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The presented work investigates the metal-to-liquid phase transition induced by a nanosecond pulsed-laser. The generation and propagation of the elastic waves by the surface thermal source is described by the coupled heat conduction and elastic wave equations and solved using a numerical finite difference time domain (FDTD) technique. During laser-induced melting the molten mass loses its rigidity...
The use of ultrasound for therapeutic applications involving innovative drug delivery methodologies is a promising area of research to enhance the effectiveness of drug treatment to treat a wide range of diseases, including cancer, peripheral vascular disease, and stroke. Rather than use destructive heating, we have designed and built a family of multi-functional arrays which can ultrasonically identify...
A theoretical model is proposed in this work for an evaluation of the specific heat and Debye temperature of thin-film semiconductors. In the model, the specific heat contributed by the confined acoustic phonons is calculated first. An effective Debye temperature is then defined by fitting the conventional Debye model to the calculated specific heat. It is found that the so-defined Debye temperatures...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
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