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Zhang, Wei (author), Qiao, Tiezhu (author), Pang, Y. (author), Yang, Yi (author), Chen, Hong (author), Hao, Guirong (author)When sapphire crystal is prepared with Kyropoulos method, the necking-down growth process is a key stage. Sapphire growth defect is a big problem in this stage. However, diagnosing growth defects is subject to the interference of workers subjectivity and accuracy always goes down. To address the problem, a novel defect diagnosis method is...journal article 2020