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See detailLes cuirasses latéritiques et autres formations ferrugineuses tropicales : Exemple du Haut Katanga méridional
Alexandre, Jean ULg

in Annalen. Geologische Wetenschappen = Annales - Musée Royal de l'Afrique Centrale. Sciences Géologiques (2002), 107

In Southern High Katanga, the ferruginous formations such as iron duricrusts and stone lines with lateritic nodules show a diversity as broad as in Western Africa. Bauxites are nevertheless almost absent ... [more ▼]

In Southern High Katanga, the ferruginous formations such as iron duricrusts and stone lines with lateritic nodules show a diversity as broad as in Western Africa. Bauxites are nevertheless almost absent proving that, here, aluminium does not contribute to the genesis of duricrust, leaving iron as the only responsible. Among that wide diversity, the indurated sands form a special case because of their dual origin. Because of a large porosity favouring a fast iron penetration and fixation, some of the sandy concretions or duricrusts may have a short history and some of them may even be very recent. Nevertheless the others have a genesis that fits in with the general longer scheme. The most frequent type of laterite crust is also the most complex one. Its facies is both nodular and vermicular. Several agents and climatic phases are involved in its formation : • A first planation surface with wide-open valleys where the water table lies near the surface induces favourable circumstances for the next step; • In such circumstances, nodules are shaped in the mottled soil horizon. One exceptionally well-preserved site evidences the proximity between mottles (the nodules to be) and water table level at the end of the dry season; • A revival of erosion enhances river down cutting which in turn lowers the water table so that termites can reach the mottled horizon; • Nodules are mechanically concentrated by elimination of the non-indurated zones (relative accumulation): within the soil, by termites (on shaly rocks), at the surface by run off (often, on sandy rocks, unfavourable to termites activity); X • Finally the ran off extends to both types of rock and denudes the indurated zone; • A ferruginous coating forms on different substrates : upper laterite surface, internal joints, termite galleries as well as on any gravel at the soil surface. The coating lies unbroken from one object to the other but the outer surface is frequently eroded. The superficial coating could be a rock varnish formed by bacteria during a desertic period. The coating of galleries partly inhibits bioturbation because they collapse no more. The network of the strengthened galleries constitutes an internal skeleton reinforcing the laterite mantle; • With the return of a less severe climate, termites from below the laterite mantle again bring up material. The resulting upper fine deposit often exceeds 2 meter. All those processes imply important climatic variations : • A steppe vegetation with a scanty grass cover favouring run off and planation; • A relatively arid climate for the coatings formation; • A contrasted seasonal regime, not so different from the present day climate (six months dry season) for vertical erosion and intense termite activity. The weathering of rocky materials except for the iron impregnated ones (nodules, ferricretes and so on) requires a humid climate. This is happening nowadays but the more humid Quaternary phases were more effective in that respect. The characteristics of the outer coatings (thickness, colour, conservation state of the included quartz grains) allow us to identify four levels of ferricrete. Their succession is confirmed by the relative position of the coatings between them and by the correlated continental deposits. Because of their coatings, all those ferricretes are dated back to the Tertiary (because of the desertic climate needed for the formation of the rock varnish). Their levels overlook the Quaternary river terraces. The oldest ferricrete is quite different from the others. It shows neither nodules nor termite galleries. Its facies is thus very different from the nodular/vermiform of the three younger ones. It shows three facies, sometimes superimposed : pisolithic, massive or breccia-like. Moreover, the ferricrete of the corresponding level in West Africa contains bauxite. Its genesis is the result of a very different sequence of processes, some aggressive and linked to a humid climate with a great supply of iron and others resulting from more arid conditions producing the thick pisolith coatings. Ferruginous stone-lines present a wider variety of concretions than duricrast. Their upper part is the result of a concentration mainly by run off that occurred during several periods of the Quaternary. Cover loam is each time built up again by the termites from weathered rocks below the stone-line. The same phenomenon is seen on ferricretes. The soil profile where ferruginous formations can be seen consists of horizons of different ages. Weathering of saprolite and soil lifting are still active nowadays. Whereas some stone-line profiles are renewed at each Quaternary dry phase, the ferricrete profiles are build up during a long period of time extending from the Tertiary till now. A new definition of iron duricrast is proposed that is not based on weathering in depth or on the presence of aluminium [less ▲]

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See detailLes débats publics sur l’intégration et la diversité en Europe
Martiniello, Marco ULg

Scientific conference (2010, December 18)

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See detailLes débuts de la vie sur Terre, et ailleurs ?
Javaux, Emmanuelle ULg

Article for general public (2012)

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See detailLes défauts d'implantation placentaire et leurs conséquences sur la fonction endothéliale maternelle
Foidart, Jean-Michel ULg; Noël, Agnès ULg; Chantraine, Frédéric ULg et al

in Bulletin Académique National de Médecine (2009), 193(5), 1059-66

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See detailLes déficits phonologiques des enfants francophones ayant des troubles spécifiques de développement du langage
Parisse, Christophe; Maillart, Christelle ULg

in Glossa (2004), 89

This study investigated the phonological expressive disorders of Frenchspeaking children with SLI. The main goal of this paper was to confirm whether children with SLI have limitations in phonological ... [more ▼]

This study investigated the phonological expressive disorders of Frenchspeaking children with SLI. The main goal of this paper was to confirm whether children with SLI have limitations in phonological ability even when they are compared with normally-developing children matched by MLU and phonemic inventory size. This was demonstrated by Bortoloni and Leonard (2000), Orsolini et coll. (2001), and Aguilar-Mediavilla et coll. (2002), which obtained the most detailed results in this direction, but it was never tested in French language. The second goal of the paper is to find out whether the characteristics of the French language are reflected in the nature of the children’s phonological disorder. In order to test this, the spontaneous language of 16 children with SLI and of 16 control children matched on MLU and phonemic inventory size (NLD group) was analysed using different measures bearing on utterances, words, syllables, or phonemes. In both SLI and NLD groups, the children were distributed in two different subgroups, on the basis of their MLU and phonemic inventory size. The results supported a specific limitation in the phonological abilities of French children with SLI, as was already demonstrated for English, Hebrew, Italian, and Spanish-Catalan. However, two unexpected results were also obtained. Firstly, a significant difference between children with SLI and control children could only be found for older children (MLU above 3), not for younger children with MLU below 3. This was true for all measures. This finding stresses out the importance of having a development perspective and has to be confirmed with longitudinal design. Secondly, deficits were much more important at the phoneme level than at the syllable level. This can be explained by the fact that the French language has a very homogenous pronunciation of syllables, which makes them easier to segment. [less ▲]

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See detailLes déplacements domicile-école
Halleux, Jean-Marie ULg; Lambotte, Jean-Marc ULg; Rixhon, Gilles ULg et al

in Verhetsel, A.; Van Hecke, E.; Thomas, I. (Eds.) et al Le mouvement pendulaire en Belgique : les déplacements domicile-lieu de travail, les déplacements domicile-école. Enquête Socio-économique 2001. Monographies (n°10) (2009)

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See detailLes dérivés tensioactifs de la glycine bétaïne: méthodes de synthèse et potentialités d'utilisation
Zakanda F. Nsimba; Paquot, Michel ULg; Lelo G.Mvumbi et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(4), 737-748

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See detailLes dermatoses aquatiques
Letot, Bernard; NIKKELS, Arjen ULg

in Skin Inc (2012), 15(3), 6-8

Les méduses que nous connaissons tous pour en avoir vues échouées sur les plages de nos vacances, appartiennent à la grande famille des coelentérés ou cnidaires, qui possèdent tous des cnidoblastes. Il s ... [more ▼]

Les méduses que nous connaissons tous pour en avoir vues échouées sur les plages de nos vacances, appartiennent à la grande famille des coelentérés ou cnidaires, qui possèdent tous des cnidoblastes. Il s'agit d'un appareil venimeux conçu pour leur alimentation, mais qui peut être nuisible pour l'homme, allant du simple désagrément à l'accident grave. Comment traiter ces cas? Certains poissons, que vos patients peuvent rencontrer lors de leurs ébats aquatiques, sont également venimeux et leurs piqûres peuvent être douloureuses. Les connaître permet de les éviter ou de soigner ceux qui en sont victimes. Les poissons-chirurgiens ont un mode de défense inattendu. Cet article résume les principales dermatoses aquatiques que les dermatologues sont susceptibles de rencontrer chez les patients après le retour des vacances. [less ▲]

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See detailLes dévotes isiaques et les atours de leur déesse
Veymiers, Richard ULg; Malaise, Michel

in Veymiers, Richard; Gasparini, Valentino (Eds.) The Greco-Roman Cults of Isis: Agents, Images and Practices. Proceedings of the VIth Conference of Isis Studies (Erfurt, May 6-8 – Liège, September 23-24, 2013) (in press)

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See detailLes différents stades de l'ischémie myocardique en IRM cardiaque de stress à l'adénosine
NCHIMI LONGANG, Alain ULg; BRISBOIS, Denis ULg

in Les différents stades de l'ischémie myocardique en IRM cardiaque de stress à l'adénosine (2008)

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See detailLes Dioxines
Focant, Jean-François ULg; De Pauw, Edwin ULg

Article for general public (1999)

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See detailLes doctrines/Doctrines
Dantinne, Michaël ULg

in Herzog Evans, Martine (Ed.) Transnational Criminolgy Manual (2010)

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See detailLes dossiers « Junge Literaturkritik » (littéralement « jeune critique littéraire ») – projet de cours avec les doctorants en littérature allemande dont les textes rédigés ont été publiés sur le site de la chaîne de télévision culturelle franco-allemande arte
Pontzen, Alexandra ULg

Learning material (2005)

Les dossiers « Junge Literaturkritik » (littéralement « jeune critique littéraire ») – projet de cours avec les doctorants en littérature allemande dont les textes rédigés ont été publiés sur le site de ... [more ▼]

Les dossiers « Junge Literaturkritik » (littéralement « jeune critique littéraire ») – projet de cours avec les doctorants en littérature allemande dont les textes rédigés ont été publiés sur le site de la chaîne de télévision culturelle franco-allemande arte [less ▲]

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See detailLes droits de l'homme ne peuvent pas tout résoudre
Frère, Bruno ULg

Article for general public (2010)

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See detailLes eaux continentales comme sources de gaz à effet de serre vers l’atmosphère : étude pilote dans 4 cours d’eau en Wallonie
Borges, Alberto ULg

Scientific conference (2012, October 25)

Les eaux continentales (fleuves et lacs) sont d’importantes composantes des cycles globaux du carbone et de l’azote. Elles transportent du carbone et de l’azote organique et inorganique des écosystèmes ... [more ▼]

Les eaux continentales (fleuves et lacs) sont d’importantes composantes des cycles globaux du carbone et de l’azote. Elles transportent du carbone et de l’azote organique et inorganique des écosystèmes terrestres vers les océans. Cependant, ce transport n’est pas passif et les eaux continentales produisent, dégradent, stockent et échangent du carbone et de l’azote avec l’atmosphère. Ainsi, les eaux continentales émettent du dioxyde de carbone (CO2), du méthane (CH4) et du protoxyde d’azote (N2O) vers l’atmosphère. Le CO2, CH4 et N2O sont les principaux gaz à effet de serre (GES) anthropiques, et le N2O est en plus le plus important agent anthropique de destruction de la couche d’ozone. L’Unité d’Océanographie Chimique a mené une étude pilote dans quatre cours d’eau à proximité de la ville Liège (Meuse, Ourthe, Geer et Ruisseau du Blanc Gravier) qui ont été étudiés afin de décrire la dynamique du CO2, CH4 et N2O et d’en estimer les flux émis des eaux de surface vers l’atmosphère. Les conditions ainsi que les résultats de l’étude seront présentés lors de cet exposé. [less ▲]

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