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Wyszukujesz frazę "Feliziani, S." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Model angular distribution functions in CA3, CA4 and CA6 structural units of glassy systems
Autorzy:
Bergmański, G.
Feliziani, S.
Rybicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933172.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
structure of matter
disordered systems
short-range order
stochastic geometry
Opis:
We have calculated model partial angular distribution functions (pADFs) in CA3, CA4 and CA6 structural units, i. e. an equilateral triangle with three vertical anions, A, and a central cation, C, a regular tetrahedron with four vertical anions, A, and a central cation, C and a square bipyramid with six vertical anions, A, and a central cation, C. The model pADFs were calculated employing a simple Monte Carlo procedure: the ions were being shifted at random within 3D spheres of radius r with uniform probability density and the AAA, ACA and CAA angles were calculated for each random configuration. Repeating the calculation 10(8) - 10(9) times produced smooth probability densities for the angles' values. Conventional reference data so obtained can be applied to estimate the overall degree of deformation of the considered structural units in numerically simulated materials.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 185-195
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure of Pb-PbO-SiO2 glass via molecular dynamics simulation
Autorzy:
Rybicki, J.
Witkowska, A.
Bergmański, G.
Mancini, G.
Feliziani, S.
Powiązania:
https://bibliotekanauki.pl/articles/1954650.pdf
Data publikacji:
2022-01-20
Wydawca:
Politechnika Gdańska
Tematy:
lead-silicate glasses
oxide glasses
medium-range order
ring analysis
molecular dynamics simulations
Opis:
The paper is dedicated to a molecular dynamics (MD) study of the structure of partially reduced lead-silicate glass of composition 1Pb 1PbO 1SiO2. The simulations have been performed in the constant volume regime, using a two-body potential (Born-Mayer repulsive forces, and Coulomb forces due to full ionic charges). The system was initially prepared as a well equilibrated hot melt, and then slowly cooled down to 300K. The information on short-range correlations were obtained in a conventional way (from pair and angular distribution functions), while the medium-range order was studied via cation-anion ring analysis. In the paper, the short- and medium-range order in the simulated system is discussed and compared with the structure of a glassy completely reduced system, i.e. 2Pb 1SiO2 and unreduced one, i.e. 2PbO 1SiO2 glass.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 243-256
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure of rarefied and densified PbSiO3 glass: a molecular dynamics study
Autorzy:
Bergmański, G.
Białoskórski, M.
Rychcik-Leyk, M.
Witkowska, A.
Rybicki, J.
Mancini, G.
Frigio, S.
Feliziani, S.
Powiązania:
https://bibliotekanauki.pl/articles/1954073.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
oxide glasses
structure of glasses
ring analysis
MD simulations
Opis:
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).
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 3; 393-412
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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