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The paper describes the design of a rail defect detection system, which is suitable for 43 kg/m to 75 kg/m rails' in service inspection requirements. The defect acquisition module of the system is composed of some conventional probes and phased array probes. In defect signal processing module, FPGA was used to deal with the multi-channel defect data by using its parallel processing function. The system...
Polyphenol oxidase was treated with ascorbic acid, citric acid, sodium sulfite, potassium sorbate in combination with ultrasound. The effect of these treatments on the activity of PPO was studied. Results indicated that the separate treatment of ascorbic acid, citric acid, sodium sulfite could obviously inhibit PPO activity and could make a completely inhibition when the concentration was respectively...
In the ultrasonic test of rivets, flaw signal is often confused with the interface signal, which increases the difficulty of recognition by conventional methods. Aiming at these shortcomings, a novel method of rivet test based on entropy of instantaneous frequency (IF) was proposed. Algorithm of multi-correlation of time series was applied in the preprocessing of the ultrasonic signals, and IF and...
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