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See detailÉtude fréquentielle de données via la transformée en ondelette : application aux cycles climatiques
Mabille, Georges ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg et al

in Bulletin de la Société Géographique de Liège (2012), 58

Understanding the climate requires a complex study of time series connected to weather parameters. The climatologist frequently applies signal processing tools and often uses the harmonic analysis and the ... [more ▼]

Understanding the climate requires a complex study of time series connected to weather parameters. The climatologist frequently applies signal processing tools and often uses the harmonic analysis and the Fourier transform. This article is dedicated to the description of a new tool, elaborated by mathematicians, which completes the outfit of intruments intended for signal analysis. The scale spectrum, which synthetizes a part of the information supplied by the wavelet transform, possesses the property to reveal pseudo-cycles which evolves around an average period. When applied to air surface temperature time series obtained from more than one hundred weather stations, to reanalysis data and to climatic indices which characterize the tropospheric flows, the wavelet transforms and the scale spectra reveal cycles with periods close to 30 months and 42 months. The Solar parameters analysis also leads to the existence of pseudo-cycles with frequencies corresponding to those found in the temperature time series and climatic indices. [less ▲]

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See detailEtude génétique de l'intelligence manipulatoire chez des enfants africains à l'aide des dispositifs de Rey
Richelle, Marc ULg

in International Journal of Psychology (1966), 1(4), 273-287

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See detailEtude génétique de la distance de dispersion du tali (Erythrophleum suaveolens (Guill& Perr.) Brenan) en forêt dense humide tropicale
Gillet, Pauline ULg

Master's dissertation (2012)

The study of the regeneration of tropical timber species is intended to design appropriate conservation strategies and to enable the sustainable exploitation of their populations. This study based on ... [more ▼]

The study of the regeneration of tropical timber species is intended to design appropriate conservation strategies and to enable the sustainable exploitation of their populations. This study based on sample collection made in Cameroon and Gabon in two forest contexts with different population densities, has allowed us to characterize gene flow from tali (Erythrophleum suaveolens) using molecular markers. Direct methods based on analyzes of kinship and proceeding by maximum likelihood, as well as indirect methods based on the heterogeneity of the pollen pool and on the spatial structure of the population, allowed the reconstruction of the events of seed and pollen dispersal. The results show that the species present an exponential distribution of pollen and seeds, the average distance of pollen dispersal would be 240 meters and that of seeds would be 135 meters. We also defined a minimum effective density of 0.09 to 0.2 individuals per hectare depending on the forest context studied. The tali has a rate of inbreeding of 25% to 30 % coupled with strong inbreeding depression. These two features are most likely to affect the regeneration of the species in case of overexploitation. [less ▲]

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See detailEtude génétique et anatomopathologique du syndrome de McCune-Albright chez l'adulte
Beckers, Albert ULg; Burlacu, Maria Cristina ULg; Thiry, Albert ULg et al

in Annales d'Endocrinologie (2010, September), 71(5), 345

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See detailEtude génétique et anatomopathologique du syndrome de McCune-Albright chez l'adulte
Beckers, Albert ULg; Burlacu, M.; Thiry, Albert ULg et al

in 27ème Congrès de la Société Française d'Endocrinologie - Deauville, 29 septembre - 2 octobre 2010 (2010, September)

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See detailEtude génétique Viola calaminaria (Dc) Lej. à l'aide de marqueur moléculaire du type RAPD
Bizoux, Jean-Philippe ULg

Master of advanced studies dissertation (2003)

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See detailEtude géologique de la carrière de Cielle (Rendeux, Dévonien inférieur)
Poty, Edouard ULg; Mottequin, Bernard ULg; Barchy, Laurent et al

Report (2006)

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See detailEtude géologique du Sous-groupe de Mpioka dans le massif de Nionga. (Bas-congo, RDC)
Kabamba Baludikay, Blaise ULg

Master's dissertation (2007)

The massif of Nionga is located in the province of Bas-Congo in the Democratic Republic of the Congo. The subgroup of Mpioka is lithostratigraphiquement to Group West-Congolien (566 Ma). And Zadinien ... [more ▼]

The massif of Nionga is located in the province of Bas-Congo in the Democratic Republic of the Congo. The subgroup of Mpioka is lithostratigraphiquement to Group West-Congolien (566 Ma). And Zadinien, Mayumbien and West-Congolien together form what is called the supergroup West Congo (L. Tack et al., 2001). <br />This work objectives were to determine: the petrographical types of rocks of this subgroup of Mpioka, the area source of debris, the mechanism and the physico-chemical conditions of the medium of filing. <br />The interest of this study resided in the fact that the massif of Nionga is located in the Mayumbe ditch where manifestations lithologic and tectonic chain West-Congo are recorded. And into this ditch, extending south of Gabon to northern Angola from Congo-Brazzaville and the Democratic Republic of Congo, the massif of Nionga is the only sector where the subgroup of Mpioka outcrops in low vertical and lateral extension. As such, this massif was clear to understand, after the chemical stage schisto-limestone, the dynamics of the basin during the filing of the detrital episode of Mpioka in Bas-Congo. <br />This study allowed us to conclude that the subgroup of Mpioka located in the Nionga massif is formed of clay and sandstone lithofacies, and that it is a rythmite deposited on a flat tidal where driveways come tides have alternately deposited sand (bench of sandstone and sandstone beds - average energy) and sludge (shoals of shales and clay beds - low energy). A medium scale, observed the intercalation of sandstone in shale and on a small scale, the alternation of the quartz-clay laminae. The slump structures resulting rupture and the transport of sediment layers thus producing intertidal sediments in the flats mixtures chaotic types and channels of rivers; rolled sludge have a zonation that would be the result of differences; in the texture, composition and colouring of rocks solid bedding would be due to a very rapid sedimentation in the flats intertidal. Oxidizing conditions from the middle of deposit are translated by the red hue of these rocks. And this colour is due to the presence of ferric iron (hematite) which is common in this massif. Apart from the neoformations chloritic, ironstone, and calcite, quartz sediments of the Mpioka subgroup come from erosion of metamorphic rocks, very rugged, Transmazonien and Kimezien. <br />Correlated with the Pi of the subgroup of Mpioka term in Bungo basin (Angola), this sub-group flush in the massif of Nionga testifies to the existence of a shoal during the filing of Pc, Pe, Pk and Pm and a deflection crustal during the filing of Pi. This subgroup is also between two sedimentary gaps, and is transgressive on Schisto-limestone in the Mayumbe ditch where the level passed successively (from Pc to Pe) regression to a breach (of Pe to Pi) and finally to a regression (of Pi in Pm). [less ▲]

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See detailEtude géologique en vue de la réfection et démolition partielle d'un mur de soutènement, gare de Dinant
Delvoie, Simon ULg; Collin, Frédéric ULg

Report (2013)

Réalisation de trois forages carottés verticaux et 6 forages carottés horizontaux afin de déterminer l'épaisseur de sédiments meubles en tête de paroi, le type de roche en présence et son état de ... [more ▼]

Réalisation de trois forages carottés verticaux et 6 forages carottés horizontaux afin de déterminer l'épaisseur de sédiments meubles en tête de paroi, le type de roche en présence et son état de fracturation, ainsi que la présence de vides en arrière du mur de soutènement. Cette analyse a pour objectif de proposer un avis sur la stabilité du massif en arrière du mur de soutènement en vue de sa réfection et de sa démolition partielle. [less ▲]

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See detailEtude géomorphologique des barrages de travertin du Hoyoux
Franco, Bruno ULg; Houbrechts, Geoffrey ULg; Van Campenhout, Jean ULg et al

in Bulletin de la Société Géographique de Liège (2008)

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See detailEtude gravimétrique de grande profondeur en Campine en vue de déterminer la structure du substratum primaire
Dassargues, Alain ULg; Halleux, Lucien; Monjoie, Albéric

Report (1984)

Detailed reference viewed: 11 (0 ULg)