Results 1 to 10 of about 163,305 (122)

Acoustic Impedance Inversion from Seismic Imaging Profiles Using Self Attention U-Net

Remote Sensing, 2023
Seismic impedance inversion is a vital way of geological interpretation and reservoir investigation from a geophysical perspective. However, it is inevitably an ill-posed problem due to the noise or the band-limited characteristic of seismic data ...
Liurong Tao, Haoran Ren, Zhiwei Gu
doaj   +2 more sources

Heavy metals and radionuclides in Islamabad's industrial area: A comprehensive analysis of soil and water pollution, source apportionment and health effects using statistical and geospatial tools

Journal of Trace Elements and Minerals
Introduction: Heavy metal pollution in industrial areas around the world is a significant problem that is worsening day by day. Heavy and toxic metals are detrimental to human health and ecology in a region.
Mavia Anjum, Naila Siddique, Hannan Younis, Yasir Faiz, Munib Ahmed Shafique, Anjum Mahnoor, Ayesha Sajid, Muhammad Altaf   +7 more
doaj   +2 more sources

ReconFormer: Accelerated MRI Reconstruction Using Recurrent Transformer [PDF]

IEEE Transactions on Medical Imaging, 2022
The accelerating magnetic resonance imaging (MRI) reconstruction process is a challenging ill-posed inverse problem due to the excessive under-sampling operation in ${k}$ -space.
Pengfei Guo, Yiqun Mei, Jinyuan Zhou, Shanshan Jiang, Vishal M. Patel   +4 more
semanticscholar   +1 more source

Reconstructing lattice QCD spectral functions with stochastic pole expansion and Nevanlinna analytic continuation [PDF]

Physical Review D, 2023
The reconstruction of spectral functions from Euclidean correlation functions is a well-known, yet ill-posed inverse problem in the fields of many-body and high-energy physics.
Li Huang, S. Liang
semanticscholar   +1 more source

Supervised learning in Hamiltonian reconstruction from local measurements on eigenstates [PDF]

Journal of Physics: Condensed Matter, 2020
Reconstructing a system Hamiltonian through measurements on its eigenstates is an important inverse problem in quantum physics. Recently, it was shown that generic many-body local Hamiltonians can be recovered by local measurements without knowing the ...
Chenfeng Cao, Shi-Yao Hou, Ningping Cao, B. Zeng   +3 more
semanticscholar   +1 more source

Inverse Random Source Scattering for the Helmholtz Equation with Attenuation [PDF]

SIAM Journal on Applied Mathematics, 2019
In this paper, a new model is proposed for the inverse random source scattering problem of the Helmholtz equation with attenuation. The source is assumed to be driven by a fractional Gaussian field whose covariance is represented by a classical pseudo ...
Peijun Li, Xu Wang
semanticscholar   +1 more source

Modified covariance beamformer for solving MEG inverse problem in the environment with correlated sources

NeuroImage, 2021
Magnetoencephalography (MEG) is a neuroimaging method ideally suited for non-invasive studies of brain dynamics. MEG’s spatial resolution critically depends on the approach used to solve the ill-posed inverse problem in order to transform sensor signals ...
Aleksandra Kuznetsova, Yulia Nurislamova, Alexei Ossadtchi   +2 more
doaj   +1 more source

Residual stress determination by blind hole drilling and local displacement mapping in aluminium alloy aerospace components

Fracture and Structural Integrity
The determination of residual stresses by combining blind hole drilling and optical interferometric measurement of relief deformation is re-visited to evaluate its applicability to aerospace structures.
Sviatoslav Eleonsky, Vladimir Pisarev, Eugene S. Statnik, Alexey I. Salimon, Alexander M. Korsunsky   +4 more
doaj   +5 more sources

Shale gas production forecasting is an ill-posed inverse problem and requires regularization

, 2020
Decline curve analysis (DCA)—the extrapolation of a production curve model fitted to a well’s past production—remains the standard approach for forecasting unconventional oil and gas production.
J. Montgomery, S. Raymond, F. O'sullivan, J. Williams   +3 more
semanticscholar   +1 more source

Conditioning bounds for traveltime tomography in layered media [PDF]

, 2011
This paper revisits the problem of recovering a smooth, isotropic, layered wave speed profile from surface traveltime information. While it is classic knowledge that the diving (refracted) rays classically determine the wave speed in a weakly well-posed ...
Abramowitz M, Aki K, Bal G, Bateman H, Collar A R, DeVore R, Grenander U, H Baek, Herglotz G, Knutson A, L Demanet, Leung S, Shearer P, Shohat J, Simon B, Stefanov P, Stork C, Whitham G B, Wiechert E   +18 more
core   +3 more sources