Parametric simulation of electron backscatter diffraction patterns through generative models

Recently,discriminative machine learning models have been widely used to predict various attributes from Electron Backscatter Diffraction(EBSD)patterns.However,there has never been any generative model developed for EBSD pattern simulation.On one hand,the training of generative models is much harder than that of discriminative ones;On the other hand,numerous variables affecting EBSD pattern formation make the input space high-dimensional and its relationship with the distribution of backscattered electrons complicated.In this study,we propose a framework(EBSD-CVAE/GAN)with great flexibility and scalability to realize parametric simulation of EBSD patterns.Compared with the frequently used forward model,EBSD-CVAE/GAN can take variables more than just orientation and generate corresponding EBSD patterns in a single run.The accuracy and quality of generated patterns are systematically evaluated.The model does not only summarize a distribution of backscattered electrons at a higher level,but also mitigates data scarcity in this field.

材料结构——晶体学、衍射和对称性引论

该书是一本自成一体的教材，涵盖了晶体学、对称性和衍射的基本知识，陈述严格并易于阅读。侧重于结合晶体结构的可视化插图和晶体学的数学理论来理解各种材料的复杂性。本书的上半部分系统地描述了晶体学的基础知识，讨论了化学键、晶体体系、对称性、点群和衍射的概念。下半部分内容则更加前沿，阐述了如何通过测定物质结构来研究各种材料，如金属、陶瓷、共价键、无定形、分子固体和纳米材料。并且还介绍了晶体学的几何原理和计算技术。