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Wheat Rows Detection Based on Machine Vision
Changdong Ma,Hongtu Zhao,Xiaojie Wang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.9
This study describes a new method for wheat rows detection at the middle growth stage based on Machine Vision. The algorithm includes three steps: (i) vegetation segmentation, (ii) centers points extraction and (iii) wheat rows detection. In the first step, color images were transformed into gray-level images and Otsu’s method was used to implement binarization. Based on the fact that the corresponding center points on two adjacent horizontal scanning lines can’t have a large deviation, in the second step, we firstly extracted the initial center points on the first scanning line based on a sliding window, and then gave a small shift based on positions of the initial center points which have been extracted on the previous scanning line to extract the center points for the next scanning line. Finally, the Randomized Hough transform (RHT) method was employed to locate the wheat rows. Test results indicate that the proposed method can effectively detect the wheat rows at the middle growth stage.
U-phosphate biomineralization induced by Bacillus sp. dw-2 in the presence of organic acids
Hong Tu,Guoyuan Yuan,Changsong Zhao,Jun Liu,Feize Li,Jijun Yang,Jiali Liao,Yuanyou Yang,Ning Liu 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5
In this paper, we systematically investigated the influence of some selected ligands on the U-phosphateprecipitation induced by soil bacteria. These organics are widely ranging from acetate, lactate, salicylateand citrate to oxalate. The results revealed that uranium could be biomineralized on bacteria asUO2HPO4$4H2O or (UO2)3(PO4)2$4H2O. The influence of organic ligands on the biomineralization hadclear-cut correlations with its complexation abilities to uranyl. It was clearly found that the U-phosphatebiomineralization was affected noticeably by the strong ligands (oxalate and citrate). Further studydiscovered that when the organic ligands were uncompetitive with biotic PO4 3 for uranyl, the transformationof uranyl species from b-UO2(OH)2 colloidal particles to free UO2 2 þ-ligands ions could facilitatethe U-phosphate biomineralization. However, when the organic ligands competed with biotic PO4 3 foruranyl, the U-phosphate biomineralization were inhibited. Our results highlight the importance ofcomplex interactions of strong organic ligands with uranyl during the bacterial precipitation of UePcompounds and thus for the mobilization and immobilization of radio-nuclides in the nature.