著者
東 照正 竹内 徹也
出版者
公益社団法人 応用物理学会
雑誌
応用物理 (ISSN:03698009)
巻号頁・発行日
vol.67, no.10, pp.1142-1145, 1998-10-10 (Released:2009-02-05)
参考文献数
13

正常な赤血球の静磁場(最高8T:テスラ)での配向を顕微鏡観察と光学的測定でとらえた.“生の赤血球”はその円盤面を磁場に平行に配向する.これはおもに細胞膜の脂質二重層や膜貫通タンパク質の反磁性磁気異方性によるものであり,細胞内のヘモグロビンは関与しない.一方,タンパク質分子間の架橋剤であるグルタルアルデヒドの作用で“硬化した赤血球”は円盤面を磁場に垂直に配向する.これは細胞膜にわずかに結合しているメトヘモグロビンの強い常磁性磁気異方性のためと考えられる.赤血球の動きは磁場に印加後5秒以内で平衡に達するが, 1Tの磁場強度で影響を受け始め, 4Tでほぼ完全に配向する.
著者
吉敷 祥一 山田 哲 竹内 徹 鈴木 一弁 岡田 健 和田 章
出版者
日本建築学会
雑誌
日本建築学会構造系論文集 (ISSN:13404202)
巻号頁・発行日
vol.69, no.575, pp.113-120, 2004
被引用文献数
10 10

Many steel structures suffered damage at beam-to-column connections under the Northridge and Hyogo-ken Nanbu Earthquakes more than 8 years ago. After these earthquakes, a remarkable number of studies have been made on beam-to-column connections in U.S. and Japan. Nevertheless, in those studies, little attention has been paid to the point of repairing. The purpose of this study is to propose new ductile steel structure frame system, which realizes not only structural performances but also easy repairing after heavy earthquake. This system is based on bolted connections with split-tee. Main feature of this system is to limit plastic deformation to the splittee at bottom flange. To the contrary, the split-tee at top flange can be kept in elastic, because the center of rotation stays at the top flange of beam end.Consequently, when the structure using this system suffers compulsory deformation under the earthquake, the deformation concentrates on the split-tee at bottom flange. Finally, two series of static tests were conducted. First series are axial loading tests of the weak-web-split-tee elements, and second series are bending tests of beam-to-column connections having weak-web-split-tee. From the result of these tests, we verified that this system had efficient deformation capacity. In addition, the damaged part of this system would.be easy to repair or change to new one.
著者
寺澤 友貴 周磨 幸一 岩永 将信 前原 智 竹内 徹
出版者
一般社団法人 日本建築学会
雑誌
日本建築学会技術報告集 (ISSN:13419463)
巻号頁・発行日
vol.26, no.64, pp.899-904, 2020-10-20 (Released:2020-10-20)
参考文献数
6

Grid-purlin system composed of RHS members are known to be effective to prevent buckling of the welded beams. In this paper, lattice dome composed of radial beams and welded grid purlins (Grid purlin shell dome) are studied. The linear, elastic, and elasto-plastic buckling strength of Grid purlin shell domes are analyzed using detailed FEM analyses. Their results are compared with the shell theory with continuum analogy and easy design approaches are investigated.
著者
竹内 徹 堀内 健太郎 松井 良太 小河 利行 今村 晃
出版者
日本建築学会
雑誌
日本建築学会構造系論文集 (ISSN:13404202)
巻号頁・発行日
vol.79, no.703, pp.1309-1319, 2014-09-30 (Released:2014-09-30)
参考文献数
16
被引用文献数
5 5

Although truss towers used for telecommunication, electric power transportation, supporting structures for smokestacks in power plants have been designed against wind loads, a higher level of safety is recently required because of the increase of anticipated large seismic inputs. The ultimate strength of these structures is governed by tubular member buckling which is easily led to member fracture. This paper proposes the post-fracture analysis methods for truss structures composed with tubular members of large diameter-to-thickness ratios, and study on the collapse mechanism of such truss towers after the buckling and fracture of main columns and diagonals are investigated, using IDA analyses taking these member fractures into account.