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Carbon nanotubes (CNTs) are at the forefront of current research in nanoelectronics. At the present many questions still exist regarding the transport properties of these materials. The mobility of long (/spl sim/325 /spl mu/m) single-walled carbon nanotubes (SWCNTs) agrees very well with semiclassical transport simulations involving inelastic phonon scattering. Such a transport model is likely to be valid when the tube length is longer than the momentum relaxation length (L/sub m/), but may give insights into the electronic and phonon properties of nanotubes of all lengths. One may investigate the dependence of L/sub m/, or other important transport properties such as the phonon-limited mobility, on the tube diameter, on surrounding fields, and on the temperature. Monte Carlo simulations require models for the electron and phonon energy as a function of wavevector. The wavevector space of a nanotube is discretized into a large number of 1-D zones, each corresponding to a single electron subband or a single phonon subbranch.