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ORBi Open Repository and Bibliography (313.923 recursos)

In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision). This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.

Engineering, computing & technology => Electrical & electronics engineering

Mostrando recursos 1 - 20 de 107

  1. Correction of Electromagnetic Measurements and Active Shaping of Electromagnetic Fields in Complex and Reverberating Environments

    Spirlet, Maxime
    With the growing number of wireless devices and connected objects, the level of electromagnetic noise could reach unprecedented levels, potentially leading to malfunctions. In order to limit this effect, it is important on the one hand to develop systems with enhanced immunity to radiated electromagnetic fields and, on the other hand, to further rationalize the electromagnetic radiation of wireless devices by improving their design. In this dissertation, two axes of research are addressed. The first aims to help prototyping antennas by accelerating and simplifying the measurement of antenna radiation patterns by performing this measurement in non-dedicated environments, i.e. outside fully anechoic...

  2. Validated extraction of refined temporal gait parameters using foot-worn accelerometers in dual task walking condition of older adults

    Boutaayamou, Mohamed; GILLAIN, Sophie; Schwartz, Cédric; Bruls, Olivier; Denoël, Vincent; PETERMANS, Jean; FORTHOMME, Bénédicte; Croisier, Jean-Louis; Verly, Jacques; GARRAUX, Gaëtan
    Peer reviewed

  3. Preliminary investigation of the applicability of Geometric Brownian motion (GBM) to model the evolution with time of the level of drowsiness of narcoleptic subjects

    Kermi, Sofia; Ebrahimbabaie Varnosfaderani, Pouyan; Verly, Jacques
    Peer reviewed

  4. Prediction of level of drowsiness using an adaptive Geometric Brownian motion model, with application to drowsy driving accident prevention

    Ebrahimbabaie Varnosfaderani, Pouyan; Verly, Jacques
    Peer reviewed

  5. Geometric Brownian motion (GBM) random process model appears to be an excellent choice for modeling realizations of PERCLOS signals

    Ebrahimbabaie Varnosfaderani, Pouyan; Verly, Jacques
    Peer reviewed

  6. Influence of the inhomogeneous properties of a superconducting film on the penetration of the magnetic flux

    Burger, Loïc; Avila Osses, Jonathan; Nguyen, Ngoc Duy; Silhanek, Alejandro; Vanderheyden, Benoît
    We consider the penetration of magnetic flux perpendicular to a Nb superconducting film containing edge indentations and/or defects. The presence of such defects and indented edges forces the induced currents to change direction abruptly, which gives rise to discontinuity lines (d-lines). It has been recently shown, by magneto-optical means, that the shape of the d-lines contain information about the size and the shape of the indentations [1]. Moreover, in contrast with what is commonly assumed, thermomagnetic instabilities are not preferentially triggered near the manufactured indentations, but rather along smooth edges [1]. Such phenomena can lead to unexpected quenching of superconducting...

  7. Excellent Potential of Geometric Brownian Motion (GBM) as a Random Process Model for Level of Drowsiness Signals

    Ebrahimbabaie Varnosfaderani, Pouyan; Verly, Jacques
    Peer reviewed

  8. A SC/battery Hybrid Energy Storage System in the Microgrid

    Li, Jianwei; Cornélusse, Bertrand; Vanderbemden, Philippe; Ernst, Damien
    Peer reviewed

  9. Validated assessment of gait sub-phase durations in older adults using an accelerometer-based ambulatory system

    Boutaayamou, Mohamed; GILLAIN, Sophie; Schwartz, Cédric; Denoël, Vincent; Petermans, Jean; Croisier, Jean-Louis; Forthomme, Bénédicte; Verly, Jacques; Bruls, Olivier; Garraux, Gaëtan
    Peer reviewed

  10. Real-time Corrective Control in Active Distribution Networks

    Soleimani Bidgoli, Hamid
    The continuous growth of renewable energy injected into Medium-Voltage (MV) distribution systems is expected to create new operational problem such as over- and under-voltages and/or thermal overloads of equipment. Therefore, the need for real-time corrective control will go increasing, since reinforcing the network to deal with these temporary situations is seldom an economically viable option for the Distribution System Operator (DSO). This requires monitoring the system through an appropriate measurement and communication infrastructure and taking control actions if the system is going to exceed its prescribed operational limits. In this thesis, number of methods and algorithms have been devised, developed and...

  11. Bulk superconducting tube subjected to the stray magnetic field of a solenoid

    Hogan, Kevin; Fagnard, Jean-François; Wera, Laurent; Vanderheyden, Benoît; Vanderbemden, Philippe
    Peer reviewed

  12. A gait cycle partitioning method using a foot-worn accelerometer system

    Boutaayamou, Mohamed; Bruls, Olivier; Denoël, Vincent; Forthomme, Bénédicte; Croisier, Jean-Louis; Verly, Jacques; Garraux, Gaëtan; Schwartz, Cédric
    Peer reviewed

  13. Instrumentation, magnetic and electrical characterization of superconductors

    Vanderbemden, Philippe

  14. Magnetic shielding of open and semi-closed tubes made of bulk superconductors : the role of a cap

    Vanderbemden, Philippe; Wera, Laurent; Hogan, Kevin; Vanderheyden, Benoît; Fagnard, Jean-François; Namburi, D K; Shi, Y H; Cardwell, D A
    Peer reviewed

  15. Model Order Reduction: Application to Electromagnetic Problems

    Paquay, Yannick

  16. Investigation of the shielding properties of a Bi-2212 bulk superconducting tube subjected to an inhomogeneous magnetic field at various temperatures

    Hogan, Kevin; Wera, Laurent; Fagnard, Jean-François; Vanderbemden, Philippe
    Magnetic shielding with bulk superconductors is commonly studied under homogeneous magnetic fields. This configuration simplifies the analysis of the magnetic reaction of the superconductor as the applied magnetic field is known precisely everywhere. In practical applications, however, the magnetic field to be screened is seldom homogeneous. Magnetic shields experience magnetic field gradients and flux lines curvatures that might lead to a deterioration of the shielding properties. In the present work, we investigate experimentally the magnetic shielding properties of a bulk superconducting Bi-2212 tube subjected to an inhomogeneous magnetic field. This study is carried out at various temperatures thanks to a bespoke...

  17. Coupled electromagnetic-fluid modelling of a bulk superconductor cooled by a cryogenic fluid

    Kirsch, Sébastien; Fagnard, Jean-François; Dubois, Charles; Caps, Hervé; Vanderbemden, Philippe; Vanderheyden, Benoît
    The electric and magnetic performance of a superconductor are strongly dependent of its temperature. For that reason, the cooling of the superconductor material is an important matter, especially for bulk superconductors, which favor low heat transfers because of their low thermal conductivity and the large volume to surface ratio. Usually, heat transfers between a bulk superconductor and the cooling fluid is modelled by a simplified law depending on a convective coefficient and the temperature difference between the fluid and the bulk surface. In practice, however, the heat flux depends also on the geometry of the superconductor and its orientation. Its experimental...

  18. Model for the response of superconducting/ferromagnetic structures subjected to crossed fields

    Vanderheyden, Benoît; Fagnard, Jean-François; Hogan, Kevin; Vanderbemden, Philippe
    Bulk (RE)BCO samples can be used as efficient permanent magnets with trapped magnetic flux densities of a few teslas at 77 K. However, their magnetization may decay over time when subjected to time-varying parasitic fields perpendicular to the initial trapped flux density. In this work, we consider hybrid structures made of superconducting pellets and soft ferromagnetic rings or disks and investigate numerically how their magnetization varies under such crossed-field excitations. We consider a finite-element model in the A-V formulation, which is developed for both the full 3D configuration of the system and for a computationally lighter 2D approximation. The models...

  19. Model for the penetration of magnetic flux in Nb superconducting films with lithographically defined indentations and defects due to inhomogeneities

    Vanderheyden, Benoît; Avila Osses, Jonathan; Brisbois, Jérémy; Burger, Loïc; Nguyen, Ngoc Duy; Silhanek, Alejandro
    We consider the penetration of magnetic flux perpendicularly to a Nb superconducting film containing edge indentations and/or defects. The induced currents undergo an abrupt change of direction around the indentations and the defects, giving rise to discontinuity lines (d-lines). It has recently been shown, by means of magneto-optical imaging and numerical models, that the detailed structure of the d-lines generated with lithographically-defined micro-indentations carry information about their size and shape, and vary with temperature [1]. In this talk, we describe the models which can be used to describe the d-lines and discuss the effects of temperature, demagnetization, and flux creep,...

  20. Drilled bulk high-temperature superconductors: enhancing the trapped magnetic flux by filling the holes with a ferromagnetic powder

    Lousberg, Grégory; Fagnard, Jean-François; Ausloos, Marcel; Vanderbemden, Philippe; Vanderheyden, Benoît
    Filling the holes of a drilled bulk high-temperature superconductor (HTS) with a ferromagnetic powder is shown to enhance its trapping properties. We use experimental techniques (Hall probe mapping techniques and magnetization measurements) to characterize the magnetic properties of drilled samples filled with a soft ferromagnetic powder. The analysis is completed by a numerical model based on a 3D finite-element method that involves a conductivity in the form of a power law for the superconducting material, and a constant permeability for the ferromagnetic material. Numerical results confirm the experimental observations, and, in particular, they support the increase of trapped flux after impregnation (max. 40%) that is observed with Hall probe mappings.

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