References of "2005"
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See detailEchinoderm skeletons record sea temperatures
Ranner, Herwig; Ladrière, Ophélie ULg; Navez, Jacques et al

Poster (2005, December 31)

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See detailScenari del sé e monumenti in posa nella fotografia turistica
Dondero, Maria Giulia ULg

in Espressione/Contenuto : Rivista dell’Associazione Italiana di Studi Semiotici (2005, December 31)

Ce travail porte sur les pratiques touristiques dans les villes d’art, témoignées et textualisées dans la photographie d’amateur. Il étudie notamment les configurations textuelles que j’ai distinguées ... [more ▼]

Ce travail porte sur les pratiques touristiques dans les villes d’art, témoignées et textualisées dans la photographie d’amateur. Il étudie notamment les configurations textuelles que j’ai distinguées ainsi : 1) photo de monument, 2) photo de paysage urbain, 3) photo-panorama, 4) photo « en raccourci », 5) photo-journal intime. Ce catalogage vise à montrer les différentes manières d’inscription du corps et de l’identité (soi-idem et soi-ipse) du producteur et de l’observateur sur l’architecture et les espaces de la ville d’un côté, et sur le support photographique de l’autre. Ces configurations de points de vue ont été étudiées non seulement en relation entre elles, mais aussi en relation avec d’autres configurations textuelles, comme par exemple celles de la photo-souvenir de « paysage naturel », et en relation avec d’autres statuts sociaux de la photo, comme ceux du portrait de famille, du reportage de voyage dans la presse et du reportage « d’auteur ». [less ▲]

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See detailArchivi fotografici e forme di vita labirintiche
Dondero, Maria Giulia ULg

in Espressione/Contenuto : Rivista dell’Associazione Italiana di Studi Semiotici (2005)

Cet article porte sur les cours de Roland Barthes au Collège de France (1976-1980) et notamment sur un projet de séminaire sur des photographies chères à Marcel Proust et à Barthes lui-même. Cette étude ... [more ▼]

Cet article porte sur les cours de Roland Barthes au Collège de France (1976-1980) et notamment sur un projet de séminaire sur des photographies chères à Marcel Proust et à Barthes lui-même. Cette étude vise à démontrer que le projet de ce séminaire est exemplaire des derniers choix épistémologiques de Roland Barthes : l’éloignement du structuralisme et la tentative de constitution d’une « science du singulier ». La relecture des cours et séminaires de Barthes est d’autant plus importante aujourd’hui que la sémiotique de tradition structuraliste est en train de s’interroger sur ses fondements et sur son destin et – comme Barthes l’avait très bien montré – elle a besoin de coupler l’immanentisme textuel à l’analyse des pratiques interprétatives et expérientielles. [less ▲]

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See detailHandling Liveness Properties in (ω-)Regular Model Checking
Bouajjani, Ahmed; Legay, Axel; Wolper, Pierre ULg

in Electronic Notes in Theoretical Computer Science (2005, December 28), 138(3), 101-115

Since the topic emerged several years ago, work on regular model checking has mostly been devoted to the verification of state reachability and safety properties. Though it was known that liveness ... [more ▼]

Since the topic emerged several years ago, work on regular model checking has mostly been devoted to the verification of state reachability and safety properties. Though it was known that liveness properties could also be checked within this framework, little has been done about working out the corresponding details, and experimentally evaluating the approach. This paper addresses these issues in the context of regular model checking based on the encoding of states by finite or infinite words. It works out the exact constructions to be used in both cases, and solves the problem resulting from the fact that infinite computations of unbounded configurations might never contain the same configuration twice, thus making cycle detection problematic. Several experiments showing the applicability of the approach were successfully conducted. [less ▲]

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See detailControlled synthesis of an ABC miktoarm star-shaped copolymer by sequential ring-opening polymerization of ethylene oxide, benzyl beta-malolactonate, and epsilon-caprolactone
Rieger, Jutta ULg; Coulembier, Olivier; Dubois, Philippe ULg et al

in Macromolecules (2005), 38(26), 10650-10657

This paper reports on the synthesis of an amphiphilic miktoarm ABC star-shaped copolymer, s[(PEO)(PMLABz)(PCL)], consisting of biocompatible/bioresorbable arms. Indeed, PEO is a hydrophilic biocompatible ... [more ▼]

This paper reports on the synthesis of an amphiphilic miktoarm ABC star-shaped copolymer, s[(PEO)(PMLABz)(PCL)], consisting of biocompatible/bioresorbable arms. Indeed, PEO is a hydrophilic biocompatible poly(ethylene oxide) arm, PMLABz is a poly(benzyl beta-malolactonate) arm precursor of a pH-sensitive bioresorbable poly(beta-malic acid) block, and PCL is a hydrophobic bioresorbable poly(epsilon-caprolactone) arm. Each constitutive arm was prepared by ring-opening polymerization. A double-headed PEO macroinitiator [PEO-(OH)-COO-K+] was first prepared by selective hydrolysis of the alpha-lactone (2-oxepanone) end group of PEO chains end-capped by a omega-methoxy group. The anionic polymerization of benzyl beta-malolactonate (MLABz) was selectively initiated by the alpha-potassium carboxylate end group of PEO in the presence of 18-crown-6 ether. The polymerization of epsilon-caprolactone (epsilon-CL) was initiated by the hydroxyl group left at the junction of the two blocks of the as-prepared PEO-b-PMLABz diblock copolymer, in the presence of tin(II) bis(2-ethylhexanoate) (Sn(Oct)(2)). The macroinitiator, the intermediate diblock, and the final miktoarm. star-shaped copolymer were analyzed by H-1 NMR spectroscopy and size exclusion chromatography. [less ▲]

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See detailA mutliwavelength observational study of the non-thermal emission from O-type stars.
De Becker, Michaël ULg

Doctoral thesis (2005)

The present work is devoted to an observational multiwavelength study of the non-thermal emission of O-type stars. The non-thermal radio emission is believed to be synchrotron radiation, therefore ... [more ▼]

The present work is devoted to an observational multiwavelength study of the non-thermal emission of O-type stars. The non-thermal radio emission is believed to be synchrotron radiation, therefore requiring the existence of a magnetic field as well as of a population of relativistic electrons. The physical circumstances responsible for the acceleration of electrons up to relativistic velocities are not yet completely elucidated, but such an acceleration most probably occurs through the first order Fermi mechanism in the presence of hydrodynamic shocks, also called the Diffusive Shock Acceleration (DSA) mechanism. In the context of massive stars, the shocks responsible for this acceleration process may be intrinsic to their stellar winds, or arise from the collision between stellar winds in binary systems. In addition, the existence of non-thermal emission processes such as inverse Compton scattering suggests the possibility to detect a high-energy counterpart to the non-thermal emission observed in the radio domain. The objectives of this work are to (1) study the impact of the multiplicity on the non-thermal emission, (2) investigate the issue of the non-thermal emission of massive stars in the high-energy domain, and (3) discuss the possibility to constrain physical quantities such as the magnetic field strength through the study of these non-thermal emission processes. We investigate in detail several non-thermal emitting O-type stars, namely HD168112, HD167971, Cyg OB2 #8A, Cyg OB2 #9, and HD15558. For most of these targets, high quality XMM-Newton data are used in order to study their X-ray properties. In most case, the question of the multiplicity is also addressed through optical studies performed on the basis of data obtained with ground-based telescopes. The most intensive study is carried out on the Cyg OB2 region, for which we also obtained and analysed INTEGRAL data, in order to investigate the possible relation between the massive stars in Cyg OB2 and the unidentified EGRET source 3EG J2033+4118. In addition, high quality XMM-Newton data of the close massive binary HD159176 are also studied. Even though this latter target does not belong to the category of non-thermal radio emitters, its study unexpectedly turns out to be crucial in the context of this campaign as it might be the first O + O system likely to be classified as an n! on-thermal X-ray emitter. Considering our observational results, along with results from radio observations mainly coordinated by colleagues from the Royal Observatory of Belgium, we propose a general qualitative schematic view of the non-thermal emission from massive stars. First, it seems that the multiplicity plays a crucial role in the non-thermal emission processes. Second, we have found that the simultaneous detection of non-thermal radiation in the radio and X-ray (below 10.0 keV) domains is unlikely. Non-thermal radio emitters are indeed most probably binaries with periods longer than a few weeks, whilst only close binaries with periods of at most a few days may be non-thermal emitters in the soft X-ray domain. However, such a simultaneous detection is possible if the very hard X-rays or soft gamma-rays are considered, i.e. in a domain where the thermal emission from the colliding winds does not overwhelm the non-thermal emission. Moreover, it appears that the existence of non-thermal X-ray emitters without a non-thermal radio counterpart should be envisaged. Finally, the simultaneous detection of radio and high-energy non-thermal emissions is likely to lead to an indirect method to estimate the local magnetic field strength in the colliding-wind region of massive binaries. [less ▲]

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See detailVibration Testing and System Identification
Dimitriadis, Grigorios ULg

Scientific conference (2005, December 16)

This presentation is a summary of the recent activity of the Dynamics and Aeroelasticity Research Group of the University of Manchester on the subjects of Vibration Testing and System Identification.

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See detailL’employabilité : un impératif de concurrence
Orianne, Jean-François ULg; Conter, Bernard

Conference (2005, December 16)

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See detailNederlands, de taal van een tweestromenland
Vromans, Joseph ULg

Conference given outside the academic context (2005)

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See detailStability domains, substrate-induced conformational changes, and hinge-bending motions in a psychrophilic phosphoglycerate kinase: A microcalorimetric study
Zecchinon, Laurent ULg; Oriol, A.; Netzel, U. et al

in Journal of Biological Chemistry (2005), 280(50), 41307-41314

The cold-active phosphoglycerate kinase from the Antarctic bacterium Pseudomonas sp. TACII18 exhibits two distinct stability domains in the free, open conformation. It is shown that these stability ... [more ▼]

The cold-active phosphoglycerate kinase from the Antarctic bacterium Pseudomonas sp. TACII18 exhibits two distinct stability domains in the free, open conformation. It is shown that these stability domains do not match the structural N- and C-domains as the heat-stable domain corresponds to about 80 residues of the C-domain, including the nucleotide binding site, whereas the remaining of the protein contributes to the main heat-labile domain. This was demonstrated by spectroscopic and microcalorimetric analyses of the native enzyme, of its mutants, and of the isolated recombinant structural domains. It is proposed that the heat-stable domain provides a compact structure improving the binding affinity of the nucleotide, therefore increasing the catalytic efficiency at low temperatures. Upon substrate binding, the enzyme adopts a uniformly more stable closed conformation. Substrate-induced stability changes suggest that the free energy of ligand binding is converted into an increased conformational stability used to drive the hinge-bending motions and domain closure. [less ▲]

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See detailIn vitro and in vivo analysis of macroporous biodegradable poly(D,L-lactide-co-glycolide) scaffolds containing bioactive glass
Day, Richard M; Maquet, Véronique; Boccaccini, Aldo R. et al

in Journal of Biomedical Materials Research, Part A (2005), 75A(4), 778-787

Recent studies have demonstrated the angiogenic potential of 45S5 Bioglass (R). However, it is not known whether the angiogenic properties of Bioglass (R) remain when the bioactive glass particles are ... [more ▼]

Recent studies have demonstrated the angiogenic potential of 45S5 Bioglass (R). However, it is not known whether the angiogenic properties of Bioglass (R) remain when the bioactive glass particles are incorporated into polymer composites. The objectives of the current study were to investigate the angiogenic properties of 45S5 Bioglass (R) particles incorporated into biodegradable polymer composites. In vitro studies demonstrated that fibroblasts Cultured on discs consisting of specific quantities of Bioglass (R) particles mixed into poly(D,L-lactide-co-glycolide) secreted significantly increased quantities of vascular endothelial growth factor. The optimal quantity of Bioglass (R) particles determined from the in vitro experiments was incorporated into three-dimensional macroporous poly(D,L-lactide-co-glycolide) foam scaffolds. The foam scaffolds were fabricated using either compression molding or thermally induced phase separation processes. The foams were implanted subcutaneously into mice for periods Of Lip to 6 weeks. Histological assessment was used to determine the area of granulation tissue around the foams, and the number of blood vessels within the granulation tissue was counted. The presence of Bioglass (R) particles in the foams produced a sustained increase in the area of granulation tissue surrounding the foams. The number of blood vessels surrounding the neat foams was reduced after 2 weeks of implantation; however, compression-molded foams containing Bioglass (R) after 4 and 6 weeks of implantation had significant]), more blood vessels surrounding the foams compared with foams containing no Bioglass (R) at the same time points. These results indicate that composite polymer foam scaffolds containing Bioglass (R) particles retain granulation tissue and blood vessels surrounding the implanted foams. The use of this polymer composite for tissue engineering scaffolds might provide a novel approach for ensuring adequate vascular Supply to the implanted device. [less ▲]

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See detailExcited [70,l(+)] baryons in large N-c QCD
Matagne, Nicolas; Stancu, Floarea ULg

in Physics Letters B (2005), 631(1-2), 7-15

The masses of the positive parity [70, 0(+)] and [70, 2(+)] non-strange baryons are calculated in large N-c QCD by considering the most dominant operators in an 1/N-c expansion. The approach is based on ... [more ▼]

The masses of the positive parity [70, 0(+)] and [70, 2(+)] non-strange baryons are calculated in large N-c QCD by considering the most dominant operators in an 1/N-c expansion. The approach is based on the introduction of an excited core, obtained after the last particle (an excited quark) has been removed. Configuration mixing is neglected, for simplicity. Although being a sub-leading 1/Nc order, we find that the spin-spin interaction plays a dominant role in describing the data. The role of No operators is also pointed out. We show how the contribution of the linear term in Nc, of the spin-spin and of the spin-orbit terms vary with the excitation energy. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailLe rôle des marchés fonciers dans la production des nouveaux espaces résidentiels en Belgique
Halleux, Jean-Marie ULg

Conference given outside the academic context (2005)

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See detailLes Wallons à Versailles : Henri-Joseph Rutxhiel. Sculpteur du pouvoir entre Empire et Restauration
Etienne, Mary ULg

in Carpeaux, Carole (Ed.) Les Wallons à Versailles (2005)

Édité dans le cadre de la journée d'études "Les Wallons à Versailles" organisée par la Commission royale des Monuments, Sites et Fouilles, le 5 décembre 2007, au château de Versailles, cet ouvrage ... [more ▼]

Édité dans le cadre de la journée d'études "Les Wallons à Versailles" organisée par la Commission royale des Monuments, Sites et Fouilles, le 5 décembre 2007, au château de Versailles, cet ouvrage regroupe les communications scientifiques du colloque ainsi que l’histoire de grands acteurs wallons à travers deux siècles d'Histoire commune entre la France et la Wallonie. [less ▲]

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