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Wyszukujesz frazę "Kruk, A." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Metrology and 3D Imaging of Microstructural Elements in Materials for Environmentally Friendly Power Plants
    Autorzy:
    Kruk, A.
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032951.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.90.+v
    87.64.Ee
    81.05.Bx
    Opis:
    The aim of this study was the application of tomographic techniques (focused ion beam-scanning electron microscopy, scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy) to qualitative and quantitative characterization of structural elements in T/P92 creep resistant 9% Cr steel, Allvac 718Plus Ni-based superalloy and W-based alloy - multiphase materials for environmentally friendly power plants exposed to extreme operational conditions. The study showed that tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their spatial distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative transmission electron microscopy and scanning electron microscopy metallography.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1311-1314
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Visualization of the Interface between Cell and Ceramic Coating by Electron Microscopy and Tomography Techniques
    Autorzy:
    Karbowniczek, J.
    Gruszczyński, A.
    Kruk, A.
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032976.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    81.65.Mq
    87.17.Rt
    87.85.J-
    Opis:
    To improve the stability of bone-material connection various surface modifications are applied to titanium based implants. Such new biomaterials require detailed characterization, including their biocompatibility. In the present study focused ion beam-scanning electron microscope tomography was applied to investigate the internal structure of ceramic coating as well as cell-material interface. Focused ion beam-scanning electron microscope tomography involves repeated focused ion beam milling and subsequent scanning electron microscope imaging of exposed sample surface and is followed by 3D reconstruction. This approach enables receiving additional information about the sample, unavailable at 2D images. The qualitative and quantitative investigation of pores in the ceramic coating was performed. The porosity of investigated volume: 8.5× 1.1× 3.9 μm³ was calculated as 24%. Additionally, based on 3D reconstruction the visualization of the coherent interface between cell and ceramic coating was done.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1357-1360
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NMR Relaxation and ESR Lineshape of Anisotropically Rotating Paramagnetic Molecules
    Autorzy:
    Kubica, A.
    Milewska, A.
    Noinska, M.
    Earle, K.
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490224.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kj
    87.64.kh
    75.10.Dg
    76.60.Es
    Opis:
    The role of anisotropic rotation for electron spin resonance lineshape and nuclear magnetic relaxation dispersion profiles for paramagnetic molecules with electron spin quantum number S ≥ 1 is discussed. The ESR spectra and nuclear magnetic relaxation dispersion profiles are calculated by means of an approach based on the stochastic Liouville equation and referred to in the literature as "Swedish slow motion theory". This description is valid for arbitrary motional conditions and interaction strengths. Molecular tumbling influences the ESR spectra by modulating zero field splitting interactions. The nuclear spin relaxation is affected by the rotational motion in a twofold way: via the electron spin dynamics and as a direct source of modulations of the electron-nuclear dipole-dipole interactions. For coinciding principal axes systems of the permanent (residual, static) zero field splitting and rotational tensors the ESR lineshape is not affected by rotational anisotropy. Rotational anisotropy is important for nuclear relaxation as it is influenced by molecular rotation not only via the electron spin dynamics, but also directly by modulations of the electron spin-nuclear spin dipole-dipole interaction (when the dipole-dipole and zero field splitting frames do not coincide). The anisotropy effects depend strongly on the relative orientation of the dipole-dipole and permanent zero field splitting axes. Nevertheless, a different scenario is also possible. When the diffusion axis coincides with the dipole-dipole axis (but not with the principal axis system of the permanent zero field splitting), the nuclear spin relaxation as well as the ESR lineshape, become sensitive to the rotational anisotropy. The possible dependence of the ESR lineshape and nuclear spin relaxation on the rotational anisotropy should be carefully considered when attempting a joint analysis of ESR and nuclear magnetic relaxation dispersion results for paramagnetic molecules.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 527-532
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example
    Autorzy:
    Skowronska, A.
    Wojciechowski, M.
    Ramos, P.
    Pilawa, B.
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490205.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.La
    87.64.kj
    87.64.kh
    75.10.Dg
    Opis:
    Electron spin resonance (ESR) studies of two antibiotics, Cefaclor and Clarithromycin, have been performed in order to investigate concentration and dynamics of free radicals generated in these compounds due to thermal sterilization. For Cefaclor three combinations of temperature and heating time have been applied: 160°C, 170°C, 180°C for 120 min, 60 min, and 30 min, respectively, according to the pharmaceutical sterilization norm. Clarithromycin has been heated at 160°C for 120 min. The ESR lineshape has been investigated versus microwave power ranging from 2.2 mW to 70 mW. Electron spin-spin relaxation time has been estimated from the ESR lineshape analysis. Concentrations of radicals generated due to different sterilization procedures have been compared with the purpose to select the best sterilization scheme.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 514-517
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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