著者

山本 和久

出版者

日本物理教育学会

雑誌

物理教育 (ISSN:03856992)

巻号頁・発行日

vol.46, no.1, pp.23-25, 1998

参考文献数

2

被引用文献数

1

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大学新入生を対象に,「スペースシャトルと無重量状態」に関するアンケートを取ってみた。その結果,高校時代に物理学を履修していたか否かに関わらず,シャトルの中の「無重量状態」がなぜ起こるのか,多くの学生が誤った認識をしていることがわかった。彼らにとって,「宇宙」は依然として,地上とは別の不思議な現象が起こる世界なのである。

著者

山本和久三編

出版者

Y校同窓會

巻号頁・発行日

1937

著者

西田 武弘 藤原 康文 山本 和久 小泉 淳 八木 哲哉

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.140, no.2, pp.181-186, 2020-02-01 (Released:2020-02-01)

参考文献数

31

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Speckle reduction method for laser diode based displays was newly proposed. The method was based on temporal change of the active layer temperature which could be controlled by optimizing the driving condition of the laser diode under pulse. The red LD consisted of AlGaInP has low thermal conductivity and small energy difference between the active layer and the cladding one in the conduction band, resulting in the large temporal change of the lasing spectrum under the adequate driving condition in pulse. It indicates the speckle contrast could be controlled by changing the condition. The speckle contrast dependence on the driving condition of the high-power 638-nm lateral single mode laser diode was experimentally studied. In the experiment, not only the conventional square waveform but also the saw one were used. The speckle contrast under the adequate conditions for both waveforms was reduced approximately 25% compared with that under CW. In particular, the saw one might be expected as a very robust driving condition for the speckle reduction. This can be used with other speckle reduction method such as moving screen, moving diffuser and so on. In this sense, the newly proposal may be the speckle reduction method for “last one mile”.

著者

中村 賢二 山本 和久

出版者

一般社団法人 日本耳鼻咽喉科学会

雑誌

日本耳鼻咽喉科学会会報 (ISSN:00306622)

巻号頁・発行日

vol.80, no.7, pp.729-731, 1977

被引用文献数

2

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The patient was a 21-year-old man who acquired unilateral deafness while he was exposed to extremely loud sound of discotheque for about 4 hours.<br> His hearing type was of a dish, with a mean hearing loss of slightly over 50 dB in the middle frequencies. He was positive for recruitment phenomenon. No abnormal temporary threshold tone decay could be observed. He received treatment for approximately 2 months with slight improvement in hearing. Only 10 dB was elevated in frequencies of 500 Hz or below during treatment.<br> He had no subjective symptoms such as vertigo, dizziness and giddiness, nor any abnormal findings in equilibrium tests.<br> He was diagnosed as noise-induced sudden deafness caused by the sound of discotheque.