**Acknowledgements**

In the completion of this report, I have received encouragement and support from various quarters, which need special mention.

I wish to acknowledge my indebtedness to Dr. Parnika Shrivastava and Dr. Ramesh Guduru, Pandit Deendayal Petroleum University, Gandhinagar, who guided me throughout this work. And special thanks to Dr. Gülenay Kilic who support me at every step throughout my study, and for extending all possible cooperation.

I am also thankful to all those people of Pandit Deendayal Energy University, Gandhinagar, who helped me directly or indirectly during this period.

Mere acknowledgement may not redeem the debt i owe to my parents for their direct/indirect support during the entire course of this project.
