Heat dissipation in ultrasonic motors should be limited, especially in precision applications since it causes thermal deformations. Therefore, n easy-to-understand mechanical model was developed to simulate heat dissipation in an ultrasonic motor. This model involves the dielectric, iezoelectric and mechanical hysteretic losses of the piezoelectric material. Both the model and the experiments l...

According to turning instead of grinding process requirements and traditional working principle of ultrasonic vibration turning, a new idea of imitating grinding of two-dimensional ultrasonic vibration turning is brought firstly, and the mechanism of two-dimens ional ultrasonic vibration turning is elaborated. Based on the MATLAB software, grinding trajectory simulation and honing trajectory si...

Doped piezoceramic lead zircanate titanate has been characterized in the frequency range of 20–60 MHz using ultrasonic spectroscopy. Theoretical analyses were performed for the reflection and refraction of acoustic waves at the interface of water-piezoelectric ceramic. The incident directions of the wave were chosen to be appropriate for ultrasonic spectroscopy measurements. Shear wave spectrum...

Shear wave elasticity imaging (SWEI) is a new approach to imaging and characterizing tissue structures based on the use of shear acoustic waves remotely induced by the radiation force of a focused ultrasonic beam. SWEI provides the physician with a virtual "finger" to probe the elasticity of the internal regions of the body. In SWEI, compared to other approaches in elasticity imaging, the induc...

results when the two ms groups were compared together, we found that cr was significantly increased (p value=0.008) and naa/cr was significantly decreased (p value=0.03) in non-enhancing lesions in ppms compared with rrms. there was no significant difference in naa, cho or naa/cho between the two ms subtypes. conclusion mrs is a potential way to differentiate ppms and rrms. objectives we compar...

Ultrasonic-assisted green synthesis of silver nanoparticles is gaining more attention owing to its benefits over conventional process. The main objective this study was synthesize with aqueous cinnamon extract using ultrasound-assisted extraction and their physico-chemical characterization. Total phenolic content, DPPH, FRAP were 315 mg GAE/g, 89% scavenging activity 9.5 mmol Trolox eq/100 g re...