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  • Voltage Dependence of Supercapacitor Capacitance

    Publication
    • A. Szewczyk
    • J. Sikula
    • V. Sedlakova
    • J. Majzner
    • P. Sedlak
    • T. Kuparowitz

    - Metrology and Measurement Systems - Year 2016

    Electronic Double-Layer Capacitors (EDLC), called Supercapacitors (SC), are electronic devices that are capable to store a relatively high amount of energy in a small volume comparing to other types of capacitors. They are composed of an activated carbon layer and electrolyte solution. The charge is stored on electrodes, forming the Helmholtz layer, and in electrolyte. The capacitance of supercapacitor is voltage- dependent. We...

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  • Specific guality management systems.

    Publication

    - Year 2007

    obecnie coraz więcej również niewielkich przedsiębiorstw wdraża i certyfikuje systemy zarządzania jakością. w większości przypadków bazą do opracowania szj są normy serii iso 9000, które ze względu na swój ogólny charakter nie zawsze wskazują konkretne rozwiązania możliwe do implementacji. coraz większą popularnością cieszą się jednak specyficzne, branżowe systemy zarządzania, lepiej dostosowane do specyfiki przedsiębiorstwa i...

  • Adaptive estimation of the transformer stray capacitances for DC–DC converter modelling

    New low cost and accurate estimation method of transformer stray capacitances for wide band DC–DC converter modelling and design is proposed. The Wiener filter (WF) method is applied to estimate the transformer impedance – referred to the selected transformer winding configurations. Laboratory tests are used to adapt the filter, that is to find optimal impedance which minimises mean square error between measured, noise perturbed...

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  • Comment on "On accurate capacitance characterization of organic photovoltaic cells"

    Publication

    In the 100th volume of Applied Physics Letters Carr and Chaudhary have presented a work on capacitance characterization of organic photovoltaic cells. The work concerns small signal measurements of various organic photovoltaic structures. The authors however limit their considerations to one part of small signal response, namely to capacitance measured either in parallel mode or in series mode. This attitude generally does not...

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  • Bbulk solids flow in silos by electrical capacitance tomography

    Publication

    - Year 2005

    W artykule przedstawiono wyniki doświadczeń w silosach z zastosowaniem elektrycznej tomografii pojemnościowej do pomiaru zmian wskaźnika porowatości.