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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 detailFilologia dei carteggi volgari quattro-cinquecenteschi
Moreno, Paola ULg

in Studi e Problemi di Critica Testuale (2012)

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See detailFilter failure analysis for the SWAP instrument on-board of PROBA2
Jonckheere, Stijn; Bergen, Bart; Halain, Jean-Philippe ULg et al

in COMPDYN (2011, May)

During its intensive testing campaign, SWAP (Sun Watcher using Active Pixel System detector and image Processing), an optical instrument developed by Centre Spatiale de Liege (CSL) and mounted onto the ... [more ▼]

During its intensive testing campaign, SWAP (Sun Watcher using Active Pixel System detector and image Processing), an optical instrument developed by Centre Spatiale de Liege (CSL) and mounted onto the Belgian satellite PROBA2, was subjected to a multitude of load cases to verify the integrity of the instrument during and after the launch and during the operational phase. The front and rear filters of SWAP, 200 nm thin films, survived intensive vibration tests on the qualification model and acceptance tests on the flight model, both at an instrument level. During the acoustic test on the spacecraft, the front filter exploded while the rear one was undamaged. A new, strengthened filter, coated with a very fine metal mesh was mounted in the instrument. However, this new filter has less good optical properties due to optical diffraction. Therefore a profound analysis of the filter failure is necessary to provide the best possible optical accuracy for future missions with similar equipment. Three load cases are further studied in this paper: the acceleration of the rocket, the instrument depressurisation and the vibro-acoustic behaviour under the large sound and vibration levels. The acceleration and depressurisation are studied together in a two-level computational fluid dynamics (CFD) analysis to assess the effect of the venting of the instrument on the differential pressure over the filter. The main focus of this paper is on a numerical vibro-acoustic analysis, following the procedures used by CSL and ESTEC (European Space Research and Technology Centre). This analysis needs special attention because of the presence of a stochastic excitation (diffuse field) and the very nonlinear behaviour of the filter itself due to its small thickness. Also, an additional postprocessing step based on filter displacements, rather than differential pressure, as done in the ESTEC procedure, is discussed. [less ▲]

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See detailFiltering inertia-gravity waves from the initial conditions of the linear shallow water equations
Barth, Alexander ULg; Beckers, Jean-Marie ULg; Alvera Azcarate, Aïda ULg et al

in Ocean Modelling (2007), 19(3-4), 204-218

A method for filtering inertia-gravity waves from elevation and depth-averaged velocity is described. This filtering scheme is derived from the linear shallow water equations for constant depth and ... [more ▼]

A method for filtering inertia-gravity waves from elevation and depth-averaged velocity is described. This filtering scheme is derived from the linear shallow water equations for constant depth and constant Coriolis frequency. The filtered solution is obtained by retaining only the eigenvectors corresponding to the geostrophic equilibrium and by discarding explicitly the eigenvectors corresponding to the fast moving inertia-gravity waves. An alternative formulation is derived using a variational approach. Both filtering methods are tested numerically for a periodic domain with constant depth and the variational approach is implemented for a closed domain with large topographic variations. The filtering methods significantly reduce the amplitudes of the inertia-gravity waves while preserving the mean flow. The variational method is compared to the Incremental Analysis Update technique and the benefits of the variational filter are presented. (C) 2007 Elsevier Ltd. All rights reserved. [less ▲]

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See detailLa filtration a membrane dans la fabrication des jus de fruits.
Deroanne, C.; Paquot, Michel ULg

in Fruit Belge (1987), 55(418),

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See detailFiltration and digestion responses of an elementally homeostatic consumer to changes in food quality: a predictive model
Darchambeau, François ULg

in Oikos (2005), 111(2), 322-336

In the study of the stoichiometric relationship between autotrophs and herbivores, attention has been largely focused on effects of the encountered mismatch between needs and supplies of an element on ... [more ▼]

In the study of the stoichiometric relationship between autotrophs and herbivores, attention has been largely focused on effects of the encountered mismatch between needs and supplies of an element on herbivore growth and ecosystem processes. Herbivore adaptation to poor food quality has rarely been investigated. This study presents a predictive model of feeding, assimilation, digestion and excretion of Daphnia facing a dietary deficiency in phosphorus. Biochemical compounds in the food were divided into phosphorous and non-phosphorus compounds. It was assumed that Daphnia is able to differently assimilate both types of compounds by regulation of target specific digestive enzymes. Feeding rate was regulated by optimal gut residence time of food particles, and assimilation efficiency by gut residence time and optimal secretion of both classes of gut enzymes. The model predicted the optimal strategy for a consumer facing an elementally imbalanced diet: (1) increase the ingestion rate, and (2) increase the secretion rate of both classes of gut enzymes. It resulted in decreased C and nutrient assimilation efficiencies, increased C feeding costs, and reduced growth rate. Sensitivity analysis showed that these predictions were qualitatively not influenced by parameter values. An alternative model was tested that includes an additive term allowing the direct excretion of C assimilated in excess. Results showed that this strategy is not optimal for the consumer growth rate. In conclusion, the model supports the hypothesis that carbon ingested in excess may generate energy that can be used to obtain more nutrients by increased feeding rate. [less ▲]

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See detailLa fin d'une époque...?
Choffray, Jean-Marie ULg

E-print/Working paper (2013)

Il est des moments exceptionnels dans la vie qui rappellent les lignes de fracture de l’histoire. C’est, peut-être, ce que notre monde moderne vit aujourd’hui. Dans ce document, et avant que nous ne ... [more ▼]

Il est des moments exceptionnels dans la vie qui rappellent les lignes de fracture de l’histoire. C’est, peut-être, ce que notre monde moderne vit aujourd’hui. Dans ce document, et avant que nous ne vivions ce qui pourrait être un printemps, ou un automne « chaud », il m’a paru utile de mettre un peu d’ordre dans mes observations sur « L’air du temps. » Pas d’autre ambition pour ce texte, donc, que de chercher à comprendre les événements passés, et de prendre date sur les nuages qui s’amoncellent ! [less ▲]

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See detailFin de colonie, bricolages du développement. René Clémens et la mobilisation des universitaires liégeois au Katanga dans les années 1955-1960
Poncelet, Marc ULg

Conference (2013, October 18)

From 1955 to 1963 members of University of Liège have been committed in sociological and political interventions in social development in the south urban Katanga. René Clemens was pioneer in sociological ... [more ▼]

From 1955 to 1963 members of University of Liège have been committed in sociological and political interventions in social development in the south urban Katanga. René Clemens was pioneer in sociological field and was also leader of the social interventions in Katanga. [less ▲]

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See detailLa fin de l’interdiction légale
Kellens, Georges ULg; Seron, Vincent ULg

in Verbruggen, Frank; Verstraeten, Raf; Van Daele, Dirk (Eds.) et al Strafrecht als roeping – Liber Amicorum Lieven Dupont (2005)

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See detailLa fin de l'UEO et l'avenir de l'interparlementarisme
Dumoulin, André ULg

in Revue Défense nationale (2011), (741), 161-172

Une organisation, 'UEO disparaît, qui a joué un rôle décisif dans plusieurs périodes de l'élaboration de la communauté de destin et d'intérêts de l'Euope. Abordant résolument les questions de sécurité et ... [more ▼]

Une organisation, 'UEO disparaît, qui a joué un rôle décisif dans plusieurs périodes de l'élaboration de la communauté de destin et d'intérêts de l'Euope. Abordant résolument les questions de sécurité et de défense, elle laisse derrière elle un héritage utile qui a servi l'actuelle PSDC et quelques convulsions mais laisse orphelin le parlementarisme européen. [less ▲]

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See detailLa fin de la Belgique ou la fin du modèle régionaliste
Hermans, Michel ULg

Conference (2004, December 13)

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See detailLa fin de la linéarité du dialogue didactique ?
Vromans, Joseph ULg

Conference (1996, May 09)

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See detailLa fin de la récréation pour l'opérateur historique? Annotation de la décision du Conseil de la concurrence dans l'affaire Belgacom/Scarlet, 7 novembre 2008
Petit, Nicolas ULg; Daems, Ief

in revue de la concurrence belge (2009), (3),

Le Conseil belge de la concurrence a décidé de subordonner l'autorisation de la concentration entre Belgacom et Scarlet à la mise en oeuvre de diverses mesures correctives structurelles et ... [more ▼]

Le Conseil belge de la concurrence a décidé de subordonner l'autorisation de la concentration entre Belgacom et Scarlet à la mise en oeuvre de diverses mesures correctives structurelles et comportementales. [less ▲]

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See detailFin de la traversée du désert pour les Fennecs
Cormann, Grégory ULg

Article for general public (2009)

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See detailLa fin de la vie en médecine intensive
Ferdinande, P.; Berré, J.; Colardyn, F. et al

in Réanimation (2001), 10

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See detailFin de législature: le point sur l'autonomie fiscale des communautés et des régions
Bourgeois, Marc ULg

in Comptabilité et Fiscalité Pratiques (2003)

Detailed reference viewed: 33 (22 ULg)