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The diffusive behaviour of simple random-walk proposals of many Markov Chain
Monte Carlo (MCMC) algorithms results in slow exploration of the state space making inefficient
the convergence to a target distribution. Hamiltonian/Hybrid Monte Carlo (HMC), by introducing fictious momentum variables,… |
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In this paper, we describe some work aimed at upgrading the Alya code with up-to-date parallel linear solvers capable of achieving reliability, efficiency, and scalability in the computation of the pressure field at each time step of the numerical procedure for solving an LES formulation of the… |
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This paper proposed improving the solve time of the bootstrap AMG proposed previously by the authors. This is achieved by incorporating the information, set of algebraically smooth vectors, generated by the bootstrap algorithm, in a single hierarchy by using sufficiently large aggregates, and these… |
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Convergence of new quadrature rules for approximating the Hilbert transform are given. Numerical tests show the goodness of such approximations |
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We consider here a cell-centered finite difference approximation of the Richards
equation in three dimensions, averaging for interface values the hydraulic conductivity, a highly nonlinear function, by arithmetic, upstream and harmonic
means. The nonlinearities in the equation can lead to changes… |
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Schizophrenia has a complex etiology and symptomatology that is difficult to untangle. After decades of research, important advancements towards a central biomarker are still lacking. One of the missing pieces is a better understanding of how non-linear neural dynamics are altered in this patient… |
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We investigate rare semileptonic B->K*l+l- by looking at the long distance contributions. Our analysis is limited to the very small values of physical accessible range of invariant mass of the leptonic couple q2. We show that the light quarks loop has to be accounted for, along with the charming… |
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The likelihood of a subglacial lake beneath Amundsenisen Plateau at Southern Spitzbergen, Svalbard, pointed out by the flat signal within the Ground Penetrating Radar (GPR) remote survey of the area, is justified, here, via numerical simulation.
This investigation has been developed under the… |
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In this paper, we discuss the convergence of an Algebraic MultiGrid
(AMG) method for general symmetric positive-definite matrices. The
method relies on an aggregation algorithm, named coarsening based on
compatible weighted matching, which exploits the interplay between the
principle of compatible… |
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This paper describes a signal processing application an embedded hardware platform, based on Hilbert transform method for demodulation of digital signals. |
