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- A. Jurlewicz, P. Kern, Mark M. Meerschaert, Hans-Peter Scheffler
- Computers & Mathematics with Applications
- 2012

Keywords: Fractional calculus Anomalous diffusion Continuous time random walk Central limit theory Operator stable law a b s t r a c t In a continuous time random walk (CTRW), a random waiting time precedes each random jump. The CTRW is coupled if the waiting time and the subsequent jump are dependent random variables. The CTRW is used in physics to model… (More)

- Karina Weron, Agnieszka Jurlewicz, Marcin Magdziarz, Aleksander Weron, Justyna Trzmiel
- Physical review. E, Statistical, nonlinear, and…
- 2010

In this paper, we propose a transparent subordination approach to anomalous diffusion processes underlying the nonexponential relaxation. We investigate properties of a coupled continuous-time random walk that follows from modeling the occurrence of jumps with compound counting processes. As a result, two different diffusion processes corresponding to over-… (More)

- Agnieszka Jurlewicz, Karina Weron, Marek Teuerle
- Physical review. E, Statistical, nonlinear, and…
- 2008

A stochastic generalization of renormalization-group transformation for continuous-time random walk processes is proposed. The renormalization consists in replacing the jump events from a randomly sized cluster by a single renormalized (i.e., overall) jump. The clustering of the jumps, followed by the corresponding transformation of the interjump time… (More)

- Karina Weron, Aleksander Stanislavsky, Agnieszka Jurlewicz, Mark M Meerschaert, Hans-Peter Scheffler
- Proceedings. Mathematical, physical, and…
- 2012

We present a class of continuous-time random walks (CTRWs), in which random jumps are separated by random waiting times. The novel feature of these CTRWs is that the jumps are clustered. This introduces a coupled effect, with longer waiting times separating larger jump clusters. We show that the CTRW scaling limits are time-changed processes. Their… (More)

- Andrew K. Jonscher, Agnieszka Jurlewicz, Hugo Steinhaus, Karina Weron
- 2002

Unlike the classical exponential relaxation law, the widely prevailing universal law with its fractional power-law dependence of susceptibility on frequency cannot be explained in the framework of any intuitively simple physical concept. The resulting constancy of the ratio of the imaginary to the real parts of the complex susceptibility, known as the "… (More)

- Justyna Trzmiel, Karina Weron, Aleksander Stanislavsky, Agnieszka Jurlewicz
- Physical review. E, Statistical, nonlinear, and…
- 2011

We present dielectric spectroscopy data obtained for gallium-doped Cd(0.99)Mn(0.01)Te:Ga mixed crystals, which exhibit a very special case of the two-power-law relaxation pattern with the high-frequency power-law exponent equal to 1. We explain this behavior, which cannot be fitted by any of the well-known empirical relaxation functions, in a subordinated… (More)

- Justyna Trzmiel, Agnieszka Jurlewicz, Karina Weron
- Journal of physics. Condensed matter : an…
- 2010

In this paper the complex dielectric permittivity of gallium doped Cd(0.99)Mn(0.01)Te mixed crystals is studied at different temperatures. We observe a two-power-law relaxation pattern with m and n, the low- and high-frequency power-law exponents respectively, satisfying the relation m < 1-n. To interpret the empirical result we propose a correlated-cluster… (More)

- Ewa Gudowska-Nowak, Kinga Bochenek, Agnieszka Jurlewicz, Karina Weron
- Physical review. E, Statistical, nonlinear, and…
- 2005

Charge transport processes in disordered complex media are accompanied by anomalously slow relaxation for which usually a broad distribution of relaxation times is adopted. To account for those properties of the environment, a standard kinetic approach in description of the system is addressed either in the framework of continuous-time random walks (CTRWs)… (More)

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