1,929 research outputs found
The DIRAC experiment at CERN
The DIRAC experiment at CERN aims to measure the lifetime of the pionium atom
(), a bound state with an accuracy of 10%. The
experimental setup consists of a high precision magnetic double arm
spectrometer, located at the high intensity proton beam of the CERN Proton
Synchrotron. This measurement will provide - in a model independent way - the
S-wave pion scattering length difference with 5% precision.Comment: Talk presented at the XXXVIIIth Rencontres de Moriond session devoted
to QCD and High Energy Hadronic Interactions. We give a status report of the
DIRAC experiment and present new analysis result
Cattle producers' participation in market channels in Central America: supermarkets, processors, and auctions.
This paper focuses on the determinants and effects of the participation of cattle producers in the supermarket channel, export processor channel, and traditional auction channel. It begins with the analysis of the market channels using qualitative data from 50 interviews of retailers, processors, auction market managers, and other key informants in Costa Rica and Nicaragua, two widely differing cases. It then analyzes patterns and supplies of producers by channel using farm level data (from the authors’ survey of farmers in 2004) from 300 farms in the two countries
Serum procalcitonin for discrimination of blood contamination from bloodstream infection due to coagulase-negative staphylococci
The diagnostic value of serum procalcitonin (PCT) to distinguish blood contamination from bloodstream infection (BSI) due to coagulase-negative staphylococci was evaluated. Patients with BSI had higher PCT concentration than those with blood contamination at day -1, day 0 and day +1 with regard to blood culture collection (p > 0.05), whereas serum C-reactive protein values were significantly higher only on day +1. At a cutoff of 0.1 ng/dl, PCT had a sensitivity of 86% and 100%, and a specificity of 60% and 80% for the diagnosis of BSI on day -1 and 0, respectively. In addition to clinical and microbiological parameters, PCT may help discriminating blood contamination from BSI due coagulase-negative staphylococci
Serum Procalcitonin for Discrimination of Blood Contamination from Bloodstream Infection due to Coagulase-Negative Staphylococci
Abstract : The diagnostic value of serum procalcitonin (PCT) to distinguish blood contamination from bloodstream infection (BSI) due to coagulase-negative staphylococci was evaluated. Patients with BSI had higher PCT concentration than those with blood contamination at day -1, day 0 and day +1 with regard to blood culture collection (p < 0.05), whereas serum C-reactive protein values were significantly higher only on day +1. At a cutoff of 0.1 ng/dl, PCT had a sensitivity of 86% and 100%, and a specificity of 60% and 80% for the diagnosis of BSI on day -1 and 0, respectively. In addition to clinical and microbiological parameters, PCT may help discriminating blood contamination from BSI due coagulase-negative staphylococc
Exact renormalisation group flow for ultracold Fermi gases in unitary limit
We study the exact renormalisation group flow for ultracold Fermi-gases in
unitary regime. We introduce a pairing field to describe the formation of the
Cooper pairs, and take a simple ansatz for the effective action. Set of
approximate flow equations for the effective couplings including boson and
fermionic fluctuations is derived. At some value of the running scale, the
system undergoes a phase transition to a gapped phase. The values of the energy
density, chemical potential, pairing gap and the corresponding proportionality
constants relating the interacting and non-interacting Fermi gases are
calculated. Standard mean field results are recovered if we omit the boson
loops.Comment: 11 pages, Revtex, misprints corrected, references and comments adde
- …