ibis paper is a response to Iwasaki and Sitnon 141 which criticizes de Kleer and Brown I~I.We argue that loans of tilt ir (run ions partu ularl~ nun mint, t ausaltts unodt lint, and stab,lzti, 0z lynaut troun the difference of concerns between engineering and economics. Our notion of causality arises from considerzng the interconnecuions of components not equations. When no fet’dhack is present...

Predicting the performance of a tableau reasoner for an OWL ontology is generally hard. It is even harder for users who are not familiar with the details of tableau algorithms. In this paper we present Pellint, a lint tool that reports and potentially repairs modeling constructs that are known to have bad performance characteristics for Pellet. We describe the collection of modeling constructs ...

This paper compares the profitability and cost of production of irrigated Roundup Ready cotton varieties and conventional cotton varieties grown under crop share rental agreements in the Texas High Plains Region for 1998. The Standardized Performance Analysis (SPA) program was used to analyze 25 sub-enterprises for each variety type from six producers selected from the regional SPA database for...

Argyroneta aquatica is a unique air-breathing spider that lives virtually its entire life under freshwater. It creates a dome-shaped web between aquatic plants and fills the diving bell with air carried from the surface. The bell can take up dissolved O(2) from the water, acting as a 'physical gill'. By measuring bell volume and O(2) partial pressure (P(O(2))) with tiny O(2)-sensitive optodes, ...

The water spider Argyroneta aquatica (Clerck) is the only spider that spends its whole life under water. Water spiders keep an air bubble around their body for breathing and build under-water air bells, which they use for shelter and raising offspring, digesting and consuming prey, moulting, depositing eggs and sperm, and copulating. It is unclear whether these bells are an important oxygen res...