APS Excellence in Physics Education Award
November 2019

Science SPORE Prize
November 2011

The Open Source Physics Project is supported by NSF DUE-0442581.

## Website Detail Page

Decay Process Model
written by Kostas Papamichalis
In this application we study the evolution of a system consisted of N=800 identical, but discrete, cells placed at the vertices of a lattice. Each cell can exist in one of two states A or B. If at time t the j-cell is in state A, the probability p to get transitioned to the state B in the infinitesimal interval [t,t+Dt]  equals wDt, where w is a real constant, named "transition probability per unit time". The value of w is chosen by the user. However, if at time t the j-cell is in state B, it remains in state B with probability 1.

In the simulation a cell is in the state A if its color is orange, and in B if its color is purple. By playing the simulation, we see in real time the transition of each individual cell from state A to state B. The transition happens or not, in one of the time-intervals [tk,tk+Dt], where k=0,1,2,... and Dt=0.1. The decision of each transition is taken by using the random-number generator of JavaScript, with probability p=wDt. In the adjacent, right-sided window, we see two graphs concerning the change with time of a certain Lyapunov functional corresponding to the master equation which describes the evolution of the system toward its equilibrium state. The red graph is the theoretical prediction. The blue one is the experimental graph achieved by counting the cells in state A in real time. The main objective of the simulation is to compare the theoretical predictions with the experimental results.
Subjects Levels Resource Types
Mathematical Tools
- Statistics
Modern Physics
- Nuclear Physics
Thermo & Stat Mech
- Probability
= Probability Density
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- text/html
- application/javascript
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Mirror:
http://users.sch.gr/kostaspapamic…
Access Rights:
Free access
This material is released under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 license.
Rights Holder:
Kostas Papamichalis
Keywords:
Markov process, stochastic process
Record Creator:
Metadata instance created November 19, 2023 by kostas papamichalis
Record Updated:
December 1, 2023 by Wolfgang Christian
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K. Papamichalis, (2023), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=16674&DocID=5842).
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Papamichalis, K. (2023). Decay Process Model. Retrieved September 17, 2024, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=16674&DocID=5842
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@misc{ Author = "Kostas Papamichalis", Title = {Decay Process Model}, Volume = {2024}, Number = {17 September 2024}, Year = {2023} }
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### Decay Process Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

Use the Easy Java Simulations Modeling and Authoring Tool to edit and to explore the source code for the Decay Process Model.

relation by Wolfgang Christian

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