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    Wyświetlanie 1-7 z 7
    Tytuł:
    Pulsed Power and Power Conditioning Capacitors
    Autorzy:
    Macdougall, F.
    Jow, T.
    Ennis, J.
    Yang, X.
    Yen, S.
    Cooper, R.
    Gilbert, J.
    Schneider, M.
    Naruo, C.
    Bates, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807873.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.32.Tt
    84.60.Ve
    Opis:
    A capacitor development effort focused on capacitors used in pulsed power and power conversion applications underwent at General Atomics Electronic Systems Inc. (GA-ESI) for decades. In recent years, funding for these efforts has accelerated the rate of development progress to the point where the time it takes to decrease the size of a capacitor by half has dropped from 10 years to 4 years. This progress made in pulsed power and power conversion capacitors will be described along with the performance characteristics of today's capacitors.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 989-991
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications
    Autorzy:
    Bischoff, R.
    Charon, R.
    Duperoux, J.
    Martin, B.
    Pinguet, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807853.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Ng
    84.32.Hh
    84.32.Tt
    84.60.Ve
    Opis:
    The need for repetitive high-power microwave systems, for instance within the scope of convoy protection, requires the availability of compact, repetitive pulsed-power generators. The development and the first experimental results of an upgraded balanced ISL Marx generator for future repetitive operations at pulse repetition frequencies in the order of 100 Hz are introduced. A key objective is to keep the fundamental modular coaxial concept by reason of its scalability and compactness. Simulation models were developed under the PSpice software package in order to investigate the charging and discharging phases of the Marx generator and also to determine the design criteria for repetitive operations. The charging resistors were replaced by ultracompact inductors for rapid charging, being able to withstand pulsed voltages up to 60 kV and pulsed currents up to 1.4 kA during the discharge phase. An improved type of strontium-titanate high-voltage ceramic capacitor was successfully tested experimentally up to 70 kV. Each new elementary stage of the Marx generator consists of eight 1.1 nF sectors of a cylinder capacitors mounted in parallel, two charging inductors of about 17.8 μH and two halves of spherical spark gaps. The pressurized self-triggered gas switches are arranged along the axis for fast consecutive breakdown thanks to the UV radiation emitted during the breakdown in each gap. The stages are installed in individual fibreglass housings. First experimental results of a 4-stage Marx generator in repetitive operation, driven by a 4 kW capacitor charging power supply up to a maximum voltage of 40 kV, are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 964-966
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of External Factors on Results of Bushing tanδ and Capacitance Measurements
    Autorzy:
    Buchacz, J.
    Szymanski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418039.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.37.+q
    77.22.Gm
    81.70.Ex
    84.32.Tt
    Opis:
    The paper presents influence of external factors on results of bushing dissipation factor tanδ and capacity measurements performed on not energized transformer as well as with operation voltage using on-line method. There are discussed methods and real cases of measurements, with emphasized differences in results interpretation. Conclusions and literature are summarized.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 900-904
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of High Permittivity Bismuth Copper Titanate in Multilayer Capacitors
    Autorzy:
    Szwagierczak, D.
    Kulawik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490915.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.22.-d
    81.20.-n
    84.32.Tt
    85.40.Xx
    Opis:
    A nonferroelectric high permittivity compound with the perovskite structure, $Bi_{2//3}Cu_3Ti_4O_{12}$, was synthesized at 900°C. The ceramic powder and appropriate organic additives were used for preparation of a slurry for tape casting. The obtained green tapes were smooth, flexible, and with a uniform thickness of 25 μm after drying at 50°C. Ag electrodes were screen printed on green rectangular sheets cut by a laser. Subsequent operations were screen printing of Ag internal electrodes, stacking of green sheets, isostatic lamination, cutting, deposition of external terminations and co-firing of dielectric and conductive layers at 850°C. Scanning electron microscopy observations showed well sintered, dense, fine-grained microstructure of ceramic layers and good cooperation with the electrodes made of commercial Ag paste. Capacitance and dissipation factor of multilayer capacitors were examined in the temperature range from - 55 to 330C at frequencies 10 Hz-2 MHz. The fabricated multilayer capacitors exhibit high capacitance and relatively low temperature coefficient of capacitance in the temperature range from - 55 to 110°C. The obtained lead-free high permittivity nonferroelectric material $Bi_{2//3}Cu_3Ti_4O_{12}$ is a spontaneously formed internal barrier capacitor. This material seems to be a promising alternative for conventional lead-based relaxor dielectrics in multilayer ceramic capacitors.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 119-121
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Internal Barrier Layer Capacitance Effects in Neodymium Copper Tantalate Ceramics
    Autorzy:
    Szwagierczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491313.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.22.-d
    81.05.Je
    81.20.-n
    84.32.Tt
    84.37.+q
    Opis:
    A new perovskite material $Nd_{2//3}CuTa_4O_{12}$ was applied as a naturally formed internal barrier layer capacitor. The powder prepared by solid state synthesis and ball milling was pressed into pellets and sintered at 1180-1220°C. Dielectric properties of ceramic samples were characterized by impedance spectroscopic studies carried out in the temperature range from - 55 to 700C at frequencies 10 Hz ÷ 2 MHz. Two types of the dielectric response were revealed - a high frequency response attributed to grains which occurred at low temperatures, and a low frequency one related to grain boundaries which dominated at higher temperatures. Resistances and capacitances of grains were found to be two orders lower than those of grain boundaries. Two plateaus were observed in the dielectric permittivity versus frequency plots - a low frequency step corresponding to a high value of $10^4$ and a high frequency step at a level of 40. Scanning electron microscopy observations and energy dispersive spectroscopy analysis confirmed that $Nd_{2//3}CuTa_4O_{12}$ ceramics were composed of semiconducting grains and insulating oxygen-enriched grain boundaries. The formation of such an electrically heterogeneous system during the one step fabrication process in air leads to spontaneous internal barrier layer capacitance effects responsible for a high and relatively stable dielectric permittivity of the developed material.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 205-207
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of annealing on the relaxation processes in Pt/SrTiO₃/Pt thin film capacitors
    Autorzy:
    Ouajji, H.
    Raouadi, K.
    Yangui, B.
    Guillan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1157994.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.32.Tt
    84.37.+q
    81.15.Cd
    73.61.-r
    77.22.Gm
    76.60.Es
    Opis:
    In this paper, the effect of the post-annealing on the dielectric properties of SrTiO₃ thin films (200 nm) grown by ion beam sputtering has been investigated. The measured dielectric constant dramatically increased after the post-annealing which is a consequence of the formation of the perovskite phase. A low frequency relaxation mechanism is clearly identified in the amorphous state of this material. Once crystallized, a second relaxation mechanism of lower amplitude is detected at high frequencies and for high measuring temperature. It is assumed that this second relaxation process is related to the space charges bound at the grain boundaries, whereas the first one was assigned to the thermally activated motions of the ionized oxygen vacancies and interfacial polarization under alternating field.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 791-794
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructured Iron-Substituted Lithium-Manganese Spinel as an Electrode Material for Hybrid Electrochemical Capacitor
    Autorzy:
    Lisovsky, R.
    Ostafiychuk, B.
    Budzulyak, I.
    Kotsyubynsky, V.
    Boychuk, A.
    Rachiy, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030917.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    73.63.Bd
    82.45.Yz
    82.47.Uv
    82.47.Wx
    84.32.Tt
    Opis:
    Structure, morphology and electrochemical properties of iron substituted lithium manganese spinel were investigated. The cyclic capability of obtained materials in aqueous electrolyte was studied. The kinetic characteristics of Li⁺-ions charge-discharge intercalation were determined.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 876-878
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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