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Wyszukujesz frazę "Fritze, H." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Electrical, Electromechanical and Piezoelectric Properties of Ca₃TaGa₃Si₂O₁₄ Resonators at Elevated Temperatures
    Autorzy:
    Suhak, Yu.
    Schulz, M.
    Sotnikov, A.
    Schmidt, H.
    Fritze, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030925.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.65.Bn
    77.84.-s
    43.58.Bh
    07.20.Ka
    Opis:
    The electrical conductivity, resonance frequency and piezoelectric strain constants are determined for ordered piezoelectric Ca₃TaGa₃Si₂O₁₄ (CTGS) single crystals from room temperature to 900°C. The latter result from three independent methods, namely resonant, ultrasonic pulse-echo, and laser Doppler vibrometry techniques, which allows validating the results. Further, the long-term behaviour of fundamental materials properties including electrical conductivity and resonance frequency are examined at 1000°C for CTGS crystals, grown by different manufacturers. After an initial period of about 500 h, the conductivity is found to remain nearly constant for at least 1500 h. In a period of 2000-5000 h a decrease of conductivity by only 20% is observed. The resonance frequency is found to decrease almost linearly in a period of 500-5000 h for all investigated samples.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1069-1073
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Behaviour of PrCo_{1-x}Fe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements
    Autorzy:
    Pekinchak, O.
    Sugak, D.
    Ubizskii, S.
    Suhak, Yu.
    Fritze, H.
    Vasylechko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029711.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Fn
    61.05.cp
    65.40.De
    72.60.+g
    Opis:
    Crystal structure and transport properties of the mixed praseodymium cobaltites-ferrites PrCo_{1-x}Fe_xO₃ have been studied in the temperature range of 298-1173 K by a combination of in situ X-ray synchrotron powder diffraction and temperature dependent impedance spectroscopy measurements. In situ high temperature powder diffraction examination of PrCo_{1-x}Fe_xO₃ series revealed considerable anomalies in the lattice expansion which are especially pronounced for the cobalt-rich specimens. These anomalies, which are reflected in a sigmoidal dependence of the unit cell dimensions and in the considerable increase of the thermal expansion coefficients, are obviously associated with transitions of Co^{3+} ions from low spin to the higher spin states and the coupled metal-insulator transitions, occurring in in rare earth cobaltites at the elevated temperatures. Indeed, the temperature-dependent impedance measurements clearly prove the change of conductivity type from dielectric to the metallic behaviour in the mixed cobaltite-ferrites PrCo_{1-x}Fe_xO₃ at the elevated temperatures.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 798-801
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability and vulnerability of transformers for electricity transmission and distribution
    Autorzy:
    Berg, H.
    Fritze, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069269.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    critical infrastructure
    transformer
    reliability
    ageing
    blackouts
    Opis:
    In the last years the failure frequency of transformers increased, e.g. due to ageing or external hazards. In particular fires and explosions of main oil-filled transformers are considered as critical. Therefore, international experiences of transformer failures at nuclear and non-nuclear power plants and at substations have been investigated in more detail. Consequences of transformer failures with respect to a reliable electricity transmission and distribution as well as measures to enhance the reliability of critical infrastructure and to avoid blackouts are addressed.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2015, 6, 3; 15--24
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability and vulnerability of critical infrastructure : electricity distribution
    Autorzy:
    Berg, H, P.
    Fritze, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069366.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    critical infrastructure
    reliability
    transformer
    ageing
    failure statistics
    blackouts
    Opis:
    In recent years the failure frequency of transformers increased. In particular fires and explosions of main oilfilled transformers are considered as critical. Therefore, international experiences of transformer failures at nuclear and non-nuclear power plants and at substations have been investigated in more detail. Consequences of transformer failures with respect to a reliable electric power supply and distribution are addressed and proactive measures to enhance the reliability of critical infrastructure and to avoid blackouts are described.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2013, 4, 1; 9--20
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power plant transformer explosion and fire
    Autorzy:
    Berg, H.-P.
    Fritze, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069665.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    transformer
    power plants
    explosion
    fire
    simulation
    failure
    reliability
    risk management
    Opis:
    The transformer is the key equipment for electric power transmission. It has been found that main transformer failures require an in-depth assessment because of the high failure frequency and the resultant reliability and safety implications. Transformers are considered as a critical equipment because of the large quantity of oil in contact with high voltage elements. In particular, experience has shown an increasing number of transformer explosions and fires in all types of power plants worldwide. Therefore, these phenomena have been investigated and are discussed in more detail in this paper with regard to causes for these events, potential influence of the age of the transformers and possible diagnostic measure in order to avoid such events. For that purpose different types of databases have been evaluated.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2010, 1, 1; 35--42
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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