Temporal coherence of acoustic signals in a fluctuating ocean

2011 ◽  
Vol 129 (6) ◽  
pp. 3590-3597 ◽  
Author(s):  
Alexander G. Voronovich ◽  
Vladimir E. Ostashev ◽  
John A. Colosi
Keyword(s):  
Acoustic Signals ◽  
Temporal Coherence

Temporal coherence of acoustic signals propagating through the near surface bubble layer

2002 ◽  
Vol 112 (5) ◽  
pp. 2424-2424
Author(s):  
R. Lee Culver ◽  
David Bradley ◽  
Jon Reeves
Keyword(s):  
Acoustic Signals ◽  
Temporal Coherence ◽  
Near Surface ◽  
Bubble Layer ◽  
Surface Bubble

Spatial-temporal coherence of acoustic signals propagating in a refractive, turbulent atmosphere

2014 ◽  
Vol 136 (5) ◽  
pp. 2414-2431 ◽  
Author(s):  
Vladimir E. Ostashev ◽  
D. Keith Wilson ◽  
Sergey N. Vecherin ◽  
Sandra L. Collier
Keyword(s):  
Turbulent Atmosphere ◽  
Acoustic Signals ◽  
Temporal Coherence

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

Temporal coherence of acoustic signals in range dependent background

2012 ◽  
Vol 131 (4) ◽  
pp. 3449-3449
Author(s):  
Yin Quan Zhang ◽  
Ning Wang
Keyword(s):  
Acoustic Signals ◽  
Temporal Coherence

Principle and practice of high-resolution imaging with a field-emission TEM

1992 ◽  
Vol 50 (1) ◽  
pp. 138-139
Author(s):  
Max T. Otten ◽  
Wim M.J. Coene
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Incidence Angle ◽  
Temporal Coherence ◽  
Energy Spread ◽  
High Resolution Imaging ◽  
Major Improvement ◽  
High Resolution Images ◽  
Resolution Imaging

High-resolution imaging with a LaB6 instrument is limited by the spatial and temporal coherence, with little contrast remaining beyond the point resolution. A Field Emission Gun (FEG) reduces the incidence angle by a factor 5 to 10 and the energy spread by 2 to 3. Since the incidence angle is the dominant limitation for LaB6 the FEG provides a major improvement in contrast transfer, reducing the information limit to roughly one half of the point resolution. The strong improvement, predicted from high-resolution theory, can be seen readily in diffractograms (Fig. 1) and high-resolution images (Fig. 2). Even if the information in the image is limited deliberately to the point resolution by using an objective aperture, the improved contrast transfer close to the point resolution (Fig. 1) is already worthwhile.

Classification of Fatigued Bills Based on a Support Vector Machine by Using the Amplitude Difference Features of Acoustic Signals

2011 ◽  
Vol 131 (8) ◽  
pp. 1495-1501
Author(s):  
Dongshik Kang ◽  
Masaki Higa ◽  
Hayao Miyagi ◽  
Ikugo Mitsui ◽  
Masanobu Fujita ◽  
...  
Keyword(s):  
Support Vector Machine ◽  
Acoustic Signals ◽  
Support Vector ◽  
Amplitude Difference
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