  The available data of single X-ray pulsars, their wind nebulae, and the SNRs
which are connected to some of these sources are analysed. It is shown that
electric field intensity of neutron stars tears off charged particles from the
surface of neutron star and triggers the acceleration of particles. The charged
particles are accelerated mainly in the field of magnetodipole radiation wave.
Power and energy spectra of the charged particles depend on the strength of the
magnetodipole radiation. Therefore, the X-ray radiation is strongly dependent
on the rate of rotational energy loss and weakly dependent on the electric
field intensity. Coulomb interaction between the charged particles is the main
factor for the energy loss and the X-ray spectra of the charged particles.
