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 detailExpanding the scope of controlled radical polymerization via cobalt–tellurium radical exchange reaction
Kermagoret, Anthony ULg; Nakamura, Yasuyuki; Bourguignon, Maxime et al

in ACS Macro Letters (2014), 3(1), 114-118

Cobalt-mediated radical polymerization (CMRP) and tellurium-mediated radical polymerization (TERP) were combined for the first time, offering new perspectives in the precision design of macromolecular ... [more ▼]

Cobalt-mediated radical polymerization (CMRP) and tellurium-mediated radical polymerization (TERP) were combined for the first time, offering new perspectives in the precision design of macromolecular structures. In particular, the present work highlights the benefits of this strategy for the synthesis of novel poly(vinyl acetate)-based block copolymers. A range of well-defined poly(vinyl acetate)s (PVAc) were first produced via CMRP using the bis(acetylacetonato)cobalt(II) complex (Co(acac)2) as a regulating agent. Substitution of a methyltellanyl moiety for Co(acac)2 at the ω-chain end of the precursor was then achieved upon treatment with dimethylditelluride. In contrast to the PVAc prepared by TERP, the ones produced by sequential CMRP and Co/Te exchange reaction almost exclusively consist of regular head-to-tail-TeMe chain-end species that can be activated by TERP. Ultimately, a series of monomers problematic in Co(acac)2-mediated radical polymerization including N-isopropylacrylamide (NIPAM), 2-(dimethylamino)ethyl acrylate (ADAME), n-butyl acrylate (BA), isoprene (IP), and vinylimidazole (NVIm) were polymerized by TERP from the PVAc–TeMe macroinitiators leading to novel diblock copolymers that cannot be made by each technique used separately. [less ▲]

Detailed reference viewed: 15 (5 ULg)
Peer Reviewed
See detailExpanding the value of your practice with dental implants.
Van Heusden, Alain ULg

Conference (2006)

Detailed reference viewed: 3 (0 ULg)
Full Text
See detailAn expanding Universe without dark matter and dark energy
Magain, Pierre ULg

E-print/Working paper (2012)

Assuming that observers located inside the Universe measure a time flow which is different from the time appearing in the Friedmann-Lemaıtre equation, and determining this time flow such that the Universe ... [more ▼]

Assuming that observers located inside the Universe measure a time flow which is different from the time appearing in the Friedmann-Lemaıtre equation, and determining this time flow such that the Universe always appears flat to these observers, we derive a simple cosmological model which allows to explain the velocity dispersions of galaxies in galaxy clusters without introducing dark matter. It also solves the horizon problem without recourse to inflation. Moreover, it explains the present acceleration of the expansion without any resort to dark energy and provides a good fit to the observations of distant supernovæ. Depending on the present value of the matter-energy density, we calculate an age of the Universe between 15.4 and 16.5 billion years, ignificantly larger than the 13.7 billion years of the standard CDM model. Our model has a slower expansion rate in the early epochs, thus leaving more time for the formation of structures such as stars and galaxies. [less ▲]

Detailed reference viewed: 33 (2 ULg)
Full Text
See detailExpansion et régression: deux mots clés de la dynamique des populations du martin pêcheur (Alcedo atthis)
Libois, Roland ULg; Hallet, Catherine

in Aves (1989), 26(n° spécial "Actes...."), 93-101

Annual censuses of nest kingfishers are performed since 1973 in the valley of the river Lesse, a tributary of the river Meuse (Belgium). The authors document sharp population fluctuations. It appears that ... [more ▼]

Annual censuses of nest kingfishers are performed since 1973 in the valley of the river Lesse, a tributary of the river Meuse (Belgium). The authors document sharp population fluctuations. It appears that these are mainly due to the weather conditions prevailing at key-periods. Hard winters reduce the numbers, sometimes to a low level, whereas heavy late-spring or early- summer rains involve a bad reproduiction rate (namely through clutch losses following flooding). Hence, the recovery of the nesting population is weakened. In comparison, other factors such as predation, seem to have only a limitid effect. In other respects, the noxious consequences of permanent disturbances are illistrated in the that part of river Lesse where kayak is practised on a large commercial scale. [less ▲]

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailExpansion Machine and fluid selection for the Organic Rankine Cycle
Quoilin, Sylvain ULg; Declaye, Sébastien ULg; Lemort, Vincent ULg

in Proceedings of the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (2010, July)

This paper considers a whole range of ORC applications, in terms of power (from the kW-scale to the multi-MW plants), heat source temperature (from 90°C to more than 300°C) or heat source nature (solar ... [more ▼]

This paper considers a whole range of ORC applications, in terms of power (from the kW-scale to the multi-MW plants), heat source temperature (from 90°C to more than 300°C) or heat source nature (solar, biomass, waste heat recovery, geothermy, etc.). Five typical ORC applications are considered in terms of evaporating and condensing temperature. A screening of the most used ORC working fluids is performed, and their thermodynamics performances are compared with respect to the foreseen application. A detailed analysis of the most common expansion machines is then conducted, by comparing their respective operating maps for each fluid and for each application type. The considered expansion machines are the single-stage radial-inflow turbine, the screw expander, and the scroll expander, which are widely used in commercial applications and/or in scientific literature. The limitations of these machines are listed and considered to define an operating map for each considered fluid. Finally, the allowable power range is described with respect to the application and to the selected expansion device. [less ▲]

Detailed reference viewed: 850 (43 ULg)
Full Text
Peer Reviewed
See detailExpansion of CD16+ CD56+ NK cells in vericyte® NK cell growth medium
Brohée, Laura ULg; Bastin, Renaud ULg; Wingert, S et al

Poster (2013)

Natural Killer (NK) cells play a key role in host resistance to virus and tumour. These cells are potent killers of virus infected and tumour cells via a direct recognition of the target by activation ... [more ▼]

Natural Killer (NK) cells play a key role in host resistance to virus and tumour. These cells are potent killers of virus infected and tumour cells via a direct recognition of the target by activation receptor such as NKG2D or by inducing Fcγ receptor (FcγRIII, CD16) mediated antibody dependent cellular cytotoxicity (ADCC). Current NK cell-based cancer immunotherapy aims to produce large amounts of functional NK cells, unfortunately most culture media used for NK cell expansion induced the downregulation of CD16 on NK cells. Here, we tested the impact of a new NK cell growth medium (Vericyte® from Medicyte) on CD16 expression. Sorted NK cells and peripheral blood mononuclear cells (PBMC) were cultivated in vericyte® NK cell growth medium and cells issued from these cultures were characterized in term of expansion and phenotype at several time points. After 5 days of culture, an expansion of both NK cells and PBMC was observed and maintained at least until day 20 of culture. In PBMC cultures, we observe only a small preferential NK cell growth since NK cells were around 5-10% at beginning of the culture and this percentage increased to 15% at the end of the culture. However, these cells showed a high proliferative potential when we started the culture with sorted NK cells (the proportion of contaminant cells remain low, under 5%). NK cells expressed CD56 and NKp46 and interestingly after a decreased expression of CD16 on the cell surface at day 3, this receptor was up regulated and most of the cells are CD56bright CD16bright from day 7 to day 12. According FACS FCS/SSC dot plot, NK cells acquired morphology of large activated lymphocytes and some of them expressed activation markers such CD25. Finally, these cells were able to kill efficiently tumour cell line K562. Thus our data show that vericyte® NK cell growth medium allows the expansion of functional CD16+CD56+ NK cells. Cytokine production and ADCC function are under investigation. [less ▲]

Detailed reference viewed: 25 (2 ULg)
Full Text
See detailExpansion of the Magdalenian in Northwest Europe
Miller, Rebecca ULg; Noiret, Pierre ULg

Poster (2011)

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailExpansion of the main auroral oval at Jupiter : evidence for Io’s control over the Jovian magnetosphere
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Poster (2012, April)

In spring 2007, New Horizons' Jupiter fly-by provided a unique opportunity for the largest observation campaign dedicated to the Jovian aurora ever carried out by the Hubble Space Telescope. UV images of ... [more ▼]

In spring 2007, New Horizons' Jupiter fly-by provided a unique opportunity for the largest observation campaign dedicated to the Jovian aurora ever carried out by the Hubble Space Telescope. UV images of the aurora have been acquired on a quasi-daily basis from mid-February to mid-June 2007. Polar projection of the auroral emissions clearly show a continuous long-term expansion of main oval additionally to day by day variations. The main oval moved so much that the Ganymede footprint, which is usually located equatorward of the main emissions, has even been observed inside of it. Simultaneously, the occurrence rate of large equatorward isolated auroral features increased over the season. These emission patches are generally attributed to injections of depleted flux tubes. On 6th June, one of these features exceptionally moved down to the Io footpath. The Io footprint seemed to disappear while the footprint moved through this patch of emission. This disappearance is a unique case among all the UV images of the aurora acquired during the last 12 years. We suggest that all these changes seen in the Jovian aurora are evidence for a major reconfiguration of the magnetosphere induced by increased volcanic activity on Io. Indeed, New Horizons observed particularly intense activity from the Tvashtar volcano in late February 2007. Moreover, sodium cloud brightening caused by volcanic outbursts have also been seen in late May 2007. According to our interpretation, repeated volcanic outbursts beefed up the plasma torus density and its mass outflow rate. This caused the corotation breakdown boundary to migrate closer to Jupiter. Consequently, the main auroral oval moved equatorward. As heavy flux tubes move outward, sparsely filled ones should be injected into the inner magnetosphere in order to conserve the magnetic flux in this region. This phenomenon could explain the large number of injection signatures observed in May-June 2007. Such a cloud of depleted flux tubes probably disrupted the Io-magnetosphere interaction, leading to an abnormally faint Io footprint. [less ▲]

Detailed reference viewed: 29 (13 ULg)
Full Text
Peer Reviewed
See detailExpansion urbaine et risques hydrologiques : cas de Butembo (RDC)
Sahani, Muhindo; Moeyersons, Jan; Ozer, Pierre ULg

Poster (2013, December 19)

Butembo constitue un cas typique de zone urbaine en région tropicale humide rencontrant une explosion démographique exceptionnelle. L’exode vers Butembo pour fuir l’insécurité dans la sous-région a ... [more ▼]

Butembo constitue un cas typique de zone urbaine en région tropicale humide rencontrant une explosion démographique exceptionnelle. L’exode vers Butembo pour fuir l’insécurité dans la sous-région a conduit à une rapide concentration spontanée des populations et à une urbanisation sans cesse croissante. L’imperméabilisation des vastes étendues de terres consécutive à cette expansion spatiale rapide de la ville a généré des problèmes environnementaux qui affectent la structure urbaine. A l’instar de nombreuses villes d’Afrique centrale, Butembo est actuellement confrontée à des risques hydrologiques diversifiés : ravinements progressifs et régressifs, inondations, et remobilisation d’anciens glissements de terrain. [less ▲]

Detailed reference viewed: 57 (5 ULg)
Full Text
See detailExpansions of Nanotechnology
van Lente, Harro; Coenen, Christopher; Fleischer, Torsten et al

in van Lente, Harro; Coenen, Christopher; Fleischer, Torsten (Eds.) et al Little by Little: Expansions of Nanoscience and Emerging Technologies (2012)

Little by little, nanotechnology has emerged amid enormous anticipations and fantastic promises of new materials, aspiring to manipulate our world “atom by atom.” While these grand visions continue to ... [more ▼]

Little by little, nanotechnology has emerged amid enormous anticipations and fantastic promises of new materials, aspiring to manipulate our world “atom by atom.” While these grand visions continue to capture the imaginations of various audiences—and continue to be contested, as well—nanotechnology has developed into more than that. During the last two decades, many research programs and industrial R&D expenditures have resulted in actual products and tangible innovations. Nanotechnology, it seems, is expanding. But what does it mean to say that nanotechnology is expanding? [less ▲]

Detailed reference viewed: 65 (2 ULg)
Peer Reviewed
See detailExpansive benign lesions: treatment by laser.
Smets, Mireille; NISOLLE, Michelle ULg; Bassil, Salim et al

in European Journal of Obstetrics and Gynecology (1996), 65(1), 101-5

Submucous fibroids, polyps and dysfunctional bleeding are responsible for meno-metrorrhagia in women over 40 years of age. The authors describe the technique of hysteroscopic myomectomy and endometrial ... [more ▼]

Submucous fibroids, polyps and dysfunctional bleeding are responsible for meno-metrorrhagia in women over 40 years of age. The authors describe the technique of hysteroscopic myomectomy and endometrial ablation using the Nd-YAG laser and the advantages of the preoperative use of GnRH agonist therapy. They report their results in a series of 746 patients treated for meno-metrorrhagia (366 cases of myomectomy and 380 cases of endometrial ablation). [less ▲]

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailL'expatriation: les différentes étapes d'un long parcours
Robert, Jocelyne ULg

Article for general public (2007)

Detailed reference viewed: 150 (19 ULg)
Peer Reviewed
See detailExpectations can influence not only the psychomotor but also the some of the cognitive effects of caffeine
Bernaerts, Pascale; Servais, Christine; Tirelli, Ezio ULg

in International Journal of Neuropsychopharmacology (2000), 3(Supplement), 113

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailThe Expected Design Space for analytical methods: a new perspective based on modeling and prediction
Lebrun, Pierre ULg; Boulanger, Bruno ULg; Debrus, Benjamin ULg et al

Conference (2008, June)

The Design Space (DS) of an analytical method is defined as the set of factor settings that provides satisfactory results, with respect to pre-defined constraints. The proposed methodology aims at ... [more ▼]

The Design Space (DS) of an analytical method is defined as the set of factor settings that provides satisfactory results, with respect to pre-defined constraints. The proposed methodology aims at identifying a region in the space of factors that will likely provide satisfactory results during the future use of the analytical method in routine, through an optimization process of this method. First, the DS is statistically defined as derived from the β-Expectation prediction interval. Second, multi-criteria perspective is added in this definition as it is often required for optimizing analytical method. Finally, a Monte-Carlo simulation is envisaged to numerically predict and identify the DS under uncertainty. Examples based on high-performance liquid chromatography (HPLC) methods will be given, illustrating the applicability of the methodology. [less ▲]

Detailed reference viewed: 62 (7 ULg)
Peer Reviewed
See detailExpected Design Space: a Bayesian perspective based on modelling, prediction and multi-criteria decision method
Lebrun, Pierre ULg; Boulanger, Bruno ULg

Conference (2009, October)

The Design Space (DS) is defined as the set of factors settings (input conditions) that provides results at least better than pre-defined acceptance limits. The proposed methodology aims at identifying a ... [more ▼]

The Design Space (DS) is defined as the set of factors settings (input conditions) that provides results at least better than pre-defined acceptance limits. The proposed methodology aims at identifying a region in the space of factors that will likely provide satisfactory results during the future use of an analytical method or process in routine, through an optimization process. First, in a Bayesian framework, DS is derived from the joint predictive posterior distribution of the responses in a multivariate multiple regression problem using non-informative as well as informative prior distribution of the parameters. The case of DS in presence of highly correlated responses will be covered. Second, a multi-criteria decision is taken with respect to the pre-defined acceptance limits, aiming to identify the DS of any analytical methods or other processes. A strong link is made between acceptance limits and objective functions to optimize, using desirability functions and index. Examples based on high-performance liquid chromatography (HPLC) methods will be given, illustrating the applicability of the methodology with highly correlated and constrained responses. [less ▲]

Detailed reference viewed: 16 (3 ULg)
Full Text
Peer Reviewed
See detailExpected returns and volatility in european stock markets
Corhay, Albert ULg; Tourani-Rad, Alireza

in International Review of Economics and Finance (1994), 3(1), 45-56

The type of return generating process we test here on three European markets are GARCH and AR-GARCH in mean models with innovations that have either normal or student-t densities with time dependant ... [more ▼]

The type of return generating process we test here on three European markets are GARCH and AR-GARCH in mean models with innovations that have either normal or student-t densities with time dependant variances. These models are appealing in that they estimate time varying volatility in disturbances of stock returns series and ex-ante relationship between stock returns and volatility. Our results indicate that there is no statistically significant coefficient estimates for the volatility in the mean equation and that variance might not be appropriate as a measure of risk. Other proxies for risk should then be searched for. [less ▲]

Detailed reference viewed: 25 (3 ULg)
Full Text
See detailUne expérience critique de la pensée. Essai sur les kantismes de Foucault (1961-1969/1978-1984)
Bolmain, Thomas ULg

Doctoral thesis (2011)

Ma thèse se propose de démontrer les points suivants : 1. La pensée de Foucault doit être rapportée comme à sa condition de possibilité philosophique à l’émergence historique de la pensée critique telle ... [more ▼]

Ma thèse se propose de démontrer les points suivants : 1. La pensée de Foucault doit être rapportée comme à sa condition de possibilité philosophique à l’émergence historique de la pensée critique telle qu’elle est associée au nom de Kant : j'ai étudié, dans leurs modalités diverses, « les kantismes de Foucault » ; 2. Pour le comprendre, il est de première importance de se concentrer sur les deux extrêmes de son parcours philosophique (1961-1969 et 1978-1984) ; 3. Ce postulat en implique un autre, de nature méthodologique : le choix de privilégier une reconstruction conceptuelle plutôt que chronologique de l’œuvre de Foucault ; ainsi peut-on mettre en évidence la cohérence très forte qui anime son parcours, sous les discontinuités évidentes qui l’affectent ; 4. La cohérence philosophique de la pensée de Foucault est liée à trois éléments : - l’unité d’une méthode, d’une certaine attitude de la pensée (nominalisme matérialiste réalisé dans la forme d’une archéo-généalogie) ; - l’insistance d’une question toujours posée dans le cadre de l’interrogation critique et d’une reprise partielle des motifs du transcendantal et surtout de la finitude ; cette question se résume du passage de la critique de la question anthropologique classique (Qu’est-ce que l’homme ?) à une enquête portant sur les modes d’être historiques du sujet (Que sommes-nous aujourd’hui ?) ; - la reprise constante de trois concepts qui font le cœur de la conceptualité philosophique moderne et qui forment chez Foucault un réseau à la relative systématicité : ceux d’expérience, de pensée et de critique ; 5. Le concept d’expérience est la pierre de touche de toute l’œuvre de Foucault : seule sa reconstruction patiente permet de saisir, de décrire et d’élaborer de manière satisfaisante la manière de penser qui est la sienne, dans son rapport critique à la pensée de Kant. Une fois rapportée à sa condition historique de possibilité, l'oeuvre de Kant, on comprend à la fois la nécessité conceptuelle de la proposition philosophique de Foucault mais aussi, par suite, les limites de sa proposition éthico-politique. C'est ce que j'ai nommé le nihilisme achevé ou positif de Foucault, la pure exigence d'une transformation micro-politique indéterminée et non-fondée de l'état de choses donné. Aller plus loin que celle-ci supposerait de reprendre la question philosophique directrice de Foucault - comment la transformation du sujet dans l’histoire vers un surcroît d’autonomie s’articule-t-elle à sa finitude radicale ? - aux abords de la dialectique, et en particulier en fonction de concepts critiqués par l'auteur, ceux de négativité et de totalité. [less ▲]

Detailed reference viewed: 97 (24 ULg)
See detailUne expérience d'évaluation dans un système de formation continuée pour les enseignants du fondamental : rôles, méthodologie, effets, problèmes
Giot, Bernadette ULg; Stegen, Pierre

in Bain, D. (Ed.) Fonctionnement de l'évaluation dans la formation : évaluation du fonctionnement de la formation (1996)

Detailed reference viewed: 6 (0 ULg)