Results 71 to 80 of about 7,593 (278)

Ocean Reverberation Suppression via Matrix Completion with Sensor Failure

, 2020
In the ocean environment, reverberation is a common and strong interference which significantly degrades the performance of target bearing estimation. Meanwhile, sensor failure is inevitable in actual sonar deployment as the underwater scene is complicated. Therefore, it is a challenge for target detection in the ocean reverberation with sensor failure.
Xu, Li-ya, Liao, Bin, Zhang, Hao, Xiao, Peng, Huang, Jian-jun   +4 more
openaire   +2 more sources

A forward speed effects study on jet noise from several suppressor nozzles in the NASA/Ames 40- by 80-foot wind tunnel [PDF]

A test program was conducted in a 40 by 80 foot wind tunnel to evaluate the effect of relative velocity on the jet noise signature of a conical ejector, auxiliary inlet ejector, 32 spokes and 104 tube nozzle with and without an acoustically treated ...
Beulke, M. R., Clapper, W. S., Mccann, E. O., Morozumi, H. M.   +3 more
core   +1 more source

PSD Estimation of Multiple Sound Sources in a Reverberant Room Using a Spherical Microphone Array

, 2017
We propose an efficient method to estimate source power spectral densities (PSDs) in a multi-source reverberant environment using a spherical microphone array.
Abhayapala, Thushara D., Fahim, Abdullah, Samarasinghe, Prasanga N.   +2 more
core   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

An Adaptive Tracking Method for Moving Target in Fluctuating Reverberation Environment

Remote Sensing
In environments with a low signal-to-reverberation ratio (SRR) characterized by fluctuations in clutter number and distribution, particle filter-based tracking methods may experience significant fluctuations in the posterior probability of existence ...
Ning Wang, Rui Duan, Kunde Yang, Zipeng Li, Zhanchao Liu   +4 more
doaj   +1 more source

Optimal Waveform Design Using Frequency-Modulated Pulse Trains for Active Sonar

Sensors, 2019
Frequency-modulated pulse trains can be applied in active sonar systems to improve the performance of conventional transmitted waveforms. Recently, two pulse trains have been widely researched as the transmitted waveforms for active sonars.
Chengyu Guan, Zemin Zhou, Xinwu Zeng
doaj   +1 more source

Оптимизация параметров алгоритма подавления поздней реверберации [PDF]

, 2014
Показано існування оптимальних, в сенсі таких критеріїв як точність розпізнавання мовлення та якість мовлення, значень границі між ранніми відлуннями та пізньою реверберацією.
Ladoshko, O., Prodeus, A., Ладошко, О. М., Ладошко, О. Н., Продеус, А. М., Продеус, А. Н.   +5 more
core  

Seoul National University Camera II (SNUCAM-II): The New SED Camera for the Lee Sang Gak Telescope (LSGT)

, 2017
We present the characteristics and the performance of the new CCD camera system, SNUCAM-II (Seoul National University CAMera system II) that was installed on the Lee Sang Gak Telescope (LSGT) at the Siding Spring Observatory in 2016.
Choi, Changsu, Im, Myungshin
core   +1 more source

An Energy Focusing Flexible and Lightweight Acoustic Metamaterial for Enhanced Ultrasound Power Transfer

Advanced Materials, EarlyView.
A flexible and lightweight acoustic metamaterial composed of air cavities encased in polydimethylsiloxane (PDMS) is introduced to enhance ultrasound power transfer. The metamaterial leverages the strong reflectivity of air cavity boundaries to concentrate incoming ultrasound, thereby improving the performance of piezoelectric energy harvesters ...
Hyung‐Suk Kwon, Ziqi Yu, Xiaopeng Li, Ercan M. Dede, Taehwa Lee   +4 more
wiley   +1 more source

Cascaded-Filter-Based Reverberation Suppression Method of Short-Pulse Continuous Wave for Active Sonar

Remote Sensing
Reverberation is the main background interference in active sonar and seriously interferes with the extraction of the target echo. Active sonar systems can use short-pulse continuous wave (CW) signals to reduce the reverberation intensity.
Yonglin Cui, Shuhan Liao, Juncheng Gao, Haidong Zhu, Nengtong Zhao, An Luo   +5 more
doaj   +1 more source