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    Wyświetlanie 1-8 z 8
    Tytuł:
    Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF₂ Nanocomposite Films
    Autorzy:
    Kasiuk, J.
    Fedotova, J.
    Przewoznik, J.
    Kapusta, Cz.
    Skuratov, V.
    Milosavljevic, M.
    Bondariev, V.
    Koltunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402191.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.30.Gw
    81.15.Jj
    81.40.Wx
    81.40.Rs
    61.80.Jh
    Opis:
    The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF₂ irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 828-831
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric and magnetic properties of nickel and nickel-plladium nanowires deposited in anodic aluminum oxide template
    Autorzy:
    Bayev, V.
    Fedotova, J.
    Maximenko, A.
    Streltsov, E.
    Malashchonak, M.
    Azarko, I.
    Fedotov, A.
    Svito, I.
    Patryn, A.
    Apel, P.
    Tyutyunnikov, S.
    Milosavljević, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/118462.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    template-assisted electrodeposition
    magnetic anisotropy
    magnetoresistance
    porous alumina templates
    anizotropia magnetyczna
    elektroosadzanie
    magnetoopór glinu
    Opis:
    Structure, electric and magnetic properties of ordered Ni and Ni-Pd nanostructures synthesized by means of electrochemical deposition in porous anodic aluminum oxide templates were investigated. Templates were filled with nickel and nickel-palladium compositions using the alternative current. Matrix parameters (pores diameter and depth) determine the sizes and morphology of the formed metal nanowires. Negative sign of magnetoresistance was observed at T < 50 K and attributed to TMR effect due to variable range hopping carrier transport mechanism. Positive magnitoresistance was observed at T > 100 K and explained by Lorence-like mechanism. The presence of magnetic perpendicular anisotropy towards template plane in synthesized nanostructures was revealed. Demagnetizing factors of individual nanowire in parallel and perpendicular direction towards template plane were determined by magnetic resonance spectroscopy. Revealed increase of coercivity in nanowires containing palladium was explained by the formation of quasi- multilayered structure of Ni/Pd nanowires during the ac electrochemical deposition.
    Struktura, właściwości elektryczne i magnetyczne uporządkowanych Ni Ni-Pd nanostruktur syntezowanych metodą elektrochemicznego nanoszenia w porowatej matryce z utlenionego aluminiowego anodu. Matryca została wypełniona Ni lub Ni-Pd mieszanką z wykorzystaniem prądu zmiennego. Parametry matrycy (średnica i głębokość pór) wpływały na rozmiary i morfologię tworzących się metalicznych nanodrutów. Ujemna magnetorezystancja była obserwowana w temperaturze T<50K i mogła być opisana w ramkach mechanizmu skokowej przewodności. Pozytywna magnetorezystancja została obserwowana dla T>100K i odpowiada mechanizmowi typu Lorence. Obecność magnetycznej prostopadłej anizotropii w stosunku do płaszczyzny matrycy była zanotowana. Demagnezujący czynnik pojedynczych nanodrutów w kierunkach równoległych i prostopadłych do płaszczyzny matrycy był wyznaczony z badań metodą magnetycznej spektroskopii rezonansowej. Zaobserwowany wzrost komercyjności w nanodrutach zawierających palladium może być związany z formowaniem kwasi-wielowarstwowej struktury w Ni/Pd nanodrutach w trakcie elektrochemicznego osadzenia.
    Źródło:
    Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2012, 4; 43-54
    1897-7421
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej
    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:
    Analytical performance analysis of the M2M wireless link with an antenna selection system over interference limited dissimilar composite fading environments
    Autorzy:
    Ðošić, Danijel
    Milić, Dejan
    Kontrec, Nataša
    Stefanović, Časlav
    Milosavljević, Srðan
    Stefanović, Dušan M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172127.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    mobile to mobile communication
    vehicle to vehicle communication
    Nakagami-m fading
    Rice fading
    probability density function
    cumulative density function
    urządzenia mobilne
    komunikacja między pojazdami
    funkcja gęstości prawdopodobieństwa
    Opis:
    This paper considers direct mobile-to-mobile (M2M) communications with a dual antenna selection (AS) system at a destination mobile node (DMN) in interference limited, dissimilar composite fading environments. In particular, we model dissimilar interference limited signals at the inputs of the dual branch AS system as (i) the ratio of two Nakagami-m (N) random variables (RVs) at the first branch and (ii) the ratio of two Rice RVs at the second branch, in order to account for non line-of-sight (NLOS) and line-of-sight (LOS) communications, respectively. Moreover, we assume variable powers of the desired as well as interference signals at the output of the DMN in order to account for the impact of shadowing. For the proposed model, we derive probability density functions, cumulative distribution functions, outage probabilities and average level crossing rates. The derived statistical results are evaluated for all the statistical measures considered and are graphically presented in order to provide insight into the impact of composite fading severities and LOS factors for the desired signal, as well as for the interference, on the system performances.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 569--582
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ruby Laser Interaction with Austenite Structural Materials
    Autorzy:
    Milosavljević, A.
    Petronić, S.
    Srećković, M.
    Ristić, S.
    Nešić, I.
    Pljakić, R.
    Negovanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808064.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    81.05.-t
    Opis:
    The investigations were carried out on chrome nickel steel and nickel based superalloy samples thermo-mechanically treated to obtain optimal mechanical properties and surface stability. Chrome nickel steel and a few nickel based superalloys samples were exposed to the laser beam before creep deformation process. The second group of nickel based superalloy samples were exposed after the creep deformation. The damages occurred by exposing of chrome nickel steel and nickel base superalloy samples to the ruby laser were analyzed by scanning electron microscope and energy-dispersive X-ray spectrometry. In this paper, the influence of laser dynamical regime (MW/$mm^{2}$) to the microstructural changes of heat treated chrome nickel steel and nickel based superalloy are analyzed and discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 823-825
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reparation of damaged forging dies by hard facing (HF) technology
    Autorzy:
    Lazic, V.
    Arsic, D.
    Nikolic, R. R.
    Aleksandrovic, S.
    Milosavljevic, D.
    Djordjevic, M.
    Cukic, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/111606.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    forging dies
    hard facing (HF)
    filler metals (FM)
    hardness
    microstructure
    matryce kuźnicze
    napawanie
    spoiwa
    twardość
    mikrostruktura
    Opis:
    The forging dies are in exploitation exposed to elevated temperatures and variable impact loads, both compressive and shear. Steels for manufacturing of these tools must endure those loads while maintaining mechanical properties and being resistant to wear and thermal fatigue. For those reasons, the alloyed steels are used for making the forging dies, though they have less weldability, because alloying increases proneness to hardening. Any reparatory hard facing (HF) of the damaged dies would require the specially adjusted technology to the particular piece. In this paper reparatory hard facing of dies used for forging pieces in the automobile industry is considered. Prior to reparatory hard facing of the real tools, numerous experimental hard facings on models were performed. All the model hard facings were done on the same steels which were used for production of the real forging dies. To define the optimal hard facing technology one needs to derive the optimal combination of the adequate heat treatment(s), to select the proper filler metals and the welding procedure. The established optimal HF technology was applied to real forging dies whose service life was further monitored in conditions of exploitation.
    Źródło:
    Production Engineering Archives; 2015, 6, 1; 26-29
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Electron Spectrometry of Molecules of Biological Interest
    Autorzy:
    Marinković, B. P.
    Milosavljević, A. R.
    Maljković, J. B.
    Šević, D.
    Petruševski, B. A.
    Pavlović, D.
    Filipović, D. M.
    Terzić, M.
    Pejčev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047901.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Gs
    34.80.Bm
    52.25.Os
    Opis:
    Optical absorption and emission spectroscopy together with low energy electron interaction (elastic scattering, excitation, ionization, resonances) with biologically relevant molecules (nitrogen, oxygen, water, alcohols, tetrahydrofuran, tetrahydrofurfuril alcohol, 3-hydroxytetrahydrofuran, pyrimidine, glycine, alanine) are studied in order to understand radiation damage and to investigate the presence of pollutants in the atmosphere. Versatile high resolution electron spectrometers are used in the present study of electron-molecule interactions. Energy loss spectra were recorded for these molecules in order to identify electronic transitions from ground state to both allowed and optically forbidden states. Optical emission spectra have been recorded from gas discharge processes by low resolution optical spectrometer (Ocean Optics 2000). Also, electronic spectra were compared with high resolution synchrotron photoabsorption spectra where these spectra had been available. Experimental methods of absorption-based laser spectroscopy were reviewed being of the most widely used analytical tools for detection of a specific molecule and quantitative measurements, based on the Beer-Lambert absorption law.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1145-1150
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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