On the zeros of a third degree exponential polynomial with applications to a delayed model for the control of testosterone secretion

Shigui Ruan, Junjie Wei

Research output: Contribution to journalArticle

157 Scopus citations

Abstract

In this paper, we first study the distribution of the zeros of a third degree exponential polynomial. Then we apply the obtained results to a delay model for the control of testosterone secretion. It is shown that under certain assumptions on the coefficients the steady state of the delay model is asymptotically stable for all delay values. Under another set of conditions, there is a critical delay value, the steady is stable when the delay is less than the critical value and unstable when the delay is greater than the critical value. Thus, oscillations via Hopf bifurcation occur at the steady when the delay passes through the critical value. Numerical simulations are presented to illustrate the results.

Original languageEnglish (US)
Pages (from-to)41-52
Number of pages12
JournalIMA Journal of Mathemathics Applied in Medicine and Biology
Volume18
Issue number1
DOIs
StatePublished - Jan 1 2001
Externally publishedYes

Keywords

  • Bifurcation
  • Control of testosterone secretion
  • Delay differential equation
  • Exponential polynomial
  • Stability
  • Steady state

ASJC Scopus subject areas

  • Mathematics (miscellaneous)
  • Agricultural and Biological Sciences (miscellaneous)

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