Within the blind Angle area of the Amalog Sonoscope leakage flux inspection system, the rotary rolling caused flaws in seamless steel pipes were missed quite often due to low detection sensitivity.
无缝钢管表面的斜轧缺陷，因位于漏磁纵横向检测机组的盲角区域，检测灵敏度低，容易漏检。
2
Methods Multi-central randomized blind controlled trials were used, and 180 cases were randomly divided into a rolling needle group and a medication group, 90 cases in each group.
方法：采用多中心随机盲法对照试验，180名患者随机分成滚针组和药物组各90例。
3
Combined the advantage of empirical mode decomposition (EMD) and principle component analysis (PCA), a blind separation method of rolling bearing faults is proposed based on EMD and PCA.