Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
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Volume 67, Issue 2
Displaying 1-6 of 6 articles from this issue
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Greeting
Special Issue: “Symposium of the 63rd Annual Meeting of the Bulletin of the Society of Seawater Science, Japan”
Review
  • Generating Electricity with Marine Renewable Energy
    ─ Wave Power Generation ─
    Tomoki IKOMA, Koichi MASUDA
    2013 Volume 67 Issue 2 Pages 76-84
    Published: 2013
    Released on J-STAGE: September 17, 2014
    DOIhttps://doi.org/10.11457/swsj.67.76
    JOURNAL FREE ACCESS
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    Japan led the world in technical research and development into wave power converters until about 2000. Many people believe that wave energy can be utilized and that there are large amount of wave energy around the Japanese islands. This paper describes the development of wave energy converters in Japan. At first, it promotes the understanding of the wave power potential in Japan compared to the world, in particular the UK’s wave conditions. After that, it introduces different types of wave energy converters and details of each one. The purpose of the paper is to recognize the situation regarding wave energy utilization and exactly explain related matters. In Japan, although there is not plenty of wave power for electrical generation, there are several research projects on wave energy converters and development has progressed since the Fukushima accident in 2011. Very high performance devices under research. It is expected that wave power generation will be put to practical use in the near future.
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Commentary
General Paper
  • Fundamental Research on Structure and Functions of Ion Exchange Membranes
    Masao SUDOH
    2013 Volume 67 Issue 2 Pages 104-111
    Published: 2013
    Released on J-STAGE: September 17, 2014
    DOIhttps://doi.org/10.11457/swsj.67.104
    JOURNAL FREE ACCESS
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    This paper describes the measurements and theoretical analysis of transport properties based on inhomogeneity of the ion exchange membrane. According to the Tye model, the intramembrane structure of the ion exchange membrane is divided into an inert polymer phase, the polyelectrolyte phase and the pore phase. The pore phase is filled with outer solution, and the concentration in the polyelectrolyte phase is obedient to Boltzmann distribution. Donnan sorbed concentration in the membrane is estimated by using the Donnan equilibrium relationship for inhomogeneous charged membranes. The measurements of the membrane conductivity were conducted using different methods, and membrane conductivity was analyzed by using an inhomogeneous membrane model in comparison with a potential step method. Ionic transport of the ion exchange membrane is governed by diffusion, migration and convection. Since the fixed charges exist in the membrane, even when there is no electric current, an electric potential within the membrane is formed and affects ionic transport when the counterions with charges inversed to fixed charges travel through the membrane. In this paper, the Donnan dialysis concentration of cupric ions against hydrogen ions with the cation exchange membrane was analyzed using a macro-homogeneous membrane model, and diffusion dialysis of hydrochloric acid, sulfuric acid and phosphoric acid was analyzed using an inhomogeneous membrane model.
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