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Meshfree-based physics-informed neural networks for the unsteady Oseen equations
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作者 彭珂依 岳靖 +1 位作者 张文 李剑 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期151-159,共9页
We propose the meshfree-based physics-informed neural networks for solving the unsteady Oseen equations.Firstly,based on the ideas of meshfree and small sample learning,we only randomly select a small number of spatio... We propose the meshfree-based physics-informed neural networks for solving the unsteady Oseen equations.Firstly,based on the ideas of meshfree and small sample learning,we only randomly select a small number of spatiotemporal points to train the neural network instead of forming a mesh.Specifically,we optimize the neural network by minimizing the loss function to satisfy the differential operators,initial condition and boundary condition.Then,we prove the convergence of the loss function and the convergence of the neural network.In addition,the feasibility and effectiveness of the method are verified by the results of numerical experiments,and the theoretical derivation is verified by the relative error between the neural network solution and the analytical solution. 展开更多
关键词 physics-informed neural networks the unsteady Oseen equation convergence small sample learning
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Copper/Photoredox-Catalyzed Regioselective 1,4-Addition to 1,3-Enynes: A Convenient Access to Perfluoroalkylated Allenes
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作者 Ya Chen Quanyuan Wang +3 位作者 keyi peng Lilei Cheng Ziyi She Guo-Jun Deng 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第17期2023-2028,共6页
A general and broadly applicable copper and photoredox dual-catalyzed multicomponent 1,4-perfluoroalkylcyanation of 1,3-enynes has been developed.This protocol enjoys success with high regioselectivity,mild reaction c... A general and broadly applicable copper and photoredox dual-catalyzed multicomponent 1,4-perfluoroalkylcyanation of 1,3-enynes has been developed.This protocol enjoys success with high regioselectivity,mild reaction conditions,and excellent functional-group tolerance,allowing the facile synthesis of structurally diverse perfluoroalkylated allenes from readily available fluoroalkyl halides,1,3-enynes and TMscN in a one-pot manner.A reasonable mechanism has been proposed according to a series of control experiments. 展开更多
关键词 Fluorinated allenes 1 3-Enynes PHOTOREDOX FLUOROALKYLATION Multicomponent reactions Difunctionalization Radicals Regioselectivity
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