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Wyszukujesz frazę "Cieślak, J." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Simultaneous Analysis of Several Mössbauer Spectra
    Autorzy:
    Cieslak, J.
    Dubiel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811902.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    07.05.Kf
    02.60.-x
    Opis:
    A method based on a simultaneous fit of several Mössbauer spectra from a series of measurements is compared with the one based on an independent analysis of each spectrum. Three different algorithms, namely a least squares iteration procedure, a Gauss-Seidel function minimization and a genetic algorithm based method are applied and discussed. The conclusions drawn are supported by a simulated and a measured spectra analysis.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1691-1705
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Quadrupole Interaction on $\text{}^{57}$Fe Mössbauer Spectra for Samples with Charge- and Spin-Density Waves
    Autorzy:
    Cieślak, J.
    Dubiel, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964225.pdf
    Data publikacji:
    1997-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.30.Fv
    75.50.Ee
    Opis:
    The influence of the quadrupole interaction on the shape of $\text{}^{57}$Fe Mössbauer spectra expected for samples with charge-density waves andor spindensity waves is investigated. It is shown, by model calculations, that both for the commensurate and for incommensurate charge-density waves andor spin-density waves the shape of $\text{}^{57}$Fe Mössbauer spectra is sensitive to the value, and for asymmetric spectra, to the sign of quadrupole interaction. This necessitates an inclusion of quadrupole interaction when analyzing the spectra recorded on samples exhibiting charge-density waves andor spin-density waves, and having a symmetry lower than cubic.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 6; 1131-1139
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Effect of Spin-Density Wave Parameters on Shape of $\text{}^{119}$Sn Mössbauer Spectra
    Autorzy:
    Cieślak, J.
    Dubiel, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943948.pdf
    Data publikacji:
    1995-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.30.Fv
    75.50.Ee
    Opis:
    Based on a simple numerical procedure the influence of various parameters characteristic of spin-density waves on the shape of $\text{}^{119}$Sn Mössbauer spectra and the related histograms of the Hyperfine field distributions is investigated.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 6; 1143-1150
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer-Effect Study of Calciomagnetites
    Autorzy:
    Dubiel, S. M.
    Cieślak, J.
    Orewczyk, J.
    Jasieńska, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968864.pdf
    Data publikacji:
    1998-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    82.80.Ej
    Opis:
    Ca$\text{}_{x}$Fe$\text{}_{3-x}$O$\text{}_{4}$ samples, with x ≤ 0.28 , prepared from α-Fe$\text{}_{2}$O$\text{}_{3}$ and CaO by the Bridgman method were investigated by means of $\text{}^{57}$Fe Mössbauer spectroscopy. Room temperature spectra gave evidence that the samples were multiphase, the calciomagnetite being the dominant phase with a contribution of 73% to 99%, depending on the sample. Analysis of the subspectra associated with the calciomagnetite gave evidence that Ca-ions reside on the tetrahedral (A) sites and have not random distribution. Their presence on those sites causes a reduction of the hyperfine field at Fe nuclei occupying the octahedral positions (B) by 12.3(1.0) kOe per one Ca-ion and a decrease in the average hf field, 〈H$\text{}_{B}$〉/dx, at the rate of 29 kOe/mol% for x ≤ 0.07 and of 387 kOe/mol% for larger x. In addition, a linear correlation between 〈H$\text{}_{B}$〉 and the average isomer shift, 〈I$\text{}_{B}$〉, was revealed to hold. It indicates that addition of Ca-ions into the magnetite causes a decrease in the spin-density and an increase in the charge-density at Fe nuclei occupying the B-sites.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 3; 547-561
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entropy Change Calculations for Pure Gd and a Ni-Mn-Cu-Ga Heusler Alloy: Constant Field vs. Constant Temperature Experiment
    Autorzy:
    Ferenc, J.
    Kowalczyk, M.
    Wróblewski, R.
    Cieślak, G.
    Sielicki, K.
    Leonowicz, M.
    Kulik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402338.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    65.40.gd
    Opis:
    The magnetocaloric effect may be assessed indirectly by expressing it as the change in magnetic entropy in varying magnetic field, H, as the function of temperature, T. Magnetization, M=f(T,H), may be experimentally acquired from a series of isothermal measurements with variable field, or from a series of constant field measurements with variable temperature. The accuracy of magnetic entropy calculation depends on the number of series in these experiments. The aim of this work is to determine how little data is sufficient to obtain accurate results of magnetic entropy change calculations, on the basis of real, magnetocaloric materials. Pure gadolinium and a Ni-Mn-Cu-Ga Heusler alloy were studied. For both materials, the magnetic entropy change and relative cooling power were calculated from both experiments, with the decreasing number of experimental data. For both materials, the constant field experiment with only 6 field values provided only a 5% error of calculations, as compared to the experiment with 100 field values. The Arrott plots were also drawn for constant field mode with 6 field values, easily indicating the order of transition. Comparison of the calculation results suggests that the constant field mode magnetization measurement may be more accurate and faster than isothermal mode.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 111-115
    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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