1 0 0 0 OA 日本の鉄鋼業における 連続鋳造技術の発展(I) -黎明期から低級鋼への工業的適用まで-
- 著者
- 河宮 信郎 山田 恭暉
- 出版者
- 日本科学史学会
- 雑誌
- 科学史研究 (ISSN:21887535)
- 巻号頁・発行日
- vol.27, no.167, pp.129-137, 1988 (Released:2021-09-06)
Research and experiments of continuous casting (CC) of steel in Japan were started in 1947. The first semicommercial facil ies were built in late 1950's with the intention of applying CC to quality special steels to which the CC technology had been supposed to be bestfit in consideration of yield ratio and energy economy. The CC for special steels, however, came to a standstill because the quality requirements to the final products were not fulfilled. Successful implementation of the CC took place firstly in the late 1960's, in production of low quality billets mainly for cement concrete reinforcing bars, where the CC worked as a labor-saving process. In parallel with the billet CC, large-section slabs for rather low grade steel plates began to be continuous-cast, where the CC worked as an energy-saving and capital-saving (enabling omission of blooming mill) process. The slab CC achieved a high productivity compatible to that of basic 'oxygen furnaces but still failed to meet the steel quality required for sheet production. Essential contribution to the development of the CC technology came from practical know hows and improved equipments brought about by above-mentioned industrial operation for low grade steels rather than by the so-called R&D in laboratories. A further development of the CC technology especially in regard with steel quality and comparative-historical consideration thereabout will be given in a subsequent paper
1 0 0 0 OA 成人T細胞白血病患者に合併した感染症の検討
- 著者
- 森内 幸美 山田 恭暉 朝長 万左男
- 出版者
- 一般社団法人 日本感染症学会
- 雑誌
- 感染症学雑誌 (ISSN:03875911)
- 巻号頁・発行日
- vol.66, no.10, pp.1444-1448, 1992-10-20 (Released:2011-09-07)
- 参考文献数
- 20
- 被引用文献数
- 6 3
成人T細胞白血病 (ATL) 患者の易感染性を確認するために, 最近10年間に当科に入院したATL患者 (112例) と類縁疾患である非ポジキンリンパ腫 (NHL) 患者 (109例) について, 合併した感染症の検討を行った.感染症を合併した症例は, ATLの80.4%, NHLの46.8%に認められ, 有意差を認めた (p<0.001).Documentedinfectionを合併した症例は, ATLの62.5%, NHLの27.5%に認められ, 有意差を認めた (p<0.001).個々の感染症については, 肺炎 (p<0.05), 膿皮症 (p<0.05), 真菌感染症 (p<0.05), Pneumocystis carinii肺炎 (p<0.05), サイトメガロウイルス感染症 (p<0.05), 単純ヘルペスウイルス感染症 (p<0.01) が有意にATL群に高頻度に認められた.結核症, リステリア症, サルモネラ感染症もATL群にのみ認められた.死因については, 2群間に有意差を認めなかった.
1 0 0 0 OA 坑井内同軸熱交換器を用いる地熱発電の予備的評価(II)
- 著者
- 盛田 耕二 藤田 勉 杉本 静哉 山田 恭暉 向井 良一
- 出版者
- THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN
- 雑誌
- 日本地熱学会誌 (ISSN:03886735)
- 巻号頁・発行日
- vol.14, no.1, pp.29-45, 1992-01-25 (Released:2010-02-05)
- 参考文献数
- 3
The purpose of this study was to clarify the level of thermal output per DCHE at which power generation using a downhole coaxial heat exchanger (DCHE) becomes economical. Another goal was to clarify the geothermal resources favourable for this system. The following conclusions are drawn in this paper: (1) When heat is transferred only by conduction in the formation as in Hot Dry Rock, the power generation sytem appears to be uneconomical. On the other hand, in the case of Hot Wet Rock where the convective heat transfer mechanism is dominant, there appears to be a greater possibility of the realization of this system. (2) In the case in which the estimated net thermal output after one year of operation was 10.4 MWt/DCHE, the adjusted mean power generation cost for 15 years of plant operation under the current subsidy system was estimated to be 16.4 Yen/kWh. In this case, the power generation system might become economical in the near future. Hence, under conditions similar to those assumed in this study, 10 MWt/DCHE of the net thermal output is though to be a good criterion for judging whether the system is practical or not. In order to investigate the possibility of the realization of this system and to clarify the favourable characteristics of the formation in further detail, it is essential to accumulate in-situ data carrying out heat extraction experiments in high temperature and permeable formation.