Last 7 days
Bookmark and Share    
Peer Reviewed
See detailAbelian bordered factors and periodicity
Charlier, Emilie ULg; Harju, Tero; Puzynina, Svetlana et al

in European Journal of Combinatorics (2016), 51

A finite word u is said to be bordered if u has a proper prefix which is also a suffix of u, and unbordered otherwise. Ehrenfeucht and Silberger proved that an infinite word is purely periodic if and only ... [more ▼]

A finite word u is said to be bordered if u has a proper prefix which is also a suffix of u, and unbordered otherwise. Ehrenfeucht and Silberger proved that an infinite word is purely periodic if and only if it contains only finitely many unbordered factors. We are interested in abelian and weak abelian analogues of this result; namely, we investigate the following question(s): Let w be an infinite word such that all sufficiently long factors are (weakly) abelian bordered; is w (weakly) abelian periodic? In the process we answer a question of Avgustinovich et al. concerning the abelian critical factorization theorem. [less ▲]

Detailed reference viewed: 35 (8 ULg)
Full Text
Peer Reviewed
See detailSaturn’s auroral morphology and field-aligned currents during a solar wind compression
Badman, S.V.; Provan, G.; Bunce, E.J. et al

in Icarus (2016)

Detailed reference viewed: 25 (6 ULg)
Full Text
Peer Reviewed
See detailLes conséquences de la philosophie
Longo, Giuseppe; Cavazzini, Andrea ULg

in Glass Bead (2016)

Detailed reference viewed: 19 (1 ULg)
Peer Reviewed
See detailLa valorisation du patrimoine scientifique, technique et industriel en Belgique francophone : un état des lieux et des enjeux
Peters, Arnaud ULg; Halleux, Robert ULg

in Ballé, Catherine; Cuenca, Catherine (Eds.) Le patrimoine scientifique et technique contemporain (2016)

Detailed reference viewed: 12 (5 ULg)
Full Text
Peer Reviewed
See detailFlexible estimation in cure survival models using Bayesian P-splines
Bremhorst, Vincent; Lambert, Philippe ULg

in Computational Statistics & Data Analysis (2016), 93

In the analysis of survival data, it is usually assumed that any unit will experience the event of interest if it is observed for a sufficiently long time. However, it can be explicitly assumed that an ... [more ▼]

In the analysis of survival data, it is usually assumed that any unit will experience the event of interest if it is observed for a sufficiently long time. However, it can be explicitly assumed that an unknown proportion of the population under study will never experience the monitored event. The promotion time model, which has a biological motivation, is one of the survival models taking this feature into account. The promotion time model assumes that the failure time of each subject is generated by the minimum of N independent latent event times with a common distribution independent of N. An extension which allows the covariates to influence simultane- ously the probability of being cured and the latent distribution is presented. The latent distribution is estimated using a flexible Cox proportional hazard model where the logarithm of the baseline hazard function is specified using Bayesian P-splines. Introducing covariates in the latent distribution implies that the population hazard function might not have a proportional hazard structure. However, the use of P- splines provides a smooth estimation of the population hazard ratio over time. The identification issues of the model are discussed and a restricted use of the model when the follow up of the study is not sufficiently long is proposed. The accuracy of our methodology is evaluated through a simulation study and the model is illustrated on data from a Melanoma clinical trial. [less ▲]

Detailed reference viewed: 26 (4 ULg)
Full Text
See detailThe Magnetodiscs and Aurorae of Giant Planets
Szego, Karoly; Achilleos, Nicholas; Arridge, Chris et al

Book published by Springer Science & Business Media B.V. - Previously published in Space Science Reviews, Volume 187, Issues 1-4, 2015 (2016)

This volume contains the reports discussed during the Workshop “Giant Planet Magne- todiscs and Aurorae” held 26–30 November 2012, at the International Space Science Insti- tute, organised together with ... [more ▼]

This volume contains the reports discussed during the Workshop “Giant Planet Magne- todiscs and Aurorae” held 26–30 November 2012, at the International Space Science Insti- tute, organised together with the Europlanet project, supported by FP7 (Grant No. 228319). Magnetodiscs are large current sheets surrounding Jupiter and Saturn (also Uranus and Neptune) that are filled with plasma principally originating in the natural satellites of these worlds. They are also solar system analogues for astrophysical discs. Magnetodiscs are spe- cial features of the fast rotating giant planets, a special feature of rotationally driven magne- tospheres. Their structure is modified by variability in their plasma sources and by the solar wind. Auroral signatures in the optical and radio wavebands allow a diagnostic of these dynamical processes and enable the visualisation of these large plasma and field structures.The objective of this workshop was to address outstanding issues in the structure and dynamics of magnetodiscs using a comparative approach (see details under topics). More specifically, we aimed to review current understanding of magnetodiscs and auroral re- sponses to magnetodisc dynamics; characterise and understand radial plasma transport in magnetodiscs; determine how magnetic reconnection works in magnetodiscs, and describe the effects on plasma transport; describe the associated auroral responses to internal and ex- ternal magnetospheric processes; characterise how the solar wind influences magnetodiscs and the auroral responses to solar wind-driven dynamics; characterise the spectral and spa- tial properties of auroral emissions produced by magnetodisc dynamics; answer the ques- tion of whether there are significant differences between solar wind- and internally-driven dynamics; and determine the sources of local-time asymmetries in magnetodiscs. This volume is a unique synthesis of all aspects of the giant magnetospheres and their aurorae; it provides an interdisciplinary approach to understanding the coupled system from the solar wind to the atmosphere; it combines the latest observations with current theory and models; and it also contains sufficient breadth for students of magnetospheric and space physics to use as a reference for future research. [less ▲]

Detailed reference viewed: 15 (1 ULg)
Full Text
Peer Reviewed
See detailPhotocatalytic decomposition of hydrogen peroxide over nanoparticles of TiO2 and Ni(II)-porphyrin doped TiO2: a relationship between activity and porphyrin anchoring mode
Tasseroul, Ludivine ULg; Pàez Martinez, Carlos ULg; Lambert, Stéphanie ULg et al

in Applied Catalysis B : Environmental (2016), 182

The nickel tetra(4-carboxyphenyl)porphyrin (TCPPNi) was chimisorbed on Degussa P25 TiO2 at different concentrations. Diffuse reflectance spectroscopy in the UV/vis region, Fourier transform infrared ... [more ▼]

The nickel tetra(4-carboxyphenyl)porphyrin (TCPPNi) was chimisorbed on Degussa P25 TiO2 at different concentrations. Diffuse reflectance spectroscopy in the UV/vis region, Fourier transform infrared spectroscopy and thermal gravimetry combined with differential scanning calorimetry measurements allowed the determination of the TCPPNi anchoring mode. At low TCPPNi concentrations, this anchoring on Degussa P25 TiO2 took place through all four carboxylic groups, while at higher concentrations the anchoring occurred through one or two carboxylic groups. For the firsttime,the effect of UV/vis light irradiation on the H2O2-degradation activity of TiO2 and TCPPNi-doped TiO2 was studied using the method of following the production of O2 by gas pressure monitoring. The activity of seven different catalysts was related to the TCPPNi anchoring mode and the percentage of TiO2 Degussa P25 coverage. An optimum degradation of H2O2 was observed for 0.0115 mol TCPPNi × g−1 P25. In that case, the TCPPNi was anchored through the four carboxylic groups, corresponding to a strong interaction with Degussa P25 TiO2. Moreover, the TCPPNi did not cover the surface completely, therefore allowing the light to reach and activate the TiO2. [less ▲]

Detailed reference viewed: 30 (5 ULg)
Full Text
Peer Reviewed
See detailConclusion
Marganne, Marie-Hélène ULg

in Marganne, Marie-Hélène; Ricciardetto, Antonio (Eds.) En marge du Serment hippocratique : contrats et serments dans le monde gréco-romain. Actes de la Journée d’étude internationale (Liège, 29 octobre 2014) (2016)

Detailed reference viewed: 7 (1 ULg)
Full Text
Peer Reviewed
See detailThe internal consistency of the North Sea carbonate system
Salt, Lesley A.; Thomas, Helmuth; Bozec, Yann et al

in Journal of Marine Systems (2016), 157

Abstract In 2002 (February) and 2005 (August), the full suite of carbonate system parameters (total alkalinity (AT), dissolved inorganic carbon (DIC), pH, and partial pressure of \{CO2\} (pCO2) were ... [more ▼]

Abstract In 2002 (February) and 2005 (August), the full suite of carbonate system parameters (total alkalinity (AT), dissolved inorganic carbon (DIC), pH, and partial pressure of \{CO2\} (pCO2) were measured on two re-occupations of the entire North Sea basin, with three parameters (AT, DIC, pCO2) measured on four additional re-occupations, covering all four seasons, allowing an assessment of the internal consistency of the carbonate system. For most of the year, there is a similar level of internal consistency, with \{AT\} being calculated to within ± 6 μmol kg− 1 using \{DIC\} and pH, \{DIC\} to ± 6 μmol kg− 1 using \{AT\} and pH, pH to ± 0.008 using \{AT\} and pCO2, and pCO2 to ± 8 μatm using \{DIC\} and pH, with the dissociation constants of Millero et al. (2006). In spring, however, we observe a significant decline in the ability to accurately calculate the carbonate system. Lower consistency is observed with an increasing fraction of Baltic Sea water, caused by the high contribution of organic alkalinity in this water mass, not accounted for in the carbonate system calculations. Attempts to improve the internal consistency by accounting for the unconventional salinity–borate relationships in freshwater and the Baltic Sea, and through application of the new North Atlantic salinity–boron relationship (Lee et al., 2010), resulted in no significant difference in the internal consistency. [less ▲]

Detailed reference viewed: 8 (0 ULg)
See detailMigration in the Western Mediterranean: Space, Mobility and Borders
Bernes, Laure-Anne; Bousetta, Hassan ULg; Zickgraf, Caroline ULg

Book published by Routledge (2016)

Detailed reference viewed: 17 (2 ULg)
Full Text
See detailMon enfant bégaie : Que faire ?
Leclercq, Anne-Lise ULg

Conference given outside the academic context (2016)

Detailed reference viewed: 20 (4 ULg)
Full Text
Peer Reviewed
See detailBode, Nicolai und Elisa von der Recke: Korrespondenzen und Netzwerke
Leyh, Valérie ULg

in Kinzel, Till; Berghahn, Cord-Friedrich (Eds.) Johann Joachim Christoph Bode (1731-1793) - ein Aufklärer aus Braunschweig in den kulturellen Netzwerken seiner Zeit (2016)

Detailed reference viewed: 12 (1 ULg)
Full Text
Peer Reviewed
See detailLes frontières du droit à l'épreuve des films de mafias
Thirion, Nicolas ULg; Pasteger, David ULg

in Flores-Lonjou, Magalie (Ed.) Frontière(s) au cinéma - Actes des septièmes rencontres "Droit et cinéma" (2016)

demander dans quelle mesure l’injonction du brigand qui exige « la bourse ou la vie ! » peut être comparée à la norme de comportement édictée par un Etat sous la forme d’une loi, c’est poser la ... [more ▼]

demander dans quelle mesure l’injonction du brigand qui exige « la bourse ou la vie ! » peut être comparée à la norme de comportement édictée par un Etat sous la forme d’une loi, c’est poser la sempiternelle question de la frontière qui sépare le droit du non-droit, tout au moins dans une perspective juspositiviste, en tant que cette école de théorie du droit refuse de définir le phénomène juridique en se référant à une valeur ou un ensemble de valeurs. La frontière du droit et du non-droit est en effet particulièrement difficile à tracer, nonobstant plusieurs siècles de discussions philosophiques à ce sujet. Lorsque, fatigué de parcourir les chemins, le brigand décide de s’installer en ville pour s’y adonner au racket des commerçants du quartier et qu’il s’adjoint ensuite le concours d’autres bandits, c’est un gang de malfaiteurs qui voit le jour. Si, ultérieurement, ce gang se concerte avec d’autres bandes de truands pour s’épauler mutuellement dans les exactions auxquelles ils se livrent sur leurs territoires respectifs, il prend alors la forme d’une organisation criminelle ou, au sens large du terme, d’une « mafia ». Le cinéma de Francis Ford Coppola, Martin Scorsese, Brian De Palma, Sergio Leone ou bien encore Matteo Garrone, entre autres, dépeint, souvent avec réalisme, la genèse et le fonctionnement de telles organisations criminelles. La communication a proposé, au moyen d’illustrations tirées des films de ces grands cinéastes, une analyse de microscopie juridique du crime organisé. Une description serrée de la particule élémentaire du phénomène juridique, identifiée par Lucien François dans son ouvrage de théorie du droit Le cap des Tempêtes sous l’appellation de « jurème », met en lumière une indéniable proximité entre les techniques de pouvoir utilisées respectivement par le brigand isolé, la bande organisée et l’Etat souverain. En remontant ensuite vers la structure plus complexe d’un système étatique, on se demandera si, en fin de compte, dans la vision juspositiviste poussée au bout de sa logique par Lucien François, l’Etat ne pourrait être réduit, d’un point de vue ontologique, à un pouvoir de fait comparable, par les techniques de contrainte qu’il exerce sur ses sujets, à une organisation criminelle – abstraction faite des valeurs promues ou poursuivies par tel ou tel appareil étatique. [less ▲]

Detailed reference viewed: 91 (23 ULg)
Peer Reviewed
See detailLéon d’Oultres
Marchandisse, Alain ULg

in Lecocq, Isabelle (Ed.) Les vitraux de la cathédrale Saint-Paul à Liège (2016)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailArt. Liège et la Guerre de Cent Ans
Marchandisse, Alain ULg

in Moeglin, Jean-Marie (Ed.) Dictionnaire Guerre de Cent Ans (2016)

Detailed reference viewed: 25 (1 ULg)
Full Text
Peer Reviewed
See detailSPICAM observations and modeling of Mars aurorae
Soret, Lauriane ULg; Gérard, Jean-Claude ULg; Libert, Ludivine ULg et al

in Icarus (2016), 264

Martian aurorae have been detected with the SPICAM instrument on board Mars Express both in the nadir and the limb viewing modes. In this study, we focus on three limb observations to determine both the ... [more ▼]

Martian aurorae have been detected with the SPICAM instrument on board Mars Express both in the nadir and the limb viewing modes. In this study, we focus on three limb observations to determine both the altitudes and the intensities of the auroral emissions. The CO (a3P–X1R) Cameron bands between 190 and 270 nm, the CO Fourth Positive system (CO 4P) between 135 and 170 nm, the CO2+ doublet at 289 nm, the OI at 297.2 nm and the 130.4 nm OI triplet emissions have been identified in the spectra and in the time variations of the signals. The intensities of these auroral emissions have been quantified and the altitude of the strongest emission of the CO Cameron bands has been estimated to be 137 ± 27 km. The locations of these auroral events have also been determined and correspond to the statistical boundary of open-closed magnetic field lines, in cusp-like structures. The observed altitudes of the auroral emissions are reproduced by a Monte-Carlo model of electron transport in the Martian thermosphere for mono-energetic electrons between 40 and 200 eV. No correlation between electron fluxes measured in the upper thermosphere and nadir auroral intensity has been found. Here, we simulate auroral emissions observed both at the limb and at the nadir using electron energy spectra simultaneously measured with the ASPERA-3/ELS instrument. The simulated altitudes are in very good agreement with the observations. We find that predicted vertically integrated intensities for the various auroral emissions are overestimated, probably as a consequence of the inclination and curvature of the magnetic field line threading the aurora. However, the relative brightness of the CO and CO2+ emissions is in good agreement with the observations. [less ▲]

Detailed reference viewed: 21 (7 ULg)
Full Text
Peer Reviewed
See detailMyoferlin plays a key role in VEGFA secretion and impacts tumor-associated angiogenesis in human pancreas cancer
Fahmy, Karim ULg; Gonzalez, Arnaud; Arafa, Mohammad et al

in International Journal of Cancer = Journal International du Cancer (2016), 138

Pancreatic ductal adenocarcinoma is one of the most deadly forms of cancers with no satisfactory treatment to date. Recent studies have identified myoferlin, a ferlin family member, in human pancreas ... [more ▼]

Pancreatic ductal adenocarcinoma is one of the most deadly forms of cancers with no satisfactory treatment to date. Recent studies have identified myoferlin, a ferlin family member, in human pancreas adenocarcinoma where its expression was associated to a bad prognosis. However, the function of myoferlin in pancreas adenocarcinoma has not been reported. In other cell types, myoferlin is involved in several key plasma membrane processes such as fusion, repair, endocytosis and tyrosine kinase receptor activity. In this study, we showed that myoferlin silencing in BxPC-3 human pancreatic cancer cells resulted in the inhibition of cell proliferation in vitro and in a significant reduction of the tumor volume in chick chorioallantoic membrane assay. In addition to be smaller, the tumors formed by the myoferlin-silenced cells showed a marked absence of functional blood vessels. We further demonstrated that this effect was due, at least in part, to an inhibition of VEGFA secretion by BxPC-3 myoferlin-silenced cells. Using immunofluorescence and electron microscopy, we linked the decreased VEGFA secretion to an impairment of VEGFA exocytosis. The clinical relevance of our results was further strengthened by a significant correlation between myoferlin expression in a series of human pancreatic malignant lesions and their angiogenic status evaluated by the determination of the blood vessel density. [less ▲]

Detailed reference viewed: 79 (22 ULg)
See detailAlexander Kluge et le cinéma de l'indécision.
Cormann, Grégory ULg; Hamers, Jérémy ULg

Book published by Presses Universitaires de Liège (2016)

Detailed reference viewed: 46 (5 ULg)
Full Text
Peer Reviewed
See detailSartre in Venedig: der Mann, der in die Kälte ging
Cormann, Grégory ULg; Viehöver, Vera ULg

in Bulletin d'Analyse Phénoménologique (2016), 11

Detailed reference viewed: 36 (3 ULg)