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  • Author: Maciej Wołoszyn x
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Seasonal movements of wisents (Bison bonasus L., 1758) in the Bieszczady Mountains (SE Poland)

Abstract

We studied seasonal movements of wisents (also known as European bison) from the western subpopulation in the Bieszczady Mountains, in forest districts of Baligród, Komańcza, Lesko, and Cisna. The estimation of distance of seasonal movements was based on telemetric bearings of 4 adult animals (1 cow and 3 bulls) in 2002‑2005. We assumed that a maximum distance of movement was a linear extent between 2 most distant locations of an animal recorded in winter and in the following growing season. The maximum distances were 12.8‑18.5 km for the cow, and 5.1‑22.9 km for bulls. Wisent movements were triggered by significant changes in ambient temperature (decrease in late autumn and increase in early spring) and the appearance of first snowfall in autumn.

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The Phase–Space Approach to time Evolution of Quantum States in Confined Systems: the Spectral Split–Operator Method

Abstract

Using the phase space approach, we consider the quantum dynamics of a wave packet in an isolated confined system with three different potential energy profiles. We solve the Moyal equation of motion for the Wigner function with the highly efficient spectral split-operator method. The main aim of this study is to compare the accuracy of the employed algorithm through analysis of the total energy expectation value, in terms of deviation from its exact value. This comparison is performed for the second and fourth order factorizations of the time evolution operator.

Open access
The Effect of Elastic and Inelastic Scattering on Electronic Transport in Open Systems

Abstract

The purpose of this study is to apply the distribution function formalism to the problem of electronic transport in open systems, and to numerically solve the kinetic equation with a dissipation term. This term is modeled within the relaxation time approximation and contains two parts, corresponding to elastic or inelastic processes. The collision operator is approximated as a sum of the semi-classical energy dissipation term and the momentum relaxation term, which randomizes the momentum but does not change the energy. As a result, the distribution of charge carriers changes due to the dissipation processes, which has a profound impact on the electronic transport through the simulated region discussed in terms of the current–voltage characteristics and their modification caused by the scattering. Measurements of the current–voltage characteristics for titanium dioxide thin layers are also presented, and compared with the results of numerical calculations.

Open access