Results 251 to 260 of about 24,613 (311)
Some of the next articles are maybe not open access.
Measurement of Dielectric Loss and Wall Loss in a Dielectric-Filled Waveguide
IEEE Transactions on Instrumentation and Measurement, 1974A waveguide bridge capable of measuring dielectric loss down to 5 ?rad at frequencies of 10-35 GHz is described. A major uncertainty was the value of the wall loss. This has been resolved by measuring the wall loss of the specimen arm both with air and dielectric filling.
Sheila Ayers, D. Marr, A. E. Parker
openaire +1 more source
Ferroelectrics, 1985
The theory of intrinsic (phonon) dielectric losses in ferroelectrics of displacive type is reviewed and compared with the theory of losses in ordinary dielectrics. The authors in 7-12 have calculated the temperature and frequency dependence of losses for a wide range of variation of the parameters.
V. L. Gurevich, A. K. Tagantsev
openaire +1 more source
The theory of intrinsic (phonon) dielectric losses in ferroelectrics of displacive type is reviewed and compared with the theory of losses in ordinary dielectrics. The authors in 7-12 have calculated the temperature and frequency dependence of losses for a wide range of variation of the parameters.
V. L. Gurevich, A. K. Tagantsev
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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 ...
openaire +1 more source
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 ...
openaire +1 more source
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 ...
openaire +1 more source
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
openaire +1 more source