Results 21 to 30 of about 595,307 (370)
Ultrasonic wave propagation in cylindrical vessels and implications for ultrasonic reactor design [PDF]
, 2010 Reactors in which processes are enhanced by ultrasound are hampered by the lack of a theoretical framework on their design. Simulation results of ultrasonic wave propagation in a cylindrical geometry are presented in this work, which are then used to ...
Gachagan, A. +3 more
core +1 more source
Journal of Applied Research and Technology, 2013 AbstractWe report the development of an ultrasonic levitation system. Liquid drops or solid samples of diameter less than one half wavelength of the excitation frequency are levitated without contact just below the pressure nodes. The piezo transducer is excited by an ultrasonic signal of around 29kHz through a voltage amplifier.
R. R. Boullosa +2 more
openaire +3 more sources
Ultrasound array transmitter architecture with high timing resolution using embedded phase-locked loops [PDF]
, 2012 Coarse time quantization of delay profiles within ultrasound array systems can produce undesirable sidelobes in the radiated beam profile. The severity of these sidelobes is dependent upon the magnitude of phase quantization error - the deviation from ...
Cowell, DMJ +4 more
core +1 more source
BMC Cardiovascular Disorders, 2019 Background Takotsubo cardiomyopathy (TCM) is a brief ventricular dysfunction that usually occurs after emotional or physical stress. Here, we report a patient who underwent cardiac surgery and then developed TCM during the postoperative period.
Jia-Hui Zeng +8 more
doaj +1 more source
Applied Sciences, 2023 Polymers are increasingly being used in higher demanding applications due to their ability to tailor the properties of structures while allowing for a weight and cost reduction.
Gonzalo Seisdedos +8 more
doaj +1 more source
A comparison of two configurations for a dual-resonance cymbal transducer [PDF]
, 2018 The ability to design tuned ultrasonic devices that can be operated in the same mode at two different frequencies has the potential to benefit a range of applications, such as surgical cutting procedures where the penetration through soft then hard ...
Feeney, Andrew, Lucas, Margaret
core +1 more source
The Detection of Burn-Through Weld Defects Using Noncontact Ultrasonics
Materials, 2018 Nearly all manufactured products in the metal industry involve welding. The detection and correction of defects during welding improve the product reliability and quality, and prevent unexpected failures.
Z. Abbasi +6 more
semanticscholar +1 more source
Directivity pattern of the sound radiated from square stepped-plate radiators
Acta Acustica, 2020 A square flat-plate radiator driven by a longitudinal vibrator at the resonant frequency of its fourth-order natural vibration mode at its center for the generation of highly directional ultrasonic radiation in air is studied herein.
Xiping He, Na Li
doaj +1 more source
International Journal of Hyperthermia, 2023 Purpose To assess the utility of Sonazoid contrast-enhanced ultrasound (CEUS) for guiding percutaneous microwave ablation (MWA) for colorectal liver metastases (CRLMs).Materials and Methods The medical records of patients who had undergone ultrasound (US)
Si Qin +5 more
doaj +1 more source
Influence of surface roughness from additive manufacturing on laser ultrasonics measurements
, 2019 Additive manufacturing (AM) is viewed as a revolutionary technique as it offers numerous appealing capabilities such as complex geometries, functionally graded properties, build-upon-demand, repairs, etc. However, in order to attain the full potential of
C. Bakre +2 more
semanticscholar +1 more source