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Wyszukujesz frazę "Jedrzejewski, R." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Carbon Doped Austenitic Stainless Steel Coatings Obtained by Reactive Magnetron Sputtering
    Autorzy:
    Fryska, S.
    Giza, P.
    Jedrzejewski, R.
    Baranowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402218.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    68.60.Bs
    68.55.J-
    81.15.-z
    Opis:
    The paper presents the results of investigations of carbon doped austenitic stainless steel coatings (carbon S-phase) obtained by the reactive magnetron sputtering in the reactive atmosphere composed of argon and methane as a carbon source. Stainless steel targets were sputtered under different conditions. During the experiments the argon to methane proportion varied within a range 11/2-7/6. The other parameters such as temperature, pressure, sputtering power, etc. were kept constant. The phase composition was determined using the X-ray diffraction. Electron probe microanalysis (energy dispersive spectroscopy and wavelength dispersive spectroscopy) and glow discharge optical emission spectrometry techniques were used to study element composition of the coatings. Microstructure was investigated by scanning electron microscopy. It was found that varying the methane volume in the reactive atmosphere, it is possible to control the lattice parameter of the carbon S-phase.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 879-882
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of synthesis parameters of graphene/Fe₂O₃ nanocomposites on their structural and electrical conductivity properties
    Autorzy:
    Jędrzejewska, A.
    Sibera, D.
    Narkiewicz, U.
    Pełech, R.
    Jędrzejewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1055069.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.48.Gh
    65.80.Ck
    81.07.Bc
    Opis:
    Due to its fascinating properties such as high surface area, very good electrical and thermal conductivity, excellent mechanical properties, optical and electrochemical properties, graphene may be the ideal material as a substrate of nanocomposites for applications in electronics. Graphene layer can be used as a conductive matrix allowing good contact between crystallites of nanomaterials. Despite pure graphene, its composites with other species can be of interest. In this paper the results of studies on the effect of methods and parameters of synthesis, for obtaining composites graphene/Fe₂O₃ on their structural properties and electrical properties are presented. A series of experiments was conducted using a commercially available graphene (Graphene Nanopowder AO-3) and iron nitrate. The materials were obtained using two pressure methods: pressure synthesis in the autoclave and synthesis in the microwave solvothermal reactor. The syntheses were carried out in a solution of ethanol. The specific surface area, helium density, morphology, phase composition, thermal properties and electric conductivity of the obtained composites were investigated.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1424-1429
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of ZnO Doped with $Fe_{2}O_{3}$ - Hydrothermal Synthesis and Calcination Process
    Autorzy:
    Sibera, D.
    Jędrzejewski, R.
    Mizeracki, J.
    Presz, A.
    Narkiewicz, U.
    Łojkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807546.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    68.37.Hk
    81.07.-b
    81.16.Be
    Opis:
    The aim of the present work is to compare two methods of synthesis of nanocrystallline zinc oxide doped with iron oxide. The synthesis was carried out using microwave asssisted hydrothermal synthesis and traditional wet chemistry method followed by calcination. The phase composition of the samples was determined using X-ray diffraction measurements. Depending on the chemical composition of the samples, hexagonal ZnO, and/or cubic $ZnFe_{2}O_{4}$ were identified. The morphology of the received materials was characterized using scanning electron microscopy. Two different structures of agglomerates were observed: a hexagonal structure (corresponding to zinc oxide) and spherical (corresponding to spinel phase). The effect of the iron oxide concentration on specific surface area and density of the samples was determined.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-133-S-135
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global Structure of the Falicov-Kimball Model Ground State Phase Diagram
    Autorzy:
    Lach, J.
    Łyżwa, R.
    Jędrzejewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929588.pdf
    Data publikacji:
    1993-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    71.30.+h
    Opis:
    The two-state spinless Falicov-Kimball model on a one-dimensional lattice is studied by means of well-controlled numerical procedures. Restricted phase diagrams in the grand-canonical ensemble and at zero temperature are constructed. The evolution of these phase diagrams, as the interaction parameter U is varied, including the band structures corresponding to configurations of localized particles (ions) and densities of mobile particles (electrons), is monitored. The changes observed enable us to draw conclusions for the global structure of the phase diagram and to make a qualitative plot of such a diagram. Particular attention is paid to the possibility of conductor-insulator transitions. The results obtained suggest that the system is an insulator for all U only if the electron and ion densities ρ$\text{}_{e}$,ρ$\text{}_{i}$ satisfy the conditions: ρ$\text{}_{e}$ + ρ$\text{}_{i}$ = 1, |ρ$\text{}_{i}$ - 1/2| ≤ δ < 1/2. For all other pairs (ρ$\text{}_{e}$,ρ$\text{}_{i}$) there is a critical U at which the system undergoes a conductor-insulator transition.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 2; 327-344
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of social interactions on demand curves for innovative products
    Autorzy:
    Maciejowska, K.
    Jędrzejewski, A.
    Kowalska-Pyzalska, A.
    Weron, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075443.pdf
    Data publikacji:
    2016-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.65.Gh
    87.23.Ge
    Opis:
    Empirical studies suggest that word-of-mouth strongly influences the innovation diffusion process and is responsible for the "S" shape of the adoption curve. However, it is not clear how word-of-mouth affects demand curves for innovative products and strategic decisions of producers. Using an agent-based model of innovation diffusion, which links consumer opinions with reservation prices, we show that a relatively strong word-of-mouth effect can lead to the creation of two separated price-quantity regimes, with a nonlinear transition between them. A small shift of the product's market price can result in a drastic change of the demanded quantity and, hence, the revenues of a firm. Using Monte Carlo simulations and mean-field treatment we demonstrate that word-of-mouth may have ambiguous consequences and should be taken into account when designing marketing strategies.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 5; 1045-1049
    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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