目的探寻年龄校正反向休克指数(reverse shock index,rSI)和格拉斯哥昏迷(Glasgow Coma Scale,GCS)评分的乘积,即rSIG指数,预测急诊一二级创伤患者预后的价值。方法回顾性分析我院2020年1月至2020年12月所有急诊一二级创伤患者的基本数...目的探寻年龄校正反向休克指数(reverse shock index,rSI)和格拉斯哥昏迷(Glasgow Coma Scale,GCS)评分的乘积,即rSIG指数,预测急诊一二级创伤患者预后的价值。方法回顾性分析我院2020年1月至2020年12月所有急诊一二级创伤患者的基本数据,共538例,其中男400例,女138例。根据住院期间是否死亡,分为存活组和死亡组,对比两组患者性别、年龄、收缩压(SBP)、心率(HR)、休克指数(shock index,SI)、rSI、GCS评分、SIA(SI×年龄)、SIG(SI×GCS评分)、rSIG和rSIG/A(rSIG/年龄)等临床指标,分析它们与患者预后的关系。结果两独立样本非参数检验(曼-惠特尼U检验)分析得出年龄、GCS评分、SIG、rSIG、rSIG/A对住院病死率有显著预测价值,用受试者工作特征曲线(ROC)下的面积(AUC)表明其预测敏感度及特异度。GCS的AUC为0.861(0.829~0.890),敏感度为74.68%,特异度为88.45%,预测价值最优;rSIG/A的AUC为0.842(0.809~0.872),敏感度为70.89%,特异度为90.41%,且与年龄的预测价值差异有统计学意义。<55岁组中,rSIG/A的AUC为0.859(0.813~0.897),敏感度为76.47%,特异度为88.21%;≥55岁组中,rSIG/A的AUC为0.817(0.764~0.862),敏感度为71.11%,特异度为86.36%。其中≥55岁组rSIG/A的诊断标准为≤0.196,<55岁组的rSIG/A诊断标准为≤0.300,需要更加关注高龄患者的SBP情况。结论对急诊一二级创伤患者来讲,rSIG/A是一个很强的预测住院死亡的指标,且在急诊分诊时容易计算。展开更多
The cyclodextrin (CD) derivatives with ethilenic bonds mono-(2-O-tosyl)-6-acryloyl-β-cyclodextrin (β-CD-2-OTs-6-A) and 6-acryloyl-β-cyclodextrin (β-CD-6-A) were respectively synthesized. β-CD-2-OTs-6-A was prepar...The cyclodextrin (CD) derivatives with ethilenic bonds mono-(2-O-tosyl)-6-acryloyl-β-cyclodextrin (β-CD-2-OTs-6-A) and 6-acryloyl-β-cyclodextrin (β-CD-6-A) were respectively synthesized. β-CD-2-OTs-6-A was prepared by the reaction propylene chloride with β-CD-2-OTs. β-CD-6-A was synthesized by the reaction propylene chloride with β-CD. The most suitable pH value for β-CD-6-A grafted onto silk fabric was proved to be 5. The optimal condition for grafting β-CD-2-OTs-6-A onto silk was proved: monomer concentration of 20% on weight of fabric(o.w.f), potassium persulfate of 1.85% o.w.f, liquor ratio of 1∶50, pH=5, and treated 30 min at 80 ℃. Compared with β-CD-6-A, the grafting reaction has a higher graft yield while β-CD-2-OTs-6-A acts as the monomer.展开更多
由于长距离光传输系统中常使用的线性复用技术,常将非线性视为一种干扰因素。非线性频分复用(Nonlinear Frequency Division Multiplexing,NFDM)近年来受到广泛关注,这种技术在非线性傅立叶域中对数据进行调制,被视为克服克尔非线性的...由于长距离光传输系统中常使用的线性复用技术,常将非线性视为一种干扰因素。非线性频分复用(Nonlinear Frequency Division Multiplexing,NFDM)近年来受到广泛关注,这种技术在非线性傅立叶域中对数据进行调制,被视为克服克尔非线性的一种潜在方法。本文详细介绍了相干光NFDM的理论推导和传输过程,并描述了b系数调制的概念和优化设计。在本文中,使用训练序列来实现基于b系数调制的NFDM系统的信道估计,并通过蒙特卡洛仿真进行验证。基于改进后的b系数调制方法相比于传统b系数调制方法具有更低的误码率并且可以传输更远的距离。此外,它的性能明显优于传统的调制反射系数的方法。展开更多
基金Research Topics of Shanghai Scientific Committee,China(No.09495802300)
文摘The cyclodextrin (CD) derivatives with ethilenic bonds mono-(2-O-tosyl)-6-acryloyl-β-cyclodextrin (β-CD-2-OTs-6-A) and 6-acryloyl-β-cyclodextrin (β-CD-6-A) were respectively synthesized. β-CD-2-OTs-6-A was prepared by the reaction propylene chloride with β-CD-2-OTs. β-CD-6-A was synthesized by the reaction propylene chloride with β-CD. The most suitable pH value for β-CD-6-A grafted onto silk fabric was proved to be 5. The optimal condition for grafting β-CD-2-OTs-6-A onto silk was proved: monomer concentration of 20% on weight of fabric(o.w.f), potassium persulfate of 1.85% o.w.f, liquor ratio of 1∶50, pH=5, and treated 30 min at 80 ℃. Compared with β-CD-6-A, the grafting reaction has a higher graft yield while β-CD-2-OTs-6-A acts as the monomer.
文摘由于长距离光传输系统中常使用的线性复用技术,常将非线性视为一种干扰因素。非线性频分复用(Nonlinear Frequency Division Multiplexing,NFDM)近年来受到广泛关注,这种技术在非线性傅立叶域中对数据进行调制,被视为克服克尔非线性的一种潜在方法。本文详细介绍了相干光NFDM的理论推导和传输过程,并描述了b系数调制的概念和优化设计。在本文中,使用训练序列来实现基于b系数调制的NFDM系统的信道估计,并通过蒙特卡洛仿真进行验证。基于改进后的b系数调制方法相比于传统b系数调制方法具有更低的误码率并且可以传输更远的距离。此外,它的性能明显优于传统的调制反射系数的方法。