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See detailGraulichite-(Ce), a new arsenate mineral from the Stavelot Massif, Belgium
Hatert, Frédéric ULiege; Pasero, Marco; Fransolet, André-Mathieu ULiege et al

in European Journal of Mineralogy (2003), 15(4, JUL-AUG), 733-739

Graulichite-(Ce), ideally CeFe33+(AsO4)(2)(OH)(6), is a new mineral species from Hourt, Stavelot Massif, Belgium. It occurs in the most altered parts of a Devillian quartzite (Lower to Middle Cambrian ... [more ▼]

Graulichite-(Ce), ideally CeFe33+(AsO4)(2)(OH)(6), is a new mineral species from Hourt, Stavelot Massif, Belgium. It occurs in the most altered parts of a Devillian quartzite (Lower to Middle Cambrian), in close association with arsenopyrite, scorodite, mimetite, pharmacosiderite, and goethite. Graulichite-(Ce) forms 80 to 150 mum spherical aggregates of rhombohedral crystals, 50 to 80 mum length, which show the forms {10 (1) over bar2} and {10 (11) over bar}. The mineral is transparent and exhibits a light-green to brownish colour, with a resinous lustre. It is non-fluorescent and shows an irregular fracture, without any perceptible cleavage. The calculated density is 4.42 g/cm(3). Graulichite-(Ce) is uniaxial negative, with a mean refractive index close to 1.97(1) (lambda=590 nm), pleochroic from light green to yellowish. Electron microprobe analyses gave As2O5 31.20, P2O5 0.03, SO3 0.06, SiO2 0.03, Al2O3 3.09, Fe2O3 30.65, SrO 0.24, PbO 0.07, BaO 3.95, CaO 0.03, La2O3 2.26, Ce2O3 15.73, Nd2O3 2.08, H2O (calc.) 8.37, total 97.79 wt. %. The resulting empirical formula, calculated on the basis of 6 cations, is (Ce0.67Ba0.18La0.10Nd0.09Sr0.02)(Sigma1.06) (Fe2.683+Al0.42)(Sigma3.10)[(As(1.89)S(.001)square(0.10))(Sigma2.00)O-8][(OH)(5.57)(H2O)(0.43)](Sigma6.00). The single-crystal unit-cell parameters are a=7.288(2) and c=16.812(9) Angstrom, space group R (3) over barm. The seven strongest lines in the X-ray powder-diffraction pattern [d(in Angstrom)(I)(hkil)] are: 3.052(100)(11 (2) over bar3), 3.636(40)(11 (2) over bar0), 2.239(35)(10 (1) over bar7), 1.817(35)(22 (4) over bar0), 2.792(30)(0006), 5.906(25)(10 (1) over bar1), 1.968(25)(30 (3) over bar3). Graulichite-(Ce) is the iron analogue of arsenoflorencite-(Ce), and belongs to the crandallite mineral group, with the alunite-type structure. The crystal structure of graulichite-(Ce) has been refined, based on single-crystal X-ray diffraction data, to R=0.048. [less ▲]

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See detailThe Graull of Chester and the Graouli of Metz
Hamélius, Paul ULiege

in Furnivall, Frederick James (Ed.) The Digby Plays, with an Incomplete 'Morality' of Wisdom, who is Christ (Part of One of the Macro Moralities) (1896)

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See detailGrave Soils Analysis by TD-GCxGC-TOFMS
Stefanuto, Pierre-Hugues ULiege; Scotsmans, E. M.J.; Wilson, A. S. et al

Conference (2012, August)

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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 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)

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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)

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See detailGravitational lenses: observations
Surdej, Jean ULiege

in invited talk delivered during the first general meeting of the European Astronomical Society "The impact of space research on astronomy" (1992)

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See detailGravitational lenses: observations, invited talk
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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