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See detailObservation of dayside subauroral proton flashes with the IMAGE-FUV imagers
Hubert, Benoît ULg; Gérard, Jean-Claude ULg; Fuselier, S. A. et al

in Geophysical Research Letters (2003), 30

A detailed description of an intense flash of auroral emissions that occurs equatorward of the dayside auroral oval observed with the IMAGE-FUV imagers is presented. The comparison of simultaneous ... [more ▼]

A detailed description of an intense flash of auroral emissions that occurs equatorward of the dayside auroral oval observed with the IMAGE-FUV imagers is presented. The comparison of simultaneous snapshots of this subauroral flash obtained with the three FUV cameras indicates that proton precipitation is dominant. This transient proton aurora is triggered by the sudden increase of a solar wind dynamic pressure pulse. It occurs on closed field lines mapping to the equatorial plane at distances as small as ~4 R[SUB]E[/SUB]. A second similar event is presented, and several other cases are mentioned. These shock induced transcient emissions develop with a time scale of a few minutes (typically ~5 min), and have a relaxation time on the order of ~10 minutes. [less ▲]

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See detailObservation of incretin effects during enteral feed transitions of critically ill patients
Jamaludin, U. K.; Docherty, P. D.; Geoffrey Chase, J. et al

in e-SPEN Journal (2012), 7(4), 154-159

Background & aims: Critically ill patients are regularly feed via constant enteral (EN) nutrition infusions. However, the incretin effect or its impact on endogenous insulin concentration remains unclear ... [more ▼]

Background & aims: Critically ill patients are regularly feed via constant enteral (EN) nutrition infusions. However, the incretin effect or its impact on endogenous insulin concentration remains unclear. This study determines whether there is an EN-driven incretin effect in critically ill patients requiring glycaemic control. Methods: Clinically validated, model-based time-variant insulin sensitivity (S I) profiles were identified for 52 non-diabetic patients on Specialized Relative Insulin Nutrition Titration (SPRINT) glycaemic control during transitions off EN (ON/OFF), and back on to EN (OFF/ON). Incretin effects were observable via increased modelled S I after the OFF/ON transition or a decreased S I after the ON/OFF transition. Results: Patients exhibited a median -36% (IQR -82% to 24% p = 0.001) reduction after the ON/OFF feed transition, and a median of +32% (IQR -5% to 53%, p = 0.05) rise in measured S I after the OFF/ON transition. However, 32% of patients exhibited increased S I at the OFF/ON transition, and 37% exhibited reduced S I at the ON/OFF transition. The results are likely due to changes in patient condition over the 5-8 h considered outweighing this effect. Blood glucose was the same during both transitions with median shifts of -2% and -3% after the ON/OFF, and OFF/ON transitions (p > 0.5), respectively. Conclusions: Results imply a significant incretin effect is observed at a cohort level. The impact was stronger for the OFF/ON transition indicating that this effect may be blunted by long-term continuous EN infusions. These results provide the data to design conclusive studies, and to inform glycaemic control protocol development and implementation. © 2012 European Society for Clinical Nutrition and Metabolism. [less ▲]

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See detailThe observation of Predissociations in the Oxygen Molecular Ion by low-energy electron impact.
Locht, Robert ULg; Schopman, Joop

in Chemical Physics Letters (1974), 26(4), 596-600

The kinetic energy distribution of the O+ ions formed by dissociative ionization of O2 has been carefully examined in the range of 0.0 to 1.3 eV. In the peak at 600 meV fine structure is observed and ... [more ▼]

The kinetic energy distribution of the O+ ions formed by dissociative ionization of O2 has been carefully examined in the range of 0.0 to 1.3 eV. In the peak at 600 meV fine structure is observed and interpreted by predissociation. The high energy side of the peak has been ascribed to the predissociation of the 2Deltag, B2Sigma-/g and the C4Sigma-/u states of O2+. The low energy side of the peak is presumably due to the predissociation of the b4Sigma-/g or the 2Phiu state of O2+ or to autoionizing predissociation. [less ▲]

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See detailObservation of short and long timescale variability of the jovian UV aurora
Grodent, Denis ULg; Gérard, Jean-Claude ULg; Dols, V. et al

in Bulletin of the American Astronomical Society (1998, September 01)

Three sets of Hubble Space Telescope far-ultraviolet images of Jupiter's North pole aurora have been obtained with the Wide Field and Planetary Camera 2 in June 1996, May 1997 and August 1997. The ... [more ▼]

Three sets of Hubble Space Telescope far-ultraviolet images of Jupiter's North pole aurora have been obtained with the Wide Field and Planetary Camera 2 in June 1996, May 1997 and August 1997. The exposure time was limited to 160 seconds in order to reveal short timescale auroral features that are normally averaged during longer exposures and blurred by the rapid jovian rotation. The 3 sets of images show the aurora in a comparable (quiet) activity level, exhibiting long term persistent features such as : (i) a stable thin morning arc, (ii) a morning-afternoon emission dichotomy, (iii) a minimum of low latitude emission around CML=175 deg, (iv) bright localized afternoon structures. The equatorward boundary of the arc closely follows but is not coincident with the footprint of the 20 RJ magnetic field line given by the VIP4 model. These stable structures contrast with rapidly changing features like small size spots blasting in one single image, bright regions connecting trans-auroral structures, and the inner diffuse emission. The question of temporal variability and spatial extent of the auroral features is of major importance in understanding the origin and acceleration mechanisms of the auroral particles exciting the jovian UV aurora. In particular, short timescale processes can be related to field aligned currents generating acceleration structures and discrete aurora. [less ▲]

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See detailObservation of the failure mechanism of brick masonry doublets with cement and lime mortars by microfocus X-ray computed tomography
Hendrickx, Roel; Bruyninckx, Katrien; Schueremans, Luc et al

in Jäger, W., Hasseltine, B., Fried, A. (Eds.), 8th International Masonry Conference 2010 (2010)

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See detailObservation of the failure mechanism of brick masonry doublets with cement and lime mortars by X-ray CT
Hendrickx, Roel; Bruyninckx, K.; Schueremans, L. et al

Scientific conference (2009)

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See detailObservation of the Incretin Effect in Critically Ill patients
Jamaludin, U.; Docherty, P; Chase, JG et al

in Proceedings of the 11th Annual Diabetes Technology Meeting (DTM2011) (2011)

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See detailObservation of the proton aurora with IMAGE FUV imager and simultaneous ion flux in situ measurements
Gérard, Jean-Claude ULg; Hubert, Benoît ULg; Meurant, M. et al

in Journal of Geophysical Research. Space Physics (2001), 106(A12), 28939-28948

The far ultraviolet cameras on board the IMAGE satellite images the aurora in three different spectral regions. One of the channels of the spectrographic imager SI12 observes the Doppler-shifted Lyman ... [more ▼]

The far ultraviolet cameras on board the IMAGE satellite images the aurora in three different spectral regions. One of the channels of the spectrographic imager SI12 observes the Doppler-shifted Lyman alpha emission of precipitating protons. It makes it possible to spectrally discriminate between the proton and electron FUV aurora and to globally map the energetic protons. Its response depends on the auroral Lyman alpha. line shape which reflects the characteristics of the proton pitch angle and energy distributions. We illustrate the dependence of the SI12 count rate on the characteristic energy of the proton precipitation and the viewing geometry. Simultaneous in situ observations of the precipitated protons have been collected during a FAST satellite pass when IMAGE was observing the global north polar region. The premidnight region located at the equatorward boundary of the oval is dominated by proton precipitation with a mean energy E = 7 keV which is separated from the electron component. The prenoon crossing exhibits a softer proton energy spectrum with E = 0.9 keV. The measured proton energy distribution is used as an input to a Monte Carlo model to calculate the expected SI12 signal along the magnetic footprint of the satellite orbit. If the different spatial resolution of the two types of measurements is accounted for, a good quantitative agreement is found with the IMAGE observations. Similarly, ion flux measurements collected on board the Defense Meteorological Satellite Program F15 satellite during an overflight in the postmidnight sector provide good agreement with the SI12 observations at the footprint aurora. The comparisons confirm the reliability of the FUV IMAGE cameras to remotely discriminate between the electron and the proton precipitations. The vertical emission rate profiles of the N-2 Lyman-Birge-Hopfield and O I (1356 Angstrom) emissions are calculated in the proton-dominated premidnight region. It is shown that the protons and the electrons produce FUV emissions with contributions peaking at different altitudes. Excitation by secondary electrons dominates the production of both emissions. [less ▲]

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See detailObservation of wall effects in activated carbon filters by x-ray µCT
Léonard, Angélique ULg; Wullens, Hilda; Blacher, Silvia ULg et al

in Mc Cann, H.; Johansen, G. A. (Eds.) Proceedings of the 5th World Congress on Industrial Process Tomography, Bergen, Norway, September 6-9, 2007 (2007, September)

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See detailObservation photométriques par fusées-sondes. Sélection des visées horizontales.
Gérard, Jean-Claude ULg

in ELDO/ESRO Scientific and Technical Review (1972)

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See detailL'observation réfléchie de la langue au premier degré de l'enseignement secondaire
Dumortier, Jean-Louis ULg

in Enjeux : Revue de Formation Continuée et de Didactique du Français (2006), 65

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See detailL'Observation Réfléchie de la Langue
Lucchini, Silvia ULg; Thyrion, Francine

Scientific conference (2008, January)

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See detail« Observation relative au poème Un Coup de Dés jamais n’abolira le Hasard par Stéphane Mallarmé » : une préface d’un nouveau genre ?
Durand, Pascal ULg

in Björn-Olav, Dozo; Saint-Amand, Denis (Eds.) Jeux et enjeux de la préface (in press)

L’« Observation relative au poème UN COUP DE DÉS JAMAIS N’ABOLIRA LE HASARD », rédigée expressément à la demande de la rédaction de la revue Cosmopolis qui en avait procuré l’édition originale sous une ... [more ▼]

L’« Observation relative au poème UN COUP DE DÉS JAMAIS N’ABOLIRA LE HASARD », rédigée expressément à la demande de la rédaction de la revue Cosmopolis qui en avait procuré l’édition originale sous une première forme, est depuis lors, assez improprement, considérée et lue comme une « préface » au Coup de dés dans sa version définitive. Émanant d’un poète ayant marqué plus d’une fois la vive défiance que lui inspirait le geste de la préface, elle doit plutôt être lue, tout d’abord, comme un texte de circonstance imposé par des contingences éditoriales et comme un commentaire visant à assurer la lisibilité d’un texte monstre en le rabattant sur des codes reçus. Examinée sous l’angle de sa construction et de son dispositif d’énonciation, cette « Observation » tient sans doute moins, en outre, d’une préface apportée après coup à un « poème » que d’un manifeste esthétique faisant « observer » et se lever, à l’horizon du texte, l’émergence d’un genre poétique sans précédent. [less ▲]

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See detailObservation ultraviolette des planètes géantes et de leurs satellites à l'aide du téléescope spatial Hubble
Gérard, Jean-Claude ULg; Dols, V.

in Nouvelles de la Science et des Technologies (1990), 8(3-4), 43-46

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See detailObservation urbaine du quartier de Gerland à Lyon
Frankignoulle, Pierre ULg

Report (2008)

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See detailObservational aspects of gravitational lensing
Surdej, Jean ULg

in Fort, B.; Soucail, G.; Mellier, Y. (Eds.) Gravitational Lensing (1990)

Various systematic optical surveys of multiply lensed extragalactic objects presently being conducted are reviewed to describe gravitational lens candidates and the effects of gravitational lensing ... [more ▼]

Various systematic optical surveys of multiply lensed extragalactic objects presently being conducted are reviewed to describe gravitational lens candidates and the effects of gravitational lensing. Optical surveys of highly luminous quasars, quasars, and distant 3C radio sources are employed to discuss these objects' candidacy as gravitationally lensed objects. Some gravitational lens candidates are then described in detail, including 0957 + 561, 1115 + 080, 2237 + 0305, and 2345 + 007. An extensive list of observational evidence for gravitational lensing is then given, including statistical evidence and gravitational lensing in relation to AGN segregation. The examination of gravitational lensing candidates is shown to help determine how significantly this lensing perturbs the view of the distant universe and induces an apparent segregation among different classes of extragalactic objects. [less ▲]

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See detailAn observational asteroseismic study of the pulsating B-stars in the open cluster NGC 884
Saesen, S.; Briquet, Maryline ULg; Aerts, C. et al

in IAU Symposium No. 301 (2013), "Precision Asteroseismology" (Wroclaw), W. Chaplin, J. Guzik, G. Handler & A. Pigulski (eds.) (2014)

Recent progress in the seismic interpretation of field {\beta} Cep stars has resulted in improvements of the physical description in the stellar structure and evolution model computations of massive stars ... [more ▼]

Recent progress in the seismic interpretation of field {\beta} Cep stars has resulted in improvements of the physical description in the stellar structure and evolution model computations of massive stars. Further asteroseismic constraints can be obtained from studying ensembles of stars in a young open cluster, which all have similar age, distance and chemical composition. We present an observational asteroseismic study based on the discovery of numerous multi-periodic and mono-periodic B-stars in the open cluster NGC 884. Our study illustrates the current status of ensemble asteroseismology of a young open cluster. [less ▲]

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See detailObservational Asteroseismology of Hot Subdwarf Stars with the Mont4K/Kuiper Combination at the Steward Observatory Mount Bigelow Station
Fontaine, Gilles; Green, Elizabeth M.; Charpinet, Stéphane et al

in Astronomical Society of the Pacific Conference Series (2014), 481

In the last few years, we have carried out several extensive observational campaigns on pulsating hot subdwarf stars using the Mont4K CCD camera attached to the 1.55 m Kuiper Telescope on Mount Bigelow ... [more ▼]

In the last few years, we have carried out several extensive observational campaigns on pulsating hot subdwarf stars using the Mont4K CCD camera attached to the 1.55 m Kuiper Telescope on Mount Bigelow. The Mont4K is a joint partnership between the University of Arizona and Universite ́ de Montre ́al. It was designed and built at Steward Observatory. Using the Mont4K/Kuiper combination, we have so far, and among others, gathered high-sensitivity broadband light curves for PG 1219+534, PB8783, HS 0702+6043, and Feige 48. We report very briefly on some of the most interesting observational results that came out of these campaigns. [less ▲]

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