Last 7 days
Bookmark and Share    
Full Text
Peer Reviewed
See detailMéthodologie de lecture de la représentation graphique d’une opération urbaine – Cas d’Europan Détermination des niveaux d’agrégations graphiques « n.a.g. » et des matrices graphiques « m.g. »
Boutemadja, Abdelkader ULg

in Acte du colloque COMMON 14 (2014, September 24)

Dans le cadre de cet article, nous allons expliquer la démarche qui nous a permis d’approcher la question de la représentation graphique du projet d’opération urbaine. Il s’agit pour nous de bien cerner ... [more ▼]

Dans le cadre de cet article, nous allons expliquer la démarche qui nous a permis d’approcher la question de la représentation graphique du projet d’opération urbaine. Il s’agit pour nous de bien cerner la problématique de la représentation graphique et son lien avec la notion de projet en tant qu’outil de communication, de transmission de savoir et d’évolution du projet. C’est au travers d’une lecture du processus évolutif basée sur la systémique que nous allons proposer une démarche originale pour mieux comprendre les productions en termes de représentation graphique du projet. [less ▲]

Detailed reference viewed: 25 (2 ULg)
Full Text
See detailCarbon balance of a grazed pasture and its response to grazing management
Jerome, Elisabeth ULg; Gourlez de la Motte, Louis ULg; Beckers, Yves et al

Poster (2014, September 24)

The C balance of a grazed pasture situated in Condroz (Wallonia) and its dependence on climatic conditions and grazing management were investigated on the basis of eddy covariance measurements and ... [more ▼]

The C balance of a grazed pasture situated in Condroz (Wallonia) and its dependence on climatic conditions and grazing management were investigated on the basis of eddy covariance measurements and horizontal C flow estimates. In average on three years, NEE was +43±24 gCm-2yr-1 and NBP was +7±26 gCm-2yr-1, suggesting that that the site is C neutral. Management by the farmer (organic fertilization), but also climate conditions influencing management (feed supplements), were the main factors impacting the C balance inter-annual variability. At a daily and seasonal scale, grazing impact on CO2 fluxes did not appear explicitly, being blurred by flux response to climate drivers. It was highlighted by specific investigations. The indirect grazing impact (photosynthesizing biomass consumption, excretions, soil compaction) was deduced from an analysis of the flux to PPFD response evolution during grazing period; the direct impact (livestock respiration) was investigated through confinement experiments. Result showed that saturation GPP changes were negatively correlated to grazing intensity (product of the stocking rate and grazing duration). On the contrary, no significant change in TER was observed. The direct impact of grazing due to cattle respiration was estimated to 2.59±0.58 kgCLU-1day-1, i.e. 8% of the TER. [less ▲]

Detailed reference viewed: 27 (0 ULg)
Full Text
See detailTransmettre
Rentier, Bernard ULg

Speech/Talk (2014)

Detailed reference viewed: 22 (2 ULg)
Full Text
See detailAutomutilations à l'adolescence
Malchair, Alain ULg

Scientific conference (2014, September 24)

Detailed reference viewed: 9 (0 ULg)
Full Text
See detailImportance des modèles de distribution de niche potentielle dans la gestion des espèces tropicales exploitées: cas des taxons du genre Guibourtia Benn
Tosso, Dji-ndé Félicien ULg; Daïnou, Kasso ULg; Hambuckers, Alain ULg et al

Poster (2014, September 24)

De la famille des (Fabaceae / Caesalpinioideae) et composé de 13 espèces en Afrique, le genre Guibourtia comporte des taxons à forte valeur culturelle et à forte valeur commerciale. Aujourd'hui, la ... [more ▼]

De la famille des (Fabaceae / Caesalpinioideae) et composé de 13 espèces en Afrique, le genre Guibourtia comporte des taxons à forte valeur culturelle et à forte valeur commerciale. Aujourd'hui, la pression de l'exploitation combinée aux faibles densités de ce genre, fait a priori peser d’importantes menaces sur certaines de ses populations. Un projet de recherche a donc été initié afin de mieux comprendre la structure et la diversité génétique des populations de Guibourtia, en lien avec l'exploitation forestière et les patrons de reproduction spécifiques. Un premier volet de la recherche a consisté à identifier les déterminants climatiques expliquant la distribution des espèces. Nous avons combinée des modèles statiques (Maxent et régression logistique) avec des données du modèle climatique global CNRM CM5, et sur la base de l'occurrence de ces taxons entre 1950 et 2000. Il en ressort que les espèces du genre Guibourtia sont sensibles aux facteurs précipitation (69,2 %) et amplitude thermique (74,3 %). Dans un second temps, il sera utilisé les modèles climatiques des ères géologiques passées afin d'inférer la distribution de l'espèce au cours du Quaternaire, et de faire le lien avec des analyses phylogénétiques et phylogéographiques. Il sera également possible d'évaluer la distribution future de l'espèce tenant compte des modèles d'évolution du climat. Enfin, le projet de recherche s'attèlera particulièrement aux relations phylogénétiques entre espèces morphologiquement similaires en sympatrie ou parapatrie, en caractérisant en détail les flux de gènes entre individus de ces taxons proches, ainsi que leur degré de similarité physiologique. Les résultats de l’étude in fine contribueront à proposer des stratégies de conservation et de gestion durable dans le contexte de l’exploitation forestière d’Afrique centrale et du changement climatique en cours. [less ▲]

Detailed reference viewed: 19 (3 ULg)
See detailBeyond immigrant integration debates and policies. An EU multicultural citizenship?
Martiniello, Marco ULg

Scientific conference (2014, September 24)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailDe l’importance des échelles dyadiques dans les espaces Snu
Kleyntssens, Thomas ULg; Nicolay, Samuel ULg

Conference (2014, September 23)

Le but de l’analyse multifractale est de fournir une méthode permettant d’approximer le spectre de singularités d’une fonction. En 1985, Frisch et Parisi ont proposé un premier formalisme. D'autres ... [more ▼]

Le but de l’analyse multifractale est de fournir une méthode permettant d’approximer le spectre de singularités d’une fonction. En 1985, Frisch et Parisi ont proposé un premier formalisme. D'autres formalismes, basés sur les coefficients d'ondelettes, ont été introduits (ex WLM). Cependant, de part leurs natures, ces méthodes ne peuvent détecter que des spectres concaves. En 2004, Jaffard introduit les espaces Snu pour palier à ce problème. Ces espaces sont inclus dans une intersection d'espaces de Besov. Dans cet exposé, je présente une généralisation des espaces Snu. Ceux-ci sont mis en relation avec les espaces de Besov généralisés et une mise en pratique est présentée. [less ▲]

Detailed reference viewed: 29 (5 ULg)
Full Text
See detailOdour measurement networks: e-noses and emission data
Romain, Anne-Claude ULg

Conference (2014, September 23)

Detailed reference viewed: 18 (4 ULg)
Full Text
See detailSeasonal and inter-annual variability of photosynthetic capacity in a temperate forest
Hurdebise, Quentin ULg; Vincke, Caroline; Soubie, Rémy et al

Poster (2014, September 23)

In temperate forests, the relation between vegetation phenology and carbon sequestration variability remains to be explored. To study phenology impact on CO2 fluxes, two photosynthetic capacity indicators ... [more ▼]

In temperate forests, the relation between vegetation phenology and carbon sequestration variability remains to be explored. To study phenology impact on CO2 fluxes, two photosynthetic capacity indicators were used : NEE at light saturation (NEEsat) and green proportion in canopy pictures (gcc). Correlations between these indicators were investigated at seasonal and inter-annual scale. [less ▲]

Detailed reference viewed: 22 (6 ULg)
Full Text
See detailMulti-period vehicle assignment problem with stochastic load availability
Crama, Yves ULg; Pironet, Thierry ULg

E-print/Working paper (2014)

In this research, we want to investigate optimization techniques for a generic load assignment problem including a limited fleet of vehicles within a full-truck-load (FTL) multi-period setting including ... [more ▼]

In this research, we want to investigate optimization techniques for a generic load assignment problem including a limited fleet of vehicles within a full-truck-load (FTL) multi-period setting including forecasts on load availability. Several policies are generated from simple heuristics through state of the art approaches such as consensus and restricted expectation algorithms up to the optimization of a subtree of scenarios. Moreover, myopic and a-posteriori deterministic optimizations (including no or fully revealed information) set bounds for policies performance comparisons. Tests are performed for different graphs sizes and sparsity, several distribution laws and number of loads. Performances are compared statistically over paired samples. The robustness of performing policies against a false valuation of the probability distribution is also analyzed. [less ▲]

Detailed reference viewed: 55 (8 ULg)
Full Text
See detailBridging the gap from Academia to business : how companies can help to bridge the gap ?
Morant, Michel ULg

Conference (2014, September 23)

The contribution describes how large companies can help technology spin offs to get on the market, by explaining some examples form ULg spin off portfolio

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailIRGA GAS SAMPLING SYSTEM DIMENSIONING: LABORATORY AND FIELD EXPERIMENTS
De Ligne, Anne ULg; Joly, Lilian; Cousin, Julien et al

Poster (2014, September 23)

The gas sampling system (GSS), which carries air from the sampling point to the IRGA, is an essential component of the eddy covariance system. It has to meet several constraints, among which minimizing ... [more ▼]

The gas sampling system (GSS), which carries air from the sampling point to the IRGA, is an essential component of the eddy covariance system. It has to meet several constraints, among which minimizing high frequency attenuation of concentration measurement and keeping pressure drop in the measurement cell in an acceptable range. Rain cup, filters, tubes and pumps are key elements of this system and need proper dimensioning. The elaboration of the ICOS protocol for IRGA required such dimensioning and optimization. Laboratory and field measurements were carried out with this aim. In the laboratory, a dynamic calibration bench was developed to investigate experimentally the pressure drop and the concentration fluctuation attenuation caused by different filters. In the field, three LI-7200 equipped with different GSS were installed and run at the Dorinne Terrestrial Observatory (ICOS-Belgium). Main experiment conclusions were that: • The shape and size of the rain cup has a critical impact on cut off frequencies • The filter porosity and size has a critical impact on pressure drop • Filter heating is necessary in order to avoid condensation and filter blocking These experiments led to the definition of the GSS functioning range that is finally proposed in the ICOS IRGA protocol. [less ▲]

Detailed reference viewed: 12 (3 ULg)
Full Text
See detailBehavioral ecology and commensal long-tailed macaque (Macaca fascicularis) populations in Bali, Indonesia: impact of anthropic factors
Brotcorne, Fany ULg

Doctoral thesis (2014)

Coexistence between humans and wildlife is one of the major challenge to biodiversity conservation in the onset of this new millennium. In addition to the development of protected areas providing refuges ... [more ▼]

Coexistence between humans and wildlife is one of the major challenge to biodiversity conservation in the onset of this new millennium. In addition to the development of protected areas providing refuges for wildlife populations, another option relies on the sharing of space, i.e., tolerating wildlife living alongside human populations in non-protected interface zones. During the last century, massive human encroachment into wildlife natural habitat has led to an increasing number of worldwide interface zones and a consecutive intensification of the human-wildlife conflict which is likely to escalate further as human populations rapidly expand. However, conflict does not account for all the scenarios since diverse forms of interaction between humans and wildlife exist. The human-nonhuman primate commensalism is one of these possible interspecies associations. Commensal (or synanthropic) primates are free-ranging populations ecologically associated with humans in anthropogenic habitats and taking advantage of human food, waste or crops to supplement their diet. In Bali, Indonesia, humans and long-tailed macaques (Macaca fascicularis) already have a long history of coexistence. The forest-agricultural matrix landscape of the island and the numerous religious Hindu temples provide habitat patches for macaques sometimes living in very close proximity to humans. The opportunistic style of this species enables it to exploit numerous habitat types. However little is known about the ways anthropic factors impact its behavioral ecology. Our intention was to conduct a comparative study which would investigate whether anthropic factors were potential drivers of the behavioral ecology and population dynamics of Balinese macaques. During a two-year period in the field (between 2009 and 2013), using a protocol including three populations of Balinese macaques made of ten social groups, we documented variations in the activity, dietary, ranging and demographic patterns between populations. We systematically investigated the anthropogenic influences (i.e. human food provisioning degree and habitat anthropization level) on those variations, and we questioned the biological significance of the responses in terms of costs and benefits. While daily following each social group of macaques, we collected spatial, behavioral and botanical data, and we further conducted bi-annual demographic census in order to estimate the status and demographic trends of the study groups. Finally, our interest was to link our results with applied concerns regarding the management of these populations interacting with humans, while taking into account the implications of these interactions from the human point of view. We found a remarkable eco-behavioral diversity between our studied populations. Human food was a central component of their ecology, macaques preferentially exploiting this resource when available while retaining their abilities to forage on natural resources. The inclination for human food was optimal for macaques as it maximized their energy intake while minimizing the time expended for food acquisition. Therefore, they adjusted their activity budget according to the proportions of human food consumed. The free time available from relaxed foraging constraints was invested into resting and social activities. Macaques were flexible in their movements, making them successful in exploiting natural forest areas as well as highly anthropogenic habitats. However, increased social tension was a cost that stemmed from high-density situations induced by excessive anthropization of their habitat. We showed that, although predation risk partially influenced the selection of sleeping trees, proximity to human settlements appeared to be the most influential factor in the essential process of sleeping site choice by long-tailed macaques living at the edge of the forest and anthropogenic zones. Demographic data provide essential information to assess the status of a population and the long-term impacts of human pressures. Overall, our three studied populations displayed good reproductive performances and positive growth rates, probably due to the human food consumed. Indeed, we showed that the human food abundance in tourist sites may have diminished the density-dependence mechanism on macaques’ birth rates, to eventually inflate the size of populations. When combined with a high level of habitat anthropization, these effects have led to high local densities and even overcrowded situations with associated costs regarding within and between-group social tension and epidemic risks. In this framework, we documented the demographic and social impacts of a Streptococcus outbreak which occurred in the Ubud population in 2012. The pre- and post-epidemic study showed that macaques modified their social dynamics following a significant mortality in certain groups. This study emphasized the role of pathogens in regulating primate populations living in zones of interface with humans. Our research also contributed to identify solutions regarding management of these populations increasingly interacting with humans in Bali. We notably provided preliminary evidence that vasectomy, as sterilization technique to control for overpopulation, had no negative side-effects on social and sexual behaviors of male macaques. Finally, we assessed the effect of a ten-year management regime at the Ubud Monkey Forest, using an ethnoprimatological approach. We showed that the aggressiveness of macaques towards visitors had been effectively reduced and the high tolerance of local people towards macaques was determined by economic and cultural benefits deriving from the macaque presence. However, we also identified men and adult or subadult male macaques as the most exposed groups to a potential risk of cross-species pathogen transmission given the frequency of close physical contact interactions at this site. [less ▲]

Detailed reference viewed: 202 (21 ULg)
See detailObjets réels et objets idéaux. Sur les objets d’ordre supérieur II
Zincq, Aurélien ULg

Conference (2014, September 23)

Detailed reference viewed: 17 (1 ULg)
Full Text
See detailModélisation et étude expérimentale du comportement de Saccharomyces cerevisiae (boulardii) lors de l'extrapolation du procédé à des bioréacteurs de volume industriel
Lejeune, Annick ULg

Doctoral thesis (2014)

L’extrapolation de la production d’un microorganisme est un problème complexe qui prend en compte de nombreux paramètres. En effet, les paramètres opératoires induisent des conditions environnementales ... [more ▼]

L’extrapolation de la production d’un microorganisme est un problème complexe qui prend en compte de nombreux paramètres. En effet, les paramètres opératoires induisent des conditions environnementales qui peuvent être dommageables pour les cellules se développant dans le réacteur. Il est donc important de prendre en compte le côté génie chimique pour comprendre quelles sont les conditions hydrodynamiques présentes dans le réacteur et ensuite s’attacher à étudier la réponse des cellules vis-à-vis de ces conditions. Ce travail se place dans le cas particulier de la production de biomasse de Saccharomyces cerevisiae (boulardii). Dans ce cas, le point critique est l’ajout de la solution concentrée de substrat dans le réacteur. L’utilisation de réacteurs scale-down a permis d’étudier différents cas de conditions hydrodynamiques défavorables, ainsi que leurs impacts sur différents paramètres. Dans un premier temps, l’étude des paramètres ségrégés (concentration en biomasse, en co-produits…) a montré, notamment, une diminution du rendement et une augmentation de la concentration en éthanol. Ensuite, l’étude s’est placée au niveau cellulaire avec l’utilisation de souches exprimant une protéine recombinante fluorescente et de marqueurs cellulaires fluorescents, couplée à la cytométrie en flux. Ces techniques ont permis de mettre en évidence la présence de différentes sous-populations cellulaires, ainsi que l’apparition du phénomène de résistance cellulaire aux stress lors de la production en réacteurs scale-down. L’importance du choix de la méthode de traitement des données cytométriques a également été débattue. Ce travail a abordé différents domaines pour tenter de mieux comprendre la réponse cellulaire aux fluctuations des conditions environnementales ressenties par Saccharomyces cerevisiae (boulardii) lors de productions en réacteurs mimant les conditions hydrodynamiques des réacteurs de grands volumes. [less ▲]

Detailed reference viewed: 50 (8 ULg)
See detailVers une vision plus positive de la maladie d'Alzheimer: Enjeux cliniques et éthique
Adam, Stéphane ULg

Conference given outside the academic context (2014)

Detailed reference viewed: 41 (3 ULg)