Results 251 to 260 of about 13,906 (295)

Equations for Complex Relative Permittivity of Saline Water

IETE Technical Review, 1988
Equations hare been presented to calculate the complex relative permittivity of saline water as a function of salt content and temperature of water. The results obtained from these equations show good agreement with the published measured data.
Shushil K Aggarwal, R H Johnston
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A new measurement technique for obtaining the complex relative permittivity of terrain surfaces

IEEE Transactions on Geoscience and Remote Sensing, 2002
A new method for measuring the effective complex relative permittivity of a reflecting surface is presented. The approach is based on the two-ray model. We derive an equation of a circle representing the complex reflection coefficient which relates the incidence angle, frequency, and received power from the path gain using the two-ray model.
Heung-Soo Kim, Ram M. Narayanan
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Relative permittivity and electrical conductivity of some divalent metal alginate complexes

Materials Letters, 1997
Abstract The influence of a frequency on the relative permittivity e ′ Γ as well as the AC conductivity of metal alginate complexes (Ba 2+ , Sr 2+ , Pb 2+ , Cd 2+ or Zn 2+ ions) as a function of temperature has been investigated.The average values of the activation energy obtained from the experimental data indicate that the electrical ...
S.M.Abdel Wahab, M.A. Ahmed, F.A. Radwan, R.M. Hassan, A.M. El-Refae   +4 more
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The Contemporary Definition of Complex Relative Permittivity

Journal of ASTM International, 2008
Abstract ASTM D150 [Standard Test Methods for AC Loss Characteristic and Permittivity (Dielectric Constant) of Solid Electrical Insulation, 2004] is the standard for measurement of alternating current (AC). Aimed at an analysis of this standard and proceeding from the information transmission characteristic of the dielectric, the ...
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Effect of metal and halogen ions on the relative permittivity of some diamine complexes

Physica Scripta, 1997
The real part of the relative permittivity e'r as well as the dielectric loss as represented by e''r for the compounds (CH2)n(NH3)2MCl4−xBrx (where x = 0, 2, n = 2, 3 and M = Cu, Co) have been measured. The measurements were carried out as a function of temperature and frequency. Both e'r and e''r show the same relaxation phenomena which involves large
M A Ahmed, A M Ibrahim, S M Abdel Wahab, F A Radwan   +3 more
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Complex relative permittivity analysis for monitoring watermelon

2017 International Symposium on Antennas and Propagation (ISAP), 2017
This paper proposes a study of complex relative permittivity (∊ r =∊ r ′-j∊ r ″) for monitoring watermelon. The complex relative permittivity of peel and pulp are analyzed as variation of maturity stages and used for determining mature fruit of watermelon from the measured reflection coefficient.
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Effect of porosity, pore size and permeability on the complex relative permittivity of sandstone

2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), 2017
The measurement of the frequency dependences of the complex relative permittivity (CRP) of fully or partially saturated with distilled water rocks with different petrophysical characteristics is carried out. NMR relaxometer is used to determine the rocks pore size and porosity.
A. V. Repin, O. V. Rodionov, M. Y. Shumskayte   +2 more
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Complex effective relative permittivity of soil samples from the taunus region (Germany)

Journal of Earth Science, 2010
The most important parameter affecting ground-penetrating radar (GPR) measurements is the complex effective relative permittivity ɛr,eff* because it controls the propagation velocity and the reflection of GPR pulses. Knowing ɛr,eff* of soils passed through by electromagnetic waves increases accuracy in soil thickness and interface identification ...
Katja Lauer, Christian Albrecht, Christina Salat, Peter Felix-Henningsen   +3 more
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Measurement of the complex relative permittivity frequency characteristics of the body using pulse—reflection

Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 1990
AbstractFrom the measurement of a reflected voltage waveform from a biological body for a step‐like voltage waveform, the frequency characteristics of the complex relative permittivity are studied and the following results are obtained: (1) if the blood flow and sweating are normal, the value of tanδ in the mouth is 4 ‐ 6 at about 10 MHz because ...
Tsunehito Higashi, Khoshi Ishihara
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Spectroscopic Studies of the Complexation of Iodine with Antihistamine Drugs in Solvents of Varying Relative Permittivity

Journal of Solution Chemistry, 2012
The interaction of oxatomide (OXA), azacyclonol (AZA) and chloropheniramine (ClPA) antihistamine drugs with iodine was studied spectrophotometrically in different solvents and at three different temperatures. The electronic, FT-IR, far-IR, and mass spectra of the resulting charge-transfer (CT) complexes were recorded, in addition to thermal analysis ...
M. Pandeeswaran, E. H. El-Mossalamy, K. P. Elango   +2 more
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