Results 251 to 260 of about 26,456 (298)

Electrical conductivity and relative permittivity of KHCO3

Physica Status Solidi (a), 1994
The electrical conductivity σ and the relative permittivity (κ) as function of temperature 300 K < T < 400 K are measured and presented for potassium hydrogen carbonate KHCO3. It seems likely that the compound undergoes tow structural phase transitions at ≈ 318 and ≈ 365 K.
M. M. Abdel-Kader, M. Fadly, M. Abu Taleb, K. Eldehamy, A. I. Ali   +4 more
openaire   +1 more source

Relative permittivity detector for cable insulators

PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409), 2002
This paper presents a new measurement technique of relative permittivity (/spl epsi//sub r/) for cable insulators. The travelling wave and reflection wave theory are applied to generate low voltage pulse signal feeding cable lines that need to know /spl epsi//sub r/ of insulators.
P. Kerdonfag, S. Potivejkul, S. Jamnian, V. Kinnares   +3 more
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A Review of Empirical Methods to Estimate Relative Permittivity

2018 17th International Conference on Ground Penetrating Radar (GPR), 2018
Four 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
openaire   +1 more source

Polarization Effects of Fluorine on the Relative Permittivity in Polyimides

Macromolecules, 1994
The 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, G. Tesoro, A. Viehbeck, J. D. Chapple-Sokol   +3 more
openaire   +1 more source

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 ...
openaire   +1 more source

Determining the relative permittivity of masses in the human body

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
This 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, Dimitris Psychoudakis, John L. Volakis   +2 more
openaire   +1 more source

The relative permittivity transition in solid camphor

Journal of Physics C: Solid State Physics, 1972
Three-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 ...
openaire   +1 more source

Study of Dielectric Media with Relatively High Permittivity

Colloid Journal, 2001
The 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, A. S. Klepikov, V. M. Kopylov, S. M. Korobeinikov, I. T. Ovchinnikov, S. G. Sarin, K. V. Yanshin, E. V. Yanshin   +7 more
openaire   +1 more source

Modelling the relative permittivity of anisotropic insulating composites

Composites Science and Technology, 2011
Three 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
openaire   +1 more source

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
openaire   +1 more source