Kuen Ming Shu¹, Chien Chih Chen²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.4, pp. 109-110, 2009, DOI:10.3970/icces.2009.011.109

Abstract Ultrasonic welding is the joining or reforming of thermoplastics through the use of heat generated from high-frequency mechanical motion. Rotary welding is a technique to press two parts together and one part is hold fixed the other rotates at high speed, the friction between the two parts generate heat which causes the parts to melt at the interface, when rotation stops, the weld cools down and solidifies. In this research, an experimental set-up integrated these two different welding processes in one machine set was designed and fabricated to provide a tool to study the integrated More >

C.C. Chia¹, S.G. Jang¹, J.R. Lee², D.J. Yoon²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.11, No.2, pp. 29-30, 2009, DOI:10.3970/icces.2009.011.029

Abstract An ultrasonic propagation imaging (UPI) system consisted of a Q-switched Nd-YAG pulsed laser with 20 Hz-repetition rate and a motorized tilting mirror system for rapid scanning of target was developed. The system which requires neither reference data nor fixed focal length could be used for health monitoring of curved structures. If combined with a fiber acoustic wave PZT (FAWPZT) sensor, it could be used to perform inspection on hot target structures, which present formidable challenges to the usage of contact piezoelectric transducers mainly due to the Curie temperature limitation of transducers and debonding problem due… More >

G.V. Norton^*, J.C. Novarini^†

Molecular & Cellular Biomechanics, Vol.4, No.2, pp. 75-86, 2007, DOI:10.3970/mcb.2007.004.075

Abstract Ultrasonic imaging in medical applications involves propagation and scattering of acoustic waves within and by biological tissues that are intrinsically dispersive. Analytical approaches for modeling propagation and scattering in inhomogeneous media are difficult and often require extremely simplifying approximations in order to achieve a solution. To avoid such approximations, the direct numerical solution of the wave equation via the method of finite differences offers the most direct tool, which takes into account diffraction and refraction. It also allows for detailed modeling of the real anatomic structure and combination/layering of tissues. In all cases the correct… More >

Aleksandr N. Guz¹

CMES-Computer Modeling in Engineering & Sciences, Vol.8, No.3, pp. 217-230, 2005, DOI:10.3970/cmes.2005.008.217

Abstract The ultrasonic non-destructive method of determination of stresses in near-the-surface layers of solid bodies is based on the regularities of elastic surface wave propagation in bodies with initial (residual) stresses. Above mentioned regularities are received in the framework of the 3-D linearized theory of waves propagation in bodies with initial (residual) stresses. Computational methods are used for solution of the dispersion equations as applied to problems under consideration. Description of the non-destructive method and information on instruments and devices for measurements are presented. Some examples of non-destructive determination of stresses in near-the-surface layers of materials More >

Amy E. Krambeck, Kent C. Krejci, David E. Patterson, Andrew J. LeRoy, Joseph W. Segura

Canadian Journal of Urology, Vol.11, No.5, pp. 2383-2389, 2004

Abstract Objective: Shock wave lithotripsy (SWL) is an attractive initial treatment for nephrolithiasis. Unfortunately, a significant number of stones are resistant to SWL therapy and require subsequent percutaneous ultrasonic lithotripsy (PUL) for definitive treatment. Our objective was to determine if previous SWL had adverse effects on PUL success and if there were differences between the patients undergoing primary PUL and those undergoing PUL after SWL failure.
Materials and methods: In 2001, 108 PULs were performed at our institution, of which 40 (37%) were performed after SWL failure. Stone location, anesthesia time, stone composition and size, and complication rates… More >