University of Tennessee

About: University of Tennessee is a education organization based out in Knoxville, Tennessee, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 41976 authors who have published 87043 publications receiving 2828517 citations. The organization is also known as: UTK & UT Knoxville.

A tutorial on Reed-Solomon coding for fault-tolerance in RAID-like systems

Abstract: SUMMARY It is well-known that Reed-Solomon codes may be used to provide error correction for multiple failures in RAID-like systems. The coding technique itself, however, is not as well-known. To the coding theorist, this technique is a straightforward extension to a basic coding paradigm and needs no special mention. However, to the systems programmer with no training in coding theory, the technique may be a mystery. Currently, there are no references that describe how to perform this coding that do not assume that the reader is already well-versed in algebra and coding theory. This paper is intended for the systems programmer. It presents a complete specification of the coding algorithm plus details on how it may be implemented. This specification assumes no prior knowledge of algebra or coding theory. The goal of this paper is for a systems programmer to be able to implement Reed-Solomon coding for reliability in RAID-like systems without needing to consult any external references. ©1997 by John Wiley & Sons, Ltd.

Evidence for an excess of B̄→D( *)τ -ν ̄τ decays

Abstract: Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B -> D(*) l Nu), where l is either e or mu. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D) = 0.440 +- 0.058 +- 0.042 and R(D*) = 0.332 +- 0.024 +- 0.018, which exceed the Standard Model expectations by 2.0 sigma and 2.7 sigma, respectively. Taken together, our results disagree with these expectations at the 3.4 sigma level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model. We also report the observation of the decay B -> D Tau Nu, with a significance of 6.8 sigma.

Positron Production in Multiphoton Light-by-Light Scattering

Abstract: A signal of 106 {+-} 14 positrons above background has been observed in collisions of a low-emittance 46.6-GeV electron beam with terawatt pulses from a Nd:glass laser at 527 nm wavelength in an experiment at the Final Focus Test Beam at SLAC. Peak laser intensities of {approximately} 1.3 {times} 10{sup 18} W/cm{sup 2} have been achieved corresponding to a value of 0.3 for the parameter {Upsilon} = {var_epsilon}*/{var_epsilon}{sub crit} where {var_epsilon}* = 2{gamma}{var_epsilon}{sub lab} is the electric field strength of the laser transformed to the rest frame of the electron beam and {var_epsilon}{sub crit} = m{sup 2}c{sup 3}/e{bar h} = 1.3 {times} 10{sup 16} V/cm is the QED critical field strength. The positrons are interpreted as arising from a two-step process in which laser photons are backscattered to GeV energies by the electron beam followed by a collision between the high-energy photon and several laser photons to produce an electron-positron pair. These results are the first laboratory evidence for a light-by-light scattering process involving only real photons.

CSR and environmental responsibility: motives and pressures to adopt green management practices

Abstract: This paper examines the diffusion of environmental management initiatives in business and the motives and pressures reported by senior executives to adopt these practices in one industry. We frame these sustainable practices under the umbrella of corporate social responsibility (CSR) and examine the causal drivers of environmental behavior. This study used a mixed-methods approach and included a survey and 17 in-depth interviews with professional sports team and league executives. Data revealed both strategic and legitimacy motives to adopt environmental management practices. More specifically, the analysis suggested that strategic motives were the primary reason for adopting an environmental CSR focus. Motives to address institutional pressures were also found, although to a lesser extent. The paper discusses the role and relevance environmentally focused CSR plays in professional sport organizations in North America and presents suggestions for future research in this area. Copyright © 2010 John Wiley & Sons, Ltd and ERP Environment.