著者

角倉 敏彦 森 秀夫 三宅 隆雄

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.34, no.5, pp.334-339, 1965-05-10 (Released:2009-02-09)

参考文献数

11

被引用文献数

1

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Acoustic properties of foamed polymer are affected largely by its cell structure and, to a small extent, by chemical structure of polymer itself. In this paper, examination is made on the relation between acoustic properties and resistance to air flow which is a physical quantity related to cell structure. Acoustic impedance is measured with a standing wave apparatus under various. mounting conditions. Theoretical value of acoustic impedance for a porous material with rigid skeleton is compared with experimental result. For samples with small resistance to air flow, a good agreement is found over a wide range of frequency. When samples are stuck on a rigid wall with adhesive, the resonance occurs in the rigion between 500 and 1000 c/s.

著者

森 秀夫

出版者

日本教科教育学会

雑誌

日本教科教育学会誌 (ISSN:02880334)

巻号頁・発行日

vol.5, no.2, pp.93-98, 1980-04-30

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現在,世界的な規模で教師教育革新のための多くの試みが進められているが,特に,伝統的な教育実習についての問題が,多くの国々でとりあげられている。本論では,まず本学を中心として,戦前ならびに戦後の教育実習の歴史的な変遷をたどり,これに基づき,教育実習の新しい履習形態のあり方を検討したい。また,教科教育との関連のもとに,教育実習改善のための課題についても考察を進めたい。

著者

都能 和俊 橋本 幸太郎 山中 良太 有森 秀夫

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.75, no.2, pp.174-182, 2019 (Released:2019-02-20)

参考文献数

12

被引用文献数

3 2

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This study aimed to evaluate the effect of pulmonary arteriovenous computed tomography (CT) value and CT value difference on the pulmonary arteriovenous automatic extraction ability of a medical workstation. We classified patients who previously underwent contrast-enhanced CT as those with a pulmonary arteriovenous CT value difference of <50 Hounsfield unit (HU) and ≥100 HU. The groups were further divided into four subgroups each, with a total of eight groups, based on low pulmonary arteriovenous CT values of 200 or more and <250 HU, 250 or more and <300 HU, 300 or more and <350 HU, and 350 HU or more. A radiographer conducted a visual evaluation, and we judged whether it could extract pulmonary arteries A1–A10 and pulmonary veins V1–V10 without errors. When the CT value difference was <50 HU, the low pulmonary arteriovenous CT value of 200 or more and <250 HU significantly decreased the extraction ability compared with the ≥350 HU group (p<0.05), but when the CT value difference was ≥100 HU, no difference in the CT value was found. The pulmonary arteriovenous CT value and CT value difference affect the pulmonary arteriovenous automatic extraction ability of the medical workstation, but revision by the creator is necessary because misrecognition is included even if a CT value and CT value difference is high.