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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 6
Displaying 1-6 of 6 articles from this issue
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Tsutomu NAKAOKA2008 Volume 62 Issue 6 Pages 258-264
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThis paper describes the performance analysis of the Integrated Hybrid Ocean Thermal Energy Conversion (I-H OTEC) system and an oceanographic investigation for effective utilization of ocean thermal energy offshore of Tsushima Island which is one suitable site proposed for the I-H OTEC system. We made oceanographic observations in the area north west of Tsushima Island in August, October, and December of 2005; July, August, October, and November of 2006; and August, September, October, and November of 2007 to obtain physical and chemical data (water temperature, salinity, dissolved oxygen, nutrients), as well as topographic data using a research ship of the National Fisheries University, which is necessary for designing the I-H OTEC system. A conventional design for the I-H OTEC system is being conducted with these data. The total heat transfer area of heat exchanger per net power is used as an objective function. Numerical results are reported for a 1,000 kW I-H OTEC system with plate-type heat exchangers and ammonia as a working fluid. The objective function obtained is 10.1m2/kW when the warm sea water inlet temperate is 28.7°C and cold sea water inlet temperate is 4.1°C.View full abstractDownload PDF (4285K) -
Mitsuyoshi HIRAI, Katsuyuki Gomi, Osman Ahmed HAMAD, Takaji AKIYA2008 Volume 62 Issue 6 Pages 265-270
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA concept for novel NF/RO/MED hybrid desalination is described in this paper. A pilot plant for a hybrid desalination method whose desalination capacity was 1 m3/h was constructed. Stable operation of the pilot plant was achieved and Top Brine Temperature (TBT) reached 125°C, which was a world record. The preliminary conceptual design was also carried out. From this conceptual design, energy conservation characteristics were discovered.View full abstractDownload PDF (3859K) -
Tomoya TSUJI, Yoshitaka YAMAMOTO, S. P. KANG2008 Volume 62 Issue 6 Pages 271-277
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSUp-to-date information on methane hydrates was reviewed from the view point of new energy in the ocean. At first, a history of hydrate discovery was briefly introduced. The phase diagram and the crystal unit structure were classified by considering the cavity of water cages and that of the guest molecules. The distribution on the earth, the depth of the sediments containing methane hydrates, and the estimated mass of methane hydrate were theoretically discussed by considering the phase diagram of methane+water. The origin of natural gases was divided into two types, biogenic and thermogenic. Then, the identification and measuring of gas composition and isotope contents were introduced. Finally, the activity of a national project named“The Research Consortium for Methane Hydrate Resources in Japan”and our contribution were also described, and the exploitation programs at the seabed in the offshore of Honshu island, Japan, were considered.View full abstractDownload PDF (4616K) -
Izuru KAKUTA, Kana TANANO2008 Volume 62 Issue 6 Pages 278-285
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe influence of the oral administration of oxytetracycline (OTC) and immune-enhancing agents such as lactoferrin (LF), fucoidan (Fu) and γ-oryzanol (γ-OR) on the intestinal flora of Japanese flounder, Paralichthys olivaceus, were examined. Slight changes in the intestinal flora of fish with the oral administration of OTC were observed. However, it was found in this group that the ratio of OTC resistant bacteria to total intestinal bacteria was elevated significantly. In the intestine of LF-, Fu- and γ-OR-treated fish, both decreases in Streptococcus sp. and Enterobacteriaceae and an increase in Vibrio sp. were shown. In the fish administered Vibrio anguillarum (afamous pathogenic bacterium for fish) with and without LF, LF suppressed the number of Enterobacteriaceae and V. anguillarum in fish intestine. It also gave fish on extended survival time and restrained the amount of bacteria in hepatopancreas and spleen tissues in V. anguillarum-treated fish. The results suggest that the utilization of immuno-enhancing agents such as LF, Fu and γ-OR is better compared to that of antibiotics such as OTC for the prevention and the treatment of infectious diseases in hatchery fish.View full abstractDownload PDF (7070K) -
Yuka NAKAYAMA, Yumi MAKABE, Junro TANII2008 Volume 62 Issue 6 Pages 286-291
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe effect of the bittern content of various edible salts on miso quality was examined. The pH, color value, moisture content, sugar and amino acid and aerobic plate, lactic acid bacterial, and yeast counts of miso were measured. The pH, a value and glucose content were lower when using salt with a high bittern content. However, the moisture content and amino acid of the miso after 194 days were lower when using salt with an intermediate bittern content. The bacterial counts were equivalent in all the salts tested. In addition, a sensory evaluation was conducted to determine the strengths of saltiness, aroma and taste and preferences for aroma, color and taste of miso and miso soup. Although the strengths of these were lower when using salt with a high bittern content, the preferences for miso soup were equivalent for all the salts tested. From these results, it was concluded that the effect of the bittern content of various edible salts on miso quality is small.View full abstractDownload PDF (3528K) -
Hiroshi TAKIYAMA, Yohei YAMANE2008 Volume 62 Issue 6 Pages 292-293
Published: 2008
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSSalt crystallization should be carried out under high suspension conditions in order to maintain global competitiveness. However, excessive micro-crystals are generated under such conditions. In this study, the effects of injection methods of dissolution water on the number of micro-crystals were investigated in order to control CSD (crystal size distribution). As the results show, it was clear that local undersaturation was concerned with the dissolution phenomena of micro-crystals and the injection strategies of dissolution water were proposed.View full abstractDownload PDF (1448K)
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