Harnessing Evolutionary Programming for Impedance Spectroscopy Analysis

Created by W.Langdon from gp-bibliography.bib Revision:1.3973

@PhdThesis{Hershkovitz:thesis,
  author =       "Shany Hershkovitz",
  title =        "Harnessing Evolutionary Programming for Impedance
                 Spectroscopy Analysis",
  school =       "Department of Chemical Engineering, Technion",
  year =         "2011",
  address =      "Israel",
  keywords =     "genetic algorithms, genetic programming",
  URL =          "http://www.graduate.technion.ac.il/Theses/Abstracts.asp?Id=24411",
  abstract =     "In this research, a novel analysis technique for
                 impedance spectroscopy (IS) measurements is introduced
                 and applied to the investigation of symmetric cells. IS
                 is a powerful and non destructive method of
                 characterizing electrical properties of materials. The
                 analysis program is based on genetic programming (GP)
                 which is an evolutionary-based optimization algorithm.
                 The GP computing approach allows the evolutions of both
                 the model and the numerical parameters of a certain
                 model based on its fitness to a general mathematical
                 problem. In contrast to the conventional analysis
                 methods used for impedance spectroscopy measurements,
                 e.g. equivalent circuits, our program seeks the
                 distribution of relaxation times, DFRT, that has the
                 form of a peak or a sum of several peaks, assuming the
                 Debye kernel. Using this method one finds a functional
                 (parametric) form of the distribution of relaxation
                 times. By finding a functional form of the DFRT, one
                 may develop a physical model and examine its
                 behavior.

                 This analysis technique is used to investigate the
                 oxygen reduction reaction at the cathode side of solid
                 oxide fuel cells (SOFC). Two symmetric cell
                 configurations (SCC) where chosen : (i) The first
                 configuration is composed of Pt│GDC│Pt, where the
                 Pt layer serves as cathode material as well as current
                 collector; GDC is the electrolyte material. (ii) The
                 Second configuration is composed of
                 Pt│LSCF│GDC│LSCF│Pt, where LSCF serves as the
                 electrode material. IS measurements combined with I-V
                 measurements were employed on several samples at
                 several temperatures and several oxygen partial
                 pressures in order to investigate their influence on
                 the oxygen reduction reaction.

                 The resulting IS data was analyzed using the ISGP
                 program and the resulting peaks constructing the DFRTs
                 were assigned for different processes that occur at the
                 cathode side. The activation energies as well as the
                 dependence of the processes on the oxygen partial
                 pressure were also evaluated. The polarization curves
                 obtained were analyzed using the Butler-Volmer (B-V)
                 relations and a proposed model was suggested for the
                 behavior of the examined cell.",
  notes =        "March 2017: Access is available only to users in the
                 Technion Campus premises. Supervisors Tsur Yoed and
                 Sioma Baltianski",
}

Genetic Programming entries for Shani Herskovici

Citations