarcity associated to the lack of flexibility of ITO as well as relatively high cost of fabrication has prompted the search for alternative low cost and flexible materials. Among emerging transparent electrodes (TEs), silver nanowire (AgNW) networks appear as a promising substitute to ITO since these percolating networks exhibit high flexibility and excellent optoelectronic properties [1], with sheet resistance of a few Ω/sq and optical transparency of 90%, fulfilling the requirements for many applications such as solar cells, OLED displays, transparent heaters, or radio-frequency (RF) antennas and transparent shielding [2]. In addition, the fabrication of these electrodes involves low-temperature process steps and upscaling methods, thus making them very appropriate for future use as TE for flexible devices. Our research is focused on the fundamental understanding of the physical phenomena taking place at the scales of both the network (macroscale) and the NW-to- NW junctions (nanoscale), and on the ability of AgNW networks to be integrated as transparent electrodes for flexible optoelectronic and RF devices. In-situ electrical measurements performed during optimisation process such as thermal annealing and/or chemical treatments provide useful information regarding the activation process of the junctions [3]. Besides, nano-characterisation techniques such as Transmission Electron Microscopy (TEM) and ultramicrotomy help visualizing the physical phenomena involved in the diffusion of silver atoms to create well-sintered junctions. At the network’s scale, our ability to distinguish the nanowires taking part in the electrical conduction (“electrical percolating pathways”) from the inactive nanowires is a critical issue for the applications. By combining experimental and simulation studies, a discrete activation process of efficient percolating pathways through the network was evidenced. In the case where the network density is close to the percolation threshold and when low voltage is applied, individual “illuminated” pathways can be detected through the network while new branches get activated as soon as the voltage is increased. Here we will present our results on the study of AgNW networks at the macro and nano scales described above and will correlate it with the overall performance/characteristics of the networks. We will also present results on the integration of optimized AgNW networks into functional devices. [1] D.P. Langley, G. Giusti, C. Mayousse, C. Celle, D. Bellet, J.-P. Simonato, Nanotechnology, 24, 452001, (2013). [2] C. Celle, C. Mayousse, E. Moreau, H. Basti, A. Carella and J.-P. Simonato, Nano Res. 5, 427, (2012). [3] M. Lagrange, D.P. Langley, G. Giusti, C. Jimenez, Y. Bréchet, D. Bellet, Nanoscale 7, 17410, (2015). [less ▲]

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See detailA flexible two-step randomised response model for estimating the proportions of individuals with sensitive attributes
Donneau, Anne-Françoise ULiege; Mauer, M; Sartor, F et al

Conference (2004, October)

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See detailA flexible yield and management model for spruce in belgian Ardennes
Rondeux, Jacques ULiege

in Wright, H. (Ed.) Planning, performance and evaluation of growth and yield studies (1983)

This paper describes the construction of a simulation model for intensive management of even)aged stands of spruce (Picea abies Karst). The model differs from many others in the way it attempts to reach ... [more ▼]

This paper describes the construction of a simulation model for intensive management of even)aged stands of spruce (Picea abies Karst). The model differs from many others in the way it attempts to reach predetermined objectives fixed by the manager. It starts from stand constraints issued from inventories (number of stems, mean diameter, dominant height, age) and silvicultural constraints (annual diameter increment, rotation age, thinning cycle, thinning type). A computer program using the principles of numerical thinnings has been developed to calculate at different ages : the removed material (number of stems and basal area per hectare, mean diameter, etc.) and material of the main stand (number of stems and basal area per hectare, mean diameter before and after thinning, etc.). [less ▲]

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See detailLa Flexicurité : entre normativité et opérationnalisation
Xhauflair, Virginie ULiege; Pichault, François ULiege

Conference (2007, March)

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See detailLa flexicurité : une politique des idées ? Regards croisés d’acteurs institutionnels belges en 2013
Beuker, Laura ULiege; Gérard, Julie ULiege; Orianne, Jean-François ULiege

in Revue Belge de Sécurité Sociale (2014), 1

Cette recherche porte sur la traduction, en Belgique, d’une politique européenne de l’emploi – la flexicurité – par différents acteurs institutionnels. À partir d’une analyse documentaire et d’une ... [more ▼]

Cette recherche porte sur la traduction, en Belgique, d’une politique européenne de l’emploi – la flexicurité – par différents acteurs institutionnels. À partir d’une analyse documentaire et d’une vingtaine d’entretiens semi-directifs, nous étudierons la manière dont ces acteurs s’approprient et interprètent la flexicurité. Nous nous appuierons principalement sur les apports récents de la sociologie de l’action publique, en particulier l’approche cognitive des politiques publiques (Surel, 2000 ; Muller et Surel, 1998) et l’européanisation des politiques d’emploi (Palier et Surel, 2007 ; 2010). Nous montrerons que cette appropriation a donné lieu, en Belgique, à une transformation du sens conféré à la sécurité, dorénavant assimilée à de la flexibilité. [less ▲]

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See detailLa flexicurité : vers une carrière transitionnelle?
Beuker, Laura ULiege

Conference (2014, July)

Ces dernières années, les institutions Européennes ont joué un rôle clé dans la régulation et l’orientation des politiques publiques pour l’emploi des États-membres (Amparo-Serrano et Martin-Martin, 2012 ... [more ▼]

Ces dernières années, les institutions Européennes ont joué un rôle clé dans la régulation et l’orientation des politiques publiques pour l’emploi des États-membres (Amparo-Serrano et Martin-Martin, 2012). Dans ce cadre, la flexicurité s’est imposée comme une référence des politiques en matière de droit du travail, d’emploi, de sécurité sociale et de formation professionnelle (Conter et Orianne, 2011). En Belgique, cette exigence d’allier flexibilité et sécurité sur le marché du travail a constitué le cœur de nombreux discours et programmes politiques, pour finir par s’estomper progressivement, à la suite de crises financières et économiques l’ayant fortement éprouvé. Ce « concept » a-t-il pour autant effectivement disparu ? À partir d’une étude qualitative basée sur des entretiens semi-directifs menés auprès d’acteurs institutionnels – experts et analystes du marché du travail – nous nous sommes rendu compte que si la sémantique n’est plus, les principes de flexicurité sont, quant à eux, toujours présents dans le discours des individus. De plus, ces principes semblent détenir une portée normative de taille quant à la redéfinition de l’articulation des temporalités sociales : d’une sécurité de l’emploi, nous serions en train d’effectuer un glissement vers une sécurité en emploi de l’individu. La rhétorique n’est pas innocente : désormais, ce n’est plus tant l’individu qu’il s’agit de protéger (droit du travail, etc.) mais bien les transitions – multiples et sinueuses – opérées par ce dernier. Pour y parvenir, l’État le responsabilise : il doit désormais être capable de se prendre en mains : « c’est le passage d’un ‘État qui protège’ à un ‘État qui rend capable’ » (Vrancken, 2008). [less ▲]

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See detailLa flexicurité et la formation des demandeurs d’emploi : les politiques wallonnes à l'aune de l’approche par les capacités.
Conter, Bernard; Orianne, Jean-François ULiege

in Formation Emploi : Revue Française de Sciences Sociales (2011), 113

Detailed reference viewed: 122 (26 ULiège)
See detailLa flexicurité revisitée : analyse qualitative interdisciplinaire du discours de travailleurs à l'aide d'un logiciel collaboratif »
Beuker, Laura ULiege; DE CIA, Julie ULiege; Orianne, Jean-François ULiege et al

Conference (2015, June 17)

La flexicurité constitue un oxymore qui prône la recherche d’un équilibre entre besoins de flexibilité et de sécurité sur le marché du travail. Cet équilibre est avant tout un objectif politique, mais il ... [more ▼]

La flexicurité constitue un oxymore qui prône la recherche d’un équilibre entre besoins de flexibilité et de sécurité sur le marché du travail. Cet équilibre est avant tout un objectif politique, mais il reste fragile aux yeux des acteurs concernés. En cherchant à croiser le regard analytique de trois disciplines – psychologie, gestion et sociologie –, nous avons recouru au logiciel Cassandre (Lejeune, 2008) pour dégager des tensions discursives autour des notions de flexibilité et de sécurité dans un corpus de vingt entretiens qualitatifs. L’article permet ainsi de concrétiser l’intérêt et les limites de l’utilisation d’un logiciel d’analyse qualitative dans le cadre d’un travail interdisciplinaire. [less ▲]

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See detailLa Flexicurité revisitée à l’aune des pratiques effectives
Xhauflair, Virginie ULiege; Pichault, François ULiege

Conference (2007, September)

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See detailFlexihealth : une méthodologie d'évaluation du stress en situation de changement
De Zanet, Fabrice ULiege; Vandenberghe, C.; Bossut, Muriel ULiege et al

in Médecine du Travail & Ergonomie= Arbeidsgezondheidszorg & Ergonomie (2002), 39(2), 82-83

Detailed reference viewed: 128 (10 ULiège)
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See detailThe Flexihealth project: combining the competing demands of flexibility practices and employee health.
Vandenberghe, Christian; De Zanet, Fabrice ULiege; Demez, G. et al

Conference (2001, May 19)

Detailed reference viewed: 15 (3 ULiège)
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See detail'Flexihealth', un nécessaire équilibre entre contraintes de flexibilité et bine-être des travailleurs
De Zanet, Fabrice ULiege; Vandenberghe, Christian; Bossut, Muriel ULiege et al

in Point d'appui T E F (2000), 2

Detailed reference viewed: 42 (7 ULiège)
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See detailFlexion et extension des plaques d'épaisseurs modérés
Fraeijs de Veubeke, Baudouin ULiege

in Mémoires - Académie royale de Belgique, Classe des Lettres et des Sciences Morales et Politiques. Collection in-8 (1959), 31(6), 18

Detailed reference viewed: 8 (0 ULiège)
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See detailFlexural Buckling of Axially Loaded Ferritic Stainless Steel Columns in case of Fire
Lopes, N.; Vila Real P.M.M.; Simoes da Silva, L. et al

in Ofner (Ed.) Proceedings of the 5th European Conference on Steel and Composite Structures (EUROSTEEL 2008) (2008)

Detailed reference viewed: 55 (3 ULiège)