Lebensweise und Persoenlichkeitsentwicklung von Studenten einige Bedingungen und Faktoren der Persoenlichkeitsentwicklung von Studenten in der UdSSR und in der DDR

Informationszentrum Sozialwissenschaften, Berlin, B 2211- GL-7/92 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Mini Dirac cones in the band structure of a copper intercalated epitaxial graphene superlattice

The electronic band structure of an epitaxial graphene superlattice, generated by intercalating a monolayer of Cu atoms, is directly imaged by angle-resolved photoelectron spectroscopy. The 3.2 nm lateral period of the superlattice is induced by a varying registry between the graphene honeycomb and the Cu atoms as imposed by the heteroepitaxial interface Cu/SiC. The carbon atoms experience a lateral potential across the supercell of an estimated value of about 65 meV. The potential leads to strong energy renormalization in the band structure of the graphene layer and the emergence of mini-Dirac cones. The mini-cones' band velocity is reduced to about half of graphene's Fermi velocity. Notably, the ordering of the interfacial Cu atoms can be reversibly blocked by mild annealing. The superlattice indeed disappears at∼220 °C

Intercultural professional development within a virtual learning community

This article is an evaluation of the journey undertaken by participants on the Continuing Intercultural Professional Development in Europe (CIPDE) project, 2007-2009. The project provided participants with opportunities for online learning in order to facilitate reflection on practice and educational contexts. The contention is that the co-construction of shared meanings lies at the very heart of the process of intercultural learning, creating a shared culture of ideas. The article examines the participants' views on the impact of the project on their own learning. It also provides some insights as to the strengths and limitations of online learning across national boundaries