China’s first Mars rover,Zhurong,successfully landed in the south of Utopia Planitia.The surface water content at the landing area can provide constraints on mineral formation conditions and help us better understand...China’s first Mars rover,Zhurong,successfully landed in the south of Utopia Planitia.The surface water content at the landing area can provide constraints on mineral formation conditions and help us better understand the evolution of the Martian aqueous and geological environment.In this work,the surface kinetic temperature of the Zhurong landing area was derived by analyzing data from the Mars Express Observatoire pour la Minéralogie,l’Eau,les Glaces et l’Activité(OMEGA)spectrometer.Using the Discrete Ordinate Radiative Transfer(DISORT)model,we performed atmospheric correction and thermal correction for the OMEGA data to obtain the surface effective single-particle absorption thickness(ESPAT)parameter to evaluate the surface water content.The surface water content distribution at the landing area was relatively uniform at a lateral scale of~10 km.At the Zhurong landing site,the surface water content in the topmost layer(a few hundred micrometers)of the regolith was 5−8 weight percent water(wt%H_(2)O),assuming surface particle sizes of<45μm,or 1.6−2.5 wt%H_(2)O,assuming surface particle sizes in the range of 125−250μm.The Mars Surface Composition Detector(MarSCoDe)onboard Zhurong also observed significant H_(2)O/OH signals in the landing area.Our results provide an important regional context for the hydration state of the area and can be further verified by the H content derived from the Laser-Induced Breakdown Spectrometer(LIBS)data of MarSCoDe.展开更多
以国内某大型高炉降料面停炉工作为实践背景,对整个降料面停炉过程进行分析总结,通过制订详细的停炉方案,以及停炉前精心准备,停炉过程精细操作,实现了高炉全煤气回收及快速、安全停炉,整个停炉用时6 h 50 min,精准降到目标料线,为缩短...以国内某大型高炉降料面停炉工作为实践背景,对整个降料面停炉过程进行分析总结,通过制订详细的停炉方案,以及停炉前精心准备,停炉过程精细操作,实现了高炉全煤气回收及快速、安全停炉,整个停炉用时6 h 50 min,精准降到目标料线,为缩短检修工期和顺利开炉创造了良好条件。展开更多
Coal mine water hazard is one of the five major disasters, especial y for the mining area in North China Karst 9# coal mine, Coal Seam Floor Water strong Ordovician aquifer would pose a huge threat to mine safety. In ...Coal mine water hazard is one of the five major disasters, especial y for the mining area in North China Karst 9# coal mine, Coal Seam Floor Water strong Ordovician aquifer would pose a huge threat to mine safety. In fact, al major coal mine water inrush occurred before, except for some visible sign of, but also includes non-visible sign, namely, water inrush Hydrogeochemistry implied. If you can capture and use this information in a timely manner to carry out analysis of hydrogeochemical characteristics, for identifying sources and determine the possibility of water inrush occurred has important practical significanceFuzzy identification method and the above two methods, is more suitable for coal mine water inrush identification. Discrimination results from the side reflects the Ordovician limestone aquifer and the limestone aquifer Daqing Chemical Characteristics of relatively independent, indicating that the two wel s in the Ge Quan-east aquifer hydraulic connection weak. Ordovician limestone aquifer and the Benxi limestone aquifers have some similar chemical characteristics, showing the Ordovician and the Benxi limestone aquifer has a hydraulic connection.展开更多
基金funded by the National Key Research and Development Project(Grant No.2019YFE0123300)the National Natural Science Foundation of China(Grant No.42072337)+1 种基金the preresearch project on Civil Aerospace Technologies(Grant Nos.D020101 and D020102)funded by the China National Space Administration through the Pandeng Program of the National Space Science Center,Chinese Academy of Sciences,Key Research Program of the Chinese Academy of Sciences(Grant No.ZDBS-SSW-TLC001).
文摘China’s first Mars rover,Zhurong,successfully landed in the south of Utopia Planitia.The surface water content at the landing area can provide constraints on mineral formation conditions and help us better understand the evolution of the Martian aqueous and geological environment.In this work,the surface kinetic temperature of the Zhurong landing area was derived by analyzing data from the Mars Express Observatoire pour la Minéralogie,l’Eau,les Glaces et l’Activité(OMEGA)spectrometer.Using the Discrete Ordinate Radiative Transfer(DISORT)model,we performed atmospheric correction and thermal correction for the OMEGA data to obtain the surface effective single-particle absorption thickness(ESPAT)parameter to evaluate the surface water content.The surface water content distribution at the landing area was relatively uniform at a lateral scale of~10 km.At the Zhurong landing site,the surface water content in the topmost layer(a few hundred micrometers)of the regolith was 5−8 weight percent water(wt%H_(2)O),assuming surface particle sizes of<45μm,or 1.6−2.5 wt%H_(2)O,assuming surface particle sizes in the range of 125−250μm.The Mars Surface Composition Detector(MarSCoDe)onboard Zhurong also observed significant H_(2)O/OH signals in the landing area.Our results provide an important regional context for the hydration state of the area and can be further verified by the H content derived from the Laser-Induced Breakdown Spectrometer(LIBS)data of MarSCoDe.
文摘Coal mine water hazard is one of the five major disasters, especial y for the mining area in North China Karst 9# coal mine, Coal Seam Floor Water strong Ordovician aquifer would pose a huge threat to mine safety. In fact, al major coal mine water inrush occurred before, except for some visible sign of, but also includes non-visible sign, namely, water inrush Hydrogeochemistry implied. If you can capture and use this information in a timely manner to carry out analysis of hydrogeochemical characteristics, for identifying sources and determine the possibility of water inrush occurred has important practical significanceFuzzy identification method and the above two methods, is more suitable for coal mine water inrush identification. Discrimination results from the side reflects the Ordovician limestone aquifer and the limestone aquifer Daqing Chemical Characteristics of relatively independent, indicating that the two wel s in the Ge Quan-east aquifer hydraulic connection weak. Ordovician limestone aquifer and the Benxi limestone aquifers have some similar chemical characteristics, showing the Ordovician and the Benxi limestone aquifer has a hydraulic connection.
