“…Making use of fractional derivatives and integrals, one may describe more accurately a complex system and accordingly investigate more completely its dynamical and physical properties. Although fractional calculus has been studied for over 300 years, it has been regarded principally as a mathematical curiosity until about 1992, where fractional dynamical equations were pretty much restricted to the realm of mathematics and engineering including hydrology, viscoelastivity, heat conduction, polymer physics, chaos and EL-NABULSI Ahmad Rami fractals, control theory, plasma physics, wave propagation in complex and porous media, astrophysics, cosmology, quantum field theory, potential theory and so on (Aghaei et al, 2009;Samko et al, 1993;Miller and Ross, 1993;Podlubny, 1999;Hilfer, 2000;Kluwer, 2004;Ortigueira and Machado, 2006;2008;El-Nabulsi, 2008a;2009a). Actually, there exist numerous different forms of fractional integral and derivatives operators and the definition of the fractional order derivative and integral are not unique where several definitions exist, e.g., Grunwald-Letnikov, Caputo, Weyl, Feller, ErdelyiKober, Riesz, Saxena, Kumbhat, Kiryakova, Srivastava and Raina.…”