3,817 research outputs found
Alien Registration- Dexter, A J. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/23847/thumbnail.jp
Aberrational Effects for Shadows of Black Holes
In this paper, we discuss how the shadow of a Kerr black hole depends on the
motion of the observer. In particular, we derive an analytical formula for the
boundary curve of the shadow for an observer moving with given four-velocity at
given Boyer--Lindquist coordinates. We visualize the shadow for various values
of parameters.Comment: 12 pages, 3 figures; Proceedings of the 524. WE-Heraeus-Seminar held
at the Physikzentrum, Bad Honnef, Germany, 17.--23.2.201
Radiative Models of Sagittarius A* and M87 from Relativistic MHD Simulations
Ongoing millimeter VLBI observations with the Event Horizon Telescope allow
unprecedented study of the innermost portion of black hole accretion flows.
Interpreting the observations requires relativistic, time-dependent physical
modeling. We discuss the comparison of radiative transfer calculations from
general relativistic MHD simulations of Sagittarius A* and M87 with current and
future mm-VLBI observations. This comparison allows estimates of the viewing
geometry and physical conditions of the Sgr A* accretion flow. The viewing
geometry for M87 is already constrained from observations of its large-scale
jet, but, unlike Sgr A*, there is no consensus for its millimeter emission
geometry or electron population. Despite this uncertainty, as long as the
emission region is compact, robust predictions for the size of its jet
launching region can be made. For both sources, the black hole shadow may be
detected with future observations including ALMA and/or the LMT, which would
constitute the first direct evidence for a black hole event horizon.Comment: 8 pages, 2 figures, submitted to the proceedings of AHAR 2011: The
Central Kiloparse
Nonlinear optical thresholding in a 4-Channel OCDMA system via two-photon absorption
We demonstrate the use of a Two-Photon Absorption based detector in an OCDMA system. This detector provides a significant performance improvement over standard linear detection
Seven steps for improving influenza vaccination rates in risk-groups: findings from a national cross sectional survey in UK general practice
The problem: Seasonal influenza vaccination rates in at-risk population in the UK are below the national and international target of 75%. Of people aged over 65 years in England 72.8% received influenza (flu) vaccine in 2010/11, just below the target of 75%. However, flu vaccination rates during 2010/11 in the under 65 year old at-risk groups was just 50.4%, which fell far short of 75%; in pregnant women who were not otherwise at risk the vaccination rate was only 36.6%, despite increasing evidence showing the beneficial effects of protection against flu for both mothers and babies. Evidence-based guidance, to advise practices how to optimise all aspects of their flu vaccination campaigns and maximise their likelihood of protecting at-risk patients against flu and its serious sequelae is greatly needed.
This study sought to identify which strategies and procedures were associated with higher rates of flu vaccine uptake.
The approach: An online questionnaire survey was administered to general practitioners (GPs), nursing
staff and practice managers in 795 practices across England. We used logistic regression to analyse data for factors independently associated with higher practice flu vaccination rates in at-risk groups.
Findings: The survey was completed by 569 practice managers, 335 nursing staff and 107 GPs. We identified seven independent factors associated with higher flu vaccination rates. Having a lead staff member for planning the flu campaign and producing a written report of practice performance predicted an 8% higher vaccination rate for at-risk patients aged <65 years (OR 1.37; 95% CI 1.10 to 1.71). These strategies, plus sending a personal invitation to all eligible patients and only stopping vaccination when Quality and Outcomes framework (QOF) targets were reached, predicted a 7% higher vaccination rate (OR 1.45; 95% CI 1.10 to 1.92) in patients aged 65 years and over. Using a lead member of staff for identifying eligible patients, with either a modified manufacturer’s or in-house search program for interrogating the practice computer system, independently
predicted a 4% higher vaccination rate in patients aged 65 years and over (OR 1.22; 95% CI 1.06 to 1.41 / OR 1.20; 95% CI 1.03 to 1.40). The provision of flu vaccine by midwives was associated with a 4% higher vaccination rate in pregnant women (OR 1.19; 1.02 to 1.40).
Consequences: Clear leadership, effective communication with patients, and methods used to identify and contact eligible patients were independently associated with significantly higher rates of flu vaccination. Financial targets appear to incentivise practices to work harder to maximise seasonal influenza vaccine uptake. The strategies identified here could help primary care providers to substantially increase their seasonal flu vaccination rates to meet or even exceed national targets
An Item of Forty-Nine Cents and Its Relation to County Agent Work
Discusses the value of County Farm Agents to farmers and how they have been of great assistance for very little investment through taxes
The County Farm Bureau Picnic
Guide to planning and conducting County Farm Bureau picnics. Offers suggestions for committees, selecting dates and venues, and programing
Reduction of MAI and beat noise in OCDMA systems using an SA-SOA-TPA-based receiver
In this letter, we investigate the removal of multiple access interference and optical beat noise from a two-channel optical system that simulates the output from a time-spread optical code-division multiple access system operating at a data rate of 100 Mb/s. Both noise sources were removed using a saturable absorber semiconductor optical amplifier two-photon absorption receiver structure. Experimental results show error-free operation when all three devices are used together
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