著者
小野田 滋 司城 能治郎 永井 彰 菊池 保孝
出版者
Japan Society of Civil Engineers
雑誌
日本土木史研究発表会論文集 (ISSN:09134107)
巻号頁・発行日
vol.9, pp.245-254, 1989-06-20 (Released:2010-06-15)
参考文献数
10

This paper describes the past and present state of railway tunnels, based on field surveys and historical records. In this second report the objects selected are the former Kyoto Ry. and Hankaku Ry., which were constructed to link Keihanshin district with Maizuru area in the 1890s, and the structural features of the tunnels on these railways are made clear here. These two companies were established with similar intentions, in similar periods, on a similar scale; later purchased by the National Railways of Japan, and now the greater parts of the lines have discontinued services upon completion of new lines. These tunnels are found very valuable as monuments to brick or masonry structures of the Meiji Era.
著者
永井 彰一郎 關谷 道雄
出版者
無機マテリアル学会
雑誌
石膏 (ISSN:21854343)
巻号頁・発行日
vol.1950, no.1, pp.37-41, 1950-09-30 (Released:2010-08-05)
参考文献数
45
著者
荒井 康夫 永井 彰一郎
出版者
無機マテリアル学会
雑誌
石膏と石灰 (ISSN:21854351)
巻号頁・発行日
vol.1963, no.67, pp.245-252, 1963-11-01 (Released:2011-03-07)
参考文献数
3

Observation were made on the mechanism of formation of forsterite in MgO-SiO2 system reactions and the transformation of the crystal lattice of forsterite accompanying the displacement of Mg2+ in the lattice by Fe2+ of varing amount in order to scrutinize the course of formation of olivine, which is known as a component mineral of serpentine rock and various slags. It was confirmed by this study that Fe2+ dissolves at first when olivine is dissolved with an acid. This rapid dissolution of Fe2+ was attributed to the larger affinity of Fe2+ to an acid solution than Mg2+. 10 kinds of silicate minerals related with MgO-SiO2 system were then synthesized to study on the relation between the structure of silicate and its acid solubilities. It was concluded that the acid solubilities of CaO-SiO2 system is rather high because the polarization effect of Ca2+ is smaller than that of Mg2+ and that this acid solubility is more with CaO-MgO-SiO2 system, which has dissolved Mg2+, because the clearance in the structure is larger, and that the acid solubilities of silicates are dependent on the polymerization degree of silicate ions which constitute the silicate and, consequently, orthosilicates with island structure is most soluble.
著者
永井 彰 吉田 麗生 諸橋 玄武
出版者
一般社団法人電子情報通信学会
雑誌
電子情報通信学会技術研究報告. SITE, 技術と社会・倫理 (ISSN:09135685)
巻号頁・発行日
vol.110, no.114, pp.147-152, 2010-06-24

本稿では, 部分一致検索可能暗号の実装方法を検討し,実装を行った結果を報告する.部分一致検索可能暗号は内積述語暗号から構成するため,内積述語暗号の実装評価からその評価が可能である.しかし,内積述語暗号ではベクトルの次元が演算時間に大きく影響を与えてしまい,演算時間の評価はケースごとになってしまう.そこで内積述語暗号の下位演算と演算回数から計算時間を見積もり,その結果と,実測値と比較を行った.これにより,曲線によっては演算回数からおおよその検索時間を見積もれることがわかった.