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See detailPhotoelectric observations of two unusual asteroids - 1978 CA and 1978 DA
Schuster, H. E.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1979), 37

The two fast-moving asteroids 1978 CA and 1978 DA, discovered in February 1978 with the ESO Schmidt telescope at La Silla (Chile), were observed with a photoelectric photometer attached to the 1-m ESO ... [more ▼]

The two fast-moving asteroids 1978 CA and 1978 DA, discovered in February 1978 with the ESO Schmidt telescope at La Silla (Chile), were observed with a photoelectric photometer attached to the 1-m ESO telescope. The light curve of 1978 CA displays two fairly symmetric maxima and minima with a total amplitude of 0.8 mag in V. The synodic period of rotation found is 3 h 45 m and places 1978 CA as the third fastest rotator among all known solar objects. Concerning the minor planet 1978 DA, light variations covering one full cycle of rotation could not be monitored. Nevertheless, the rotation period exceeds 5 h, and the total amplitude is greater than 0.35 mag. [less ▲]

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See detailPhotoelectric photometry of 22 Kalliope during the 1985 opposition and determination of its pole orientation - The 'magnitude-aspect' relations revisited
Surdej, Jean ULg; Pospieszalska-Surdej, Anna ULg; Michalowski, T. et al

in Astronomy and Astrophysics (1986), 170

Abstract image available at: http://esoads.eso.org/abs/1986A&A...170..167S

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See detailPhotoelectric photometry of Comet Halley from Mt Tamborine observatory
Page, A. A.; Nielsen, G. E.; Jones, K. L. et al

in Vistas in Astronomy (1988), 31

Post-perihelion photoelectric observations of comet Halley carried out during several weeks are reported. The measurements confirm the existence of large-amplitude night-to-night changes.

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See detailPhotoelectric photometry of the peculiar emission-line star GG Carinae
Gosset, Eric ULg; Surdej, Jean ULg; Swings, J.-P.

in Astronomy and Astrophysics. Supplement Series (1984), 55

The first extensive sets of photoelectric observations of the peculiar emission-line star GG Carinae were obtained from 1977 to 1981, in both the standard UBV and Strömgren systems. A Fourier analysis of ... [more ▼]

The first extensive sets of photoelectric observations of the peculiar emission-line star GG Carinae were obtained from 1977 to 1981, in both the standard UBV and Strömgren systems. A Fourier analysis of 767 independent measurements leads to the determination of a period P = 31[SUP]d[/SUP].020 for the light variations. Different physical arguments based on the analysis of the present photoelectric - as well as previous photographic - data clearly indicate, however, that the true period is P = 62[SUP]d[/SUP].039. The resulting composite lightcurve displays two distinct maxima and minima with a total light amplitude Deltam â ¡ 0.5 mag. Additional interesting features are noticed in the mean lightcurve. Although it is not possible to classify GG Carinae among any known type of variable stars, the light variations of this object are similar to those observed for beta Lyrae-type systems. [less ▲]

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See detailPhotoelectric scans of comet Halley.
Sterken, C.; Manfroid, Jean ULg; Hutsemekers, Damien ULg et al

in Diversity and Similarity of Comets (1987, September 01)

The authors compare radial photometric scans of comet Halley obtained in April 1986 at the European Southern Observatory, La Silla, Chile, with theoretical profiles derived from Haser's model.

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See detailA Photoelectron Spectroscopic Investigation of Vinyl Fluoride (C2H3F). The HeI, Threshold and CIS Photoelectron Spectroscopy.
Locht, Robert ULg; Leyh, Bernard ULg; Dehareng, Dominique ULg et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2010), 43(1), 01510215

The threshold photoelectron spectrum (TPES) and the constant ion state (CIS) spectra of the individual ionic states of C2H3F have been recorded using synchrotron radiation. For comparison a well resolved ... [more ▼]

The threshold photoelectron spectrum (TPES) and the constant ion state (CIS) spectra of the individual ionic states of C2H3F have been recorded using synchrotron radiation. For comparison a well resolved HeI photoelectron spectrum (HeI-PES) has also been measured and analyzed in detail. The TPES has been measured between 9.5 eV and 35 eV photon energy. Numerous vibrational structures, reported for the first time, observed in the ground state and the six excited states of the cation are analyzed. Quantum chemical calculations have been performed and provide strong support to the assignments. State selected CIS spectra highlighted the major importance of autoionization for the production of almost all ionized states of C2H3F observed in this work. [less ▲]

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See detailPhotoelectron Spectroscopy of Vinyl Bromide and Intramolecular Dynamics of the ionic B state.
Hoxha, A.; Locht, Robert ULg; Leyh, Bernard ULg et al

in Chemical Physics (2000), 256

In this paper we report the He(I) photoelectron spectrum (PES) and the threshold photoelectron spectrum (TPES) of C2H3Br. The fine structure in the first two ionic states in the He(I) spectrum is assigned ... [more ▼]

In this paper we report the He(I) photoelectron spectrum (PES) and the threshold photoelectron spectrum (TPES) of C2H3Br. The fine structure in the first two ionic states in the He(I) spectrum is assigned to progressions belonging partially to previously unobserved vibrational modes. The TPES has been measured between 9.0 and 25.0 eV, and the photon energy range of 9.8-12.0 eV has been investigated in more detail. Extensive calculations with the GAUSSIAN set of programs have been performed to help in the assignment of the observed features. Furthermore, a conical intersection between the A2A" and the B2A" states was found to take place along the C-Br stretching coordinate. Intramolecular dynamics of the B2A" state, initially prepared in the Franck-Condon region, was probed by the Fourier transform of the spectrum. The B2A" state is almost readily depleted, most probably due to a very effective internal cnversion through the conical intersection. [less ▲]

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See detailPhotoferrotrophy and Fe-cycling in a freshwater column
Llirós, M; Crowe, SA; García-Armisen, T et al

Conference (2013)

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See detailPhotoferrotrophy and Fe-cycling in a freshwater column
Llirós, M; Crowe, SA; García-Armisen, T et al

Poster (2013)

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See detailLa photogrammétrie: un procédé pour mesurer les arbres à troncs irréguliers
Bauwens, Sébastien ULg; Fayolle, Adeline ULg; Nzenga, Alide Kidimbu et al

Conference (2013, April)

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See detailPhotogrammetry for forest inventory
Pierrot Deseilligny, Marc; Lisein, Jonathan ULg

Conference (2013, March 12)

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See detailLa photographie [en Wallonie]
Mélon, Marc-Emmanuel ULg

in Demoulin, Bruno (Ed.) Histoire culturelle de la Wallonie (2012)

A short history of photography in Wallonia

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See detailLa photographie à l’épreuve de la chair : mises en jeu et mises en scène du corps dans la photographie contemporaine
Bawin, Julie ULg

in Bawin, Julie (Ed.) Art actuel et Photographie (2008)

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See detailLa photographie à Liège au XIXe siècle. Une modernité ambivalente
Mélon, Marc-Emmanuel ULg

in Duchesne, Jean-Patrick (Ed.) Vers la modernité. Le XIXe siècle au Pays de Liège (2001)

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See detailLa photographie aérienne en période de sècheresse comme source de renseignements géologiques en Wallonie
Quoilin, H.; Ozer, André ULg; Cornet, Yves ULg et al

in Bulletin de la Société Géographique de Liège (2001), 40(2001-1), 33-40

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See detailLa photographie comme lieu de débat entre la sémiotique greimassienne et la sémiotique peircienne
Dondero, Maria Giulia ULg

in Panier, Louis (Ed.) Congrès international de l'AFS, Sémio 2007, Paris 15-17 novembre 2007 (2009)

Le champ de la photographie a été étudié selon différents axes de pertinence par les différents courants de la discipline sémiotique : la sémiotique de tradition peircienne a analysé l’image ... [more ▼]

Le champ de la photographie a été étudié selon différents axes de pertinence par les différents courants de la discipline sémiotique : la sémiotique de tradition peircienne a analysé l’image photographique du point de vue de la production, et donc sa spécificité par rapport aux autres types d’images (Dubois, 1983) ; au contraire, la sémiotique d’inspiration greimassienne, consacrée à l’étude des niveaux génératifs des discours, a pu analyser avec pertinence des textualités photographiques (Floch, 1986) sans, par conséquent, s’occuper ni des techniques de production, ni de ses statuts sociaux. Ce travail vise à examiner les résultats de ces deux approches méthodologiques et surtout à les comparer avec les recherches sémiotiques actuelles. [less ▲]

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See detailLa photographie de mode, entre transition er classicisme. Le cas Prada
Dondero, Maria Giulia ULg

in Villelongue, Martine; Saroli, Julie (Eds.) Défier le temps, une affaire de mode (2013, November)

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See detailLa photographie diagnostic de la contemporanéité
Dondero, Maria Giulia ULg

in Association Française de Sémiotique (2007)

immigration, Cet article porte sur l’efficacité politique d’une série photographique qui problématise des questions socioculturelles contemporaines telles l’immigration, l’exploitation et l’éthique du ... [more ▼]

immigration, Cet article porte sur l’efficacité politique d’une série photographique qui problématise des questions socioculturelles contemporaines telles l’immigration, l’exploitation et l’éthique du travail. L’image photographique devient une ressource dans les mains des acteurs sociaux et fait fonction de diagnostic des tensions du contemporain. La photographie permet de « reconnaître à travers » (c’est-à-dire « diagnostiquer ») et de formuler des jugements. Le potentiel sémantique du diagnostic engendré par cette série et la force illocutoire des jugements qui y sont inscrits fonctionnent comme une sorte d’« argumentation par images ». L’analyse de cette série photographique, réalisée par le photographe et théoricien Allan Sekula, nous a amené à nous interroger sur la relation entre image, corpus, genres d’afférence et statuts (documentaire et artistique). [less ▲]

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