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    Wyświetlanie 1-5 z 5
    Tytuł:
    Radiation Absorption Characteristics of Titanium Alloys
    Autorzy:
    Stankovic, S.
    Ilic, R.
    Davidovic, D.
    Petrovic, M.
    Tadic, S.
    Kovacevic, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808063.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Ap
    Opis:
    Titanium alloys have found numerous applications in space research, and nuclear industry and research. Since X-rays constitute an important part of the space radiation environment, numerical simulations of radiation absorption characteristics of titanium alloys were studied in this paper. The photon transport Monte Carlo software was used for determining the energy deposited in titanium samples. The numerical results show the pronounced dependence of radiation absorption properties of different combinations of components in alloy. The results obtained are encouraging in respect of optimization of structure of alloys regarding their required features in radiation shielding.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 820-822
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Impact Resistance Properties of Concrete Using Radial Basis Function Networks
    Autorzy:
    Yazici, S.
    Inan Sezer, G.
    Sezer, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031254.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.70.Bt
    79.20.Ap
    07.05.Mh
    Opis:
    This study presents an investigation of the prediction of impact resistance of steel-fiber-reinforced concrete and ordinary concrete specimens. In the experimental part of this study, parameters identifying impact resistance of various concrete mixtures were determined using an impact test machine, in accordance with ACI Committee 544. For this aim, concrete specimens containing three different aggregates (basalt, limestone and natural aggregate) were cured in water at 20°C for 28 days. After curing impact resistance tests were performed on specimens having compressive strength values between 20 and 50 MPa, to determine the blows to initial crack and failure. The specimens were also subjected to splitting tensile strength and ultrasonic pulse velocity tests. Initially, using blows to initial crack and failure, many attempts were made to classify the impact resistance of different types of concrete in terms of the origin of used aggregate, strength properties or ultrasonic pulse velocity, however, this made no sense. The specimens could only be classified in terms of steel fiber presence. Therefore, radial basis function network, which belongs to another kind of unsupervised classifier network, was used to estimate the two above-mentioned impact resistance parameters. In this scope, independent from aggregate origin used in preparation of specimens, compressive strength, splitting tensile strength and ultrasonic pulse velocity of the specimens were used to predict the impact resistance parameters of the concrete specimens. The results revealed that three listed parameters can be used for estimation of blows to formation of initial crack and failure. Scatter plots, root mean square error and absolute value of average residual parameters were used to verify the errors in predictions, which were very low, compared with the uncertainty in test and ambiguity of data in hand.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1036-1040
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic States of $UNi_2$ from Photoemission Spectroscopy
    Autorzy:
    Zalecki, R.
    Kołodziejczyk, A.
    Kim-Ngan, N.
    Adamska, A.
    Kowalczyk, A.
    Toliński, T.
    Mihalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813761.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    79.60.Bm
    71.15.Ap
    Opis:
    We measured the angle-resolved ultraviolet and X-ray photoemission spectra of $UNi_2$ single crystal. The valence band angle-resolved ultraviolet photoemission spectra were compared to the accessible band structure calculations. For $UNi_2$ the lowest binding energy strong emission at about -0.1 eV comes from U 5f states and overlaps with the Fermi edge. A small feature at -0.6 eV was ascribed also to U 5f electrons with more localised character. The higher-energy two-peak structure at about -1.2 eV and -2.1 eV comes from Ni 3d states. X-ray photoemission spectroscopy shows the standard two-line spin-orbit splitting of the Ni 2p states and of the U 4f states. Some hybridisation of the Ni 3d and U 5f state was observed in the spectra. The pronounced satellites to the Ni 2p and 3p states, associated with the on-site Coulomb repulsion and other electron correlation energies, were observed.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 407-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Electronic States of (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$
    Autorzy:
    Penc, B.
    Zalecki, R.
    Jezierski, A.
    Szytuła, A.
    Kołodziejczyk, A.
    Ivanov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043378.pdf
    Data publikacji:
    2005-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Gj
    71.15.Ap
    Opis:
    The core-level and valence band electronic states studies of single crystalline transition metal silicides (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$ (x=0 and 0.05) by the X-ray and ultraviolet photoemission spectroscopies are reported. The Mn 2p core-level spectra for both compounds were ascribed to the relevant Mn sites in their crystal structure. The valence band spectra were compared with the result of ab-initio band calculations using the tight-binding linear muffin-tin orbital method. It was concluded that the enhancement of the spectral density within the 2 eV binding energy region below the Fermi energy comes from the effect of strongly correlated Mn 3d electrons.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 6; 967-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic States of Collosal Magnetoresistive Manganites $La_{0.67}Pb_{0.33}Mn_{1-x}Fe_{x}O_{3}$ from Photoemission Spectroscopy
    Autorzy:
    Kowalik, M.
    Zalecki, R.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538821.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    79.60.Bm
    71.15.Ap
    74.20.Mn
    Opis:
    The electron photoemission spectra of valence bands and core-level states of manganese perovskite $La_{0.67}Pb_{0.33}(Mn_{1-x}Fe_{x})O_{3}$ with x = 0, 0.01, 0.03, 0.06, 0.10 and 0.15 were measured by the X-ray and Ultraviolet Photoemission Spectroscopy (XPS and UPS) below and above the metal-insulator transition. From analysis of the Mn 2p core-level spectra the ratio $Mn^{3+}//Mn^{4+}$ was calculated as a function of the iron content. Comparison of the valence band spectrum with band structure calculations and with the high-resolution spectra measured at synchrotron radiation for Ca-, Ba- and Ce- substituted manganites revealed the strong hybridisation of Mn 3d and of O 2p states between -3 eV and -7 eV, and no estimated oxygen states between 0 eV and -2 eV where the Mn-3d states play a predominant role. The composition dependent insulating energy gaps were measured at room temperature. Reasons for the behaviour were discussed taking into account previous analysis of XPS/UPS spectra of other manganese perovskites.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 277-280
    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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