Space shuttle wing leading edge heating environment prediction derived from development flight data

An analytical program is in progress at Rockwell International to revise wing leading edge heating predictions in order to improve correlation with STS-1 to -5 flight radiometer data. This paper discusses the methods that have been used to improve agreement between prediction and flight and summarizes the aerodynamic correlations which, when updated, will be used to analyze future orbiter missions

An investigation of wing buffeting response at subsonic and transonic speeds: Phase 1: F-111A flight data analysis. Volume 1: Summary of technical approach, results and conclusions

The structural response to aerodynamic buffet during moderate to high-g maneuvers at subsonic and transonic speeds was investigated. The investigation is reported in three volumes. This volume presents a summary of the investigation with a complete description of the technical approach, description of the aircraft, its instrumentation, the data reduction procedures, results and conclusion

An investigation of wing buffeting response at subsonic and transonic speeds. Phase 1: F-111A flight data analysis. Volume 2: Plotted power spectra

Volume 2 of this three volume report is presented. This volume presents plotted variations of power spectral density data with frequency for each structural response item for each data sampled and analyzed during the course of the investigation. Some of the information contained in Volume 1 are repeated to allow the reader to identify the specific conditions appropriate to each plot presented and to interpret the data

Treatment Differences and Political Realities in the GAAP-IFRS Debate

The Securities Exchange Commission has introduced a Roadmap that describes a process leading to mandatory use of IFRS by domestic issuers by 2014. The SEC justifies this initiative on the grounds that global standardization yields cost savings and an ultimate gain in comparability, facilitating the search for global opportunities by U.S. investors and making U.S. capital markets more attractive to foreign issuers. This paper enters an objection, noting that the stakes include more than the choice of the framework for standard setting. The accounting treatments themselves are at issue, treatments that for the most part concern domestic reporting firms and domestic users of financial statements. We present a treatment by treatment comparison of GAAP and IFRS and go on to discuss the differences\u27 implications. FASB maintained its independence during its 35 year history in the teeth of opposition from corporate management, which experienced a steady diminution of its zone of financial reporting discretion. A switch to IFRS would allow management to reclaim some of the lost territory. Meanwhile, the interest group alignment that protected FASB, comprised of auditing firms, actors in the financial markets, and the SEC, has disintegrated as U.S. capital market power has waned in the face of international competition. Management is the shift\u27s incidental beneficiary, with possible negative effects for reporting quality in domestic markets

Treatment Differences and Political Realities in the GAAP-IFRS Debate

The Securities Exchange Commission has introduced a Roadmap that describes a process leading to mandatory use of IFRS by domestic issuers by 2014. The SEC justifies this initiative on the grounds that global standardization yields cost savings and an ultimate gain in comparability, facilitating the search for global opportunities by U.S. investors and making U.S. capital markets more attractive to foreign issuers. This paper enters an objection, noting that the stakes include more than the choice of the framework for standard setting. The accounting treatments themselves are at issue, treatments that for the most part concern domestic reporting firms and domestic users of financial statements. We present a treatment by treatment comparison of GAAP and IFRS and go on to discuss the differences\u27 implications. FASB maintained its independence during its 35 year history in the teeth of opposition from corporate management, which experienced a steady diminution of its zone of financial reporting discretion. A switch to IFRS would allow management to reclaim some of the lost territory. Meanwhile, the interest group alignment that protected FASB, comprised of auditing firms, actors in the financial markets, and the SEC, has disintegrated as U.S. capital market power has waned in the face of international competition. Management is the shift\u27s incidental beneficiary, with possible negative effects for reporting quality in domestic markets

An investigation of wing buffeting response at subsonic and transonic speeds. Phase 2: F-111A flight data analysis. Volume 1: Summary of technical approach, results and conclusions

A detailed investigation of the flight buffeting response of the F-111A was performed in two phases. In Phase 1 stochastic analysis techniques were applied to wing and fuselage responses for maneuvers flown at subsonic speeds and wing leading edge sweep of 26 degrees. Power spectra and rms values were obtained. This report gives results of Phase 2 where the analyses were extended to include maneuvers flown at wing leading edge sweep values of 50 and 75.5 degrees at subsonic and supersonic speeds and the responses examined were expanded to include vertical shear, bending moment, and hingeline torque of the left and right horizontal tails. Power spectra, response time histories, variations of rms response with angle of attack and effects of wing sweep and Mach number are presented and discussed. Some Phase 1 results are given for comparison purposes

Strategic Network Formation with Attack and Immunization

Strategic network formation arises where agents receive benefit from connections to other agents, but also incur costs for forming links. We consider a new network formation game that incorporates an adversarial attack, as well as immunization against attack. An agent's benefit is the expected size of her connected component post-attack, and agents may also choose to immunize themselves from attack at some additional cost. Our framework is a stylized model of settings where reachability rather than centrality is the primary concern and vertices vulnerable to attacks may reduce risk via costly measures. In the reachability benefit model without attack or immunization, the set of equilibria is the empty graph and any tree. The introduction of attack and immunization changes the game dramatically; new equilibrium topologies emerge, some more sparse and some more dense than trees. We show that, under a mild assumption on the adversary, every equilibrium network with $n$ agents contains at most $2n-4$ edges for $n\geq 4$. So despite permitting topologies denser than trees, the amount of overbuilding is limited. We also show that attack and immunization don't significantly erode social welfare: every non-trivial equilibrium with respect to several adversaries has welfare at least as that of any equilibrium in the attack-free model. We complement our theory with simulations demonstrating fast convergence of a new bounded rationality dynamic which generalizes linkstable best response but is considerably more powerful in our game. The simulations further elucidate the wide variety of asymmetric equilibria and demonstrate topological consequences of the dynamics e.g. heavy-tailed degree distributions. Finally, we report on a behavioral experiment on our game with over 100 participants, where despite the complexity of the game, the resulting network was surprisingly close to equilibrium.Comment: The short version of this paper appears in the proceedings of WINE-1

Opioid modulation of GABA release in the rat inferior colliculus

Background: The inferior colliculus, which receives almost all ascending and descending auditory signals, plays a crucial role in the processing of auditory information. While the majority of the recorded activities in the inferior colliculus are attributed to GABAergic and glutamatergic signalling, other neurotransmitter systems are expressed in this brain area including opiate peptides and their receptors which may play a modulatory role in neuronal communication.Results: Using a perfusion protocol we demonstrate that morphine can inhibit KCl-induced release of [H-3] GABA from rat inferior colliculus slices. DAMGO ([D-Ala(2), N-Me-Phe(4), Gly(5)ol]-enkephalin) but not DADLE ([D-Ala2, D-Leu5]-enkephalin or U69593 has the same effect as morphine indicating that mu rather than delta or kappa opioid receptors mediate this action. [H-3]GABA release was diminished by 16%, and this was not altered by the protein kinase C inhibitor bisindolylmaleimide I. Immunostaining of inferior colliculus cryosections shows extensive staining for glutamic acid decarboxylase, more limited staining for mu opiate receptors and relatively few neurons co-stained for both proteins.Conclusion: The results suggest that mu-opioid receptor ligands can modify neurotransmitter release in a sub population of GABAergic neurons of the inferior colliculus. This could have important physiological implications in the processing of hearing information and/or other functions attributed to the inferior colliculus such as audiogenic seizures and aversive behaviour