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    Wyświetlanie 1-3 z 3
    Tytuł:
    Study of Capacitor & Diode Aging effects on Output Ripple in Voltage Regulators and Prognostic Detection of Failure
    Autorzy:
    K, Preethi Sharma
    Vijayakumar, T
    Powiązania:
    https://bibliotekanauki.pl/articles/2055277.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Buck
    MOSFET
    ESR
    SMPS
    voltage ripple
    Opis:
    Objectives: To design and simulate a buck converter and detector circuit which can prognostically indicate the power supply failure. Failure of Aluminium Electrolytic Capacitor (AEC) is considered as the parameter causing the power supply failure. To analyse variation of output ripple voltage due to possible changes in the Equivalent Series Resistance (ESR) and effective capacitance of the capacitor and design a detector to detect the failure of power supply prognostically. Methods: A DC-DC buck converter in SMPS topology is designed by assuming an input voltage of 12V with 3 volts possible fluctuations and an output voltage of 3.3 volts is desired. Simulation is carried out to measure the variation in output ripple voltage caused due to aging of electrolytic capacitor using TINA by Texas Instruments. A detector is also designed to compare the ripple voltage and a predefined threshold voltage so as to indicate the possible failure of Switched Mode Power Supply (SMPS) well in advance by monitoring the output ripple increase. Novelty: Having a fault tolerant power supply is very important in safety critical applications. Here by monitoring the output ripple variation, the degradation of AEC is predicted by calculating the ESR and capacitance variation. This simple yet effective prognostic detection will support in the design of fault tolerant power supplies. Highlight: It is found that, the ripple at the output increases with aging of the electrolytic capacitor, as with time the equivalent capacitance decreases and Equivalent Series Resistance (ESR) of the capacitor increases. The designed detector output is found to prognostically indicate the failure of SMPS.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 2; 281--286
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peripheral challenge by Small and Medium Sized Ports (SMPs) in Multi-Port Gateway Regions: the case study of northeast of China
    Autorzy:
    Feng, L.
    Notteboom, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259285.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    SMPS
    BER
    small and medium-sized enterprises (SMEs)
    Opis:
    This paper focuses on the role of small and medium-sized ports (SMPs) in enhancing the competitiveness and logistics performance of multi-port gateway regions and associated inland logistics systems. The concepts developed will be applied to the ports in the northeast of China, a multi-port gateway region around the Bohai Sea Economic Rim (BER). Port competition is analyzed by multi-variable methodology and generalized common characteristics of SMPs compared to gateway ports, and the similarities of SMPs and SMEs are also compared. Later in this paper, we analyze the role of a SMP in such region in different variables: (a) cargo volume and market share; (b) international connectivity; (c) relative cluster position; (d) port city and hinterland connection; and (e) logistics and distribution function. The five-dimension analysis combined with in-depth cases study of typical Yingkou port describes a profile of SMPs in the BER and provides future study possibility for more SMPs cases worldwide.
    Źródło:
    Polish Maritime Research; 2013, S 1; 55-66
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Can Social Media Set the Agenda in Addressing Violence Against Women?
    Autorzy:
    Omoera, Osakue Stevenson
    Powiązania:
    https://bibliotekanauki.pl/articles/1192613.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    SMPs
    Gender issues
    Agenda setting
    Violence
    Women
    Change agent
    Opis:
    Maxwell McCombs and Donald Shaw in “The Agenda-Setting Function of the Media” (1972) claimed that the power of the media to set a nation’s agenda, to focus public attention on key public concerns, including gender issues, is highly significant. This implies that the media can influence what the public think about. However, the statement is, to a large extent, in reference to the traditional or mainstream media. We live in a digital age. What about the new media or social media? Can social media platforms (SMPs) such as Twitter, YouTube and Facebook be used to set the agenda for change in contemporary society? Can SMPs be used to focus the attention of the public on gender issues, particularly on how to address sexual and other forms of violence against women? Can these platforms engender social change or they are just tools for leisure or entertainment? Employing descriptive and observational methods this article investigates three social media campaigns on Twitter and Facebook – He For She, Bring Back Our Girls and My Dress My Choice - with a view to assessing their capacity to set the public’s agenda towards combating sexual violence against women and whether social media is an effective tool to create awareness on what is at issue. While we argue that the social media is an acknowledged change agent which is capable of mobilizing the public to stand up against incidents of sexual violence, among other gender issues, the conclusion reached is that in the three instances we examined, the momentum is often short-lived.
    Źródło:
    World Scientific News; 2016, 60; 40-50
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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