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See detailPropositions pour une politique de soutien des indépendants en difficulté
Van Caillie, Didier ULg; Lambrecht, Johan

Book published by Fondation Roi Baudouin - 1ère édition (2012)

This study discusses seven proposals allowing to increase the efficiency of administrative and legal measures taken by Belgian Public Authorities to prevent and to tackle with the difficulties encountered ... [more ▼]

This study discusses seven proposals allowing to increase the efficiency of administrative and legal measures taken by Belgian Public Authorities to prevent and to tackle with the difficulties encountered by entrepreneurs confrontated to the first steps of a business decline. [less ▲]

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See detailA non-linear homogeneous model for bone-like materials under compressive load.
Mengoni, Marlène ULg; Voide, Romain; de Bien, Charlotte ULg et al

in International Journal for Numerical Methods in Biomedical Engineering (2012), 28(2), 334-348

Finite element (FE) models accurately compute the mechanical response of bone and bone-like materials when the models include their detailed microstructure. In order to simulate non-linear behavior, which ... [more ▼]

Finite element (FE) models accurately compute the mechanical response of bone and bone-like materials when the models include their detailed microstructure. In order to simulate non-linear behavior, which currently is only feasible at the expense of extremely high computational costs, coarser models can be used if the local morphology has been linked to the apparent mechanical behavior. The aim of this paper is to implement and validate such a constitutive law. This law is able to capture the non-linear structural behavior of bone-like materials through the use of fabric tensors. It also allows for irreversible strains using an elastoplastic material model incorporating hardening. These features are expressed in a constitutive law based on the anisotropic continuum damage theory coupled with isotropic elastoplasticity in a finite strains framework. This material model was implemented into Metafor, a non-linear FE software. The implementation was validated against experimental data of cylindrical samples subjected to compression. Three materials with bone-like microstructure were tested : aluminum foams of variable density (ERG, Oakland, CA), PLA (polylactic acid) foam (CERM, University of Liège) and cancellous bone tissue of a deer antler (Faculty of Veterinary Medicine, University of Liège). [less ▲]

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See detailLivre Blanc Céréales - Gembloux
Destain, Jean-Pierre ULg; Bodson, Bernard ULg

Book published by Gembloux Agro-Bio Tech - Edition février 2012 (2012)

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See detailA Single Ancient Origin for Prototypical Serine/Arginine-Rich Splicing Factors1[W][OA]
Califice, Sophie; Baurain, Denis ULg; Hanikenne, Marc ULg et al

in Plant Physiology (2012), 158(2), 546-560

Eukaryotic pre-mRNA splicing is a process involving a very complex RNA-protein edifice. Serine/arginine-rich (SR) proteins play essential roles in pre-mRNA constitutive and alternative splicing, and have ... [more ▼]

Eukaryotic pre-mRNA splicing is a process involving a very complex RNA-protein edifice. Serine/arginine-rich (SR) proteins play essential roles in pre-mRNA constitutive and alternative splicing, and have been suggested to be crucial in plant-specific forms of developmental regulation and environmental adaptation. Despite their functional importance, little is known about their origin and evolutionary history. SR splicing factors have a modular organization featuring at least one RRM domain and a C-terminal region enriched in Ser/Arg dipeptides. To investigate the evolution of SR proteins, we infer phylogenies for >12,000 RRM domains representing >200 broadly sampled organisms. Our analyses reveal that the RRM domain is not restricted to eukaryotes and that all prototypical SR proteins share a single ancient origin, including the plant-specific SR45 protein. Based on these findings, we propose a scenario for their diversification into four natural families, each corresponding to a main SR architecture, and a dozen subfamilies, of which we profile both sequence conservation and composition. Finally, using operational criteria for computational discovery and classification, we catalogue SR proteins in 20 model organisms, with a focus on green algae and land plants. Altogether, our study confirms the homogeneity and antiquity of SR splicing factors, while establishing robust phylogenetic relationships between animal and plant proteins, which should enable functional analyses of lesser characterized SR family members, especially in green plants. [less ▲]

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See detailWhat have the last outbreaks of atypical myopathy in Europe told us: new treatment plans
Van Galen, Gaby ULg; Votion, Dominique ULg

in Verwilghen, Denis; Van Galen, Gaby; Busoni, Valeria (Eds.) Belgian International Congress: Hippos 2012 (2012, February)

Management and treatment of atypical myopathy cases

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See detailRhino vs paquebot: 1-0
Hamers, Jérémy ULg

Article for general public (2012)

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See detailLe Parlement Jeunesse de la Communauté française, une initiative citoyenne ?
Wintgens, Sophie ULg; Dabée, Maëlle

in Fournier, Bernard; Hudon, Raymond (Eds.) Engagements politiques et citoyens de jeunes. Bilans et expériences au Canada et en Europe (2012, February)

Créée en 1997 dans l'esprit du modèle québécois, l'ASBL Parlement Jeunesse de la Communauté française organise annuellement une simulation parlementaire à destination de jeunes francophones résidants en ... [more ▼]

Créée en 1997 dans l'esprit du modèle québécois, l'ASBL Parlement Jeunesse de la Communauté française organise annuellement une simulation parlementaire à destination de jeunes francophones résidants en Belgique, âgés de 17 à 26 ans. Cette initiative citoyenne permet ainsi à une centaine de jeunes, idéalement issus de tous milieux et de tous horizons, de découvrir les rouages internes de la démocratie, conformément aux mécanismes et procédures propres au système parlementaire belge. Là où nombre d'études scientifiques sur l'engagement politique des jeunes s'accordent sur la prévalence d'un désintérêt manifeste et – plus largement – sur une tendance générale au déclin de l'engagement politique chez les jeunes, l'action citoyenne mise en œuvre par le Parlement Jeunesse témoigne en réalité de l'existence de formes moins classiques – dans le cas présent, associative – de socialisation des jeunes à la « chose politique ». L’objectif général poursuivi dans cette contribution est d'identifier la nature et les fondements de l'engagement politique déployé à travers cette jeune initiative, ainsi que d’en mesurer la portée et les limites. Dès lors, en quoi le Parlement Jeunesse participe-t-il de l’engagement politique des jeunes ? Ne contribue-t-il qu’au renforcement d’un intérêt politique latent et préexistant ? A contrario, participe-t-il de la construction d’un engagement politique au départ d’un processus d’apprentissage pratique des rouages de la démocratie parlementaire ? En d’autres termes, quelles sont les forces et les faiblesses de cette initiative citoyenne en terme de socialisation politique de la jeunesse ? [less ▲]

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See detailHet janushoofd van Julia (1885)
Steyaert, Kris ULg

in Nederlandse Letterkunde (2012), 17(1), 10-31

In 1884 Willem Kloos and Albert Verwey started work on Julia, a collection of forty poems written in the manner of the successful author Fiore della Neve (M.G.L. van Loghem). In their pamphlet The ... [more ▼]

In 1884 Willem Kloos and Albert Verwey started work on Julia, a collection of forty poems written in the manner of the successful author Fiore della Neve (M.G.L. van Loghem). In their pamphlet The Incompetence of the Dutch Literary Critics (1886), in which Julia’s true authorship was revealed, Kloos and Verwey made plain that the poems had been conceived as deliberate nonsense, something the Dutch literary establishment had failed to recognize. Nevertheless, a close reading of the collection brings to light a number of textual similarities with Kloos’s and Verwey’s serious poetry written in the period 1883-1885. This article reveals Julia as a fascinating hybrid in which an older aesthetic coexists with a new poetical language associated with the Eighties Movement. [less ▲]

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See detailInvestigations sur les protéines placentaires extraites des cotylédons fœtaux du Cervus elaphus
Fondja, E.; Okuyama, M.; Petrova, A. et al

Poster (2012, February)

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See detailEvaluation of the Enhanced Assumed Strain and Assumed Natural Strain in the SSH3D and RESS3 Solid Shell Elements for Single Point Incremental Forming Simulation
Guzmán Inostroza, Carlos Felipe ULg; Ben Bettaieb, Amine ULg; Velosa de Sena, José Ilidio et al

in Key Engineering Materials [=KEM] (2012), 504-506

Single Point Incremental Forming (SPIF) is a recent sheet forming process which can give a symmetrical or asymmetrical shape by using a small tool. Without the need of dies, the SPIF is capable to deal ... [more ▼]

Single Point Incremental Forming (SPIF) is a recent sheet forming process which can give a symmetrical or asymmetrical shape by using a small tool. Without the need of dies, the SPIF is capable to deal with rapid prototyping and small batch productions at low cost. Extensive research from both experimental and numerical sides has been carried out in the last years. Recent developments in the finite element simulations for sheet metal forming have allowed new modeling techniques, such as the Solid Shell elements, which combine the main features of shell hypothesis with a solid-brick element. In this article, two recently developed elements -SSH3D element [1, 2] and RESS3 element [3]- implemented in Lagamine (finite element code developed by the ArGEnCo department of the University of Liège) are explained and evaluated using the SPIF line test. To avoid locking problems, the well-known Enhanced Assumed Strain (EAS) and Assumed Natural Strain (ANS) techniques are used. The influence of the different EAS and ANS parameters are analysed comparing the predicted tool forces and the shape of a transversal cut, at the end of the process. The results show a strong influence of the EAS in the forces prediction, proving that a correct choice is fundamental for an accurate simulation of the SPIF using Solid Shell elements. [less ▲]

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See detailStructuration de la diversité génétique du genre Milicia: taxonomie, phylogéographie, dynamique des populations
Daïnou, Kasso ULg

Doctoral thesis (2012)

Characterizing population genetic structure using phylogeographic approach contributes to understanding of evolutionary processes that affect plant populations. The present study investigated how past ... [more ▼]

Characterizing population genetic structure using phylogeographic approach contributes to understanding of evolutionary processes that affect plant populations. The present study investigated how past environmental variations can shape the spatial genetic diversity of an African timber tree species, Milicia excelsa (Welw) C.C. Berg. Given that plant responses to disturbances are closely linked to life history traits, this research also aimed to describe relationships between the reproductive traits of M. excelsa and its population genetic structure. Phylogeographic analyses were performed throughout the range of M. excelsa using nuclear and chloroplastic markers. Ecological characterization was conducted for a single population located in south-East Cameroon. Since M. excelsa is similar to the other species of its genus, M. regia (A. Chev) C.C. Berg, we first performed a morphogenetic comparison of these two taxa. The results confirmed an important morphological similarity between the two species with very rare discriminating criteria. In fact Bayesian assignment methods and reproductive isolation patterns suggest the occurrence of interspecific hybridization, which appeared to be unidirectional: hybrids displayed the M. regia morphotype. Because M. regia is known to be more adapted to humid tropical forests, one may expect it to occur in the Congo basin zone. However, its range is restricted to the western part of West Africa while M. excelsa occurs from Guinea-Conakry to Zimbabwe. Interestingly, in the case of M. excelsa, Central and West African specimens had no shared haplotype. This result was unexpected because long gene dispersal distances were found in Cameroonian populations, as expected from the behaviours of the main dispersal animals we identified, the bat Eidolon helvum and the parrots Psittacus erithacus and Agapornis swindernianus. In general, despite the likelihood for long distance seed dispersal, distinct genetic clusters were identified over West and Central Africa and their location may support the forest refugia hypothesis. In addition a phylogeographical signal was detected in chloroplast DNA indicating a prolonged separation between West and Central Africa populations with an accumulation of new mutations. At a smaller spatial scale, patterns of genetic structure also seemed to be weakly influenced by divergent reproduction times among sympatric individuals. The level of genetic diversity in the study populations falls within the range of values calculated for other tropical tree species. If phylogeography helps to infer population history, it also requires ecological or biological information to confirm some uncertainties. Such detailed data were often lacking to completely interpret numerous of our results. The present study raised new questions and led to new perspectives for further investigation both in phylogeography and botany. [less ▲]

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See detailLower impact of blue light on non-visual brain functions in older subjects
Daneault, V; Vandewalle, Gilles ULg; Hébert, M et al

Poster (2012, February)

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See detailQuel traitement pour les patients souffrant de lombalgie ?
Demoulin, Christophe ULg; Bruyère, Olivier ULg; Hill, J. C.

in Axxon Journal (2012)

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See detailLa Foire du livre, terrain d'enquête
Barnabé, Fanny ULg; Bertrand, Charlotte ULg; Duchesne, Laurence

Article for general public (2012)

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See detailAmérique latine: progrès et défis d'une région en plein essor
Santander, Sébastian ULg

in Spirit of Management (2012), 14

Depuis 2003, l'Amérique latine connaît une période économique de croissance importante. Elle parvient à traverser la crise mondiale sans trop de difficultés. La demande chinoise des matières premières ... [more ▼]

Depuis 2003, l'Amérique latine connaît une période économique de croissance importante. Elle parvient à traverser la crise mondiale sans trop de difficultés. La demande chinoise des matières premières latino-américaines combinée à une augmentation de la consommation interne et de l'investissement expliquent ces performances. Par ailleurs, des progrès ont été accompli en matière sociale. En outre, la région connaît une stabilité politique grâce à l'enracinement de la démocratie depuis plus de 20 ans. Toutefois, l'Amérique latine a encore pas mal de défis à relever: diversification économique et des débouchés; réduction des inégalités; lutte contre la criminalité organisée, la violence et la corruption. [less ▲]

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See detailCours de géologie
Poty, Edouard ULg

Learning material (2012)

Notes du cours de géologie de 1 bac en géologie et de 2 bac en géographie

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See detailLearning to play K-armed bandit problems
Maes, Francis ULg; Wehenkel, Louis ULg; Ernst, Damien ULg

in Proceedings of the 4th International Conference on Agents and Artificial Intelligence (ICAART 2012) (2012, February)

We propose a learning approach to pre-compute K-armed bandit playing policies by exploiting prior information describing the class of problems targeted by the player. Our algorithm first samples a set of K ... [more ▼]

We propose a learning approach to pre-compute K-armed bandit playing policies by exploiting prior information describing the class of problems targeted by the player. Our algorithm first samples a set of K-armed bandit problems from the given prior, and then chooses in a space of candidate policies one that gives the best average performances over these problems. The candidate policies use an index for ranking the arms and pick at each play the arm with the highest index; the index for each arm is computed in the form of a linear combination of features describing the history of plays (e.g., number of draws, average reward, variance of rewards and higher order moments), and an estimation of distribution algorithm is used to determine its optimal parameters in the form of feature weights. We carry out simulations in the case where the prior assumes a fixed number of Bernoulli arms, a fixed horizon, and uniformly distributed parameters of the Bernoulli arms. These simulations show that learned strategies perform very well with respect to several other strategies previously proposed in the literature (UCB1, UCB2, UCB-V, KL-UCB and $\epsilon_n$-GREEDY); they also highlight the robustness of these strategies with respect to wrong prior information. [less ▲]

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See detail« Spaßmacher » et « Ernstmacher » en poésie allemande. Les poèmes profanes de Robert Gernhardt.
Viehöver, Vera ULg

in Culture, le Magazine Culturel de l'Université de Liège (2012)

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