Negative to Positive Ratio from Nonrelativistic Theories of Pion Photoproduction

1957 ◽  
Vol 105 (6) ◽  
pp. 1933-1933
Author(s):  
Michael J. Moravcsik
Keyword(s):  
Pion Photoproduction ◽  
Positive Ratio

scholarly journals Fully Automatic Fall Risk Assessment Based on a Fast Mobility Test

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1338
Author(s):  
Wojciech Tylman ◽  
Rafał Kotas ◽  
Marek Kamiński ◽  
Paweł Marciniak ◽  
Sebastian Woźniak ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Fall Risk ◽  
Low Cost ◽  
Body Movement ◽  
Sole Source ◽  
Timed Up And Go ◽  
True Negative ◽  
Fall Risk Assessment ◽  
Positive Ratio ◽  
Mobility Test

This paper presents a fall risk assessment approach based on a fast mobility test, automatically evaluated using a low-cost, scalable system for the recording and analysis of body movement. This mobility test has never before been investigated as a sole source of data for fall risk assessment. It can be performed in a very limited space and needs only minimal additional equipment, yet provides large amounts of information, as the presented system can obtain much more data than traditional observation by capturing minute details regarding body movement. The readings are provided wirelessly by one to seven low-cost micro-electro-mechanical inertial measurement units attached to the subject’s body segments. Combined with a body model, these allow segment rotations and translations to be computed and for body movements to be recreated in software. The subject can then be automatically classified by an artificial neural network based on selected values in the test, and those with an elevated risk of falls can be identified. Results obtained from a group of 40 subjects of various ages, both healthy volunteers and patients with vestibular system impairment, are presented to demonstrate the combined capabilities of the test and system. Labelling of subjects as fallers and non-fallers was performed using an objective and precise sensory organization test; it is an important novelty as this approach to subject labelling has never before been used in the design and evaluation of fall risk assessment systems. The findings show a true-positive ratio of 85% and true-negative ratio of 63% for classifying subjects as fallers or non-fallers using the introduced fast mobility test, which are noticeably better than those obtained for the long-established Timed Up and Go test.

THRESHOLD NEUTRAL PION PHOTOPRODUCTION ON THE PROTON AND THE CLOUDY BAG MODEL

1994 ◽  
Vol 09 (05) ◽  
pp. 399-409 ◽  
Author(s):  
A.N. TABACHENKO
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Electric Dipole ◽  
Neutral Pion ◽  
Chiral Symmetry Breaking ◽  
Additional Term ◽  
Pion Photoproduction ◽  
Differential Cross Sections ◽  
Neutral Pions ◽  
K Matrix

The energy dependence of the electric dipole amplitude, the total and differential cross-sections of the photoproduction of neutral pions off protons near threshold is given. The amplitude of process is a sum of the LET prediction and the additional term connected with the chiral symmetry breaking interaction. The simple K-matrix calculations are used to estimate the change in the electric dipole amplitude and the total and differential cross-sections between π0p and π+n thresholds.

Neutral pion photoproduction from the proton near threshold

1996 ◽  
Vol 368 (1-2) ◽  
pp. 20-25 ◽  
Author(s):  
M Fuchs ◽  
J Ahrens ◽  
G Anton ◽  
R Averbeck ◽  
R Beck ◽  
...  
Keyword(s):  
Neutral Pion ◽  
Pion Photoproduction ◽  
Near Threshold

scholarly journals A dressed-bag model study of the short-rangeN  interaction in pion photoproduction processes off the deuteron

2003 ◽  
Vol 29 (9) ◽  
pp. 2207-2226 ◽  
Author(s):  
I T Obukhovsky ◽  
V I Kukulin ◽  
Murat M Kaskulov ◽  
Peter Grabmayr ◽  
Amand Faessler
Keyword(s):  
Pion Photoproduction ◽  
Bag Model ◽  
Model Study

Strong Absorptive Regge-Cut Model for Pion Photoproduction,np→pn, and Related Processes

1970 ◽  
Vol 25 (21) ◽  
pp. 1519-1522 ◽  
Author(s):  
G. L. Kane ◽  
F. Henyey ◽  
D. R. Richards ◽  
Marc Ross ◽  
G. Williamson
Keyword(s):  
Pion Photoproduction

Method of Analysis of Charged Pion Photoproduction

1956 ◽  
Vol 104 (5) ◽  
pp. 1451-1453 ◽  
Author(s):  
Michael J. Moravcsik
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction

scholarly journals Regge approach to charged pion photoproduction at invariant energies above 2 GeV

2007 ◽  
Vol 34 (1) ◽  
Author(s):  
A. Sibirtsev ◽  
J. Haidenbauer ◽  
S. Krewald ◽  
T. -S. H. Lee ◽  
U. -G. Meißner ◽  
...  
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction ◽  
Regge Approach
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