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
Peer Reviewed
See detailExtension of the Liège Intra Nuclear Cascade model to light ion-induced collisions for medical and space applications
Leray, S.; Mancusi, D.; Kaitaniemi, P. et al

in Journal of Physics: Conference Series (2013), 420

Detailed reference viewed: 15 (7 ULg)
Full Text
See detailExtension of the Liège Intranuclear Cascade Model to the 2-15 GeV Incident Energy Range
Pedoux, Sophie ULg

Doctoral thesis (2011)

The Liège Intra-Nuclear Cascade model (INCL4) has been shown to be quite successful for the description of spallation reactions. However its validity domain is limited to an upper incident energy of ~2 ... [more ▼]

The Liège Intra-Nuclear Cascade model (INCL4) has been shown to be quite successful for the description of spallation reactions. However its validity domain is limited to an upper incident energy of ~2 GeV, because inelastic elementary processes are restricted to the excitation and de-excitation of the Delta resonance. In this thesis, the INCL4 model is extended to higher incident energy. This is realised by including other inelastic elementary collisions, direct multipion production in elementary nucleon-nucleon and pion-nucleon collisions. This is somehow opposite to the usual extension to high energy of such models, as it is usually realised by including excitation of heavier baryonic resonances. Experimental data and isospin symmetry have been exploited in the implementation of multipion channels, but we could not avoid to introduce specific models for the energy-momentum and charge repartition on the final pions. The predictions of the modified model for production of protons, neutrons and charged pions by proton and pion beams off nuclei are compared with experimental data. A short study on nuclear fragmentation is also presented. [less ▲]

Detailed reference viewed: 40 (6 ULg)
Full Text
See detailExtension of the long-term total column time series of atmospheric methane above the Jungfraujoch station: analysis of grating infrared spectra between 1976 and 1989
Bader, Whitney ULg; Lejeune, Bernard ULg; Demoulin, Philippe ULg et al

in Geophysical Research Abstracts (2011), 13

Methane (CH4) is one of the most abundant greenhouse gases in the Earth’s atmosphere, with current mean volume mixing ratio close to 1800 ppb. Since methane has a global warming potential of 25 (100-yr ... [more ▼]

Methane (CH4) is one of the most abundant greenhouse gases in the Earth’s atmosphere, with current mean volume mixing ratio close to 1800 ppb. Since methane has a global warming potential of 25 (100-yr horizon) and an atmospheric lifetime of 12 years, the Kyoto Protocol has included it among the species to be regulated to limit global warming. Anthropogenic sources of methane are mainly energy production (coal and leaks) and agriculture while main natural sources are swamps and biomass waste. The main sink of methane is oxidation in the troposphere, primarily by reaction with the hydroxyl radical. Methane trends have exhibited significant changes during the last twenty-five years. For instance, long-term monitoring of its vertical total column above the high-altitude station of the Jungfraujoch (46.5°N, 8°E, 3580 m asl) has indeed allowed to derive column changes ranging from +0.72% in 1987-1988 to +0.14% in 1999-2000 (Zander et al., 2002), relative to 1988 and 2000, respectively. More recently and for the same site, Duchatelet et al. (2010) have even reported a significant slowdown of -0.02%/yr between years 2000 and 2005. This study also showed that since then, CH4 is on the rise again, at a rate close to +0.30%/yr. While the numbers reported here above have been derived from the Fourier Transform Infrared (FTIR) data set starting in 1984, earlier pioneering observations have been collected at the Jungfraujoch since 1950, using grating spectrometers. During the 1958-1975 period, the main objectives has been the study of the solar photosphere in the visible and the near infrared and the publication of high-resolution solar atlases. From 1976 to 1989, narrow-band IR solar absorption observations achieving a spectral resolution of about 0.02 cm-1 have been recorded with the high-performance double-pass grating spectrometer. Analysis of these historical spectra provides a unique opportunity to extend the Jungfraujoch’s total column time series of important atmospheric gases, including methane, by nearly 10 years. The aim of this contribution is to present the inversion strategy adopted to derive CH4 from the grating spectra, using the SFIT-2 algorithm (v3.91) We will evaluate the impact of resolution, spectroscopic parameters (from the EU HYMN project -see www.knmi.nl/samen/hymn-, and from HITRAN 2004), atmospheric pressure and temperature profiles on the error budget. The 1976-1989 total column time series produced will be presented and critically discussed. In particular, we will identify and correct for possible biases between double-pass grating spectrometer measurements and more recent FTIR total columns. The harmonized and consolidated time series will be investigated to characterize the long-term trend of methane for the 1976-2010 time period. Comparisons with synthetic data produced by the CHASER 3-dimensional chemical transport model will also be presented and analyzed. [less ▲]

Detailed reference viewed: 292 (43 ULg)
Full Text
Peer Reviewed
See detailExtension of the Marchenko equation to non-Hermitian differential systems
Coz, Marcel; Rochus, Pierre ULg

in Annals of Physics (1980), 126(2), 460-499

Detailed reference viewed: 23 (3 ULg)
Peer Reviewed
See detailAn extension of the radial return algorithm to account for rate-dependent effects in frictional contact and visco-plasticity
Ponthot, Jean-Philippe ULg

in Journal of Materials Processing Technology (1998), 80-1

This paper deals with unified elasto-plastic and elastic-visco-plastic constitutive equations for metals submitted to large deformations. We present here a newly developed time integration algorithm which ... [more ▼]

This paper deals with unified elasto-plastic and elastic-visco-plastic constitutive equations for metals submitted to large deformations. We present here a newly developed time integration algorithm which is an extension to the visco-plastic range of the classical radial return algorithm for plasticity. The resulting implicit algorithm is both efficient and very inexpensive. This algorithm is also subsequently extended to frictional problems where it allows a generalisation of the classical Coulomb dry friction criterion to a criterion depending on the relative slip velocity such as those encountered in the hydrodynamic regime. (C) 1998 Elsevier Science S.A. All rights reserved. [less ▲]

Detailed reference viewed: 37 (6 ULg)
Peer Reviewed
See detailAn Extension of the Radial Return Algorithm to Account for Visco- Plasticity and Rate-Dependent Effects in Frictional Contac
Ponthot, Jean-Philippe ULg

in Proceedings of "World Congress on Computational Mechanics IV" (1998)

Detailed reference viewed: 10 (0 ULg)
See detailAn extension of the Radial Return Scheme for Springback Similation in Sheet Metal Forming
GOHY, S.; Papeleux, Luc ULg; COLLARD, X. et al

in 6th ICTP-International Conference on Technology of Plasticity, Nuremberg (1999)

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailExtension of the Super-Elements Method to the Analysis of Oblique Collision Between Two Ships
Buldgen, Loïc ULg; Le Sourne, Hervé; Rigo, Philippe ULg

in Marine Structures (2012)

Extension of the Super-Elements Method to the Analysis of Oblique Collision Between Two Ships

Detailed reference viewed: 50 (8 ULg)
See detailExtensions and applications of a mid-term voltage stability analysis method
Van Cutsem, Thierry ULg; Jacquemart, Yannick; Marquet, Jean-Noël et al

in Proc. 3rd Intern. Workshop on Bulk Power system voltage phenomena : voltage stability and security (1994, August)

Detailed reference viewed: 37 (0 ULg)
Full Text
Peer Reviewed
See detailExtensions and restrictions of Wythoff's game preserving its P positions
Duchêne, Eric; Fraenkel, Aviezri; Nowakowski, Richard et al

in Journal of Combinatorial Theory - Series A (2010), 117

We consider extensions and restrictions of Wythoff's game having exactly the same set of P positions as the original game. No strict subset of rules give the same set of P positions. On the other hand, we ... [more ▼]

We consider extensions and restrictions of Wythoff's game having exactly the same set of P positions as the original game. No strict subset of rules give the same set of P positions. On the other hand, we characterize all moves that can be adjoined while preserving the original set of P positions. Testing if a move belongs to such an extended set of rules is shown to be doable in polynomial time. Many arguments rely on the infinite Fibonacci word, automatic sequences and the corresponding number system. With these tools, we provide new two-dimensional morphisms generating an infinite picture encoding respectively P positions of Wythoff's game and moves that can be adjoined. [less ▲]

Detailed reference viewed: 67 (15 ULg)
Full Text
See detailExtensions and restrictions of Wythoff's game preserving its P-positions
Rigo, Michel ULg

Scientific conference (2011, October 21)

Wythoff's game is a century old classical two players combinatorial game. When studying this game, Beatty sequences associated with the Golden Ratio, syntactical properties of the representations of ... [more ▼]

Wythoff's game is a century old classical two players combinatorial game. When studying this game, Beatty sequences associated with the Golden Ratio, syntactical properties of the representations of integers in the Fibonacci or Zeckendorf numeration system and the morphic Fibonacci word appear naturally in characterizations of its P-positions. Recall that whatever is the move played from a P-position, the other player has a winning strategy. Contrarily to the usual approach where one defines a new game by a set of rules and then tries to characterize the corresponding set of P-positions, our motivations are to proceed the other way around: keep the original set of P-positons while changing the rules. We consider extensions and restrictions of Wythoff's game having exactly the same set of P-positions as the original game. Our results are the following one: no strict subset of rules gives the same set of P-positions. On the other hand, we characterize all moves that can be adjoined while preserving the original set of P-positions. Testing if a move belongs to such an extended set of rules is shown to be done in polynomial time. In this talk, we won't consider many game theoretical aspects (but we will recall some basic facts on combinatorial games). We focus mainly on the role played by numeration systems, regular languages and bidimensional words generated by substitutions/morphisms. Indeed, games like this one provide nice interaction between combinatorics on words and combinatorial game theory. For instance, the set of P-positions of Wythoff's game are "coded" by the infinite Fibonacci word. Therefore, many arguments rely on this word, on automatic sequences and on the corresponding numeration systems. With these tools, we provide new bidimensional (shape-symmetric in the sense of Arnaud Maes) morphisms generating an infinite picture encoding respectively P-positions of Wythoff's game and moves that can be adjoined preserving the same set of P-positions. [less ▲]

Detailed reference viewed: 43 (7 ULg)
Peer Reviewed
See detailExtensions des techniques de reparation valvulaire mitrale: chirurgie de l'endocardite et des tumeurs valvulaires
Radermecker, M. A.; Gach, Olivier ULg; Henrottaux, G. et al

in Revue Médicale de Liège (2000), 55(10), 950-3

Mitral valve repair has demonstrated its superiority over valve replacement. Mitral valve repair constitutes the optimal therapeutic option in case of degenerative dystrophic, rheumatic, congenital or ... [more ▼]

Mitral valve repair has demonstrated its superiority over valve replacement. Mitral valve repair constitutes the optimal therapeutic option in case of degenerative dystrophic, rheumatic, congenital or ischemic mitral valve disease. These surgical techniques can also be successfully and advantageously applied in case of bacterial endocarditis or tumoral valvular disease. We report a case of staphylococcal endocarditis and another case of posterior leaflet fibroelastoma to show the place of conservative mitral surgery in these unusual indications. [less ▲]

Detailed reference viewed: 26 (2 ULg)
Full Text
Peer Reviewed
See detailLes extensions du fichier Mertens-Pack3 du CEDOPAL
Marganne, Marie-Hélène ULg

in Schubert, Paul (Ed.) Actes du 26e Congrès International de Papyrologie (2012, September)

Cataloguant au départ les notices des papyrus littéraires grecs et latins, à l'exclusion des papyrus d'Herculanum et des textes magiques, bibliques, juifs et chrétiens, le fichier Mertens-Pack3, qui est ... [more ▼]

Cataloguant au départ les notices des papyrus littéraires grecs et latins, à l'exclusion des papyrus d'Herculanum et des textes magiques, bibliques, juifs et chrétiens, le fichier Mertens-Pack3, qui est intégralement accessible en ligne depuis décembre 2005, s'étend progressivement à d'autres catégories de papyrus étudiés dans le cadre de recherches du CEDOPAL sur les mise en texte et contexte des papyrus grecs et latins. Aux notices des papyrus iatromagiques, disponibles en ligne depuis novembre 2004, succéderont progressivement celles des papyrus latins d'Herculanum, des lettres et textes scolaires chrétiens, des rapports médicaux et des lettres privées à caractère médical, etc., tandis que seront fournies toutes les bibliographies liminaires par auteur et par sous-genre, et que l'architecture de la base de données sera entièrement remaniée en vue d'optimiser les conditions tant d'encodage que de consultation. [less ▲]

Detailed reference viewed: 27 (5 ULg)
Full Text
See detailExtensions of Superalgebras of Krichever-Novikov type
Kreusch, Marie ULg

Poster (2013, April)

An explicit construction of central extensions of Lie superalgebras of Krichever-Novikov type is given. In the case of Jordan superalgebras related to the superalgebras of Krichever-Novikov type we ... [more ▼]

An explicit construction of central extensions of Lie superalgebras of Krichever-Novikov type is given. In the case of Jordan superalgebras related to the superalgebras of Krichever-Novikov type we calculate a 1-cocycle with coefficients in the dual space. [less ▲]

Detailed reference viewed: 39 (15 ULg)
Full Text
Peer Reviewed
See detailExtensions of superalgebras of Krichever-Novikov type
Kreusch, Marie ULg

in Letters in Mathematical Physics (2013), 103(11),

An explicit construction of central extensions of Lie superalgebras of Krichever-Novikov type is given. In the case of Jordan superalgebras related to the superalgebras of Krichever-Novikov type we ... [more ▼]

An explicit construction of central extensions of Lie superalgebras of Krichever-Novikov type is given. In the case of Jordan superalgebras related to the superalgebras of Krichever-Novikov type we calculate a 1-cocycle with coefficients in the dual space. [less ▲]

Detailed reference viewed: 64 (26 ULg)
Full Text
See detailExtensions of superalgebras of Krichever-Novikov type
Kreusch, Marie ULg

Conference (2013, January 15)

Detailed reference viewed: 26 (10 ULg)
Full Text
Peer Reviewed
See detailExtensions of system signatures to dependent lifetimes: Explicit expressions and interpretations
Marichal, Jean-Luc; Mathonet, Pierre ULg

in Journal of Multivariate Analysis (2011), 102

The concept of system signature was introduced by Samaniego for systems whose components have i.i.d. lifetimes. We consider its extension to the continuous dependent case and give an explicit expression ... [more ▼]

The concept of system signature was introduced by Samaniego for systems whose components have i.i.d. lifetimes. We consider its extension to the continuous dependent case and give an explicit expression for this extension as a difference of weighted means of the structure function values. We then derive a formula for the computation of the coefficients of these weighted means in the special case of independent continuous lifetimes. Finally, we interpret this extended concept of signature through a natural least squares approximation problem. [less ▲]

Detailed reference viewed: 12 (1 ULg)