A [Pd（1-tritylimidazole）2Cl2] complex was synthesized and characterized by IH and 13C NMR spectroscopy, elemental analysis, and X-ray crystallography. The X-ray analysis confirmed that the Pd（II） has a four-coordi...A [Pd（1-tritylimidazole）2Cl2] complex was synthesized and characterized by IH and 13C NMR spectroscopy, elemental analysis, and X-ray crystallography. The X-ray analysis confirmed that the Pd（II） has a four-coordinated square planar structure. The palladium complex was used to carry out Suzuki-Miyaura coupling reactions of aryl chlorides with a variety of phenylboronic acids in i-PrOH-H20 （1 ： 1, V ： V） at room temperature and Heck coupling reactions of aryl halides with methyl acrylate in DMF at 110℃. High yields of the cross-coupling products were obtained.展开更多
Wheat head detection can measure wheat traits such as head density and head characteristics.Standard wheat breeding largely relies on manual observation to detect wheat heads,yielding a tedious and inefficient procedu...Wheat head detection can measure wheat traits such as head density and head characteristics.Standard wheat breeding largely relies on manual observation to detect wheat heads,yielding a tedious and inefficient procedure.The emergence of affordable camera platforms provides opportunities for deploying computer vision(CV)algorithms in wheat head detection,enabling automated measurements of wheat traits.Accurate wheat head detection,however,is challenging due to the variability of observation circumstances and the uncertainty of wheat head appearances.In this work,we propose a simple but effective idea—dynamic color transform(DCT)—for accurate wheat head detection.展开更多
基金This work was supported by the National Natural Science Foundation of China （No. 21102102）, the Natural Science Foundation of Tianjin （No. 16JCYBJC 19700）, and the innovation team plan of the Tianjin Education Committee （No. TD 12-5037）.
文摘A [Pd（1-tritylimidazole）2Cl2] complex was synthesized and characterized by IH and 13C NMR spectroscopy, elemental analysis, and X-ray crystallography. The X-ray analysis confirmed that the Pd（II） has a four-coordinated square planar structure. The palladium complex was used to carry out Suzuki-Miyaura coupling reactions of aryl chlorides with a variety of phenylboronic acids in i-PrOH-H20 （1 ： 1, V ： V） at room temperature and Heck coupling reactions of aryl halides with methyl acrylate in DMF at 110℃. High yields of the cross-coupling products were obtained.
基金This work was supported in part by the National Natural Science Foundation of China under Grant 61876211by the Chinese Fundamental Research Funds for the Central Universities under Grant No.2021XXJS095.
文摘Wheat head detection can measure wheat traits such as head density and head characteristics.Standard wheat breeding largely relies on manual observation to detect wheat heads,yielding a tedious and inefficient procedure.The emergence of affordable camera platforms provides opportunities for deploying computer vision(CV)algorithms in wheat head detection,enabling automated measurements of wheat traits.Accurate wheat head detection,however,is challenging due to the variability of observation circumstances and the uncertainty of wheat head appearances.In this work,we propose a simple but effective idea—dynamic color transform(DCT)—for accurate wheat head detection.
