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Peer Reviewed
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)

Detailed reference viewed: 10 (1 ULg)
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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Peer Reviewed
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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Peer Reviewed
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)

Detailed reference viewed: 71 (26 ULg)
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.) (2013, October 01)

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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See detailObservational Astrophysics -- Pierre Léna
Manfroid, Jean ULg

in Ciel et Terre (1989), 105

Not Available

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See detailObservational Constraints on a Self-Enrichment Model in Galactic Halo Globular Clusters
Parmentier, Geneviève ULg; Jehin, Emmanuel ULg; Magain, Pierre ULg et al

in Favata, F.; Kaas, A.; Wilson, A. (Eds.) Star Formation from the Small to the Large Scale (2000)

Not Available

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See detailObservational evidence of a localized magnetic anomaly near Jupiter’s North Pole
Grodent, Denis ULg; Bonfond, Bertrand ULg; Gérard, Jean-Claude ULg et al

Conference (2008, April 18)

We have analyzed more than 1000 HST/ACS images of Jupiter’s ultraviolet auroral emission in the northern hemisphere. A systematic planet center finding algorithm made it possible to infer reliable and ... [more ▼]

We have analyzed more than 1000 HST/ACS images of Jupiter’s ultraviolet auroral emission in the northern hemisphere. A systematic planet center finding algorithm made it possible to infer reliable and consistent jovicentric location of the auroral footprints of Io, Europa and Ganymede. These footprints form reference contours which provide an absolute magnetic mapping from the ionosphere of Jupiter to the equatorial plane, independent of any magnetic field model. So far, the VIP4 magnetic field model is the most accurate in terms of fitting the auroral emissions. However, it cannot reproduce the distorted shape of the satellites UV footpaths in the “kink region” in the northern ionosphere between S3 longitudes 80 ̊-150 ̊. We show that the model is significantly improved by decreasing the VIP4 surface magnetic field in the kink region and by adding a localized dipolar perturbation field beneath the surface. [less ▲]

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