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See detailLaplace et le développement des politiques scientifiques en Europe
Grell, Chantal; Vandersmissen, Jan ULiege

Conference (2013, March 27)

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See detailLara Croft. Avatar, femme et icône du jeu vidéo
Barnabé, Fanny ULiege

Conference given outside the academic context (2015)

La séduisante archéologue Lara Croft, protagoniste de la série de jeux Tomb Raider, est aujourd'hui l'une des icônes les plus célèbres du jeu vidéo, si bien qu'elle a même dépassé les limites de ce médium ... [more ▼]

La séduisante archéologue Lara Croft, protagoniste de la série de jeux Tomb Raider, est aujourd'hui l'une des icônes les plus célèbres du jeu vidéo, si bien qu'elle a même dépassé les limites de ce médium pour se faire connaître à un public élargi (à travers des adaptations au cinéma, en comics ou encore à travers des publicités). Toutefois, ce personnage est aussi une figure complexe qui a été reçue de manières très diverses : tantôt envisagée comme un symbole féministe (Lara Croft est une héroïne forte et indépendante, loin de la demoiselle en détresse à laquelle se cantonnaient généralement les premiers jeux vidéo), elle a aussi pu être interprétée comme une représentation caricaturale et réifiante de la femme. C'est donc d'un personnage chargé de contradictions que cette conférence propose de faire le portrait. [less ▲]

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See detailLARCH: A package for estimating multinomial, nested, and cross-nested logit models that account for semi-aggregate data
Newman, Jeffrey; Lurkin, Virginie ULiege; Garrow, Laurie

E-print/Working paper (2016)

We present a summary of important computational issues and opportunities that arise from the use of semi-aggregate data (where the explanatory data for choice scenarios are not necessarily unique for each ... [more ▼]

We present a summary of important computational issues and opportunities that arise from the use of semi-aggregate data (where the explanatory data for choice scenarios are not necessarily unique for each decision-maker) in discrete choice models. This data feature is commonly encountered with large transactional databases that have limited consumer information, such as itinerary choice modeling. We developed a software package called Larch, written in Python and C++, to take advantage of this kind of data to greatly speed the estimation of discrete choice model parameters. Benchmarking experiments against Stata (a commonly used commercial package) and Biogeme (a commonly used freeware package) based on an industry dataset for airline itinerary choice modeling applications shows that the size of the input estimation files are 50 to 100 times larger in Stata and Biogeme, respectively. Estimation times are also much faster in Larch; e.g., for a small itinerary choice problem, a multinomial logit model estimated in Larch converged in less than one second whereas the same model took almost 15 seconds in Stata and more than three minutes in Biogeme. For more complex discrete choice models, such as the ordered generalized extreme value model, estimation times were two seconds in Larch and four to five days in Biogeme. [less ▲]

Detailed reference viewed: 190 (4 ULiège)
See detailLarga existencia y breve desaparición: el adiós de una revista cultural.
Vanden Berghe, Kristine ULiege

in América. Cahiers du CRICCAL (1997), 18(II), 587-600

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See detailLa larga marcha del concepto de economia social
Defourny, Jacques ULiege

in Vuotto, Mirta (Ed.) Economia Social (2003)

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See detailLarge amplitude parallel propagating electromagnetic oscillitons
Cattaert, Tom ULiege; Verheest, F.

in Physics of Plasmas (2005), 12(1), 7

Earlier systematic nonlinear treatments of parallel propagating electromagnetic waves have been given within a fluid dynamic approach, in a frame where the nonlinear structures are stationary and various ... [more ▼]

Earlier systematic nonlinear treatments of parallel propagating electromagnetic waves have been given within a fluid dynamic approach, in a frame where the nonlinear structures are stationary and various constraining first integrals can be obtained. This has lead to the concept of oscillitons that has found application in various space plasmas. The present paper differs in three main aspects from the previous studies: first, the invariants are derived in the plasma frame, as customary in the Sagdeev method, thus retaining in Maxwell's equations all possible effects. Second, a single differential equation is obtained for the parallel fluid velocity, in a form reminiscent of the Sagdeev integrals, hence allowing a fully nonlinear discussion of the oscilliton properties, at such amplitudes as the underlying Mach number restrictions allow. Third, the transition to weakly nonlinear whistler oscillitons is done in an analytical rather than a numerical fashion. (C) 2005 American Institute of Physics. [less ▲]

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See detailLarge amplitude solitary electromagnetic waves in electron-positron plasmas
Verheest, F.; Cattaert, Tom ULiege

in Physics of Plasmas (2004), 11(6), 3078-3082

Waves in electron-positron plasmas have fundamentally different dispersion characteristics due to the equal charge-to-mass ratios between negative and positive charges, which mix different timescales, and ... [more ▼]

Waves in electron-positron plasmas have fundamentally different dispersion characteristics due to the equal charge-to-mass ratios between negative and positive charges, which mix different timescales, and are of interest in understanding aspects of pulsars and active galactic nuclei, where astrophysical electron-positron plasmas occur. Earlier systematic nonlinear treatments of parallel propagating electromagnetic waves via a reductive perturbation analysis had indicated unusual results, namely a vector equivalent of the modified Korteweg-de Vries equation. The latter is nonintegrable except in the case of linear polarization when it becomes equivalent to the scalar (integrable) modified Korteweg-de Vries equation. Here large amplitude purely stationary nonlinear solitary waves are studied in their own reference frame via the McKenzie approach. The behavior of the wave magnetic field can be expressed through an energy integral that involves the Mach number of the structure. Possible solitons are super-Alfvenic and occur symmetrically for positive or negative fields, owing to the obvious symmetry between positive and negative charges with the same mass. The limits on the allowable Mach numbers and soliton amplitudes have also been computed. (C) 2004 American Institute of Physics. [less ▲]

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See detailLarge amplitude solitary waves in space plasmas
Cattaert, Tom ULiege

Doctoral thesis (2006)

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See detailA Large and Consistent Phylogenomic Dataset Supports Sponges as the Sister Group to All Other Animals.
Simion, Paul; Philippe, Herve; Baurain, Denis ULiege et al

in Current Biology (2017)

Resolving the early diversification of animal lineages has proven difficult, even using genome-scale datasets. Several phylogenomic studies have supported the classical scenario in which sponges (Porifera ... [more ▼]

Resolving the early diversification of animal lineages has proven difficult, even using genome-scale datasets. Several phylogenomic studies have supported the classical scenario in which sponges (Porifera) are the sister group to all other animals ("Porifera-sister" hypothesis), consistent with a single origin of the gut, nerve cells, and muscle cells in the stem lineage of eumetazoans (bilaterians + ctenophores + cnidarians). In contrast, several other studies have recovered an alternative topology in which ctenophores are the sister group to all other animals (including sponges). The "Ctenophora-sister" hypothesis implies that eumetazoan-specific traits, such as neurons and muscle cells, either evolved once along the metazoan stem lineage and were then lost in sponges and placozoans or evolved at least twice independently in Ctenophora and in Cnidaria + Bilateria. Here, we report on our reconstruction of deep metazoan relationships using a 1,719-gene dataset with dense taxonomic sampling of non-bilaterian animals that was assembled using a semi-automated procedure, designed to reduce known error sources. Our dataset outperforms previous metazoan gene superalignments in terms of data quality and quantity. Analyses with a best-fitting site-heterogeneous evolutionary model provide strong statistical support for placing sponges as the sister-group to all other metazoans, with ctenophores emerging as the second-earliest branching animal lineage. Only those methodological settings that exacerbated long-branch attraction artifacts yielded Ctenophora-sister. These results show that methodological issues must be carefully addressed to tackle difficult phylogenetic questions and pave the road to a better understanding of how fundamental features of animal body plans have emerged. [less ▲]

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See detailThe Large Binocular Telescope Interferometer & Adaptive Optics System: On-sky Performance and Results
Bailey, Vanessa; Hinz, Philip; Vaitheeswaran, Vidhya et al

in Exploring the Formation and Evolution of Planetary Systems (2014, January 01)

Increasing spatial resolution and contrast capabilities will make possible new direct detections of exoplanets, exozodis, and circumstellar disks. The Large Binocular Telescope Interferometer (LBTI) has ... [more ▼]

Increasing spatial resolution and contrast capabilities will make possible new direct detections of exoplanets, exozodis, and circumstellar disks. The Large Binocular Telescope Interferometer (LBTI) has been engineered to sit at the combined focus of the Large Binocular Telescope's two 8.4m apertures. Both apertures are equipped with 672-actuator deformable secondary mirrors, the first of the next generation of ``extreme'' adaptive optics (AO) systems. We present an overview of the LBTI AO instrument suite and detail current on-sky performance. [less ▲]

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See detailLarge binocular telescope interferometer adaptive optics: on-sky performance and lessons learned
Bailey, Vanessa P.; Hinz, Philip M.; Puglisi, Alfio T. et al

in Adaptive Optics Systems IV (2014, July 01)

The Large Binocular Telescope Interferometer is a high contrast imager and interferometer that sits at the combined bent Gregorian focus of the LBT's dual 8.4 m apertures. The interferometric science ... [more ▼]

The Large Binocular Telescope Interferometer is a high contrast imager and interferometer that sits at the combined bent Gregorian focus of the LBT's dual 8.4 m apertures. The interferometric science drivers dictate 0.1" resolution with 10[SUP]3[/SUP] - 10[SUP]4[/SUP] contrast at 10 μm, while the 4 μm imaging science drivers require even greater contrasts, but at scales <0.2". In imaging mode, LBTI's Adaptive Optics system is already delivering 4 μm contrast of 10[SUP]4[/SUP] - 10[SUP]5[/SUP] at 0.3" - 0.75" in good conditions. Even in poor seeing, it can deliver up to 90% Strehl Ratio at this wavelength. However, the performance could be further improved by mitigating Non-Common Path Aberrations. Any NCPA remedy must be feasible using only the current hardware: the science camera, the wavefront sensor, and the adaptive secondary mirror. In preliminary testing, we have implemented an "eye doctor" grid search approach for astigmatism and trefoil, achieving 5% improvement in Strehl Ratio at 4 μm, with future plans to test at shorter wavelengths and with more modes. We find evidence of NCPA variability on short timescales and discuss possible upgrades to ameliorate time-variable effects. [less ▲]

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See detailLarge Binocular Telescope Observations of Europa Occulting Io's Volcanoes at 4.8 $\mu$m
Skrutskie, M. F.; Conrad, A.; Resnick, A. et al

Conference (2015)

On 8 March 2015 Europa passed nearly centrally in front of Io. The Large Binocular Telescope observed this event in dual-aperture AO-corrected Fizeau interferometric imaging mode using the mid-infrared ... [more ▼]

On 8 March 2015 Europa passed nearly centrally in front of Io. The Large Binocular Telescope observed this event in dual-aperture AO-corrected Fizeau interferometric imaging mode using the mid-infrared imager LMIRcam operating behind the Large Binocular Telescope Interferometer (LBTI) at a broadband wavelength of 4.8 μm (M-band). Occultation light curves generated from frames recorded every 123 milliseconds show that both Loki and Pele/Pillan were well resolved. Europa's center shifted by 2 kilometers relative to Io from frame-to-frame. The derived light curve for Loki is consistent with the double-lobed structure reported by Conrad et al. (2015) using direct interferometric imaging with LBTI. [less ▲]

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See detailLarge carrion beetles (Coleoptera, Silphidae) in Western Europe: a review
Dekeirsschieter, Jessica ULiege; Verheggen, François ULiege; Lognay, Georges ULiege et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(3), 425-437

This review focuses on carrion beetles (Coleoptera, Silphidae) of the Western Palearctic and their potential use in forensic entomology as bioindicators. Few studies have looked at Silphidae in forensic ... [more ▼]

This review focuses on carrion beetles (Coleoptera, Silphidae) of the Western Palearctic and their potential use in forensic entomology as bioindicators. Few studies have looked at Silphidae in forensic context and investigations. However, some Silphidae present the desirable characteristics of some Diptera used in postmortem estimates and thus may extend the minimum postmortem interval (PMImin). We review here the taxonomy and distribution of Western Palearctic Silphidae. The anatomical and morphological characteristics of both subfamilies are described for adults and larvae. The biology and ecology of silphids are also summarized for Silphinae and Nicrophorinae. A specific chapter gives an overview of the current uses of Silphidae in forensic entomology as postmortem indicator. [less ▲]

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See detailLarge Changes In The Crac Segment Of Gp41 Of Hiv Do Not Destroy Fusion Activity If The Segment Interacts With Cholesterol
Vishwanathan, Sa.; Thomas, Annick ULiege; Brasseur, Robert ULiege et al

in Biochemistry (2008), 47(45),

The membrane-proximal external region (MPER) of the gp41 fusion protein of HIV is highly conserved among isolates of this virus and is considered a target for vaccine development. This region also appears ... [more ▼]

The membrane-proximal external region (MPER) of the gp41 fusion protein of HIV is highly conserved among isolates of this virus and is considered a target for vaccine development. This region also appears to play a role in membrane fusion as well as localization of the virus to cholesterol-rich domains in membranes. The carboxyl terminus of MPER has the sequence LWYIK and appears to have an important role in cholesterol interactions. We have tested how amino acid substitutions that would affect the conformational flexibility of this segment could alter its interaction with cholesterol. We studied a family of peptides (all peptides as N-acetyl-peptide amides) with P, G, or A substituting for W and I of the LWYIK sequence. The peptide having the greatest effect on cholesterol distribution in membranes was the most flexible one, LGYGK. The corresponding mutation in gp41 resulted in a protein retaining 72% of the fusion activity of the wild-type protein. Two other peptides were synthesized, also containing two Gly residues, GWGIK and LWGIG, and did not have the ability to sequester cholesterol as efficiently as LGYGK did. Making the corresponding mutants of gp41 showed that these other two double Gly substitutions resulted in proteins that were much less fusogenic, although they were equally well expressed at the cell surface. The study demonstrates that drastic changes can be made in the LWYIK segment with the retention of a significant fraction of the fusogenic activity, as long as the mutant proteins interact with cholesterol. [less ▲]

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See detailLarge colonial organisms with coordinated growth in oxygenated environments 2.1 Gyr ago
El Albani, Abder; Bengtson, Stefan; Canfield, Donald et al

in Nature (2010), 466

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See detailLarge current enhancement in n-MOSFETs with strained Si on insulator
Mantl, S.; Buca, D.; Zhao, Q. et al

in International Semiconductor Device Research Symposium, 2007 (2007)

As scaling of the critical transistor dimensions below 65 nm has been slowed down, the implementation of novel materials, especially high mobility channel materials is most attractive to boost the ... [more ▼]

As scaling of the critical transistor dimensions below 65 nm has been slowed down, the implementation of novel materials, especially high mobility channel materials is most attractive to boost the transistor performance. Applying strain to silicon has become a successful route. The electron mobility can be enhanced by biaxial strain introduced into Si by epitaxial growth of Si on a strain relaxed SiGe layer or by so called process induced methods applied directly on transistor level. The combination of strained Si and SOI is particularly promising due to the combination of the enhanced mobilities and the inherent advantages of SOI. First long channel n-MOSFETs with gate lengths of 5 to 50 mum and a 6.6 nm thick SiO2 gate dielectric were fabricated. For comparison, devices on unstrained SOI were made. The transfer characteristics of a fully depleted sSOI-MOSFET with a gate length of 5 mum and a gate width of 20 mum indicating an inverse sub-threshold slope of 75mV/dec. [less ▲]

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See detailLarge deformation FEMLIP drained analysis of a vertical cut
Cuomo, Sabatino; Prime, Noémie ULiege; Iannone, Anna et al

in Acta Geotecnica (2012)

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See detailLarge deployable telescopes—also for lm-wavelengths?
Baier, Horst; Datashvili, Leri; Endler, Stephan et al

in CEAS Space Journal (2013), 5(3-4), 117-124

New demands for space and earth observations drive the need for large apertures of 10 m and higher in telescopes. This requires new types of alternative lightweight and deployable primary reflector or ... [more ▼]

New demands for space and earth observations drive the need for large apertures of 10 m and higher in telescopes. This requires new types of alternative lightweight and deployable primary reflector or lens concepts with aerial densities of\3 kg/m2. Some syntheses between optical and especially mechanical and material aspects for large planar photon sieves and non-imaging telescopes are discussed. Focus is put on large planar and highly perforated membranes for photon sieves and shell-membrane type deployable (parabolic) reflectors, respectively. The reflecting surface of the latter is composed of specific C-fiber reinforces silicone (CFRS) material. In addition to possible shape control, emphasis is also given to reflective coating of CFRS. Engineering challenges requiring future activities are identified. [less ▲]

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See detailLarge deviation spectra based on wavelet leaders
Bastin, Françoise ULiege; Esser, Céline ULiege; Jaffard, Stéphane ULiege

in Revista Matemática Iberoamericana (2016), 32(3), 859-890

We introduce a new multifractal formalism, based on distributions of wavelet leaders, which allows to detect non-concave and decreasing multifractal spectra, and we investigate the properties of the ... [more ▼]

We introduce a new multifractal formalism, based on distributions of wavelet leaders, which allows to detect non-concave and decreasing multifractal spectra, and we investigate the properties of the associated function spaces. [less ▲]

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See detailLarge displacement formulations for elastic bodies
Fraeijs de Veubeke, Baudouin ULiege

Report (1969)

Detailed reference viewed: 26 (2 ULiège)