Results 71 to 80 of about 22,531 (109)
Some of the next articles are maybe not open access.
Research Progress of Electrical Resistance Tomography
2021With the development of the times, the non-destructive testing technology of concrete has been continuously explored by countless scientific researchers to meet the requirements of contemporary people for architecture. It is moving toward more accurate, low-cost, portable, non-radioactive, non-injectable, and the development of features such as ...
Yuhan Li +3 more
openaire +1 more source
Uncertainties Analysis of Electrical Resistivity Tomography
2021<p>We examined the uncertainty of the resistivity method in cavity studies using a synthetic cavity model set at six-different depths. Conceptual models were simulated to generate synthetic resistivity data for dipole-dipole, pole-dipole, Wenner-Schlumberger, and pole-pole arrays.
Yonatan Garkebo Doyoro +2 more
openaire +1 more source
DC Electrical Resistance Tomography Inversion
2021Direct current electrical resistivity imaging is provided by measuring the vertical and horizontal electrical potential variations of subsurface structures using surface and borehole records. To recover the resistivity tomograms from the observed data, a non-linear inverse problem is required to be iteratively solved. A 2.5-dimensional forward modeling
openaire +1 more source
Fault Detection Using Electrical Resistivity Tomography
Symposium on the Application of Geophysics to Engineering and Environmental Problems 2010, 2010Electrical Resistivity Tomography (ERT) data were acquired on the ground surface across an underground limestone mine access tunnel in an effort to characterize the roof rock. This investigation was conducted because simultaneous localized failure occurred on the ceiling of the access tunnel and elsewhere in the mine along a previously unknown ...
Evgeniy V. Torgashov +2 more
openaire +1 more source
Electrical resistance tomography for process applications
Measurement Science and Technology, 1996Measurement of electrical resistivity via four probes is widely used in a variety of applications ranging from geophysical prospecting to silicon wafer manufacture. Electrical resistivity tomography is an extension of this approach and is performed via an array of equi-spaced electrodes mounted into the periphery of a process vessel to map non ...
Fraser Dickin, Mi Wang
openaire +1 more source
Transdimensional Monte Carlo Electrical Resistivity Tomography
Proceedings, 2016The ability to accurately assess and estimate the uncertainty of the solution to an inverse problem is an important aspect of geophysical inversion. Within this paper, we present a stochastic inversion method for electrical resistivity tomography (ERT) which makes use of Bayesian theory, the reversible-jump Markov chain Monte Carlo algorithm, and model
Galetti, E., Curtis, A.
openaire +1 more source
Electrical resistivity tomography for petrophysical investigation
4th EEGS Meeting, 1998Determination of physical parameters of rock samples is essential to characterize their composition and structure. One of these parameters is electrical resistivity. Depending on porosity, resistivity of the pore fluid, saturation degree and matrix properties (esp.
A. Just +4 more
openaire +1 more source
Experience With Anisotropic Inversion For Electrical Resistivity Tomography
15th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2002An iterative, Occam’s-style, regularized inverse approach was used to invert a finite-difference based forward model. The new algorithm was tested on existing data from several sites. The use of the anisotropic inversion algorithm produced images that are less prone to artifacts.
Douglas J. LaBrecque, Dan Casale
openaire +1 more source
3-D Electrical Resistivity Tomography For Environmental Monitoring
9th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 1996Electrical Resistance Tomography (ERT) images the electrical properties of the subsurface using crosshole resistivity measurements. Interpretation of ERT data requires multi-dimensional inverse modeling. We discuss a 3-D Occam`s inversion routine. The routine uses a finite-element forward solution and a conjugate gradient based inverse routine.
Douglas J. LaBrecque +2 more
openaire +1 more source
Effective Electrical Resistivity Tomography Surveys for Environmental Monitoring
Symposium on the Application of Geophysics to Engineering and Environmental Problems 1997, 1997The paper emphasizes the need for careful design of ERT surveys for reliable, high resolution imaging of subsurface processes. In this paper we discuss the use of the resolution radius matrix to compare the resolution achieved with different configurations of electrodes. The most critical factor in designing ERT surveys is the aspect ratio of the image
Douglas J. LaBreque +2 more
openaire +1 more source