1,814 research outputs found

    Six-component measurements on a straight and a 35 degree swept-back trapezoidal wing with and without split flaps

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    In accord with me test program (published in reference 7) the wing in question is briefly designated as No. 5. It differs from the rectangular wing discussed in reference 7 by its taper and from the 35O swept-back trapezoidal wing treated in reference 8 by the absence of sweepbaok

    The role of patients in European Clinical Ethics Consultation

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    Clinical ethics committees and consultation services have existed in many European countries for over two decades. Many different modes of operation have emerged, each reflecting a particular health and socio-political context. As additional clinical ethics services become established, the role of patients and their relatives is attracting increased attention. In North America, patient involvement has been theoretically lauded and recommended by policy, but nevertheless is often neglected in practice.1 In Europe, this issue has not yet received a great deal of attention, although the importance of listening to the patient's voice has been recognized for some time.2 Despite this, patients have diverse involvement in European clinical ethics support. Patients or their relatives can, for example: be members of a clinical ethics committee; be notified when an ethics consultation is requested; or be involved in ethical deliberation to the same extent as clinicians. At the 4th International Conference on Clinical Ethics and Consultation,3 Professor Stella Reiter-Theil convened an expert panel to discuss: ‘Whether and how to involve patients and relatives in clinical ethics support’. Panellists from across Europe4 used a case study to engage in a lively and interactive discussion on the different approaches to patient involvement in clinical ethics consultation.This article was written by Dr Ainsley Newson during the time of her employment with the University of Bristol, UK (2006-2012). Self-archived in the Sydney eScholarship Repository with permission of Bristol University, Sept 2014

    The role of patients in European Clinical Ethics Consultation

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    editorialClinical ethics committees and consultation services have existed in many European countries for over two decades. Many different modes of operation have emerged, each reflecting a particular health and socio-political context. As additional clinical ethics services become established, the role of patients and their relatives is attracting increased attention. In North America, patient involvement has been theoretically lauded and recommended by policy, but nevertheless is often neglected in practice.1 In Europe, this issue has not yet received a great deal of attention, although the importance of listening to the patient's voice has been recognized for some time.2 Despite this, patients have diverse involvement in European clinical ethics support. Patients or their relatives can, for example: be members of a clinical ethics committee; be notified when an ethics consultation is requested; or be involved in ethical deliberation to the same extent as clinicians. At the 4th International Conference on Clinical Ethics and Consultation,3 Professor Stella Reiter-Theil convened an expert panel to discuss: ‘Whether and how to involve patients and relatives in clinical ethics support’. Panellists from across Europe4 used a case study to engage in a lively and interactive discussion on the different approaches to patient involvement in clinical ethics consultation.This article was written by Dr Ainsley Newson during the time of her employment with the University of Bristol, UK (2006-2012). Self-archived in the Sydney eScholarship Repository with permission of Bristol University, Sept 2014

    Changing Seasonal Rainfall Distribution With Climate Directs Contrasting Impacts at Evapotranspiration and Water Yield in the Western Mediterranean Region

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    Over the past century, climate change has been reflected in altered precipitation regimes worldwide. Because evapotranspiration is sensitive to both water availability and atmospheric demand for water vapor, it is essential to assess the likely consequences of future changes of these climate variables to evapotranspiration and, thus, runoff. We propose a simplified approach for annual evapotranspiration predictions, based on seasonal evapotranspiration estimates, accounting for the strong seasonality of meteorological conditions typical of Mediterranean climate, still holding the steady state assumption of basin water balance at mean annual scale. Sardinian runoff decreased over the 1975-2010 period by more than 40% compared to the preceding 1922-1974 period. Most of annual runoff in Sardinian basins is produced by winter precipitation, a wet season with relatively high evaporation rates. We derived linear seasonal evapotranspiration responses to seasonal precipitation, and, in turn, a relationship between the parameters of the linear functions and the seasonal vapor pressure deficit (D), accounting for residuals with basin properties. We then used these relationships to predict evapotranspiration and runoff using future Intergovernmental Panel on Climate Change climate scenarios, considering changing precipitation and D seasonality. We show that evapotranspiration is insensitive to D scenario changes. Although both evapotranspiration and runoff are sensitive to precipitation seasonality, future changes in runoff are related only to changes of winter precipitation, while evapotranspiration changes are related to those of spring and summer precipitation. Future scenario predicting further runoff decline is particularly alarming for the Sardinian water resources system, requiring new strategies and designs in water resources planning and management.Peer reviewe

    Solitonic lattice and Yukawa forces in the rare earth orthoferrite TbFeO3

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    The control of domains in ferroic devices lies at the heart of their potential for technological applications. Multiferroic materials offer another level of complexity as domains can be either or both of a ferroelectric and magnetic nature. Here we report the discovery of a novel magnetic state in the orthoferrite TbFeO3 using neutron diffraction under an applied magnetic field. This state has a very long incommensurate period ranging from 340 Angstrom at 3K to 2700 Angstrom at the lowest temperatures and exhibits an anomalously large number of higher-order harmonics, allowing us to identify it with the periodic array of sharp domain walls of Tb spins separated by many lattice constants. The Tb domain walls interact by exchanging spin waves propagating through the Fe magnetic sublattice. The resulting Yukawa-like force, familiar from particle physics, has a finite range that determines the period of the incommensurate state.Comment: 11 pages 14 figure

    Continuum Surface Energy from a Lattice Model

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    We investigate connections between the continuum and atomistic descriptions of deformable crystals, using certain interesting results from number theory. The energy of a deformed crystal is calculated in the context of a lattice model with general binary interactions in two dimensions. A new bond counting approach is used, which reduces the problem to the lattice point problem of number theory. The main contribution is an explicit formula for the surface energy density as a function of the deformation gradient and boundary normal. The result is valid for a large class of domains, including faceted (polygonal) shapes and regions with piecewise smooth boundaries.Comment: V. 1: 10 pages, no fig's. V 2: 23 pages, no figures. Misprints corrected. Section 3 added, (new results). Intro expanded, refs added.V 3: 26 pages. Abstract changed. Section 2 split into 2. Section (4) added material. V 4, 28 pages, Intro rewritten. Changes in Sec.5 (presentation only). Refs added.V 5,intro changed V.6 address reviewer's comment

    Striped periodic minimizers of a two-dimensional model for martensitic phase transitions

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    In this paper we consider a simplified two-dimensional scalar model for the formation of mesoscopic domain patterns in martensitic shape-memory alloys at the interface between a region occupied by the parent (austenite) phase and a region occupied by the product (martensite) phase, which can occur in two variants (twins). The model, first proposed by Kohn and Mueller, is defined by the following functional: E(u)=ÎČ∣∣u(0,⋅)∣∣H1/2([0,h])2+∫0Ldx∫0hdy(∣ux∣2+Ï”âˆŁuyy∣){\cal E}(u)=\beta||u(0,\cdot)||^2_{H^{1/2}([0,h])}+ \int_{0}^{L} dx \int_0^h dy \big(|u_x|^2 + \epsilon |u_{yy}| \big) where u:[0,L]×[0,h]→Ru:[0,L]\times[0,h]\to R is periodic in yy and uy=±1u_y=\pm 1 almost everywhere. Conti proved that if ÎČâ‰łÏ”L/h2\beta\gtrsim\epsilon L/h^2 then the minimal specific energy scales like ∌min⁥{(Ï”ÎČ/L)1/2,(Ï”/L)2/3}\sim \min\{(\epsilon\beta/L)^{1/2}, (\epsilon/L)^{2/3}\}, as (Ï”/L)→0(\epsilon/L)\to 0. In the regime (Ï”ÎČ/L)1/2â‰Ș(Ï”/L)2/3(\epsilon\beta/L)^{1/2}\ll (\epsilon/L)^{2/3}, we improve Conti's results, by computing exactly the minimal energy and by proving that minimizers are periodic one-dimensional sawtooth functions.Comment: 29 pages, 3 figure

    Forecasting the price of gold

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    This article seeks to evaluate the appropriateness of a variety of existing forecasting techniques (17 methods) at providing accurate and statistically significant forecasts for gold price. We report the results from the nine most competitive techniques. Special consideration is given to the ability of these techniques to provide forecasts which outperforms the random walk (RW) as we noticed that certain multivariate models (which included prices of silver, platinum, palladium and rhodium, besides gold) were also unable to outperform the RW in this case. Interestingly, the results show that none of the forecasting techniques are able to outperform the RW at horizons of 1 and 9 steps ahead, and on average, the exponential smoothing model is seen providing the best forecasts in terms of the lowest root mean squared error over the 24-month forecasting horizons. Moreover, we find that the univariate models used in this article are able to outperform the Bayesian autoregression and Bayesian vector autoregressive models, with exponential smoothing reporting statistically significant results in comparison with the former models, and classical autoregressive and the vector autoregressive models in most cases

    A Rejoinder on Energy versus Impact Indicators

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    Citation distributions are so skewed that using the mean or any other central tendency measure is ill-advised. Unlike G. Prathap's scalar measures (Energy, Exergy, and Entropy or EEE), the Integrated Impact Indicator (I3) is based on non-parametric statistics using the (100) percentiles of the distribution. Observed values can be tested against expected ones; impact can be qualified at the article level and then aggregated.Comment: Scientometrics, in pres
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