Papers by Author: Zhi Gang Yin

Abstract: The excellent mechanical properties of reactive powder concrete (RPC) are tested with under the condition of hot water conservation. Four batches of 19 specimens are prepared to determine the best ratio of RPC component materials. The variation of strength (compressive strength, flexural strength) of RPC with fly ash or tailings powder is studied with two batches of 10 specimens, and its optimal dosage is determined.

Abstract: Using wavelet transform, signal’s frequency properties of vibration induced by underground are analyzed A MATLAB program is developed in order to decompose and reconstruct acceleration signals. The law that acceleration signals change in time-spectral domain is got. Then the relations of vibration signal’s maximum acceleration, energy, frequency and spectral are discussed. In contrast to conventional Fourier Transform， wavelet analysis can provide the evolution of spectral features of a signal as this evolves in time. It is ideal for random and non-stationary signal analysis.