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See detailOptical design and optical properties of a VUV spectrographic imager for ICON mission
Loicq, Jerôme ULg; Kintziger, Christian ULg; Mazzoli, Alexandra ULg et al

in Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray (2016, June)

In the frame of the ICON (Ionospheric Connection Explorer) mission of NASA led by UC Berkeley, CSL and SSL Berkeley have designed in cooperation a new Far UV spectro-imager. The instrument is based on a ... [more ▼]

In the frame of the ICON (Ionospheric Connection Explorer) mission of NASA led by UC Berkeley, CSL and SSL Berkeley have designed in cooperation a new Far UV spectro-imager. The instrument is based on a Czerny-Turner spectrograph coupled with two back imagers. The whole field of view covers [± 12° vertical, ± 9° horizontal]. The instrument is surmounted by a rotating mirror to adjust the horizontal field of view pointing by ± 30°. To meet the scientific imaging and spectral requirements the instrument has been optimized. The optimization philosophy and related analysis are presented in the present paper. PSF, distortion map and spectral properties are described. A tolerance study and alignment cases were performed to prove the instrument can be built and aligned. Finally straylight and out of band properties are discussed. [less ▲]

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See detailDelivering Bad News to Customers: An Employee Perspective
Delcourt, Cécile ULg; Gremler, Dwayne; Greer, Dominique

Conference (2016, June)

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See detailVUV Optical Ground System Equipment and its application to the ICON FUV flight grating characterization and selection
Blain, Pascal ULg; Desselle, Richard ULg; Domken, Isabelle ULg et al

in Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation (2016, June)

ICON FUV is a two channel spectrographic imager that measures intensity and spatial distribution of oxygen (135.6 nm) and molecular nitrogen (157 nm) of the ionosphere. As those wavelengths are strongly ... [more ▼]

ICON FUV is a two channel spectrographic imager that measures intensity and spatial distribution of oxygen (135.6 nm) and molecular nitrogen (157 nm) of the ionosphere. As those wavelengths are strongly absorbed by the atmosphere, the optical elements of the system have to be tested inside vacuum chambers. Prior to the instrument alignment and calibration, two 3600 gr/mm gratings were characterized. The primary focus is the measurement of the diffraction efficiencies; while the second objective is to select the best grating and to define which is the flight and the spare. A dedicated setup has been developed to assess the grating optical performances under vacuum. A 1 cm diameter collimated beam is generated using an off-axis parabola and a UV source at its focal point. The grating is placed at the center of two rotation stages collinearly aligned. One detector is placed on a rotating arm, deported from its rotation center. A PMT detector records diffracted light intensity with respect to its angular position and its wavelength. Angular incidence on the grating is tuned with the help of the second rotation stage. The grating efficiency homogeneity and scattering properties are measured through a Y-X scan. [less ▲]

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See detailGroupe de dimension de système dynamique, partie 1
Leroy, Julien ULg

Scientific conference (2016, June)

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See detailAlignment and calibration of the ICON-FUV instrument: Development of a vacuum UV facility
Loicq, Jerôme ULg; Blain, Pascal ULg; Kintziger, Christian ULg et al

in Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray (2016, June)

The optical calibration of the ICON-FUV instrument requires designing specific ground support equipment (GSE). The ICON-FUV instrument is a spectrographic imager that operates on two specific wavelengths ... [more ▼]

The optical calibration of the ICON-FUV instrument requires designing specific ground support equipment (GSE). The ICON-FUV instrument is a spectrographic imager that operates on two specific wavelengths in the UV (135.6 nm and 157 nm). All the operations have to be performed under vacuum UV light. The optical setup is based on a VUV monochromator coupled with a collimator that illuminates the FUV entrance slit. The instrument is placed on a manipulator providing fields pointing. Image quality and spectral properties can be then characterized for each field. OGSE, MGSE, optical calibration plan and vacuum alignment of the instrument are described. [less ▲]

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See detailGroupe de dimension de système dynamique, partie 2
Leroy, Julien ULg

Scientific conference (2016, June)

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See detailA review on the use of sensors to monitor cattle jaw movements and behavior when grazing
Andriamandroso, Andriamasinoro ULg; Bindelle, Jérôme ULg; Mercatoris, Benoît ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment (2016), 20

Precision Livestock Farming (PLF) is spreading rapidly in intensive cattle farms. It is based on the monitoring of individuals using different kinds of sensors. Applied to grazing animals, PLF is mainly ... [more ▼]

Precision Livestock Farming (PLF) is spreading rapidly in intensive cattle farms. It is based on the monitoring of individuals using different kinds of sensors. Applied to grazing animals, PLF is mainly based on the recording of three parameters: the location, the posture and the movements of the animal. Until now, several techniques have been used to discriminate grazing and ruminating behaviors with accuracies over 90% on average, when compared to observations, providing valuable tools to improve the management of pasture and grazing animals. However, bites and jaw movements are still overlooked, even though they are of utmost importance to assess the animal grazing strategies for various pasture types and develop future techniques allowing better estimation of their intake. The goal of this review is to explore the possibility of monitoring the individual jaw movements and the differentiation of bites in grazing animals. For this purpose, (1) the mechanisms of forage intake in cattle are explained briefly in order to understand the movements performed by the cow, especially during grazing, (2) the various sensors that have been proposed to monitor jaw movements of ruminants such as mechanical sensors (pressure sensors), acoustic sensors (microphone) and electromyography sensors are compared and (3) finally the relationship between jaw movements, biting behavior and forage intake is discussed. The review clearly demonstrated the abilities of mechanical, acoustic and electromyography sensors to classify the difference types of jaw movements. However, it also indicated a wide range of accuracies and different observation windows required to reach these accuracies when compared to the observed movement. This classification purpose could lead to a better detection of more specific behavior, e.g. bite detection, and their exact location on pasture. [less ▲]

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See detailCustomer Coping With Service Failures Across Cultures: A Multilevel Investigation
Van Vaerenbergh, Yves; De Keyser, Arne; Hazee, Simon ULg et al

Conference (2016, June)

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See detailSharing a Car? Yuck, No! An Investigation of Consumer Contamination in Access-Based Services
Hazee, Simon ULg; Delcourt, Cécile ULg; Van Vaerenbergh, Yves

Conference (2016, June)

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See detailSharing a Car? Yuck, No! An Investigation of Consumer Contamination in Access-Based Services
Hazee, Simon ULg; Delcourt, Cécile ULg; Van Vaerenbergh, Yves

Conference (2016, June)

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See detailIntroduction: Les théories représentationnelles
Dewalque, Arnaud ULg

in Dewalque, Arnaud; Gauvry, Charlotte (Eds.) Conscience et représentation. Introduction aux théories représentationnelles de l'esprit (2016)

This is an introduction to a bundle of key contemporary texts about the articulation of consciousness and intentionality. We present and compare the competing theories that have been recently proposed in ... [more ▼]

This is an introduction to a bundle of key contemporary texts about the articulation of consciousness and intentionality. We present and compare the competing theories that have been recently proposed in the literature: first-order representationalism, higher-order representationalism, self-representationalism, modal intentionalism, and anti-representationalism. [less ▲]

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See detailBrain lateralization involved in visual recognition of conspecifics in coral reef fish at recruitment
Roux, Natacha; Duran, Emilio; Lanyon, Rynae G. et al

in Animal Behaviour (2016), 117

In vertebrates, brain functional asymmetries are widespread and increase brain performance. Some species of fishes are known to have brain asymmetries; however, little information is available on brain ... [more ▼]

In vertebrates, brain functional asymmetries are widespread and increase brain performance. Some species of fishes are known to have brain asymmetries; however, little information is available on brain lateralization in coral reef fishes and the impact this could have during the recruitment phase. In this study, soldierfish, Myripristis pralinia, at the larval and juvenile stage recognized conspecifics through visual cues. Larvae with the ablation of either the right or left telencephalic hemisphere lost the attraction towards conspecific cues. In contrast, juveniles with the ablation of the right (but not left) telencephalic hemisphere still displayed a preference towards conspecific visual cues. These results suggest the left telencephalic hemisphere is responsible for the lateralization process used in the visual recognition of coral reef fish juveniles. The determinism of lateralized perception of conspecifics during fish ontogeny may be a consequence of genetic factors, linked with the metamorphosis processes and/or environmental factors such as predation at recruitment. [less ▲]

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See detailLe contexte social de l’isolement des personnes âgées de 65 ans et plus en Belgique
Maggi, Patrick ULg

in Chronique de la ligue des droits de l'Homme (2016), 174

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See detailAbout the multifractal nature of Cantor's bijection: Bounds for the Hölder exponent at almost every irrational point
Nicolay, Samuel ULg; Simons, Laurent

in Fractals (2016), 24(2), 1650014-1-1650014-9

In this note, we investigate the regularity of Cantor’s one-to-one mapping between the irrational numbers of the unit interval and the irrational numbers of the unit square. In particular, we explore the ... [more ▼]

In this note, we investigate the regularity of Cantor’s one-to-one mapping between the irrational numbers of the unit interval and the irrational numbers of the unit square. In particular, we explore the fractal nature of this map by showing that its Hölder regularity lies between 0.35 and 0.72 almost everywhere (with respect to the Lebesgue measure). [less ▲]

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See detailL’autonomie de la Communauté germanophone et sa représentation au sein des institutions belges
Bouhon, Frédéric ULg

in Welcher Platz für die Deutschsprachige Gemeinschaft im föderalen Belgien? (2016)

Cet article correspond au texte d'un discours prononcé au Sénat, à l'occasion d'un colloque organisé le 12 mars 2015 sur la place de la Communauté germanophone dans l'État fédéral belge. L'exposé décrit l ... [more ▼]

Cet article correspond au texte d'un discours prononcé au Sénat, à l'occasion d'un colloque organisé le 12 mars 2015 sur la place de la Communauté germanophone dans l'État fédéral belge. L'exposé décrit l'ampleur de l'autonomie dont dispose la Communauté germanophone et traite de la représentation des habitants de la région de langue allemande au sein des institutions belges. [less ▲]

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See detailDu Blioul (Laurent): 1454 ou 1455-1542
Regibeau, Julien ULg

in Nouvelle biographie nationale. 13 (2016)

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See detailA TOPSAR Processor based on the Omega-K Algorithm: Evaluation with Sentinel-1 Data
Kirkove, Murielle ULg; Orban, Anne ULg; De Rauw, Dominique ULg et al

in A TOPSAR Processor based on the Omega-K Algorithm: Evaluation with Sentinel-1 Data (2016, June)

This paper presents a processor for the TOPS (Terrain Observation by Progressive Scans) imaging mode. TOPS signals have two characteristics that make the use of Stripmap SAR processors inconvenient, i.e ... [more ▼]

This paper presents a processor for the TOPS (Terrain Observation by Progressive Scans) imaging mode. TOPS signals have two characteristics that make the use of Stripmap SAR processors inconvenient, i.e., azimuth frequency and azimuth time foldings. This paper describes a processor based on the Omega-K (Ω-k) algorithm, combined with pre-processing by frequency unfolding and post-processing by time unfolding. Raw data acquired by Sentinel-1 have been used to assess the quality of image reconstruction [less ▲]

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See detailSingle point incremental forming simulation with adaptive remeshing technique using solid-shell elements
Sena, José; Lequesne, Cedric; Duchene, Laurent ULg et al

in Engineering Computations International Journal for Computer- Aided Engineering and Software (2016), 33(5), 1388-1421

Numerical simulation of the single point incremental forming (SPIF) processes can be very demanding and time consuming due to the constantly changing contact conditions between the tool and the sheet ... [more ▼]

Numerical simulation of the single point incremental forming (SPIF) processes can be very demanding and time consuming due to the constantly changing contact conditions between the tool and the sheet surface, as well as the nonlinear material behaviour combined with non-monotonic strain paths. The purpose of this paper is to propose an adaptive remeshing technique implemented in the in-house implicit finite element code LAGAMINE, to reduce the simulation time. This remeshing technique automatically refines only a portion of the sheet mesh in vicinity of the tool, therefore following the tool motion. As a result, refined meshes are avoided and consequently the total CPU time can be drastically reduced. [less ▲]

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