2,590 research outputs found
Crossing the Boundary: a study of the nature and extent of racism in local league cricket
Since the start of the 1993/4 football season the 'Let's Kick Racism Out of Football’ has had some success in persuading clubs and players to recognise racism in the game and act to counter it. This summer, following our own research (Long et al, 1995) the Rugby Football League and the Commission for Racial Equality launched a 13-point Action Plan for professional clubs to adopt. Within cricket 'Hit Racism for Six' (HR46) was set-up last year to act as a pressure group to stimulate discussion about racism in cricket. Issues of race and racism in sport have recently attracted considerable media attention and stimulated popular debate. Emotion has run high over the articles by Robert Henderson (1995) and Roger Bannister (Connor 1995), the continuing confrontation between Raymond Illingworth and Devon Malcolm, the Botham/Lamb v Khan court case and the trouble on the terraces at Headingley during the summer of 1996. The balance attempted by programmes in the Radio 5 series on ‘Race around the UK’ represented one attempt to encourage a more considered approach, but throughout it has been clear that there is still a shortage of substantive research on race in sport. The Carnegie National Sports Development Centre conducted a study of black and ethnic minorities in cricket in Yorkshire that focused on issues of participation and sports development. Following the success of our rugby league project, Leeds City Council were keen for us to try to explore the more sensitive issues around race and racism. While the study of rugby league had been on the professional game this study of cricket was to be of local league cricket. Within the region this is how most people experience their cricket with some 1,300 teams affiliated to the Yorkshire Cricket Association. To establish views on race and racism we sought responses from: a) the secretaries of local league clubs b) Asian, black and white players in the leagues c) league umpire
Theory of the Resistive Transition in Overdoped : Implications for the angular dependence of the quasiparticle scattering rate in High- superconductors
We show that recent measurements of the magnetic field dependence of the
magnetization, specific heat and resistivity of overdoped
in the vicinity of the superconducting
imply that the vortex viscosity is anomalously small and that the material
studied is inhomogeneous with small, a few hundred , regions in which the
local is much higher than the bulk . The anomalously small
vortex viscosity can be derived from a microscopic model in which the
quasiparticle lifetime varies dramatically around the Fermi surface, being
small everywhere except along the zone diagonal (``cold spot''). We propose
experimental tests of our results.Comment: 4 pages, LaTex, 2 EPS figure
Effects of different 3D QED vertex ansaetze on critical coupling
We study the semi-metal/insulator phase transition in graphene using a
Schwinger-Dyson approach. We consider various forms of vertex ansaetze to
truncate the hierarchy of Schwinger-Dyson equations. We define a Ball-Chiu type
vertex that truncates the equations without violating gauge invariance. We show
that there is a family of these vertices, parametrized by a continuous
parameter that we call a, all of which satisfy the Ward identity. We have
calculated the critical coupling of the phase transition using different values
of a. We have also tested a common approximation in which only the first term
in the Ball-Chiu ansatz is included. This vertex is independent of a, and,
although it is not gauge invariant, it has been used many times in the
literature because of the numerical simplifications it provides. We have found
that, with a one-loop photon polarization tensor, the results obtained for the
critical coupling from the truncated vertex and the full vertex with a = 1
agree very well, but other values of a give significantly different results. We
have also done a fully self-consistent calculation, in which the photons are
backcoupled to the fermion degrees of freedom, for one choice a = 1. Our
results show that when photon dynamics are correctly taken into account, it is
no longer true that the truncated vertex and the full Ball-Chiu vertex with a =
1 agree well. The conclusion is that traditional vertex truncations do not
really make sense in a system that does not respect Lorentz invariance, like
graphene, and the need to include vertex contributions self-consistently is
likely inescapable
Effective Lorentz Force due to Small-angle Impurity Scattering: Magnetotransport in High-Tc Superconductors
We show that a scattering rate which varies with angle around the Fermi
surface has the same effect as a periodic Lorentz force on magnetotransport
coefficients. This effect, together with the marginal Fermi liquid inelastic
scattering rate gives a quantitative explanation of the temperature dependence
and the magnitude of the observed Hall effect and magnetoresistance with just
the measured zero-field resistivity as input.Comment: 4 pages, latex, one epsf figure included in text. Several revisions
and corrections are included. Major conclusions are the sam
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