Starting from the kinetic equation in the K space, which is the Fourier space of velocity V and using the technique of operator calculation and transformation, the re-normalized dispersion equation of turbulent plasma has been deriv ed rather simply. The effect of finite correlation time of the turbulence has been calculated under the approximation of assuming a turbulence with effective correlation time τeff instead of the one with time and space correlation. It shows that the effect of finite τeff will reduce the effect of turbulence. Therefore, the expression obtained in the limiting case of short eorrelation time is the upper bound of the turbulence effect. The effects of turbulence on the ion sounds, electron langmuir waves and drift waves have also been discussed.
It is shown that the transport of the plasma immersed in a stochastic magnetic field (s.m.f.) must lead to the producing of an ambipolar electric field. In this paper, the transition probability of charged particels in the s.m.f. was derived in the case of existing a transverse electric field. The transport fluxes and the ambipolar electric field were then calculated. The result shows that the ambipolar electric field is insensitive to the collision between particles. ((|e|E)/Te=-A1/ne(dne)/(dx), A is a coefficient ofabout 1, which depends on collision insensitively.) This ambipolar electric field may be used as a necessary (but not sufficient) criterion of ascertaining whether the effect of s.m.f. on the plasma transport is important. In the transport process induced by s.m.f. the impure ions transport more rapidly than hydrogen ions (VI/Vi≈[mi/mI]1/2ZI>1), this result can be used to explain the phenomenon in Tokamak experiment, i.e., when there appears interior disruption, the impurities will be extracted from centre region instead of being cumulated. We discussed also the effect of collision and the condition under which the above treat-ment is applicable. In the case of high collision, the diffusion flux is a much smaller quantity. The corresponding dynamic equation of plasma in a s.m.f. has been derived, it is somewhat different from that obtained by K. Molvig et al. in [3].
In this paper effects of a new evolutionary rule added to the dynamics of the steepest descending asynchronous network model were studied. By numerical simulations, we found that the neural network operates very efficiently to improve the fault-tolerance when ,its capacity a under the new rule. The simulations were conducted on both the low- and the high-dimensional networks. A modified training scheme is also introduced.
In this paper, the effects of collision on the dispersion equation of plasma are discussed under two kinds of collision models (BGK model and LB model). Analysis shows that the main effect of collision is to change the usual dispersion function Z(ξ) into a generalized one W(ξ,ν). The properties of W function have been analysed and compared for two models. The effects of collision on low frequeny drift wave (local mode) and ion-acoustic wave have been discussed. It is shown that LB model is not only more reasonable physically than BGK model, but also more simple in calculation and expression.
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