Results 121 to 130 of about 70,126 (153)

A nonlinear Cole–Cole model for large-amplitude electrochemical impedance spectroscopy

Chemical Engineering Science, 2015
Abstract Electrochemical impedance spectroscopy (EIS) is increasingly used to monitor the behavior of electrochemical processes. Commonly, EIS is driven by an input signal comprised of a small-amplitude sinusoidal wave superimposed on a constant dc potential (i.e., potentiostatic) to facilitate its analysis through a linearization methods. However,
C. Hernandez-Jaimes, J. Vazquez-Arenas, J. Vernon-Carter, J. Alvarez-Ramirez   +3 more
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The Cole‐Cole model in time domain induced polarization

GEOPHYSICS, 1981
Recently Pelton et al. (1978) used a Cole‐Cole relaxation model to simulate the transient voltages that are observed during an induced‐polarization survey. These authors took the impedance of the equivalent circuit Z(ω) to be [Formula: see text]They then gave the expression for the transient voltage [Formula: see text] as [Formula: see text]In ...
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Microwave tomographic image improvement by fitting to a Cole-Cole relaxation model

2017 11th European Conference on Antennas and Propagation (EUCAP), 2017
We have reconstructed microwave tomographic images of the Supelec breast phantom using our imaging fixture in combination with a multi-channel vector network analyzer. During this study we were able to recover images without the support of a priori information over a broad frequency range — 1100–1900 MHz.
Tomas Rydholm, Andreas Fhager, Mikael Persson, Paul M. Meaney   +3 more
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Extracting single dispersion Cole–Cole impedance model parameters using an integrator setup

Analog Integrated Circuits and Signal Processing, 2011
In this letter, we report an integrator-based setup to extract the four parameters that characterize a single-dispersion Cole---Cole impedance model without direct measurement of the complex impedance. Experimental results in the range 100 Hz---1 MHz using apple and plumb fruits are given and results are compared with numerical simulations of the ...
B. Maundy, A. S. Elwakil
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A biosensor model based on multivariate regression of corrected Cole-Cole parameters

2011 4th International Congress on Image and Signal Processing, 2011
Rapid-response biosensing systems are necessary to counteract threats due to high-consequence pathogens. A impedance immunosensor for E. coli O157∶H7 detection was developed based on multi-frequency electrical impedance scanning, screen-printed microelectrodes, and lateral-flow chromatographic assay.
Haiyun Wu, Yueming Zuo, Fengchan Wei, Chuanjin Cui, Song Huang, Mingju Zhao, Jinmiao Ji   +6 more
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Approximation of Grünwald–Letnikov Fractional Derivative for FDTD Modeling of Cole–Cole Media

IEEE Transactions on Magnetics, 2014
A finite-difference time-domain (FDTD) method for modeling wave propagation in dispersive Cole-Cole media is proposed. The main difficulty in time-domain modeling of a Cole-Cole medium is that the polarization relation that describes its electromagnetic behavior is a differential equation of fractional order. By definition, the fractional derivative of
Ioannis T. Rekanos, Traianos V. Yioultsis   +1 more
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FDTD Modeling of Wave Propagation in Cole-Cole Media With Multiple Relaxation Times

IEEE Antennas and Wireless Propagation Letters, 2010
A finite-difference time-domain (FDTD) method for simulating wave propagation in Cole-Cole dispersive media with multiple relaxation times is presented. The main difficulty that the proposed method circumvents is the presence of fractional derivatives in the time-domain representation of the polarization relation. The latter is approximated by a set of
Ioannis T. Rekanos, Theseus G. Papadopoulos   +1 more
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Variation of Cole-Cole model parameters with the complex permittivity of biological tissues

2009 IEEE MTT-S International Microwave Symposium Digest, 2009
Cole-Cole relaxation models have been widely used by researchers to extrapolate the measured permittivity of biological tissues to higher frequencies. There is much variability of the measured permittivity from one sample to another for the same type of tissue requiring different Cole-Cole fitting parameters.
Tarek Said, Vasundara V. Varadan
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Evaluation of electrode-tissue contact using multifrequency impedance analysis and Cole-Cole model fitting

Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Atrial fibrillation (AF) is a common cardiac arrhythmia, and ablation is the primary treatment for patients with drug intolerance. The success of AF ablation depends on the adhesion of the catheter to the tissue. Existing electrical coupling index (ECI) and electrode-interface resistance (IR) methods based on impedance measurement to ...
Mengying Zhan, Haitao Yao, Qijun Xie, Yingxi Wang, Yu Zhou   +4 more
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Restrictions on the use of Cole‐Cole dispersion models in complex resistivity interpretation

GEOPHYSICS, 1981
The Cole‐Cole dispersion approximates the behavior of inductive coupling over only a part of the frequency range. We show that the interaction between the induced polarization (IP) and inductive coupling (IC) effects will, in general, be more complicated than a multiplication of two Cole‐Cole dispersions representing the separate IP and IC effects ...
J. Major, J. Silic
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