http://dspace.nbuv.gov.ua:80/handle/123456789/32035 2026-04-06T11:09:13Z 2026-04-06T11:09:13Z Belonoshko, A.B. http://dspace.nbuv.gov.ua:80/handle/123456789/32102 2012-04-09T09:21:15Z 2010-01-01T00:00:00Z

Equation of state for ε-iron at high pressures and temperatures Belonoshko, A.B. Computations were performed using the facilities at the Swedish National Infrastructure for Computing (SNIC). Financial support from the Swedish Research Council (VR) is gratefully acknowledged.

2010-01-01T00:00:00Z Artyomov, M.N. Morozov, A.Yu. Kolomeisky, A.B. http://dspace.nbuv.gov.ua:80/handle/123456789/32101 2012-04-09T09:19:33Z 2010-01-01T00:00:00Z

Dynamics of molecular motors in reversible burnt-bridge models Artyomov, M.N.; Morozov, A.Yu.; Kolomeisky, A.B. Dynamic properties of molecular motors whose motion is powered by interactions with specific lattice bonds are studied theoretically with the help of discrete-state stochastic "burnt-bridge" models. Molecular motors are depicted as random walkers that can destroy or rebuild periodically distributed weak connections ("bridges") when crossing them, with probabilities p1 and p2 correspondingly. Dynamic properties, such as velocities and dispersions, are obtained in exact and explicit form for arbitrary values of parameters p1 and p2. For the unbiased random walker, reversible burning of the bridges results in a biased directed motion with a dynamic transition observed at very small concentrations of bridges. In the case of backward biased molecular motor its backward velocity is reduced and a reversal of the direction of motion is observed for some range of parameters. It is also found that the dispersion demonstrates a complex, non-monotonic behavior with large fluctuations for some set of parameters. Complex dynamics of the system is discussed by analyzing the behavior of the molecular motors near burned bridges.

2010-01-01T00:00:00Z Bogolubov (jr.), N.N. Prykarpatsky, Ya.A. Ghazaryan, A.A. http://dspace.nbuv.gov.ua:80/handle/123456789/32100 2012-04-09T09:20:42Z 2010-01-01T00:00:00Z

The Bogolubov representation of the polaron model and its completely integrable RPA-approximation Bogolubov (jr.), N.N.; Prykarpatsky, Ya.A.; Ghazaryan, A.A. The polaron model in ionic crystal is studied in the Bogolubov representation using a special RPA-approximation. A new exactly solvable approximated polaron model is derived and described in detail. Its free energy at finite temperature is calculated analytically. The polaron free energy in the constant magnetic field at finite temperature is also discussed. Based on the structure of the Bogolubov unitary transformed polaron Hamiltonian there is stated a very important new result: the full polaron model is exactly solvable.; Досліджено модель полярона в іонному кристалі в представленні Боголюбова, використовуючи особливе наближення хаотичних фаз. Виведено та описано нову точно розв'язну наближену модель полярона. Аналітично одержано вільну енергію такої моделі за ненульової температури. Розглянуто вільну енергію полярона в постійному магнітному полі за ненульової температури. На базі унітарного перетворення Боголюбова для поляронного гамільтоніана одержано важливий новий результат: повна модель полярона є точно розв'язною.

2010-01-01T00:00:00Z Antonov, V.N. Shpak, A.P. Bekenov, L.V. Germash, L.P. Yaresko, A.N. http://dspace.nbuv.gov.ua:80/handle/123456789/32099 2012-04-09T09:20:09Z 2010-01-01T00:00:00Z

Electronic structure and x-ray magnetic circular dichroism in (Ge,Mn)Te diluted magnetic semiconductors Antonov, V.N.; Shpak, A.P.; Bekenov, L.V.; Germash, L.P.; Yaresko, A.N. The electronic structure of the (Ge,Mn)Te diluted magnetic semiconductors was investigated theoretically from first principles, using the fully relativistic Dirac linear muffin-tin orbital (LMTO) band structure method. The electronic structure is obtained with the local spin-density approximation (LSDA) as well as the LSDA+U method. The x-ray magnetic circular dichroism (XMCD) spectra of (Ge,Mn)Te DMSs at the Mn L2,3 edges are investigated theoretically from first principles. The origin of the XMCD spectra in the compound is examined. The calculated results are compared with available experimental data.

2010-01-01T00:00:00Z