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See detailEvolution of the Io Footprint Brightness II: Modeling
Hess, Sébastien; Bonfond, Bertrand ULg; Chantry, Virginie ULg et al

in Planetary and Space Science (2013), 88

The interaction of Io with the Jovian magnetosphere creates the best known and brightest satellite-controlled aurorae in our solar system. These aurorae are generated by the precipitation of electrons ... [more ▼]

The interaction of Io with the Jovian magnetosphere creates the best known and brightest satellite-controlled aurorae in our solar system. These aurorae are generated by the precipitation of electrons, which are accelerated by the Alfvén waves carrying the current between the satellite and the planet. A recent study computed the energy deposited on top of Jupiter's ionosphere due to the electron precipitation and retrieved the correct mean brightness of Io-related aurorae. The model developed in this study takes into account the acceleration mechanism and the Alfvén wave propagation effects. We use the same method to investigate the brightness variation of the different components of the Io footprint as a function of longitude. These observations are discussed in a companion paper. We identify several effects that act together to modulate the footprint brightness such as Alfvén wave reflections, magnetic mirroring of the electrons, the local interaction at Io and kinetic effects close to Jupiter. We identify the effects contributing the most to the modulation of the brightnesses of the three brightest components of the Io footprints: the main and reflected Alfvén wing spots and the transhemispheric electron spot. We show in particular that the modulation of the efficiency of the electron acceleration can be of greater importance than the modulation of the power generated at Io. We reproduce the average modulation of the spot brightnesses and present an extensive discussion of possible explanations for the observed features not reproduced by our model. [less ▲]

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See detailEvolution of the Io footprint morphology
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2008, April)

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See detailEvolution of the Kızılırmak river and its interaction with the North Anatolian Fault, Turkey
Drab, Laureen; Hubert, Aurelia ULg; Benedetti, Lucilla et al

in AGU Abstract (2010, December)

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See detailEvolution of the Peierls distortion in liquid As xSb 1-x compounds
Raty, Jean-Yves ULg; Gaspard, Jean-Pierre ULg; Ceolin, R. et al

in Journal of Non-Crystalline Solids (1998), 232-234

The local order in the liquid binary alloy As xSb 1-x (0lesxles1) is studied by short-wavelength (lambda=0.7 Aring) neutron scattering. The coordination number (Z) and the interatomic distances (d) are ... [more ▼]

The local order in the liquid binary alloy As xSb 1-x (0lesxles1) is studied by short-wavelength (lambda=0.7 Aring) neutron scattering. The coordination number (Z) and the interatomic distances (d) are analyzed in terms of the As concentration: Z increases continuously, from a value of 3.5 for pure arsenic to a value of 6.3 for pure antimony, whereas d shows a departure from Vegard's rule. The interatomic distance increases in the range 0.15lesxles1.00 and is almost constant in the range 0.00lesxles0.15. A simple tight-binding model is developed, which indicates that the relevant parameter is the hardness of the core repulsion between the atoms [less ▲]

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See detailEvolution of the Peierls distortion in liquid AsxSb1-x compounds
Raty, Jean-Yves ULg; Gaspard, Jean-Pierre ULg; Céolin, R. et al

in Journal of Non-Crystalline Solids (1998), 232-234

The local order in the liquid binary alloy AsxSb1-x (0 ≤ x ≤ 1) is studied by short-wavelength (λ = 0.7 Å) neutron scattering. The coordination number (Z) and the interatomic distances (d) are analyzed in ... [more ▼]

The local order in the liquid binary alloy AsxSb1-x (0 ≤ x ≤ 1) is studied by short-wavelength (λ = 0.7 Å) neutron scattering. The coordination number (Z) and the interatomic distances (d) are analyzed in terms of the As concentration: Z increases continuously, from a value of 3.5 for pure arsenic to a value of 6.3 for pure antimony, whereas d shows a departure from Vegard's rule. The interatomic distance increases in the range 0.15 ≤ x ≤ 1.00 and is almost constant in the range 0.00 ≤ x ≤ 0.15. A simple tight-binding model is developed, which indicates that the relevant parameter is the hardness of the core repulsion between the atoms. © 1998 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailEvolution of the periodicity of the W UMa system Epsilon CrA
Manfroid, Jean ULg; Heck, A.; Lunel, M. et al

in Astronomy and Astrophysics (1987), 176

Photometric uvby observations of Epsilon CrA obtained with the 1-m telescope at ESO during 1985 are compiled in tables along with published photometry from the period 1960-1984 and analyzed ... [more ▼]

Photometric uvby observations of Epsilon CrA obtained with the 1-m telescope at ESO during 1985 are compiled in tables along with published photometry from the period 1960-1984 and analyzed comprehensively. The results are presented in O-C diagrams and discussed, and a relative increase of 0.00001 in the period of the object is detected. It is pointed out that this change may have been gradual (over a 5-10-yr period) or abrupt (at about HJD 2,440,000), but that the period appears to have become stable again in the most recent observations. [less ▲]

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See detailEvolution of the polarization of the optical afterglow of the γ-ray burst GRB030329
Greiner, Jochen; Klose, Sylvio; Reinsch, Klaus et al

in Nature (2003), 426

The association of a supernova with GRB030329 strongly supports the `collapsar' model of γ-ray bursts, where a relativistic jet forms after the progenitor star collapses. Such jets cannot be spatially ... [more ▼]

The association of a supernova with GRB030329 strongly supports the `collapsar' model of γ-ray bursts, where a relativistic jet forms after the progenitor star collapses. Such jets cannot be spatially resolved because γ-ray bursts lie at cosmological distances; their existence is instead inferred from `breaks' in the light curves of the afterglows, and from the theoretical desire to reduce the estimated total energy of the burst by proposing that most of it comes out in narrow beams. Temporal evolution of the polarization of the afterglows may provide independent evidence for the jet structure of the relativistic outflow. Small-level polarization (~1-3 per cent) has been reported for a few bursts, but its temporal evolution has yet to be established. Here we report polarimetric observations of the afterglow of GRB030329. We establish the polarization light curve, detect sustained polarization at the per cent level, and find significant variability. The data imply that the afterglow magnetic field has a small coherence length and is mostly random, probably generated by turbulence, in contrast with the picture arising from the high polarization detected in the prompt γ-rays from GRB021206 (ref. 18). [less ▲]

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See detailEvolution of the populations of Cystoseira balearica (Phaeophyceae) and epiphytic Bangiophyceae in the Bay of Calvi (Corsica) in the last eight years
Hoffman, Lucien; Clarisse, Serge; Detienne, Xavier et al

in Bulletin de la Société Royale des Sciences de Liège (1988), 4-5

In a number of stations covering the Bay of Calvi (Corsica, Mediterranean Sea) we studied the development of the macroscopic brown alga Cyctoseira balearica and of the epiphytic microscopic Bangiophyceae ... [more ▼]

In a number of stations covering the Bay of Calvi (Corsica, Mediterranean Sea) we studied the development of the macroscopic brown alga Cyctoseira balearica and of the epiphytic microscopic Bangiophyceae. Cystoseira balearica is a major component of infralittoral communities on rocky substrates and Bangiophyceae have been considered indicators of eutrophication. The epiphytic Bangiophyceae have indeed their optimal developement near the sewages discharges (especially in summer) and near the town of Calvi. Since 1981 an increase is observed in the abundance of the Bangiophycae. Cystoseira balearica, a pollution-sensitive species, is not present in the harbours of the town of Cavi and near the sewage dicharges. Since 1980 the coverage and the standing crop of this alga have decreased. The increase of Bangiophyceae and the concurrent decrease of Cyctoseira balearica seem to indicate an increasing pollution of the waters of the Bay of Calvi in the period 1980 - 1988. [less ▲]

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See detailEvolution of the prevalence and characteristics of anemia in inflammatory bowel diseases between 1993 and 2003
Vijverman, A.; Piront, Patricia ULg; Belaiche, Jacques ULg et al

in Acta Gastro-Enterologica Belgica (2006), 69(1, Jan-Mar), 1-4

Introduction : Anemia has been considered as an overlooked complication of inflammatory bowel disease. Studies dating back to the 80ties and the 90ties have shown 30% of anemia among inflammatory bowel ... [more ▼]

Introduction : Anemia has been considered as an overlooked complication of inflammatory bowel disease. Studies dating back to the 80ties and the 90ties have shown 30% of anemia among inflammatory bowel disease (IBD) patients. More recently, the broader use of immunosuppressive drug and infliximab allowing better mucosal healing as well as a more aggressive treatment of anemia, including the use of safer form of IV iron, may have influenced the prevalence of anemia among IBD patients. Our aim was to asses the prevalence and characteristics of anemia among two cohorts of IBD patients at 10 years interval and to look for associated clinical or demographic factors. Methods: using the IBD patients register of one senior gastroenterologist, we identified IBD patients he had consecutively seen and who had blood test at the outpatient clinic during the years 1993 and 2003. Demographic and clinical characteristics, treatment for Crohn's disease, blood test results and treatment of anemia were recorded and compared between these two cohorts. Anemia was defined as an hemoglobin level lower than the normal value of the laboratory of our hospital. Results : 80 and 90 patients were identified in 1993 and 2003, respectively. There was no significant difference between the two cohorts, according to age, gender, disease type, duration or location. There were 27/80 (33.8%) and 15/90 (16.7%) anemic patients in 1993 and 2003, respectively (P = 0.013). The prevalence of severe anemia (hemoglobin level < 10.5 g/100 ml) was similar in the two cohorts (6.3% and 5.6%). Characteristics of the anemia were similar in the two cohorts with a majority of iron deficiency anemia and inflammatory anemia. Ferritin and CRP levels were not significantly different in the two cohorts. The only significant difference was a more frequent use of immunosuppressive treatment and infliximab in 2003 than in 1993 (33.3% vs. 13.8%; P = 0.0038, RR :0.41, 0.22-0.77) Conclusions : Prevalence of mild to moderate anemia has significantly decreased in our population over the last 10 years. The only difference detected between the two cohorts was the increased use of immunosuppressive drug (mainly azathioprine). [less ▲]

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See detailEvolution of the shoot density of the Posidonia oceanica bed of Calvi Bay (Corsica).
Soullard, Mady; Dauby, Patrick ULg; Bouquegneau, Jean-Marie ULg

Conference (1992, February)

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See detailEvolution of the surface chemistry of carbon xerogels with very different textural properties by chemical activation and oxidation
Zubizaretta, Leire; Arenillas, A.; Pirard, Jean-Paul ULg et al

in Proceedings of the International Carbon Conference 2009 (2009)

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See detailEvolution of the surface chemistry of carbon xerogels with very different textural properties by chemical activation and oxidation
Zubizarreta, Leire; Arenillas, A.; Pirard, Jean-Paul ULg et al

Poster (2009, June 14)

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See detailEvolution of the theoretical power spectrum of solar-like oscillations along the ascending phase on the red giant branch.
Grosjean, Mathieu ULg; Montalban Iglesias, Josefa ULg; Samadi, Reza et al

Poster (2012, November)

CoRoT and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. An important question comes from the observation of mixed ... [more ▼]

CoRoT and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. An important question comes from the observation of mixed modes : When during the star’s ascension on the RGB are mixed-modes more likely to be detectable ? We follow the evolution of a star on the RGB and investigate the effect of its ascension on theoretical power spectrum. Equilibrium models (computed with the code ATON) represent four different stages of a star on the RGB. The mass of the star (1.5M") is in the typical mass range of stars observed by CoRoT and Kepler. We used a non-radial non-adiabatic code to compute the theoretical solar-like oscillations of these models. An important output of these calculations is the theoretical lifetimes of the modes. Then we computed the oscillation amplitudes through a stochastic excitation model. These computations allow us to draw theoretical power spectrum and discuss the possibility to observe mixed-modes at different evolutionary stages on the RGB. We found that structure modifications in a star ascending the RGB have an important impact on theoretical power spectrum of solar-like oscillations. Efficiencies of trapping and lifetimes of mixed modes are indeed strongly affected by this evolution. [less ▲]

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See detailEvolution of the theoretical power spectrum of solar-like oscillations along the ascending phase on the red giant branch.
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg; Belkacem, Kevin et al

in Astronomical Society of the Pacific Conference Series (2013, December), 479

CoRoT and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. An important question comes from the observation of mixed ... [more ▼]

CoRoT and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. An important question comes from the observation of mixed modes : When during the star’s ascension on the RGB are mixed-modes more likely to be detectable ? We follow the evolution of a star on the RGB and investigate the effect of its ascension on theoretical power spectrum. Equilibrium models (computed with the code ATON) represent four different stages of a star on the RGB. The mass of the star (1.5M") is in the typical mass range of stars observed by CoRoT and Kepler. We used a non-radial non-adiabatic code to compute the theoretical solar-like oscillations of these models. An important output of these calculations is the theoretical lifetimes of the modes. Then we computed the oscillation amplitudes through a stochastic excitation model. These computations allow us to draw theoretical power spectrum and discuss the possibility to observe mixed-modes at different evolutionary stages on the RGB. We found that structure modifications in a star ascending the RGB have an important impact on theoretical power spectrum of solar-like oscillations. Efficiencies of trapping and lifetimes of mixed modes are indeed strongly affected by this evolution. [less ▲]

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See detailThe Evolution Of The Volatile Compounds By Aging, In Apple Vinegar Flavored With Rosmarinus Officinalis L., Using A HS/GC-MS Technique
Truta, Delia-Mihaela ULg; Tofana, Maria; Socaci, Sonia Ancuta

in Journal of Agroalimentary Processes and Technologies (2010), 16(2), 155-158

Apple vinegar, made from apple juice or concentrated apple juice throuth a double fermentation, it’s widely used as a beverage and food preserver in traditional medicine and healthy diets. The apple ... [more ▼]

Apple vinegar, made from apple juice or concentrated apple juice throuth a double fermentation, it’s widely used as a beverage and food preserver in traditional medicine and healthy diets. The apple vinegar used in this study was flavored using 2 methods of extraction for the active principles from Rosmarinus officinalis L.: maceration and ultrasounds. This paper aims for the analysis and identification of the biological active compounds from the flavored vinegar, using a Headspace /Gas Chromatographic – Mass Spectrometry analysis, at the bottling of the process and after a year of aging the vinegar in glass bottles. A various number of volatile compounds, specific to rosemary, were identified in the vinegar also from the beginning of bottling. The volatile compounds ranged during the aging process, but the main ones, that were specific to rosemary, and to the apple vinegar, were the same. [less ▲]

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See detailEvolution of time measurement in Astronomy
Biémont, Emile ULg

in Heck, A. (Ed.) Information Handling in Astronomy - Historical Vistas (2003)

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See detailEvolution of Treatment and Investigative Approaches in Sleep Medicine
Ly, Julien; Chellappa, Sarah Laxhmi ULg; MAQUET, Pierre ULg

in Billiard, Michael (Ed.) Sleep Medicine: a comprehensive guide (in press)

Detailed reference viewed: 36 (14 ULg)