Research Article
Development of Frequencies from Hertz to Gigahertz in Ultrasonic Technique
National Institute of Nuclear Research, Mexico-Toluca Highway km 36.5, Salazar, Mex., Mexico
Samuel Siles
Research Center in Applied Science and Advanced Technology of the National Polytechnic Institute, Legaria 694, Col., Irrigaci�n, CP 11500, Mexico
Alfredo Cruz
Research and Advanced Studies Center of the Xacional Av Polytechnic Institute. National Polytechnic Institute 2508,CP 07000, Mexico
N. Juan Azorin
Metropolitan Autonomous University-lztapalapa Av. San Rafael Atlixco 1 86: Col. Vicentina, CP 09340, Mexico