The development of an efficient moving target detection algorithm in IR-image sequence is considered one of the most critical research fields in modern IRST (Infrared Search and Track) systems, especially when dealing...The development of an efficient moving target detection algorithm in IR-image sequence is considered one of the most critical research fields in modern IRST (Infrared Search and Track) systems, especially when dealing with moving dim point targets. In this paper we propose a new approach in processing of the Infrared image sequence for moving dim point targets detection built on the transformation of the IR-image sequence into 4-vectors for each frame in the sequence. The results of testing the proposed approach on a set of frames having a simple single pixel target performing a different motion patterns show the validity of the approach for detecting the motion, with simplicity in calculation and low time consumption.展开更多
On the basis of the structure of natural product lansiumamide B(1),a total of 27 novel cis-enamide compounds were designed and synthesized via Intermediate Derivatization Method.Their chemical structures were characte...On the basis of the structure of natural product lansiumamide B(1),a total of 27 novel cis-enamide compounds were designed and synthesized via Intermediate Derivatization Method.Their chemical structures were characterized by 1H and 13C nuclear magnetic resonance and high-resolution mass spectrometry.The in vitro antifungal activities against Sclerotinia sclerotiorum,Thanatephorus cucumeris and Botrytis cinerea were evaluated by the mycelium linear growth rate method.Most of the compounds showed some activity against each of the fungi at 25 or 50μg/mL.The relationship between structure and antifungal activity was also discussed,which showed the cinnamic double bond was critical to maintain the antifungal activity.Notably,among the title compounds,3e and 3h could inhibit mycelia growth of Botrytis cinerea by approximately 50%(EC_(50))at 39.17 and 41.25μg/mL respectively,which showed better antifungal activity than lansiumamide B(1)with more concise chemical structure.The present study pointed out the correct direction for the development and optimization of lansiumamide B derivatives as potential inhibitors of pathogenic fungi.展开更多
文摘The development of an efficient moving target detection algorithm in IR-image sequence is considered one of the most critical research fields in modern IRST (Infrared Search and Track) systems, especially when dealing with moving dim point targets. In this paper we propose a new approach in processing of the Infrared image sequence for moving dim point targets detection built on the transformation of the IR-image sequence into 4-vectors for each frame in the sequence. The results of testing the proposed approach on a set of frames having a simple single pixel target performing a different motion patterns show the validity of the approach for detecting the motion, with simplicity in calculation and low time consumption.
基金financially supported by National Key R&D Program of China(2022 YFD1400700)the Natural Science Foundation of Fujian Province of China(2020J01526)+1 种基金the Foundation of Education Department of Fujian Province of China(JAT21006)the Foundation of Key Laboratory of Biopesticide and Chemical Biology(Keylab2020-03).
文摘On the basis of the structure of natural product lansiumamide B(1),a total of 27 novel cis-enamide compounds were designed and synthesized via Intermediate Derivatization Method.Their chemical structures were characterized by 1H and 13C nuclear magnetic resonance and high-resolution mass spectrometry.The in vitro antifungal activities against Sclerotinia sclerotiorum,Thanatephorus cucumeris and Botrytis cinerea were evaluated by the mycelium linear growth rate method.Most of the compounds showed some activity against each of the fungi at 25 or 50μg/mL.The relationship between structure and antifungal activity was also discussed,which showed the cinnamic double bond was critical to maintain the antifungal activity.Notably,among the title compounds,3e and 3h could inhibit mycelia growth of Botrytis cinerea by approximately 50%(EC_(50))at 39.17 and 41.25μg/mL respectively,which showed better antifungal activity than lansiumamide B(1)with more concise chemical structure.The present study pointed out the correct direction for the development and optimization of lansiumamide B derivatives as potential inhibitors of pathogenic fungi.
