In order to study the anti-fatigue performance of RCA modified asphalt (RMA),the performance of RMA and 90#matrix asphalt with different modifier content were measured by asphalt penetration,ductility,softening point,...In order to study the anti-fatigue performance of RCA modified asphalt (RMA),the performance of RMA and 90#matrix asphalt with different modifier content were measured by asphalt penetration,ductility,softening point,Brookfield viscosity,rheological index,infrared spectrum and dielectric constant test.This paper discusses the changes of asphalt basic indexes,fatigue properties and asphalt components based on dielectric properties under different modifier contents,and analyzes the grey correlation degree between components and asphalt pavement performance indexes.The results show that the optimum content of RCA modifier is 16.7%of the asphalt quality according to the penetration,ductility,softening point,Brockfield viscosity,viscosity temperature curve and fatigue life.In the phase angle-strain curve,there is disorder in the latter part of the curve.According to the strain (ε_(d)) corresponding to the disorder point,a new fatigue failure criterion is proposed and proved.Based on the new asphalt fatigue failure criterion,the fatigue prediction model of asphalt mixture is improved,and the fatigue life predicted by the improved fatigue model is compared with the fatigue life obtained by four-point bending fatigue test.The results show that the proposed new asphalt fatigue failure criterion is reasonable,and the fatigue life predicted by the improved asphalt mixture fatigue prediction model is accurate.The research method of classifying asphalt components based on dielectric properties is simple and effective,and the components have a high correlation with the road performance of base asphalt and modified asphalt.展开更多
目的探讨基层医院通过智能手机微信院前激活导管室对急性ST段抬高型心肌梗死(ST-segment elevation myocardial infarction,STEMI)病人再灌注时间的影响。方法通过智能手机微信群,潞河医院与120急救中心及周边20余家非急诊经皮冠状动脉...目的探讨基层医院通过智能手机微信院前激活导管室对急性ST段抬高型心肌梗死(ST-segment elevation myocardial infarction,STEMI)病人再灌注时间的影响。方法通过智能手机微信群,潞河医院与120急救中心及周边20余家非急诊经皮冠状动脉介入(percutaneous coronary intervention,PCI)基层医院建立STEMI病人区域协同救治系统。将2015年7月至2016年7月微信群建立后基层医院转诊的STEMI病人分为2组:导管室组(n=48)通过微信群激活、急救服务系统(Emergency Medical System,EMS)120将病人直接送入导管室。对照组(n=52),通过微信群激活、EMS将病人送至急诊后再送导管室。比较2组病人首次医疗接触至器械(first medical contact-to-device,FMC2D)时间、FMC2D时间指南达标率和门器械(door to device,D2D)时间。结果 2组病人的基线临床资料和冠状动脉造影资料差异均无统计学意义(P均>0.05)。与对照组相比,导管室组的FMC2D中位数时间明显缩短(98.0 min vs 151.4 min,P<0.001),FMC2D时间指南达标率明显提高(60.4%vs 25.0%,P<0.001),D2D中位数时间明显缩短(21.7 min vs 54.0 min,P<0.001)。住院期间2组各死亡2例(4.17%vs 3.85%,P>0.05)。结论基层医院通过微信激活导管室将STEMI病人直接转运至导管室可明显缩短FMC2D和D2D时间,提高FMC2D达标率。展开更多
基金Funded by Natural Science Foundation of Inner Mongolia,China (No. 2019MS05033)。
文摘In order to study the anti-fatigue performance of RCA modified asphalt (RMA),the performance of RMA and 90#matrix asphalt with different modifier content were measured by asphalt penetration,ductility,softening point,Brookfield viscosity,rheological index,infrared spectrum and dielectric constant test.This paper discusses the changes of asphalt basic indexes,fatigue properties and asphalt components based on dielectric properties under different modifier contents,and analyzes the grey correlation degree between components and asphalt pavement performance indexes.The results show that the optimum content of RCA modifier is 16.7%of the asphalt quality according to the penetration,ductility,softening point,Brockfield viscosity,viscosity temperature curve and fatigue life.In the phase angle-strain curve,there is disorder in the latter part of the curve.According to the strain (ε_(d)) corresponding to the disorder point,a new fatigue failure criterion is proposed and proved.Based on the new asphalt fatigue failure criterion,the fatigue prediction model of asphalt mixture is improved,and the fatigue life predicted by the improved fatigue model is compared with the fatigue life obtained by four-point bending fatigue test.The results show that the proposed new asphalt fatigue failure criterion is reasonable,and the fatigue life predicted by the improved asphalt mixture fatigue prediction model is accurate.The research method of classifying asphalt components based on dielectric properties is simple and effective,and the components have a high correlation with the road performance of base asphalt and modified asphalt.
文摘目的探讨基层医院通过智能手机微信院前激活导管室对急性ST段抬高型心肌梗死(ST-segment elevation myocardial infarction,STEMI)病人再灌注时间的影响。方法通过智能手机微信群,潞河医院与120急救中心及周边20余家非急诊经皮冠状动脉介入(percutaneous coronary intervention,PCI)基层医院建立STEMI病人区域协同救治系统。将2015年7月至2016年7月微信群建立后基层医院转诊的STEMI病人分为2组:导管室组(n=48)通过微信群激活、急救服务系统(Emergency Medical System,EMS)120将病人直接送入导管室。对照组(n=52),通过微信群激活、EMS将病人送至急诊后再送导管室。比较2组病人首次医疗接触至器械(first medical contact-to-device,FMC2D)时间、FMC2D时间指南达标率和门器械(door to device,D2D)时间。结果 2组病人的基线临床资料和冠状动脉造影资料差异均无统计学意义(P均>0.05)。与对照组相比,导管室组的FMC2D中位数时间明显缩短(98.0 min vs 151.4 min,P<0.001),FMC2D时间指南达标率明显提高(60.4%vs 25.0%,P<0.001),D2D中位数时间明显缩短(21.7 min vs 54.0 min,P<0.001)。住院期间2组各死亡2例(4.17%vs 3.85%,P>0.05)。结论基层医院通过微信激活导管室将STEMI病人直接转运至导管室可明显缩短FMC2D和D2D时间,提高FMC2D达标率。
