2,687 research outputs found

    The South African King IV Report on corporate governance: is the crown shiny enough?

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    PRS36 Content Validity of Two Symptom Questionnaires for Idiopathic Pulmonary Fibrosis

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    Low-energy electronic properties of clean CaRuO3_3: elusive Landau quasiparticles

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    We have prepared high-quality epitaxial thin films of CaRuO3_3 with residual resistivity ratios up to 55. Shubnikov-de Haas oscillations in the magnetoresistance and a T2T^2 temperature dependence in the electrical resistivity only below 1.5 K, whose coefficient is substantially suppressed in large magnetic fields, establish CaRuO3_3 as a Fermi liquid (FL) with anomalously low coherence scale. Non-Fermi liquid (NFL) T3/2T^{3/2} dependence is found between 2 and 25 K. The high sample quality allows access to the intrinsic electronic properties via THz spectroscopy. For frequencies below 0.6 THz, the conductivity is Drude-like and can be modeled by FL concepts, while for higher frequencies non-Drude behavior, inconsistent with FL predictions, is found. This establishes CaRuO3_3 as a prime example of optical NFL behavior in the THz range.Comment: 12 pages, 21 figures including supplemental materia

    Engaging stakeholders in corporate decision-making through strategic reporting: an empirical study of FTSE 100 companies (Part 2)

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    Non-financial reporting has risen in significance in recent years as the role of stakeholders who are not shareholders has been recognised in corporate governance frameworks. In the UK the ‘strategic reporting’ provisions of the Companies Act 2006 give effect to this policy. In Part 1 we examined the strategic reports of the FTSE 100 companies from 2015 and 2016 and focused on compliance by companies with nonfinancial reporting requirements. We found that compliance with those requirements was very high, amounting even to super or over-compliance. This article (Part 2 of the project) assesses the quality of non-financial reporting through a series of interviews. It evaluates whether the current regulatory framework on non-financial reporting in the UK informs stakeholders adequately so as to facilitate effective engagement in corporate decision-making

    Surface Alfven Wave Damping in a 3D Simulation of the Solar Wind

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    Here we investigate the contribution of surface Alfven wave damping to the heating of the solar wind in minima conditions. These waves are present in regions of strong inhomogeneities in density or magnetic field (e. g., the border between open and closed magnetic field lines). Using a 3-dimensional Magnetohydrodynamics (MHD) model, we calculate the surface Alfven wave damping contribution between 1-4 solar radii, the region of interest for both acceleration and coronal heating. We consider waves with frequencies lower than those that are damped in the chromosphere and on the order of those dominating the heliosphere. In the region between open and closed field lines, within a few solar radii of the surface, no other major source of damping has been suggested for the low frequency waves we consider here. This work is the first to study surface Alfven waves in a 3D environment without assuming a priori a geometry of field lines or magnetic and density profiles. We determine that waves with frequencies >2.8x10^-4 Hz are damped between 1-4 solar radii. In quiet sun regions, surface Alfven waves are damped at further distances compared to active regions, thus carrying additional wave energy into the corona. We compare the surface Alfven wave contribution to the heating by a variable polytropic index and find that it an order of magnitude larger than needed for quiet sun regions. For active regions the contribution to the heating is twenty percent. As it has been argued that a variable gamma acts as turbulence, our results indicate that surface Alfven wave damping is comparable to turbulence in the lower corona. This damping mechanism should be included self consistently as an energy driver for the wind in global MHD models.Comment: Accepted to ApJ (scheduled September '09), 22 pages, 8 figure

    Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence

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    We measured the ratio Px/PzP_{x}/P_{z} of the transverse to longitudinal components of polarization transferred from electrons to bound protons in 12C^{12}\mathrm{C} by the 12C(e⃗,eâ€Čp⃗)^{12}\mathrm{C}(\vec{e},e'\vec{p}) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, (Px/Pz)12C/(Px/Pz)1H(P_{x}/P_{z})_{^{12}\mathrm{C}}/(P_{x}/P_{z})_{^{1}\mathrm{H}}, for both ss- and pp-shell knocked out protons, even though they are embedded in averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from 2H^{2}\mathrm{H} and 4He^{4}\mathrm{He}, suggesting a universal behavior. It further implies no dependence on average local nuclear density

    Transition from the Couette-Taylor system to the plane Couette system

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    We discuss the flow between concentric rotating cylinders in the limit of large radii where the system approaches plane Couette flow. We discuss how in this limit the linear instability that leads to the formation of Taylor vortices is lost and how the character of the transition approaches that of planar shear flows. In particular, a parameter regime is identified where fractal distributions of life times and spatiotemporal intermittency occur. Experiments in this regime should allow to study the characteristics of shear flow turbulence in a closed flow geometry.Comment: 5 pages, 5 figure
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