2,269 research outputs found
Glueball-glueball scattering in a constituent gluon model
In this work we use a mapping technique to derive in the context of a
constituent gluon model an effective Hamiltonian that involves explicit gluon
degrees of freedom. We study glueballs with two gluons using the Fock-Tani
formalism. In the present work we consider two possibilities for : (i)
as a pure and calculate, in the context of a quark interchange
picture, the cross-section; (ii) as a glueball where a new calculation for this
cross-section is made, in the context of the constituent gluon model, with
gluon interchange.Comment: Proceedings of the International Workshop IX Hadron Physics and VII
Relativistic Aspects of Nuclear Physics (HADRON-RANP 2004
The utility of hyperlactataemia in the definition of septic shock: Evaluating the Sepsis-3 definitions in a sub-Saharan African intensive care unit
Background. Sepsis-3 definitions were published in 2016 and included hyperlactataemia (serum lactate >2.0 mmol/L) as a mandatory component of the new definition of septic shock. These data were collected mainly from high-income countries and lack adequate validation in scenarios outside these countries.Objectives. To evaluate admission serum lactate as a predictor of intensive care unit (ICU) mortality in patients with infection and hypotension requiring inotropic support.Methods. This was a retrospective observational study of 170 patients with infection and hypotension requiring inotropic support admitted to the ICU at King Edward VIII Hospital in Durban, South Africa. Admission serum lactate was evaluated as a predictor of ICU mortality in this cohort.Results. The study population had a median age of only 42 years. The ICU mortality rate for the cohort was 49.4%. Most patients were surgical (71.8%), with the most common source of sepsis being abdominal (55.9%). The ICU mortality rate was 40.9% in patients with a lactate level ≤2.0 mmol/L and 52.4% in those with a level >2.0 mmol/L; this did not reach statistical significance. The optimal cut-off was 4.5 mmol/L, at which there was a clear, statistically significant difference in mortality between patients without (39.3%) and with hyperlactataemia (59.3%) (p=0.009).Conclusions. Hyperlactataemia was associated with increased mortality. However, a lactate level >2.0 mmol/l, as proposed in Sepsis-3, did not reach statistical significance, and a higher cut-off of >4.5 mmol/L was more appropriate
A pratical way to evaluate synergy
There has been recently a renewed interest in the. concept of synergy due to increasing levels of economic, competitive complexity which are forcing synergy due to increasing levels of economic, technological
organizations to achieve greater benefits from strategic planning to achieve greater benefits from strategic planning. There is however the need for a technique which will enable managers to evaluate on a case by case basis, the potential synergy of a new market entry. To present such a technique is the purpose of the paper.info:eu-repo/semantics/publishedVersio
Meson decay in the Fock-Tani Formalism
The Fock-Tani formalism is a first principle method to obtain effective
interactions from microscopic Hamiltonians. Usually this formalism was applied
to scattering, here we introduced it to calculate partial decay widths for
mesons.Comment: Presented at HADRON05 XI. "International Conference on Hadron
Spectroscopy" Rio de Janeiro, Brazil, August 21 to 26, 200
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