著者

長岡 和則 佐藤 昭二 山中 武 大西 由子

出版者

日本保健物理学会

雑誌

保健物理 : hoken buturi (ISSN:03676110)

巻号頁・発行日

vol.44, no.1, pp.66-71, 2009-03-01

参考文献数

20

被引用文献数

2

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In order to estimate the environmental radiation dose rate level, measurements of the terrestrial gamma ray dose rates and cosmic ray ionizing components were conducted in public places such as park, street and train in Tokyo area. Measurements for 10 s with a NaI(Tl) scintillation spectrometer were repeatedly carried out with walking. Terrestrial gamma ray dose rate ranges from 10 nSv/h in a train to 80 nSv/h on the stone road. Although cosmic ray ionizing component was constantly 30 nSv/h in the outdoor, reductions by shielding effect were observed at underground and in the concrete building. Influence of radiopharmaceutical was measured in the stations where so many people exist. This shows that the same effect may occur in the environmental radiation monitoring.

著者

柳原 敬 佐藤 昭二 多田 善一 大島 寛一

巻号頁・発行日

vol.34, no.2, pp.130-132, 1998 (Released:2012-08-07)

著者

柿嶌 眞 小野 義隆 福田 達男 佐藤 昭二

出版者

国立科学博物館

雑誌

国立科学博物館専報 (ISSN:00824755)

巻号頁・発行日

vol.34, pp.267-289, 2000

著者

長岡 和則 古渡 意彦 佐藤 昭二 虻川 成司 樋口 英雄 中村 尚司

出版者

Japan Health Physics Society

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.39, no.4, pp.352-361, 2004 (Released:2010-08-05)

参考文献数

28

被引用文献数

4 6

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Field measurements of the cosmic-ray neutron dose rate on the ground using the neutron dose-equivalent counter developed by Nakamura were conducted in order to allow an understanding of neutron dose rate distribution in Japan. The effects of altitude, geomagnetic latitude, snowfall and rainfall on the neutron dose rate were confirmed from the results of the field measurements. Altitude variation can be fitted to an exponential function (eαZ), where Z is altitude (km). The α value for the neutron dose rate increased with increasing geomagnetic latitude, 0.6-0.8(km-1) at latitudes 20°-40°. Roughly, α=0.01×L+0.4 (for Z under 2km), where L is the geomagnetic latitude(°). The effect of geomagnetic latitude on the neutron dose rate was approximately 2% per degree(°) at latitudes 20°-40° Reductions in neutron dose rate due to snowfall and rainfall are caused by a decrease in component backscattering from wet ground surfaces. The neutron dose rate (H*(10)) at sea level at a geomagnetic latitude near 25° in 2002 was approximately 4nSv/h, and the neutron dose rate obtained from the neutron energy spectrum up to 400MeV with the Bonner sphere counter developed by Uwamino was 5.7nSv/h. This difference may by due to the low sensitivity of the dose-equivalent counter to neutrons with energies above 15MeV.

著者

大内 茂人 劉 康志 佐藤 昭二 美多 勉

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.34, no.3, pp.225-231, 1998-03-31 (Released:2009-03-27)

参考文献数

7

被引用文献数

3

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Mine train control system is consisted of a winder, a train which transports many people to minebottom, and a long wire rope which connects a winder and a train. The mine train control system reported in this paper is the system with the longest rope of about 6700m in the world. This system often generate a rolling of train when the train stops at the station, when using conventional control. In convensional systems, two mine train control systems of the length of 1/2 of all mining galleries were used in order to ristrict the rolling. In these systems, change time was necessary. However, this change time become unnecessary by using a system with the length of 6700m. When using this system, it is the main subject how to control the bigger rolling. We solved the problem on the rolling control of this system by using H∞ control, and got the result that the travel time of the train made 2/3 compared with that of the convensional systems using two mine train control systems, and the train speed of 420m/min which is the maximum speed in the world was achieved.

著者

佐藤 昭二

出版者

東京教育大学農学部

雑誌

東京教育大学農学部紀要 (ISSN:05638275)

巻号頁・発行日

no.12, pp.1-64,図9p, 1966-02

著者

佐野 久 佐藤 昭二 金子 尚 谷本 泰

出版者

公益社団法人地盤工学会

雑誌

土質工学会論文報告集 (ISSN:03851621)

巻号頁・発行日

vol.18, no.2, 1978-06-15

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河口湖大橋における鋼製フローチングケーソン工法は, 鋼製ケーソンの製作と進水方法, 20mもある軟弱シルトの掘削法, 岩盤が一様でなく部分的に傾いている点, 岩盤掘削法などに問題があった。これらの問題を解決するため, 沈設にはケーソン沈下地点に固定さん橋, およびステージングを設けてジャッキ方式を採用し, 軟弱地盤の掘削は, 土質調査資料を基に行なった。また。傾きおよび滑動を防ぐため, 岩盤に接している刃口部付近の掘削を重点的に行ない, 高気圧中における削岩機の能力を停滞させないように注意し, 発破の掘削順序も効果のあがるよう工夫している。そして, 鋼製ケーソンの部材計算, ケーソンの組立て, 製作をはじめ, 装置, 作動方法, コンクリートの打設, 沈下, 管理, その他設備にいたるまで詳しく述べている。