Plane - Jason Mraz
Jason Mraz singing Plane at the Pearl in Las Vegas - May 9, 2009
Lucky - Jason Mraz and Colbie Caillat
Jason Mraz and surprise special guest Colbie Caillat singing Lucky at the Pearl in Las Vegas, May 9, 2009
Nanothermal trumpet: thermoacoustic sound source made with a suspended metal nanowire
From the paper "Suspended metal wire array as a thermoacoustic sound source," Appl. Phys. Lett. 95, 163102 (2009); by AO Niskanen, J. Hassel, M. Tikander, P. Maijala, L. Grönberg, P. Helistö, from VTT Technical Research Centre of Finland, PO BOX 1000, 02044 VTT, Finland. dx.doi.org A suspended metal wire array is used to produce high-pressure sound waves over a wide spectrum using the thermoacoustic effect. It is fabricated with an air-bridge arrays containing up to 2×105 wires covering an area of a few square centimeters. The supporting silicon wafer was isotropically plasma etched to release the wires thereby avoiding heat contact with the substrate. Sound pressure levels reaching 110 dB at a distance of 8 cm were demonstrated near 40 kHz in free field. The devices are also able to reproduce music and speech. They have potential for applications especially in the ultrasound range.
acoustics thermophysics thermoacoustics nanotechnology music sound
