The tribological properties of two smooth surfaces in the presence of a thin confined film are investigated with a generic model for the interaction between two surfaces and with computer simulations. It is shown that at large normal contact pressures, an ultra thin film automatically leads to static friction between two flat surfaces-even if the surfaces are incommensurate. Commen-surability i...

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This work presents the absorptance of high-temperature superconducting YBa Cu O 2 3 7 d I 1 ( ) YBCO films, deposited on Si substrates, in the far infrared from 15 to 95 cm ( ) ( wav elength from 667 to 105 m m at temperatures of 100, 200, and 300 K i.e., in the ) normal state . Our experiments show a significant difference in the absorptance for radiation incident on the film side as compared ...

This paper studies the structural robustness of evolutionary models of cooperation, i.e. their sensitivity to small structural changes. To do this, we focus on the Prisoner’s Dilemma game and on the set of stochastic strategies that are conditioned on the last action of the player’s opponent. Strategies such as Tit-For-Tat (TFT) and Always-Defect (ALLD) are particular and classical cases within...

Solutions to the twisted Yang-Baxter equation arising from intertwin-ers for cyclic representations of U q (sl n) are described via two coupled the lattice current algebras.

Nanocrystalline cadmium sulfide thin films as antireflection materials for solar cells have been prepared by a new chemical solution deposition route in an aqueous medium at 50 °C. as-deposited thin films were studied using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and optical absorption spectra. X-ray diffraction data indicated the formation of hexagonal na...

The correlators of two-dimensional rational conformal field theories that are obtained in the TFT construction of [ I , II , IV ] are shown to be invariant under the action of the relative modular group and to obey bulk and boundary factorisation constraints. We present results both for conformal field theories defined on oriented surfaces and for theories defined on unoriented surfaces. In the...