Experiments with Choirs – Practice and Pitfalls

This paper presents work in progress with choirs in their normal rehearsal venues to discover why they do not maintain pitch regularly when singing a cappella music. Following an extensive survey of choral practitioners which gathered evidence of pitch drift in a cappella choral singing, a series of experiments was undertaken with amateur choirs around the United Kingdom. For each choir, data was collected over twenty rehearsals by a member of the choir using equipment supplied by the Open University. The data collected included recordings of a specially composed work, acoustic and environmental measurements, singers' attendance and a summary of each rehearsal by the conductor. In addition, singers were asked to take part in a listening test which measured their ability to discriminate pitch differences between two notes. Preliminary findings shown that pitch drift varies from week to week, and the drift is in the flat direction despite the singers who responded to the survey being able to better discriminate small pitch differences in the flat direction than the sharp

Development of a Survey Instrument to Explore the Characteristics of Australian Private Physiotherapy Practitioners’ Interprofessional Interactions

Background: Interprofessional collaboration is a complex process defined by the relationships and interactions between health practitioners from diverse professional backgrounds. Although the benefits of a collaborative health workforce are widely acknowledged, it is currently poorly understood to what extent private physiotherapy practitioners engage in interprofessional collaboration as a part of their clinical practice, and whether they consider to be adequately trained in this area. Information regarding the frequency, modes of communication, and perceived level of satisfaction associated with private physiotherapy practitioners’ interprofessional interactions is also limited. Purpose: The aim of this paper is to describe the development of a survey instrument that can be used to explore the characteristics of Australian private physiotherapy practitioners’ interprofessional interactions. Methods: A multiphase process was used to develop the survey instrument. The research team conducted a literature search which resulted in the generation of 34 individual survey items. After the initial pool of survey items was developed, three experienced physiotherapists were invited to review the items. The draft survey instrument was then subject to online testing with private physiotherapy practitioners to evaluate the utility of the instrument. Results: All three physiotherapists invited to review the initial pool of survey items provided written feedback to the research team. Following revision, five private physiotherapy practitioners participated in pilot testing the survey instrument. Pilot testing revealed that approximately 10 minutes was required to complete the online survey. Conclusions: The final survey instrument has 29 questions in six sections with categorical, Likert and free text response options and can be used to explore the characteristics of Australian private physiotherapy practitioners’ interprofessional interactions. Information obtained from future research projects utilising this survey may guide the development of effective interventions aimed at enhancing the nature and quality of clinical interactions between private physiotherapy practitioners and other health practitioners working in Australia

Development of a survey instrument to explore the characteristics of Australian private physiotherapy practitioners’ interprofessional interactions

Background: Interprofessional collaboration is a complex process defined by the relationships and interactions between health practitioners from diverse professional backgrounds. Although the benefits of a collaborative health workforce are widely acknowledged, it is currently poorly understood to what extent private physiotherapy practitioners engage in interprofessional collaboration as a part of their clinical practice, and whether they consider to be adequately trained in this area. Information regarding the frequency, modes of communication, and perceived level of satisfaction associated with private physiotherapy practitioners’ interprofessional interactions is also limited. Purpose: The aim of this paper is to describe the development of a survey instrument that can be used to explore the characteristics of Australian private physiotherapy practitioners’ interprofessional interactions. Methods: A multiphase process was used to develop the survey instrument. The research team conducted a literature search which resulted in the generation of 34 individual survey items. After the initial pool of survey items was developed, three experienced physiotherapists were invited to review the items. The draft survey instrument was then subject to online testing with private physiotherapy practitioners to evaluate the utility of the instrument. Results: All three physiotherapists invited to review the initial pool of survey items provided written feedback to the research team. Following revision, five private physiotherapy practitioners participated in pilot testing the survey instrument. Pilot testing revealed that approximately 10 minutes was required to complete the online survey. Conclusions: The final survey instrument has 29 questions in six sections with categorical, Likert and free text response options and can be used to explore the characteristics of Australian private physiotherapy practitioners’ interprofessional interactions. Information obtained from future research projects utilising this survey may guide the development of effective interventions aimed at enhancing the nature and quality of clinical interactions between private physiotherapy practitioners and other health practitioners working in Australia

Off-Critical Logarithmic Minimal Models

We consider the integrable minimal models ${\cal M}(m,m';t)$, corresponding to the $\varphi_{1,3}$ perturbation off-criticality, in the {\it logarithmic limit\,} $m, m'\to\infty$, $m/m'\to p/p'$ where $p, p'$ are coprime and the limit is taken through coprime values of $m,m'$. We view these off-critical minimal models ${\cal M}(m,m';t)$ as the continuum scaling limit of the Forrester-Baxter Restricted Solid-On-Solid (RSOS) models on the square lattice. Applying Corner Transfer Matrices to the Forrester-Baxter RSOS models in Regime III, we argue that taking first the thermodynamic limit and second the {\it logarithmic limit\,} yields off-critical logarithmic minimal models ${\cal LM}(p,p';t)$ corresponding to the $\varphi_{1,3}$ perturbation of the critical logarithmic minimal models ${\cal LM}(p,p')$. Specifically, in accord with the Kyoto correspondence principle, we show that the logarithmic limit of the one-dimensional configurational sums yields finitized quasi-rational characters of the Kac representations of the critical logarithmic minimal models ${\cal LM}(p,p')$. We also calculate the logarithmic limit of certain off-critical observables ${\cal O}_{r,s}$ related to One Point Functions and show that the associated critical exponents $\beta_{r,s}=(2-\alpha)\,\Delta_{r,s}^{p,p'}$ produce all conformal dimensions $\Delta_{r,s}^{p,p'}<{(p'-p)(9p-p')\over 4pp'}$ in the infinitely extended Kac table. The corresponding Kac labels $(r,s)$ satisfy $(p s-p' r)^2< 8p(p'-p)$. The exponent $2-\alpha ={p'\over 2(p'-p)}$ is obtained from the logarithmic limit of the free energy giving the conformal dimension $\Delta_t={1-\alpha\over 2-\alpha}={2p-p'\over p'}=\Delta_{1,3}^{p,p'}$ for the perturbing field $t$. As befits a non-unitary theory, some observables ${\cal O}_{r,s}$ diverge at criticality.Comment: 18 pages, 5 figures; version 3 contains amplifications and minor typographical correction

Soil textural heterogeneity impacts bacterial but not fungal diversity

Soils harbour high levels of microbial diversity, underpinning their ability to provide key soil functions and ecosystem services. The extreme variety of soil microbial life is often explained by reference to the physical and chemical heterogeneity of the soil environment. However, detailed understanding of this link is still lacking, particularly as micro-scale studies are difficult to scale up to the soil profile or landscape level. To address this, we used soil samples collected from a wide range of temperate oceanic habitats (e.g. arable, grassland, coniferous and deciduous woodland, heathland; 335 sites in total) to evaluate the link between soil texture and microbial diversity. Soil particle size distribution was measured in each sample using laser granulometry (i.e. sand, silt, clay), while the diversity of bacterial and fungal communities were determined by metabarcoding with an Illumina MiSeq using16S and ITS1 taxonomy marker gene regions, respectively. Multifractal analysis of the soil particle size distribution was then used to describe the heterogeneity of the soil particle sizes. Overall, our results showed no impact of habitat type upon textural heterogeneity indicating that it is an aspect of soil quality resistant to management decisions. Using a structural equation modelling approach, we show that soil textural heterogeneity positively influences bacterial diversity but had little impact upon fungal diversity. We also find that textural composition impacts both bacterial and fungal composition, with many specific microbial taxa showing co-occurrence relationships with clay and fine-silt sized particles. Our results strongly indicate that soil textural heterogeneity influences microbial community diversity regardless of soil management practices and biophysical activities. The close linkages between different groups of soil organisms can obscure the mechanisms driving the development of biodiversity, however, it is clear that the soil physical environment has differential impacts on organisms with different life history strategies

Non-Hermitian quantum mechanics: the case of bound state scattering theory

Excited bound states are often understood within scattering based theories as resulting from the collision of a particle on a target via a short-range potential. We show that the resulting formalism is non-Hermitian and describe the Hilbert spaces and metric operator relevant to a correct formulation of such theories. The structure and tools employed are the same that have been introduced in current works dealing with PT-symmetric and quasi-Hermitian problems. The relevance of the non-Hermitian formulation to practical computations is assessed by introducing a non-Hermiticity index. We give a numerical example involving scattering by a short-range potential in a Coulomb field for which it is seen that even for a small but non-negligible non-Hermiticity index the non-Hermitian character of the problem must be taken into account. The computation of physical quantities in the relevant Hilbert spaces is also discussed

Long term drought and warming alter soil bacterial and fungal communities in an upland heathland

The response of soil microbial communities to a changing climate will impact global biogeochemical cycles, potentially leading to positive and negative feedbacks. However, our understanding of how soil microbial communities respond to climate change and the implications of these changes for future soil function is limited. Here, we assess the response of soil bacterial and fungal communities to long-term experimental climate change in a heathland organo-mineral soil. We analysed microbial communities using Illumina sequencing of the 16S rRNA gene and ITS2 region at two depths, from plots undergoing 4 and 18 years of in situ summer drought or warming. We also assessed the colonisation of Calluna vulgaris roots by ericoid and dark septate endophytic (DSE) fungi using microscopy after 16 years of climate treatment. We found significant changes in both the bacterial and fungal communities in response to drought and warming, likely mediated by changes in soil pH and electrical conductivity. Changes in the microbial communities were more pronounced after a longer period of climate manipulation. Additionally, the subsoil communities of the long-term warmed plots became similar to the topsoil. Ericoid mycorrhizal colonisation decreased with depth while DSEs increased; however, these trends with depth were removed by warming. We largely ascribe the observed changes in microbial communities to shifts in plant cover and subsequent feedback on soil physicochemical properties, especially pH. Our results demonstrate the importance of considering changes in soil microbial responses to climate change across different soil depths and after extended periods of time

Congenital Cardiac Surgery and Parental Perception of Risk: A Quantitative Analysis

Introduction: Interpretation of risk by parents of children undergoing congenital cardiac surgery is poorly documented. The available evidence highlights a dichotomy, where clinicians suggest parents may not grasp the complexity and risk associated with procedures, whilst some parents suggest risk is unnecessarily over-emphasised. Aim: To quantify how risk is perceived by parents Methods: 106 parents of children undergoing cardiac surgery were recruited and completed a Likert scale from 1 (perceived low-risk) to 6 (perceived high-risk), at five points: arrival at pre-admission; post discussion with anaethetist/surgeon; day of surgery; discharge from intensive care; at outpatient follow up. The surgical sample was stratified according to risk adjustment in congenital heart surgery. Analysis: Data was analysed using Wilcoxon rank tests for differences in distributions of scores, and Krippendorff's Alpha to examine level of agreement. Results: Median parental risk scores varied over time, with no consistent risk scores observed. Maternal scores were consistently higher than paternal scores at every time point (p<0.001). Postoperative complications resulted in a persistent rise in risk perception at follow up (p<0.001). Analysis of parental risk scores, and objective measures of surgical risk highlighted poor agreement that was particularly marked at the extremes of risk. Conclusions: Parents perceived higher risk scores than those reported by the clinical team. Mothers reported statistically significant higher scores than their partners, highlighting potential tensions. In addition, the changing perception of risk over time emphasizes the need for flexible levels of support and information as parents navigate uncertainty

Optical Identification of the Hardest X-ray Source in the ASCA Large Sky Survey

We report the optical identification of the hardest X-ray source (AX J131501+3141) detected in an unbiased wide-area survey in the 0.5--10 keV band, the ASCA Large Sky Survey. The X-ray spectrum of the source is very hard and is well reproduced by a power-law component (Gamma = 1.5^+0.7_-0.6) with N_H = 6^+4_-2 *10^22 cm^-2 (Sakano et al. 1998). We have found a galaxy with R=15.62 mag near the center of the error circle for the X-ray source. The optical spectrum of the galaxy shows only narrow emission lines whose ratios correspond to those of a type 2 Seyfert galaxy at z = 0.072, implying an absorption-corrected X-ray luminosity of 2*10^43 erg sec^-1 (2--10 keV) and M_B = -20.93 mag. A radio point source is also associated with the center of the galaxy. We thus identify the X-ray source with this galaxy as an obscured AGN. The hidden nature of the nucleus of the galaxy in the optical band is consistent with the X-ray spectrum. These results support the idea that the obscured AGNs/QSOs contribute significantly to the cosmic X-ray background in the hard band at the faint flux level.Comment: 20 pages with 5 postscript figures, uses aaspp4.sty, Ap.J. Accepte

ISM Properties in Low-Metallicity Environments II. The Dust Spectral Energy Distribution of NGC 1569

We present new 450 and 850 microns SCUBA data of the dwarf galaxy NGC 1569. We construct the mid-infrared to millimeter SED of NGC 1569, using ISOCAM, ISOPHOT, IRAS, KAO, SCUBA and MAMBO data, and model the SED in order to explore the nature of the dust in low metallicity environments. The detailed modeling is performed in a self-consistent way, synthesizing the global ISRF of the galaxy using an evolutionary synthesis model with further constraints provided by the observed MIR ionic lines and a photoionisation model. Our results show that the dust properties are different in this low metallicity galaxy compared to other more metal rich galaxies. The results indicate a paucity of PAHs probably due to the destructive effects of the ISRF penetrating a clumpy environment and a size-segregation of grains where the emission is dominated by small grains of size ~3 nm, consistent with the idea of shocks having a dramatic effect on the dust properties in NGC 1569. A significant millimetre excess is present in the dust SED which can be explained by the presence of ubiquitous very cold dust (T = 5-7 K). This dust component accounts for 40 to 70 % of the total dust mass in the galaxy (1.6 - 3.4 10^5 Msol) and could be distributed in small clumps (size a few pc) throughout the galaxy. We find a gas-to-dust mass ratio of 740 - 1600, larger than that of the Galaxy and a dust-to-metals ratio of 1/4 to 1/7. We generate an extinction curve for NGC 1569, consistent with the modeled dust size distribution. This extinction curve has relatively steep FUV rise and smaller 2175 Angstroms bump, resembling the observed extinction curve of some regions in the Large Magellanic Cloud.Comment: 20 pages, 20 figures, accepted by A&