A New Approach To Cement Evaluation Using Passive Acoustic Methods Directly Analyses The Performance Of The Barrier By Detecting Leakage Rather Than Its Physical Presence And Apparent Condition

2019 ◽  
Author(s):  
Duncan Troup
Keyword(s):  
New Approach ◽  
Acoustic Methods ◽  
Physical Presence ◽  
Passive Acoustic

scholarly journals Passive acoustic methods for tracking the 3D movements of small cetaceans around marine structures

PLoS ONE ◽  
2020 ◽  
Vol 15 (5) ◽  
pp. e0229058 ◽  
Author(s):  
Douglas Gillespie ◽  
Laura Palmer ◽  
Jamie Macaulay ◽  
Carol Sparling ◽  
Gordon Hastie
Keyword(s):  
Marine Structures ◽  
Acoustic Methods ◽  
Passive Acoustic

Local habitat use by botos (Amazon river dolphins,Inia geoffrensis) using passive acoustic methods

2015 ◽  
Vol 32 (1) ◽  
pp. 220-240 ◽  
Author(s):  
Yukiko Yamamoto ◽  
Tomonari Akamatsu ◽  
Vera M. F. da Silva ◽  
Shiro Kohshima
Keyword(s):  
Habitat Use ◽  
Amazon River ◽  
Acoustic Methods ◽  
Inia Geoffrensis ◽  
Passive Acoustic ◽  
Local Habitat

scholarly journals Introduction to thermoacoustic Stirling engines: First steps and praxis

2021 ◽  
Vol 313 ◽  
pp. 08005
Author(s):  
Carmen Iniesta ◽  
José Luis Olazagoitia ◽  
Jaime Gros ◽  
Jordi Vinolas ◽  
Javier Aranceta
Keyword(s):  
Energy Recovery ◽  
Power Flow ◽  
Energy Analysis ◽  
Theoretical Study ◽  
Acoustic Power ◽  
Theoretical Level ◽  
New Approach ◽  
Stirling Engines ◽  
Passive Acoustic ◽  
Design And Manufacture

The work focuses on the theoretical study and design of Thermoacoustic Stirling-Like Cycle Engines. One of the main goals of this study is to describe the application of a methodology for energy analysis and optimization of thermoacoustic devices. This new approach avoids complicated mathematical treatments, facilitates access to this fascinating technology for all audiences. The presented methodology is based on the distribution of the active and reactive acoustic power flow according to the passive acoustic circuit. In addition, this methodology allows optimizing the device by comparing different acoustic circuits. This method is evaluated at a theoretical level with the models and simulations developed, for each of the case studies described. Besides, this publication shows the praxis from the first steps, so the reader is guided in the design and manufacture of a compact Stirling thermoacoustic energy recovery engine, operating in laboratory conditions. The resulting demonstrator is itself an academic tool for knowledge transfer.

Passive Acoustic Array Harbor Security Applications

2011 ◽  
Vol 45 (3) ◽  
pp. 103-110 ◽  
Author(s):  
John Gebbie ◽  
Martin Siderius ◽  
John S. Allen
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Water Environment ◽  
Open Circuit ◽  
Security Applications ◽  
Vertical Arrays ◽  
Detection And Tracking ◽  
Acoustic Methods ◽  
Remote Environment ◽  
Acoustic Array ◽  
Passive Acoustic

AbstractHarbor security and protection of maritime assets are issues of increasing concern. Outstanding research questions exist in terms of the optimal protection methodology needed for the wide variety of surface and submerged threats and diverse geographical locations. Economic costs and environmental concerns are also significant overriding issues. Acoustic methods have the advantage of being amenable to tracking and detecting targets both above and below the ocean surface. Moreover, passive acoustic methods are nonintrusive and capable of covering extensive ranges. Acoustic arrays offer significant advantages in terms of gain and signal processing capabilities over discrete, single hydrophones. We investigate the use of horizontal and vertical arrays for the detection and tracking of a remote environment monitoring system (REMUS) autonomous underwater vehicle as well as open-circuit divers in a noisy, shallow water environment. Using conventional beamforming techniques, we obtain positive preliminary results for detection and tracking, which highlight the overall merits of an acoustic array implementation.

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