1. School of Engineering, Brown University, Providence, RI, USA
2. Nano-electronics Integrated Systems Center, Nile University, Giza 12588, Egypt
3. Radiation Engineering Department, NCRRT, Egyptian Atomic Energy Authority, Cairo 29 SOS, Egypt
4. Engineering Mathematics Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt
5. School of Engineering and Applied Sciences, Nile University, Giza, Egypt