1,720,968 research outputs found
A Mesh-Free Approach for Coupled Electromagnetic-Mechanical Problems
No full textA numerical approach to the resolution of coupled electromagnetic-mechanical problems by means of a mesh-free
formulation is here proposed. Possible discontinuities are treated by means of a jump function, and full advantages are taken
of the capabilities of mesh-free methods in the treatment of deforming domains. In order to highlight the effectiveness of the
proposed approach, two quasi-static electromagnetic-mechanical problems in a 1-D and a 2-D configuration are presented
An Approach to the Electrical Resistive Tomography Based on Meshless Methods
No full textElectrical resistance tomography is a noninvasive diagnostic technique based on the identification of the conductivity profile inside a
control volume using injected low-frequency currents. Possible advantages in clinical applications coming from a numerical approach
based on the combination of meshless method and finite element method are discussed
Effect of anisotropy in estimation of brain sources and conductivities via coupled EEG and MEG
No full textPurpose: This paper proposes an approach for the coupled EEG-MEG data analysis that takes into account the
anisotropy of brain tissues and the different sensitivities of EEG and MEG measurements.
Design/methodology/approach: The study is carried out by using a combination of analytical and numerical methods. In
particular, where available, closed solutions are used to evaluate the numerical errors, while FEM models are used where
anisotropy and geometrical characteristics make analytical solutions not applicable.
Findings: The impact of tissues anisotropy on coupled EEG-MEG analysis has been assessed, and the effectiveness of
an approach based on smart exploitation of different EEG and MEG sensitivity to improve sources reconstruction has been
demonstrated numerically.
Research limitations/implications: The analysis has been carried out using a spherical head model, and on simulated data.
Practical implications: The proposed approach allows to improve the localization of equivalent sources for the description
of cellular brain activity.
Originality/value: The properties of objective functions used in brain sources reconstruction from EEG and MEG has been
investigated taking into account tissues anisotropy in the spherical symmetric case. In addition a formulation of the joint source
and tissues tensor conductivity estimation by exploiting simultaneously bioelectric and biomagnetic measurements based on
the complementary sensitivity of those measurements has been presented
Coupled FE-Meshless Methods for Electromagnetic Low-Frequency Problems
No full textA numerical approach to the resolution of coupled electromagnetic-mechanical problems by means of a mesh-free formulation is here proposed. Possible discontinuities are treated by means of a jump function, and full advantages are taken of the capabilities of mesh-free methods in the treatment of deforming domains. In order to highlight the effectiveness of the proposed approach, two quasi-static electromagnetic-mechanical problems in a 1-D and a 2-D configuration are presented
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