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See detailCollective dominance: An overview of national case law
Petit, Nicolas ULg; Neyrinck, Norman ULg

in e-Competitions (2011), N°39129

This article aims at providing an overview of the national case law on collective dominance in Europe. We observe that overall, most domestic decisions have manifestly integrated the EU case law and ... [more ▼]

This article aims at providing an overview of the national case law on collective dominance in Europe. We observe that overall, most domestic decisions have manifestly integrated the EU case law and followed the shift from a structural approach towards a more behavioral approach. We higlight several protruding cases on the definition of the notion of abuse and the most creative remedies devised by national competition authorities so far. [less ▲]

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See detailCollective effects during crystal growth in the presence of mobile nonreactive impurities: experiments and simulations
Vandewalle, Nicolas ULg; Ausloos, Marcel ULg; Cloots, Rudi ULg

in Journal of Crystal Growth (1999), 197(1-2), 317-324

The growth of a solid phase in a liquid medium containing randomly dispersed mesoscopic impurities is discussed. Particles represent hindrances for the growth front. They can remain static or can be ... [more ▼]

The growth of a solid phase in a liquid medium containing randomly dispersed mesoscopic impurities is discussed. Particles represent hindrances for the growth front. They can remain static or can be pushed by the advancing interface. The physics of the collective particle motion is outlined. Experiments with A12O3-SiO2 impurities in KC1 crystal serve as illustrative examples. The collective effects due to the particle concentration are investigated through a kinetic growth model. [less ▲]

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See detailCollective Entrepreneurship, a Solution to Conflicting Institutional Logics in the Entrepreneurship Process?
Dufays, Frédéric ULg

in Teirlinck, Peter; Kelchtermans, Stijn; de Beule, Filip (Eds.) The Proceedings of the 8th European Conference on Innovation and Entrepreneurship ECIE 2013 (2013)

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See detailCollective fluctuations in ordered fluids investigated by two-dimensional electron-electron double resonance spectroscopy
Fresch, Barbara ULg; Frezzato, Diego; Moro, Giorgio J. et al

in Journal of Physical Chemistry B (2006), 110

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See detailCollective motion and oscillator synchronization
Sepulchre, Rodolphe ULg; Paley, Derek; Leonard, Naomi

in Cooperative Control (2005)

This paper studies connections between phase models of coupled oscillators and kinematic models of groups of self-propelled particles. These connections are exploited in the analysis and design of ... [more ▼]

This paper studies connections between phase models of coupled oscillators and kinematic models of groups of self-propelled particles. These connections are exploited in the analysis and design of feedback control laws for the individuals that stabilize collective motions for the group. [less ▲]

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See detailCollective motion, sensor networks, and ocean sampling
Leonard, Naomi Ehrich; Paley, Derek; Lekien, François et al

in Proceedings of the IEEE (2007), 95(1), 48-74

This paper addresses the design of mobile sensor networks for optimal data collection. The development is strongly motivated by the application to adaptive ocean sampling for an autonomous ocean observing ... [more ▼]

This paper addresses the design of mobile sensor networks for optimal data collection. The development is strongly motivated by the application to adaptive ocean sampling for an autonomous ocean observing and prediction system. A performance metric, used to derive optimal paths for the network of mobile sensors, defines the optimal data set as one which minimizes error in a model estimate of the sampled field. Feedback control laws are presented that stably coordinate sensors on structured tracks that have been optimized over a minimal set of parameters. Optimal, closed-loop solutions are computed in a number of low-dimensional cases to illustrate the methodology. Robustness of the performance to the influence of a steady flow field on relatively slow-moving mobile sensors is also explored. [less ▲]

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See detailCollective Motion: Bistability and Trajectory Tracking
Paley, Derek; Leonard, Naomi; Sepulchre, Rodolphe ULg

in Proceedings of the 43rd IEEE Conference on Decision and Control (2004, December)

This paper presents analysis and application of steering control laws for a network of self-propelled, planar particles. We explore together the two stably controlled group motions, parallel motion and ... [more ▼]

This paper presents analysis and application of steering control laws for a network of self-propelled, planar particles. We explore together the two stably controlled group motions, parallel motion and circular motion, for modeling and design purposes. We show that a previously considered control law simultaneously stabilizes both parallel and circular group motion, leading to bistability and hysteresis. We also present behavior primitives that enable piecewise-linear network trajectory tracking. [less ▲]

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See detailCollective optimization over average quantities
Scardovi, Luca; Sepulchre, Rodolphe ULg

in Proceedings of the 45th IEEE Conference on Decision and Control (2006)

This paper addresses the design of algorithms for the collective optimization of a cost function defined over average quantities in the presence of limited communication. We argue that several meaningful ... [more ▼]

This paper addresses the design of algorithms for the collective optimization of a cost function defined over average quantities in the presence of limited communication. We argue that several meaningful collective optimization problems can be formulated in this way. As an application of the proposed approach, we propose a novel algorithm that achieves synchronization or balancing in phase models of coupled oscillators under mild connectedness assumptions on the (possibly time-varying and unidirectional) communication graphs. [less ▲]

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See detailCollective pulsational velocity broadening due to gravity modes as a physical explanation for macroturbulence in hot massive stars
Aerts, C.; Puls, J.; Godart, Mélanie ULg et al

in Astronomy and Astrophysics (2009), 508

Aims. We aimed at finding a physical explanation for the occurrence of macroturbulence in the atmospheres of hot massive stars, a phenomenon found in observations for more than a decade but that remains ... [more ▼]

Aims. We aimed at finding a physical explanation for the occurrence of macroturbulence in the atmospheres of hot massive stars, a phenomenon found in observations for more than a decade but that remains unexplained.<BR /> Methods: We computed time series of line profiles for evolved massive stars broadened by rotation and by hundreds of low-amplitude nonradial gravity-mode pulsations which are predicted to be excited for evolved massive stars.<BR /> Results: In general, line profiles based on macrotubulent broadening can mimic those subject to pulsational broadening. In several cases, though, good fits require macroturbulent velocities that pass the speed of sound for realistic pulsation amplitudes. Moreover, we find that the rotation velocity can be seriously underestimated by using a simple parameter description for macroturbulence rather than an appropriate pulsational model description to fit the line profiles.<BR /> Conclusions: We conclude that macroturbulence is a likely signature of the collective effect of pulsations. We provide line diagnostics and their typical values to decide whether or not pulsational broadening is present in observed line profiles, as well as a procedure to avoid an inaccurate estimation of the rotation velocity. [less ▲]

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See detailCollective Redress in Multiple Perspectives the challenges of integrating competition law, consumer law and the construction of a European judicial area
Sibony, Anne-Lise ULg

Scientific conference (2011, April 07)

Collective redress ought to be looked at from several different perspectives: that of competition law, that of consumer law and that of building a European judicial area. This paper looks at the ... [more ▼]

Collective redress ought to be looked at from several different perspectives: that of competition law, that of consumer law and that of building a European judicial area. This paper looks at the challengenges posed by the necessity to hold all three perspective together. [less ▲]

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See detailCollective Retrieval hy Autonomous Rohots
Meyer, Patrick ULg

Conference (2004)

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See detailCollectors of Japanese Art in belgium : between exotism and scholarship
Bawin, Julie ULg

in Oriental Fascination. 1889-1915. The Japonisme in Belgium (2008)

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See detailCollider aspects of flavor physics at high Q
Lari, T.; Pape, L.; Porod, W. et al

in European Physical Journal C -- Particles & Fields (2008), 57(1-2), 183-307

This chapter of the 'Flavor in the era of LHC' workshop report discusses flavor-related issues in the production and decays of heavy states at the LHC at high momentum transfer Q, both from the ... [more ▼]

This chapter of the 'Flavor in the era of LHC' workshop report discusses flavor-related issues in the production and decays of heavy states at the LHC at high momentum transfer Q, both from the experimental and the theoretical perspective. We review top quark physics, and discuss the flavor aspects of several extensions of the standard model, such as supersymmetry, little Higgs models or models with extra dimensions. This includes discovery aspects, as well as the measurement of several properties of these heavy states. We also present publicly available computational tools related to this topic. © Springer-Verlag / Società Italiana di Fisica 2008. [less ▲]

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See detailColliding particles carrying nonzero orbital angular momentum
Ivanov, Igor ULg

in Physical Review. D : Particles and Fields (2011), 83(9), 093001

Photons carrying nonzero orbital angular momentum (twisted photons) are well-known in optics. Recently, using Compton backscattering to boost optical twisted photons to high energies was suggested ... [more ▼]

Photons carrying nonzero orbital angular momentum (twisted photons) are well-known in optics. Recently, using Compton backscattering to boost optical twisted photons to high energies was suggested. Twisted electrons in the intermediate energy range have also been produced recently. Thus, collisions involving energetic twisted particles seem to be feasible and represent a new tool in high-energy physics. Here we discuss some generic features of scattering processes involving twisted particles in the initial and/or final state. In order to avoid additional complications arising from nontrivial polarization states, we focus here on scalar fields only. We show that processes involving twisted particles allow one to perform a Fourier analysis of the plane-wave cross section with respect to the azimuthal angles of the initial particles. In addition, using twisted states, one can probe the autocorrelation function of the amplitude, which is inaccessible in the plane-wave collisions. Finally, we discuss prospects for experimental study of these effects. [less ▲]

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See detailColliding Wind Signatures in Early-Type Binaries
Rauw, Grégor ULg

in Revista Mexicana de Astronomia y Astrofisica Conference Series (2008, August 01)

Observations of early-type binaries not only allow us to establish the fundamental properties of massive stars in a model-independent fashion, but furthermore provide important information on the ... [more ▼]

Observations of early-type binaries not only allow us to establish the fundamental properties of massive stars in a model-independent fashion, but furthermore provide important information on the interactions of their stellar winds. The signatures of wind-wind interactions have been found over a broad range of wavelengths and energies, from the radio domain to X-rays and possibly gamma-rays. In this review, I discuss some results of the study of wind interactions in Wolf-Rayet and O-star binaries. [less ▲]

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See detailColliding-wind binaries as non-thermal X-ray emitters: an observational investigation from XMM-Newton to next generation X-ray observatories
De Becker, Michaël ULg

Poster (2007, December)

The investigation of massive stars in the radio domain revealed about 25 years ago that some of them are synchrotron emitters, showing that these objects are able to accelerate particles up to ... [more ▼]

The investigation of massive stars in the radio domain revealed about 25 years ago that some of them are synchrotron emitters, showing that these objects are able to accelerate particles up to relativistic velocities. In this context, non-thermal emission processes such as inverse Compton scattering are expected to be at work in the high-energy domain. For this reason, an observational campaign devoted to the X-ray investigation of non-thermal radio emitters has been carried out with XMM-Newton. However, considering the rather strong thermal X-ray emission from these systems below 10 keV, XMM-Newton does not appear to be the ideal observatory to detect their putative non-thermal X-rays. As a consequence, the advent of next generation X-ray observatories with a bandpass extending significantly above 10 keV (SIMBOL-X, XEUS, NEXT) is expected to provide important results related to the non-thermal high-energy emission from colliding-wind binaries and their capability to accelerate particles. [less ▲]

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See detailColliding-winds in massive star binaries: expectations from radio to gamma-rays
De Becker, Michaël ULg

Conference (2010, December 02)

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See detailCollimator Effects in High Resolution X-ray Computed Tomography
Verly, Jacques ULg

in IEEE Transactions on Medical Imaging (1982), MI-1(2), 122-136

Detailed reference viewed: 5 (2 ULg)