The one-dimensional photonic crystals of Ag/SiO_(2) system are studied to investigate the photonic band gaps (PBG). The samples were prepared by the ultra-high vacuum electron beam evaporation. The clear band gaps wer...The one-dimensional photonic crystals of Ag/SiO_(2) system are studied to investigate the photonic band gaps (PBG). The samples were prepared by the ultra-high vacuum electron beam evaporation. The clear band gaps were observed. Satisfactory agreement between experimental and calculated results was obtained without fitting. The thickness of SiO_(2 )film has influence on the photonic band gap, as well as it awfully affects the transmittance of Ag. More layers can get clearer PBG.展开更多
目的:本研究旨在评估白蛋白校正阴离子间隙(albumin-corrected anion gap,ACAG)与急性胰腺炎(acute pancreatitis,AP)患者短期至长期死亡结局之间的关联。方法:这项回顾性研究基于美国重症监护医学信息数据库(Medical Information Mart ...目的:本研究旨在评估白蛋白校正阴离子间隙(albumin-corrected anion gap,ACAG)与急性胰腺炎(acute pancreatitis,AP)患者短期至长期死亡结局之间的关联。方法:这项回顾性研究基于美国重症监护医学信息数据库(Medical Information Mart for Intensive Care,MIMIC)-Ⅳ,将诊断为AP并入住重症监护病房的成人患者纳入了研究,通过COX回归风险分析、受试者工作特征(receiver operating characteristic,ROC)曲线分析、卡普兰-迈耶(Kaplan-Meier,K-M)生存曲线分析、限制性立方样条以及亚组分析判断ACAG对AP患者死亡结局的预测能力。结果:本研究共入组444例患者,根据入院后28 d的患者死亡情况将患者分为存活组(412例)及死亡组(32例),入院后28 d死亡率为7.2%。多因素COX回归显示ACAG是AP患者入院28 d全因死亡率的独立预测因子(HR=1.18;95%CI=1.05~1.32),而在90 d(HR=1.05,95%CI=0.97~1.14),180 d(HR=1.01,95%CI=0.94~1.09)和1年(HR=1.02,95%CI=0.95~1.10)的预后判断能力上,ACAG并不能作为AP患者死亡结局的独立预测因子。ROC曲线分析显示ACAG预测28 d死亡结局的曲线下面积(area under the curve,AUC)为0.732(95%CI=0.632~0.832),优于AG[AUC=0.665(95%CI=0.550~0.781)]和血清白蛋白(serum albumin,ALB)[AUC=0.655(95%CI=0.550~0.761)],与序贯器官衰竭评分(sequential organ failure score,SOFA)相近[AUC=0.745(95%CI=0.651~0.838)]。根据ROC曲线得出ACAG的最佳界值为21.375。将ACAG以21.375分为高值组与常值组,K-M分析显示ACAG高值患者死亡率高于ACAG常值患者(P<0.001)。亚组分析显示结果稳定。结论:ACAG可作为AP患者入院后28 d全因死亡率的独立预测因子,其检验效能优于AG及ALB,与SOFA相近,但与AP患者90 d、180 d,1年死亡结局的相关性并不具有显著性。展开更多
We present here the first observation of cathodoluminescence (CL) images of Met.(Cu, Ag)-TCNQ anion radical salts organic thin films which were prepared in sat urated TCNQ/CH3CN liquid-phase by self-growth. The erperi...We present here the first observation of cathodoluminescence (CL) images of Met.(Cu, Ag)-TCNQ anion radical salts organic thin films which were prepared in sat urated TCNQ/CH3CN liquid-phase by self-growth. The erperiments were carried out by means of Hitachi S-450 type scanning electron microscopy(SEM). Comparsion of CL images with secondary electron(SE) images of the same point on the organic thin film indicates that the shape of Met.(Cu, Ag)-TCNQ in CL images corresponds very well to that in the SE images. The results observed also shows that the CL intensity of CuTCNQ is stronger than that of AgTCNQ under the same experimental conditions. Based on the above results, a brief discussion about the preliminary mechanism of CL from Met.(Cu,Ag)-TCNQ has been given.展开更多
基金Supported by the National High Technology Development Program of China(Grant No.2003AA32720)Shanghai Nanotechnology Promotion Center(0352nm016, 0359nm204,0252nm084)+2 种基金Science and Technology Council of Shanghai(03dz11009)Fore-research of basic research project(2001CCA02800)the special Foundation for State Major Basic Research Programmeof China(Grant No.001CB610408)
文摘The one-dimensional photonic crystals of Ag/SiO_(2) system are studied to investigate the photonic band gaps (PBG). The samples were prepared by the ultra-high vacuum electron beam evaporation. The clear band gaps were observed. Satisfactory agreement between experimental and calculated results was obtained without fitting. The thickness of SiO_(2 )film has influence on the photonic band gap, as well as it awfully affects the transmittance of Ag. More layers can get clearer PBG.
文摘目的:本研究旨在评估白蛋白校正阴离子间隙(albumin-corrected anion gap,ACAG)与急性胰腺炎(acute pancreatitis,AP)患者短期至长期死亡结局之间的关联。方法:这项回顾性研究基于美国重症监护医学信息数据库(Medical Information Mart for Intensive Care,MIMIC)-Ⅳ,将诊断为AP并入住重症监护病房的成人患者纳入了研究,通过COX回归风险分析、受试者工作特征(receiver operating characteristic,ROC)曲线分析、卡普兰-迈耶(Kaplan-Meier,K-M)生存曲线分析、限制性立方样条以及亚组分析判断ACAG对AP患者死亡结局的预测能力。结果:本研究共入组444例患者,根据入院后28 d的患者死亡情况将患者分为存活组(412例)及死亡组(32例),入院后28 d死亡率为7.2%。多因素COX回归显示ACAG是AP患者入院28 d全因死亡率的独立预测因子(HR=1.18;95%CI=1.05~1.32),而在90 d(HR=1.05,95%CI=0.97~1.14),180 d(HR=1.01,95%CI=0.94~1.09)和1年(HR=1.02,95%CI=0.95~1.10)的预后判断能力上,ACAG并不能作为AP患者死亡结局的独立预测因子。ROC曲线分析显示ACAG预测28 d死亡结局的曲线下面积(area under the curve,AUC)为0.732(95%CI=0.632~0.832),优于AG[AUC=0.665(95%CI=0.550~0.781)]和血清白蛋白(serum albumin,ALB)[AUC=0.655(95%CI=0.550~0.761)],与序贯器官衰竭评分(sequential organ failure score,SOFA)相近[AUC=0.745(95%CI=0.651~0.838)]。根据ROC曲线得出ACAG的最佳界值为21.375。将ACAG以21.375分为高值组与常值组,K-M分析显示ACAG高值患者死亡率高于ACAG常值患者(P<0.001)。亚组分析显示结果稳定。结论:ACAG可作为AP患者入院后28 d全因死亡率的独立预测因子,其检验效能优于AG及ALB,与SOFA相近,但与AP患者90 d、180 d,1年死亡结局的相关性并不具有显著性。
文摘We present here the first observation of cathodoluminescence (CL) images of Met.(Cu, Ag)-TCNQ anion radical salts organic thin films which were prepared in sat urated TCNQ/CH3CN liquid-phase by self-growth. The erperiments were carried out by means of Hitachi S-450 type scanning electron microscopy(SEM). Comparsion of CL images with secondary electron(SE) images of the same point on the organic thin film indicates that the shape of Met.(Cu, Ag)-TCNQ in CL images corresponds very well to that in the SE images. The results observed also shows that the CL intensity of CuTCNQ is stronger than that of AgTCNQ under the same experimental conditions. Based on the above results, a brief discussion about the preliminary mechanism of CL from Met.(Cu,Ag)-TCNQ has been given.
