It is known that a handclap in front of the stairs of the great pyramid of Chichen Itza produces a chirp echo which sounds more or less like the sound of a Quetzal bird. The present work describes precise diffraction simulations and attempts to answer the critical question what physical effects cause the formation of the chirp echo. Comparison is made with… (More)
Ultrasonic guided waves are capable of rapidly interrogating large, plate-like structures for both nondestructive evaluation and structural health monitoring (SHM) applications. Distributed sparse arrays of inexpensive piezoelectric transducers offer a cost-effective way to automate the interrogation process. However, the sparse nature of the array limits… (More)
" Measurement of the Frequency Dependence of the Ultrasonic Parametric Threshold Amplitude for a Fluid-Filled Cavity ". The Kondo effect to Heavy Fermions Studied using the de Haas – van Alphen effect ". Physica B, 294-295, pp. 234-239.