The plasmon is a well established collective excitation of metals in the visible and near UV, but at much lower frequencies dissipation destroys all trace of the plasmon and typical Drude behavior sets in. We propose a mechanism for depression of the plasma frequency into the far infrared or even GHz band: Periodic structures built of very thin wires dilute the average concentration of electron...

sufficiently large that submarkets are apparent. Eagles (1995a) suggests, using a motive-based methodology for segmentation, that the nature-tourism market contains at least four recognizable niche markets: ecotourism, wilderness use, adventure travel, and car camping. Ecotourism involves travel for the discovery of and learning about wild, natural environments. Wilderness travel involves perso...

OBJECTIVE To describe an outbreak of Plasmodium vivax malaria in Far North Queensland in 2002. DESIGN Epidemiological and entomological investigations; molecular analyses of the infecting parasites. MAIN OUTCOME MEASURES Case characteristics, adult and larval mosquito counts at the outbreak location, haplotyping of parasites in blood samples from different cases determined through sequencin...

We consider algorithms to compute the genus and rational parametric equations, for implicitly defined irreducible rational plane algebraic curves of arbitrary degree. Rational panuneterizations exist for all irreducible algebraic curves of genus O. The genus is compuled by a complete analysis of the singularities of plane algebraic curves, using affine quadratic transformations. The rational pa...