IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
Volume 139, Issue 1
Displaying 1-19 of 19 articles from this issue
Special Issue on Technology 2019: Review of Fundamentals and Materials Research
Special Issue Review
Paper
  • Shinji Yasui, Shohei Suzuki, Kunihiko Koike
    2019Volume 139Issue 1 Pages 24-29
    Published: January 01, 2019
    Released on J-STAGE: January 01, 2019
    JOURNAL FREE ACCESS

    N2O gas is a causative substance of global warming, and it must reduce the discharge to the atmosphere. We have been developing the compact type of plasma reactor for decomposing the exhaust gas of N2O. We fabricated the fixed-bed-type plasma reactor filling mixture of an alumina wool and an activated carbon, and the decomposed experiments were conducted. The filling ratio of the activated carbon was greatly influence on the decomposition ratio of N2O.

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  • Takefumi Kaji, Hiromitsu Asai, Hiroki Kojima, Naoki Hayakawa
    2019Volume 139Issue 1 Pages 30-37
    Published: January 01, 2019
    Released on J-STAGE: January 01, 2019
    JOURNAL FREE ACCESS

    We investigated the combined effect of temperature and humidity on partial discharge inception voltage (PDIV) of magnet wires under repetitive surge-wave voltages. As the results, the PDIV increased as the temperature increased in the environment of uncontrolled humidity, which is peculiar under surge-wave voltage. On the other hand in the environment of controlled humidity, the PDIV decreased monotonically as the temperature increased. We found that the PDIV increase was attributed to the effect of the relative humidity decrease corresponding to the temperature increase. Furthermore, the PDIV was also influenced by the water amount in insulation film. The PDIV during the temperature increase was lower than that during the temperature decrease with the hysteresis. The lower PDIV at the higher water amount is due to the release of water into the air gap as well as the decrease in the first ionization energy of insulation film, leading to the increase in the generation probability of an initial electron.

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  • Fumitaka Aki, Tonthat Loi, Hajime Saito, Noboru Yoshimura, Kazutaka Mi ...
    2019Volume 139Issue 1 Pages 38-44
    Published: January 01, 2019
    Released on J-STAGE: January 01, 2019
    JOURNAL FREE ACCESS

    The aim of this paper is to clarify the treatable distance of Ferromagnetic Implant with Low Curie Temperature (FILCT), superparamagnetic nanoparticles Resovist® (Resovist) and the mixture of FILCT and Resovist (Reso-FILCT) as heating elements by using a wireless temperature measurement induction heating system for hyperthermia under a constant temperature environment of 37℃. In this experiment, a high-frequency magnetic field was applied to the three heating elements and their temperature and the superimposed voltage were measured every 1.0 cm up to 6.0 cm until the temperature of heating element no longer exceeds 45℃ even after 300 seconds passed. As a result, it was clarified that the treatable distance of FILCT is within 1.0 cm, the temperature of Resovist is difficult to control, and the treatable distance of Reso-FILCT is within 5.0 cm. Furthermore, it was revealed that Reso-FILCT has an initial temperature rising rate of 3.6 times and a change in superimposed voltage of 1.28 times than that of FILCT. From this point, we considered that wireless temperature measurement induction heating system using Reso-FILCT as heating element is useful for clinical application.

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