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599 results on '"Verdú, G."'

13. Correlations between Background Radiation inside a Multilayer Interleaving Structure, Geomagnetic Activity, and Cosmic Radiation: A Fourth Order Cumulant-based Correlation Analysis

Author

Iglesias-Martínez, M. E., Castro-Palacio, J. C., Scholkmann, F., Milián-Sánchez, V., de Córdoba, P. Fernández, Mocholí-Salcedo, A., Mocholí, F., Kolombet, V. A., Panchelyuga, V. A., and Verdú, G.

Subjects
Physics - Data Analysis, Statistics and Probability, Nuclear Experiment
Abstract

In this work, we analyzed time-series of background radiation inside a multilayer interleaving structure, geomagnetic activity and cosmic-ray activity using the Pearson correlation coefficient and a new correlation measure based on the one-dimensional component of the fourth order cumulant. The new method is proposed based on the fact that the cumulant of a random process is zero if it is of Gaussian nature. The results show that this methodology is useful for detecting correlations between the analyzed variables., Comment: 8 pages, 2 figures and 4 tables

Published
2020
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38. The Solution of the Lambda Modes Problem Using Block Iterative Eigensolvers

Author

Carreño, A., Vidal-Ferràndiz, A., Ginestar, D., Verdú, G., Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Shi, Yong, editor, Fu, Haohuan, editor, Tian, Yingjie, editor, Krzhizhanovskaya, Valeria V., editor, Lees, Michael Harold, editor, Dongarra, Jack, editor, and Sloot, Peter M. A., editor

Published
2018
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48. Multilevel method to compute the lambda modes of the neutron diffusion equation

Author

Carreño A., Vidal-Ferrándiz A., Ginestar D., and Verdú G.

Subjects
multilevel method, finite element method, modified block newton method, lambda modes, generalized eigenvalue problem, 65f15, 65n30, Mathematics, QA1-939
Abstract

Determination of the reactor kinetic characteristics is very important for the design and development of a new reactor system. In this sense, the computation of lambda modes associated to a nuclear power reactor has interest since these modes can be used to analyze the reactor criticality and to develop modal methods to analyze transient situations in the reactor. In this paper, the lambda problem has been discretized using a high order finite element method to obtain a generalized algebraic eigenvalue problem. A multilevel method is proposed to solve this generalized eigenvalue problem combining a hierarchy of meshes with a Modified Block Newton method. The Krylov-Schur method is used to compare the efficiency of the multilevel method solving several benchmark problems.

Published
2017
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