Results 151 to 160 of about 4,754 (309)
Statistical inverse inference for solving the first kind of nonlinear Fredholm integral equation
Applied Mathematics in Science and EngineeringInverse problems, widely applied in geology, oceanography, and geophysics, are often ill-posed, presenting significant challenges. This study addresses the first kind of nonlinear Fredholm integral equation derived from gravity measurement and magnetic ...
Ailing Wang +3 more
doaj +1 more source
Crosshole resistivity and acoustic velocity imaging : 2.5-D helmholtz equation modeling and inversion / by Zhou Bing. [PDF]
, 1998 Bibliography: leaves 239-248.viii, 248 leaves : ill. ; 30 cm.Shows that the normalised Fourier/Hartley spectral data can be used for imaging when the seismic source wavelet is unknown.Thesis (Ph.D.)--University of Adelaide, Dept.
Bing, Zhou
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Near Surface Geophysics, EarlyView.Abstract Electrical resistivity tomography (ERT) has been shown to be effective for surveying and monitoring dams, due to the method's sensitivity to moisture content and relevant physical properties (e.g., porosity). Automated ERT systems, capable of time‐lapse monitoring, can be used to detect variations in ground conditions.
John S. Ball +4 more
wiley +1 more source
Near Surface Geophysics, EarlyView.Abstract Electrical resistivity tomography (ERT) is one of the most widely used geophysical techniques for hydrogeological questions, such as investigating the groundwater transition zone between land and sea. The interpretation of 2D coast‐parallel ERT profiles is challenging because most of the electrical current flows through the highly conductive ...
Simon Levin Fischer +6 more
wiley +1 more source
Rigorous 3D inversion of marine CSEM data based on the integral equation method [PDF]
, 2007 journal articleMarine controlled-source electromagnetic (MCSEM) surveys have become an important part of offshore petroleum exploration. However, due to enormous computational difficulties with full 3D inversion, practical interpretation of MCSEM data is
Zhdanov, Michael S., Gribenko, A.
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Estimating the critical angle of top near‐surface layers on the Moon
Near Surface Geophysics, EarlyView.Abstract Near‐surface characterization of the lunar subsurface is essential for future exploration and infrastructure development, particularly for the construction of underground habitats that provide protection against radiation and micrometeorites. However, conventional seismic approaches for estimating subsurface properties typically rely on prior ...
Nelson Ricardo Coelho Flores Zuniga +1 more
wiley +1 more source
Geoscience Data JournalTransient electromagnetic (TEM) methods are widely applied to characterise subsurface geological structures relevant to groundwater management. Here, we present a TEM dataset and the resulting resistivity models (available at https://doi.org/10.5281 ...
Line M. Madsen +3 more
doaj +1 more source
, 2012 thesisA new method of rapid interpretation of magnetic field and magnetic tensor field data is introduced. It is based on ideas of potential field migration, which extend to the case of the potential field the general principles of seismic and ...
Cai, Hongzhu
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Coexistence, crossover and extirpation in coalescent communities and ecotones
Oikos, EarlyView.When two ecological communities come into contact, the strength of their mixing determines whether species coexist, extirpate, or extend their ranges. We present analytical formulas and simulations describing these transitions. Specifically, we derive abundance shifts upon community coalescence, identify the critical mixing strength leading to first ...
Martin Heidelman, Dervis Can Vural
wiley +1 more source
, 2009 thesisThe induced polarization (IP) phenomenon has been observed in numerous geologic structures, typically mineralized ore bodies. In polarizable structures a relationship exists between applied frequency and observed conductivity.
Goold, Jonathan W
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