Results 21 to 30 of about 46,952 (245)

The effects of sound propagation and avoidance behaviour on naval sonar levels received by cetaceans [PDF]

, 2012
The use of active sonar is deemed to be essential for naval operations, but its potential impact on marine life has raised concerns worldwide. In a risk-assessment framework, characterisation of risk of harm is accomplished by combining exposure ...
Wensveen, Paul J.
core   +2 more sources

PROSPECTS FOR THE USE OF COMPOSITE RESISTORS IN THE HARDWARE OF INFORMATION AND MEASUREMENT SYSTEMS

Надежность и качество сложных систем, 2022
Background. Non-wire resistors are one of the most popular types of radio components. Their number in modern radio equipment reaches more than one third (40 %) of the total number of all resistors.
A.Yu. Dorosinskiy, O.V. Prokof'ev, I.Yu. Semochkina   +2 more
doaj   +1 more source

SDNet: Image‐based sonar detection network for multi‐scale objects

IET Image Processing, 2023
Autonomous Underwater Vehicle (AUV) carrying sonar for object detection has become one of the main ways of ocean exploration. However, object detection in sonar images always faces the problems of balancing detection accuracy and efficiency. To this end,
Pengfei Shi, Huanru Sun, Yuanxue Xin, Qi He, Xiaotian Wang   +4 more
doaj   +1 more source

DSM Sonar Software [PDF]

, 2020
Post-processing of sonar data is a common task in ocean science. This includes the creation of bathymetric maps, the use of seafloor backscatter information to determine sediment types as well as the analysis of water column data, e.g. for the assessment
Weiß, Tim, Greinert, Jens
core   +1 more source

Beaked whales respond to simulated and actual navy sonar [PDF]

, 2011
This article is distributed under the terms of the Creative Commons Public Domain declaration. The definitive version was published in PLoS One 6 (2011): e17009, doi:10.1371/journal.pone.0017009.Beaked whales have mass stranded during some naval sonar ...
Christopher W. Clark, Walter M. X. Zimmer, DiMarzio Nancy, Boyd Ian L., Durban, John W., Durban John W., Brandon L Southall, Moretti, David, Tyack, Peter L., Claridge Diane E., DiMarzio, Nancy A., Angela D'Amico, Peter L. Tyack, Ian L. Boyd, David Moretti, D'Amico, Angela, Ward, Jessica, John W Durban, Ward Jessica, Zimmer Walter M. X., Walter M X Zimmer, McCarthy, Elena, Peter L Tyack, Jessica Ward, Clark Christopher W., Brandon L. Southall, D'Amico Angela, Boyd, Ian L., Claridge, Diane E., Moretti David, Jarvis, Susan, Ian L Boyd, Morrissey, Ronald, Southall Brandon L., John W. Durban, Clark, Christopher W., Susan Jarvis, Nancy DiMarzio, Morrissey Ronald, Diane E. Claridge, Ronald Morrissey, Tyack Peter L., Zimmer, Walter M. X., Jarvis Susan, Southall, Brandon L., Christopher W Clark, Elena McCarthy, Moretti, David J., DiMarzio, Nancy, Diane E Claridge, McCarthy Elena   +50 more
core   +1 more source

A blind contour‐aware quality model for sonar images

IET Image Processing, 2022
Since the penetration depth of visible light is limited in muddy and dark deep marine environment, sonar imaging, which is independent of natural light, has been attracting much attention in underwater detections.
Weiling Chen, Rongfu Lin, Rongxin Zhang, Yi Zhu   +3 more
doaj   +1 more source

Adaptive Hoyer-L-Moment Envelope Spectrum: A Method for Robust Demodulation of Ship-Radiated Noise in Low-SNR Environments

Sensors
Propeller noise is the main source of ship-radiated noise. Extracting and analyzing the modulation characteristics from the propeller noise plays a crucial role in classifying and identifying vessel targets.
Ruizhe Zhang, Qingcui Wang, Shuanping Du
doaj   +1 more source

APPLICATION OF PHYSICAL AND TECHNICAL METHODS FOR IDENTIFYING WIRE RESISTORS’ FAILURES CAUSES

Известия высших учебных заведений. Поволжский регион:Технические науки, 2020
Background. The object of the study is the failure of wire resistors caused by various types of defects in parts, components, and materials used in the production of resistive sensors.
A. Ju. Dorosinskij
doaj   +1 more source

Active sonar target recognition method based on multi‐domain transformations and attention‐based fusion network

IET Radar, Sonar & Navigation
The classification and recognition of underwater targets by an active sonar system remain challenging and complex. Traditional methods have limited classification performance in time and spatially varying ocean channels.
Qingcui Wang, Shuanping Du, Wei Zhang, Fangyong Wang   +3 more
doaj   +1 more source

An Active Sonar Signal Detection Algorithm Based on Weighted Neighbourhood Relative Entropy in the Underwater Acoustic Noise Environment

Journal of Marine Science and Engineering
This paper presents a target detection method for active sonar based on weighted neighbourhood relative entropy (WNRE), using tools from information geometry.
Ken Cheng, Jiaxi Cheng, Fangyong Wang, Xinyu Gu, Shuanping Du   +4 more
doaj   +1 more source