scholarly journals New Polarizability Functions for Calculating Atomic Hydrogen S State Spectral Lines in Exact Agreement with NIST Measurements

2020 ◽  
Author(s):  
Wayne Surdoval
Keyword(s):  
Atomic Hydrogen ◽  
Spectral Lines ◽  
Exact Agreement

scholarly journals Collisional depolarization and transfer rates of spectral lines by atomic hydrogen

2003 ◽  
Vol 409 (1) ◽  
pp. 369-373 ◽  
Author(s):  
M. Derouich ◽  
S. Sahal-Bréchot ◽  
P. S. Barklem
Keyword(s):  
Atomic Hydrogen ◽  
Spectral Lines ◽  
Transfer Rates

scholarly journals The broadening of metallic lines in cool stars

1997 ◽  
Vol 189 ◽  
pp. 179-183
Author(s):  
S. D. Anstee ◽  
B. J. O'Mara ◽  
J. E. Ross
Keyword(s):  
Excellent Agreement ◽  
Atomic Hydrogen ◽  
Spectral Lines ◽  
Temperature Structure ◽  
The Sun ◽  
Solar Abundance ◽  
Cool Stars ◽  
B Lines

A theory for the broadening of spectral lines by collisions with atomic hydrogen developed by Anstee and O'Mara [1] is described and when applied to strong lines of elements in the sun leads to abundances which are independent of non-thermal motions in the photosphere and in excellent agreement with meteoritic values. In the case of the solar abundance of iron the results lead to a resolution of recent conflict concerning possible differences between the abundance of iron in the sun and meteorites. Excellent results obtained with the Mg b-lines permit these lines to be used in abundance determinations in other stars and also makes them particularly useful in determining the temperature structure in cool stars.

scholarly journals Collisional depolarization and transfer rates of spectral lines by atomic hydrogen

2004 ◽  
Vol 426 (2) ◽  
pp. 707-715 ◽  
Author(s):  
M. Derouich ◽  
S. Sahal-Bréchot ◽  
P. S. Barklem
Keyword(s):  
Atomic Hydrogen ◽  
Spectral Lines ◽  
Transfer Rates

scholarly journals On the collisional depolarization and transfer rates of spectral lines by atomic hydrogen

2004 ◽  
Vol 414 (1) ◽  
pp. 373-376 ◽  
Author(s):  
M. Derouich ◽  
S. Sahal-Bréchot ◽  
P. S. Barklem
Keyword(s):  
Atomic Hydrogen ◽  
Spectral Lines ◽  
Transfer Rates

The Interpretation of Line Profiles

1977 ◽  
Vol 36 ◽  
pp. 191-215
Author(s):  
G.B. Rybicki
Keyword(s):  
Magnetic Fields ◽  
Atomic Physics ◽  
Velocity Fields ◽  
Spectral Lines ◽  
Inhomogeneous Structure ◽  
The Sun ◽  
Line Profiles ◽  
Physical Phenomena

Observations of the shapes and intensities of spectral lines provide a bounty of information about the outer layers of the sun. In order to utilize this information, however, one is faced with a seemingly monumental task. The sun’s chromosphere and corona are extremely complex, and the underlying physical phenomena are far from being understood. Velocity fields, magnetic fields, Inhomogeneous structure, hydromagnetic phenomena – these are some of the complications that must be faced. Other uncertainties involve the atomic physics upon which all of the deductions depend.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

Exploring the Validity and Operational Impact of Using Allied Health Assistants to Conduct Dysphagia Screening for Low-Risk Patients Within the Acute Hospital Setting

2020 ◽  
Vol 29 (4) ◽  
pp. 1944-1955 ◽  
Author(s):  
Maria Schwarz ◽  
Elizabeth C. Ward ◽  
Petrea Cornwell ◽  
Anne Coccetti ◽  
Pamela D'Netto ◽  
...  
Keyword(s):  
At Risk ◽  
Allied Health ◽  
Assessment Tool ◽  
Hospital Setting ◽  
Low Risk ◽  
False Negatives ◽  
Exact Agreement ◽  
Risk Patients ◽  
Impact Phase ◽  
Operational Impact

Purpose The purpose of this study was to examine (a) the agreement between allied health assistants (AHAs) and speech-language pathologists (SLPs) when completing dysphagia screening for low-risk referrals and at-risk patients under a delegation model and (b) the operational impact of this delegation model. Method All AHAs worked in the adult acute inpatient settings across three hospitals and completed training and competency evaluation prior to conducting independent screening. Screening (pass/fail) was based on results from pre-screening exclusionary questions in combination with a water swallow test and the Eating Assessment Tool. To examine the agreement of AHAs' decision making with SLPs, AHAs ( n = 7) and SLPs ( n = 8) conducted an independent, simultaneous dysphagia screening on 51 adult inpatients classified as low-risk/at-risk referrals. To examine operational impact, AHAs independently completed screening on 48 low-risk/at-risk patients, with subsequent clinical swallow evaluation conducted by an SLP with patients who failed screening. Results Exact agreement between AHAs and SLPs on overall pass/fail screening criteria for the first 51 patients was 100%. Exact agreement for the two tools was 100% for the Eating Assessment Tool and 96% for the water swallow test. In the operational impact phase ( n = 48), 58% of patients failed AHA screening, with only 10% false positives on subjective SLP assessment and nil identified false negatives. Conclusion AHAs demonstrated the ability to reliably conduct dysphagia screening on a cohort of low-risk patients, with a low rate of false negatives. Data support high level of agreement and positive operational impact of using trained AHAs to perform dysphagia screening in low-risk patients.

Sign in / Sign up

Export Citation Format

Share Document