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Wyszukujesz frazę "Kovacevic, A." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Laser-PMMA Interaction and Mechanical Stresses
    Autorzy:
    Kovačević, A.
    Srećković, M.
    Gospavić, R.
    Ristić, S.
    Jovanić, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047863.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Wx
    42.25.Bs
    61.80.Ba
    Opis:
    The polymethylmetacrylate samples were exposed to laser beams of various types of lasers. The modifications of the surfaces of the samples were analyzed by light microscopy and scanning electron microscopy. Numerical approach to thermal distribution for specified power ranges of selected lasers was obtained. The results of polymethylmetacrylate drilling and cutting performed by laser and non-laser means were compared by photoelastic methods.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 981-986
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam
    Autorzy:
    Milosavljevic, A.
    Petronic, S.
    Sreckovic, M.
    Kovacevic, A.
    Krmpot, A.
    Kovacevic, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791236.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    81.05.Bx
    81.20.Vj
    Opis:
    Due to the specific conditions of manufacturing, processing and utilization of nickel-base superalloys, the implementation of contemporary precision techniques is necessary in the research of the alloys features. Multi-component nickel-base superalloys, with about of 50% of nickel content, are commonly exploited in the conditions of high temperatures and pressures as well as in various aggressive operating environments. For successful quality control, which includes the monitoring of the changes in the alloy microstructure, fine-scale structure investigations are necessary. In this work, the samples of nickel-base superalloys have been exposed to 800 nm femtosecond laser in various operating regimes. Surface damages and dents caused by femtosecond laser pulses have been observed by optical and scanning microscopy.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 553-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Changes of Nickel-Base Superalloys Induced by Interaction with Femtosecond Laser Beam
    Autorzy:
    Petronic, S.
    Drecun-Nesic, S.
    Milosavljevic, A.
    Sedmak, A.
    Popovic, M.
    Kovacevic, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791235.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    81.05.Bx
    Opis:
    The investigation was performed on nickel-base superalloys, with nickel being the most influential alloying ingredient. After thermo-mechanical preparation and corresponding processing, femtosecond laser beam machining has been performed. The laser wavelength was 800 nm. The exposition time, during which the samples have been exposed to the pulses of femtosecond laser beam varied, as well as the average output power. The changes of both the output power and the exposition time enabled the samples to be irradiated with different total energy during each exposition. The changes in samples microstructure were observed with optical and scanning electron microscopy, with energy-dispersive spectrometry, and analyzed as well. Microhardness measurements of both base material and ablated spots have been performed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 550-552
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Models of Interactions of Laser Beams with Materials of Interest for Optical Components and Provoked Damages
    Autorzy:
    Srećković, M.
    Ilić, J.
    Kovačević, A.
    Pantelić, S.
    Latinović, Z.
    Borna, N.
    Ćosović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047854.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Wx
    61.80.Ba
    42.62.-b
    Opis:
    Models of interactions of laser beams with materials of interest for optical components are presented in this paper. Special attention is paid to damages which appear within both active materials and optical components along the path of a propagating beam with theoretical treatment via various models.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 935-940
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zeeman Coherences Narrowing due to Ramsey Effects Induced by Thermal Motion of Rubidium Atoms
    Autorzy:
    Grujić, Z.
    Mijailović, M.
    Panić, B.
    Minić, M.
    Kovačević, A.
    Obradović, M.
    Jelenković, B.
    Cartaleva, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814392.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Gy
    32.70.Jz
    Opis:
    We investigated effects of spatially separated laser fields on amplitudes and widths of electromagnetically induced transparency in M-type atomic system. We have shown narrowing of the electromagnetically induced transmission resonance and therefore enhancement of medium non-linearities that can be explained by diffusion-induced Ramsey narrowing. Depending on the polarization of two laser beams, narrow probe Hanle transmission resonance changes its sign in respect of the profile obtained when the pump laser beam is off.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 799-803
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence Analysis of Mode Dispersion in Step-Index Polymer Optical Fibers
    Autorzy:
    Kovacevic, M.
    Djordjevich, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795632.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.81.Ht
    42.81.Dp
    Opis:
    Temperature dependence of the mode dispersion is investigated for commercially available polymethyl methacrylate (PMMA) based step-index polymer optical fibers. An analytical expression is proposed describing the thermal variation of the fiber refractive index. This index decreases with increasing temperature as density of the polymer material drops. The study covered the temperature range from -60°C to 100°C. Results show that the modal dispersion decreases and the bandwidth increases with rising temperature.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 649-651
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Methods for Calculating Coupling Length in Step-Index Optical Fibers
    Autorzy:
    Savović, S.
    Djordjevich, A.
    Drljača, B.
    Kovačević, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795634.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.81.Qb
    42.81.Uv
    Opis:
    A recently reported function for calculation of the coupling length at which the equilibrium mode distribution is achieved in step-index plastic optical fibers is compared to a long established calculation method and to experimental findings. The recent function, while simpler to apply as it eliminates the need to numerically solve the power flow equation repeatedly for every case, is also more accurate for high numerical aperture (0.45 to 0.5) plastic optical fibers.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 652-654
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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