著者

玉田 正男 瀬古 典明 笠井 昇 清水 隆夫

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.5, no.4, pp.358-363, 2006-12-25 (Released:2010-01-21)

参考文献数

12

被引用文献数

51 54

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Uranium cost in the annual collection of 1, 200t-U from seawater was evaluated by using the recovery system of braid type adsorbents synthesized by radiation-induced graft polymerization. The total cost was calculated by summating those in the processes of adsorbent production, uranium recovery, and elution and purification. When the adsorbent performance increased from 2g-U/kg-adsorbent (ad) to 6g-U/kg-ad, the cost of each process decreased in the same way. The increment of adsorbent durability of 6 times to 60 times reduced the process cost of adsorbent production especially. In the current state of 2g-U/kg-ad and 6 times usage of adsorbent, the uranium from seawater cost 90, 000yen/kg-U. The uranium cost becomes 25, 000yen/kg-U in the promising performance of 4g-U/kg-ad and 18 times usage of adsorbent.

著者

清水 隆夫 玉田 正男

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.20, pp.617-622, 2004 (Released:2011-06-27)

参考文献数

5

被引用文献数

8 8

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The density of uranium in the seawater is only 3 mg/m3, but its total amount is 4.5 billion tons. In the last report, the braid type adsorbent was proposed with its mooring system for the collection of the uranium from the sea. And, it was shown that a high performance of the adsorbent and a big fall in weight of the mooring system are feasible and there's no problem of the adhered creature. In this report, it is shown that 134 km2 of mooring basin is needed for annual product of 1200 tons of uranium. In addition, 6000 km2 and over of suitable basin for the collection of the uranium is shown between Okinawa Islands and Tosa Bay.

著者

瀬古 典明 笠井 昇 清水 隆夫 玉田 正男

出版者

日本海水学会

雑誌

日本海水学会誌 (ISSN:03694550)

巻号頁・発行日

vol.59, no.5, pp.316-319, 2005 (Released:2013-02-19)

参考文献数

5

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A braid adsorbent having the functional group of amidoxime is a promising material for the recovery of uranium (U) dissolved in the seawater. This long braid adsorbent was made by polyethylene multi-fibers in which amidoxime groups were introduced by radiation-induced graft polymerization and a subsequent chemical treatment. The braid adsorbent obtained was moored at the offing of Okinawa Island. The average U adsorption of the adsorbent became 1.5g-U/kgadsorbent for 30d soaking.The mooring system for braid adsorbent has possibility which reduced the cost for the recovery of U from seawater. Annual product of 1,200 tons of U needs 134km2of mooring area. In addition, there is 6,000 km2 and more of suitable sea area for the collection of the U in the regions from Okinawa Islands to Tosa Bay in Japan.

著者

西田 修三 中辻 啓二 宮本 豊尚 清水 隆夫 坂井 伸一 松山 昌史 坪野 考樹

出版者

公益社団法人 土木学会

雑誌

海岸工学論文集

巻号頁・発行日

vol.52, pp.1441-1445, 2005

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大阪湾奥部においてDBF海洋レーダーを用いた流況観測を実施し, 収集されたデータを基にレーダーの特性を明らかにするとともに, 沿岸域の表層流動構造に及ぼす出水や風の影響について解析を行った. また, 台風時の観測データを用いて, レーダーによる波浪情報の推定についても, その適用性を検討した. その結果, 日スケールの流況には出水や風の影響が現れるが, 15日間の残差流には, 吹送流の影響はほとんど見られなかった. また, 台風接近時のレーダーのスペクトルデータを用いて海上風や波高の推定を行ったところ良好な結果が得られた. しかし, 風速5m/s以下ではS/N比の低下により波浪情報の抽出は困難となり, 20m/s以上では計測レンジの低減が生じることが明らかとなった.