J. Spiechowicz

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We study diffusion in ratchet systems. As a particular experimental realization we consider an asymmetric SQUID subjected to an external ac current and a constant magnetic flux. We analyze mean-square displacement of the Josephson phase and find that within selected parameter regimes it evolves in three distinct stages: initially as superdiffusion, next as(More)
Jakub Spiechowicz,1 Peter Hänggi,2,3 and Jerzy Łuczka1,4 1Institute of Physics, University of Silesia, 40-007 Katowice, Poland 2Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany 3Nanosystems Initiative Munich, Schellingstrasse 4, D-80799 München, Germany 4Silesian Center for Education and Interdisciplinary Research, University of(More)
We study diffusion of the Josephson phase in the asymmetric superconducting quantum interference device (SQUID) subjected to a time-periodic current and pierced by an external magnetic flux. We analyze a relation between phase diffusion and quality of transport characterized by the dc voltage across the SQUID and efficiency of the device. In doing so, we(More)
We study a noisy drive mechanism for efficiency enhancement of Brownian motors operating on the microscale domain. It was proven [J. Spiechowicz et al., J. Stat. Mech. (2013) P02044] that biased noise η(t) can induce normal and anomalous transport processes similar to those generated by a static force F acting on inertial Brownian particles in a(More)
Calprotectin (L1) is a major leukocyte protein which is released during activation or death of neutrophil granulocytes and monocytes. Previous studies have shown that L1 may be a useful marker of disease activity in patients with adult or juvenile rheumatoid arthritis (RA). In the present study, the plasma concentrations of L1 were analysed during(More)