著者
朴 洗憲 山崎 哲生 島田 荘平 山本 恭久
出版者
The Mining and Materials Processing Institute of Japan
雑誌
資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)
巻号頁・発行日
vol.118, no.10, pp.641-649, 2002-11-25
参考文献数
48
被引用文献数
3 3

Cobalt-rich manganese crusts on seamounts and manganese nodules on deep ocean floor have both been received attention as future resources for Co, Ni, Cu, and Mn. Lack of information on cobalt-rich manganese crusts has precluded comparisons between the two sources in terms of their technical and economical advantages. In the past 15 years, Japan has surveyed the cobalt-rich manganese crusts; therefore, it seems the proper time to compare the two. In this paper, we consider distribution features and R&D results to develop a method for examining and comparing the economical potentials of manganese nodule and cobalt-rich manganese crust mining. Through the preliminary evaluation of the two, the effectiveness of the method is confirmed. <BR>Cobalt-rich manganese crust development seems a risky but high return venture because of its high sensitivity to cobalt prices. Manganese nodule development, on the other hand, is considered to be a stable and good for a long-term venture. One of the application fields will be the selection of suitable metallurgical processing. A lower substrate ratio in excavated ore is clearly required for the economy of the crust development. In order to improve the evaluation, detailed technical information for the recovery efficiencies in the subsystems and units is necessary.
著者
山崎 哲 高本 正樹 細井 賢三 山崎 均 新井 悟司 清水 和義
出版者
一般社団法人日本機械学会
雑誌
日本機械学會論文集. B編 (ISSN:03875016)
巻号頁・発行日
vol.66, no.642, pp.619-626, 2000-02-25
参考文献数
12

The partial flow dilution method is one of the typical measurement methods for particulate matter emission from diesel engines. In this method, exhaust gas at a transient flow rate should be transferred to a dilution tunnel at a constant ratio of exhaust gas. The present partial flow dilution method is used under steady-state engine operating conditions in lieu of direct flow rate measurement of exhaust gas. A more practical control of exhaust emission is, however, required world widely; therefore development of an exhaust gas flowmeter is indispensable in the partial flow dilution method for transient engine operating conditions. An ultrasonic exhaust gas flowmeter has been developed and been demonstrated to be capable of measuring the exhaust gas flow rate with sufficient accuracy.
著者
坪田 浩乃 小守 伸史 高田 英裕 田村 俊之 浅井 文康 徳田 健 山崎 哲男 嶋 憲司 西川 博昭 寺田 浩詔
雑誌
全国大会講演論文集
巻号頁・発行日
vol.38, pp.1410-1411, 1989-03-15

データ駆動形プロセッサを実用化する上において、プログラム記憶のハードウェア規模の大きいことが一つの障害となっている。本報告では、プログラム記憶中の行き先ノード番号を相対アドレスで表現することにより、プログラム記憶サイズが大幅に圧縮可能であり、また、容易にマルチタスク環境が実現できることを示す。さらに、この方式を採用することによる、性能に対する影響についても評価を行った。