The Jiuyishan granitic complex,located in the Nanling Range,South China,is composed of five granitic plutons(Xuehuading,Jinjiling,Pangxiemu,Shaziling and Xishan).Zircon U-Pb dating of four plutons(Jinjiling,Pangxiemu,...The Jiuyishan granitic complex,located in the Nanling Range,South China,is composed of five granitic plutons(Xuehuading,Jinjiling,Pangxiemu,Shaziling and Xishan).Zircon U-Pb dating of four plutons(Jinjiling,Pangxiemu,Shaziling and Xishan)yielded similar ages of approximately 153 Ma,indicating indistinguishable ages within error.Three plutons except the Shaziling pluton,have consistentε_(Nd)(t)(-7.8 to-5.8)andε_(Hf)(t)(-9.1 to-2.2)values,which are similar to those of the lower crustal granulitic metasedimentary and meta-igneous rocks in South China.Compared to other three plutons,the Shaziling pluton has consistentε_(Nd)(t)(-7.4 to-6.8)andε_(Hf)(t)(-7.5 to-4.7)values and shows similar source,but the Shaziling mafic microgranular enclaves(MMEs)show variableε_(Hf)(t)(-14.2 to 4.8)values,indicating a remarkable mantle magma injection of the Shaziling pluton.Zircon Ce/Sm-Yb/Gd,whole-rock CaO-P_(2)O_(5)and CaO-TiO_(2)linear trends reveal that from the Xishan to the Shaziling and from the Jinjiling to the Pangxiemu granites,they experienced apatite and titanite fractionation,respectively.Zircon Th,U,Nb,Ta,Hf,Ti,Y,P and rare earth element(REE)contents and whole-rock Sr,Ba and Rb contents also show that the Shaziling,Xishan,Jinjiling and Pangxiemu granites followed a discontinuous evolutionary series,but the Pangxiemu granites exhibit highly evolved nature.Four main controlling factors of W-Sn and rare metal mineralization in granitic rocks were discussed,and we found that the mineralization in Jiuyishan granitic complex was mainly controlled by the fractionation degree and crystallization temperature,but were rarely affected by oxygen fugacity and mantle material input.The Pangxiemu granites show particularly higher Rb and Ta contents than the other three plutons,implying that the ore deposits developed in the Jiuyishan Complex were directly related to the most evolved Pangxiemu pluton,with the occurrence of Rb and Ta as the most likely rare metal mineralization in the Jiuyishan District.A crystal mush model is proposed to interpret the petrogenetic and mineralizing processes of the Jiuyishan granitic complex.展开更多
采用直读光谱仪、金相显微镜和扫描电镜对用户提供的失效破碎锤活塞断口进行了成分测试及组织观察,分析活塞断裂原因,并按用户要求对活塞用SNCM616钢进行了成分与热处理工艺优化。结果表明,活塞断裂原因为表面渗碳层及附近区域粗晶、碳...采用直读光谱仪、金相显微镜和扫描电镜对用户提供的失效破碎锤活塞断口进行了成分测试及组织观察,分析活塞断裂原因,并按用户要求对活塞用SNCM616钢进行了成分与热处理工艺优化。结果表明,活塞断裂原因为表面渗碳层及附近区域粗晶、碳化物异常析出以及使用时发热烧蚀共同作用导致裂纹在渗碳层萌生,之后在交变应力作用下疲劳扩展直至断裂。在JIS G 4053:2016标准基础上,采用低P、低S及添加微量V元素的设计思路,制备了P、S含量仅0.005%、V含量0.12%的SNCM616钢。在原热处理工艺基础上,对热处理工艺进行了改进,即在渗碳后增加正火工序(860℃保温2 h,空冷),并在低温回火后增加深冷工序(-140℃深冷14 h)。经机加工及改进工艺热处理后,新开发SNCM616钢试制活塞的渗碳层及心部组织晶粒较细,不低于5级,渗碳层无异常碳化物析出,硬度满足用户要求。展开更多
目的 探讨C反应蛋白与白蛋白比值(C-reactive protein/albumin,CRP/ALB)、胰石蛋白(pancreatic stone protein,PSP)联合白细胞介素-12(interleukin-12,IL-12)预测重症肺炎患者脱机拔管结局的价值,以期指导临床决策,提高撤机成功率。方法...目的 探讨C反应蛋白与白蛋白比值(C-reactive protein/albumin,CRP/ALB)、胰石蛋白(pancreatic stone protein,PSP)联合白细胞介素-12(interleukin-12,IL-12)预测重症肺炎患者脱机拔管结局的价值,以期指导临床决策,提高撤机成功率。方法 选取2021年1月至2023年12月粤北人民医院收治的90例重症肺炎患者作为研究对象,根据脱机拔管结局分为失败组(n=26)和成功组(n=64),比较两组一般资料、入院当天及自主呼吸试验(spontaneous breathing trial,SBT)前血清CRP/ALB、PSP、IL-12水平,Pearson相关系数分析血清各指标与临床肺部感染评分(clinical pulmonary infection score,CPIS)、急性生理与慢性健康状况评分系统Ⅱ(acute physiology and chronic health evaluationⅡ,APACHEⅡ)的相关性,采用logistic回归方程分析血清CRP/ALB、PSP、IL-12对重症肺炎脱机拔管结局的影响,采用受试者工作特征曲线(receiver operating characteristic,ROC)及曲线下面积(area under the curve,AUC)分析血清各指标的预测效能。结果 (1)与成功组比较,失败组入院当天及SBT前CPIS、APACHEⅡ评分及血清CRP/ALB、PSP、IL-12水平较高(P<0.01)。(2)根据近因效应选择SBT前血清CRP/ALB、PSP、IL-12、CPIS及APACHEⅡ评分用于后续研究。重症肺炎脱机拔管失败患者SBT前CPIS、APACHEⅡ评分分别与血清CRP/ALB、PSP、IL-12水平呈正相关(P<0.05)。(3)校正后,SBT前CRP/ALB、PSP、IL-12仍与重症肺炎患者脱机拔管失败有关(P<0.05)。(4)SBT前CRP/ALB+PSP+IL-12联合预测重症肺炎患者脱机拔管失败效能[AUC(95%CI):0.936(0.864~0.977)]明显优于CRP/ALB、PSP和IL-12单一预测效能[0.822(0.727~0.895)、0.749(0.647~0.835)、0.827(0.733~0.899)]。结论 血清CRP/ALB、PSP、IL-12与重症肺炎患者脱机拔管失败密切相关,三者联合检测预测效能好,有助于指导临床诊治。展开更多
基金financially supported by the Provincial Natural Science Foundation of Hunan(Nos.2019JJ50831,2023JJ30505 and 2023JJ40541)the China Postdoctoral Science Foundation(Nos.2017M622597 and 2021M690591)+2 种基金the Open Research Fund Program of Fundamental Science on Radioactive Geology and Exploration Technology Laboratory(East China University of Technology)(No.2022RGET04)the National Foreign Expert Project(No.G2022029012L)the National Nature Science Foundation of China(No.41002022)。
文摘The Jiuyishan granitic complex,located in the Nanling Range,South China,is composed of five granitic plutons(Xuehuading,Jinjiling,Pangxiemu,Shaziling and Xishan).Zircon U-Pb dating of four plutons(Jinjiling,Pangxiemu,Shaziling and Xishan)yielded similar ages of approximately 153 Ma,indicating indistinguishable ages within error.Three plutons except the Shaziling pluton,have consistentε_(Nd)(t)(-7.8 to-5.8)andε_(Hf)(t)(-9.1 to-2.2)values,which are similar to those of the lower crustal granulitic metasedimentary and meta-igneous rocks in South China.Compared to other three plutons,the Shaziling pluton has consistentε_(Nd)(t)(-7.4 to-6.8)andε_(Hf)(t)(-7.5 to-4.7)values and shows similar source,but the Shaziling mafic microgranular enclaves(MMEs)show variableε_(Hf)(t)(-14.2 to 4.8)values,indicating a remarkable mantle magma injection of the Shaziling pluton.Zircon Ce/Sm-Yb/Gd,whole-rock CaO-P_(2)O_(5)and CaO-TiO_(2)linear trends reveal that from the Xishan to the Shaziling and from the Jinjiling to the Pangxiemu granites,they experienced apatite and titanite fractionation,respectively.Zircon Th,U,Nb,Ta,Hf,Ti,Y,P and rare earth element(REE)contents and whole-rock Sr,Ba and Rb contents also show that the Shaziling,Xishan,Jinjiling and Pangxiemu granites followed a discontinuous evolutionary series,but the Pangxiemu granites exhibit highly evolved nature.Four main controlling factors of W-Sn and rare metal mineralization in granitic rocks were discussed,and we found that the mineralization in Jiuyishan granitic complex was mainly controlled by the fractionation degree and crystallization temperature,but were rarely affected by oxygen fugacity and mantle material input.The Pangxiemu granites show particularly higher Rb and Ta contents than the other three plutons,implying that the ore deposits developed in the Jiuyishan Complex were directly related to the most evolved Pangxiemu pluton,with the occurrence of Rb and Ta as the most likely rare metal mineralization in the Jiuyishan District.A crystal mush model is proposed to interpret the petrogenetic and mineralizing processes of the Jiuyishan granitic complex.
文摘采用直读光谱仪、金相显微镜和扫描电镜对用户提供的失效破碎锤活塞断口进行了成分测试及组织观察,分析活塞断裂原因,并按用户要求对活塞用SNCM616钢进行了成分与热处理工艺优化。结果表明,活塞断裂原因为表面渗碳层及附近区域粗晶、碳化物异常析出以及使用时发热烧蚀共同作用导致裂纹在渗碳层萌生,之后在交变应力作用下疲劳扩展直至断裂。在JIS G 4053:2016标准基础上,采用低P、低S及添加微量V元素的设计思路,制备了P、S含量仅0.005%、V含量0.12%的SNCM616钢。在原热处理工艺基础上,对热处理工艺进行了改进,即在渗碳后增加正火工序(860℃保温2 h,空冷),并在低温回火后增加深冷工序(-140℃深冷14 h)。经机加工及改进工艺热处理后,新开发SNCM616钢试制活塞的渗碳层及心部组织晶粒较细,不低于5级,渗碳层无异常碳化物析出,硬度满足用户要求。
文摘目的 探讨C反应蛋白与白蛋白比值(C-reactive protein/albumin,CRP/ALB)、胰石蛋白(pancreatic stone protein,PSP)联合白细胞介素-12(interleukin-12,IL-12)预测重症肺炎患者脱机拔管结局的价值,以期指导临床决策,提高撤机成功率。方法 选取2021年1月至2023年12月粤北人民医院收治的90例重症肺炎患者作为研究对象,根据脱机拔管结局分为失败组(n=26)和成功组(n=64),比较两组一般资料、入院当天及自主呼吸试验(spontaneous breathing trial,SBT)前血清CRP/ALB、PSP、IL-12水平,Pearson相关系数分析血清各指标与临床肺部感染评分(clinical pulmonary infection score,CPIS)、急性生理与慢性健康状况评分系统Ⅱ(acute physiology and chronic health evaluationⅡ,APACHEⅡ)的相关性,采用logistic回归方程分析血清CRP/ALB、PSP、IL-12对重症肺炎脱机拔管结局的影响,采用受试者工作特征曲线(receiver operating characteristic,ROC)及曲线下面积(area under the curve,AUC)分析血清各指标的预测效能。结果 (1)与成功组比较,失败组入院当天及SBT前CPIS、APACHEⅡ评分及血清CRP/ALB、PSP、IL-12水平较高(P<0.01)。(2)根据近因效应选择SBT前血清CRP/ALB、PSP、IL-12、CPIS及APACHEⅡ评分用于后续研究。重症肺炎脱机拔管失败患者SBT前CPIS、APACHEⅡ评分分别与血清CRP/ALB、PSP、IL-12水平呈正相关(P<0.05)。(3)校正后,SBT前CRP/ALB、PSP、IL-12仍与重症肺炎患者脱机拔管失败有关(P<0.05)。(4)SBT前CRP/ALB+PSP+IL-12联合预测重症肺炎患者脱机拔管失败效能[AUC(95%CI):0.936(0.864~0.977)]明显优于CRP/ALB、PSP和IL-12单一预测效能[0.822(0.727~0.895)、0.749(0.647~0.835)、0.827(0.733~0.899)]。结论 血清CRP/ALB、PSP、IL-12与重症肺炎患者脱机拔管失败密切相关,三者联合检测预测效能好,有助于指导临床诊治。
