Intensity fluctuations under diffusion mechanism of radiation of charged particles are considered in this paper. The variances of integrated intensities are calculated. It is shown that they are small compared with the corresponding average quantities. Fluctuations of spectral-angular intensity...

We discuss the problem of the dynamic dielectric and magnetic response on the whole frequency range of a composite material. We derive exact one-body expressions of the momentum-dependent mean constitutive kernels, for an assembly of dielectric and magnetic spheres of finite size, on the basis...

The a.c. electric field distribution is studied in composite, containing materials with small local losses. The possibility that a 2D two-component system can have effective absorption in the absence of local absorption was evidenced (A.M. Dykhne, Zh. Eksp. Teor. Fiz. 59 (1970) 110). We study...

We present the stochastic differential equation with quenched noise for the Tang and Leschhorn model (Phys. Rev. A 45 (1992) R8309). The equation derived from the microscopic rules using regularization procedure predicts accurately the roughness, the dynamical and velocity exponents of the...

The analytical continuous equations for the Tang and Leschhorn (Phys. Rev. A 45 (1992) R8309) and the Buldyrev et al. (Phys. Rev. A 45 (1992) R8313) models are derived from the microscopic rules using a regularization procedure. As was shown in a previous paper (Phys. Rev. E 62 (2000) 6970) the...

We present the microscopic equation of growing interface with quenched noise for the Tang and Leschhorn model (Phys. Rev. A 45(1992) R8309). The evolution equations for the mean height and the roughness are reached in a simple way. Also, an equation for the interface activity density (i.e....

Consider a set of N cities randomly distributed in the bulk of a hypercube with d dimensions. A walker, with memory μ, begins his route from a given city of this map and moves, at each discrete time step, to the nearest point, which has not been visited in the preceding μ steps. After...

Findings from previous studies indicate that the long-run stationarity of the real exchange rate in different time horizons remains unclear. In order to shed light on this problem, we have adopted a new method which is widely used to analyze signals, the so-called wavelet transformation. This...

Findings from previous studies indicate that the long-run stationarity of the real exchange rate in different time horizons remains unclear. In order to shed light on this problem, we have adopted a new method which is widely used to analyze signals, the so-called wavelet transformation. This...