Abstract:First and foremost, I extend my most sincere thanks to my wife, Maria Olanda Bata, and to my daughters Silvia, Jessie Kay, and Nicole, for bearing with me during this very long pursuit of knowledge. I would like to thank to the University Eduardo Mondlane (Mozambique) for sponsoring me during four of my study years.In addition, I would like to thank Dr. Ken Quesenberry, chair of my supervisory committee, for his support, guidance, and friendship. To the remaining members of my committee Dr.
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