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

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Computer simulations of one-dimensional coupled map lattices

100%

Boldrighini C. , Cosimi G. , Frigio S. , Pellegrinotti A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

1998

tom Vol. 2, No 1

5-17

We perform computer simulations of some one-dimensional models of coupled map lattices (CML) with symmetry and diffusive nearest neighbour coupling, to study Ising-type transitions. Such transitions appear to be related to the presence of a dip (minimum) in the plot of the Lyapunov dimension versus coupling parameter.

Length distribution of fuzzy-end segments

88%

Frigio S. , Cosimi G. , Bergmański G. , Urbańska-Galewska E. , Rybicki J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2006

tom Vol. 10, No 3

291-309

We have calculated and discussed the probability density distributions of lengths of fuzzy-end segments, i. e. segments the ends of which assume random positions. We per-formed our calculations for several simple cases in 1, 2 and 3 dimensions: one end fixed, the other assuming a random position, and both ends at random positions. The obtained statistical data may serve as reference data for calculations of stochastic-geometrical properties of complex systems, such as conformations of complicated bolted construc-tions with clearances (in structure mechanics) or energy transfer processes between molecules in diluted systems (in physics).

The structure of rarefied and densified PbSiO3 glass: a molecular dynamics study

63%

Bergmański G. , Białoskórski M. , Rychcik-Leyk M. , Witkowska A. , Rybicki J. , Mancini G. , Frigio S. , Feliziani S.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2004

tom Vol. 8, No 3

393-412

The paper is a molecular dynamics (MD) study of the structure of rarefied and densified lead-silicate glass of the PbSiO3 composition. Simulations have been performed in the constant volume regime for systems with densities of 3000, 4000, 5000, 5970 (normal density), 7000 and 8000kg/m3, using a two-body potential (Born-Mayer repulsive forces and Coulomb forces due to full ionic charges). All the systems were initially prepared as well equilibrated hot melts, and then slowly cooled down to 300K. The information on short-range correlations was obtained in a conventional way (from radial and angular distribution functions), while the middle-range order was studied via cation-anion ring analysis, using our new programme for basal ring determination. The structure of rarefied and densified glasses is compared with the structure of the same glasses under normal conditions. Moreover, the present results on PbSiO3 glass are compared with the corresponding data previously obtained for rarefied and densified PbGeO3 glass (Rybicki et al. 2001 Comput. Met. Sci. Technol. 7 91-112).