Results 41 to 50 of about 4,968,542 (275)

Underwater Acoustic simulations with a time variable acoustic propagation model [PDF]

, 2010
The Time Variable Acoustic Propagation Model (TV-APM) was developed to simulate underwater acoustic propagation in time-variable environments. Such environment variability induces a strong Doppler channel spread, which is an important factor to test and ...
Silva, A., Jesus, S. M., Huillery, J., Zabel, F., Rodríguez, O. C.   +4 more
core   +1 more source

Bioinspired Adaptive Surfaces for Intelligent Liquid Manipulation: Progressing From Passive and Active to Hybrid Strategies

Advanced Materials, EarlyView.
This review examines passive, active, and hybrid liquid manipulation strategies, highlighting hybrid approaches as an emerging route to reconcile energy efficiency with adaptive control. By actively reconstructing passive surfaces to store programmable interfacial energy, hybrid systems enable flexible yet low‐power liquid transport, with perspectives ...
Jiaqi Miao, Yiyuan Zhang, Liqiu Wang, Alan C. H. Tsang   +3 more
wiley   +1 more source

Prediction Method of Underwater Acoustic Transmission Loss Based on Deep Belief Net Neural Network

Applied Sciences, 2021
The prediction of underwater acoustic transmission loss in the sea plays a key role in generating situational awareness in complex naval battles and assisting underwater operations. However, the traditional classical underwater acoustic transmission loss
Yihao Zhao, Maofa Wang, Huanhuan Xue, Youping Gong, Baochun Qiu   +4 more
doaj   +1 more source

Breaking the Surface: Buoyant Metal–Polymer Open–Cell Hybrid Lattice Metamaterials

Advanced Materials, EarlyView.
Open‐cell metal–polymer lattice metamaterials that defy sinking. (a) Injection process of the polyurethane (PU) foam into the titanium (Ti‐6Al‐4V) hollow‐strut lattice creating the open‐cell Ti‐6Al‐4V+PU hybrid lattice, (b) flotation test of a hybrid lattice specimen, and (c) a digital representation and experimental validation of a marine buoy ...
Jordan Noronha, Joey Tallon, Raad Omar, Jason Dash, Andrey Molotnikov, Martin Leary, Milan Brandt, Ma Qian   +7 more
wiley   +1 more source

Employing feedforward backpropagated neural network for Doppler scale estimation in underwater acoustic CP-OFDM communication

Scientific Reports
Orthogonal frequency division multiplexing (OFDM) is a promising solution for underwater acoustic communication (UWA); however, it requires careful handling of the challenges of large multipath and severe Doppler effects inherent in underwater acoustic ...
Muhammad Muzzammil, Shahzad Saleem, Niaz Ahmed, Gang Qiao, Ayman Alharbi   +4 more
doaj   +1 more source

Sensor Network Architectures for Monitoring Underwater Pipelines

Sensors, 2011
This paper develops and compares different sensor network architecture designs that can be used for monitoring underwater pipeline infrastructures. These architectures are underwater wired sensor networks, underwater acoustic wireless sensor networks, RF
Imad Jawhar, Jameela Al-Jaroodi, Nader Mohamed, Liren Zhang   +3 more
doaj   +1 more source

Modified Green's Functions for Shallow Water Acoustic Wave Propagation [PDF]

, 2004
This article presents an assessment of alternative forms of the Green’s function for boundary element simulations of acoustic wave propagation in shallow water. It is assumed that the problem is two-dimensional, the source of acoustic disturbance is time-
Santiago, J A F S, Wrobel, L C
core   +1 more source

Information Transmission Strategies for Self‐Organized Robotic Aggregation

Advanced Robotics Research, EarlyView.
In this review, we discuss how information transmission influences the neighbor‐based self‐organized aggregation of swarm robots. We focus specifically on local interactions regarding information transfer and categorize previous studies based on the functions of the information exchanged.
Shu Leng, Zihan Li, Yifeng Shao, Jinhao Liu, Li Yu, Shuguang Li   +5 more
wiley   +1 more source

Weathering the storm: developments in the acoustic sensing of wind and rain [PDF]

, 2003
An Acoustic Rain Gauge (ARG) analyses the underwater sound levels across a wide frequency range, classifies the observed spectrum according to likely source and then determines the local wind speed or rain rate as appropriate. Thispaper covers a trial on
Guymer, Trevor H., Quartly, Graham D., Jones, Claire E., Campbell, Jon M., Birch, Keith G., Waddington, Ian N.   +5 more
core   +1 more source

Implementation and Application of Bellhop Model in Underwater Acoustic Network Simulation

水下无人系统学报
With the development of underwater acoustic technology, underwater acoustic networks(UANs) have attracted much attention due to their performance in marine surveillance, disaster warning, and ocean security.
Qipei LIU, Kun LIU, Yihao LUO, Xinying WU, Heyu ZHOU   +4 more
doaj   +1 more source