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See detailControl of key pecking by the duration of a visual stimulus
Perikel, J. J.; Richelle, Marc ULg; Maurissen, J.

in Journal of the Experimental Analysis of Behavior (1974), 22(1), 131-134

Pigeons' key peck were brought under the control of the duration of a visual stimulus in one-key and two-key procedures. In the one-key procedure, pecks were reinforeced after presentations of a long ... [more ▼]

Pigeons' key peck were brought under the control of the duration of a visual stimulus in one-key and two-key procedures. In the one-key procedure, pecks were reinforeced after presentations of a long-duration stimulus but not after presentations of a short-duration stimulus. In the two-key procedure, left-key pecks were reinforced after the long-duration stimulus and right-key pecks after the short-duration stimulus. In both procedures, the long-duration stimulus was 10 sec, and the short-duration stimulus was increased from 1 to 8 sec in1-sec steps. Discriminative control developed with both procedures, but with greater acuracy in the two-key procedures, in which a difference threshold was obtained at short-duration values between 7 and 8 sec, or about 2.5 sec shorter than the long-duration stimulus. [less ▲]

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See detailThe stratigraphical significance of the Protognathodus Fauna from Stockum (Devonian - Carboniferous Boundary, Rhenish Schiefergebirge).
Alberti, H; Groos-Uffenorde, H; Streel, Maurice ULg et al

in Newsletter on Stratigraphy (1974), 3(4), 263-276

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See detailLes conduites créatives: Essai d'exploration expérimentale
Richelle, Marc ULg; Botson, Claude

Book published by Ministère de l'Education Nationale (1974)

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See detailLe behaviorisme aujourd'hui: I.Méthodes de conditionnement et théorie du comportement
Richelle, Marc ULg

in Psychologica Belgica (1974), 14(2), 127-143

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See detailSimilitude des assemblages de spores d'Europe, d'Afrique du Nord et d'Amérique du Nord au Dévonien terminal.
Streel, Maurice ULg

in Sciences Géologiques. Bulletin (1974), 27(1-2), 25-38

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See detailUne réalisation en cours: la réserve de Seilles
Libois, Roland ULg; Serusiaux, E

in Bulletin des Réserves Naturelles et Ornithologiques de Belgique (1974), 21

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See detailAnalyse dynamique des systèmes hydroélastiques de révolution par la méthode des éléments finis. Application à l'étude du phénomène "POGO" dans les lanceurs à ergols liquides.
Debongnie, Jean-François ULg; HUCK, A.

in Collection des publications de la Faculté des Sciences Appliquées, Université de Liège (1974), 50

The small oscillations of elastic containers partially filled with liquids are studied. After a brief review of the previously published work on this subject, a new variational formulation of the problem ... [more ▼]

The small oscillations of elastic containers partially filled with liquids are studied. After a brief review of the previously published work on this subject, a new variational formulation of the problem is presented. The application uses the finite element method and a new algorithm of solution is proposed. The accuracy of the method is illustrated by several examples including a two tanks launcher structure. [less ▲]

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See detailPalynology and Ostracode distribution in the Upper Devonian and basal Dinantian of Belgium and their dependence on sedimentary facies.
Becker, G; Bless, M.J.M.; Streel, Maurice ULg et al

in Mededelingen - Rijks Geologische Dienst (1974), 25(2), 9-99

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See detailPalynologie des stratotypes du Dévonien et du Carbonifère inférieur de l’Europe occidentale.
Streel, Maurice ULg

in Académie des sciences de l'URSS, Institut géologique (1974)

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See detailEtude au microscope électronique à balayage de cellules normales ou cancéreuses fixées et déshydratées par différentes méthodes
Heinen, Ernst ULg; Pierard, Gérald ULg

in Bulletin de l'Académie Royale de Médecine de Belgique (1974), 161

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See detailComment la Pénicilline tue les bactéries
Ghuysen, Jean-Marie ULg; Leyh-Bouille, Mélina; Frère, Jean-Marie ULg et al

in Annales de Microbiologie (1974), 125 B(2), 209-210

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