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Ferranti F.,Ghent University | Knockaert L.,Ghent University | Dhaene T.,Ghent University | Antonini G.,Universitadegli Studi dellAquila
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields | Year: 2012

We propose a novel parametric macromodeling method for systems described by scattering parameters, which depend on multiple design variables such as geometrical layout or substrate features. It is able to build accurate multivariate macromodels that are stable and passive over the entire design space. Poles and residues are parameterized indirectly. The proposed method is based on an efficient and reliable combination of rational identification, a procedure to find amplitude and frequency scaling system coefficients and positive interpolation schemes. Pertinent numerical examples validate the proposed parametric macromodeling technique. Copyright © 2011 John Wiley & Sons, Ltd.

Ambrosini D.,Universitadegli Studi DellAquila | Paoletti D.,Universitadegli Studi DellAquila | Di Biase R.,Universitadegli Studi DellAquila
Optical Engineering | Year: 2010

Recently, sandwich holography was proposed in heat transfer studies. This technique can provide the temperature gradient without the need to calculate the temperature map and then numerically differentiate it also phase extraction and phase unwrapping are avoided. A numerical simulation was used to assess the performance of the technique. This investigation shows the ability of the method to obtain the convective coefficient h with an accuracy of about 6%. The measurement algorithm is also relatively robust with respect to noise. © 2010 Society of Photo-Optical Instrumentation Engineers.

Casali N.,National Institute of Nuclear Physics, Italy | Casali N.,Universitadegli Studi dellAquila | Nagorny S.S.,National Institute of Nuclear Physics, Italy | Nagorny S.S.,Ukrainian Academy of Sciences | And 23 more authors.
Journal of Physics G: Nuclear and Particle Physics | Year: 2014

We report on the first compelling observation of α decay of 151Eu to the ground state of 147Pm. The measurement was performed using a 6.15g Li6Eu(BO3)3 crystal operated as a scintillating bolometer. The Q-value and half-life measured are: Q = 1948.9±6.9(stat.) ± 5.1(syst.) keV, and T 1/2 = (4.62 ± 0.95(stat.) ± 0.68(syst.)) 1018 y. The half-life prediction of nuclear theory using the Coulomb and proximity potential model are in good agreement with this experimental result. © 2014 IOP Publishing Ltd.

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