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Wyszukujesz frazę "Petrovic, K." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    The occurrence of European mistletoe under the conditions of high human impact in the central part of Warsaw, Poland
    Autorzy:
    Zachwatowicz, M.
    Petrovic, K.
    Sudnik-Wojcikowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/86048.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Asocjacja Ekologii Krajobrazu
    Tematy:
    occurrence
    European mistletoe
    Viscum album ssp.album
    plant distribution
    parasitic plant
    shrub
    human impact
    Warsaw city
    Polska
    mistletoe
    plant species
    biotic factor
    abiotic factor
    taxonomy
    contaminated environment
    host
    Źródło:
    Problemy Ekologii Krajobrazu; 2008, 22
    1899-3850
    Pojawia się w:
    Problemy Ekologii Krajobrazu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Introduction of Copper into Amorphous $As_2Se_3$ Matrix on Its Thermal and Structural Characteristics
    Autorzy:
    Štrbac, G.
    Lukić-Petrović, S.
    Štrbac, D.
    Čajko, K.
    Turyanytsa, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399717.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.kj
    64.70.P-
    65.60.+a
    Opis:
    This paper describes the results of the determination of some thermal and structural parameters of glasses from the $Cu_{x}(As_2Se_3)_{100-x}$ system for x=0, 1, 5, 10 and 15 at.%. Based on the differential scanning calorimetry curves taken at different heating rates, glass transition temperature $T_{g}$, onset temperature of crystallization $T_{onset}$, and melting temperature $T_{m}$ of crystalline units formed are determined. The values of activation energy $E_{g}$ of glass transition process are calculated. These characteristic temperatures served as the basis for the calculation of the parameters of thermal stability of the glasses towards crystallization.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 256-258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Absorption Edge and Optical Band Gap of $Ag-As_{40}S_{30}Se_{30}$ Amorphous Samples
    Autorzy:
    Čajko, K.
    Lukić-Petrović, S.
    Štrbac, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401361.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.66.Jg
    Opis:
    The paper describes the results of a study of the influence of silver content on the absorption edge and optical band gap of the newly synthesized glasses of the $Ag_{x}(As_{40}S_{30}Se_{30})_{100-x}$ type for x=0, 0.5, 1, 2, 3, 5 at.% and of the corresponding films. The synthesis of bulk samples was performed in a rocking furnace from high-purity elemental components by a melt quenching method. Films were prepared from the synthesized bulk samples by pulsed laser deposition. Transmission spectra of the investigated samples were recorded at room temperature. The absorption edge and the optical band gap were determined by extrapolating the linear parts of the absorption spectra. It was found that the investigated range of Ag doping concentrations has a great influence on the absorption edge and optical band gap. Namely, with the increase of the silver content in the material the optical band gap showed a decrease. For films, it decreased from 2.02 eV, for the glass without silver, to 1.805 eV for the composition with 5 at.% Ag, whereas for the analogous bulk samples this decrease was from 1.84 eV to 1.609 eV.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1286-1288
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic Analysis of Thermal Processes in Ag-As-S-Se System Based on DSC Measurements
    Autorzy:
    Čajko, K.
    Lukić-Petrović, S.
    Štrbac, G.
    Ivetić, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398711.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    64.70.kj
    64.70.P-
    64.70.kg
    Opis:
    Thermal properties of glasses from the system $Ag_x(As_{40}S_{30}Se_{30})_{100-x}$ for x=0, 0.5, 1, 3, and 5 at.% were investigated by differential scanning calorimetry. The DSC curves were obtained under non-isothermal conditions which allowed determination of the glass transition temperature $T_{g}$ (onset temperature), crystallization temperature $T_{p}$ (corresponding to the crystallization peak maximum), melting temperature $T_{m}$, crystallization enthalpy $H_{c}$, and melting enthalpy $H_{m}$. The DSC curves obtained at the same heating rate were analyzed in order to study the variation of glass transition temperature with Ag concentration. Observed $T_{g}$ shift toward higher values, with increase in the heating rate, is in agreement with the Lasocka equation. Samples with 3 at.% and 5 at.% Ag were further thermally treated at different heating rates with the aim of analyzing kinetic processes of crystallization. The Moynihan and Kissinger models were used to calculate the activation energy of glass transition and activation energy of crystallization. For the samples that showed the crystallization processes an assessment of the thermal stability was done based on different criteria.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 509-513
    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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