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    Wyświetlanie 1-5 z 5
    Tytuł:
    Group invariant solution of some time fractional evolution equations
    Autorzy:
    Mandal, H.
    Bira, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/122890.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    fractional coupled Burger’s equation
    fractional DSSH equations
    Riemann Liouville’s fractional derivative
    Erdélyi-Kober operator
    symmetry analysis
    exact solution
    równania ewolucji
    ułamkowe równania różniczkowe
    ułamkowe równania DSSH
    pochodna ułamkowa Riemanna Liouville'a
    operator Erdélyi-Kober
    Opis:
    In this paper, we consider some classes of a system of nonlinear fractional differential equations (FDEs) arising in some important physical phenomena. Using symmetry group of transformations, the given systems of fractional partial differential equations (FPDEs) are reduced to systems of fractional ordinary differential equations (FODEs). Further, using the group invariant condition, we solve the reduced systems of FODEs and exact solutions of the given equations are constructed. Finally, the physical significance of the solutions are investigated graphically based on the exact solutions in order to highlight the importance of the study.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 4; 35-46
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    What does facial symmetry reveal about health and personality?
    Autorzy:
    Švegar, Domagoj
    Powiązania:
    https://bibliotekanauki.pl/articles/430782.pdf
    Data publikacji:
    2016-09-01
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    facial symmetry
    health
    personality
    attractiveness
    meta-analysis
    Opis:
    Over the last two decades, facial symmetry has been intensively researched. The present article aims to summarize empirical research concerning relations between facial symmetry and health and facial symmetry and personality. A systematic review of the literature shows that facial symmetry is one of the most influential visual markers of attractiveness and health, important for mate selection, while asymmetry can be considered a consequence of an individual’s inability to resist environmental and genetic stressors during development of the organism. However, in spite of evidence suggesting that preferences for facial symmetry are deeply rooted in our evolutionary history, a strong connection between facial symmetry and health is demonstrated only in studies measuring perceived health, while there is only scarce evidence corroborating the link between symmetry and actual health. The interconnections between facial symmetry and personality have not yet been extensively researched. Less than a dozen studies have addressed that issue and they have reached different conclusions. Some evidence suggests that facial symmetry signals personality attributes that indicate good psychological health, while other findings imply that pro-social personality traits negatively correlate with facial symmetry.
    Źródło:
    Polish Psychological Bulletin; 2016, 47, 3; 356-365
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationships between walking velocity and distance and the symmetry of temporospatial parameters in chronic post-stroke subjects
    Autorzy:
    Guzik, A.
    Drużbicki, M.
    Przysada, G.
    Kwolek, A.
    Brzozowska-Magoń, A.
    Sobolewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306249.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    udar
    symetria
    analiza lokomocji
    prędkość
    stroke
    symmetry
    gait analysis
    velocity
    Opis:
    Purpose: Subjects with post-stroke hemiparesis frequently present with asymmetric gait patterns. Symmetry, reflecting similarities in temporospatial, kinematic parameters, is an important measure of gait assessment. The study was designed to examine the relationships between asymmetry of temporal, spatial and kinematic gait parameters and walking velocity and distance. Methods: Temporospatial and kinematic gait parameters were examined in a group of 50 chronic post-stroke subjects and in a group of 25 healthy controls. Symmetry ratio was calculated for all the parameters. Gait velocity was measured during 10-metre test, the walking distance during 2-Minute Walk Test, and balance during Up&Go Test. Results: The relationship between stance phase duration symmetry and gait speed was at a moderate level (r = –0.43, p = 0.0173). There was a moderate relationship between swing phase symmetry and walking velocity and distance. The findings did not show a significant correlation between step length symmetry versus gait speed and distance. Conclusions: There is a mild relationship between self-selected gait velocity and walking distance versus temporal parameters symmetry. The findings do not confirm a relationship between self-selected gait velocity and walking distance versus spatial and kinematic parameters as well as balance. Likewise, no evidence confirms that asymmetry of temporal, spatial, kinematic gait parameters changes with the age of post-stroke subjects or is related to the length of time from stroke onset. Given the above, gait symmetry may be recognized as an important indicator of the level of gait control in post-stroke patients because it enables unique gait assessment, independent from other parameters.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 147-154
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of multiple bifurcation behavior for periodic structures
    Autorzy:
    Ario, I.
    Nakazawa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/38606394.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    periodic symmetry
    post-buckling analysis
    multiple bifurcation
    hill-top bifurcation
    multi-folding microstructure
    Opis:
    The classification of simple singularities in the post-buckling analysis of truss structures is well-known for elastic stability. To focus on multiple singularities including a hilltop bifurcation point (h-BP) and its bifurcation paths, we reviewed the multiple bifurcation analysis of multi-folding microstructure (MFM) models with periodic symmetry. Because the Jacobian at the h-BP of the MFM involves multiple 0-eigenvalues, it is challenging to analyse the bifurcation paths from the h-BP accurately. In this study, we investigated the multiple folding mechanism by analysing the neighbourhood of the h-BP and the symmetric subgroups of the geometric system in the two-dimensional plane and three-dimensional core of the MFM. We demonstrated that through the classification of multiple h-BP and bifurcation paths, it is possible to determine the unknown bifurcation equilibrium paths following h-BP, based on the Jacobian stability and the mechanism of symmetric subgroups in group theory containing the relationships between the primary path and the known bifurcation path(s) in the MFM system with periodic symmetry.
    Źródło:
    Archives of Mechanics; 2020, 72, 4; 283-306
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O roli informacji na temat macierzy wypłat w konkurencyjnej grze na rynku telekomunikacyjnym
    Autorzy:
    Laskowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/317362.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    symetria informacyjna
    asymetria informacyjna
    teoria gier
    analiza macierzy wypłat
    konkurencja
    rynek telekomunikacyjny
    information symmetry
    information asymmetry
    game theory
    payoff matrix analysis
    competition
    telecommunications market
    Opis:
    Na podstawie elementów teorii gier przeprowadzono analizę różnych przypadków symetrii i asymetrii informacyjnej, dotyczącej gier rynkowych na rynku telekomunikacyjnym. Jako przykład przeanalizowano wpływ informacji o strukturze kosztów, ponoszonych przez graczy konkurencyjnych w grze o zysk. Zilustrowano niektóre problemy związane z istnieniem ograniczeń informacyjnych oraz wskazano korzyści, jakie wypływają z ich przekraczania.
    Based on the games theory, an analysis of various cases of information symmetry and asymmetry was conducted with regard to market games in the telecommunications market. As an example, the influence of information about the structure of costs incurred by players competing for profit is analysed. Selected issues related to information limitations are presented, and benefits of overcoming such limitations are highlighted.
    Źródło:
    Telekomunikacja i Techniki Informacyjne; 2004, 3-4; 61-72
    1640-1549
    1899-8933
    Pojawia się w:
    Telekomunikacja i Techniki Informacyjne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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