Results 71 to 80 of about 4,113,395 (325)

Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water

Sensors, 2018
A coherent-noncoherent joint processing framework is proposed for active sonar to combine diversity gain and beamforming gain for detection of a small target in shallow water environments.
Xiang Pan, Jingning Jiang, Si Li, Zhenping Ding, Chen Pan, Xianyi Gong   +5 more
doaj   +1 more source

All‐Solution Processed OFETs from Non‐Chlorinated Solvents Based on New Isoindigo‐Based Conjugated Polymer

Advanced Electronic Materials, EarlyView.
The solution‐coating of a new isoindigo‐based conjugated polymer is systematically tuned to achieve high charge carrier mobility in OFETs. It is shown that solution‐shearing from high boiling point solvents yields aligned semiconducting thin films with optimized OFET characteristics.
Katherina Haase, Jonathan Perez Andrade, Mike Hambsch, Vithyasaahar Sethumadhavan, Waner He, Tsuyoshi Michinobu, Prashant Sonar, Stefan C. B. Mannsfeld   +7 more
wiley   +1 more source

Scattering statistics of rock outcrops: Model-data comparisons and Bayesian inference using mixture distributions [PDF]

, 2019
The probability density function of the acoustic field amplitude scattered by the seafloor was measured in a rocky environment off the coast of Norway using a synthetic aperture sonar system, and is reported here in terms of the probability of false ...
Anthony P. Lyons, Bishop C. M., Crowther P. A., Derek R. Olson, Dong Y., Douglas A. Abraham, Farshchian M., Fossum T. G., Gauss R. C., Gelman A., Lyons A. P., Midtgaard Ø., Oppenheim A. V., Papoulis A., Titterington D. M., Torstein O. Sæbø, Ward K. D.   +16 more
core   +2 more sources

CoRoFR: Community Detection of Feature Graph Improves Feature Selection Using Robust Fuzzy Rough Set

Advanced Intelligent Systems, EarlyView.
In machine learning, features often function as communities in many tasks, especially in medicine. However, existing feature selection methods struggle to mine feature collaborations, which can boost predictive performance. Moreover, they are noise‐sensitive, leading to suboptimal feature selection and accuracy degradation.
Duanyang Feng, Wenjian Liu, Sheng Peng, Yuankun Liu, Wanlei Zhou   +4 more
wiley   +1 more source

Influence of Beam Angle of Array Sound Source on Sound Propagation in Typical Shallow Sea Environments

水下无人系统学报
With the development of active sonar technology, the beam output capability of active sonar has become the focus of engineering research. It is necessary to study the influence of the sound beam angle on sound propagation for a typical vertical linear ...
Yanyang LU, Qinglang CHEN, Xun LI, Zhaohong WANG   +3 more
doaj   +1 more source

Detected [PDF]

, 2018
A Navy sub commander plays hide-and-seek with a Soviet sub. Articles, stories, and other compositions in this archive were written by participants in the Mighty Pen Project. The program, developed by author David L.
Knaggs, Christopher
core   +1 more source

Geophysical Prospecting for the Detection of Buried and Shallow Submerged Archaeological Sites of Roman Period in the Lagoon of Venice (Italy)

Archaeological Prospection, EarlyView.
ABSTRACT We present a study that combines several marine geophysical techniques to detect and map archaeological sites from the Roman period in the shallow waters of the Venice Lagoon, Italy. We employed marine electrical resistivity tomography (M‐ERT), a drone‐based unmanned surface vehicle (USV) multibeam sonar, and subbottom profiler technology to ...
Carlo Beltrame, Elisa Costa, Paolo Mozzi, Alberto Carrera, Jacopo Boaga   +4 more
wiley   +1 more source

Synthesis and Modification of Cetacean Tonal Sounds for Underwater Bionic Covert Detection and Communication

IEEE Access, 2020
For most conventional bionic signal design methods, they cannot construct high-similarity bionic signals to match those complex cetacean sounds because they are only based on relatively simple bionic signal models.
Jiajia Jiang, Zhongbo Sun, Fajie Duan, Xiao Fu, Xianquan Wang, Chunyue Li, Wei Liu, Lin Gan   +7 more
doaj   +1 more source

Study on Underwater Target Tracking Technology Based on an LSTM–Kalman Filtering Method

Applied Sciences, 2022
In the marine environment, underwater targets are often affected by interference from other targets and environmental fluctuations, so traditional target tracking methods are difficult to use for tracking underwater targets stably and accurately.
Maofa Wang, Chuzhen Xu, Chuanping Zhou, Youping Gong, Baochun Qiu   +4 more
doaj   +1 more source

Пути повышения эффективности системы «гидроакустическая станция – надводный корабль» с сосредоточенными антеннами переменной глубины [PDF]

, 2015
В роботі проведені дослідження щодо можливостей підвищення ефективності системи «гідроакустична станція - надводний корабель» із зосередженими антенами змінної глибини.
Derepa, A., Дерепа, А. В., Дерепа, А. В.   +2 more
core