Temperature Dependence of Gluon and Ghost Propagators in Landau-Gauge Yang-Mills Theory below the Phase Transition

The Dyson-Schwinger equations of Landau-gauge Yang-Mills theory for the gluon and ghost propagators are investigated. Numerical results are obtained within a truncation scheme which has proven to be successful at vanishing temperature. For temperatures up to 250 MeV we find only minor quantitative changes in the infrared behaviour of the gluon and ghost propagators. The effective action calculated from these propagators is temperature-independent within the numerical uncertainty.Comment: 9 pages, 14 figures, submitted to EPJ C, typos corrected, reference and 2 minor clarifications added, in v3: one paragraph extended, some references added, version to appear in EPJ

Historische Dachwerke : eine Ausstellung von Modellen mittelalterlicher Dachkonstruktionen aus den Städten Konstanz, Ravensburg, Rottweil und Villingen; [Ausstellung des Instituts für Architekturgeschichte, Universität Stuttgart, Universitätsbibliothek Stuttgart vom 4. Mai bis 15. Juni 2000, Bauernhaus-Museum Wolfegg vom 4. Juli bis 1. November 2000] / hrsg. von Stefan King, Mit e. Beitr. von Burghard Lohrum

22 Modelle historischer Dachwerke, von Studierenden des Instituts für Architekturgeschichte der Universität Stuttgart angefertigt, wurden im Jahr 2000 zu einer Ausstellung zusamemngestellt. Der Ausstellungskatalog enthält zusätzliche eine Einführung zum historischen Holzbau, sowie den Eröffnungsvortag von Burghard Lohrum zur südwestdeutaschen Dachwerksentwicklung vom 13. bis 15. Jh

Review of \u3cem\u3eThe Global Luther: A Theologian for Modern Times\u3c/em\u3e

The article reviews the book The Global Luther: A Theologian for Modern Times edited by Christine Helmer

Coulomb Blockade and Hopping Conduction in Graphene Quantum Dots Array

We show that the low temperature electron transport properties of chemically functionalized graphene can be explained as sequential tunneling of charges through a two dimensional array of graphene quantum dots (GQD). Below 15 K, a total suppression of current due to Coulomb blockade through GQD array was observed. Temperature dependent current-gate voltage characteristics show Coulomb oscillations with energy scales of 6.2-10 meV corresponding to GQD sizes of 5-8 nm while resistance data exhibit an Efros-Shklovskii variable range hopping arising from structural and size induced disorder.Comment: The document will be appeared in Physics Review

Non-hexagonal-ring defects and structures induced by strain in graphene and in functionalized graphene

We perform {\textit ab initio} calculations for the strain-induced formation of non-hexagonal-ring defects in graphene, graphane (planar CH), and graphenol (planar COH). We find that the simplest of such topological defects, the Stone-Wales defect, acts as a seed for strain-induced dissociation and multiplication of topological defects. Through the application of inhomogeneous deformations to graphene, graphane and graphenol with initially small concentrations of pentagonal and heptagonal rings, we obtain several novel stable structures that possess, at the same time, large concentrations of non-hexagonal rings (from fourfold to elevenfold) and small formation energies

Optical frequency synthesis and measurement using fibre-based femtosecond lasers

We report the synthesis and measurement of an ultra-precise and extremely stable optical frequency in the telecommunications window around 1543 nm. Using a fibre-based femtosecond frequency comb we have phase-stabilised a fibre laser at 194 THz to an optical frequency standard at 344 THz, thus transferring the properties of the optical frequency standard to another spectral region. Relative to the optical frequency standard, the synthesised frequency at 194 THz is determined to within 1 mHz and its fractional frequency instability is measured to be less than 2*10^{-15} at 1 s, reaching 5*10^{-18} after 8000 s. We also measured the synthesised frequency against a caesium fountain clock: here the frequency comparison itself contributes less than 4 mHz (2*10^{-17}) to the uncertainty. Our results confirm the suitability of fibre based frequency comb technology for precision measurements and frequency synthesis, and enable long-distance comparison of optical clocks by using optical fibres to transmit the frequency information