The obtained values of the exponent α , clearly indicating a difference between small and high values of the water content, show an increasing trend of α up to θ slightly higher than 0.3 (i.e., the value at which the θ ( ε r ) experimental points show a trend change), and then slightly decreasing for higher values.
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Experimental Determination of TDR Calibration Relationship for Pyroclastic Ashes of Campania (Italy).
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