Karst voids were encountered during road construction in Yongweol-ri, South Korea Attempts to determine the extent of the karst voids through drilling was expensive, time-consuming and too dangerous An electrical resistivity survey was thus carried out to investigate current subsurface geology beneath the proposed road network This investigation was aimed at imaging karstic voids and detecting ...

We study the geometry-dependent resistivity scaling in single-walled carbon nanotube films as a function of nanotube and device parameters using Monte Carlo simulations. We first demonstrate that these simulations can model and fit recent experimental results on the scaling of nanotube film resistivity with device width. Furthermore, we systematically study the effect of four parameters; namely...

The Coulomb interaction between electrons of opposite spin orientations in a metal or in a doped semiconductor results in a negative off-diagonal component of the electrical resistivity matrix—the so-called “spindrag resistivity.” It is generally quite difficult to separate the spin-drag contribution from more conventional mechanisms of resistivity. In this paper I discuss two methods to accomp...

Effects of periodic curvature on the the electrical resistivity of corrugated semiconductor films are theoretically considered. The presence of a curvature-induced potential affects the motion of electrons confined to the thin curved film, resulting in a significant resistivity enhancement at specific values of two geometric parameters: the amplitude and period of the surface corrugation. The m...

Equations are developed for the potential due to a source and sink, or dipole, inside a circle of finite resistivity surrounded by a two-dimensional infinite medium of different resistivity. When the resistivity of the external medium is allowed to increase to infinity, the resulting equations give identical results to those presented by Bayley for the dipole potential in an insulating circle. ...

The estimation of soil parameters of multilayer structure leads to useful information for designing a safe grounding system. This paper presents a nonlinear regression based estimation scheme to extract soil parameters from the kernel function of apparent earth resistivity. The kernel function of apparent earth resistivity can be obtained from the measured apparent earth resistivity data. The p...

Working with epitaxial films of Fe, we succeeded in independent control of different scattering processes in the anomalous Hall effect. The result clearly exposed the fundamental flaws of the conventional scaling rhoAH=f(rho(xx)) between the anomalous Hall resistivity and longitudinal resistivity. A new scaling rhoAH=f(rho(xx0),rho(xx)) that also involves the residual resistivity has been estab...

The calculation of apparent resistivities, based on the model of a homogeneous half-space, is commonly the first step in Ž . order to evaluate helicopter electromagnetic HEM data. Due to the increase in frequencies used in HEM systems, survey results are not only displayed as apparent resistivity maps but also as cross-sections that require resistivity and depth information. After a brief descr...

because of urgent needs of groundwater resources in the tochal region of north tehran, an integration of electric and electromagnetic methods was applied to investigate the location and the direction of water bearing fractures. first, the vlf electromagnetic profiling was performed on suitable places and two locations were detected for supplementary resistivity surveys. then, a number of vertic...

the pellet-type sno2 sensor was synthesized by the solid state method and the effects of additives such as nano zno (1-12 mol %) and nano in2o3 (1-10 mol %) on the co gas sensitivity of sensor were investigated. the optimum sintering temperature was chosen 800°c because of the porosity content of the samples. the phase analysis and microstructure of the samples were studied by x-ray diffraction...