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See detailEtude du processus d’enseignement. Implications pour la méthodologie des activités physiques et sportives
Piéron, Maurice; Cloes, Marc ULg

in Jonnaert, Philippe (Ed.) Les didactiques, similitudes et spécificités (1991)

Les principes et recommandations de notre enseignement de la Méthodologie des Activités Physiques et Sportives (Piéron, 1985) découlent en ligne directe des observations faites en classe et des critères ... [more ▼]

Les principes et recommandations de notre enseignement de la Méthodologie des Activités Physiques et Sportives (Piéron, 1985) découlent en ligne directe des observations faites en classe et des critères de réussite identifiés par les études de type processus-produit ainsi que par les comparaisons d'experts et de débutants (Piéron, 1988). Notre présentation comportera deux parties étroitement liées. Dans la première, nous rappellerons brièvement le modèle fondamental décrivant le fonctionnement de l'enseignement. Nous distinguerons les phases du déroulement de l'action pédagogique et en soulignerons les aspects spécifiques à l'enseignement des activités physiques. Dans la seconde, nous exposerons les objectifs et paradigmes de recherche utilisés dans l'observation systématique de l'enseignement et leurs implications dans le cadre de la méthodologie des activités physiques. [less ▲]

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See detailEtude du processus d'internalisation du récepteur mutant NPY Y1 ∆32
Cherrier, Thomas ULg

Master of advanced studies dissertation (2005)

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See detailL'étude du récit interactif : épistémologie et constitution du corpus
Hurel, Pierre-Yves ULg

Conference (2013, May 16)

Réflexions sur la constitution d'un corpus hétérogène dans l'étude du récit interactif (jeux vidéo, hypertextes, web documentaires, jeux de rôle, etc.)

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See detailEtude du recyclage de l'eau résiduaire dans la flottation des minerais oxydés cuprocobaltifères du gisement de Luiswishi
Shengo Lutandula, Michel ULg

Doctoral thesis (2014)

The present work aims at improving practices in the management of wastewater from flotation of ores in the Katanga province and suggests the recycling considering its advantages on the environment ... [more ▼]

The present work aims at improving practices in the management of wastewater from flotation of ores in the Katanga province and suggests the recycling considering its advantages on the environment safeguarding, the sustainable management of hydric resources and the economy of flotation reagents standpoint. It focuses on the determination of the best process water-recycling rate in flotation of copper - cobalt oxidised ores from the Luiswishi deposit and on the explanation of phenomena implicated in the depression of malachite and heterogenite in the recycled water presence. The studied ores have been sulphidised (NaSH) prior to flotation with KAX using the process water recovered from the industrial effluents and a Lab scale replication of the New Concentrator in Kipushi (NCK) flow sheet to simulate the full-size plant operations. The following methodological approach has been adopted: • The lab flotation tests of the pulps originating from the NCK grinding circuit while varying the proportion of the recycled process water added to the feed water in view to determine the proportion which gives a concentrate grading at least 2% Co at the recovery of 80% and at least 7% Co at the recovery of 60% respectively at the rougher and cleaner stages; • The study of the effects from the recycled water chemical components on flotation of malachite and heterogenite through flotation of the studied ores in the presence of S2O32-, SO42-, HCO3-, Ca2+ and Mg2+ introduced in the feed water (demineralised water) through dissolution of their analytical graded-salts and based on the follow-up of the Cu-Co recovery and the roughing flotation concentrates mineralogical analysis by the polarised light microscopy, the X- rays diffraction and the scanning electron microscopy; • The study of the behaviour of malachite and heterogenite based firstly on electrochemical investigations of the pulp (pH, Eh, Es and DO), the leaching tests and sulphidisation of malachite and heterogenite with NaSH in presence of S2O32-, SO42- and HCO3. Secondly, based on thermodynamical calculations for the establishment of the Pourbaix diagrams of the systems Cu(Co-Cu) – Chemical species – Water at 25 °C and the Drift spectroscopic analysis (4000 à 400 cm-1) of malachite after sulphidisation with NaSH and agitation with KAX in the presence of S2O32-, SO42- and HCO3-. The obtained results have shown that the process water recycling is successful when 20% of the recycled water is added to the feed water since one obtains a concentrate grading 2% Co at the recovery of 80% at the rougher stage. However, considering the significant drops in the grade and the recovery of cobalt in the concentrate observed at the cleaner stage, a proportion of 10% has been suggested as optimal for the overall flotation circuit because 82% cobalt were recovered at rougher stage bringing at the cleaner stage a concentrate grading 9.5% Co at the recovery of 63%. Beyond 10%, the process water recycling has proved detrimental to flotation efficiency owing to the build-up of chemical species (S2O32-, SO42-, HCO3-, Ca2+, Mg2+ and Cl-) in the feed water, which becomes corrosive and scaling leading to depression of malachite and heterogenite. This depression results from an increase in the valuable minerals hydrophilicity boosted-up by their strong dissolution in water in the presence of S2O32-, SO42 and HCO3- leading to alterations in their surface properties and the exaggerated liberation of copper and cobalt ions in solution responsible for the overconsumption of NaSH and KAX. [less ▲]

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See detailEtude du régime alimentaire du sanglier (Sus scrofa L.) dans les Ardennes belges
Palata Kabudi, Jean Claude; Fetter, Serge; Libois, Roland ULg et al

in Cahiers d'Ethologie (1987), 7(3), 223-246

The wild boar's diet is investigated in two forests of the Belgian Ardenne: the Nismes deciduous forest and the Transinne coniferous plantations. Two complementary approach are compared: analysis of ... [more ▼]

The wild boar's diet is investigated in two forests of the Belgian Ardenne: the Nismes deciduous forest and the Transinne coniferous plantations. Two complementary approach are compared: analysis of faeces collected throughout the year and analysis of stomach contents during the hunting season only. The faeces analysis method allows to follow the diet seasonal variations but conceals the occurence of some feed and minimizes the ingestion of vertebrates and of artificial fodder. It results from both approaches that wild boars are opportunist and omnivorous with an obvious tendency to herbivory. The human influence, direct (artificial supply) or indirect (neighbouring cultivated open fields, forest and game management, enclosure, lot of disturbances), plays the leading part in determining wild boar's diet and its food search. As a whole, plant products from natural origin come in second place in its diet whereas other feed always remain occasional, with the exception of acorn and beech mast when superabouding. A few suggestions for reducing wild boar's damage to crop and forests close the paper [less ▲]

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See detailEtude du régime alimentaire et la stratégie trophique saisonnière de la loutre d'Europe (Lutra lutra) sur l'oued Beht (Maroc)
Fareh, Mostafa; Libois, Roland ULg; Gmira, Najib et al

Conference (2012, May)

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See detailÉtude du régime et de la sélectivité alimentaire du grand cormoran (Phalacrocorax carbo) sur le lac Kivu (R.D. Congo)
Musema Bahizire, Altor; Libois, Roland ULg

in Annales des Sciences et Sciences Appliquées de l'Université Officielle de Bukavu (2010), 2

This contribution intends to give a preliminary view of the diet of the Cormorant on the lake Kivu. Fifty pellets were collected from August to October 2004 in a colony situated in Bukavu and analysed. A ... [more ▼]

This contribution intends to give a preliminary view of the diet of the Cormorant on the lake Kivu. Fifty pellets were collected from August to October 2004 in a colony situated in Bukavu and analysed. A reference collection of fish skull bones was also prepared and correlations between the length of some characteristic bones and the total length of the fish were computed, allowing the assessment of the length of each prey identified in the pellets. The cormorants eat mainly Haplochromis species (either in relative abundance or occurrences) but the biomass intake is dominated by the genera Tilapia and Oreochromis (together: 65 %). The importance of catfish (Clarias sp.) or barbels (Barbus sp.) is very small (< 4%, whatever the expression of the results). The sardine Limnothrissa miodon appears in 1 out of 5 pellets but its contribution in terms of biomass is negligible. Comparing the diet with the available resources, it appears that the cormorant is an opportunistic predator, taking almost all the available taxa (except Raiamas moorii) without selecting a particular one, except the big cichlids (genus Tilapia and Oreochromis). However, more than 90% of its preys are small fish measuring less than 10 cm. [less ▲]

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See detailEtude du reservoir genetique de la legumineuse alimentaire Phaseolus lunatus L. par l'analyse electrophoretique d'isozymes.
Maquet, A.; Wathelet, Bernard ULg; Baudoin, Jean-Pierre ULg

in Bulletin des Recherches Agronomiques de Gembloux (1994), 29(3),

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