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See detailMates but not sexes differ in migratory niche in a monogamous penguin species
Thiebot, Jean-Baptiste; Bost, Charles-André; Dehnhard, Nina et al

in Biology Letters (2015), 11

Strong pair bonds generally increase fitness in monogamous organisms, but may also underlie the risk of hampering it when re-pairing fails after the winter season. We investigated whether partners would ... [more ▼]

Strong pair bonds generally increase fitness in monogamous organisms, but may also underlie the risk of hampering it when re-pairing fails after the winter season. We investigated whether partners would either maintain contact or offset this risk by exploiting sex-specific favourable niches during winter in a migratory monogamous seabird, the southern rockhopper penguin Eudyptes chrysocome. Using light-based geolocation,we showthat although the spatial distribution of both sexes largely overlapped, pair-wise mates were located on average 595+260 km (and up to 2500 km) apart during winter. Stable isotope data also indicated a marked overlap between sex-specific isotopic niches (d13C and d15N values) but a segregation of the feeding habitats (d13C values) within pairs. Importantly, the tracked females remained longer (12 days) at sea than males, but all re-mated with their previous partners after winter. Our study provides multiple evidence that migratory species maywell demonstrate pair-wise segregation even in the absence of sex-specific winter niches (spatial and isotopic).We suggest that dispersive migration patterns with sex-biased timings may be a sufficient proximal cause for generating such a situation in migratory animals [less ▲]

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See detailMath & Manips à l'école primaire : construction de la notion de volume
Guissard, Marie-France; Henry, Valérie ULg; Lambrecht, Pauline et al

in Losanges (2013), 23

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See detailMath & Manips pour construire la notion de volume
Guissard, Marie-France; Henry, Valérie ULg; Lambrecht, Pauline et al

in Grand N (2015), 96

Nous proposons ici une séquence d'apprentissage qui vise à poser des bases solides pour la compréhension du concept de volume chez les enfants de 10 à 12 ans, en intégrant des manipulations. L’étude du ... [more ▼]

Nous proposons ici une séquence d'apprentissage qui vise à poser des bases solides pour la compréhension du concept de volume chez les enfants de 10 à 12 ans, en intégrant des manipulations. L’étude du volume en amont des formules est en effet un parent pauvre de l’enseignement, sans doute parce qu’il passe par la réalisation et l’analyse d’expériences physiques. Pourtant c’est un enjeu fondamental de concevoir le volume comme une grandeur et non seulement comme un nombre. Dans la séquence proposée, de nombreuses expériences, comme le remplissage de boîtes de formes variées et l’immersion de solides de masses et formes diverses, visent l'appropriation de la notion de volume, tant pour les objets creux que pour les pleins. Ces manipulations conduisent à la création de diverses images mentales dont la cohérence est progressivement installée. [less ▲]

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See detailMath & Manips pour le secondaire supérieur : problèmes d'optimisation
Henry, Valérie ULg; Guissard, Marie-France; Lambrecht, Pauline et al

in Losanges (2014), 24

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See detailMath et Manips à l'école primaire. Favoriser l'apprentissage des grandeurs par des manipulations
Guissard, Marie-France; Henry, Valérie ULg

in Losanges (2011), 15

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See detailMathémagie - L'art de la divination
Vandomme, Elise ULg

Speech/Talk (2016)

Cet exposé est basé sur la suite des exposés Mathémagie (I, II, III) de Michel Rigo. Nous présentons ici 10 tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien ... [more ▼]

Cet exposé est basé sur la suite des exposés Mathémagie (I, II, III) de Michel Rigo. Nous présentons ici 10 tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination et le célèbre tour du ``barman aveugle avec des gants de boxe''. Contrairement au magicien qui ne dévoile jamais ses secrets, ici, nous expliquons que ces tours reposent sur diverses propriétés et constructions mathématiques, comme la théorie des graphes ou la combinatoire des mots. [less ▲]

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See detailMathémagie 2
Rigo, Michel ULg

Speech/Talk (2012)

Nous présentons ici des tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination etc. Contrairement au magicien qui ne ... [more ▼]

Nous présentons ici des tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination etc. Contrairement au magicien qui ne dévoile jamais ses secrets, ici, nous expliquons que ces tours reposent sur diverses propriétés et constructions mathématiques (décomposition d'une permutation en produit de cycle, suites linéaires récurrentes, ...). Il y en aura donc pour tous les goûts... et tous les niveaux. Dans la mesure du possible, nous présenterons de "nouveaux" tours qui n'auraient pas déjà été dévoilés dans un exposé précédent. [less ▲]

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See detailMathémagie et au-delà
Rigo, Michel ULg

Learning material (2010)

Nous présentons ici 5 tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination et le célèbre tour du ``barman aveugle ... [more ▼]

Nous présentons ici 5 tours de magie ne nécessitant aucune habileté particulière de la part de l'apprenti magicien : des tours de cartes, des tours de divination et le célèbre tour du ``barman aveugle avec des gants de boxe''. Contrairement au magicien qui ne dévoile jamais ses secrets, ici, nous expliquons que ces tours reposent sur diverses propriétés et constructions mathématiques. Ces dernières débouchent sur de véritables questions de recherche actuelle en théorie des graphes ou en combinatoire des mots et même sur de possibles applications en robotique et automatisation ! Il y en aura donc pour tous les goûts... et tous les niveaux (suivant l'auditoire, l'exposé sera adapté au niveau des élèves de la 4ième à la 6ième secondaire, voire même aux étudiants universitaires). Ce texte présente donc un matériel qui dépassera souvent (et de loin) le ``spectacle''. [less ▲]

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See detailMathémagie III
Rigo, Michel ULg

Speech/Talk (2013)

Cet exposé est dans la continuité de mes précédentes prestations comme apprenti-magicien. Il s'adresse au plus grand nombre et ne nécessite pas de prérequis particulier. Je réaliserai 6 ou 7 tours de ... [more ▼]

Cet exposé est dans la continuité de mes précédentes prestations comme apprenti-magicien. Il s'adresse au plus grand nombre et ne nécessite pas de prérequis particulier. Je réaliserai 6 ou 7 tours de "mathémagie" (tours de cartes, divination, mentalisme,...). Pour chaque tour, le scénario sera identique : réalisation du tour, explication, mise en évidence des structures et résultats mathématiques sous-jacents et enfin, illustration de ces concepts mathématiques mis en oeuvre dans d'autres contextes (informatique, théorie de l'information, ...) [less ▲]

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See detailMathematical and numerical geohydrodynamic models
Beckers, Jean-Marie ULg

in Nihoul, Jacques; Chen, Chen-Tung Arthur (Eds.) Encyclopedia of life support systems (EOLSS) (2008)

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See detailA mathematical comment on the formulae for the aggregation index and the shape index.
Bogaert, Jan ULg; Myneni, R B; Knyazikhin, Y

in Landscape Ecology (2002), 17(1), 87-90

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See detailMathematical description of heat and mass transfer during deep-bed drying: effect of product shrinkage on bed porosity
Bennamoun, Lyes ULg; belhamri, Azeddine

in Applied Thermal Engineering (2008), 18(17-18), 2236-2244

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See detailMathematical formulation and exact solution for landing location problem in tropical forest selective logging, a case study in Southeast Cameroon
Philippart, Julien ULg; Minghe, Sun; Doucet, Jean-Louis ULg et al

in Journal of Forest Economics (2012), 18

In Central Africa, creating forest roads and skid trails is one of the most costly and environmentally damaging operations for the forest's ecosystem. An optimized road network is essential for reducing ... [more ▼]

In Central Africa, creating forest roads and skid trails is one of the most costly and environmentally damaging operations for the forest's ecosystem. An optimized road network is essential for reducing construction costs and improving the sustainable management of timber resources. The location of landings is vital in the development of a future forest road network. In this study, a binary integer programming model similar to the uncapacitated facility location problem is formulated to optimize the locations of the landings. The model is applied to selective logging in Central Africa and tested on an annual logging zone in Southeast Cameroon. The results are compared to that of manual road planning, the currently used method. [less ▲]

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See detailMathematical formulations of shallow water models with porosity for urban flood modeling
Bruwier, Martin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in ICHE 2014 : 11th International Conference on Hydroscience & Engineering (2014)

Due to climate change and other environmental changes such as growing urbanization, floods are expected to become more frequent and severe in the future. However, the magnitude of these changes remains ... [more ▼]

Due to climate change and other environmental changes such as growing urbanization, floods are expected to become more frequent and severe in the future. However, the magnitude of these changes remains highly uncertain. This calls generally for the analysis of a high number of scenarios and, therefore, many runs of the numerical models are necessary. Simultaneously, high-resolution topographic data have become widely available. Consequently, the present need is mainly for high performance computational models which take full benefit of the available detailed data, combining thus accuracy and high efficiency. One way to meet this challenge is the development of subgrid models. Within each computational cell of a subgrid model, the topography is represented by porosity parameters. The existing approaches for the derivation of the shallow water equations (SWE) with porosity differ in the mathematical formulations obtained, in the assumptions, in the applicability range of the models as well as in the definitions of the porosities (depthdependent/depth-independent, isotropic/anisotropic). In this paper, we review and compare the different formulations, highlight their respective limitations and criticaly analyse the major assumptions. [less ▲]

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See detailMathematical Level-Set Modelling of Cell Growth on 3D Surfaces
Guyot, Yann ULg; Papatoniou, Ioannis; Chai, Yoke Chin et al

Poster (2012, September)

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See detailA mathematical model describing the biology of orthodontic tooth movement
Van Schepdael, A.; Vander Sloten, Jos; Geris, Liesbet ULg

in Goh Cho Hong, James; Teck Lim, Chwee (Eds.) proceedings of the 6th world congress on biomechanics (2010)

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See detailMathematical model for a micromachined accelerometer
Lewis, Christopher P.; Kraft, Michaël ULg; Hesketh, Thomas G.

in Transactions of the Institute of Measurement and Control (1996), 18(2), 92--98

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See detailA MATHEMATICAL MODEL FOR CELL/MATRIX GROWTH ON 3D SURFACES USING THE LEVEL SET METHOD.
Guyot, Yann ULg; Papantoniou, Ioannis; Chai, Yoke Chin et al

Conference (2013, April 03)

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See detailA mathematical model of adult subventricular neurogenesis.
Ashbourn, JM; Miller, JJ; Reumers, V et al

in Journal of the Royal Society, Interface (2012)

Neurogenesis has been the subject of active research in recent years and many authors have explored the phenomenology of the process, its regulation and its purported purpose. Recent developments in ... [more ▼]

Neurogenesis has been the subject of active research in recent years and many authors have explored the phenomenology of the process, its regulation and its purported purpose. Recent developments in bioluminescent imaging (BLI) allow direct in vivo imaging of neurogenesis, and in order to interpret the experimental results, mathematical models are necessary. This study proposes such a mathematical model that describes adult mammalian neurogenesis occurring in the subventricular zone and the subsequent migration of cells through the rostral migratory stream to the olfactory bulb (OB). This model assumes that a single chemoattractant is responsible for cell migration, secreted both by the OB and in an endocrine fashion by the cells involved in neurogenesis. The solutions to the system of partial differential equations are compared with the physiological rodent process, as previously documented in the literature and quantified through the use of BLI, and a parameter space is described, the corresponding solution to which matches that of the rodent model. A sensitivity analysis shows that this parameter space is stable to perturbation and furthermore that the system as a whole is sloppy. A large number of parameter sets are stochastically generated, and it is found that parameter spaces corresponding to physiologically plausible solutions generally obey constraints similar to the conditions reported in vivo. This further corroborates the model and its underlying assumptions based on the current understanding of the investigated phenomenon. Concomitantly, this leaves room for further quantitative predictions pertinent to the design of future proposed experiments. [less ▲]

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