Sendai, Miyagi, Japan

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    ABSTRACT: Photoacoustic (PA) signal is very sensitive to noise generated by peripheral equipment such as power supply, stepping motor or semiconductor laser. Band-pass filter is not effective because the frequency bandwidth of the PA signal also covers the noise frequency. The objective of the present study is to reduce the noise by using an adaptive spatial filter with principal component analysis (PCA).
    Full-text · Article · Dec 2015 · Physics Procedia
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    ABSTRACT: The γ’ solvus temperature, the microhardness and the martensitic transformation temperatures were examined for the Fe-Ni-Co-Al-based shape memory alloys. It was found that Fe-28Ni-17Co-11.5Al-2X (X=Ti, Nb and Ta) alloys have a relatively high γ’ solvus temperature and that they show high hardness when aged at 600°C, especially in the case of Ta alloys. Alloy compositions to obtain a high hardness, a small transformation hysteresis and complete reversible transformation were evaluated as being Ni>28%, Co>13%, Al>10% and Ta>2.5%, and the most suitable aging temperature was 600°C. Grain boundary precipitation of the NiAl-B2 phase was found to be suppressed by the addition of over 0.03 at.% boron.
    Full-text · Article · Dec 2015
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    ABSTRACT: The 2011 tsunami induced sandy coast breaching in Akaiko area, Miyagi Prefecture, Japan. It also caused severe erosion of sand barrier-lagoon system adjacent to a river mouth on Sandai Coast in which Akaiko is located. These damages resulted in forming concave shoreline in these areas after the tsunami. The morphological recovery of this area is presented through analysis of aerial photography. In addition a new analytical solution of one-line model, which describes the evolution of shoreline of concave landform bounded by rigid boundaries, has been introduced. The recovery time of morphology is evaluated from the analytical solution of one-line model. Theoretical results indicate that coastal structures at both ends have major impact on the shoreline evolution. Moreover, the recovery time of the concave portion is highly depended on the total length of sandy coast on both sides. Good agreement between measured shoreline positions and simulated results is also obtained.
    Full-text · Article · Dec 2015 · Procedia Engineering

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  • Address
    Seiryo-machi 2-1, Aoba-ku, 980-8575, Sendai, Miyagi, Japan
  • Website
    http://www.tohoku.ac.jp/
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