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See detailUne certaine idée du bonheur
Droixhe, Daniel ULg

in Droixhe, Daniel (Ed.) L'Esprit des journaux : un périodique europée au XVIIIe siècle (2009, October 12)

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See detailAn Interferometric Study of the Fomalhaut Inner Debris Disk. I. Near-Infrared Detection of Hot Dust with VLTI/VINCI
Absil, Olivier ULg; Mennesson, Bertrand; Le Bouquin, Jean-Baptiste et al

in Astrophysical Journal (2009), 704

The innermost parts of dusty debris disks around main-sequence stars are currently poorly known due to the high contrast and small angular separation with their parent stars. Using near-infrared ... [more ▼]

The innermost parts of dusty debris disks around main-sequence stars are currently poorly known due to the high contrast and small angular separation with their parent stars. Using near-infrared interferometry, we aim to detect the signature of hot dust around the nearby A4 V star Fomalhaut, which has already been suggested to harbor a warm dust population in addition to a cold dust ring located at about 140 AU. Archival data obtained with the VINCI instrument at the VLTI are used to study the fringe visibility of the Fomalhaut system at projected baseline lengths ranging from 4 m to 140 m in the K band. A significant visibility deficit is observed at short baselines with respect to the expected visibility of the sole stellar photosphere. This is interpreted as the signature of resolved circumstellar emission, producing a relative flux of 0.88% ± 0.12% with respect to the stellar photosphere. While our interferometric data cannot directly constrain the morphology of the excess emission source, complementary data from the literature allow us to discard an off-axis point-like object as the source of circumstellar emission. We argue that the thermal emission from hot dusty grains located within 6 AU from Fomalhaut is the most plausible explanation for the detected excess. Our study also provides a revised limb-darkened diameter for Fomalhaut (theta_LD = 2.223 ± 0.022 mas), taking into account the effect of the resolved circumstellar emission. Based on observations made with ESO Telescopes at the Paranal Observatory (public VINCI commissioning data). [less ▲]

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See detailNaissance et renaissance de vétérans: interactions entre l'Arbre et l'Homme au fil des siècles
Campanella, Bruno ULg; Kervyn, Vincent; Delcroix, Bernard et al

Conference (2009, October 10)

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See detailIntroduction à la Révolution Culturelle
Cavazzini, Andrea ULg

Scientific conference (2009, October 10)

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See detailBovine colostrum as a natural growth factor for newly-weaned piglets: A review
Boudry, Christelle ULg; Thewis, André ULg

in Bulletin of University of agricultural sciences and veterinary medicine Cluj-Napoca. Animal Science and Biotechnolobies (2009, October 09), 66(1-2), 53-60

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See detailFirm-Level Evidence on Innovation in Spain
Artige, Lionel ULg

Conference (2009, October 08)

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See detailL'arbre dans le patrimoine culturel immatériel
Lempereur, Françoise ULg

Conference (2009, October 08)

La communication s'attache à définir les pratiques culturelles dans laquelle l’arbre s’inscrit : pratiques coutumières du temps et des groupes, pratiques économiques, politiques, alimentaires, techniques ... [more ▼]

La communication s'attache à définir les pratiques culturelles dans laquelle l’arbre s’inscrit : pratiques coutumières du temps et des groupes, pratiques économiques, politiques, alimentaires, techniques, ludiques, expressives, scientifiques et éthiques. Elle tente de définir le statut de l’arbre au sein des sociétés traditionnelles et examine quelles valeurs identitaires, esthétiques, juridiques, symboliques ou pragmatiques sont aujourd’hui liées aux arbres patrimoniaux et comment les collectivités et/ou les institutions peuvent (ou doivent) prendre en charge la protection de ces valeurs et surtout leur transmission. [less ▲]

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See detailFilms minces mesoporeux d’oxydes mixtes de vanadium et de niobium comme électrode positive pour accumulateurs au lithium
Krins, Natacha ULg

Doctoral thesis (2009)

Mesoporous thin films are promising architectures for positive electrodes in Li-ion battery applications. A particular challenge in this field has been successful templating of vanadium-based oxides ... [more ▼]

Mesoporous thin films are promising architectures for positive electrodes in Li-ion battery applications. A particular challenge in this field has been successful templating of vanadium-based oxides, materials known for their ability to host lithium, since their thermal instability and complex vanadium chemistry hinder templating through traditional soft-chemistry approaches. To address these technical problems we develop the soft-templating of vanadium and niobium mixed oxides based on Evaporation Induced Micelles Packing using thermally stable polystyrene-b-polyethyleneoxide structuring agents. In-situ thermal monitoring via ellipsometry allows successful navigation of the thermal stability landscape. TEM and AFM analyses reveal homogeneous wormlike mesoporous structures whose pore and inorganic wall sizes can be tuned from 15 to 100 nm by changing the hydrophobic/hydrophilic surfactant chain lengths. Ellipsometric porosimetry shows that 100 nm thick films with a 15 nm pore size displays 30% electrolyte accessible porosity. The interconnected tridimensional mesoporous network has been highlighted by electronic tomography. Thicker films up to 1.3 µm are prepared by a multidipping process. The superiority of such nanoarchitectures compared to non porous materials in terms of electrochemical properties such as capacity are revealed using cyclic voltammetry. [less ▲]

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See detailExtension et modulation des usages des outils médiateurs en design industriel. Impact sur les processus de conception.
Elsen, Catherine ULg

Master of advanced studies dissertation (2009)

L'observation via une approche ergonomique compréhensive de l'extension et la modulation de l'utilisation des outils médiateurs en design industriel depuis l'avènement de la CAO nous a permis : (i) d ... [more ▼]

L'observation via une approche ergonomique compréhensive de l'extension et la modulation de l'utilisation des outils médiateurs en design industriel depuis l'avènement de la CAO nous a permis : (i) d'élargir les frontières du domaine de la pré-conception telles que généralement présentées : y sont désormais inclues, en plus des dessins à main levée, les représentations externes générées par les outils de CAO, dont le potentiel de soutien aux phases conceptuelles sera révélé lorsque l'on aura extrait des catachrèses, genèses instrumentales et schèmes d'utilisation l'essence des spécifications qui les rendront tout à fait adaptées; (ii) de moduler les niveaux de compréhension des métiers de la conception en design industriel, en soulignant l'importante part de co-conception et de "conception en cohabitation" qui apparaît avec le nouveau métier de dessinateur et l'usage des outils médiateurs. L'intervention sur le terrain est nourrie de ces apports plus conceptuels qui nous aident à comprendre dans quelle mesure l'amélioration des conditions de travail en conception industrielle pourrait concourir à l'atteinte des objectifs ergonomiques pour les autres métiers et les utilisateurs finaux. [less ▲]

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See detailPresentation of the Unit of Geomatics of the University of Liege
Donnay, Jean-Paul ULg

Scientific conference (2009, October 06)

Presentation of the researches carried out in the service of the Geomatics Unit, University of Liège: Geodesy and GNSS, Remote Sensing and Photogrammetry, Geographic Information Science, Cartography ... [more ▼]

Presentation of the researches carried out in the service of the Geomatics Unit, University of Liège: Geodesy and GNSS, Remote Sensing and Photogrammetry, Geographic Information Science, Cartography, Spatial Analysis [less ▲]

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See detailUtiliser une recherche-action comme étape d'une innovation
Absil, Gaëtan ULg; Vandoorne, Chantal ULg

Poster (2009, October 02)

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See detailVoies et voix du traducteur
Pagnoulle, Christine ULg

Scientific conference (2009, October 02)

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See detailVitamin D, Status and perspectives
CAVALIER, Etienne ULg

Conference (2009, October 02)

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See detailVitamin D: status and perspectives
Cavalier, Etienne ULg

Conference given outside the academic context (2009)

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See detailThe effect of intercropping between wheat and pea on spatial distribution of Sitobion avenae based on GIS
Zhou, Haibo ULg

in Scientia Agricultura Sinica = Zhongguo nongye kexue (2009), 42(11), 3904-3913

【Objective】 In order to research the effect of biodiversity on spatial distribution of Sitobion avenae in wheat, the population density of S. avenae was investigated in wheat fields in Langfang ... [more ▼]

【Objective】 In order to research the effect of biodiversity on spatial distribution of Sitobion avenae in wheat, the population density of S. avenae was investigated in wheat fields in Langfang Experimental Station of Institute of Plant Protection, Chinese Academy of Agricultural Sciences, using wheat intercropped with pea by different patterns, and the field cultivar monoculture of wheat was planted as control.【Method】Using the Geographical Information System(GIS) and the traditional analysis methods of spatial distribution, the Kriging-interpolation figures, aggregation indices, Iwao and Taylor′s regression models were analyzed.【Result】The results showed that the spatial distribution of S. avenae was mainly aggregation distribution in intercropping patterns of wheat and pea, by the planting row of pea : wheat in 2︰2, 2︰4, 2︰6 ,2︰8 and wheat monoculture, but the degrees of aggregation were different, 2︰2 pattern > 2︰6 pattern > 2︰4 pattern > wheat monoculture > 2︰8 pattern. Kriging-interpolation figures indicated that wheat aphids distributed mainly around the field during early stage, and spreaded to the middle of field gradually. There were many aggregation centers mostly at wheat monoculture and 2︰2patterns plots during aphid peak period. Compared with each intercropping field, there were higher population densities of aphid in field cultivar monocultures at the level of P<0.01.【Conclusion】Although the reasonable biodiversity in wheat fields could control the population of wheat aphid effectively, the spatial distribution did not change. [less ▲]

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See detailEffects of wheat-pea intercropping on the population dynamics of Sitobion avenae (Homoptera: Aphididae) and its main natural enemies
Zhou, Haibo ULg

in Kun Chong Xue Bao = Acta Entomologica Sinica (2009), 52(7), 775-782

To study the ecological regulation effects of species diversity in wheat fields on Sitobion avenae, field experiments were carried out in Langfang Experimental Station of Institute of Plant Protection ... [more ▼]

To study the ecological regulation effects of species diversity in wheat fields on Sitobion avenae, field experiments were carried out in Langfang Experimental Station of Institute of Plant Protection, Chinese Academy of Agricultural Sciences from October of 2007 to July of 2008. The intercropping patterns of wheat and pea, by the proportion of planting row of pea and wheat in 2:2, 2:4, 2:6 and 2:8, were plotted, and the field cultivar monoculture of wheat was planted as the control. Population dynamics of apterae and alatae S. avenae, population dynamics, species richness, diversity index and evenness of main natural enemies were investigated systematically and analyzed. The results showed that, compared with monoculture of wheat, the amount of S. avenae apterae per 100 plants (square-root transformed) in aphid peak period were very significantly lower in the intercropping treatments (P<0.01), and the cascade was that wheat monoculture (77.38) > 2-2 intercropping (68.62) > 2-4 intercropping (68.51) > 2-8 intercropping (65.19) > 2-6 intercropping (64.94). Although population dynamics of main natural enemies showed a similar trend with time, wheat-pea intercropping could preserve and augment natural enemies more than monoculture of wheat, and there were higher population densities of ladybeetles and aphid parasitoids, and higher species richness and diversity index of natural enemies, but lower evenness index in each intercropping field. It is so concluded that wheat-pea intercropping system can not only reduce the population of S. avenae, but also improve the stability and sustainability of controlling wheat pests. [less ▲]

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See detailGround-based observations of the beta Cephei CoRoT main target HD 180 642: abundance analysis and mode identification
Briquet, Maryline ULg; Uytterhoeven, K.; Morel, Thierry ULg et al

in Astronomy and Astrophysics (2009), 506

The known β Cephei star HD 180 642 was observed by the CoRoT satellite in 2007. From the very high-precision light curve, its pulsation frequency spectrum could be derived for the first time (Degroote ... [more ▼]

The known β Cephei star HD 180 642 was observed by the CoRoT satellite in 2007. From the very high-precision light curve, its pulsation frequency spectrum could be derived for the first time (Degroote and collaborators). In this paper, we obtain additional constraints for forthcoming asteroseismic modeling of the target. Our results are based on both extensive ground-based multicolour photometry and high-resolution spectroscopy. We determine T_eff = 24 500± 1000 K and log g = 3.45± 0.15 dex from spectroscopy. The derived chemical abundances are consistent with those for B stars in the solar neighbourhood, except for a mild nitrogen excess. A metallicity Z = 0.0099± 0.0016 is obtained. Three modes are detected in photometry. The degree â is unambiguously identified for two of them: â = 0 and â = 3 for the frequencies 5.48694 d[SUP]-1[/SUP] and 0.30818 d[SUP]-1[/SUP], respectively. The radial mode is non-linear and highly dominant with an amplitude in the U-filter about 15 times larger than the strongest of the other modes. For the third frequency of 7.36673 d[SUP]-1[/SUP] found in photometry, two possibilities remain: â = 0 or 3. In the radial velocities, the dominant radial mode presents a so-called stillstand but no clear evidence of the existence of shocks is observed. Four low-amplitude modes are found in spectroscopy and one of them, with frequency 8.4079 d[SUP]-1[/SUP], is identified as (â ,m)=(3,2). Based on this mode identification, we finally deduce an equatorial rotational velocity of 38± 15 km s[SUP]-1[/SUP]. Based on data gathered with the 1.2m Mercator telescope Roque de los Muchachos, La Palma, the 90cm telescope at Sierra Nevada Observatory, Spain, the 1.5 m telescope at San Pedro Mártir Observatory, Mexico, the 1m RCC and 50 cm telescope at the PiszkéstetÅ Mountain Station of Konkoly Observatory, Hungary, the 2.2 m ESO telescope (ESO Programme 077.D-0311; ESO Large Programme 178.D-0361) at La Silla, Chile, the 1.93 m and 1.52 m telescopes at the Haute-Provence Observatory, France. Current address: Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot; CEA, IRFU, SAp, centre de Saclay, 91191 Gif-sur-Yvette, France. [less ▲]

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