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pro vyhledávání: '"William A. Lester"'
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 33:1196-1199
The dissipationless theory for harmonic generation in an initially sinusoidal, plane, finite‐amplitude wave is used as a basis for calculation of the harmonic components of such a wave in a fluid with dissipation. The assumption used is shown to le
Autor:
Roy R. Whymark, William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 48:671-675
The plastic‐flow threshold in pure nickel is measured under the combined action of various ultrasonic and static loadings. It is found that the ultrasonic vibrations, and combinations with static loading, are much more effective in producing flow t
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 40:847-851
The fundamental‐frequency component of a plane, finite‐amplitude wave is measured in water at 5.65 Mcps by a fixed‐distance pulse method giving variable‐distance results. The absorption coefficient of the fundamental‐frequency component of
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 50:142-142
The properties under high drive conditions of disk specimens of whisker reinforced composite ceramics are compared with the similar properties of commercially available nonreinforced ceramics of the same general family. The ceramics are of the lead z
Autor:
William W. Lester, Roy R. Whymark
Publikováno v:
The Journal of the Acoustical Society of America. 48:100-100
The process of inducing plastic flow in metals under the combined action of static and large vibratory stresses using a high‐powered horn driver is discussed. In particular, where the metal is ferromagnetic, one has the situation that many properti
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 40:1260-1260
Ultrasonic waves have been produced in samples of various glasses by passing a Q‐spoiled laser beam through the sample. The ultrasonic waves were observed at a frequency arbitrarily chosen as 266 kc/sec, but in general they consist of a broad spect
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 34:1991-1991
A new method for the measurement of the frequency components of a finite‐amplitude wave has been devised which makes use of fixed‐distance measurements. A 2‐transducer pulse technique has been developed so that the problems of alignment and tra
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 33:857-857
An optical diffraction method for the pressure calibration of pulsed ultrasonic transducers in transparent media is discussed. Results are presented which compare this method with optical calibration by means of continuous waves. As an example of the
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 38:931-931
Autor:
William W. Lester
Publikováno v:
The Journal of the Acoustical Society of America. 35:1894-1894
A method for the measurement of the second‐harmonic component of a plane, finite‐amplitude wave as a function of the distance has been devised that makes use of fixed‐distance measurements in a two‐transducer pulsed system. The fixed‐distan