Al-Sarraf__'A_Study_of_Ultrasonic_Metal_Welding'_(thesis_2013).pdf
	Woo et al [49] conducted a theoretical study of an acoustic horn which was excited by high ultrasonic power. The
optimal dimensions of the horn were investigated in order to achieve high vibration. p. 20
	[49] = J. Woo, Y. Roh, K. Kang, and S. Lee, "Design and Construction of an Acoustic Horn for High Power Ultrasonic Transducers," Ultrasonics Symposium, 2006. IEEE, pp. 1922-1925, 2006.
	
-------------------- Composite horns -------------------
Kevin O'Shea - "Design of Composite Horns Using Finite Element Analysis", The Journal of the Acoustical Society of America (Impact Factor: 1.5). 01/1991; 90. DOI: 10.1121/1.401513 -- Appears to have been a presentation (see http://scitation.aip.org/docserver/fulltext/asa/journal/jasa/90/4/1.401513.pdf?expires=1453290634&id=id&accname=guest&checksum=3194E52F387E81CE91F4D325653A3C5D)

-------------------- Interesting horns -------------------
Rotary -
	http://aurizonultrasonics.com/technologies-capabilities/rotary-processing/ (Thomas Ehlert, VP RD&E; linkedin -- Aurizon origins in Kimberly Clarke)