dielectric

(redirected from Dielectric medium)
Also found in: Dictionary, Thesaurus, Medical.
Related to Dielectric medium: dielectric constant, polarization, permittivity

dielectric

(dī'ĭlĕk`trĭk), material that does not conduct electricity readily, i.e., an insulator (see insulationinsulation
, use of materials or devices to inhibit or prevent the conduction of heat or of electricity. Common heat insulators are, fur, feathers, fiberglass, cellulose fibers, stone, wood, and wool; all are poor conductors of heat.
..... Click the link for more information.
). A good dielectric should also have other properties: It must resist breakdown under high voltages; it should not itself draw appreciable power from the circuit; it must have reasonable physical stability; and none of its characteristics should vary much over a fairly wide temperature range. One important application of dielectrics is as the material separating the plates of a capacitorcapacitor
or condenser,
device for the storage of electric charge. Simple capacitors consist of two plates made of an electrically conducting material (e.g., a metal) and separated by a nonconducting material or dielectric (e.g.
..... Click the link for more information.
. A capacitor with plates of a given area will vary in its ability to store electric charge depending on the material separating the plates. On the basis of this variation each insulating material can be assigned a dielectric constant. Generally, the dielectric constant of air is defined as 1 and other dielectric constants are determined with reference to it. Other properties of interest in a dielectric are dielectric strength, a measure of the maximum voltage it can sustain without significant conduction, and the degree to which it is free from power losses.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

dielectric

[‚dī·ə′lek·trik]
(materials)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

dielectric

1. a substance or medium that can sustain a static electric field within it
2. a substance or body of very low electrical conductivity; insulator
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

dielectric

An insulator (glass, rubber, plastic, etc.). Dielectric materials can be made to hold an electrostatic charge, but current cannot flow through them.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
5 presented in the Tables 6 and 7, it is observed that the W-PEDD process produces higher MRR and surface quality than conventional EDD process without adding powder particles into the dielectric medium.
Caption: Figure 1: (a) Schematic of the ML-UR structure: 2D square array of stacked U-rings in a dielectric medium. (b) The unit cell of the infinite design.
13 at the SCSRs' resonant frequency of 2.1 GH, when dielectric medium ([[epsilon].sub.r] = 3.48, tan [delta] = 0.002) is used.
The above triple integration is effectuated over the whole volume of the dielectric medium; consequently, the main mathematical difficulty comes from the limiting conditions imposed on the interdependent lower boundaries of integration (x[degrees], y[degrees], z[degrees]) defining the finite surface region surrounding the volume from which the dielectric medium must be excluded.
Before entering deep in the subject of this paper, we briefly intend to recall to the mind of the reader the weak formulation of Maxwell's equations with Galerkin's method of the weighted residuals, that we use to simulate with COMSOL whispering gallery modes in a general axisymmetric dielectric medium with permittivity tensor [epsilon].
Thus the knowing the values of wavelength in dielectric medium [[lambda].sub.d], free space wavelength (X0) cut off wavelength ([[lambda].sub.c]), waveguide wavelength ([[lambda].sub.g]) and molar polarization ([P.sub.12]), were determined by Surber relations [10, 19-21]
Typical field solution can be expressed as E(x, z) = E(x)ei^z and using this in Equation (2), we can write the above equation both regions: inhomogeneous plasma layer and dielectric medium in the nth unit cell as:
Effective permittivity of artificial material composed of metal balls periodically embedded in a host dielectric medium in 3 dimensional spaces has been calculated and verified by simulation.
The Physical Origin of the Fresnel Drag of Light by a Moving Dielectric Medium. European Physics Journal B, 2005, v.
The opening chapters explain methods for evaluating the solvent effects on the molecular solutes by introducing a set of apparent surface charges representing the polarization of the dielectric medium. Many of the contributions apply continuum solvation models to the calculation of molecular properties, classical molecular dynamics simulations, layered and hybrid methods, and spectroscopic features of molecular solutes in different environments of increasing complexity.
In a dielectric medium (air) [sigma] = 0 (medium with no losses):