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 Publications ORBi OA     Results 27521-27540 of 46075.   1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382   NMDA-induced striatal brain damage and time-dependence reliability of thionin staining in ratsHaelewyn, B; Alix, Philippe ; Maubert, E et alin Journal of Neuroscience Methods (2008), 168Excitotoxic neuronal death induced by intracerebral injection of NMDA is a widely used model for investigating the potentially neuroprotective action of pharmacological agents against brain insults ... [more ▼]Excitotoxic neuronal death induced by intracerebral injection of NMDA is a widely used model for investigating the potentially neuroprotective action of pharmacological agents against brain insults involving excitotoxic processes. Surprisingly, the time-course of NMDA-induced brain damage yet has not been investigated in the rat. Answering this question clearly needs to be assessed, given that the validity of preclinical neuroprotection studies requires to be insured that brain damage has reached a plateau that corresponds to the maximal extension of neuronal death at the time the brain is removed for histological analysis. Here, we investigated the time-course of neuronal death and the time-dependence validity of thionin coloration in rats that were given an intrastriatal injection of NMDA of 50 nmol or 70 nmol. Our results show that, whatever the dose used, NMDA-induced brain damage reaches its maximal value 24-48 h after the insult. They further indicate that the volume values of brain damage as estimated by thionin coloration constitute reliable data when the brain is removed up to 48 h after injection of NMDA. However, if the brain is removed more than 48 h after the excitotoxic insult onset, there is no alternative of using other techniques, such as immunochemical or neuroimaging techniques. [less ▲]Detailed reference viewed: 13 (1 ULg) A decision problem for ultimately periodic sets in non-standard numeration systemsCharlier, Emilie ; Rigo, Michel in Actes des Journées Montoises d'Informatique Théorique (2008)Consider a non-standard numeration system like the one built over the Fibonacci sequence where nonnegative integers are represented by words over {0, 1} without two consecutive 1. Given a set X of ... [more ▼]Consider a non-standard numeration system like the one built over the Fibonacci sequence where nonnegative integers are represented by words over {0, 1} without two consecutive 1. Given a set X of integers such that the language of their greedy representations in this system is accepted by a finite automaton, we consider the problem of deciding whether or not X is a finite union of arithmetic progressions. We obtain a decision procedure under some hypothesis about the considered numeration system. In a second part, we obtain an analogous decision result for a particular class of abstract numeration systems built on an infinite regular language. [less ▲]Detailed reference viewed: 24 (2 ULg) Etalement urbain et services collectifs : les surcoûts d’infrastructures liés à l’eauHalleux, Jean-Marie ; Lambotte, Jean-Marc ; Bruck, L.in Revue d'Economie Régionale et Urbaine (2008), (1), 21-42L’article porte sur les relations entre les formes urbaines et la productivité des services collectifs. Il s’appuie sur la distinction entre les trois types de fourniture technique des infrastructures ... [more ▼]L’article porte sur les relations entre les formes urbaines et la productivité des services collectifs. Il s’appuie sur la distinction entre les trois types de fourniture technique des infrastructures, des superstructures et des dessertes par agent spécialisé. Les recherches développées pour le contexte wallon sur ce thème confirment la littérature quant à l’importance des surcoûts de l’étalement pour les services dont le fonctionnement est assuré par des infrastructures (notamment pour les domaines de la distribution de l’eau alimentaire et de l’assainissement). Il ressort également de l’analyse que ces surcoûts sont massivement collectivisés, via une taxation ou via une facturation qui ne considèrent nullement l’influence des modes de peuplement sur les besoins en investissements. [less ▲]Detailed reference viewed: 156 (43 ULg) Evolution of oxygen fugacity with crystallization in the Bjerkreim-Sokndal layered intrusionDuchesne, Jean-Clair ; Charlier, Bernard ; Vander Auwera, Jacqueline Poster (2008)Detailed reference viewed: 57 (14 ULg) Abstract numeration systems on bounded languages and multiplication by a constantCharlier, Emilie ; Rigo, Michel ; Steiner, Wolfgangin INTEGERS: Electronic Journal of Combinatorial Number Theory (2008), 8(1-A35), 1-19A set of integers is $S$-recognizable in an abstract numeration system $S$ if the language made up of the representations of its elements is accepted by a finite automaton. For abstract numeration systems ... [more ▼]A set of integers is $S$-recognizable in an abstract numeration system $S$ if the language made up of the representations of its elements is accepted by a finite automaton. For abstract numeration systems built over bounded languages with at least three letters, we show that multiplication by an integer $\lambda\ge2$ does not preserve $S$-recognizability, meaning that there always exists a $S$-recognizable set $X$ such that $\lambda X$ is not $S$-recognizable. The main tool is a bijection between the representation of an integer over a bounded language and its decomposition as a sum of binomial coefficients with certain properties, the so-called combinatorial numeration system. [less ▲]Detailed reference viewed: 43 (7 ULg) Panorama des principaux axes de la recherche sur le changement climatiqueGemenne, François in Critique Internationale (2008), 41Detailed reference viewed: 14 (1 ULg) Dynamics of a bouncing droplet onto a vertically vibrated interfaceGilet, Tristan ; Terwagne, Denis ; Vandewalle, Nicolas et alin Physical Review Letters (2008), 100(16), Low viscosity (< 100 cSt) silicon oil droplets are placed on a high viscosity (1000 cSt) oil bath that vibrates vertically. The viscosity difference ensures that the droplet is more deformed than the bath ... [more ▼]Low viscosity (< 100 cSt) silicon oil droplets are placed on a high viscosity (1000 cSt) oil bath that vibrates vertically. The viscosity difference ensures that the droplet is more deformed than the bath interface. Droplets bounce periodically on the bath when the acceleration of its sinusoidal motion is larger than a threshold value. The threshold is minimum for a particular frequency of excitation: droplet and bath motions are in resonance. The bouncing droplet has been modeled by considering the deformation of the droplet and the lubrication force exerted by the air layer between the droplet and the bath. Threshold values are predicted and found to be in good agreement with our measurements. [less ▲]Detailed reference viewed: 71 (16 ULg) Upper and uppermost Famennian miospore and conodont correlation in the Ardenne-Rhenisch areaStreel, Maurice in Subcommission on Devonian Stratigraphy Newsletter (2008), 23Detailed reference viewed: 10 (3 ULg) Late Devonian and Early Carboniferous glacial records of South AmericaCaputo, M.V.; Melo, J.H.; Streel, Maurice et alin Special Papers (Geological Society of America) (2008), 441Detailed reference viewed: 76 (4 ULg) "SketSha" or the sketch power to support collaborative design.Elsen, Catherine ; Leclercq, Pierre in Lecture Notes in Computer Science (2008), 5220This paper presents a new supporting tool for distant collaborative design, named SketSha. This prototype supports the early stages of design and more particularly the initial and crucial step of free ... [more ▼]This paper presents a new supporting tool for distant collaborative design, named SketSha. This prototype supports the early stages of design and more particularly the initial and crucial step of free-hand sketching. SketSha and its particular interface, named the virtual desktop, aim to keep from Front-To-Front collaborative work all the benefits and to appoint to them some of the nowadays IT facilities, in order to manage in a realistic and efficient way a long distance collaboration and to effectively serve the designers’ needs. Our hope is to re-introduce the social aspects and group interactions, crucial for real system efficacy and adaptation to the business world. The paper presents the fundamental assumptions made to implement SketSha, that are questioned and analyzed through a real-size experimentation featuring 30 architecture and building engineering students, working together in real-time in different locations (Belgium and France). This experiment and the necessary survey open up interesting fields of investigations, such as the relevance of the sketch stage and the proposed device to support distant collaborative design in architecture and the benefit it represents for students, in a pedagogical point of view, to merge the IT aspects and the design studio. The methodology and the replicability are analyzed to increase the level and quality of our students’ formation and, finally, a critic of SketSha constitutes a benefit for the developing teams. [less ▲]Detailed reference viewed: 145 (31 ULg) From strokes to model: a bottom-up approach for sketching activities analysis. Workshop.Safin, Stéphane ; Juchmes, Roland ; Elsen, Catherine et alConference (2008)This paper proposes a framework for sketches analysis that could be useful for sketch-based interfaces development, in the particular context of preliminary activity-centred design. We will first describe ... [more ▼]This paper proposes a framework for sketches analysis that could be useful for sketch-based interfaces development, in the particular context of preliminary activity-centred design. We will first describe our previous works on sketch-based support tools for the preliminary design phases and the context of these researches. The next chapter declares the concrete objectives of our approach, then the methodology of sketches analysis we propose is presented with a concrete example, and finally the last section is dedicated to the expected results and specifications of a sketch-based support tool that would follow our framework. [less ▲]Detailed reference viewed: 248 (23 ULg) Conception architecturale collaborative avec un bureau augmenté : une étude exploratoire de l'effet de la distance et de la co-localisationBurkhardt, Jean-Marie; Détienne, Françoise; Moutsingua-Mpaga, Linda et alin Negroni, Ph; Haradji, Y. (Eds.) Ergonomie et Conception, Actes du 43e Congrès de la SELF (2008)Detailed reference viewed: 154 (9 ULg) Du crayon au stylo numérique : influences des interprétations numériques sur l'activité graphique en tâches de conception.Safin, Stéphane ; Juchmes, Roland ; Leclercq, Pierre in IHM 2008: Proceedings of the 20th international conference on Francophone sur l'Interaction Homme-Machine (2008)Notre recherche s'inscrit dans le cadre du développement de logiciels basés sur le dessin à main levée dans le domaine de l'architecture. Dans cet article, nous étudions l’activité de "mise au net" de ... [more ▼]Notre recherche s'inscrit dans le cadre du développement de logiciels basés sur le dessin à main levée dans le domaine de l'architecture. Dans cet article, nous étudions l’activité de "mise au net" de dessins lors de la phase d'esquisse préliminaire et cherchons à identifier des modifications de cette activité in-duites par un environnement logiciel. Nous observons quatre activités de conception, deux sur papier-crayon et deux sur environnement numérique et déduisons des conclusions opérationnelles pour le dé-veloppement de logiciels destinés à supporter le croquis d'architecture. [less ▲]Detailed reference viewed: 121 (11 ULg) Le régionalisme sud-américain, l'Union européenne et les Etats-UnisSantander, Sébastian Book published by éditions de l’Université de Bruxelles (2008)L’ouvrage a pour objet central l’analyse des intégrations régionales dans la politique mondiale post-bipolaire. Une importante partie des travaux consacrés à l'explication du régionalisme partent d'une ... [more ▼]L’ouvrage a pour objet central l’analyse des intégrations régionales dans la politique mondiale post-bipolaire. Une importante partie des travaux consacrés à l'explication du régionalisme partent d'une approche essentiellement endogène accordant une attention distraite aux déterminants exogènes. Pour comprendre la nature du nouveau régionalisme, il faut le situer dans une perspective globale qui tient compte de l’interrelation entre les niveaux national, régional et global. Bien que le régionalisme renvoie à des logiques internes propres, le phénomène est fortement conditionné et façonné par l’extérieur du fait qu’il évolue en interaction directe et constante avec le monde économique et politique international, et qu’il fait l’objet de politiques menées par des acteurs dominants de l’arène mondiale. Les déterminants extérieurs sont donc essentiels pour comprendre l’évolution du régionalisme. Pour étayer cette hypothèse, l’ouvrage se concentre sur l’étude du régionalisme latino-américain et plus précisément sur le Marché commun du Sud (MERCOSUR) qui fait l’objet de stratégie différente de la part de l’Union européenne et des Etats-Unis. [less ▲]Detailed reference viewed: 392 (34 ULg) Radiative and Auger decay data for modeling nickel K linesPalmeri, P; Quinet, Pascal ; Mendoza, C et alin Astrophysical Journal Supplement Series (2008), 179Detailed reference viewed: 1 (0 ULg) The spectra of massive stars with GAIABouret, J C; Lanz, T; Frémat, Y et alin Revista Mexicana de Astronomía y Astrofísica (2008), 33Detailed reference viewed: 10 (0 ULg) Radiative and Auger decay of K-vacancy levels in the Ne, Mg, Si, S, Ar and Ca isonuclear sequencesPalmeri, P; Quinet, Pascal ; Mendoza, C et alin Astrophysical Journal Supplement Series (2008), 177Detailed reference viewed: 3 (0 ULg) The miospores of the Westphalian C / Westphalian D transition in the Campine Basin (Belgium) in the context of the macroflora zonations.Streel, Maurice ; Somers, Y; Dusar, Min Geologica Belgica (2008), 11(3-4), 243-250Detailed reference viewed: 16 (2 ULg) Analysis of the Yuntaishan Geology by Laser-induced Breakdown SpectroscopyLiu, Linmei; Lin, Zhaoxiang; Li, Jie et alin Applied Laser (2008), 28(5), 386389The plasma was generated by focusing a pulsed Nd：YAG laser at 1064nm on the surface of sample and detected by an echelle spectrograph and an intensified charge coupled device(ICCD)．The qualitative ... [more ▼]The plasma was generated by focusing a pulsed Nd：YAG laser at 1064nm on the surface of sample and detected by an echelle spectrograph and an intensified charge coupled device(ICCD)．The qualitative analysis of the spring rock and soil were performed using laser induced breakdown spectroscopy(LIBS)．The Ca and Mg elements were found to be in spring comparing the spectra of spring and purified water．Measured the spectra of Zhuyufeng rock and Tanpuxia rock indicated a significant difference between the concentrations of tWO rocks．There were more compositions in Tanpuxia rock than that of Zhuyufeng rock．Furthermore，the experiments of Zhuyufeng soil and the soil near the Southern Central University for Nationalities (SCUEC)were carried on．The result demonstrated that Ni element that is needfull tO plant was included in Zhuymcng soil， and Zn、Cu and Hg were found in the soil near SCUEC. [less ▲]Detailed reference viewed: 26 (0 ULg) Diffuse large B-cell lymphoma (DLBCL) of the waldeyer'ring (WR) frequently have a GC-like phenotype: a clinico-pathological study of 209 patients from the groupe d'étude des lymphomes de l'adulte (GELA).de Leval, Laurence; Bonnet, Christophe ; Brière, J. et alin Annals of Oncology (2008), 13(suppl 4)Detailed reference viewed: 15 (0 ULg)