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See detailAuroral current systems in Saturn's magnetosphere: comparison of theoretical models with Cassini and HST observations
Cowley, S. W. H.; Arridge, C. S.; Bunce, E. J. et al

in Annales Geophysicae [= ANGEO] (2008), 26(9), 2613-2630

The first simultaneous observations of fields and plasmas in Saturn's high-latitude magnetosphere and UV images of the conjugate auroral oval were obtained by the Cassini spacecraft and the Hubble Space ... [more ▼]

The first simultaneous observations of fields and plasmas in Saturn's high-latitude magnetosphere and UV images of the conjugate auroral oval were obtained by the Cassini spacecraft and the Hubble Space Telescope (HST) in January 2007. These data have shown that the southern auroral oval near noon maps to the dayside cusp boundary between open and closed field lines, associated with a major layer of upward-directed field-aligned current (Bunce et al., 2008). The results thus support earlier theoretical discussion and quantitative modelling of magnetosphere-ionosphere coupling at Saturn (Cowley et al., 2004), that suggests the oval is produced by electron acceleration in the field-aligned current layer required by rotational flow shear between strongly sub-corotating flow on open field lines and near-corotating flow on closed field lines. Here we quantitatively compare these modelling results (the 'CBO' model) with the Cassini-HST data set. The comparison shows good qualitative agreement between model and data, the principal difference being that the model currents are too small by factors of about five, as determined from the magnetic perturbations observed by Cassini. This is suggested to be principally indicative of a more highly conducting summer southern ionosphere than was assumed in the CBO model. A revised model is therefore proposed in which the height-integrated ionospheric Pedersen conductivity is increased by a factor of four from 1 to 4 mho, together with more minor adjustments to the co-latitude of the boundary, the flow shear across it, the width of the current layer, and the properties of the source electrons. It is shown that the revised model agrees well with the combined Cassini-HST data, requiring downward acceleration of outer magnetosphere electrons through a similar to 10 kV potential in the current layer at the open-closed field line boundary to produce an auroral oval of similar to 1 degrees width with UV emission intensities of a few tens of kR. [less ▲]

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See detailProduire une exposition sous forte contrainte
Jaminon, Martine ULg

Conference (2008)

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See detailSelf-Adapting Parameters in Simulation of Management Systems
Dubois, Daniel ULg; Holmberg, Stig

in Trappl, Robert (Ed.) CYBERNETICS AND SYSTEMS 2008 (2008)

This paper deals with a new version of a web-based software simulation tool MLD-STAR (Management Learning and Decision making – Simulation Tool with Anticipation and Retardation), for the numerical ... [more ▼]

This paper deals with a new version of a web-based software simulation tool MLD-STAR (Management Learning and Decision making – Simulation Tool with Anticipation and Retardation), for the numerical simulation of mathematical models of management systems. A new algorithm is presented to automatically compute the numerical values of the parameters of models to be simulated. The main idea consists in generating successive sets of values of the parameters of the model with a random number generator, and to use a selection criterion for accepting or rejecting the sets of values. This self-adapting parameters method is so based on a Darwinian process of selection. Results of simulations with such self-adapting parameters are given in using the mathematical model given in Dubois and Holmberg (2006). [less ▲]

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See detailDistributed Collaborative Design Studio : a sketch-based environment to support rich distant collaboration. Workshop.
Safin, Stéphane ULg; Delfosse, Vincent ULg; Elsen, Catherine ULg et al

Conference (2008)

An increasing number of large scale projects requires that distant teams collaborate together remotely. At the same time, the current CAD tools only offer minimal support for partial and asynchronous ... [more ▼]

An increasing number of large scale projects requires that distant teams collaborate together remotely. At the same time, the current CAD tools only offer minimal support for partial and asynchronous interactions. The application we propose enables full synchronous and remote sketch-based collaborative design. This setup is a combination of a virtual desktop (a remote meeting table), a standard videoconference system, a gesture recognition module and a networked, real-time, collaborative drawing software (SketSha). The solution as a whole is multimodal in essence (gestures, speech, drawing…) supporting immersive remote collaborative design. [less ▲]

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See detailSecondary amenorrhea and cerebral ventriculomegaly
Habay, Nathalie ULg; Foidart, Jean-Michel ULg; Legros, Jean-Jacques ULg et al

in Revue Médicale de Liège (2008), 63(11), 662-5

Cerebral ventriculomegaly and hydrocephalus are not frequently associated with endocrine disorders of the gonadotropic axis. The mechanism of this association is not clarified. The most probable cause is ... [more ▼]

Cerebral ventriculomegaly and hydrocephalus are not frequently associated with endocrine disorders of the gonadotropic axis. The mechanism of this association is not clarified. The most probable cause is however a partial hypothalamic dysfunction. The examination of the few reported cases is in favour of this explanation. We present the case of a young woman with a cerebral ventriculomegaly and suffering from secondary amenorrhea. Shunt was not necessary from the neurological point of view, the problem of secondary amenorrhea and anovulatory infertility was solved by clomiphen citrate therapy. [less ▲]

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See detailAn experimental and numerical investigation on the influence of external gas recirculation on the HCCI autoignition process in an engine: Thermal, diluting, and chemical effects
Machrafi, Hatim ULg; Cavadias, Simeon; Guibert, Philippe

in Combustion & Flame (2008), 155(3), 476-489

In order to contribute to the solution of controlling the autoignition in a homogeneous charge compression ignition (HCCI) engine, parameters linked to external gas recirculation (EGR) seem to be of ... [more ▼]

In order to contribute to the solution of controlling the autoignition in a homogeneous charge compression ignition (HCCI) engine, parameters linked to external gas recirculation (EGR) seem to be of particular interest. Experiments performed with EGR present some difficulties in interpreting results using only the diluting and thermal aspect of EGR. Lately, the chemical aspect of EGR is taken more into consideration, because this aspect causes a complex interaction with the dilution and thermal aspects of EGR. This paper studies the influence of EGR on the autoignition process and particularly the chemical aspect of EGR. The diluents present in EGR are stimulated by N-2 and CO2, with dilution factors going from 0 to 46 vol%. For the chemically active species that could be present in EGR, the species 0 and 170 ppm, while that of CH2O alters between 0 and 1400 ppm. For the investigation of the effect of the chemical species on the autoignition, a fixed dilution factor of 23 vol% and a fixed EGR temperature of 70 degrees C are maintained. The inlet temperature is held at 70 degrees C, the equivalence ratios between 0.29 and 0.41, and the compression ratio at 10.2. The fuels used for the autoignition are n-heptane and PRF40. It appeared that CO, in the investigated domain, did not influence the ignition delays, while NO had two different effects. At concentrations up until 45 ppm, NO advanced that ignition delays for the PRF40 and at higher concentrations, the ignition delayed. The influence of NO on the autoignition of n-heptane seemed to be insignificant, probably due to the higher burn rate of n-heptane. CH2O seemed to delay the ignition. The results suggested that especially the formation of OH radicals or their consumption by the chemical additives determines how the reactivity of the autoignition changed. (C) 2008 The Combustion Institute. Published by Elsevier Inc. All rights reserved. [less ▲]

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See detailEpidemiology of injuries in high-level youth sport in Luxembourg [Abstract]
Frisch, Anne ULg; Theisen, Daniel; Urhausen, Axel et al

in Knee Surgery, Sports Traumatology, Arthroscopy (2008), 16

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See detailDu neuf au sujet de la condamnation d'office visée par l'article 35, paragraphe 1er, aliéna 3 de la loi du 27 juin 1969 concernant la sécurité sociale des travailleurs salariés
Michiels, Olivier ULg

in Revue de la Faculté de Droit de l'Université de Liège (2008), 1

La note porte sur la nature juridique des condamnations d'office portées par la loi du 27 juin 1969 concernant la sécurité sociale des travailleurs salariés.

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See detailLe projet DACEFI : contexte, philosophie et résultats attendus
Federspiel, M.; Vermeulen, Cédric ULg; Carr, B. et al

in Vermeulen, Cédric; Doucet, Jean-Louis (Eds.) Les premières forêts communautaires du Gabon : Récits d'une expérience pilote (2008)

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See detailRentabilité des cultures céréalières en Région wallonne durant la période 2004-2006 et perspectives
Delille, Nicolas ULg; Gheysen, Marjorie; Vanorlé, L. et al

(2008)

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See detailLes gestionnaires interpellés
Vermeulen, Cédric ULg

in Roulet; Assenmaker (Eds.) Gouvernance et environnement en afrique centrale : le modèle participatif en question (2008)

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See detailEsquisse d’une profession consultante. Les intermédiaires du marché du travail en Wallonie
Orianne, Jean-François ULg; Maroy, Christian

in Formation Emploi : Revue Française de Sciences Sociales (2008), 102

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See detailPerception of pain in the minimally conscious state with PET activation: an observational study.
Boly, Mélanie ULg; Faymonville, Marie-Elisabeth ULg; Schnakers, Caroline et al

in Lancet Neurology (2008), 7(11), 1013-20

BACKGROUND: Patients in a minimally conscious state (MCS) show restricted self or environment awareness but are unable to communicate consistently and reliably. Therefore, better understanding of cerebral ... [more ▼]

BACKGROUND: Patients in a minimally conscious state (MCS) show restricted self or environment awareness but are unable to communicate consistently and reliably. Therefore, better understanding of cerebral noxious processing in these patients is of clinical, therapeutic, and ethical relevance. METHODS: We studied brain activation induced by bilateral electrical stimulation of the median nerve in five patients in MCS (aged 18-74 years) compared with 15 controls (19-64 years) and 15 patients (19-75 years) in a persistent vegetative state (PVS) with (15)O-radiolabelled water PET. By way of psychophysiological interaction analysis, we also investigated the functional connectivity of the primary somatosensory cortex (S1) in patients and controls. Patients in MCS were scanned 57 (SD 33) days after admission, and patients in PVS 36 (9) days after admission. Stimulation intensities were 8.6 (SD 6.7) mA in patients in MCS, 7.4 (5.9) mA in controls, and 14.2 (8.7) mA in patients in PVS. Significant results were thresholded at p values of less than 0.05 and corrected for multiple comparisons. FINDINGS: In patients in MCS and in controls, noxious stimulation activated the thalamus, S1, and the secondary somatosensory or insular, frontoparietal, and anterior cingulate cortices (known as the pain matrix). No area was less activated in the patients in MCS than in the controls. All areas of the cortical pain matrix showed greater activation in patients in MCS than in those in PVS. Finally, in contrast with patients in PVS, those in MCS had preserved functional connectivity between S1 and a widespread cortical network that includes the frontoparietal associative cortices. INTERPRETATION: Cerebral correlates of pain processing are found in a similar network in controls and patients in MCS but are much more widespread than in patients in PVS. These findings might be objective evidence of a potential pain perception capacity in patients in MCS, which supports the idea that these patients need analgesic treatment. [less ▲]

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See detailLe commerce équitable : leçons d’expériences
Duquesne, Brigitte ULg; Lebailly, Philippe ULg

Conference (2008)

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See detailOncogene-induced senescence relayed by an interleukin-dependent inflammatory network.
Kuilman, Thomas; Michaloglou, Chrysiis; Vredeveld, Liesbeth C. W. et al

in Cell (2008), 133(6), 1019-1031

Oncogene-induced cellular senescence (OIS) is emerging as a potent cancer-protective response to oncogenic events, serving to eliminate early neoplastic cells from the proliferative pool. Using combined ... [more ▼]

Oncogene-induced cellular senescence (OIS) is emerging as a potent cancer-protective response to oncogenic events, serving to eliminate early neoplastic cells from the proliferative pool. Using combined genetic and bioinformatic analysis, we find that OIS is linked specifically to the activation of an inflammatory transcriptome. Induced genes included the pleiotropic cytokine interleukin-6 (IL-6), which upon secretion by senescent cells acted mitogenically in a paracrine fashion. Unexpectedly, IL-6 was also required for the execution of OIS, but in a cell-autonomous mode. Its depletion caused the inflammatory network to collapse and abolished senescence entry and maintenance. Furthermore, we demonstrate that the transcription factor C/EBPbeta cooperates with IL-6 to amplify the activation of the inflammatory network, including IL-8. In human colon adenomas, IL-8 specifically colocalized with arrested, p16(INK4A)-positive epithelium. We propose a model in which the context-dependent cytostatic and promitogenic functions of specific interleukins contribute to connect senescence with an inflammatory phenotype and cancer. [less ▲]

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