Results 11 to 20 of about 21,993 (294)

A Frequency-Dependent and Nonlinear, Time-Explicit Five-Layer Human Head Numerical Model for Realistic Estimation of Focused Acoustic Transmission Through the Human Skull for Noninvasive High-Intensity and High-Frequency Transcranial Ultrasound Stimulation: An Application to Neurological and Psychiatric Disorders [PDF]

open access: yesBioengineering
Transcranial focused ultrasound is a promising noninvasive technique for neuromodulation in neurological and psychiatric disorders, but accurate prediction of acoustic transmission through the skull remains a major challenge.
Shivam Sharma   +2 more
doaj   +2 more sources

Carbonation Assessment in Concrete by Nonlinear Ultrasound

open access: yesCement and Concrete Research, 2011
International audienceThe carbonation process results in a change in the elastic properties of concrete, resulting in a variation of standard acoustic indicators such as wave speed.
V. Garnier   +11 more
core   +3 more sources

Nonlinear X-Wave Ultrasound Imaging of Acoustic Biomolecules

open access: yesPhysical Review X, 2018
The basic physics of sound waves enables ultrasound to visualize biological tissues with high spatial and temporal resolution. Recently, this capability was enhanced with the development of acoustic biomolecules—proteins with physical properties enabling
David Maresca   +4 more
doaj   +2 more sources

Simulation of nonlinear wave propagation in ultrasound. [PDF]

open access: yes, 2014
Nonlinear wave propagation has, for the last couple of decades, become an increasingly more important tool in medical ultrasound imaging. Creating ultrasound images from echoes in the second harmonic frequency band provides a major enhancement to the ...
Seljåsen, Håkon
core   +3 more sources

The Variation of Precipitated Phase Investigated with the Usage of Nonlinear Ultrasonic Technique

open access: yesArchives of Acoustics, 2021
It is well known that nonlinear ultrasound is sensitive to some microstructural characteristics in material. This paper investigates the dependence of the nonlinear ultrasonic characteristic on Al-Cu precipitation in heat-treated 2219-T6 aluminum alloy ...
Jun YOU, Yunxin WU, Hai GONG
doaj   +1 more source

Nonlinear Ultrasonic Imaging for Porosity Evaluation

open access: yesSensors, 2023
The influence of porosity on the mechanical behaviour of composite laminates represents a complex problem that involves many variables. Therefore, the evaluation of the type and volume content of porosity in a composite specimen is important for quality ...
Mario Emanuele De Simone   +3 more
doaj   +1 more source

Linear and Nonlinear Normal Interface Stiffness in Dry Rough Surface Contact Measured Using Longitudinal Ultrasonic Waves

open access: yesApplied Sciences, 2021
When two rough surfaces are loaded together contact occurs at asperity peaks. An interface of solid contact regions and air gaps is formed that is less stiff than the bulk material.
Saeid Taghizadeh   +1 more
doaj   +1 more source

An Interface Pressure Detection Method of Cable Silicone Rubber-XLPE Based on Nonlinear Ultrasound

open access: yesApplied Sciences, 2023
The interface pressure between the cable attachment and the body is crucial for the stable long-term operation of the cable. To solve the issue of interface insulation characteristics’ damage caused by the pressure transducer measurement method, a non ...
Chunhua Fang   +7 more
doaj   +1 more source

Nonlinear Waveform Inversion for Quantitative Ultrasound

open access: yesIEEE Transactions on Computational Imaging, 2022
Due to its non-invasive and non-radiating nature, along with its low cost, ultrasound (US) imaging is widely used in medical applications. Typical B-mode US images have limited resolution and contrast and weak physical interpretation. Inverse US methods were developed to reconstruct the media's speed-of-sound (SoS) based on a linear acoustic model ...
Avner Shultzman, Yonina C. Eldar
openaire   +2 more sources

18F-FDG and 68 Ga-FAPI PET/CT for the evaluation of periprosthetic joint infection and aseptic loosening in rabbit models

open access: yesBMC Musculoskeletal Disorders, 2022
Purpose We built a joint replacement loosening model based on the original rabbit model of infection and evaluated the performance characteristics of 18F-FDG and 68 Ga-FAPI in evaluating infection and loosening.
Yiqun Wang   +9 more
doaj   +1 more source

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