目的探讨影响重度创伤性颅脑损伤患者接受去骨瓣减压治疗早期结果和出院状态的独立预测因子并建立变量logistic回归方程。方法通过医院计算机电子数据库收集并回顾性分析2016年1月至2020年1月收治的114例重度颅脑损伤患者的临床资料,使...目的探讨影响重度创伤性颅脑损伤患者接受去骨瓣减压治疗早期结果和出院状态的独立预测因子并建立变量logistic回归方程。方法通过医院计算机电子数据库收集并回顾性分析2016年1月至2020年1月收治的114例重度颅脑损伤患者的临床资料,使用单变量、多逻辑回归和预后回归评分方程绘制受试者工作特征曲线,预测颅脑外伤后的早期结果和出院状态。结果年龄≤50岁(P=0.034)、无既往病史(P=0.003)、双侧瞳孔直径<4 mm(P=0.001)、入院时格拉斯哥昏迷量表(Glasgow coma scale,GCS)评分>5分(P=0.004)和无气管切开(P=0.001)的接受去骨瓣减压治疗的重度创伤性颅脑损伤患者早期结果和出院状态较好;使用受试者工作特征曲线预测有利结果的概率,曲线下面积为79.0%,其中敏感度为66.7%,特异度为77.8%。结论年龄≤50岁、无既往病史、双侧瞳孔直径<4 mm、入院时GCS评分>5分和无气管切开可以作为评估接受去骨瓣减压治疗后重度创伤性颅脑损伤患者早期预后和出院状态的独立预测因子。展开更多
Coal pyrolysis is a fundamental reaction in the thermal processing and utilization of coal.Investigating the behavior and kinetics of coal pyrolysis is crucial for optimizing,designing,and developing a composite riser...Coal pyrolysis is a fundamental reaction in the thermal processing and utilization of coal.Investigating the behavior and kinetics of coal pyrolysis is crucial for optimizing,designing,and developing a composite riser for the staged pyrolysis gasification process of pulverized coal.In this study,the non-isothermal pyrolysis behavior and kinetics of coal were examined at different heating rates(30,50,100,300,500,700,and 900℃/min)using thermogravimetry(TG)coupled with Fourier-transform infrared spectroscopy.Analysis of the TG/derivative TG(TG/DTG)curves indicated that coal pyrolysis mainly occurred between 300℃ and 700℃.Higher heating rates led to more volatiles being released from the coal,and a higher temperature was required to achieve rapid pyrolysis.Kinetic analysis showed that both the model-free methods(Friedman,Flynn-Wall-Ozawa,and Kissinger-Akahira-Sunose)and the model-based method(Coats-Redfern)effectively describe the coal pyrolysis process.The change in the Ea values between the two kinetic models was consistent throughout the pyrolysis process,and the most probable mechanism was the F2 model(secondary chemical reaction).In addition,the heating rate did not change the overall reaction order of the pyrolysis process;however,a higher heating rate resulted in a decrease in the Ea value during the initial pyrolysis stage.展开更多
文摘目的探讨影响重度创伤性颅脑损伤患者接受去骨瓣减压治疗早期结果和出院状态的独立预测因子并建立变量logistic回归方程。方法通过医院计算机电子数据库收集并回顾性分析2016年1月至2020年1月收治的114例重度颅脑损伤患者的临床资料,使用单变量、多逻辑回归和预后回归评分方程绘制受试者工作特征曲线,预测颅脑外伤后的早期结果和出院状态。结果年龄≤50岁(P=0.034)、无既往病史(P=0.003)、双侧瞳孔直径<4 mm(P=0.001)、入院时格拉斯哥昏迷量表(Glasgow coma scale,GCS)评分>5分(P=0.004)和无气管切开(P=0.001)的接受去骨瓣减压治疗的重度创伤性颅脑损伤患者早期结果和出院状态较好;使用受试者工作特征曲线预测有利结果的概率,曲线下面积为79.0%,其中敏感度为66.7%,特异度为77.8%。结论年龄≤50岁、无既往病史、双侧瞳孔直径<4 mm、入院时GCS评分>5分和无气管切开可以作为评估接受去骨瓣减压治疗后重度创伤性颅脑损伤患者早期预后和出院状态的独立预测因子。
基金the financial support from the National Natural Science Foundation of China(Grant No.21576293 and 21576294)。
文摘Coal pyrolysis is a fundamental reaction in the thermal processing and utilization of coal.Investigating the behavior and kinetics of coal pyrolysis is crucial for optimizing,designing,and developing a composite riser for the staged pyrolysis gasification process of pulverized coal.In this study,the non-isothermal pyrolysis behavior and kinetics of coal were examined at different heating rates(30,50,100,300,500,700,and 900℃/min)using thermogravimetry(TG)coupled with Fourier-transform infrared spectroscopy.Analysis of the TG/derivative TG(TG/DTG)curves indicated that coal pyrolysis mainly occurred between 300℃ and 700℃.Higher heating rates led to more volatiles being released from the coal,and a higher temperature was required to achieve rapid pyrolysis.Kinetic analysis showed that both the model-free methods(Friedman,Flynn-Wall-Ozawa,and Kissinger-Akahira-Sunose)and the model-based method(Coats-Redfern)effectively describe the coal pyrolysis process.The change in the Ea values between the two kinetic models was consistent throughout the pyrolysis process,and the most probable mechanism was the F2 model(secondary chemical reaction).In addition,the heating rate did not change the overall reaction order of the pyrolysis process;however,a higher heating rate resulted in a decrease in the Ea value during the initial pyrolysis stage.
