B2-ordered Fe3Al single crystals with various orientations were deformed in tension at room temperature in vacuum. The shape of shear stress-strain curves and work hardening rates were found to be strongly dependent o...B2-ordered Fe3Al single crystals with various orientations were deformed in tension at room temperature in vacuum. The shape of shear stress-strain curves and work hardening rates were found to be strongly dependent on the orientation. The formation of the five different work hardening stages were considered to be related to the number of operative slip systems, the effect of secondary slip systems and the dissociation of the twofold superdislocation. Stage I is an easy glide stage corresponding to single slip. Stage II, with high hardening rate, often corresponds to the existence of conjugate slip systems. Stage III, with relatively low hardening rate, corresponds to the weaker hardening of secondary slip systems. Stage IV, with the highest hardening rate, is not only related to multiple slip but also the dissociation of twofold superdislocations and the moving of superpartials with an antiphase boundary (APB) trap. Stages V, with a negative hardening rate, may be caused by the cross slip of single dissociated superdislocation. The number of stages and the work hardening rate of the same stage were also found to change significantly, when the tensile orientation lies in different orientation regions.展开更多
目的讨论血清前B细胞克隆增强因子(pre-B cell colony-enhancing factor,PBEF)、Kruppel样转录因子2(kruppel like factor 2,KLF2)、白介素-26(Interleukin-26,IL-26)与重症肺炎(severe pneumonia,SP)患儿病情严重程度及预后转归的关系...目的讨论血清前B细胞克隆增强因子(pre-B cell colony-enhancing factor,PBEF)、Kruppel样转录因子2(kruppel like factor 2,KLF2)、白介素-26(Interleukin-26,IL-26)与重症肺炎(severe pneumonia,SP)患儿病情严重程度及预后转归的关系。方法选择西安市儿童医院2023年3月-2025年3月收治的180例SP患儿作为研究对象,使用ELISA试剂盒分别检测血清中PBEF、KLF2、IL-26的蛋白水平;根据急性生理与慢性健康评分II(acute physiology and chronic health score,APACHEII评分)判定患儿的病情严重程度并分组为非危重症组(n=60)、危重症组(n=75)和极危重症组(n=45);根据SP患儿预后分为预后良好组(n=127)和预后不良组(n=53);血清PBEF、KLF2、IL-26水平与APACHEII评分的相关性采用Pearson法分析;多因素Logistics回归分析影响SP患儿预后转归的因素;ROC曲线分析血清PBEF、KLF2、IL-26水平对SP患儿预后转归的预测价值。结果与非危重症组比较,危重症组、极危重症组APACHEII评分及血清PBEF、IL-26水平升高(P<0.05),血清KLF2水平均低(P<0.05);与危重症组比较,极危重症组APACHEII评分及血清PBEF、IL-26水平升高,血清KLF2水平降低(P<0.05);SP患儿血清PBEF、IL-26水平与APACHEII评分呈正相关,血清KLF2水平与APACHEII评分呈负相关(P<0.05);预后不良组较预后良好组极危重症患者比例、APACHEII评分及血清PBEF、IL-26水平升高,血清KLF2水平降低(P<0.05);血清PBEF、IL-26水平升高,KLF2水平降低是SP患儿发生预后不良的危险因素(P<0.05);血清PBEF、KLF2、IL-26水平单独及联合预测患儿预后不良的AUC分别为0.769、0.820、0.814、0.933,三者联合预测价值更高(Z=4.112、3.893、4.035,P<0.001)。结论伴随SP患儿病情严重程度的增加,血清PBEF、IL-26水平升高,KLF2水平降低,三者可作为预测患儿预后转归的指标。展开更多
基金This work was supported by the China Research and Development Fund (No. 59681005)
文摘B2-ordered Fe3Al single crystals with various orientations were deformed in tension at room temperature in vacuum. The shape of shear stress-strain curves and work hardening rates were found to be strongly dependent on the orientation. The formation of the five different work hardening stages were considered to be related to the number of operative slip systems, the effect of secondary slip systems and the dissociation of the twofold superdislocation. Stage I is an easy glide stage corresponding to single slip. Stage II, with high hardening rate, often corresponds to the existence of conjugate slip systems. Stage III, with relatively low hardening rate, corresponds to the weaker hardening of secondary slip systems. Stage IV, with the highest hardening rate, is not only related to multiple slip but also the dissociation of twofold superdislocations and the moving of superpartials with an antiphase boundary (APB) trap. Stages V, with a negative hardening rate, may be caused by the cross slip of single dissociated superdislocation. The number of stages and the work hardening rate of the same stage were also found to change significantly, when the tensile orientation lies in different orientation regions.
文摘目的讨论血清前B细胞克隆增强因子(pre-B cell colony-enhancing factor,PBEF)、Kruppel样转录因子2(kruppel like factor 2,KLF2)、白介素-26(Interleukin-26,IL-26)与重症肺炎(severe pneumonia,SP)患儿病情严重程度及预后转归的关系。方法选择西安市儿童医院2023年3月-2025年3月收治的180例SP患儿作为研究对象,使用ELISA试剂盒分别检测血清中PBEF、KLF2、IL-26的蛋白水平;根据急性生理与慢性健康评分II(acute physiology and chronic health score,APACHEII评分)判定患儿的病情严重程度并分组为非危重症组(n=60)、危重症组(n=75)和极危重症组(n=45);根据SP患儿预后分为预后良好组(n=127)和预后不良组(n=53);血清PBEF、KLF2、IL-26水平与APACHEII评分的相关性采用Pearson法分析;多因素Logistics回归分析影响SP患儿预后转归的因素;ROC曲线分析血清PBEF、KLF2、IL-26水平对SP患儿预后转归的预测价值。结果与非危重症组比较,危重症组、极危重症组APACHEII评分及血清PBEF、IL-26水平升高(P<0.05),血清KLF2水平均低(P<0.05);与危重症组比较,极危重症组APACHEII评分及血清PBEF、IL-26水平升高,血清KLF2水平降低(P<0.05);SP患儿血清PBEF、IL-26水平与APACHEII评分呈正相关,血清KLF2水平与APACHEII评分呈负相关(P<0.05);预后不良组较预后良好组极危重症患者比例、APACHEII评分及血清PBEF、IL-26水平升高,血清KLF2水平降低(P<0.05);血清PBEF、IL-26水平升高,KLF2水平降低是SP患儿发生预后不良的危险因素(P<0.05);血清PBEF、KLF2、IL-26水平单独及联合预测患儿预后不良的AUC分别为0.769、0.820、0.814、0.933,三者联合预测价值更高(Z=4.112、3.893、4.035,P<0.001)。结论伴随SP患儿病情严重程度的增加,血清PBEF、IL-26水平升高,KLF2水平降低,三者可作为预测患儿预后转归的指标。
