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\chapter{CHAPTER FOUR: RESULTS} \label{chapter_4} | ||
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In this thesis, we apply a recently developed technique to | ||
comprehensively categorize all possible families of solitary wave | ||
solutions in two models of topical interest. | ||
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\begin{figure}[!ht] \singlespacing | ||
\begin{center} | ||
\includegraphics[width=.8\textwidth]{figures/homoclinic} %% good idea to keep your figures in a separate folder | ||
\end{center} | ||
\caption{Homoclinic Orbit}\label{tbl:my_first_figure} | ||
\end{figure} | ||
The models considered are: | ||
\begin{itemize} | ||
\item the Generalized Pochammer-Chree Equations, which govern the propagation of longitudinal waves in elastic rods, | ||
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%% Best way to generate pictures, especially graphs, is to save them (say from MATLB) as .eps (Encapsulated PostScript) and than | ||
%% convert to PDF using (attached) eps2pdf utility. Note that pdfTeX will not accept .eps files. | ||
and | ||
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\item generalized microstructure PDE. | ||
\end{itemize} | ||
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Limited analytic results exist for the occurrence of one family | ||
of solitary wave solutions for each of these equations. Since, as | ||
mentioned above, solitary wave solutions often play a central role in | ||
the long-time evolution of an initial disturbance, we consider | ||
such solutions of both models here (via the normal form approach) | ||
within the framework of reversible systems theory. | ||
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Besides confirming | ||
the existence of the known family of solitary waves for each model, | ||
we find a continuum of delocalized solitary waves | ||
(or homoclinics to small-amplitude periodic orbits). | ||
On isolated curves in the relevant parameter region, the delocalized | ||
waves reduce to genuine embedded solitons. | ||
For both models, the new family of solutions occur in regions of | ||
parameter space distinct from the known solitary wave solutions and | ||
are thus entirely new. | ||
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Directions for future work, including the dynamics of each family of | ||
solitary waves using exponential asymptotics techniques, are also mentioned. | ||
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%\newpage |
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