Results 291 to 300 of about 7,623,084 (334)

A powerful acoustical source for seismology

The Journal of the Acoustical Society of America, 1995
To get information about the ‘‘entrails’’ of the Earth it is necessary to have a powerful source of seismic waves. Standard equipment for this purpose is too heavy and rather unstable. In this work the possibility of powerful electrodynamic hydroacoustic transducer usage for seismology is investigated theoretically.
Andrey V. Lebedev, Alexander M. Sutin
openaire   +1 more source

Acoustic power flux in a waveguide

Acoustical Physics, 2001
The acoustic power flux that occurs in an ideal waveguide in the presence of two modes propagating in it is considered. Singular points of the saddle and vortex types are found for modes of different numbers. The regions lying near the vortex-type points and characterized by the inverse direction of the power flux (i.e., from the receiver to the source)
V. A. Eliseevnin, Yu. I. Tuzhilkin
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Method of determination of acoustic power

Fibre Chemistry, 2008
Analytical and empirical data are used for determining the acoustic power of industrial noise, which allows taking into consideration the design features of the parts of machines. This will assist in solving the important problem of noise reduction and design of sound insulation.
openaire   +1 more source

High sensitivity detection of partial discharge acoustic emission within power transformer by sagnac fiber optic sensor

IEEE transactions on dielectrics and electrical insulation, 2018
Partial discharge acoustic detection is an important monitoring tool for power transformer diagnosis, which was traditionally performed by mounting the piezoelectric transducers on the oil tank surface.
Sen Qian, Hao Chen, Yang Xu, Lei Su
semanticscholar   +1 more source

Acoustic emission caused by the failure of a power transistor

2015 IEEE Applied Power Electronics Conference and Exposition (APEC), 2015
The authors show for the first time that acoustic events are related to the failure of transistors. An experimental setup is presented, that was used to make a sample of 26 insulated gate bipolar transistors (IGBT) to fail. The acoustic events in the transistors were monitored. It was discovered that two distinct types of acoustic events are related to
Tommi J. Karkkainen, Joonas P. Talvitie, Mikko Kuisma, Pertti Silventoinen, Elena Mengotti   +4 more
openaire   +1 more source

Acoustical power amplification and damping by temperature gradients

The Journal of the Acoustical Society of America, 2011
Ceperley proposed a concept of a traveling wave heat engine [“A pistonless Stirling engine—The traveling wave heat engine,” J. Acoust. Soc. Am. 66, 1508–1513 (1979).] that provided a starting point of thermoacoustics today. This paper verifies experimentally his idea through observation of amplification and strong damping of a plane acoustic traveling ...
Tetsushi, Biwa, Ryo, Komatsu, Taichi, Yazaki   +2 more
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High-power acoustic insult to cells as studied by acoustic microscopy

2001 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.01CH37263), 2002
A plurality of articles discussing combined effects of acoustic high-pressure and heat caused by acoustic vibration on biological tissues and cells has been introduced. Herein, we contribute the first article describing the use of a blunt impact caused by high-power ultrasonic pulses for insulting living human skin cells, wherein the impact does not ...
C. Miyasaka, R. Halter, B.R. Tittmann, W. Hymer, N. Nicholas   +4 more
openaire   +1 more source

Acoustic Markers of Political Power

Journal of Psycholinguistic Research, 1997
The effect of political power on acoustic variables was examined in three political speeches given by Francois Mitterrand at different periods of his career. F 0 data were not found to reflect the extent of Mitterrand's power.
openaire   +1 more source

Acoustic Scene Analysis Based on Power Decomposition

2006 IEEE International Conference on Acoustics Speed and Signal Processing Proceedings, 2006
A method is proposed for the analysis of acoustic scenes. The contribution of each competing source is suppressed on the basis of harmonic structure or cross-sensor correlation, in such a way that other sources may be estimated. Successive suppression of sources allows the scene to be characterized. In the limit of purely periodic sources and no noise,
Alain de Cheveigné, Michael Slama
openaire   +1 more source

Ultra-low-power acoustic imaging

Proceedings of the 20th Annual International Conference on Mobile Systems, Applications and Services, 2022
Yang Bai 0009, Nakul Garg, Nirupam Roy
openaire   +1 more source