In actual tunnel engineering, there are few ideal geological conditions, and the always cuts through areas with high incidence of disasters, which increases difficulty construction. this paper, taking special survey work comprehensive geophysical exploration a in unfavorable conditions as an example, we carried out prediction by high-power electrical sounding 3D imaging technology. The results ...

Rock lithology modeling of flood-prone areas has been carried out using the Vertical Electrical Sounding (VES) method in Rawa Makmur village, Bengkulu city. Field data acquisition a stretch length 160 with MAE X612-EM Geoelectric tool forming straight line. VES method, Excel software for resistivity variations depth and Progress modeling. This research aims to determine subsurface condition cha...

Similarities in both water and electric current flows allow the relation of hydraulic geoelectric parameters porous aquifers. Based on this assumption importance for groundwater analyses, study aimed to estimate conductivity (K) transmissivity (T) with vertical electrical sounding (VES) aquifer at experimental farm University Brasilia, Brazil. VES is a geophysical technique that provides resist...

The specific electrical resistance (electrical conductivity) of some layered sedimentary rocks the Baikal natural territory was measured by method radio impedance sounding in VLF-LF ranges electromagnetic waves. Their geoelectric sections are determined. Information about geoelectrical section (GES) can be used engineering and geological surveys Siberia-Mongolia-China gas pipeline route, as wel...

In this paper, we consider uplink channel sounding in time division duplex (TDD) orthogonal frequency division multiplexing (OFDM)-based cellular systems. The channel information provided by uplink sounding may be necessary to exploit closed loop transmission techniques in TDD-OFDM systems. However, conventional sounding schemes may suffer from large sounding overhead, significantly restricting...

In this paper, we consider a new channel sounding scheme for opportunistic scheduling with the use of reduced channel information in the uplink of orthogonal frequency division multiplexing (OFDM)-based wireless systems. To reduce signaling overhead for the sounding, we propose a two step channel sounding process considering the correlation characteristic in the time and frequency domain; calle...