目的分析失代偿期乙型肝炎肝硬化患者血清HBV-DNA水平与乙型肝炎病毒标志物、生化及凝血等指标的相关性。方法回顾性分析2018年1月至2020年12月我院收治的645例失代偿期乙型肝炎肝硬化患者的临床资料,根据HBV-DNA水平分为4组:阴性组、...目的分析失代偿期乙型肝炎肝硬化患者血清HBV-DNA水平与乙型肝炎病毒标志物、生化及凝血等指标的相关性。方法回顾性分析2018年1月至2020年12月我院收治的645例失代偿期乙型肝炎肝硬化患者的临床资料,根据HBV-DNA水平分为4组:阴性组、低病毒载量组(<2.0×10^(3)IU/mL)、中病毒载量组(2.0×10^(3)~2.0×10^(5)IU/mL)和高病毒载量组(>105IU/mL),测定所有患者乙型肝炎病毒血清学标志物(HBV-M)、肝功能相关生化指标(ALT、AST、TBIL、DBIL、ALB)、凝血相关指标(PT、INR、APTT、TT、D-D、PLT),比较4组患者各项指标的差异,并分析各项指标与HBV-DNA水平的相关性。结果在失代偿期乙型肝炎肝硬化患者中,HBsAg和HBeAg的定量数值随着HBV-DNA水平的升高而增高,HBsAg的明显升高主要体现在HBV-DNA阴性组和低病毒载量组之间(779.40 vs 5773.00IU/mL),而HBeAg的表达在中病毒载量组(0.19 COI)和高病毒载量组(7.96 COI)中才出现显著升高,低病毒载量组的HBeAg阳性表达率较低。随着病毒载量的升高,患者的ALT、AST、TBIL、DBIL、D/T、AFP指标均有所升高,而ALB的水平降低;除TT存在显著性差异外,PT、APTT、INR、Fib、D-D、PLT这6个指标差异均无统计学意义。经Pearson相关性分析检验,失代偿期乙型肝炎肝硬化患者血清HBV-DNA水平与ALT、AST、TBIL、DBIL、AFP、PT、APTT、TT、D-D、HBsAg、HBeAg水平呈正相关(r>0,P均<0.05),与ALB、Fib水平呈负相关(r<0,P均<0.05),与PLT、HBeAb水平不存在相关性。结论在失代偿期乙型肝炎肝硬化患者中,血清HBV-DNA载量与HBsAg、HBeAg表达水平密切相关,与ALT、AST、TBIL、DBIL、D/T、ALB等肝功能相关生化指标相关,与凝血相关指标存在关联,但在不同HBV-DNA载量组中无差异。HBV-DNA载量可作为HBeAg阴性患者肝脏损害程度的有效预测指标。展开更多
Al7075-Cu composite joints were prepared by the squeeze overcast process.The effects of melt temperature,die temperature,and squeeze pressure on hardness and ultimate tensile strength(UTS)of squeeze overcast Al7075-Cu...Al7075-Cu composite joints were prepared by the squeeze overcast process.The effects of melt temperature,die temperature,and squeeze pressure on hardness and ultimate tensile strength(UTS)of squeeze overcast Al7075-Cu composite joints were studied.The experimental results depict that squeeze pressure is the most significant process parameter affecting the hardness and UTS.The optimal values of UTS(48 MPa)and hardness(76 HRB)are achieved at a melt temperature of 800℃,a die temperature of 250℃,and a squeeze pressure of 90 MPa.Scanning electron microscopy(SEM)shows that fractured surfaces show flatfaced morphology at the optimal experimental condition.Energy-dispersive spectroscopy(EDS)analysis depicts that the atomic weight percentage of Zn decreases with an increase in melt temperature and squeeze pressure.The optimal mechanical properties of the Al7075-Cu overcast joint were achieved at the Al2Cu eutectic phase due to the large number of copper atoms that dispersed into the aluminum melt during the solidification process and the formation of strong intermetallic bonds.Gray relational analysis integrated with the Taguchi method was used to develop an optimal set of control variables for multi-response parametric optimization.Confirmatory tests were performed to validate the effectiveness of the employed technique.The manufacturing of squeeze overcast Al7075-Cu composite joints at optimal process parameters delivers a great indication to acknowledge a new method for foundry practitioners to manufacture materials with superior mechanical properties.展开更多
文摘目的分析失代偿期乙型肝炎肝硬化患者血清HBV-DNA水平与乙型肝炎病毒标志物、生化及凝血等指标的相关性。方法回顾性分析2018年1月至2020年12月我院收治的645例失代偿期乙型肝炎肝硬化患者的临床资料,根据HBV-DNA水平分为4组:阴性组、低病毒载量组(<2.0×10^(3)IU/mL)、中病毒载量组(2.0×10^(3)~2.0×10^(5)IU/mL)和高病毒载量组(>105IU/mL),测定所有患者乙型肝炎病毒血清学标志物(HBV-M)、肝功能相关生化指标(ALT、AST、TBIL、DBIL、ALB)、凝血相关指标(PT、INR、APTT、TT、D-D、PLT),比较4组患者各项指标的差异,并分析各项指标与HBV-DNA水平的相关性。结果在失代偿期乙型肝炎肝硬化患者中,HBsAg和HBeAg的定量数值随着HBV-DNA水平的升高而增高,HBsAg的明显升高主要体现在HBV-DNA阴性组和低病毒载量组之间(779.40 vs 5773.00IU/mL),而HBeAg的表达在中病毒载量组(0.19 COI)和高病毒载量组(7.96 COI)中才出现显著升高,低病毒载量组的HBeAg阳性表达率较低。随着病毒载量的升高,患者的ALT、AST、TBIL、DBIL、D/T、AFP指标均有所升高,而ALB的水平降低;除TT存在显著性差异外,PT、APTT、INR、Fib、D-D、PLT这6个指标差异均无统计学意义。经Pearson相关性分析检验,失代偿期乙型肝炎肝硬化患者血清HBV-DNA水平与ALT、AST、TBIL、DBIL、AFP、PT、APTT、TT、D-D、HBsAg、HBeAg水平呈正相关(r>0,P均<0.05),与ALB、Fib水平呈负相关(r<0,P均<0.05),与PLT、HBeAb水平不存在相关性。结论在失代偿期乙型肝炎肝硬化患者中,血清HBV-DNA载量与HBsAg、HBeAg表达水平密切相关,与ALT、AST、TBIL、DBIL、D/T、ALB等肝功能相关生化指标相关,与凝血相关指标存在关联,但在不同HBV-DNA载量组中无差异。HBV-DNA载量可作为HBeAg阴性患者肝脏损害程度的有效预测指标。
文摘Al7075-Cu composite joints were prepared by the squeeze overcast process.The effects of melt temperature,die temperature,and squeeze pressure on hardness and ultimate tensile strength(UTS)of squeeze overcast Al7075-Cu composite joints were studied.The experimental results depict that squeeze pressure is the most significant process parameter affecting the hardness and UTS.The optimal values of UTS(48 MPa)and hardness(76 HRB)are achieved at a melt temperature of 800℃,a die temperature of 250℃,and a squeeze pressure of 90 MPa.Scanning electron microscopy(SEM)shows that fractured surfaces show flatfaced morphology at the optimal experimental condition.Energy-dispersive spectroscopy(EDS)analysis depicts that the atomic weight percentage of Zn decreases with an increase in melt temperature and squeeze pressure.The optimal mechanical properties of the Al7075-Cu overcast joint were achieved at the Al2Cu eutectic phase due to the large number of copper atoms that dispersed into the aluminum melt during the solidification process and the formation of strong intermetallic bonds.Gray relational analysis integrated with the Taguchi method was used to develop an optimal set of control variables for multi-response parametric optimization.Confirmatory tests were performed to validate the effectiveness of the employed technique.The manufacturing of squeeze overcast Al7075-Cu composite joints at optimal process parameters delivers a great indication to acknowledge a new method for foundry practitioners to manufacture materials with superior mechanical properties.
