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CLC number: S664.9; O42

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Received: 2006-03-02

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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.101 P.357~361

http://doi.org/10.1631/jzus.2006.AS0357


A study of acoustical characteristics of pine nut based on a fractal dimension method


Author(s):  Li Jian-Ping, Wei Bao-Gang

Affiliation(s):  School of Biosystem Engineering and Food Science, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   jpli@zju.edu.cn

Key Words:  Pine nut, Acoustical characteristic, Frequency spectrum, Fractal


Li Jian-Ping, Wei Bao-Gang. A study of acoustical characteristics of pine nut based on a fractal dimension method[J]. Journal of Zhejiang University Science A, 2006, 7(101): 357~361.

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author="Li Jian-Ping, Wei Bao-Gang",
journal="Journal of Zhejiang University Science A",
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pages="357~361",
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%I Zhejiang University Press & Springer
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T1 - A study of acoustical characteristics of pine nut based on a fractal dimension method
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EP - 361
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DOI - 10.1631/jzus.2006.AS0357


Abstract: 
The structure difference of pine nuts was tested on the basis of their acoustical characteristics in order to distinguish whether they were open or closed. In this experimental study, pine nuts were dropped from a certain height onto a ceramic board; the impinging sound was recorded by a microphone. The sound wave graph and frequency spectrum graph were obtained while the impinging sound was analyzed by computer. fractal dimension was calculated on sound wave graph and frequency spectrum graph of open and closed pine nuts. The result of test and analysis showed that the sound wave fractal dimension of open pine nuts was smaller than that of closed ones. The frequency spectrum fractal dimension of open pine nuts was larger than that of closed pine nuts. fractal dimension of sound wave and frequency spectrum could be used as important indices to distinguish whether the pine nut was open or not.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[4] Pearson, T.C., 2001. Detection of pistachio nuts with closed shells using impact acoustics. Applied Eng. in Agric., 17(2):249-253.

[5] Shmulevich, I., 1996. Detection of fruit firmness by frequency analysis. Transactions of the ASAE, 39(3):1047-1055.

[6] Sugiyama, J., Otobe, K., Hayashi, S., Usui, S., 1994. Firmness measurement of muskmelons by acoustic impulse transmission. Transaction of the ASAE, 37(4):1235-1241.

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[8] Zhang, J.Z., 1995. Fractal. Tsinghua University Press, Beijing (in Chinese).

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