In this paper, based on the idea of finite element method, the initial parametric method in bending, problem of a beam is extended to analyse the bar-system structure by employing Dirac function and llcavisidc step fu...In this paper, based on the idea of finite element method, the initial parametric method in bending, problem of a beam is extended to analyse the bar-system structure by employing Dirac function and llcavisidc step function.Then a new method for analysing the internal forces and deformations of bar-system structure in space is suggested by improving the mixed method in statically indeterminate structure.The inferred process and obtained answer will be more succinct and accurate when the problem of internal forces and deformations of bar-system structure is analysed by using the new method provided in this paper.展开更多
Visualization of internal deformation fields in crystalline materials helps bridge the gap between theoretical models and practical applications.Applying Bragg coherent diffraction imaging under X-ray dynamical diffra...Visualization of internal deformation fields in crystalline materials helps bridge the gap between theoretical models and practical applications.Applying Bragg coherent diffraction imaging under X-ray dynamical diffraction conditions provides a promising approach to the longstanding challenge of investigating the deformation fields in micron-sized crystals.Here,we present an automatic differentiation-based reconstruction method that integrates dynamical scattering theory to accurately reconstruct deformation fields in large crystals.Using this forward model,our simulated and experimental results demonstrate that three-dimensional local strain information inside a large crystal can be accurately reconstructed under coherent X-ray dynamical diffraction conditions with Bragg coherent X-ray diffraction imaging.These findings open an avenue for extending the investigation of local deformation fields to microscale crystals while maintaining nanoscale resolution,leveraging the enhanced coherence and brightness of advanced X-ray sources.展开更多
How to register and submit contributions： Authors are invited to submit their contributions on any of the conference topics. Submissions and conference registration can only be performed via the conference website：...How to register and submit contributions： Authors are invited to submit their contributions on any of the conference topics. Submissions and conference registration can only be performed via the conference website： http：//www.mpm2017.eu展开更多
文摘In this paper, based on the idea of finite element method, the initial parametric method in bending, problem of a beam is extended to analyse the bar-system structure by employing Dirac function and llcavisidc step function.Then a new method for analysing the internal forces and deformations of bar-system structure in space is suggested by improving the mixed method in statically indeterminate structure.The inferred process and obtained answer will be more succinct and accurate when the problem of internal forces and deformations of bar-system structure is analysed by using the new method provided in this paper.
基金Shanghai Advanced Research Institute was funded by the '100 Talents Project' of the Chinese Academy of SciencesWork at Brookhaven National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-SC0012704+1 种基金Measurements were conducted at the Advanced Photon Source (APS) beamline 34-ID-C, which was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357The beamline 34-ID-C was built with U.S. National Science Foundation grant DMR-9724294.
文摘Visualization of internal deformation fields in crystalline materials helps bridge the gap between theoretical models and practical applications.Applying Bragg coherent diffraction imaging under X-ray dynamical diffraction conditions provides a promising approach to the longstanding challenge of investigating the deformation fields in micron-sized crystals.Here,we present an automatic differentiation-based reconstruction method that integrates dynamical scattering theory to accurately reconstruct deformation fields in large crystals.Using this forward model,our simulated and experimental results demonstrate that three-dimensional local strain information inside a large crystal can be accurately reconstructed under coherent X-ray dynamical diffraction conditions with Bragg coherent X-ray diffraction imaging.These findings open an avenue for extending the investigation of local deformation fields to microscale crystals while maintaining nanoscale resolution,leveraging the enhanced coherence and brightness of advanced X-ray sources.
文摘How to register and submit contributions： Authors are invited to submit their contributions on any of the conference topics. Submissions and conference registration can only be performed via the conference website： http：//www.mpm2017.eu
