Results 71 to 80 of about 32,987 (227)

3D Large‐Scale Subwavelength‐Resolution Sound Sheet Tomography Based on an Active and Programmable Circular Meta‐Array

Advanced Science, EarlyView.
A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang, Zi‐Bin Lin, Zhuo Chen, Zhao‐Hui Liu, Jin‐Lian He, Jun‐Jie Song, Long‐Sheng Zeng, Liang Zhou, Ming‐Yue Ding, Yu‐Gui Peng, Ming Yuchi, Xue‐Feng Zhu   +11 more
wiley   +1 more source

An Approach for Diver Passive Detection Based on the Established Model of Breathing Sound Emission

Journal of Marine Science and Engineering, 2020
Diver breathing sounds can be used as a characteristic for the passive detection of divers. This work introduces an approach for detecting the presence of a diver based on diver breathing sounds signals.
Qiang Tu, Fei Yuan, Weidi Yang, En Cheng
doaj   +1 more source

R&D of a low-complexity OFDM acoustic communication payload for Micro-AUV in confined space

EURASIP Journal on Advances in Signal Processing, 2022
With small size, high flexibility, low cost, and deployment convenience, Micro-sized autonomous underwater vehicle (Micro-AUV) is capable of performing diverse underwater missions efficiently in confined underwater space, for the extensive purpose of ...
Weihua Jiang, Qiuyang Tao, Junhui Yao, Feng Tong, Fumin Zhang   +4 more
doaj   +1 more source

Acoustic Parametric Signal Generation for Underwater Communication [PDF]

Sensors, 2018
This paper presents a study of different types of parametric signals with application to underwater acoustic communications. In all the signals, the carrier frequency is 200 kHz, which corresponds to the resonance frequency of the transducer under study and different modulations are presented and compared.
María Campo-Valera, Miguel Ardid, Dídac D. Tortosa, Ivan Felis, Juan A. Martínez-Mora, Carlos D. Llorens, Pablo Cervantes   +6 more
openaire   +4 more sources

Recent Advances in Laser‐Induced Graphene‐Based Gas Sensors: From Sensing Mechanisms to Biomedical Applications

Advanced Science, EarlyView.
Laser‐induced graphene (LIG) provides a scalable, laser‐direct‐written route to porous graphene architecture with tunable chemistry and defect density. Through heterojunction engineering, catalytic functionalization, and intrinsic self‐heating, LIG achieves highly sensitive and selective detection of NOX, NH3, H2, and humidity, supporting next ...
Md Abu Sayeed Biswas, Ankan Dutta, Shuvendu Das, Abu Musa Abdullah, Wanqing Zhang, Fatema Tuz Zohra, Huanyu Cheng   +6 more
wiley   +1 more source

On the consistency of MODIS chlorophyll $a$ products in the northern South China Sea [PDF]

Biogeosciences, 2014
Chlorophyll a (Chl) concentrations derived from satellite measurements have been used in oceanographic research, for example to interpret eco-responses to environmental changes on global and regional scales.
S. L. Shang, Q. Dong, C. M. Hu, G. Lin, Y. H. Li, S. P. Shang   +5 more
doaj   +1 more source

High precision DOA estimation of microphone array for shipboard teleconferencing

Dianzi Jishu Yingyong, 2022
With the improvement of ship intelligence level, shipboard teleconferencing system is of great significance to improve the emergency handling capacity and promote the construction of shipboard integrated network.
Liu Yuji, Tong Feng, Chen Dongsheng, Lu Rongfu, Feng Wanjian   +4 more
doaj   +1 more source

Deep learning based underwater acoustic OFDM communications [PDF]

Applied Acoustics, 2019
Abstract In this paper, we present a deep learning based underwater acoustic (UWA) orthogonal frequency-division multiplexing (OFDM) communication system. Unlike the traditional receiver for UWA OFDM communication system that performs explicitly channel estimation and equalization for the detection of transmitted symbols, the deep learning based UWA ...
Zhang, Youwen, Li, Junxuan, Zakharov, Yuriy, Li, Xiang, Li, Jianghui   +4 more
openaire   +5 more sources

Smart Flexible Tactile Sensors: Recent Progress in Device Designs, Intelligent Algorithms, and Multidisciplinary Applications

Advanced Intelligent Discovery, EarlyView.
Flexible tactile sensors have considerable potential for broad application in healthcare monitoring, human–machine interfaces, and bioinspired robotics. This review explores recent progress in device design, performance optimization, and intelligent applications. It highlights how AI algorithms enhance environmental adaptability and perception accuracy
Siyuan Wang, Ming Dong, Rongrong Bao, Caofeng Pan   +3 more
wiley   +1 more source

A Method for Underwater Image Enhancement Utilizing Polarization Inspired by the Mantis Shrimp’s Multi-Dimensional Visual Imaging Mechanism

Journal of Marine Science and Engineering
Optical attenuation caused by absorption and scattering in turbid water significantly degrades underwater image quality, making reliable underwater imaging a challenging problem.
Qingyu Liu, Ruixin Li, Congcong Li, Canrong Chen, Yifan Huang, Huayu Yang, Fei Yuan   +6 more
doaj   +1 more source