78 research outputs found
The Lowest Order Hadronic Contribution to the Muon Value with Systematic Error Correlations
We have performed a new evaluation of the hadronic contribution to
of the muon with explicit correlations of systematic errors
among the experimental data on . Our result for
the lowest order hadronic vacuum polarization contribution is where the the first error is statistical and
the second is systematic. The total systematic error contributions from below
and above GeV are and respectively, and are hence dominated by the low energy region.
Therefore, new measurements on below 1.4 GeV can
significantly reduce the total error on . In particular, the
effect on the total errors of new hypothetical data with 3 \% statistical and
0.5 - 1.0 \% systematic errors is presented.Comment: LaTeX with REVTeX style and options: multicol,aps,psfig. 18 pages,
postscript figures included after text. Accepted in Phys. Rev. D (~ Sept
1996
Coronavirus disease 2019 (COVID-19) pandemic across Africa : current status of vaccinations and implications for the future
The introduction of effective vaccines in December 2020 marked a significant step forward in the global response to COVID-19. Given concerns with access, acceptability, and hesitancy across Africa, there is a need to describe the current status of vaccine uptake in the continent. An exploratory study was undertaken to investigate these aspects, current challenges, and lessons learnt across Africa to provide future direction. Senior personnel across 14 African countries completed a self-administered questionnaire, with a descriptive analysis of the data. Vaccine roll-out commenced in March 2021 in most countries. COVID-19 vaccination coverage varied from low in Cameroon and Tanzania and up to 39.85% full coverage in Botswana at the end of 2021; that is, all doses advocated by initial protocols versus the total population, with rates increasing to 58.4% in Botswana by the end of June 2022. The greatest increase in people being fully vaccinated was observed in Uganda (20.4% increase), Botswana (18.5% increase), and Zambia (17.9% increase). Most vaccines were obtained through WHO-COVAX agreements. Initially, vaccination was prioritised for healthcare workers (HCWs), the elderly, adults with co-morbidities, and other at-risk groups, with countries now commencing vaccination among children and administering booster doses. Challenges included irregular supply and considerable hesitancy arising from misinformation fuelled by social media activities. Overall, there was fair to reasonable access to vaccination across countries, enhanced by government initiatives. Vaccine hesitancy must be addressed with context-specific interventions, including proactive programmes among HCWs, medical journalists, and the public
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Preliminary results from the CMD-2 detector
A new general-purpose detector CMD-2 (calorimetric magnetic detector has started experiments at the upgraded e{sup {plus}}e{sup {minus}} collider VEPP-2M (collider for electron-positron beams) at Novosibirsk. During early runs an integrated luminosity of about 400 inverse nanobarns has been collected in the center of mass energy range 400{endash}1030 MeV
A Ceramic Waste Heat Recovery System on a Rotary Forge Furnace: An Installation and Operating History
In the fall of 1980, the Reed Rock Bit Company (Houston, Texas) placed a Hague International high temperature energy conservation system on a rotary hearth furnace used to heat steel billets for forging. The energy conservation system includes a heavy duty high temperature ceramic tube recuperator and five high temperature recirculating burners.
The energy conservation system was retrofitted onto a rotary hearth furnace with an inside diameter of 11' 5'' (3.5m) and an available hearth area of approximately 75 square feet (7m2). The system has an installed burner capacity of 3MMBtu/hr (2,345kW).
Before retrofitting, furnace thermodynamic performance data were collected. The amount of energy used to bring a mass unit of steel to forging temperature during typical heating cycles was 3,921 Btu/lb (9.12 x 106 J/kg). After in installation of the heat recovery system, the thermo dynamic performance of the improved furnace was calculated. The amount of energy used to bring a mass unit of steel to forging temperature during typical heating cycles in the retrofitted furnace was 1,798 Btu/lb (4.18 x 106 J/kg), demonstrating a fuel reduction of 54.1
Local regulation of interchange turbulence in a dipole-confined plasma torus using current-collection feedbacka)
Cyclic changes in Turonian to Coniacian planktic foraminiferal assemblages from the tropical Atlantic Ocean
Comparison of four depth-encoding PET detector modules with wavelength shifting (WLS) and optical fiber read-out
Labor progression of women attempting vaginal birth after previous cesarean delivery with or without epidural analgesia
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