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    Wyświetlanie 1-6 z 6
    Tytuł:
    Reverse reaction magnetic field in two-wire high current busduct
    Autorzy:
    Piatek, Z.
    Kusiak, D.
    Szczegielniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/97489.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    magnetic field
    high-current busduct
    elliptical field
    Opis:
    Work has shown how a reverse reaction magnetic field influences the whole magnetic field within the conductor and its vicinity. A description of this is presented in formulae for relative field values and parameters taking into account frequency, conductivity and diameter of the conductor. This has shown the field to be an elliptical field.
    Źródło:
    Computer Applications in Electrical Engineering; 2010, 8; 53-60
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aspect of the elliptical field in the screened flat three-phase high current busduct. Part I - In the internal area of the screen
    Aspekt pola eliptycznego w ekranowanym płaskim trójfazowym torze wielkoprądowym. Część I - W obszarze wewnętrznym ekranu
    Autorzy:
    Kusiak, D.
    Piątek, Z.
    Szczegielniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/376450.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    elliptical field
    screened flat three-phase high current busduct
    high current busduct
    external proximity effect
    internal proximity effect
    Opis:
    The paper shown the elliptical magnetic field in the high current screened busduct in the case of the both the external and internal proximity effect. For the characterisation of complex vector values for such a field it is proposed that the length of the longer ellipse semi axis as indicated by the end of the vector within one period be used. Part I describes of elliptic field in the internal area of the screen of the flat three-phase high current busduct.
    W artykule przedstawiono eliptyczne pole magnetyczne występujące w ekranowanym torze wielkoprądowym w przypadku zewnętrznego i wewnętrznego zjawiska zbliżenia. Do charakteryzowania wartości zespolonego wektora takiego pola zaproponowano długość dłuższej półosi elipsy jaką zakreśla koniec tego wektora w ciągu jednego okresu. Część I opisuje pole eliptyczne w obszarze wewnętrznym ekranu trójfazowego płaskiego toru wielkoprądowego.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 127-134
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kratery Morasko – obrona hipotezy ukośnego impaktu w kontekście dostępnej wiedzy i wyników badań
    Morasko craters – in defense of oblique impact origin based on knowledge and research
    Autorzy:
    Walesiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1830330.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    bilateral symmetry
    crater field
    elliptical craters
    forbidden zone
    meteorite Morasko
    oblique impact
    Opis:
    Over 2 years ago there was published an article (Bronikowska 2018a) challenging some results of research related to Morasko meteorite fall. Those results are huge problem for scientists who are not able to explain them using simplified models and maybe do not want to admit that some assumptions should be verified and redefined. One of hypothesis discussed in the paper was article manifesting that Morasko craters were created during oblique impact (Walesiak 2017) and that initial trajectory can be estimated by elongation of almost all cavities, their bilateral symmetries according to longer axis and observed asymmetries of rims. By comparison to Campo del Cielo craters Walesiak suggested that impact angle could be very shallow (10–20°), as ellipticity of all smaller Morasko structures is approx. 1,3. Further analysis of topography in neighborhood of Morasko revealed that there may exist more impact craters around this area, which may explain discovery of two iron meteorites near Oborniki village (17 km NW from Meteorite Morasko Restricted Area), unfortunately lost during World War II. In fact, Bronikowska confused definitions “oblique impact” and “elliptical craters”, what can be supported by given references (Elbeshausen et al. 2009) confirming Walesiak hypothesis. Unfortunately, this misunderstanding touches also another article of this author (Bronikowska et al. 2017), where obliquity was neglected. However, estimated during that modeling pre-impact angle (30–43°), according to known definitions written in many publications, should be classified as oblique impact. All elongated craters, as well as morphology of the largest structure in Meteorite Morasko Restricted Area suggest impact from NW while during reconstruction of meteoroid parameters Bronikowska assumed impactor coming from NE (based on existing strewn field). Considering not clear relation between meteorites and craters (e.g., lack of findings in cavities, relatively poor number of shrapnel fragments around structures and possibility that craters may be much older than fall of meteorites), it may be not enough reliable justification. Even if relation exists, example of Whitecourt (with distribution of meteorites downrange), compared with abundance of Morasko shrapnel fragments collected hundreds of meters NE from Restricted Area, undermines parameter used in modelling. Also, single fragmentation is doubtful, concluded after unreasonable omitting known craters outside Restricted Area (e.g., crater no 8 described by Pokrzywnicki (1964) and structure no 9 mentioned by Hodge (1994)). Finally, use of iSALE-2D shock physics code (valid for vertical impacts only) for modelling of elliptical craters formed during highly oblique impact (angle lower than 12°), even considering vertical component (which approximation is only applicable for impact into materials with a friction coefficient of about f=0,7 with no or very little cohesion) (Elbeshausen et al. 2009), also should not be considered as proper applied method leading to get valuable results. In this article there is proposed new strewn field definition for Morasko meteorite, based on elongation of all known and unconfirmed (yet) craters. Surprisingly, estimated (redefined) pre-impact trajectory gives convincing explanation for bilaterally symmetrical distribution of documented findings.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2021, 12; 108-128
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uniform field within a non-elliptical inhomogeneity in the vicinity of a nearby non-circular Eshelby inclusion
    Autorzy:
    Wang, X.
    Schiavone, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/38629511.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    non-elliptical inhomogeneity
    Booth’s lemniscate inclusion
    uniform field
    conformal mapping
    anti-plane elasticity
    inverse problem
    Opis:
    We rigorously prove that a non-elliptical inhomogeneity continues to permit an internal uniform stress field despite the presence of a nearby non-circular Eshelby inclusion undergoing uniform anti-plane eigenstrains when the surrounding matrix is subjected to uniform remote anti-plane stresses. Here, we adopt a specific representation of the non-circular Eshelby inclusion as a Booth’s lemniscate inclusion. Our analysis indicates that the internal uniform stress field inside the non-elliptical inhomogeneity is independent of the existence of the Booth’s lemniscate inclusion whereas the non-elliptical shape of the inhomogeneity is attributed entirely to its presence. Representative numerical examples are presented to demonstrate the feasibility of the proposed method of general solution.
    Źródło:
    Archives of Mechanics; 2021, 73, 5-6; 541-555
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    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
      Wyświetlanie 1-6 z 6

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