The intrusion of obstacles onto railway tracks presents a significant threat to train safety,characterized by sudden and unpredictable occurrences.With China leading the world in high-speed rail mileage,ensuring railw...The intrusion of obstacles onto railway tracks presents a significant threat to train safety,characterized by sudden and unpredictable occurrences.With China leading the world in high-speed rail mileage,ensuring railway security is paramount.The current laser monitoring technologies suffer from high false alarm rates and unreliable intrusion identification.This study addresses these issues by investigating high-resolution laser monitoring technology for railway obstacles,focusing on key parameters such as monitoring range and resolution.We propose an enhanced non-uniform laser scanning method,developing a laser monitoring system that reduces the obstacle false alarm rate to 2.00%,significantly lower than the 20%standard(TJ/GW135-2015).This rate is the best record for laser monitoring systems on China Railway.Our system operates seamlessly in all weather conditions,providing superior accuracy,resolution,and identification efficiency.It is the only 3D LiDAR system certified by the China State Railway Group Co.,Ltd.(Certificate No.[2023]008).Over three years,our system has been deployed at numerous points along various lines managed by the China State Railway Group,accumulating a dataset of 300,000 observations.This extensive deployment has significantly enhanced railway safety.The development and implementation of our railway laser monitoring system represent a substantial advancement in railway safety technology.Its low false alarm rate(2.00%),high accuracy(20 cm×20 cm×20 cm),and robust performance in diverse conditions underscore its potential for widespread adoption,promising to enhance railway safety in China and internationally.展开更多
Several primary factors influencing the alpha energy spectrum of 241Am fire alarm source have been studied in order to get better alpha energy spectrum. The results show that the homogeneity and the thickness of metal...Several primary factors influencing the alpha energy spectrum of 241Am fire alarm source have been studied in order to get better alpha energy spectrum. The results show that the homogeneity and the thickness of metal surface coat and the size of active area of the source have considerable influence on the alpha energy spectrum of the source.展开更多
The safety performance of 241Am fire alarm sources made by using powder metallurgical technology has been preliminarily studied, so as to determine an allowable maximum energy limit value of the alpha particles outgoi...The safety performance of 241Am fire alarm sources made by using powder metallurgical technology has been preliminarily studied, so as to determine an allowable maximum energy limit value of the alpha particles outgoing from this kind of sources in light of radiation safety and the present technology. The yielded results show that 241Am leak has not been found when the peak energy of the alpha energy spectrum of this kind of sources is less than 4.96 MeV.展开更多
目的开发急诊信息系统的心电监护报警参数自动计算与预警模块,并探讨其在急诊危重患者安全管理中的应用效果。方法成立危重患者心电监护报警参数设置的改进团队,设计研发急诊信息系统心电监护报警范围自动计算模块与预警模块。选取2023...目的开发急诊信息系统的心电监护报警参数自动计算与预警模块,并探讨其在急诊危重患者安全管理中的应用效果。方法成立危重患者心电监护报警参数设置的改进团队,设计研发急诊信息系统心电监护报警范围自动计算模块与预警模块。选取2023年3—12月浙江省某三甲医院急诊抢救室使用心电监护的危重患者作为研究对象,将报警范围自动计算与预警模块应用前后分为对照组(2023年3—5月)和观察组(2023年10—12月),比较2组患者心电监护报警参数设置正确率、报警设置错误同时期患者基本情况,观察实践效果。结果应用心电监护仪报警参数设置与预警模块后,心电监护报警参数设置正确率由75.53%提高至90.89%(χ2=400.57,P<0.01);应用心电监护仪报警参数设置及预警模块前后监护仪参数设置错误患者基本信息比较发现,模块应用后同时期护士管理急危重患者数明显增加[(5.66±0.41)例vs(7.98±0.67)例,t=-4.46,P<0.01],预检分诊Ⅰ、Ⅱ级危重患者参数设置错误例数明显减少(44例vs 26例,χ2=15.60,P<0.01);2组患者在入抢时改良早期预警评分(modified early warning score,MEWS)差异无统计学意义[(4.38±0.16)分vs(4.46±0.36)分,t=-0.20,P=0.84]。结论应用心电监护报警参数自动计算与预警模块能够提升急诊抢救室报警参数设置正确率,大大提升了护理工作效率,更好地保障护理安全,值得临床推广。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.62275244,62375258,62225507,U2033211,62175230,and 62175232)the CAS Project for Young Scientists in Basic Research(No.YSBR-065)+2 种基金Scientific Instrument Developing Project of the Chinese Academy of Sciences(No.YJKYYQ20200001)National Key R&D Program of China(No.2022YFB3607800,No.2022YFB3605800,and No.2022YFB4601501)Key Program of the Chinese Academy of Sciences(ZDBS-ZRKJZ-TLC018)。
文摘The intrusion of obstacles onto railway tracks presents a significant threat to train safety,characterized by sudden and unpredictable occurrences.With China leading the world in high-speed rail mileage,ensuring railway security is paramount.The current laser monitoring technologies suffer from high false alarm rates and unreliable intrusion identification.This study addresses these issues by investigating high-resolution laser monitoring technology for railway obstacles,focusing on key parameters such as monitoring range and resolution.We propose an enhanced non-uniform laser scanning method,developing a laser monitoring system that reduces the obstacle false alarm rate to 2.00%,significantly lower than the 20%standard(TJ/GW135-2015).This rate is the best record for laser monitoring systems on China Railway.Our system operates seamlessly in all weather conditions,providing superior accuracy,resolution,and identification efficiency.It is the only 3D LiDAR system certified by the China State Railway Group Co.,Ltd.(Certificate No.[2023]008).Over three years,our system has been deployed at numerous points along various lines managed by the China State Railway Group,accumulating a dataset of 300,000 observations.This extensive deployment has significantly enhanced railway safety.The development and implementation of our railway laser monitoring system represent a substantial advancement in railway safety technology.Its low false alarm rate(2.00%),high accuracy(20 cm×20 cm×20 cm),and robust performance in diverse conditions underscore its potential for widespread adoption,promising to enhance railway safety in China and internationally.
文摘Several primary factors influencing the alpha energy spectrum of 241Am fire alarm source have been studied in order to get better alpha energy spectrum. The results show that the homogeneity and the thickness of metal surface coat and the size of active area of the source have considerable influence on the alpha energy spectrum of the source.
文摘The safety performance of 241Am fire alarm sources made by using powder metallurgical technology has been preliminarily studied, so as to determine an allowable maximum energy limit value of the alpha particles outgoing from this kind of sources in light of radiation safety and the present technology. The yielded results show that 241Am leak has not been found when the peak energy of the alpha energy spectrum of this kind of sources is less than 4.96 MeV.
文摘目的开发急诊信息系统的心电监护报警参数自动计算与预警模块,并探讨其在急诊危重患者安全管理中的应用效果。方法成立危重患者心电监护报警参数设置的改进团队,设计研发急诊信息系统心电监护报警范围自动计算模块与预警模块。选取2023年3—12月浙江省某三甲医院急诊抢救室使用心电监护的危重患者作为研究对象,将报警范围自动计算与预警模块应用前后分为对照组(2023年3—5月)和观察组(2023年10—12月),比较2组患者心电监护报警参数设置正确率、报警设置错误同时期患者基本情况,观察实践效果。结果应用心电监护仪报警参数设置与预警模块后,心电监护报警参数设置正确率由75.53%提高至90.89%(χ2=400.57,P<0.01);应用心电监护仪报警参数设置及预警模块前后监护仪参数设置错误患者基本信息比较发现,模块应用后同时期护士管理急危重患者数明显增加[(5.66±0.41)例vs(7.98±0.67)例,t=-4.46,P<0.01],预检分诊Ⅰ、Ⅱ级危重患者参数设置错误例数明显减少(44例vs 26例,χ2=15.60,P<0.01);2组患者在入抢时改良早期预警评分(modified early warning score,MEWS)差异无统计学意义[(4.38±0.16)分vs(4.46±0.36)分,t=-0.20,P=0.84]。结论应用心电监护报警参数自动计算与预警模块能够提升急诊抢救室报警参数设置正确率,大大提升了护理工作效率,更好地保障护理安全,值得临床推广。
