Rough set philosophy hinges on the granularity of data, which is used to build all its basic concepts, like approximations, dependencies, reduction etc. Genetic Algorithms provides a general frame to optimize problem ...Rough set philosophy hinges on the granularity of data, which is used to build all its basic concepts, like approximations, dependencies, reduction etc. Genetic Algorithms provides a general frame to optimize problem solution of complex system without depending on the domain of problem.It is robust to many kinds of problems.The paper combines Genetic Algorithms and rough sets theory to compute granular of knowledge through an example of information table. The combination enable us to compute granular of knowledge effectively.It is also useful for computer auto-computing and information processing.展开更多
Nicotine and nornicotine-typed compounds are well-known for its potential as insecticide.Some researches have shown that nicotine was highly toxic to Diaphorina citri Kuwayama,an invasive and fast spreading pest.Here ...Nicotine and nornicotine-typed compounds are well-known for its potential as insecticide.Some researches have shown that nicotine was highly toxic to Diaphorina citri Kuwayama,an invasive and fast spreading pest.Here we report the effects of nornicotine-typed insecticide against D.citri.Novel compounds A1-A8,B1-B28,C1-C18 and D1-D12 were synthesized by reported procedure.And bioassays indicated that some of these compounds exhibited good effects against D.citri.Compounds B2,B3,B8,B12,B13,B22,C5,C7,D5,and D9 exhibited the mortality up to 100%within 120 h in 50 mg/L.And further data shows that A2-5,A7,B1,B8,B20 and B22 showed rapid insecticidal activities against D.citri in 24 h with the low LC_(50)(LC_(50)<50 mg/L in 24 h,and LC_(50)<30 mg/L in 72 h).Nornicotine-typed derivatives exhibited activity against D.citri,and B8 and B22 exhibited the best insecticidal activity with an LC_(50)of 18.01.0,18.20.9 mg/L in 24 h,which had the lower cost than nicotine and showed the potential as powerful insecticides.展开更多
文摘Rough set philosophy hinges on the granularity of data, which is used to build all its basic concepts, like approximations, dependencies, reduction etc. Genetic Algorithms provides a general frame to optimize problem solution of complex system without depending on the domain of problem.It is robust to many kinds of problems.The paper combines Genetic Algorithms and rough sets theory to compute granular of knowledge through an example of information table. The combination enable us to compute granular of knowledge effectively.It is also useful for computer auto-computing and information processing.
基金the financial support from the National Natural Science Foundation of China(31901786,22078263)the National Key R&D Program of China(2021YFC2101500)+2 种基金the National Key R&D Program of China(2021SF-116,2023-YBSF-396)the Natural Science Foundation of Shaanxi Province(2022JQ-112)the China Postdoctoral Science Foundation(2021M692610).
文摘Nicotine and nornicotine-typed compounds are well-known for its potential as insecticide.Some researches have shown that nicotine was highly toxic to Diaphorina citri Kuwayama,an invasive and fast spreading pest.Here we report the effects of nornicotine-typed insecticide against D.citri.Novel compounds A1-A8,B1-B28,C1-C18 and D1-D12 were synthesized by reported procedure.And bioassays indicated that some of these compounds exhibited good effects against D.citri.Compounds B2,B3,B8,B12,B13,B22,C5,C7,D5,and D9 exhibited the mortality up to 100%within 120 h in 50 mg/L.And further data shows that A2-5,A7,B1,B8,B20 and B22 showed rapid insecticidal activities against D.citri in 24 h with the low LC_(50)(LC_(50)<50 mg/L in 24 h,and LC_(50)<30 mg/L in 72 h).Nornicotine-typed derivatives exhibited activity against D.citri,and B8 and B22 exhibited the best insecticidal activity with an LC_(50)of 18.01.0,18.20.9 mg/L in 24 h,which had the lower cost than nicotine and showed the potential as powerful insecticides.
