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Wyszukujesz frazę "induced currents" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Calculation of inductances and induced currents in cryogenic by-pass line for SIS100 particle accelerator at FAIR
    Autorzy:
    Tomków, Łukasz
    Trojanowski, Stanisław
    Ciszek, Marian
    Chorowski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/141153.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    line inductance
    mutual inductance
    induced currents
    superconducting bus-bars
    particle accelerators
    Opis:
    Quality of electric current delivered to the magnets of a particle accelerator is essential for safety and reliability of its operation. Even small discrepancies strongly affect the properties of particle beams. One of the sources of the disturbances is the appearance of induced currents caused by the electromagnetic interactions between the elements of the machine. In this paper the calculations of induced currents in by-pass lines of a SIS100 particle accelerator are presented. In order to find the values of the currents the self-inductances and mutual inductances of the by-pass lines are found. Due to the complex geometry of the line, especially of Ω-shaped dilatations, the numerical approach was employed. The calculations show that the size of induced currents increases with the distance between the cables in an individual bus-bar. The maximum discrepancy of the magnetic field in a dipole magnet is found to be 7.7 μT. The decrease of distance between the cables allows one to obtain a discrepancy of 1.2 μT.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 485-496
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of GIC effects on core losses in single phase power transformers
    Autorzy:
    Mousavi, S.A.
    Engdahl, G.
    Agheb, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/141321.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transformator energetyczny
    prądy indukowane geomagnetycznie
    histereza
    power transformers
    geomagnetically induced currents
    hysteresis
    Opis:
    This paper presents a method for estimation of core losses in banks of single phase power transformers that are subjected to an injected DC current such as geomagnetically induced currents (GIC). The main procedure of the core loss calculation is to obtain a magnetic flux density waveform in both time and location by using a novel algorithm based on 3D FEM inside the core and then to calculate the loss distribution based on loss separation theory. Also, a simple and effective method is proposed for estimation of losses of asymmetric minor loops by using combination of symmetric loops. The effect of DC biasing on core losses in single phase power transformers is investigated and the sensitivity of core type and material is evaluated. the results shows that DC current biasing could increase core losses up to 40 percent or even more.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 1; 35-47
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Menometrorrhagia in magnetic resonance imaging operators with copper intrauterine contraceptive devices (IUDS): A case report
    Autorzy:
    Gobba, Fabriziomaria
    Bianchi, Nadia
    Verga, Paolo
    Contessa, Gian M.
    Rossi, Paolo
    Powiązania:
    https://bibliotekanauki.pl/articles/2180120.pdf
    Data publikacji:
    2012-03-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    static magnetic fields
    occupational exposure
    induced currents
    workers at particular risk
    menometrorrhagia
    Opis:
    The paper describes the cases of 3 female health operators with implanted copper IUDs, developing menometrorrhagia some months after an increase of the working time in a Magnetic Resonance Imaging (MRI) Unit (1.5 T), that progressively disappeared when the previous organization, involving discontinuous work shifts at MRI, was re-established. No known factors possibly related to menometrorrhagia were evidenced in the 3 operators, supporting the hypothesis of a role of the exposure to the electromagnetic fields (EMF) induced by the MRI system in symptoms induction. The possible mechanism remains unsettled, but menometrorrhagia might be triggered by a phlogistic stimulus caused by EMF, possibly the lowfrequency currents induced in the wires of the IUD during the movements of the operator inside the static magnetic field generated by the MRI permanent magnet. Until now, the problem of possible interactions between copper IUDs and EMF induced by MRI has been considered in patients undergoing imaging, but the possible risk in MRI Units operators has been largely neglected. To our knowledge, the occurrence of menometrorrhagia is not routinely checked in health surveillance of MRI operators, so these symptoms can pass unnoticed, especially if they are transitory. Therefore, underreporting is rather possible. The cases described here support the need for further research on this topic, especially considering the progressive diffusion of more powerful MRI scanners (3 T and more), and of the interventional magnetic resonance imaging, both potentially involving higher EMF exposures, and a large number of MRI female operators, possibly using IUDs. The possibility that MRI operators with implanted metallic IUDs can be included in the group of “workers at particular risk” according to the EU Directive 2004/40/EC should be considered.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2012, 25, 1; 97-102
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sediment transport beyond the surf zone under waves and currents of the non-tidal sea: Lubiatowo (Poland) case study
    Autorzy:
    Ostrowski, R.
    Stella, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241109.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    wave-induced nearbed oscillations
    sea currents
    wind-driven current
    sand grain diameter
    bed shear stress
    friction velocity
    sediment transport
    Opis:
    The paper deals with the sandy coastal zone at Lubiatowo in Poland (the south Baltic Sea). The study comprises experimental and theoretical investigations of hydrodynamic and lithodynamic processes in the coastal region located close to the seaward boundary of the surf zone and beyond the surf zone. The analysis is based on field data collected at the IBW PAN Coastal Research Station in Lubiatowo. The data consist of wind velocity reconstructed from the long-term wave climate, deep-water wave buoy records and sea bottom soil parameters. Nearbed flow velocities induced by waves and currents, as well as bed shear stresses are theoretically modelled for various conditions to determine sediment motion regimes in the considered area. The paper discusses the possibility of occasional intensive sediment transport and the occurrence of distinct sea bed changes at bigger water depths.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 1; 63-77
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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