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2 TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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Heisenberg Analytical-Numerical Model of Nanoparticle with Para- and Ferromagnetism

Leble Sergey, Chychkalo Anastasiia

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2019

Vol. 23, No 3

303--317

Two models of two- and three-layers of a magnetic nanoparticle are presented applying the Heisenberg theory with the parameter (exchange integral and closest neighbors) values for surface layers, which differ from the bulk layer values. The difference in the numbers of closest neighbors is taken into account. The corresponding distribution and partition functions are constructed. The magnetization of the particles is calculated by the conventional transition to thermodynamics. The results are illustrated by plots, representing magnetization curves and hysteresis loops for the layer contributions. The magnetization curves for both models are compared.

Tsunami-driven plane acoustic waves in the atmosphere

Leble Sergey, Smirnona Ekaterina

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2018

Vol. 22, No 3

237--253

A problem of analytical-numerical modeling of the plane wave propagation from an ocean surface to the atmosphere is considered. We are interested in the thermosphere impact of tsunami waves. We suppose that the transport of energy and the momentum from lower atmosphere to thermosphere heights is due to acoustic waves.A set of expressions for the atmosphere variables (pressure, velocity, entropy) as a function of the atmosphere parameters, time and height is derived and illustrated by plots. The surface water wave parameters, typical for tsunami also enter final expressions for the atmosphere and ionosphere variables.