The Effect of the LISA Response Function on Observations of Monochromatic Sources

The Laser Interferometer Space Antenna (LISA) is expected to provide the largest observational sample of binary systems of faint sub-solar mass compact objects, in particular white-dwarfs, whose radiation is monochromatic over most of the LISA observational window. Current astrophysical estimates suggest that the instrument will be able to resolve about 10000 such systems, with a large fraction of them at frequencies above 3 mHz, where the wavelength of gravitational waves becomes comparable to or shorter than the LISA arm-length. This affects the structure of the so-called LISA transfer function which cannot be treated as constant in this frequency range: it introduces characteristic phase and amplitude modulations that depend on the source location in the sky and the emission frequency. Here we investigate the effect of the LISA transfer function on detection and parameter estimation for monochromatic sources. For signal detection we show that filters constructed by approximating the transfer function as a constant (long wavelength approximation) introduce a negligible loss of signal-to-noise ratio -- the fitting factor always exceeds 0.97 -- for f below 10mHz, therefore in a frequency range where one would actually expect the approximation to fail. For parameter estimation, we conclude that in the range 3mHz to 30mHz the errors associated with parameter measurements differ from about 5% up to a factor of 10 (depending on the actual source parameters and emission frequency) with respect to those computed using the long wavelength approximation.Comment: replacement version with typos correcte

Conceptualising the symbolic product: an arts and cultural marketing imperative

he purpose of this paper is to critique existing understanding of the nature of product within the arts and cultural setting, thereby identifying gaps in knowledge regarding ‘product’ in this context. We then develop a reconceptualisation of the product notion, accounting for its symbolic value to society as a whole. We critically review the relevant literature and generate a conceptual model of the symbolic value inherent to an ‘arts and cultural product’. We then set out an agenda for research in the field, i.e. a framework for interviewing established artists to assess their reactions and affinity to our conceptualisation of symbolic product value. Results from the literature review, and our specialist knowledge of the arts and cultural sector, have resulted in the construction of an arts and culture product model which accounts for its tangible, intangible and symbolic dimensions. Our conceptual model can assist cultural producers (e.g. artists) to engage with marketing. Experience tells us that cultural producers often have little or no training in marketing. Addressing our proposed research agenda (which accounts for specific industry practices and philosophies) will enhance engagement with ideas about the product notion and marketing more generally

Exploring Supply Side Network Interactions in the Visual Art Production Process

This paper presents an analysis of the supply-side of the arts market with a focus on how the actors therein interact as a network in the art production process. Through the adoption of a qualitative semi-structured interview methodology, the paper provides insight into how professional and established visual artists (in conjunction with third-party support) conceptualise, produce and distribute their art works in the art market. Results indicate that the art product and the art production process is reliant on a range of mutually beneficial and reciprocal interactions that serve as bases for value creation in the art market. The paper concludes with a range of research opportunities for both academics and practitioners in the arts marketing context

Visitor motivations in arts and cultural organisations: A regional context

Although research into arts and cultural production and consumption is increasing, there remains a lack of empirical knowledge about visitors’ motivation to visit museums in regional locations. We utilise a visitor survey to assess the motivations for consuming cultural experiences at the Queen Victoria Museum and Art Gallery (QVMAG), a regional museum in Launceston, Tasmania. The results of this study both conformed to and deviated somewhat from extant research across the areas of ‘cultural involvement’ and ‘motivation’, which has important implications for marketing management and strategy development in regional contexts

Recent advancements in monolithic AlGaAs/GaAs solar cells for space applications

High efficiency, two terminal, multijunction AlGaAs/GaAs solar cells were reproducibly made with areas of 0.5 sq cm. The multiple layers in the cells were grown by Organo Metallic Vapor Phase Epitaxy (OMVPE) on GaAs substrates in the n-p configuration. The upper AlGaAs cell has a bandgap of 1.93 eV and is connected in series to the lower GaAs cell (1.4 eV) via a metal interconnect deposited during post-growth processing. A prismatic coverglass is installed on top of the cell to reduce obscuration caused by the gridlines. The best 0.5 sq cm cell has a two terminal efficiency of 23.0 pct. at 1 sun, air mass zero (AM0) and 25 C. To date, over 300 of these cells were grown and processed for a manufacturing demonstration. Yield and efficiency data for this demonstration are presented. As a first step toward the goal of a 30 pct. efficient cell, a mechanical stack of the 0.5 sq cm cells described above, and InGaAsP (0.95 eV) solar cells was made. The best two terminal measurement to date yields an efficiency of 25.2 pct. AM0. This is the highest reported efficiency of any two terminal, 1 sun space solar cell

MCMC Exploration of Supermassive Black Hole Binary Inspirals

The Laser Interferometer Space Antenna will be able to detect the inspiral and merger of Super Massive Black Hole Binaries (SMBHBs) anywhere in the Universe. Standard matched filtering techniques can be used to detect and characterize these systems. Markov Chain Monte Carlo (MCMC) methods are ideally suited to this and other LISA data analysis problems as they are able to efficiently handle models with large dimensions. Here we compare the posterior parameter distributions derived by an MCMC algorithm with the distributions predicted by the Fisher information matrix. We find excellent agreement for the extrinsic parameters, while the Fisher matrix slightly overestimates errors in the intrinsic parameters.Comment: Submitted to CQG as a GWDAW-10 Conference Proceedings, 9 pages, 5 figures, Published Versio

Crossing the Line: Selection and Evolution of Virulence Traits

The evolution of pathogens presents a paradox. Pathogenic species are often absolutely dependent on their host species for their propagation through evolutionary time, yet the pathogenic lifestyle requires that the host be damaged during this dependence. It is clear that pathogenic strategies are successful in evolutionary terms because a diverse array of pathogens exists in nature. Pathogens also evolve using a broad range of molecular mechanisms to acquire and modulate existing virulence traits in order to achieve this success. Detailing the benefit of enhanced selection derived through virulence and understanding the mechanisms through which virulence evolves are important to understanding the natural world and both have implications for human health

Examining the Drinking Motives Questionnaire-Revised Short Form among university students in Australia, New Zealand and Argentina

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