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基于主元分析的水轮机组导轴承异常诊断方法研究 被引量:3
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作者 赵明 梁俊宇 +1 位作者 李孟阳 杜景琦 《云南电力技术》 2019年第6期24-27,共4页
提出了一种基于主元分析(PCA)的水轮机组导轴承异常状态识别及诊断方法。该方法通过对水轮机组导轴承温度测点正常历史数据的主元分析,获得其主元空间与残差空间,并将其SPE统计和T2统计数据作为实际运行数据的阈值。在实际运行中,通过... 提出了一种基于主元分析(PCA)的水轮机组导轴承异常状态识别及诊断方法。该方法通过对水轮机组导轴承温度测点正常历史数据的主元分析,获得其主元空间与残差空间,并将其SPE统计和T2统计数据作为实际运行数据的阈值。在实际运行中,通过对运行数据的主元分析,计算得到SPE统计和T2统计值,如果统计量超过阈值,发出异常报警,并通过贡献图进行异常的诊断。通过实际运行数据的算例分析,表明该方法能够对水轮机组导轴承的异常准确识别与诊断。 展开更多
关键词 主元分析 水轮机组导轴承 异常诊断
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Characteristics of Elderly-Onset Rheumatoid Arthritis Patients With COVID-19
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作者 Lanlan Xiao Xinlei Ma +3 位作者 Jinzhi Wu junyu liang Weiqian Chen Jin Lin 《Infectious Microbes & Diseases》 CSCD 2024年第1期36-42,共7页
This study aimed to investigate the clinical characteristics of elderly-onset rheumatoid arthritis(EORA)patients with COVID-19.We ret-rospectively enrolled EORA patients diagnosed with COVID-19 from December 2022 thro... This study aimed to investigate the clinical characteristics of elderly-onset rheumatoid arthritis(EORA)patients with COVID-19.We ret-rospectively enrolled EORA patients diagnosed with COVID-19 from December 2022 through February 2023 and followed them up.Demographic characteristics of the patients and clinical data on COVID-19 were collected,and EORA-related data at the onset of rheu-matoid arthritis and during COVID-19 episodes were evaluated.A total of 102 EORA outpatients were enrolled and stratified into the COVID-19 group(n=60)and the non–COVID-19 group(n=42).In the COVID-19 group,56(93.3%)had symptoms,8(13.3%)had viral pneumonia,and 4(6.7%)developed severe COVID-19.Multivariate logistic regression analysis showed that lack of COVID-19 vac-cination(P=0.016 and P=0.030,respectively)and having interstitial lung disease(P=0.013 and P=0.001,respectively)were inde-pendent risk factors for viral pneumonia and severe COVID-19.Compared with the general population,EORA patients did not show significantly higher susceptibility to COVID-19 or a higher risk of severe COVID-19.However,EORA patients with interstitial lung disease require special consideration during COVID-19 episodes. 展开更多
关键词 COVID-19 elderly-onset rheumatoid arthritis COVID-19 vaccine interstitial lung disease
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