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Peer Reviewed
See detailEndurance training versus combined strength and endurance training in leisure-time cyclists
Weiler, B.; Urhausen, A.; Dahm, C. et al

in International Journal of Sports Medicine (1999, October), 20

Detailed reference viewed: 15 (3 ULg)
See detailENEAS: the European Network of Excellence in AsteroSeismology
Aerts, C.; Baglin, A.; Christensen-Dalsgaard, J. et al

in Favata, F.; Aigrain, S.; Wilson, A. (Eds.) Second Eddington Workshop: Stellar structure and habitable planet finding, 9 - 11 April 2003, Palermo, Italy (2004, January 01)

Asteroseismology is one of the major important science topics in astrophysics in the coming decade. Several recent breakthroughs have indeed been made in Europe in this field. The observational data will ... [more ▼]

Asteroseismology is one of the major important science topics in astrophysics in the coming decade. Several recent breakthroughs have indeed been made in Europe in this field. The observational data will improve significantly in the near future, as upgraded ground-based instruments are being built and two European asteroseismic space missions are planned for launch between 2005 and 2008. They will provide us for the first time with ultra-high-accuracy, high-temporal resoluton data from space for stars other than the Sun. A successful asteroseismic study involves many different steps, from state-of-the-art raw data treatment to theoretical physical modelling of the oscillation frequencies. Our network is set up to meet the needs of combining and exchanging the different expertises of the participating institutes, of training PhD students and of both training and exchanging post-doctoral researchers. This will guarantee the most fruitful and efficient exploitation of the very substantial investments that are being made in Europe in future observations of stellar oscillations, strengthening Europe's leading position in this research field. Also, it will be a test-bed for the development of efficient procedures for collaboration across the internet, involving a vast range of procedures and skills, as well as extensive common use of a broad variety of data. Furthermore, procedures will be incorporated for the joint training of students, which is an essential part of our project. [less ▲]

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See detailL'Enéide des papyrus. Le destin d'une oeuvre littéraire en Egypte gréco-romaine
Rochette, Bruno ULg

Master's dissertation (1987)

Detailed reference viewed: 22 (3 ULg)
Peer Reviewed
See detailEnergetic and conformational study of four benzylimidazole compounds with alpha 2 agonist profile: The mivazerol and three methylated derivatives
Vancampenhout, Nathalie; Dive, Georges ULg; Dehareng, Dominique ULg

in International Journal of Quantum Chemistry (1996), 60(4), 911-930

The mivazerol and three of its methylated derivatives are studied at the ab initio SCF level within the MINI-1 and 6-31G basis sets. This study aimed at determining some probable conformations, either ... [more ▼]

The mivazerol and three of its methylated derivatives are studied at the ab initio SCF level within the MINI-1 and 6-31G basis sets. This study aimed at determining some probable conformations, either neutral or protonated, that could interact with the alpha 2 adrenoceptors. The solvent effect was also studied within the Onsager's solvent model at the two dielectric constant (epsilon) values of 4 and 80. The interaction with the environment (either solvent or receptor) is schematically studied by positioning either two water molecules or one formamide or/and one formic add near the amide and the imidazole for few isomers. The medium polarization, through epsilon, and the solvation effect, through the interaction with the solvent molecules or the receptor side chains, stabilize the same isomers. Post-SCF calculations are performed at the CISD level, the first excited singlet and triplet states energies are determined, and the question of the wave-function stability is addressed. The results indicate the probability of a spin-orbit coupling with the first excited triplet state, thus opening the question of such a possibility within an enzyme active site. (C) 1996 John Wiley & Sons, Inc. [less ▲]

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See detailEnergetic and Environmental Aspects of a Diesel Engine Using Rapeseed Oil as Fuel
Christiaens, Sébastien; Bruylants, Grégory; Ngendakumana, Philippe ULg

in 19th International Conference on Efficiency, Cost, Optimization , Simulation and Environmental Impact of Energy Systems (ECOS 2006) (2006, July)

This paper describes the experiment that was carried out at the Thermodynamics Laboratory of the University of Liège (Belgium) to study the impact of the use of vegetable oil as a substitute for light oil ... [more ▼]

This paper describes the experiment that was carried out at the Thermodynamics Laboratory of the University of Liège (Belgium) to study the impact of the use of vegetable oil as a substitute for light oil on the short-term performance of Diesel engines for cars. The vegetable oil selected is derived directly from rapeseed without any refinement processes. Five tests were carried out, going from 0% rapeseed oil blended in conventional Diesel fuel (reference fuel) up to 100% rapeseed oil. For each test, the whole operating range of the engine was swept and the fuel consumption and exhaust emissions measured simultaneously. The study concludes that the engine used during the research can be run with 100% unrefined rapeseed oil. Nevertheless, using 100% oil is not considered as a valid large scale solution. However, using a smaller percentage of rapeseed oil gives promising results in terms of reduction of CO2 emission as well as reduction of the opacity of the exhaust gases. [less ▲]

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See detailEnergetic approach for the characterization of taps in granular compaction
Ludewig, François ULg; Dorbolo, Stéphane ULg; Gilet, Tristan ULg et al

in Europhysics Letters [=EPL] (2008), 84(4),

We report numerical investigations for the compaction dynamics of dense granular assemblies. The studies are based on the non-smooth contact dynamics model. Our work suggests that the dimensionless ... [more ▼]

We report numerical investigations for the compaction dynamics of dense granular assemblies. The studies are based on the non-smooth contact dynamics model. Our work suggests that the dimensionless acceleration parameter Gamma, used by a large majortiy of authors, is not appropriate for rescaling the data. We prove that the dimensionless energy Xi, injected in the granular system at lift-off, is more appropriate and leads to robust interpretations of the compaction dynamics. Indeed, the injected energy allows to pass energy barriers that separate local equilibrium states. Using the Eyring picture of relaxation dynamic, we show that the consideration of Xi leads to a new law for compaction. [less ▲]

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See detailEnergetic Aspects of Non-Radial Solar-Like Oscillations in Red Giants
Dupret, Marc-Antoine ULg; Belkacem, Kevin; Montalbán, Josefina et al

in Astrophysics and Space Science Proceedings (2012)

The non-radial oscillations discovered by CoRoT (see e.g. de Ridder et al. (2009)) and by Kepler(see e.g. Bedding et al. (2010)) in thousands of red giants constitute a wonderful mine of information to ... [more ▼]

The non-radial oscillations discovered by CoRoT (see e.g. de Ridder et al. (2009)) and by Kepler(see e.g. Bedding et al. (2010)) in thousands of red giants constitute a wonderful mine of information to determine their global characteristics and probe their internal structure. A. Miglio and J. Montalbán have presented in detail in this conference the seismic structure of red giants, the information hold by their oscillation frequencies, and how it can be used. An adiabatic analysis of the oscillations was sufficient at this level as the frequencies are mainly determined by the deep layers were the oscillatons are quasi-adiabatic. We consider here energetic aspects of non-radial oscillations in red-giants. Non-adiabatic models of solar-like oscillations are required to determine the theoretical amplitude and lifetimes of the modes. These parameters allow us to determine how power spectra are expected to look like, depending on the structure of the red giant. Comparison with the observed measures gives thus additional constraints on the models. [less ▲]

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See detailEnergetic effects in classical pulsators
Dupret, Marc-Antoine ULg; Grigahcène, A.; Théado, S. et al

in Proceedings of SOHO 18/GONG 2006/HELAS I, Beyond the spherical Sun (2006, October 01)

Not Available

Detailed reference viewed: 7 (1 ULg)
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See detailEnergetic ion composition during reconfiguration events in the Jovian magnetotail
Radioti, Aikaterini ULg; Woch, J.; Kronberg, E. A. et al

in Journal of Geophysical Research. Space Physics (2007), 112(A6),

[1] On the basis of the first 15 orbits of the Galileo spacecraft the composition of the energetic ion population of the Jovian magnetosphere is studied on a global scale. Analyzing data from the ... [more ▼]

[1] On the basis of the first 15 orbits of the Galileo spacecraft the composition of the energetic ion population of the Jovian magnetosphere is studied on a global scale. Analyzing data from the energetic particles detector onboard Galileo, we study the relative ion abundance ratios of S/O, S/He, O/He and p/He at various energy/ nucleon values. Prominent enhancements of S/O, S/He, and O/He abundance ratios are observed in the predawn sector and are associated with substorm-like events in the Jovian magnetotail. During these reconfiguration events, frequent small-scale variations of the south-north component of the magnetic field are present. Acceleration by such magnetic field variations is examined as a possible mechanism for particle energization in that region. When the timescale of the magnetic field variation is comparable to the particle gyro period, the particle is accelerated by the induced electric field. It is shown that, during the Jovian substorm-like events, the heavier ions are more efficiently energized than the lighter leading to the observed ion abundances. Ion composition measurements in other parts of the magnetosphere have shown quasiperiodic 3-day modulations suggesting that the internally driven processes affect the ion composition in the whole magnetosphere. [less ▲]

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See detailEnergetic oxygen atoms in the polar geocorona
Shematovich, V. I.; Bisikalo, D. V.; Gérard, Jean-Claude ULg

in Journal of Geophysical Research. Space Physics (2006), 111

The role of the auroral sources induced by the electron and proton precipitation in the formation of the hot oxygen corona in the polar upper atmosphere is studied. It is found that both electron ... [more ▼]

The role of the auroral sources induced by the electron and proton precipitation in the formation of the hot oxygen corona in the polar upper atmosphere is studied. It is found that both electron precipitation through exothermic chemistry and proton precipitation through atmospheric sputtering significantly contribute to the population of the hot oxygen geocorona. It is also found that only atmospheric sputtering results in the formation of the escape flux of energetic oxygen atoms, providing an important source of heavy atoms for the magnetosphere. The exothermic chemistry induced by the electron precipitation and/or by the absorption of the solar UV radiation is operating continuously in the polar upper atmosphere and results in a steady population of the very near-Earth environment by suprathermal oxygen atoms with energies below a few eV. By contrast, atmospheric sputtering by magnetospheric protons provides a more variable contribution, strongly coupled with the cusp region. It produces the more energetic oxygen atoms that populate the external regions of the hot oxygen geocorona. The results of calculations are in a good agreement with the analysis of the low-latitude perigee Low Energy Neutral Atom (LENA) images showing that the instrument signal consists of low to medium energy (5-30 eV) oxygen atoms produced in and near the cusp region. The more energetic (>30 eV) fraction of energetic oxygen atoms produced by the ion-induced atmospheric sputtering could be responsible for the energetic neutrals observed by the instrument far away from the cusp or oval regions. The total escape flux of oxygen atoms associated with atmospheric sputtering by protons is found about 8 × 10[SUP]23[/SUP] s[SUP]-1[/SUP] therefore this mechanism may provide a substantial contribution to the magnetospheric oxygen population. [less ▲]

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See detailThe energetic state of mitochondria modulates complex III biogenesis through the ATP-dependent activity of Bcs1.
Ostojić, Jelena; Panozzo; Lasserre, JP et al

in Cell Metabolism (2013), 18/4

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See detailEnergetic systems evaluation using Life Cycle Assessment
Belboom, Sandra ULg; Léonard, Angélique ULg

Scientific conference (2012, February 08)

Detailed reference viewed: 38 (10 ULg)
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See detailEnergetical aspects of solar-like oscillations in red giants
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg

Conference (2013, August 23)

CoRoT and Kepler observations of red giants reveal a large variety of spectra of non- radial solar- like oscillations. Up to now we understood pretty well the frequency patterns for the different global ... [more ▼]

CoRoT and Kepler observations of red giants reveal a large variety of spectra of non- radial solar- like oscillations. Up to now we understood pretty well the frequency patterns for the different global properties or different evolutionary stages of the stars. Here we are interested in the theoretical predictions for the two other components of a power spectra (the linewitdths and the heights). The study of energetic aspects of these oscillations is of great importance to predict the peak parameters in the power spectrum. I will discuss under which circumstances mixed modes are detectable for a large variety of red-giant stellar models, with emphasis on the effect of the evolutionary status of the star along the red-giant branch, for a wide range of stellar masses (from 1 to 2M⊙ ) on theoretical power spectra. [less ▲]

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See detailEnergetical aspects of solar-like oscillations in red giants
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg; Belkacem, Kevin et al

in Proceedings IAU Symposium No. 301, 2013 (in press)

Detailed reference viewed: 9 (0 ULg)
See detailL'énergie de chauffage et de climatisation en ville
Marique, Anne-Françoise ULg

Master's dissertation (2002)

Detailed reference viewed: 30 (2 ULg)
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See detailL'énergie de la participation est-elle renouvelable ? La production de scénarios énergétiques et ses malentendus
Claisse, Frédéric ULg; Italiano, Patrick ULg

in Claisse, Frédéric; Laviolette, Catherine; Reuchamps, Min (Eds.) et al La participation en action (2012, June 22)

Financé dans le cadre du programme de recherche fédéral sur le développement durable, le projet SEPIA avait pour but « d’examiner la faisabilité d’une analyse de durabilité intégrée (integrated ... [more ▼]

Financé dans le cadre du programme de recherche fédéral sur le développement durable, le projet SEPIA avait pour but « d’examiner la faisabilité d’une analyse de durabilité intégrée (integrated sustainability assessment, ISA) du système énergétique belge et d’en débattre avec les représentants de groupes sociaux. » SEPIA illustre le « tournant réflexif » pris ces dernières années par l’approche des nouveaux risques technologiques et environnementaux, lesquels mettraient à l’épreuve les découpages scientifiques traditionnels et imposeraient un mode de gestion publique intégrée, prenant en compte différentes disciplines et cadres cognitifs, dans un contexte d’incertitudes multiples, scientifiques et politiques. Dans cette perspective, le défi de la transition énergétique impliquerait de réinventer des processus délibératifs qui fassent davantage appel à la participation et au dialogue entre société civile, société politique et experts scientifiques. Projet à l’architecture complexe et multidimensionnelle, SEPIA associait une approche experte et une dimension participative, avec une cascade de processus de traitement de données. Dans ses aspects participatifs, SEPIA devait aboutir à la construction de scénarios énergétiques, élaborés par un premier panel d’experts et d’acteurs dans le domaine de l’énergie. La méthode prospective adoptée était celle du backcasting : un futur souhaitable est préalablement posé, obligeant à s’interroger sur les mesures et les étapes nécessaires pour y parvenir et relier ce futur au présent. L’exercice consistait, pour les participants à ce panel, à imaginer des scénarios contrastés permettant à la Belgique de se conformer, à l’horizon 2050, à un ensemble contraignant de huit objectifs de développement durable, dont celui de réduire de 80 % les émissions de gaz à effets de serre. Ces scénarios devaient ensuite être modélisés grâce à un logiciel de simulation énergétique selon les seuils et paramètres identifiés par les experts. Un second panel, composé d’acteurs concernés, était alors chargé d’évaluer les scénarios selon une approche normative multi-critères. Enfin, le résultat de cette évaluation devait être encore retraité par un autre logiciel pour le soutien à la décision en groupe, selon une méthodologie basée sur la logique floue. Un tel souci, indissociablement méthodologique et normatif, d’interroger aussi bien des experts que des groupes sociaux concernés par la problématique, ne va pas sans malentendus quant à la nature même de la participation. Ce sont ces malentendus que notre communication se propose d’interroger. La participation avait-elle un objectif précis en termes de résultats ou était-elle une finalité en soi ? L’évaluation des scénarios devait-elle être centrée sur la désirabilité ou sur la probabilité ? Quelles compétences déterminées devait-on mobiliser autour de la table, sachant que la liste de variables à prendre en compte est potentiellement infinie ? Comment les participants, experts ou stakeholders, s’accommodent-ils d’un design de recherche aussi complexe ? La participation au processus est-elle en soi une gratification ou d’autres incitants sont-ils nécessaires pour mobiliser des expertises de haut niveau ? Ces malentendus ne sont pas propres à SEPIA : ils sont au cœur de tout dispositif de recherche dès lors qu’il s’agit d’associer une réflexion méthodologique à un impératif de participation. [less ▲]

Detailed reference viewed: 30 (11 ULg)
See detailL'énergie en Wallonie et dans le monde. Mieux appréhender les enjeux pour mieux choisir
Merenne-Schoumaker, Bernadette ULg; Vauchel, Bernadette ULg

Book published by Ministère de la Région Wallonne, Administration de l'Energie (1989)

Dossier de sensibilisation aux problèmes de l'énergie en mettant l'accent sur la consommation dans la vie quotidienne et le rôle de chacun comme consommateur

Detailed reference viewed: 19 (9 ULg)