Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Ralph-Uwe Börner"'
Publikováno v:
International Journal of Mining and Geo-Engineering, Vol 53, Iss 2, Pp 143-150 (2019)
In the last decades, helicopter-borne electromagnetic (HEM) method became a focus of interest in the fields of mineral exploration, geological mapping, groundwater resource investigation and environmental monitoring. As a standard approach, researche
Externí odkaz:
https://doaj.org/article/4f9bd2b811d44a7a8f41864c99aef2e7
Publikováno v:
Geophysical Journal International. 227:1980-1995
SUMMARY We implemented and compared the implicit Euler time-stepping approach, the inverse Fourier transform-based approach and the Rational Arnoldi method for simulating 3-D transient electromagnetic data. We utilize the finite-element method with u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94cce1a4a2d125234f4cf21cab12aa52
https://doi.org/10.1093/gji/ggab302
https://doi.org/10.1093/gji/ggab302
Publikováno v:
Geophysical Journal International. 221:87-96
SUMMARY We present a procedure for localizing underground positions using a time-domain inductive electromagnetic (EM) method. The position to be localized is associated with an EM receiver placed inside the Earth. An EM field is generated by one or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe115bdc92efc415583deee60b4b534a
https://doi.org/10.1093/gji/ggz540
https://doi.org/10.1093/gji/ggz540
Publikováno v:
Journal of Applied Geophysics. 130:131-144
As a standard procedure, multi-frequency helicopter-borne electromagnetic (HEM) data are inverted to conductivity–depth models using 1-D inversion methods, which may, however, fail in areas of strong lateral conductivity contrasts (so-called induct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::827e61bce61e61c903c88a85766697d9
https://doi.org/10.1016/j.jappgeo.2016.04.008
https://doi.org/10.1016/j.jappgeo.2016.04.008
Publikováno v:
Journal of Applied Geophysics. 129:209-221
We present an inversion concept for helicopter-borne frequency-domain electromagnetic (HEM) data capable of reconstructing 3-D conductivity structures in the subsurface. Standard interpretation procedures often involve laterally constrained stitched
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0463092c678d37fd22a1c9c14c9006d
https://doi.org/10.1016/j.jappgeo.2016.03.023
https://doi.org/10.1016/j.jappgeo.2016.03.023
Publikováno v:
Journal of Applied Geophysics. 174:103962
We have developed a novel approach for recovering the induced polarization (IP) effects from one-dimensional (1-D) inversion of helicopter-borne electromagnetic data (HEM). To achieve this aim, we incorporate both electromagnetic and spectral induced
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46fe6f2918012e05ceec208de34867a0
https://doi.org/10.1016/j.jappgeo.2020.103962
https://doi.org/10.1016/j.jappgeo.2020.103962
Publikováno v:
Geophysical Journal International. 202:2025-2043
A computational method is given for solving the forward modeling problem for transient electromagnetic exploration. Its key features are discretization of the quasi-static Maxwell's equations in space using the first-kind family of curl-conforming Ne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b7b6f5d22dffd12dc3e3af884b222f24
https://doi.org/10.1093/gji/ggv224
https://doi.org/10.1093/gji/ggv224
Publikováno v:
Zeitschrift der Deutschen Gesellschaft für Geowissenschaften. 166:149-160
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4535fcce8aeac870bc8ee9be7aef9386
https://doi.org/10.1127/zdgg/2015/0019
https://doi.org/10.1127/zdgg/2015/0019
Publikováno v:
Scopus-Elsevier
We present a cut-&-paste strategy for the 3D inversion of helicopter-borne frequency-domain electromagnetic data. Standard interpretation procedures often involve laterally constrained stitched 1D inversion techniques to create pseudo-3D models that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60d684456c48f65a784c9a43020974bd
https://doi.org/10.3997/2214-4609.201600939
https://doi.org/10.3997/2214-4609.201600939
Publikováno v:
Journal of Applied Geophysics. 75:363-372
We present a 2-D inversion code incorporating a damped least-squares and a minimum-model approach for plane wave electromagnetic (EM) methods using an adaptive unstructured grid finite element forward operator. Unstructured triangular grids permit ef
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f911ed630b7b9742632fea865ceac78b
https://doi.org/10.1016/j.jappgeo.2011.07.011
https://doi.org/10.1016/j.jappgeo.2011.07.011