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Bladder cancer is one of the leading causes of cancer-related death in the world. Prolonged exposure to benzidine is a known cause of bladder cancer. Curcumin has been clinically used in chemoprevention and treatment of cancer. However, it remains unknown whether mitogen-activated protein kinase (MAPK) pathways are involved in curcumin-mediated protection from benzidine-associated promotive effects...
The Langevin ultrasonic transducer is widely used in many high-power ultrasonic applications. The output power of a Langevin ultrasonic transducer is limited by many factors, and the electrical limit is one of most important factors. In this paper, the reason which restricts the improvement of the electrical limit is briefly analyzed for a typical Langevin ultrasonic transducer. In order to improve...
A cascade structure of half-wavelength transducer is proposed for improving power capacity of the transducer, and a dual-excited full-wavelength piezoelectric ultrasonic transducer consisting of two half-wavelength transducers is especially studied. Based on one-dimensional theory, the resonance and the anti-resonance frequency equations of the transducer are derived. The validity of the theoretical...
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