The general purpose of this paper is to develop a linear response formalism for stochastic multiperiodic systems; these systems being obtained by letting some stochastic perturbation act on deterministic multiperiodic systems. Such a formalism is then applied to the absorption coefficient of the...

Recently it has been proposed a modification of the Wigner function which consists in smoothing it by convolution with a phase-space gaussian function; this smoothed Wigner function is non-negative if the gaussian parameters Δ and δ satisfy the condition Δδ ⩾ ħ. We analyze in this paper...

We present and discuss the padé z-transform method for the identification of a transfer function model; an application is given with the geometric lag model, the ratios of which can be real and/or complex numbers. The method consists first in considering the z-transform of the transfer function...