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Volume 62 (2008)
- Issue 6 Pages 258-
- Issue 5 Pages 234-
- Issue 4 Pages 179-
- Issue 3 Pages 128-
- Issue 2 Pages 72-
- Issue 1 Pages 3-
Volume 62, Issue 2
Displaying 1-9 of 9 articles from this issue
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Masami HASEGAWA2008 Volume 62 Issue 2 Pages 72-75
Published: 2008
Released on J-STAGE: February 19, 2013
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Toshio HAMANO2008 Volume 62 Issue 2 Pages 76-78
Published: 2008
Released on J-STAGE: February 19, 2013
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Naohito YOSHIKAWA, Tetsushi FUCHIWAKI2008 Volume 62 Issue 2 Pages 79-84
Published: 2008
Released on J-STAGE: February 19, 2013
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The Present Status and the Subjects for Future IndustrializationKenta OOI2008 Volume 62 Issue 2 Pages 85-89
Published: 2008
Released on J-STAGE: February 19, 2013
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Yuji HATADA2008 Volume 62 Issue 2 Pages 90-92
Published: 2008
Released on J-STAGE: February 19, 2013
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Daisuke FUJITA2008 Volume 62 Issue 2 Pages 93-95
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDeep seawater (DSW), pumped from deeper than 200 m, has been used in our life and industries in Japan for twenty years. The author termed this trend as the Renaissance of seawater utilization culture. Seawater is the most abundant, recycling and mineral-rich water on the earth, among which DSW is additionally characterized by the four (or five) natures: coldness, cleanliness, abundant nutrient and little fluctuation (and ripeness). Production of marine bioresource is probably the only usage in which these characteristic natures are fully utilized. The coldness has developed the ecology and culture of cold current or deep water fish and shellfish as well as the stable production of shallow water species by mainly cooling in summer. Enriched nature (and ripeness) is useful in algal production. Clean nature not only reduces the disease but also keeps free from fouling in pipes and tanks. Stability of water quality simplifies the culture techniques and reduces the mass mortality. In spite of some endemic problems (e.g., cost of heating), application of DSW in marine bioresource production is particularly attractive and contribute to the development of local industry when well organized and combined with other activities (e.g., process of the products, sightseeing).View full abstractDownload PDF (2348K) -
Tomoya TSUJI, Michica OTAKE, Taro KAWAMURA, Toshihiko HIAKI, Yoshitaka ...2008 Volume 62 Issue 2 Pages 96-103
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSMethane hydrate has been pald much attention as a new natural resources and an alternative energy for crude oil or liquefied natural gas, and huge amount of methane hydrate was distributed under the deep seabed in the offshore of Japan. The knowledge of density of clathrate hydrate is essential for recovering natural hydrate resources. Then, a new flow type apparatus for the density measurement of hydrate slurry was developed. An oscillation U-tube densimeter was equipped with the apparatus. In the measurements, water and liquefied guest molecule were continuously supplied by two pumps to mix up liquid-liquid equilibrium like emulsion. In pre-cooling line, the phase transition was occurred, and the slurry, aqueous solution + hydrate, was prepared. The slurry was successively sent into the oscillation U-tube densimeter. Then, the apparent density of the slurry can be measured. Prior to the measurements, plugging up concentration was estimated by use of phase diagram and percolation theory. Because of the formation of continuous solid phase at the percolation threshold, it causes the lost of fluidity and plugging up in the flow line. In our previous study, the apparent densities were successfully obtained for tetrahydrofuran (THF), propane and carbon dioxide hydrate slurry. In this paper, experimental procedure and model calculation were described for carbon dioxide slurry. The technique can be applied not only for the determination of the lattice parameter in clathrate hydrate, but for a sensor to avoid plugging up in boring tube or pipeline.View full abstractDownload PDF (5717K) -
Koji MASAOKA, Tomohiko KARUBE, Akio NAKAMURA2008 Volume 62 Issue 2 Pages 104-111
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe composition of concentrated seawater obtained by the ion exchange membrane method in a salt making factory was modeled, and a concentration experiment on the concentrated seawater was carried out. When the sodium chloride purity of the brine were the range of 87 to 93%, the salts deposited in order of sodium chloride, calcium sulfate, and potassium chloride at 50, 70 and 90°C. And the prediction model for the concentration of each ion contents in the solutions of concentrating process was proposed. The prediction model could easily simulate the composition of the mother liquor in the crystallizer used in a salt making factory and the concentration characteristic value concerning productivity in salt making process, such as a sodium chloride deposit rate, was also able to be acquired.View full abstractDownload PDF (4762K) -
Mohammad Sazzad HOSSAIN, Shigeru OHDE, Kentaro TANAKA, Sittipun SIRIRA ...2008 Volume 62 Issue 2 Pages 112-113
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSTo elucidate the skeletal growth of a Porites coral from the Gulf of Thailand, oxygen isotope ratio (δ18O) in coral aragonite was measured by mass spectrometry. Two cyclic changes in δ18O were observed from the coral sample analyzed every 1mm from the top to a depth of 40mm. A cyclic change in δ18O is assumed to record an annual change in seawater salinity, and the coral growth rate is estimated at -20mm/year.View full abstractDownload PDF (1436K)
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