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See detailInfluence of noise correction on intra- and inter-subject variability of quantitative metrics in diffusion kurtosis imaging
André, Elodie ULg; Grinberg, Farida; Farrher, Ezequiel et al

in PLoS ONE (in press)

Diffusion kurtosis imaging (DKI) is a promising extension of diffusion tensor imaging, giving new insights into the white matter microstructure and providing new biomarkers. Given the rapidly increasing ... [more ▼]

Diffusion kurtosis imaging (DKI) is a promising extension of diffusion tensor imaging, giving new insights into the white matter microstructure and providing new biomarkers. Given the rapidly increasing number of studies, DKI has a potential to establish itself as a valuable tool in brain diagnostics. However, to become a routine procedure, DKI still needs to be improved in terms of robustness, reliability, and reproducibility. As it requires acquisitions at higher diffusion31 weightings, results are more affected by noise than in diffusion tensor imaging. The lack of standard procedures for post-processing, especially for noise correction, might become a significant obstacle for the use of DKI in clinical routine limiting its application. We considered two noise correction schemes accounting for the noise properties of multichannel phased-array coils, in order to improve the data quality at signal-to-noise ratio (SNR) typical for DKI. The SNR dependence of estimated DKI metrics such as mean kurtosis (MK), mean diffusivity (MD) and fractional anisotropy (FA) is investigated for these noise correction approaches in Monte Carlo simulations and in in vivo human studies. The intra-subject reproducibility is investigated in a single subject study by varying the SNR level and SNR spatial distribution. Then the impact of the noise correction on inter-subject variability is evaluated in a homogeneous sample of 25 healthy volunteers. Results show a strong impact of noise correction on the MK estimate, while the estimation of FA and MD was affected to a lesser extent. Both intra- and inter-subject SNR related variability of the MK estimate is considerably reduced after correction for the noise bias, providing more accurate and reproducible measures. In this work, we have proposed a straightforward method that improves accuracy of DKI metrics. This should contribute to standardization of DKI applications in clinical studies and making valuable inferences in group analysis and longitudinal studies. [less ▲]

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See detailCompte rendu de l'ouvrage de Frédéric MARCHESANI, Sur les traces des anciens "pays" de Wallonie
George, Philippe ULg

in Trésor de Liège. Bulletin trimestriel (in press)

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See detailBasic Principles of White Dwarf Asteroseismology
Fontaine, Gilles; Brassard, Pierre; Charpinet, Stéphane et al

in Napiwotzki, R.; Burleigh, M. (Eds.) The White Dwarfs Stars (in press)

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See detailApproches ergonomiques et approches psychosociologiques de la formation : mise en perspective conceptuelle et praxéologique
Faulx, Daniel ULg; Petit, Lucie

in Actes du 16ème Congrès de Psychologie du Travail et des Organisation de Langue Française. (in press)

From both a scientific and a practical point of view, two major trends seem to presently rule the adult training field: the psychosociological trend and the ergonomic trend. Though each one has widely ... [more ▼]

From both a scientific and a practical point of view, two major trends seem to presently rule the adult training field: the psychosociological trend and the ergonomic trend. Though each one has widely contributed in developing training in organizational human resources development, we fail to see any significant level of understanding between the two trends or any dialogue based on scientific objectivity. The aim of this present paper is to hopefully initiate a dialogue with an eye towards development in training practices. A better understanding of these main approaches would bring help to those who seek to train personnel and to better orientate their choice of training. [less ▲]

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See detailA European survey on attitudes towards pain and end-of-life issues in locked-in syndrome
Demertzi, Athina ULg; Jox, Ralf J; Racine, Eric et al

in Brain Injury (in press)

Objectives: Patients with locked-in syndrome often self-report a higher quality of life than generally expected. This study reports third-person attitudes towards several salient issues on locked-in ... [more ▼]

Objectives: Patients with locked-in syndrome often self-report a higher quality of life than generally expected. This study reports third-person attitudes towards several salient issues on locked-in syndrome. Methods: Close-ended survey among conference attendees from 33 European countries. Analysis included chi-square tests and logistic regressions. Results: From the 3332 respondents (33% physicians, 18% other clinicians, 49% other professions; 47% religious), 90% agreed that patients with locked-in syndrome can feel pain. The majority (75%) disagreed with treatment withdrawal, but 56% did not wish to be kept alive if they imagined themselves in this condition (p50.001). Religious and southern Europeans opposed to treatment withdrawal more often than non-religious (p50.001) and participants from the North (p¼0.001). When the locked-in syndrome was compared to disorders of consciousness, more respondents endorsed that being in a chronic locked-in syndrome was worse than being in a vegetative state or minimally conscious state for patients (59%) than they thought for families (40%, p50.001). Conclusions: Personal characteristics mediate opinions about locked-in syndrome. The dissociation between personal preferences and general opinions underlie the difference in perspective in disability. Ethical responses to dilemmas involving patients with locked-in syndrome should consider the diverging ethical attitudes of stakeholders. [less ▲]

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See detailEffects of the presence of free lime nodules into concrete: experimentation and modelling
Courard, Luc ULg; Degée, Hervé ULg; Darimont, Anne ULg

in Cement and Concrete Research (in press)

When nodules of lime are embedded into concrete, the expansion accompanying the transformation of CaO into Ca(OH)2 induces stresses and strains in both the lime nodule and in the concrete matrix. The ... [more ▼]

When nodules of lime are embedded into concrete, the expansion accompanying the transformation of CaO into Ca(OH)2 induces stresses and strains in both the lime nodule and in the concrete matrix. The concrete cover thickness, the diameter and the shape of the lime nodule as well as the mechanical characteristics of concrete and lime are the key parameters influencing the development of internal pressure and hence controlling the risk of cracking or pop-out. In order to study the effect of lime into cementitious concretes, laboratory investigations and modelling have been performed and show that the minimum cover thickness necessary to avoid the development of the pop-out phenomenon is estimated of the order of half the diameter of the inclusion. This is coming from the observation that expansion happens inside the porosity of the hydrated lime Ca(OH)2: ESEM and DRX analysis confirm the effect of confinement in the development of crystals. [less ▲]

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See detailDe l'obscurité comme censure. Proust, Muhlfeld, Mallarmé
Durand, Pascal ULg

in Lecler, Yvan; Macé, Laurence; Poulouin, Claudine (Eds.) Censure et Critique (17e-21e siècles) (in press)

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See detailInternal encoding style and schizotypy: towards a conceptually-driven account of positive symptoms
Belayachi, Sanaa ULg; Laloyaux, Julien ULg; Laroi, Frank ULg et al

in Journal of Personality Disorders (in press)

Perception results from a combination of actual data and interpretative schemata based on pre-existing knowledge. Thus, ensuing subjective experience depends on the dynamic interplay between data-driven ... [more ▼]

Perception results from a combination of actual data and interpretative schemata based on pre-existing knowledge. Thus, ensuing subjective experience depends on the dynamic interplay between data-driven and conceptually-driven processing. A chronic imbalance between these two sources of stimulus encoding is likely to be maladaptive and could underlie cognitive and behavioral disturbances similar to that observed in schizotypy, especially if the balance is tipped too far towards conceptually-driven processing (i.e., Internal encoding style). This study aimed to examine the relationships between encoding style and various dimensions of schizotypy, by using a questionnaire that evaluates the extent to which pre-existing schemata (versus cues from the outside world) affect encoding processes. Consistent with previous findings, our results revealed that both Cognitive-Perceptual and Disorganization dimensions were related to an internal mode of encoding, suggesting that individuals with these features may be characterized by a disposition to biases at early stages of encoding. [less ▲]

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See detailVocabulaire des musiques latino-américaines
Pirenne, Christophe ULg; Antouñes, G.; Leymarie, I.

Book published by Minerve (in press)

L'immense espace géographique qui va de la Terre de Feu au Sud du Texas et des côtes du Chili aux Petites Antilles fut le théâtre d'une histoire marquée par d’incessants mouvements migratoires qui ... [more ▼]

L'immense espace géographique qui va de la Terre de Feu au Sud du Texas et des côtes du Chili aux Petites Antilles fut le théâtre d'une histoire marquée par d’incessants mouvements migratoires qui débutèrent au XVIe siècle avec la colonisation. La diversité et l’ampleur de ces flux d'hommes de toutes races, de toutes provenances et de toutes croyances ont été à l'origine de phénomènes d'acculturation complexes et variés. Les musiques indigènes, européennes et africaines ont été réinterprétées, recréées pour aboutir à des formes inédites variant selon les régions ou le degré d’influence de chacune des sources. Ce vocabulaire est destiné à donner un aperçu de cette immense richesse et à éclairer le public francophone sur ces traditions musicales qui, pour certaines, se sont largement diffusées. [less ▲]

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See detailDépister la fragilité, un bénéfice pour le patient et pour le soignant
RICOUR, Céline ULg; DESAINTHUBERT, Marie; GILLAIN, Sophie ULg et al

in Revue Médicale de Liège (in press)

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See detailCarte géologique 34/5, Tongres
Mottequin, Bernard ULg; Marion, Jean-Marc ULg

Cartographic material (in press)

New version of the geological map of the sheet Tongeren-Herderen (no. 107) previously published at the scale of 1/40000 by Van den Broeck (1903)

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See detailCarte géologique 34/6, Herderen
Mottequin, Bernard ULg; Marion, Jean-Marc ULg

Cartographic material (in press)

New version of the geological map of the sheet Tongeren-Herderen (no. 107) previously published at the scale of 1/40000 by Van den Broeck (1903)

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See detailStructuring the lexicon
Polis, Stéphane ULg; Winand, Jean ULg

in Kousoulis, P. (Ed.) Proceedings of the Xth IAE Congress (Rhodos, 2008) (in press)

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See detailCarte géologique de Wallonie (Belgique) 1/10.000. 54/1 Natoye
Marion, Jean-Marc ULg; Barchy, Laurent

Cartographic material (in press)

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using previous scientific data produced since the previous editions in 1882-83 (1/20.000, by Dupont ... [more ▼]

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using previous scientific data produced since the previous editions in 1882-83 (1/20.000, by Dupont, Mourlon and Purves) and 1905 (1/40.000, by Mourlon and Dewalque) [less ▲]

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See detail"Divided families, fractured schooling, in Mexico: educational consequences of children exposition to international migration”
Zuniga, Victor; Vivas Romero, Maria ULg

Report (in press)

This cahier aims to identify and analyze the consequences of international migration movements on the school itineraries and aspirations of children who have been exposed to international migration ... [more ▼]

This cahier aims to identify and analyze the consequences of international migration movements on the school itineraries and aspirations of children who have been exposed to international migration between Mexico and the U. S. Some of these children are active actors of migratory flows because they moved from one country to another. Others are not active migrants; however, given the fact that they belong to divided families due to international migration, they are exposed to the impacts of their family members’ decisions. Consequently, two critical components of their migratory experiences will be the focus of our analysis. Firstly, we will analyze their school trajectory and secondly the family dispersion due to their migratory decisions. [less ▲]

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See detailThe VORTEX project: first results and perspectives
Absil, Olivier ULg; Mawet, Dimitri; Delacroix, Christian ULg et al

in Marchetti, Enrico; Close, Laird; Véran, Jean-Pierre (Eds.) Adaptive Optics Systems IV (in press)

Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They feature a very small inner working angle (down to the ... [more ▼]

Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They feature a very small inner working angle (down to the diffraction limit of the telescope), a clear 360 degree discovery space, have demonstrated very high contrast capabilities, are easy to implement on high-contrast imaging instruments, and have already been extensively tested on the sky. Since 2005, we have been designing, developing and testing an implementation of the charge-2 vector vortex phase mask based on concentric sub-wavelength gratings, referred to as the Annular Groove Phase Mask (AGPM). Science-grade mid-infrared AGPMs were produced in 2012 for the first time, using plasma etching on synthetic diamond substrates. They have been validated on a coronagraphic test bench, showing broadband peak rejection up to 500:1 in the L band, which translates into a raw contrast of about 6e-5 at 2λ/D. Three of them have now been installed on world-leading diffraction-limited infrared cameras, namely VLT/NACO, VLT/VISIR and LBT/LMIRCam. During the science verification observations with our L-band AGPM on NACO, we observed the beta Pictoris system and obtained unprecedented sensitivity limits to planetary companions down to the diffraction limit (0.1"). More recently, we obtained new images of the HR 8799 system at L band during the AGPM first light on LMIRCam. After reviewing these first results obtained with mid-infrared AGPMs, we will discuss the short- and mid-term goals of the on-going VORTEX project, which aims to improve the performance of our vortex phase masks for future applications on second-generation high-contrast imager and on future extremely large telescopes (ELTs). In particular, we will briefly describe our current efforts to improve the manufacturing of mid-infrared AGPMs, to push their operation to shorter wavelengths, and to provide deeper starlight extinction by creating new designs for higher topological charge vortices. Within the VORTEX project, we also plan to develop new image processing techniques tailored to coronagraphic images, and to study some pre- and post-coronagraphic concepts adapted to the vortex coronagraph in order to reduce scattered starlight in the final images. [less ▲]

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See detailCarte géologique de Wallonie (Belgique) 1/10.000, 48/8 Clavier
Barchy, Laurent; Marion, Jean-Marc ULg

Cartographic material (in press)

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using previous scientific data produced since the previous edition in 1902 (at 1/40.000, by Lohest, Forir ... [more ▼]

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using previous scientific data produced since the previous edition in 1902 (at 1/40.000, by Lohest, Forir and Mourlon). [less ▲]

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See detailCarte géologique de Wallonie (Belgique) 1/10.000, 59/4 Nassogne
Barchy, Laurent; Dejonghe, Léon; Marion, Jean-Marc ULg

Cartographic material (in press)

New geological map of Wallonia published at the scale of 1/25.000 based on a new field work and using previous scientific data, produced since the previous edition published in 1900 (Stainer)

Detailed reference viewed: 17 (5 ULg)