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Peer Reviewed
See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in American Geophysical Union Fall Meeting, Abstract (2013)

Detailed reference viewed: 9 (3 ULg)
See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Whalen; Osadetz; Richards (Eds.) et al IGCP-580/596, Geophysical and Geochemical techniques: a window on the Paleozoic world, Abstract book (2013)

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Peer Reviewed
See detailThe astronomical calibration of the Givetian (Middle Devonian) timescale (Dinant Synclinorium, Belgium)
De Vleeschouwer, David; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Special Publication - Geological Society of London (2014), 414

Recent advances in radiometric dating result in significant improvements in the geological timescale and provide better insight into the timing of various processes and evolutions within the Earth’s ... [more ▼]

Recent advances in radiometric dating result in significant improvements in the geological timescale and provide better insight into the timing of various processes and evolutions within the Earth’s system. However, no radiometric ages are contained within the Givetian. Consequently, the absolute ages of the Givetian Stage boundaries, as well as the stage’s duration, remain poorly constrained. As an alternative, the analysis of sedimentary cycles allows for the estimation of the duration of this stage. We examined the high-resolution magnetic susceptibility signals of four Givetian outcrops in the Givet area for a possible astronomical imprint, to fully understand the rates of evolutionary and environmental change. All four sections are firmly correlated and wavelet analyses of the magnetic susceptibility signals reveal the imprint of astronomical eccentricity forcing. The highly stable 405 kyr cycles constrain the duration of the Givetian Stage at 4.35+0.45 Myr, which is in good agreement with the International Chronostratigraphic Chart (5.0 Myr). The studied sections also exhibit an imprint of obliquity, suggesting a climatic teleconnection between low and high latitudes. The corresponding microfacies curves demonstrate similar astronomical imprint, and thereby indicate that the observed 10 5year-scale cyclicity is the result of climatic and environmental change [less ▲]

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See detailAstronomical Optics -- D. J. Schroeder
Manfroid, Jean ULg

in Ciel et Terre (1988), 104

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See detailAstronomical photographic atlas
Heck, Andre; Manfroid, Jean ULg

Book published by Desoer (1977)

Not Available

Detailed reference viewed: 8 (2 ULg)
See detailAstronomical Photometry, A Guide
Sterken, Christiaan; Manfroid, Jean ULg

Book (1992)

Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools ... [more ▼]

Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools for the contemporary observer. This development of higher quality and more sensitive equipment makes it very necessary to improve the accuracy of the measurements. This guide helps the astronomer and astronomy student to improve the quality of their photometric measurements and to extract a maximum of information from their observations. The book is based on the authors' observing experience, spending numerious nights behind various instruments at many different observatories. [less ▲]

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Peer Reviewed
See detailAn astronomical survey conducted in Belgium
Nazé, Yaël ULg; Fontaine, Sébastien ULg

in Physics Education (2014), 49

This article presents the results of the first survey conducted in Belgium about the interest and knowledge in astronomy. Two samples were studied, the public at large (667 questionnaires) and students ... [more ▼]

This article presents the results of the first survey conducted in Belgium about the interest and knowledge in astronomy. Two samples were studied, the public at large (667 questionnaires) and students (2589 questionnaires), but the results are generally similar in both samples. We evaluated people’s interest, main information source, and attitudes towards astronomy, as well as their supposed and actual knowledge of the subject. The main conclusion is that, despite a poor self-confidence, people do know the basic astronomical concepts. However, that knowledge is not deeply rooted, as reasoning questions show well-spread misconceptions and/or misunderstandings. [less ▲]

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See detailL'astronomie au quotidien -- G. Leblanc et J. Lomont
Manfroid, Jean ULg

in Ciel et Terre (1989), 105

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See detailL'astronomie au temps de Kepler
Le Paige, Constantin ULg

Speech (1896)

Detailed reference viewed: 6 (1 ULg)
See detailAstronomie CCD -- C. Buyl
Manfroid, Jean ULg

in Ciel et Terre (1990), 106

Detailed reference viewed: 14 (1 ULg)
See detailAstronomie dans le monde
Manfroid, Jean ULg

Article for general public (2011)

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See detailL'astronomie dans le monde - 01
Manfroid, Jean ULg

Article for general public (2013)

Polaris; Trou noir géant; Jet record; Mercure; Makémaké

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See detailL'astronomie dans le monde - 02
Manfroid, Jean ULg

Article for general public (2013)

Transit vénusien; Tau Ceti; Toutatis; Titan; GRAIL; Kepler; Voie Lactée

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See detailL'astronomie dans le monde - 03
Manfroid, Jean ULg

Article for general public (2013)

Transit vénusien; Tau Ceti; Toutatis; Titan; GRAIL; Kepler; Voie Lactée

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See detailL'astronomie dans le monde - 04
Manfroid, Jean ULg

Article for general public (2013)

Rayons cosmiques; Le bolide de Chelyabinsk; L’astéroïde 2012 DA14;Kepler-37b; G0.253+0.016; Geysers galactiques; La distance du Grand Nuage

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See detailL'astronomie dans le monde - 05
Manfroid, Jean ULg

Article for general public (2013)

Mars; ISON; Un troyen d’Uranus; Titan; Europe; Planck révèle un Univers presque parfait; WISE J1049-5319; GRAIL; ALMA; VIPERS; Supernova lointaine; Supernovæ Ia

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See detailL'astronomie dans le monde - 06
Manfroid, Jean ULg

Article for general public (2013)

Une binaire remarquable; Collision de galaxies;La nébuleuse planétaire C1295; ALMA (suite); Couple massif; Astéroïdes lointains; L’eau de Jupiter; Occultation par Pluton; Super-Terres; Première image ... [more ▼]

Une binaire remarquable; Collision de galaxies;La nébuleuse planétaire C1295; ALMA (suite); Couple massif; Astéroïdes lointains; L’eau de Jupiter; Occultation par Pluton; Super-Terres; Première image d’une planète massive autour d’une étoile double; Tempête au pôle de Saturne [less ▲]

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See detailL'astronomie dans le monde - 09
Manfroid, Jean ULg

Article for general public (2013)

Les 15 ans du VLT; Régime hyposodique; Un nouveau type d’étoilesvariables; HD 95086 b; TW Hydrae; Naissance d’une étoile massive; EBL; Flashes radio; Naine brune; Galaxies massives manquantes; Big Bang ... [more ▼]

Les 15 ans du VLT; Régime hyposodique; Un nouveau type d’étoilesvariables; HD 95086 b; TW Hydrae; Naissance d’une étoile massive; EBL; Flashes radio; Naine brune; Galaxies massives manquantes; Big Bang; L’or et les sursauts gamma courts; Cartes UV de galaxies; Collision galactique; Trous noirs; Étoiles naines; Planète bleue; Planètes et étoiles Kepler; Détection d’exoplanètes; Disques et planètes; Toungouska; Chelyabinsk; Itokawa; L’eau de Mars; Traces sur Mars; Océan martien; Cartes de Mars; Vie microbienne sur Mars ?; Impacts martiens; Comètes Lazare; L’astéroïde P/2010 A2; Neptune; Quaoar; NGC 3783 [less ▲]

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See detailL'astronomie dans le monde - 10
Manfroid, Jean ULg

Article for general public (2013)

Alignement des nébuleusesplanétaires; Jumeau solaire; HH46/47; M87; Nébuleuses du Grand Nuage; Champ magnétique galactique; Aux frontières du Système solaire; Supernova; Sgr A*; Le courant magellanique ... [more ▼]

Alignement des nébuleusesplanétaires; Jumeau solaire; HH46/47; M87; Nébuleuses du Grand Nuage; Champ magnétique galactique; Aux frontières du Système solaire; Supernova; Sgr A*; Le courant magellanique; Naines brunes; 4C12.50 [less ▲]

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See detailL'astronomie dans le monde - 12
Manfroid, Jean ULg

Article for general public (2013)

ISON; (3200) Phaéton; Titan, lacs et hydrocarbures;Titan et le Soleil; Jets; z8_GND_5296; La nébuleuse de la Crevette; Planète isolée; Nébuleuse Toby Jug; Le pulsar du Crabe; Le bulbe de la Voie lactée ... [more ▼]

ISON; (3200) Phaéton; Titan, lacs et hydrocarbures;Titan et le Soleil; Jets; z8_GND_5296; La nébuleuse de la Crevette; Planète isolée; Nébuleuse Toby Jug; Le pulsar du Crabe; Le bulbe de la Voie lactée; ALMA au grand complet; APEX, ArTéMiS; Sgr A*; Première détection de l’acétate de méthyle dans l’espace [less ▲]

Detailed reference viewed: 13 (2 ULg)