Roeselare-Oekene : archeologisch onderzoek op vondsten uit het Paleolithicum

Sedert 2009 zijn de V.O.B.o.W. en WAR actief met een archeologische prospectie met ingreep in de bodem op de site Roeselare-Oekene. De vergunning hiervoor werd toegekend door Ruimte & Erfgoed van de Vlaamse Overheid voor de periode 2009-2011. Aanleiding bij dit archeologisch onderzoek van de V.O.B.o.W.-WAR was de vondstmelding van een mammoettand opgediept door F. Demuynck in de kleigroeve Dumoulin-Bricks te Oekene. Enkele leden van V.O.B.o.W.-WAR bezochten kort nadien de vindplaats en de nodige stappen werden gezet om er een wetenschappelijk onderzoek onder leiding van Jozef Goderis op te starten. Deze bijdrage presenteert de eerste preliminaire resultaten over deze activiteiten op site Roeselare-Oekene

Dynamical Exchange Effects in a Two-Dimensional Many-Polaron Gas

We calculate the influence of dynamical exchange effects on the response properties and the static properties of a two-dimensional many-polaron gas. These effects are not manifested in the random-phase approximation which is widely used in the analysis of the many-polaron system. Here they are taken into account by using a dielectric function derived in the time-dependent Hartree-Fock formalism. At weak electron-phonon coupling, we find that dynamical exchange effects lead to substantial corrections to the random-phase approximation results for the ground state energy, the effective mass, and the optical conductivity of the polaron system. Furthermore, we show that the reduction of the spectral weight of the optical absorption spectrum at frequencies above the longitudinal optical phonon frequency, due to many-body effects, is overestimated by the random-phase approximation.Comment: 9 pages, 7 figure

The seleucid bullae from Uruk in the Royal Museums of Art and History, Brussels

status: publishe

Relighting Egyptian rock art : rapid, accurate HD imaging of prehistoric petroglyphs

Within the framework of the project “Tracing Palaeolithic Aurochs: Rock Art Survey in Upper Egypt”, financed by the National Geographic Society, the authors participated in the long standing tradition of Belgian rock art research in Egypt. Under the direction of Dr. Dirk Huyge, extensive stretches of rock formations along wadi’s in the Eastern Desert between Edfu and Kom Ombo were surveyed in October-November 2014 for the presence of more prehistoric rock art sites, similar to the ones already discovered and studied by the Belgian team in this same region at Qurta and el-Hosh (Huyge et al 2007, 2011, 2012; Huyge 2009). This contribution focuses uniquely on a new component introduced to the 2014 mission: the development and testing of HD imaging techniques for rapid and accurate field recording of the sites with petroglyphs. Multi-light reflectance and 3D photogrammetry techniques were tested on their reliability and operability for a survey in the field