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See detailObservational Material / Ap-Stars
Manfroid, Jean ULg; Schneider, H.

in A Peculiar Newsletter (1982), 8

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See detailObservational results for northern and southern (candidate) gamma Doradus stars .
De Cat, P.; Goossens, K.; Bouckaert, F. et al

in Memorie della Società Astronomica Italiana : Journal of the Italian Astronomical Society (2006), 77

We report on observational results obtained for 78 objects originally classified as bona-fide or candidate gamma Doradus stars. For the southern objects, we gathered echelle spectra with the CORALIE ... [more ▼]

We report on observational results obtained for 78 objects originally classified as bona-fide or candidate gamma Doradus stars. For the southern objects, we gathered echelle spectra with the CORALIE spectrograph attached to the Euler telescope in 1998-2003 and/or Johnson-Cousins B,V,I_c observations with the MODULAR photometer attached to the 0.5-m SAAO telescope in 1999-2000. For the northern objects, we obtained Geneva U,B,B_1,B_2,V,V_1,G observations with the P7 photometer attached to the 1.2-m Mercator telescope in 2001-2004. At least 15 of our objects are binaries, of which 7 are new. For 6 binaries, we determined the orbit for the first time. At least 17 objects show profile variations and at least 12 objects are multiperiodic photometric variables. Our results allow us to upgrade 11 objects to bona-fide gamma Doradus stars and to downgrade 8 objects to constant up to the current detection limits. Mode identification is still ongoing, but so far, only l = 1 and 2 modes have been identified. [less ▲]

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See detailAn observational study of line-profile variable B stars
Briquet, Maryline ULg

Doctoral thesis (2003)

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See detailAn Observational Study of Mixing in Fast-Rotating Massive Stars: Description of the Method and Very First Results
Morel, Thierry ULg; Palate, Matthieu ULg; Rauw, Grégor ULg

in Massive Stars: From alpha to Omega (2013, June 01)

Collecting He and CNO abundances for a large sample of fast-rotating massive stars is crucial for addressing the efficiency of rotational mixing in these objects. This is becoming a pressing issue ... [more ▼]

Collecting He and CNO abundances for a large sample of fast-rotating massive stars is crucial for addressing the efficiency of rotational mixing in these objects. This is becoming a pressing issue following the recent recognition based on observations by the VLT-FLAMES Survey of massive stars that fast rotators can show no signs of deep mixing contrary to the predictions of models. We have embarked in a project aiming at determining the abundances of the key elements indicators of mixing in a sample of bright, Galactic OB dwarfs. We present here the method and the very first results for two of the fastest OB stars known vsin i = 400 km/s : HD 93521 and zeta Oph. [less ▲]

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See detailObservational survey of NSAID-related upper gastro-intestinal adverse events in Belgium
Belaiche, Jacques ULg; Burette, A.; De Vos, M. et al

in Acta Gastro-Enterologica Belgica (2002), 65(2, Apr-Jun), 65-73

Objectives : To evaluate the impact of NSAID use on current routine upper GI endoscopy (UGIE) and to compare the lesions found in NSAID users and non-users. Methods : Participating gastroenterologists ... [more ▼]

Objectives : To evaluate the impact of NSAID use on current routine upper GI endoscopy (UGIE) and to compare the lesions found in NSAID users and non-users. Methods : Participating gastroenterologists; consecutively documented outpatients with and without suspicion of bleeding, referred for upper gastrointestinal endoscopy. Patient characteristics, presence of risk factors, NSAID use and endoscopic findings were reported on standard data collection forms. Main results : A total of 2685 non-bleeding and 159 bleeding patients were enrolled within a time period of 2 months. NSAID therapy was present in 20% of the non-bleeding patients and at least 9% of referrals for endoscopy were directly related to suspected NSAID adverse events. Nearly half of acute bleeding patients (42%) were NSAID users, including aspirin for cardioprevention. Warning digestive symptoms prior to acute bleeding were frequently absent (56%). Oesophagitis was the main endoscopic diagnosis (51% of patients). Gastroduodenal (GD) ulcer was significantly more frequent in NSAID users, whereas oesophagitis and bleeding oesophageal varices were more frequent among non-users. Analysis of odds ratio's demonstrated NSAID use to significantly increase the risk for gastric ulcer in the whole patient group (OR = 2.73; 95% confidence interval (CI) : 1.983.77; p < 0.001) and, in addition, for duodenal ulcer in the elderly (>65y) subgroup (OR = 2.91; 95 % CI : 1.52-5.59; p < 0.05). Conclusions : This survey confirms the high incidence of GD ulcers in NSAID users and the risk for serious gastrointestinal complications, often occurring without warning symptoms. It underlines the impact of NSAID use on the routine endoscopy load, the necessity of careful selection of patients for NSAID prescriptions and the need for gastropreventive measures, particularly in elderly patients and patients associating multiple risk factors. [less ▲]

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2011)

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2011), (mai-juin), 221-222

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2009), (sept-Oct), 483-484

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2006), (mars-avril), 132-133

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2006), (mars-avril),

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Lecocq, Pascale ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2009)

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Lecocq, Pascale ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2009)

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Lecocq, Pascale ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2001), (15), 652-654

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2000), 10-11

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2013)

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Lecocq, Pascale ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2013)

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See detailObservations and asteroseismic analysis of the rapidly pulsating hot B subdwarf PG 0911+456
Randall, Suzanna K.; Green, Elizabeth M.; Van Grootel, Valérie ULg et al

in Astronomy and Astrophysics (2007), 476

Aims:The principal aim of this project is to determine the structural parameters of the rapidly pulsating subdwarf B star PG 0911+456 from asteroseismology. Our work forms part of an ongoing programme to ... [more ▼]

Aims:The principal aim of this project is to determine the structural parameters of the rapidly pulsating subdwarf B star PG 0911+456 from asteroseismology. Our work forms part of an ongoing programme to constrain the internal characteristics of hot B subdwarfs with the long-term goal of differentiating between the various formation scenarios proposed for these objects. So far, a detailed asteroseismic interpretation has been carried out for 6 such pulsators, with apparent success. First comparisons with evolutionary theory look promising, however it is clear that more targets are needed for meaningful statistics to be derived. Methods: The observational pulsation periods of PG 0911+456 were extracted from rapid time-series photometry using standard Fourier analysis techniques. Supplemented by spectroscopic estimates of the star's mean atmospheric parameters, they were used as a basis for the “forward modelling” approach in asteroseismology. The latter culminates in the identification of one or more “optimal” models that can accurately reproduce the observed period spectrum. This naturally leads to an identification of the oscillations detected in terms of degree ℓ and radial order k, and infers the structural parameters of the target. Results: The high S/N low- and medium resolution spectroscopy obtained led to a refinement of the atmospheric parameters for PG 0911+456, the derived values being T_eff = 31 940 ± 220 K, log g = 5.767 ± 0.029, and log He/H = -2.548 ± 0.058. From the photometry it was possible to extract 7 independent pulsation periods in the 150-200 s range with amplitudes between 0.05 and 0.8% of the star's mean brightness. There was no indication of fine frequency splitting over the 68-day time baseline, suggesting a very slow rotation rate. An asteroseismic search of parameter space identified several models that matched the observed properties of PG 0911+456 well, one of which was isolated as the “optimal” model on the basis of spectroscopic and mode identification considerations. All the observed pulsations are identified with low-order acoustic modes with degree indices ℓ = 0,1,2 and 4, and match the computed periods with a dispersion of only 0.26%, typical of the asteroseismological studies carried out to date for this type of star. The inferred structural parameters of PG 0911+456 are T_eff = 31 940 ± 220 K (from spectroscopy), log {g} = 5.777 ± 0.002, Mast/Msun = 0.39 ± 0.01, log{M_env/Mast} = -4.69 ± 0.07, R/Rsun = 0.133 ± 0.001 and L/Lsun = 16.4 ± 0.8. We also derive the absolute magnitude MV = 4.82 ± 0.04 and a distance d = 930.3 ± 27.4 pc. [less ▲]

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See detailObservations and asteroseismological analysis of the rapid subdwarf B pulsator EC 09582-1137
Randall, Suzanna K.; Van Grootel, Valérie ULg; Fontaine, Gilles et al

in Astronomy and Astrophysics (2009), 507

We made photometric and spectroscopic observations of the rapidly pulsating subdwarf B star EC 09582-1137 with the aim of determining the target's fundamental structural parameters from asteroseismology ... [more ▼]

We made photometric and spectroscopic observations of the rapidly pulsating subdwarf B star EC 09582-1137 with the aim of determining the target's fundamental structural parameters from asteroseismology. This analysis forms part of a long-term programme geared towards distinguishing between different proposed formation scenarios for hot B subdwarfs on the basis of their internal characteristics. So far, secure asteroseismic solutions have been computed for 9 of these pulsators, and first comparisons with results from evolutionary calculations look promising. The new data comprise 30 h of fast time-series photometry obtained with SUSI2 at the NTT on La Silla, Chile, as well as 1 h of low-resolution spectroscopy gathered with EMMI, also mounted on the NTT. From the photometry we detected 5 independent harmonic oscillations in the 135-170 s period range with amplitudes up to 0.5% of the mean brightness of the star. In addition, we extracted two periodicities interpreted as components of a rotationally split multiplet that indicate a rotation period of the order of 2-5 days. We also recovered the first harmonic of the dominant pulsation, albeit at an amplitude below the imposed 4σ detection threshold. The spectroscopic observations led to the following estimates of the atmospheric parameters of EC 09582-1137: T_eff = 34 806±233 K, log{g} = 5.80±0.04, and log N(He)/N(H) = -1.68±0.06. Using the observed oscillations as input, we searched in model parameter space for unique solutions that present a good fit to the data. Under the assumption that the two dominant observed periodicities correspond to radial or dipole modes, we were able to isolate a well-constrained optimal model that agrees with the atmospheric parameters derived from spectroscopy. The observed oscillations are identified with low-order acoustic modes with degree indices ℓ = 0, 1, 2, and 4 and match the computed periods with a dispersion of 0.57%. Non-adiabatic calculations reveal all theoretical modes in the observed period range to be unstable, an important a posteriori consistency check for the validity of the optimal model. The inferred structural parameters of EC 09582-1137 are T_eff = 34 806 K (from spectroscopy), log{g} = 5.788±0.004, Mast = 0.485±0.011 Msun, log{(M_env/Mast)} = -4.39±0.10, R = 0.147±0.002 Rsun, and L = 28.6±1.7 Lsun. We additionally derive the absolute magnitude MV = 4.44±0.05 and the distance d = 1460±66 pc. [less ▲]

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See detailObservations and comments on the Walloon Competitive Clusters
Antoine, Mélanie ULg

Conference (2008, January)

In recent years, the promotion of R&D partnerships between universities, research labs and companies has become a key feature of innovation and development public policies. However, these collaborations ... [more ▼]

In recent years, the promotion of R&D partnerships between universities, research labs and companies has become a key feature of innovation and development public policies. However, these collaborations turn out to be fragile and their management very complex. In our literature review, the congruence between the nature of innovations (i.e. their radicalness) and the cooperation practices appears as a potentially powerful explanatory factor of interfirm innovation project’s outcome. Following this hypothesis, we explore, on two case studies of projects subsidized by the Walloon Competitive Clusters program, the way actors innovate and organize their actions. Though they face similar constraints, these projects illustrate diverse configurations, not only as to the nature of innovations but also as to cooperation practices. Besides, the analysis reveals that the criteria used to characterize the nature of innovations do not necessarily form a homogeneous set of factors. Considering these observations, we try to identify the main challenges faced by both projects’ partners. [less ▲]

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