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基于多谱学技术剖析“白转黑”发用产品功效成分
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作者 夏泽敏 梁文耀 +6 位作者 黄敏涵 贾芳 陈彦君 孙剑 聂明霞 席绍峰 谭建华 《分析测试学报》 CAS CSCD 北大核心 2024年第7期971-977,共7页
组合采用色谱、质谱、光谱及能谱等分析技术,对“白转黑”发用产品中可能存在的功效成分进行筛查、鉴定和确认。采用高效液相色谱靶向筛查常见染发剂,气相色谱-质谱联用和超高效液相色谱-高分辨质谱非靶向筛查可能存在的染发和致黑成分... 组合采用色谱、质谱、光谱及能谱等分析技术,对“白转黑”发用产品中可能存在的功效成分进行筛查、鉴定和确认。采用高效液相色谱靶向筛查常见染发剂,气相色谱-质谱联用和超高效液相色谱-高分辨质谱非靶向筛查可能存在的染发和致黑成分。在优化的筛查条件下,超高效液相色谱-高分辨质谱识别出样品放置72 h后m/z 147.930 9处的峰强度出现明显下降。结合精准质量数、同位素分布及保留时间推测该成分为银离子。采用电感耦合等离子体质谱、离子色谱对银元素和硝酸根离子进行含量测定并结合原料性质剖析其来源,同时利用低真空热场发射扫描电镜对产品变黑成分进行确认,推测硝酸银可能是“白转黑”发用产品产生功效的重要原因。基于硝酸银为功效成分的“白转黑”发用产品在合规性和安全风险方面存在较大问题,亟需对该类产品加强监管。该文建立的组合式分析模式将为后续深入开展化妆品安全风险剖析提供技术参考。 展开更多
关键词 “白转黑”发用产品 多谱学技术 功效成分 安全风险
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Semi-supervised kernel FCM algorithm for remote sensing image classification
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作者 刘小芳 HeBinbin LiXiaowen 《High Technology Letters》 EI CAS 2011年第4期427-432,共6页
These problems of nonlinearity, fuzziness and few labeled data were rarely considered in traditional remote sensing image classification. A semi-supervised kernel fuzzy C-means (SSKFCM) algorithm is proposed to over... These problems of nonlinearity, fuzziness and few labeled data were rarely considered in traditional remote sensing image classification. A semi-supervised kernel fuzzy C-means (SSKFCM) algorithm is proposed to overcome these disadvantages of remote sensing image classification in this paper. The SSKFCM algorithm is achieved by introducing a kernel method and semi-supervised learning technique into the standard fuzzy C-means (FCM) algorithm. A set of Beijing-1 micro-satellite's multispectral images are adopted to be classified by several algorithms, such as FCM, kernel FCM (KFCM), semi-supervised FCM (SSFCM) and SSKFCM. The classification results are estimated by corresponding indexes. The results indicate that the SSKFCM algorithm significantly improves the classification accuracy of remote sensing images compared with the others. 展开更多
关键词 remote sensing image classification semi-supervised kernel fuzzy C-means (SSKFCM)algorithm Beijing-1 micro-satellite semi-supcrvisod learning tochnique kernel method
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