By Gorur Govinda Raju
Examines the impacts of electrical fields on dielectric fabrics and explores their specific habit via good tested ideas of physics and engineering in fresh literature on dielectrics.
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Extra info for Dielectrics in Electric Fields
The field intensification factor depends upon the ratio h/r where h is the height and r the radius of the projection. Experimentally observed values of P can be ashighaslOOO 9 . Recent measurements on electron emission in a vacuum have been carried out by Juttner et. 10' n with a time resolution of 100 ns and the vacuum gap exposed to a second gap in which high current arcing ~15A occurs. Higher emission currents are observed with a time constant of 1-3 us and mechanical shocks are also observed to increase emission.
12) E3 may be calculated by considering a small element of area dA on the surface of the cavity (Fig. 3). Let 0 be the angle between the direction of E and the charge density Pn . , = Pcos<9 TM Copyright n 2003 by Marcel Dekker, Inc. All Rights Reserved. 13) Chapter 2 44 E Fig. 3 Calculation of the internal field in a dielectric. 15) We are interested in finding the field which is parallel to the applied field. 16) All surface elements making an angle 9 with the direction of E give rise to the same dE3.
11 Band-gap model and trapping events. C: conduction band, V: valence band, F-F: dark Fermi level, A-A: electron Fermi level (under photo-excitation), B-B: hole Fermi level (under photo-excitation), E: shallow electron traps, H: shallow hole traps, G: ground states (retrapping centers, deep traps), 1: photoexcitation of molecule; hole is captured in neutral shallow trap; electron is lifted to conduction band and captured in shallow electron trap; 2: shallow trapped electron is thermally activated into the conduction band, recombines into ground state; 3-shallow trapped electron, thermally activated into conduction band, is captured by deep trap; 4-4-shallow trapped hole receives electron from valence band and recombines into ground state; 5: shallow trapped hole receives electron from ground state and is captured in deep trap.