Results 251 to 260 of about 117,634 (287)

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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Wideband Relative Permittivity Characterization of Thin Low Permittivity Textile Materials Based on Ridge Gap Waveguides

IEEE Transactions on Microwave Theory and Techniques, 2016
Medical applications and wearable antennas need accurate electrical characterization of textile material. Many techniques have been presented before to obtain the dielectric constant of any material and some of these techniques are applied on textile materials.
Shoukry I. Shams, Muhammad M. Tahseen, Ahmed A. Kishk   +2 more
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Relative Permittivity Variation Surrounding PCB Via Hole Structures

2008 12th IEEE Workshop on Signal Propagation on Interconnects, 2008
As integrated circuit technology advancements are pushing data rates to 6 Gb/s and beyond, channel simulations are becoming a necessity. As part of the topology modeling and simulation, the correct value of permittivity surrounding a printed circuit board (PCB) via hole structure is required for better accuracy.
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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
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Double-layer studies in solutions of low relative permittivity

Journal of the Chemical Society, Faraday Transactions, 1997
The capacitance of various electrolytes in dichloroethane, anisole and cyclohexane solutions are measured at a platinum electrode. It is found that specific adsorption occurs at large overpotentials from the potential of zero charge (pzc), but a diffuse-layer minimum is observed close to the pzc.
Abbott, AP, Harper, JC
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Relative permittivity and dielectric relaxation in aqueous alcohol solutions

Fluid Phase Equilibria, 1998
Abstract In this work, our objective was to study the hydrogen bonding of alcohols in aqueous solutions and alcohol dipole relaxation by measuring the complex permittivity. Alcohols chosen for study were methanol, ethanol and propanol over the full composition range and from 297–363 K. Measurements were made with a frequency domain technique from 100
R.L Smith, S.B Lee, H Komori, K Arai
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Determining the relative permittivity of deep embedded biological tissues

2013 US National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2013
Human tissue characterization, deep into the body, has been of interest for decades. X-rays are used for locating tumors. However, such surgery-free identification methods fail to verify whether tumors are benign or malignant without surgical extraction and testing of sample tissue.
Safa Salman, John L. Volakis
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Relative Permittivity Measurement of 3D-textile

2016
The paper deals with the relative permittivity determination of the 3D-textile by a transmission line method (TLM). Measuring points are shifted to avoid inaccuracies caused by transitions between a coaxial cable and a microstrip line. A substrate where the microstrip line is designed is composed of three layers where one layer (3D-textile) has unknown
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