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Wyszukujesz frazę "Milivojević, D." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Room-Temperature Ferromagnetism in Zn-Mn-O, X-Ray Photoemission Surface Study
Autorzy:
Milivojević, D.
Babić-Stojić, B.
Blanuša, J.
Kovač, J.
Powiązania:
https://bibliotekanauki.pl/articles/1503685.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
81.40.Rs
81.70.Jb
82.80.Pv
Opis:
Room temperature ferromagnetic properties of Zn-Mn-O show evident dependence on manganese concentration and preparation conditions. We systematically studied series of samples with manganese concentration ranging from 0 to 10 at.%, prepared in air at thermal treatment temperatures ranging from 400 to 900°C. The samples were investigated by X-ray diffraction, TEM, magnetization measurements and XPS spectroscopy. XPS analyses of surface composition, chemical bonding and XPS depth profiling were successfully employed on powder revealing the chemical composition at the surface of the grains and underneath. The study emphasizes important role of the grain surface in observed room temperature ferromagnetism. It seems that the ferromagnetic phase is correlated with oxygen build up at the surface.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 311-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Mn-Doped Amorphous $SiO_2$ Matrix
Autorzy:
Milivojević, D.
Babić-Stojić, B.
Jokanović, V.
Jagličić, Z.
Makovec, D.
Powiązania:
https://bibliotekanauki.pl/articles/1503690.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Lk
75.47.Lx
75.50.Tt
Opis:
Samples of Mn-doped amorphous $SiO_2$ matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 - 20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is $λ-MnO_2$. At temperatures below $T_{C}$=43 K strong ferrimagnetism originating from the minor $Mn_3O_4$ phase masks the relatively weak magnetism of $λ-MnO_2$. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller $Mn_3O_4$ nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature $T_{C}$. The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the $λ-MnO_2$ crystal structure.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 316-321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the Fundamental Frequency of the Speech Signal Compressed by MP3 Algorithm
Autorzy:
Milivojević, Z. N.
Brodić, D.
Powiązania:
https://bibliotekanauki.pl/articles/177285.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fundamental frequency
speech compression
speech processing
signal representation
MP3
Opis:
The paper analyzes the estimation of the fundamental frequency from the real speech signal which is obtained by recording the speaker in the real acoustic environment modeled by the MP3 method. The estimation was performed by the Picking-Peaks algorithm with implemented parametric cubic convolution (PCC) interpolation. The efficiency of PCC was tested for Catmull-Rom, Greville, and Greville two- parametric kernel. Depending on MSE, a window that gives optimal results was chosen.
Źródło:
Archives of Acoustics; 2013, 38, 3; 363-373
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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