TiN coating was prepared by reactive plasma spraying in the Ar and N2 containing plasma jet. The resuits of XRD show that the TiN coating consists of TiN and Ti3 O, neither Ti2 N nor TiO2 phases. The toughening mechan...TiN coating was prepared by reactive plasma spraying in the Ar and N2 containing plasma jet. The resuits of XRD show that the TiN coating consists of TiN and Ti3 O, neither Ti2 N nor TiO2 phases. The toughening mechanism was characterized by analyzing the SEM morphologies of the TiN coating＇s indentation of microhardness and fracture surfaces. The results indicate that the coating possesses a high toughness. The adhesion strength among the TiN layers is 25.88 MPa, which is slightly lower than that of the Ni/AI bonding coating. The oxidation process of the RPS TiN coating is TiN→Ti3 O→TiO2.展开更多
目的评价臂间收缩压差(IASBPD)联合臂踝指数(BAI)筛查锁骨下动脉狭窄的价值。方法入选2017年10月至2018年10月在阜外医院行选择性弓上动脉造影,并于造影前5 d内完成同步四肢血压测量的所有患者,收集临床资料。由不知晓患者资料的研究者...目的评价臂间收缩压差(IASBPD)联合臂踝指数(BAI)筛查锁骨下动脉狭窄的价值。方法入选2017年10月至2018年10月在阜外医院行选择性弓上动脉造影,并于造影前5 d内完成同步四肢血压测量的所有患者,收集临床资料。由不知晓患者资料的研究者阅读锁骨下动脉造影结果,诊断金标准采用直径狭窄≥50%。应用受试者工作特征(ROC)曲线分析IASBPD和BAI的最佳诊断切点,评估二者联合诊断价值。结果共入选317例患者(634条锁骨下动脉),男性246例,占77.6%,年龄39~84(64.2±8.5)岁。患者133例锁骨下动脉直径狭窄≥50%,其中单侧狭窄100例,占75.2%,双侧狭窄33例,占24.8%。IASBPD和BAI的ROC曲线下面积分别为0.83(95%CI 0.79~0.88,P<0.001)和0.65(95%CI 0.60~0.71,P<0.001),最佳诊断切点分别为9 mm Hg和0.8。诊断锁骨下动脉狭窄,IASBPD≥9 mm Hg的敏感度为57.1%,特异度为94.0%,阳性预测值为87.4%,阴性预测值为75.2%;BAI≤0.8的敏感度为48.1%,特异度为86.4%,阳性预测值为71.9%,阴性预测值为69.7%。IASBPD联合BAI较二者单独诊断的敏感度增高至68.4%,特异度稍降低至82.6%。结论IASBPD联合BAI可提高筛查锁骨下动脉狭窄的敏感度。展开更多
基金Item Sponsored by Natural Science Foundation of China (50472033)Natural Science Foundation of Hebei Province of China (503037)
文摘TiN coating was prepared by reactive plasma spraying in the Ar and N2 containing plasma jet. The resuits of XRD show that the TiN coating consists of TiN and Ti3 O, neither Ti2 N nor TiO2 phases. The toughening mechanism was characterized by analyzing the SEM morphologies of the TiN coating＇s indentation of microhardness and fracture surfaces. The results indicate that the coating possesses a high toughness. The adhesion strength among the TiN layers is 25.88 MPa, which is slightly lower than that of the Ni/AI bonding coating. The oxidation process of the RPS TiN coating is TiN→Ti3 O→TiO2.
文摘目的评价臂间收缩压差(IASBPD)联合臂踝指数(BAI)筛查锁骨下动脉狭窄的价值。方法入选2017年10月至2018年10月在阜外医院行选择性弓上动脉造影,并于造影前5 d内完成同步四肢血压测量的所有患者,收集临床资料。由不知晓患者资料的研究者阅读锁骨下动脉造影结果,诊断金标准采用直径狭窄≥50%。应用受试者工作特征(ROC)曲线分析IASBPD和BAI的最佳诊断切点,评估二者联合诊断价值。结果共入选317例患者(634条锁骨下动脉),男性246例,占77.6%,年龄39~84(64.2±8.5)岁。患者133例锁骨下动脉直径狭窄≥50%,其中单侧狭窄100例,占75.2%,双侧狭窄33例,占24.8%。IASBPD和BAI的ROC曲线下面积分别为0.83(95%CI 0.79~0.88,P<0.001)和0.65(95%CI 0.60~0.71,P<0.001),最佳诊断切点分别为9 mm Hg和0.8。诊断锁骨下动脉狭窄,IASBPD≥9 mm Hg的敏感度为57.1%,特异度为94.0%,阳性预测值为87.4%,阴性预测值为75.2%;BAI≤0.8的敏感度为48.1%,特异度为86.4%,阳性预测值为71.9%,阴性预测值为69.7%。IASBPD联合BAI较二者单独诊断的敏感度增高至68.4%,特异度稍降低至82.6%。结论IASBPD联合BAI可提高筛查锁骨下动脉狭窄的敏感度。
