Ji-shan He: a Brief Biography

Abstract

Professor He, as a famous geophysicist, an educator, an engineering management theorist, and one of the scientists who epitomize the electromagnetic methods in China, has been making a long-term commitment on the theory and methodology of geophysics and the system of observing apparatuses. He created the Dual Frequency Induced Polarization (IP) method and invented the Dual Frequency IP instrument. He not just caught up with the closed addition in a three-element set, but also proposed the fast recursive coding of 2n Sequence Pseudo-Random Signal, and created the electrical system based on Pseudo-Random Signal as well. Moreover, he invented the Flow-Field method with highresolution to detect the water inlet of the piping and seepage in dykes and dams, which provides the essential technical support and the scientific decision-making basis of emergency restoration for detecting the hidden dangers of dilapidated reservoirs and investigating the hazards of embankments in flood season. He unified the definition and algorithm of the entire field resistivity of the frequency domain electromagnetic methods, and created the Wide Field Electromagnetic method to open up a brand-new research area for the electromagnetic exploration. He also created in his area the first National Key Discipline of China, which features the geo-electric field and observation system. He has been involved in the geophysics research for a long time, making outstanding academic achievements.