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This article is based on the correlation of FFT(Fast Fourier Transform) to study the ultrasonic TOFD(Time Of Flight Diffraction) image registration algorithm and according to the principle of template matching algorithm, the process is simple and the registration locations are accurate, so that the detected images are clear and defected features are obvious. The subsequent sub-pixel image registration...
The groundwater sampling and nitrate nitrogen testing were carried out for 13 times from 2005 to 2011 in order to investigate the nitrate nitrogen dynamic change of groundwater in the intensive agricultural area of Daxing district and explore its control countermeasures. The results indicated that the mean value of nitrate nitrogen in groundwater of this area was 1.58 mg/L, which met the criterion...
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