2MATIN G E. Determination of equivalent-circuit constants of piezoelectric resonators of moderately tow Q by absolute-admittance measurements [J]. Acoustical Society of Acerca,1954, 3 (26) :413-420.
3HAMANO K, YAMAGUCHI T. Interferometric method of measuring complex piezoelectric xonstants of crystal in a frequency range up to about 50KHz [J].JpnJ ApplPhys, 1979,18(5) :927-932.
4MORRIS W G. Physical properties of the electrical barriers in varistors[J].Journal of Vacuum Science and Technology, 1976, 13(4): 926-930.
5刘纪红.数字信号处理实验教程[M].沈阳:东北大学出版社,2004:76-77.
6PRIYA S. Advances in energy harvesting using tow profile piezoelectric transducers [J].J Electroceram, 2007,19(1) :165 182.