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By comprehensive study of reservoir and source rock distribution, petrology and geochemistry, the tight oil and its exploration potential was analyzed in the Triassic Yanchang Formation, Ordos Basin. The Triassic Yanchang Formation is rich in low permeability reservoirs. The proved geological reserves of tight oil, with the permeability less than 2×10 −3 μm 2 , is about two billion...
Flaws in train wheel could cause wheel broken in highspeed running process, which seriously affect the traffic safety. Detection of wheel flaws is important and urgent. A fuzzy pattern recognition method is applied to flaw classification in ultrasonic transverse wave detection of wheel defect. The received flaw echoes are pre-processed by wavelet filtering and Fourier transform. The feature values...
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