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See detailL'imagination scientifique et ses fictions. Recension de Daniel FONDANECHE, La littérature d’imagination scientifique
Stienon, Valérie ULg

in Acta Fabula : Revue des Parutions en Théorie Littéraire (2013), 14(3),

Précis et ambitieux, l’ouvrage de Daniel Fondanèche s’intéresse à l’ensemble foisonnant, disparate et peu considéré de la « littérature d’imagination scientifique », selon la formule autrefois proposée ... [more ▼]

Précis et ambitieux, l’ouvrage de Daniel Fondanèche s’intéresse à l’ensemble foisonnant, disparate et peu considéré de la « littérature d’imagination scientifique », selon la formule autrefois proposée par Jean‑Jacques Bridenne. L’expression désigne des récits qui développent, par figuration, extrapolation ou anticipation, un rapport significatif et explicite avec les idées et les innovations scientifiques, que celles‑ci relèvent de l’astrophysique, de la chimie, des technologies de la communication, des moyens de transport ou des nombreux autres secteurs d’activités utiles au quotidien. Cette littérature, que l’auteur étudie pour la période comprise principalement entre 1845 et 1910, précède et prépare — sans s’assimiler à elle — la science‑fiction dont Hugo Gernsback posera les bases avec les premières revues de « scientifiction ». En spécialiste des paralittératures, D. Fondanèche en retrace les origines, l’émergence et les principales lignes de force, selon une démarche qui met en évidence les sources d’inspiration des auteurs, tout en éclairant la dimension anticipative de la fiction par l’attestation historique des innovations pensées et réalisées. [less ▲]

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See detailImagination, religion et réforme intellectuelle chez Hobbes
Herla, Anne ULg

in Terrel, Jean; Graciannette, Bernard (Eds.) Hobbes et la religion (2012)

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See detailImagine imaging neural activity in crying infants and in their caring parents
Laureys, Steven ULg; Goldman, S.

in Behavioral and Brain Sciences (2004), 27(4), 465

Soltis' paper contains little data on the underlying neural substrate of the discussed signal function of early infant crying-probably because there is amazingly little known about it. We here discuss the ... [more ▼]

Soltis' paper contains little data on the underlying neural substrate of the discussed signal function of early infant crying-probably because there is amazingly little known about it. We here discuss the interest of functional neuroimaging as an objective measurement of brain activity in (1) early infants during crying and (2) parents hearing their offspring cry. [less ▲]

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See detailImaginer l’indicible. A propos de la mise en mouvement des images dans les récits de visions de la Trinité des hagiographes et des mystiques médiévaux (VIIe – XIIe siècles)
Close, Florence ULg

in Bert, Mathilde; Falque, Ingrid; Hagelstein, Maud (Eds.) Images fixes / images en mouvement (2016)

Cet article propose une réflexion sur la manière dont quelques clercs et moines du haut moyen âge et du moyen âge central ont perçu la Trinité divine, dogme fondamental du christianisme, au cours d’une ... [more ▼]

Cet article propose une réflexion sur la manière dont quelques clercs et moines du haut moyen âge et du moyen âge central ont perçu la Trinité divine, dogme fondamental du christianisme, au cours d’une expérience mystique extraordinaire. Plus particulièrement, il pose la question de la représentation mentale des relations unissant les trois personnes divines entre elles. Une attention toute particulière y est portée au rôle attribué, dans le processus de compréhension et d’appréhension de ce mystère, à la traduction picturale de certains détails et mouvements énoncés ou non dans les traités théologiques, la tradition scripturaire ou les textes liturgiques. Cette enquête repose principalement sur la confrontation des récits des visionnaires aux images de la Trinité produites à la même époque. [less ▲]

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See detailImaginer l’indicible. De l’influence mutuelle entre textes et images dans l’œuvre des hagiographes et des mystiques médiévaux (VIIe-XIIe)
Close, Florence ULg

Conference (2011, May 11)

Cette communication consistait en une réflexion sur les tentatives d’imagination de la Trinité divine, dogme fondamental du christianisme. Elle portait plus particulièrement sur la manière dont les clercs ... [more ▼]

Cette communication consistait en une réflexion sur les tentatives d’imagination de la Trinité divine, dogme fondamental du christianisme. Elle portait plus particulièrement sur la manière dont les clercs et les moines du haut moyen âge et du moyen âge central ont perçu, le temps d’une expérience mystique extraordinaire, les relations unissant les trois personnes divines entre elles. L'auteur pose la question du rôle et de l’importance des représentations mentales et de la traduction picturale de certains détails et mouvements – énoncés ou non dans les traités théologiques, la tradition scripturaire ou les textes liturgiques – dans le processus de compréhension et d’appréhension de ce mystère. Elle n'hésite pas à confronter des images perçues par les visionnaires aux images de la Trinité produites à la même époque (Trône de grâce, Trinité du psautier, Trinité triandrique, Trinité tricéphale/trifrons, Paternité, Trinité à deux médaillons). [less ▲]

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See detailImaginer-lire le Capital
Pieron, Julien ULg

in Cahiers d'Etudes Germaniques (2015), 69

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See detailImaginer-lire Le Capital. Approche des Nachrichten aus der ideologischen Antike
Pieron, Julien ULg

Conference (2013, December 13)

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See detailImaginer-lire le Capital. Présentation des Nachrichten aus der ideologischen Antike d'Alexander Kluge
Pieron, Julien ULg

Scientific conference (2014, November 06)

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See detailImaging a cognitive model of apraxia: The neural substrate of gesture-specific cognitive processes
Peigneux, Philippe ULg; Van der Linden, Martial ULg; Garraux, Gaëtan ULg et al

in Human Brain Mapping (2004), 21(3), 119-142

The present study aimed to ascertain the neuroanatomical basis of an influential neuropsychological model for upper limb apraxia [Rothi LJ, et al. The Neuropsychology of Action. 1997. Hove, UK: Psychology ... [more ▼]

The present study aimed to ascertain the neuroanatomical basis of an influential neuropsychological model for upper limb apraxia [Rothi LJ, et al. The Neuropsychology of Action. 1997. Hove, UK: Psychology Press]. Regional cerebral blood flow was measured in healthy volunteers using (H2O)-O-15 PET during performance of four tasks commonly used for testing upper limb apraxia, i.e., pantomime of familiar gestures on verbal command, imitation of familiar gestures, imitation of novel gestures, and an action-semantic task that consisted in matching objects for functional use. We also re-analysed data from a previous PET study in which we investigated the neural basis. of the visual analysis of gestures. First; we found that two sets of discrete brain areas are predominantly engaged in the imitation of familiar and novel gestures, respectively. Segregated brain activation for novel gesture mutation concur with neuropsychological reports to support the hypothesis that knowledge about the organization of the human body mediates the transition from visual perception to motor execution when imitating novel gestures [Goldenberg Neuropsychologia 1995;35.63-72]. Second, conjunction analyses revealed distinctive neural bases for most of the gesture-specific cognitive processes proposed in this cognitive model of upper limb apraxia. However, a functional analysis of brain imaging data suggested that one single memory store may be used for "to be-perceived" and "to-be-produced" gestural representations, departing from Rothi et al.'s proposal. Based on the above considerations, we suggest and discuss a revised model for upper limb apraxia that might best account for both brain imaging findings and neuropsychological dissociations reported in the apraxia literature. (C) 2004 Wiley-Liss, Inc. [less ▲]

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See detailImaging air filled porosity in sea ice cover: Implication for sea ice permeability and gas exchange at the ice-atmosphere interface
Crabeck, O,; Galley, R,; Else, B, et al

Poster (2015, March)

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See detailImaging air volume fraction in sea ice using non-destructive X-ray tomography
Crabeck, O; Galley, R.J.; Delille, Bruno ULg et al

in Cryosphere (The) (2016), 10

Although the presence of a gas phase in sea ice creates the potential for gas exchange with the atmosphere, the distribution of gas bubbles and transport of gases within the sea ice are still poorly ... [more ▼]

Although the presence of a gas phase in sea ice creates the potential for gas exchange with the atmosphere, the distribution of gas bubbles and transport of gases within the sea ice are still poorly understood. Currently no straightforward technique exists to measure the vertical distribution of air volume fraction in sea ice. Here, we present a new fast and non-destructive X-ray computed tomography technique to quantify the air volume fraction and produce separate images of air volume inclusions in sea ice. The technique was performed on relatively thin (4–22 cm) sea ice collected from an experimental ice tank. While most of the internal layers showed air volume fractions <2 %, the ice–air interface (top 2 cm) systematically showed values up to 5 %. We suggest that the air volume fraction is a function of both the bulk ice gas saturation factor and the brine volume fraction. We differentiate micro bubbles (Ø<1 mm), large bubbles (1mm<Ø<5 mm) and macro bubbles (Ø>5 mm). While micro bubbles were the most abundant type of gas bubbles, most of the air porosity observed resulted from the presence of large and macro bubbles. The ice texture (granular and columnar) as well as the permeability state of ice are important factors controlling the air volume fraction. The technique developed is suited for studies related to gas transport and bubble migration. [less ▲]

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See detailImaging and in Situ Particle Observations of Particles Accelerated by Auroral Electric Fields
Mende, S. B.; Carlson, C. W.; Frey, H. U. et al

Conference (2002, May 01)

Images from the IMAGE Wide-band Imaging Camera (WIC) and Spectrographic Imager (SI) channels SI12 and SI13, were compared to in situ data taken by FAST for several cases of substorm onsets and following ... [more ▼]

Images from the IMAGE Wide-band Imaging Camera (WIC) and Spectrographic Imager (SI) channels SI12 and SI13, were compared to in situ data taken by FAST for several cases of substorm onsets and following auroral conditions. FAST spacecraft observations had shown that the high latitude auroral ionosphere has several distinct regions and two of those are associated with intense particle precipitation The upward current region contains converging electric field structures, large-scale density cavities, down-going inverted V electrons and quasi-static potential structures. Another, sometimes distinct, region is characterized by filamentary currents containing Alfvenic electric fields, field aligned counter streaming (superthermal) electrons and ion heating transverse to B with associated large ion outflow. In two of the cases presented the satellite passed through the substorm surge on its duskward flank fairly soon after substorm onset. In these cases the superthermal wave accelerated component was clearly found to be on the polar cap boundary of the surge and could be isolated from inverted V precipitation which occurred in the more equatorward parts of the auroral oval. It is suggested that the wave accelerated precipitation is the signature of intense earthward-directed, Alfvenic Poynting fluxes usually observed at altitudes of 4-6 Re near the lobe/plasma sheet interface. In one of the cases the surge was accompanied by intense ion outflow. In three of the cases presented FAST passed through the substorm aurora at midnight or the dawn side outside of the surge and the wave accelerated electrons were less clearly separated from the inverted V type precipitation and the wave accelerated, electrons were seen to be part of very short lived transient events i.e. bursts. The ions were present equatorward of the surge with no enhancement poleward of their normal auroral oval position. The region of auroral forms, associated with intense Alfven waves propagating from the magnetosphere, are most likely to be produced by rapidly moving field lines through (substorm) dynamic reconfiguration unlike inverted V type electric field structures which may be produced by steady plasma convection. The ability to image the two different types of auroras would allow to map the field lines connected to regions of dynamic field configuration. [less ▲]

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See detailImaging and understanding of iron ore granulation using X-ray mictrotomography
Evrard, Maxime ULg; Contreras, Rafael; Pirard, Eric ULg

Conference (2014, September)

Imaging and understanding of iron ore granulation using X-ray microtomography. Evrard M., Contreras R., Pirard E. Most iron ores cannot be directly fed into blast furnaces because their particle size ... [more ▼]

Imaging and understanding of iron ore granulation using X-ray microtomography. Evrard M., Contreras R., Pirard E. Most iron ores cannot be directly fed into blast furnaces because their particle size distribution will negatively impact the blast furnace permeability and hence the overall efficiency of the ore reduction process. The finest fraction (typ. < 6.3 mm) has to undergo a sintering process, wherein a mixture of iron ore, coke and flux (limestone, olivine,…) is heated, partially molten and transformed into pieces of sintered material with adequate size, porosity and strength characteristics to be fed into the blast furnace. The preparation of an adequate mixture involves a granulation process which is the subject of this study. Sintering and hence granulation of iron ores, is particularly important in Europe where iron ores show a downward trend in quality (finer particles, broader size range, lower grades with higher variability). In addition an increasing fraction of non-sintered material (return fines) is being added to the mix to optimize the resource efficiency while maintaining sinter quality. For most practitioners, microgranules (or micropellets) are considered as being composed of a nucleus (a particle in the range of 1 to 2 mm) surrounded by layers of the finest ore particles (typically the < 250 µm fraction). A series of experiments and 3D imaging tests have been performed in this study to better understand the granulation mechanisms. Microgranules are formed by mixing iron ore with water in a small rotating drum. Several parameters can be tuned during the granulation process: size and proportion of nucleating particles, size and proportion of fines, water addition, rotating speed, total duration,… Simple experiments using a single ore type (dominantly goethitic or hematitic) and water additions have been carried out systematically to better understand the kinetics of granulation. X-ray microtomography and subsequent 3D image analysis is used to identify and quantify the number of nuclei (when present), to measure the porosity and identify layering or cracks in the microgranule. Compared to previous studies on iron ore pellets (Farber et al. 2002; Shatokha et al. 2009; Shatokha et al. 2010), this work focuses on imaging prior to sintering. It also uses higher resolution micro-CT and definitely brings a better insight into granulation as compared to data from 2D imaging of polished blocks: less artefacts in apparent porosity due to sample preparation; good discrimination among components of the granule; clear identification of the nuclei; etc. This work is part of a larger European project (IMSIMI - Improved Sintering Mix) aiming at an optimal use of challenging input materials through carefully monitored preparation phases (mixing, granulation, etc.) and better understanding of their impact on the sintering process. Farber L., Tardos G., Michaels JN.,2002. Use of X-ray tomograzphy to study the porosity and morphology of granules. Powder Technology vol. 132, p 57-63. Shatokha V., Korobeynikov I., Maire E., Adrien J., 2009. Application of 3D X-ray tomography to investigation of structure of sinter mixture granules. Ironmaking and Steelmaking, vol. 36 (6), p 416-420. Shatokha V., Korobeynikov I., Maire E., Gremillard L., Adrien J.,2010. Iron ore sinter porosity characterisation with application of 3D X-ray tomography. Ironmaking and Steelmaking, vol. 37(5), p313-319. [less ▲]

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See detailImaging apolipoprotein AI in vivo
Sriram, Renuka; Lagerstedt, Jens; Petrlova, Jitka et al

in NMR in Biomedicine (2011), 24(7), 916-924

Coronary disease risk increases inversely with high-d. lipoprotein (HDL) level. The measurement of the biodistribution and clearance of HDL in vivo, however, has posed a tech. challenge. This study ... [more ▼]

Coronary disease risk increases inversely with high-d. lipoprotein (HDL) level. The measurement of the biodistribution and clearance of HDL in vivo, however, has posed a tech. challenge. This study presents an approach to the development of a lipoprotein MRI agent by linking gadolinium methanethiosulfonate (Gd[MTS-ADO3A]) to a selective cysteine mutation in position 55 of apo AI, the major protein of HDL. The contrast agent targets both liver and kidney, the sites of HDL catabolism, whereas the std. MRI contrast agent, gadolinium-diethylenetriaminepentaacetic acidbismethylamide (GdDTPA-BMA, gadodiamide), enhances only the kidney image. Using a modified apolipoprotein AI to create an HDL contrast agent provides a new approach to investigate HDL biodistribution, metab. and regulation in vivo. [less ▲]

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See detailImaging artificial salt water infiltration using electrical resistivity tomography constrained by geostatistical data
Hermans, Thomas ULg; Vandenbohede, Alexander; Lebbe, Luc et al

in Journal of Hydrology (2012), 438-439

Electrical resistivity tomography is a well-known technique to monitor fresh-salt water transitions. In such environments, boreholes are often used to validate geophysical results but rarely used to ... [more ▼]

Electrical resistivity tomography is a well-known technique to monitor fresh-salt water transitions. In such environments, boreholes are often used to validate geophysical results but rarely used to constrain the geoelectrical inversion. To estimate the extent of salt water infiltration in the dune area of a Natural Reserve (Westhoek, Belgium), electrical resistivity tomography profiles were carried out together with borehole electromagnetic measurements. The latter were used to calculate a vertical variogram, representative of the study site. Then, a geostatistical constraint, in the form of an a priori model covariance matrix based on the variogram, was imposed as regularization to solve the electrical inverse problem. Inversion results enabled to determine the extension of the salt water plume laterally and at depth, but also to estimate the total dissolved solid content within the plume. These results are in agreement with the hydrogeological data of the site. A comparison with borehole data showed that the inversion results with geostatistical constraints are much more representative of the seawater body (in terms of total dissolved solids, extension and height) than results using standard smoothness-constrained inversion. The field results obtained for the Westhoek site emphasize the need to go beyond standard smoothness-constrained images and to use available borehole data as prior information to constrain the inversion. [less ▲]

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See detailImaging assessment of periaortic inflammation in Erdheim-Chester disease
COUVREUR, Thierry ULg; LIPCSEI, Györgyi; NCHIMI LONGANG, Alain ULg

in Aorta (2013), 1(2), 146-148

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See detailImaging at the diffraction limit with large ground-based telescopes
Huby, Elsa ULg

Scientific conference (2015, June)

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See detailImaging correlation in non-communicating patients
Heine, Lizette ULg; Di Perri, Carol ULg; Soddu, Andrea ULg et al

in Rossetti, A.O; Laureys, Steven (Eds.) Clinical Neurophysiology in Disorders of Consciousness-Brain Function Monitoring in the ICU and beyond (2015)

The diagnosis and medical management of patients with acute or chronic disorders of consciousness (DOC) are challenging. Motor-independent functional neuroimaging technologies are increasingly employed to ... [more ▼]

The diagnosis and medical management of patients with acute or chronic disorders of consciousness (DOC) are challenging. Motor-independent functional neuroimaging technologies are increasingly employed to study covert cognitive processes in the absence of behavioural reports. Studies with functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) performed in this patient population have utilized active, passive and restingstate paradigms. Active paradigms refer to mental imagery tasks that measure wilful modulation of brain signal in specific brain areas, aiming to detect command-following. Passive paradigms are used to measure brain responses to external sensory stimulation (e.g. auditory, somatosensory and visual). Alternatively, in resting-state paradigms, spontaneous brain function is assessed while subjects receive no external stimulation and are instructed to let their mind wander. Independently from each other, these methods have shown differences between healthy controls and patients, as well as among patients with DOC. However, these techniques cannot yet be used in clinical settings before robust information at the single-subject level will be provided: it is expected that multimodal research will improve the single-patient diagnosis, shed light on the prognostic biomarkers, and eventually promote the medical management of patients with consciousness alterations. [less ▲]

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See detailImaging downward granitic magma transport in the Rogaland anorthosite province, SW Norway
Bolle, Olivier ULg; Trindade, Ricardo I.F.; Diot, Hervé et al

Conference (2002)

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See detailImaging downward granitic magma transport in the Rogaland Igneous Complex, SW norway
Bolle, Olivier ULg; Trindade, Ricardo I.F.; Bouchez, Jean-Luc et al

in Terra Nova (2002), 14(2), 87-92

Combining geological mapping and petrological, structural and geophysical (gravity and seismic) data already available for the late Proterozoic Rogaland Igneous Complex of Norway allows the 3D shape of ... [more ▼]

Combining geological mapping and petrological, structural and geophysical (gravity and seismic) data already available for the late Proterozoic Rogaland Igneous Complex of Norway allows the 3D shape of the Bjerkreim-Sokndal layered intrusion to be modelled as a thick cumulate series capped by massive granitic rocks. Using the latter data, along with the spectacular convergent linear flow pattern that covers both the cumulates and the felsic rocks of this chamber, evidence is presented to show that the granitic material was down-dragged through the sinking of its high-density mafic floor into lower density anorthosites and granulitic gneisses. This example illustrates that downward gravity-driven flows of rocks were active, in addition to upward flows, in the building of the early crust up to late-Proterozoic times, helping to explain the geochemical and structural complexities of the old crust. [less ▲]

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