Results 241 to 250 of about 121,407 (297)
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Journal of the Less Common Metals, 1979
Abstract The temperature dependence of the dielectric loss (tgδ) in β-B was studied at temperatures ranging from −196 to 350 °C and at frequencies of 1–104 Hz. The curve of the temperature dependence of dielectric loss in an electric field with a frequency of 50 Hz showed two relaxation maxima at −65 and −45 °C characterized by activation energies of
F.N. Tavadze +4 more
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Abstract The temperature dependence of the dielectric loss (tgδ) in β-B was studied at temperatures ranging from −196 to 350 °C and at frequencies of 1–104 Hz. The curve of the temperature dependence of dielectric loss in an electric field with a frequency of 50 Hz showed two relaxation maxima at −65 and −45 °C characterized by activation energies of
F.N. Tavadze +4 more
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The Dielectric Losses in Impregnated Paper
Transactions of the American Institute of Electrical Engineers, 1933Accurate measurements have been made of the electrical and other physical properties of 10 insulating oils, of a single grade of wood pulp paper, and of the paper when impregnated with each of the oils. Short time charge and discharge curves under continuous potential have thrown further light on the anomalous conduction as found in oils, and permit ...
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Dielectric Loss of Polymer Nanocomposites and How to Keep the Dielectric Loss Low
2016An efficient utilization of polymer nanocomposites as dielectrics requires a comprehensive knowledge of the dielectric loss behavior in a time-varying field to avoid unnecessary energy loss and insulation failure due to thermal instability. It was indicated that losses from the molecular dipole relaxation and the charge carrier propagation predominate ...
Yanhui Huang, Xingyi Huang
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Limiting losses in dielectrics
IEEE Transactions on Dielectrics and Electrical Insulation, 2001Examination of a wide range of experimental data relating to 'low-loss' dielectric materials reveals the little acknowledged fact that their loss at high frequencies (kHz to GHz) and low temperatures (typically 100 to 200 K) is weakly or very weakly dependent on frequency, what we call 'flat loss', and is likewise weakly dependent on temperature ...
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On the Theory of Dielectric Loss
Physical Review, 1941When a sinusoidal voltage is applied to a condenser containing an absorptive dielectric the absorption current can be split up into two components, one in phase and another in quadrature with the voltage. In the present paper, direct relations, suitable for numerical calculation, are established between these components, and a general relationship ...
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Dielectric nanocomposite with high dielectric permittivity and low dielectric loss
2015 IEEE Electrical Insulation Conference (EIC), 2015Dielectric flexible nanocomposites featuring ferroelectric barium titanate nanoparticles embedded in poly(vinylidene fluoride) (PVDF) matrix were fabricated by a miscible-immiscible coagulation method followed by hot pressing. The SEM images showed good distribution of nanoparticles with very little particle agglomeration.
Youngho Jin +2 more
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Dielectric Loss Mechanism in Rutile (TiO2)
Journal of Applied Physics, 1972A new mechanism to account for the anomalously large dielectric loss and apparent dielectric constant frequently observed in TiO2 is presented, which appears to agree well with experiment. The mechanism involves field-induced donor migration where the field arises from a difference in work function between the rutile and a metal electrode.
Johnson, O. W. +2 more
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The quadrant electrometer for the measurement of dielectric loss
Journal of the A.I.E.E., 1924Walker, Skinner, Addenbrooke, Rayner, Orlich, Schultze, Thielers and others* have given a great amount of useful information on electrometers for the measurement of dielectric loss. We have found instruments made somewhat after the design of Skinner and Rayner, so rugged, and so useful as laboratory instruments, even when the instrument is subjected to
D. M. Simons, W. S. Brown
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Journal of Materials Science, 1999
Low-loss dielectrics are important technologically as insulators but there is little understanding of the physical causes of this property and even their spectral response is not well documented—this study has revealed a number of different types of behaviour which do not appear to have been recognised previously. Most low-loss materials show a “flat”,
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Low-loss dielectrics are important technologically as insulators but there is little understanding of the physical causes of this property and even their spectral response is not well documented—this study has revealed a number of different types of behaviour which do not appear to have been recognised previously. Most low-loss materials show a “flat”,
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Loss Mechanisms in Dielectric-Loaded Resonators
IEEE Transactions on Microwave Theory and Techniques, 1985Analysis is presented of resonators consisting of a section of a dielectric-loaded waveguide shorted at both ends. The analysis includes resonant frequency calculations, mode charts, and unloaded Q computations. Numerical results are presented for the unloaded Q's of various modes, as a function of the resonator parameters.
K.A. Zaki, C. Chen
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