Acknowledgements
•I would like to express my gratitude towards Drs. J.
Lega and N. Mendelson for their advising
on this project, and also Tim Carrol for
assisting in laboratory experiments.
•This material is based upon work supported by the National Science Foundation under VIGRE Grant No DMS9977116. Any
opinions, findings, and conclusions or
recommendations expressed in this material are those of the author and do not necessarily reflect the views
of the National Science Foundation.