目的探讨基于失效模式与效应分析(Failure Mode and Effects Analysis,FMEA)理论护理模式对经外周静脉置入中心静脉导管(Peripherally Inserted Central Venous Catheters,PICC)患者深静脉血栓形成的发生率及预后的影响。方法选取广州...目的探讨基于失效模式与效应分析(Failure Mode and Effects Analysis,FMEA)理论护理模式对经外周静脉置入中心静脉导管(Peripherally Inserted Central Venous Catheters,PICC)患者深静脉血栓形成的发生率及预后的影响。方法选取广州市第一人民医院于2018年6月—2020年6月收治的126例进行PICC置管的恶性肿瘤患者作为研究对象,应用随机数字表法将其分为参照组与试验组,每组各63例。参照组患者实施常规护理干预,试验组患者实施基于FMEA理论护理模式干预。对比两组患者的危急值、深静脉血栓形成的发生率及预后。结果干预后,试验组患者的危急值水平显著低于参照组患者(P<0.05);试验组患者的深静脉血栓形成的总发生率显著低于参照组患者(P<0.05);试验组患者的内皮素-1值低于参照组患者(P<0.05),一氧化氮水平、肱动脉血流介导性血管扩张水平高于参照组患者(P<0.05)。结论对进行PICC置管的恶性肿瘤患者应用基于FMEA理论护理模式进行干预,能够有效降低患者深静脉血栓形成的发生率,改善患者的预后。展开更多
目的研究基于失效模式和效应分析理论(failure mode and effect analysis,FMEA)构建职业危害自我防护体系用于预防门诊部护士职业暴露的价值。方法将2021年1—7月未开展基于FMEA理论的自我防护体系前采用一般职业暴露防护的30名预防门...目的研究基于失效模式和效应分析理论(failure mode and effect analysis,FMEA)构建职业危害自我防护体系用于预防门诊部护士职业暴露的价值。方法将2021年1—7月未开展基于FMEA理论的自我防护体系前采用一般职业暴露防护的30名预防门诊部护士作为对照组,2021年8月—2022年5月开展基于FMEA理论的自我防护体系的30名预防门诊部护士作为观察组,比较2组职业暴露发生率、科室内安全氛围评分、失效模式评分。结果干预后,与对照组相比,观察组职业暴露总发生率低、安全氛围评分高、失效模式评分低,差异有统计学意义(P<0.05)。结论基于FMEA理论的预防门诊部护士职业危害自我防护体系的应用能够降低职业暴露风险,提高科室内安全氛围,改进职业暴露防护体系。展开更多
In order to more effectively assess the health status of a project, the monitoring indices in a project＇s life cycle are divided into quality index, cost index, time index, satisfaction index, and sustainable develop...In order to more effectively assess the health status of a project, the monitoring indices in a project＇s life cycle are divided into quality index, cost index, time index, satisfaction index, and sustainable development index. Based on the feature of qualitative and quantitative indices combining, the PCA-PR （principal component analysis and pattern recognition） model is constructed. The model first analyzes the principal components of the life-cycle indices system constructed above, and picks up those principal component indices that can reflect the health status of a project at any time. Then the pattern recognition model is used to study these principal components, which means that the real time health status of the project can be divided into five lamps from a green lamp to a red one and the health status lamp of the project can be recognized by using the PR model and those principal components. Finally, the process is shown with a real example and a conclusion consistent with the actual situation is drawn. So the validity of the index system and the PCA-PR model can be confirmed.展开更多
Methodology for the reliability analysis of hydraulic gravity dam is the key technology in current hydropower construction.Reliability analysis for the dynamical dam safety should be divided into two phases:failure mo...Methodology for the reliability analysis of hydraulic gravity dam is the key technology in current hydropower construction.Reliability analysis for the dynamical dam safety should be divided into two phases:failure mode identification and the calculation of the failure probability.Both of them are studied based on the mathematical statistics and structure reliability theory considering two kinds of uncertainty characters(earthquake variability and material randomness).Firstly,failure mode identification method is established based on the dynamical limit state system and verified through example of Koyna Dam so that the statistical law of progressive failure process in dam body are revealed; Secondly,for the calculation of the failure probability,mathematical model and formula are established according to the characteristics of gravity dam,which include three levels,that is element failure,path failure and system failure.A case study is presented to show the practical application of theoretical method and results of these methods.展开更多
Cave roofs are used to support pile foundation in many engineering projects. Accurate stability analysis method of cave roof under pile tip is important in order to ensure the safety of the pile foundation structure. ...Cave roofs are used to support pile foundation in many engineering projects. Accurate stability analysis method of cave roof under pile tip is important in order to ensure the safety of the pile foundation structure. Firstly the mechanical model to analysis the stability of cave roof under pile tip is founded aiming to solve the problems that the simplified mechanical model has. Secondly, the boundary of cave roof is simply supposed to be supported according to the integrity of the rock mass in the boundary of cave roof. Thirdly, based on the theory of plates and shells, the simplified model is calculated and the theoretical calculation formula to determine the safe thickness of cave roof under pile tip can be obtained when the edges of the cave roof are simply supported. In the end, the analysis of the practical engineering project proves the feasibility and the rationality of the method which can be a new method to calculate the safe thickness of cave roof under pile tip.展开更多
In order to study the rules of distribution in a plastic zone of rocks, surrounding a roadway, affected by tectonic stress, we first analyzed the mechanics of a roadway affected by tectonic stress and derived a theore...In order to study the rules of distribution in a plastic zone of rocks, surrounding a roadway, affected by tectonic stress, we first analyzed the mechanics of a roadway affected by tectonic stress and derived a theoretical formula for the plastic zone of rocks surrounding a roadway. We also analyzed the distribution characteristics of the plastic zone under different levels of tectonic stress, vertical pressure, cohesion and friction angle of the surrounding rock. Secondly, we used numerical simulation to analyze the range and shape features of the plastic zone of rocks surrounding the roadway, given different tectonic stress levels. Finally we used a rock drilling detector to carry out field measurements on the broken state of rock surrounding the roadway at the –700 substation and channels in the Xinzhuang mine of the Shenhuo mining area. Given the measured ground stress, we analyzed the relationship between tectonic stress and the distribution of this plastic zone. Our results show that the range of the plastic zone at the top and bottom of the roadway increases with an increase in tectonic stress and this increase is especially obvious at the roadway corner.展开更多
文摘目的探讨基于失效模式与效应分析(Failure Mode and Effects Analysis,FMEA)理论护理模式对经外周静脉置入中心静脉导管(Peripherally Inserted Central Venous Catheters,PICC)患者深静脉血栓形成的发生率及预后的影响。方法选取广州市第一人民医院于2018年6月—2020年6月收治的126例进行PICC置管的恶性肿瘤患者作为研究对象,应用随机数字表法将其分为参照组与试验组,每组各63例。参照组患者实施常规护理干预,试验组患者实施基于FMEA理论护理模式干预。对比两组患者的危急值、深静脉血栓形成的发生率及预后。结果干预后,试验组患者的危急值水平显著低于参照组患者(P<0.05);试验组患者的深静脉血栓形成的总发生率显著低于参照组患者(P<0.05);试验组患者的内皮素-1值低于参照组患者(P<0.05),一氧化氮水平、肱动脉血流介导性血管扩张水平高于参照组患者(P<0.05)。结论对进行PICC置管的恶性肿瘤患者应用基于FMEA理论护理模式进行干预,能够有效降低患者深静脉血栓形成的发生率,改善患者的预后。
文摘目的研究基于失效模式和效应分析理论(failure mode and effect analysis,FMEA)构建职业危害自我防护体系用于预防门诊部护士职业暴露的价值。方法将2021年1—7月未开展基于FMEA理论的自我防护体系前采用一般职业暴露防护的30名预防门诊部护士作为对照组,2021年8月—2022年5月开展基于FMEA理论的自我防护体系的30名预防门诊部护士作为观察组,比较2组职业暴露发生率、科室内安全氛围评分、失效模式评分。结果干预后,与对照组相比,观察组职业暴露总发生率低、安全氛围评分高、失效模式评分低,差异有统计学意义(P<0.05)。结论基于FMEA理论的预防门诊部护士职业危害自我防护体系的应用能够降低职业暴露风险,提高科室内安全氛围,改进职业暴露防护体系。
基金The Social Science Fund of Hebei Province (No.200607011)the Key Science and Technology Project of Hebei Province(No.07213529)
文摘In order to more effectively assess the health status of a project, the monitoring indices in a project＇s life cycle are divided into quality index, cost index, time index, satisfaction index, and sustainable development index. Based on the feature of qualitative and quantitative indices combining, the PCA-PR （principal component analysis and pattern recognition） model is constructed. The model first analyzes the principal components of the life-cycle indices system constructed above, and picks up those principal component indices that can reflect the health status of a project at any time. Then the pattern recognition model is used to study these principal components, which means that the real time health status of the project can be divided into five lamps from a green lamp to a red one and the health status lamp of the project can be recognized by using the PR model and those principal components. Finally, the process is shown with a real example and a conclusion consistent with the actual situation is drawn. So the validity of the index system and the PCA-PR model can be confirmed.
基金Projects(51021004,51379141)supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China
文摘Methodology for the reliability analysis of hydraulic gravity dam is the key technology in current hydropower construction.Reliability analysis for the dynamical dam safety should be divided into two phases:failure mode identification and the calculation of the failure probability.Both of them are studied based on the mathematical statistics and structure reliability theory considering two kinds of uncertainty characters(earthquake variability and material randomness).Firstly,failure mode identification method is established based on the dynamical limit state system and verified through example of Koyna Dam so that the statistical law of progressive failure process in dam body are revealed; Secondly,for the calculation of the failure probability,mathematical model and formula are established according to the characteristics of gravity dam,which include three levels,that is element failure,path failure and system failure.A case study is presented to show the practical application of theoretical method and results of these methods.
基金Project(14JJ4003) supported by the Natural Science Foundation of Hunan Province,ChinaProject(2013M531812) supported by China Postdoctoral Science Foundation+1 种基金Project supported by the Postdoctoral Foundation of Central South UniversityProject(14JJ4003) Project(2013SCEEKL001) supported by Foundation of Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,China
文摘Cave roofs are used to support pile foundation in many engineering projects. Accurate stability analysis method of cave roof under pile tip is important in order to ensure the safety of the pile foundation structure. Firstly the mechanical model to analysis the stability of cave roof under pile tip is founded aiming to solve the problems that the simplified mechanical model has. Secondly, the boundary of cave roof is simply supposed to be supported according to the integrity of the rock mass in the boundary of cave roof. Thirdly, based on the theory of plates and shells, the simplified model is calculated and the theoretical calculation formula to determine the safe thickness of cave roof under pile tip can be obtained when the edges of the cave roof are simply supported. In the end, the analysis of the practical engineering project proves the feasibility and the rationality of the method which can be a new method to calculate the safe thickness of cave roof under pile tip.
基金Financial support for this work, provided by the research fund of the State Key Laboratory of Coal Resources and Mine Safety of the China University of Mining & Technology (No.08kf11) is gratefully ac-knowledged
文摘In order to study the rules of distribution in a plastic zone of rocks, surrounding a roadway, affected by tectonic stress, we first analyzed the mechanics of a roadway affected by tectonic stress and derived a theoretical formula for the plastic zone of rocks surrounding a roadway. We also analyzed the distribution characteristics of the plastic zone under different levels of tectonic stress, vertical pressure, cohesion and friction angle of the surrounding rock. Secondly, we used numerical simulation to analyze the range and shape features of the plastic zone of rocks surrounding the roadway, given different tectonic stress levels. Finally we used a rock drilling detector to carry out field measurements on the broken state of rock surrounding the roadway at the –700 substation and channels in the Xinzhuang mine of the Shenhuo mining area. Given the measured ground stress, we analyzed the relationship between tectonic stress and the distribution of this plastic zone. Our results show that the range of the plastic zone at the top and bottom of the roadway increases with an increase in tectonic stress and this increase is especially obvious at the roadway corner.
