Viking Age ring fortresses were some of the largest construction projects in Danish prehistory. In this article we reconstruct amount turf and timber used Borgring fortress estimate resource area needed to supply building materials. Using REVEALS pollen data modelling, quantify regional oak land cover area. The results show that even though was built an open cultural landscape, sufficient for w...

We show that the continuous limit of a wide natural class of the right-invariant discrete Lagrangian systems on the Virasoro group gives the family of integrable PDE’s containing Camassa-Holm, Hunter-Saxton and Korteweg-de Vries equations. This family has been recently derived by Khesin and Misio-lek as Euler equations on the Virasoro algebra for H1 α,βmetrics. Our result demonstrates a univers...

Each summer in Paris, an enormous military parade commemorates Bastille Day, July 14 1789, when commoners stormed the royal fortress and wrested power from the King, formally initiating what later became known as the French Revolution. The parade is led each year by 2 year students from the École Polytechnique, the top engineering school in France. At the key moment on the key day when the enti...

corresponding author Fariborz Estilaee, Department of Psychiatry, Neyshabur University of Medical Sciences, Neyshabur, Iran. Adress:22 Bahman Hospital, Neyshabur,Iran. Tel: 098-9155512181 Email:[email protected] Dandy-Walker syndrome is a congenital brain malformation involving the cerebellum and the fourth ventricle. The key features of this syndrome are mental retardation, cerebellar ataxia,...