On the threshold behavior of the negative to positive ratio in pion photoproduction

1958 ◽  
Vol 7 (4) ◽  
pp. 442-450 ◽  
Author(s):  
M. J. Moravcsik
Keyword(s):  
Pion Photoproduction ◽  
Threshold Behavior ◽  
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.

Study on Threshold Behavior of Operation Voltage in Metal Filament-Based Polymer Memory

2007 ◽  
Vol 111 (27) ◽  
pp. 7756-7760 ◽  
Author(s):  
Won-Jae Joo ◽  
Tae-Lim Choi ◽  
Kwang-Hee Lee ◽  
Youngsu Chung
Keyword(s):  
Threshold Behavior ◽  
Metal Filament ◽  
Polymer Memory

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.

Velocity-dependent threshold behavior of wearless nano-friction

2008 ◽  
Vol 44 (1) ◽  
pp. 152-155
Author(s):  
Keiji Hayashi ◽  
Daisuke Tanaka ◽  
Harumi Araki ◽  
Tomoki Maruyama ◽  
Daisuke Matsumura ◽  
...  
Keyword(s):  
Threshold Behavior

Predicting Sulfidic and Naphthenic Acid Corrosion

CORROSION ◽  
2009 ◽  
Vol 65 (12) ◽  
pp. 831-844 ◽  
Author(s):  
J. Hau
Keyword(s):  
Shear Stress ◽  
Exposure Time ◽  
Acid Corrosion ◽  
Naphthenic Acid ◽  
Naphthenic Acids ◽  
Sulfur Compounds ◽  
Velocity Shear ◽  
Threshold Behavior ◽  
Temperature Range ◽  
Si Content

Abstract This paper reviews the factors that are hindering the development of models to predict corrosion due to sulfur compounds, naphthenic acids, or both, acting simultaneously on steels within the temperature range typically from 230°C to 400°C. These factors are identified as data scattering that do not distribute normally, variables or factors that do not exert their influence in a gradual manner but as a threshold behavior, and the interactions between the factors of sulfidic and naphthenic acid corrosion; exposure time, temperature, and velocity (shear stress); and the chromium and molybdenum content of the steels (Si content is not discussed). Not dealing with the interactions is probably the largest obstacle, followed by data scattering.

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