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See detailQuarante ans de céréaliculture en Belgique : évolution des superficies, des rendements et du nombre d'exploitations
Burny, Philippe ULg

in CRA-w; FUSAGx (Eds.) 40 ans Livre blanc Céréales-Gembloux : Economie de la production céréalière en Belgique : Evolution en 40 ans de Politique Agricole Commune et perspectives d’avenir (2007)

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See detailQuarante ans de céréaliculture en Belgique : évolution des superficies, des rendements et du nombre d’exploitations
Burny, Philippe ULg

in Faculté universitaire des Sciences agronomiques de Gembloux; Centre wallon de Recherches agronomiques (Eds.) 40 ans Livre blanc Céréales-Gembloux "Economie de la production céréalière en Belgique : évolution en 40 ans de Politique Agricole Commune et perspectives d’avenir" (2007)

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See detailLe quarantième anniversaire de l’Orchestre Philharmonique de Liège
Pirenne, Christophe ULg; Mairlot, Éric

Conference given outside the academic context (2000)

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See detailQuark and gluon condensates and the small x limit of the nucleon structure functions
Cudell, Jean-René ULg; Donnachie, A.; Landshoff, P. V.

in Nuclear Physics B (1989), 322

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See detailQUARK CONDENSATES, POMERON STRUCTURE AND DISTRIBUTION FUNCTIONS
Cudell, Jean-René ULg

in Tran Thanh Van, Jean (Ed.) Moriond 1989: Hadronic interactions (1989)

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See detailQuark model analysis of the Sivers function
Courtoy, Aurore ULg; Fratini, F.; Scopetta, S. et al

in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2008), 78(3),

We develop a formalism to evaluate the Sivers function. The approach is well suited for calculations which use constituent quark models to describe the structure of the nucleon. A nonrelativistic ... [more ▼]

We develop a formalism to evaluate the Sivers function. The approach is well suited for calculations which use constituent quark models to describe the structure of the nucleon. A nonrelativistic reduction of the scheme is performed and applied to the Isgur-Karl model of hadron structure. The results obtained are consistent with a sizable Sivers effect and the signs for the u and d flavor contributions turn out to be opposite. This pattern is in agreement with the one found analyzing, in the same model, the impact parameter dependent generalized parton distributions. The Burkardt sum rule turns out to be fulfilled to a large extent. We estimate the QCD evolution of our results from the momentum scale of the model to the experimental one and obtain reasonable agreement with the available data. © 2008 The American Physical Society. [less ▲]

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See detailQuark model: recent issues
Stancu, Floarea ULg

Conference (2007)

In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave ... [more ▼]

In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave function of baryons and the possible interpretation of open charm and of new charmonium-type resonances as tetraquarks. In the second part I show support for the quark model dynamics obtained in a model independent way from the 1/Nc expansion approach of QCD which proved to be successful in describing baryon properties. [less ▲]

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See detailThe quark orbital angular momentum from Wigner distributions and light-cone wave functions
Lorce, Cédric ULg; Pasquini, Barbara; Xiong, Xiaonu et al

in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2012), D85

We investigate the quark orbital angular momentum of the nucleon in the absence of gauge-field degrees of freedom, by using the concept of the Wigner distribution and the light-cone wave functions of the ... [more ▼]

We investigate the quark orbital angular momentum of the nucleon in the absence of gauge-field degrees of freedom, by using the concept of the Wigner distribution and the light-cone wave functions of the Fock-state expansion of the nucleon. The quark orbital angular momentum is obtained from the phase-space average of the orbital angular momentum operator weighted with the Wigner distribution of unpolarized quarks in a longitudinally polarized nucleon. We also derive the light-cone wave-function representation of the orbital angular momentum. In particular, we perform an expansion in the nucleon Fock-state space and decompose the orbital angular momentum into the N-parton state contributions. Explicit expressions are presented in terms of the light-cone wave functions of the three-quark Fock state. Numerical results for the up and down quark orbital angular momenta of the proton are shown in the lightcone constituent quark model and the light-cone chiral quark-soliton model. [less ▲]

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See detailThe quark propagator from the Dyson-Schwinger equations: (I). The chiral solution
Cudell, Jean-René ULg; Gentles, A. J.; Ross, D. A.

in Nuclear Physics B (1995), 440

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See detailQuark transverse charge densities in the Delta(1232) from lattice QCD
Alexandrou, Constantia; Korzec, Tomasz; Giannis, Koutsou et al

in Nuclear Physics A (2009), A825

We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for ... [more ▼]

We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for the $\Delta (1232)$ isobar using lattice QCD. The transverse charge densities for a transversely polarized spin-3/2 particle are characterized by monopole, dipole, quadrupole, and octupole patterns representing the structure beyond that of a pure point-like spin-3/2 particle.We present lattice QCD results for the $\Delta$-isobar electromagnetic form factors for pion masses down to approximatively 350 MeV for three cases: quenched QCD, two-degenerate flavors of dynamicalWilson quarks, and three flavors of quarks using a mixed action that combines domain wall valence quarks and dynamical staggered sea quarks. We extract transverse quark charge densities from these lattice results and find that the $Delta$ is prolately deformed, as indicated by the fact that the quadrupole moment $G_{E2}(0)$ is larger than the value −3 characterizing a point particle and the fact that the transverse charge density in a $\Delta^+$ of maximal transverse spin projection is elongated along the axis of the spin. [less ▲]

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See detailQuark Wigner Distributions and Orbital Angular Momentum
Lorce, Cédric ULg; Pasquini, B.

in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2011), D84

We study the Wigner functions of the nucleon which provide multidimensional images of the quark distributions in phase space. These functions can be obtained through a Fourier transform in the transverse ... [more ▼]

We study the Wigner functions of the nucleon which provide multidimensional images of the quark distributions in phase space. These functions can be obtained through a Fourier transform in the transverse space of the generalized transverse-momentum dependent parton distributions. They depend on both the transverse position and the three-momentum of the quark relative to the nucleon, and therefore combine in a single picture all the information contained in the generalized parton distributions and the transverse-momentum dependent parton distributions. We focus the discussion on the distributions of unpolarized/longitudinally polarized quark in an unpolarized/longitudinally polarized nucleon. In this way, we can study the role of the orbital angular momentum of the quark in shaping the nucleon and its correlations with the quark and nucleon polarizations. The quark orbital angular momentum is also calculated from its phase-space average weighted with the Wigner distribution of unpolarized quarks in a longitudinally polarized nucleon. The corresponding results obtained within different light-cone quark models are compared with alternative definitions of the quark orbital angular momentum, as given in terms of generalized parton distributions and transverse-momentum dependent parton distributions. [less ▲]

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See detailQuartier nègre: nouveau monde et nouveau code
Demoulin, Laurent ULg

in Traces (2012), 20

Le roman Quartier nègre de Simenon est lu ici à la lumière de l'essai de Goffman La Mise en scène de la vie quotidienne.

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See detailQuartiere non è un quartiere : Racconto con foto quasi immaginarie
Curreri, Luciano ULg

Book published by Amos (2013)

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See detailLes quartiers 'ghettos' : des étiquettes collées sur des phénomènes complexes?
Ruelle, Christine ULg

Conference given outside the academic context (2014)

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See detailLes quartiers durables : processus de production et reproductibilité
Marique, Anne-Françoise ULg

Master's dissertation (2009)

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See detailLes quartiers urbains existants peuvent-ils devenir des "quartiers durables" et surtout, comment? L'expérience du projet SUN dans le quartier St-Léonard (Liège).
Ruelle, Christine ULg; Stangherlin, Gregor

in Cahiers Nouveaux (Les) (2012), n°84

L'article retrace brièvement la démarche de recherche-action menée dans le cadre du projet Interreg IVA SUN, qui avait pour objectif d'explorer les pistes d'action publique possibles afin de soutenir la ... [more ▼]

L'article retrace brièvement la démarche de recherche-action menée dans le cadre du projet Interreg IVA SUN, qui avait pour objectif d'explorer les pistes d'action publique possibles afin de soutenir la transition des quartiers urbains vers un développement durable. [less ▲]

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See detailQuartiles d'une série statistique univariée : quelles définitions ?
Henry, Valérie ULg

in Losanges (2010), 7

Sur base d'une étude comparative de la littérature sur le sujet, nous proposons une définition du premier quartile qui permette de rester en cohérence avec la définition de celui-ci pour une variable ... [more ▼]

Sur base d'une étude comparative de la littérature sur le sujet, nous proposons une définition du premier quartile qui permette de rester en cohérence avec la définition de celui-ci pour une variable quantitative dont les données ont été réparties en classes. [less ▲]

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See detailIl quarto musicista
Emmanuel, François; Ricciardi, Stefania ULg

Book published by San Paolo (2003)

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See detailQuasar Candidates in a Large Field Centered around NGC450 and the Discovery of a New Very Interesting Pair of Quasars
Swings, Jean-Pierre ULg; Surdej, Jean ULg; Henry, A. et al

in Revista Mexicana de Astronomia y Astrofisica, vol. 10 (1985), 10

Abstract image available at: http://esoads.eso.org/abs/1985RMxAA..10...91S

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See detailQuasar Host Orientation and Polarization: Insights into the Type 1/Type 2 Dichotomy
Borguet, Benoît ULg; Hutsemekers, Damien ULg; Letawe, Géraldine ULg et al

in Revista Mexicana de Astronomía y Astrofísica (2008), 32

We investigate correlations between the optical linear polarization position angle and the orientation of the host galaxy/extended emission of Type 1 and Type 2 Radio-Loud (RL) and Radio-Quiet (RQ ... [more ▼]

We investigate correlations between the optical linear polarization position angle and the orientation of the host galaxy/extended emission of Type 1 and Type 2 Radio-Loud (RL) and Radio-Quiet (RQ) quasars. We have used high resolution Hubble Space Telescope (HST) data and deconvolution process to obtain a good determination of the host galaxy orientation. With these new measurements and a compilation of data from the literature, we find a significant correlation between the polarization position angle and the position angle of the major axis of the host galaxy/extended emission. The correlation appears different for Type 1 and Type 2 objects and depends on the redshift of the source. Interpretations in the framework of the unification model are discussed. [less ▲]

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