著者
安孫子 誠也
出版者
一般社団法人日本物理学会
雑誌
日本物理學會誌 (ISSN:00290181)
巻号頁・発行日
vol.57, no.2, pp.121-122, 2002-02-05
参考文献数
6
著者
宮沢 弘成
出版者
一般社団法人日本物理学会
雑誌
日本物理學會誌 (ISSN:00290181)
巻号頁・発行日
vol.57, no.2, pp.123-125, 2002-02-05
参考文献数
4
著者
Hideo SUZUKI
出版者
ACOUSTICAL SOCIETY OF JAPAN
雑誌
Acoustical Science and Technology (ISSN:13463969)
巻号頁・発行日
vol.21, no.3, pp.163-166, 2000 (Released:2001-01-31)
参考文献数
2
被引用文献数
2 4

A single-degree-of-freedom(SDOF) system with a mass(m), a spring(k), and a damping(c) is a basic mechanical system.It is well known that a complex mechanical system is represented by a combination of infinite number of SDOF systems.The modal analysis theory is based on this principle, but only one type among various types of SDOF systems is presently employed for a modeling of complex systems.When one needs to estimate m, k, and c of a SDOF system from the measurement of the resonance frequency and the loss factor, the relationships between them must be exactly known.Those relationships are known for commonly used SDOF systems, but those for rather unfamiliar types are not known.In this technical report, various types of SDOF systems and their equivalent electrical circuits are listed, and equations that relate the resonance frequencies to the undamped resonance(natural) frequencies and the loss factors are given.It is also shown that, for some type of SDOF systems, some cares must be taken how to interpret the loss factor.
著者
朴 容石 飯田 浩二 向井 徹 桜井 泰憲
出版者
日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.61, no.2, pp.159-163, 1995-03-25
被引用文献数
3

The auditory threshold levels of walleye pollock Theragra chalcogramma (Pallas) were measured in order to determine the optimum conditions for marine ranching utilizing underwater sound. The auditory characteristics of walleye pollock were determined by heart beat conditioning using 8 frequencies of pure tone stimuli from 60 to 1, 000Hz coupled with an electric shock. Pure tone conditioning stimuli were presented to the fish for 5 seconds with a 0.1 second 12V DC electric shock applied 3 seconds after the start of the sound projection. The positive response to the pure tone stimulus of the conditioned fish consisted of an inhibition of one or more heartbeats. Results show that tested walleye pollock are sensitive to pure tones in the frequency range from 60 to 1kHz, with greatest sensitivity in the range from 120 to 200Hz. At the most sensitive frequencies, the mean thresholds were between 97.7 and 100.2dB (re 1μPa) under a background noise level between 55 and 75dB (re 1μPa/√Hz). Hearing ability declined gradually with increasing frequency above 400Hz. The upper limit of audible frequency is believed to be about 1kHz.

1 0 0 0 RNA biology

出版者
Landes Bioscience
巻号頁・発行日
0000
著者
濱井 健人 隅山 孝夫 鈴木 元 吉田 英弘
出版者
愛知工業大学
雑誌
愛知工業大学研究報告. A, 基礎教育センター論文集 (ISSN:03870804)
巻号頁・発行日
vol.38, pp.21-29, 2003-03-31

2つのn次正方行列A,BがAB=E_nをみたせば必然的にBA=E_nとなることはよく知られた事実である。このことの証明は,行列式を用いて大学初年級程度の線形代数学の知識の範囲内でできる。しかしこの命題は本来行列式とは無関係であり,より一般的な代数学の定理から導くことができる。この論文においては,上の命題を系として含む一般的な代数学の定理を提示する。同時に,工学部系の数学教育では扱い難い環と圏の理論を,上述のことに関連させて教育内容とし得ることを示す。この論文は,愛知工業大学情報通信工学科平成12年度と平成13年度の卒業論文(参考文献[2],[6])を発展させたものである。