Recursos de colección

ORBi Open Repository and Bibliography (296.624 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.

Physical, chemical, mathematical & earth Sciences

Mostrando recursos 1 - 20 de 126

  1. Superparamagnetic colloids in viscous fluids

    Darras, Alexis; Opsomer, Eric; Vandewalle, Nicolas; Lumay, Geoffroy
    Peer reviewed

  2. Self-assembly processes of superparamagnetic colloids in a quasi-two-dimensional system

    Rojas, Nicolas; Darras, Alexis; Lumay, Geoffroy
    Peer reviewed

  3. Multi-mission modeling for space-based exoplanet imagers

    Savransky, Dmitry; Delacroix, Christian; Garrett, Daniel
    In addition to the Wide-Field Infrared Survey Telescope Coronagraphic Imager (WFIRST CGI), which is currently scheduled for launch in the mid 2020s, there is an extensive, ongoing design effort for next-generation, space-based, exoplanet imaging instrumentation. This work involves mission concepts such as the Large UV/ Optical/Infrared Surveyor (LUVOIR), the Habitable Exoplanet Imaging Misson (HabEx), and a starshade rendezvous mission for WFIRST, among others. While each of these efforts includes detailed mission analysis targeted at the specifics of each design, there is also interest in being able to analyze all such concepts in a unified way (to the extent that this...

  4. Starshade orbital maneuver study for WFIRST

    Soto, Gabriel; Sinha, Amlan; Savransky, Dmitry; Delacroix, Christian; Garrett, Daniel
    The Wide Field Infrared Survey Telescope (WFIRST) mission, scheduled for launch in the mid-2020s will perform exoplanet science via both direct imaging and a microlensing survey. An internal coronagraph is planned to perform starlight suppression for exoplanet imaging, but an external starshade could be used to achieve the required high contrasts with potentially higher throughput. This approach would require a separately-launched occulter spacecraft to be positioned at exact distances from the telescope along the line of sight to a target star system. We present a detailed study to quantify the Δv requirements and feasibility of deploying this additional spacecraft as...

  5. ExEP yield modeling tool and validation test results

    Morgan, Rhonda; Turmon, Michael; Delacroix, Christian; Savransky, Dmitry; Garrett, Daniel; Lowrance, Patrick; Liu, Xiang Cate; Nunez, Paul
    EXOSIMS is an open-source simulation tool for parametric modeling of the detection yield and characterization of exoplanets. EXOSIMS has been adopted by the Exoplanet Exploration Programs Standards Definition and Evaluation Team (ExSDET) as a common mechanism for comparison of exoplanet mission concept studies. To ensure trustworthiness of the tool, we developed a validation test plan that leverages the Python-language unit-test framework, utilizes integration tests for selected module interactions, and performs end-to-end crossvalidation with other yield tools. This paper presents the test methods and results, with the physics-based tests such as photometry and integration time calculation treated in detail and the...

  6. Development of an ELT XAO testbed using a self referenced Mach-Zehnder wavefront sensor

    Delacroix, Christian; Loupias, Magali; Langlois, Maud; Tallon, Michel; Thiébaut, Eric
    Extreme adaptive optics (XAO) has severe difficulties meeting the high speed (>1kHz), accuracy and photon efficiency requirements for future extremely large telescopes. An innovative high order adaptive optics system using a self-referenced Mach-Zehnder wavefront sensor (MZWFS) allows counteracting these limitations. In addition to its very high accuracy, this WFS is the most robust alternative to segments gaps and telescope spiders which can result in strong wavefront artifacts. In particular in XAO systems when the size of these gaps in the wavefront measurement is comparable to the sub aperture size, loss in performance can be very high. The MZWFS estimates the...

  7. Détection de l’érosion dans un bassin versant agricole par comparaison d’images multidates acquises par drone

    Lisein, Jonahtan; Pineux, Nathalie; Pierrot-Deseilligny, Marc; Degré, Aurore; Lejeune, Philippe
    Peer reviewed

  8. Détection de l’érosion dans un bassin versant agricole par comparaison d’images multidates acquises par drone

    Lisein, Jonahtan; Pineux, Nathalie; Pierrot-Deseilligny, Marc; Degré, Aurore; Lejeune, Philippe
    Peer reviewed

  9. Microlensing variability in the gravitationally lensed quasar QSO 2237+0305 = the Einstein Cross . I. Spectrophotometric monitoring with the VLT

    Eigenbrod, Alexander; Courbin, Frederic; Sluse, Dominique; Meylan, Georges; Agol, Eric
    Peer reviewed

  10. Cation Distribution Dependent Magnetic Properties in CoCr 2-x Fe x O 4 (x= 0.1 to 0.5): EXAFS, Mӧssbauer and Magnetic Measurements

    Kumar, Durgesh; Banerjee, Alok; Mahmoud, Abdelfattah; Rath, Chandana
    Peer reviewed

  11. Cation Distribution Dependent Magnetic Properties in CoCr 2-x Fe x O 4 (x= 0.1 to 0.5): EXAFS, Mӧssbauer and Magnetic Measurements

    Kumar, Durgesh; Banerjee, Alok; Mahmoud, Abdelfattah; Rath, Chandana
    Peer reviewed

  12. Paires de quasars et mirages gravitationnels : Etudes observationnelles et implications astrophysiques

    Sluse, Dominique
    The present work deals with the gravitational lensing phenomenon through the study of three pairs of quasars with different redshifts separated by a few arcseconds on the sky as well as through the study of a new gravitationnally lensed system that we had the chance to serendipitously discover during our thesis. In the first part, we investigate the possibility of measuring the mass of the foreground quasar using the latter as a potential cosmic lens that deviates the light from the background quasar. For this purpose, we have observed with the Hubble Space Telescope (HST) the known close quasar pairs...

  13. Experimental and theoretical investigation of SrFe12O19 nanopowder for permanent magnet application

    Abraime, Brahim; Ait tamerd, Mohamed; Mahmoud, Abdelfattah; Boschini, Frédéric; Abdelilah, Benyoussef; Hamedoun, Mohammed; Xiao, Yinguo; El Kenz, Abdallah; Mounkachi, Omar
    Peer reviewed

  14. M Dwarf Exoplanet Surface Density Distribution: A Log-Normal Fit from 0.07-400 AU

    Meyer, Michael R.; Amara, Adam; Reggiani, Maddalena; Quanz, Sascha P.
    Peer reviewed

  15. Development of SERS nanosensors for the detection of small bioactive molecules by cellular analysis in complex matrices: Application to dopamine

    Dumont, Elodie; De Bleye, Charlotte; Cailletaud, Johan; Jambo, Hugues; Sacre, Pierre-Yves; Hubert, Philippe; Ziemons, Eric
    This communication reports the different steps undertaken in order to develop a new Surface-Enhanced Raman Scattering (SERS) nanosensor for the quantification of dopamine in the culture medium of PC-12 cells. First, the synthesis of the SERS substrate, gold nanoparticles, and its characterization. Then the development of the method with the help of a design of experiments and the demonstration of the specificity of the method over other structurally related catecholamines. And finally, the implementation of the method on the culture medium of PC-12 cells, on an HEPES buffer having served to wash the cells and on the PC-12 cells.

  16. The Companion Mass Function across the Stellar and Substellar Regime

    Reggiani, Maddalena

  17. Investigation into the Mechanochemical Properties of Single Oligorotaxane Foldamers by AFM

    Sluysmans, Damien

  18. Genuinely entangled symmetric states with no N-partite correlations

    Designolle; Giraud, Olivier; Martin, John
    Peer reviewed

  19. First-principles study of tungsten trioxide:structurale properties and polaron formation

    Hamdi, Hanen
    Résumé L’oxyde de tungstène (WO 3 ) est un composé qui a été énormément étudié du fait de la richesse de ses propriétés physiques et de leurs utilisations pour des applications technologiques. En effet, WO 3 est le matériau électrochromique le plus connu grâce à sa capacité de changer de couleur de manière réversible lorsqu’il est soumis à des ondes électromagnétiques ou bien sous l’application d’un champ électrique. Au niveau industriel, les matériaux électrochromiques, dont WO 3 fait partie, sont utilisés principalement dans la fabrication de fentêres à haut rendement énergétique, de verres intelligents, de rétroviseurs anti-reflets, de toits ouvrants, de batteries ou de cristaux photoniques accordables. Il...

  20. An update on ozone profile trends for the period 2000 to 2016

    Steinbrecht, Wolfgang; Froidevaux, Lucien; Fuller, Ryan; Wang, Ray; Anderson, John; Roth, Chris; Bourassa, Adam; Degenstein, Doug; Damadeo, Robert; Zawodny, Joseph; Frith, Stacey; McPeters, Richard; Bhartia, Pawan; Wild, Jeannette; Long, Craig; Davis, Sean; Rosenlof, Karen; Sofieva, Viktoria; Walker, Kaley; Rahpoe, Nabiz; Rozanov, Alexei; Weber, Mark; Laeng, Alexandra; von Clarmann, Thomas; Stiller, Gabriele; Kramarova, Natalya; Godin-Beekmann, Sophie; Leblanc, Thierry; Querel, Richard; Swart, Daan; Boyd, Ian; Hocke, Klemens; Kämpfer, Niklaus; Maillard Barras, Eliane; Moreira, Lorena; Nedoluha, Gerald; Vigouroux, Corinne; Blumenstock, Thomas; Schneider, Matthias; Garcìa, Omaira; Jones, Nicholas; Mahieu, Emmanuel; Smale, Dan; Kotkamp, Michael; Robinson, John; Petropavlovskikh, Irina; Harris, Neil; Hassler, Birgit; Hubert, Daan; Tummon, Fiona
    Peer reviewed

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.