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Content available remote

Rectification of Brownian Particles with Oscillating Radii in Asymmetric Corrugated Channels

100%
Glavey R., Savel'ev S.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2
159-162
EN
Transport of a Brownian particle with an oscillating radius freely diffusing in an asymmetric corrugated channel was simulated over a range of driving forces for a series of temperatures and angular frequencies of radial oscillation. It was observed that there was a strong influence of self-oscillation frequency on the average particle velocity. This effect can be used to control rectification of biologically active particles as well as for their separation according to their activity, for instance in the separation of living and dead cells.
2
Content available remote

Recurrence Quantification Analysis of Lorenz Model Periodically Modulated at the Onset of Chaos

80%
Babinec P., Krafčík A.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 3
368-370
EN
Plots and quantitative measures obtained from recurrence quantification analysis - recurrence rate, determinism, entropy, and trapping time, were used for the sensitive detection of transitions from laminar (regular) to turbulent (chaotic) phases in the Lorenz model periodically modulated at the onset of chaos.
3
Content available remote

The Mathematics of Human Contact: Developing a Model for Social Interaction in School Children

80%
Ashton S., Scalas E., Georgiou N., Kiss I.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 6
1421-1432
EN
In this paper, we provide a statistical analysis of high-resolution contact pattern data within primary and secondary schools as collected by the SocioPatterns collaboration. Students are graphically represented as nodes in a temporally evolving network, in which links represent proximity or interaction between students. This article focuses on link- and node-level statistics, such as the on- and off-durations of links as well as the activity potential of nodes and links. Parametric models are fitted to the on- and off-durations of links, inter-event times and node activity potentials and, based on these, we propose a number of theoretical models that are able to reproduce the collected data within varying levels of accuracy. By doing so, we aim to identify the minimal network-level properties that are needed to closely match the real-world data, with the aim of combining this contact pattern model with epidemic models in future work.
4
Content available remote

Fano Factor of Chromosome Aberrations and Asessment of Repair Efficiency

80%
Kowalska A., Pereira W., Czerski K.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 2
225-227
EN
A new statistical method to study repair mechanism of individual cells exposed to ionizing radiation is presented. The method is based on deviations from the Poisson distribution of observed chromosome aberrations and allows to determine the efficiency of repair mechanisms of individual cells. On basis of the dose-effect curves and the chi-square analysis, the ratio between the variance and the mean value of the observed aberration distribution could be calculated and related to the efficiency of the cellular repair mechanisms. The method has been tested on human lymphocytes and CHO-K1 cells exposed to different radiation species. In the case of high-linear energy transfer ion irradiation a correction due to Neyman A statistics has been introduced.
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