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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Pressure Effect on Glass Formation and Cluster Structure Evolution during Cooling Process of PdNi Alloy: A Molecular Dynamics Study
    Autorzy:
    Kazanc, S.
    Celik, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195946.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.pe
    83.10.Rs
    34.20.Cf
    Opis:
    Based on the embedded atom method a molecular dynamics simulation technique has been used to study the glass formation and atomic short range order in Pd-Ni binary alloy. By using radial distribution functions and Honeycutt-Andersen pair analysis methods, the structural development of this alloy is studied by quenching from the liquid at two different cooling rates and under 0 and 5 GPa pressures. The results show that the variation of local atomic bonded pairs is of great importance to understand the glass formation process and increase of the number of the ideal icosahedra under high pressure contributes to more ideal glass formation of model alloy.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 49-53
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)
    Autorzy:
    Palka, G.
    Rzeznik, L.
    Paruch, R.
    Postawa, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400436.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.49.Sf
    82.80.Ms
    83.10.Rs
    79.20.Rf
    Opis:
    Large-scale molecular dynamics computer simulations are used to investigate the dynamics of material ejection during high-energy $Ar_n$ cluster bombardment of Ag(111) at normal incidence. The silver sample containing 7 million atoms is bombarded with $Ar_n$ projectiles (n=45-30000) with kinetic energy spanning from a few keV up to 1 MeV. Such a wide range of projectile parameters allows probing processes taking place during low-density collision cascade as well as during high-density events characteristic of micrometeorite bombardment in space. The material modifications and total sputtering yield of ejected particles are investigated. While at low-energy impacts, ejection of individual silver atoms is the main emission channel, the ejection of large clusters from the corona of the created crater dominates for the high-energy impacts.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 831-833
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sputtering of Benzene Sample by Large Ne, Ar and Kr Clusters - Molecular Dynamics Computer Simulations
    Autorzy:
    Rzeznik, L.
    Paruch, R.
    Garrison, B.
    Postawa, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400433.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.49.Sf
    82.80.Ms
    83.10.Rs
    61.82.Pv
    79.20.Rf
    Opis:
    Molecular dynamics simulations are employed to probe the role of an impact angle on emission efficiency of organic molecules sputtered from benzene crystal bombarded by 15 keV $Ne_{2953}$, $Ar_{2953}$, and $Kr_{2953}$ clusters. It is found that both the cluster type and the angle of incidence have significant effect on the emission efficiency. The shape of the impact angle dependence does not resemble the dependence characteristic for medium size clusters ($C_{60}$, $Ar_{366}$), where sputtering yield only moderately increases with the impact angle, has a shallow maximum around 40° and then decreases. On the contrary, for the large projectiles ($Ne_{2953}$, $Ar_{2953}$, and $Kr_{2953}$) the emission efficiency steeply increases with the impact angle, has a pronounced maximum around 55° followed by rapid signal decay. It has been found that the sputtering yield is the most sensitive to the impact angle change for Kr cluster projectiles, while change of the impact angle of Ne projectile has the smallest effect on the efficiency of material ejection.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 825-827
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying Static, Dynamic and Transport Properties of Mg₃Bi₂
    Autorzy:
    Kayadibi, F.
    Günay, S.
    Taşseven, Ç.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401914.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    83.10.Rs
    34.20.Gj
    66.30.H-
    66.30.Fq
    62.20.-x
    65.40.-b
    Opis:
    In this study, new potential parameters for Mg₃Bi₂ are proposed which is the Born-Mayer-Huggins type potential. Static, dynamic and transport properties are studied for this material from 300 K up to 1600 K with classical molecular dynamics simulation. Mechanical properties; like elastic constants ($C_{11}$, $C_{12}$, $C_{13}$, $C_{33}$, $C_{44}$), bulk modulus and shear modulus are found. All these data are compared with the limited number of experimental and first-principle studies. Our results give a good description of the Mg₃Bi₂ system: lattice constants, α → β transition temperature, melting temperature, diffusion coefficient, density and mechanical properties are promising.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 440-446
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Viscosity of Aluminum Oxide-Ethylene Glycol (Al₂O₃-EG) Nanofluids
    Autorzy:
    Żyła, G.
    Fal, J.
    Gizowska, M.
    Witek, A.
    Cholewa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402591.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    83.10.Pp
    83.50.Ax
    83.60.Fg
    83.60.Rs
    83.80.Hj
    Opis:
    The paper presents the results of measurements of rheological properties of ethylene glycol (EG) based aluminum oxide (Al₂O₃) nanofluids. The nanofluids have been produced by two-step method with the use of commercially available nanoparticles. Dynamic viscosity curves and dependence of viscosity on temperature for these materials have been measured. It has shown that with higher concentration of nanoparticles in the suspension, these nanofluids exhibit the non-Newtonian flow and it can be considered as shear-thinning liquids. The effect of temperature on the dynamic viscosity in Al₂O₃-EG nanofluids can be modelled with the use of Vogel-Fulcher-Tammann expression.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 240-242
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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