Communication among hamsters by high-frequency acoustic signals: II. Determinants of calling by females and males.

1977 ◽  
Vol 91 (4) ◽  
pp. 807-819 ◽  
Author(s):  
Owen R. Floody ◽  
Donald W. Pfaff ◽  
Catherine D. Lewis
Keyword(s):  
High Frequency ◽  
Acoustic Signals

Acoustic Signals Analysis Based on Empirical Mode Decomposition and Spectrum Analysis Technique

2010 ◽  
Vol 40-41 ◽  
pp. 91-95 ◽  
Author(s):  
Yan Li Zhang
Keyword(s):  
Empirical Mode Decomposition ◽  
High Frequency ◽  
Acoustic Signals ◽  
Intrinsic Mode Functions ◽  
Mode Decomposition ◽  
Analysis Technique ◽  
Marginal Spectrum ◽  
Rock Interface ◽  
Coal Rock ◽  
Instantaneous Energy

A method to analyze the acoustic signals collected in fully-mechanized caving face is presented in this paper. Through analyzing the marginal spectrum and frequency spectrum of intrinsic mode functions obtained by empirical mode decomposition, acoustic signals’ frequency and amplitude characteristics are gotten, that is, high frequency signals about 1000Hz ~2800Hz are produced when the top coal is combined with gangue. Furthermore, the acoustic signals’ instantaneous energy spectrums in the frequency range of 1000Hz ~2800Hz can be used to identify the coal-rock interface.

scholarly journals High‐frequency acoustic signals for condition monitoring

1976 ◽  
Vol 60 (S1) ◽  
pp. S14-S14
Author(s):  
M. Darlow ◽  
O. Shinaishin ◽  
L. Winn
Keyword(s):  
Condition Monitoring ◽  
High Frequency ◽  
Acoustic Signals

Exploratory Experiments to Determine Flow and Structure Borne Noise of Erosive Cavity Implosions

Volume 3 ◽  
2004 ◽  
Author(s):  
Evert-Jan Foeth ◽  
Gert Kuiper
Keyword(s):  
Quantitative Analysis ◽  
High Frequency ◽  
Pressure Transducer ◽  
Acoustic Signals ◽  
Noise Signal ◽  
Visual Observation ◽  
Sheet Cavitation ◽  
Impact Noise ◽  
Per Se ◽  
The Impact

In two exploratory setups, a high-frequency pressure transducer has been used to determine both the flow and the structure borne noise above 200 kHz. In the first set of tests the impact noise due to a single bubble is investigated in order to gain insight in the acoustic signals emitted by an imploding bubble. A quantitative analysis of the signals indicates a short and clear acoustic signal in the fluid and a long chiming signal in the structure. In the second set of tests the noise signal emitted by sheet cavitation implosion on a hydrofoil is acquired. The convoluted signals of individual bubbles can be identified both in the fluid and in the structure. Analyses of the signals by examining the peak distribution for sheet cavitation indicates a relation with the cavitation index and suggest that fluid and structure borne noise are not per se linked. Acoustic signals correlate well with visual observation.

Temporal coherence and time spread of ocean surface scattered high‐frequency acoustic signals

2001 ◽  
Vol 110 (5) ◽  
pp. 2635-2635
Author(s):  
Steven Lutz ◽  
David Bradley ◽  
R. L. Culver ◽  
Joe Keranen ◽  
Jon Reeves
Keyword(s):  
High Frequency ◽  
Ocean Surface ◽  
Acoustic Signals ◽  
Temporal Coherence ◽  
Time Spread

The Use of Sub-Bottom Profiler in the Surveying of Embankments’ Foundation

2010 ◽  
Vol 36 ◽  
pp. 162-166
Author(s):  
Rui Wang ◽  
Yuan Bao Leng ◽  
Chang Zheng Li
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
Yellow River ◽  
Acoustic Signals ◽  
Acoustic Imaging ◽  
Underwater Acoustic ◽  
Key Points ◽  
Series Of Experiments ◽  
Civil Engineers

Sub-bottom profiler is a kind of underwater acoustic imaging equipment. It can scan the sub-water stratums with acoustic signals and presents the section imaging. The frequency rang and transmitting power are key points to choice a suitable profiler. Generally, high frequency means high resolution and small imaging range. Transmitting power affects the imaging range also. Sub-bottom profiler can tell hydraulic and civil engineers what the embankments’ foundation like, especially the distribution of enrockments. With these information, engineers can evaluate the safety of embankments and decide what to do to keep them standing strong. A typical profiler called X-Star and a series of experiments carried on Yellow River, the famous sediment-laden and the 2nd longest river of China.

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