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See detailBulletin agrométéorologique - Avril 2005
Tychon, Bernard ULg; Ozer, Pierre ULg; De Longueville, Florence ULg et al

in Bulletin Agrométéorologique (2005), 4(1), 1-5

L’hiver météorologique (décembre 2004 à février 2005) peut être caractérisé de normal, tout comme les mois de mars et avril qui lui ont succédé. La situation des cultures d’hiver est également normale ... [more ▼]

L’hiver météorologique (décembre 2004 à février 2005) peut être caractérisé de normal, tout comme les mois de mars et avril qui lui ont succédé. La situation des cultures d’hiver est également normale, avec des rendements qui s’annoncent généralement supérieurs à ceux de 2003 et de 2004 pour le froment d’hiver. Dans le cas de l’orge d’hiver, les estimations de rendements n’atteignent pas les résultats de 2004 mais dépassent largement les rendements observés en 2003. Il est prématuré d’émettre des prévisions pour les cultures printanières. [less ▲]

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See detailSuivi de l'état de l'AGRIculture WALlonne par TELédétection (projet SAGRIWATEL)
Tychon, Bernard ULg; Istasse, Alain

Conference (2005, May 11)

Le projet de recherche et développement sur le « Suivi de l’Etat l’Agriculture Wallonne par Télédétection (SAGRIWATEL) » entamé en janvier 2003 est réalisé dans le cadre d’une étroite collaboration entre ... [more ▼]

Le projet de recherche et développement sur le « Suivi de l’Etat l’Agriculture Wallonne par Télédétection (SAGRIWATEL) » entamé en janvier 2003 est réalisé dans le cadre d’une étroite collaboration entre une équipe de scientifiques provenant de différents organismes de recherche wallons (Centre Wallon de Recherches Agronomiques, Université de Liège, Université Catholique de Louvain, Faculté Universitaire des Sciences Agronomiques de Gembloux) et l’Administration Wallonne de l’Agriculture (DGA). Il vise à mettre en place pour l’Administration Wallonne de l’Agriculture des outils de suivi de l’agriculture tant pour ce qui concerne ses activités de production que pour ce qui concerne ses activités en lien avec la protection du milieu (mesures agro-environnementales). Ces outils sont conçus, selon les cas, pour du contrôle, de l’encadrement ou encore pour le suivi global de l’évolution de l’agriculture à l’échelle de la région wallonne. Le système vise à valoriser la base de données du Système Intégré de Gestion et de Contrôle (SIGC) qui est en mesure de fournir des informations pour des applications autres que celles pour lesquelles il a été conçu. En association avec de l’information satellite ou aérienne et des modèles de croissance des cultures une série d’applications concrètes ont été élaborées pour : - la prévision des productions agricoles - la délimitation de zones à stress hydrique - le repérage et l’estimation de surfaces ou de longueurs de bandes enherbées, haies,… - le repérage de la couverture hivernale des sols - le repérage du sens du labour - le suivi des successions culturales - le suivi de la diversité des cultures - l’évolution de la taille des parcelles - … Le système bénéficie de l’apport du SIGC graphique qui fonctionne en Belgique de manière opérationnelle depuis 1997. L’utilisation originale qui est faite du SIGC dans cette étude constitue une nouvelle valorisation de ce système cartographique au départ destiné uniquement à du contrôle des déclarations des agriculteurs. L’approche est intéressante car elle permet un meilleur suivi de l’état de l’agriculture pour l’Administration avec un outil dont elle a la maîtrise, lui permettant de répondre rapidement aux demandes, notamment de l’Europe. En outre, l’outil s’est révélé rapidement opérationnel et adaptable à de nouvelles demandes ce qui constitue un avantage non négligeable quand l’on analyse les fréquentes évolutions de la PAC de ces dernières années. Enfin, l’approche optimise les informations transmises par les agriculteurs lors de leur déclaration PAC, leur évitant des pertes de temps dans des demandes de renseignement répétitives conduisant en quelque sorte à une simplification administrative. L’accès à l’information au sein de la Direction Générale de l’Agriculture se fera via une interface WEB-GIS. Un prototype sera opérationnel dans moins de deux mois. Il est prévu qu’à terme, d’autres Institutions Wallonnes et les agriculteurs wallons euxmêmes puissent bénéficier de cette avancée technologique. [less ▲]

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See detailOptical spectroscopy of X-Mega targets - V. The spectroscopic binary HD 93161 A and its visual companion HD 93161 B
Nazé, Yaël ULg; Antokhin, I. I.; Sana, H. et al

in Monthly Notices of the Royal Astronomical Society (2005), 359(2), 688-698

We present the analysis of an extensive set of high-resolution spectroscopic observations of HD 93161, a visual binary with a separation of 2 arcsec. HD 93161 A is a spectroscopic binary, with both ... [more ▼]

We present the analysis of an extensive set of high-resolution spectroscopic observations of HD 93161, a visual binary with a separation of 2 arcsec. HD 93161 A is a spectroscopic binary, with both components clearly detected throughout the orbit. The primary star is most probably of spectral type O8V, while the secondary is likely an O9V. We obtain the first orbital solution for this system, characterized by a period of 8.566 +/- 0.004 d. The minimum masses of the primary and secondary stars are 22.2 +/- 0.6 and 17.0 +/- 0.4 M-., respectively. These values are quite large, suggesting a high inclination of the orbit. The second object, HD 93161 B, displays an O6.5V(f) spectral type and is thus slightly hotter than its neighbour. This star is at first sight single but presents radial velocity variations. Finally, we study HD 93161 in the X-ray domain. No significant variability is detected. The X-ray spectrum is well described by a 2T model with kT(1) similar to 0.3 keV and kT(2) similar to 0.7 keV. The X-ray luminosity is rather moderate, without any large emission excess imputable to a wind interaction. [less ▲]

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See detailIndividual and combined effects of dosages of azoxystrobin and epoxiconazole in wheat
Moreau, Jean-Marc; Bodson, Bernard ULg; Maraite, H. et al

in Communications in Agricultural and Applied Biological Sciences (2005, May 10), 70(3), 91-99

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See detailSelectivity lists of pesticides to beneficial arthropods for IPM programs in carrot--first results.
Hautier, L.; Jansen, J.-P.; Mabon, N. et al

in Communications in Agricultural and Applied Biological Sciences (2005, May 10), 70(4), 547-558

In order to improve IPM programs in carrot, 7 fungicides, 12 herbicides and 9 insecticides commonly used in Belgium were tested for their toxicity towards five beneficial arthropods representative of most ... [more ▼]

In order to improve IPM programs in carrot, 7 fungicides, 12 herbicides and 9 insecticides commonly used in Belgium were tested for their toxicity towards five beneficial arthropods representative of most important natural enemies encountered in carrot: parasitic wasps- Aphidius rhopalosiphi (De Stefani-Perez) (Hym., Aphidiidae), ladybirds - Adalia bipunctata (L.) (Col., Coccinellidae), hoverfly - Episyrphus balteatus (Dipt., Syrphidae), rove beetle - Aleochara bilineata (Col., Staphyllinidae) and carabid beetle - Bembidion lampros (col., Carabidae). [less ▲]

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See detailDissolved Inorganic Carbon dynamics in the northern Bay of Biscay during a Coccolithophore bloom
Harlay, Jérôme ULg; van der Zee, Claar; Schiettecatte, Laure-Sophie et al

Poster (2005, May 02)

In the framework of the Belgian global change programme, we have developed a project devoted to the study of the inorganic carbon cycle in the Bay of Biscay where coccolithophore blooms occur frequently ... [more ▼]

In the framework of the Belgian global change programme, we have developed a project devoted to the study of the inorganic carbon cycle in the Bay of Biscay where coccolithophore blooms occur frequently. The study focuses on processes associated with the oceanic production and dissolution of calcium carbonate and related CO2 fluxes. Real time remote sensing allowed to localize the coccolithophore bloom that the R.V. Belgica visited in June 2004 during a multidisciplinary scientific cruise. We will present vertical profiles of pH, Talk, along with other parameters (salinity, temperature, chlorophyll a and phaeopigments) and 14C incorporation experiments. Inorganic carbon fluxes will be discussed in the photic zone, in correlation with the biological activity of phytoplankton (biological and carbonate pumps). [less ▲]

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See detailBallistic-diffusive heat conduction at nanoscale: GENERIC approach [rapid communication]
Grmela, M.; Lebon, Georgy ULg; Dauby, Pierre ULg et al

in Physics Letters A (2005), 339

Heat conduction in nanosize systems has to be studied in settings involving microscopic details that are not seen in the classical Fourier theory. G. Chen has suggested [Phys. Rev. Lett. 86 (2001) 2297] a ... [more ▼]

Heat conduction in nanosize systems has to be studied in settings involving microscopic details that are not seen in the classical Fourier theory. G. Chen has suggested [Phys. Rev. Lett. 86 (2001) 2297] a combination of the Cattaneo setting in which the velocity of the heat propagation is finite and the kinetic theory setting in which phonons are seen as heat carriers. In this Letter we show that if the Cattaneo and the kinetic theories are combined in a way that preserves the structure expressing their compatibility with thermodynamics (GENERIC structure) then both the Cattaneo and the kinetic equations become modified. The modified Cattaneo equations involve the term introduced by Chen and, in addition, new terms that are nonlinear in quantities that disappear at equilibrium. The kinetic equation is modified by new terms involving gradients of the heat flux and the local temperature. [less ▲]

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See detailConvection-pulsation coupling. I. A mixing-length perturbative theory
Grigahcène, A.; Dupret, Marc-Antoine ULg; Gabriel, Maurice ULg et al

in Astronomy and Astrophysics (2005), 434

We present in details a time-dependent convection treatment in the frame of the Mixing-Length Theory (MLT). Following the original ideas by Unno (1967, PASJ, 19, 140), this theory has been developed by ... [more ▼]

We present in details a time-dependent convection treatment in the frame of the Mixing-Length Theory (MLT). Following the original ideas by Unno (1967, PASJ, 19, 140), this theory has been developed by Gabriel et al. (1974, Bull. Ac. Roy. Belgique, Classe des Sciences, 60, 866) and Gabriel (1996, Bull. Astron. Soc. India, 24, 233). In this paper, we present it in a united form, we detail the basic derivations and approximations and give final improvements. A new perturbation of the energy closure equation is proposed for the first time, making it possible to avoid the occurrence of short wavelength spatial oscillations of the thermal eigenfunctions. This theory accounts for the perturbation of the convective flux, the turbulent Reynolds stress and the turbulent kinetic energy dissipation. It has been numerically implemented in a non-radial non-adiabatic pulsation code and the first results published in a Letter by Dupret et al. (2004a, A&A, 414, L17) indicate that the theory predicts the observed red border of the lower end of the instability strip and the driving mechanism of the recently discovered gamma Dor stars. [less ▲]

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2005)

A-t-on vu des planètes extrasolaires?, Sedna, Mars, Ceinture de Kuiper, L'anneau de Neptune Liberté en péril, Extinctions, GRBs, Collisions lointaines, Galaxie de la Grande Ourse, Sources de rayons gamma ... [more ▼]

A-t-on vu des planètes extrasolaires?, Sedna, Mars, Ceinture de Kuiper, L'anneau de Neptune Liberté en péril, Extinctions, GRBs, Collisions lointaines, Galaxie de la Grande Ourse, Sources de rayons gamma au centre de la Voie Lactée [less ▲]

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See detailCompilation of data collected and fed into a hydrogeological database in the Walloon Meuse catchment region
Batlle-Aguilar, Jordi; Wojda, Piotr; Brouyère, Serge ULg

Report (2005)

Based on a first inventory of available case studies, test sites have been selected in the Walloon part of the Meuse Basin in Belgium. These sites meet the requirements and objectives of the researches ... [more ▼]

Based on a first inventory of available case studies, test sites have been selected in the Walloon part of the Meuse Basin in Belgium. These sites meet the requirements and objectives of the researches performed by different partners in AquaTerra. Available information and datasets have been collected for these sites and complementary investigations and experiments have been organized. Existing data and recently collected data have been compiled into a hydrogeological database developed by HGULg for the Walloon region and adapted to the specificities and needs of the AquaTerra project. The deliverable provides a general description of the hydrogeological database developed by HGULg: the conceptual model, specific adaptations performed for the AquaTerra project and interfaces for encoding, querying and exporting hydrogeological information stored in the database. A synthesis of datasets available in the HGULg Hydrogeological Database for the selected test sites in the Meuse basin is also provided. [less ▲]

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See detailALE simulations using Metafor
Boman, Romain ULg

Scientific conference (2005, May)

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See detailChapter in BASIN report on structured research results for further interpretation in terms of management tools/approaches for river basin management (INTEGRATOR), and in terms of EU policy impacts (EUPOL), delivered to the steering committee and Overview of analysis results for the Dommel catchment system
Joziasse, Jan; Vink, J.; Brouyère, Serge ULg

Report (2005)

An overview is presented of the research activities conducted by several AquaTerra work packages (BASIN, TREND, FLUX, BIOGEOCHEM) in the Meuse basin, with the emphasis on two specific sites: the Walloon ... [more ▼]

An overview is presented of the research activities conducted by several AquaTerra work packages (BASIN, TREND, FLUX, BIOGEOCHEM) in the Meuse basin, with the emphasis on two specific sites: the Walloon region and the Dommel catchment. The preliminary results and the relevance for management issues are presented. Furthermore, the progress in the formation of a stakeholder group and the organisation of a workshop with these stakeholders is reported. [less ▲]

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See detailCompilation of data collected and fed into a hydrogeological database in the Walloon Meuse catchment region
Batlle-Aguilar, Jordi; Wojda, Piotr; Brouyère, Serge ULg

Report (2005)

The objectives of this deliverable are to provide a general description of a hydrogeological database developed by HGULg, including specific adaptations made to meet the AQUATERRA project’s needs and to ... [more ▼]

The objectives of this deliverable are to provide a general description of a hydrogeological database developed by HGULg, including specific adaptations made to meet the AQUATERRA project’s needs and to provide a synthesis of available datasets for the selected test sites in the Meuse basin. First, a general description of the Walloon Meuse basin and the selected AQUATERRA test sites is provided. Then, the general concepts, the conceptual model and the developed interfaces of the HGULg hydrogeological database are presented. Finally, a summary of datasets available for the selected test sites is provided. [less ▲]

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See detailHigh doses of transplanted CD34(+) cells are associated with rapid T-cell engraftment and lessened risk of graft rejection, but not more graft-versus-host disease after nonmyeloablative conditioning and unrelated hematopoietic cell transplantation
Baron, Frédéric ULg; Maris, M. B.; Storer, B. E. et al

in Leukemia (2005), 19(5), 822-828

This report examines the impact of graft composition on outcomes in 130 patients with hematological malignancies given unrelated donor granulocyte-colony-stimulating-factor-mobilized peripheral blood ... [more ▼]

This report examines the impact of graft composition on outcomes in 130 patients with hematological malignancies given unrelated donor granulocyte-colony-stimulating-factor-mobilized peripheral blood mononuclear cells (G-PBMC) ( n = 116) or marrow ( n = 14) transplantation after nonmyeloablative conditioning with 90 mg/m(2) fludarabine and 2Gy TBI. The median number of CD34(+) cells transplanted was 6.5 x 10(6)/ kg. Higher numbers of grafted CD14(+) ( P = 0.0008), CD3(+) ( P = 0.0007), CD4(+) ( P = 0.001), CD8(+) ( P = 0.004), CD3 - CD56(+) ( P = 0.003), and CD34(+) ( P = 0.0001) cells were associated with higher levels of day 28 donor T-cell chimerism. Higher numbers of CD14(+) ( P = 0.01) and CD34(+) ( P = 0.0003) cells were associated with rapid achievement of complete donor T-cell chimerism, while high numbers of CD8(+) ( P = 0.005) and CD34(+) ( P = 0.01) cells were associated with low probabilities of graft rejection. When analyses were restricted to G-PBMC recipients, higher numbers of grafted CD34(+) cells were associated with higher levels of day 28 donor T-cell chimerism ( P = 0.01), rapid achievement of complete donor T-cell chimerism ( P = 0.02), and a trend for lower risk for graft rejection ( P = 0.14). There were no associations between any cell subsets and acute or chronic GVHD nor relapse/progression. These data suggest more rapid engraftment of donor T cells and reduced rejection rates could be achieved by increasing the doses of CD34(+) cells in unrelated grafts administered after nonmyeloablative conditioning. [less ▲]

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See detailA CIDR Prefix Stopping Rule for Topology Discovery
Donnet, Benoît ULg; Friedman, Timur

in Proc. Algotel (2005, May)

Recently, a first step towards a highly distributed IP-level topology discovery tool has been made with the introduction of the Doubletree algorithm. Doubletree is an efficient cooperative algorithm that ... [more ▼]

Recently, a first step towards a highly distributed IP-level topology discovery tool has been made with the introduction of the Doubletree algorithm. Doubletree is an efficient cooperative algorithm that allows the discovery of a large portion of nodes and links in the network while strongly reducing probing redundancy on nodes and destinations as well as the amount of probes sent. In this paper, we propose to reduce more strongly the load on destinations and, more essentially, the communication cost required for the cooperation by introducing a probing stop rule based on CIDR address prefixes. [less ▲]

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See detailIn vitro characterization of the Bacillus subtilis protein tyrosine phosphatase YwqE
Mijakovic, Ivan; Musumeci, Lucia ULg; Tautz, Lutz et al

in Journal of Bacteriology (2005), 187(10), 3384-90

Both gram-negative and gram-positive bacteria possess protein tyrosine phosphatases (PTPs) with a catalytic Cys residue. In addition, many gram-positive bacteria have acquired a new family of PTPs, whose ... [more ▼]

Both gram-negative and gram-positive bacteria possess protein tyrosine phosphatases (PTPs) with a catalytic Cys residue. In addition, many gram-positive bacteria have acquired a new family of PTPs, whose first characterized member was CpsB from Streptococcus pneumoniae. Bacillus subtilis contains one such CpsB-like PTP, YwqE, in addition to two class II Cys-based PTPs, YwlE and YfkJ. The substrates for both YwlE and YfkJ are presently unknown, while YwqE was shown to dephosphorylate two phosphotyrosine-containing proteins implicated in UDP-glucuronate biosynthesis, YwqD and YwqF. In this study, we characterize YwqE, compare the activities of the three B. subtilis PTPs (YwqE, YwlE, and YfkJ), and demonstrate that the two B. subtilis class II PTPs do not dephosphorylate the physiological substrates of YwqE. [less ▲]

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See detailNaming very familiar people : when retrieving names is faster than retrieving semantic biographical information
Brédart, Serge ULg; Brennen, T.; Delchambre, Marie ULg et al

in British Journal of Psychology (2005), 96(Pt 2), 205-214

One of the most reliable findings in the literature on person indentification is that semantic categorization of a face occurs more quickly than naming a face. Here we present two experiments in which ... [more ▼]

One of the most reliable findings in the literature on person indentification is that semantic categorization of a face occurs more quickly than naming a face. Here we present two experiments in which participants are shown the faces of their colleagues, i.e., personally familiar people, encountered with high frequency. In each experiment, naming was faster than making a semantic classification, despite the fact that the semantic classifications were highly salient to the participants (Experiment I highest degree obtained; Experiment 2: nationality). The finding is consistent with models that allow or parallel access from faces to semantic information and to names, and demonstrates the need for the frequency of exposure to names to be taken into account in models of proper name processing e.g. Burke, Mackay, Worthley and Wade (1991). [less ▲]

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See detailA framework for the complexity of high-multiplicity scheduling problems
Brauner, Nadia; Crama, Yves ULg; Grigoriev, Alexander et al

in Journal of Combinatorial Optimization (2005), 9(3), 313-323

The purpose of this note is to propose a complexity framework for the analysis of high multiplicity scheduling problems. Part of this framework relies on earlier work aiming at the definition of output ... [more ▼]

The purpose of this note is to propose a complexity framework for the analysis of high multiplicity scheduling problems. Part of this framework relies on earlier work aiming at the definition of output-sensitive complexity measures for the analysis of algorithms which produce "large" outputs. However, different classes emerge according as we look at schedules as sets of starting times, or as related single-valued mappings. [less ▲]

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See detailLa polygamie devant la Cour d'arbitrage
Carlier, Jean-Yves ULg

in Journal du Juriste (2005), 42(1), 1

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