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See detailCoupling a two-way nested primitive equation model and a statistical SST predictor of the Ligurian Sea via data assimilation
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Beckers, Jean-Marie ULg et al

in Ocean Modelling (2006), 13(3-4), 255-270

A primitive equation model and a statistical predictor are coupled by data assimilation in order to combine the strength of both approaches. In this work, the system of two-way nested models centred in ... [more ▼]

A primitive equation model and a statistical predictor are coupled by data assimilation in order to combine the strength of both approaches. In this work, the system of two-way nested models centred in the Ligurian Sea and the satellite-based ocean forecasting (SOFT) system predicting the sea surface temperature (SST) are used. The data assimilation scheme is a simplified reduced order Kalman filter based on a constant error space. The assimilation of predicted SST improves the forecast of the hydrodynamic model compared to the forecast obtained by assimilating past SST observations used by the statistical predictor. This study shows that the SST of the SOFT predictor can be used to correct atmospheric heat fluxes. Traditionally this is done by relaxing the model SST towards the climatological SST. Therefore, the assimilation of SOFT SST and climatological SST are also compared. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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See detailEndothelial cell-driven regulation of CD9 or motility-related protein-1 expression in multiple myeloma cells within the murine 5T33MM model and myeloma patients.
De Bruyne, Elke; Andersen, T. L.; De Raeve, Hendrik et al

in Leukemia : Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K (2006), 20(10), 1870-9

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See detailL'assiette des Belges en chiffres
Duquesne, Brigitte ULg

Poster (2006)

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See detailEvolution de la consommation alimentaire en Belgique et en Région wallonne
Duquesne, Brigitte ULg; Matendo, Sadrac; Lebailly, Philippe

Conference (2006)

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See detailSlip casting of barium zirconate aqueous concentrated suspensions
Boschini, Frédéric ULg; Guillaume, Bernard ULg; Rulmont, André ULg et al

in Journal of the European Ceramic Society (2006), 26(9), 1591-1598

The rheological behaviour of aqueous suspensions of barium zirconate was studied focusing on the effect of the Volume fraction of particles, leading to the determination of the maximum packing fraction ... [more ▼]

The rheological behaviour of aqueous suspensions of barium zirconate was studied focusing on the effect of the Volume fraction of particles, leading to the determination of the maximum packing fraction. Optimised suspensions dispersed with both polymethacrylic acid and tetramethylammonium hydroxide were slip cast on plaster Moulds to produce discs and crucibles, leading to relative green densities greater than 62% of theoretical ones. Densification was studied at temperatures ranging from 1450 to 1700 degrees C by static and dynamic sintering experiments. Scanning electron microscopy studies demonstrate that slip cast parts are dense and very homogeneous, without any significant processing-related defects or abnormal grain growth. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailPhylogeography of the Southeast Asian sundaicus complex inferred by differential evolution markers
Dusfour, Isabelle; Michaux, Johan ULg; Manguin, Sylvie

in American Journal of Tropical Medicine and Hygiene (The) (2006), 75(5), 590

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See detailEtude de l'appareil producteur de sons d'Ophidion barbatum
Fontenelle, Nicolas; Henrist, Catherine ULg; Cloots, Rudi ULg et al

Poster (2006)

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See detailProbing the existence of axions with the polarization of objects at cosmological distances
Hutsemekers, Damien ULg

Conference (2006)

Photon - axion conversion within a magnetic field over cosmological distances can affect the polarization of distant objects like quasars. We report the observation of large-scale alignments of quasar ... [more ▼]

Photon - axion conversion within a magnetic field over cosmological distances can affect the polarization of distant objects like quasars. We report the observation of large-scale alignments of quasar polarization vectors as well as a rotation of their polarization angles with distance. This effect might be due to the presence of axions along the line of sight. [less ▲]

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See detailAntimicrobial activity against gram negative bacilli from Yaounde Central Hospital, Cameroon
Gangoue Pieboji, Joseph ULg; Koulla-Shiro, S.; Ngassam, P. et al

in African Health Sciences (2006), 6(4), 232-5

BACKGROUND: Antimicrobial resistance among bacteria pathogens is a world-wide issue. The antimicrobial susceptibility patterns of common pathogenic bacteria are essential to guide empirical and pathogen ... [more ▼]

BACKGROUND: Antimicrobial resistance among bacteria pathogens is a world-wide issue. The antimicrobial susceptibility patterns of common pathogenic bacteria are essential to guide empirical and pathogen-specific therapy; unfortunately, these data are scarse in Cameroon. OBJECTIVE: To determine the antimicrobial susceptibility patterns of Gram-negative bacilli isolated in Yaounde Central Hospital Laboratory of Bacteriology. METHODS: Gram-negative bacilli isolates (n = 505), obtained from a wide range of clinical specimens (urine, pus and blood) in Yaounde Central Hospital Laboratory of Bacteriology between March 1995 and April 1998, were evaluated for resistance to antibiotics (amoxicillin, amoxicillin/clavulanate, piperacillin, cefazolin, cefoxitin, cefotaxime, ceftazidime, aztreonam, imipenem, gentamicin, tobramicin, ofloxacin and trimethoprim/sulfamethoxazole) by the Kirby-Bauer disk diffusion method. RESULTS: High rates of resistance were found in most of the bacteria studied. Resistance to all isolates was mostly observed for amoxicillin (87%), piperacillin (74%) and trimethoprim/sulfamethoxazole (73%). Susceptibilities to third generation cephalosporins (cefotaxime, ceftazidime) and monobactame (aztreonam) were = 91% for Escherichia coli, = 71% for Klebsiella spp., = 98% for Proteus mirabilis, = 50% for Enterobacter spp. and Citrobacter spp. Pseudomonas aeruginosa was less susceptible to cefotaxime (2%) and aztreonam (33%), and highly susceptible to ceftazidime (72%) whereas Acinetobacter baumannii was highly resistant to aztreonam (100%), to cefotaxime (96%) and cetazidime (62%). Imipenem (98%) was the most active antibiotic followed by the ofloxacine (88%). Susceptibility of all isolates to gentamicin was 67%. CONCLUSION: These results indicate that surveillance to antimicrobial resistance in Cameroon is necessary to monitor microbial trends, antimicrobial resistance pattern, and provide information for choosing empirical or direct therapy to physicians. [less ▲]

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See detailProposition pour l'édition des sources primaires CCFM
Mazziotta, Nicolas ULg

Conference (2006)

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See detailErard de La Marck, mécène et collectionneur (1472-1538)
Adam, Renaud ULg

in La vie des musées : bulletin de l'association francophone des musées de Belgique (2006), 20

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See detailJustinianus, Institutiones - Libri feudorum
Adam, Renaud ULg

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Filips de Schone (1478-1506) : schatten van de laatste hertog van Bourgondië : [tentoonstelling : Brussel, Koninklijke Bibliotheek van België, Nassaukapel, van 3 november 2006 tot 27 januari 2007] : catalogus (2006)

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See detailOn the use of Galerkin-Eckhaus method to study the nonlinear regime of Marangoni-Benard instabilities in an evaporating liquid layer
Margerit, Jonathan; Dondlinger, Mireille; Dauby, Pierre ULg

in European Physical Journal B -- Condensed Matter (2006), 54(4), 485-492

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See detailErasmus van Rotterdam, Gratulatorius panegyricus ad principem Philippum archiducem austriae
Adam, Renaud ULg

in Filips de Schone (1478-1506) : schatten van de laatste hertog van Bourgondië : [tentoonstelling : Brussel, Koninklijke Bibliotheek van België, Nassaukapel, van 3 november 2006 tot 27 januari 2007] : catalogus (2006)

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See detailDINEOF reconstruction of clouded images including error maps. Application to the Sea-Surface Temperature around Corsican Island
Beckers, Jean-Marie ULg; Barth, Alexander ULg; Alvera Azcarate, Aïda ULg

in Ocean Science (2006), 2

We present an extension to the Data INterpolating Empirical Orthogonal Functions (DINEOF) technique which allows not only to fill in clouded images but also to provide an estimation of the error ... [more ▼]

We present an extension to the Data INterpolating Empirical Orthogonal Functions (DINEOF) technique which allows not only to fill in clouded images but also to provide an estimation of the error covariance of the reconstruction. This additional information is obtained by an analogy with optimal interpolation. It is shown that the error fields can be obtained with a clever rearrangement of calculations at a cost comparable to that of the interpolation itself. The method is presented on the reconstruction of sea-surface temperature in the Ligurian Sea and around the Corsican Island (Mediterranean Sea), including the calculation of inter-annual variability of average surface values and their expected errors. The application shows that the error fields are not only able to reflect the data-coverage structure but also the covariances of the physical fields. [less ▲]

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See detailHobbes et la civilisation de l'imaginaire : actualité d'un geste critique
Herla, Anne ULg

in Cahiers Internationaux de Symbolisme (2006), 110-111-112

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See detailApplication of the X-FEM to the fracture of piezoelectric materials
Béchet, Eric ULg; Scherzer, Matthias; Kuna, Meinhard

Scientific conference (2006)

Materials exhibiting a strong piezoelectric effect may be used in many applications, where they serve as sensors, actuators or transducers. These applications range from for sub-millimeter length scales ... [more ▼]

Materials exhibiting a strong piezoelectric effect may be used in many applications, where they serve as sensors, actuators or transducers. These applications range from for sub-millimeter length scales in MEMs (Micro-Electro-Mechanical Systems) up to large scales in the the design of smart wings in the aerospace industry. As for regular materials subjected to high mechanical stresses, the knowledge of fracture behavior for these smart materials is often crucial within the design of parts under high electrical and mechanical loading. The Extended Finite Element Method [1] has been originally designed for crack growth analysis in isotropic elastic materials. In association with level-sets [2] as a mean for representing the crack geometry, it is a powerful way to get rid of the costly constrained remeshing needed with conventional techniques. Under certain circumstances, this method is also able to achieve regular convergence rates in the energy error even for a cracked domain [3]. Piezoelectric materials exhibit an transversely isotropic mechanical characteristic, as well as a coupling between mechanical and electrical variables. This leads to different near-crack tip mechanical fields and the presence of singularities in the electrical variables [4][5]. To treat this new problem in the X-FEM, specific crack analysis tools and changes in the enrichment functions are needed which allows to represent the crack- both in the mechanical and electrical functional spaces. In this work, we will present these techniques and perform a convergence analysis to ensure that the crack tip behavior is accurately taken into account. Finally, we suggest a simple propagation model for crack growth. [less ▲]

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See detailPeripheral blood B-cell death compensates for excessive proliferation in lymphoid tissues and maintains homeostasis in bovine leukemia virus-infected sheep.
Debacq, Christophe; Gillet, Nicolas ULg; Asquith, Becca et al

in Journal of Virology (2006), 80(19), 9710-9719

The size of a lymphocyte population is primarily determined by a dynamic equilibrium between cell proliferation and death. Hence, lymphocyte recirculation between the peripheral blood and lymphoid tissues ... [more ▼]

The size of a lymphocyte population is primarily determined by a dynamic equilibrium between cell proliferation and death. Hence, lymphocyte recirculation between the peripheral blood and lymphoid tissues is a key determinant in the maintenance of cell homeostasis. Insights into these mechanisms can be gathered from large-animal models, where lymphatic cannulation from individual lymph nodes is possible. In this study, we assessed in vivo lymphocyte trafficking in bovine leukemia virus (BLV)-infected sheep. With a carboxyfluorescein diacetate succinimidyl ester labeling technique, we demonstrate that the dynamics of lymphocyte recirculation is unaltered but that accelerated proliferation in the lymphoid tissues is compensated for by increased death in the peripheral blood cell population. Lymphocyte homeostasis is thus maintained by biphasic kinetics in two distinct tissues, emphasizing a very dynamic process during BLV infection. [less ▲]

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