Magnetotelluric (MT) method is an electromagnetic technique that uses the earth natural field to map the electrical resistivity changes in subsurface structures. Because of the high penetration depth of the electromagnetic fields in this method (tens of meters to tens of kilometers), the MT data is used to investigate the shallow to deep subsurface geoelectrical structures and their dimensions....

The resistivity of oil impregnated paper will decrease during its aging process. This paper takes paper resistivity as an assessment index to evaluate the insulation condition of oil impregnated paper in power transformer. The feasibility of this method are discussed in two aspects: reliability and sensitivity. Iterative inversion of paper resistivity was combined with finite element simulation...

Soil degradation and low productivity are among the major agricultural problems facing farmers of newly reclaimed area in Nile Delta region, Egypt. High content clay silt characterizes soil texture all farms area, while still rely on traditional mole drainage (MD) system to reduce salinity farm soil. We present a comparison innovative geo-resistivity methods evaluate drains affected soils. Geoe...

[1] Interpretation of the EarthScope MT (magnetotelluric) data requires the development of a large‐scale inversion method which can address two common problems of 3D MT inversion: computational time andmemory requirements. We have developed an efficient method of 3D MT inversion based on an IE (integral equation) formulation of the MT forward modeling problem and a receiver footprint approach, ...

geophysical techniques remain the only ways to remotely and non-destructively sense the earth’s near subsurface and as such have the most promising prospect for rapid and accurate detection of underground tunnels. today, electrical resistivity and seismic refraction geophysical methods have been greatly developed to identify structures and underground cavities. in this study, the ability of the...

Landslides are one of the factors caused by subsurface structures that not compact, and have low density or resistivity values due to changes in groundwater. Rainwater infiltrates into ground will reach an impermeable layer which is identified as a slip plane. This research was conducted Kastoba Lake area, Bawean Island, Indonesia. The purpose this study determine plane direction landslide stud...

Numerous farmers regularly irrigate their farms with inadequately treated sewage water pumped from the system in Arab El-Madabegh district of Assiut City, Egypt. According to previous studies, long-term irrigation partially resulted significant changes physicochemical properties soil. The principal goals this study are (1) infer empirical equations between geoelectrical resistivity measurements...

Abstract The effects of drought on tree mortality at forest stands are not completely understood. For assessing their water supply, knowledge the small-scale distribution soil moisture as well its temporal changes is a key issue in an era climate change. However, traditional methods like taking samples or installing data loggers solely collect parameters single point small volume. Electrical re...

To establish fast, nondestructive, and inexpensive methods for resistivity measurements of SiC wafers, different resistivity-measurement techniques were tested for characterization of semi-insulating SiC wafers, namely, the four-point probe method with removable graphite contacts, the van der Pauw method with annealed metal and diffused contacts, the current-voltage (I-V) technique, and the con...