Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
See detailDynamik an Flüssig-Flüssig-Phasengrenzen
Schmäh, M; Schott, R; Pfennig, Andreas ULg

Conference (2002)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailLes dynamines MX et leur activité anti-influenza.
Garigliany, Mutien-Marie ULg; Zecchinon, Laurent; Cloquette, Karine et al

Poster (2008, September)

Detailed reference viewed: 7 (2 ULg)
Full Text
See detailDynamique associative et réduction de la pauvreté rurale: une étude comparative de villages inégalement couverts par des Organisations Non Gouvernementales dans la province du Bandundu et dans l’hinterland de Kinshasa.
Nganda Afumba, Jean Pierre ULg

Doctoral thesis (2012)

Comme bon nombre de pays en développement, la République Démocratique du Congo observe, depuis le début des années 90, un développement sans précédent du mouvement associatif, particulièrement des ... [more ▼]

Comme bon nombre de pays en développement, la République Démocratique du Congo observe, depuis le début des années 90, un développement sans précédent du mouvement associatif, particulièrement des organisations non gouvernementales de développement. Dans un environnement où les pouvoirs publics sont quasi inexistants, ces dernières sont considérées par certains comme des instruments efficaces de réduction de la pauvreté, et par d’autres comme des opportunistes évoluant aux dépens de la misère des gens. La présente recherche se propose de faire une étude comparative entre, d’une part, des ménages de deux villages de l’hinterland de Kinshasa largement couverts par des ONG, et d’autre part, des ménages de deux autres villages dans le Bandundu ne bénéficiant d’aucune intervention d’ONG. Cette étude a pour but la compréhension, l’analyse et l’appréciation empirique de la pertinence de la stratégie de développement et de réduction de la pauvreté rurale orientée vers la promotion des organisations associatives du type ONG, et in fine suggère un outil susceptible d’améliorer les interventions visant la réduction de la pauvreté rurale. [less ▲]

Detailed reference viewed: 191 (23 ULg)
See detailDynamique d’expansion du Pic mar (Dendrocopos medius) en Belgique
Lehaire, François ULg

in Acte du 33 ième Colloque francophone d’ornithologie (2009, December)

Middle Spotted Woodpecker is one of the key species for which understanding the relationship with its habitat can have important implications for improving biodiversity-friendly management of hardwood ... [more ▼]

Middle Spotted Woodpecker is one of the key species for which understanding the relationship with its habitat can have important implications for improving biodiversity-friendly management of hardwood forests. This species is considered as an indicator of a forest ecosystem comprising a high proportion of mature trees and a botanical composition chiefly associated with oaks. For the last two decades, the Middle Spotted Woodpecker distribution range is expanding remarkably in the Walloon Region while, in contrast, other populations are either decreasing in the south-east of Europe or remain stable elsewhere in Europe. The study of this expansion range within the Walloon Region and of the forest habitats used therein is necessary to better assess the ecological requirements of the species. Based on more than 3,000 location data collected in the framework of the Atlas of breeding birds between 2001 and 2007, our study aimed at comparing forest habitats occupied by Middle Spotted Wood peckers between three geographically distinct areas, defined on the basis of the temporal evolution of the species’ distribution in the Walloon Region: the old distribution range, described from 1973-1977 and corresponding to the Ardennes and the Lorraine regions (southern Belgium), the transition range, defined in 1991-1992 and corresponding to the Fagne-Famenne region, and the expansion range, described in 2001-2007 and corresponding to the area colonized further north in the Loess region and Condroz. Overall, 418 woodpecker locations were crossed with 41 forest habitat variables available as part of the Regional Forest Inventory of the Walloon Region (IPRFW). Preliminary results suggest that, in agreement with previously known environmental requirements, forest stands presenting high densities in oak trees have been colonized by the Middle Spotted Woodpecker during its recent range expansion. However, the species is also expanding towards areas with a lower proportion of beech trees compared to the old distribution range, with a marked preference for forest stands presenting high tree diversity. We conclude that the Middle Spotted Woodpecker may exhibit a certain flexibility regarding its habitats requirements in Walloon forests, which led us to suggest several recommendations aimed at promoting the conservation of the species and of the forest biodiversity in general. [less ▲]

Detailed reference viewed: 62 (10 ULg)
Full Text
See detailDynamique d’une espèce ligneuse héliophile longévive dans un monde changeant le cas de Pericopsis elata (Harms) Meeuwen (Fabaceae) au sud-est du Cameroun
Bourland, Nils ULg; Doucet, Jean-Louis ULg

Scientific conference (2014, May 13)

Exposé sur l'origine et la dynamique des peuplements formés par Pericopsis elata au Sud-Est du Cameroon.

Detailed reference viewed: 23 (1 ULg)
Full Text
See detailDynamique d’une espèce ligneuse héliophile longévive dans un monde changeant : le cas de Pericopsis elata (Harms) Meeuwen (Fabaceae) au sud est du Cameroun
Bourland, Nils ULg

Doctoral thesis (2013)

The Central African forests are characterized by high species richness. While little light generally reaches their litter layer, among the species encountered are major long-lived light-demanding logged ... [more ▼]

The Central African forests are characterized by high species richness. While little light generally reaches their litter layer, among the species encountered are major long-lived light-demanding logged trees. These species may have established in the past because of large disturbances. Indeed, major climate changes have occurred in the past few millennia, in some areas coupled with strong human occupations. Among these light-demanding species we find the assamela / afrormosia (Pericopsis elata (Harms) Meeuwen, Fabaceae), a large high trading value tree of African semi-deciduous moist forests. Nowadays this logged species suffers from significant regeneration problems on its natural range from Ghana to the Democratic Republic of Congo. Therefore, it is included in CITES Appendix II and is recorded as “Endangered A1cd” on the IUCN Red List. No convincing solution can be found in the available scientific literature to overcome the deficiency of its regeneration. In addition, little or no information is available describing ca. its population dynamics, genetics, silviculture or the probable origin of its stands. It is in this context that the present PhD was undertaken. In this study, we have adopted a multidisciplinary approach to understanding the dynamics of this population rich in long-lived light-demanding species logged in the Congo basin. Moreover, we have suggested ways for their management and conservation in a changing world. To do so, we have adopted as a study-model the case of P. elata in southeastern Cameroon. The main results of the study show that, on a local scale, physico-chemical soil parameters have no influence on the presence or absence of this clustered species. However, on the same scale, large quantities of charcoal were found in the soil, mainly inside those clusters. The anthracological analysis has also shown that the vegetation at the time of the burn was similar to that of today. Numerous fragments of pottery were also found in the top soil layers only inside clusters formed by the species. Finally, some 14C datings go back to ca. 200 years BP, which is approximately the average age of concerned clusters. This body of evidence leads us to conclude on an ancient form of shifting cultivation as the most likely origin of the assamela populations currently present in southeastern Cameroon. In addition to its current population structure within the study area, several parameters controlling its population dynamics were estimated. While the annualized natural mortality of the species reaches about 1%, its average diameter growth rate is 0.31 cm.year-1, which is a relatively low value compared to other long-lived light-demanding species. Selective logging seems to have only a light influence on the behavior of the species. On the other hand, the impact of logging on its seed tree populations is only ca. 12%. Each seed tree bears fruit on average only once every five years. The minimum diameter of reproduction and the effective flowering diameter were respectively 32 and 37 cm. The recovery rate, varying greatly from one country to another, is more than 100% in Cameroon, where the conservation status assigned to the species seems excessive. A sufficient regeneration by planting should allow the perpetuation of the assamela populations in the long run, as with other major logged light-demanding trees. [less ▲]

Detailed reference viewed: 295 (78 ULg)
Full Text
See detailDynamique d'une expérience spatiale: analyses et vérifications
Defise, Jean-Marc ULg

in Actes du 3ième Congrès national Belge de Mécanique Théorique et Appliquée (1994)

L'expérience EIT est un des nombreux instruments qui font partie de la charge utile du satellite SOHO de l'Agence Spatiale Européenne. A ce titre, un programme complet d'analyse et de vérification a été ... [more ▼]

L'expérience EIT est un des nombreux instruments qui font partie de la charge utile du satellite SOHO de l'Agence Spatiale Européenne. A ce titre, un programme complet d'analyse et de vérification a été mis en oeuvre pour démontrer la bonne tenue dynamique de l'instrument, sur base des spécifications imposées par l'ESA. Par ailleurs, le télescope est composé de plusieurs sous-systèmes réalisés et testés dans des laboratoires différents. Chaque élément est qualifié séparément, avant intégration du modèle de vol. Une approche de type "proto-flight" a été adoptée. Cet article décrit les principaux résultats des analyses et des essais effectués dans le cadre de ce projet. [less ▲]

Detailed reference viewed: 19 (6 ULg)
Full Text
See detailDynamique d'une population de martins pêcheurs (Alcedo atthis) en Belgique en liaison avec la gestion des cours d'eau.
Libois, Roland ULg

in Actes du 1er colloque international "gestion et préservation des ressoures en eau" (2004, September)

Detailed reference viewed: 21 (0 ULg)
Full Text
Peer Reviewed
See detailDynamique de défense du nid chez Symphodus ocellatus (Forsskål, 1775), poisson labridé méditerranéen. I. Comportements agonistiques entre le mâle territorial nidificateur et cinq autres espèces de labridés
Ylieff, Marc ULg; Michel, Christian ULg; Voss, Jacques

in Cahiers d'Ethologie (1997), 17(1), 49-74

This research in the field consists of a study of interspecific agonistic behaviour of territorial male in Symphodus ocellatus. This behaviour is useful for brood and nest defense. Four questions ... [more ▼]

This research in the field consists of a study of interspecific agonistic behaviour of territorial male in Symphodus ocellatus. This behaviour is useful for brood and nest defense. Four questions involving Symphodus ocellatus towards S. tinca, S. mediterraneus, S. roissali, Thalassoma pavo et Coris julis were investigated. The questions of interest were: (1) aggressors or intruders motivations (predation of the brood (a) and/or territorial conflicts (b)), (2) the recognition of this or that species (recognition studied with selective attacks by territorial male), (3) the organ(s) of perception used for this recognition and (4) the importance of territorial male investment in nest defense; this role could ensure a successful reproduction of the species. Our observations and experimentations (tested labrid fishes presented to T. males) allow us to affirm that in S. ocellatus, nesting territorial males recognize the various tested labrid fishes; that the organ of perception used for social recognition is the visual channel; that spawn protection insured by territorial male, a task guided by his visual system, is necessary towards menace of his congeners, but also the other fishes living in his habitat. Nevertheless, if it’s becoming clear that the Mediterranean labrid fishes have the ability to recognize and preferentially interact with particular individuals, the answer of the question 1, concerning aggressors motivations, is not yet clearly known. [less ▲]

Detailed reference viewed: 56 (9 ULg)
Full Text
Peer Reviewed
See detailDynamique de défense du nid chez Symphodus ocellatus (Forsskål, 1775), poisson labridé méditerranéen. II. Comportements agressifs du mâle territorial nidificateur envers des mollusques gastéropodes
Ylieff, Marc ULg; Michel, Christian ULg; Voss, Jacques

in Cahiers d'Ethologie (1998), 18(1), 39-52

This field research examines aggressive behaviour towards gasteropod molluscs in nesting territorial male of Symphodus ocellatus. This behaviour is useful for brood and nest defense. Four questions ... [more ▼]

This field research examines aggressive behaviour towards gasteropod molluscs in nesting territorial male of Symphodus ocellatus. This behaviour is useful for brood and nest defense. Four questions involving Symphodus ocellatus towards gasteropod molluscs were investigated. Questions of interest were: (1) selective cleaning of the nest according to possible predation danger of molluscs on the eggs, (2) visual recognition of natural mollusc from artificially coloured lure, (3) colours discriminating abilities by the visual system and, more generally (4) the importance of territorial male investment in nest defense; this role could ensure a successful reproduction of the species. Our observations and experimentations (coloured dummies) allow us to conclude that in Symphodus ocellatus, nesting territorial males clean every time their nest, any gasteropod mollusc species whatever; that they have sufficient knowledge of their usual biological environment to be able to discriminate a gasteropod mollusc from a dummy; that the organ of perception used for social recognition is the visual channel constituted by a neural system competent to perceive colours finely , a special quality which support the theory about the use of one preferential colour (red for S.ocellatus) for visual communication; that fry protection insured by territorial male, a task guided by his visual system, is necessary considering dangers from some gasteropod molluscs living in his habitat. [less ▲]

Detailed reference viewed: 44 (10 ULg)
See detailDynamique de l'adaptation au temps et modèle de l'horloge interne
Ferrara, André ULg

Doctoral thesis (1999)

Detailed reference viewed: 75 (15 ULg)
Full Text
Peer Reviewed
See detailDynamique de l'espace architectural : force, vitesse, déplacement dans l'oeuvre de Le Corbusier
Steinmetz, Rudy ULg

in Revue Philosophique de Louvain (2015, August), Tome 113(3), 425-447

Detailed reference viewed: 65 (1 ULg)
Full Text
Peer Reviewed
See detailDynamique de la filière viande de brousse dans la partie continentale du Rio Muni en Guinée équatoriale
Njikam Nsangou, Ibrahim ULg

in Tropicultura (2004), 22(4), 204-210

The aim of this study was to do surveys about bush meat networks around urban centers near the Monte Alen National Park in Equatorial Guinea. During 8 weeks, in the Mundoasi market, one of two principal ... [more ▼]

The aim of this study was to do surveys about bush meat networks around urban centers near the Monte Alen National Park in Equatorial Guinea. During 8 weeks, in the Mundoasi market, one of two principal market of Bata, 4328 wild animal carcases have been indexed, representating 22,600 kg of biomass. A total of 48 animals species have been identified, including 14 which hunting are prohibited. The mammals represent 91.87% of total number with 3 dominants orders, ungulates (37.7%), primates (28.6%) and rodents (18%). The duiker (Cephalophus), the African Brushtailed Porcupine and Guenon are the most important. The district of Niefang, Bata and Evinayong are the principal sources of supply. Hunting with gun becomes very important, follow by snaring, a very wasteful method. Despite that this business squarely growth, signs of wildlife decrease are perceptible, showing evidence of overexploitation. As far as Monte Alen National Park is concerned, this study shows the positive effects of this protected area as wildlife reservoir for peripheral hunting zones. [less ▲]

Detailed reference viewed: 47 (7 ULg)
Full Text
See detailDynamique de la haute atmosphère de Vénus
Stiepen, Arnaud ULg

Book published by Editions Universitaires Européennes (2014)

Detailed reference viewed: 50 (3 ULg)