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

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Distribution of Stochastic Impulses Acting on an Oscillator as a Function of Its Motion
    Autorzy:
    Jabłoński, M.
    Ozga, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537460.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    45.10.-b
    45.30.+s
    Opis:
    In previous papers formulas have been derived describing distribution of a random variable whose values are positions of an oscillator at the moment t, which, in the interval [0, t], underwent the influence of stochastic impulses with a given distribution. In this paper we present reasoning leading to an opposite inference thanks to which, knowing the course of the oscillator, we can find the approximation of distribution of stochastic impulses acting on it. It turns out that in the case of an oscillator with damping the stochastic process $ξ_{t}$ of its deviations at the moment t is a stationary and ergodic process for large t. Thanks to this, time average of almost every trajectory of the process, which is the n-th power of $ξ_{t}$ is very close to the mean value of $ξ_{t}^{n}$ in space for sufficiently large t. Thus, having a course of a real oscillator and theoretical formulae for the characteristic function $ξ_{t}$ we are able to calculate the approximate distribution of stochastic impulses forcing the oscillator.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 74-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the Distribution of Values of Stochastic Impulses Acting on a Discrete System in Relation to Their Intensity
    Autorzy:
    Jabłoński, M.
    Ozga, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490330.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    45.10.-b
    45.30.+s
    Opis:
    In our previous works we introduced and applied a mathematical model that allowed us to calculate the approximate distribution of the values of stochastic impulses $η_{i}$ forcing vibrations of an oscillator with damping from the trajectory of its movement. The mathematical model describes correctly the functioning of a physical RLC system if the coefficient of damping is large and the intensity λ of impulses is small. It is so because the inflow of energy is small and behaviour of RLC is stable. In this paper we are going to present some experiments which characterize the behaviour of an oscillator RLC in relation to the intensity parameter λ, precisely to λ E(η). The parameter λ is a constant in the exponential distribution of random variables $τ_{i}$, where $τ_{i} = t_{i} - t_{i - 1}$, i = 1, 2, ... are intervals between successive impulses.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-174-A-178
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Certain Problems Concerning Environmental Impact Assessment of Wind Turbines in Scope of Acoustic Effects
    Autorzy:
    Wszołek, T.
    Kłaczyński, M.
    Mleczko, D.
    Ozga, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197516.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.58.+z
    43.66.Lj
    87.50.Y-
    Opis:
    The paper deals with difficulties that are encountered by investors and decision-making authorities in the course of investment processes involving construction of wind power plants. Moreover, attention is focused on absence of standardized procedures that could be used to determine environmental impact of wind turbines, mainly in the scope of acoustic effects appearing in conditions typical for operation of such devices (strong wind), high elevation of related noise sources, and the nature of the sound emission (tonality and amplitude modulation). Lack of such procedures is a source of serious ambiguities developing in assessment of all investment stages - planning and forecasting, construction, and operation. An additional problem arises in the case of power plants located in the vicinity of Natura 2000 area, where construction projects are often obstructed on the grounds of unclear criteria concerning, among other things, the effect of acoustic phenomena on birds, bats, and other animals. It follows from the research presented in this paper that the consistent system of procedures and criteria should be worked out on the grounds of long-term monitoring studies.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-38-A-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the Distribution of Stochastic Impulses Acting on a High Frequency System through an Analysis of Its Vibrations
    Autorzy:
    Jabłoński, M.
    Ozga, A.
    Korbiel, T.
    Pawlik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504209.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    45.10.-b
    45.30.+s
    Opis:
    The motion of an oscillator with damping excited by impulses has the form $ξ_t = \frac{1}{\sqrt{a^2 - b^2}} \sum_{0
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 977-980
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composition and Microstructure of the Al-Multilayer Graphene Composites Achieved by the Intensive Deformation
    Autorzy:
    Czeppe, T.
    Korznikova, E.
    Ozga, P.
    Wrobel, M.
    Litynska-Dobrzynska, L.
    Korznikova, G.
    Korznikov, A.
    Czaja, P.
    Socha, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375203.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    81.05.uj
    81.05.ue
    81.05.uf
    Opis:
    The paper presents results of the studies concerning aluminum-graphene composites produced with use of step technique; first mechanical alloying of Al and graphene powders and later intensive deformation by the high pressure torsion. As a result small, thin and round samples of composites, about 10 mm in diameter were achieved. For comparison similar samples not containing graphene were investigated. The X-ray diffraction, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy were applied to study composites structures and analyze graphene content and atomic bonds. The Raman spectroscopy method suggested multilayer graphene, which could also be identified as the defected nano-graphite as a component of the composite structure as well as some small content of the aluminum carbides. The highly dispersed microstructures of aluminum matrices were identified with the transmission electron microscopy, showing difference between the samples produced with the increased number of rotations, leading to the increased deformation realized. This method revealed carbon and aluminum oxides in large amounts which is interpreted as a surface effect. This method suggested also formation of the carbon-metal and carbon-metal- oxygen atomic bonds, which might partially result from formation of the carbides.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 921-927
    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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