THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN
Online ISSN : 2432-2040
Print ISSN : 0369-4232
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Volume 15, Issue 3
Displaying 1-9 of 9 articles from this issue
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  • Measurements of Young's Modulus of "Mylar" Polyester Film
    Kiichiro Matsuzawa
    Article type: Article
    1959Volume 15Issue 3 Pages 147-150
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_147
    JOURNAL FREE ACCESS
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    The Young's modulus of the 1 mil "Mylar" C polyester film was measured in a frequency range of 100 to 4000 c/s as a function of temperature, together with the study of the symptom of dependency on directions of the film. The frequency dependence of the Young's modulus has been found to be almost inappreciable. It has also been found that the values of the Young's modulus in dyne/cm^2 are 5. 2×10^&lt10&gt at 15℃ and 3. 3×10^&lt10&gt at 90℃ in the maximum direction, while 4. 2×10^&lt10&gt at 15℃ and 2. 8×10^&lt10&gt at 90℃ in the minimum direction. The variation of the Young's modulus with static tension was measured at 15℃ and 251 c/s which was found to be very small.
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  • Study of the Flow Patterns in Peripheral Arteries by Ultrasonics
    Shigeo Satomura
    Article type: Article
    1959Volume 15Issue 3 Pages 151-158
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_151
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    When an ultrasonic beam is radiated into the bloodvessel by a transducer placed on the surface of the skin, the reflected waves are produced from the blood-flow. Hence they can be detected as a kind of tone by means of a sensitive receiver. Because the intensity and the frequency character of this tone is proportional to the velocity of the blood-flow, it is possible to investigate the behavior of the blood-flow through this method. Tones are consisted of two kinds, one of them being produced by the carotid arterial system while the other produced by the limbs arterial system. The author suggests to make a diagnosis of Arterial sclerosis utilizing this method.
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  • Research on the Precision Sound-Energy Flux meter
    Kiyoshi Awaya, Isamu Yokoyama, Atsushi Shirahata, Masaru Ito
    Article type: Article
    1959Volume 15Issue 3 Pages 159-172
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_159
    JOURNAL FREE ACCESS
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    A sound-energy flux-meter applicable for accurate measurements is discussed. Its microphone head consists of two pressure microphones of nearly same characteristics; the voltage e_v proportional to the particle velocity v is obtained by time integration of the difference in voltage of the two microphone outputs. As the sound-energy flux density P is defined by the time average of p×v, the sound energy flux-meter must necessarily contain a multiplier such as the electronic wattmeter. The authors used a phase sensitive detector of new type as the multiplier, to construct a instrument with the accuracy of 2-3 %.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1959Volume 15Issue 3 Pages 173-183
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_173
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1959Volume 15Issue 3 Pages 184-188
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_184
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1959Volume 15Issue 3 Pages 189-191
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_189
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1959Volume 15Issue 3 Pages 191-193
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_191
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1959Volume 15Issue 3 Pages 193-199
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_193
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1959Volume 15Issue 3 Pages 200-203
    Published: September 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.3_200
    JOURNAL FREE ACCESS
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