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Durand, Pascal ULg

in Durand, Pascal (Ed.) Les Nouveaux Mots du Pouvoir. Abécédaire critique (2007)

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See detailA comparison between FUV remote sensing of magnetotail stretching and the T01 model during quiet conditions and growth phases
Blockx, Caroline ULg; Gérard, Jean-Claude ULg; Coumans, Valérie ULg et al

in Annales Geophysicae [= ANGEO] (2007), 25(1), 161-170

In a previous study, Blockx et al. (2005) showed that the SI12 camera on board the IMAGE spacecraft is an excellent tool to remotely determine the position of the isotropy boundary (IB) in the ionosphere ... [more ▼]

In a previous study, Blockx et al. (2005) showed that the SI12 camera on board the IMAGE spacecraft is an excellent tool to remotely determine the position of the isotropy boundary (IB) in the ionosphere, and thus is able to provide a reasonable estimate of the amount of stretching of the magnetic field lines in the magetotail. By combining an empirical model of the magnetospheric configuration with Sergeev's criterion for non-adiabatic motion, it is also possible to obtain a theoretical position of IB in the ionosphere, for known conditions in the solar wind. Earlier studies have demonstrated the inadequacy of the Tsyganenko-1989 (T89) model to quantitatively reproduce the field line stretching, particularly during growth phases. In this study, we reexamine this question using the T01 model which considers the time history of the solar wind parameters. We compare the latitude of IB derived from SI12 global images near local midnight with that calculated from the T01 model and the Sergeev's criterion. Observational and theoretical results are found to frequently disagree. We use in situ measurements of the magnetic field with the GOES-8 satellite to discriminate which of the two components in the calculation of the theoretical position of the IB (the T01 model or Sergeev's criterion) induces the discrepancy. For very quiet magnetic conditions, we find that statistically the T01 model approximately predicts the correct location of the maximum proton precipitation. However, large discrepancies are observed in individual cases, as demonstrated by the large scatter of predicted latitudes. For larger values of the AE index, the model fails to predict the observed latitude of the maximum proton intensity, as a consequence of the lack of consideration of the cross-tail current component which produces a more elongated field configuration at the location of the proton injection along the field lines. We show that it is possible to match the observed location of the maximum proton precipitation by decreasing the current sheet half-thickness D parameter. We thus conclude that underestimation of the field line stretching leads to inadequately prediction of the boundary latitude of the non-adiabatic proton precipitation region. [less ▲]

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See detailLe retour de l’artiste maudit ? Le jury du Prix de la Jeune Peinture belge punit ses artistes
Bawin, Julie ULg

in Art Même : Chronique des Arts Plastiques de la Communauté française de Belgique (2007), (36), 22-23

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Durand, Pascal ULg

in Durand, Pascal (Ed.) Les Nouveaux Mots du Pouvoir. Abécédaire critique (2007)

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See detailLuc Tuymans : "le monde de l'art ne doit pas entrer dans mon atelier"
Bawin, Julie ULg

in Flux News (trimestriel d'art contemporain) (2007), (43), 11-12

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See detailImpressions du temps présent. L’exposition de Toma Muteba Luntumbue, Aimé Ntakiyica et Aimé Mpané
Bawin, Julie ULg

in Art Même : Chronique des Arts Plastiques de la Communauté française de Belgique (2007), (34), 38-39

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See detail(Im)Prévisions belges à la Biennale de Venise
Bawin, Julie ULg

in Art Même : Chronique des Arts Plastiques de la Communauté française de Belgique (2007), (35), 20

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See detailPolyphonies éditoriales au Musée royal de Mariemont
Bawin, Julie ULg

in Art Même : Chronique des Arts Plastiques de la Communauté française de Belgique (2007), (37), 42-43

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See detailPreserving and exhibiting contemporary art. Creation of a Research Unit at the University of Liège
Bawin, Julie ULg

in revue électronique "Ceroart" (conservation, exposition, restauration d'objets d'art) (2007)

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See detail« Je peins donc nous sommes ». L’humanité de l’art selon Pol Piérart, dans L’art même,
Bawin, Julie ULg

in Art Même : Chronique des Arts Plastiques de la Communauté française de Belgique (2007), (34), 31

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See detailLe foncier en pratique : la délimitation de Zones Villageoises d’Intérêt Cynégétique en périphérie du parc du W
Vermeulen, Cédric ULg; Lamon, A.; Kabore, B. et al

in VertigO : la Revue Electronique en Sciences de l'Environnement (2007)

Le Burkina Faso est le seul pays d’Afrique occidentale dont la législation autorise la gestion cynégétique de la faune par les populations locales. L’opportunité de construire une conservation de la faune ... [more ▼]

Le Burkina Faso est le seul pays d’Afrique occidentale dont la législation autorise la gestion cynégétique de la faune par les populations locales. L’opportunité de construire une conservation de la faune servant directement le développement local existe donc. Dans la pratique des choses, il reste cependant encore beaucoup d’étapes à franchir avant que des Zones Villageoises d’Intérêt Cynégétiques (ZOVIC) réellement autonomes et indépendantes financièrement ne prennent corps. La gestion cynégétique villageoise recouvre un ensemble d’enjeux variés et ouvre la porte à de nombreux questionnements : internes à la communauté d’abord, dans son rapport à l’espace et au foncier ; quant au fonctionnement des structures locales de gestion et leur fusion avec le système politique coutumier local ensuite, ainsi que de la réelle volonté de l’univers administratif et privé de la chasse à partager la rente avec les populations locales. [less ▲]

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See detailStudy of ventricular interaction during pulmonary embolism using clinical identification in a minimum cardiovascular system model.
Desaive, Thomas ULg; Ghuysen, Alexandre ULg; Lambermont, Bernard ULg et al

in Proceedings of the IEEE (2007)

Cardiovascular disturbances are difficult to diagnose and treat because of the large range of possible underlying dysfunctions combined with regulatory reflex mechanisms that can result in conflicting ... [more ▼]

Cardiovascular disturbances are difficult to diagnose and treat because of the large range of possible underlying dysfunctions combined with regulatory reflex mechanisms that can result in conflicting clinical data. Thus, medical professionals often rely on experience and intuition to optimize hemodynamics in the critically ill. This paper combines an existing minimal cardiovascular system model with an extended integral based parameter identification method to track the evolution of induced pulmonary embolism in porcine data. The model accounts for ventricular interaction dynamics and is shown to predict an increase in the right ventricle expansion index and a decrease in septum volume consistent with known physiological response to pulmonary embolism. The full range of hemodynamic responses was captured with mean prediction errors of 4.1% in the pressures and 3.1% in the volumes for 6 sets of clinical data. Pulmonary resistance increased significantly with the onset of embolism in all cases, as expected, with the percentage increase ranging from 89.98% to 261.44% of the initial state. These results are an important first step towards model-based cardiac diagnosis in the Intensive Care Unit. [less ▲]

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See detailComputer-aided analysis of rigid and flexible multibody systems
Verlinden, Olivier; Bruls, Olivier ULg; Conti, Calogero et al

Learning material (2007)

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See detailVaricella-zoster virus modulates NF-kappaB recruitment on selected cellular promoters.
El Mjiyad, Nadia ULg; Bontems, Sébastien ULg; Gloire, Geoffrey ULg et al

in Journal of Virology (2007), 81(23), 13092-104

Intercellular adhesion molecule 1 (ICAM-1) expression is down-regulated in the center of cutaneous varicella lesions despite the expression of proinflammatory cytokines such as gamma interferon and tumor ... [more ▼]

Intercellular adhesion molecule 1 (ICAM-1) expression is down-regulated in the center of cutaneous varicella lesions despite the expression of proinflammatory cytokines such as gamma interferon and tumor necrosis factor alpha (TNF-alpha). To study the molecular basis of this down-regulation, the ICAM-1 induction of TNF-alpha was analyzed in varicella-zoster virus (VZV)-infected melanoma cells (MeWo), leading to the following observations: (i) VZV inhibits the stimulation of icam-1 mRNA synthesis; (ii) despite VZV-induced nuclear translocation of p65, p52, and c-Rel, p50 does not translocate in response to TNF-alpha; (iii) the nuclear p65 present in VZV-infected cells is no longer associated with p50 and is unable to bind the proximal NF-kappaB site of the icam-1 promoter, despite an increased acetylation and accessibility of the promoter in response to TNF-alpha; and (iv) VZV induces the nuclear accumulation of the NF-kappaB inhibitor p100. VZV also inhibits icam-1 stimulation of TNF-alpha by strongly reducing NF-kappaB nuclear translocation in MRC5 fibroblasts. Taken together, these data show that VZV interferes with several aspects of the immune response by inhibiting NF-kappaB binding and the expression of target genes. Targeting NF-kappaB activation, which plays a central role in innate and adaptive immune responses, leads to obvious advantages for the virus, particularly in melanocytes, which are a site of viral replication in the skin. [less ▲]

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See detailLe campus virtuel de l'Université de Liège
Poumay, Marianne ULg

Learning material (2007)

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See detail« Sa Sainteté femelle » ou les réincarnations discrètes du mythe historiographique confessionnel de la papesse Jeanne au Refuge huguenot
Donneau, Olivier ULg

in Bulletin de la Société de l'Histoire du Protestantisme Français (1852) (2007), 153

Contrary to the usual affirmations, the myth of ‘Pope Joan’ was not destroyed by David Blondel (1647), but survived within the restricted circle of Huguenot intellectuals until the middle of the 18th ... [more ▼]

Contrary to the usual affirmations, the myth of ‘Pope Joan’ was not destroyed by David Blondel (1647), but survived within the restricted circle of Huguenot intellectuals until the middle of the 18th century. Faithful to his convictions, Pierre Bayle saw in this blindness a proof of partisan bias. The Huguenots of the Refuge rejected this idea, claiming that their aim was simply to avenge Protestant scholarship unjustly mocked by the Catholics on this subject. But the true aim of the rehabilitation of Pope Joan was quite different. The objective was to denounce the Papist spirit of deceit, at a moment when the memory and the identity of the Huguenots was cruelly threatened. [less ▲]

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See detailDe wereld volgens Ptolemaeus
Adam, Renaud ULg; Bracke, Wouter; Sorgeloos, Claude

in Bracke, Wouter; Danckaert, Lisette; De Candt, Caroline (Eds.) et al Formatting Europe : mapping a continent : tien eeuwen kaarten van Europa uit de collecties van de Koninklijke Bibliotheek van België (2007)

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See detail"Sens public" et actualité de Sartre : A propos de G. Wormser (dir.), Violence et Ethique & Du Mythe à l'Histoire
Cormann, Grégory ULg

in Année Sartrienne (L') : Bulletin du Groupe d'Etudes Sartriennes (2007), 21

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See detailThe source of fermentable carbohydrates influences the in vitro protein synthesis by colonic bacteria isolated from pigs
Bindelle, Jérôme ULg; Buldgen, André; Wavreille, José et al

in Animal (2007), 1(8), 1126-1133

Two in vitro experiments were carried out to quantify the incorporation of nitrogen (N) by pig colonic bacteria during the fermentation of dietary fibre, including non-starch polysaccharides and resistant ... [more ▼]

Two in vitro experiments were carried out to quantify the incorporation of nitrogen (N) by pig colonic bacteria during the fermentation of dietary fibre, including non-starch polysaccharides and resistant starch. In the first experiment, five purified carbohydrates were used: starch (S), cellulose (C), inulin (I), pectin (P) and xylan (X). In the second experiment, three pepsin–pancreatin hydrolysed ingredients were investigated: potato, sugar-beet pulp and wheat bran. The substrates were incubated in an inoculum, prepared from fresh faeces of sows and a buffer solution providing 15N-labelled NH4Cl. Gas production was monitored. Bacterial N incorporation (BNI) was estimated by measuring the incorporation of 15N in the solid residue at halftime to asymptotic gas production (T/2). The remaining substrate was analysed for sugar content. Short-chain fatty acids (SCFA) were determined in the liquid phase. In the first experiment, the fermentation kinetics differed between the substrates. P, S and I showed higher rates of degradation (P,0.001), while X and C showed a longer lag time and T/2. The sugar disappearance reached 0.91, 0.90, 0.81, 0.56 and 0.46, respectively, for P, I, S, C and X. Among them, S and I fixed more N per gram substrate (P,0.05) than C, X and P (22.9 and 23.2mg fixed N per gram fermented substrate v. 11.3, 12.3 and 9.8, respectively). Production of SCFA was the highest for the substrates with low N fixation: 562 and 565 mg/g fermented substrate for X and C v. 290 to 451 for P, I and S (P,0.01). In the second experiment, potato and sugar-beet pulp fermented more rapidly than wheat bran (P,0.001). Substrate disappearance at T/2 varied from 0.17 to 0.50. BNI were 18.3, 17.0 and 10.2 fixed N per gram fermented substrate, for sugar-beet pulp, potato and wheat bran, respectively, but were not statistically different. SCFA productions were the highest with wheat bran (913mg/g fermented substrate) followed by sugar-beet pulp (641) and potato (556) (P,0.05). The differences in N uptake by intestinal bacteria are linked to the partitioning of the substrate energy content between bacterial growth and SCFA production. This partitioning varies according to the rate of fermentation and the chemical composition of the substrate, as shown by the regression equation linking BNI to T/2 and SCFA (r250.91, P,0.01) and the correlation between BNI and insoluble dietary fibre (r520.77, P,0.05) when pectin was discarded from the database. [less ▲]

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See detailExploratory data analysis and clustering of multivariate spatial hydrogeological data by means of GEO3DSOM, a variant of Kohonen's Self-Organizing Map
Peeters, Luk; Bacao, R.; Lobo, V. et al

in Hydrology and Earth System Sciences (2007), 11(4), 1309-1321

The use of unsupervised artificial neural network techniques like the self-organizing map (SOM) algorithm has proven to be a useful tool in exploratory data analysis and clustering of multivariate data ... [more ▼]

The use of unsupervised artificial neural network techniques like the self-organizing map (SOM) algorithm has proven to be a useful tool in exploratory data analysis and clustering of multivariate data sets. In this study a variant of the SOM-algorithm is proposed, the GEO3DSOM, capable of explicitly incorporating three-dimensional spatial knowledge into the algorithm. The performance of the GEO3DSOM is compared to the performance of the standard SOM in analyzing an artificial data set and a hydrochemical data set. The hydrochemical data set consists of 131 groundwater samples collected in two detritic, phreatic, Cenozoic aquifers in Central Belgium. Both techniques succeed very well in providing more insight in the groundwater quality data set, visualizing the relationships between variables, highlighting the main differences between groups of samples and pointing out anomalous wells and well screens. The GEO3DSOM however has the advantage to provide an increased resolution while still maintaining a good generalization of the data set. [less ▲]

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