【摘 要】
：
Geophysics offers an important means to investigate the physical processes occurring inside the earth.In particular,since the 1960s,electromagnetic(EM)methods have played important roles in mineral exploration and engineering in-vestigation.Such investiga
【机 构】
：
CAS Engineering Laboratory for Deep Resources Equipment and Technology,Institute of Geology and Geop
论文部分内容阅读
Geophysics offers an important means to investigate the physical processes occurring inside the earth.In particular,since the 1960s,electromagnetic(EM)methods have played important roles in mineral exploration and engineering in-vestigation.Such investigation requires extensive data acquisition and experimental analysis based on geophysical techniques.However,high-performance geophysical equipment,particularly EM exploration equipment,has been dominated by large geophysical companies from the United States,Canada,Germany,and other European countries for decades.This has limited the development of deep exploration technology in China.Recently,we have developed a high-resolution acquisition system with a wireless control unit and a high-power transmitting system for surface EM prospecting(SEP).The new system has been tested in the high-intensity,noisy environment in Jian-sanjiang area,Heilongjiang Province.We then conducted a field survey on the western edge of Qaidam Basin,Qinghai Province.A highly conductive anomaly was found in the upper mantle below the Qinmantage Mountains,which indicates a possible northward fluid channel that runs from below the Qinmantage Mountains to the bottom of the western crust of the Qaidam Basin.Identification of this significant feature was made possible by the new SEP for its better resolution than the previous systems.Also,geophysical analysis confirmed that the thick Cenozoic sediments of the Qaidam Basin are underlain by rigid Precambrian basement rocks and are characterized by a series of folds.The resistivity profile indicates that the Qaidam Basin was formed due to the folding structures in the northern part of the Qinghai-Tibet Plateau which provided an additional evidence for the uplifting of the Qinghai-Tibet Plateau.
其他文献
Although low earth orbit(LEO)satellites can provide high-capacity backhaul to serve the ter-restrial network,the performance of terrestrial-satellite communication systems is critically influenced by the coupling of user association and resource allocatio
Integrated circuits(ICs)and optoelectronic chips are the foundation stones of the modern infor-mation society.The IC industry has been driven by the so-called“Moore\'s law”in the past 60 years,and now has entered the post Moore\'s law era.In this pape
The accumulated large amount of satellite magnetic data strengthens our capability of resolving the electrical conductivity of Earth\'s mantle.To invert these satellite magnetic data,accurate and efficient forward modeling solvers are needed.In this stu
In the study of global change since the 1980s,a new field of Earth system science has been established(Wang et al.,2019).However,compared with the rapid development of geoscience technology and the numerous associated achievements,the theoretical progress
Over the last sixty years,the scaling of silicon-based complementary metal-oxide-semiconductor(CMOS)field-effect transistors(FETs)have promoted the rapid development of microelectronic technology.However,the development of Si CMOS technology is currently
Although considerable success has been achieved in urban air quality prediction (AQP) with machine learning techniques,accurate and long-term prediction is still challenging.One of the key issues for existing AQP approaches is that air quality monitoring
Navigation problems of unmanned air vehicles(UAVs)flying in a formation have been inves-tigated recently,where collision avoidance is a significant issue to be addressed.In this paper,we study resource allocation and power control for radar sensing in a m
Neural architecture search (NAS) methods have been proposed to relieve human experts from tedious architecture engineering.However,most current methods are constrained in small-scale search owing to the issue of huge computational resource consumption.Mea
Satellite communication is attracting increasing attention owing to its freedom from geographical constraints.However,its spectrum resources are limited,and it is susceptible to interferences.Therefore,cognitive radio technology can be used to detect and
Conventional feature selection methods select the same feature subset for all classes,which means that the selected features might work better for some classes than the others.Towards this end,this paper proposes a new semi-supervised local feature select