References of "Scientific congresses and symposiums"
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See detailEstradiol, a key endocrine signal in the sexual differentiation and activation of reproductive behavior in quail
Balthazart, Jacques ULg

in Comparative Biochemistry & Physiology Part A : Molecular & Integrative Physiology (2007, August), 148(Suppl. 1), 27

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See detailSpatial and temporal (30 yr.) variations of lead geochemical signature in a macrotidal highly polluted estuary
Taillez, A.; Jacqmot, A.; Petit, Jérôme et al

in Geochimica et Cosmochimica Acta (2007, August), 71(15, Suppl. S), 993-993

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See detailCarbon nanotubes synthesis by CCVD process : kinetic study on a Fe-Co/Al2O3 catalyst
Pirard, Sophie ULg; Douven, Sigrid ULg; Bossuot, Christophe et al

Poster (2007, August)

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See detailFasciola hepatica: An assessment of the vectorial capacity of Radix labiata and R. balthica commonly found in Belgium
Caron, Yannick ULg; Lasri, Saadia; Losson, Bertrand ULg

Conference (2007, August)

A previous study in Belgium revealed that genetic material of Fasciola sp. was present in four local snail species: Galba truncatula, Radix peregra, Radix ovata and Lymnaea stagnalis. Laboratory cultures ... [more ▼]

A previous study in Belgium revealed that genetic material of Fasciola sp. was present in four local snail species: Galba truncatula, Radix peregra, Radix ovata and Lymnaea stagnalis. Laboratory cultures of these four species were experimentally infected with F. hepatica. The collected metacercariae were fed to rats and the infection in that vertebrate hosts was monitored through several techniques. The mortality rates in the breeding unit was less than 10 % in G. truncatula, R. peregra, and L. stagnalis colonies. Microscopy revealed the presence of larval stages in 78.3 % and 48 % of G. truncatula and R. peregra snails, respectively. These data were confirmed by a PCR that amplifies a parasite specific sequence. R. peregra shed fewer metacercariae and more irregularly than G. truncatula. In R. ovata and L. stagnalis the infection rates were low. Specific DNA was detected in both cases by PCR but no metacercariae were shed. The metacercariae shed by R. peregra were as infective to rats as those from G. truncatula. The PCR technique was more sensitive than microscopic examination. This study demonstrated that R. peregra may act as an accidental intermediate host for F. hepatica in Belgium. [less ▲]

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See detailCombined analysis of fourteen nuclear genes refines the Ursidae phylogeny
Pagès, Marie ULg; Calvignac, Sébastien; Klein, Catherine et al

Poster (2007, August)

To definitively solve the last the ambiguities concerning the evolutionary history of Ursidae, we sequenced ten nuclear genes for all the eight extant bear species. By combining these new sequences with ... [more ▼]

To definitively solve the last the ambiguities concerning the evolutionary history of Ursidae, we sequenced ten nuclear genes for all the eight extant bear species. By combining these new sequences with those of four other recently published nuclear markers, we provide new insights into the phylogenetic relationships of the Ursidae family members. The hypothesis that the giant panda was the first species to diverge among ursids is definitively confirmed and the branching order within the Ursus genus is clarified for the first time. Moreover, these analyses indicate that the American and the Asiatic black bears do not cluster as sister taxa, as had been previously hypothesised. Sun and sloth bears undoubtedly appear as the most basal ursine species but uncertainties about their exact relationships remain. [less ▲]

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See detailGenesis of intermediate to silicic igneous rocks at the end of the Sveconorwegian (grenvillian) orogeny
Vander Auwera, Jacqueline ULg; Bogaerts, M.; Bolle, Olivier ULg

in Geochimica et Cosmochimica Acta (2007, August), 71(15S), 1054

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See detailQuantitative onvergence analysis of multi-agent systems
tuna, S. E.; Sepulchre, Rodolphe ULg

in Proceedings of the 7th IFAC Symposium on Nonlinear Control Systems (2007, August)

We introduce a characterization of contraction for bounded convex sets. For discrete-time multi-agent systems we provide an explicit upperbound on the rate of convergence to a consensus under the ... [more ▼]

We introduce a characterization of contraction for bounded convex sets. For discrete-time multi-agent systems we provide an explicit upperbound on the rate of convergence to a consensus under the assumptions of contractiveness and (weak) connectedness (across an interval). Convergence is shown to be exponential when either the system of the function characterizing the contraction is linear [less ▲]

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See detailSignificance of soluble HLA-G detection in follicular fluids and embryo supernatants in IVF/ICSI cycles
Lédée, Nathalie ULg; Thonon, Fabienne ULg; PERRIER d'HAUTERIVE, Sophie ULg et al

in Journal of Reproductive Immunology (2007, August), 75(1), 11

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See detailFrequency effects of morphological units in derived and pseudoderived words in French dyslexics
Quemart, Pauline ULg; Casalis, Séverine

Poster (2007, August)

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See detailPublic spaces in a fragmented city : the case of Beirut suburbs
Farah, Jihad ULg

Conference (2007, August)

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See detailStudy of contribution of signalling pathways Notch, Wnt, Shh and BMP in mesenchymal stem cell prohaematopoietic activity
Briquet, Alexandra ULg; Dolhet, Marie; Demeuse, Jessica et al

in Acta Clinica Belgica (2007, August), 62(4), 256

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See detailAsteroseismology of beta Cephei stars: effects of the chemical composition
Thoul, Anne ULg

Conference (2007, August)

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See detailQualitative—not Quantitative—Deliberative Polling ?
Reuchamps, Min ULg

Conference (2007, July 30)

The last twenty years have seen the emergence of a new generation of polls: the deliberative polls. Unlike usual polling, deliberative polling—first suggested by Fishkin and Luskin—emphasizes not only the ... [more ▼]

The last twenty years have seen the emergence of a new generation of polls: the deliberative polls. Unlike usual polling, deliberative polling—first suggested by Fishkin and Luskin—emphasizes not only the representation of polling but also the deliberation. The deliberative poll attempts to represent all in a given population, through a statistical microcosm empowered to think about the issues in question under favorable conditions—the sample population takes a questionnaire, then is informed through a learning process that alternates discussions in small groups and with experts and politicians, and eventually re-takes the same questionnaire. Although—quantitative—deliberative polling catches the big picture—what people think before and after and how their opinions vary, it hardly gives any insight on why the citizens change their opinions and, above all, what it means after the learning process. This question is especially important in topics where little change of opinions may be expected such as political preferences and identities. Specifically, the qualitative deliberative polling is used to explore the relationship between the citizens’ perception (understood as knowledge, legitimacy, identity, and perception of the others) of the federal government in both Belgium and Canada and their federal preferences vis-à-vis the evolution of the regime. Conducting qualitative and quantitative deliberative polling in those cases seem to offer the best result since the quantitative aspect provides a general picture of the change of opinions while the qualitative aspect endeavors to understand the change of opinions. Qualitative deliberative polling relies on a systematic qualitative content analysis of the focus groups’ discussions and interaction between the participants and the experts. To combine qualitative methods with—quantitative—deliberative polling has the potential to provide a finer picture of the citizens’ opinions on a broad variety of topics and issues. [less ▲]

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See detailNumerical tools for assessing reservoir sedimentation and sediment management
Dewals, Benjamin ULg

Conference (2007, July 27)

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See detailStainless steel beam-columns in case of fire
Lopes, Nuno; Vila Real, Paulo; Da Silva, Luis et al

in Beale, R. G. (Ed.) proceedings of the 6th International Conference on Steel and Aluminium Structures ICSAS'07 (2007, July 25)

Eurocode 3 states that stainless steel structural members, subjected to high temperatures, must be designed with the same expressions used on carbon steel members. However, as these two materials have ... [more ▼]

Eurocode 3 states that stainless steel structural members, subjected to high temperatures, must be designed with the same expressions used on carbon steel members. However, as these two materials have different constitutive laws, it should be expected that different formulae for the calculation of member stability should be used for room temperature design. In a recent work, the authors have proposed a more accurate procedure for the evaluation of the fire resistance of stainless steel columns which necessarily affects the beam-column design formulae. This work presents a numerical study of the behaviour of stainless steel beam-columns subjected to fire. [less ▲]

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See detailStainless steel beam-columns in case of fire
Lopes, Nuno; Vila Real, Paulo; Da Silva, Luis et al

Conference (2007, July 25)

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See detailExperimental investigations on the behaviour of a composite frame after the loss of a column
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Beale, R. G. (Ed.) Proceeding of the 6th International Conference on Steel and Aluminium Structures (2007, July 24)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional loading, i.e. other accidental loads than ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional loading, i.e. other accidental loads than those already taken into consideration in the design process. According to Eurocodes and some other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most of the cases, no precise practical guidelines on how to achieve this goal are provided. Even basic requirements to fulfil are generally not clearly expressed. An European RFCS project called “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines allowing to ensure the structural integrity of steel and composite structures under exceptional loading through an appropriate robustness. This project involves analytical, numerical and experimental investigations; in particular, one substructure test simulating the loss of a column in a composite building, because of an unexpected impact, was performed in September 2006 at the University of Liège. This paper describes the experimental test carried out at the University of Liège, as part of this European project, and the first interpretation of the results. [less ▲]

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See detailRandom Subwindows and Randomized Trees for Image Retrieval, Classification, and Annotation
Marée, Raphaël ULg; Dumont, Marie; Geurts, Pierre ULg et al

Poster (2007, July 22)

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See detailWater desorption isotherms of resorcinol-formaldehyde and carbon xerogels
Léonard, Angélique ULg; Escalona, I.; Job, Nathalie ULg et al

Poster (2007, July 15)

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See detailEvidence of food quality limitation in benthic river insects
Darchambeau, François ULg; Glémet, Hélène; Bélanger, Tommy et al

Conference (2007, July 12)

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See detailLateral-torsional Buckling of Ferritic Stainless Steel Beams in Case of Fire
Lopes, Nuno; Vila Real, Paulo; Da Silva, Luis et al

in Proceedings of the first International Conference on the Art of Resisting Extreme Natural Forces (2007, July 12)

This work presents a numerical study of the behaviour of ferritic stainless steel Ibeams subjected to lateral-torsional buckling and compares the obtained results with the beam design curves of Eurocode 3 ... [more ▼]

This work presents a numerical study of the behaviour of ferritic stainless steel Ibeams subjected to lateral-torsional buckling and compares the obtained results with the beam design curves of Eurocode 3. New formulae, for the lateraltorsional buckling, that approximate better the real behaviour of ferritic stainless steel structural elements in case of fire are proposed. These new formulae were based on numerical simulations using the program SAFIR, which was modified to take into account the material properties of the stainless steel. [less ▲]

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See detailAdvances in cobalt mediated radical polymerization (CMRP) of vinyl monomers
Debuigne, Antoine ULg; Detrembleur, Christophe ULg; Bryaskova, Rayna et al

Conference (2007, July 11)

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See detailAssessment of the NeQuick Model at Mid-latitudes using GPS TEC and Ionosonde Data
Bidaine, Benoît ULg; Warnant, René ULg

Conference (2007, July 11)

The ionosphere plays a crucial role in GNSS accuracy. In extreme cases, this electrically charged part of the atmosphere can lead to errors in positioning exceeding 100m. At first approximation, the ... [more ▼]

The ionosphere plays a crucial role in GNSS accuracy. In extreme cases, this electrically charged part of the atmosphere can lead to errors in positioning exceeding 100m. At first approximation, the ionospheric effect depends on the frequency of the incident signal and on the total content in free electrons of the ionosphere (“total electron content”, TEC) which is the integral of the electron density on the path between the satellite and the receiver. The modelling of this parameter reveals then itself to be critical in particular for single-frequency receivers, the most common ones constituting the mass market, but also for multiple-frequency devices which will comprise a fallback mode in single frequency within the framework of critical applications such as civil aviation where the level of precision must be guaranteed in all circumstances. The NeQuick model, which has been chosen for correcting the ionospheric error contribution in GALILEO single frequency users, calculates the electron density at a given point of the ionosphere according to the time conditions and the solar activity. This electron density can be integrated along the path from the receiver to the considered satellite to provide the TEC. The NeQuick model depends on a parameter Az (“effective ionization level”) which will be daily updated by the GALILEO ground stations to give the solar activity information to the model. In order to reach the ionosphere error correction level objective (70% or 20 TECu whichever is larger), the model itself as well as its use for GALILEO are investigated. Different situations have to be considered: different latitude regions (space conditions), different hours, seasons and years (time conditions) and specific phenomena appearance (magnetic storms, Travelling Ionospheric Disturbances – TIDs). In addition the results can be compared to different data sets among which GPS slant or vertical TEC measurements, Global Ionospheric Maps, ionosonde profiles, topside soundings but also other ionosphere models results such as IRI. As a first step in a thorough comparison process, we take benefit of various ionosphere data from the Dourbes Observatory (Belgium) where ionosonde and GPS TEC data are available on a period of more than one solar cycle, to study the mid-latitudes. We first investigate the difference between GPS-derived vTEC for Dourbes station and vTEC values from NeQuick for the latest years (between solar maximum in 2000 and minimum in 2006) in order to observe the temporal dependencies towards Universal Time, season and solar activity. The paper analyses the different situations when NeQuick fails to represent TEC in an adequate way to provide an efficient correction for navigation. Ionosonde measurements will help in the interpretation of these situations. [less ▲]

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See detailStatistical study of ionospheric small-scale irregularities at mid-latitudes using GPS measurements
Wautelet, Gilles ULg; Warnant, René ULg

Conference (2007, July 11)

At the present time, Global Navigation Satellite Systems (GNSS) allow to obtain a precision of a few centimeters in real time using positioning techniques like the so-called Real Time Kinematics (RTK ... [more ▼]

At the present time, Global Navigation Satellite Systems (GNSS) allow to obtain a precision of a few centimeters in real time using positioning techniques like the so-called Real Time Kinematics (RTK). Nowadays, the ionosphere remains the most important error source affecting such GNSS applications. Indeed, the presence of small-scale irregular structures in the Total Electron Content (TEC) can strongly affect the reliability and the precision of high precision real time positioning applications. Those small-scale structures can have several origins: Traveling Ionospheric Disturbances, "noise-like" variability in TEC, scintillations. The Royal Meteorological Institute of Belgium (RMI) has developed a software which allows to monitor the TEC using GPS measurements (at one station). The software can also be used to detect small-scale irregularities in TEC by monitoring TEC temporal gradients (i.e. rate of change). The RMI has applied this software to the GPS data collected at Brussels from April 1993 up to now what represents a period of more than a Solar Cycle. The results obtained from this GPS-TEC software will be presented. First, the paper analyzes the different types of small-scale structures which have been observed in TEC. Then, a statistical study of those ionospheric irregularities is presented; we shall analyze their probability of occurrence and their amplitude (in TECU/min) depending on daytime, season, solar activity, geomagnetic activity... The results of our study which is financed by the GNSS Supervising Authority will allow to have a better understanding of the usual case/worst case conditions encountered in high precision positioning applications based on GNSS. [less ▲]

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See detailPlankton ecology of Lake Kivu and the consequences of a planktivore introduction
Descy, Jean-Pierre; Sarmento, Hugo; Isumbisho, Mwapu et al

Conference (2007, July 09)

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See detailBiogeochemistry of a late coccolithophorid bloom at the continental margin of the Bay of Biscay
Harlay, Jérôme ULg; De Bodt, Caroline; d'Hoop, Quentin et al

Poster (2007, July 02)

Recent findings have led to growing concern regarding the impact of ocean acidification on marine calcifyers, but little is known about their biogeochemistry in natural (field) conditions (a major but ... [more ▼]

Recent findings have led to growing concern regarding the impact of ocean acidification on marine calcifyers, but little is known about their biogeochemistry in natural (field) conditions (a major but overlooked pre-requisite for realistic modelling of the future evolution of marine C cycling in a high CO2 world). The changes that will undergo these species in the near future and the biological feedback to decreasing oceanic pH are still open to debate. Coccolithophores, among which Emiliania huxleyi (Ehux) is the most abundant and widespread species, are the dominant calcifying phytoplankton in the subpolar and temperate zones of the worlds oceans. Within the framework of the Climate and Atmosphere Belgian Federal Science Policy Office programme, the continental margin of the Northern Bay of Biscay (North Atlantic Ocean) was visited in June 2006 during a transdisciplinary investigation of a late-spring bloom dominated by Ehux. Remote sensing images, transmitted onboard on a daily basis, were of valuable significance to pinpoint the coccolithophorid bloom along the margin, and to sample stations with contrasted biogeochemical properties.We determined 14C-based primary production and calcification rates, as well as pelagic respiration rates (O2 incubations). The magnitude of the biological and carbonate carbon fluxes will be synthesized and discussed in the light of biogeochemical parameters, such as Transparent Exopolymer Particles (TEP), chlorophyll-a, particulate carbon concentrations, particle dynamics and particulate organic carbon export (deduced from 234Th fluxes). Additional information on the bloom biogeochemistry will be presented (activity of dissolved esterase enzymes and bacterial community structure) to emphasize the importance of coccolithophorid blooms in the contemporary carbon cycle. [less ▲]

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See detailDECPHOT: An Optimal Deconvolution-based Photometric Reduction Method
Gillon, Michaël ULg; Magain, Pierre ULg; Chantry, Virginie ULg et al

in Transiting Extrapolar Planets Workshop (2007, July 01)

A high accuracy photometric reduction method is needed to take full advantage of the potential of the transit method for the detection and characterization of exoplanets, especially in deep crowded fields ... [more ▼]

A high accuracy photometric reduction method is needed to take full advantage of the potential of the transit method for the detection and characterization of exoplanets, especially in deep crowded fields. In this context, we present DECPHOT, a new deconvolution-based photometry algorithm able to deal with a very high level of crowding and large variations of seeing. It also increases the resolution of astronomical images, an important advantage for the discrimination of false positives in transit photometry. [less ▲]

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See detailOn the Influence of Blends on the Potential of Ground-based Transit Surveys
Gillon, Michaël ULg; Magain, Pierre ULg

in Afonso, C.; Weldrake, D.; Henning, T. (Eds.) Transiting Extrapolar Planets Workshop (2007, July 01)

Transit surveys have to observe many stars all at once in order to compensate for the rarity of the searched events. Such surveys, especially the ones observing a deep field of view and/or broadening ... [more ▼]

Transit surveys have to observe many stars all at once in order to compensate for the rarity of the searched events. Such surveys, especially the ones observing a deep field of view and/or broadening their stellar images, have to deal with a relatively high level of crowding. This crowding could lead to a reduction of the number of detectable transits, and the estimation of the potential of such surveys without taking into account the influence of blends could give overoptimistic results. We have developed a code which allows to estimate the extent by which such a survey is affected by the crowding of the field of view. Our results show that the influence of blends is important only for severe levels of crowding and is in general much less crucial than the influence of red noise. [less ▲]

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See detailSeismic study of the Alpha Centauri binary system using the minimisation algorithm of Levenberg-Marquarth
Ozel, N.; Dupret, Marc-Antoine ULg; Baglin, A.

in SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July 2-6, 2007, Eds.: J. Bouvier, A. Chalabaev, and C. Charbonnel, p.545 (2007, July 01)

Thanks to the CoRoT mission, we are going to get seismic data of very high precision for many stars. Throughout the method of asteroseismology these data will allow us to constrain the physical ... [more ▼]

Thanks to the CoRoT mission, we are going to get seismic data of very high precision for many stars. Throughout the method of asteroseismology these data will allow us to constrain the physical description of stellar interiors with unprecedented precision. In this context, we have developed a general tool which allows us to find stellar models fitting a set of seismic constraints (the oscillations frequencies) and non-seismic constraints (e.g. the luminosity, the effective temperature, ...). This tool follows the algorithm of Levenberg-Marquarth which seeks the fundamental parameters of the stellar model (e.g. the mass, the age, the helium abundance, the mixing-length parameter,ldots). We apply it to a specific case: the alpha Cen binary system. Taking into account all observational constraints available for this binary system, we succeed to find models entering between the one or two sigma error box of the observational constraints. [less ▲]

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See detailFirst Results from SuperWASP
Street, R. A.; Collier Cameron, A.; Maxted, P. et al

in Transiting Extrapolar Planets Workshop (2007, July 01)

We present a summary of the first results from the SuperWASP survey, including the detection of two new transiting exoplanets. We summarize our candidate selection procedure and the process by which we ... [more ▼]

We present a summary of the first results from the SuperWASP survey, including the detection of two new transiting exoplanets. We summarize our candidate selection procedure and the process by which we eliminated many false positives prior to radial velocity observations carried out with the Sophie spectrograph at the Observatoire de Haute-Provence. These data confirmed the discovery of two new transiting hot Jupiters, while rejecting 23 other targets. The two confirmed planets, WASP-1b & WASP-2b, respectively orbit F7V and K1V host stars with periods of 2.52 days and 2.15 days. The mass of WASP-1b is constrained to the range 0.80-0.98 M_{Jup} and the planet appears to be `bloated' with a radius of at least 1.33 R_{Jup}. WASP-2b has a mass between 0.81-0.95 M_{Jup} and a radius in the range 0.65-1.26 R_{Jup}. [less ▲]

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See detailSmall Scale Structure in the ISM towards IC 2391 and NGC 6475
Smoker, J. V.; Hunter, I.; Keenan, F. P. et al

in Haverkorn, M.; Goss, M. (Eds.) SINS - Small Ionized and Neutral Structures in the Diffuse Interstellar Medium (2007, July 01)

We describe UVES spectroscopic observations towards early-type stars located in the nearby open clusters IC 2391 (D=175 pc) and NGC 6475/M 7 (D=301 pc), with resolution ˜80,000 and S/N ratio per pixel of ... [more ▼]

We describe UVES spectroscopic observations towards early-type stars located in the nearby open clusters IC 2391 (D=175 pc) and NGC 6475/M 7 (D=301 pc), with resolution ˜80,000 and S/N ratio per pixel of ˜140 to ˜360. The aim is to investigate the small-scale structure variations within parts of the local ISM and determine how they are dependent on element and ionisation stage observed, thus providing information on cloud parameters such as structure and sizes. The data used are taken from on-line versions of the Paranal Observatory Project (POP: http://www.eso.org/uvespop). A total of 25 early-type stars (A and B-type) are present in our sample towards IC 2391 with 23 towards NGC 6475/M 7, and enable us to probe differences in column densities on scales from ˜0.07--7.3-pc and ˜0.05---4.9-pc (in the respective clusters) for the optical transitions detected (Ti II (3383Å), Ca II (3933Å), Na I (5889, 5895Å) and K I (7698Å)). Towards NGC 6475 the Ca II column density is found to be constant to ˜0.15 dex over scales of ˜0.4--4-pc. A much greater scatter in the measurements for Na I D is observed with differences of up to ˜0.45 dex in sightlines separated by ˜4 pc. In the future work we will perform the same analysis for Ti II and K I towards both clusters. [less ▲]

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See detailIncidence of incisional complications after colic surgery.
Grulke, Sigrid ULg; Caudron, Isabelle; Verwilghen, Denis ULg et al

in Veterinary Surgery : The Official Journal of the American College of Veterinary Surgeons (2007, July)

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See detailThe effect of heterogeneity on the agreement between analytical and numerical solutions describing the recession flow in unconfined hillslope aquifers
Rocha, David; Feyen, Jan; Dassargues, Alain ULg

in Proceedings of the Int. Congress on Development, Environment and Natural Resources: Multi-level and multi-scale Sustainability (2007, July)

Analytical approximations or linearized versions of the Boussinesq equation, describing recession flow in unconfined hillslope aquifers have been applied extensively in the past. One of the major ... [more ▼]

Analytical approximations or linearized versions of the Boussinesq equation, describing recession flow in unconfined hillslope aquifers have been applied extensively in the past. One of the major assumptions in the conceptual formulation is isotropic homogeneity of the aquifer. Notwithstanding the effect of aquifer heterogeneity on recession flow has been pointed out [1], only recent studies are increasingly focusing on the quantification of this effect [2,3]. In the present research, the relevance of heterogeneity is being studied by analyzing the agreement between analytical approximations and the numerical solution of the receding flow in a layered unconfined aquifer with different domain configurations (horizontal, inclined and concave impervious bedrock). For the application of the analytical approximations use is made of the equivalent hydraulic conductivity concept. [less ▲]

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See detailReduced specificity of autobiographical memory and of personal projection in the future in alcoholics
Blairy, Sylvie ULg; Neumann, Aurore; Vanlofvelde, Cécile

Poster (2007, July)

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See detailMorphological decomposition in visual word recognition in French beginning readers
Quemart, Pauline ULg; Casalis, Séverine; Mathiot, Emmanuelle

Poster (2007, July)

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See detailA Generalization of Cobham's Theorem to Automata over Real Numbers
Boigelot, Bernard ULg; Brusten, Julien ULg

in Lecture Notes in Computer Science (2007, July), 4596

This paper studies the expressive power of finite-state automata recognizing sets of real numbers encoded positionally. It is known that the sets that are definable in the first-order additive theory of ... [more ▼]

This paper studies the expressive power of finite-state automata recognizing sets of real numbers encoded positionally. It is known that the sets that are definable in the first-order additive theory of real and integer variables (R, Z, +, <) can all be recognized by weak deterministic Büchi automata, regardless of the encoding base r > 1. In this paper, we prove the reciprocal property, i.e., that a subset of R that is recognizable by weak deterministic automata in every base r > 1 is necessarily definable in (R, Z, +, <). This result generalizes to real numbers the well-known Cobham's theorem on the finite-state recognizability of sets of integers. Our proof gives interesting insight into the internal structure of automata recognizing sets of real numbers, which may lead to efficient data structures for handling these sets. [less ▲]

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See detailCutting planes and infeasibility certificates from lattice-point-free polyhedra
Louveaux, Quentin ULg

Conference (2007, July)

A central result in the theory of integer optimization states that a system of linear diophantine equations Ax = b has no integral solution if and only if there exists a vector in the dual lattice, yT A ... [more ▼]

A central result in the theory of integer optimization states that a system of linear diophantine equations Ax = b has no integral solution if and only if there exists a vector in the dual lattice, yT A integral such that yT b is fractional. We extend this result to systems that both have equations and inequalities {Ax = b, C x ≤ d}. We show that a certificate of integral infeasibility is a linear system with rank(C) variables containing no integral point. The result also extends to the mixed integer setting. [less ▲]

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See detailNovel two stage real-time RT-PCR assay to detect and quantify huma and bovine noroviruses
Scipioni, Alexandra; Mauroy, Axel ULg; Ziant, Dominique et al

Poster (2007, July)

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See detailA Multihoming Architecture for OneLab
de la Oliva, Antonio,; Donnet, Benoît ULg; Parmentelat, Thierry, et al

in Real Overlays and Distributed Systems (2007, July)

This paper describes the work in progress in the European Commission funded OneLab project to extend PlanetLab nodes with multihoming functionalities. These multihoming functionalities aim at enabling ... [more ▼]

This paper describes the work in progress in the European Commission funded OneLab project to extend PlanetLab nodes with multihoming functionalities. These multihoming functionalities aim at enabling application developers, for example, to test the impact of multihoming solutions on their applications, or to find out appropriate parameters for multihoming solutions according to the requirements of their applications. [less ▲]

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See detailThe asteroseismic analysis of the pulsating sdB Feige 48 revisited
Van Grootel, Valérie ULg; Charpinet, Stéphane; Fontaine, Gilles et al

Conference (2007, July)

We present a new detailed analysis of the short period pulsating sdB star Feige 48, based on the same observations than in our previous work (Charpinet et al., 2005, A&A 443, 251) but with our new codes ... [more ▼]

We present a new detailed analysis of the short period pulsating sdB star Feige 48, based on the same observations than in our previous work (Charpinet et al., 2005, A&A 443, 251) but with our new codes including the rotation of the star. Feige 48 is supposed to be a relatively fast rotator, showing a fine structure in its pulsation spectrum about 28 µHz on three groups in the 9 frequencies. On the other side, Feige 48 belongs to a close binary system (likely with a white dwarf) where the orbital period is 9.02 +/- 0.03h (S. O'Toole 2004). With our new codes including the rotation (for a given rotation law, we calculate associated multiplets for each frequency with the perturbative approach on the first order), avoiding us to make assumptions about the m=0 modes, we were able to fit all the 9 periods together, leading to sligthly different estimations for the structural parameters of Feige 48 than in our previous work. Moreover, the rotation of the star is found to be solid with a period of 32,540s <=> 9.038h, very close to the orbital period of the system determined by spectroscopy, confirming the reasonable assumption that the system is tidally locked. In this context, it was possible to exclude that Feige 48 has a fast rotating core in term of much poorer merit functions. [less ▲]

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See detailPhytoremediation of contaminated sites in urban environment : preliminary results of a study focussed on Lubumbashi.
Colinet, Gilles ULg; Saad, Layla ULg; Cubaka, Alfred et al

Conference (2007, July)

A specific flora has developped in Central Africa on soils which are naturally rich in Cu and Co. Mining and ore treatment activities in the Katanga province (RDC) have generated contaminations which do ... [more ▼]

A specific flora has developped in Central Africa on soils which are naturally rich in Cu and Co. Mining and ore treatment activities in the Katanga province (RDC) have generated contaminations which do endanger ecosystem viability and/or human health. A survey of edaphic conditions prevailing for plant growing in natural metalliferous outcrops, the « copper hills », in mining sites (quarries), and in contaminated areas around metal smelters, is conducted as a first stage of a phytoremediation-based research program. Soluble, available and total content in some metallic trace elements have been measured. The first results show a relatively high heterogeneity inside and between sites. But the main finding is related to the very different nature of contamination between the three types of sites. This point constitutes an additionnal difficulty that should be taken into account for the selection of metallophytic species from the copper hills or the quarries in order to vegetalize a site contaminated by atmospheric fall outs from metal smelters in Lubumbashi. [less ▲]

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See detailLa formation des travailleurs sociaux face aux enjeux et contraintes de la société post-moderne
Faulx, Daniel ULg; Manfredini, Tiber ULg

in Quelles formations au métier du social pour quel travail social ? (2007, July)

Depuis une quinzaine d’années, les sociétés occidentales connaissent d’importants changements du point de vue économique, social et idéologique ; jusqu’à modifier les comportements mêmes des individus ... [more ▼]

Depuis une quinzaine d’années, les sociétés occidentales connaissent d’importants changements du point de vue économique, social et idéologique ; jusqu’à modifier les comportements mêmes des individus, leur rapport aux autres, au temps, à l’espace, au métier, à l’activité et finalement à l’existence sociale. Or, les bases fondamentales des dispositifs de formation en groupe, spécifiquement ceux qui sont destinés aux travailleurs sociaux, sont issues pour bonne partie du modèle de l’éducation permanente et des postulats de l’action socio-culturelle, deux courants qui se sont développés dans un contexte économique, social et idéologique assez différent de celui que nous connaissons aujourd’hui. A partir de ce constat, l’hypothèse de départ de notre réflexion est que ces dispositifs sont appelés à se remettre en question face à ces évolutions. Comment conserver les atouts du modèle formatif tout en l’adaptant aux réalités actuelles ? C’est autour de cette question principale que nous avons construit notre contribution. Après avoir commenté ces changements, nous proposons plusieurs dispositifs de formation que nous avons mis en place à cet effet. Prendre en compte les changements économiques, idéologiques, « managériaux » et professionnels (qu’il s’agisse des participants ou de la profession de formateur elle-même) qui marquent notre environnement de formation nous paraît constituer un défi fondamental pour les formateurs d’adultes, notamment dans le secteur non marchand. En partageant notre expérience de formateurs dans le cadre de ce colloque, notre objectif est d’ouvrir une réflexion sur les manières de conserver la richesse de l’approche issue de l’éducation permanente tout en intégrant une réflexion méthodologique qui tient compte de ces changements qui modifient profondément le rapport des organisations et des individus à la formation. [less ▲]

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See detailComputation and evaluation of wall shear stress distribution at the lower surface of a radial flow cell.
Detry, Jean; Jensen, B.; Deroanne, Claude et al

in ECI International Conferences : Heat Exchanger Fouling and Cleaning VII (2007, July)

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See detailModeling of 3-D losses and deviations in a throughflow analysis tool
Simon, Jean-Francois; Nicks, Alain; Paris, Nicolas et al

in Proceedings of the 8th International Symposium for Experimental and Computational Aerothermodynamics of Internal Flow (2007, July)

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See detailEmergency Voltage Stability Controls: an Overview
Van Cutsem, Thierry ULg; Vournas, Costas

(2007, July)

This paper provides an overview of emergency voltage stability controls in power systems. First, a brief review is made of voltage instability mechanisms, countermeasures, and system protection schemes ... [more ▼]

This paper provides an overview of emergency voltage stability controls in power systems. First, a brief review is made of voltage instability mechanisms, countermeasures, and system protection schemes. Next, the paper discusses various aspects of emergency controls, including generator voltage control, load tap changer modified control and load shedding, pointing out some important features and addressing research aspects. Load shedding is considered in some more detail, and applications to two real systems of, respectively, a response-based and an event-based load shedding scheme, are described. [less ▲]

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See detailCreative Industries, governmentalities and heterotopias: the case of local government in France
Froehlicher, Thomas ULg; Guillemin, Arnaud; Apangu, Patricia

Conference (2007, July)

Creative industries, since 1997, have become assets for economic and cultural development. Nations around the world, at different political levels, are now focusing on the development of a creative ... [more ▼]

Creative industries, since 1997, have become assets for economic and cultural development. Nations around the world, at different political levels, are now focusing on the development of a creative industries policy. The success of this concept can be linked to the fact that this meta-sector has one of the highest levels of economic growth in these last years. Despite the growing number of studies on creative industries, the rationale behind the implementation of this type of policy remains unclear. We seek to further understand how and why local governments are participating in creative industries and how it is spatially acted, by using the concepts of governmentality and heterotopias, as defined by Foucault (1991a, 1997), to explore the rationality and the dynamics behind this policy. Our study focuses on the case of the “Grand Lyon” and its economic development agency. In early 2006, Lyon decided to launch a creative industries policy focused on its two existing creative clusters linked to fashion and video games, Lyon Vision Mode and Lyon Game respectively. A transversal approach was taken to include various and often unconnected sectors. Lyon is the third largest French city with a strong industrial economy. The city has the ambition to be in the top fifteen of the creative regions in Europe. Our results demonstrate that, first of all, the practices of creative industries highlight the different types of technologies that were expressing the rationality and mentality of the ‘governors’. We also found that the policy deployed by the local government created two types of heterotopias (Foucault, 1997). These separate and different spaces appeared as places for creativity in the development and implementation of the creative industries strategy. These heterotopias help to build a sense of community among the participants, and create a tribe, clan, or as defined by Florida (2002), a class. [less ▲]

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See detailThrombin activity profile : a powerful ex vivo screening test for the development of anticoagulant drugs
Robert, S.; Ghiotto, J.; Pirotte, Bernard ULg et al

Poster (2007, July)

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See detailWater desorption isotherms of resorcinol-formaldehyde and carbon xerogels
Léonard, Angélique ULg; Escalona, Ivonne; Job, Nathalie ULg et al

in The American Carbon Society (Ed.) Proceedings of Carbon 2007 (2007, July)

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See detailApplication of the Galileo system for a better synchronization of electrical power systems
Mack, Philippe; Capitanescu, Florin ULg; Glavic, Mevludin et al

(2007, July)

In this paper we present objectives and strategies of the NAVELEC research project funded by the European Union Galileo Joint Undertaking (GJU/05/2423). The project objective is to assess how the European ... [more ▼]

In this paper we present objectives and strategies of the NAVELEC research project funded by the European Union Galileo Joint Undertaking (GJU/05/2423). The project objective is to assess how the European Global Navigation Satellite System related solutions can enhance the operation and control of the European power system over wide areas. Some basic functionalities of the GALILEO system are given first, then we summarize the questionnaire, set at the initial stage of the project, and provide the analysis of received responses from transmission system operators. Two generic strategies to upgrade existing electrical power transmission networks with functionalities, as well as major steps to upgrade underlying infrastructures, are discussed in this paper. [less ▲]

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See detailAssessment of Lake Sediment Sensitivity to Earthquakes and Climate Cycles along the North Anatolian Fault,
Boes, Xavier; Avsar, Ulas; Doner, L. et al

Conference (2007, July)

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See detailSpatial aggregation of low resolution satellite data for the monitoring of vegetation response to climatic stresses : analysis of the spatial heterogeneity of aggregated entities.
Horion, Stéphanie; Eerens, H.; Tychon, Bernard ULg et al

in Proceedings Envisat Symposium (2007, July)

Our PhD research consists in analysing and modelling the vegetation response or sensitivity to climatic stresses with low satellite imagery. In that framework, the selection of optimal calibration sites ... [more ▼]

Our PhD research consists in analysing and modelling the vegetation response or sensitivity to climatic stresses with low satellite imagery. In that framework, the selection of optimal calibration sites is very important. These sites should be characterised by a stable and homogenous land cover over large area. Here we analyse the spatial heterogeneity of the aggregation entities (EU-NUTS 2) used by the MARSFOOD programme for the extraction of regional NDVI-means. [less ▲]

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See detailTime-optimal control of a 3-level quantum system and its generalization to an n-level system
Chang, Dong Eui; Sepulchre, Rodolphe ULg

in Proceedings of the 26th American Control Conference (ACC 2007) (2007, July)

We solve the problem of steering a three-level quantum system from one eigen-state to another in minimum time and study its possible extension to the time-optimal control problem for a general n-level ... [more ▼]

We solve the problem of steering a three-level quantum system from one eigen-state to another in minimum time and study its possible extension to the time-optimal control problem for a general n-level quantum system. For the threelevel system we find all optimal controls by finding two types of symmetry in the problem: Z2 × S3 discrete symmetry and S1 continuous symmetry, and exploiting them to solve the problem through discrete reduction and symplectic reduction. We then study the geometry, in the same framework, which occurs in the time-optimal control of a general n-level quantum system. [less ▲]

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See detailCromakalim analogues as pancreatic β-cell-selective KATP channel openers
Florence, X.; De Tullio, Pascal ULg; Lebrun, P. et al

Poster (2007, July)

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See detailIgf2 expression is required for complete immunological tolerance to insulin
Hansenne, Isabelle; Renard, Chantal; Geenen, Vincent ULg

Poster (2007, July)

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See detailPositive effects of strontium ranelate on spine osteoarthritis progression
Bruyère, Olivier ULg; Delferriere, D.; Roux, C. et al

in Annals of the Rheumatic Diseases (2007, July), 66(Suppl.II), 58

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See detailStabilization Laws for Collective Motion in Three Dimensions
Scardovi, Luca; Sepulchre, Rodolphe ULg; Leonard, Naomi

in Proceedings of the European Control Conference (2007, July)

This paper proposes a framework for the design of control laws that stabilize relative equilibria in a model of identical, steered particles moving in three-dimensional Euclidean space. Under the ... [more ▼]

This paper proposes a framework for the design of control laws that stabilize relative equilibria in a model of identical, steered particles moving in three-dimensional Euclidean space. Under the assumption of all-to-all communication, the derived control laws only require relative orientations and positions. We extend the obtained results in the presence of limited communication topologies by equipping each agent with a consensus estimator. [less ▲]

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See detailFirst steps to model milk urea in a management perspective
Bastin, Catherine ULg; Gillon, Alain ULg; Laloux, Laurent et al

Conference (2007, July)

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See detailCOST 296 Working Group 3 “Space-based systems” activities and results
Warnant, René ULg

Conference (2007, July)

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See detailRe-evaporation of adsorbed (toxic) compounds inside an activated carbon filter
Léonard, Angélique ULg; Blacher, Silvia ULg; Wullens, Hilda et al

in The American Carbon Society (Ed.) Proceedings of Carbon 2007 (2007, July)

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See detailDevelopment and pre-validation of a high sensitive method for the determination of levonorgestrel in human plasma by SPE/LC/MS-MS
Hubert, Cédric ULg; streel, Bruno; Sibenaler, Renilde et al

Poster (2007, July)

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See detailControl of phase shifting transformers by multiple transmission system operators
Marinakis, Adamantios ULg; Glavic, Mevludin; Van Cutsem, Thierry ULg

(2007, July)

A general framework is proposed for the control of phase shifting transformers owned by several TSOs, taking into account their interactions. The proposed solution is the Nash equilibrium of a sequence of ... [more ▼]

A general framework is proposed for the control of phase shifting transformers owned by several TSOs, taking into account their interactions. The proposed solution is the Nash equilibrium of a sequence of optimizations performed by the various TSOs, each of them taking into account the other TSOs’ control settings as well as operating constraints relative to the whole system. The method is applied to a linearized network model and illustrated on the IEEE 118-bus system. [less ▲]

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See detailEmergency alleviation of thermal overloads using model predictive control
Otomega, Bogdan; Marinakis, Adamantios ULg; Glavic, Mevludin et al

(2007, July)

An approach inspired of Model Predictive Control is proposed to determine a sequence of control actions aimed at alleviating thermal overloads in emergency conditions. The algorithm brings the line ... [more ▼]

An approach inspired of Model Predictive Control is proposed to determine a sequence of control actions aimed at alleviating thermal overloads in emergency conditions. The algorithm brings the line currents below their limits in the time interval left by protections, while accounting for constraints on control changes at each step. Its closed-loop nature allows to compensate for measurement noise and model uncertainties. [less ▲]

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See detailFate of zinc in a sandy Luvisol submitted to 100 years of massive irrigation with raw waste waters: a multi-scale approach
Dere, Christelle ULg; Lamy, Isabelle; Cornu, Sophie

Conference (2007, July)

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See detailEmotional facial expression decoding in children high in social anxiety
Blairy, Sylvie ULg; Massin, Anne

Poster (2007, July)

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See detailMeasurement of the partial pressure of CO2 in bulk sea ice
Geilfus, Nicolas-Xavier ULg; Verbeke, Véronique; Delille, Bruno ULg et al

Poster (2007, July)

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See detailUsing survey data to resolve the exchange risk exposure puzzle
Muller, Aline ULg; Jongen, Ron; Verschoor, Willem

Conference (2007, June 30)

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See detailHigh-Order Discrete Geometrical Models
Geuzaine, Christophe ULg

in Henrotte, F. (Ed.) Proceedings of the 3rd Advanced Computational Electromagnetics workshop (2007, June 29)

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See detailOffice Markets and Urban Mutations in Belgium
Halleux, Jean-Marie ULg

Conference (2007, June 29)

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See detailCompte-rendu des travaux de l'atelier thématique "Scale, Time and Space"
Van Ruymbeke, Muriel ULg

Conference (2007, June 29)

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See detailEmpty housing and disurbanisation in Wallonia
Halleux, Jean-Marie ULg

Conference (2007, June 28)

Detailed reference viewed: 47 (1 ULg)
See detailKey roles for metal transport proteins in naturally selected Zn/Cd hyperaccumulation and tolerance in A. halleri
Talke, Ina N.; Hanikenne, Marc ULg; Ertych, N. et al

Poster (2007, June 26)

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See detailScheduling Data-Intensive Bags of Tasks in P2P Grids with BitTorrent-enabled Data Distribution
Briquet, Cyril ULg; Dalem, Xavier ULg; Jodogne, Sébastien ULg et al

in Fortino, Giancarlo; Mastroianni, Carlo; Pierre, Guillaume (Eds.) Proceedings of the Second Workshop on Use of P2P, GRID and Agents for the Development of Content Networks (2007, June 26)

Scheduling Data-Intensive Bags of Tasks in P2P Grids leads to transfers of large input data files, which cause delays in completion times. We propose to combine several existing technologies and patterns ... [more ▼]

Scheduling Data-Intensive Bags of Tasks in P2P Grids leads to transfers of large input data files, which cause delays in completion times. We propose to combine several existing technologies and patterns to perform efficient data-aware scheduling: (1) use of the BitTorrent P2P file sharing protocol to transfer data, (2) data caching on computational Resources, (3) use of a data-aware Resource selection scheduling algorithm similar to Storage Affinity, (4) a new Task selection scheduling algorithm (Temporal Tasks Grouping), based on the temporally grouped scheduling of Tasks sharing input data files. Data replication is also discussed. The proposed approach does not need an overlay network or Predictive Communications Ordering, making our operational implementation of a P2P Grid middleware easily deployable in unstructured P2P networks. Experiments show that performance gains are achieved by combining BitTorrent, caching, Storage Affinity and Temporal Tasks Grouping. This work can be summarized as combining P2P Grid computing and P2P data transfer technologies. [less ▲]

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See detailEvidence of upward filed-aligned currents at the open-closed field line boundary in Saturn's noon magnetosphere: observations and theory
Bunce, E. J.; Cowley, S. W. H.; Talboys, D. L. et al

Conference (2007, June 26)

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See detailExploration of the neuronal substrates of Directed Forgetting with fMRI.
Feyers, Dorothée ULg; Hogge, Michaël; Salmon, Eric ULg et al

Conference (2007, June 26)

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See detailCassini UVIS Observations of Saturn's Auroras
Pryor, W. J.; Ajello, J. M.; Gustin, Jacques ULg et al

Conference (2007, June 25)

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See detailJupiter's changing auroral location
Grodent, Denis ULg; Bonfond, Bertrand ULg; Radioti, Aikaterini ULg et al

Conference (2007, June 25)

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See detailThe auroral footprint signatures of satellites on Jupiter
Gérard; Bonfond, Bertrand ULg; Grodent, Denis ULg

Conference (2007, June 25)

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See detailThe morphology of the X-ray emission above 2 keV from Jupiter's aurorae
Elsner, R. F.; Branduardi-Raymont, G.; Galand, M. et al

Conference (2007, June 25)

Detailed reference viewed: 10 (0 ULg)