Publications ORBi OA
Bookmark and Share    
Full Text
See detailBootstrap Equations for String-Like Amplitude
Semenov-Tyan-Shanskiy, Kirill ULg

in Dubinin, M.; Savrin, V. (Eds.) High energy physics and quantum field theory. Proceedings, 18th International Workshop, QFTHEP 2004, St. Petersburg, Russia, June 17-23, 2004 (2004)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailGlobal auroral conductance distribution due to electron and proton precipitation from IMAGE-FUV observations
Coumans, Valérie ULg; Gérard, Jean-Claude ULg; Hubert, Benoît ULg et al

in Annales Geophysicae [= ANGEO] (2004), 22(5), 1595-1611

The Far Ultraviolet (FUV) imaging system on board the IMAGE satellite provides a global view of the north auroral region in three spectral channels, including the SI 12 camera sensitive to Doppler shifted ... [more ▼]

The Far Ultraviolet (FUV) imaging system on board the IMAGE satellite provides a global view of the north auroral region in three spectral channels, including the SI 12 camera sensitive to Doppler shifted Lyman-alpha emission. FUV images are used to produce instantaneous maps of electron mean energy and energy fluxes for precipitated protons and electrons. We describe a method to calculate ionospheric Hall and Pedersen conductivities induced by auroral proton and electron ionization based on a model of interaction of auroral particles with the atmosphere. Different assumptions on the energy spectral distribution for electrons and protons are compared. Global maps of ionospheric conductances due to instantaneous observation of precipitating protons are calculated. The contribution of auroral protons in the total conductance induced by both types of auroral particles is also evaluated and the importance of proton precipitation is evaluated. This method is well adapted to analyze the time evolution of ionospheric conductances due to precipitating particles over the auroral region or in particular sectors. Results are illustrated with conductance maps of the north polar region obtained during four periods with different activity levels. It is found that the proton contribution to conductance is relatively higher during quiet periods than during substorms. The proton contribution is higher in the period before the onset and strongly decreases during the expansion phase of substorms. During a substorm which occurred on 28 April 2001, a region of strong proton precipitation is observed with SI 12 around 14:00MLT at similar to75degrees MLAT. Calculation of conductances in this sector shows that neglecting the protons contribution would produce a large error. We discuss possible effects of the proton precipitation on electron precipitation in aurora] arcs. The increase in the ionospheric conductivity, induced by a former proton precipitation can reduce the potential drop along field lines in the upward field-aligned currents by creating an opposite polarization electric field. This feedback mechanism possibly reduces the electron acceleration. [less ▲]

Detailed reference viewed: 48 (7 ULg)
Full Text
Peer Reviewed
See detailDe Kompia à Djolempoum : sur les sentiers tortueux de l’aménagement et de l'exploitation des forêts communautaires au Cameroun
Vermeulen, Cédric ULg; Vandenhaute, M.; Delvingt, W. et al

in VertigO : la Revue Electronique en Sciences de l'Environnement (2004), 7(1),

Started since one decade now, Community forestry in Cameroon presents half-hearted results. The goals of the 1994 law which aims to improve participation of locals populations to forest management and to ... [more ▼]

Started since one decade now, Community forestry in Cameroon presents half-hearted results. The goals of the 1994 law which aims to improve participation of locals populations to forest management and to increase their incomes seems to be hard to reach. Still this management process is criticised, mostly because of the complexity of the “simple management plan”. This article presents and analyses different experimental steps that were tested since ten years in Badjoué land in East Cameroon in order to make changes this precious tool to a participative and sustainable management of natural resources. [less ▲]

Detailed reference viewed: 44 (14 ULg)
Full Text
Peer Reviewed
See detailOlfactory responses to aphid and host plant volatile releases: (E)-beta-farnesene an effective kairomone for the predator Adalia bipunctata.
Francis, Frédéric ULg; Lognay, Georges ULg; Haubruge, Eric ULg

in Journal of Chemical Ecology (2004), 30(4), 741-55

The volatiles released from several aphid and host plant species, alone or associated, were studied for their infochemical role in prey location. Using a four-arm olfactometer, the attraction of several ... [more ▼]

The volatiles released from several aphid and host plant species, alone or associated, were studied for their infochemical role in prey location. Using a four-arm olfactometer, the attraction of several combinations of three aphid (Myzus persicae, Acyrthosiphon pisum, and Brevicoryne brassicae) and three plant (Vicia faba, Brassica napus, and Sinapis alba) species toward Adalia bipunctata larvae and adults was observed. Both predatory larvae and adults were attracted only by A. pisum and M. persicae when they were crushed, whatever the host plant. (E)-beta-farnesene, the aphid alarm pheromone, was the effective kairomone for the ladybird. Plant leaves alone (V. faba, B. napus, and S. alba) or in association with nonstressed whole aphids (the three species) did not have any attraction for the predator. The B. brassicae specialist aphid is the only prey that was not attracted to A. bipunctata larvae and adults, even if they were crushed. Release of B. brassicae molecules similar to the host plant allelochemicals was demonstrated by GC-MS analysis. The lack of behavioral response of the ladybird at short distance toward the cruciferous specialist aphid was related only to the absence of (E)-beta-farnesene in the aphid prey volatile pattern. [less ▲]

Detailed reference viewed: 70 (16 ULg)
Full Text
Peer Reviewed
See detailAge- and sex-stratified prevalence of physical disabilities and handicap in the general population.
Ethgen, Olivier ULg; Gillain, Daniel ULg; Gillet, Pierre ULg et al

in Aging Clinical & Experimental Research (2004), 16(5), 389-97

BACKGROUND AND AIMS: Our aim was to provide age- and sex-stratified prevalence estimates of physical disabilities and handicap in the general Belgian population. METHODS: A cross-sectional and ... [more ▼]

BACKGROUND AND AIMS: Our aim was to provide age- and sex-stratified prevalence estimates of physical disabilities and handicap in the general Belgian population. METHODS: A cross-sectional and demographically representative health interview survey was conducted nationwide in Belgium in 1997. The 8836 persons aged 15 years and over who answered the health interview were included in this study. Seventeen items from the survey encompassing main activities of daily living (ADL) and confining were analyzed. To provide prevalence estimates as detailed as possible, neither aggregation nor dichotomization were applied. RESULTS: Women consistently reported more disability than men: mobility (p < 0.001), transfer in-out bed (p < 0.001), transfer in-out chair (p < 0.001), dressing (p = 0.004), washing hands and face (p = 0.029), getting to and using toilet (p = 0.003), continence (p < 0.001), seeing (p < 0.001) and mastication (p < 0.001). As expected, there was a marked trend for increased prevalence of disability with increasing age for both sexes. Moderate disability arose mainly from the 25-34 age group for both sexes. For both genders, severe disability appeared mainly at higher ages, particularly for the 65-74 age group. Nevertheless, the data suggest that continence problems for women, mobility and transfer issues for men, as well as mastication problems for both genders, clearly emerge earlier than age 65. Regarding handicap, observed prevalence rates were increasing, in age as was the case for disability, but no differences were found between men or women, except for confinement to house/garden, for which women presented a higher rate in general (p < 0.001) and in the 75-84 age group (p = 0.036) in particular. CONCLUSIONS: This study shows the wide range of disability types in the general population and their association with handicap. While elderly individuals consistently report higher degrees of disability and handicap, attention should also be paid to younger age groups. Disability calls for wide, coherent and relevant medical as well as social responses. [less ▲]

Detailed reference viewed: 106 (10 ULg)
Full Text
See detailÉvolution d’une forme : métrique et versification chez Jaccottet
Purnelle, Gérald ULg

in Halpern, Anne-Élisabeth (Ed.) Éventail pour Jaccottet (2004)

Detailed reference viewed: 43 (9 ULg)
Full Text
Peer Reviewed
See detailA dynamic neighbourhood discovery protocol for active overlay networks
Martin, Sylvain ULg; Leduc, Guy ULg

in Lecture Notes in Computer Science (2004), 2982

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on ... [more ▼]

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on the IP routing table content augmented with traffic-based and dynamic refreshing techniques that allows it to react to virtual topology changes (nodes joining/leaving the overlay) as well as IP topology changes (broken and repaired link, route changes and moving nodes). This paper presents how the protocol detects overlay candidate nodes using probing capsules and the algorithms needed to select neighbours among the candidates. We also show how d-RADAR keeps the neighbouring table up to date and learns topology changes while keeping a low discovery and refresh overhead. A short summary of simulations carried out with our active network simulator illustrates how these algorithms actually behave. [less ▲]

Detailed reference viewed: 45 (17 ULg)
Full Text
See detailEl commercio justo como une arena y un proyecto de desarrollo. El caso de los cafeicultores en la region de Matagalpa.
Pleyers, Geoffrey; Pirotte, Gautier ULg

in Encuentro. Revista de la Universidad Centroamericana (Nicaragua) (2004), XXXVI(67), 132-149

Detailed reference viewed: 30 (2 ULg)
Full Text
Peer Reviewed
See detailLinks between producers and consumers in alternative food systems in France and Belgium : sustainable development made practical ?
Lamine, Claire; Stassart, Pierre M ULg

in Proceedings of Eursafe Congress 2004 (2004)

Detailed reference viewed: 5 (1 ULg)
Full Text
See detailEuropejski Projekt Interferometru
Surdej, Jean ULg

Article for general public (2004)

Detailed reference viewed: 5 (1 ULg)
Full Text
Peer Reviewed
See detailDetection of renal failure in overweight patients.
Delanaye, Pierre ULg; Radermecker, Régis ULg; Rorive, Marcelle ULg et al

in Kidney International (2004)

Detailed reference viewed: 14 (4 ULg)
Full Text
Peer Reviewed
See detailEstimation de la fonction rénale chez le patient anorexique
Delanaye, Pierre ULg; Radermecker, Régis ULg; Saint-Remy, Annie ULg et al

in Diabètes & Métabolism (2004), 30

Detailed reference viewed: 87 (5 ULg)
Full Text
Peer Reviewed
See detailProduction des ovins Djallonké en station dans la zone guinéenne au Bénin : 1. Performances de reproduction et influence des facteurs non génétiques
Gbangboche, A. B.; Hounzangbe-Adote, S. M.; Doko, S. Y. et al

in Revue Africaine de Santé et de Productions Animales [=RASPA] (2004), 2

Production of Djallonke sheep at an experimental station in the guinean zone of Benin. Reproduction performance and influence of non-genetic factors From 1994 to 2002, data from Djallonke sheep were ... [more ▼]

Production of Djallonke sheep at an experimental station in the guinean zone of Benin. Reproduction performance and influence of non-genetic factors From 1994 to 2002, data from Djallonke sheep were collected for reproduction performance. The data were obtained from the farm of the Faculty of Agronomic Sciences (University of Abomey Calavi). Data analysed by GLM procedure and Student’s t-test, were used to identify and quantify non-genetics factors affecting the age at first lambing, intervals between lambing and prolificacy. Results indicated: age at first lambing, 609.64days±110.26 days; intervals between lambing, 243.01days±68.19days; prolificity, 1.28±0.45; annual reproduction rate, 1.92%; temporary sterility rate, 5.79%. Lambing season, lambing year and the year*season interaction affected significantly (p<0.01) the age at first lambing and the interval between lambing. The same factors were not significant (p>0.05) for prolificacy. [less ▲]

Detailed reference viewed: 60 (3 ULg)
Full Text
See detailDerivation of the rotational frequency of massive stars from seismic studies
Aerts, C.; Scuflaire, Richard ULg; Thoul, Anne ULg

in Stellar Rotation. 215 (2004)

In this contribution we review the current status of the determination of the rotational frequency in non-radially pulsating B stars, i.e. beta Cep stars and slowly pulsating B stars. Considerable ... [more ▼]

In this contribution we review the current status of the determination of the rotational frequency in non-radially pulsating B stars, i.e. beta Cep stars and slowly pulsating B stars. Considerable progress is currently being made in the understanding of the non-radial oscillations of main-sequence B Stars by means of high-temporal, high-spatial resolution spectroscopic time series. This has led to the detection of frequency multiplets, which are interpreted as rotationally splitted non-radial modes and which allow an accurate determination of the surface rotational frequency in some stars. We outline how our future goal, i.e. the derivation of the internal rotation frequency, can be achieved. [less ▲]

Detailed reference viewed: 13 (5 ULg)
Full Text
See detailLe décasyllabe de Marie Étienne et son écriture générale (Anatolie, 1997)
Purnelle, Gérald ULg

in Formes Poétiques Contemporaines (2004), 2

Detailed reference viewed: 16 (5 ULg)
Full Text
See detailLate Frasnian Atrypida (Brachiopoda) from the Ardenne shelf (southern Belgium)
Mottequin, Bernard ULg

in Anonymous (Ed.) Abstracts with programme of the 48th Palaeontological Association Annual Meeting (2004)

Detailed reference viewed: 29 (5 ULg)
Full Text
Peer Reviewed
See detailEnhanced osteoclast development in collagen-induced arthritis in interferon-gamma receptor knock-out mice as related to increased splenic CD11b(+) myelopoiesis
De Klerck, Bert; Carpentier, Isabelle; Lories, Rick J et al

in Arthritis Research & therapy (2004), 6(3), 220-231

Collagen-induced arthritis (CIA) in mice is accompanied by splenomegaly due to the selective expansion of immature CD11b(+) myeloblasts. Both disease manifestations are more pronounced in interferon-gamma ... [more ▼]

Collagen-induced arthritis (CIA) in mice is accompanied by splenomegaly due to the selective expansion of immature CD11b(+) myeloblasts. Both disease manifestations are more pronounced in interferon-gamma receptor knock-out (IFN-gammaR KO) mice. We have taken advantage of this difference to test the hypothesis that the expanding CD11b(+) splenic cell population constitutes a source from which osteoclast precursors are recruited to the joint synovia. We found larger numbers of osteoclasts and more severe bone destruction in joints of IFN-gammaR KO mice than in joints of wild-type mice. Osteoclast-like multinucleated cells appeared in splenocyte cultures established in the presence of macrophage colony-stimulating factor (M-CSF) and stimulated with the osteoclast-differentiating factor receptor activator of NF-kappaB ligand (RANKL) or with tumour necrosis factor-alpha (TNF-alpha). Significantly larger numbers of such cells could be generated from splenocytes of IFN-gammaR KO mice than from those of wildtype mice. This was not accompanied, as might have been expected, by increased concentrations of the intracellular adaptor protein TRAF6, known to be involved in signalling of RANKL- and TNF-alpha-induced osteoclast formation. Splenocyte cultures of IFN-gammaR KO mice also produced more TNF-alpha and more RANKL than those of wild-type mice. Finally, splenocytes isolated from immunised IFN-gammaR KO mice contained comparatively low levels of pro-interleukin-1beta (pro-IL-1beta) and pro-caspase-1, indicating more extensive conversion of pro-IL-1beta into secreted active IL-1beta. These observations provide evidence that all conditions are fulfilled for the expanding CD11b(+) splenocytes to act as a source of osteoclasts and to be indirectly responsible for bone destruction in CIA. They also provide a plausible explanation for the higher susceptibility of IFN-gammaR KO mice to CIA. [less ▲]

Detailed reference viewed: 24 (2 ULg)