In this paper we analyse a 'friendly fire' incident from the second Gulf War and the controversy which came to envelop it during a coroner's inquest in 2007. Focusing on the cockpit video of the incident that was leaked to the media during that inquest, we examine what the military and civilian investigators were involved in reconstructing: the incident as it unfolded in real time. Our analysis is grounded in a praxeological perspective that draws on and links ethnomethodological studies of work, research into 'normal' accidents, disasters and risks, and recent ethnographies of the military. Based on our analysis, we suggest that the accounts offered after the event by the military and civilian inquiries should be treated less as competing descriptions than different ways of problematizing particular aspects of the military-political 'machineries' the pilots' actions were enmeshed within.
Non-native populations of Pacific oysters Crassostrea gigas (Thunberg 1793) are established around the United Kingdom (UK), with two genetically different stocks originating from separate introductions to the UK and France. In this study, we use a coupled biophysical model to simulate Pacific oyster larval transport, in order to investigate the dispersal of the species from a known population near their northern limit on the west coast of the UK (in the Milford Haven Estuary). The model included a pelagic phase, simulating different swimming behaviours, and a settlement phase based on a hydrospatial substrate map. Following successful settlement elsewhere, subsequent releases simulated potential population spread over successive generations. Our results suggest that, should there be sufficiently warm sea temperatures to allow reproduction, dispersal away from Milford Haven Estuary would most be southeast ward towards the Bristol Channel; but dispersal north and west to Ireland is also possible, depending heavily on pelagic swimming behaviour. Seasonal modifications to circulation were less influential. Our study increases understanding of factors that contribute to oyster population spread, and suggests methods for improved management through numerical predictions.
We present recent modeling work aimed at understanding the influence of structural changes in photoacid generators ͑PAGs͒ on acid generation efficiency, deprotection efficiency, and photoacid diffusion in 193 nm chemically amplified resists. An analytical model for the postexposure bake process is used to study the reaction and diffusion properties of the various acids generated by the PAGs. Fourier transfer infrared spectroscopy is used to monitor the generation of photoacid during exposure. Resist thickness loss after PEB as a function of exposure dose is related to the deprotection extent to extract the reaction rate parameters. The effects of the acid size and boiling point on process latitude, line end shortening, and line edge roughness are presented. Analytical model predictions of process latitude and line end shortening are also presented and compared to experimental data. In this study, the photogenerated acid with the smallest molar volume and highest boiling point temperature gave the best overall lithographic performance.
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