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Wyszukujesz frazę "Gladysiewicz, M." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Form and Properties of the Tight-Binding Density of States in Two Dimensions. Possible Application to Superconductivity
    Autorzy:
    Gładysiewicz, M.
    Gonczarek, R.
    Mulak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030728.pdf
    Data publikacji:
    2002-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    74.20.Fg
    Opis:
    The form of the density of states for a tight-binding model with the first and the next-nearest neighbour hoppings for a rectangular planar lattice and a shift of the chemical potential are calculated. This is newly and comprehensively formulated integral form illustrated numerically, helpful in approach to two-dimensional superconducting models. In some particular cases the complete analytical forms of the density of states are obtained. It is shown that for all cases the density of states has a single van Hove singularity of the logarithmic type at the identically defined point. The proper approximate analytical representations are found. The difference between the exact numerical and approximate analytical forms is evaluated and illustrated.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 6; 865-874
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Form of Energy Gap and Critical Temperature of Superconductor Implied by Fluctuations of Density of States
    Autorzy:
    Gładysiewicz, M.
    Gonczarek, R.
    Mulak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014021.pdf
    Data publikacji:
    2000-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    Opis:
    The s-paired BCS superconductor with the electron density of states depending on energy in the vicinity of Fermi level is considered. The existence of such fluctuations of electron density of states may be referred to Van Hove singularities widely discussed in the literature. In the paper three types of small fluctuations of the electron density of states introduced about its average background's value are analysed: Lorentzian, triangle, and logarithmic ones. In order to calculate numerically the energy gap and critical temperature, the formalism of parametric BCS gap equations is applied. The positive fluctuations (peaks) correspond to the increase in occupied states number inducing a higher critical temperature. On the other hand, negative fluctuations, which decrease the number of occupied states, lead to a lower critical temperature. Such decrease in critical temperature can lead, at a specific choice of parameters, to the decease in superconductivity. The presence of fluctuations finds reflection in the shape of energy gap as a function of temperature. In the vicinity of T=0 an abrupt decrease or increase in the energy gap to the original BCS value, according to the sign of the fluctuation, is observed. In turn, the fluctuations do not change the behaviour of the energy gap near T$\text{}_{c}$.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 6; 1039-1051
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of Intersubband Absorption in GaInN/AlInN Quantum Wells
    Autorzy:
    Cywiński, G.
    Skierbiszewski, C.
    Siekacz, M.
    Kryśko, M.
    Feduniewicz-Żmuda, A.
    Gladysiewicz, M.
    Kudrawiec, R.
    Misiewicz, J.
    Nevou, L.
    Kheirodin, N.
    Julien, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811923.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Fs
    78.67.De
    68.65.Fg
    73.21.Fg
    81.15.Hi
    Opis:
    GaInN/AlInN multiple quantum wells were grown by RF plasma-assisted molecular beam epitaxy on (0001) GaN/sapphire substrates. The strain-engineering concept was applied to eliminate cracking effect and to improve optical parameters of intersubband structures grown on GaN substrates. The high quality intersubband structures were fabricated and investigated as an active region for applications in high-speed devices at telecommunication wavelengths. We observed the significant enhancement of intersubband absorption with an increase in the barrier thickness. We attribute this effect to the better localization of the second electron level in the quantum well. The strong absorption is very important on the way to intersubband devices designed for high-speed operation. The experimental results were compared with theoretical calculations which were performed within the electron effective mass approximation. A good agreement between experimental data and theoretical calculations was observed for the investigated samples.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1093-1099
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical basis for determining rolling resistance of belt conveyors
    Autorzy:
    Gładysiewicz, L.
    Konieczna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/972328.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    rolling resistance
    belt
    idler
    conveyor belt
    damping factor
    Opis:
    Conveyor belts are the most common way of mechanical handling equipment in industry, especially in underground and open-pit mines. Maintenance of conveyor belts generate high costs, there-fore energy savings belts have become popular in recent years. Constant development of continuous transport equipment and looking for savings implies necessary of carrying advanced theoretical research and analysis. In this case determine of indentation rolling resistance is the clue. Based on previous re-search authors suggested new theoretical model of determination rolling resistance. Authors proofed that stress distribution described in time coordinates coexists with lateral deformation of belt. In two dimensional Kelvin–Voigt model it has two components: the particular solution of the differential equation of belt’s model and an general solution (which is typical for harmonic load). In this new model authors included overlooked by others particular solution; that gives a possibility of designating the whole spectrum of changes in the value of the rolling resistance. The obtained results allow to specify new and more accurate damping factor.
    Źródło:
    Mining Science; 2016, 23; 105-119
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Theoretical Studies of Free and Acceptor-Bound Positive Magneto-Trions
    Autorzy:
    Bryja, L.
    Wójs, A.
    Płochocka-Polack, P.
    Gładysiewicz, A.
    Misiewicz, J.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047714.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Cn
    71.35.Ji
    73.21.Fg
    Opis:
    By combination of polarization-resolved photoluminescence, transport, and realistic numerics we study energy and recombination spectra of free and acceptor-bound positive trions in a quasi-two-dimensional hole gas. The singlet-triplet crossing in the trion ground state is found at B≈12 T, and a slight reduction of all trion binding energies coincident with the formation of a Laughlin hole fluid is observed at B≈14.2 T.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 415-418
    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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