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See detailGrave-opening, Impiety and Sacrilege in Epitaphs from Asia Minor: Greek or Roman Concepts?
Delli Pizzi, Aurian ULiege

Conference (2012, September 21)

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See detailThe Gravettian sequence in Belgium: new observations from several key sites
Touzé, Olivier ULiege; Flas, Damien ULiege; Noiret, Pierre ULiege

Conference (2018, April 12)

In his founding work published at the end of the 1970s, Marcel Otte defined three typological facies within the Gravettian in Belgium (Otte, 1979). However, because chronological data were extremely ... [more ▼]

In his founding work published at the end of the 1970s, Marcel Otte defined three typological facies within the Gravettian in Belgium (Otte, 1979). However, because chronological data were extremely limited at the time, the question of the potential temporal value of these facies was left open. It was not until the round table in Les Eyzies-de-Tayac in 2004 that the accumulation of stratigraphic observations and radiocarbon dates allowed defining their chronological order and proposing a reconstruction of the Belgian Gravettian sequence (Otte and Noiret, 2007). The three typological facies were then tied together in an evolutionary model based on several particular tool types that appeared within the earliest facies and persisted all the way until the most recent facies. However, this persistence of fossiles directeurs is only visible at cave sites, which are the most Gravettian sites in Belgium. Building on the recently collected data on the open-air settlements of Maisières-Canal and Station de l’Hermitage, as well as on the caves and the Upper Shelter of Goyet, we propose to revise the classical seriation of the Belgian Gravettian. We can distinguish two main phases with more or less well-defined limits: a well-documented early phase that includes two distinct and clearly defined technological traditions is followed by a “recent” phase that is characterized by several typological markers but remains otherwise poorly known. In fact, no reference site is available at present for the “recent” Gravettian in Belgium. Instead, this phase is represented only at cave sites where the artefacts that can attributed to it are very often mixed with other chrono-cultural markers, including those belonging to the traditions of the early phase of the Gravettian. Bibliography OTTE M., 1979. Le Paléolithique supérieur ancien en Belgique. Bruxelles: Musée royaux d'Art et d'Histoire (Monographies d'Archéologie nationales, 5), 684 p. OTTE M., NOIRET P., 2007. Le Gravettien du Nord-ouest de l’Europe. In: Le Gravettien: entités régionales d'une paléoculture européenne, Actes de la Table ronde, Les Eyzies-de-Tayac, juillet 2004 (Paléo, 19), p. 243-255. [less ▲]

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See detailLe Gravettien de Moldavie (30.000-23.000 BP)
Noiret, Pierre ULiege

in Paléo. Revue d'Archéologie préhistorique (2007), 19

In Moldavia, three sequences serve as the basis for the chronological context for Gravettian (and Epigravettian) occupations. Two technological phases have been identified, showing independent development ... [more ▼]

In Moldavia, three sequences serve as the basis for the chronological context for Gravettian (and Epigravettian) occupations. Two technological phases have been identified, showing independent development, homogenous in both technological and typological attributes. The Gravettian is characterized by large retouched blades, followed by shouldered points (29,500-23,000 BP), succeeded by the Early Epigravettian (13,500-11,000 BP). [less ▲]

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See detailLe Gravettien du Nord-ouest de l'Europe
Otte, Marcel ULiege; Noiret, Pierre ULiege

in Paléo. Revue d'Archéologie préhistorique (2007), 19

Around 30 sites have yielded Gravettian assemblages in Belgium. Present fairly early (28,000 BP), the Gravettian appears in trios distinct facies. The earliest includes large pointed blades and tanged ... [more ▼]

Around 30 sites have yielded Gravettian assemblages in Belgium. Present fairly early (28,000 BP), the Gravettian appears in trios distinct facies. The earliest includes large pointed blades and tanged tools; the most recent is marked by microlithic backed elements (truncated elements, microgravettes). These facies likely correspond to regional groups, for which the first can also be found fairly easily in neighbouring regions (England, Wales and northern France). In Rhenania, some 15 sites correspond to two facies (with Font Robert points and with microgravettes), similar but not identical to the Belgian facies. [less ▲]

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See detailGraviers de la Meuse (alluvions modernes et anciennes) en Wallonie
Dassargues, Alain ULiege; Wildemeersch, Samuel ULiege; Rentier, Céline

in Dassargues, Alain; Walraevens, Kristine (Eds.) Watervoerende lagen & grondwater in België - Aquifères & eaux souterraines en Belgique (2014)

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See detailGravimetric exploration applied to the detection of faults in the area of Mol - Turnhout (Belgium)
Dassargues, Alain ULiege; Halleux, Lucien ULiege; Monjoie, Albéric ULiege et al

in Annales de la Société Géologique de Belgique (1989), 112(2), 431-441

A gravimetrical exploration has been realized in the area of Mol and Turnhout (province of Antwerp, Belgium) to localize steep dipping faults in the Paleozoic bed rock and the Meso- to Cenozoic overburden ... [more ▼]

A gravimetrical exploration has been realized in the area of Mol and Turnhout (province of Antwerp, Belgium) to localize steep dipping faults in the Paleozoic bed rock and the Meso- to Cenozoic overburden. With a 600 to 1000m thick overburden consisting of sand and clay, 10m high steps in the bed rock result in significant gravimetrical anomalies. The interpretation is based upon comparison with theoretical anomalies computed for various density contrasts and depths. After the classical corrections, the Bouguer anomaly has been smoothed and horizontal derivatives computed to reduce the effect of shallow heterogeneities and regional gradients. The results confirm the presence of several faults already detected by other methods and enable a more accurate positionning. [less ▲]

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See detailGravitational lens simulator : a didactical experiment
Surdej, Jean ULiege; Pospieszalska-Surdej, Anna ULiege

Learning material (2007)

A large concentration of mass may act as a kind of lens, called a gravitational lens. A simple educational experience makes it possible to simulate such effects, see also (http://www.aeos.ulg.ac.be/GL ... [more ▼]

A large concentration of mass may act as a kind of lens, called a gravitational lens. A simple educational experience makes it possible to simulate such effects, see also (http://www.aeos.ulg.ac.be/GL/didactics.php). [less ▲]

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See detailGravitational lens studies with a LMT
Surdej, Jean ULiege; Claeskens, Jean-François ULiege

in Ferrari, M. (Ed.) Proceedings of the International workshop “Science with Liquid Mirror Telescopes” (1998)

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See detailGravitational lenses
Refsdal, S.; Surdej, Jean ULiege

in Reports on Progress in Physics (1994), 57

According to Einstein's general theory of relativity, a gravitational field bends electromagnetic waves in much the same way as low atmospheric air layers curve the trajectory of a propagating light ray ... [more ▼]

According to Einstein's general theory of relativity, a gravitational field bends electromagnetic waves in much the same way as low atmospheric air layers curve the trajectory of a propagating light ray. Large mass concentrations in the universe can thereby act as a type of lens, a gravitational lens. After briefly reviewing the history of gravitational lensing since the early thoughts of Newton in 1704 until the serendipitous discovery of the first gravitational lens system in 1979, the authors recall the basic principles of atmospheric and gravitational lensing. They then describe a simple optical gravitational lens experiment which has the merit of accounting for all types of image configuration observed among currently known gravitational lens systems. Various types of gravitational lens models are described in detail as well as the resulting image properties of a distant source. An updated list as well as colour illustrations of the best known examples of multiply imaged quasars, radio rings and giant luminous arcs and arclets are presented. Some of these observations are discussed in detail. Finally, the authors show how it is possible to use gravitational lensing as a cosmological and astrophysical tool, the most interesting applications being the determination of the Hubble parameter H[SUB]0[/SUB], the mass of very distant lensing galaxies as well as the distribution of luminous and dark matter in the universe. They also show how to determine the size and structure of distant quasars from observations of micro-lensing effects. [less ▲]

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See detailGravitational Lenses Among Highly Luminous Quasars: Large Optical Surveys
Claeskens, Jean-François ULiege; Jaunsen, A. O.; Surdej, Jean ULiege

in Kochanek, C. S.; Hewitt, Jacqueline N (Eds.) Astrophysical applications of gravitational lensing: proceedings of the 173rd Symposium of the International Astronomical Union (1996)

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See detailGravitational Lenses and Damped Ly-alpha Systems
Smette, A.; Claeskens, Jean-François ULiege; Surdej, Jean ULiege

in Kochanek, C. S.; Hewitt, Jacqueline N (Eds.) Astrophysical applications of gravitational lensing: proceedings of the 173rd Symposium of the International Astronomical Union (1996)

Detailed reference viewed: 10 (1 ULiège)
See detail'Gravitational lenses in the Universe', The proceedings of the 31st Liège International Astrophysical Colloquium
Surdej, Jean ULiege; Fraipont-Caro, D.; Gosset, Eric ULiege et al

Book published by Université de Liège (1993)

Detailed reference viewed: 39 (1 ULiège)
See detailGravitational lenses: observations
Surdej, Jean ULiege

in Proceedings of the First general meeting of the European Astronomical Society "The impact of space research on astronomy" (1992)

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See detailGravitational lensing
Surdej, Jean ULiege; Claeskens, Jean-François ULiege

in Bleeker, J. A.; Geiss, J.; Huber, M. (Eds.) The Century of Space Science, Volume I (2001)

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See detailGravitational Lensing as a Tool: Future Observational Prospects
Surdej, Jean ULiege; Refsdal, S.

in Wamsteker, W.; Longair, Malcol S.; Kondo, Y. (Eds.) Frontiers of Space and Ground-Based Astronomy (1994)

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See detailGravitational lensing as a tool: future observational prospects
Surdej, Jean ULiege

Conference (1993)

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See detailGravitational Lensing by a Wine Glass
Surdej, Jean ULiege

Article for general public (1999)

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See detailGravitational Lensing by Damped LY alpha Absorbers
Smette, A.; Claeskens, Jean-François ULiege; Surdej, Jean ULiege

in Carilli, C. L.; Radford, S. J. E.; Menten, K. M. (Eds.) et al Highly Redshifted Radio Lines, ASP Conf. Series Vol. 156 (1999)

Spiral galaxies are thought to be the main responsible for the damped Ly-alpha (DLA) systems seen in QSO spectra. They can also act as gravitational lenses, affecting quantities derived in DLA surveys ... [more ▼]

Spiral galaxies are thought to be the main responsible for the damped Ly-alpha (DLA) systems seen in QSO spectra. They can also act as gravitational lenses, affecting quantities derived in DLA surveys. Assuming that z > 0 spiral galaxies are similar to local ones, we find that, at z 0.5, the number density of DLA systems may be over-estimated by up to 90% and the HI cosmological density (Omega[SUB]HI[/SUB]) by up to 170% in a survey using bright b[SUB]q[/SUB] = 16, z[SUB]q[/SUB] ga 2 QSOs and in the absence of important extinction by dust. Applying our model to existing surveys, we find that Omega[SUB]HI[/SUB] is significantly over-estimated only in the z < 1.7 ones (by 34%). Furthermore, statistical tests indicate that these surveys are indeed affected by gravitational lensing at a 2.3% confidence level. If luminosity functions for flat-spectrum radio-sources and optically selected QSOs are similar in shape and slopes, similar Gling effects should affect surveys for 21cm absorbers using bright, high-z flat-spectrum radio-sources. [less ▲]

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