Gravity data inversion is one of the important steps in the interpretation of practical gravity data. The inversion result can be obtained by minimization of the Tikhonov objective function. The determination of an optimal regularization parameter is highly important in the gravity data inversion. In this work, an attempt was made to use the active constrain balancing (ACB) method to select the...

Conventional multichannel surveys provide good images in 2D and 3D of the Earth depth, which are successfully used for oil gas industries. However, their cost environmental impact make them rarely affordable engineering applications, especially offshore infrastructures. In this case, monochannel systems, such as Boomers, having cables that a few-meters long, time-domain useful but miss relevant...

We present a shape manipulation technique capable of producing deformations of 2D and 3D meshes, guaranteeing that no elements will be inverted. We achieve this by augmenting the quadratic ex-rotated elastic energy with additional convex terms that penalize the presence of inverted elements. Using a schedule of increasing penalty coefficients, we efficiently and robustly converge to an inversio...

Abstract. In this paper we propose a stochastic algorithm applied to an electromagnetic inverse scattering problem. The objective is to characterize an unknown object from measurements of the scattered fields at different frequencies and for several illuminations. This inverse problem is known to be nonlinear and ill-posed. It then needs to be regularized by introducing prior information. The p...

In this paper we propose a stochastic algorithm applied to an electromagnetic inverse scattering problem. The objective is to characterize an unknown object from measurements of the scattered fields at different frequencies and for several illuminations. This inverse problem is known to be nonlinear and ill-posed. It then needs to be regularized by introducing prior information. The particular ...

Background Late gadolinium enhancement (LGE) imaging is the standard method of assessment of myocardial viability. Conventional Cartesian phase sensitive inversion recovery (PSIR) LGE imaging is usually performed as a stack of 2D slices, with each slice being acquired in a single breath-hold [1]. Repeated breath-holding is time consuming and can be difficult or tiring for patients which can lea...

KEYWORDS piezoelectricity, two-dimensional (2D) material, monochalcogenide, density functional theory (DFT) calculation ABSTRACT It is found that several layer-phase group-III monochalcogenides, including GaS, GaSe, and InSe, are piezoelectric in their monolayer form. First-principles calculations reveal that the piezoelectric coefficients of monolayer GaS, GaSe, and InSe (2.06, 2.30, and 1.46 ...

Background LGE is widely used as a means to quantify scar or fibrotic tissue in patients suffering from cardiomyopathies. In clinical routine 2D data acquisition is most commonly practiced, albeit having the drawback of multiple breath-holds and long acquisition times. 3D acquisition can significantly reduce acquisition time. This leads to shortened scan time and a more efficient use of availab...

electromagnetic methods are widely used for the study of subsurface resistivity structures. these methods are based on the response of the subsurface structures to electromagnetic fields. the magnetotelluric (mt) method is an electromagnetic technique that uses the natural, time varying electric and magnetic field components measured at right angles to the surface of the earth, to make inferenc...