The reliability factors of a dragline stripping system were analyzed using system reliability theory to improve its reliability and ensure the stability of surface coal mine production.The relationship between the dra...The reliability factors of a dragline stripping system were analyzed using system reliability theory to improve its reliability and ensure the stability of surface coal mine production.The relationship between the dragline scheduled stripping volume with both the weighted average thickness of the coal seam and the height of the blast casting bench was derived.The results show that the reliability of the dragline stripping system decreases with the weighted average thickness of the coal seam and increases with a reduced casting blast bench height and monthly raw coal production capacity.Furthermore,the dynamic monthly advance distance of the dragline stripping system was found,a new concept of the dragline stripping system reliability and measurement methodology were proposed,and a prediction model for the dragline production capacity was established using a generalized regression neural network.In addition,the steps and processes of the reliability were improved.The study on the Heidaigou surface mine shows that the height of the casting blast bench should be reduced to 10.5 m when its raw coal production capacity is improved from 20 to 30 Mt/a.During the normal production of surface coal,the system reliability can be improved by dynamically determining the weighted average coal seam thickness,accurately predicting the dragline production capacity,and taking other corresponding measures.展开更多
Pathogenic microorganisms can cause infectious diseases in the human body and cause harm to humans.Under the continuous changes of human life style,sudden infectious diseases and sudden pathogenic microbial contaminat...Pathogenic microorganisms can cause infectious diseases in the human body and cause harm to humans.Under the continuous changes of human life style,sudden infectious diseases and sudden pathogenic microbial contamination in food have brought great challenges to human health.Traditional pathogenic microorganism detection is mainly carried out in laboratories with low speed,and requires experienced operators,which greatly affects the detection efficiency,and real-time monitoring cannot be achieved in the face of epidemics or food contamination.In response to these new situations,new on-site rapid detection methods have become a must,but to achieve the purpose of on-site rapid and immediate detection,higher requirements have been put forward to sensitivity and specificity.Due to their special photoelectric properties and adsorption properties,nanomaterials have gradually been applied in on-site rapid detection methods such as biosensors,and some substantial progress has been made.In this study,we introduced the actual application of nanomaterials in testing and their applications in on-site rapid testing,and made some prospects for the development of on-site rapid testing methods.展开更多
基金This work was supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department(Program No.18JS067)the National Natural Science Foundation of China(Program No.51974231).
文摘The reliability factors of a dragline stripping system were analyzed using system reliability theory to improve its reliability and ensure the stability of surface coal mine production.The relationship between the dragline scheduled stripping volume with both the weighted average thickness of the coal seam and the height of the blast casting bench was derived.The results show that the reliability of the dragline stripping system decreases with the weighted average thickness of the coal seam and increases with a reduced casting blast bench height and monthly raw coal production capacity.Furthermore,the dynamic monthly advance distance of the dragline stripping system was found,a new concept of the dragline stripping system reliability and measurement methodology were proposed,and a prediction model for the dragline production capacity was established using a generalized regression neural network.In addition,the steps and processes of the reliability were improved.The study on the Heidaigou surface mine shows that the height of the casting blast bench should be reduced to 10.5 m when its raw coal production capacity is improved from 20 to 30 Mt/a.During the normal production of surface coal,the system reliability can be improved by dynamically determining the weighted average coal seam thickness,accurately predicting the dragline production capacity,and taking other corresponding measures.
文摘Pathogenic microorganisms can cause infectious diseases in the human body and cause harm to humans.Under the continuous changes of human life style,sudden infectious diseases and sudden pathogenic microbial contamination in food have brought great challenges to human health.Traditional pathogenic microorganism detection is mainly carried out in laboratories with low speed,and requires experienced operators,which greatly affects the detection efficiency,and real-time monitoring cannot be achieved in the face of epidemics or food contamination.In response to these new situations,new on-site rapid detection methods have become a must,but to achieve the purpose of on-site rapid and immediate detection,higher requirements have been put forward to sensitivity and specificity.Due to their special photoelectric properties and adsorption properties,nanomaterials have gradually been applied in on-site rapid detection methods such as biosensors,and some substantial progress has been made.In this study,we introduced the actual application of nanomaterials in testing and their applications in on-site rapid testing,and made some prospects for the development of on-site rapid testing methods.
