Perpendicularly Propagating Plasma Cyclotron Instabilities Simulated with a One-Dimensional Computer Model

1970 ◽  
Vol 13 (7) ◽  
pp. 1819 ◽  
Author(s):  
Jack A. Byers
Keyword(s):  
Computer Model ◽  
One Dimensional

scholarly journals How Hyperpolarization and the Recovery of Excitability Affect Propagation through a Virtual Anode in the Heart

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Nicholas P. Charteris ◽  
Bradley J. Roth
Keyword(s):  
Wave Front ◽  
Time Constant ◽  
Computer Model ◽  
Propagation Speed ◽  
One Dimensional ◽  
Upper Limit ◽  
Rapid Propagation ◽  
Upper Limit Of Vulnerability ◽  
Key Factor ◽  
Sodium Inactivation

Researchers have suggested that the fate of a shock-induced wave front at the edge of a “virtual anode” (a region hyperpolarized by the shock) is a key factor determining success or failure during defibrillation of the heart. In this paper, we use a simple one-dimensional computer model to examine propagation speed through a hyperpolarized region. Our goal is to test the hypothesis that rapid propagation through a virtual anode can cause failure of propagation at the edge of the virtual anode. The calculations support this hypothesis and suggest that the time constant of the sodium inactivation gate is an important parameter. These results may be significant in understanding the mechanism of the upper limit of vulnerability.

15.7 STUDY OF WAVE DYNAMICS OF AN EXTRA-AORTIC COUNTERPULSATION DEVICE IN A ONE-DIMENSIONAL COMPUTER MODEL OF THE ARTERIAL SYSTEM

2016 ◽  
Vol 16 (C) ◽  
pp. 87
Author(s):  
Daime Campos Arias ◽  
Francisco Londono ◽  
Tania Rodriguez Moliner ◽  
Dimitrios Georgakopoulos ◽  
Nikos Stergiopulos ◽  
...  
Keyword(s):  
Computer Model ◽  
Arterial System ◽  
One Dimensional ◽  
Wave Dynamics

PAVDRN: Computer Model for Predicting Water Film Thickness and Potential for Hydroplaning on New and Reconditioned Pavements

1997 ◽  
Vol 1599 (1) ◽  
pp. 128-131 ◽  
Author(s):  
Richard Scott Huebner ◽  
David A. Anderson ◽  
John C. Warner ◽  
Joseph R. Reed
Keyword(s):  
Film Thickness ◽  
Computer Model ◽  
Water Film ◽  
One Dimensional ◽  
Pavement Materials ◽  
Water Film Thickness ◽  
Context Sensitive ◽  
Kinematic Wave Equation ◽  
Geometric Configurations ◽  
State Form

PAVDRN is a computer model that determines the speed at which hydroplaning will be initiated on a section of highway pavement. It is intended to be used by highway engineers before final geometric design to (a) indicate the location of the worst incidence of hydroplaning that is likely to occur on a given section and (b) to rapidly assess different geometric configurations of a section and pavement materials to select a design that will minimize hydroplaning potential. The model is based upon a one-dimensional, steady-state form of the kinematic wave equation. This equation is used in conjunction with relationships for Manning's n that account for the nature of the shallow flow over highway pavements. Ultimately, water-film thickness along a maximum flowpath length is used in empirical expressions to determine the speed at which hydroplaning is likely to occur along this path. The path is determined by analyzing the geometry of the pavement section. Five different geometric sections can be analyzed: ( a) tangent section, ( b) superelevated curve, ( c) transition section, ( d) vertical crest curve, and ( e) vertical sag curve. The user interface was written in Microsoft Visual Basic Version 3.0. It uses context-sensitive help screens. The algorithms for water-film thickness and hydroplaning potential were written in FORTRAN 77.

One-Dimensional Computer Analysis of Oscillatory Flow in Rigid Tubes

1991 ◽  
Vol 113 (4) ◽  
pp. 476-484 ◽  
Author(s):  
F. M. Donovan ◽  
Bruce C. Taylor ◽  
M. C. Su
Keyword(s):  
Computer Model ◽  
Oscillatory Flow ◽  
Damping Ratio ◽  
Navier Stokes ◽  
Navier Stokes Equation ◽  
One Dimensional ◽  
System Parameters ◽  
Two Dimensional Flow ◽  
Flow Effects ◽  
The One

The dynamic characteristics of catheter-transducer systems using rigid tubes with compliance lumped in the transducer and oscillatory flow of fluid in rigid tubes were analyzed. A digital computer model based on one dimensional laminar oscillatory flow was developed and verified by exact solution of the Navier-Stokes Equation. Experimental results indicated that the damping ratio and resistance is much higher at higher frequencies of oscillation than predicted by the one dimensional model. An empirical correction factor was developed and incorporated into the computer model to correct the model to the experimental data. Amplitude of oscillation was found to have no effect on damping ratio so it was concluded that the increased damping ratio and resistance at higher frequencies was not due to turbulence but to two dimensional flow effects. Graphs and equations were developed to calculate damping ratio and undamped natural frequency of a catheter-transducer system from system parameters. Graphs and equations were also developed to calculate resistance and inertance for oscillatory flow in rigid tubes from system parameters and frequency of oscillation.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

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