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两圆柱体结合面的接触热导分形模型研究 被引量:5
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作者 孙献光 孟春晓 段田堂 《固体力学学报》 CAS CSCD 北大核心 2019年第6期552-559,共8页
基于三维分形理论,在考虑微凸体的弹性变形、弹塑性变形和塑性变形的基础上,建立了两圆柱体结合面接触热导分形模型.通过数值仿真,分析了分形维数,分形尺度参数、圆柱体曲率半径和接触类型对接触热导的影响.研究结果表明:接触热导随着... 基于三维分形理论,在考虑微凸体的弹性变形、弹塑性变形和塑性变形的基础上,建立了两圆柱体结合面接触热导分形模型.通过数值仿真,分析了分形维数,分形尺度参数、圆柱体曲率半径和接触类型对接触热导的影响.研究结果表明:接触热导随着分形维数的增大而增大,随着分形尺度参数的增大而减小;相同参数下,内接触比外接触的接触热导要大;此外,当固定其中一个圆柱体的曲率半径时,随着另一个圆柱体曲率半径的增大,接触热导增大.该模型为开展齿轮等曲面接触热导的研究提供了理论基础. 展开更多
关键词 分形理论 接触热导 弹塑性变形 圆柱体
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Cytochrome P450s in algae:Bioactive natural product biosynthesis and light-driven bioproduction
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作者 Shanmin Zheng Jiawei Guo +5 位作者 Fangyuan Cheng Zhengquan Gao Lei Du chunxiao meng Shengying Li Xingwang Zhang 《Acta Pharmaceutica Sinica B》 SCIE CAS CSCD 2022年第6期2832-2844,共13页
Algae are a large group of photo synthetic organisms responsible for approximately half of the earth’s total photosynthesis.In addition to their fundamental ecological roles as oxygen producers and as the food base f... Algae are a large group of photo synthetic organisms responsible for approximately half of the earth’s total photosynthesis.In addition to their fundamental ecological roles as oxygen producers and as the food base for almost all aquatic life,algae are also a rich source of bioactive natural products,including several clinical drugs.Cytochrome P450 enzymes(P450s) are a superfamily of biocatalysts that are extensively involved in natural product biosynthesis by mediating various types of reactions.In the post-genome era,a growing number of P450 genes have been discovered from algae,indicating their important roles in algal life-cycle.However,the functional studies of algal P450s remain limited.Benefitting from the recent technical advances in algae cultivation and genetic manipulation,the researches on P450s in algal natural product biosynthesis have been approaching to a new stage.Moreover,some photoauto trophic algae have been developed into "photo-bioreactors" for heterologous P450s to produce high-value added pharmaceuticals and chemicals in a carbon-neutral or carbon-negative manner.Here,we comprehensively review these advances of P450 studies in algae from 2000 to 2021. 展开更多
关键词 Natural product biosynthesis Algal pharmaceuticals Cytochrome P450 enzymes ALGAE Light-driven bioproduction
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