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See detailExperimental astrochemistry: from ground-based to space-borne laboratories (Foreword)
De Becker, Michaël ULg; Cottin, Hervé; Fleury-Frenette, Karl ULg et al

in Bulletin de la Société Royale des Sciences de Liège (2015, January), 84(4-6),

The investigation of the origin and evolution of molecules in space environments, either in interstellar or interplanetary conditions, constitutes a topic of high importance in modern space sciences. The ... [more ▼]

The investigation of the origin and evolution of molecules in space environments, either in interstellar or interplanetary conditions, constitutes a topic of high importance in modern space sciences. The presence of diversified and complex molecules motivates astrochemists to explore their formation mechanisms along with the physical conditions ruling these physico-chemical processes. Beside theoretical approaches aiming at simulating these processes, experimental techniques are nowadays frequently applied. Both laboratory and space experiment projects allow to reproduce to some extent the adequate conditions to understand some of these processes. The most recent results based on these techniques, and the prospects for future investigations, including the use of space platforms, were the scientific motivation of this workshop. These proceedings summarize a part of the content of this workshop, including abundant references to the relevant bibliography. [less ▲]

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See detailMassive stars: privileged sources of cosmic-rays for interstellar astrochemistry
De Becker, Michaël ULg

in Bulletin de la Société Royale des Sciences de Liège (2015, January), 84

Massive stars can be considered as crucial engines for interstellar physics. They are indeed the main providers of UV radiation field, and constitute a substantial source of chemical enrichment. On their ... [more ▼]

Massive stars can be considered as crucial engines for interstellar physics. They are indeed the main providers of UV radiation field, and constitute a substantial source of chemical enrichment. On their evolution time-scale (at most about 10 Myr), they typically stay close to their formation site, i.e. close to molecular clouds very rich in interstellar molecules. These stellar objects have also the property to be involved in particle acceleration processes leading to the production of high energy charged particles (cosmic-rays). After rejection in the interstellar medium, these particles will play a substantial role in processes such as those simulated in various facilities dedicated to experimental astrochemistry. This short contribution intends to put these particles, crucial for astrochemistry, in their adequate astrophysical context. [less ▲]

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See detailThe philosophical and political commitments of Eugène Catalan
Vandersmissen, Jan ULg

in Bulletin de la Société Royale des Sciences de Liège (2015), 84

In 1865 the French mathematician Eugène Catalan was appointed professor at the University of Liege. In the nineteenth century the Belgian government developed a policy of attracting famous foreign ... [more ▼]

In 1865 the French mathematician Eugène Catalan was appointed professor at the University of Liege. In the nineteenth century the Belgian government developed a policy of attracting famous foreign scholars, mainly coming from the German principalities and France, in order to bring the education system to a higher level. In this case, however, the appointment had an outspoken political and philosophical dimension. Catalan sought and found refuge in Belgium because his career prospects in France were severely hindered due to his strong republican and anti-Bonapartist viewpoints. In a speech he gave at the University’s Academic Hall on the occasion of his retirement on December 7, 1881, Catalan emphasized he had two passions in life: la Politique militante et les Mathématiques [“Militant Politics and Mathematics”]. In this paper, we investigate the first of these passions against the background of the revolutionary tensions of the time on the basis of a series of primary sources: first, a brochure edited by Catalan himself at the end of his life, entitled Miettes littéraires et politiques, par un vieux mathématicien (Liège, 1889); second, Catalan’s correspondence, covering several decades, and preserved at the Manuscripts Department of the University of Liège; third, a journal kept by Catalan during the years 1858 to 1862, entitled Journal d’un bourgeois de Paris. An in-depth analysis of these sources allows us to discover Catalan’s own perception of his political and philosophical commitments, the reasons behind his involvement in the revolutionary uprisings of 1830, 1848 and 1851, the exact nature of his activism, his interpretation of the republican ideal, his political hopes and deceptions, his view on both French and European social and political realities, his struggle with the Catholic Church, the meaning of his engagement in Freemasonry. [less ▲]

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See detailLa symétrie du vivant : des organismes aux molécules
Thiry, Marc ULg

in Bulletin de la Société Royale des Sciences de Liège (2014, October 28), 83

Les êtres vivants possèdent des caractéristiques communes de symétrie et de dissymétrie. Celles-ci ne concernent pas uniquement l’organisation externe des organismes vivants mais impliquent aussi tous ... [more ▼]

Les êtres vivants possèdent des caractéristiques communes de symétrie et de dissymétrie. Celles-ci ne concernent pas uniquement l’organisation externe des organismes vivants mais impliquent aussi tous leurs niveaux d’organisation jusqu’aux molécules qui les constituent. Le monde vivant se singularise du monde inanimé par l’homochiralité des molécules biologiques. [less ▲]

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See detailL'asymétrie en chimie organique: Des effets non-linéaires jusqu'à l'apparition de la vie
Monbaliu, Jean-Christophe ULg

in Bulletin de la Société Royale des Sciences de Liège (2014)

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See detailLa symétrie des minéraux.
Hatert, Frédéric ULg

in Bulletin de la Société Royale des Sciences de Liège (2014), 83

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See detailAstrochemistry: The issue of molecular complexity in astrophysical environments
De Becker, Michaël ULg

in Bulletin de la Société Royale des Sciences de Liège (2013), 83

Astrochemistry aims at studying chemical processes in astronomical environments. This discipline -- located at the crossroad between astrophysics and chemistry -- is rapidly evolving and explores the ... [more ▼]

Astrochemistry aims at studying chemical processes in astronomical environments. This discipline -- located at the crossroad between astrophysics and chemistry -- is rapidly evolving and explores the issue of the formation of molecules of increasing complexity in particular physical conditions that deviate signi - cantly from those frequently encountered in chemistry laboratories. The main goal of this paper is to provide an overview of this discipline. So far, about 170 molecules have been identi ed in the interstellar medium (ISM). The presence of this molecular diversity constitutes a rm evidence that e cient formation processes are at work in the interstellar medium. This paper aims at summarizing most of present ideas that are explored by astrochemists to investigate the chemistry taking place in various astronomical environments, with emphasis on the particular conditions which are met in space (including radiation elds, cosmic-rays, low densities...). The more ambitious question of the molecular complexity is addressed following two approaches presented to be converging. The rst approach considers the growing complexity starting from the most simple chemical species in interstellar environments, and the second approach envisages successive precursors of the most complex species commonly found on Earth, and in particular in our biochemistry. The issue of molecular complexity constitutes one of the main modern scienti c questions addressed by astrochemistry, and it is used as a guideline across this paper. [less ▲]

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See detailPolymer-​based nanocomposites: toward lightweight ultraperformance materials
Thomassin, Jean-Michel ULg; Jérôme, Christine ULg

in Bulletin de la Société Royale des Sciences de Liège (2013), 82

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See detailUne brève histoire des centres réactionnels de la photosynthèse
Franck, Fabrice ULg

in Bulletin de la Société Royale des Sciences de Liège (2012), 81

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See detailLes énergies marines
Beckers, Jean-Marie ULg

in Bulletin de la Société Royale des Sciences de Liège (2012), 81

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See detailInfluence of the water content in the synthesis of fructose laurate by immobilized lipase B of Candida antarctica (Novozym 435)
Olive, Gilles ULg; Pompeu Torezan, Gabriela A.; Blecker, Christophe ULg

in Bulletin de la Société Royale des Sciences de Liège (2012), 81(2012), 82-89

New synthesis conditions for a direct esterification of fructose by lauric acid with Novozym 435 as a catalyst are reported in this paper. With these new conditions, a conversion rate of 72% was achieved ... [more ▼]

New synthesis conditions for a direct esterification of fructose by lauric acid with Novozym 435 as a catalyst are reported in this paper. With these new conditions, a conversion rate of 72% was achieved, which is almost the same value as in the case of transesterification where no water as by-product is produced (74.6 %). The conversion rate of these reactions can be modeled as a function of the initial water content by a three-parameter power law for the esterification and by an exponential law for the transesterification. The influence of the water content on the mono over di-ester ratio will also be discussed to a lesser extent. [less ▲]

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See detailA first orbital solution for the non-thermal radio emitter Cyg OB2 #9
Nazé, Yaël ULg; Damerdji, Yassine ULg; Rauw, Grégor ULg et al

in Bulletin de la Société Royale des Sciences de Liège (2011), 80

We reported in 2008 the first detection of the binary nature of Cyg OB2 #9. Since then, we have continued our spectroscopic monitoring of this object, doubling the number of available spectra of the star ... [more ▼]

We reported in 2008 the first detection of the binary nature of Cyg OB2 #9. Since then, we have continued our spectroscopic monitoring of this object, doubling the number of available spectra of the star while covering a second periastron passage. Using a variety of techniques, the radial velocities were estimated and a first, preliminary orbital solution was derived (P=2.4 yrs). The mass ratio appears close to unity and the eccentricity is large, 0.7-0.75. [less ▲]

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See detailHerschel-PACS observations of Nebulae Ejected by Massive Stars
Vamvatira-Nakou, Chloi ULg; Royer, Pierre; Hutsemekers, Damien ULg et al

in Bulletin de la Société Royale des Sciences de Liège (2011), 80

The study of the nebulae ejected from Luminous Blue Variables and the circumstellar bubbles around Wolf-Rayet stars, which radiate strongly in the infrared due to the heating of dust, is crucial for the ... [more ▼]

The study of the nebulae ejected from Luminous Blue Variables and the circumstellar bubbles around Wolf-Rayet stars, which radiate strongly in the infrared due to the heating of dust, is crucial for the understanding of the massive stars evolution. With Herschel we are able to observe these objects in the far-infrared region. In the context of the Mass-loss from Evolved StarS guaranteed time key program, we obtained imaging and spectroscopic observations of nebulae associated with Luminous Blue Variable and Wolf-Rayet stars using PACS, one of the three instruments on-board Herschel. A description of these observations, data analysis and preliminary results are presented. [less ▲]

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See detailStudy of a possible X-ray sensor based on the Plasmon Surface Resonance for the next generation of instruments
Hervé, Anthony ULg; Hastanin, Juriy ULg; Habraken, Serge ULg et al

in Bulletin de la Société Royale des Sciences de Liège (2011), 80

With the new generation of X-ray space observatories, such as IXO in preparation, we explore a new technology in order to improve the spectral resolution and the sensitivity of future instruments. We have ... [more ▼]

With the new generation of X-ray space observatories, such as IXO in preparation, we explore a new technology in order to improve the spectral resolution and the sensitivity of future instruments. We have studied the possibility to create a sensor based on the Surface Plasmon Resonance (SPR), already used in chemistry and biomedical applications, and have determined the preliminary constraints on its size, energy resolution and working temperature. [less ▲]

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See detailMixing in magnetic OB stars
Morel, Thierry ULg

in Bulletin de la Société Royale des Sciences de Liège (2011), 80

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See detailThe Mons campaign on OB stars
Morel, Thierry ULg; Rauw, Grégor ULg; Eversberg, T. et al

in Bulletin de la Société Royale des Sciences de Liège (2011), 80

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See detailModélisation intégrée du cycle de l'eau : méthodologie et perspectives
Deliège, Jean-François ULg

in Bulletin de la Société Royale des Sciences de Liège (2010), 79

Au delà du rappel contextuel (cycle de l’Eau, Modélisation et Modélisation Intégrée), l'objectif vise à présenter des Modèles Descriptifs et Physiquement Basés existant et à investiguer la similitude des ... [more ▼]

Au delà du rappel contextuel (cycle de l’Eau, Modélisation et Modélisation Intégrée), l'objectif vise à présenter des Modèles Descriptifs et Physiquement Basés existant et à investiguer la similitude des besoins de connaissance de la qualité de l'eau relativement aux problématiques (i) accident (impact court terme, impact long terme), (ii) changement Climatique (impact long terme). Il est également proposé un modèle conceptuel opérationnel orienté quantité puis qualité de l'eau et capable de simuler par exemple les effets de la gestion anthropique, tant à court qu'à long terme (Changement climatique). [less ▲]

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See detailStudying bright, massive stars in the era of large telescopes I. General context
Rauw, Grégor ULg

in Bulletin de la Société Royale des Sciences de Liège (2010), 79

Stars of spectral type O play a key role in many processes in our Galaxy and beyond. However, there are still a number of open issues about these massive and luminous objects that need to be ad-dressed ... [more ▼]

Stars of spectral type O play a key role in many processes in our Galaxy and beyond. However, there are still a number of open issues about these massive and luminous objects that need to be ad-dressed. Several of these questions require (long-term) spectroscopic monitoring that is difficult to achieve with the highly-demanded equipment on most modern professional instruments. However, these kinds of studies offer an opportunity for collaborations between amateur spectroscopists and professional astrophysicists. [less ▲]

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See detailStudying bright, massive stars in the era of large telescopes II : Wind structures
Morel, Thierry ULg

in Bulletin de la Société Royale des Sciences de Liège (2010), 79

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See detailEvolution de la vie pendant les quatre premiers milliards d’années
Javaux, Emmanuelle ULg

in Bulletin de la Société Royale des Sciences de Liège (2009), 79

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