This paper is based on part of the Ph.D. dissertation by the first author at Colorado State University. The research was supported by the Office of Science (BER), U.S. Department of Energy, Grant DE-FC02-06ER64302. The first author would like to thank Dr. Celal Konor for his help and encouragement during the development of the model. We wish to thank the reviewers for their valuable comments, which helped improve the paper.
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