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    Wyświetlanie 1-5 z 5
    Tytuł:
    The magnetocaloric effect in {[Cu(bapa)]₃[Cr(CN)₆]₂}ₙ · 6n H₂O at low temperatures
    Autorzy:
    Ráczová, K.
    Vavra, M.
    Hegedüs, M.
    Čižmár, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1048121.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Gw
    75.10.Pq
    Opis:
    The crystals of {[Cu(bapa)]₃[Cr(CN)₆]₂}ₙ·6nH₂O (bapa = bis(3-aminopropyl)amine) are formed by infinite Cu(II)-Cr(III) antiparallel chains, which are connected into the third direction by additive [Cu(bapa)] moieties. The onset of long-range magnetic order at 3.2 K was observed by AC susceptibility. The study of the magnetocaloric effect from magnetization measurements yields a large entropy change -ΔS_{M} = 13.65 J K¯¹mol¯¹ (-ΔS_{M} = 12.25 J kg¯¹K¯¹) at the field change from 0 T to 3 T at temperature 4 K. The analysis of the critical behavior of -ΔS_{M} suggests the value of critical exponent n = 0.577 at the ordering temperature characteristic for three-dimensional magnets with Ising anisotropy.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 429-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of more efficient use of simulation tools in enterprise logistics
    Autorzy:
    Hegedüš, M.
    Fedorko, G.
    Beluško, M.
    Hlatká, M.
    Fábera, P.
    Neradilová, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/102315.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    simulation
    logistics
    software
    efficiency
    modelling
    Opis:
    Computer simulation, as a powerful scientific and engineering tool, is increasingly used to solve a wide range of issues within the enterprise logistics processes. This trend is mainly due to the fact that the computer simulation method offers a whole range of benefits for enterprise logistics e.g. saving time, space and finance. The use of computer simulation in logistics, however, still has certain limitations that handicap it and do not allow it to be more operationally exploited. The main reason is that the creation of models of different logistics processes is exacting on the skills and knowledge in this area. The factors as the difficulty of creating new and modifying existing models or repeating simulation experiments complicate the more frequent application of computer simulation models in logistics. For this reason, it is necessary to look for a way to simplify and make the issue available to a larger circle of users.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 189-197
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increasing of selenium content and qualitative parameters in garden pea (Pisum sativum L.) after its foliar application
    Autorzy:
    Hegedűsová, A.
    Mezeyová, I.
    Hegedűs, O.
    Andrejiová, A.
    Juríková, T.
    Golian, M.
    Lošák, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543588.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    The presented paper deals with monitoring of the ways of selenium (Se) content increase by foliar biofortification with inorganic Se in two varieties of garden pea Pisum sativum L. (Premium, Ambassador) in the conditions of south Slovakia in 2014–2015. The results of experiments show that treatment of plants with two doses of Se concentration (50 g and 100 g Se ha–1 in the form of a sodium selenate anhydrous solution) at the flowering stage significantly increased the total Se content in the seeds of both varieties. Following the results by the consumption of 25 g of dried seeds of peas or 100 g of fresh pea seeds after the biofortification with 100 g Se ha–1 a recommended daily dose of Se in humans may be covered. The significantly positive influence of Se application on the total polyphenols content (TPC) has been confirmed in the both varieties after application of dosage in 100 g Se ha–1 (52% and 33%). A significant increase in the average value of total antioxidant capacity (TAC by DPPH method) in garden pea var. Ambassador was observed after the application of both doses of Se, in case of Premium variety only after application with a 100 g Se ha–1. Significantly increasing level of TAC by PCL (photochemiluminescence) method was found out only in case of var. Premium.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 6; 3-17
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-5 z 5

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