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碩士 === 國立中央大學 === 土木工程研究所 === 94 === Abstract To realize the properties of acoustic waves propagating in soil medium, this research rely on the high sensitivity and excellent frequency response of condenser microphone to control the drop height of a steel ball dropping to the surface of sand as...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/59wtc7 |