From the perspective of continuous perception and interaction between people and street–sideinterface,the relationship between continuity of street–side interface and street vitality is discussed in thepaper.Taking ...From the perspective of continuous perception and interaction between people and street–sideinterface,the relationship between continuity of street–side interface and street vitality is discussed in thepaper.Taking Minde Road in Nanchang City as an example,the continuity of the interface of Minde Roadis analyzed from the two elements of architectural interface and environmental interface,and the infl uenceof street interface continuity on behavior psychology and activities of people in the street is studied.Themethod of reforming and utilizing street–side interface and enhancing continuity of street–side interface isput forward to realize the improvement of street vitality.展开更多
With outstanding analytical performance and portability, miniature mass spectrometer is one of the most powerful tools for in-situ analysis. The miniaturization of mass spectrometers has lasted for more than ten years...With outstanding analytical performance and portability, miniature mass spectrometer is one of the most powerful tools for in-situ analysis. The miniaturization of mass spectrometers has lasted for more than ten years, during which a number of miniature mass spectrometers employing different techniques have been developed. Small-in-size, working at relatively high pressure region and capable of performing tandem mass spectrometry, ion trap is the most widely used mass analyzer in miniature mass spectrometer systems. The recent development of miniature ion trap mass spectrometer systems in the last ten years was reviewed in this paper. These instruments adopt different atmospheric pressure interfaces （APIs）, which are membrane inlets （MIs）, discontinuous atmospheric pressure interface （DAPI） and continuous atmospheric pressure interface （CAPI）. This review emphasizes on the mini mass spectrometry （MS） system that can be handheld by one person, but not the field-able ones that are too large to be hand-portable.展开更多
After the field equations and the snonumuoo conditions between the interfaces for 3D eddy current problems Under various gauges were discussed, it was pointed cut in this paper that using the magnetic vector potentia...After the field equations and the snonumuoo conditions between the interfaces for 3D eddy current problems Under various gauges were discussed, it was pointed cut in this paper that using the magnetic vector potential A. the electric scalar potential and Coulomb gauge △ .A = 0 in eddy current regions and using the magntetic scalar potential Ω in the non-conducting regions are more suitable. All field equations, the boundary conditions, the interface continuity conditions and the corresponding variational principle of this method are also given展开更多
The accurate reconstruction of stress fields in rock masses containing hard inclusions(such as pyrite nodules)is a critical challenge in mining engineering,directly affecting the stability assessment of working faces ...The accurate reconstruction of stress fields in rock masses containing hard inclusions(such as pyrite nodules)is a critical challenge in mining engineering,directly affecting the stability assessment of working faces and the prevention and control of engineering hazards.Traditional methods often face challenges such as high mesh dependency,complex pre-processing,and low computational efficiency when dealing with sharp variations in material properties.This study develops a physics-informed neural network(PINN)framework to solve both forward and inverse problems of stress fields in coal masses containing elastic inclusions.First,the accuracy and robustness of PINN in solving partial differential equations are verified through the Burgers'equation.Second,the PINN construction and network architecture are presented for three typical linear elastic problems in solid mechanics:2D plane strain,2D plane stress,and 3D elasticity,where the displacement-form governing equations are used to formulate the partial differential equation(PDE)loss.To address the mechanical discontinuities at the interfaces between inclusions and the matrix,an innovative multi-network PINN architecture is proposed,which adopts independent sub-networks to characterize the mechanical responses of the matrix and inclusions separately,and introduces interface coupling conditions of displacement continuity and traction equilibrium,significantly improving the prediction accuracy of interfacial stress concentration.The effects of elastic modulus ratio(ranging from 2 to 20)and multi-inclusion spatial configurations(spacing,arrangement)on stress redistribution are investigated,revealing the mechanisms and conditions for phenomena such as stress concentration,stress arching,and stress shielding.The research demonstrates that PINN provides a powerful new tool for the accurate reconstruction of stress fields and parameter identification in complex heterogeneous geological materials.展开更多
文摘From the perspective of continuous perception and interaction between people and street–sideinterface,the relationship between continuity of street–side interface and street vitality is discussed in thepaper.Taking Minde Road in Nanchang City as an example,the continuity of the interface of Minde Roadis analyzed from the two elements of architectural interface and environmental interface,and the infl uenceof street interface continuity on behavior psychology and activities of people in the street is studied.Themethod of reforming and utilizing street–side interface and enhancing continuity of street–side interface isput forward to realize the improvement of street vitality.
基金supported by the National Natural Science Foundation of China (Nos. 21475010, 61635003)Beijing Natural Science Foundation (No. 16L00065)State Key Laboratory Explosion Science and Technology (No. YBKT16-17)
文摘With outstanding analytical performance and portability, miniature mass spectrometer is one of the most powerful tools for in-situ analysis. The miniaturization of mass spectrometers has lasted for more than ten years, during which a number of miniature mass spectrometers employing different techniques have been developed. Small-in-size, working at relatively high pressure region and capable of performing tandem mass spectrometry, ion trap is the most widely used mass analyzer in miniature mass spectrometer systems. The recent development of miniature ion trap mass spectrometer systems in the last ten years was reviewed in this paper. These instruments adopt different atmospheric pressure interfaces （APIs）, which are membrane inlets （MIs）, discontinuous atmospheric pressure interface （DAPI） and continuous atmospheric pressure interface （CAPI）. This review emphasizes on the mini mass spectrometry （MS） system that can be handheld by one person, but not the field-able ones that are too large to be hand-portable.
文摘After the field equations and the snonumuoo conditions between the interfaces for 3D eddy current problems Under various gauges were discussed, it was pointed cut in this paper that using the magnetic vector potential A. the electric scalar potential and Coulomb gauge △ .A = 0 in eddy current regions and using the magntetic scalar potential Ω in the non-conducting regions are more suitable. All field equations, the boundary conditions, the interface continuity conditions and the corresponding variational principle of this method are also given
基金funded by the State Key Laboratory of Intelligent Optimized Manufacturing in Mining&Metallurgy Process Open Research Fund(Grant Nos.JTKY202404622,JTKY202504162,and BGRIMMKZSKL-2023-12)。
文摘The accurate reconstruction of stress fields in rock masses containing hard inclusions(such as pyrite nodules)is a critical challenge in mining engineering,directly affecting the stability assessment of working faces and the prevention and control of engineering hazards.Traditional methods often face challenges such as high mesh dependency,complex pre-processing,and low computational efficiency when dealing with sharp variations in material properties.This study develops a physics-informed neural network(PINN)framework to solve both forward and inverse problems of stress fields in coal masses containing elastic inclusions.First,the accuracy and robustness of PINN in solving partial differential equations are verified through the Burgers'equation.Second,the PINN construction and network architecture are presented for three typical linear elastic problems in solid mechanics:2D plane strain,2D plane stress,and 3D elasticity,where the displacement-form governing equations are used to formulate the partial differential equation(PDE)loss.To address the mechanical discontinuities at the interfaces between inclusions and the matrix,an innovative multi-network PINN architecture is proposed,which adopts independent sub-networks to characterize the mechanical responses of the matrix and inclusions separately,and introduces interface coupling conditions of displacement continuity and traction equilibrium,significantly improving the prediction accuracy of interfacial stress concentration.The effects of elastic modulus ratio(ranging from 2 to 20)and multi-inclusion spatial configurations(spacing,arrangement)on stress redistribution are investigated,revealing the mechanisms and conditions for phenomena such as stress concentration,stress arching,and stress shielding.The research demonstrates that PINN provides a powerful new tool for the accurate reconstruction of stress fields and parameter identification in complex heterogeneous geological materials.
