Results 41 to 50 of about 35,365 (254)

Characterization of focused-ultrasound-induced acoustic streaming [PDF]

Experimental Thermal and Fluid Science, 2019
This study is interested in one of the hydrodynamic mechanisms induced by High Intensity Focused Ultrasound (HIFU) propagation in a liquid medium, the acoustic streaming phenomenon. The latter is a flow generation caused by acoustic energy viscous dissipation during acoustic wave propagation in a fluid medium. Particle Image Velocimetry (PIV) technique
Ben Haj Slama, Rafika, Gilles, Bruno, Ben Chiekh, Maher, Bera, J.C.   +3 more
openaire   +2 more sources

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Acoustic Forceps Based on Focused Acoustic Vortices with Different Topological Charges

Sensors, 2023
For enhanced energy concentration with improved flexibility for object manipulation, a focused acoustic vortex (FAV) is designed using a sector planar piston transducer array and acoustic lens that can produce the effective concentration of the acoustic field to perform the focusing function.
Libin Du, Gehao Hu, Yantao Hu, Qingdong Wang   +3 more
openaire   +3 more sources

Karl Popper and the Mechanisms of Hydrogen Embrittlement

Advanced Engineering Materials, EarlyView.
Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley   +1 more source

Multimodal Data‐Driven Microstructure Characterization

Advanced Engineering Materials, EarlyView.
A self‐consistent autonomous workflow for EBSP‐based microstructure segmentation by integrating PCA, GMM clustering, and cNMF with information‐theoretic parameter selection, requiring no user input. An optimal ROI size related to characteristic grain size is identified.
Qi Zhang, Santiago Benito, Özge Özgün, Sebastian Weber, Markus Stricker   +4 more
wiley   +1 more source

Acoustic Focusing Imaging Characteristics Based on Double Negative Locally Resonant Phononic Crystal

IEEE Access, 2019
To achieve high-efficiency and high-resolution acoustic focusing, we used artificial periodic acoustic structures composed of cell arrays to manipulate the acoustic transmission wave front, and used finite element software to simulate the acoustic field ...
Shuai Tang, Rui Wang, Jianning Han
doaj   +1 more source

Laser-nucleated acoustic cavitation in focused ultrasound [PDF]

Review of Scientific Instruments, 2011
Acoustic cavitation can occur in therapeutic applications of high-amplitude focused ultrasound. Studying acoustic cavitation has been challenging, because the onset of nucleation is unpredictable. We hypothesized that acoustic cavitation can be forced to occur at a specific location using a laser to nucleate a microcavity in a pre-established ...
Gerold, Bjoern, Kotopoulis, Spiros, Mcdougall, Craig, Mcgloin, David, Postema, Michiel, Prentice, Paul   +5 more
openaire   +3 more sources

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

Performance and influencing factors of acoustic grating based on signal enhancement

Xibei Gongye Daxue Xuebao
In the acoustic signal receiving section of underwater vehicle, an effective measure to improve surface acoustic impedance and reduce signal attenuation is to cover acoustic barrier plate of hydrophone array with high impedance material (signal ...
YANG Lei, CHEN Kean, LYU Ning, TIAN Fenghua, ZHANG Jiyang, LIU Yidong   +5 more
doaj   +1 more source

Wavelength-scale gas-filled cuboid acoustic lens with diffraction limited focusing

Results in Physics, 2019
Per the laws of geometrical optics, a plane-parallel medium does not possess focusing properties. However, in this paper, we demonstrate for the first time that an acoustic cuboid particle filled with CO2 is able to focus sound despite its flat surface ...
Constanza Rubio, Daniel Tarrazó-Serrano, Oleg V. Minin, Antonio Uris, Igor V. Minin   +4 more
doaj   +1 more source