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    Wyświetlanie 1-5 z 5
    Tytuł:
    The thermal characteristics of ACCR lines as a function of wind speed – an analytical approach
    Autorzy:
    Zaręba, Marek
    Gołębiowski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2173672.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wind speed
    transient temperature field
    steady temperature field
    ACCR line
    mathematical modeling
    prędkość wiatru
    pole temperatury stacjonarne
    pole temperatury niestacjonarne
    linia ACCR
    modelowanie matematyczne
    Opis:
    The paper has investigated the effect of wind speed on selected thermal characteristics of the contemporary ACCR line. As wind speed functions, heating curves, stationary temperature profiles, steady-state current ratings and thermal time constants, have been determined. The composite core (Al–Al2O3) and the Al–Zr alloy braid were modeled as porous solids. As a result, the physical model is composed of a solid cylinder and a hollow cylinder with different material parameters of the above-mentioned elements. The mathematical model was formulated as the boundary-initial problem of the parabolic heat equation. The problem was solved by the state-superposition of and variable-separation method. On this basis, a computer program was developed in the Mathematica 10.4 environment and the velocity characteristics sought for were plotted. The results obtained analytically were positively verified by the finite-element method in the NISA v.16 environment. The physical interpretation of the determined characteristics has been given.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e141006
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical-numerical method for calculating the stationary thermal field in electrical systems with elliptical cross-sections
    Autorzy:
    Gołębiowski, Jerzy
    Zaręba, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2128141.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analytical-numerical methods of field theory
    elliptical conductors
    Poisson's equation
    metody teorii pola analityczno-numeryczne
    przewodniki eliptyczne
    równanie Poissona
    Opis:
    In this article, an analytical-numerical approach to calculating a stationary thermal field in the elliptical region is presented. The eigenfunctions of the Laplace operator were determined analytically, whereas the coefficients of the eigenfunctions were obtained numerically. The cooling was modeled with 3rd kind (Hankel’s) boundary condition, where the total heat transfer coefficient was the sum of the convective and radiative components. The method was used to analyze the thermal field in an elliptical conductor and a dielectrically heated elliptical column. The basic parameters of these systems, i.e. their steady-state current rating and the maximum charge temperature, were determined. The results were verified using the finite element method and have been presented graphically.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136738, 1--6
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical-numerical method for calculating the stationary thermal field in electrical systems with elliptical cross-sections
    Autorzy:
    Gołębiowski, Jerzy
    Zaręba, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2173609.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analytical-numerical methods of field theory
    elliptical conductors
    Poisson's equation
    metody teorii pola analityczno-numeryczne
    przewodniki eliptyczne
    równanie Poissona
    Opis:
    In this article, an analytical-numerical approach to calculating a stationary thermal field in the elliptical region is presented. The eigenfunctions of the Laplace operator were determined analytically, whereas the coefficients of the eigenfunctions were obtained numerically. The cooling was modeled with 3rd kind (Hankel’s) boundary condition, where the total heat transfer coefficient was the sum of the convective and radiative components. The method was used to analyze the thermal field in an elliptical conductor and a dielectrically heated elliptical column. The basic parameters of these systems, i.e. their steady-state current rating and the maximum charge temperature, were determined. The results were verified using the finite element method and have been presented graphically.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136738
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PHARMACOLOGICAL EVALUATION OF PYRROLIDINES AS POTENT ! 1 - ADRENERGIC RECEPTOR ANTAGONIST WITH URO-SELECTIVE PROFILE
    Autorzy:
    Sapa, Jacek
    Bednarski, Marek
    Nowiński, Leszek
    Kotańska, Magdalena
    Knutelska, Joanna
    Zaręba, Paulina
    LECHOCKA-NOWAK, Anna
    BELCZYK, Małgorzata
    ZYGMUNT, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/956844.pdf
    Data publikacji:
    2018
    Wydawca:
    Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
    Tematy:
    α1A/B receptor selectivity
    Opis:
    Continuing our efforts in developing potent α 1 -adrenoceptor antagonists with uroselective profile, a series of derivatives of pyrrolidines was biologically evaluated in vitro for their affinity for α 1 - and α 2 -adrenoceptors. Result from binding assays allowed the identification of compounds with the highest affinity and selectivity for α 1 -adrenoceptors behaving as potent antagonists at those sites in cellular functional assays. Among tested derivatives, compound V [1-(3-(4-(3- chlorophenyl)piperazin-1-yl)propyl)pyrrolidin-2-one], displayed a 152-fold functional preference to α 1A -adrenoceptor versus α 1B subtype. Finally, the most promising compound V at the doses of 2, 5 and 10 mg/kg after i.v. administered, in contrast to tamsulosin (at a dose of 2 mg/kg, i.v.) did not significantly decrease systolic and diastolic blood pressure in normotensive anesthetized rats. This selected α 1A -adrenoceptor antagonist with stronger uroselective profile, requires further research.
    Źródło:
    Medicina Internacia Revuo; 2018, 28, 110; 23-34
    0465-5435
    Pojawia się w:
    Medicina Internacia Revuo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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