Department Seminars Summer 2008Usually 12:30 p.m. Tues., EE125 |
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Date & Speaker |
Topic |
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| June 6*: Anupama Sadasiva | An Analysis of the Role of Water on the Effective Permittivity of Biological Materials Using Mixing Formulas | |
| * Room and/or time different from the usual | ||
An Analysis of the Role of Water on the Effective Permittivity of Biological Materials Using Mixing Formulas
2:00 p.m. Friday, June 6, 2008
in EE 125
by
Anupama Sadasiva
,
NDSU
Fargo. ND
Abstract
The literature on the permittivity of biological materials shows discrepancies in the values reported by various sources. The effective permittivity of biological materials is dependent on its constituent materials. In this study, mixing formulas are reviewed and used to investigate the role of water content and state on the effective permittivity of biological materials. White matter, gray matter, muscle, skin and liver are used as examples of biological materials and their permittivity values are determined using the Maxwell-Garnet mixing formula for variations in water levels over a physiological range. The results show that the discrepancies found in literature can, to a great extent, be accounted for by the variations in water volume levels. Further, correcting for the presence of bound water, a wider range of permittivity values is achieved due to the low permittivity of bound water. All such changes are also shown to be maintained over a wide frequency range.
This study provides deeper insight into the effect of water content and state on biological materials. Researchers can benefit from this work by accounting for water content and state when modeling biological materials and assessing the effects of electromagnetic fields.
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