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Single ultrasound device, capable of operating over dual or multiple frequencies, would benefit and expand a series of applications, such as acoustic cavitation enhancement, transdermal drug release, nondestructive testing, ultrasound and photoacoustic imaging. One of the approaches for a dual-frequency operation is to integrate both high- and low-frequency transducer elements in a single chip [1-3]...
High-resolution ultrasound imaging of tissues provides a higher possibility for the early diagnosis of various diseases and plays an important role in high-precision targeted treatment. However, it unavoidably suffers from low penetration depth and short depth of field (DOF) due to its high operating frequency. A novel single-element dual-frequency ultrasound transducer (DFUT) has been designed and...
The solar sail is a new type of spacecraft with high area-mass-ratio and large flexible structure, using solar radiation pressure (SRP) as the main method of spacecraft propulsion. The dynamical interactions among the attitude, the orbit and the vibration of the solar sail are the key challenges of the control system. The propose of this study which is carried out from the statics and dynamics perspective...
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