Nonlinear Dynamics and Chaos
Nonlinear Dynamics and Chaos
2nd Edition
ISBN: 9780813349107
Author: Steven H. Strogatz
Publisher: PERSEUS D
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Chapter 3.7, Problem 6E
Interpretation Introduction

Interpretation:

To reduce the model which is a third order system to a first-order system that can be analyzed by our methods

The equations are

x. = - kxy

y. = kxy - ly

z. = ly

Concept Introduction:

Epidemic model which describes the transmission of communicable diseases through individuals.

People get sick at the rate proportional to product of x and y. Healthy and sick people encounter to each other at rate proportional to their numbers.

Sick people die at a constant rate l.

The given equations are based on the above two assumptions.

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Temperature measurements are based on the transfer of heat between the sensor of a measuring device (such as an ordinary thermometer or the gasket of a thermocouple) and the medium whose temperature is to be measured. Once the sensor or thermometer is brought into contact with the medium, the sensor quickly receives (or loses, if warmer) heat and reaches thermal equilibrium with the medium. At that point the medium and the sensor are at the same temperature. The time required for thermal equilibrium to be established can vary from a fraction of a second to several minutes. Due to its small size and high conductivity it can be assumed that the sensor is at a uniform temperature at all times, and Newton's cooling law is applicable. Thermocouples are commonly used to measure the temperature of gas streams. The characteristics of the thermocouple junction and the gas stream are such that λ = hA/mc 0.02s-1. Initially, the thermocouple junction is at a temperature Ti and the gas stream at…
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