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脉冲场励磁YBCO块材俘获磁通特性 被引量:3
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作者 岑冀娜 王家素 +2 位作者 宋宏海 郑珺 张龙财 《低温与超导》 CAS CSCD 北大核心 2006年第3期198-200,共3页
研究了熔融织构法制备的单畴高温超导YBaCuO块材在脉冲场下的俘获磁通特性。分别测试了YBCO块材在不同强度脉冲场下的俘获磁场,并对实验结果进行了分析。实验发现:YBCO块材在脉冲场输入电压小于300V时的俘获磁场,随着外加脉冲场强度的... 研究了熔融织构法制备的单畴高温超导YBaCuO块材在脉冲场下的俘获磁通特性。分别测试了YBCO块材在不同强度脉冲场下的俘获磁场,并对实验结果进行了分析。实验发现:YBCO块材在脉冲场输入电压小于300V时的俘获磁场,随着外加脉冲场强度的增加而增加;而脉冲输入电压大于300V时,俘获磁场并没有继续增加。实验获得的超导块材俘获磁场图形呈现出明显的十字结构,这是由于块材采用顶部籽晶熔融织构生长技术、存在五个生长区域、不同生长区域及边界处临界电流密度的不同而导致的。 展开更多
关键词 高温超导块材 俘获磁场 脉冲励磁 生长区域 生长区域边界
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Flotation bubble image segmentation based on seed region boundary growing 被引量:4
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作者 Zhang Guoying Zhu Hong Xu Ning 《Mining Science and Technology》 EI CAS 2011年第2期239-242,共4页
Segmenting blurred and conglutinated bubbles in a flotation image is done using a new segmentation method based on Seed Region and Boundary Growing(SRBG).Bright pixels located on bubble tops were extracted as the se... Segmenting blurred and conglutinated bubbles in a flotation image is done using a new segmentation method based on Seed Region and Boundary Growing(SRBG).Bright pixels located on bubble tops were extracted as the seed regions.Seed boundaries are divided into four curves:left-top,right-top,right-bottom, and left-bottom.Bubbles are segmented from the seed boundary by moving these curves to the bubble boundaries along the corresponding directions.The SRBG method can remove noisy areas and it avoids over- and under-segmentation problems.Each bubble is segmented separately rather than segmenting the entire flotation image.The segmentation results from the SRBG method are more accurate than those from the Watershed algorithm. 展开更多
关键词 Bubble image SEGMENTATION Seed area Region growing
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