The F-12 series aircraft approach to design for control system reliability

The F-12 series aircraft control system design philosophy is reviewed as it pertains to functional reliability. The basic control system, i.e., cables, mixer, feel system, trim devices, and hydraulic systems are described and discussed. In addition, the implementation of the redundant stability augmentation system in the F-12 aircraft is described. Finally, the functional reliability record that has been achieved is presented

SAGE 3: A visible wavelength limb sounder

A brief description is presented for the SAGE 3 (Stratospheric Aerosol and Gas Experiment 3) instrument that has been selected to fly onboard the National Polar Platform 1 (NPOP 1) for the Earth Observational System (Eos) in 1996. The SAGE 3 instrument will perform earth limb sounding with the solar occultation technique measuring the ultraviolet (UV), the visible, and the near infrared (IR) wavelength solar radiation. The instrument will produce atmospheric data for the vertical distribution of aerosol, ozone, nitrogen dioxide, water vapor, and oxygen. The details of the instrument design, data flow, and processing requirements are discussed

Institutions, Institutional Change, Language, and Searle

This paper endeavours to contribute to the growing institutionalist literature on the conception of the institution. We draw from John Davis’ (2003) analysis of the individual in posing the questions: what differentiates institutions, and how can changing institutions be identified through time and space? Our analysis develops Searle’s (2005) argument that language is the fundamental institution. Searle’s argument is rather functionalist, however, and does not convey the ambiguity of language. Moreover, language and understanding, surely when related to most institutions in real life, delineate and circumscribe a community. A community cannot function without a common language, as Searle argued, but language also constitutes a community’s boundaries, and excludes unsavoury outsiders or alien topics for discussion. This is how institutions both constrain and enable. By drawing upon Luhmann’s (1995) systems analysis and notions of discourse, communication, and text we aim to augment the existing analytical role ascribe

Market and Society: How do they relate, and contribute to welfare?

This paper discusses how markets and society relate to each other. We present and discuss three views: markets as separate, markets as embedded, and markets as impure. One’s stance on the contribution of markets to welfare hinges on the conceptualization of market and other spheres in society. If, for instance, one perceives of the economy (the economic domain) as an all-encompassing sphere or as a sphere totally separate from others, then one would believe markets necessarily contribute to welfare. Markets are presumed to be ubiquitous in mainstream economics; the orthodox view is that of the ‘market as separate’. Indeed, Frank Hahn notably conceded that neoclassical economics does not describe markets, but ‘conjures’ them up. Mainstream conceptions of the market are functionalist – in the appropriate conditions the market is an efficiency conduit, and hence wealth and welfare generating. Creating these appropriate conditions then drives policy, such as the provision of health care, and tends to produce a one size fits all approach. This paper argues that this is an overly restrictive conceptualization of markets, and is an inadequate basis for conceptualizing the potential effects of markets. Conceptualizing the market as impure and embedded must be added. We contribute to this discussion by developing the concepts of ‘boundaries’ separating spheres. Such an approach broadens the notion of welfare and well-being beyond the monetized parameters of economic orthodoxy

SAM-2 ground-truth plan: Correlative measurements for the Stratospheric Aerosol Measurement-2 (SAM 2) sensor on the Nimbus G satellite

The SAM-2 will fly aboard the Nimbus-G satellite for launch in the fall of 1978 and measure stratospheric vertical profiles of aerosol extinction in high latitude bands. The plan gives details of the location and times for the simultaneous satellite/correlative measurements for the nominal launch time, the rationale and choice of the correlative sensors, their characteristics and expected accuracies, and the conversion of their data to extinction profiles. The SAM-2 expected instrument performance and data inversion results are presented. Various atmospheric models representative of polar stratospheric aerosols are used in the SAM-2 and correlative sensor analyses

The power of cross-functional teams in driving total quality

Garrett Canada, a Division of Allied-Signal Aerospace Canada, has been a member of the Canadian aerospace industry for 40 years. Although Garrett Canada has always been a profitable division with a solid market share, the changing and turbulent business environment and globalization of the aerospace industry has created new demands and challenges. The marketplace is demanding faster introduction of new products, as well as shorter leadtimes for repairs and spares. It was recognized that reducing cycle times for new products and for ongoing production would not only satisfy our customers, it would also enhance our business performance through reduced inventories, lower past due, and more responsiveness to change. It was evident that drastic function changes were required if we were to maintain our position as a premier aerospace supplier. The challenge was to convert a stable, somewhat slow-paced work environment with strong functional boundaries into a boundaryless world class team functioning in a total quality environment and focused on customer satisfaction. Complete and uncompromised customer satisfaction has become our driving force, with Total Quality being our engine to continuously improve our processes and increase our speed. The way in which this transition has been brought about is the subject of this presentation

Hydrogeologic assessment of in situ natural attenuation in a controlled field experiment

An experiment to investigate the natural attenuation of three volatile organic compounds, toluene, carbon tetrachloride, and tetrachloroethene (∼1–10 mg L−1) was performed in a 3 m deep, sandy aquifer isolated within a 24 m long, 2 m wide, three-sided sheet pile alleyway (hereafter referred to as the gate). A constant flow was maintained in the test volume by pumping a well at the closed end of the gate at 130 mL min−1. The test compounds were introduced to the aquifer using diffusive emitters installed inside 25 cm diameter wells located at the open end of the gate. Monitoring was performed by sampling along six multilevel fences (consisting of 12 sampling points each) ranging in distance from 1 to 22 m from the source wells. A bromide tracer experiment established that there were no significant hydraulic leaks, nor was there any continuous channeling through the gate. Degradation of the test compounds was assessed by mass balance calculations between fences located 1 and 7 m from the source, and the results were compared with degradation rate estimates from snapshot analyses and the analysis of fluxes. There was reasonably good agreement between rates estimated by these different methods. Toluene degraded with a half-life of 58–62 days, carbon tetrachloride degraded with a half-life of ∼11–13 days, and tetrachloroethene degraded too slowly for a reliable estimate of rate to be made. Transformation products identified in the gate included acetate, possibly from toluene degradation, chloroform, trichloroethene, and cis-1,2, dichloroethene. The latter two compounds only appeared in trace quantities and could not be assessed for continuing degradation. However, chloroform degradation was assessed with the snapshot data and using the flux estimates and was found to degrade with a half-life in the range of 10–34 days. No additional chlorinated methanes were detected in the gate, suggesting that the carbon tetrachloride was completely dechlorinated by natural processes within 10 m of the source wells. This experiment demonstrated that degradation of chlorinated solvents occurs naturally at the Borden site but that the ethenes are more resistant to biodegradation than the methanes. In addition, the flux calculations were found to be the most robust in terms of estimating degradation rates.Financial support for this research was provided by the Advanced Alternative Technology Demonstration Facility, funded by the Department of Defense and administered by Rice University. Additional support was provided by the NSERC/Motorolla/ETI Industrial Research Chair in Groundwater Remediation and the Solvents in Groundwater Consortium, University of Waterloo. T. Anderson of the University of Massachusetts assisted with hydrogen measurements, while Susan Froud and Dennis Katic assisted with all other aspects of the fieldwork and participated in discussions of the data. Mike Brown is acknowledged for his contribution to the installation of the gate, and Stephanie Fiorenza is acknowledged for her comments and assistance liaising with AATDF