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    Wyświetlanie 1-3 z 3
    Tytuł:
    AC Magnetic Properties of Vitroperm Based Composite Materials
    Autorzy:
    Kollár, P.
    Hegedüs, L.
    Füzer, J.
    Bureš, R.
    Fáberová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1533956.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    81.05.Ni
    85.70.-w
    75.60.-d
    75.50.Bb
    Opis:
    The aim of this work was to investigate the influence of resin content on AC magnetic properties of Vitroperm 800-based composite material to extend possibilities for application of this kind of material at higher frequency (up to 100 kHz). The samples of composite material were prepared in the form of the ring with outer diameter of 25 mm, inner diameter of 18 mm and height approximately 3 mm. Powder mixtures were prepared from Vitroperm 800 in partial nanocrystalline state and commercial termoset resins by mechanical mixing. The AC magnetic properties (losses) at maximum induction up to 0.5 T were measured by MATS-2010SA loop tracer in frequency range 1-100 kHz. The specific resistivity of the material was measured by the van der Pauw method. The magnetic properties of the composite rings were compared with the properties of the material prepared from Fe based powder supported by Höganäs. It was found out that the total losses of the Vitroperm-based soft magnetic composite are more than 10 times lower (at 10 kHz) than that for Fe-based one.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 787-789
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Vitrovac Content on Magnetic Properties in Composite Materials Based on the Mixture of Two Ferromagnets
    Autorzy:
    Hegedűs, L.
    Kollár, P.
    Füzer, J.
    Bureš, R.
    Fáberová, M.
    Kurek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032700.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.50.Cc
    75.50.Kj
    75.60.-d
    Opis:
    Soft magnetic composite materials play an important role in nowadays industry, replacing the traditional materials such as electrical steels and soft ferrites, especially at medium and higher frequency applications. The material can be tailored for a specific application by changing the composition of the material and by adaptation of the fabrication process. The aim of this work was to investigate the morphology, phase composition and magnetic properties of soft magnetic composite materials with various magnetic content to minimize the total magnetic losses. The prepared sample series was based on the mixture of two different ferromagnets Vitrovac 6155 and Somaloy 700 without addition of insulating material. The samples were prepared by conventional powder metallurgy with particular fraction of Vitrovac in the form of a ring for magnetic measurements in AC fields and electric resistivity measurements. The samples with 5 wt% and 20 wt% fractions of Vitrovac exhibit lower values of total losses in comparison with Somaloy heat treated at 530°C.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 765-767
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The uses of Betula pendula Roth among Hungarian Csangos and Szekelys in Transylvania, Romania
    Autorzy:
    Papp, N.
    Czegenyi, D.
    Hegedus, A.
    Morschhauser, T.
    Quave, C.L.
    Cianfaglione, K.
    Pieroni, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/57187.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    silver birch
    Betula pendula
    ethnobotany
    medicinal plant
    traditional knowledge
    birch sap
    Transylvania region
    Romania
    Opis:
    The aim of this work is to evaluate the ethnobotanical and ethnopharmacological use of Betula pendula Roth in various regions of Transylvania, in East and Central Romania. Silver birch is an important pioneer species in the country, which has traditionally been used in ethnomedicine, households and various customs. Among the ethnic groups, 55 informants from the Csángós and 68 from the Székelys were interviewed in six villages during field studies occurring between 2007 and 2012. Informants were asked questions about the medical and non-medical applications of B. pendula, focusing on the use of the leaf and woody parts in tools and customs, and on the collection and use of birch sap with its temporal change in local ethnomedicinal knowledge. Differences related to the use of birch among the studied areas were observed. The folk remedies prepared from the sap (“virics”) and leaves were documented in local customs, with similar symbolic roles assigned to birch used in other countries. Sap collection was performed during interviews and by manual means. Four special section types on the trunk were presented, and data concerning the nutritional and ethnomedicinal use of the sap was recorded. Both the significance and use of birch sap have drastically decreased in Transylvania due to the appearance of new phytotherapeutical sources and to social changes caused by migration of young people. We found that this phenomenon is gradually leading to the disappearance traditional harvesting techniques, frequency of use and ethnomedicinal knowledge concerning B. pendula in the studied regions.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2014, 83, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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