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Título: | Frequency domain description of Kohlrausch response through a pair of Havriliak-Negami-type functions: An analysis of functional proximity |
Autor: | Medina, J. S. CSIC; Prosmiti, Rita CSIC ORCID; Villarreal, Pablo CSIC ORCID; Delgado Barrio, Gerardo CSIC ORCID ; Alemán, J. V. | Fecha de publicación: | 2011 | Editor: | American Physical Society | Citación: | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 84: 066703 (2011) | Resumen: | An approximation to the Fourier transform (FT) of the Kohlrausch function (stretched exponential) with shape parameter 0<β≤1 is presented by using Havriliak-Negami-like functions. Mathematical expressions to fit their parameters α, γ, and τ, as functions of β (0<β≤1 and 1<β<2) are given, which allows a quick identification in the frequency domain of the corresponding shape factor β. Reconstruction via fast Fourier transform of frequency approximants to time domain are shown as good substitutes in short times though biased in long ones (increasing discrepancies as β→1). The method is proposed as a template to commute time and frequency domains when analyzing complex data. Such a strategy facilitates intensive algorithmic search of parameters while adjusting the data of one or several Kohlrausch-Williams-Watts relaxations. © 2011 American Physical Society. | URI: | http://hdl.handle.net/10261/58291 | DOI: | 10.1103/PhysRevE.84.066703 | Identificadores: | doi: 10.1103/PhysRevE.84.066703 issn: 1539-3755 |
Aparece en las colecciones: | (CFMAC-IFF) Artículos |
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