著者
張 学超 森 敬祐 真壁 朝敏 井上 晋一 安藤 新二
出版者
公益社団法人 日本材料学会
雑誌
材料 (ISSN:05145163)
巻号頁・発行日
vol.70, no.6, pp.473-478, 2021
被引用文献数
1

<p>Push-pull fatigue tests of rolled magnesium alloys AZ31 and AZX912 were performed with a side-notch plate specimen to examine the effect of a single overload on the crack growth behavior under a stress ratio of -1. The behavior in retardation of crack growth was unclear in the case of AZ31 because the crack growth rate was relatively higher at the overload point. However, this was observed clearly, when the branching of the crack tip happened in the case of AZX912. The geometry of the fracture surface and the changes in crack growth path were related to the crack growth behavior. The crack opening level became higher when the crack growth rate was lower. Therefore, the crack closure is related to the retardation of the crack growth rate. When the branching of a crack tip occurred, not only the residual compression stress at crack front but also the variation of local crack growth direction after overload affected the fatigue crack growth behavior. </p>
著者
森 敬祐 真壁 朝敏 安藤 新二 井上 晋一
出版者
一般社団法人 日本高圧力技術協会
雑誌
圧力技術 (ISSN:03870154)
巻号頁・発行日
vol.58, no.1, pp.14-21, 2020

Fatigue crack growth tests of rolled magnesium alloy AZ31 were performed with a side-notch plate specimen under negative mean stress conditions. In the results of the present study, even if the experimental conditions were the same, the crack growth behavior varied depending on the condition of the specimen and depending on the microstructure. The local friction between large size and small size crystals and the shear deformation are expected to be related to the crack closure. The crack growth rate was affected by the crack opening stress. When the crack growth rate was lower level, the crack closure behavior worked due to the plastic deformation and the roughness of the fracture surface. There was local rough pattern which work as the shear lip at sides of the crack surface.
著者
井上 晋一 髙田 光雄
出版者
日本建築学会
雑誌
日本建築学会計画系論文集 (ISSN:13404210)
巻号頁・発行日
vol.82, no.738, pp.1881-1891, 2017

&nbsp;In the current Japanese urban areas, bonds of local residents have been dilutive, under the influence of low birthrate, aging, personalization of life, and diversification of values. After Great Hanshin-Awaji Earthquake, these problems become obvious, and there has been a growing demand to regeneration of neighborhood community.<br>&nbsp;The purpose of this study is to explore the way of planning of open type dwelling unit to activate the community. This paper examines the relationship between the dwelling unit plan and the formation of territory on 3-dimensional streets in case of the experimental housing "NEXT21". Especially, focusing the "Visual connection" between a living room and a 3-dimensional street, we analyzed the spread of personal areas on 3-dimensional streets.<br>&nbsp;If there is a "Visual connection" between a living room and a 3-dimensional street, it caused the "intermediate space" with the device in the vicinity of the boundary. The device is the invitational design technique, also the exclusive design technique. Due to differences in the arrangement of the "intermediate space", they were classified into five types of "Visual connections" between a living room and a 3-dimensional street. To target the dwelling unit that has direct "Visual connection", we analyzed "Areas of comfortable" and "Areas to be worried about if there are strangers". "Areas of comfortable" are recognized as the private areas of proceeds. "Areas to be worried about if there are strangers" are recognized as the areas visible from the familiar life spaces.<br>&nbsp;If the living room of the dwelling unit is spread in the "intermediate space", "Areas to be worried about if there are strangers" are formed in the areas of "Visual connection" with not only the living room but also the "intermediate space". Furthermore, "Areas of comfortable" are formed in the areas of the invitational quality. However, "intermediate space" having a large opening prevents the formation of "Areas of comfortable" under the influence of the exclusive quality.<br>&nbsp;Through analysis, we were able to see how the private areas spread the living room to the "intermediate space" and 3-dimensional streets in stages. Simply not only to pursue the securing of privacy, but also it is necessary to perform open type dwelling planning in the hope that the community will be formed after a few years. There, it is important that "intermediate space"s become cores of communication, and connect in three dimensions by "Visual connections".
著者
高橋 洋平 井上 晋一郎 島崎 研一郎
出版者
植物化学調節学会
雑誌
植物の生長調節 (ISSN:13465406)
巻号頁・発行日
vol.43, no.2, pp.135-143, 2008-12-19

気孔は一対の孔辺細胞から構成され,光によって開口し植物ホルモン(アブシシン酸,ジャスモン酸など)によって閉鎖し,植物と大気間のガス交換を調節している.孔辺細胞はシグナルとして作用する青色光をフォトトロピンを介して受容し,化学情報への変換,細胞膜H^+-ATPaseの活性化,内向き整流性K^+チャネルによるK^+の取り込み等の過程を経て気孔開口を引き起こす.一方,孔辺細胞はアブシシン酸や二酸化炭素を受容し,多くの情報伝達体からなるネットワークを通して,細胞膜陰イオンチャネルを介したイオンの遊離によって気孔閉鎖を誘発する.気孔の開口および閉鎖に関与する情報伝達因子,それらを制御する蛋白質リン酸化反応,さらに,独立した経路と考えられた気孔開口と閉鎖の両経路間のクロストークの解明が進んでいる.