Monte Carlo analysis of the three-dimensional Ising model

1992 ◽  
Author(s):  
Nobuyasu Ito
Keyword(s):  
Monte Carlo ◽  
Ising Model ◽  
Three Dimensional ◽  
Monte Carlo Analysis

scholarly journals Monte Carlo Analysis of Optical Interactions in Reflectance and Transmittance Finger Photoplethysmography

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 789 ◽  
Author(s):  
Subhasri Chatterjee ◽  
Panayiotis Kyriacou
Keyword(s):  
Monte Carlo ◽  
Penetration Depth ◽  
Three Dimensional ◽  
Region Of Interest ◽  
Monte Carlo Analysis ◽  
Optical Parameters ◽  
Arterial Blood ◽  
Fundamental Information ◽  
The Individual ◽  
Human Finger

Photoplethysmography (PPG) is a non-invasive photometric technique that measures the volume changes in arterial blood. Recent studies have reported limitations in developing and optimising PPG-based sensing technologies due to unavailability of the fundamental information such as PPG-pathlength and penetration depth in a certain region of interest (ROI) in the human body. In this paper, a robust computational model of a dual wavelength PPG system was developed using Monte Carlo technique. A three-dimensional heterogeneous volume of a specific ROI (i.e., human finger) was exposed at the red (660 nm) and infrared (940 nm) wavelengths in the reflectance and transmittance modalities of PPG. The optical interactions with the individual pulsatile and non-pulsatile tissue-components were demonstrated and the optical parameters (e.g., pathlength, penetration depth, absorbance, reflectance and transmittance) were investigated. Results optimised the source-detector separation for a reflectance finger-PPG sensor. The analysis with the recorded absorbance, reflectance and transmittance confirmed the maximum and minimum impact of the dermis and bone tissue-layers, respectively, in the formation of a PPG signal. The results presented in the paper provide the necessary information to develop PPG-based transcutaneous sensors and to understand the origin of the ac and dc components of the PPG signal.

Monte Carlo Renormalization of the Three-Dimensional Ising Model: The Influence of Truncation

1989 ◽  
Vol 10 (2) ◽  
pp. 105-109 ◽  
Author(s):  
H. W. J Blöte ◽  
J. A. de Bruin ◽  
A Compagner ◽  
J. H Croockewit ◽  
Y. T. J. C Fonk ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ising Model ◽  
Three Dimensional

MONTE-CARLO ANALYSIS OF THE ABELIAN SURFACE GAUGE MODEL

1992 ◽  
Vol 07 (18) ◽  
pp. 1601-1607 ◽  
Author(s):  
M. BAIG ◽  
A. TRIAS
Keyword(s):  
Monte Carlo ◽  
Phase Structure ◽  
Three Dimensional ◽  
Monte Carlo Analysis ◽  
Abelian Surface ◽  
Gauge Model ◽  
Monte Carlo Techniques ◽  
Gauge Models ◽  
Lattice Gauge ◽  
Duality Relations

We present the first numerical results from a lattice formulation of the Abelian surface gauge model which accounts for three-index fields required in theories based on an antisymmetrical potential. For this purpose we have defined a lattice gauge model in such a way that field variables are assigned to the plaquettes and the interaction is defined through elementary three-dimensional cubes. The phase structure of the Abelian Z(2) case has been determined using Monte-Carlo techniques. Duality relations to spin and gauge models are also studied.

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