291,008 research outputs found

    The Spectrum from Lattice NRQCD

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    I review recent results for heavy-heavy spectroscopy using Lattice NRQCD. The NRQCD collaboration reports that spin-independent splittings for the Υ\Upsilon are scaling for a sensible range of β\beta values in the quenched approximation. Spin-dependent splittings are not, if the scale is set by spin-independent splittings. Results which include higher order spin-dependent relativistic and discretisation corrections show differences from previous (NRQCD collaboration) results without these. As expected, the differences are small for Υ\Upsilon but rather large for charmonium. New results from the SESAM collaboration for Υ\Upsilon spectroscopy on configurations with Wilson dynamical fermions show good agreement with previous results on HEMCGC configurations with staggered dynamical fermions.Comment: 10 pages, Latex. 10 figures, 7 in postscript. Review for Tsukuba worksho

    Valuing the voluntary sector: rethinking economic analysis

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    The voluntary sector plays an important role in the sports industry, as a provider of sporting opportunities and in the development of sport, from increasing participation through to supporting excellence and elite performance. However, despite this importance, research on its contribution to sport-related economic activity is limited, with information on this sector remaining the weakest part of current economic assessments of the UK sports industry. The research presented in this article examines the economic importance of the voluntary sector, using a case study of Sheffield. It demonstrates that the sports voluntary sector in the city is considerably smaller than was predicted when using national estimates, and that this is largely a consequence of methodological issues relating to previous research. The article suggests that in the light of the findings and the increasing use of sport in urban policy, there is a need to rethink the methodology used to evaluate the economic contribution of the voluntary sector in the future.</p

    Mean link versus average plaquette tadpoles in lattice NRQCD

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    We compare mean-link and average plaquette tadpole renormalization schemes in the context of the quarkonium hyperfine splittings in lattice NRQCD. Simulations are done for the three quarkonium systems ccˉc\bar c, bcˉb\bar c, and bbˉb\bar b. The hyperfine splittings are computed both at leading and at next-to-leading order in the relativistic expansion. Results are obtained at a large number of lattice spacings. A number of features emerge, all of which favor tadpole renormalization using mean links. This includes much better scaling of the hyperfine splittings in the three quarkonium systems. We also find that relativistic corrections to the spin splittings are smaller with mean-link tadpoles, particularly for the ccˉc\bar c and bcˉb\bar c systems. We also see signs of a breakdown in the NRQCD expansion when the bare quark mass falls below about one in lattice units (with the bare quark masses turning out to be much larger with mean-link tadpoles).Comment: LATTICE(heavyqk) 3 pages, 2 figure

    BcB_c Spectroscopy from Lattice QCD

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    We present first results for BcB_c spectroscopy using Lattice Non-Relativistic QCD (NRQCD). For the NRQCD action the leading order spin-dependent and next to leading order spin-independent interactions have been included with tadpole-improved coefficients. We use multi-exponential fits to multiple correlation functions to extract ground and excited SS states and give accurate values for the SS state hyperfine splitting and the P state (BcB^{**}_c) fine structure, including the effects of 1P1/3P1^1P_1/^3P_1 mixing.Comment: 12 pages uuencoded latex file + 1 postscript figur

    Organic principles and research: What implications the new IFOAM principles of organic agriculture?

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    This paper examines some of the implications of the recently approved IFOAM principles of organic agriculture for organic research programmes. In examining the four principles we ask what types of research processes are likely to be in keeping with the principles, who should have the power to defi ne research agendas, and ultimately who should control the output from research programmes. We argue that participatory research programmes incorporating the values and experiences of wider stakeholder groups (including researchers, farmers and consumers) should be regarded as equally important as other research approaches as they are likely to meet many of the underlying intentions of the principles. We are also led to ask whether organic research is increasingly coming to be regarded as an end in itself, almost something apart from the principles, increasingly remote from the end users and consumers, rather than as part of an on-going process aiming to support and promote the organic movement

    Modeling Scavenging for a Hydraulic Free-Piston Engine

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    The hydraulic free-piston engine at the University of Minnesota offers a solution to improve the hydraulic efficiency and reduce emission output of off-road vehicles. We developed a MATLAB Simulink model to track the pressure, temperature, and mass profile of the fuel within the cylinder during operation. By varying different initial conditions of our model, we found that a higher intake manifold pressure and larger bottom dead center location results in higher scavenging efficiency. These results can be used to improve the controller of this engine and better maintain stable operation

    The standardisation of diplomatic in Scottish Royal Acts down to 1249. Part 1: Brieves

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    I argue that there are three principal categories of royal act in Scotland during the period 1100 to 1250: the Brieve, the Letter of Notification, and the Charter. (There are also diplomas, proclamations, treaties, letters of correspondence, and so on, but these were not produced (or at least not preserved) in large enough quantities to be significant in this context.) This article describes how the Brieve became standardised in form
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