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See detailExistence d'une prescription d'ordre naturelle projectivement invariante
Radoux, Fabian ULg

Master's dissertation (2003)

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See detailExistence de karsts en roches cristallines silicatées non carbonatées en Afrique sahélienne et équatoriale, implications hydrogéologiques
Willems, Luc ULg; Pouclet, André; Vicat, Jean-Paul

in Bulletin de la Société Géologique de France (2002), 173(4), 337-345

Various cavities studied in western Niger and South Cameroon show the existence of important karstic phenomena into metagabbros and gneisses. These large-sized eaves resulted from generalized dissolution ... [more ▼]

Various cavities studied in western Niger and South Cameroon show the existence of important karstic phenomena into metagabbros and gneisses. These large-sized eaves resulted from generalized dissolution of silicate formations in spite of their low solubility. Karstification is produced by deep hydrous transfer along lithological discontinuities and fracture net works. The existence of such caves has major implications in geomorphology, under either Sahelian and Equatorial climate, and in hydrogeology and water supply, particularly in the Sahel area. [less ▲]

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See detailExistence domains for nonlinear structures in complex two-ion-temperature plasmas
Hellberg, M. A.; Verheest, F.; Cattaert, Tom ULg

in Journal of Physics : A Mathematical & General (2006), 39(12), 3137-3146

The existence domains for one-dimensional acoustic solitons and double layers in complex (dusty) plasmas with two ion temperatures are obtained, using the fluid dynamic paradigm with a general polytropic ... [more ▼]

The existence domains for one-dimensional acoustic solitons and double layers in complex (dusty) plasmas with two ion temperatures are obtained, using the fluid dynamic paradigm with a general polytropic equation of state. Dust-acoustic solitons are considered in a four-component plasma of negative dust grains, cool and very hot ions, and very hot electrons. Whereas in a dust-ion-electron plasma only negative potential solitons are supported, the presence of a second ion component allows positive potential solitons to occur as well. The existence domain in parameter space is delineated, in particular, also for the reduced three-component case in which there are no free electrons, all electrons being adsorbed onto the dust grains. Next, the ion-acoustic regime is considered. Both positive and negative potential dust-ion acoustic solitons and double layers are found, and their existence conditions in the parameter space of cool ion density and Mach number derived. [less ▲]

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See detailL’existence effective comme prédicat de premier niveau : la contribution de Lotze
Dewalque, Arnaud ULg

Scientific conference (2008, April 11)

The aim of this talk is to provide a historical-critical reconstruction of the forgiven polemics, which opposed R. H. Lotze to Kant’s concept of “absolute positing” and to its variation by Herbart. With ... [more ▼]

The aim of this talk is to provide a historical-critical reconstruction of the forgiven polemics, which opposed R. H. Lotze to Kant’s concept of “absolute positing” and to its variation by Herbart. With regard to the metaphysical concept of “existence” as “actuality” (which must notably be distinguished from the logical analysis of “exists” as “objectivity”, viz. as second-level predicate), this reconstruction suggests that Lotze could be considered as the “missing link” between the Kantian and the Fregean paradigm: it allows us to understand the passage from existence as being “absolutely posited” to existence as being a “part” of the so-called “world-furniture”. [less ▲]

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See detailExistence et grandeur de la précession et de la nutation diurnes dans l’hypothèse d’une terre solide
Folie, François ULg

in Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique (1882), 3e série, t. 3(6), 16

In a previous note, the author establishes the possibility to check experimentally the existence of a fluid layer within the Earth's crust, with the help of the magnitude of the precession and diurnal ... [more ▼]

In a previous note, the author establishes the possibility to check experimentally the existence of a fluid layer within the Earth's crust, with the help of the magnitude of the precession and diurnal nutation. Repeating the latter calculations, the author manages to integrate completely the given differential equations that give. [less ▲]

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See detailExistence of a short period (3.5-4 hours) in the photometric variability of WR 66.
Rauw, Grégor ULg; Gosset, Eric ULg; Manfroid, Jean ULg et al

in Astronomy and Astrophysics (1996), 306

We report here on an independent detection of a short period (~4hours) in the photometric variations of WR66, thus confirming in broad terms the discovery by Antokhin et al.. In addition, we present the ... [more ▼]

We report here on an independent detection of a short period (~4hours) in the photometric variations of WR66, thus confirming in broad terms the discovery by Antokhin et al.. In addition, we present the first spectroscopic variability analysis for this star. A few peculiarities of the spectrum of WR66 are also discussed. Finally, we perform a brief examination of different possible origins of the phenomenon. [less ▲]

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See detailThe existence of an urban underclass in Belgium
Martiniello, Marco ULg

in New Community (1996), 22(4), 655-669

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See detailExistence of natural and conformally invariant quantizations of arbitrary symbols
Mathonet, Pierre ULg; Radoux, Fabian ULg

in Journal of Nonlinear Mathematical Physics (2010), 17

A quantization can be seen as a way to construct a differential operator with prescribed principal symbol. The map from the space of symbols to the space of differential operators is moreover required to be ... [more ▼]

A quantization can be seen as a way to construct a differential operator with prescribed principal symbol. The map from the space of symbols to the space of differential operators is moreover required to be a linear bijection. In general, there is no natural quantization procedure, that is, spaces of symbols and of differential operators are not equivalent, if the action of local diffeomorphisms is taken into account. However, considering manifolds endowed with additional structures, one can seek for quantizations that depend on this additional structure and that are natural if the dependence with respect to the structure is taken into account. The existence of such a quantization was proved recently in a series of papers in the context of projective geometry. Here, we show that the construction of the quantization based on Cartan connections can be adapted from projective to pseudo-conformal geometry to yield the natural and conformally invariant quantization for arbitrary symbols, outside some critical situations. [less ▲]

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See detailExistence, justice et violence. Sartre 1957-1973
Cormann, Grégory ULg

Conference (2011, March 12)

Le problème de la violence résume pour ainsi dire l’œuvre de Jean-Paul Sartre. Il circonscrit souvent, en tout cas, les critiques qu’on lui adresse et, de façon fondamentale, la manière même dont on la ... [more ▼]

Le problème de la violence résume pour ainsi dire l’œuvre de Jean-Paul Sartre. Il circonscrit souvent, en tout cas, les critiques qu’on lui adresse et, de façon fondamentale, la manière même dont on la lit. L’objet de cette communication sera de reprendre ce problème chez le dernier Sartre, de 1957 à 1973, c’est-à-dire de Questions de méthode à L’Idiot de la famille, à partir d’une analyse serrée de certaines interventions de Sartre sur le terrain politique ou plutôt juridico-politique. Je m’appuierai en particulier sur trois sources : l’intervention de Sartre au procès Ben Saddok (1957), sa préface aux Maos en France (1970) et sa conférence « Justice et État » (1973). Je souhaite mettre en évidence le travail d’élucidation politique que Sartre déploie à cette époque dans le cadre judiciaire, qu’il s’agisse de justice d’État ou de justice populaire. Chez Sartre, ce travail d’élucidation est inséparablement philosophique et littéraire. Il passe ainsi, d’une part, par un usage spécifique de la phénoménologie, dont Sartre a donné le programme dans son Esquisse d’une théorie des émotions, en une référence explicite à l’ontologie fondamentale de Heidegger ; il passe, d’autre part, par une reprise critique (philosophique et politique) de certaines références littéraires, en particulier de Malraux et de Camus dans le premier texte cité. L’Idiot de la famille propose la synthèse de cet effort : de faire de l’émotion une méthode (et non pas simplement d’explorer méthodiquement les émotions) et d’imprimer une torsion politique à la pratique littéraire (et non pas simplement d’y renoncer). À cette double condition, il peut être utile aujourd’hui de chercher, dans la philosophie de Sartre, certains moyens d’une heuristique de la violence et certains outils d’intelligibilité de ce qui, en dernière analyse, renvoie à la question de la liberté, autrement dit encore aux déterminations les plus fondamentales du partage entre puissance et impuissance. [less ▲]

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See detailL'existentialisme comme éthique, de Heidegger à Sartre
Caeymaex, Florence ULg

in Temps Modernes (Les) (2008), 650

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See detailExistenz, Körpertechniken und Gewalt bei Sartre. Skizzen zu einer politischen Anthropologie der Emotionen
Cormann, Grégory ULg; Viehöver, Vera ULg

in Feger, Hans; Hackel, Manuela (Eds.) Existenz-Philosophie und Ethik (2013)

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See detailL'exit tax française et le flou européen
Partsch, Philippe-Emmanuel ULg

in L'Echo (2004)

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See detailExit Taxes
Richelle, Isabelle ULg

Conference (2009, April)

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See detailExobiologie et complexité
Javaux, Emmanuelle ULg; Nazé, Yaël ULg

Article for general public (2005)

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See detailExobiology and Mars
Javaux, Emmanuelle ULg

Scientific conference (2005)

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See detailExocellular and membrane-bound transpeptidases in Streptomyces
Dusart, Jean; Marquet, A.; Ghuysen, Jean-Marie ULg

in 1st International Congress for Bacteriology, Jerusalem, 2-7 September, 1973. Abstracts. Vol. II. Free papers. (1973)

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See detailThe exocellular beta-lactamase of Streptomyces albus G.Purification, properties and comparison with the exocellular DD-carboxypeptidase
Duez, Colette ULg; Frère, Jean-Marie ULg; Klein, Daniel et al

in Biochemical Journal (1981), 193(1), 75-82

The exocellular beta-lactamase of Streptomyces albus G has been purified to near protein homogeneity. It consists of one single polypeptide chain of mol.wt. 30 000-31 000, has a rather low isoelectric ... [more ▼]

The exocellular beta-lactamase of Streptomyces albus G has been purified to near protein homogeneity. It consists of one single polypeptide chain of mol.wt. 30 000-31 000, has a rather low isoelectric point (at pH 6.0) and contains less lysine (2.1%) and more half-cystine residues than most beta-lactamases from other Gram-positive bacteria. Penicillins are much better substrates than delta 3-cephalosporins; the catalytic-centre activity of good penicillin substrates is 333-500 s-1. The exocellular, mol.wt. 17 000 DD-carboxypeptidase of S. albus G [previously purified to protein homogeneity; Duez, Frere, Geurts, Ghuysen, Dierickx & Delcambe (1978) Biochem. J. 175, 793-800] behaves as an exceedingly poor beta-lactamase, hydrolysing benzylpenicillin into benzylpenicilloate 5 x 10(-6)-fold less rapidly than does the exocellular beta-lactamase. To all appearances, the beta-lactamase has no bivalent cation requirement whereas, as shown elsewhere [Dideberg, Charlier, Dupont, Vermeire, Frere & Ghuysen (1980) FEBS Lett. 117, 212-214, and Dideberg, Joris, Frere, Ghuysen, Weber, Robaye, Delbrouck & Roelands (1980) FEBS Lett. 117, 215-218], the DD-carboxypeptidase possesses one essential Zn2+ ion per molecule. Peptide 'mapping' and immunological studies suggest that the two Streptomyces enzymes probably have very different structural and mechanistic properties. [less ▲]

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See detailThe exocellular DD-carboxypeptidase of Streptomyces albus G: A metallo (Zn2+) enzyme
Dideberg, O.; Joris, Bernard ULg; Frère, Jean-Marie ULg et al

in FEBS Letters (1980), 117(1-2), 215-218

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See detailThe exocellular DD-carboxypeptidase-endopeptidase from Streptomyces albus Gl. Purification and chemical properties
Duez, Colette ULg; Frère, Jean-Marie ULg; Geurts, Francine et al

in Biochemical Journal (1978), 175(3), 793-800

The exocellular DD-carboxypeptidase-endopeptidase of Streptomyces albus G was purified to protein homogeneity and compared with the exocellular DD-carboxypeptidases-transpeptidases of Streptomyces R61 and ... [more ▼]

The exocellular DD-carboxypeptidase-endopeptidase of Streptomyces albus G was purified to protein homogeneity and compared with the exocellular DD-carboxypeptidases-transpeptidases of Streptomyces R61 and Actinomadura R39. The S. albus G enzyme, as it is isolated, occurs in two forms. Enzyme I (30% of the total amount) and enzyme II (70% of the total amount) are identical in all respects, except that, by polyacrylamide-gel electrophoresis in the presence of sodium dodecyl sulphate, enzyme I has an apparent mol. wt. (9000) that is half of that found by molecular-sieve filtration under non-denaturing conditions. Irrespective of the technique used, enzyme II has an apparent mol. wt. of about 18500. [less ▲]

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See detailExocellular β-lactamases of Streptomyces albus G and strains R39 and K11
Johnson, Kenneth; Dusart, Jean; Campbell, James N. et al

in Antimicrobial Agents and Chemotherapy (1973), 3(2), 289-298

The beta-lactamases excreted by the highly benzylpenicillin-susceptible Streptomyces strain R39 and the highly benzylpenicillin-resistant Streptomyces albus G were isolated and purified. Neither beta ... [more ▼]

The beta-lactamases excreted by the highly benzylpenicillin-susceptible Streptomyces strain R39 and the highly benzylpenicillin-resistant Streptomyces albus G were isolated and purified. Neither beta-lactamase exhibited dd-carboxypeptidase activity. Both were anionic at pH 8.3, did not require metal ions, and were not sensitive to iodine, but were inhibited by Cu(2+) and readily inactivated by heat. p-Chloromercuribenzoate, iodoacetate, p-aminobenzoate, and substrates and inhibitors of dd-carboxypeptidase had no effect on beta-lactamase activity. The K(m) and V(max) values for beta-lactamase activity were studied with 6-aminopenicillanic acid and with various penicillins and cephalosporins. The beta-lactamase from the related strain K11 of Streptomyces, which is intermediate in its susceptibility to benzylpenicillin, was partially purified, and its activity was compared on the various substrates. [less ▲]

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