We explore the use of radial basis functions (RBF) in the weighted essentially non-oscillatory (WENO) reconstruction process used to solve hyperbolic conservation laws, resulting in a numerical method of arbitrarily high order to solve problems with discontinuous solutions. Thanks to the mesh-less property of the RBFs, the method is suitable for non-uniform grids and mesh adaptation. We focus o...

The speci cation of communication behavior is fundamental in devel oping interoperable transactions In particular the temporal ordering of messages exchanged between di erent communicating agents must be declar atively speci ed and veri ed in order to guarantee consistency of data in the various component systems This paper shows that by expressing communi cation constraints in propositional te...

ABSTRACT Four new metal complexes [Cu(ISO)2], [Cu(BUT)2] and [Zn(ISO)2], [Zn(BUT)2] of the polyhydroxychalcones (isoliquiritigenin and butein) are synthesized, structurally characterized and their antioxidant activity is investigated. The formation of the complexes [Cu(ISO)2] and [Zn(ISO)2] is followed by Job's plot using NMR titration. The resulting compounds are characterized by mass spectrom...

Abstract In this paper, a new approach to improve univariate multiquadric operators is surveyed. The presented scheme is obtained by using Hermite interpolating polynomials where the function is approximated by generalized LB quasi-interpolation operator. Error analysis shows that the convergence rate depends on the shape parameter c. Thus, our operators could provide the desired smoothness and...

This paper presents scale-adaptive filters that optimize the detection/separation of compact sources on a background. We assume that the sources have a multiquadric profile, i. e. τ(x) = [1 + (x/rc) ] −λ , λ ≥ 1 2 , x ≡ |~x|, and a background modeled by a homogeneous and isotropic random field, characterized by a power spectrum P (q) ∝ q , γ ≥ 0, q ≡ |~q|. We make an n-dimensional treatment but...

In standard equispaced finite difference (FD) formulas, symmetries can make the order of accuracy relatively high compared to the number of nodes in the FD stencil. With scattered nodes, such symmetries are no longer available. The generalization of compact FD formulas that we propose for scattered nodes and radial basis functions (RBFs) achieves the goal of still keeping the number of stencil ...

This paper examines the numerical solution of the nonlinear coupled Burger’s equations with various values of viscosity by local meshless methods. The local radial basis functions collocation method (LRBFCM) belongs to the class of truly meshless methods which do not need any underlying mesh but work on a set of uniform or random nodes only, without any a priori node to node connectivity. The n...

We have developed a parallel algorithm for radial basis function (rbf) interpolation that exhibits O(N) complexity, requires O(N) storage, and scales excellently up to a thousand processes. The algorithm uses a gmres iterative solver with a restricted additive Schwarz method (rasm) as a preconditioner and a fast matrix-vector algorithm. Previous fast rbf methods—achieving at most O(N logN) comp...

Questo contributo verte sullo studio di 252 terrecotte sequestrate negli anni Settanta del secolo scorso contraddistinte dall’elevata percentuale teste frammentate all’altezza collo e dalla prevalenza soggetti femminili. Il repertorio delle iconografie ricostruibile spazia dai tipi arcaici alle popolarissime tanagrine documenta il frequente ricorso a espedienti tecnici volti differenziare le ra...