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If some noise is generated in the system, the coherence is less than unity since the total measured output includes not only the output power due to the measured input but also noise output due to the input noise and noise at the output side. The cause of decrease from mix design compressive strength of 1100... 顯示更多 If some noise is generated in the system, the coherence is less than unity since the total measured output includes not only the output power due to the measured input but also noise output due to the input noise and noise at the output side.

The cause of decrease from mix design compressive strength of 1100 kg/cm2 to actual compressive strength of 976 kg/cm2 was that fracture of cylinder started from the coarse aggregate, crushed stone ranging 19–25 mm in the result of observing the failure condition of cylinder tests.

The surface wave velocities were obtained from dispersion curves, which were plotted using Eqs. (2)–(4) based on cross power spectrum as shown in Fig. 5 as a typical dispersion curve.
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