Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
See detailAn Energy-Dissipative Momentum-Conserving Time Integration Algorithm for Viscoplastic Hyperelastic Models Based on the Variational Updates Framework
Noels, Ludovic ULg; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

(2007)

Traditional time integration algorithms for finite-element discretization are numerically stable only for linear models. To overcome that drawback, a new class of "Energy Momentum Conserving Algorithms ... [more ▼]

Traditional time integration algorithms for finite-element discretization are numerically stable only for linear models. To overcome that drawback, a new class of "Energy Momentum Conserving Algorithms" or EMCA and ``Energy-Dissipative Momentum-Conserving'' or EDMC algorithms, verifying the conservation/dissipation laws in the non-linear range, was recently developed. They consist in a mid-point scheme with an adequate evaluation of the internal forces, which strongly assume the existence of an energy potential. Following the variational visco-plastic constitutive updates formalism, a general energy-dissipative momentum-conserving algorithm for hyperelastic-based formulation is proposed. The main feature of this variational formulation is that the stress tensor always derives from an incremental potential, even if plastic deformations occur, allowing to use it in the above integration algorithms. [less ▲]

Detailed reference viewed: 40 (7 ULg)
Full Text
Peer Reviewed
See detailEnergy-Efficient Sensor Selection for Data Quality and Load Balancing in Wireless Sensor Networks
Bijarbooneh, Farshid; Du, Wei ULg; Ngai, Edith et al

in IEEE 22nd International Symposium of Quality of Service (IWQoS), Hong Kong, 2014 (2014)

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailEnergy-flux relationship in the FUV Jovian aurora deduced from HST-STIS spectral observations
Gustin, Jacques ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

in Journal of Geophysical Research. Space Physics (2004), 109(A10),

[1] Far ultraviolet spectral observations of the Jovian aurora have been made since 1997 with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope at low spectral resolution ... [more ▼]

[1] Far ultraviolet spectral observations of the Jovian aurora have been made since 1997 with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope at low spectral resolution. The combination of the spectral resolution with the intensity variation along the STIS slit provides information on the latitudinal variation of the precipitating auroral electron energy flux and the mean electron energy, from which the electron current density at the top of the atmosphere can also be deduced. It is found that the mean electron energies associated with the main oval lie in the range 30 - 200 keV and show a tendency to increase with the precipitating energy flux. The current densities lie in the range similar to 0.04 - 0.4 muA m(-2), consistent with previous estimates, and are also positively correlated with the energy flux. The observed relationship between the auroral time-integrated energy fluxes and the electron energies in the main oval is compatible with that expected from Knight's theory of field-aligned currents. The best agreement between the observed data and the Knight curves is obtained for an electron temperature of T-e = 2.5 keV and a source density N = 0.003 cm(-3), that is within the range of values observed in the equatorial plane during the Voyager flybys. No systematic dependence of the electron energy with magnetic local time is found, but the morning sector around 0800 MLT shows greater variability than other regions of the oval. Analysis of time-tagged data shows that the main oval energy flux usually varies steadily over the several minute intervals of observation and that the mean electron energy usually undergoes correlated variations such that the current density remains relatively constant. It is shown that these overall properties are also consistent with Knight's theory of auroral electron acceleration associated with field-aligned current flow, from which it is inferred that the temporal variations observed are often due to slow changes in the magnetospheric "source'' electron parameters in the presence of near-steady magnetosphere-ionosphere coupling currents. By contrast, time-integrated emissions in the polar region are found to be associated with similar mean electron energies to the main oval but with typically smaller energy fluxes and current densities. Pressure balance arguments are advanced, which indicate that the brighter of these emissions must be associated with an auroral acceleration mechanism perhaps similar to that operative in the main oval, while it remains possible that the weaker emissions could result from precipitation from a quasi-isotropic hot magnetospheric electron source. [less ▲]

Detailed reference viewed: 14 (5 ULg)
Full Text
Peer Reviewed
See detailAn energy-momentum conserving algorithm for non-linear hypoelastic constitutive models
Noels, Ludovic ULg; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

in International Journal for Numerical Methods in Engineering (2004), 59(1), 83-114

This paper presents an extension of the energy momentum conserving algorithm, usually developed for hyperelastic constitutive models, to the hypoelastic constitutive models. For such a material no ... [more ▼]

This paper presents an extension of the energy momentum conserving algorithm, usually developed for hyperelastic constitutive models, to the hypoelastic constitutive models. For such a material no potential can be defined, and thus the conservation of the energy is ensured only if the elastic work of the deformation can be restored by the scheme. We propose a new expression of internal forces at the element level which is shown to verify this property. We also demonstrate that the work of plastic deformation is positive and consistent with the material model. Finally several numerical applications are presented. Copyright (C) 2003 John Wiley Sons, Ltd. [less ▲]

Detailed reference viewed: 35 (5 ULg)
Peer Reviewed
See detailEnergy-transfer phenomena and dissociation processes in electronically excited molecules
Lorquet, Jean-Claude ULg; Elkomoss, S. G.; Magee, J. L.

in Journal of Chemical Physics (1962), 37(9), 1991-2000

This paper is an extension of previous work by Magee and Funabashi on the influence of electronic coupling on dissociation mechanisms. The same model (linear chain of diatomic molecules) has again been ... [more ▼]

This paper is an extension of previous work by Magee and Funabashi on the influence of electronic coupling on dissociation mechanisms. The same model (linear chain of diatomic molecules) has again been considered. The use of a dynamical version of the Hellmann-Feynman theorem allows the development of a unified treatment valid for any coupling. An application to an infinite linear chain of hydrogen moleculeions is made, and the following results are found: (1) In the weak-coupling case, immediate dissociation occurs. (2) In the intermediate case, the electronic excitation energy is converted into vibrational energy, mainly localized on the molecule initially excited. Redistribution of the vibrational energy then occurs. (3) In the strong-coupling case, dissociation does not occur. Many molecules vibrate with comparable amplitudes. Short chains, containing two, three, four, and seven molecules, are also considered. For these it is found that two or more dissociations usually occur regardless of the type of coupling and initial position of the excitation. Finally, an application to intramolecular energy transfer is attempted. The case of the radiation induced isomerization of cis-polybutadiene into its trans isomer, studied by Golub, is examined. With certain restrictions, our results can be considered as supporting Golub's views. [less ▲]

Detailed reference viewed: 14 (0 ULg)
See detailL’enfance comme champ d’intervention politique au Burkina Faso
Wouango, Joséphine ULg

Conference (2008, November 21)

Detailed reference viewed: 11 (0 ULg)
See detailEnfance et cinéma
Tomasovic, Dick ULg

Conference given outside the academic context (2008)

Detailed reference viewed: 12 (3 ULg)
See detailEnfance et politique chez Spinoza
Herla, Anne ULg

Scientific conference (2006, May 19)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailEnfance et sexualité
Mormont, Christian ULg

Article for general public (1997)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailL'enfance volée de Kinshasa
Melice, Anne ULg

in Espace de Libertés : Magazine du Centre d'Action Laïque (2007), 349

Detailed reference viewed: 183 (7 ULg)
See detailEnfance, culture, morale. Autour de Sartre lecteur et relecteur d’Alain
Cormann, Grégory ULg

Conference (2012, September 11)

Detailed reference viewed: 17 (5 ULg)
Peer Reviewed
See detailEnfance, transmission et individualisation. Le cas des enfants mineurs du Katanga (RDC)
Andre, Géraldine ULg; Godin, Marie; Mrsic-Garac, Sonia

Conference (2008, July)

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailL’enfant (et le) sauvage : entre "L’Idiot de la famille" de Sartre et "La Pensée sauvage" de Lévi-Strauss
Cormann, Grégory ULg

in Phainomenon : Revista de Fenomenologia (2006)

Detailed reference viewed: 77 (7 ULg)
Full Text
See detailL'enfant : sujet ou objet social ?
Durand, Pascal ULg

Article for general public (1997)

Entretien avec Bernadette Bawin, sociologue.

Detailed reference viewed: 29 (1 ULg)
Full Text
See detailL'enfant bâtard des Lumières : L'histoire foucaldienne de la prison
Brausch, Géraldine ULg

in Observatoire : Revue d'Action Sociale & Médico-Sociale (2010), n°66

Detailed reference viewed: 48 (9 ULg)
Full Text
Peer Reviewed
See detailL'enfant dans l'Égypte gréco-romaine
Marganne, Marie-Hélène ULg

in Revue de Pédiatrie (La) (1999), 30(298-7), 30-37

Detailed reference viewed: 19 (3 ULg)
Full Text
See detailL'enfant dans l'Égypte gréco-romaine
Marganne, Marie-Hélène ULg

Scientific conference (2004)

Detailed reference viewed: 28 (8 ULg)
Full Text
See detailL'enfant dans tout ça? De l'avis à l'accord de l'enfant ! Quel mandat pour l'avocat?
Gerin, Corinne ULg

in Bihain, Luc (Ed.) Aide à la jeunesse. Bilan & Perspectives 1991-2011 (2011)

Detailed reference viewed: 31 (6 ULg)
Full Text
Peer Reviewed
See detailL’enfant dieu selon Savitzkaya
Demoulin, Laurent ULg; Demoulin, Christian

in La Clinique lacanienne (2006), 10

Présentation de l'oeuvre d'Eugène Savitzkaya et de la place qu'elle accorde à l'enfance et analyse psychanalytique de la description de ce "nouveau rapport à l'enfance".

Detailed reference viewed: 31 (1 ULg)
See detailL'enfant en institution
Born, Michel ULg

in Dossiers de l'A C T I F (1980), 3

Detailed reference viewed: 30 (1 ULg)