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See detailLa cartographie des risques et les risques de la cartographie
Cornélis, Bernard; Billen, Roland ULg

in Hupet, P. (Ed.) Risque et systèmes complexes : les enjeux de la communication (2001)

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See detailLes rudistes de la Mésogée. Anatomie et biotope.
Pierard, Sébastien ULg; Franchimont, Claudine ULg; Pierard, Gérald ULg

in Revue Verviétoise d'Histoire Naturelle (2001), 58

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See detailSize-related predation reduces intramorph competition in paedomorphic Alpine newts
Denoël, Mathieu ULg; Joly, Pierre

in Canadian Journal of Zoology (2001), 79(6), 943-948

Evolutionary theory assumes that facultative paedomorphosis in newts and salamanders is adaptive in allowing either a younger age at maturity or resource partitioning between the heterochronic morphs. In ... [more ▼]

Evolutionary theory assumes that facultative paedomorphosis in newts and salamanders is adaptive in allowing either a younger age at maturity or resource partitioning between the heterochronic morphs. In newt populations that only take the metamorphic ontogenetic pathway, juveniles are terrestrial and avoid food competition with larvae and breeding adults. In contrast, in populations where paedomorphosis occurs, branchiate newts of all sizes coexist in the aquatic habitats, posing the question of whether intramorph competition exists and its relationship with the evolution of paedomorphosis. We studied size-related predation in such a size-structured community of branchiate Alpine newts (Triturus alpestris) inhabiting a deep alpine lake. Although gape limitation may explain such size-related predation, individuals also exhibited selectivity according to prey size. Amongst small prey that were within the capture range of all newt size classes, smaller newts preyed on smaller items than did larger ones. We assume that such decisions favour the coexistence of different-sized individuals. It is suspected that such size-selective predation on items which are avoided by water-living metamorphs allows the maintenance of facultative paedomorphosis, in favouring resource partitioning between morphs. [less ▲]

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See detailBreeding Phaseolus for intercrop combinations in Andean highlands.
Baudoin, Jean-Pierre ULg; Camarena, F.; Lobo, M. et al

in Broadening the genetic base of crop production (2001)

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See detailCaractérisation et valorisation du savoir paysan sur les insectes nuisibles du pois cajan (Cajanus cajan (L.) Millsp.) dans le Nord de l'Ouganda
Velay, F.; Baudoin, Jean-Pierre ULg; Mergeai, Guy ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2001), 5(2), 105-114

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See detailSélection de cotonniers présentant une très faible teneur en gossypol dans ses organes - Approche interspécifique
Mergeai, Guy ULg; Maquet, A.; Benbouza, H. et al

in Des modèles biologiques à l'amélioration des plantes (2001)

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See detailConstruire des indicateurs internationaux d'équité des systèmes éducatifs
Demeuse, Marc; Baye, Ariane ULg; Straeten, Marie-Hélène

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2001), 7-8

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See detailProgramme international pour le suivi des acquis des élèves (PISA) de l'OCDE
Lafontaine, Dominique ULg; Baye, Ariane ULg; Matoul, Anne ULg

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2001), 7-8(7-8), 53-57

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See detailApproche spatiale de l’exclusion
Teller, Jacques ULg; Vauchel, Bernadette ULg

in Bawin-legros, B.; Stassen, J.-F. (Eds.) L’exclusion et l’insécurité d’existence en milieu urbain (2001)

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See detailShelf-slope exchanges associated with a steep submarine canyon off Calvi (Corsica, NW Mediterranean Sea): A modelling approach
Skliris, Nikos; Goffart, Anne ULg; Hecq, Jean-Henri ULg et al

in Journal of Geophysical Research (2001), 106(C9), 19883-19901

A three-dimensional, unsteady, nonlinear, high-resolution model is used to investigate the impact of the Calvi Canyon (NW Corsica) steep topography on the shelf-slope exchanges as well as on the ... [more ▼]

A three-dimensional, unsteady, nonlinear, high-resolution model is used to investigate the impact of the Calvi Canyon (NW Corsica) steep topography on the shelf-slope exchanges as well as on the circulation in the Calvi Bay in homogeneous winter and early spring conditions. A double σ coordinate system is considered in order to represent adequately the high depth gradients within the canyon. The studied region is under the influence of the West Corsica Current flowing northeastward along the NW Corsican coast (right-bounded flow). Model results show that the circulation in the Calvi Bay is determined by flow modifications in the canyon area. The mean horizontal flow is deviated southwestward upstream of the canyon to form an anticyclonic gyre in the western part of the Calvi Bay. Within the canyon the circulation is cyclonic leading to an offshore flow downstream of the canyon. Around the canyon rim, the cross-shelf currents become important, indicating that this region acts as a transition zone of high exchange between nearshore and offshore areas. Furthermore, the canyon topography generates high downwelling (upwelling) and downsloping (upsloping) velocities responsible for an intense vertical transport of material in the area. Numerical runs are performed for typical prevailing wind conditions. The wind is responsible for a drastic increase of cross-shore transports between the bay and the canyon area (3–4 times larger than in the no-wind case). SW winds induce a further enhancement of cross-shelf exchanges, whereas the effect of N-NE winds is to reduce exchange at the shelf break apart from the canyon head where an intense offshore flow occurs. Within the canyon, high vertical velocities are shown to be associated with high cyclonic vorticity which is enhanced (reduced) by the N-NE (SW) wind event. A comparison between model results and measured distributions of nitrate and chlorophyll a concentrations in the area shows the role played by this specific hydrodynamics as a strong constraint on the coastal pelagic ecosystem. [less ▲]

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See detailMons/Maisières : le site de plein air de Maisières-Canal
Miller, Rebecca ULg; Otte, Marcel ULg; Haesaerts, Paul

in Chronique de l'Archéologie Wallonne (2001), 9

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See detailTHE ESTIMATION OF THE HERBACEOUS BIOMASS IN THE SAHELIANS PASTORAL ZONES USING A GIS
TIZIANA, DE FILIPPIS; Djaby, Bakary ULg; BRAHIMA, KONE et al

in Gérard, Bégni (Ed.) Observing our environment from space: new solutions for a new millennium (2001)

In the Sahel region the pastorals resources are strongly linked to the fluctuation of the biomass production and as well as the breeding systems, which are based on the transhumance and the nomadism as ... [more ▼]

In the Sahel region the pastorals resources are strongly linked to the fluctuation of the biomass production and as well as the breeding systems, which are based on the transhumance and the nomadism as well. In the present study, an integrated approach of multi-source, multi-type and multi-scales data analysis in the pastoral zone in Senegal, Mali, Burkina Faso, Mauritania, Niger and Chad has been developed using PC-Arc/Info and Arc/View potentialities for the purpose of Sahelian rangeland production estimation. [less ▲]

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See detailCounting the Solutions of Presburger Equations without Enumerating Them
Boigelot, Bernard ULg; Latour, Louis

in Lecture Notes in Computer Science (2001), 2494

The Number Decision Diagram (NDD) has recently been proposed as a powerful representation system for sets of integer vectors. In particular, NDDs can be used for representing the sets of solutions of ... [more ▼]

The Number Decision Diagram (NDD) has recently been proposed as a powerful representation system for sets of integer vectors. In particular, NDDs can be used for representing the sets of solutions of arbitrary Presburger formulas, or the set of reachable states of some systems using unbounded integer variables. In this paper, we address the problem of counting the number of distinct elements in a set of vectors represented as an NDD. We give an algorithm that is able to perform an exact count without enumerating explicitly the vectors, which makes it capable of handling very large sets. As an auxiliary result, we also develop an efficient projection method that allows to construct efficiently NDDs from quantified formulas, and thus makes it possible to apply our counting technique to sets specified by formulas. Our algorithms have been implemented in the verification tool LASH, and applied successfully to various counting problems. [less ▲]

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