Recent interest by scholars in the ocean and its complex geographies has not been directed much towards the everyday life of those on board fishing vessels and how they sense the nature around them. A large trawler for oceanic fishing is a highly efficient industrial production machine, carrying an array of equipment that mediates the connection between crew and nature. This article presents results from an experimental research project, where one of the authors joined a fishing trip on an Icelandic (...) factory trawler. The resulting rich set of ethnographic material reveals much about the particularities of being at sea. It is argued that the ship can be understood as a series of distinct taskscapes, each of which affords certain relations between human and non-human nature. (shrink)

Experimental results on spectra and wave functions of a ray-splitting microwave billiard are presented. The billiard is formed by a flat rectangular microwave cavity with a quarter-circle insert made of teflon in one of the corners. Using the Gutzwiller trace formula, the contribution of the periodic orbits of the billiard to the density of states are determined. The wave functions, many of them showing scars associated with periodic orbits, are interpreted in terms of the semiclassical Green function.

"We prove that any variety of relation algebras which contains an algebra with infinitely many elements below the identity, or which contains the full group relation algebra on some infinite group (or on arbitrarily large finite groups), must have an undecidable equational theory. Then we construct an embedding of the lattice of all subsets of the natural numbers into the lattice of varieties of relation algebras such that the variety correlated with a set [italic capital]X of natural numbers has a (...) decidable equational theory if and only if [italic capital]X is a decidable (i.e., recursive) set. Finally, we construct an example of an infinite, finitely generated, simple, representable relation algebra that has a decidable equational theory.'' -- Abstract. (shrink)

On the eminence and dignity of parents; in the light of Koran and Hadith (Islamic traditions).