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See detailLa réforme du master bioingénieur en Sciences et Technologies de l’Environnement par le biais des compétences
Debouche, Charles ULg

Scientific conference (2012, December 03)

Presentation of the method adopted to elaborate the referential of competences of the Master bioingénieur in Sciences and Technologies of the Environment and to reform the program of study of it

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See detailLa maladie périnéale chez l'enfant porteur d'une MICI
COIMBRA MARQUES, Carla ULg

Conference (2012, December 03)

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See detailChangement climatique 2012
Ozer, Pierre ULg

Scientific conference (2012, December 03)

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See detailTransiting exoplanets from the CoRoT space mission XXI. CoRoT-19b: A low density planet orbiting an old inactive F9V-star
Guenther, E. W.; Diaz, R. F.; Gazzano, J-C et al

in Astronomy and Astrophysics (2012), 537

Observations of transiting extrasolar planets are of key importance to our understanding of planets because their mass, radius, and mass density can be determined. The CoRoT space mission allows us to ... [more ▼]

Observations of transiting extrasolar planets are of key importance to our understanding of planets because their mass, radius, and mass density can be determined. The CoRoT space mission allows us to achieve a very high photometric accuracy. By combining CoRoT data with high-precision radial velocity measurements, we derive precise planetary radii and masses. We report the discovery of CoRoT-19b, a gas-giant planet transiting an old, inactive F9V-type star with a period of four days. After excluding alternative physical configurations mimicking a planetary transit signal, we determine the radius and mass of the planet by combining CoRoT photometry with high-resolution spectroscopy obtained with the echelle spectrographs SOPHIE, HARPS, FIES, and SANDIFORD. To improve the precision of its ephemeris and the epoch, we observed additional transits with the TRAPPIST and Euler telescopes. Using HARPS spectra obtained during the transit, we then determine the projected angle between the spin of the star and the orbit of the planet. We find that the host star of CoRoT-19b is an inactive F9V-type star close to the end of its main-sequence life. The host star has a mass M*=1.21+/-0.05 Msun and radius R*=1.65+/-0.04 Rsun. The planet has a mass of Mp=1.11+/-0.06 Mjup and radius of Rp=1.29+/-0.03 Rjup. The resulting bulk density is only rho=0.71+/-0.06 gcm-3, which is much lower than that for Jupiter. The exoplanet CoRoT-19b is an example of a giant planet of almost the same mass as Jupiter but a 30% larger radius. [less ▲]

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See detailSome misunderstood or unknown LaTeX tricks (VI)
Merciadri, Luca ULg

E-print/Working paper (2012)

Customizing a document class is important in the LaTeX world. We will consider two examples of this using the lettre document class. Next, we will consider a small fraction of a bigger LaTeX problem: the ... [more ▼]

Customizing a document class is important in the LaTeX world. We will consider two examples of this using the lettre document class. Next, we will consider a small fraction of a bigger LaTeX problem: the details of character encoding. [less ▲]

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See detailMicrolensing Binaries with Candidate Brown Dwarf Companions
Shin, I.-G.; Han, C.; Gould, A. et al

in Astrophysical Journal (2012), 760

Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the ... [more ▼]

Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE-2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M [SUB]&sun;[/SUB] and 0.019 ± 0.002 M [SUB]&sun;[/SUB] for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches. [less ▲]

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See detailSpring air temperature accounts for the bimodal temporal distribution of Septoria tritici epidemics in the winter wheat stands of Luxembourg
Beyer, Marco; El Jarroudi, Moussa ULg; Junk, Jürgen et al

in Crop Protection (2012), 42

Septoria tritici is the causal agent of leaf blotch in wheat and among the most damaging fungal cereal pathogens in the humid regions of central Europe. The percentage of the leaf area colonized by S ... [more ▼]

Septoria tritici is the causal agent of leaf blotch in wheat and among the most damaging fungal cereal pathogens in the humid regions of central Europe. The percentage of the leaf area colonized by S. tritici was recorded weekly between April and July every season between 2004 and 2010. A total of 11 cultivars with moderate susceptibility [ratings of 4e6 on a 1 (resistant) to 9 (susceptible) scale] were included. The disease level was assessed on the upper three leaf layers at 2 locations between 2004 and 2006 and at 3 locations between 2007 and 2010. The period between sowing and the point of time, when 50% of the leaf area was necrotized due to colonization by S. tritici (T50) was estimated for each year, site, cultivar and leaf layer by non-linear regression. T50 values followed a bimodal distribution with one maximum at 245 days after sowing (DAS; early epidemics) and one maximum at 270 DAS (late epidemics). Early epidemics were preceded by almost constant daily average temperatures of 13.2 0.8 C between 181 and 210 DAS. Late epidemics were preceded by an approximately linear increase in temperature from 8.7 0.9 to 12.1 0.9 C during the same period of time. Based on these differences, it seems possible to predict whether an early or a late epidemic can be expected at least 35 days before the epidemic outbreak. Temperature sums calculated with a base temperature of 6.6 C starting at sowing and ending when T50 was reached were not significantly different between early and late epidemics (P ¼ 0.73) and averaged 1721 49 days. Fungicide applications, which resulted into a delay of the epidemic development similar to the difference between early and late epidemics, resulted in a yield increase between 11.7 and 12.6%.Septoria tritici is the causal agent of leaf blotch in wheat and among the most damaging fungal cereal pathogens in the humid regions of central Europe. The percentage of the leaf area colonized by S. tritici was recorded weekly between April and July every season between 2004 and 2010. A total of 11 cultivars with moderate susceptibility [ratings of 4e6 on a 1 (resistant) to 9 (susceptible) scale] were included. The disease level was assessed on the upper three leaf layers at 2 locations between 2004 and 2006 and at 3 locations between 2007 and 2010. The period between sowing and the point of time, when 50% of the leaf area was necrotized due to colonization by S. tritici (T50) was estimated for each year, site, cultivar and leaf layer by non-linear regression. T50 values followed a bimodal distribution with one maximum at 245 days after sowing (DAS; early epidemics) and one maximum at 270 DAS (late epidemics). Early epidemics were preceded by almost constant daily average temperatures of 13.2 0.8 C between 181 and 210 DAS. Late epidemics were preceded by an approximately linear increase in temperature from 8.7 0.9 to 12.1 0.9 C during the same period of time. Based on these differences, it seems possible to predict whether an early or a late epidemic can be expected at least 35 days before the epidemic outbreak. Temperature sums calculated with a base temperature of 6.6 C starting at sowing and ending when T50 was reached were not significantly different between early and late epidemics (P ¼ 0.73) and averaged 1721 49 days. Fungicide applications, which resulted into a delay of the epidemic development similar to the difference between early and late epidemics, resulted in a yield increase between 11.7 and 12.6%. [less ▲]

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See detailComment installer et utiliser Endnote Web pour réaliser une bibliographie automatique dans MS Word
Denis, Antoine ULg

Learning material (2012)

Ce petit document vous apprendra en 20 minutes à installer et utiliser le logiciel libre « Endnote Web » qui permet de : a) Créer une base de données bibliographique personnelle et en ligne; b) Insérer et ... [more ▼]

Ce petit document vous apprendra en 20 minutes à installer et utiliser le logiciel libre « Endnote Web » qui permet de : a) Créer une base de données bibliographique personnelle et en ligne; b) Insérer et formater automatiquement une bibliographie dans un document Microsoft Word (Office) [less ▲]

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See detailSignatures of rotation in oscillation spectra
Reese, Daniel ULg; Prat, V.; Barban, C. et al

in Boissier, S.; de Laverny, P.; Nardetto, N. (Eds.) et al SF2A-2012: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (2012, December 01)

Rotation makes oscillation spectra of rapidly rotating stars much more complicated. Hence, new strategies need to be developed in order to interpret such spectra. In what follows, we describe how multi ... [more ▼]

Rotation makes oscillation spectra of rapidly rotating stars much more complicated. Hence, new strategies need to be developed in order to interpret such spectra. In what follows, we describe how multi-colour photometric mode visibilities can be generalised to rapidly rotating stars, while fully taking into account centrifugal deformation and gravity darkening. We then go on to describe some first results as well as a strategy for constraining mode identification. [less ▲]

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See detailCONTRIBUTION OF THE NEW TECHNOLOGIES TO THE REHABILITATION OF THE OLD FALLERS : A PILOT STUDY
ELBOUZ, LEILA; GILLAIN, Sophie ULg; BENDAVID, D et al

in Gériatrie et Psychologie Neuropsychiatrie du Vieillissement (2012), 10(4), 383-390

Purpose of the study: to verify the interest of vibrosphère™ in the rehabilitation of geriatric fallers Material and method: 24 persons aged 85.5 hospitalized in geriatric wards for a fall during the last ... [more ▼]

Purpose of the study: to verify the interest of vibrosphère™ in the rehabilitation of geriatric fallers Material and method: 24 persons aged 85.5 hospitalized in geriatric wards for a fall during the last 6 months are divided in 2 groups. The group one has performed a classical revalidation and the group 2 a rehabilitation with the technics of vibrosphère™, both during 9 days. The assessment is realized on Day 0 and day 10. It consists in a walking test with Locometrix, a postural assessment a time get up and go and the fall efficacity scale. A control group of 20 non faller subjects aged 79,9 is constituted. Results: in the second population a gain (p< 0.05) is obtained for speed of gait, and also a tendancy in a better frequency, length, symmetry and regularity of step. Postural status is better at the end of the 9 days in the grouped using vibrosphère™. The 2 ways of rehabilitation have similar effects on the gait and balance parameters. Conclusion: our study confirms efficiency of rehabilitation program for 9 days which is rather short. The improvements show that vibrosphère™ is a well adapted tool to revalidate geriatric fallers. Its effect on balance should explain the benefit observed in the gait parameters. This technique seems to be complementary with classical rehabilitation in old geriatric hospitalized patients. [less ▲]

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See detailCassini UVIS observations of Titan nightglow spectra
Ajello, Joseph M.; West, Robert A.; Gustin, Jacques ULg et al

in Journal of Geophysical Research. Space Physics (2012), 117

In this paper we present the first nightside EUV and FUV airglow limb spectra of Titan showing molecular emissions. The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed photon emissions of Titan's ... [more ▼]

In this paper we present the first nightside EUV and FUV airglow limb spectra of Titan showing molecular emissions. The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed photon emissions of Titan's day and night limb-airglow and disk-airglow on multiple occasions, including during an eclipse observation. The 71 airglow observations analyzed in this paper show EUV (600-1150 Å) and FUV (1150-1900 Å) atomic multiplet lines and band emissions arising from either photoelectron induced fluorescence and solar photo-fragmentation of molecular nitrogen (N[SUB]2[/SUB]) or excitation by magnetosphere plasma. The altitude of the peak UV emissions on the limb during daylight occurred inside the thermosphere at the altitude of the topside ionosphere (near 1000 km altitude). However, at night on the limb, a subset of emission features, much weaker in intensity, arise in the atmosphere with two different geometries. First, there is a twilight photoelectron-excited glow that persists with solar depression angle up to 25-30 degrees past the terminator, until the solar XUV shadow height passes the altitude of the topside ionosphere (1000-1200 km). The UV twilight glow spectrum is similar to the dayglow but weaker in intensity. Second, beyond 120° solar zenith angle, when the upper atmosphere of Titan is in total XUV darkness, there is indication of weak and sporadic nightside UV airglow emissions excited by magnetosphere plasma collisions with ambient thermosphere gas, with similar N[SUB]2[/SUB] excited features as above in the daylight or twilight glow over an extended altitude range. [less ▲]

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See detailAnalysis of Spin-Orbit Alignment in the WASP-32, WASP-38, and HAT-P-27/WASP-40 Systems
Brown, D. J. A.; Collier Cameron, A.; Díaz, R. F. et al

in Astrophysical Journal (2012), 760

We present measurements of the spin-orbit alignment angle, λ, for the hot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on data obtained using the HARPS spectrograph. We analyze the ... [more ▼]

We present measurements of the spin-orbit alignment angle, λ, for the hot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on data obtained using the HARPS spectrograph. We analyze the Rossiter-McLaughlin effect for all three systems and also carry out Doppler tomography for WASP-32 and WASP-38. We find that WASP-32 (T [SUB]eff[/SUB] = 6140[SUP]+90[/SUP] [SUB]- 100[/SUB] K) is aligned, with an alignment angle of λ = 10fdg5[SUP] + 6.4[/SUP] [SUB] - 6.5[/SUB] obtained through tomography, and that WASP-38 (T [SUB]eff[/SUB] = 6180[SUP]+40[/SUP] [SUB]- 60[/SUB] K) is also aligned, with tomographic analysis yielding λ = 7fdg5[SUP] + 4.7[/SUP] [SUB] - 6.1[/SUB]. The latter result provides an order-of-magnitude improvement in the uncertainty in λ compared to the previous analysis of Simpson et al. We are only able to loosely constrain the angle for HAT-P-27/WASP-40 (T [SUB]eff[/SUB] = 5190[SUP]+160[/SUP] [SUB]- 170[/SUB] K) to λ = 24fdg2[SUP] + 76.0[/SUP] [SUB] - 44.5[/SUB], owing to the poor signal-to-noise ratio of our data. We consider this result a non-detection under a slightly updated version of the alignment test of Brown et al. We place our results in the context of the full sample of spin-orbit alignment measurements, finding that they provide further support for previously established trends. Based on observations (under proposal 087.C-0649) made using the HARPS High Resolution Échelle Spectrograph mounted on the ESO 3.6 m at the ESO La Silla observatory. [less ▲]

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See detailTravaux Pratiques de Télédétection Spatiale
Denis, Antoine ULg

Learning material (2012)

Ce manuel est le support principal des travaux pratiques de télédétection spatiale du cours de télédétection spatiale dispensé sur le Campus d’Arlon Environnement, Université de Liège, Belgique. Les ... [more ▼]

Ce manuel est le support principal des travaux pratiques de télédétection spatiale du cours de télédétection spatiale dispensé sur le Campus d’Arlon Environnement, Université de Liège, Belgique. Les données associées à ces travaux pratiques ne sont disponibles que pour les étudiants inscrits à ce cours. Le logiciel principalement utilisé dans ces travaux est un logiciel payant (ENVI, de la firme EXELIS). Les autres logiciels utilisés sont gratuits et disponibles sur le web: WINDIP, TIMESAT, ViewSpecPro et Google Earth. Les exercices concernent, par ordre d'importance: la classification supervisée d'une image haute résolution (observation, identification des zones d'entrainement et caractérisation statistique des échantillons, classification, validation), l'analyse diachronique de 2 images basses résolution (analyse de changement), l'analyse temporelle de séries d'images basses résolution (profil NDVI) et la caractérisation des saisons de végétation, la création de néo-canaux (NDVI, Tasseled cap, ACP,…) la visualisation 2D et 3D, la correction géométrique d’une image, l'analyse de données hyperspectrales (images et ponctuelles), la découverte de Google Earth, la recherche d'images satellites sur le web,... [less ▲]

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See detailTowards consistent mapping of distant worlds: secondary eclipse scanning of HD189733b
de Wit, Julien; Gillon, Michaël ULg; Demory, Brice-Olivier et al

in Astronomy and Astrophysics (2012), 548

Context. Mapping the brightness distribution of exoplanets is the next frontier for exoplanet infrared photometry studies. For tidally-locked hot Jupiters that transit and are eclipsed by their host star ... [more ▼]

Context. Mapping the brightness distribution of exoplanets is the next frontier for exoplanet infrared photometry studies. For tidally-locked hot Jupiters that transit and are eclipsed by their host star with non-zero impact parameter, the first steps are now possible. Aims. The aim is to use eclipse scanning from occultation ingress/egress and phase curve measurements to constrain exoplanet large-scale brightness structure. Methods. We use archived Spitzer/IRAC 8 {\mu}m data of HD189733 in a global MCMC procedure encompassing six transits, eight secondary eclipses, and a phase curve in a two-step analysis. The first step derives the planet-star system parameters. The second step investigates the structure found in eclipse scanning, using the previous planet-star system parameter derivation as Gaussian priors. Results. We find a 5-sigma deviation from the expected occultation ingress/egress shape for a uniform brightness disk, and demonstrate that this is dominated by large-scale brightness structure and not an occultation timing offset due to a non-zero eccentricity. Our analysis yields a 2D brightness temperature distribution showing a large-scale asymmetric hot spot whose finer structure is limited by the data quality and planet orbit geometry. We also present an improved upper limit for eccentricity, e<0.0081 (95% confidence). Conclusions. Reanalysis of archived HD 189733 data revealed brightness structure by using global analysis that mitigated systematics. Future eclipse scanning observations of the same exoplanet at other wavelengths will probe different atmosphere layers, ultimately generating a large-scale 3D map. [less ▲]

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See detailL'Empowerment au coeur des bouleversements induits par les TIC dans la gestion des ressources humaines
Blavier, André ULg

in RH Publica (2012), (4), 12-15

Observer l’influence des TIC (Technologies de l’Information et de la Communication” sur les ressources humaines à la lumière du seul débat “pour ou contre les réseaux sociaux dans l’entreprise ou ... [more ▼]

Observer l’influence des TIC (Technologies de l’Information et de la Communication” sur les ressources humaines à la lumière du seul débat “pour ou contre les réseaux sociaux dans l’entreprise ou l’organisation ?” est une approche bien trop restrictive. Les défis relatifs à l’évolution des ressources humaines s’inscrivent dans une perspective plus large, celle d’un environnement numérique global. Comme l’a souligné le rapport “Digital Economy Rankings 2010” d’IBM en collaboration avec l’Economist Intelligence Unit (The Economist): “Simply put, there are no alternatives but to become more digital with whatever assets are available”. Parmi ces “assets”, et contrairement à ce qu’un niveau d’automatisation toujours plus important pourrait laisser penser, les ressources humaines vont occuper une place absolument déterminante pour la compétitivité des territoires. [less ▲]

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See detailBiological network inference with tree-based methods
Schrynemackers, Marie ULg

Poster (2012, December)

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See detailDéveloppement d’une ailette d’obus en composite magnésium renforcé de fibres de carbone
Montrieux, Henri-Michel ULg; Mertens, Anne ULg; Lecomte-Beckers, Jacqueline ULg

Report (2012)

This report describes the accomplished breakthrough for the manufacturing of long carbon fibres reinforced magnesium alloy (AZ91). Infiltration can be performed with non-equilibrium conditions such as ... [more ▼]

This report describes the accomplished breakthrough for the manufacturing of long carbon fibres reinforced magnesium alloy (AZ91). Infiltration can be performed with non-equilibrium conditions such as fibres preheating, high liquid compacting pressure and low contact times. Thanks to specific TEOS sol/gel treatment, the reached fibre rate is 60 vol.% and the measured Young's modulus of the composite is ca. 110 GPa. The presence of defects including fibre yarns misorientation, unreinforced areas seems very detrimental to the bending properties. Other advanced infiltration techniques with Al pretreatment (K2ZrF6) of fibres is also considered. [less ▲]

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See detailDépendance à la voiture et déplacements domicile/travail transfrontaliers depuis et vers la Wallonie
Lambotte, Jean-Marc ULg

in Belkacem, Rachid (Ed.) Le travail frontalier au sein de la Grande Région Saar-Lor-Lux. Pratiques, enjeux et Perspectives (2012)

Face au développement sans précédent des mobilités quotidiennes internationales et transrégionales, la recherche présentée dans cet article vise à analyser une thématique encore très peu prospectée par la ... [more ▼]

Face au développement sans précédent des mobilités quotidiennes internationales et transrégionales, la recherche présentée dans cet article vise à analyser une thématique encore très peu prospectée par la recherche en aménagement, celle de la ville compacte écomobile en contexte transfrontalier. Cet article se focalise sur les espaces transfrontaliers qui concernent la Wallonie et l’hypothèse ayant guidé guidé le travail est que la multiplication des collaborations transfrontalières y est un préalable si l’on tient à mettre en place des organisations urbaines qui limitent notre dépendance à l’automobile. L’article fait dans un premier point une analyse évolutive des déplacements domicile – travail entre la Wallonie et les régions qui l’entourent. Il ressort clairement de cet exercice que les flux transfrontaliers et transrégionaux sont en forte augmentation. Dans la suite, l’article développe une analyse des orientations relatives à la maîtrise de la demande de mobilité au travers des politiques d’aménagement du territoire et de transport sur base des intentions contenues au sein des plans stratégiques de développement territorial et de mobilité de trois territoires voisins de la Wallonie. Pour finir, une série de conclusions sont tirées tenant compte du grand écart existant entre les intentions et leur concrétisation. [less ▲]

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