著者

河本 大地 劉 丹 馬 鵬飛

出版者

奈良教育大学

雑誌

奈良教育大学紀要. 人文・社会科学 = Bulletin of Nara University of Education. Cultural and Social Science (ISSN:05472393)

巻号頁・発行日

vol.68, no.1, pp.125-146, 2019-11-29

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History and present situation of Totsukawa Onsen, one of the three hot spring resorts in mountainous Totsukawa Village, Nara Prefecture, is examined in this paper. Totsukawa Onsen is a new hot spring resort that was established in 1963 when hot spring water was taken from the source in a steep valley to the lakeside of newly constructed Futatsuno Dam in Hiradani area where is the center of the commercial and service business function of Totsukawa Village. Managements of the accommodation facilities are specifically focused. As a result, it can be said that the development of this onsen made a great contribution to the economy of this village through tourism industries.

著者

山本 光夫 福嶋 正巳 劉 丹

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.97, no.3, pp.159-164, 2011-03-01 (Released:2011-03-01)

参考文献数

16

被引用文献数

16 17

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Barren grounds in coastal area are serious problems in Japan and throughout the world. Although several factors have been proposed to account for barren grounds, we have especially focused on lack of dissolved iron for restoring seaweed beds. It has been developed a method that the mixture of steelmaking slag and humus materials, such as composts, were supplied in seawater. A concentration of dissolved iron can be increased by using the method, since complexes, iron-humates, are produced from iron in steelmaking slag and humic substances in compost. In this study, we evaluated the effect of humic substances in this method for increasing dissolved iron concentration. A laboratorial iron elution test by using actual seawaters was attempted. Three kinds of samples for iron elution, only steelmaking slag, only humus materials, and a mixture of steelmaking slag and humus materials, were prepared. The change of iron concentration in each small tank had been monitored. We found that iron elution rate in the case of the mixture of steelmaking slag and compost was faster than that in the case of only steelmaking slag. Furthermore, it was expected that the characteristic of the structure of humic substances were related to increase iron elution from steelmaking slag. The mixture of steelmaking slag and humus materials was more effective not only for increasing iron concentration in seawater and but also for extending the life time of Fe elution.