Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By V. M. Serdyuk

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A phenomenological theoretical model of grain dielectric properties is presented for radio and microwave frequencies. On the bases of this model, an inverse problem is solved to determine the dielectric permittivity of bound water inside kernels of winter wheat using results of complex permittivity measurements for bulk grain carried out by other authors. The character of the water complex permittivity dependence on frequency and kernel moisture content is studied. For this, the permittivity was considered as a sum of five different functions, depending on moisture content explicitly, and with coefficients being subject to determination. The frequency dependence of these coefficients was analyzed, and the regions typical for the ionic conductivity and for the dipole-orientational polarization mechanism were detected. For this polarization mechanism, the relaxation frequencies are differ from those of free water. It was concluded that water microparticles inside kernels are formed not by pure water, but by aqueous solution of four different substances coming from the kernel solid phase. It is shown that bound water, for the most part, is in a state that is intermediate between that of free water and that of molecules in the monomolecular water layer on the solid phase boundary.

V. M. Serdyuk, "Dielectric Study of Bound Water in Grain at Radio and Microwave Frequencies," Progress In Electromagnetics Research, Vol. 84, 379-406, 2008.

1. Kupfer, K., "Methods of density-independent moisture measurement," Electromagnetic Aquametry: Electromagnetic Wave Interaction with Water and Moist Substances, 135-168, 2005.

2. Lonappan, A., V. Thomas, G. Bindu, C. Rajasekaran, and K. T. Mathew, "Nondestructive measurement of human blood at microwave frequencies," J. ofEle ctromagn. Waves and Appl., Vol. 21, No. 8, 1131-1139, 2007.

3. Trabelsi, S., A. W. Kraszewski, and S. O. Nelson, "Universal calibration method for microwave moisture sensing in granular materials," Trans. Amer. Soc. Agric. Eng., Vol. 44, No. 3, 731-736, 2001.

4. Nelson, S. O. and S. Trabelsi, "Permittivity measurements and agricultural applications," Electromagnetic Aquametry: Electromagnetic Wave Interaction with Water and Moist Substances, 419-442, 2005.

5. Pissis, P., "Water in polymers and biopolymers studied by dielectric techniques," Electromagnetic Aquametry: Electromagnetic Wave Interaction with Water and Moist Substances, 39-70, 2005.

6. Vandermeulen, D. and N. Ressler, "A near-infrared analysis of water-macromolecule interactions. Hydration and the spectra of aqueous solutions of intact proteins," Arch. Biochem. and Biophys, Vol. 199, No. 1, 197-205, 1980.

7. Huhnerfuss, H. and W. Alpers, "Molecular aspects of the system water/monomolecular surface film and the occurrence of a new anomalous dispersion regime at 1.43 GHz," J. Phys. Chem., Vol. 83, No. 25, 5251-5258, 1983.

8. Mashimo, S., S. Kuwabara, S. Yagihara, and K. Higasi, "Dielectric relaxation time and structure of bound water in biological materials," J. Phys. Chem., Vol. 91, No. 25, 6337-6338, 1987.

9. Tao, N. J., S. M. Lindsay, and A. Rupprecht, "Structure of DNA hydration shells studied by Raman spectroscopy," Biopolymers, Vol. 28, No. 5, 1019-1030, 1989.

10. Brandelik, A. and G. Krafft, "Measurement of bound and free water in mixtures," Microwave Aquametry, 101-109, 1996.

11. Yagihara, S., M. Oyama, A. Inoue, M. Asano, S. Sudo, and N. Shinyashiki, "Dielectric relaxation measurement and analysis of restricted water structure in rice kernels," Measur. Sci. Technol., Vol. 18, No. 4, 983-990, 2007.

12. Jones, S. B. and D. Or, "Thermal and geometrical effects on bulkp ermittivity of porous mixtures containing bound water," Electromagnetic Aquametry: Electromagnetic Wave Interaction with Water and Moist Substances, 71-92, 2005.

13. Stacheder, M., C. Huebner, S. Schlaeger, and A. Brandelik, "Combined TDR and low-frequency permittivity measurements for continuous snow wetness and snow density determination," Electromagnetic Aquametry: Electromagnetic Wave Interaction with Water and Moist Substances, 367-382, 2005.

14. Ulaby, F. T., R. K. Moore, and A. K. Fung, "Microwave dielectric properties of natural earth materials," Microwave Remote Sensing, Vol. III, 2017-2027, 1986.

15. Nelson, S. O. and L. Stetson, "Frequency and moisture dependence of the dielectric properties of hard red winter wheat," J. Agric. Eng. Res., Vol. 21, 181-192, 1976.

16. Koledintseva, M. Y., S. K. R. Chandra, R. E. DuBroff, and R. W. Schwartz, "Modeling of dielectric mixtures containing conducting inclusions with statistically distributed aspect ratio," Progress In Electromagnetics Research, Vol. 66, 213-228, 2006.

17. Koledintseva, M. Y., R. E. DuBroff, R. W. Schwartz, and J. L. Drewniak, "Double statistical distribution of conductivity and aspect ratio of inclusions in dielectric mixtures at microwave frequencies," Progress In Electromagnetics Research, Vol. 77, 193-214, 2007.

18. Yang, D. K., X. Y. Hu, S. Y. Zhang, and M. Dai, "Numerical high frequency," PIERS Online, Vol. 3, No. 4, 457-461, 2007.

19. Wang, H. G., C. H. Chan, L. Tsang, and K. F. Chan, "Mixture effective permittivity simulation using IMLMQRF method of preconditioned EFIE," Progress In Electromagnetics Research, Vol. 57, 285-310, 2006.

20. Sun, X. M., Y. P. Han, and H. H. Wang, "Near-infrared light scattering by ice-water mixed clouds," Progress In Electromagnetics Research, Vol. 61, 133-142, 2006.

21. Li, Y. and P. Yang, "The permittivity based on electromagnetic wave attenuation for rain medium and its applications," J. of Electromagn. Waves and Appl., Vol. 20, No. 15, 2231-2238, 2006.

22. Gong, S. H. and J. Y. Huang, "Accurate analytical model of equvalent dielectric constant for rain medium," J. ofEle ctromagn. Waves and Appl., Vol. 20, No. 13, 1775-1783, 2006.

23. Bahrami, M., J. Rashed-Mohassel, and M. Mohammad-Taheri, "An exact solution of coherent wave propagation in rain medium with realistic raindrop shapes," Progress In Electromagnetics Research, Vol. 79, 107-118, 2008.

24. Van Beek, L. K. H., "Dielectric behavior of heterogeneous systems," Progress in Dielectrics, Vol. 17, 69-114, 1967.

25. Sazhin, B. I. (ed), Electrical Properties of Polymers, Chemistry Publ., 1977.

26. Sihvola, A., Electromagnetic Mixing Formulas and Applications, IEE, London, 1999.

27. Tinga, W. R., "Mixture laws and microwave-material interactions," Dielectric Properties ofHeter ogeneous Materials, 69-114, 1992.

28. Jylhä, L. and A. Sihvola, "Equation for the effective permittivity of particle-filled composites for material design applications," J. Phys. D: Appl. Phys., Vol. 40, No. 16, 4966-4973, 2007.

29. Kukharchik, P. D., V. M. Serdyuk, J. A. Titovitsky, and M. O. Purovsky, "Effect of continuous modification of dielectric order in grain," J. Phys. D: Appl. Phys., Vol. 39, No. 13, 2832-2838, 2006.

30. Kaatze, U., "Microwave dielectric properties of water," Microwave Aquametry, 37-53, 1996.

31. Kaatze, U., "Electromagnetic wave interaction with water and aqueous solutions," Electromagnetic Aquametry: Electromagnetic Wave Interaction with Water and Moist Substances, 15-37, 2005.

32. Egorov, G., "Thermodynamic interaction between grain and water," Khleboproducty, No. 2, 22-23, 2004.

33. Landau, L. D. and E. M. Lifshitz, Electrodynamics of Continuous Media, Pergamon, New York, 1960.

34. Wert, C. and R. M. Thomson, Physics of Solids, McGraw-Hill, New York, London, 1964.

35. Belyaev, B. A., N. A. Drokin, V. F. Shabanov, and V. N. Shepov, "High-frequency dielectric spectra from liquid crystals of series nCB and nOCB," Technical Physics, Vol. 47, No. 4, 470-473, 2002.

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