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    Wyświetlanie 1-5 z 5
    Tytuł:
    Numerical evaluation of fractional differ-integrals of some periodical functions via the IMT transformation
    Autorzy:
    Brzeziński, D.
    Ostalczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/201340.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional-order derivatives and integrals
    accuracy of numerical calculations
    numerical integration
    IMT Transformation
    Opis:
    This paper presents accuracy evaluation of the numerical calculations of the fractional differ-integrals. We focus on applying the Riemann-Liouville formula, on singularity, which appears while using classical form of this formula. To calculate it we use the Newton-Cotes’ Quadrature and additionally two Gaussian rules. Using this different approach to the IMT Transformation, transforming the “core” integrand of Riemann-Liouville formula, we point the possible way of increasing the accuracy of the calculations. We use our own tools and compare obtained results with, where possible, exact values, where not – values obtained using an excellent method of integration incorporated in Mathematica.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 285-292
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of main geometric characteristics of deformed sphere and standard spheroid
    Autorzy:
    Kovalchuk, Vasyl
    Mladenov, Ivaïlo M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27311436.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    deformed sphere
    standard spheroid
    sphericity index
    elliptic integrals
    elliptic functions
    tipping point
    bifurcation point
    sfera zdeformowana
    sferoida standardowa
    współczynnik sferyczności
    punkt zwrotny
    punkt bifurkacji
    całka eliptyczna
    funkcja eliptyczna
    Opis:
    In the paper we compare the geometric descriptions of the deformed sphere (i.e., the so-called λ-sphere) and the standard spheroid (namely, World Geodetic System 1984’s reference ellipsoid of revolution). Among the main geometric characteristics of those two surfaces of revolution embedded into the three-dimensional Euclidean space we consider the semi-major (equatorial) and semi-minor (polar) axes, quartermeridian length, surface area, volume, sphericity index, and tipping (bifurcation) point for geodesics. Next, the RMS (Root Mean Square) error is defined as the square-rooted arithmetic mean of the squared relative errors for the individual pairs of the discussed six main geometric characteristics. As a result of the process of minimization of the RMS error, we have obtained the proposition of the optimized value of the deformation parameter of the λ-sphere, for which we have calculated the absolute and relative errors for the individual pairs of the discussed main geometric characteristics of λ-sphere and standard spheroid (the relative errors are of the order of 10−6 – 10−9). Among others, it turns out that the value of the,sup> flattening factor of the spheroid is quite a good approximation for the corresponding value of the deformation parameter of the λ-sphere (the relative error is of the order of 10−4).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e147058
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-accuracy numerical integration methods for fractional order derivatives and integrals computations
    Autorzy:
    Brzeziński, D. W.
    Ostalczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/202213.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    accuracy of numerical calculations
    fractional-order derivatives and integrals
    double exponential formula
    gauss-jacobi quadrature with adopted weight function
    arbitrary precision
    numerical integration
    abel’s integral equation
    dokładność obliczeń numerycznych
    kwadratury Gaussa- Jacobiego z przyjętą funkcją wagi
    arbitralna precyzja
    całkowanie numeryczne
    równanie Abela
    Opis:
    In this paper the authors present highly accurate and remarkably efficient computational methods for fractional order derivatives and integrals applying Riemann-Liouville and Caputo formulae: the Gauss-Jacobi Quadrature with adopted weight function, the Double Exponential Formula, applying two arbitrary precision and exact rounding mathematical libraries (GNU GMP and GNU MPFR). Example fractional order derivatives and integrals of some elementary functions are calculated. Resulting accuracy is compared with accuracy achieved by applying widely known methods of numerical integration. Finally, presented methods are applied to solve Abel’s Integral equation (in Appendix).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 723-733
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanics of infinitesimal gyroscopes on helicoid-catenoid deformation family of minimal surfaces
    Autorzy:
    Kovalchuk, Vasyl
    Gołubowska, Barbara
    Mladenov, Ivaïlo M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2128134.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    action-angle analysis
    mechanics of infinitesimal gyroscopes
    geodesic equations of motion
    geodetic equations of motion
    helicoid-catenoid deformation family of minimal surfaces
    elliptic integrals
    elliptic functions
    analiza kąta działania
    mechanika nieskończenie małych żyroskopów
    równanie ruchu geodezyjne
    całki eliptyczne
    funkcje eliptyczne
    rodzina deformacji helikoidów minimalnych powierzchni
    rodzina deformacji katenoidów minimalnych powierzchni
    Opis:
    In this paper we explore the mechanics of infinitesimal gyroscopes (test bodies with internal degrees of freedom) moving on an arbitrary member of the helicoid-catenoid family of minimal surfaces. As the configurational spaces within this family are far from being trivial manifolds, the problem of finding the geodesic and geodetic motions presents a real challenge. We have succeeded in finding the solutions to those motions in an explicit parametric form. It is shown that in both cases the solutions can be expressed through the elliptic integrals and elliptic functions, but in the geodetic case some appropriately chosen compatibility conditions for glueing together different branches of the solution are needed. Additionally, an action-angle analysis of the corresponding Hamilton-Jacobi equations is performed for external potentials that are well-suited to the geometry of the problem under consideration. As a result, five different sets of conditions between the three action variables and the total energy of the infinitesimal gyroscopes are obtained.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136727, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanics of infinitesimal gyroscopes on helicoid-catenoid deformation family of minimal surfaces
    Autorzy:
    Kovalchuk, Vasyl
    Gołubowska, Barbara
    Mladenov, Ivaïlo M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173588.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    action-angle analysis
    mechanics of infinitesimal gyroscopes
    geodesic equations of motion
    geodetic equations of motion
    helicoid-catenoid deformation family of minimal surfaces
    elliptic integrals
    elliptic functions
    analiza kąta działania
    mechanika nieskończenie małych żyroskopów
    równanie ruchu geodezyjne
    całki eliptyczne
    funkcje eliptyczne
    rodzina deformacji helikoidów minimalnych powierzchni
    rodzina deformacji katenoidów minimalnych powierzchni
    Opis:
    In this paper we explore the mechanics of infinitesimal gyroscopes (test bodies with internal degrees of freedom) moving on an arbitrary member of the helicoid-catenoid family of minimal surfaces. As the configurational spaces within this family are far from being trivial manifolds, the problem of finding the geodesic and geodetic motions presents a real challenge. We have succeeded in finding the solutions to those motions in an explicit parametric form. It is shown that in both cases the solutions can be expressed through the elliptic integrals and elliptic functions, but in the geodetic case some appropriately chosen compatibility conditions for glueing together different branches of the solution are needed. Additionally, an action-angle analysis of the corresponding Hamilton-Jacobi equations is performed for external potentials that are well-suited to the geometry of the problem under consideration. As a result, five different sets of conditions between the three action variables and the total energy of the infinitesimal gyroscopes are obtained.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136727
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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