6,533 research outputs found

    Sensitive detection of methane at 3.3 ÎŒm using an integrating sphere and interband cascade laser

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    Detection of methane at 3.3ÎŒm using a DFB Interband Cascade Laser and gold coated integrating sphere is performed. A 10cm diameter sphere with effective path length of 54.5cm was adapted for use as a gas cell. A comparison between this system and one using a 25cm path length single-pass gas cell is made using direct TDLS and methane concentrations between 0 and 1000 ppm. Initial investigations suggest a limit of detection of 1.0ppm for the integrating sphere and 2.2ppm for the single pass gas cell. The system has potential applications in challenging or industrial environments subject to high levels of vibration

    How often does the Unruh-DeWitt detector click beyond four dimensions?

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    We analyse the response of an arbitrarily-accelerated Unruh-DeWitt detector coupled to a massless scalar field in Minkowski spacetimes of dimensions up to six, working within first-order perturbation theory and assuming a smooth switch-on and switch-off. We express the total transition probability as a manifestly finite and regulator-free integral formula. In the sharp switching limit, the transition probability diverges in dimensions greater than three but the transition rate remains finite up to dimension five. In dimension six, the transition rate remains finite in the sharp switching limit for trajectories of constant scalar proper acceleration, including all stationary trajectories, but it diverges for generic trajectories. The divergence of the transition rate in six dimensions suggests that global embedding spacetime (GEMS) methods for investigating detector response in curved spacetime may have limited validity for generic trajectories when the embedding spacetime has dimension higher than five.Comment: 30 pages. v3: presentational improvement. Published versio

    The Illawarra at Work: A Summary of the Major Findings of the Illawarra Regional Workplace Industrial Relations Survey

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    This paper summarises the main results of the Illawarra Regional Workplace Industrial Relations Survey (IRWIRS). The data is unique in that it provides the only comprehensive and statistically reliable source of information about workplace employee relations at the regional level in Australia, and compares regional patterns with national trends. The data collected relates to industrial relations indicators, workplace ownership, market conditions, management organisation and decision- making in the workplace, among other things. The results reveal a positive pattern of employment relations in the Illawarra, distinctive in many respects from national trends.Illawarra Regional Workplace Industrial Relations Survey, workplace employee relations, Australia

    A study of the miscibility of acrylic-based polymer blends

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    The work carried out in this study constitutes an investigation of the miscibility behaviour of a number of acrylic-based polymers with the high performance, fluoropolymer surface coating material Luniflon LF200. The aim was to find ways of improving the miscibility of LF200 with lower cost acrylic type surface coating materials. In order to more fully understand the mixing behaviour of LF200, blends were prepared with acrylic copolymers and a number of other polymeric materials. LF200 was found to be immiscible with a copolymer based on styrene (ST) and methacrylic acid (MAA), irrespective of the ST:MAA ratio. Miscible blends of LF200 were however, prepared with n-butyl acrylate (PBA) and polyethylene glycol (PEG) homopolymers, among others. [Continues.

    Alien Registration- Hodgkinson, Freda M. (South Berwick, York County)

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    https://digitalmaine.com/alien_docs/6393/thumbnail.jp
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