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    Wyświetlanie 1-3 z 3
    Tytuł:
    Multifractal Nature of Diesel Engine Rattle Noise in Vehicle
    Autorzy:
    Puchalski, A.
    Komorska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/176736.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical noise
    mechanical vibration
    multifractal formalism
    alpha-stable distributions
    Opis:
    The investigation results of the emission of noises accompanying the diesel engine powertrain running in unloaded condition at low or idle speed, are presented in the hereby paper. The multifractal nature of the tested signals was confirmed by means of two groups of parameters. The proposed local parameters are based on the distribution of the probability density of measures, segregated into subsets according to pointwise Holder exponents. The obtained spectra constitute a set of multifractal measures related to singularities representing the local scaling of measures in various points of the time series. Global parameters were defined on the basis of multifractal measures of the parametrised Renyi’s entropy. These are properties treating summarily the whole spectrum of the emitted noise and reflecting changes of the vibroacoustic energy levels generated by noise sources. The tests encompassing simultaneous application of both groups of parameters confirmed their efficiency in the comparative analysis as well as in the subjective assessment of the noise level generated in the drive system of vehicles with diesel engines. This opens new possibilities within the simulation range of vehicle noises, for the needs of constructing the passive and active reduction systems of the effects of the vibroacoustic energy propagation.
    Źródło:
    Archives of Acoustics; 2017, 42, 3; 469-474
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethical vs Ideological in the Literary Discussions in Soviet Ukraine in the 1920s: Boris Eikhenbaum in Kharkiv in 1926
    Autorzy:
    Babak, Galina
    Powiązania:
    https://bibliotekanauki.pl/articles/2080848.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    formalism
    modernism
    Marxism
    Soviet Ukraine
    Eikhenbaum
    Nauki Humanistyczne i Społeczne
    Opis:
    The article examines the theoretical discussions on the dualism of “form” and “content” in literature and art that took place in Soviet Ukraine in the mid-1920s. The subject is considered in the context of the development of two competitive approaches of study of literature and art — Russian formalism and Marxism. The problem is observed through the comparison of ethical and ideological positions of the modernists and Marxists in Russia and Ukraine in the 1920s.
    Źródło:
    Historyka studia metodologiczne; 2019, 49; 41-53
    0073-277X
    Pojawia się w:
    Historyka studia metodologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of transport parameters in semiconductor superlattices based on the Greens’ functions method in different Hamiltonian representations
    Autorzy:
    Mączka, M.
    Hałdaś, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/202060.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    semiconductor superlattices
    NEGF formalism
    Wannier functions
    nadprzewodnik
    półprzewodnik
    Formalizm
    funkcja Wanniera
    Opis:
    Two methods for calculating transport parameters in semiconductor superlattices by applying Green’s functions are compared in the paper. For one of the methods, the Wannier functions method, where computations in the complex space and Wannier functions base are required, the Hamiltonian matrix is small in size and its elements depend solely on the energy. For the real space method, as it operates in the floating point domain and uses the Hamiltonian containing the elements dependent both on energy and position, the Hamiltonian matrix is larger in size. The size makes the method computationally challenging. To find the consequences of choosing one of the methods, a?direct comparison between the computations, obtained for both methods with the same input parameters, was undertaken. The differences between the results are shown and explained. Selected simulations allowed us to discuss advantages and disadvantages of both methods. The calculations include transport parameters such as the density of states and the occupation functions, with regard to scattering processes where the self-consistent Born approximation was used, as well as the spatial distribution of electron concentration for two superlattices structures. The numerical results are obtained within the non-equilibrium Green’s functions formalism by solving the Dyson and the Keldysh equations.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 3; 631-641
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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