Last 7 days
Bookmark and Share    
Peer Reviewed
See detailVariation des traits fonctionnels le long d’un gradient de cuivre et cobalt : contribution du remplacement d’espèces et de la variabilité intraspécifique
Delhaye, Guillaume; Violle, Cyril; Seleck, Maxime ULg et al

Conference (2014, April)

Les collines cuprocobaltifères du Katanga sont des lieux privilégiés pour étudier la variation des traits fonctionnels le long de gradients de stress métallique. Nous avons étudié la variation de six ... [more ▼]

Les collines cuprocobaltifères du Katanga sont des lieux privilégiés pour étudier la variation des traits fonctionnels le long de gradients de stress métallique. Nous avons étudié la variation de six traits à l’échelle des espèces et de la communauté le long d’un gradient de cuivre et cobalt. D’autres paramètres tels que la concentration en phosphore et l’humidité du sol covarient positivement avec la teneur en métal du sol. Les contributions relatives du remplacement d’espèces et de la variabilité intraspécifique à la variabilité totale des traits dans les communautés ont été déterminées. A l’échelle de la communauté, la hauteur et la surface foliaire diminuent alors que les valeurs des quatre autres traits augmentent le long du gradient. Les espèces montrent des réponses variées, généralement non significatives. Pour tous les traits, le remplacement d’espèce est le moteur principal de la variation au sein des communautés. La concentration en métal du sol implique des réponses variées sur les différents traits et les différentes espèces. Nous montrons que la concentration croissante en métal privilégie le remplacement d’espèce par rapport à la variation intraspécifique et que les espèces répondent par différentes stratégies de tolérance à la concentration en métal du le sol. La variation des traits à l’échelle des communautés est essentiellement le reflet d’un changement dans les abondances des différentes formes de vie. Les espèces à xylopodes sont dominantes sur sol pauvre en métal alors que les annuelles sont dominantes sur sol très enrichi. [less ▲]

Detailed reference viewed: 11 (1 ULg)
See detailMeta-Cognitive Mystery Tales
Dechêne, Antoine ULg

Conference (2014, April)

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailEvaluation of the relationships between characteristics of the vertebral column of different cetaceans and their ecology: A preliminary study.
Gillet, Amandine ULg; Ninane, Catherine ULg; Remy, François ULg et al

Poster (2014, April)

Ecomorphology is the study of the relationships between functional design and the environment. One of its aims is to understand how the environmental factors can constraint the performance of an organism ... [more ▼]

Ecomorphology is the study of the relationships between functional design and the environment. One of its aims is to understand how the environmental factors can constraint the performance of an organism or act on its phenotype. Different studies have already showed in different cetaceans that the number and shape of vertebrae can reflect the stiffness of the body and consequently can impact their swimming mode. The aim of this preliminary study is to establish relationships between characteristics of the vertebral column of different cetaceans and their ecology. To this purpose, we have studied meristic and morphometric data on the vertebrae (centrum length, height and width, neural and haemal spine height and the transverse process length) of different species of mysticetes and odontocetes coming from the Aquarium-Museum of Liège and Royal Institute of Natural Sciences of Bruxelles. Preliminary results showed the distinction of three morphotypes: firstly, the active, cruising, fast swimmers with rigid body, secondly, the maneuverers, slow swimmers with flexible body and thirdly, the steady swimmers. [less ▲]

Detailed reference viewed: 37 (16 ULg)
Full Text
Peer Reviewed
See detailBone sialoprotein as a potential key factor implicated in the pathophysiology of osteoarthritis
Pesesse, Laurence ULg; Sanchez, Christelle ULg; Walsh, David et al

in Osteoarthritis and Cartilage (2014), 22(4), 547-56

Detailed reference viewed: 7 (3 ULg)
Full Text
Peer Reviewed
See detailAnimal health and welfare: equivalent or complementary?
Nicks, Baudouin ULg; Vandenheede, Marc ULg

in Revue scientifique et technique - Office international des épizooties (2014), 33(1), 91-96

Reflexion about the concepts of "health" and "welfare", applied to domestic animals in comparison with humans.

Detailed reference viewed: 83 (50 ULg)
Peer Reviewed
See detailOptimized Waveform Relaxation Methods for Modeling Electromagnetic Field-Circuit Problems
Nshimiyimana, Jean de Dieu ULg; Plumier, Frédéric ULg; Dular, Patrick ULg et al

in Proceedings of Sixteenth Biennal IEEE Conference on Electromagnetic Field Computation (2014, April)

The convergence of classical and optimized waveform relaxation methods is compared for the simulation of field-circuit problems, where a finite element solver is used for the solution of the field problem ... [more ▼]

The convergence of classical and optimized waveform relaxation methods is compared for the simulation of field-circuit problems, where a finite element solver is used for the solution of the field problem and a circuit simulator is used for the electronic circuit. [less ▲]

Detailed reference viewed: 17 (6 ULg)
Full Text
Peer Reviewed
See detailNeutralizing properties of peptides derived from CXCR4 extracellular loops towards CXCL12 bidnig and HIV-1 infection
Szpakowska, Martyna ULg; Fievez, Virginie; Counson, Manuel et al

Poster (2014, April)

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailvCCL2, the third agonist ligand for the -arrestin-biased chemokine receptor CXCR7
Szpakowska, Martyna ULg; Derj, Anouar ULg; Counson, Manuel et al

Poster (2014, April)

Detailed reference viewed: 16 (5 ULg)
Full Text
See detailProjet TADAM: Conclusions scientifiques et recommandations
Lemaître, André ULg; ANSSEAU, Marc ULg; Demaret, Isabelle ULg

in Lettre du RESPADD (2014), (18), 2-4

Detailed reference viewed: 9 (2 ULg)
Full Text
Peer Reviewed
See detailCrystal Chemistry of Synthetic M(2+)Be2P2O8 (M(2+) = Ca, Sr, Pb, Ba) Beryllophosphates
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg; Baijot, Maxime ULg

in Canadian Mineralogist (2014), 52(2), 337-350

Detailed reference viewed: 9 (2 ULg)
Full Text
See detailWhen Firms Cross-List, do Investors care?
Mouchette, Xavier ULg

Doctoral thesis (2014)

Over the past three decades, financial markets have experienced a tremendous increase in global linkages. Cross-Listing is one prominent example of these trends. By cross-listing firms can proactively ... [more ▼]

Over the past three decades, financial markets have experienced a tremendous increase in global linkages. Cross-Listing is one prominent example of these trends. By cross-listing firms can proactively broaden their shareholder basis, overcome limitations of their domestic markets, and link their securities to multiple capital markets at a time. Its far-reaching financial effects are associated with this internationalization of the firm’s capital structure. This thesis focuses on the valuation implications of cross-listing towards major international exchanges. Early attempts to explain these valuation effects called upon international capital market segmentation. This view has since then been highly challenged. Nevertheless, the magnitude of segmentation and its relationship with cross-listing has received much less attention. Our empirical investigations first establish that firms that are about-to-cross-list are not entirely integrated with global capital markets. Furthermore, previous cross-listings which originate from the same home country and country funds both have significant importance to assess the degree of this integration. We next disentangle between the validity of segmentation and informational improvement arguments in explaining the magnitude of cross-listing price effects. Our results suggest that firms that cross-list towards the US markets obtain benefits through the resolution of informational barriers only, while firms from emerging markets derive benefits as a function of their pre-cross-listing segmentation. Crucially, both channels appear conditional on the preceding cross-listing activity. Finally, reactions to cross-listing prove to be not as immediate as assumed by the classical event study literature. Substantial investors' anticipation of the cross-listing decision is demonstrated, as well as the variation regarding the speed and length of the reactions. Size, destination exchange, and the extent to which the firm is integrated into international capital markets appear to be the most influential factors. [less ▲]

Detailed reference viewed: 26 (7 ULg)
Full Text
Peer Reviewed
See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien ULg; Heuchenne, Cédric ULg

Conference (2014, April)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the ... [more ▼]

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the traditional approach, we don't use any GARCH-type estimation of the conditional variance. Instead, we propose to use a recently developed nonparametric procedure (Mercurio and Spokoiny, 2004): the Local Adaptive Volatility Estimation (LAVE). The motivation for using this method is to avoid a possible model misspecification for the conditional variance. In a second step, we suggest a set of estimation and model selection procedures (Berk-Jones tests, kernel density-based selection, censored likelihood score, coverage probability) based on the so-obtained residuals. These methods enable to assess the global fit of a given distribution as well as to focus on its behavior in the tails. Finally, we illustrate our methodology on three time series (UBS stock returns, BOVESPA returns and EUR/USD exchange rates). [less ▲]

Detailed reference viewed: 46 (19 ULg)