Based on core and thin section data,the source rock samples from the Fengcheng Formation in the Mahu Sag of the Junggar Basin were analyzed in terms of zircon SIMS U-Pb geochronology,organic carbon isotopic compositio...Based on core and thin section data,the source rock samples from the Fengcheng Formation in the Mahu Sag of the Junggar Basin were analyzed in terms of zircon SIMS U-Pb geochronology,organic carbon isotopic composition,major and trace element contents,as well as petrology.Two zircon U-Pb ages of(306.0±5.2)Ma and(303.5±3.7)Ma were obtained from the first member of the Fengcheng Formation.Combined with carbon isotopic stratigraphy,it is inferred that the depositional age of the Fengcheng Formation is about 297-306 Ma,spanning the Carboniferous-Permian boundary and corresponding to the interglacial period between C4 and P1 glacial events.Multiple increases in Hg/TOC ratios and altered volcanic ash were found in the shale rocks of the Fengcheng Formation,indicating that multiple phases of volcanic activity occurred during its deposition.An interval with a high B/Ga ratio was found in the middle of the second member of the Fengcheng Formation,associated with the occurrence of evaporite minerals and reedmergnerite,indicating that the high salinity of the water mass was related to hydrothermal activity.Comprehensive analysis suggests that the warm and humid climate during the deposition of Fengcheng Formation is conducive to the growth of organic matter such as algae and bacteria in the lake,and accelerates the continental weathering,driving the input of nutrients.Volcanic activities supply a large amount of nutrients and stimulate primary productivity.The warm climate and high salinity are conducive to water stratification,leading to water anoxia that benefits organic matter preservation.The above factors interact and jointly control the enrichment of organic matter in the Fengcheng Formation of Mahu Sag.展开更多
针对传统无线定位问题中基于接收信号强度指示(Received Signal Strength Indicator,RSSI)的测距与定位方法精度过于依赖RSSI测距精度,以至于提升定位精度成本较大的问题,提出了基于深度学习与信息交互的第5代移动通信技术(5G)终端群组...针对传统无线定位问题中基于接收信号强度指示(Received Signal Strength Indicator,RSSI)的测距与定位方法精度过于依赖RSSI测距精度,以至于提升定位精度成本较大的问题,提出了基于深度学习与信息交互的第5代移动通信技术(5G)终端群组定位方法,以降低其对基站与终端间RSSI测距精度的依赖。在5G终端群组条件下,基于终端间的相互测距信息,利用终端间测距误差较小的特点来弥补基站与终端间RSSI测距的误差,并结合深度神经网络,将接收到的RSSI信号作为输入特征、位置信息作为输出特征,进行模型训练并输出5G终端群组定位结果,使得最终定位精度得到有效提升。仿真试验验证了所提出方法的有效性。展开更多
基金Supported by the National Natural Science Foundation of China(41802177,42272188,42303056)PetroChina Prospective and Basic Technological Project(2022DJ0507)+1 种基金Research Fund of PetroChina Basic Scientific Research and Strategic Reserve Technology(2020D-5008-04)National Natural Science of Sichuan Province(23NSFSC546)。
文摘Based on core and thin section data,the source rock samples from the Fengcheng Formation in the Mahu Sag of the Junggar Basin were analyzed in terms of zircon SIMS U-Pb geochronology,organic carbon isotopic composition,major and trace element contents,as well as petrology.Two zircon U-Pb ages of(306.0±5.2)Ma and(303.5±3.7)Ma were obtained from the first member of the Fengcheng Formation.Combined with carbon isotopic stratigraphy,it is inferred that the depositional age of the Fengcheng Formation is about 297-306 Ma,spanning the Carboniferous-Permian boundary and corresponding to the interglacial period between C4 and P1 glacial events.Multiple increases in Hg/TOC ratios and altered volcanic ash were found in the shale rocks of the Fengcheng Formation,indicating that multiple phases of volcanic activity occurred during its deposition.An interval with a high B/Ga ratio was found in the middle of the second member of the Fengcheng Formation,associated with the occurrence of evaporite minerals and reedmergnerite,indicating that the high salinity of the water mass was related to hydrothermal activity.Comprehensive analysis suggests that the warm and humid climate during the deposition of Fengcheng Formation is conducive to the growth of organic matter such as algae and bacteria in the lake,and accelerates the continental weathering,driving the input of nutrients.Volcanic activities supply a large amount of nutrients and stimulate primary productivity.The warm climate and high salinity are conducive to water stratification,leading to water anoxia that benefits organic matter preservation.The above factors interact and jointly control the enrichment of organic matter in the Fengcheng Formation of Mahu Sag.
文摘针对传统无线定位问题中基于接收信号强度指示(Received Signal Strength Indicator,RSSI)的测距与定位方法精度过于依赖RSSI测距精度,以至于提升定位精度成本较大的问题,提出了基于深度学习与信息交互的第5代移动通信技术(5G)终端群组定位方法,以降低其对基站与终端间RSSI测距精度的依赖。在5G终端群组条件下,基于终端间的相互测距信息,利用终端间测距误差较小的特点来弥补基站与终端间RSSI测距的误差,并结合深度神经网络,将接收到的RSSI信号作为输入特征、位置信息作为输出特征,进行模型训练并输出5G终端群组定位结果,使得最终定位精度得到有效提升。仿真试验验证了所提出方法的有效性。
