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See detailAn in-line shearography setup based on circular polarization gratings
Blain, Pascal ULiege; Piron, Pierre ULiege; Renotte, Yvon ULiege et al

in Optics & Lasers in Engineering (2013)

The shearing amount defines the resolution of a speckle shearing interferometer and the shearing direction defines the sensitivity direction of the setup. The properties of circular (cycloid) holographic ... [more ▼]

The shearing amount defines the resolution of a speckle shearing interferometer and the shearing direction defines the sensitivity direction of the setup. The properties of circular (cycloid) holographic polarization gratings recorded in liquid crystal polymers can be used to build a new multi-shearing direction and amount shearography setup. The polarization states of the diffracted beams offer an easy way to produce phase shifts and thus to compute the phase contained in the shearograms. The theoretical bases of such a device are highlighted and an original compact and full in-line setup is proposed. First experimental results of delamination detection and flaw detection by shearography are presented. A discussion on the importance of the grating recording and the polarization orientation points out the best working requirements. [less ▲]

Detailed reference viewed: 67 (23 ULiège)
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See detailIn-orbit diagnostics of EIT EUV CCD radiation-induced aging
Defise, Jean-Marc ULiege; Clette, Frédéric; Moses, J. et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (1997)

Detailed reference viewed: 24 (2 ULiège)
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See detailIn-orbit performances of the EIT instrument on board SOHO and intercalibration with the EIT Calroc Sounding Rocket program
Defise, Jean-Marc ULiege; Moses, J~D; Clette, Fr. et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (1998)

Detailed reference viewed: 29 (2 ULiège)
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See detailIn-orbit verification, calibration, and performance of the Heliospheric Imager on the STEREO mission
Eyles, Chris; Davis, Chris; Harrison, Richard et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2007)

The Heliospheric Imager (HI) forms part of the SECCHI suite of instruments aboard the two NASA STEREO spacecraft which were launched successfully from Cape Canaveral AFB on 25 Oct 2006 (26 Oct UTC ... [more ▼]

The Heliospheric Imager (HI) forms part of the SECCHI suite of instruments aboard the two NASA STEREO spacecraft which were launched successfully from Cape Canaveral AFB on 25 Oct 2006 (26 Oct UTC). Following lunar swingby's on 15 Dec and 21 Jan respectively, the two spacecraft were placed in heliocentric orbits at approximately 1 AU - one leading and one lagging the Earth, with each spacecraft separating from the Earth by 22.5° per year. Each HI instrument comprises two wide-angle optical cameras - HI-1 and HI-2 have 20° and 70° fields-of-view which are off-pointed from the Sun direction by 14.0° and 53.7° respectively, with the optical axes pointed towards the ecliptic plane. In this way the cameras will for the first time provide stereographic images of the solar corona, and in particular of Coronal Mass Ejections (CMEs) as they propagate outwards through interplanetary space towards the Earth and beyond. The wide-field coverage of HI enables imaging of solar ejecta from 15 to about 330 solar radii whilst the other SECCHI instruments (2 coronagraphs and an EUV imager) provide coverage from the lower corona out to 15 solar radii. This paper briefly reviews the design and performance requirements for the instrument. The various activation, checkout and calibration activities before and after opening the instrument's protective cover or door (instrument 'first-light') are then described and it is shown that the instrument has met the design requirements, including CCD and camera imaging performance, correction for shutterless operation of the cameras, straylight rejection and thermal requirements. It is demonstrated from observations of a CME event on 24-25 Jan 2007 that the instrument is capable of detecting CMEs at an intensity of 1% of the coronal background. Lessons learnt during the design, development and in-orbit operation of the instrument are discussed. [less ▲]

Detailed reference viewed: 27 (3 ULiège)
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See detailIn-orbit vibration testing of spacecraft structures
Poncelet, Fabien ULiege; Kerschen, Gaëtan ULiege; Golinval, Jean-Claude ULiege

in International Conference on Noise and Vibration Engineering, Leuven, 2008 (2008)

In-orbit modal testing can be an interesting tool for the monitoring of spacecraft structures. In these applications, it is impossible to measure or to control the excitation resulting, for instance, from ... [more ▼]

In-orbit modal testing can be an interesting tool for the monitoring of spacecraft structures. In these applications, it is impossible to measure or to control the excitation resulting, for instance, from an impact with a small asteroid or from the working engines. Consequently the only realistic methodology must be an outputonly modal analysis, also called Operational Modal Analysis (OMA). This paper proposes another way of doing OMA where the post-processing (i.e. the physical modal parameter extraction) is simplified and automated. The methodology uses the Blind Source Separation (BSS) techniques which attempt to recover the source signals only from their observed mixtures. In case of structural dynamic responses, the source signals and the mixing matrix are equivalent to the modal coordinates and the mode matrix, respectively. The paper describes the complete methodology including the post-processing, and its feasibility is demonstrated using a numerical application modeling a truss satellite with the FE method. [less ▲]

Detailed reference viewed: 154 (12 ULiège)
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See detailIn-plane and out-of-plane holographic interferometry with multibeam photorefractive recordings in sillenite photorefractive crystals
Thizy, Cédric ULiege; Georges, Marc ULiege; Scauflaire, V. et al

in Delaye, Ph; Denz, C.; Mager, L. (Eds.) Photorefractive Effects, Materials, and Devices (2003, June)

In this paper we present results of the multiple beams recording in photorefractive crystals for multidirectional measurement of object displacement by holographic interferometry. Taking advantage of the ... [more ▼]

In this paper we present results of the multiple beams recording in photorefractive crystals for multidirectional measurement of object displacement by holographic interferometry. Taking advantage of the possibility to record several holograms in the photorefractive crystal without noticeable cross-talk and loss of signal-to-noise ratio, we demonstrate the applicability of this technique to high resolution metrology and nondestructive testing. A first part of the paper is devoted to metrological certification of the process. On the basis of known "in-plane" and "out-of plane" movements, we certify the measurement deconvolution algorithm and error. A second part will concern the measurement of thermo-mechanical composite material properties (Poisson coefficient, ...) with a compact transportable head using double recording illumination [less ▲]

Detailed reference viewed: 34 (0 ULiège)
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See detailIn-plane anisotropic vortex motion induced by a square array of antidots
Silhanek, Alejandro ULiege; Van Look, L.; Raedts, S. et al

in Physica C: Superconductivity (2004), 404(1-4), 340-344

We report on electro-transport measurements on a Pb thin film with a square array of antidots, for the whole angular range of in-plane current orientations. We demonstrate that the interaction of a moving ... [more ▼]

We report on electro-transport measurements on a Pb thin film with a square array of antidots, for the whole angular range of in-plane current orientations. We demonstrate that the interaction of a moving flux line lattice with a periodic pinning potential, breaks the rotational symmetry and induces a guided vortex motion along the principal symmetry orientations of the pinning array. As a consequence, we found that for orientations different than the symmetry directions, the vortex velocity is not aligned with the Lorentz force. We show that this anisotropic vortex motion is temperature dependent and progressively fades out when approaching the normal state. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 13 (0 ULiège)
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See detailIn-Shoe Foot Force Sensor to Assess Hoof Balance Determined by Radiographic Method in Ponies Trotting on a Treadmill
Caudron, I.; Grulke, Sigrid ULiege; Farnir, Frédéric ULiege et al

in Veterinary Quarterly (1998), 20(4), 131-5

Adaptation of an in-foot shoe force sensor and the gait analysis system 'Fscan' makes it possible to monitor the distribution of the vertical forces under the equine foot in motion. The aim of this study ... [more ▼]

Adaptation of an in-foot shoe force sensor and the gait analysis system 'Fscan' makes it possible to monitor the distribution of the vertical forces under the equine foot in motion. The aim of this study is to investigate the effects of two different trimmings on forces under the foot during the trot. The first one increased the height of the lateral hoof wall and the second one restored the mediolateral balance of the foot. These two trimmings were examined by using a radiographical method that quantifies the interphalangeal articular asymmetries due to asymmetrical bearing. The location of the centre of force of the weight-bearing foot and the distribution of the forces applied to the lateral and medial solar surfaces during a stride were analyzed. After optimal trimming, the centre of force of the weight-bearing foot tended to approach the centre of the palmar figure, perpendicular to the distal interphalangeal joint centre. The sum of the forces recorded under the lateral and medial parts respectively of the foot during one stride tended to balance out after corrective trimming. [less ▲]

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See detailAN IN-SILICO MODEL OF BMP-2 CARRIER DEVICE FOR BONE TISSUE ENGINEERING APPLICATION
Manhas, Varun ULiege; Carlier, Aurelie; Geris, Liesbet ULiege

Poster (2016, November 25)

Detailed reference viewed: 45 (6 ULiège)
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See detailIn-silico models of trabecular bone: a sensitivity analysis perspective
Mengoni, Marlène ULiege; Sikora, Sebastien N.F.; d'Otreppe, Vinciane et al

in Geris, Liesbet; Gomez-Cabrero, David (Eds.) Uncertainty in Biology: a computational modeling approach (2014)

Detailed reference viewed: 109 (10 ULiège)
See detailIn-situ & remote sensing studies of outer planet aurora
Badman, S.V.; Baines, K.H.; Bonfond, Bertrand ULiege et al

Conference (2015)

The combination of in situ and remote sensing measurements of auroral processes has yielded a wealth of information about solar wind-magnetosphere-ionosphere coupling at the giant planets. Results from ... [more ▼]

The combination of in situ and remote sensing measurements of auroral processes has yielded a wealth of information about solar wind-magnetosphere-ionosphere coupling at the giant planets. Results from the 2014 joint HST-Cassini Saturn auroral campaign are highlighted to demonstrate some of the interesting features observed in situ and their auroral counterparts, including: (1) perturbations on tens of minutes timescales in the high latitude ion fluxes, magnetic field, broadband plasma waves, and auroral intensity; (2) corotating auroral intensifications and their correspondence with models of the planetary period oscillations based on magnetic field perturbations; and (3) sub-corotating auroral features and their relationship to ring current enhancements observed in Energetic Neutral Atom (ENA) observations [less ▲]

Detailed reference viewed: 49 (3 ULiège)
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See detailIn-Situ Nitroxide-Mediated Radical Polymerization (Nmp) Processes: Their Understanding and Optimization
Sciannamea, Valérie; Jérôme, Robert ULiege; Detrembleur, Christophe ULiege

in Chemical Reviews (2008), 108(3), 1104-26

Detailed reference viewed: 63 (3 ULiège)
Peer Reviewed
See detailAn in-situ NMR analysis of the formation of P- and SiO2-doped TiO2 xerogels
Bodson, Céline ULiege; Lambert, Stéphanie ULiege; Cattoën, Xavier et al

Poster (2010, July)

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See detailIn-situ polymerization of monoethylenically unsaturated monomers with oligomeric or polymeric secondary amines
Detrembleur, Christophe ULiege; Rüdiger, Claus; Meyer, Rolf-Volker

Patent (2004)

PROBLEM TO BE SOLVED: To provide a process for preparing a (co)oligomer or a (co)polymer. ; SOLUTION: The process for preparing a (co)oligomer or (co)polymer comprises forming a mixture containing a ... [more ▼]

PROBLEM TO BE SOLVED: To provide a process for preparing a (co)oligomer or a (co)polymer. ; SOLUTION: The process for preparing a (co)oligomer or (co)polymer comprises forming a mixture containing a monoethylencally unsaturated monomer of formula (M): HR<SP>1</SP>C=CR<SP>2</SP>R<SP>3</SP>, an oxidizing agent, at least one polymer or oligomer of formula (I), and an optional radical initiator and heating the mixture at 0-220[deg.]C. [less ▲]

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See detailThe in-situ polymerization of monoethylenically unsaturated monomers with oligomeric or polymeric secondary amines
Detrembleur, Christophe ULiege; Rüdiger, Claus; Meyer, Rolf-Volker

Patent (2004)

The present invention relates to a new process for the preparation of well-defined random and block polymers or copolymers using hindered secondary amine-oligomers or polymers.

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See detailIn-situ polymerization of monoethylenically unsaturated monomers with secondary amines
Detrembleur, Christophe ULiege; Gross, Thomas; Meyer, Rolf-Volker

Patent (2004)

PROBLEM TO BE SOLVED: To provide a novel process for producing a homopolymer, a random copolymer, or a block copolymer having a controlled molecular weight, a narrow molecular weight distribution, a high ... [more ▼]

PROBLEM TO BE SOLVED: To provide a novel process for producing a homopolymer, a random copolymer, or a block copolymer having a controlled molecular weight, a narrow molecular weight distribution, a high monomer conversion ratio, and a controlled structure. ; SOLUTION: The polymer having a controlled molecular weight, a narrow polydispersibility, a high monomer conversion ratio, and a controlled structure is produced by polymerizing a vinyl monomer during the formation of a mixture of a hindered secondary amine and an oxidizing agent at a relatively low temperature in a short reaction time. It is unnecessary to add a free radical initiator before polymerization. Further, it is unnecessary to preliminarily react the secondary amine with the oxidizing agent before adding the monomer. [less ▲]

Detailed reference viewed: 16 (2 ULiège)
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See detailIn-situ polymerization of monoethylenically unsaturated monomers with secondary amines
Detrembleur, Christophe ULiege; Gross, Thomas; Meyer, Rolf-Volker

Patent (2004)

A process for the preparation of any of well-defined homopolymers, random and block copolymers is disclosed. The process that entails forming a mixture of monomers, a hindered secondary amine and an ... [more ▼]

A process for the preparation of any of well-defined homopolymers, random and block copolymers is disclosed. The process that entails forming a mixture of monomers, a hindered secondary amine and an oxidizing agent is characterized in the absence of any additional free-radical initiator. [less ▲]

Detailed reference viewed: 15 (2 ULiège)
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See detailIn-situ polymerization of monoethylenically unsaturated monomers with secondary amines
Detrembleur, Christophe ULiege; Gross, Thomas; Meyer, Rolf-Volker

Patent (2004)

A process for the preparation of any of well-defined homopolymers, random and block copolymers is disclosed. The process that entails forming a mixture of monomers, a hindered secondary amine and an ... [more ▼]

A process for the preparation of any of well-defined homopolymers, random and block copolymers is disclosed. The process that entails forming a mixture of monomers, a hindered secondary amine and an oxidizing agent is characterized in the absence of any additional free-radical initiator. [less ▲]

Detailed reference viewed: 7 (2 ULiège)
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See detailIn-situ polymerization of monoethylenically unsaturated monomers with secondary amines
Detrembleur, Christophe ULiege; Gross, Thomas; Meyer, Rolf-Volker

Patent (2004)

The present invention relates to a new process for the preparation of well-defined homopolymers, random and block copolymers using a mixture of a hindered secondary amine and an oxidizing agent, without ... [more ▼]

The present invention relates to a new process for the preparation of well-defined homopolymers, random and block copolymers using a mixture of a hindered secondary amine and an oxidizing agent, without any additional free-radical initiator. [less ▲]

Detailed reference viewed: 13 (2 ULiège)