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Physical bounds and sum rules for high-impedance surfaces

High-impedance surfaces are artificial surfaces synthesized from periodic structures. The high impedance is useful as it does not short circuit electric currents and reflects electric fields without phase shift. Here, a sum rule is presented that relates frequency intervals having high impedance with the thickness of the structure. The sum rule is used to derive physical bounds on the bandwidth fo

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'Women in Literature': This paper was presented at a Symposium on 'The Image of Woman in Literature' held in Malmö and Lund, March 8-10, 2002. The Symposium was chaired by Henry Diab and Jalil Haidar.

Contingency, Crisis, Critique

The paper discusses the emergence and constitution of modernity as cultural and mental disposition with regard to notions like contingency, crisis, and critique. It refers to authors like Koselleck, Foucault, Makropoulos, Blumenberg, Musil.