Results 21 to 30 of about 2,227,132 (290)

Soft phonon modes and diffuse scattering in Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 relaxor ferroelectrics

Journal of Materiomics, 2018
0.29Pb(In1/2Nb1/2)O3-0.45Pb(Mg1/3Nb2/3)O3-0.26PbTiO3 single crystals have been studied using triple-axis based elastic and inelastic neutron scattering.
Qian Li, Sergey Danilkin, Guochu Deng, Zhengrong Li, Ray L. Withers, Zhuo Xu, Yun Liu   +6 more
doaj   +1 more source

Physics-Aware Machine-Learning-Driven Inverse Design of Broadband Ultra-Open Acoustic Metamaterials. [PDF]

Adv Sci (Weinh)
A physics‐aware machine‐learning framework enables inverse design of ultra‐open acoustic silencers by decoupling spectral and radial design spaces. The approach rapidly identifies broadband, compact, and highly ventilated architectures, while revealing hidden linear design rules that link geometry, impedance matching, and acoustic performance.
Yang Z, Li M, Xie X, Chen A, Bifano TG, Zhang X.   +5 more
europepmc   +2 more sources

Investigation into a prominent 38 kHz scattering layer in the North Sea [PDF]

, 2008
The aim of this study was to investigate the composition of an acoustic scattering layer in the North Sea that is particularly strong at 38 kHz. A full definition of the biological composition of the layer, along with its acoustic properties, would allow
Mair, Angus MacDonald
core   +2 more sources

M-ary Cyclic Shift Keying Spread Spectrum Underwater Acoustic Communications Based on Virtual Time-Reversal Mirror

Sensors, 2019
Underwater acoustic communications are challenging because channels are complex, and acoustic waves when propagating in the ocean are subjected to a variety of interferences, such as noise, reflections, scattering and so on.
Feng Zhou, Bing Liu, Donghu Nie, Guang Yang, Wenbo Zhang, Dongdong Ma   +5 more
doaj   +1 more source

Acoustic Radiation Force and Torque Acting on Asymmetric Objects in Acoustic Bessel Beam of Zeroth Order Within Rayleigh Scattering Limit

Frontiers in Physics, 2022
Acoustic momentum exchange between objects and the surrounding fluid can be quantified in terms of acoustic radiation force and torque, and depends on several factors including the objects’ geometries.
Shahrokh Sepehrirahnama, Sebastian Oberst   +1 more
doaj   +1 more source

The Structure of the Near-Surface Layer of the AAAC Overhead Power Line Wires after Operation and Its Effect on Their Elastic, Microplastic, and Electroresistance Properties

Crystals, 2022
Overhead power-transmission lines are one of the most important components of modern infrastructure. Their service life is determined by the state of the near-surface defect layers (NSDLs) of wires constituting these lines.
Maria V. Narykova, Aleksandr A. Levin, Nikita D. Prasolov, Alexey I. Lihachev, Boris K. Kardashev, Andrej G. Kadomtsev, Andrei G. Panfilov, Roman V. Sokolov, Pavel N. Brunkov, Makhsud M. Sultanov, Vasily N. Kuryanov, Vladimir N. Tyshkevich   +11 more
doaj   +1 more source

Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea

Frontiers in Marine Science, 2021
Records of backscatter and vertical velocity obtained from moored Acoustic Doppler Current Profilers (ADCP) enabled new insights into the dynamics of deep scattering layers (DSLs) and diel vertical migration (DVM) of mesopelagic biomass between these ...
Boris Cisewski, Hjálmar Hátún, Inga Kristiansen, Bogi Hansen, Karin Margretha H. Larsen, Sólvá Káradóttir Eliasen, Jan Arge Jacobsen   +6 more
doaj   +1 more source

Characteristic mode analysis of acoustic scatterers

Journal of Sound and Vibration
11 pages, 10 ...
Lukas Jelinek, Kurt Schab, Viktor Hruska, Miloslav Capek, Mats Gustafsson   +4 more
openaire   +2 more sources

The influence of structural features on the acoustic scattering characteristics of array transducers

Journal of Physics: Conference Series, 2022
Abstract In order to study the sound scattering characteristics of array transducers on different shell structures, based on the COMSOL finite element simulation calculation method, this paper analyzes the scattered sound field characteristics of the array transducer in the single-shell structure, the single-double transition shell ...
openaire   +1 more source

A Composite Matching Layer with Anti‐Reflection Characteristics for Broadband Acoustic Scattering Reduction

Shock and Vibration, 2021
A composite matching layer composed of periodically arranged scatters with anti‐reflection (AR) characteristics is proposed for broadband scattering reduction. The anti‐reflection structure is composed of periodically arranged metal foam scatters, and it is the first attempt to be applied in the field of suppressing acoustic reflection.
Shande Li, Xiaoxun Wu, Jinxiu Duan, Shuai Yuan, Cun Wang, Yane Ma, Zhifu Zhang   +6 more
openaire   +2 more sources