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    Wyświetlanie 1-10 z 10
    Tytuł:
    Searches for discrete symmetries violation in ortho-positronium decay using the J-PET detector
    Autorzy:
    Kamińska, D.
    Gajos, A.
    Czerwiński, E.
    Bednarski, T.
    Białas, P.
    Gorgol, M.
    Jasińska, B.
    Kapłon, Ł.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Sharma, N. G.
    Silarski, M.
    Słomski, A.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Zgardzińska, B.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147408.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    discrete symmetries
    J-PET
    ortho-positronium
    Opis:
    In this paper, we present prospects for using the Jagiellonian positron emission tomograph (J-PET) detector to search for discrete symmetries violations in a purely leptonic system of the positronium atom. We discuss tests of CP and CPT symmetries by means of ortho-positronium decays into three photons. No zero expectation values for chosen correlations between ortho-positronium spin and momentum vectors of photons would imply the existence of physics phenomena beyond the standard model. Previous measurements resulted in violation amplitude parameters for CP and CPT symmetries consistent with zero, with an uncertainty of about 10−3. The J-PET detector allows to determine those values with better precision, thanks to the unique time and angular resolution combined with a high geometrical acceptance. Achieving the aforementioned is possible because of the application of polymer scintillators instead of crystals as detectors of annihilation quanta.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 729-732
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noether and matrix methods to construct local symmetries of Lagrangians
    Autorzy:
    Lam-Estrada, P.
    Ovando, G.
    López-Bonilla, J.
    López-Vázquez, R.
    Vidal-Beltrán, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177899.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Gauge identities
    Local symmetries
    Noether theorem
    Singular Lagrangians
    Opis:
    We exhibit an elementary presentation of matrix and Noether techniques to construct infinitesimal point symmetries of Lagrangians. Besides, we employ the Lanczos approach to Noether’s theorem to obtain the first integral associated with each symmetry. We show applications to several singular Lagrangians of interest in classical mechanics.
    Źródło:
    World Scientific News; 2018, 97; 51-68
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The method of high accuracy calculation of robot trajectory for the complex curves
    Autorzy:
    Lozhkin, Alexander
    Bozek, Pavol
    Maiorov, Konstantin
    Powiązania:
    https://bibliotekanauki.pl/articles/409917.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    analytical method
    linear transformations
    planar complex curves
    symmetries
    Opis:
    The geometric model accuracy is crucial for product design. More complex surfaces are represented by the approximation methods. On the contrary, the approximation methods reduce the design quality. A new alternative calculation method is proposed. The new method can calculate both conical sections and more complex curves. The researcher is able to get an analytical solution and not a sequence of points with the destruction of the object semantics. The new method is based on permutation and other symmetries and should have an origin in the internal properties of the space. The classical method consists of finding transformation parameters for symmetrical conic profiles, however a new procedure for parameters of linear transformations determination was acquired by another method. The main steps of the new method are theoretically presented in the paper. Since a double result is obtained in most stages, the new calculation method is easy to verify. Geometric modeling in the AutoCAD environment is shown briefly. The new calculation method can be used for most complex curves and linear transformations. Theoretical and practical researches are required additionally.
    Źródło:
    Management Systems in Production Engineering; 2020, 4 (28); 247-252
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Constraints and gauge relations in the Lagrangian formalism
    Autorzy:
    Lam-Estrada, P.
    López-Bonilla, J.
    López-Vázquez, R.
    Vidal-Beltrán, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178075.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Gauge identities
    Genuine constraints
    Local symmetries
    Noether’s theorem
    Singular Lagrangians
    Opis:
    For several Lagrangians we show that their local symmetries can be obtained from the associated Euler-Lagrange equations, and we exhibit the explicit presence of the genuine constraints into gauge identities. We also employ the Lanczos approach to Noether’s theorem to give connections between the genuine constraints and their time derivatives. Besides, it is evident that the Hamiltonian secondary and tertiary constraints have relationship with the genuine constraints.
    Źródło:
    World Scientific News; 2018, 95; 215-223
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrable three-dimensional coupled nonlinear dynamical systems related with centrally extended operator Lie algebras
    Autorzy:
    Hentosh, O. Ye.
    Prykarpatsky, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/255480.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    centrally extended operator Lie algebra
    Lax-type flows
    Backlund transformation
    "ghost" symmetries
    Opis:
    A hierarchy of Lax-type flows on a dual space to the centrally extended Lie algebra of integral-differential operators with matrix-valued coefficients is considered. By means of a specially constructed Backlund transforniation the Hamiltonian representations for these flows coupled with suitable eigenfunctions and adjoint eigenfunctions evolutions of associated spectral problems are obtained. The Hamiltonian description of the corresponding set of additional symmetry hierarchies is represented. The relation of these hierarchies with Lax integrable (3+1)-dimensional nonlinear dynamical systems and their triple Lax-type linearizations is analysed.
    Źródło:
    Opuscula Mathematica; 2007, 27, 2; 231-244
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Lepschy stability test and its application to fractional-order systems
    Autorzy:
    Casagrande, Daniele
    Krajewski, Wiesław
    Viaro, Umberto
    Powiązania:
    https://bibliotekanauki.pl/articles/1409108.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional-order systems
    D-stability
    recursive algorithms
    complex polynomials
    root locus
    symmetries
    control-theory didactics
    Opis:
    It is shown how a stability test, alternative to the classical Routh test, can profitably be applied to check the presence of polynomial roots inside half-planes or even sectors of the complex plane. This result is obtained by exploiting the peculiar symmetries of the root locus in which the basic recursion of the test can be embedded. As is expected, the suggested approach proves useful for testing the stability of fractional-order systems. A pair of examples show how the method operates. It is believed that the suggested geometric approach can also be of some didactic value in introducing basic control-system tools to engineering students.
    Źródło:
    Archives of Control Sciences; 2021, 31, 1; 145-163
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The method of the fast Radon transform calculation based on the usage of scheme calculation symmetry properties
    Metoda szybkich przekształceń Radona bazująca w obliczeniach na użyciu własności symetrii
    Autorzy:
    KOBASYAR, MYHAYLO
    KOSAREVYCH, ROSTYSLAV
    BOHDAN, RUSYN
    MOLGA, AGNIESZKA
    Powiązania:
    https://bibliotekanauki.pl/articles/456296.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    transformation
    integration line
    rotational-mirrored symmetries
    system matrix
    transformacja
    linia integracji
    obrotowa symetria obrazu
    system macierzy
    Opis:
    The method of the fast Radon transform calculation whith uses properties of symmetry has been proposed. The scheme calculation symmetry properties were investigated. It allows to calculate less number of necessary characteristics. The carried out researches have shoun affectivity of proposed method, with essentially alloved to decrease time of Radon transform calculation.
    Zaproponowano metodę szybkiego przetwarzania Radona, która wykorzystuje własności symetrii. Zbadano schemat własności symetrii. Pozwala to obliczyć mniejszą ilość potrzebnych charakterystyk. Prowadzone badania pokazują efektywność zaproponowanej metody, która pozwala zmniejszyć czas obliczenia szybkiego przetwarzania Radona.
    Źródło:
    Edukacja-Technika-Informatyka; 2010, 1, 2; 218-224
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symbolic computation of variational symmetries in optimal control
    Autorzy:
    Gouveia, P. D.
    Torres, D. F.
    Rocha, E. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970020.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowanie optymalne
    variational symmetries
    gauge term
    nonconservative forces
    computer algebra systems
    Noether's theorem
    first integrals
    optimal control
    Opis:
    We use a computer algebra system to compute, in an efficient way, optimal control variational symmetries up to a gauge term. The symmetries are then used to obtain families of Noether's first integrals, possibly in the presence of nonconservative external forces. As an application, we obtain eight independent first integrals for a sub-Riemannian nilpotent problem (2,3,5,8).
    Źródło:
    Control and Cybernetics; 2006, 35, 4; 831-849
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lie symmetries and conserved quantities of discrete constrained Hamilton systems
    Autorzy:
    Mingliang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/122848.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    discrete difference variational principle
    constrained Hamilton systems
    Lie symmetries
    conserved quantities
    symetrie Liego
    system Hamiltona
    teoria symetrii
    dyskretne uklady mechaniczne
    Opis:
    In this paper, the Lie symmetry theory of discrete singular systems is studied in phase space. Firstly, the discrete canonical equations and the energy evolution equations of the constrained Hamilton systems are established based on the discrete difference variational principle. Secondly, the Lie point transformation of discrete group is applied to the difference equations and constraint restriction, and the Lie symmetry determination equations of the discrete constrained Hamilton systems are obtained; Meanwhile, the Lie symmetries of singular systems lead to the discrete Noehter type conserved quantities when the structure condition equations (discrete Noether identity) are established. Finally,an example is given to illustrate the application, the results show that the conservative constrained Hamilton systems also have the discrete energy conservation.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 3; 61-70
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lie symmetries of first order neutral differential equations
    Autorzy:
    Lobo, Jervin Zen
    Valaulikar, Y.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/122564.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    determining equations
    infinitesimals
    invariance
    neutral differential equations
    splitting equations
    symmetries
    równanie różniczkowe pierwszego rzędu
    warunek niezmienności
    symetrie
    równanie różniczkowe neutralne
    Opis:
    In this paper we extend the method of obtaining symmetries of ordinary differential equations to first order non-homogeneous neutral differential equations with variable coefficients. The existing method for delay differential equations uses a Lie-Bäcklund operator and an Invariant Manifold Theorem to define the operators which are used to obtain the infinitesimal generators of the Lie group. In this paper, we adopt a different approach and use Taylor’s theorem to obtain a Lie type invariance condition and the determining equations for a neutral differential equation. We then split this equation in a manner similar to that of ordinary differential equations to obtain an over-determined system of partial differential equations. These equations are then solved to obtain corresponding infinitesimals, and hence desired equivalent symmetries. We then obtain the symmetry algebra admitted by this neutral differential equation.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 1; 29-40
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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