Michelson Interferometry with the Keck I Telescope

We report the first use of Michelson interferometry on the Keck I telescope for diffraction-limited imaging in the near infrared JHK and L bands. By using an aperture mask located close to the f/25 secondary, the 10 m Keck primary mirror was transformed into a separate-element, multiple aperture interferometer. This has allowed diffraction-limited imaging of a large number of bright astrophysical targets, including the geometrically complex dust envelopes around a number of evolved stars. The successful restoration of these images, with dynamic ranges in excess of 200:1, highlights the significant capabilities of sparse aperture imaging as compared with more conventional filled-pupil speckle imaging for the class of bright targets considered here. In particular the enhancement of the signal-to-noise ratio of the Fourier data, precipitated by the reduction in atmospheric noise, allows high fidelity imaging of complex sources with small numbers of short-exposure images relative to speckle. Multi-epoch measurements confirm the reliability of this imaging technique and our whole dataset provides a powerful demonstration of the capabilities of aperture masking methods when utilized with the current generation of large-aperture telescopes. The relationship between these new results and recent advances in interferometry and adaptive optics is briefly discussed.Comment: Accepted into Publications of the Astronomical Society of the Pacific. To appear in vol. 112. Paper contains 10 pages, 8 figure

Emergence and Evolution of Proprietary ATM Networks in the UK, 1967-2000

Through archival research we investigate the impact of the introduction of Automated Teller Machines (ATM) in British retail banking. Contrary to the experience in the US, in the UK the ATM has been largely neglected by historians and management scholars. Technologically, cash dispensers preceded ATM and were originally a British innovation but U.S. (e.g. IBM and NCR) and German manufacturers (e.g. Siemens) took the lead as the ATM became a global technology. The evolution of the ATM illustrates how banks adopted on-line, real-time computing for the entire branch network and highlights the role of network externalities in financial markets. From a business history perspective, the ATM epitomises a shift in bank strategy, namely how applications of computer technology moved from being potential sources of competitive advantage to being a minimum requirement for effective competition in retail finance. Research in this article traces the origins of this process of competitive change in British retail financial markets, by looking at the emergence of proprietary networks and their evolution into a single national network at the same time that cash dispensers transformed into ATM.

Experimental Trauma Models: An Update

Treatment of polytrauma patients remains a medical as well as socioeconomic challenge. Although diagnostics and therapy improved during the last decades, multiple injuries are still the major cause of fatalities in patients below 45 years of age. Organ dysfunction and organ failure are major complications in patients with major injuries and contribute to mortality during the clinical course. Profound understanding of the systemic pathophysiological response is crucial for innovative therapeutic approaches. Therefore, experimental studies in various animal models are necessary. This review is aimed at providing detailed information of common trauma models in small as well as in large animals

The Lumberjack, September 26, 2012

The student newspaper of Humboldt State Universityhttps://digitalcommons.humboldt.edu/studentnewspaper2012/1012/thumbnail.jp

Factors External to the Individual Encouraging Idea Generation in SME Contexts

This thesis sets out to explore factors external to the individual that encourage creative idea generation in SME environments, understanding their importance in a variety of organisational contexts. The original contribution to knowledge made by this thesis is the creation of a framework which aids understanding by splitting the various factors into those responsible for initiating and sustaining idea generation. Literature concerning creative idea generation is continuously developing and contains a broad spectrum of topics and understandings. Key amongst these are leadership, the nature of creative idea generation, theories such as the ‘strength of weak ties’, collective creativity and the concept of ‘flow’. Fieldwork followed a primarily qualitative, inductive approach, using exploratory surveys, semi-structured interviews and participant observation to develop rich narrative ‘stories’ of idea generation for ten different organisations. Data was analysed in accordance with the principles of grounded theory and resulted in numerous novel findings such as the importance of internal organisational contacts to the development of ideas, the notion that organisational visions can be used to guide idea generation and the effect that physical distance has on the development of interpersonal ties. Leadership also featured heavily within the analysis process with it being found that a combination of transformational and servant qualities best enables idea generation in SME contexts. These and other findings were reflected in the final framework produced by this thesis. From a practical perspective findings from this study arguably have implications for both organisational and leadership development in SME contexts, although overall generalisability is hindered by the chosen sample. Future studies could potentially focus on applying quantitative methodologies to verify the final framework or extend understandings by interlinking organisational factors discussed by this thesis with individual characteristics, mental process and/or experiences that are also known to drive creative idea production