著者
三輪 誠 三村 治夫 阿部 晃久 西尾 茂 武田 実
出版者
The Japan Institute of Marine Engineering
雑誌
Marine engineering : journal of the Japan Institution of Marine Engineering = マリンエンジニアリング : 日本マリンエンジニアリング学会誌 (ISSN:13461427)
巻号頁・発行日
vol.44, no.3, pp.470-476, 2009-05-01
被引用文献数
2

Pathogenic and fecal bacteria, such as Vibrio cholerae and Escherichia coli, possibly invade via seawater. This may expose marine engineers to an intrinsic risk of infection when they carry out routine maintenance. We therefore investigated, following the voyage, the seawater taken into a ship's engine-room. As for the populations, they varied from 102.9 to 105.9 colony-forming units (cfu) ml-1. A correlation coefficient between the population and the in situ seawater temperature was 0.71, 0.30, and 0.068 for the samples taken from calls facing to the ocean (n = 6), the Inland Sea (n = 12), and the coastal area around the Pacific Ocean (n = 16), respectively. An occupational ratio of Vibrio sp. population increases when the seawater was retained for more than three months in the condensers for the air conditioner and the drain cooler. Although three strains were detected from the drain cooler, those of which had ability to make yellow-colored colonies on a selective plate at 37°C and left for 6 months. It was identified as to be Aerococcus viridans. In that species, the lobster pathogen is included, but nothing human. So far examined is pathogenic V. cholerae, which was not detected in all the samples taken from the engine-room. These results indicate that the possibility of infection of marine engineers to be quite low when they do the maintenance on board in the coastal area and the Inland Sea of Japan
著者
Qiusheng LIU Katsuya FUKUDA Takuma MATSUDA
出版者
The Japan Institute of Marine Engineering
雑誌
マリンエンジニアリング (ISSN:13461427)
巻号頁・発行日
vol.41, no.SI, pp.144-149, 2006-09-01 (Released:2010-05-31)
参考文献数
12
被引用文献数
5 4

Carbon dioxide (CO2) ocean sequestration technologies, such as dissolution into seawater, are important to mitigate global warming. In this study, solution processes of CO2 gas in seawater and pure water were experimentally studied under various pressures and temperatures to evaluate the solubilities of CO2 in seawater. The solubilities of CO2 in seawater and pure water were measured by a change in pressure due to absorption at pressures up to 30 MPa and the temperatures ranged from 4°C to 60°C. It was obtained that the solubilities of CO2 were between 0.27 × 10-3 and 1.26 × 10-3 in seawater, and between 0.26 × 10-3 and 0.6 × 10-3 in pure water near atmospheric pressure. The values increase with an increase in pressure, but decrease with an increase in temperature. The Henry's law constant of CO2 was about 105 MPa at a temperature of 4°C in seawater under atmospheric pressure, and increased with an increase in temperature. The solubility of CO2 in seawater was lower than that in pure water. Empirical correlations for solubilities of C02 in seawater and pure water at various temperatures under atmospheric pressure were obtained based on the experimental data.
著者
羽根田 誠 永井 義和 菅原 広 矢田部 孝 上井 博明
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
マリンエンジニアリング (ISSN:13461427)
巻号頁・発行日
vol.44, no.4, pp.627-630, 2009 (Released:2012-07-25)
参考文献数
4
被引用文献数
1

Although containerization of marine transportation has been bringing globalization to our daily life, it also triggered a dazzling development of technology on marine transportation side as well. Our daily life has become healthy via the development of transportation technology for such as fresh foods, and by use of the marine reefer container. Marine transportation technologies for fresh foods have been tackled with various techniques. We hereinafter introduce the transition technology for transportation by marine reefer container from the beginning of the container age until the present.