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See detailThe Lactoperoxydase System, a natural and biological control of potato late blight
Bafort, Françoise ULg; Jijakli, Haissam ULg; Perraudin, Jean-Paul

Conference (2012, June 27)

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See detailThe Lactoperoxydase System, a soft chemical method to control of potato late blight
Bafort, Françoise ULg; Jijakli, Haissam ULg; Perraudin, Jean-Paul

Poster (2012, May 07)

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See detailLe lactosérum en alimentation porcine
Boudry, Christelle ULg; Maquet, Pierre; Montfort, Elise

Article for general public (2012)

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See detailLacunarity, fractal, and magnetic transition behaviors in a generalized Eden growth-process
Vandewalle, Nicolas ULg; Ausloos, Marcel ULg

in Physical Review. E : Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics (1994), 50(2), 635-638

The effect of an internal extra degree of freedom introduced into the simplest growth model (the Eden model) leads to a joint physical and geometrical transition. Lacunarity, fractal, and magnetic ... [more ▼]

The effect of an internal extra degree of freedom introduced into the simplest growth model (the Eden model) leads to a joint physical and geometrical transition. Lacunarity, fractal, and magnetic transitions are indeed reported to be at the same critical values of the growth parameters. A logarithmic behavior of the cluster mass on this critical value was found. [less ▲]

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See detailLacunary wavelet series on Cantor sets
Esser, Céline ULg

E-print/Working paper (2015)

We construct functions with prescribed multifractal spectra which satisfy the leaders profile method.

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See detailEen lacune gevuld. Edward Vanhouttes editie van De moerbeitoppen ruischten
Spinoy, Erik ULg

in Internationale Neerlandistiek (2012), 50(3), 276-279

This is a review of a new scholarly edition of the first volume of poetry published by the Flemish poet Anton van Wilderode.

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See detailLacunes extrinsèques et effets au contentieux préjudiciel : lorsque la Cour de cassation fait d'une pierre deux coups
Pironnet, Quentin ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2016), 35(2016), 1652-1658

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See detailLacustrine record of Late Pleistocene and Holocene climate evolution, volcanism and seismic activity in Lake Puyehue (Chilean Lake District)
De Batist, M.; Fagel, Nathalie ULg; Loutre, M. F. et al

Book published by Journal of Paleolimnology (2008)

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See detailLaddering melanotic pattern of Langer's lines in skin of colour.
Quatresooz, Pascale ULg; Hermanns, Jean-Francois; Hermanns-Lê, Trinh ULg et al

in European Journal of Dermatology (2008), 18(5), 575-8

Mechanobiological stimulation of the skin influences melanocyte activity. The clinical impact on melanocytes can be perceived by dermoscopy. Our aim was to assess the orientation of Langer's lines using ... [more ▼]

Mechanobiological stimulation of the skin influences melanocyte activity. The clinical impact on melanocytes can be perceived by dermoscopy. Our aim was to assess the orientation of Langer's lines using the combination of ultrasound shear wave propagation and dermoscopy in 70 adults of darker skin complexion. On the back, 44/70 patients showed a honeycomb melanotic pattern without any main orientation. By contrast, a streaky parallel pattern of melanotic lines oriented in the direction of Langer's lines was found in 26/70 patients. Indeed, the maximum speed of ultrasound propagation was found parallel to the main orientation of the laddering melanotic pattern. The parallel melanotic pattern probably reflects the main orientation of the epidermal rete ridges aligned in the direction of Langer's lines. This aspect could be ascribed to the deepening of these structures and/or to mechanobiology affecting melanocytes. The aspect is reminiscent of that previously described in striae distensae and atrophic scars. [less ▲]

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See detailLAECEA : un outil fédérateur d’aide à la décision pour le suivi de la santé mammaire dans les élevages bovins laitiers wallons
Reding, Edouard; Theron, Léonard ULg; Detilleux, Johann ULg et al

in 18èmes rencontres autour de la recherche sur les ruminants (2011, December)

La santé mammaire représente un des principaux problèmes pour l’élevage laitier. Dans le cadre de la plateforme fédératrice OSaM (Observatoire de la Santé Mammaire), le projet LAECEA (AWE–ULg) vise à la ... [more ▼]

La santé mammaire représente un des principaux problèmes pour l’élevage laitier. Dans le cadre de la plateforme fédératrice OSaM (Observatoire de la Santé Mammaire), le projet LAECEA (AWE–ULg) vise à la construction d’une base de données de la santé mammaire centralisant les informations collectées par les associations de la filière laitière wallonne ainsi que les données cliniques encodées par les éleveurs. De plus, ce projet souhaite mettre à disposition un Dossier de Santé Mammaire (DSM) mensuel permettant à l’éleveur d’évaluer l’impact économique des mammites et de cibler, avec son vétérinaire, la stratégie à mettre en place afin de le diminuer grâce à différents indicateurs ciblés. Dans le but de bénéficier des données du tank (Comité du Lait), des résultats d’analyse bactériologiques (ARSIA, Association Régionale de Santé et d’Identification Animale), et des données zootechniques (AWE), une base de données fédératrice a été mise en place. Afin d’enrichir celle-ci en données cliniques, un nouvel outil de saisie des pathologies en ligne a été créé et mis à la disposition des éleveurs dans leur espace Internet personnalisé my@wenet (www.awenet.be). Ils peuvent y saisir les informations relatives aux évènements de la santé mammaire (date, type d’évènement, quartier, sévérité…) et au(x) traitement(s) qui y est/sont associé(s). Sur les six premiers mois, près de 750 mammites ont été collectées. Les données récupérées dans les historiques en fermes portent ce chiffre à 2300. Les valorisations tirées de ces données sont rassemblées dans le DSM. Celui-ci est composé d’une page récapitulative dont certains aspects sont détaillés à travers différentes rubriques : évaluation économique (déjà disponible), microbisme et traitements, et management (en cours d’élaboration). Ce DSM permet notamment de quantifier la perte économique due à la santé mammaire, de quantifier le nombre de vaches à problèmes tant cliniques que subcliniques, de décrire la dynamique des infections mammaires au niveau du troupeau, d’identifier les groupes d’animaux les plus sensibles, d’identifier les principaux pathogènes impliqués, d’évaluer la qualité de la détection des mammites, de cibler les périodes de l’année et de la lactation les plus à risques. Une analyse statistique préliminaire sur les indicateurs générés dans les 201 premiers DSM confirment l’intérêt de la réussite du traitement au tarissement sur la santé mammaire de l’exploitation. De plus, cette investigation appuie la pertinence de l’approche économique partielle comme indicateur de santé mammaire global. [less ▲]

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See detailDie Lage der Deutschsprachigen Gemeinschaft nach der 6. Staatsreform
Behrendt, Christian ULg

Conference given outside the academic context (2016)

Conférence donnée au Rotary Eifel, à Crombach, 21 janvier 2016

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See detailLagos calling: Nollywood e la reinvenzione del cinema in Africa
Jedlowski, Alessandro ULg

Book published by Aracne (2015)

Nel corso degli ultimi vent’anni, grazie all’introduzione di nuove tecnologie e alla trasformazione del contesto economico e politico locale, la Nigeria ha visto la propria industria cinematografica ... [more ▼]

Nel corso degli ultimi vent’anni, grazie all’introduzione di nuove tecnologie e alla trasformazione del contesto economico e politico locale, la Nigeria ha visto la propria industria cinematografica Nollywood divenire una delle più grandi del mondo. La sua emergenza ha trasformato il panorama della produzione cinematografica africana creando nuovi spazi di espressione, nuove forme di imprenditoria e nuovi modelli culturali, e dando vita, forse per la prima volta nella storia, ad un fenomeno culturale di massa su scala continentale. I saggi che compongono questa raccolta propongono una panoramica sul dibattito accademico che la nascita di Nollywood ha provocato, offrendo diversi spunti teorici ed etnografici per ragionare sulla produzione cinematografica in contesto postcoloniale. Contributi di: Abdalla Uba Adamu, Anouk Batard, Jean-Paul Colleyn, Jonathan Haynes Alessandro Jedlowski, MatthiasKrings, BirgitMeyer, Sara Pahor, KatrienPype, IkechukwuObiaya Giovanna Santanera [less ▲]

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See detailLagrangian and Arbitrary Lagrangian Eulerian Simulations of Complex Roll Forming Processes
Crutzen, Yanick ULg; Boman, Romain ULg; Papeleux, Luc ULg et al

Conference (2015, July)

Finite element simulation of the roll forming process is regarded as an essential tool for the early design and optimization stages of a roll forming mill. However, such simulations are generally ... [more ▼]

Finite element simulation of the roll forming process is regarded as an essential tool for the early design and optimization stages of a roll forming mill. However, such simulations are generally incredibly time-consuming, limited to some simple cases and to the pre-cut forming method. In contrast to the classical Lagrangian approach, the Arbitrary Lagrangian Eulerian (ALE) formalism, which consists in decoupling the motion of the material and the mesh, can simulate the continuous process for the entire roll forming line at reasonable CPU cost by using a nearly-stationary mesh. In this work, the numerical results are compared to some experimental data on a U-channel in order to validate both Lagrangian and ALE models using our in-house code METAFOR. Furthermore, advantages of the ALE formalism are highlighted with the simulation of a tubular rocker panel on a 16-stand forming mill, which is a real industrial mill. [less ▲]

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See detailLagrangian and arbitrary Lagrangian Eulerian simulations of complex roll-forming processes
Crutzen, Yanick ULg; Boman, Romain ULg; Papeleux, Luc ULg et al

in Comptes Rendus Mécanique (2016), 344(4-5), 251-266

The Arbitrary Lagrangian Eulerian (ALE) formalism is a breakthrough technique in the numerical simulation of the continuous-type roll-forming process. In contrast to the classical Lagrangian approach, the ... [more ▼]

The Arbitrary Lagrangian Eulerian (ALE) formalism is a breakthrough technique in the numerical simulation of the continuous-type roll-forming process. In contrast to the classical Lagrangian approach, the ALE formalism can compute the hopefully stationary state for the entire mill length with definitely effortless set-up tasks thanks to a nearly-stationary mesh. In this paper, advantages of ALE and Lagrangian formalisms are extensively discussed for simulating such continuous-type processes. Through a highly complex industrial application, the ease of use of ALE modelling is illustrated with the in-house code METAFOR. ALE and Lagrangian results are in good agreement with each other. [less ▲]

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See detailLagrangian and Arbitrary Lagrangian Eulerian Simulations of Stationary and Non-Stationary Roll Forming Processes
Crutzen, Yanick ULg; Boman, Romain ULg; Papeleux, Luc ULg et al

Conference (2014, September)

In industry, cold roll forming is more and more used as a manufacturing process mainly for its high productivity and its close geometric tolerances. However, most of the finite element simulations are ... [more ▼]

In industry, cold roll forming is more and more used as a manufacturing process mainly for its high productivity and its close geometric tolerances. However, most of the finite element simulations are restricted to the sheet to sheet process - the sheet length being smaller than the whole roll forming line - because the numerical models rely on a Lagrangian kinematics that is not very well suited for the forming of long sheets in a reasonable computational time. The Arbitrary Lagrangian Eulerian (ALE) formalism, which consists in decoupling the motion of the material and the mesh, has the capability to simulate the continuous process for the whole roll forming line at reduced CPU cost by optimization of the mesh. In the particular case of roll forming, the mesh nodes are fixed in the rolling direction but are free to move in transverse directions. Taking advantage from this approach, the mesh is only refined in the neighbourhoods of the forming tools for accurate modeling of contact and bending. [less ▲]

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See detailLagrangian simulations of penetration environments via mesh healing and adaptative optimisation
Mauch, Sean; Noels, Ludovic ULg; Zhao, Zizu et al

(2006)

In this work, we demonstrate the feasibility of fully-Lagrangian finite element simulations of the mechanics of three-dimensional penetration environments. The key enabling component is a robust library ... [more ▼]

In this work, we demonstrate the feasibility of fully-Lagrangian finite element simulations of the mechanics of three-dimensional penetration environments. The key enabling component is a robust library informed with state-of-the-art algorithms for mesh healing and optimization, which is repeatedly used during the simulations to eliminate deformation-induced mesh distortion and to maintain the quality of the numerical solution. The computational strategy effectively avoids the need to resort to artifacts such as element deletion or conversion to meshless particles which have been proposed to eliminate the issue of mesh distortion. The effectiveness of the computational strategy is demonstrated in a simulation of deep oblique penetration of a spherical-nosed steel rod on an aluminum target. [less ▲]

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See detailLagrangian simulations of polymer drag reduction
Terrapon, Vincent ULg

Conference (2004, November)

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See detailLagrangian simulations of turbulent drag reduction by a dilute solution of polymers in a channel flow
Terrapon, Vincent ULg

Doctoral thesis (2005)

Much progress in understanding the phenomenon of turbulent drag reduction by polymer additives has been made since its first experimental observation. While the use of direct numerical simulations has ... [more ▼]

Much progress in understanding the phenomenon of turbulent drag reduction by polymer additives has been made since its first experimental observation. While the use of direct numerical simulations has achieved significant success and dramatically improved our understanding of the mechanisms associated with polymer drag reduction, a conclusive explanation of the physics associated with the phenomenon is still lacking. In particular, the stretching and relaxation mechanisms of individual polymer molecules are still unclear since the numerical simulations have relied on a continuum approach to compute the polymer quantities, i.e., solving a constitutive equation in an Eulerian frame of reference. Moreover, the accuracy of these simulations is limited by their need for artificial dissipation to stabilize the simulations. To overcome these difficulties, one can simulate the polymer phase in a Lagrangian framework, which is well suited for solving the hyperbolic polymer equations. The Lagrangian approach is characterized by tracking a large number of polymer molecules in the turbulent flow and computing the polymer stresses along their trajectories. This allows an exact description of the dynamics of single molecules and avoids any explicit artificial diffusion—a great advantage over the previous techniques. As a first step, this work attempts to uncover the mechanisms of polymer stretching in turbulent flows using various polymer models with realistic parameters. A topological methodology is applied to characterize the ability of the flow to stretch the polymers. It is found, using conditional statistics, that highly stretched polymer molecules have experienced a strong biaxial extensional flow between quasi-streamwise vortices in the near-wall regions. The extended polymers then relax in regions where the flow is mainly rotational located in and around the quasi-streamwise vortices. In the second step, a novel numerical method is developed based on a Lagrangian approach to simulate drag reduction. This new method reproduces well all the characteristic features of drag-reduced flows. However, a large discrepancy between Eulerian and Lagrangian calculations is found in flows with limited drag reduction. The Eulerian simulations show a much larger mean extension and damp the small scales. However, when the amount of drag reduction is increased, this discrepancy reduces. [less ▲]

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See detailLagrangians for Damped Linear Multi-Degree-of-Freedom Systems
Udwadia, Firdaus; Cho, Hancheol ULg

in Journal of Applied Mechanics (2013), 80(4), 041023-1041023-10

This paper deals with finding Lagrangians for damped, linear multi-degree-of-freedom systems. New results for such systems are obtained using extensions of the results for single and two degree-of-freedom ... [more ▼]

This paper deals with finding Lagrangians for damped, linear multi-degree-of-freedom systems. New results for such systems are obtained using extensions of the results for single and two degree-of-freedom systems. The solution to the inverse problem for an n-degree-of-freedom linear gyroscopic system is obtained as a special case. Multi-degree-of-freedom systems that commonly arise in linear vibration theory with symmetric mass, damping, and stiffness matrices are similarly handled in a simple manner. Conservation laws for these damped multi-degree-of-freedom systems are found using the Lagrangians obtained and several examples are provided. [less ▲]

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