Results 41 to 50 of about 434,289 (296)

Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

Applied Sciences, 2019
To provide theoretical basis for cavitation noise control, the cavitation evolution around a hydrofoil and its induced noise were numerically investigated.
An Yu, Xincheng Wang, Zhipeng Zou, Qinghong Tang, Huixiang Chen, Daqing Zhou   +5 more
doaj   +1 more source

Battery-free wireless imaging of underwater environments

Nature Communications, 2022
The authors present an approach to underwater imaging, which does not require tethering or batteries. The low-power camera uses power from harvested acoustic energy and communicates colour images wirelessly via acoustic backscatter.
Sayed Saad Afzal, Waleed Akbar, Osvy Rodriguez, Mario Doumet, Unsoo Ha, Reza Ghaffarivardavagh, Fadel Adib   +6 more
doaj   +1 more source

Vector Aeroacoustics for a Uniform Mean Flow: Acoustic Intensity and Acoustic Power [PDF]

AIAA Journal, 2018
Acoustic vectors, such as acoustic velocity and acoustic intensity, have advantages over acoustic scalars in showing the detailed propagation path of acoustic energy.
Xu, Chen, Mao, Yijun, Hu, Zhiwei, Ghorbaniasl, Ghader   +3 more
openaire   +3 more sources

Dust-acoustic waves and stability in the permeating dusty plasma: II. Power-law distributions

, 2012
The dust-acoustic waves and their stability driven by a flowing dusty plasma when it cross through a static (target) dusty plasma (the so-called permeating dusty plasma) are investigated when the components of the dusty plasma obey the power-law q ...
Jingyu Gong, Jiulin Du, Landau L., Swanson D. G., Zhipeng Liu   +4 more
core   +1 more source

Design exploration and performance strategies towards power-efficient FPGA-based achitectures for sound source localization [PDF]

, 2019
Many applications rely on MEMS microphone arrays for locating sound sources prior to their execution. Those applications not only are executed under real-time constraints but also are often embedded on low-power devices.
Braeken, An, da Silva Gomes, Bruno, Segers, Laurent, Steenhaut, Kris, Touhafi, Abdellah   +4 more
core   +1 more source

Low temperature-semiconductor band gap thermal shifts: T^4 shifts from ordinary acoustic and T^2 from piezoacoustic coupling

, 2017
At low temperature T, the experimental gap of silicon decreases as E_g(T)=E_g(0)-AT^4. The main reason is electron-phonon renormalization. The physics behind the T^4-power law is more complex than has been realized.
Allen, Philip B., Nery, Jean Paul
core   +1 more source

Small Scale Cosmological Perturbations: An Analytic Approach [PDF]

, 1995
Through analytic techniques verified by numerical calculations, we establish general relations between the matter and cosmic microwave background (CMB) power spectra and their dependence on cosmological parameters on small scales. Fluctuations in the CMB,
Hu, Wayne, Sugiyama, Naoshi
core   +2 more sources

Tuning the Dielectric Properties of Individual Clay Nanosheets by Interlayer Composition: Toward Nano‐Electret Materials

Advanced Functional Materials, EarlyView.
The dielectric properties of clays are studied on the level of individual monolayers and functional double stacks. The material breakdown characteristics and charge storage performance are analyzed. For illustration, a defined charge pattern representing a cuneiform character is produced, written into a microscopic clay tile, referencing the origins of
Sebastian Gödrich, Paul Markus, Matthias Stöter, Bernhard Biersack, Rainer Schobert, Josef Breu, Georg Papastavrou   +6 more
wiley   +1 more source

Novel Real-Time Acoustic Power Estimation for Dynamic Thermoacoustic Control

Applied Sciences
This paper presents a new procedure for the real-time processing and analysis of data from thermoacoustic systems. The approach focuses on continuously acquiring and adjusting measurements of acoustic wave pressure, enabling the instantaneous estimation ...
Eduardo Pilo de la Fuente, Jaime Gros, María Antonia Simón Rodríguez, Ana-Isabel Velasco, Carmen Iniesta   +4 more
doaj   +1 more source

Acoustic tests of type KPF1 high-pressure external gear pumps

Technical Transactions, 2020
This article presents the results of testing the sound pressure level and sound power level of the experimental 3PW-KPF1-24-40-2-776 high-pressure gear pump. Acoustic tests were conducted in an reverberation chamber.
Osiński Piotr, Rutański Janusz, Bury Paweł, Cieślicki Rafał   +3 more
doaj   +1 more source