References of "2011"
     in
Bookmark and Share    
Full Text
See detailEcological characterization of Lophira alata (Ekki), a vulnerable timber tree species, in order to develop silvicultural effective strategies
Biwole, Achille ULg; Doucet, Jean-Louis ULg

Poster (2011, December 02)

Ekki, Lophira alata Banks ex C.F.Gaertn., is an African timber species occurring in tropical rainforests. Of important commercial value, this species is logged for its excellent timber properties and has ... [more ▼]

Ekki, Lophira alata Banks ex C.F.Gaertn., is an African timber species occurring in tropical rainforests. Of important commercial value, this species is logged for its excellent timber properties and has been classified by the IUCN as «vulnerable" species. As for many other tropical tree species, the commercial exploitation of Ekki is confronted to an insufficient knowledge about the species’ ecological profile. With a distribution range limited to the Guinea-Congolian region, Ekki often displays insufficient natural regeneration, but the biotic and abiotic factors explaining this deficiency have been hardly characterized. This lack of knowledge makes it difficult to model the population dynamics on the long term. The reproductive biology of Ekki and the genetic variability of its population remains poorly studied too. To address this situation, a fundamental and applied research is being undertaken in the forest concessions managed by Wijma Cameroun SA., covering over 250,000 hectares of rainforest in Southern Cameroon. This study aims to answer four essential questions: (1) what is the phylogenetic relationship between L. alata and L. lanceolata, (2) how paleoclimate and human disturbances impact its distribution and abundance, (3) how to these populations respond to logging over several rotation periods, (4) does logging promote or inhibit the natural regeneration of the species. Several study devices have thus been installed to collect the data needed to improve the characterization of Ekki’s ecology and to conceive silvicultural strategies. [less ▲]

Detailed reference viewed: 91 (20 ULg)
Full Text
Peer Reviewed
See detailEffects of temperature on pacemaker activity induced by mechano-electric feedback in a one-dimensional model of a ring-shaped cardiac fiber
Collet, Arnaud ULg; Desaive, Thomas ULg; Dauby, Pierre ULg

in NCBME (Ed.) 10th Belgian Day on Biomedical Engineering (2011, December 02)

Detailed reference viewed: 28 (14 ULg)
See detailImmununoassay using a biofunctionnalized alumina-coated capacitive biosensor: towards a microfluidic detection of the h5n1 influenza virus
Overstraeten-Schlögel, Nancy; Dupuis, Pascal; Lefévre, Olivia et al

Scientific conference (2011, December 02)

Detailed reference viewed: 12 (5 ULg)
Full Text
See detailLe thermalisme en pleine conscience
Triffaux, Jean-Marc ULg

Conference (2011, December 02)

Detailed reference viewed: 121 (7 ULg)
Peer Reviewed
See detailMultiscale modeling of sprouting angiogenesis
Carlier, Aurélie ULg; Geris, Liesbet ULg; Van Oosterwyck, Hans

Poster (2011, December 02)

Detailed reference viewed: 24 (9 ULg)
Full Text
Peer Reviewed
See detailParameter Identification in a Model of the Cardiovascular System Including the Atria
Pironet, Antoine ULg; Revie, James A.; Paeme, Sabine ULg et al

Poster (2011, December 02)

Detailed reference viewed: 44 (31 ULg)
Full Text
Peer Reviewed
See detailDystocies équines: Données descriptives et approche de la gestion des soins intensifs
Deleuze, Stefan ULg; de la Rebière de Pouyade, Geoffroy ULg; Sandersen, Charlotte ULg et al

Conference (2011, December 02)

La fréquence de fourbures rencontrées après une dystocie semble faible par rapport à la littérature. L’ajout d’héparines fractionnées aux traitements habituels de la métrite du post-partum (ocytocine ... [more ▼]

La fréquence de fourbures rencontrées après une dystocie semble faible par rapport à la littérature. L’ajout d’héparines fractionnées aux traitements habituels de la métrite du post-partum (ocytocine, lavage utérins, antibiotiques et anti-inflammatoires) semble intéressant pour réduire le risque de fourbure. [less ▲]

Detailed reference viewed: 68 (10 ULg)
Full Text
Peer Reviewed
See detailOpening the door is not sufficient : each child has rights to take part in the everyday life of an ECEC service
Camus, Pascale ULg

Conference (2011, December 01)

Despite the fact that Belgium has ratified the UN Convention on the Rights of the Child in 1992, few children with special needs are taken care of in mainstream services. When they have access to a ... [more ▼]

Despite the fact that Belgium has ratified the UN Convention on the Rights of the Child in 1992, few children with special needs are taken care of in mainstream services. When they have access to a service, everything is focused on their deficiency. Professionals think they have to be trained to give what is considered as the “right” treatment to make the child « catch the others up ». There is an alternative way of thinking that focuses on each child’s competences. Adopting this way of thinking means to consider that what matters is every little thing a child can bring to the group, whatever his characteristics may be, and how he can benefit from daily life with other children and adults. The workshop has been focused on conditions that can help increase quality provisions : Who is welcomed everyday? How does an ECEC service welcome each family? Are there children and families who don’t come to ECEC services? Why don’t they come? Are they sufficiently informed on the inclusive approach of ECEC services, Etc The conference has referred to some testimonies collected by professionals from the French Community of Belgium. [less ▲]

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailCOSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. IX. Time delays, lens dynamics and baryonic fraction in HE 0435-1223
Courbin, F.; Chantry, Virginie ULg; Revaz, Y. et al

in Astronomy and Astrophysics (2011), 536

We present accurate time delays for the quadruply imaged quasar HE 0435-1223. The delays were measured from 575 independent photometric points obtained in the R-band between January 2004 and March 2010 ... [more ▼]

We present accurate time delays for the quadruply imaged quasar HE 0435-1223. The delays were measured from 575 independent photometric points obtained in the R-band between January 2004 and March 2010. With seven years of data, we clearly show that quasar image A is affected by strong microlensing variations and that the time delays are best expressed relative to quasar image B. We measured ΔtBC = 7.8 ± 0.8 days, ΔtBD = -6.5 ± 0.7 days and ΔtCD = -14.3 ± 0.8 days. We spacially deconvolved HST NICMOS2 F160W images to derive accurate astrometry of the quasar images and to infer the light profile of the lensing galaxy. We combined these images with a stellar population fitting of a deep VLT spectrum of the lensing galaxy to estimate the baryonic fraction, fb, in the Einstein radius. We measured fb = 0.65-0.10+0.13 if the lensing galaxy has a Salpeter IMF and fb = 0.45-0.07+0.04 if it has a Kroupa IMF. The spectrum also allowed us to estimate the velocity dispersion of the lensing galaxy, σap = 222 ± 34 km s-1. We used fb and σap to constrain an analytical model of the lensing galaxy composed of an Hernquist plus generalized NFW profile. We solved the Jeans equations numerically for the model and explored the parameter space under the additional requirement that the model must predict the correct astrometry for the quasar images. Given the current error bars on fb and σap, we did not constrain H0 yet with high accuracy, i.e., we found a broad range of models with χ2 < 1. However, narrowing this range is possible, provided a better velocity dispersion measurement becomes available. In addition, increasing the depth of the current HST imaging data of HE 0435-1223 will allow us to combine ourconstraints with lens reconstruction techniques that make use of the full Einstein ring that is visible in this object. Based on observations made with the 1.2 m Euler Swiss Telescope, the 1.5 m telescope of Maidanak Observatory in Uzbekistan, and with the 1.2 m Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The NASA/ESA Hubble Space Telescope data was obtained from the data archive at the Space Telescope Science Institute, which is operated by AURA, the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS-5-26555.Light curves are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/536/A53 [less ▲]

Detailed reference viewed: 33 (12 ULg)
See detailRotation on the oscillation spectrum of solar-like stars
Suárez, J. C.; Goupil, M.-J.; Reese, Daniel ULg et al

in Alecian, G.; Belkacem, K.; Samadi, R. (Eds.) et al SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (2011, December 01)

One of the main sources of uncertainty in the asteroseismic models of solar-like stars is the poor match between predicted oscillation frequencies and observed ones in the very high frequency domain ... [more ▼]

One of the main sources of uncertainty in the asteroseismic models of solar-like stars is the poor match between predicted oscillation frequencies and observed ones in the very high frequency domain. Today, such deviation is usually corrected by fitting the affected frequencies with polynomials which are then physically explained by possible effects of turbulence, diffusion, etc., i.e., the so-called ``surface effects". In this work, we show that the effect of the stellar deformation due to rotation is of the same order or even larger than the aforementioned surface effects. Moreover, we show that rotation effects, even for the low velocities generally observed in solar-like stars, becomes important for the asteroseismic analysis and cannot be neglected when modeling such stars. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Full Text
Peer Reviewed
See detailHerschel discovery of a new class of cold, faint debris discs
Eiroa, C.; Marshall, J. P.; Mora, A. et al

in Astronomy and Astrophysics (2011), 536

We present Herschel PACS 100 and 160 μm observations of the solar-type stars α Men, HD 88230 and HD 210277, which form part of the FGK stars sample of the Herschel open time key programme (OTKP) DUNES ... [more ▼]

We present Herschel PACS 100 and 160 μm observations of the solar-type stars α Men, HD 88230 and HD 210277, which form part of the FGK stars sample of the Herschel open time key programme (OTKP) DUNES (DUst around NEarby Stars). Our observations show small infrared excesses at 160 μm for all three stars. HD 210277 also shows a small excess at 100 μm, while the 100 μm fluxes of α Men and HD 88230 agree with the stellar photospheric predictions. We attribute these infrared excesses to a new class of cold, faint debris discs. Both α Men and HD 88230 are spatially resolved in the PACS 160 μm images, while HD 210277 is point-like at that wavelength. The projected linear sizes of the extended emission lie in the range from ~115 to ≤ 250 AU. The estimated black body temperatures from the 100 and 160 μm fluxes are ≲22 K, and the fractional luminosity of the cold dust is L[SUB]dust[/SUB]/L[SUB] ⋆ [/SUB] ~ 10[SUP]-6[/SUP], close to the luminosity of the solar-system's Kuiper belt. These debris discs are the coldest and faintest discs discovered so far around mature stars, so they cannot be explained easily invoking "classical" debris disc models. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. [less ▲]

Detailed reference viewed: 47 (0 ULg)
See detailLa disposition générale anti-abus de l'article 344, § 1er, CIR/92
Bourgeois, Marc ULg

Conference (2011, December 01)

Detailed reference viewed: 30 (4 ULg)
Full Text
See detailL'astronomie dans le monde
Manfroid, Jean ULg

in Ciel (Le) (2011), 73

Rosetta et Lutétia; Eau et disque proto-planétaire; Nouveaux amas; Galaxies primitives; Trou noir supermassif; Réionisation et premières étoiles; FERMI; ALMA

Detailed reference viewed: 9 (6 ULg)
See detailAuroral counterpart of magnetic field dipolarizations in Saturn's tail
Jackman, C. M.; Achilleos, N.; Bunce, E. J. et al

in American Geophysical Union, Fall Meeting 2011, abstract #SM14A-07 (2011, December 01)

Following magnetic reconnection in a planetary magnetotail, newly closed field lines can be rapidly accelerated back towards the planet, becoming "dipolarized" in the process. At Saturn, dipolarizations ... [more ▼]

Following magnetic reconnection in a planetary magnetotail, newly closed field lines can be rapidly accelerated back towards the planet, becoming "dipolarized" in the process. At Saturn, dipolarizations can be initially identified from the magnetometer data by looking for a southward turning of the magnetic field, indicating the transition from a radially stretched configuration to a more dipolar field topology. The highly stretched geometry of the kronian magnetotail lobes gives rise to a tail current which flows eastward (dusk to dawn) in the near equatorial plane across the centre of the tail. During reconnection and associated dipolarization of the field, the inner edge of this tail current can be diverted through the ionosphere, in a situation analogous to the substorm current wedge picture at Earth [McPherron et al. 1973]. We present a picture of the current circuit arising from this tail reconfiguration, and outline the equations which govern the field-current relationship. We show a number of examples of dipolarizations as identified in the Cassini magnetometer data and use this formalism to calculate limits for the ionospheric current density that would arise for these examples. In addition to the magnetometer data, we also present data from the Cassini VIMS and UVIS instruments which have observed small 'spots' of auroral emission lying near the main oval - features thought to be associated with dipolarizations in the tail. We compare the auroral intensities as predicted from our calculation with the observed spot sizes and intensities. [less ▲]

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailThe Solar Sail Materials (SSM) project – Status of activities
Della Vedova, Florio; Henrion, Didier; Leipold, Manfred et al

in Advances in Space Research (2011), 48(11), 1922-1926

Detailed reference viewed: 25 (4 ULg)