[Front cover]

The cover shows Local Temporal Coherence Images of Diffuse Ultrasonic Waves Showing Progression of Material Damage. These successive images show the local temporal coherence between a reference diffuse ultrasonic signal and subsequently measured signals after progressive introduction of artificial damage. The measurements were obtained using piezoelectric sensors permanently bonded to an aluminum specimen, and the loss in coherence as a function of time-from-transmit correlates to the amount of damage. Images courtesy of Jennifer E. Michaels and Thomas E. Michaels, Georgia Institute of Technology, School of Electrical & Computer Engineering, Atlanta, GA. See article on page 1769.