In this paper, we studied effect of different parameters including density, viscosity, interfacial tension and solute transfer concentration on phase inversion hold-up. The results showed that change in phase density ratio had no effect on phase inversion hold-up. It also disclosed that the phase viscosity ratio was the most effective parameter affecting phase inversion hold-up and each phase h...

Regularization methods improve the stability of ill-posed inverse problems by introducing some a priori characteristics for solution such as smoothness or sharpness. In this contribution, we propose multidimensional, scale-dependent wavelet-based L1-regularization term to cure ill-posedness airborne (time-domain) electromagnetic induction problem. The regularization is flexible, it can recover ...

The marine controlled-source electromagnetic technique is employed both in large-scale geophysical applications as well within the exploration of hydrocarbons and gas hydrates. Because diffusive character EM field, only very low frequencies are used, leading to inversion results with resolution. In this paper, we calculated resolution matrix associated derived corresponding point-spread functio...

In the presented study, multi-parameter inversion in presence of attenuation is used for reconstruction P- and S- wave velocities density models a synthetic shallow subsurface structure that contains dipping high-velocity layer near surface with varying thicknesses. The problem layers also complicates selection an appropriate initial velocity model. forward solved finite difference, inverse pre...

The smoothness-constrained least-squares method is widely used for two-dimensional (2D) and three-dimensional (3D) inversion of apparent resistivity data sets. The Gauss–Newton method that recalculates the Jacobian matrix of partial derivatives for all iterations is commonly used to solve the least-squares equation. The quasi-Newton method has also been used to reduce the computer time. In this...

This work presents a new approach for high-resolution MRSI of the brain at 7 T in clinically feasible measurement times. Two major problems of MRSI are the long scan times for large matrix sizes and the possible spectral contamination by the transcranial lipid signal. We propose a combination of free induction decay (FID)-MRSI with a short acquisition delay and acceleration via in-plane two-dim...