Publications ORBi OA
Bookmark and Share    
Full Text
See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2008)

L'énigme magnétique solaire; V1280 Sco : la nova fumante; Spirales barrées; Galaxies en fusion; L'étoile pivoine; Fermi-GLAST; Nuages martiens; Chaînon manquant; 2006 SQ372; Rosetta près de Steins; Nuages ... [more ▼]

L'énigme magnétique solaire; V1280 Sco : la nova fumante; Spirales barrées; Galaxies en fusion; L'étoile pivoine; Fermi-GLAST; Nuages martiens; Chaînon manquant; 2006 SQ372; Rosetta près de Steins; Nuages noctiluques; Une découverte massive de XMM-Newton; [less ▲]

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailPoints de repère pour prévenir la maltraitance
Bullens, Quentin ULg; Debluts, Danielle; Dubois, Françoise

Learning material (2008)

Detailed reference viewed: 95 (13 ULg)
Full Text
Peer Reviewed
See detailA structural, magnetic and Mössbauer spectral study of the magnetocaloric Mn1.1Fe0.9P1-xGex compounds
Sougrati, Moulay Tahar ULg; Hermann, Raphaël ULg; Grandjean, Fernande ULg et al

in Journal of Physics : Condensed Matter (2008), 20

The structural, magnetic and Mössbauer spectral properties of the magnetocaloric Mn1.1Fe0.9P1−xGex compounds, with 0.19 < x < 0.26, have been measured between 4.2 and 295 K. The 295 K unit-cell volume ... [more ▼]

The structural, magnetic and Mössbauer spectral properties of the magnetocaloric Mn1.1Fe0.9P1−xGex compounds, with 0.19 < x < 0.26, have been measured between 4.2 and 295 K. The 295 K unit-cell volume increases from x = 0.19 to 0.22 and is substantially smaller in the ferromagnetic Mn1.1Fe0.9P0.74Ge0.26. The temperature dependence of the magnetization reveals a ferromagnetic to paramagnetic transition with a Curie temperature between approximately 250 and 330 K and hysteresis width of 10 to 4 K, for 0.19 < x < 0.25. The composition Mn1.1Fe0.9P0.78Ge0.22 shows the largest isothermal entropy change of approximately 10 J/(kgKT) at 290 K. The M¨ossbauer spectra have been analysed with a binomial distribution of hyperfine fields correlated with a change in isomer shift and quadrupole shift, a distribution that results from the distribution of phosphorus and germanium among the near neighbours of the iron. The coexistence of paramagnetic and magnetically ordered phases in ranges of temperature of up to 50 K around the Curie temperature is observed in the Mössbauer spectra and is associated with the first-order character of the ferromagnetic to paramagnetic transition. The temperature dependence of the weighted average hyperfine field is well fitted within the magnetostrictive model of Bean and Rodbell. Good fits of the Mössbauer spectra could only be achieved by introducing a difference between the isomer shifts in the paramagnetic and ferromagnetic phases, a difference that is related to the magnetostriction and electronic structure change. [less ▲]

Detailed reference viewed: 63 (15 ULg)
Full Text
Peer Reviewed
See detailPhilosophie politique et approche pragmatique du politique en contexte islamique. Lecture d’al-Mâwardi
Nachi, Mohamed ULg

in Gandolfi et Levi, Paola et Giovani (Ed.) Entre théologie et Politique: Les origines théologiques cachées de la pensée politique contemporaine dans les pays de la Méditerranée (2008, October)

Montrer l'apport d'al-Mâwardi pour le développement d'une approche pragmatique du politique en contexte islamique

Detailed reference viewed: 48 (2 ULg)
Full Text
Peer Reviewed
See detailFire Performance of undamaged and pre-damaged welded steel-concrete composite beam-to-column joints with concrete filled tubes
Alderighi, Elisabetta; Bursi, Oreste; Franssen, Jean-Marc ULg et al

Conference (2008, October)

Major earthquakes in urban areas have often been followed by significant conflagrations that have been difficult to control and have resulted in extensive damage to property. Earthquakes, then, increase ... [more ▼]

Major earthquakes in urban areas have often been followed by significant conflagrations that have been difficult to control and have resulted in extensive damage to property. Earthquakes, then, increase the risk of loss of life if a fire occurs within a building. It is obvious therefore that a fire after an earthquake is a design scenario that should be properly addressed in any performance-based design, in locations where significant earthquakes can occur. In this paper both experimental and numerical results of undamaged and pre-damaged welded steel-concrete composite beam-to-column joints with concrete filled tubes are described as part of a European project aimed at developing fundamental data, design guidelines and prequalification of ductile and fire resistant composite beam-to-column joints. In detail, both the experimental program and the fire experimental results are presented and discussed in this paper together with thermal numerical simulations on frames and joints. Both the experimental activity and the numerical work demonstrated the adequacy of the seismic and joint fire design. [less ▲]

Detailed reference viewed: 68 (2 ULg)
Full Text
See detailFractionation process to produce a new milk ingredient enriched in phospholipids and sphingolipids
Bodson, P.; Dalemans, D.; Danthine, Sabine ULg et al

Poster (2008, October)

Detailed reference viewed: 17 (2 ULg)
Full Text
See detailULG FACULTE D'ARCHITECTURE (ex LAMBERT LOMBARD ).SITE BOTANIQUEISA
Frisenna, Marina ULg

in PROVINCE DE LIEGE-CULTURE (Ed.) BIENNALE INTERNATIONALE -DESIGN LIEGE 2008 (2008)

Detailed reference viewed: 17 (4 ULg)
Full Text
See detailDes chiffres et des Lettres
Habrand, Tanguy ULg

Article for general public (2008)

Detailed reference viewed: 35 (2 ULg)
Full Text
See detailUnderwater Imagery, a Measuring Tool to Extend the Spatio-Temporal Understanding of Benthic Organisms Dynamics: Case Study of Codium elisabethae in the Azores.
Sirjacobs, Damien ULg; Tempera, Fernando; Cardigos, Frederico et al

Poster (2008, October)

Benthic habitat mapping studies have been increasingly exploiting the use of underwater images to collect information on substrate nature and biological coverage. Concurrently, research has been ongoing ... [more ▼]

Benthic habitat mapping studies have been increasingly exploiting the use of underwater images to collect information on substrate nature and biological coverage. Concurrently, research has been ongoing to develop methods that use the imagery collected to conduct regular quantitative monitoring studies of biological resources distributed over large areas. This study provides the first multi-annual monitoring information on the dynamics of a benthic macroalgae population derived from underwater imagery collected by scuba divers in the Monte da Guia Site of Community Importance /Natura 2000 network (Faial isl. Azores, NE Atlantic). The green alga Codium elisabethae - a long-living green alga that represents a potential good indicator of coastal environmental change - was chosen for the study. The analyses focus on using the underwater imagery to quantify seasonal fluctuations of density, percentage cover, biomass, growth rate and primary production of the species. Two study sites were investigated: one was located in a sheltered no-go reserve exhibiting a dense C. elisabethae population, and the other in a location experiencing more exposed conditions and holding a sparser population. Between August 2003 and November 2005, fifteen (15) photo coverages were collected by scuba-divers. Subsequent processing consisted of producing image mosaics and using automated and interactive change detection methods that recognized, measured and counted individuals present in photos of fixed quadrats and yielded dynamical parameters such as population structures, growth, recruitment, and mortality. Chi-square tests of image-derived estimates and in situ measurements confirmed the validity of a centimeter precision estimation of population structure for individuals above 4 cm diameter. Important variability of population structure and density were observed at small spatial scales. Population density showed a sharp reduction in autumn 2003 and did not show a full recovery in spring and summer 2004. During the following year, population of the protected site maintained density and biomass, while at the exposed site population density dropped. The production of information based on observations of thousands of individuals is mandatory in biological population statistics. The presented imagery approach made it possible, avoiding the need to collect all the measurements and quantitative information during time-constrained SCUBA diving operations. [less ▲]

Detailed reference viewed: 68 (15 ULg)
Full Text
See detailHolographic techniques at long wave infrared wavelengths
Vandenrijt, Jean-François ULg; Georges, Marc ULg

in Proceedings of the International Symposium to Commemorate the 60th Anniversary of the Invention of Holography (2008, October)

For industrial applications, holographic interferometry and electronic speckle pattern interferometry techniques using visible laser light are often too sensitive to external perturbations. Consequently ... [more ▼]

For industrial applications, holographic interferometry and electronic speckle pattern interferometry techniques using visible laser light are often too sensitive to external perturbations. Consequently they require too much stability, preventing their widespread use in field applications. One simple idea to overcome this problem is to increase the wavelength of the laser light. We considered the 10 µm wavelength range corresponding to well known CO2 laser and because imagers exist in this spectral range. One other important advantage is that the strain/displacement measurement range is larger than the equivalent techniques in visible light. We will present the preliminary experiences performed so far with components available in our lab. Mainly, we show in-plane electronic speckle pattern interferometry and for the first time digital holographic interferometry. We also discuss specific problems related to the wavelength increase. [less ▲]

Detailed reference viewed: 44 (7 ULg)
Full Text
See detailHolographic interferometry with photorefractive crystals : recent industrial applications
Thizy, Cédric ULg; Georges, Marc ULg; Hustinx, Guy-Michel et al

in Proceedings of the International Symposium to Commemorate the 60th Anniversary of the Invention of Holography (2008, October)

Photorefractive crystals allow in-situ dynamic holographic recording and indefinite reusability. Also they exhibit specific properties that other recording materials do not and which can be advantageously ... [more ▼]

Photorefractive crystals allow in-situ dynamic holographic recording and indefinite reusability. Also they exhibit specific properties that other recording materials do not and which can be advantageously used in holographic interferometry. For 15 years we have been developing holographic interferometry techniques and devices with Bi12SiO20 (BSO) crystals. The dynamic behaviour of the latter allows a high degree of userfriendliness of holographic interferometry (like techniques based on electronic recording), together with higher resolution interferograms (no speckle noise - no need of filtering). In the past we already have presented a wide range of applications in metrology, NDT and vibrations measurement. Here we present recent industrial applications obtained with a device which is now commercially available. It has proven successful applications in highly demanding applications where high resolution was required [less ▲]

Detailed reference viewed: 70 (1 ULg)
Full Text
See detailRole of photorefractive holographic interferometry in Impact Assessment Procedure applied to movable cultural heritage
Thizy, Cédric ULg; De Rauw, Dominique ULg; Georges, Marc ULg et al

in Proceedings of the International Symposium to Commemorate the 60th Anniversary of the Invention of Holography (2008, October)

Detailed reference viewed: 23 (4 ULg)
Full Text
See detailPerspectives politiques et stratégiques autour de la ligne Bruxelles – Luxembourg avant la guerre franco-allemande de 1870
Bechet, Christophe ULg

in Bulletin Trimestriel de l'Institut Archéologique du Luxembourg Arlon (2008), (3/4),

Les tractations dont le réseau ferroviaire luxembourgeois a fait l’objet depuis la construction de ses premières lignes dans les années 1850 jusqu’à la veille de la Première Guerre mondiale constituent un ... [more ▼]

Les tractations dont le réseau ferroviaire luxembourgeois a fait l’objet depuis la construction de ses premières lignes dans les années 1850 jusqu’à la veille de la Première Guerre mondiale constituent un sac de noeuds diplomatiques et financiers particulièrement complexe, eu égard à l’importance géopolitique de cette région coincée entre la France et la Prusse, région autour de laquelle s’exprimeront à plusieurs reprises au cours du XIXe siècle les rivalités politiques, économiques et militaires de ces deux grandes puissances. L’objectif de cet article n’est pas tant de démêler en détail ces « noeuds », qui ont présidé à l’histoire du réseau luxembourgeois, car même synthétisés à l’extrême, un article n’y suffirait pas. Nous nous proposons plutôt, à la manière d’un homme d’Etat ou d’un officier penché sur sa carte d’Etat-major, d’analyser les conséquences politiques, économiques et militaires directes ayant accompagné, dans les années 1850 et 1860, le projet puis l’achèvement en 1858/1859 de la ligne Bruxelles – Arlon – Luxembourg. Cette analyse s’inscrit dans le cadre d’une thèse de doctorat que nous menons à l’Université de Liège sur la géographie militaire de la Belgique (1839-1914) consistant à recueillir un maximum de témoignages de militaires, de diplomates et de publicistes belges et étrangers sur l’importance stratégique de notre territoire. [less ▲]

Detailed reference viewed: 71 (6 ULg)
Full Text
See detailLa répression du négationnisme en Belgique : de la réussite législative au blocage politique
Grandjean, Geoffrey ULg

Conference (2008, October)

This study focuses on the prosecution of genocide-denial in Belgium and on the current deadlock of this political question. A political science approach is used to shed light on this issue which makes ... [more ▼]

This study focuses on the prosecution of genocide-denial in Belgium and on the current deadlock of this political question. A political science approach is used to shed light on this issue which makes often the headlines. The study is based on the analysis of parliamentary documents and on several interviews with the key actors of this issue. This approach enables an analytic understanding of this question. The research topic is all the more meaningful because it concerns dialectics between the present and the past and it puts into questions the place of history in politics. [less ▲]

Detailed reference viewed: 71 (8 ULg)
Full Text
Peer Reviewed
See detailPotential use of Paracentrotus lividus as bioindicator for recent trace element pollution monitoring
Richir, Jonathan ULg; Gobert, Sylvie ULg; Bouquegneau, Jean-Marie ULg

Poster (2008, October)

The Mediterranean Sea is an enclosed basin, highly submitted to anthropogenic pressures. Chemical pollution originating from coastal urban centres and industries, or carried by air and rivers, will ... [more ▼]

The Mediterranean Sea is an enclosed basin, highly submitted to anthropogenic pressures. Chemical pollution originating from coastal urban centres and industries, or carried by air and rivers, will primarily affect its coastal ecosystems. The pollution by trace elements into the marine environment is rapidly evolving further to the recent modifications of their production and industrial uses by men. As a result, some trace elements that were previously poorly studied can be considered now as environmental pollutants, whose concentrations can sometimes be way above their natural baseline levels. The purple sea urchin Paracentrotus lividus is a well know bioindicator used for metal pollution monitoring (Fe, Cd, Cr, Pb, Zn and Cu) along the Mediterranean and Atlantic coasts. This sedentary organism successfully concentrates the pollutants diluted in its environment, and the measured concentrations reflect properly the health status of the ecosystem. This study is a first approach on the use of P. lividus as bioindicator for some less investigated trace elements (Al, V, Mn, Co, Ni, Se, Mo and Ag), chosen for their potential toxic effects. We have compared the element concentrations of the digestive tract tissues and gonads of female and male sea urchins. The organisms were frozen prior to dissection, or they were dissected alive, the two experimental procedures being compared afterwards. The existence of an eventual relationship between their gonadic index or their test diameter and the measured pollutant concentrations was also investigated. [less ▲]

Detailed reference viewed: 205 (25 ULg)
Full Text
See detailNote sur l’expertise en sémiotique
Badir, Sémir ULg

E-print/Working paper (2008)

Detailed reference viewed: 21 (0 ULg)
Full Text
See detailRunning an Interdisciplinary Competency Group
Stassart, Pierre M ULg

Report (2008)

This paper presents a translation of part of a report written by a CRE colleague in Belgium. It concerns the development of a distinctive method of conducting interdisciplinary research, known as a ... [more ▼]

This paper presents a translation of part of a report written by a CRE colleague in Belgium. It concerns the development of a distinctive method of conducting interdisciplinary research, known as a Competency Group. A Competency Group brings together a range of individuals with differing experiences and knowledge of a particular problem. The Competency Group aims to move thinking about the problem forward through group interaction. This translation outlines four key principles for working in this way: the narrative form; intersections between systems of reference; putting knowledge to the test and mutual learning; and the suspension of strategic interests. [less ▲]

Detailed reference viewed: 76 (24 ULg)
Full Text
Peer Reviewed
See detailInterdomain Traffic Engineering in a Locator/Identifier Separation Context
Saucez, Damien; Donnet, Benoît ULg; Iannone, Luigi et al

in IEEE Internet Network Management Workshop (2008, October)

The Routing Research Group (RRG) of the Internet Research Task Force (IRTF) is currently discussing several architectural solutions to build an interdomain routing architecture that scales better than the ... [more ▼]

The Routing Research Group (RRG) of the Internet Research Task Force (IRTF) is currently discussing several architectural solutions to build an interdomain routing architecture that scales better than the existing one. The solutions family currently being discussed concerns the addresses separation into locators and identifiers, LISP being one of them. Such a separation provides opportunities in terms of traffic engineering. In this paper, we propose an open and flexible solution that allows an ISP using identifier/locator separation to engineer its interdomain traffic. Our solution relies on the utilization of a service that transparently ranks paths using cost functions. We implement a prototype server and demonstrate its benefits in a LISP testbed. [less ▲]

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detail. Do innervation of germinal centre and contacts between FDC and nerve fibers be keys to understand the susceptibility difference between bovines and humans to the BSE agent?
Defaweux, Valérie ULg; Dorban, G.; Antoine, Nadine ULg et al

Poster (2008, October)

Background: In regard to BSE and vCJD, the agent tropism for lymphoid tissues is completely different even if the infectious strain responsible and the way of inoculation are identical. During vCJD, the ... [more ▼]

Background: In regard to BSE and vCJD, the agent tropism for lymphoid tissues is completely different even if the infectious strain responsible and the way of inoculation are identical. During vCJD, the infectious agent crosses the digestive barrier and multiplies in lymphoid organs, before progressively reaching the brain. Indeed, in vCJD, it accumulates in the ileum, tonsils, spleen and appendix of infected individuals. In contrast, in cattle, the BSE agent has a low affinity for lymphoid tissues and mainly accumulates in the nervous system. During preclinical stages, infectivity, other than that in the peripheral nervous system or central nervous system, is confined in the distal ileum of orally infected cattle. So, it appears that, at least in the case of BSE and vCJD, host properties can influence the accumulation of the infectious agent in lymphoid organs. Objectives and methods: In this study, we analysed by confocale microscopy the mucosal innervation and the interface between nerve fibres and FDC in bovine and human tonsils using a panel of antibodies. Since differences in the innervation of lymphoid organs depending on species and on age have been reported, we analysed two categories of bovines (calves less than 12 months old and bovines older than 24 months) and two categories of humans (patients less than 5 years old and patients older than 25 years). Results: In both species, ways of innervation by-passing germinal centres could be postulated: nerve fibres are widely distributed in antigen/cell traffic area: the lamina propria, the interfollicular zone and the lymphoepithelial area. We pointed out that, only in tonsils of bovines older than 24 months, nerve fibres are observed to be in contact with FDC. In contrast, in human tonsils, no nerve fibres established contacts with FDC, whatever the age. Discussion: Innervation of germinal centres can be said to be an age-dependent dynamic process in bovines. The weak innervation of the secondary lymphoid organs could thus be a rate-limiting step to neuroinvasion in humans. This species difference could influence the way of neuroinvasion and thus, the susceptibility of bovines and humans to the BSE agent. [less ▲]

Detailed reference viewed: 20 (0 ULg)