Design and fabrication of instrumented composite airfoils for a cryogenic wind tunnel model

Two instrumented horizontal stabilizers and one instrumented vertical stabilizer were designed and fabricated for testing on the Pathfinder 1 (PF-1) Transport Model in the NASA Langley Research Center's National Transonic Facility (NTF). Two different designs were employed: the horizontal stabilizer utilized a metal spar and fiberglass overwrap and the vertical stabilizer was made of all fiberglass. All design requirements were met in terms of design loads, airfoil tolerances, surface finish, orifice hole quality, and proof-of-concept tests. Pressure tubing installation was found to be easier for these concepts as compared to methods used in conventional metallic models. Ease of repair was found to be a principal advantage in that some fabrication problems were overcome by reapplying fiberglass cloth and/or epoxy to damaged areas. Also, fabrication costs were judged to be lower when compared to the more conventional design fabrication costs

Reconciling Emotion and Rational Choice: Negativistic Auto Theft, Consequence Irrelevance, and the Seduction of Destruction

Objectives: We explore negativism in the context of auto theft and examine its broader phenomenological significance for Rational Choice Theory. Methods: Data were drawn from qualitative, in-depth interviews with 35 active auto thieves operating out of a large Midwestern U.S. city. Results: Negativistic offending is malicious, spiteful, and/or destructive conduct whose purpose is typically more hedonic (i.e., short-term gratification) than instrumental (i.e., resource-generating) or normative (i.e., moralistic). It is made possible by the notion of ownership without responsibility: Offenders controlled a vehicle that was not theirs, promoting consequence irrelevance which in turn unleashed reckless conduct. Conclusions: Consequence irrelevance clarifies negativism’s logic and permits linkage between affect-based and rational choice decision-making models