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    Wyświetlanie 1-4 z 4
    Tytuł:
    Unconventional procedure for inversion of polarimetric data: numerical calculation for a simple model of toroidal plasma
    Autorzy:
    Chrzanowski, J.
    Kravtsov, , Y. A.
    Mazon, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/147712.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Cotton-Mouton effect
    Faraday effect
    gradient method
    Opis:
    A gradient method is proposed for inversion of polarimetric data for tokamak plasma. It is assumed that the electron density and the normalized magnetic profile along the ray are known from experiments (scattering and magnetic measurements) in the spirit of the EFIT approach. Under these assumptions the maximum value of the electron density and maximum value of the magnetic field may be estimated by the gradient method. It is shown that with this method it is possible to achieve accuracy of about 0.1% already after 3-4 iterations.
    Źródło:
    Nukleonika; 2012, 57, 1; 37-41
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the gradient method for polarimetric data inversion
    Autorzy:
    Chrzanowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/359769.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Faraday effect
    Cotton-Mouton effect
    gradient method
    Opis:
    Gradient procedure is suggested, which allows to fit multi-parameter theoretical model to multi-channel experimental data obtained by means of polarimetric measurements. Procedure deals with nonlinear system of differential equations that describe the evolution of an electromagnetic wave in a hot plasma and provides sufficiently fast convergence to stationary values. The procedure is illustrated with numerical calculations in the case of one and two measurement channels, that allow to retrieve two and four of plasma parameters respectively.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 31 (103); 55-61
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new method of determining the parameters of thermonuclear plasma on the basis of multichannel polarimetric measurements
    Autorzy:
    Chrzanowski, J.
    Kravtsov, Y.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148759.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    angular variables
    gradient method
    plasma diagnostics
    plasma polarimetry
    polarimetric data inversion
    Opis:
    A gradient method has been proposed as an effective procedure to reconstruct real parameters of tokamak plasma by means of multichannel polarimetric measurements. High efficiency of the suggested procedure is illustrated by numerical calculations performed for a given plasma model taking into account the poloidal component of magnetic field. Polarization state of electromagnetic wave traditionally is characterized by azimuthal – ψ and ellipticity – χ angles. Evolution of these parameters along the ray is described by the equations of angular variables technique (AVT) introduced in previous works of the present authors. Numerical simulations have approved that the gradient procedure provides acceptable accuracy of inversion already after several iterations.
    Źródło:
    Nukleonika; 2013, 58, 2; 281-285
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody obliczania napięcia międzyfazowego z symulacji komputerowych
    Methods for calculation interfacial tension from computer simulations
    Autorzy:
    Chrzanowski, J.
    Lamperski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/172418.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    napięcie międzyfazowe
    symulacja komputerowa
    metoda Kirkwooda-Buffa
    metoda Bennetta
    metoda test-area
    układ rozszerzony
    funkcja fali kapilarnej
    metoda kwadratu gradientu
    interfacial tension
    computer simulation
    Kirkwood-Buff method
    Bennetts method
    test-area method
    expanded ensemble simulation
    capillary wave theory
    square gradient theory
    Opis:
    Interfaces have been recently a subject of profound interest for physicists, chemists and biologists because of the processes taking place in the interfacial region like adsorption, catalysis of chemical reactions etc. Computer simulations treat an interface in a full atomic level and by that they are a valuable complementary technique for experiment and theory. In this paper, different methods for the calculation of an interfacial tension by computer simulations are described and compared. The most commonly used method for the interfacial tension calculation was developed by Kirkwood-Buff. It is based on the mechanical route definition. This approach uses normal and tangential pressure components of the pressure tensor. The interfacial tension can be also evaluated through its thermodynamic definition. The method of Bennett defines the interfacial tension as the free energy difference of two (or more) systems relative to the difference in interfacial areas. The “test- -area” method is based upon the perturbation formalism. The test state is obtained from an infinitesimal change of the surface area of the reference system. The third method based on the thermodynamic route used to evaluate the interfacial tension is thought as an expanded ensemble simulation where two systems with different free energy and the interfacial area are connected by a discrete chain of intermediate subsystems. The next approach is based on the capillary wave theory formalism which provides a relationship between the surface tension and the wave width due the capillarity broadening. Interfacial tension may be also computed from the square gradient theory which is based on the expansion of the Hemholtz free energy in the Taylor series around the homogeneous state with the assumption that the molecular gradients in the interface are small compared to intermolecular distance. The theoretical basis, application and results of computer simulations of each method are presented. Aa accuracy of the methods in different simulation methodologies and systems is compared.
    Źródło:
    Wiadomości Chemiczne; 2014, 68, 3-4; 257-278
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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