Results 41 to 50 of about 15,272 (279)
Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers [PDF]
, 2019 Article describes a study where a tunable hybrid solid ultrasonic lens is realized by combining a PnC lens with PVA-PNIPAm thermoacoustic hydrogel to modify the transmission and dispersion properties of transient acoustic ...
Reyes-Contreras, Delfino +3 more
core +3 more sources
M-Bonacci Zone Plates for Ultrasound Focusing
Sensors, 2019 In this work, we present a thorough analysis on M-bonacci zone plates for ultrasound focusing applications. These planar lenses are capable of providing bifocal focusing profiles with equal intensity in both foci and become very appealing for a wide ...
Sergio Pérez-López +2 more
doaj +1 more source
Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications
Sensors, 2021 In this work, we analyze the effect of predistortion techniques on the focusing profile of Fresnel Zone Plates (FZPs) in ultrasound applications. This novel predistortion method is based on either increasing or decreasing the width of some of the FZP ...
José Miguel Fuster +3 more
doaj +1 more source
, 2003 Acoustic radiation from a spherical source undergoing angularly periodic axisymmetric harmonic surface vibrations while eccentrically suspended within a thermoviscous fluid sphere, which is immersed in a viscous thermally conducting unbounded fluid ...
Azarpeyvand, Mahdi +3 more
core +1 more source
Passive directivity detection of acoustic sources based on acoustic Luneburg lens
, 2023 This article reports an acoustic Luneburg lens (ALL) design with graded refractive index for passive directivity detection of acoustic sources. The refractive index profile of the lens is realized based on square pillars with graded variation of their ...
Tang, Lihua +11 more
core +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 ...
Libin Du +3 more
doaj +1 more source
A new acoustic lens material for large area detectors in photoacoustic breast tomography [PDF]
, 2013 ObjectivesWe introduce a new acoustic lens material for photoacoustic tomography (PAT) to improve lateral resolution while possessing excellent acoustic acoustic impedance matching with tissue to minimize lens induced image artifacts.BackgroundA large ...
Manohar, Srirang +14 more
core +1 more source
International Journal of Smart and Nano Materials, 2015 We investigate the use of graded inhomogeneities in order to enhance the focusing and collimation performance of structure-embedded acoustic metamaterial lenses.
H. Zhu, F. Semperlotti
doaj +1 more source
Experiments on frightening effects to fish by underwater sound emitters for diversion from dangerous areas of reservoirs [PDF]
Caspian Journal of Environmental SciencesLarge reservoirs have areas dangerous for fish. For instance, water intake facilities, hydroelectric dams, etc. Therefore, it becomes necessary to protect or divert fish from such areas. One way to achieve this is to use loud underwater sound.
Artur Tumenov +4 more
doaj +1 more source
3D Printing Innovations in Polymeric Porous and Patterned Architecture
Advanced Functional Materials, EarlyView.Polymeric foams occupy a unique structural space between dense solids and open networks, where engineered void fraction governs mechanical compliance, thermal resistance, and mass transport. Additive manufacturing now enables precise spatial control over cellular architecture, unlocking designer foam structures across applications spanning crash ...
Dhanush Patil +13 more
wiley +1 more source