Results 281 to 290 of about 117,217 (324)
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Polarization Effects of Fluorine on the Relative Permittivity in Polyimides
Macromolecules, 1994The effect of fluorine incorporation on dielectric properties has been studied for a series of polyimides in order to distinguish between several contributing mechanisms to the generally observed decrease in the relative permittivity. Using low-frequency capacitance measurements after exhaustive in situ drying, in conjunction with refractive index ...
G. Hougham +3 more
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A Review of Empirical Methods to Estimate Relative Permittivity
2018 17th International Conference on Ground Penetrating Radar (GPR), 2018Four empirical models to estimate the relative permittivity of soil are tested based on a new database of relative permittivity measurements on soils. The selected models are Topp et. al. CRIM, SMDM, and GRMDM. The new database of relative permittivity measurements consists of 124 measurements on five different soils measured at a range of porosities ...
A. J. Rubin, C.L. Ho
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Relative complex permittivity and its dependence on frequency
World Journal of Engineering, 2017Purpose This paper aims to give a brief overview of dielectric properties, relative complex permittivity and its dependence on frequency. The significance of different approaches to complex permittivity is also discussed. Design/methodology/approach The different mechanisms of polarization are then presented.
Giannoukos, Georgios +2 more
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Modelling the relative permittivity of anisotropic insulating composites
Composites Science and Technology, 2011Three models have been developed for predicting the dielectric permittivity of insulating composites with inclusions of different lengths (from nm and larger) and different shapes. Firstly, for approximately periodic materials, a finite element model based on a smallest repeating box method was used in order to mimic frameworks with fibres, crystals ...
F. Nilsson, U.W. Gedde, M.S. Hedenqvist
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The relative permittivity transition in solid camphor
Journal of Physics C: Solid State Physics, 1972Three-terminal measurements of capacitance and dissipation factor have been made on samples of d-camphor, dl-camphor and l-camphor at frequencies between 200 Hz and 10 kHz over the temperature range -196 degrees C to +20 degrees C. The dielectric relaxation processes in d-camphor, below the transition temperature, have been studied and the change in ...
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Equations for Complex Relative Permittivity of Saline Water
IETE Technical Review, 1988Equations 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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The Contemporary Definition of Complex Relative Permittivity
Journal of ASTM International, 2008Abstract 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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Study of Dielectric Media with Relatively High Permittivity
Colloid Journal, 2001The electrophysical characteristics of composite media consisting of finely dispersed T-10 000 ferroelectric ceramics and dielectric fluids are experimentally investigated. Transformer oil, dibutyl phthalate, cyclohexanol, and sulfolane are used as dielectric fluids. The permittivity of compositions e is directly proportional to that of the fluids. Its
E. M. Belokurov +7 more
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Determining the relative permittivity of masses in the human body
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012This paper introduces a new method for in-vivo determination of the dielectric properties for embedded regions in human tissues. A surgery-free method is proposed for on-body monitoring system to evaluate the dielectric properties of internal body components (lung, heart etc) and to effectively determine irregularities in real-time.
Safa Salman +2 more
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Relative Permittivity of Polar Liquids. Comparison of Theory, Experiment, and Simulation
The Journal of Physical Chemistry B, 2005A molecular-based second-order perturbation theory is applied to calculate the relative permittivity of polar liquids. Our basic model is the dipolar hard sphere fluid. The main purpose of this work is to propose various approaches to take into account the molecular polarizability.
Mónika, Valiskó, Dezso, Boda
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