巻号一覧
27 巻, 2 号
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
-
山本 武夫原稿種別: 本文
1971 年 27 巻 2 号 p. 71-79
発行日: 1971/02/10
公開日: 2017/06/02
ジャーナル フリーThis paper shows that a microphone with oblate unidirectional pattern which is semi-circular directional in horizontal plane and hypercardioid directional in vertical plane, can be obtained by combining two directional microphones via a 90-degree phase difference network. In this paper: deviations from the oblate unidirectional pattern caused by differences in sensitivities, directivities, directions of the principal axes of the two microphones, and the angle of the phase-difference network are discussed. Experimental microphones were constructed from a stereophonic coaxial microphone consisting of two varidirectional capacitor microphones. This oblate unidirectional microphone has the semi-circular directional pattern in horizontal plane, 8o that it can be used effectively for a group discussion in television programs. The microphone is less influenced by the reflections from the table as compared with the ordinary unidirectional microphone, because the microphone has small sensitivity in upward and downward directions.抄録全体を表示PDF形式でダウンロード (776K) -
宇野 武彦原稿種別: 本文
1971 年 27 巻 2 号 p. 80-86
発行日: 1971/02/10
公開日: 2017/06/02
ジャーナル フリーA measurement of ultrasonic attenuation in bonding layer of an ultrasonic delay line is proposed. The method is based on the. fact that the reflection coefficient R and transmission one T of an ultrasonic cave at a bonding layer depend on the attenuation in the layer. Thus, the ultrasonic attenuation in a bonding layer can be determined by measuring R and T. The coefficients of R and T are measured through the use of light diffraction phenomenon due to acoustic waves. The results of the measurement of attenuation constants of transverse waves are reported for several bonding materials.抄録全体を表示PDF形式でダウンロード (653K) -
鈴木 辰男原稿種別: 本文
1971 年 27 巻 2 号 p. 87-94
発行日: 1971/02/10
公開日: 2017/06/02
ジャーナル フリーThis paper describes theoretical calculations of the electro mechanical coupling factor of the rectangular piezoelectric bimorph vibrator inserted with an elastic plate in several cases. By neglecting the widthward stress as usual, the coupling factor of bending type bimorph was obtained in a simple form, and it was also the same with the twister type bimorph. Exact solution was obtained which takes into consideration the stress in width direction as well as space charge between electrodes and it was compared with the above approximate solution. Further, the coupling factor of the asymmetric type , bimorph was calculated and was compared with that of the symmetric bimorph.抄録全体を表示PDF形式でダウンロード (690K) -
長谷川 高陽原稿種別: 本文
1971 年 27 巻 2 号 p. 95-104
発行日: 1971/02/10
公開日: 2017/06/02
ジャーナル フリーThe acoustic-radiation pressure due to incident plane progressive wave is computed for isotropic solid spheres, air bubbles and liquid spheres freely suspended in non-viscous fiuids. With respect to solid spheres in water, the elasticity dependency of radiation pressure is investigated using Hasegawa-Yoshioka's theory. It is found that the peaks and minima of the radiation-pressure curve tend to become more pronounced as the density or the sound velocity of material decreases, and that the deviation from the rigid-sphere solution becomes less prominent as poison's ratio decreases for ordinary solids. It is concluded that material such as beryllium is more suitable for ultrasonic-intensity measurement in water than a steel sphere or the like. The acoustic-radiation pressure on fluid spheres is computed using Yoshioka-Kawashima's theory. The radiation-pressure for mercury sphere in water, particularly, shows a series of minima as in the case of solid spheres.抄録全体を表示PDF形式でダウンロード (746K) -
原稿種別: 付録等
1971 年 27 巻 2 号 p. 104-
発行日: 1971/02/10
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (23K) -
庄司 光原稿種別: 本文
1971 年 27 巻 2 号 p. 105-113
発行日: 1971/02/10
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (1221K)
- |<
- <
- 1
- >
- >|