Results 281 to 290 of about 118,060 (323)

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 ...
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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
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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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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
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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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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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Relative Permittivity Measurement using the Polarization Z-Meter

2006 16th International Crimean Microwave and Telecommunication Technology, 2006
The method of measurement of the relative permittivity of a metal-dielectric strip waveguide (MDSW) material by means of the circular polarization coupler (CPC) based Z-meter is presented.
S. Berdyshev, V. Salamatin
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Variation of the relative permittivity of charged dielectrics

Applied Physics Letters, 1998
The variation of the relative permittivity of charged dielectrics with trapped charge density has been investigated by a time-resolved current method, in conjunction with a mirror image method employing a scanning electron microscope. The calculation is made by a mathematical expression derived from classical electromagnetic theory.
Ong, C.K., Song, Z.G., Oh, K.H., Gong, H., Le Gressus, C.   +4 more
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Relative Permittivity Measurements of Carbon Dioxide + Ethanol Mixtures

Journal of Chemical & Engineering Data, 2011
The relative permittivities (er) of carbon dioxide (CO2) + ethanol mixtures (0.050, 0.100, 0.152, and 0.212 mass fractions of ethanol) were measured at (303 to 333) K in the pressure range (7.2 to 30.8) MPa using a direct capacitance method.
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Relative Permittivity Assessment of Oil-Impregnated Cellulose Insulation

2020
Insulating system of a power transformer consists of an insulating liquid (mineral oil or ester liquid) and cellulose-based materials (paper and pressboard). Dielectric properties of an insulating material may be expressed in terms of relative permittivity and material conductivity. Material conductivity influences electric fields in power transformers
Mladen Marković, Marijana Majić Renjo
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